Italy · UNI
55 NiCrMoV 7 KU
UNI 2955-4:1982 — UNI 2955-4
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.5 | 0.6 | ||
| Cr | 0.65 | 0.9 | ||
| Mn | 0.65 | 0.95 | ||
| Mo | 0.3 | 0.5 | ||
| Ni | 1.5 | 2 | ||
| P | 0.03 | |||
| S | 0.03 | |||
| Si | 0.1 | 0.4 | ||
| V | 0.05 | 0.25 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| bars, HB | 锻件 退火 248 | |||||
| bars, HR | 锻件 淬火及回火 ≤40 |
Heat treatment
| Type | 1 |
|---|---|
| Heat-treatment curve | TTT |
| Heat-treatment curve | Hardness-Tempering |
| Heat-treatment curve | CCT |