The hardness of NM400 vs mild steel hot rolled

    
    NM400is a wear resistant steel produced by Swedish steel company SSAB. Its extreme hardness makes it ideal for applications that require wear and abrasion resistance, such as parts in the mining, quarrying and construction industries. It is also suitable for use in harsh environments.
    
    Mild steel hot rolled 750 is a type of automobile steel with a low carbon content, high strength, and excellent formability. Compared to other grades of hot rolled steel, mild steel has excellent weldability properties. It is suitable for use in construction, general fabrication, and automotive applications.
    
    NM400is a much harder material than mild steel hot rolled 750, with a hardness of 400 Brinell (HB). In comparison, mild steel has a much lower hardness of around 151 HB. This means that NM400 is significantly more resistant to wear and abrasion than mild steel, making it the steel of choice for applications that are subject to frequent wear and tear. For this reason, NM400 is often used for parts in heavy machinery and construction equipment.
    
    The higher hardness of NM400 compared to mild steel hot rolled 750 means that it has better yield and tensile strength properties. It is also more resistant to electrical charging and corrosion. Mild steel has better formability properties than NM400, and thus is preferred for automotive parts and general fabrication projects.
    
    Overall, NM400 is a much harder, wear-resistant material than mild steel hot rolled 750, while mild steel is preferred where formability is important. Both steels have different properties, which make them more suitable for different applications.