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SAE
Steel Number		 51B20
Brand/Supplier
South Korea -> POSCO
Classification Alloy Steel
Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ti B
Minimum Value 0.17 0.15 0.7 - - 0.7 0.01 0.0005
Maximum Value 0.22 0.35 0.9 0.03 0.04 0.9 0.05 -
1 Approximate Comparison Table Cold Heading Steel
China United States
GB ASTM
ML20CrB 51B20
2 Approximate Comparison Table Steel for Cold Heading and Cold Extrusion
China United States
YB ASTM
QML20CrB 51B20

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