631 Stainless steel tube manufacturer

631 is China's 0Cr17Ni7Al, 631 is semi-austenitic precipitation hardening stainless steel, is a kind of austenitic unstable stainless steel, this steel solid solution state, at room temperature for austenite structure, after cold processing, cold treatment or heating to about 750 degrees for adjustment treatment, austenite can be transformed into martensite, and then aging treatment,
The second phase can be precipitated on the martensite matrix to strengthen the steel.

631 Stainless steel tube Price in China ,Manufacturer of 631 Stainless Steel tube

Standard: GB/T 1220-2007
631 is China's 0Cr17Ni7Al, 631 is semi-austenitic precipitation hardening stainless steel, is a kind of austenitic unstable stainless steel, this steel solid solution state, at room temperature for austenite structure, after cold processing, cold treatment or heating to about 750 degrees for adjustment treatment, austenite can be transformed into martensite, and then aging treatment,
The second phase can be precipitated on the martensite matrix to strengthen the steel.
The function of Al is to form precipitation hardening phases such as (Ni3Al) with other elements.
In the aging process, cooling can not be carried out rapidly, otherwise it is difficult to achieve strengthening effect.

1) Solid solution, fast cooling at 1000 ~ 1100℃;
2) Aged at 565℃, after solid solution treatment, kept at 760±15℃ for 90min, cooled to below 15℃ for 30min within 1h, then heated to 565±10℃ for 90min, then cooled by air;
3) Aged at 510℃, after solid solution treatment, kept at 955±10℃ for 10min, cooled to room temperature for less than 24h to -73±6℃ for 8h, then heated to 510±10℃ for 60min, air cooled.