Standard: GOST 4543
Steel Grade: 40X
Chemical Requirements Composition, max, %
| Elements | 40X – GOST 4543 |
| Carbon | 0.36 – 0.44 |
| Silicon | 0.17 – 0.37 |
| Manganese | 0.50 – 0.80 |
| Chromium | 0.80 – 1.10 |
| Phosphorus | 0.035 |
| Sulfur | 0.035 |
| Copper | 0.30 |
| Nickel | 0.30 |
Tensile, Impact and Hardness Requirements
| Steel Grade | 40X – GOST 4543 |
| Yield Strength, min, N/mm2 | 785 |
| Ultimate Strength,min, N/mm2 | 980 |
| Elongation, min, % | 10 |
| Contraction, min, % | 45 |
| Shock viscosity KCU, J/cm2 | 59 |
| Brinell Hardness Number, max | 217 |