Abstract
Abstract The finishing rolling elongation in the non-quenched and tempered Si-Mn steel is theoretically calculated using the covalent electron number n A of the strongest bond in alloying phases and the interface electron density difference Δρ. Calculations show that the finishing rolling elongation of the non-quenched and tempered Si-Mn steel can be achieved by subtractingt all the elongation decremernts of solution strengthening, precipitation strengthening, and interface strengthening from the elongation of the refined α-Fe matrix. The calculated results of the finishing rolling tensile strenght σb, the finishing rolling yield strength σs, and the finishing elongation δo Q345 steel and BG420CL steel agree well with the measured values. Supported by National Natural Science Foundation of China (Grant No. 50471022)
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