NM450 yog lub siab -lub zog hnav- steel phaj uas yog siv los tiv thaiv lub sijhawm lossis qhov chaw uas yuav tsum tau hnav tsis kam, kom cov khoom siv tau lub neej ntev, txo kev txij nkawm thiab kev poob qis los ntawm kev saib xyuas tsawg dua, thiab sib raug zoo txo cov peev peev.
N yog thawj tsab ntawv pinyin ntawm "resistant" hauv "hnav-resistant".
M yog thawj tsab ntawv pinyin ntawm "hnav" hauv "hnav-resistant".
450 yog Brinell hardness tus nqi HB. (Tus nqi hardness ntawm 450 yog qhov dav dav, thiab tus nqi ntawm NM450 hardness nyob ib ncig ntawm 450.)
Chemical Composition (%):
| Qib Steel | C | Si | Mn | P | S | Cr | Ni | Mo | B |
| NM450 | 0.26 max | 0.70 max | 1.60 max | 0.025 max | 0.015 max | 1.50 max | max 1.00 Nws | 0.50 max | 0.004 max |
Mechanical Properties:
| Qib Steel | YS (MPa) | TS (MPa) | Elongation A5 (%) | Impact Test | Hardness | |
| min | min | min | (degree) | AKV J (min) | HBW | |
| NM450 | 1250 | 1500 | 10 | -20 | 30 | 410-490 |
