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Home Material GB T 6478-2001
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Grade ML45
China ISC U40452
Corresponding Standard GB T 6478-2001
Steels for cold heading and cold extruding
Classification Carbon Steel
ML45 Chemical Element Composition Content (%)
Component C Si Mn P S Cr * Ni * Cu *
Minimum Value 0.42 - 0.3 - - - - -
Maximum Value 0.5 0.2 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.
ML45 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
Sample diameter d=25 Normalizing Temperature AC3 + 30~50°C ≥600 ≥355 ≥16 ≥40 Hot Rolled Brinell Hardness HBS
≤229
1 Approximate Comparison Table Cold Heading Steel
China Taiwan, China Japan South Korea United States International Organization for Standardization Germany France Russia
GB ISC CNS JIS KS ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST
ML45 U40452 SWRCH45K SWRCH45K SWRCH45K 1044 G10440 CE45E4
(C6) 		Cq45
(C45C) 		1.1192 XC45 45
2 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
QML45 ML45 SWRCH45K 1045 C45EC C45EC
ML45 Corresponding Standards(Same grade name, different standards)
1 GB T 6478-2001
ML45 U40452
2 GB /T 6478-2015
ML45 U40452
3 GB /T 5953-1999
ML45
4 GB /T 28906-2012
ML45 U40452
5 GB /T 5953.1-2009
ML45
6 GB /T 28906-2025
ML45 U40452

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