C55 - ISO 683-1-2016

Grade	C55
Corresponding Standard	ISO 683-1-2016 Non-alloy steels for quenching and tempering
Classification	Carbon Steel

C55 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu	Mo	More
Minimum Value	0.52	0.1	0.6	-	-	-	-	-	-	Cr+Mo+Ni≤0.63
Maximum Value	0.6	0.4	0.9	0.045	0.045	0.4	0.4	0.3	0.1	Cr+Mo+Ni≤0.63

C55 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

1 Approximate Comparison Table

China	Japan	United States	International Organization for Standardization	Germany	France	European Standard		Russia	Sweden	United Kingdom
GB	JIS	ASTM	ISO	DIN EN/DIN	NF EN/NF	EN	Numerical Grade	GOST	SS	BS EN/BS
C55	S55C	1055	C55 C55E4	C55	AF70C55 C54	C55	1.0535	50 55	1655	070M55 50 En9

2 Approximate Comparison Table

China	Japan	United States	International Organization for Standardization	France	Russia	United Kingdom
GB	JIS	ASTM/AISI	ISO	NF EN/NF	GOST	BS EN/BS
55 (GB/T 699-1999)	S55C	1055	C55 C55E4 C55M2 (ISO 630-1:1987)	C55 XC55	55	060A57 070M55

C55 Corresponding Standards(Same grade name, different standards)

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