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Home Material GB /T 8731-2008
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Grade Y20
China ISC U70200
Corresponding Standard GB /T 8731-2008
Free-Cutting Structural Steel
Classification Carbon Steel
Properties Machinability
Y20 Chemical Element Composition Content (%)
Component C Si Mn P S
Minimum Value 0.17 0.15 0.7 - 0.08
Maximum Value 0.25 0.35 1 0.06 0.15
Y20 Mechanical Properties
diameter
d
mm		 Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
d=20 (Sample Diameter) Hot Rolled Delivery Condition 450~600 ≥20 ≥30 ≤175
d = 8~20 (steel size) Cold Drawn State Delivery 570~785 ≥7 167~217
d > 20 ~ 30 (steel size) Cold Drawn State Delivery 530~745 ≥7 167~217
d > 30 (steel size) Cold Drawn State Delivery 510~705 ≥7 167~217
1 Approximate Comparison Table Free-Cutting Structural Steel
China United States Germany France Russia
GB ISC ASTM/AISI DIN EN/DIN W-Nr. NF EN/NF GOST
Y20 U70202 1120 22S20 1.0724 18MF5 А20
2 Approximate Comparison Table Free-Cutting Structural Steel
China Japan United States Germany France European Standard Russia United Kingdom
GB JIS ASTM DIN EN/DIN W-Nr. NF EN/NF EN Numerical Grade GOST BS EN/BS
Y20 SUM32 1117 15SMn13 1.0725 15SMn13 15SMn13 1.0725 A20 15SMn13

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