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Grade 15
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
15 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu As
Minimum Value 0.12 0.17 0.35 - - - - - -
Maximum Value 0.19 0.37 0.65 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.
15 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
%
Rolled product ≥370 ≥225 ≥27 ≥55
Rolled product Hard-worked ≥440 ≥8 ≥45
Rolled product Annealed or high-temperature tempered ≥340 ≥23 ≥55
1 Approximate Comparison Table High-Quality Carbon Structural Steel
China Taiwan, China Japan South Korea United States Germany France Russia Sweden United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS DIN EN/DIN W-Nr. NF EN/NF GOST SS BS EN/BS
15 U20152 S15C S15C SM15C 1015 G10150 C15
Ck15 		1.0401
1.1141 		C12
XC15 		15 1350
1370 		040A15
080M15
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 W-Nr. NF EN/NF EN Numerical Grade GOST SS BS EN/BS
15 S15C Gr.1015
Gr.1016 		C15E4 C15
Ck15 		1.1141 C18RR
XC12
XC15 		C15E 1.1141 15 1370 040A15
080M15
CS17
3 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States France Russia United Kingdom
GB JIS ASTM/AISI NF EN/NF GOST BS EN/BS
15 S15C
S15CK 		1015 C15
XC15 		15 040A15
050A15
060A15
4 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan South Korea United States International Organization for Standardization Germany France Russia United Kingdom
GB JIS KS ASTM/AISI ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
15 S15C STKM12B 1015 C15E4 C15C 1.0234 C15C 15 C15C
15 Corresponding Standards(Same grade name, different standards)
1 GB /T 699-1999
15 U20152
2 ISO 4955-2005
(15) X12CrNi23-13
3 GB /T 699-2015
15 U20152
4 GOST 1050-1988
15
5 ISO 683-13-1986
15
6 GB /T 17107-1997
15
7 GB /T 3078-2019
15 15#
8 GB /T 710-2008
15 U20152
9 GB /T 711-2017
15 15#
10 GB /T 13237-2013
15
11 GB 3522-1983
15

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