A579 Grade 61 - ASTM A 579-2004(R2014)

Grade	A579 Grade 61
Corresponding Standard	ASTM A 579-2004(R2014) Standard Specification for Superstrength Alloy Steel Forgings
Classification	Precipitation-Hardening Stainless Steel

A579 Grade 61 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Nb
Minimum Value	-	-	-	-	-	15.5	3	3	0.15
Maximum Value	0.07	1	1	0.025	0.025	17.5	5	5	0.45

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

A579 Grade 61 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	≥1140	≥965	≥12	≥50		≥35
Forgings	≥1240	≥1100	≥10	≥45		/
Forgings	≥1380	≥1240	≥8	≥40		按协议
Forgings；Section size ≤ 200mm		≥965			Annealing ≤375
Forgings；Section size ≤ 200mm		≥1100			Annealing ≤375
Forgings；Section size ≤ 25mm		≥1240			Annealing ≤375

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