Description
This steel is classified as a low-carbon alloy and has very high tensile strength and hardness resistance. Due to the exceptional hardness of MO40 steel, it is definitely used in projects where hardness resistance and tensile strength are required.
Although the presence of 1% chromium increases heat resistance, steels that have only chromium as an alloying element are less commonly used. Therefore, by adding molybdenum to chromium steels, impact resistance and wear resistance at identical temperatures improve compared to pure chromium steels. This is because chromium and molybdenum are added to enhance steel’s resistance to creep.
The combination of molybdenum and chromium also improves toughness, especially in thick components. In general, the primary characteristic of chromium-molybdenum steels is their heat resistance up to temperatures of 500-600°C while maintaining strength and wear resistance.
| Grade | 42CrMo4 | (Mo40) |
| Material number. | 1/7225 | |
| C | 0.38-0.45 | |
| Si | MAX 0.40 | |
| Mn | 0.60-0.90 | |
| Cr | 0.90-1.20 | |
| P | MAX 0.025 | |
| S | MAX 0.035 | |
| Ni | – | |
| Cu | – | |
| Other | Mo: 0.15-0.30 | |
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