Japan SUS631 (17-7 ph gb 0 cr17ni7al) is a kind of precipitation-hardening stainless steel, high strength and high hardness, resistance to fatigue, good corrosion resistance and can die forging, as well as in high temperature and little deformation, the steel performance is good, especially with the aerospace field, this special alloys are also adapted to the other has high strength, corrosion resistance requirements of the field. In a high temperature to 316 ℃, the spring performance is still good. SUS631 used in aerospace, chemical, petrochemical, paper and metal processing industries.
Chinese name
SUS631
Silicon (Si)
1.00 or less
Phosphorus (P)
0.035 or less
Sulfur (S)
0.030 or less
SUS631 chemical composition:
The editor
SUS631 stainless steel
Chromium (Cr) 16.00 ~ 18.00,
Aluminum (Al) 0.75 ~ 1.50,
Carbon (C) 0.09 or less,
Manganese (Mn) of 1.00 or less,
Nickel (Ni) 6.50 ~ 7.75,
Copper (Cu) of 0.5 or less
Mechanical properties:
The editor
Tensile strength of sigma b (MPa) : solid solution, 1030 or less; 565 ℃ ageing, p 565; 510 ℃ ageing, p. 1230
Conditions to yield strength sigma (MPa) 0.2: solid solution, 380 or less; 565 ℃ ageing, p 565; 510 ℃ ageing, p. 1030
Elongation delta (%) : solid solution, 20 or more; 565 ℃ ageing, 5 or more; 510 ℃ ageing, 4 or more
Reduction of area bits (%) : 565 ℃ ageing, 25 or higher; 510 ℃ ageing, 10 or more
Hardness: solid solution, 229 hb or less; 565 hb 565 ℃ ageing, p; 510 ℃ ageing, p 388 hb
Heat treatment specification and metallographic organization:
The editor
Heat treatment specification:
1) solid solution, 1000 ~ 1100 ℃ cold quickly; 2) 565 ℃ ageing, after solid solution treatment, compared to 760 + 15 ℃ keep 90 min, within 1 h cooling below 15 ℃, 30 min, and then heated to 565 plus or minus 10 ℃ maintain 90 min, air cooling; 3) 510 ℃ ageing, after solid solution treatment, compared to 955 + 10 ℃ for 10 min, air cooling to room temperature within 24 h of cooling to - 73 + 6 ℃, keep 8 h, and then heated to 510 plus or minus 10 ℃ keep 60 min, air cooling.
Metallographic organization:
Organizational characteristics for precipitation hardening.
Delivery status:
General with heat treatment state delivery, its heat treatment type specified in the contract; Not specified, the heat treatment state delivery