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Home Material GB /T 699-2015
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Grade 50
China ISC U20502
Old Grade
Corresponding Standard GB /T 699-2015
Quality Carbon Structure Steels
Classification Carbon Steel
Properties High Strength High Hardness High Elasticity
Density 7.85 g/cm3
50 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu
Minimum Value 0.47 0.17 0.5 - - - - -
Maximum Value 0.55 0.37 0.8 0.035 0.035 0.25 0.3 0.25
50 Mechanical Properties
diameter(thickness)
d
mm		 Heat Treatment or Condition
Yield Point
σs
Mpa 		Fatigue Limit
Bending σ-1
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW 		Impact Energy Absorption
KV2
J
d=25 (Sample size) Normalizing + Quenching + Tempering ≥630 ≥375 ≥14 ≥40 Unprocessed Steel
≤241		 KU2
≥31
Annealed Steel
≤207
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 Carbon Structural Steel and Engineering Steel
China Japan International Organization for Standardization
GB JIS ISO
50 S50C C50
3 Approximate Comparison Table Non-Alloy Steel for Quenching and Tempering
China Japan International Organization for Standardization European Standard
GB JIS ISO EN Numerical Grade
50 S50C C50E C50E 1.1206
4 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
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
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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