Composition of Steels

Typical composition of AISI steels.

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

Composition of Steels
Steel	C	Cr	Mn	Mo	Ni	P	S	Si
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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Stainless Steel Pipes - Dimensions and Weights
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Stainless Steels - Identification Tests
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Steels - Endurance Limits and Fatigue Stress
Endurance limits and fatigue stress for steels.

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