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Introduction
17-4PH precipitation hardening stainless steel (also 17-4PH PH stainless steel, 17-4PH high strength stainless steel, 17-4PH martensitic stainless steel) is a heat treatable stainless steel that offers an outstanding combination of high strength, good corrosion resistance, and excellent mechanical properties up to 600°F (316°C). It is supplied in multiple heat treatment conditions including 17-4PH H900, 17-4PH H1025, and 17-4PH H1150, allowing precise tailoring of strength and toughness for demanding applications. Manufactured to ASTM A564 17-4PH stainless steel (bar), ASTM A693 17-4PH stainless steel (plate/sheet), UNS S17400, AMS 5643 (bar/forgings), and AMS 5622 / AMS 5604 (sheet/strip/wire), this grade delivers reliable performance across aerospace, industrial, and general engineering sectors.
Chemical composition (%)
Composition | C | Si | Mn | Cr | Ni | Cu | P | S | Nb |
Min | \ | \ | \ | 15.5 | 3.0 | 3.0 | \ | \ | 0.15 |
Max | 0.07 | 1.0 | 1.0 | 17.5 | 6.0 | 5.0 | 0.035 | 0.03 | 0.35 |
Mechanic condition
Material Type | Condition | Ultimate Tensile Strength (PSI) | 0.2% Yield Strength (PSI) | Elongation (% In 2in.) | Reduction Of Area (%) | Hardness Brinell | Hardness Rockwell |
17-4 PH | H900 | 190,000 | 170,000 | 10 | 40 | 388 | C40 |
H1025 | 155,000 | 145,000 | 12 | 45 | 331 | C35 | |
H1075 | 145,000 | 125,000 | 13 | 45 | 311 | C32 | |
H1150 | 135,000 | 105,000 | 16 | 50 | 277 | C28 | |
H1150-M | 115,000 | 75,000 | 18 | 55 | 255 | C24 | |
H1150-D | 125,000 | 105,000 | 16 | 50 | 255 min – 311 max | C24 – 33 |
Physical Performance
Density | melting point | J/Kg.k | Magnetic | Thermal conductivity | CLTE |
7.78g/m3 | 14000-1440℃ | 502J/(Kg.℃） | Yes | 17～23W/(m·K)（100～500℃） | 10.8～11.36×10⁻⁶/K（20～300℃） |
17-4PH 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:
17-4PH Precipitation Hardening Stainless Steel Plate
17-4PH PH Stainless Steel Sheet
17-4PH High Strength Martensitic Stainless Steel Strip (Hot-rolled or Cold-rolled)
Heat treatable stainless steel available in 17-4PH H900, 17-4PH H1025, 17-4PH H1150 heat treatment conditions (UNS S17400)
Size Range:
Sheet / Strip: 0.2 – 6.0 mm thick × up to 1200 mm wide
Plate: 3.0 – 150 mm thick × up to 3500 mm wide
Length: up to 12000 mm
Surface: Annealed (Condition A), Bright, Ground, Pickled, No.1, 2B
Testing: Chemical analysis (C ≤0.07%, Cr 15‑17.5%, Ni 3‑5%, Cu 3‑5%), tensile test per condition (H900: Rm ≥1310 MPa, Rp0.2 ≥1170 MPa; H1025: Rm ≥1170 MPa, Rp0.2 ≥1070 MPa; H1150: Rm ≥1030 MPa, Rp0.2 ≥860 MPa), elongation (≥6‑10%), hardness (H900: 40‑47 HRC), flattening test (for strip), intergranular corrosion test, dimensional inspection
2. ASTM A564
(Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes)
Type:
17-4PH Heat Treatable Stainless Steel Bar
17-4PH Stainless Steel for High Strength Parts (Round, Square, Hex, Flat)
17-4PH stainless steel for aerospace, valves, shafts, pump components, supplied in H900, H1025, H1150 tempers
Size Range:
Round bar: 5.0 – 355 mm dia (cold drawn or hot rolled)
Hex bar: 4.0 – 100 mm across flats
Flat bar: up to 150 mm thick × 500 mm wide
Length: 2000 – 6000 mm (customised)
Surface: Annealed (Condition A), Bright, Ground, Peeled, Turned
Testing: Chemical analysis, tensile test (per heat treatment condition), hardness (H900: ≥40 HRC, H1150: ≤35 HRC), ultrasonic test (for large diameters), eddy current test (optional), dimensional inspection
Application
(1)Aerospace – 17-4PH stainless steel for aerospace components (landing gear, actuator arms, structural brackets) leverages its high strength (H900: Rm ≥1310 MPa) and good corrosion resistance to withstand extreme flight stresses.
(2)Valves – 17-4PH stainless steel for valves (ball valves, gate valves, pressure relief valves in oil & gas and chemical plants) uses H1025 or H1150 aging to provide dimensional stability, wear resistance, and freedom from galling.
(3)Shafts – 17-4PH stainless steel for shafts (pump shafts, compressor shafts, marine propeller shafts) offers high tensile strength, excellent fatigue resistance, and good corrosion resistance in both fresh and salt water.
(4)Pump components – 17-4PH stainless steel for pump components (impellers, pump housings, wear rings) combines high hardness with toughness, resisting erosion and cavitation even at H900 condition.
(5)High strength parts – 17-4PH stainless steel for high strength parts (fasteners, couplings, gears, nuclear waste handling equipment) delivers reliable performance across all heat treatment conditions, with the H1150 temper providing the best resistance to stress corrosion cracking.
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