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