中文版
Home Material GOST 1050-1988
简体 | 繁體
Grade 55
Corresponding Standard GOST 1050-1988
Sized Bars Made Of High-quality Structural Carbon Steel with A Special Surface Finish
Classification Carbon Steel
Properties Weldability Carburizing Ability
55 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu As
Minimum Value 0.52 0.17 0.5 - - - - - -
Maximum Value 0.6 0.37 0.8 0.035 0.04 0.25 0.3 0.3 0.08
① Identification numbers for steels (depending on degree of deoxidation) shall be used: kn is for rimmed steel; nc is for semi-killed steel; and identification numbers without letters are for killed steels.
②The nitrogen fraction of total mass in basic oxygen steel shall not exceed 0.006 % for light-gage rolled products and strips and 0.008 % for other types of rolled products.
55 Mechanical Properties
product Tensile Strength
σb
Mpa 		Specified Plastic Yield Strength
Rp0.2
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
%
Rolled product ≥650 ≥380 ≥13 ≥35
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
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
55 U20552 S55C S55C SM55C 1055
(ASTM) 		G10550 C55E4 C55E
Ck55 		1.1203 C55E
XC55 		55 1665 C55E
070M55
2 Approximate Comparison Table High-Quality Carbon Structural Steel
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
3 Approximate Comparison Table High-Quality Carbon Structural Steel
Japan United States International Organization for Standardization Germany France European Standard Russia United Kingdom
JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
S55C 1055 C55E4 Ck55 XC54
XC55H1 		C55E 1.1203 55 070M55
4 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
55 Corresponding Standards(Same grade name, different standards)
1 GB /T 699-1999
55 U20552 55#
2 GB /T 699-2015
55 U20552
3 GOST 1050-1988
55
4 GB /T 17107-1997
55
5 GB /T 3078-2019
55 55#
6 GB /T 711-2017
55 55#
7 GB /T 13237-2013
55
8 GB 3522-1983
55

Note: The data is for reference only! If you have any questions, please fill out "I want to correct it"!