A579 Grade 71 - ASTM A 579-2004(R2014)

Grade	A579 Grade 71
Corresponding Standard	ASTM A 579-2004(R2014) Standard Specification for Superstrength Alloy Steel Forgings
Classification	Alloy Steel

A579 Grade 71 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Ni	Mo	Ti	Co	Al
Minimum Value	-	-	-	-	-	17	3	0.15	8	0.05
Maximum Value	0.03	0.1	0.1	0.01	0.01	19	3.5	0.25	9	0.15

① 0.06 calcium, 0.003 boron, and 0.02 zirconium may be added.

A579 Grade 71 Mechanical Properties

	Tensile Strength σ_b Mpa	Specified Plastic Yield Strength Rp_0.2 Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %	Hardness HBW	Impact Energy Absorption KV2 J
Forgings	≥1450	≥1380	≥12	≥55		≥45
Forgings；Section size ≤ 300mm		≥1380			Annealing ≤321

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!