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Home Material GB /T 699-2015
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Grade 30
China ISC U20302
Corresponding Standard GB /T 699-2015
Quality Carbon Structure Steels
Classification Carbon Steel
Properties Impact Toughness Machinability Weldability
Density 7.85 g/cm3
30 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.27 0.17 0.5 - - - - -
Maximum Value 0.34 0.37 0.8 0.035 0.035 0.25 0.3 0.25
30 Mechanical Properties
diameter(thickness)
d
mm		 Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
d=25 (Sample size) Normalizing + Quenching + Tempering ≥490 ≥295 ≥21 ≥50 Unprocessed Steel
≤179		 KU2
≥63
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 Carbon Structural Steel and Engineering Steel
China Japan International Organization for Standardization
GB JIS ISO
30 S30C C30
3 Approximate Comparison Table Non-Alloy Steel for Quenching and Tempering
China Japan International Organization for Standardization
GB JIS ISO
30 S30C C30E
4 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
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
6 Approximate Comparison Table High-Quality Carbon Structural Steel
China United Kingdom
GB BS EN/BS
30 080A32
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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