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Grade 50
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
50 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu As
Minimum Value 0.47 0.17 0.5 - - - - - -
Maximum Value 0.55 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.
50 Mechanical Properties
product Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Specified Plastic Yield Strength
Rp0.2
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Impact Energy Absorption
KV2
J
Rolled product ≥630 ≥375 ≥14 ≥40
Rolled product Hard-worked ≥660 ≥6 ≥30
Rolled product Annealed or high-temperature tempered ≥560 ≥12 ≥40
Sample Hardening+temper KCU: ≥38J/cm2
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
50 U20502 S50C S50C SM50C 1050 G10500 C50E4 C50E
Ck53 		1.1210 C50E 50 1674 C50E
080M50
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
50 S50C 1049
1050 		C50
C50E4 		C50
Ck50 		XC48H1 C50 1.0540 50 1674 070M50
080M50
3 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
4 Approximate Comparison Table Structural Alloy Steel
Japan International Organization for Standardization Germany France European Standard Russia United Kingdom
JIS ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
SCr440H 41Cr4 41Cr4 1.7035 42C4 41Cr4 1.7035 40KH
45KH
50 		530M40
5 Approximate Comparison Table High-Quality Carbon Structural Steel
Japan United States International Organization for Standardization Germany France European Standard Russia Sweden United Kingdom
JIS ASTM ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST SS BS EN/BS
S50C 1050 C50E4 Ck50 XC50 C50E 1.1206 50 1674 080M50
CS50
6 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
GB/T 699-1999
50 		S50C 1049
1050 		ISO 630-1:1987
C50
C50E4
C50M2 		C50
XC48 		50 060A52
50 Corresponding Standards(Same grade name, different standards)
1 GB /T 699-1999
50 U20502 (50#)
2 GB /T 699-2015
50 U20502 (50#)
3 GOST 1050-1988
50
4 GB /T 17107-1997
50
5 GB /T 3078-2019
50 50#
6 GB /T 710-2008
50 U20502 (50#)
7 GB /T 711-2017
50 50#
8 HB /Z 136-2000
50
9 GB /T 13237-2013
50
10 GB 3522-1983
50

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