631 Stainless Steel

631 stainless steel, also known as 17-7 PH, is a chromium-nickel-aluminum precipitation-hardening stainless steel that possesses high strength and hardness, excellent fatigue properties, good corrosion resistance, and minimum distortion upon heat treatment.

In its initial condition, our 631 steel has an austenitic microstructure. However, it undergoes a transformation to a martensitic phase through a heat treatment process to achieve high strength and hardness.

The specification range of 631 stainless steel bars is extensive, ranging from φ30mm to φ2200mm, including specifications such as φ30, Φ35, φ40, φ45, φ50, Φ55, Φ60, Φ5, Φ70, Φ75, Φ80, Φ85, Φ90, Φ95, φ100, Φ200, Φ6, Φ8, Φ10-14, Φ15-50, Φ55-130, Φ15-Φ210, Φ210-550, Φ22, Φ27, Φ47, δ6, δ8 δ10-50, δ51-200(mm)1.

Due to its unique properties, 631 stainless steel rods are widely used in various fields:

: 631 stainless steel rods are commonly used to manufacture structural components for aerospace vehicles, such as aircraft fuselage frames and wing spars. These parts must withstand significant flight stresses, temperature variations, and vibrations, making the exceptional strength, hardness, fatigue resistance, and minimal deformation during heat treatment of 631 stainless steel essential for ensuring flight safety and reliability.

: In aerospace engines, 631 stainless steel rods are used to make small parts that require high-temperature and corrosion resistance, such as springs and washers. The harsh internal environment of engines, characterized by high temperatures, pressures, and corrosive media, necessitates materials that can perform reliably. The excellent corrosion resistance and thermal stability of 631 stainless steel make it an ideal choice.

: These rods are used to fabricate various chemical reaction vessels, pipelines, and valves. In chemical production, materials often encounter corrosive chemicals, and the good corrosion resistance of 631 stainless steel effectively protects against erosion, extending the lifespan of equipment. For instance, reactors made from 631 stainless steel are crucial in processes involving strong acids like sulfuric and hydrochloric acids.

: In refineries, 631 stainless steel rods can be used to manufacture components that operate under high temperatures and pressures in corrosive environments (e.g., containing sulfides). Their high strength and corrosion resistance ensure reliable performance in challenging conditions found in oil refining.

: As a raw material, 631 stainless steel rods are processed into various shapes and specifications for metal tools and hardware. Their workability and mechanical properties meet the diverse requirements of different metal products. For example, high-precision metal molds can be made from 631 stainless steel, ensuring durability and accuracy during use.

: These rods are commonly used to produce springs and washers. Their high strength, excellent elasticity, and corrosion resistance enable reliable performance in various operating environments, such as valve springs in automotive engines and shock absorber springs in large machinery.

: In paper production equipment, components requiring corrosion resistance and high strength are often made from 631 stainless steel. The use of chemical agents in the paper-making process and the mechanical stresses on the equipment necessitate materials that meet both corrosion and mechanical performance requirements, such as pressing rolls in paper machines.

: 631 stainless steel rods are used to manufacture critical components in automotive engines, such as valve springs and piston pins. These parts need to withstand high temperatures and high-speed operations, requiring high strength, wear resistance, and corrosion resistance, all of which 631 stainless steel provides.

: The rod can also be used to make spring components in automotive suspension systems. Its excellent elasticity and fatigue resistance contribute to the comfort and stability of vehicles during operation.

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