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JFE钢铁公司为汽车车身开发了两种高性能高强度钢板。SFG高强度钢板“SFGHITEN”(super fine grain,超细晶粒),用于侧面板等强调深冲性能的零部件,是一种主要通过晶粒超细化达到高强度,并通过低屈服强度(低YS)、高n值(高应变硬化指数)、高r值(高塑性应变比)来实现高成形性能的超细晶粒型高强度钢板。UNI高强度钢板“UNI HITEN”(uniform unique universal,统一、独特、通用),用于车门、前机盖等部位,这种钢板具有高胀出性能,表面形状品质(抗表面变形性能)优越,冲压成形后的烤漆性能可使强度提高,从而减少板厚,并保证抗凹性能,是低YR(低屈服比)型440MPa级BH烘烤硬化钢板。对这些钢板的特征和特性进行了阐述。
JFE Steel has developed two high-performance, high-strength steel sheets for the bodywork of automobiles. SFG high-strength steel plate “SFGHITEN” (superfine grain) is used for parts that emphasize deep drawing properties such as side plates. It is a type of steel that achieves high strength through grain refinement and passes Low-yield strength (low YS), high n value (high strain hardening index), high r value (high plastic strain ratio) to achieve high formability of ultra-fine grain high strength steel. UNI high strength steel “UNI HITEN” (uniform unique universal) for doors, front covers and other parts, this plate has a high bulging performance, surface shape quality (anti-surface deformation performance ) Superior, baking performance after stamping can increase the intensity, thereby reducing the thickness, and to ensure anti-concave performance, is a low YR (low yield ratio) 440MPa BH bake hardened steel. The characteristics and characteristics of these plates are described.