The hardness of NM400 steel vs mild steel hot rolled

The hardness of NM400 steel is typically higher than that of mild steel hot rolled, as NM400 is a wear-resistant steel with a hardness of around 400 HBW (Brinell hardness scale). On the other hand, mild steel hot rolled typically has a hardness of around 160-220 HBW. The specific hardness of any steel can vary based on various factors such as the heat treatment applied and the chemical composition of the steel.