热轧免酸洗汽车大梁钢施工适应性研究

Research on the Processing Adaptability of Pickling-free Hot Rolled Steel for Automobile Girder

为了研究免酸洗汽车大梁钢是否与下游企业的施工方式相适应,并满足产品的最终要求,分别从汽车大梁成形、焊接、涂装等过程进行分析与验证。结果表明,冷弯过程试样外表面的氧化铁皮不易脱落,铁皮附着力良好;焊接仅仅对氧化铁皮的厚度与结构有影响,打砂后,焊缝性能满足生产要求,外观形貌与常规流程无明显差异;经阳极电泳涂装的样板在168 h盐雾试验中,表面未出现气泡,加速线双边腐蚀最大宽度为1.5 mm,与酸洗板涂装后耐盐雾腐蚀的效果相当,能够满足涂装耐腐蚀的要求。

The forming,welding and coating processes were analyzed and verified for the automobile girder steel,in order to study whether the pickling-free automobile girder steel was compatible with the production mode of the downstream enterprises and met the final requirements of the products.The results showed that oxide scale was not easy to fall off during the cold bending process,and the adhesion of the scale was good.The welding process only affected the thickness and structure of oxide scale.After sanding,the weld performance could meet the production requirements and the appearance had no significant difference relative to conventional process.After anode electrophoretic-coating followed by168h salt spray test,the bubbles did not appear on the surface and the maximum width for the bilateral corrosion speed line was1.5mm.The effect was similar to the pickling plate after coating for the salt spray corrosion test,which could meet the corrosion resistance requirement for the coating.