Q355NH Chemical composition and mechanical properties of a Chinese grade weathering steel
Q355NH Chemical Composition
| Grage | Chemical Composition(Quality Fraction)/% | |||||||||
| C | Si | Mn | P | S | Cu | Cr | Ni | others | ||
| Q355NH | ≤0 .16 | ≤0 .5 | 0 . 5 ~ 1.5 |
≤0 . 03 | ≤0 . 03 | 0 . 25 ~ 0 . 55 |
0 . 40 ~ 0.80 |
≤0.65 | a , b | |
Q355NH Mechanical properties and processing properties
| Grade | Tensile Test a | 180 °Bending test mandrel diameter | ||||||||||||
| Lower yield strength ReL ≥ | Tensile Strength Rm |
Elongation after fracture A/%≥ | ||||||||||||
| ≤16 | >16 ~40 | >40 ~60 | >60 | ≤16 | >16~40 | >40~60 | >60 | ≤6 | >6 ~16 | >16 | ||||
| Q355NH | 355 | 345 | 335 | 325 | 490 ~ 630 | 22 | 22 | 21 | 20 | a | 2a | 3a | ||
Note: 'a' represents the steel thickness.
When a yield plateau is not evident, Rp0.2 may be used.