| AISI 4137 | |
 | |
| Category | Steel |
| Class | Alloy steel |
| Type | Standard |
| Common Names | Chromium-molybdenum steel |
| Designations |
France: AFNOR 40 CD 4 , AFNOR 42 CD 4 Germany: DIN 1.7225 Italy: UNI 38 CrMo 4 KB , UNI 40 CrMo 4 , UNI G 4O CrMo 4 Japan: JIS SCM 4 , JIS SCM 4 H Sweden: SS 2244 United Kingdom: B.S. 708 A 42 , B.S. 708 M 40 , B.S. 709 M 40 United States: ASTM A322 , ASTM A331 , ASTM A505 , ASTM A519 , ASTM A547 , SAE J404 , SAE J412 , SAE J770 , UNS G41370 |
| Composition | |
| |
| Element | Weight % |
| C | 0.35-0.40 |
| Mn | 0.70-0.90 |
| P | 0.035 (max) |
| S | 0.04 (max) |
| Si | 0.15-0.30 |
| Cr | 0.80-1.10 |
| Mo | 0.15-0.25 |
| Mechanical Properties | |
| |
| Properties | Conditions | ||
| T (°C) | Treatment | ||
| Density (×1000 kg/m3) | 7.7-8.03 | 25 | |
| Poisson's Ratio | 0.27-0.30 | 25 | |
| Elastic Modulus (GPa) | 190-210 | 25 | |
| Thermal Properties | |
| |
