400 series stainless steel pipes are a group of stainless steel alloys that are known for their martensitic structure and higher carbon content compared to the 300 series. Here are some key features and benefits of 400 series stainless steel pipes:

• Corrosion Resistance: The 400 series stainless steel pipes offer moderate to good corrosion resistance in various environments. While they are not as corrosion-resistant as the 300 series, they are suitable for applications in mildly corrosive environments, such as in freshwater or non-acidic solutions.
• High Strength: The 400 series stainless steel pipes exhibit high strength and hardness due to their martensitic structure. They offer good mechanical properties, including high tensile strength and impact resistance, making them suitable for applications that require strength and toughness.

400 Series Stainless Steel Pipe Supplier

400 Series Stainless Steel Pipe Factory in China

• Wear Resistance: The 400 series stainless steel pipes have excellent wear resistance, which makes them suitable for applications involving abrasive materials, such as conveyors, cutting tools, and wear plates. Their high hardness helps to resist surface wear and maintain dimensional stability.
• Heat Treatability: The 400 series stainless steel pipes can be heat treated to further enhance their mechanical properties. Heat treatment processes such as tempering or annealing can improve toughness, ductility, and machinability, providing flexibility in their application.

China 400 Series Stainless Steel Pipe Factory

China 400 Series Stainless Steel Pipe

• Magnetic Properties: The 400 series stainless steel pipes are generally magnetic due to their martensitic structure. This magnetic property can be advantageous in certain applications where magnetic properties are desired, such as in electromagnetic devices or magnetic assemblies.
• Cost-Effective: The 400 series stainless steel pipes are typically more cost-effective compared to the higher-grade stainless steel alloys. They provide a balance between strength, corrosion resistance, and cost, making them suitable for applications that require moderate corrosion resistance and good mechanical properties at a lower cost.

The factory quality inspector is helping the customer to measure the outer diameter of the pipe purchased by the customer.

Hardness measurement of stainless steel pipe

• Versatility: The 400 series stainless steel pipes are available in various grades, including 410, 416, and 430, each with specific properties and benefits. This range of grades allows for versatility in material selection, catering to different application requirements.
• Ease of Machining: The 400 series stainless steel pipes offer good machinability due to their lower chromium content compared to other stainless steel grades. They can be easily machined, drilled, or turned, making them suitable for applications where machining operations are required.

Hardness measurement of stainless steel pipe

Wall Thickness Measurement of Stainless Steel Tubes

• Wide Application Range: The 400 series stainless steel pipes find applications in various industries, including automotive, aerospace, cutlery, tools, and general engineering. They are used for components, shafts, fasteners, pump parts, and other applications that require a balance between strength, wear resistance, and cost.
• Recyclability: Stainless steel is highly recyclable, making the 400 series stainless steel pipes environmentally friendly and contributing to sustainable practices.

Manual inspection of inner wall of stainless steel pipe

China Stainless Steel Pipe Tube Supplier

1. Material Selection: The 400 series stainless steel typically includes grades such as 409, 410, 430, and others. These grades are known for their high strength, heat resistance, and corrosion resistance. The specific grade is selected based on the application requirements.
2. Billet Preparation: Stainless steel billets are prepared from selected raw materials. The billets undergo inspection to ensure they meet the required quality standards and are free from defects or surface irregularities.
3. Heating: The stainless steel billets are heated to a specific temperature range to make them malleable and suitable for the subsequent pipe forming process. Heating is typically done in a controlled atmosphere to prevent oxidation and maintain the material’s integrity.
4. Pipe Formation: The heated stainless steel billets are formed into pipes using various manufacturing techniques, such as hot extrusion, cold drawing, or pilgering. These methods shape the billets into the desired pipe dimensions, ensuring dimensional accuracy and mechanical properties.
5. Sizing and Shaping: The formed pipes undergo sizing and shaping operations to achieve the desired dimensions, including outer diameter, wall thickness, and shape. These operations can include reducing or expanding the diameter, adjusting the wall thickness, or shaping the pipes into specific profiles.
6. Heat Treatment (if applicable): Depending on the material grade and application, the pipes may undergo heat treatment processes such as annealing or stress relieving. Heat treatment enhances the pipes’ mechanical properties, such as strength and ductility, and relieves residual stresses.
7. Surface Treatment: The stainless steel pipes undergo surface treatments to remove any scale, oxides, or contaminants that may have formed during manufacturing. Processes such as pickling, passivation, or mechanical polishing can be used to achieve a clean and smooth surface finish.
8. Final Inspection and Testing: The manufactured stainless steel pipes undergo a final inspection and testing process to ensure they meet the required specifications and quality standards. This includes dimensional checks, visual inspection, non-destructive testing, and mechanical property testing.
9. Packaging and Delivery: The pipes are carefully packaged to protect them during transportation and storage. They are then delivered to customers or ready for installation in the intended applications.

The 400 series of stainless steel, including grades such as 410, 416, 420, and 430, offer varying levels of corrosion resistance, hardness, and machinability. While they may not exhibit the same level of corrosion resistance as the 300 series (e.g., 304 or 316 stainless steel), they have other desirable properties that make them suitable for specific applications. Here are some common applications for 400 series stainless steel pipes:

1. Cutlery and Kitchenware: 400 series stainless steel, particularly grades like 410 and 420, are commonly used in the manufacturing of cutlery, kitchen knives, and other utensils. These grades provide good hardness and wear resistance, making them suitable for sharp blades and cutting tools.
2. Automotive Exhaust Systems: Grade 409 stainless steel, which is a part of the 400 series, is commonly used in automotive exhaust systems. Its resistance to high-temperature oxidation and corrosion from exhaust gases make it a suitable choice for exhaust pipes and mufflers.
3. Heat Treatment Equipment: Certain grades within the 400 series, such as 416 and 420, are utilized in heat treatment equipment, including furnaces and kilns. They offer good heat resistance and can withstand high-temperature environments.
4. Pump Shafts and Valve Components: Some grades in the 400 series, such as 416, are well-suited for pump shafts and valve components due to their corrosion resistance and machinability. They can withstand the corrosive effects of certain fluids and offer good mechanical properties.
5. Decorative Applications: The 400 series stainless steel, particularly grade 430, is often used in decorative applications. It can be found in architectural trim, interior design elements, and appliances. Grade 430 stainless steel has a bright, shiny finish and good formability, making it suitable for these aesthetic applications.
6. Industrial Applications: The 400 series stainless steel, with its varying properties, finds use in various industrial applications where moderate corrosion resistance and good mechanical properties are required. This includes applications such as pumps, valves, shafts, fasteners, and other components.

Stainless steel pipes and tubes need to be packaged carefully to avoid any damage during transportation and handling. Here are some common ways in which stainless steel pipes are packaged:

• Bundles: Stainless steel pipes are often bundled together, with each bundle containing a specific number of pipes. They can be bundled with steel strips or plastic bands for secure transportation.

• Plastic Caps: The ends of the pipes may be covered with plastic caps to protect them from dust, moisture, and other foreign materials. This is particularly important for threaded or precision-cut ends, which need to be kept clean and undamaged.
• Wrapping: The pipes can be wrapped in plastic sheets or waterproof paper to protect against moisture, especially for long-term storage or for shipping in wet conditions.
• Padding: For certain applications or for precision-made pipes, padding material like foam or straw might be used within the package to prevent any damage or scratches on the pipe surfaces during transportation.

• Wooden Boxes or Crates: For higher-grade stainless steel pipes or for pipes that require extra protection, they may be packed in wooden boxes or crates. This provides additional protection against physical damage during shipping and handling.