Metal Shredder Revolutionizing Scrap Metal Processing

2025-05-16

A metal shredder is a heavy-duty industrial machine that processes and reduces metal waste into smaller pieces. It is essential in the scrap metal recycling industry, breaking down large items like cars, appliances, and machinery into shredded fragments. These fragments are further processed for sorting, separation, and recycling into raw materials for manufacturing.

In operation, the multifunctional shredder reduces material size through shearing, tearing, and squeezing. Its structure typically includes a motor, reducer, rotating blade shaft, H13 blades, spacers, frame, base, box, and work platform. The rotating blade shaft features removable blades and spacers, with the number of blades varying by model and shaft size. The rotary cutting system offers long service life, strong cutting ability, and high production capacity.

The environmental impact of metal shredders is profound. By facilitating efficient metal recycling, these machines significantly reduce the need for virgin ore extraction, conserving natural resources and lowering carbon emissions. Furthermore, the shredded metal output serves as premium feedstock for steel mills and foundries, closing the material loop in industrial production.

From an economic perspective, metal shredders create substantial value by transforming waste into valuable commodities. The processed metal fragments command higher market prices than unprocessed scrap, while the reduced transportation costs associated with compacted materials further enhance profitability.

In short, the metal shredder stands as a cornerstone in modern scrap metal processing, embodying technological innovation and environmental stewardship. and has become an indispensable force in the circular economy.

#Shredder #Metal shredder machine #Metal recycling

Technical features of TEYUN briquetting machine

2025-05-16

1. The system is designed with a pre-unloading device to completely eliminate hydraulic shock.

2. Advanced fast devices ensure the production needs of users.

3. The electrical part adopts an imported PLC fully automatic control system with strong anti-interference ability and low failure rate.

4. The body adopts an integral steel structure with high strength and good stability, and no anchor screws are required.

5. This machine adopts hydraulic transmission, highly professional integral valve block, and ultra-large flow diameter, which reduces system pressure loss and eliminates leakage.

6. The use of cartridge valves, electro-hydraulic proportional valves and unique oil circuit design make the hydraulic system perfect. Even if it works under long-term heavy load, the system will not be unable to do its job.

#Briquetting machine #Metal chip briquette press #metal scrap briquetting press

Teyun gantry shear structure introduction

2025-05-16

Gantry Shear is a large industrial shearing equipment, mainly used in the metal processing industry, for efficient and accurate cutting of metal plates, bars, profiles, etc. Its name comes from its structural design - a frame-type rack similar to a "gantry", which has the characteristics of high stability, strong shearing force, and a wide range of applications. The following is a detailed introduction to the gantry shear

Structure and composition

1.Gantry frame: A rigid frame consisting of two side columns and a top crossbeam ensures the stability of the equipment under high load.

2.Hydraulic system: Provides shearing power, drives the blade through a hydraulic cylinder to complete the cutting, and the shearing force can reach hundreds to thousands of tons.

3.Blade: The upper blade is fixed and the lower blade is movable. The material is mostly high-strength alloy steel and can be replaced to adapt to different materials.

4.Feeding system: Some models are equipped with automatic feeding devices (such as conveyor belts or rollers) to improve efficiency.

5.Control system: PLC or CNC system controls the shearing length, speed and pressure, and supports automated operation.

#Gantry shear #scrap metal cutting machine #hydraulic gantry shear

Changyu's flagship product [Fluorine-lined, corrosion-resistant and wear-resistant mortar pump]

2025-05-16

CHANGYU's flagship product #Fluorine-lined corrosion-resistant and wear-resistant mortar pump : the ultimate anti-corrosion and wear-resistant solution in the chemical industry in the global chemical, metallurgical, environmental protection and other industries, equipment corrosion and wear problems cause economic losses of up to tens of billions of dollars each year. As a leading company in the field of anti-corrosion pumps, Changyu Pumps and Valves has successfully broken the monopoly of international brands with its independently developed fluorine-lined corrosion-resistant and wear-resistant mortar pumps, and has become the preferred solution in the fields of petrochemicals, flue gas desulfurization, and electroplating wastewater treatment.

Fluorine-lined corrosion-resistant and wear-resistant mortar pump

ⅠWhy has the fluorine-lined, #corrosion-resistant and wear-resistant mortar pump become a rigid demand in the industry?

According to Grand View Research, the global chemical pump market will reach $68.5 billion in 2023, of which #corrosion-resistant pumps account for more than 40%, with an annual growth rate of 8.3%. Traditional metal pumps generally have problems of short life and high maintenance costs when facing strong acids (such as sulfuric acid and hydrochloric acid), strong alkalis, and media containing solid particles. For example:

①: A phosphate fertilizer plant used a cast iron pump to transport slurry containing 30% phosphoric acid. The impeller was perforated in just 3 months, and the replacement cost exceeded 120,000 yuan/year;

②: The desulfurization system of a coastal power plant used a #316L stainless steel pump, which frequently shut down due to chloride ion corrosion, affecting power generation efficiency.

ⅡThe core technical advantages of CHANGYU #fluorine-lined pump

①：Quadruple protection technology, lifespan increased by 5-8 times

Lining material: modified #fluorinated ethylene propylene (FEP) material, with a thickness of 8-10mm, a temperature range of -85℃~150℃, and can withstand strong corrosive media such as 98% concentrated sulfuric acid and hydrofluoric acid (key technology for chemical pump selection);

·Wear-resistant structure: The impeller adopts a semi-open design + back auxiliary blades to reduce particle blockage; the surface hardness of the flow-through parts reaches HRC65, which is 3 times more wear-resistant than traditional rubber linings;

·Patented seal: Containerized double-end mechanical seal (API 682 standard), equipped with PLAN54 flushing system, leakage rate <0.1ml/h;

·Modular design: The pump body and bearing bracket are standardized, and the maintenance time is shortened by 70%.

②：Measured performance comparison

Measured performance comparison

Ⅲ Classic application scenarios and customer cases

①：Flue gas desulfurization system (working principle of desulfurization pump)

·Customer: A nickel smelter in Indonesia

·Working conditions: Processing desulfurization slurry containing 15% gypsum, pH=2.5, temperature 80℃

·Solution: Configure #200UHB-ZKD-350-32 fluorine-lined pump, flow rate 350m³/h, head 32m

·Effect: Continuous operation for 18 months without major repairs, energy consumption reduced by 22%, replacing the original American brand pump

②：Electroplating wastewater reuse

·Customer: A circuit board company in Guangdong

·Problem: Chromium-containing wastewater caused corrosion and leakage of 304 stainless steel pump within 3 weeks

·Renovation plan: Use CHANGYU #50UHB-ZKD-20-30 small fluorine-lined pump, equipped with #frequency conversion control

·Results: Wastewater recovery rate increased from 60% to 92%, saving more than 800,000 yuan in annual reagent costs

Ⅳ Selection Guide: How to match the best working conditions?

①: Customers should pay attention to the following when purchasing fluorine-lined pumps:

· Medium characteristics: pH value, temperature, solid content (core parameters for mortar pump selection);

· Flow head: It is recommended to reserve 10%~15% margin (refer to HI 9.6.7 specification);

· Quality certification: ISO or CE quality certification is required;

· Service support: CHANGYU provides free quotation + selection plan + model + structure diagram.

②: As of 2024, Changyu Pumps and Valves has provided more than 120,000 fluorine-lined equipment to the world, thanks to:

· Technical barriers: 17 invention patents, participated in the drafting of the national standard "#Corrosion-resistant Plastic Centrifugal Pump";

· Data verification: (mean time between failures) test up to 28,000 hours;

If you need a customized solution, please contact the CHANGYU engineer team - let corrosion and wear become history, starting with choosing a real ace pump.

#Slurry pump #Corrosion resistant pumps #Wear-resistant pump #Acid pump #Alkali pump #Water treatment pumps

Fluoroplastic centrifugal pumps can easily cope with the problem of caustic soda transportation

2025-05-16

Caustic soda (sodium hydroxide) is an important raw material in the chemical industry, but its strong corrosiveness poses a challenge to transportation equipment. Traditional metal pumps are prone to corrosion and have a short lifespan, while fluoroplastic centrifugal pumps are an ideal solution due to their excellent corrosion resistance and reliability. This article focuses on analyzing their application advantages.

1. Challenges and industry pain points of caustic soda transportation

Caustic soda (sodium hydroxide) is a strong alkaline substance, which is extremely corrosive at a concentration of 30%-50%. According to the National Association of Corrosion Engineers (NACE), in the chemical industry, equipment damage caused by corrosion accounts for about 35% of all equipment failures, of which alkaline medium corrosion accounts for 18%. The service life of traditional 304/316 stainless steel pumps when conveying caustic soda is usually no more than 6 months, while cast iron pumps corrode faster.

Industry pain points are mainly manifested in:

· High costs caused by frequent equipment replacement

· Safety hazards caused by leakage risks

· Loss of production efficiency caused by downtime maintenance

· Medium pollution affects product quality

2. Core advantages and technical analysis of fluoroplastic centrifugal pumps

2.1 Excellent corrosion resistance

a. Fluoroplastic centrifugal pumps use PTFE (polytetrafluoroethylene) or PVDF (polyvinylidene fluoride) as the main material. Experimental data show:

·PTFE material has an annual corrosion rate of <0.01mm under 50% caustic soda concentration and 80℃

·PVDF material has an annual corrosion rate of <0.05mm under 40% caustic soda concentration and 60℃

Compared with stainless steel materials (annual corrosion rate>1mm), the corrosion resistance is improved by more than 100 times

b. Material selection guide:

·Normal temperature (<60℃), medium and low concentration (<30%): PVDF material has a higher cost performance

·High temperature (>60℃), high concentration (>30%): PTFE material is better

·PFA (soluble polytetrafluoroethylene) material can be considered for special working conditions

2.2 Advanced sealing technology

a. Fluoroplastic centrifugal pump adopts double-end mechanical seal system, with the following characteristics:

Seal life: up to 8000-10000 hours

Leakage rate: <0.5ml/h (much higher than API682 standard)

Auxiliary system: optional flushing, cooling and other devices

b. Sealing configuration recommendations:

Standard working conditions: single-end mechanical seal

Hazardous media: double-end mechanical seal + isolation liquid system

Particle-containing media: carbide sealing surface

2.3 Optimized hydraulic design

a. Through CFD fluid dynamics simulation optimization, modern fluoroplastic centrifugal pumps have the following features:

Efficiency improvement: 15-20% higher than traditional design

Energy consumption reduction: more than 30% energy saving under typical working conditions

NPSHr value: can be as low as 2m, effectively avoiding cavitation

b. Performance curve features:

Flat Q-H curve, suitable for flow fluctuation conditions

Wide high-efficiency zone, flow range of efficiency>75% up to 40%

Low specific speed design, suitable for high head requirements

3. Fluoroplastic centrifugal pump purchase guide

3.1 Comparison of well-known brands

3.2 Key parameters for purchase

Flow range: 0.5-500m³/h

Lift range: 5-80m

Temperature range:

PVDF: -20℃~90℃

PTFE: -50℃~150℃

Pressure level: PN6-PN16

3.3 Key points for supplier evaluation

Qualification certification: ISO9001, API685, etc.

Project cases: Application experience in the same industry

R&D capabilities: Number of patented technologies

After-sales service: Response time, spare parts inventory

4.Typical application cases

Case 1: A chlor-alkali enterprise in Hubei

Problem: The original stainless steel pump corroded and perforated in 3 months

Solution: Use PTFE-lined centrifugal pump

Effect: Extended service life to 4 years, reduced maintenance cost by 70%

Case 2: A pharmaceutical factory in Zhejiang

Requirement: Transport 40% NaOH, temperature 65℃

Selection: PVDF material, double-end seal

Operation data: Continuous operation for 18 months without failure

5. Maintenance and maintenance recommendations

a. Daily inspection:

Vibration value: <4.5mm/s (ISO10816 standard)

Bearing temperature: <75℃

Seal leakage: Visual inspection

a. Regular maintenance:

Every 2000 hours: Check the mechanical seal

Every 5000 hours: Replace the bearing lubrication Grease

Every year: comprehensive disassembly and inspection

c. Fault handling:

Flow rate drop: check impeller wear/blockage

Abnormal vibration: check alignment/bearing status

Seal leakage: check seal surface wear.

Sixth, industry development trend

a. Intelligent direction:

Equipped with IoT sensors to monitor operating status in real time

Predictive maintenance system to reduce unexpected downtime

b. Material innovation:

Nano-modified fluoroplastics to improve mechanical strength

Composite materials application to optimize cost performance

c. Energy efficiency improvement:

IE4 ultra-high energy efficiency motor matching

Continuous optimization of hydraulic model

Conclusion

Fluoroplastic centrifugal pumps have become the preferred equipment for conveying highly corrosive media such as caustic soda due to their excellent corrosion resistance, reliable sealing technology and high efficiency and energy saving. When choosing, it is recommended that users compare the technical characteristics and service capabilities of different brands according to specific working conditions and choose the most suitable products. With the advancement of materials science and manufacturing technology, fluoroplastic centrifugal pumps will play an important role in a wider range of chemical fields and provide strong guarantees for the safe and efficient operation of process industries.

#Corrosion resistant pumps #Chemical Process Pumps #PTFE Pumps #PVDF Pumps #Caustic soda delivery pump #Fluoroplastic pump manufacturers

How to choose from 304, 316, 316L, 2205, 904L stainless steel materials when buying a pump

2025-05-16

Stainless steel has become one of the most commonly used materials in pump manufacturing due to its excellent corrosion resistance and mechanical properties. This article focuses on the application of several common stainless steel materials in pumps, analyzes their chemical composition differences, mechanical performance characteristics and applicable working conditions, and provides a reference for users to select models.

1. "The most familiar friend": 304 stainless steel (06Cr19Ni10)

Chemical composition and characteristics

304 stainless steel is the most commonly used austenitic stainless steel, and its typical chemical composition is:

· Chromium (Cr): 18-20%

· Nickel (Ni): 8-10.5%

· Carbon (C): ≤0.08%

· Manganese (Mn): ≤2.0%

· Silicon (Si): ≤1.0%

· Phosphorus (P): ≤0.045%

· Sulfur (S): ≤0.03%

a、Mechanical properties

·Tensile strength: ≥515 MPa

·Yield strength: ≥205 MPa

·Elongation: ≥40%

·Hardness: ≤201 HB

b、Applicable working conditions

304 stainless steel has good corrosion resistance and formability, and is suitable for:

·General corrosive media: such as dilute nitric acid, organic acids, etc.

·Temperature range: -196℃ to 800℃ (short term)

Due to the properties of 304 stainless steel, it is commonly used in: drinking water systems, food processing, and chemical industries for the transportation of weakly corrosive media.

Stainless steel sewage pump

c. 304 stainless steel has limitations in use

·Not resistant to chloride corrosion (such as seawater and salt water)

·Prone to stress corrosion cracking in sulfur-containing environments

2. "A Warrior Who Rejects Corrosion": 316 Stainless Steel (06Cr17Ni12Mo2)

Chemical Composition and Characteristics

316 stainless steel is an upgraded version of 304, with the addition of molybdenum:

· Chromium (Cr): 16-18%

· Nickel (Ni): 10-14%

· Molybdenum (Mo): 2-3%

· Carbon (C): ≤0.08%

The remaining elements are similar to 304, and the corrosion resistance is greatly improved.

a、Mechanical properties

·Tensile strength: ≥515 MPa

·Yield strength: ≥205 MPa

·Elongation: ≥40%

·Hardness: ≤217 HB

b、Applicable working conditions

Compared to 304 stainless steel, 316 has better corrosion resistance due to the addition of molybdenum:

· Chloride environment: more resistant to seawater and salt water corrosion than 304

· Strong acid environment: better resistance to sulfuric acid, phosphoric acid, etc.

· Temperature range: -196℃ to 800℃ (short term)

Therefore, it is commonly used in: moderately corrosive media in seawater desalination, pharmaceutical, and chemical industries

c、Advantages

·Higher pitting equivalent PREN value (about 25, 304 is about 19)

·More resistant to crevice corrosion and stress corrosion cracking

3. "Special Forces Specialized in Solving Difficult Problems": 316L Stainless Steel (022Cr17Ni12Mo2)

Chemical Composition and Characteristics

316L is an ultra-low carbon version of 316:

Carbon (C): ≤0.03% (significantly lower than 0.08% of 316)

The remaining components are basically the same as 316

a、Mechanical Properties

·Tensile Strength: ≥485 MPa

·Yield Strength: ≥170 MPa

·Elongation: ≥40%

·Hardness: ≤217 HB

b、Applicable Working Conditions

The low carbon content makes it more suitable for:

·Welding applications: reduce carbide precipitation in the heat affected zone of welding

·High temperature corrosion environment: more resistant to intergranular corrosion in the range of 450-850℃

·Highly corrosive media: such as concentrated nitric acid, organic acids, etc.

c、Common Applications

Nuclear industry, fine chemicals, high temperature corrosion environment

d、Special Advantages

·No annealing required after welding

·More stable in long-term high temperature environment

4. "The Smooth Socialite": Duplex Stainless Steel 2205 (022Cr23Ni5Mo3N)

Chemical Composition and Characteristics

Duplex stainless steel has both austenite and ferrite structures:

· Chromium (Cr): 22-23%

· Nickel (Ni): 4.5-6.5%

· Molybdenum (Mo): 3.0-3.5%

· Nitrogen (N): 0.14-0.20%

· Carbon (C): ≤0.03%

a、Mechanical Properties

· Tensile Strength: ≥620 MPa

· Yield Strength: ≥450 MPa (significantly higher than austenitic stainless steel)

· Elongation: ≥25%

· Hardness: ≤290 HB

IH stainless steel centrifugal pump

b、Applicable working conditions

2205 duplex stainless steel is particularly suitable for:

·High chloride environment: high concentration chloride solutions such as seawater and brine

·High stress environment: applications requiring high strength

·Environment where corrosion and wear coexist: such as media containing solid particles

·Temperature range: -50℃ to 300℃

·Common applications: offshore oil platforms, chemical process pumps, desulfurization systems

c、Outstanding features of 2205 duplex stainless steel

·PREN value up to 35-40

·Excellent resistance to stress corrosion cracking

·Good wear resistance and fatigue strength

5. "Challenger in extreme environments": Super austenitic stainless steel 904L (015Cr21Ni26Mo5Cu2)

Chemical composition and characteristics

Super austenitic stainless steel with high alloy content:

· Chromium (Cr): 19-23%

· Nickel (Ni): 23-28%

· Molybdenum (Mo): 4-5%

· Copper (Cu): 1-2%

· Carbon (C): ≤0.02%

a、Mechanical properties

· Tensile strength: ≥490 MPa

· Yield strength: ≥216 MPa

· Elongation: ≥35%

· Hardness: ≤220 HB

b、904L applicable working conditions

904L is suitable for extremely corrosive environments:

1. Strong acid environment: concentrated sulfuric acid, phosphoric acid, etc.

2. Complex mixed media: media containing multiple corrosive components

3. High temperature corrosive environment: up to 400℃

Because of these characteristics, 904L is commonly used in: chemical industry strong corrosive media transportation, flue gas desulfurization system, pharmaceutical industry, etc.

c、Special advantages

·Good corrosion resistance to both reducing and oxidizing media

·Excellent resistance to pitting and crevice corrosion

6. Purchase considerations

1. Medium characteristics: pH value, chloride ion content, oxidizing/reducing properties

2. Temperature range: operating temperature and fluctuation range

3. Mechanical requirements: pressure, flow rate, whether it contains solid particles

4. Economic efficiency: balance between initial cost and service life

Buyers can consult the manufacturer or make inquiries based on this information.

7. Scope of application and application recommendation

8.Conclusion

The selection of stainless steel materials for pumps requires comprehensive consideration of media characteristics, working environment and economic factors. The 304/316 series is suitable for most general corrosive environments, titanium-stabilized stainless steel is suitable for high-temperature applications, and duplex stainless steel and super austenitic stainless steel are for more demanding working conditions. The correct material selection can not only extend the service life of the stainless steel pump, but also reduce maintenance costs and ensure safe and stable operation of the system. It is recommended that users consult professional technicians when selecting and make a decision after a detailed working condition analysis.

#304 stainless steel pump #316 stainless steel pump #316L stainless steel pump #Stainless steel sea water pump

Stainless steel high temperature magnetic pump selection guide

2025-05-16

Stainless steel high temperature magnetic pumps (high temperature magnetic pumps, corrosion resistant magnetic pumps) are widely used in chemical, pharmaceutical, electroplating and other industries. Their leak-free, high temperature and corrosion resistant characteristics make them an ideal choice for conveying hazardous media. This article provides a detailed magnetic pump selection guide, covering the comparison of pump types under different working conditions (such as high temperature, strong acid, and medium containing particles).

1. Pump type selection under different media and temperature conditions [Stainless steel magnetic pump, chemical pump selection]

Stainless steel high-temperature magnetic pumps are widely used in chemical, pharmaceutical, electroplating and other industries due to their excellent corrosion resistance and high temperature resistance. For different working conditions and media, the following factors should be considered when selecting:

①. Medium characteristic selection [acid and alkali resistant pump, high-temperature medium transportation]

·Corrosive media: Select 316L or 904L stainless steel material, 904L has better tolerance to strong acids and alkalis.

·High-temperature media: Standard type can be selected below 200℃, and high-temperature special type needs to be selected for 200-350℃.

·Particle-containing media: Standard type can be selected for particle content <5%, wear-resistant type or larger gap design needs to be selected for >5%.

·Easy to crystallize media: Models with insulation jackets should be selected to prevent the medium from crystallizing in the pump.

②. Comparison of working conditions of magnetic drive pump and leakage-free pump

2. Detailed explanation of technical parameters of mainstream models [Magnetic pump parameters Pump performance curve]

①. Models and parameters of chemical pumps such as CQB and IHF

CQB, IHF and other chemical pumps

②. Key performance parameters

·Flow rate: Select according to process requirements, it is recommended to leave a 10-15% margin

·Lift: Consider pipeline loss and vertical lifting height

·Temperature: The actual working temperature should be lower than the rated temperature of the pump by more than 20°C

·Power: Adjust according to the specific gravity and viscosity of the medium, high viscosity medium requires increased power.

3. Professional selection steps and usage suggestions

①. Five-step selection method

· Clearly define the characteristics of the medium: including composition, concentration, temperature, viscosity, particle content, etc.

· Determine process parameters: flow, head, inlet and outlet pressure, etc.

· Select materials: Select the appropriate stainless steel grade according to the corrosiveness of the medium

· Consider special needs: such as explosion-proof, aseptic, wear-resistant and other special requirements

· Check supporting equipment: motor power, cooling system, control system, etc.

②. Key points for the use and maintenance of magnetic pumps

· Installation: Ensure that the inlet has sufficient net positive suction head (NPSHa)

· Before starting: The pump must be primed and dry operation is strictly prohibited

· During operation: Monitor the bearing temperature, which should not exceed the ambient temperature +70℃

· Shutdown maintenance: The medium should be drained for long-term shutdown to prevent crystallization or corrosion

High temperature magnetic pump

③. Common selection errors

· Ignoring the impact of medium temperature changes on pump performance

· Underestimating the pipeline resistance and resulting in insufficient head

· Ignoring the correction of medium viscosity to pump performance

· Selecting too large a safety margin leads to energy waste

Through the above guidelines, users can choose the most suitable stainless steel high-temperature magnetic pump model according to specific working conditions and medium characteristics to ensure long-term stable operation of the equipment and improve production efficiency. It is recommended to consult professional technicians or pump manufacturers before the final selection to obtain more accurate selection suggestions.

#Magnetic drive pump #Stainless steel magnetic pump #Acid and alkali resistant pump #Leak-free pump #‌High temperature magnetic pump #‌Corrosion-resistant magnetic pump

Why choose SSIC mechanical seals to deal with high temperature corrosive media

2025-05-16

In the chemical, metallurgical, mining and other industries, mortar pumps and magnetic pumps, as core equipment for conveying high-temperature corrosive media, have long faced pain points such as #seal failure, #material corrosion, and #particle wear. Especially when conveying media containing solid particles such as hydrochloric acid, hydrofluoric acid, and strong alkali, traditional mechanical sealing materials (such as alumina ceramics and tungsten carbide) often cause equipment downtime due to insufficient corrosion resistance or poor thermal shock resistance, resulting in huge maintenance costs. This article will analyze the performance advantages of #pressureless sintered silicon carbide (SSIC) materials and explore how it can become the ultimate sealing solution under high-temperature corrosive conditions.

Ⅰ. Extreme Challenges of High-Temperature Corrosive Conditions to Sealing Materials

1.1 Typical Failure Scenarios

#Mortar Pump: When conveying corrosive slurry with 60% solid content (such as acidic slurry with pH < 2), grooves are formed on the sealing surface due to #abrasive wear and #chemical corrosion, resulting in leakage exceeding the industry warning value of 20mL/h.

#High-Temperature Magnetic Pump: When the medium temperature exceeds 180°C, the traditional sealing ring deforms due to the difference in thermal expansion coefficient (such as #tungsten carbide CTE≈5.5×10⁻⁶/°C), causing the sealing surface to be uneven, resulting in the magnetic pump #isolation sleeve rupture or #bearing jamming.

1.2 Performance bottlenecks of traditional materials

Performance bottleneck of traditional materials

Ⅱ. Breakthrough performance of pressureless sintered silicon carbide

2.1 Material science advantages

Extreme corrosion resistance: The corrosion rate in boiling concentrated hydrochloric acid (37% HCl) is <0.02mm/year (NACE TM0177 standard), and it can operate stably in the full range of pH=0~14, perfectly matching the high chloride medium working conditions of mortar pumps.

#High temperature stability: It still maintains a bending strength of >300MPa at 1600℃ (ASTM C1161 test), and the thermal conductivity reaches 120W/m·K (4 times that of #316L stainless steel), which significantly reduces the risk of thermal stress cracking of magnetic pumps under high temperature conditions.

#Nano-level sealing surface‌: Through HIP (hot isostatic pressing) densification process, the porosity is <0.1%, the surface roughness Ra≤0.1μm (ISO 4287 standard), and the leakage rate is less than 0.01mL/m·h, which meets the requirements of API 682 Plan 53B sealing system.

2.2 Engineering application verification

#Mortar pump case‌: After a copper smelter upgraded the original alumina ceramic seal to SSiC mechanical seal, when conveying #copper concentrate slurry containing 35% H₂SO₄ and 40% solid content, the service life was increased from 42 days to 18 months, saving more than 1.2 million yuan in maintenance costs each year.

#Magnetic pump case‌: In the ethylene cracking unit of a petrochemical enterprise, the SSiC seal operated continuously for 26,000 hours without leakage under 320℃ hot oil medium, extending the service life by more than 6 times compared with the traditional solution.

III. Guide to key technical parameters for selection

For different pump types, the following optimized configuration is recommended:

Guide to key technical parameters for selection

IV. Industry Development Trends

According to the Grand View Research report, the global #silicon carbide mechanical seal market size will reach US$1.78 billion in 2023, of which the pressureless sintering process accounts for 62%. With the surge in demand for #‌corrosion-resistant magnetic pumps‌ and #‌wear-resistant mortar pumps‌ in emerging fields such as third-generation semiconductor manufacturing and lithium battery slurry delivery, SSiC mechanical seals are becoming the default choice for engineers to cope with extreme working conditions.

Conclusion‌

Whether facing the #‌abrasion-corrosion coupling working conditions‌ of mortar pumps or the #‌high temperature and high pressure sealing challenges‌ of #magnetic pumps, pressureless sintered silicon carbide materials have shown disruptive performance breakthroughs. It is recommended that equipment manufacturers focus on the porosity (needed to be <0.5%) and crystal phase purity (β-SiC accounts for >95%) of SSIC when selecting, and jointly conduct ASTM G65 wear simulation tests with seal suppliers to maximize the equipment MTBF (mean time between failures).

#Mortar Pump #Chemical pump #Mortar Pump Wear Solutions #Corrosion resistant magnetic pump #high temperature pumps

Correct Preparation of Salt Solutions for Salt Spray Testing

2025-05-16

Salt spray testing is a critical corrosion evaluation method widely used in industries such as automotive, aerospace, and electronics. To ensure accurate and repeatable test results, it is essential to prepare the salt solution correctly and use a high-quality salt spray test chamber that maintains precise testing conditions. Below are the preparation procedures for common salt spray tests, including Neutral Salt Spray (NSS), Acetic Acid Salt Spray (AASS), and Copper-Accelerated Acetic Acid Salt Spray (CASS):

1. Neutral Salt Spray (NSS) Solution Preparation

Prepare sodium chloride solution: Dissolve 50g of sodium chloride (NaCl) in 1L of distilled or deionized water to achieve a concentration of 50g/L ± 5g/L. Stir until completely dissolved.
Adjust pH (if necessary): Measure the pH of the solution using a pH meter. The pH should be within 6.4–7.0. If adjustment is required:

- Use sodium hydroxide (NaOH) to increase pH.
- Use glacial acetic acid (CH₃COOH) to decrease pH.
- Note: Even small amounts of NaOH or acetic acid can significantly alter pH, so add cautiously.

For optimal performance, ensure the solution is used in a professional salt spray test chamber that provides consistent temperature, humidity, and spray distribution.

2. Acetic Acid Salt Spray (AASS) Solution Preparation

Prepare base sodium chloride solution: Same as NSS (50g NaCl per 1L distilled/deionized water).
Adjust pH: Add glacial acetic acid to the NaCl solution while stirring. Measure the pH until it reaches 3.0–3.1.

A reliable salt spray corrosion test chamber with precise pH monitoring and spray control is crucial for AASS testing, as slight deviations can affect test validity.

Salt Spray Corrosion Test for Charging Cables

3. Copper-Accelerated Acetic Acid Salt Spray (CASS) Solution Preparation

Prepare sodium chloride solution: Same as NSS (50g NaCl per 1L distilled/deionized water).
Add copper(II) chloride (CuCl₂): Dissolve 0.26g/L ± 0.02g/L of CuCl₂·2H₂O (or 0.205g/L ± 0.015g/L anhydrous CuCl₂) in the NaCl solution.
Adjust pH: Add glacial acetic acid while stirring until the pH reaches 3.0–3.1.

CASS testing requires an advanced salt spray test chamber capable of maintaining strict temperature and corrosion acceleration conditions to ensure fast and accurate results.

4. Key Considerations for Salt Spray Testing

Purity requirements:

Use high-purity NaCl (≥99.5%) with ≤0.1% sodium iodide and ≤0.5% total impurities.
Avoid NaCl with anti-caking agents, as they may act as corrosion inhibitors and affect test results.

2.Filtration: Filter the solution before use to prevent nozzle clogging in the salt spray test chamber.

3.Pre-test checks:

Verify the salt concentration and solution level before each test.
Ensure the salt spray corrosion test chamber is properly calibrated for temperature, humidity, and spray uniformity.

Why Choose a Professional Salt Spray Test Chamber?

A high-performance salt spray test chamber ensures:

✔ Precise environmental control – Maintains stable temperature, humidity, and spray conditions.

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Bending radius the ultimate guide

2025-05-16

Press brake is one of the most important tools in sheet metal processing. When using a press brake to process sheet metal, the bending radius is a key factor affecting the bending effect. In this article, we will give an overview of the bending radius of sheet metal.

Ⅰ. What is the bending radius of sheet metal?

The bending radius of sheet metal refers to the radius of the inner curve formed by the material when it is bent during sheet metal processing. This radius is very important to ensure that the bent parts have good appearance and structural strength. The size of the bending radius affects the stress distribution of the material, the accuracy of the bending angle, and the difficulty of subsequent processing.

Hydraulic CNC Press Brake Machines

Ⅱ. What determines the bending of sheet metal?

1. Material type

Different materials (such as aluminum, stainless steel, carbon steel, etc.) have different ductility and strength, which affects the required bending radius. Flexible materials can use a smaller bending radius, while materials with higher hardness require a larger radius.

2. Material thickness

Generally speaking, the thicker the material, the larger the bending radius should be to avoid material cracking or undesirable stress concentration

3. Bending angle

The larger the bending angle, the larger the bending radius may be required to ensure that the material will not crack or deform during the bending process.

4. Processing technology

Different bending processes (such as air bending, bottom die bending, etc.) have different requirements for bending radius. Process parameters such as bending speed and pressure will also affect the final bending radius.

sheet bending machine

5. Mold design

The shape and design of the mold determine the stress of the material during the bending process. A good mold can help achieve the required bending radius

6. Subsequent processing requirements

If the subsequent processing (such as welding, painting, etc.) has specific requirements for the bending radius, these factors need to be considered to select the appropriate radius

Ⅲ. Bending radius calculation of Press Brake

First, select the mold opening according to the 8-fold rule. It is recommended that the V-shaped mold opening should be 8 times the material thickness. The size of the mold opening directly affects the bending radius.

While there is no exact formula to determine the ideal bending radius for sheet metal, it can be estimated that the bend radius is equal to the sheet thickness under certain specific force conditions.

It is important to note that variations in material thickness can affect the accuracy of this estimate. The V-die opening can be 6 to 12 times the material thickness. The bend radius is closely related to the material thickness. For material thicknesses less than 6 mm, the bend radius is equal to the material thickness.

For material thicknesses greater than 6 mm but less than 12 mm, the bend radius is generally 1.5 times the material thickness. For material thicknesses greater than 12 mm, the bend radius is approximately 3 times the material thickness.

The bending radius of the press brake can be calculated using the formula, all in millimeters:

r = (v - mt) / 2

- R is the bending radius

- V is the width of the V-shaped opening of the die

- MT is the material thickness

For example: if the die opening is 30mm and the plate thickness is 3mm, the bending radius is R=(30-3)/2=13.5mm

It is important to know that these are only rough guidelines, and there are many factors that affect the bending radius, so it is difficult to determine an exact number. When the plate thickness is equal to the bending radius, the optimal bending radius is achieved. The bend formed with this radius is consistent in angle and size, and the springback is minimal.

IV. What is the minimum bending radius of sheet metal

The smaller the bending radius, the greater the bending pressure required. Sheet metal is very prone to cracking, deformation or breaking during the bending process, and it is also easy to damage the mold. To avoid these problems, we should pay attention to the minimum inner bending radius.

Due to the different characteristics of bending methods, materials and molds, the minimum bending radius should also be paid attention to. In order to obtain a perfect sheet metal product, try to make the inner radius of the bend close to the thickness of the plate.

Choose sheet metal materials with high ductility. The greater the tensile strength and hardness of the sheet metal, the greater the bending pressure required.

The bending radius plays a vital role in sheet metal bending. The correct inner radius ensures the bending quality of the workpiece. The wrong inner radius of sheet metal bending can cause the workpiece to deform or even break. This article provides an overview of sheet metal bending. The use of ZYCO Press Brake helps to produce more precise workpieces. If you have any questions about large radius bending or any other type of sheet metal bending on a bending machine, please contact us.

#cnc press brake #Hydraulic CNC Press Brake Machines #Sheet Metal Bending Press Brake #Small CNC Press Brake #sheet bending machine #Twist axis synchronous bending machine #torsion shaft bending machines #cnc laser cutting machines #press brake bending machine

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