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Grade 30
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
30 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu As
Minimum Value 0.27 0.17 0.5 - - - - - -
Maximum Value 0.35 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.
30 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 ≥490 ≥295 ≥21 ≥50
Rolled product Hard-worked ≥560 ≥7 ≥35
Rolled product Annealed or high-temperature tempered ≥440 ≥17 ≥45
Sample Hardening+temper KCU: ≥78J/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 United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
30 U20302 S30C S30C SM30C 1030 G10300 C30E4 C30E
Ck30 		1.1178 C30E
SC32 		30 C30E
080M30
2 Approximate Comparison Table Cold Heading Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization France Russia United Kingdom
GB ISC CNS JIS KS ASTM/AISI UNS ISO NF EN/NF GOST BS EN/BS
ML30 U40302 SWRCH30K SWRCH30K SWRCH30K 1030 G10300 CE28E4
(C2) 		XC32
FR33 		30 1/1
3 Approximate Comparison Table High-Quality Carbon Structural Steel
China Japan United States International Organization for Standardization Germany France European Standard Russia United Kingdom
GB JIS SAE ISO DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
30 S30C 1030 C30
C30E4 		C30
Ck30 		1.0528 AF50C30
XC32 		C30 1.0528 30 080M32
En5
4 Approximate Comparison Table Non-Alloy Steel for Quenching and Tempering
Japan International Organization for Standardization Germany France European Standard Russia United Kingdom
JIS ISO DIN EN/DIN NF EN/NF EN Numerical Grade GOST BS EN/BS
S30C C30E4 Ck30 XC32 C30E 1.1178 30 080M30
CS30
5 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
30 		S30C 1030 ISO 630-1:1987
C30
C30E4
C30M2 		C30
XC32 		30 060A30
30 Corresponding Standards(Same grade name, different standards)
1 GB /T 699-1999
30 U20302 30#
2 GB /T 699-2015
30 U20302
3 GOST 1050-1988
30
4 GB /T 17107-1997
30
5 GB /T 3078-2019
30 30#
6 GB /T 710-2008
30 U20302 30#
7 GB /T 711-2017
30 30#
8 HB /Z 136-2000
30
9 GB /T 13237-2013
30
10 GB 3522-1983
30

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