Alloy structural steel with hardenability, with high elasticity and high strength properties, mostly used for heavy components, reaching over 1560 N/mm2 in small diameters. After softening, the hardness reaches its maximum value. 248 HRB. Another feature of it is its resistance to variable loads and shocks. This material is not suitable for welding and will eventually require additional preheating. Grade 30CrNiMo8 is used in the production of heavy duty parts, shafts and drive shafts, steering shafts, engine crankshafts, screws and components exposed to temperature in the power industry.
| Grade | Chemical composition WT % | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | Cu: | ||
| EN 30CrNiMo8, 1.6580 | 0.26 - 0.34 | 0.3 - 0.6 | Max 0.4 | Max 0.025 | Max 0.035 | 1.8 - 2.2 | 1.8 - 2.2 | 0.3 - 0.5 | - | |
| JIS SNCM431 | 0.26 - 0.34 | 0.3 - 0.6 | 0.17 - 0.37 | Max 0.035 | Max 0.035 | 1.8 - 2.1 | 1.8 - 2.1 | 0.25 - 0.35 | Max 0.2 | |
| AFNOR 30CND8, 30NCD8 | 0.26 - 0.33 | 0.3 - 0.6 | 0.1 - 0.4 | Max 0.030 | Max 0.025 | 1.8 - 2.2 | 1.8 - 2.2 | 0.3 - 0.5 | - | |
| DIN 31CrNiMo8 | 0.27 - 0.34 | 0.3 - 0.6 | 0.1 - 0.4 | Max 0.035 | Max 0.035 | 1.8 - 2.2 | 1.8 - 2.2 | 0.3 - 0.5 | - | |
Softening annealing at a temperature of 640 - 680℃
Normalizing annealing at a temperature of 840 - 860℃
Hardening with cooling in oil at 815 - 845℃
Tempering with cooling in air at 550 - 650℃
3KH3M3F, 30Cr2Ni2Mo, 823M30, 30ChN2MA, 30HN2MA, 30ХН2МА, 30NCD8, 30CND8, 31CrNiMo8, NCMo6 Z, 31CrNiMo8H, 31CrNiMo8HH, 31CrNiMo8HL, SNCM431, 30MoCrNi20, C5432.
| Grade | Shape | Dimensionmm | Qty.kg |
|---|---|---|---|
| 30CrNiMo8 | Round bar | φ115 | 6900 |
| 30CrNiMo8 | Round bar | φ120 | 50107 |
| 30CrNiMo8 | Round bar | Φ135 | 16120 |
| 30CrNiMo8 | Round bar | Φ150 | 3585 |
| 30CrNiMo8 | Round bar | Φ180 | 16695 |
| 30CrNiMo8 | Round bar | Φ220 | 6075 |
| 30CrNiMo8 | Ingot | 860 |
Steel grade
Special steel