C55R - ISO 683-1-2016

Grade	C55R
Corresponding Standard	ISO 683-1-2016 Non-alloy steels for quenching and tempering
Classification	Carbon Steel

C55R Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	More
Minimum Value	0.52	0.1	0.6	-	0.02	-	-	-	-	Cr+Mo+Ni≤0.63
Maximum Value	0.6	0.4	0.9	0.025	0.04	0.4	0.4	0.3	0.1	Cr+Mo+Ni≤0.63

C55R Mechanical Properties

	Tensile Strength σ_b Mpa	Yield Point σ_s Mpa	Elongation or Extension Rate δ %	Reduction of Area ψ %
d≤16 or t≤8	800~950	≥550	≥12	≥30
16＜d≤40 or 8＜t≤20	750~900	≥490	≥14	≥35
40＜d≤100 or 20＜t≤60	700~850	≥420	≥15	≥40

C55R Corresponding Standards(Same grade name, different standards)

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