介绍了在包钢CSP生产线研制540MPa级热轧双相钢的工业化生产试验。采用C—Mn钢为原料，分别利用原层流冷却能力和超快冷设备，通过控制轧制和控制冷却工艺，成功开发出540MPa级热轧双相钢160t。试制的钢带具有屈服强度低、屈强比小、伸长率大、n值高及低温冲击韧性良好等特点，并具有拉伸曲线无屈服平台、马氏体呈岛状均匀分布在铁素体晶界上等典型双相钢的特征。经汽车制造厂试用，制成了汽车横梁和重型翻斗车护板等构件
Abstract:
Pilot production of 540 MPa hot rolled dual-phase strip at Baotou CSP Plant is introduced. 160 t 540 MPa C-Mn hot rolled dual-phase strip was produced by controlled rolling and controlled cooling using laminar cooling and UFC（ultra-fast cooling） equipment. The strips have low yield stress, small yield ratio, high elongation, high n-value and good low temperature impact toughness. No yield point on the tensile curve is observed, the island martensite is distributed among the ferrite grain boundaries uniformly. The produced dual-phase steel was used for making beam and frame cover of heavy-duty truck at the automobile manufactory.[著者文摘]
Key words:
CSP; hot rolled dual-phase steel strip; laminar cooling; UFC