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Grade ML20
China ISC U40202
Corresponding Standard GB T 6478-2001
Steels for cold heading and cold extruding
Classification Carbon Steel
ML20 Chemical Element Composition Content (%)
Component C Si Mn P S Cr * Ni * Cu *
Minimum Value 0.18 0.15 0.3 - - - - -
Maximum Value 0.23 0.35 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.
ML20 Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
%
Steel Hot Rolling ≤580 ≥45
Steel Annealing ≤490 *
≥63
Sample diameter d=25 Heat Treatment 520~820 ≥320 ≥11
1 Approximate Comparison Table Cold Heading 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
ML20 U40202 SWRCH20K SWRCH20K SWRCH20K 1020 G10200 CC21A
(A5Al) 		Cq22
(C22C) 		1.1152 XC18
FR20 		20nc 0/4
2 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
China Japan United States International Organization for Standardization Germany European Standard
GB ISC JIS ASTM ISO DIN EN/DIN W-Nr. EN Numerical Grade
ML20 U40202 SWRCH20K 1020 CC21K C20C 1.0411 C20C 1.0411
3 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
China Japan South Korea United States International Organization for Standardization Germany United Kingdom
GB JIS KS ASTM ISO DIN EN/DIN BS EN/BS
ML20 SWRCH20K SWCH20K 1020 CC21A Cp22 0/4
ML20 Corresponding Standards(Same grade name, different standards)
1 GB T 6478-2001
ML20 U40202
2 GB /T 6478-2015
ML20 U40202
3 GB /T 5953-1999
ML20
4 GB /T 28906-2012
ML20 U40202
5 YB /T 5144-2006
ML20
6 GB /T 5953.1-2009
ML20
7 GB /T 5953.2-2009
ML20
8 GB /T 28906-2025
ML20 U40202

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