17-7PH, SUS631, UNS S17700, EN 1.4568, DIN X7CrNiAl17-7 is a precipitation hardening stainless steel

that provides high strength and hardness, excellent fatigue properties, good corrosion resistance,

good formability, and minimum distortion upon heat treatment.

Material 17-7PH is easily formed in the solution annealed condition,

then hardened to high strength levels by simple heat treatments to Conditions RH 950 and TH 1050.

The exceptionally high strength of Condition CH 900 offers many advantages where limited ductility

and workability are permissible.

Corrosion resistance in Conditions TH 1050 and RH 950 is generally superior to that of standard hardenable
chromium stainless steels such as Types 410, 420 and 431.

Corrosion resistance in Condition CH 900 approaches that of Type 304 in most environments.
Applications include: Springs, Rings, Washers, Heat Exchangers, Tubing

Stainless 17-7PH provides valuable property combinations particularly well suited for aerospace applications.

Material 17-7PH stainless also provides benefits for other applications requiring high strength and
good corrosion resistance, as well as excellent properties for flat springs at temperatures up to 600°F (316°C).

Material 17-7PH requires three essential steps in heat treating:
1) Austenite conditioning.
2) Cooling to transform the austenite
2) to martensite.
3) Precipitation hardening to
2) Condition TH 1050 or RH 950.

To obtain the highest mechanical properties from the alloy, Condition A material is transformed to martensite at
the mill by cold reduction to Condition C.

Hardening to Condition CH 900 is accomplished with a single, low-temperature heat treatment.

Chemical composition % weight

Mechanical properities

Specifications
AMS 5528 Sheet, Strip and Plate
AMS 5529 Sheet and Strip–Cold Rolled
MIL-S-25043 Plate, Sheet and Strip
ASTM A 693 Plate, Sheet and Strip
(Listed as Grade 631-UNS S17700)

ASTM F899

For Details, please Contact

WUXI GUANGLU Special Steel Co., Ltd.

Stainless martensitic • precipitation hardening steel • stainless ferritic — Our answer to your needs

Tel: +86 510 81812873

Email: export@guanglusteel.com