Forging process of steel forging

hot rolled steel
Hot rolled steel is to force the hot billet steel through rolls or molds to deform the billet steel and make it into I-beam, angle steel, flat steel, square steel, round steel, pipe, plate, etc. Due to the oxidation at high temperature, the surface shape of hot rolled steel is relatively rough. unless special
Heat treatment process, otherwise when the material is processed, the mechanical properties of hot rolled steel are relatively low due to annealing or normalizing treatment. This material is often used in low carbon structural steel parts such as buildings and racks. Hot-rolled steel materials are also widely used in the manufacture of mechanical parts (such as gears and cams, etc.), generally before proper heat treatment, the shape of the rough rolled parts is irregular, the material is uneven, and does not have the properties of cold-worked materials. Most alloys and steels with carbon content can be formed by hot rolling.

cold rolled steel

The raw material of cold rolled steel is billet steel or hot rolled steel coil. The final shape and size of cold rolled steel is obtained by roll rolling or die drawing of hardened steel at room temperature. Rolls or dies can refine surfaces and materials. Cold working can increase the strength of the part and reduce its ductility, as described in the previous chapters on Mechanical Forming and Hardening Processes. Therefore, cold-rolled steel has lower surface roughness and higher dimensional accuracy than hot-rolled materials. It has increased strength and stiffness, but at the cost of significant internal strains that can

In subsequent machining, welding, heat treatment to release, but will cause deformation. Commonly used cold-rolled steel includes sheet, strip, plate, round steel, square steel, pipe and so on. Structural steel in shapes like I-beams is usually only produced by hot rolling.