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Home Material GB /T 1222-2016
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Grade 70
China ISC U20702
Corresponding Standard GB /T 1222-2016
Spring steels
Classification Spring Steel
Properties Elasticity
70 Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni Cu *
Minimum Value 0.67 0.17 0.5 - - - - -
Maximum Value 0.75 0.37 0.8 0.03 0.03 0.25 0.35 0.25
70 Mechanical Properties
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
Quenching and Tempering ≥1030 ≥835 ≥8 ≥30 -
Hot Rolled (WHR) - - - - ≤285
1 Approximate Comparison Table
China United States International Organization for Standardization France Russia Sweden United Kingdom
GB ISC AISI UNS ISO NF EN/NF GOST SS14 BS EN/BS
70 U20702 1070 G10700 Type DC XC70 70 1778 070A72
2 Approximate Comparison Table
China European Standard Russia Australia
GB EN Numerical Grade GOST Australian Standard AS
70 C70D 1.0615 70 1070
3 Approximate Comparison Table
China United States France Russia United Kingdom
GB ASTM/AISI NF EN/NF GOST BS EN/BS
70
(GB/T 699-1999) 		1069
1070 		C70
XC70 		70 060A72
070A72
4 Approximate Comparison Table
China United States International Organization for Standardization European Standard
GB ISC ASTM/AISI ISO EN Numerical Grade
70
(GB/T 1222-2016) 		U20702 1070
(ASTM A29/A29M:2005) 		DC
(ISO 8458.3:1992) 		C70D
(EN 10016-2:1994) 		1.0615
5 Approximate Comparison Table
China Germany Russia United Kingdom
GB L-Nr. GOST BS EN/BS
70 1.1234 70 080A72
70 Corresponding Standards(Same grade name, different standards)
1 GB /T 699-1999
70 U20702 70#
2 GB /T 699-2015
70 U20702
3 GOST 14959-1979
70
4 GB /T 4358-1995
70 U20702
5 GB /T 1222-2016
70 U20702
6 GB /T 4354-2008
70 U20702 70#
7 GB /T 711-2017
70 70#
8 GB /T 13237-2013
70
9 GB 3522-1983
70

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