55 - GB /T 13237-2013

Grade	55
Corresponding Standard	GB /T 13237-2013 Cold rolled quality carbon sturctural steel sheets and strips
Classification	Carbon Steel

55 Chemical Element Composition Content (%)

Component	C	Si	Mn	P	S	Cr	Ni	Cu
Minimum Value	0.52	0.17	0.5	-	-	-	-	-
Maximum Value	0.6	0.37	0.8	0.035	0.035	0.25	0.3	0.25

55 Mechanical Properties

thickness t mm	Tensile Strength σ_b Mpa	Elongation or Extension Rate δ %
1＜t ≤ 1.5	490~610	≥ 11 ①
1.5＜t ≤ 2	490~610	≥ 12 ①
2＜t ≤ 2.5	490~610	≥ 12 ①
t＞2.5	490~610	≥ 13 ①

1 Approximate Comparison Table High-Quality Carbon Structural Steel

China

Taiwan, China

Japan

South Korea

United States

International Organization for Standardization

Germany

France

Russia

Sweden

United Kingdom

ISC

CNS

JIS

ASTM/AISI

UNS

ISO

DIN EN/DIN

W-Nr.

NF EN/NF

GOST

BS EN/BS

U20552

S55C

SM55C

1055
(ASTM)

G10550

C55E4

C55E
Ck55

1.1203

C55E
XC55

1665

C55E
070M55

2 Approximate Comparison Table High-Quality Carbon Structural Steel

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

3 Approximate Comparison Table High-Quality Carbon Structural Steel

China		Japan	United States	International Organization for Standardization	European Standard
GB	ISC	JIS	ASTM/AISI	ISO	EN	Numerical Grade
55 (GB/T 699-2015)	U20552	S55C (JIS G4051:2005) (JIS G3506:2004)	1055 (ASTM A29/A29M:2005)	C55E4 (ISO 683-18:1996)	C55E (EN 10083-1:1991+A1:1996) (EN 10084:1998)	1.1203

4 Approximate Comparison Table High-Quality Carbon Structural Steel

55 Corresponding Standards(Same grade name, different standards)

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