What is SUS631 stainless steel?

SUS631 is a kind of dispersion hardening stainless steel with high strength, high hardness, fatigue resistance, good corrosion resistance and malleability, as well as high temperature and little deformation. This steel has good performance, especially applicable to the aerospace field. This special alloy is also applicable to other fields with high strength and corrosion resistance requirements. When the temperature reaches 316 ℃, the spring performance is still good. SUS631 is used in aerospace, chemical, petrochemical, paper and metal processing industries.

What is the chemical composition of SUS631 stainless steel?

Chromium (Cr) 16.00~18.00,

Aluminum (Al) 0.75~1.50,

Carbon (C) ≤ 0.09,

Manganese (Mn) ≤ 1.00,

Nickel (Ni) 6.50~7.75,

Copper (Cu) ≤ 0.5

What are the mechanical properties of SUS631 stainless steel?

Tensile strength σ B (MPa): solid solution, ≤ 1030; 565 ℃ aging, ≥ 1140; Aging at 510 ℃, ≥ 1230

Conditional yield strength σ 0.2 (MPa): solid solution, ≤ 380; 565 ℃ aging, ≥ 960; Aging at 510 ℃, ≥ 1030

Elongation δ 5 (%): solid solution, ≥ 20; 565 ℃ aging, ≥ 5; Aging at 510 ℃, ≥ 4

Reduction of area ψ  (%): aged at 565 ℃, ≥ 25; Aging at 510 ℃, ≥ 10

Hardness: solid solution, ≤ 229HB; Aging at 565 ℃, ≥ 363HB; Aging at 510 ℃, ≥ 388HB

What is the heat treatment specification of SUS631?

Heat treatment specification:

1) Solid solution, rapid cooling at 1000~1100 ℃; 2) Aging at 565 ℃, after solution treatment, 760 ± 15 ℃ for 90min, cool to below 15 ℃ within 1h, keep for 30min, and then heat to 565 ± 10 ℃ for 90min, air cooling; 3) Aging at 510 ℃, after solution treatment, keep at 955 ± 10 ℃ for 10min, air cooling to room temperature, cool to - 73 ± 6 ℃ within 24h, keep for 8h, and then heat to 510 ± 10 ℃ for 60min, air cooling.

Metallographic structure:

The microstructure is characterized by precipitation hardening.

Delivery status:

Generally, the goods are delivered in the state of heat treatment, and the type of heat treatment   is indicated in the contract; If not specified, the goods shall be delivered without heat treatment.

What are the benefits of SUS631 stainless steel?

The CrNiMo alloys are a family of austenitic stainless steels with superior corrosion resistance to many other stainless steels. Additionally, the alloys have high creep strength and rupture strength at elevated temperatures. The weldability of the alloys is also very good, making them suitable for a wide range of applications in both industrial and commercial settings.

How to use SUS631 stainless steel?

SUS631 is a Cr-Ni-Mo austenitic stainless steel that contains 2% molybdenum. As such, it is often used in environments where resistance to pitting and crevice corrosion is required, such as in chemical processing, oil and gas, and marine applications. When welding SUS631, it is important to use a filler metal that has a similar composition in order to maintain the corrosion resistance of the base metal.

What are the advantages of SUS631 stainless steel?

SUS631 is a Cr-Ni-Mo austenitic stainless steel with several advantages. Some of the key benefits of this stainless steel include:

High Strength and Toughness - This stainless steel has high strength and toughness, making it ideal for applications requiring these properties. 

Corrosion resistance - SUS631 has excellent corrosion resistance, making it suitable for a wide range of environments.

Weldability - This stainless steel is highly weldable, which means it can be used in a variety of welding applications. 

Formability - This stainless steel has good formability, which means it can be easily formed into various shapes and sizes. 

What are the disadvantages of SUS631 stainless steel?

There are some disadvantages to using SUS631 as your material of choice. First, it is more expensive than other materials on the market. Second, it's not as widely available as other options, so you might have trouble finding it when you need it. Finally, it's not as strong or durable as some other materials, so it may not be the best choice for high-stress applications.

What is the SUS631 stainless steel weld?

The SUS631 weld is a type of welding that is used to join two pieces of metal together. This weld is made by using a high-frequency current to heat the two pieces of metal until they are hot enough to melt together. This weld can be used on any type of metal, but it is most commonly used on stainless steel and aluminum.

What is the heat treatment of SUS631 stainless steel?

SUS631 heat treatment generally consists of three stages: heating, soaking, and cooling. In the heating stage, the metal is heated to a temperature above its critical point. This critical point is the temperature at which the metal's structure changes from austenite to ferrite. Soaking is the process of holding the metal at this temperature for a period of time in order to allow it to transform fully into ferrite. Finally, in the cooling stage, the metal is cooled slowly back down to room temperature.

What are the applications of SUS631 stainless steel?

SUS631 is a type of austenitic stainless steel that contains chromium, nickel, and molybdenum. This grade of steel is often used in the chemical industry for storage tanks, pressure vessels, and piping. SUS631 can also be used in the food and beverage industry for processing equipment, as well as in the pharmaceutical industry for containers and packaging.