A768 Grade 4 Class 1 - ASTM A768/A768M-2005(R2015)

Grade	A768 Grade 4 Class 1
Corresponding Standard	ASTM A768/A768M-2005(R2015) Standard Specification for Vacuum-Treated 12 % Chromium Alloy Steel Forgings for Turbine Rotors and Shafts
Classification	Alloy Steel

A768 Grade 4 Class 1 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo	V	Al
Minimum Value	0.05	0.3	0.7	-	-	11.25	3.5	0.3	-	-
Maximum Value	0.07	0.5	1	0.015	0.012	12.25	4.25	0.5	0.03	0.03

A768 Grade 4 Class 1 Mechanical Properties

Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Impact Energy Absorption KV2 J
760~965	≥585	≥16	≥45	≥49

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