为了减轻汽车自重,降低燃料消耗,提高行车速度,汽车结构用钢板日益向高强度和薄规格方向发展。然而,随着强度的提高,势必带来塑性的降低和成形的困难。近年来,国内外竞相研制的双相钢,兼有高强度和高塑性的良好配合,作为新型冷冲压用高强度低合金钢而特别引人注目。双相钢的特定含义,在于钢在 Ac_1～Ac_3两相区加热,以空冷或水冷得到铁素体和 In order to reduce the weight of vehicles, reduce fuel consumption, improve driving speed, automotive structural steel increasingly to the direction of high strength and thin specifications. However, as the strength increases, it is bound to bring about plasticity reduction and forming difficulties. In recent years, competing dual-phase steel developed both at home and abroad, both with high strength and good plasticity of the good match, as the new high-strength low-alloy cold-stamping with special attention. The specific meaning of dual phase steel is that the steel is heated in the Ac_1-Ac_3 two-phase zone to obtain ferrite and