What is en NM450 equivalent astm material

    
    NM450 steel is a Chinese wear-resistant steel grade, which is equivalent to ASTM A128 Grade B. NM450 forged and cast parts are widely used in steel structures, construction machinery, mining machinery, coal mines and other industries. Its performance is comparable to that of ASTM A128 Grade B, hardness of 48-55 HRC and tensile strength of 1150-1370 MPa.
    
    NM450 steel is an improved wear-resistant steel grade, after quenching, its hardness is usually around 50-54 HRC, and the surface hardness is significantly higher than 60 HRC. NM450 steel has good impact toughness and ductility. It can withstand medium level impact and has good formability. It can be used for engineering components that require high wear resistance.
    
    The microstructure of NM450 steel consists of Martensite, bainite and special carbides. Depending on heat treatment, microstructure and constitution may also include pearlite, a continuous network of ferrite and trace amounts of retained austenite. In comparison with conventional structural steels, its wear resistance is improved by two to four times, and the cost is slightly lower than medium carbon alloy steel. Therefore, it has been widely used in steel structures, construction machinery, mining machinery, coal mines and other industries.
    
    NM450 steel has good weldability. During welding, preheating welding and post-weld heat treatment process are easily implemented. This can also guarantee the mechanical properties of components. Compared to ASTM A128 grade B, NM450 weldment has better wear resistance but slightly lower impact strength.
    
    In conclusion, NM450 is an ultra-high strength steel material with high wear resistance and good impact toughness. It is equivalent to ASTM A128 Grade B. It has a variety of applications such as steel structures, construction machinery, mining machinery, coal mines and other industries. It features good formability, weldability and machinability.