Effect of QTB Process on Microstructure and Mechanical Properties of HRB400 Bar
The QTB process of HRB400 was discussed,the microstructure,chemical composition and mechanical properties of HRB400 bar were analyzed. The results show that the microstructures from surface to centre of the tested bar are temper S,F + P + B+ temper S and F+P respectively; the tensile strength and yield strength of the tested bar increase to 84 MPa and 38 MPa respectively. The percentage elongation decreases little. So we can reduce alloying elements content by the QTB process or producing HRB500 with the HRB400 billets to increase economic efficiency.