Introduction

15-7PH precipitation hardening stainless steel (also 15-7PH PH stainless steel, 15-7PH high strength stainless steel, 15-7PH spring stainless steel, 15-7PH cold rolled stainless steel strip) is a semi-austenitic precipitation hardening alloy that combines high strength and elasticity with excellent fatigue resistance and good spring properties. It is available in multiple heat treatment conditions including 15-7PH RH950, 15-7PH TH1050, and 15-7PH CH900, allowing engineers to tailor mechanical properties for demanding spring and precision applications. This grade offers superior dimensional stability during aging, making it ideal for precision components that require consistent performance under cyclic or static loads.

Chemical components (%)

Mechanical properties

Physical properties

15-7PH Stainless Steel Available Products and Standard

1. ASTM A693 / ASME SA693 

(Standard Specification for Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip)

Type: 

• 15-7PH Precipitation Hardening Stainless Steel Plate

• 15-7PH PH Stainless Steel Sheet

• 15-7PH High Strength Cold Rolled Stainless Steel Strip (Hot-rolled or Cold-rolled)

• Semi-austenitic spring stainless steel available in 15-7PH RH950, 15-7PH TH1050, 15-7PH CH900 heat treatment conditions (UNS S15700)

Size Range:

• Sheet / Strip: 0.1 – 6.0 mm thick × up to 1200 mm wide

• Plate: 3.0 – 100 mm thick × up to 3500 mm wide

• Length: up to 12000 mm

Surface: Annealed (Condition A), Bright, Ground, Pickled, No.1, 2B, Polished

Testing: Chemical analysis (C ≤0.09%, Cr 14‑16%, Ni 6.5‑7.75%, Al 0.75‑1.5%), tensile test per condition (RH950: Rm ≥1585 MPa, Rp0.2 ≥1480 MPa; TH1050: Rm ≥1310 MPa, Rp0.2 ≥1170 MPa; CH900: Rm ≥1720 MPa, Rp0.2 ≥1650 MPa), elongation (1‑5% depending on condition), hardness (CH900: ≥48 HRC), flattening test (for strip), dimensional inspection

2. AMS 5528 

(Aerospace Material Specification for Sheet, Strip, and Plate)

Type: 

• 15-7PH Heat Treatable Stainless Steel Sheet

• 15-7PH Stainless Steel Strip for Springs and Diaphragms

Size Range:

• Sheet / Strip: 0.025 – 3.18 mm (0.001″ – 0.125″) thick

• Width: up to 1220 mm

• Plate: up to 50 mm thick

Surface: Annealed (Condition A), Bright, Ground, Descaled

Testing: Chemical analysis, tensile test (Condition A: Rm ≤1034 MPa; aged per RH950/TH1050/CH900), hardness (CH900: 48‑50 HRC), flattening test, eddy current test (for strip), dimensional stability verification, ultrasonic test (for plate), dimensional inspection

Application

(1)Springs – 15-7PH stainless steel for springs (flat springs, coil springs, disc springs, leaf springs) leverages its good spring properties and high strength after CH900 or RH950 treatment, maintaining load stability and resisting relaxation over millions of cycles.

(2)Aerospace – 15-7PH stainless steel for aerospace components (landing gear springs, actuator springs, engine retainers) provides excellent fatigue resistance and dimensional stability under extreme temperature and vibration conditions.

(3)Diaphragms – 15-7PH stainless steel for diaphragms (pressure sensors, regulators, pumps, valves) offers high strength-to-thickness ratio with excellent elastic recovery and minimal creep, ensuring reliable deflection over extended service life.

(4)Washers – 15-7PH stainless steel for washers (lock washers, Belleville washers, spring washers) combines good spring properties with corrosion resistance, delivering consistent clamping force even after TH1050 or RH950 aging.

(5)Precision parts – 15-7PH stainless steel for precision parts (couplings, fasteners, medical instruments, MEMS housings) capitalizes on its dimensional stability and uniform hardness after heat treatment, enabling tight tolerances without post-machining distortion.

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