Alloy steels contain various types of steels whose compositions are more than the limitations of C, Mo, Cr, Va, Mn, Ni, Si, and B assigned for carbon steels. These steels are more responsive to mechanical and heat treatments than carbon steels.
The following datasheet will provide details about AISI 8640 alloy steel.
Chemical Composition
The chemical composition of AISI 8640 alloy steel is outlined in the following table.
| Element | Content (%) |
|---|---|
| Manganese, Mn | 0.75-1.00 |
| Nickel, Ni | 0.40-0.70 |
| Chromium, Cr | 0.40-0.60 |
| Carbon, C | 0.38-0.43 |
| Silicon, Si | 0.15-0.30 |
| Molybdenum, Mo | 0.15-0.25 |
| Sulfur, S | 0.04 (max) |
| Phosphorus, P | 0.035 (max) |
Physical Properties
The following table shows the physical properties of AISI 8640 alloy steel.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.7-8.03 g/cm3 | 0.278-0.290 lb/in3 |
Mechanical Properties
The mechanical properties of AISI 8640 alloy steel are displayed in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
Other Designations
Equivalent materials to AISI 8640 alloy steel are outlined in the table below.
| DIN 1.6546 | UNI 40 NiCrMo 2 KB | B.S. Type 7 | ASTM A322 | ASTM A331 |
| ASTM A506 | ASTM A519 | SAE J404 | SAE J412 | SAE J770 |
| ASTM A29 | ASTM A752 | ASTM A829 | SAE J1397 | MIL SPEC MIL-S-16974 |