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Home Material GB T 6478-2001
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Grade ML20Al
China ISC U40208
Corresponding Standard GB T 6478-2001
Steels for cold heading and cold extruding
Classification Carbon Steel
ML20Al Chemical Element Composition Content (%)
Component C Si ® Mn P S Cr * Ni * Cu * Al ⓐ
Minimum Value 0.18 - 0.3 - - - - - 0.02
Maximum Value 0.23 0.1 0.6 0.035 0.035 0.2 0.2 0.2 -
①By agreement between the supplier and the purchaser, other grades of cold heading and cold extrusion steel may be supplied.
②Permissible deviations in the chemical composition of the steel shall comply with the relevant provisions of GB/T 222-1984.
ML20Al Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
% 		Hardness
HBW
Steel Hot Rolling ≤580 ≥45
Steel Annealing ≤490 *
≥63
Sample diameter d=25 Heat Treatment 520~820 ≥320 ≥11 Hot Rolled Brinell Hardness HBS
≤156
1 Approximate Comparison Table
China Japan United States International Organization for Standardization European Standard
GB ISC JIS ASTM ISO EN Numerical Grade
ML20Al U40208 SWRCH20A 1020 CC21A C20C 1.0411
2 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
China Japan International Organization for Standardization European Standard
GB JIS ISO EN Numerical Grade
ML20Al SWRCH22A C20C C20C 1.0411
3 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
China Japan United States International Organization for Standardization European Standard
YB GB JIS ASTM ISO EN
QML20Al ML20Al SWRCH20A 1020 C20E2C C20E2C
4 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
China Japan United States International Organization for Standardization European Standard
GB JIS ASTM ISO EN
ML20Al SWRCH20A 1020 C20E2C C20E2C
ML20Al Corresponding Standards(Same grade name, different standards)
1 GB T 6478-2001
ML20Al U40208
2 GB /T 6478-2015
ML20Al U40208
3 GB /T 28906-2012
ML20Al U40208
4 GB /T 5953.2-2009
ML20Al
5 GB /T 28906-2025
ML20Al U40208

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