General Description

17-4PH is a martensitic, precipitation hardening stainless steel with Cu and Nb additions. The grade combines high strength to approximately 316℃, and a moderate level of corrosion resistance.

17-4PH is capable to obtain a wide range of mechanical properties depending on the precipitation or aging temperature. The corrosion resistance of 17-4PH is similar to 304 stainless steel and superior to that of the 400 series martensitic stainless steels.

Applications of 17-4PH include aircraft structural parts, fasteners, pump shafts, valve parts, chemical process equipment and nuclear components.

Chemical Composition

Grade Fe% Ni% Cr% C% Mn% Si% S% Cu% Nb% P%
17-4PH Bal. 3.0-5.0 15.5-17.5 Max 0.07 Max 1.0 Max 1.0 Max 0.03 3.0-5.0 0.15-0.45 Max 0.035


UNS S17400

Werkstoff Nr. 1.4542

AISI 630


17-4PH Bar: ASTM A564

17-4PH Sheet/Plate: ASTM A693

Physical Properties

Density:7.78 g/cm3

Melting Point: 1370°C-1413 °C


Bar, Ground Rod, Sheet/Plate/Strip are available.

Mechanical Properties

Heat Treatment Tensile MPa Yield MPa Elongation % HRC
H900 Min 1314 Min 1177 Min 10 Min 40
H925 Min 1177 Min 1070 Min 10 Min 38
H1025 Min 1070 Min 1000 Min 12 Min 35
H1075 Min 1000 Min 863 Min 13 Min 31
H1150 Min 932 Min 725 Min 16 Min 28

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