Stainless steel magnetic pumps are known for being leak-free. They are efficient and environmentally safe. These pumps are used in many industries, including chemical, pharmaceutical, petroleum, electroplating, and food processing.

This article introduces the stainless steel magnetic drive pump materials, such as 304, 316L, and 2205. It aims to improve the understanding of their characteristics and uses.

1. stainless steel magnetic drive pump materials - Austenitic stainless steel: 304 (ASTM A276) and 316L (ASTM A479)

Chemical composition：

304 stainless steel: 18% chromium, 8% nickel, ≤0.08% carbon

316L stainless steel: 16% chromium, 10% nickel, 2% molybdenum

Corrosion resistance：

304:

Acid and alkali resistant, but weak in high chloride or strong acid environments.

Performs well in neutral/weakly acidic media (such as tap water, kitchen detergents), but is prone to rust in chloride-rich environments (seawater, salt water).

316L:

Chloride resistance up to 1000 ppm (10 times higher than 304).

Excellent corrosion resistance in acidic, alkaline, brine and chloride-rich media.

Processing performance：

304: High plasticity, suitable for complex pump components.

316L: Higher strength and hardness, suitable for demanding mechanical applications.

Temperature range：

304: Suitable for low temperature environments.

316L: Stable under high temperature conditions.

Application：

304: Food processing, chemical laboratories, environmental equipment (neutral media, standard temperature).

316L: Petroleum, chemical and pharmaceutical industries (corrosive media, high temperature environment).

2. stainless steel magnetic drive pump materials - duplex stainless steel (2205/2507)

Chemical composition：

2205: 21% chromium, 2.5% molybdenum, 4.5% nickel-nitrogen alloy. High strength and impact toughness, but difficult to bend/form.

2507: Higher chromium/molybdenum content for greater strength, hardness, and thermal conductivity.

Corrosion resistance：

2205:

Excellent performance in marine/atmospheric environments, but not suitable for temperatures above 300°C or below -50°C.

2507:

Excellent resistance to pitting, crevice, and uniform corrosion, especially in chloride-rich environments.

Stable in high temperature/oxidizing environments.

Machinability：

2205: Relatively easy to machine.

2507: Requires advanced technology due to high strength/hardness.

Applications：

2205: Chemical and marine industries (moderate corrosion resistance).

2507: Offshore, petrochemical (high corrosion/high strength requirements).

3. stainless steel magnetic drive pump materials - special coating technology: Hastelloy C276

Chemical composition：

The main elements are nickel (Ni), chromium (Cr), molybdenum (Mo), iron (Fe), tungsten (W), titanium (Ti) and aluminum (Al). These elements help reduce intergranular corrosion.

Corrosion resistance：

Excellent resistance to chloride corrosion.

High thermal stability and heat resistance.

Processing performance：

Excellent weldability and cold/hot processing.

Application：

Chemical, petroleum and offshore engineering (suitable for chloride-rich environments).

Choosing the right material for a stainless steel magnetic pump requires a combination of performance and operational requirements. For customized solutions or technical assistance, please contact [Changyu Pump Valve] (changyupump.com). We provide complete services from material analysis to on-site simulation.

After working in the industry for many years, many companies still confuse mortar pumps and slurry pumps. They think these pumps are the same equipment used to transport coarse-grained materials, just with different names.

But is there really not much difference between mortar pumps and slurry pumps? Far from it. Such inquiries often reveal critical technical knowledge gaps in industrial applications.

1. The Difference between mortar pumps and slurry pumps 1: Material composition

Mortar pump：

Wear-resistant material: ultra-high molecular weight polyethylene (UHMWPE)

Molecular chain is 10 times longer than standard polyethylene

Corrosion resistance reaches the highest standard of ASTM G65

Applicable to extreme media (pH 1-14), such as desulfurization slurry, hydrochloric acid solution

Rely on the elastic deformation of polymer materials to buffer wear

Temperature range: -50℃ to 80℃

Slurry pump：

Wear-resistant material: high chromium alloy (Cr26-28%)

Hardness: HRC 60-65

Resistant to particle impact ≥7 Mohs hardness

Flow channel width: 1.5 times wider than mortar pump

Can accommodate solids with a diameter of ≤50mm

Rely on metal hardness to achieve direct wear resistance

Temperature resistance: up to 150°C

2. The Difference between mortar pumps and slurry pumps 2: Design principle

Mortar pump: uses mechanical drive (compressed air starts the piston/impeller) to accurately transport mortar and other mixtures to the construction site.

slurry pump: Using centrifugal pump technology, it can quickly separate and efficiently transport mud containing solid impurities.

3. The Difference between mortar pumps and slurry pumps 3: Application scenario

3.1. Mortar pump

Applicable to low viscosity, small particle materials:

Corrosive media: acid/alkaline liquid, smelting slurry, dilute sulfuric acid, wastewater

Particle limit: diameter ≤2mm, concentration ≤30%

Typical use:

Desulfurization system circulating slurry (pH 2-5, particles ≤ 0.5mm)

Chemical corrosion-resistant transportation (such as hydrofluoric acid, chlor-alkali solution)

Building mortar spraying (cement particles ≤ 0.5mm)

3.2. slurry pump

Handling high-viscosity media containing large solids:

Non-corrosive slurry: ore dressing slurry, sand and gravel mixture, sludge

Particle limit: diameter ≤ 50mm, concentration ≤ 60%

Typical uses:

Mine tailings transportation (iron slag: 10-30mm particles)

Coal washing plant sludge (coal gangue hardness ≥ 6 Mohs)

River dredging (sand and gravel mixture with 40% solid content)

4. The Difference between mortar pumps and slurry pumps 4: Performance characteristics

As shown in the figure above, the performance difference between mortar pumps and slurry pumps is very obvious:

Mortar pump: high head, large flow, corrosion resistance-optimized for corrosive environments.

Mud pump: sturdy structure, stable operation under extreme wear conditions-the first choice for high wear environments.

Through comprehensive comparison, The Difference between mortar pumps and slurry pumps is clear at a glance. If you need further help in selecting industrial pumps, please feel free to contact Changyu Pumps and Valves. Our team is always ready to answer your questions with expertise and enthusiasm.

We are professional manufacturing and trading enterprise of various kinds of bags and luggages for outdoor and daily use with more than 15 years production experience. We 

    In the wire and cable industry, accurate and reliable quality testing is an important link to ensure product performance and safety. Tophung is an enterprise specializing in the production of wire and cable testing equipment, and has long served many cable companies at home and abroad to explore the quality testing solutions of cable products in an all-round way. In the wire and cable industry, our main products are: TH-5806 Cable Bending testing machine, TH-5807 Cable 2D torsion testing machine, TH-5812 Cable vertical torsion testing machine, TH-5813 Cable drag chain bending testing machine, TH-5814 Cable 3D torsion testing machine, etc., these machines can be obtained from different repeated experiments. Detects the cable's performance of plastic deformation and displays its own defects.

ASTM (American Society for Testing and Materials) machines are specialized testing instruments designed to evaluate the mechanical and physical properties of materials according to ASTM standards. These machines play a crucial role in ensuring the quality, safety, and performance of materials used in various industries, including metal manufacturing, new composite materials, solar photovoltaic energy, wire and cable, automotive, and plastics.

At Suzhou TOPHUNG Machine Equipment Co., Ltd., we specialize in the research, development, production, sales, and service of high-quality ASTM testing machines. Our advanced testing equipment ensures that materials meet the rigorous requirements set by ASTM, enabling manufacturers to maintain consistency, reliability, and compliance with international quality standards.

Types of ASTM Testing Machines

ASTM testing machines come in various types, depending on the specific property being tested. Some common categories include:

1. Material Mechanics Testing Machines – Used for tensile, compression, and bending tests on metals, plastics, and composites.
2. Photovoltaic Special Testing Machines – Designed for evaluating solar panels and photovoltaic components.
3. Cable Testing Machines – Ensure the durability and strength of electrical wires and cables.
4. Fully Automatic Testing Machines – High-precision equipment for automated testing processes.
5. Dynamic Fatigue Testing Machines – Simulate long-term stress conditions on materials and products.
   

Why Choose TOPHUNG for ASTM Testing Machines?

• High Precision & Reliability – Our machines are built with advanced technology to provide accurate and repeatable test results.
• Comprehensive Solutions – We offer a wide range of testing equipment, covering various ASTM standards for different industries.
• Customization & OEM Services – We provide tailored solutions to meet specific customer needs, ensuring maximum efficiency and compliance.
• Strict Quality Control – Each machine undergoes rigorous quality checks before delivery, ensuring long-term performance and stability.
• Global Export Expertise – With years of experience in international trade, we supply ASTM testing machines to customers worldwide, offering professional after-sales support.
  

ASTM machines are essential for material quality assessment and compliance with international standards. At Suzhou TOPHUNG, we are committed to providing cutting-edge testing solutions that help businesses enhance product quality, reduce risks, and improve competitiveness in global markets. Whether you need material mechanics testing, photovoltaic testing, or cable testing machines, our team is ready to support you with top-notch equipment and technical expertise.

    Universal testing machines (utm) play a vital role in various industries by examining the mechanical properties and properties of materials, components and finished products. These versatile machines can perform a wide range of tests, including tensile strength, compression, bending, shearing and more.

    Suzhou Tophung has been committed to providing our customers with professional material testing, structural testing and finished product testing excellent test instruments and overall quality testing solutions.

    TOPHUNG's utm is designed with precision and accuracy in mind, ensuring reliable and repeatable test results. With different load capacities and flexible test configurations, it can meet the test needs of different industries. Whether you need to test metal materials, composites, solar panels, wire and cable, automotive parts or plastic products, our utm offers a complete solution. They enable you to assess the durability, strength and integrity of materials and finished products, ensuring compliance with industry standards and regulations.

Recently, a client from the Middle East visited our factory and intended to purchase an aluminum extrusion press for manufacturing door and window materials.

We recommended the customer to purchase a 5-inch extrusion press, specifically our 1100T aluminum extrusion press. Through our discussion, we realized that the customer had limited knowledge about extrusion presses. Previously, he used to purchase aluminum materials for making doors and windows, but now he plans to buy an extrusion press to produce aluminum materials himself.

Someone had suggested that he should buy an 1800T aluminum extrusion press for producing door and window aluminum materials. However, based on the sizes of the door and window materials he needs, we recommended the 1100T aluminum extrusion press instead.

 

Our Huanan 1100T aluminum extrusion press is also a 5-inch aluminum extrusion press, which is suitable for extruding various door and window aluminum profiles. The extrusion cylinder specifications of our 1100T aluminum extrusion press machine are:

Diameter: 132mm

Length: 800mm

Applicable aluminum billet size:

Diameter: 127mm

Length range: 400–750mm

 

 

Considerations When Extruding Aluminum: Extrusion Pressure

 

 

 

When extruding aluminum, it is crucial to consider the extrusion pressure. If the extrusion press tonnage is too high relative to the aluminum billet diameter and alloy type, the following issues may occur:

1. Over-Extrusion

Excessive Metal Flow Rate: Too much pressure can cause excessively fast metal flow, affecting dimensional accuracy and surface quality.

Overheating: Excessive extrusion pressure can lead to rapid temperature rise, potentially causing surface roughness, cracks, or even burning.

 

2. Mold and Die Damage

Shortened Die Lifespan: Excessive pressure may exceed the die’s load capacity, leading to rapid wear or even breakage.

Die Deformation: Continuous use of an overpowered press can cause plastic deformation of the die, affecting profile accuracy.

 

3. Equipment Damage

Accelerated Extrusion Cylinder Wear: Higher pressure accelerates wear on the inner wall of the extrusion cylinder, shortening its lifespan.

Hydraulic System Overload: If the tonnage is too high, the hydraulic system may overheat, experience pressure failures, or even develop leaks.

 

4. Negative Impact on Product Quality

Coarse Grain Structure: Excessive extrusion speed can lead to larger metal grains, reducing mechanical performance.

Increased Defects: High stress and temperature may introduce bubbles or inclusions inside the aluminum, affecting product quality.

Reduced Dimensional Accuracy: Overpowering the extrusion process may lead to unstable profile dimensions and out-of-tolerance products.

 

5. Increased Production Costs

Higher Energy Consumption: A high-tonnage extrusion press consumes more energy, leading to unnecessary waste if the press is oversized.

Increased Maintenance Costs: Faster wear and tear on molds, extrusion cylinders, and hydraulic systems lead to higher maintenance and replacement costs.

 

 

Choosing the Right Extrusion Press

 

 

When purchasing an aluminum extruder, it is essential to determine the size of the aluminum profiles to be produced and ensure that the press tonnage is appropriate.

For those who are new to the industry and considering purchasing an extrusion press, you can contact our sales team at Huanan Heavy Industry via WhatsApp or Email. Our sales team is highly knowledgeable about extrusion presses and can consult with engineers to provide professional guidance.

WhatsApp: +86 13450865812Email: jessica@huananmachine.com

Finally, we took our Middle Eastern client to the production line to observe the entire mechanical production process and inspect the 5-inch aluminum extrusion machine in action. This helped the customer better understand the Aluminum extrusion process and the necessary machinery, giving him a clearer view of the entire aluminum manufacturing process.

 

             The similarities and differences between copper extrusion and aluminum extrusion

Aluminum is one of the most common materials in our daily lives and an essential metal in various industries. However, in addition to aluminum, copper is also a widely used metal due to its excellent electrical and thermal conductivity, corrosion resistance, and other favorable properties. Copper has broad applications across multiple industries, such as:

Electrical and Electronics: Wires, cables, transformers, motors, and electronic components.

Construction: Piping systems, electrical wiring, and copper conductors.

Automotive: Electrical systems, radiators.

Industrial Equipment: Heat exchangers, valves, pumps, bearings, and gears.

Telecommunications: Cables.

Energy: Solar panels, generators.

Healthcare: Medical devices, surgical instruments, door handles, and handrails due to its antibacterial properties.

Both aluminum and copper are produced through extrusion processes, where pressure is applied to metal billets, forcing them through molds to form the desired shapes. While the basic production process is similar for both materials, copper and aluminum differ significantly in their properties, which affects their production methods and equipment.

Production Process:

Both aluminum and copper extrusion processes involve applying hydraulic or mechanical pressure to metal billets, which are heated to increase their plasticity for easier extrusion. The extrusion equipment, including extrusion cylinders, molds, extrusion rods, and heating systems, are similar for both metals. However, because copper and aluminum have different properties, the specific production conditions, such as temperature and pressure, vary.

Differences Between Aluminum and Copper:

Aluminum:

Density: Low

Melting Point: Approximately 660°C

Plasticity: High, making it easier to extrude

Extrusion Pressure: Relatively low

Copper:

Density: High

Melting Point: Approximately 1085°C

Hardness: Higher, making extrusion more difficult

Extrusion Pressure: Higher due to its hardness

Because of these differences, the heating temperature required for aluminum and copper extrusion is not the same. For aluminum, the heating temperature typically ranges from 400°C to 500°C, while for copper, it is generally higher due to its higher melting point. This difference in properties also results in copper requiring higher extrusion pressures compared to aluminum. This is one of the reasons why our HuaNan heavy Industry can produce copper extruders in addition to aluminum extruders.

Molds:

Mold material plays a crucial role in determining the extrusion quality. Aluminum extrusion molds are usually made from high-strength steel, offering durability. Copper extrusion molds, on the other hand, require materials with higher wear and heat resistance, making them less durable than aluminum molds.

Lubrication:

The choice of lubricant also differs. Aluminum extrusion typically uses graphite or oil-based lubricants, while copper extrusion requires high-temperature lubricants such as glass lubricants to manage the higher extrusion pressures.

Cooling:

After extrusion, cooling methods vary. Aluminum cools faster and is typically cooled using air or water, while copper requires a slower, gentler cooling process to prevent cracking.

Post-Treatment:

Aluminum often undergoes anodizing or spraying treatments, while copper is usually treated through electroplating or polishing to achieve a smooth finish.

Production Costs:

Despite similar production processes, the costs of extruding copper are generally higher than for aluminum due to copper's higher extrusion pressures and material costs.

Summary:

In conclusion, while the extrusion processes for aluminum and copper are fundamentally similar, the differences in their material properties lead to distinct requirements for heating, extrusion pressure, mold materials, lubrication, cooling, post-treatment, and cost. Copper extrusion typically involves higher pressures, more specialized molds, and more complex handling, which results in higher production costs compared to aluminum extrusion.

Forging and casting are two common metalworking processes, each with its own advantages and disadvantages, suitable for different applications.

Let’s start by looking at the benefits of forging over casting:

Higher Strength: During the forging process, the grain structure of the steel is compressed and refined, enhancing its strength and toughness.

Better Fatigue Performance: Forged parts can withstand repeated stresses, making them ideal for high-load and dynamic stress applications.

Fewer Internal Defects: Forging reduces defects such as porosity and shrinkage, improving the material’s density and overall quality.

High Dimensional Precision: Forged parts have precise dimensions, requiring minimal post-processing, which saves both material and time.

At Huannan Heavy Industry, we use forging for the main components of our aluminum extrusion machines, including the front beams, tension columns, extrusion rods, and extruder container. This allows our machines to better withstand the impact forces during extrusion.

In contrast, many competitors use cast steel for components like the front beam and tension column. The drawback of casting is that the material’s strength is lower due to a coarser grain structure, and casting is more prone to internal defects like porosity and shrinkage. These defects can weaken the material and affect its overall performance.

Aluminum extrusion machines made with cast steel are more likely to suffer from insufficient toughness and strength, making them prone to damage under prolonged operational pressure. While casting is more cost-effective, the quality simply cannot match that of forged steel. This is why our extrusion machines may be priced higher than those of our competitors, but the superior quality and longer service life make them a much better investment in the long run.

This is the confidence we have in Huannan Heavy Industry’s aluminum extrusion machines—our commitment to quality sets us apart.

In a chemical leak at a BASF plant in Germany, the failure of a traditional mechanical seal pump resulted in €12 million in equipment losses and triggered a 72-hour environmental pollution alert. This incident directly accelerated the global industry's adoption of magnetic drive pumps. According to a 2024 study by the International Journal of Chemical Safety, the widespread use of magnetic drive pumps has reduced global industrial leaks by 63% and reduced carbon emissions by about 4.5 million tons per year. This innovative technology based on magnetic coupling is reshaping the modern industrial fluid transmission paradigm with the advantages of zero leakage and high efficiency.

1. What is a magnetic drive pump?

A magnetic drive pump is a sealless pump that transmits power through magnetic field coupling. Its core design eliminates traditional mechanical shaft seals. According to the ISO 2858 standard definition, a magnetic drive pump uses an isolation sleeve to separate the inner and outer magnetic rotors, and uses rare earth permanent magnets (such as neodymium iron boron or samarium cobalt) for non-contact power transmission, completely eliminating the risk of leakage. The technology was named one of the "Top Ten Industrial Safety Innovations of the 21st Century" by ASME magazine and is ideal for conveying corrosive, toxic or high-purity media.

2. How does a magnetic drive pump work?

The operation of a magnetic drive pump relies on synchronous magnetic coupling:

1. Power transmission: The motor drives the outer magnetic rotor, and the magnetic field of the outer magnetic rotor penetrates the isolation sleeve (usually made of silicon carbide or Hastelloy) and rotates the inner magnetic rotor synchronously.

2. Medium transportation: The inner rotor is connected to the impeller and uses centrifugal force to move the liquid from the suction port to the discharge port.

3. Sealing mechanism: The isolation sleeve and the static seal form a double barrier to ensure that the medium is completely sealed.

3. Advantages and disadvantages of magnetic drive pumps

Advantages:

Zero leakage safety: Eliminates 99.7% of the risk of leakage (verified by API 685 standard), which is an ideal choice for hazardous media such as hydrofluoric acid and liquid chlorine.

High energy efficiency: The magnetic transmission efficiency reaches 98%, which saves 15%-20% energy compared with mechanical seal pumps.

Low maintenance cost: No dynamic seal, maintenance interval extended to 3-5 years

Disadvantages:

High initial cost: The price is 30%-50% higher than that of traditional pumps, mainly due to the cost of rare earth magnets (accounting for 35% of the total cost).

Media restrictions: Poor adaptability to liquids containing solid particles (>50μm) or high viscosity (>500cP).

Temperature sensitivity: Neodymium magnets demagnetize above 120°C and need to be upgraded to samarium cobalt magnets.

4. Application areas

Chemical and petrochemical: Transporting corrosive media such as hydrochloric acid and aniline.

Pharmaceutical and biotechnology: Aseptic vaccine filling lines that meet USP Class VI purity standards.

New energy and environmental protection: Liquid hydrogen circulation system for fuel cells, resistant to ultra-low temperatures (-253°C).

Microelectronics manufacturing: Ultrapure water delivery, particle contamination control <0.1μm.

5. How to choose a suitable magnetic drive pump?

1. Medium characteristics: pH, viscosity and solid content determine the choice of materials (for example, strong acids use PTFE lining).

2. Performance parameters: Flow (Q), head (H) and NPSHr (net positive suction head required) in accordance with ANSI/API 685.

3. Temperature range: Custom designs for extreme conditions (-112°C to 800°C) (e.g. double-layer isolation sleeve).

4. Certifications: ISO 9001 quality system and ATEX explosion-proof certification for hazardous environments.

6. Maintenance tips

Preventive maintenance strategy:

Monthly inspection: Measure the magnetic coupling air gap (standard: 1.5-3mm) and bearing wear (vibration <2.8mm/s).

Quarterly maintenance: Clean the impeller channel to prevent crystallization (e.g. sodium hydroxide accumulation).

Annual overhaul: Replace the isolation sleeve if the thickness wear exceeds 0.2mm.

7. Common faults and troubleshooting

Magnetic drive pumps redefine the boundaries of industrial safety with revolutionary technology. Choosing the right magnetic drive pump is not just an equipment investment, but a strategic commitment to a sustainable future. For expert advice on magnetic drive pump selection, contact Changyu Pumps & Valves - we offer tailor-made solutions to suit your needs.