A579 Grade 84 - ASTM A 579-2004(R2014)

Grade	A579 Grade 84
Corresponding Standard	ASTM A 579-2004(R2014) Standard Specification for Superstrength Alloy Steel Forgings
Classification	Alloy Steel

A579 Grade 84 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Mo	V	Co	Al
Minimum Value	0.16	-	0.2	-	-	0.65	8.5	0.95	0.06	4.25	-
Maximum Value	0.23	0.2	0.4	0.01	0.005	0.85	9.5	1.1	0.15	4.75	0.02

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

A579 Grade 84 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	≥1275	≥1240	≥14	≥45		≥35
Forgings；Section size ≤ 150mm		≥1240			Annealing ≤341

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