17-7PH precipitation hardening stainless steel
Corresponding grade: sus631/S17700/0Cr17Ni7Al
It's a kind of diffusion hardening stainless steel, high strength, high hardness, fatigue resistance, good corrosion resistance and mold forging, and rarely deformed at high temperature. Die forging, as well as high temperatures rarely deformed, this steel performance is good, especially for aerospace field, this special alloy is also adapted to other high strength, corrosion resistance requirements of the field. In the high temperature to 316 ℃, spring performance is still good. SUS631 used in aerospace, chemical, petrochemical, paper and metal processing industry.
17-7PH Characteristics and Scope of Application:
Aluminum-added precipitation-hardening steel grades, used as springs, thermo-coils, and gauge components.
17-7PHMechanical Properties
Tensile Strength σb (MPa): solution, ≤1030; 565 ℃ aging, ≥1140; 510 ℃ aging, ≥1230
Conditional Yield Strength σ0.2 (MPa): solution, ≤380; 565 ℃ aging, ≥960. 510 ℃ aging,≥1030
Elongation δ5 (%): solid solution,≥20;565 ℃ aging,≥5;510 ℃ aging,≥4
Sectional shrinkage ψ (%):565 ℃ aging,≥25;510 ℃ aging,≥10
Hardness: solid solution,≤229HB;565 ℃ aging,≥363HB;510 ℃ aging,≥388HB. Ageing,≥388HB
17-7PH heat treatment specification and metallurgical organization
Heat treatment specification: 1) solid solution, 1000 ~ 1100 ℃ fast cooling; 2) 565 ℃ aging, solid solution treatment, 760 ± 15 ℃ to maintain 90min, cooled to below 15 ℃ in 1h. 1h cooled to below 15 ℃, keep 30min, then heated to 565 ± 10 ℃ keep 90min, air cooling; 3) 510 ℃ aging, after solid solution treatment, 955 ± 10 ℃ to keep 10min, air cooling to room temperature within 24h cooled to -73 ± 6 ℃, keep 8h, then heated to 510 ± 10 ℃ keep 60min, air cooling.
Metallographic organization: organization characteristics of precipitation hardening type.
Delivery state: generally delivered in heat treatment state, the type of heat treatment is specified in the contract; not specified, according to the non-heat treatment state delivery.
17-7PH main specifications:
17-7PH seamless pipe, 17-7PH steel plate, 17-7PH round steel, 17-7PH forgings, 17-7PH flanges, 17-7PH rings, 17-7PH welded pipe, 17-7PH steel strips, 17-7PH straight bars, 17-7PH wires and supporting welding consumables, 17-7PH round cake, 17-7PH flat steel, 17-7PH hexagonal bar, 17-7PH size head, 17-7PH elbow, 17-7PH tee, 17-7PH machined parts, 17-7PH bolts and nuts, 17-7PH fasteners
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