The Effects of Thermo Mechanical Control Process on the Microstructure and Properties of 10B21 Cold Heading Steel

This study investigates the effects of thermo mechanical control process (TMCP) on the microstructure and properties of 10B21 cold heading steel. The results show that, in the temperature range of 800–900 °C with subsequent appropriate slow cooling processes, the wire drawing temperature has a relatively small impact on its mechanical properties. The tensile strength can remain stable in the range of 489-507 MPa, the elongation can be above 27%, and the reduction in area can reach 68%. Under different process conditions, the material exhibits good cold deformation capabilities, meeting the requirements for 1/3 cold heading. The wire drawing temperature significantly affects the thickness of the oxide scale on the material. When the wire drawing temperature is lowered, the oxide scale thickness can be reduced from 37–51 μm at 900 °C wire drawing to 13-22 μm, catering to the process requirements for different oxide scale removal methods.