B170P冷轧高强IF钢板的成型性能

Formability of B170P Cold Rolling High Strength IF Steel Plate

高强无间隙原子(IF)钢是在IF钢基础上,通过适当提高磷和锰含量,得到兼具高强度和良好深冲性能的钢板,B170P钢是具有代表性的高强IF钢种之一。通过试验对B170P冷轧高强IF钢板的力学性能、显微组织、织构、成型性能等进行了全面研究,并与深冲用DC04钢板进行了比较。结果表明:B170P钢板与DC04钢板相比,屈服强度增加了42.86%,抗拉强度增加了26.71%,断后伸长率降低了6.21%,应变硬化指数n值和塑性应变比r值基本持平;轧面反极图和取向分布函数(ODF)图可以反映出,B170P钢板具有良好的深冲性能;B170P钢板的成型范围及膨胀性能小于DC04钢板的。

High strengthinter stitial-free （IF） steel which was developed by appropriately increasing the phosphorus and manganese contents on the basis of IF steel, has both high tensile strength and good deep-drawing property. The B170P steel is one of the representative high strength IF steels. The mechanical properties, microstructure, texture and formability of B170P steel plate were studied comprehensively and compared with DC04 deep drawing steel plate. The results show that compared to DC04 steel plate, the yield strength of B170P steel plate increased by 42.86 %, the tensile strength increased by 26.71%, the elongation after fracture decreased hy 6.21%, and the strain hardening index n value and plastic strain ratio r value almost equaled. The rolling surface inverse pole figure and orientation distribution function （ODF） figure showed B170P steel plate had good deep-drawing property. The forming range and expansion property of B170P steel plate were less than those of DC04 steel plate.