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 Alloy Structural Steel
1. Property: With major contents of Fe and C, also some alloy elements, such as Si, B, Ti and Mn etc. results in improved heat treat ability, good quench ability and stability.
2. Typical Application: Widely used by automotive, tractor, ship and heavy machinery industries to make various transmission parts and fasteners, i.e. gear and formed utility poles.
3. Steel Types (Series), Content Elements and Mechanical Property
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China
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Equivalent
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Contained Elements
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Mechanical Property
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USA
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Japan
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Germany
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C
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Si
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Mn
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Cr
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Minimum Tension Strength
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Minimum Yield Strength
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Minimum Extension Rate
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Minimum Formability
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Minimum Impact Absorbaility
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20Mn2
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1320
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SMn420
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20Mn6
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0.17-0.24
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0.17-0.37
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1.4-1.8
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785
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590
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10
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40
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47
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30Mn2
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1330
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30Mn5
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0.27-0.34
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0.17-0.37
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1.4-1.8
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785
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635
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12
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45
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63
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45Mn2
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1345
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SMn443
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46Mn7
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0.42-0.49
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0.17-0.37
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1.4-1.8
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885
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735
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10
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45
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47
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40Cr
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5140
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Src440
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41Cr4
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0.37-0.44
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0.17-0.37
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0.50-0.80
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0.80-1.10
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980
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785
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9
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45
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47
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Series and Sizes:
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Alloy Structural Steel
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Series
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Round Rolled
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Rolled Sheet
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Round forgeable
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Square Forgeable
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Stack Forgeable
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Round Cold Draw
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Sizes
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 16 ~ 280
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5-38 X 40-150
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135 ~ 550
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40 X 310
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20-300 X 40-400
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10 ~ 40
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