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Home Material GB T 6478-2001
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Grade ML15MnB
China ISC A71154
Corresponding Standard GB T 6478-2001
Steels for cold heading and cold extruding
Classification Alloy Steel
ML15MnB Chemical Element Composition Content (%)
Component C ⓑ Si Mn P S Cr * Ni * Cu * B Al ⓐ
Minimum Value 0.14 - 1.2 - - - - - 0.0005 0.02
Maximum Value 0.2 0.3 1.6 0.035 0.035 0.2 0.2 0.2 0.0035 -
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.
ML15MnB 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 quenching, tempering temperature 200~240°C ≥1130 ≥930 ≥9 ≥45
1 Approximate Comparison Table
China Japan United States International Organization for Standardization France
GB ISC JIS ASTM/AISI UNS ISO NF EN/NF
ML15MnB A71154 SWRCHB620 1518 G15180 CE20BG2
(E2) 		20MB5
2 Approximate Comparison Table
China Japan South Korea International Organization for Standardization United Kingdom
GB JIS KS ISO BS EN/BS
ML15MnB SWRCHB620 SWRCHB620 CE20BG2 9/0
3 Approximate Comparison Table
China Japan European Standard
GB ISC JIS EN
ML15MnB
GB/T 6478-2015
GB/T 6478-2001 		A71154 SWRCHB 620
JIS G3508-1 		17MnB4
EN 10263-4-2001
ML15MnB Corresponding Standards(Same grade name, different standards)
1 GB T 6478-2001
ML15MnB A71154
2 GB /T 6478-2015
ML15MnB A71154
3 GB /T 28906-2012
ML15MnB A71154

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