info@gescosteel.com
NM400 is one kind of Chinese wear/abrasion resistant steel plates, which is well received in middle east and Africa.
GNEE NM400 wear-resistant steel was hot rolled and then the plates were heat-treated by direct quenching and tempering and reheat quenching and tempering techniques, respectively.
The impact test was carried out with an instrumented impact tester. The micro-structure and fracture surface were investigated by a combination of optical microscopy, transmission electron microscopy and scanning electron microscopy methods.
With high mechanical strength, NM400 is 3 times to 5 times more than common low-alloy steel plates which can significantly improve surface hardness, usually achieved 360 ~ 450HB.
NM 400 Chemical Compositiom | |||||||||||
Plate | C | Si | Mn | P | S | Cr | Ni | Mo | B | CEV | CET |
thickness mm | max % | max % | max % | max % | max % | max % | max % | max % | max % | typv | typv |
3-（8） | 0.15 | 0.7 | 1.6 | 0.025 | 0.01 | 0.3 | 0.25 | 0.25 | 0.004 | 0.33 | 0.23 |
8-20 | 0.15 | 0.7 | 1.6 | 0.025 | 0.01 | 0.5 | 0.25 | 0.25 | 0.004 | 0.37 | 0.27 |
（20）-32 | 0.18 | 0.7 | 1.6 | 0.025 | 0.01 | 1 | 0.25 | 0.25 | 0.004 | 0.48 | 0.29 |
（32）-45 | 0.22 | 0.7 | 1.6 | 0.025 | 0.01 | 1.4 | 0.5 | 0.6 | 0.004 | 0.57 | 0.31 |
（45）-51 | 0.22 | 0.7 | 1.6 | 0.025 | 0.01 | 1.4 | 0.5 | 0.6 | 0.004 | 0.57 | 0.38 |
（51）-80 | 0.27 | 0.7 | 1.6 | 0.025 | 0.01 | 1.4 | 1 | 0.6 | 0.004 | 0.65 | 0.41 |
（80）-130 | 0.32 | 0.7 | 1.6 | 0.025 | 0.01 | 1.4 | 1.5 | 0.6 | 0.004 | 0.73 | 0.48 |
Plate thickness below 4 mm only after special agreement
CEV = C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15
CET = C + （Mn+Mo）/10+( Cr+ Cu)/20+ Ni/40