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According to the hot working technology, the calculating formulas of the end roll strength in the automobile cross beam steel have been given in theory with electron structure parameters of the alloying phase and the biphase interface. The relationships among the chemical composition, the end roll grain size and the strength, achieved by calculations, are applied to predetermine the optimal end roll grain size and chemical composition range to satisfy the technical requirements. In the productive process, according to the on the spot result analyzed, the computer can calculate the value of end roll strength quickly, and the on the spot composition can also be adjusted in accordance with the demand until the composition is up to the technical requirements. The forecast is fit for all the non quenched tempered steels.
According to the hot working technology, the calculating formulas of the end roll strength in the automobile cross beam steel have been given in theory with electron structure parameters of the alloying phase and the biphase interface. The relationships among the chemical composition, the end roll grain size and the strength, achieved by calculations, are applied to predetermine the optimal end roll grain size and chemical composition range to satisfy the technical requirements. the computer can calculate the value of end roll strength quickly, and the on the spot composition can also be adjusted in accordance with the demand until the composition is up to the technical requirements. The forecast is fit for all the non quenched tempered steels.