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Composition of Steels

Typical composition of AISI steels.

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Typical composition of AISI steels are indicated below. Actual composition depends on class and grade.

Composition of Steels
SteelCCrMnMoNiPSSi
AISI 1018 0.14 - 0.20   0.30 - 0.90          
AISI 1040 0.36 - 0.44   0.60 - 0.90          
AISI 1095 0.90 - 1.04   0.30 - 0.50          
AISI 4023 0.20 - 0.25   0.70 - 0.90 0.20 - 0.30   0.035 0.040 0.15 - 0.30
AISI 4037 0.35 - 0.40   0.70 - 0.90 0.20 - 0.30   0.035 0.040 0.15 - 0.30
AISI 4118 0.18 - 0.23 0.40 - 0.60 0.70 - 0.90 0.08 - 0.15   0.035 0.040 0.15 - 0.30
AISI 4140 0.38 - 0.43 0.80 - 1.10 0.75 - 1.00 0.15 - 0.025   0.035 0.040 0.15 - 0.30
AISI 4161 0.56 - 0.64 0.80 - 1.10 0.75 - 1.10 0.15 - 0.25   0.035 0.040 0.15 - 0.30
AISI 4340 0.38 - 0.43 0.70 - 0.90 0.60 - 0.80 0.20 - 0.30 1.65 - 2.00 0.035 0.040 0.15 - 0.30
AISI 5120 0.17 - 0.22 0.70 - 0.90 0.70 - 0.90     0.035 0.040 0.15 - 0.30
AISI 5140 0.38 - 0.43 0.70 - 0.90 0.71 - 0.90     0.035 0.040 0.15 - 0.30
AISI 8620 0.18 - 0.23 0.40 - 0.60 0.75 - 0.90 0.15 - 0.25 0.40 - 0.70 0.035 0.040 0.15 - 0.30
AISI 8640 0.38 - 0.43 0.40 - 0.60 0.75 - 1.00 0.15 - 0.25 0.40 - 0.70 0.035 0.040 0.15 - 0.30
AISI 8660 0.56 - 0.64 0.40 - 0.60 0.75 - 1.00 0.15 - 0.25 0.40 - 0.70 0.035 0.040 0.15 - 0.30
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