Low alloy chromium-molybdenum structural steel for hardening and tempering. Good oil hardenability, good fatigue resistance in the treated condition. Steel widely used in mechanical engineering, for medium to large section parts: shafts, gears
| Annealed | Treated from Ø3 to Ø16 | Treated from Ø16 to Ø40 | |
| Rm Mpa | 880/1080 | 880/1080 | |
| Rp0,2 Mpa | ≥ 740 | ≥ 690 | |
| A % | ≥ 12 | ≥ 12 | |
| Hardness Hb | ≤ 212 | 264/321 | 264/321 |
| Resilience daj/cm2 | ≥ 7 | ≥ 7 |
| C | Si | Mn | S | P | Cr | Ni | Mo |
|
0,22 0,29 |
0,10 0,25 |
0,50 0,80 |
≤ 0,015 |
≤ 0,020 |
0,90 1,20 |
≤ 0,3 |
0,15 0,25 |
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