| Grade | 1.2311，P20 |
| Standard | ASTM A681 |
| Surface | Black; Peeled; Polished; Machined; Grinded; Turned; Milled |
| Raw Materail | POSCO, Baosteel, TISCO, Saky Steel, Outokumpu |
| Country | USA | German | GB/T |
| Standard | ASTM A681 | DIN EN ISO 4957 | GB/T 1299 |
| Grades | P20 | 1.2311 | 3Cr2Mo |
| Standard | Grade | C | Si | Mn | P | S | Cr | Mo |
| ASTM A681 | P20 | 0.28～0.40 | 0.2～0.8 | 0.60～1.0 | ≤0.030 | ≤0.030 | 1.4～2.0 | 0.3～0.55 |
| GB/T 9943 | 3Cr2Mo | 0.28～0.40 | 0.2～0.8 | 0.60～1.0 | ≤0.030 | ≤0.030 | 1.4～2.0 | 0.3～0.55 |
| DIN ISO4957 | 1.2311 | 0.35～0.45 | 0.2～0.4 | 1.3～1.6 | ≤0.030 | ≤0.030 | 1.8～2.1 | 0.15～0.25 |
| Properties | Metric |
| Hardness, Brinell (Typical) | 300 |
| Hardness, Rockwell C (Typical) | 30 |
| Tensile Strength, Ultimate | 965-1030 MPa |
| Tensile Strength, Yield | 827-862 MPa |
| Elongation At Break (In 50 Mm (2″) | 20.00% |
| Compressive Strength | 862 MPa |
| Charpy Impact (V-Notch) | 27.1-33.9 J |
| Poisson’s Ratio | 0.27-0.30 |
| Elastic Modulus | 190-210 GPa |