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The finishing rolling elongation in the non-quenched and tempered Si-Mn steel is theoretically calculated using the cova lent electron number nA of the strongest bond in alloying phases and the interface electron density difference △ρ. Calculations show that the finishing rolling elongation of the non-quenched and tempered Si-Mn steel can be achieved by subtracting all the elongation decrements 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 strength σb, the finishing rolling yield strength σs, and the finishing elongation δ of Q345 steel and BG420CL steel agree well with the measured values.
The finishing rolling elongation in the non-quenched and tempered Si-Mn steel is theoretically calculated using the cova lent electron number nA 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 subtracting all the elongation decrements 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 strength σb, the finishing rolling yield strength σs, and the finishing elongation δ of Q345 steel and BG420CL steel agree well with the measured values.