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Home Material GB T 6478-2001
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Grade ML40Cr
China ISC A20404
Corresponding Standard GB T 6478-2001
Steels for cold heading and cold extruding
Classification Alloy Steel
ML40Cr Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni * Cu *
Minimum Value 0.38 - 0.6 - - 0.9 - -
Maximum Value 0.45 0.3 0.9 0.035 0.035 1.2 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.
ML40Cr 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 Annealing ≤620 ≥58
Sample diameter d=25 Quenching temperature 820~860°C water or oil quenching, tempering temperature 540~680°C ≥900 ≥660 ≥11
1 Approximate Comparison Table Cold Heading Steel
China United States International Organization for Standardization Germany France Russia United Kingdom
GB ISC ASTM/AISI UNS ISO DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
ML40Cr A20404 5140 G51400 41Cr4E
(C16) 		41Cr4 1.7035 38C4
42C4 		40Х 3/2
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
QML40Cr ML40Cr SCr440 5140 41Cr4 41Cr4
ML40Cr Corresponding Standards(Same grade name, different standards)
1 GB T 6478-2001
ML40Cr A20404
2 GB /T 6478-2015
ML40Cr U20404
3 Q/BQB 517-2018
ML40Cr
4 GB /T 28906-2012
ML40Cr A20404
5 GB /T 5953.1-2009
ML40Cr
6 Q/ASB 234-2018
ML40Cr
7 Q/OHAB 113-2020
ML40Cr
8 GB /T 28906-2025
ML40Cr

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