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以实现汽车车体轻量化、冲撞安全性和耐腐蚀为目的 ,川崎钢铁公司开发了高强度合金化热镀锌钢板 ( GA)。一般来说 ,GA钢板的高强度化是通过在钢中添加较多的合金化元素来实现的 ,但这种方法对合金化热镀锌性和点焊性有较大的影响。本文论述了新开发的 5 90～ 980 MPa级 GA钢板的力学性能和钢板的点焊性。Mo、Ti、Nb等元素是连续热镀锌线热处理中最适宜的强化元素 ,在钢中加入这些元素可在不损失热镀锌性的情况下 ,使力学性能和冲撞安全性达到目前冷轧双相钢的水平。由于碳当量的降低 ,使点焊性能得到提高 ,特别是焊接区的延性比有显著的提高
Kawasaki Steel developed high-strength alloyed hot-dip galvanized steel (GA) for the purpose of weight reduction, collision safety and corrosion resistance. In general, the high strength of GA steel is achieved by adding more alloying elements in the steel, but this method has a great influence on the galvannealing and the spot weldability. This paper discusses the mechanical properties of the newly developed GA steel plate from 5 90 to 980 MPa and the spot weldability of steel plate. Mo, Ti, Nb and other elements are the most suitable strengthening elements in the continuous hot-dip galvanizing line heat treatment. Adding these elements in the steel can achieve the mechanical properties and collision safety of the current cold-rolling without losing the hot-dip galvanizing property Duplex steel level. Due to the decrease of carbon equivalent, the spot welding performance is improved, especially the ductility ratio of welding zone is significantly improved