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Home Material GB T 6478-2001
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Grade ML30CrMo
China ISC A30304
Corresponding Standard GB T 6478-2001
Steels for cold heading and cold extruding
Classification Alloy Steel
ML30CrMo Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni * Cu * Mo
Minimum Value 0.26 - 0.6 - - 0.8 - - 0.15
Maximum Value 0.34 0.3 0.9 0.035 0.035 1.1 0.2 0.2 0.25
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.
ML30CrMo Mechanical Properties
condition Heat Treatment or Condition
Tensile Strength
σb
Mpa 		Yield Point
σs
Mpa 		Elongation or Extension Rate
δ
% 		Reduction of Area
ψ
%
Sample diameter d=25 Quenching temperature 860~900°C water or oil quenching, tempering temperature 490~590°C ≥930 ≥785 ≥12 ≥50
Approximate Comparison Table
China United States Germany France Russia United Kingdom
GB ISC ASTM/AISI UNS DIN EN/DIN W-Nr. NF EN/NF GOST BS EN/BS
ML30CrMo A30304 4130 G41300 ≈25CrMo4 1.7218 30CD4 30ХМА 9/0
ML30CrMo Corresponding Standards(Same grade name, different standards)
1 GB T 6478-2001
ML30CrMo A30304
2 GB /T 6478-2015
ML30CrMo A30304
3 GB /T 28906-2012
ML30CrMo A30304
4 GB /T 5953.1-2009
ML30CrMo
5 Q/OHAB 113-2020
ML30CrMo

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