17-7PH is a precipitation hardening martensitic stainless steel that combines high strength and hardness with good corrosion resistance. Its corrosion resistance in conditions TH 1050 and RH 950 is generally superior to standard hardenable chromium types 400 series stainless steels, but is not as good as chromium-nickel type 304. Corrosion resistance in condition CH 900 is similar to type 304 in most environments. Like other martensitic steels, it is subject to cracking when exposed under stress in environments containing hydrogen sulfide. Such applications should be avoided.
Chinese designation: 17-7PH 沉淀硬化不锈钢
| Element | Min % | Max % |
|---|---|---|
| Cr | 16 | 18 |
| Ni | 6.5 | 7.75 |
| Al | 0.75 | 1.5 |
| Mn | — | 1 |
| Si | — | 1 |
| C | — | 0.09 |
| P | — | 0.04 |
| S | — | 0.03 |
| Fe | balance | — |
Chemical composition per the grade specification. Values are nominal; the mill test report is issued with every order, traceable to the heat number.
| Product form | ASTM / EN specification |
|---|---|
| Rod, bar and shape | A 564, A 484 |
| Plate, sheet and strip | A 693, A 480 |
| Forging | A 705, A 484 |
17-7PH (Type 631, UNS S17700, DIN W. Nr. 1.4568) is a stainless steels grade. 17-7PH is a precipitation hardening martensitic stainless steel that combines high strength and hardness with good corrosion resistance. Its corrosion resistance in conditions TH 1050 and RH 950 is generally superior to standard hardenable chromium types 400 series stainless steels, but is not as good as chromium-nickel type 304. Corrosion resistance in condition CH 900 is similar to type 304 in most environments. Li
ROBAN supplies 17-7PH as rod, bar and shape, plate, sheet and strip, forging, with custom dimensions to your drawing.
Yes. Every order ships with a mill test report covering the actual heat analysis. 3.2 documentation is available where the contract requires it.
Stock items ship within 3 to 7 working days. Cut-to-size and forged items typically run 15 to 30 working days depending on quantity and specification. Send us your drawing or enquiry for a firm lead time.
Drawing, grade, dimensions, quantity and delivery date — we price from those.
Request a Quote →Heat analysis report issued with every order at no extra charge.
Quality documentation →Shearing, sawing and machining to the tolerances on your drawing.
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