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Category	Steel
Class	Stainless steel
Type	Precipitation-hardening standard
Designations	United States: AMS 5342 , AMS 5343 , AMS 5344 , AMS 5355 , AMS 5604 , AMS 5622 , AMS 5643 , AMS 5825 , ASME SA564 , ASME SA705 , ASTM A564 , ASTM A693 , ASTM A705 , MIL SPEC MIL-C-24111 , MIL SPEC MIL-S-81506 , MIL SPEC MIL-S-81591 , SAE J467 (17-4PH) , UNS S17400

Composition

Element	Weight %
C	0.07
Mn	1.00
Si	1.00
Cr	15.5-17.5
Ni	3.0-5.0
P	0.04
S	0.03
Cu	3.0-5.0
Nb+Ta	0.15-0.45

Mechanical Properties

Properties	Conditions
T (°C)	Treatment
Density (×1000 kg/m3)	7.7	25
Poisson's Ratio	0.27-0.30	25
Elastic Modulus (GPa)	196	25
Tensile Strength (Mpa)	1070	25	H1025 (bar, plate, sheet, strip)
Yield Strength (Mpa)	1000
Elongation (%)	12
Reduction in Area (%)	45
Hardness (HRC)	35-42	25	H1025 (bar, plate, sheet, strip)

NEW GB Grade: 05Cr17Ni4Cu4Nb
GB Unified Number:S51740
ASTM/ASME Grade:17-4PH
UNS Grade:S17400
EN Grade: 1.4542