近年日本汽车行业为减轻汽车重量和降低成本 ,措施之一是采取液压成形 ( HF) ,并引起关注。由于 HF是钢管加工比较复杂的加工方法 ,新日本制铁公司研究了钢管机械性能对 HF成形性能影响 ,特别是研究 n值和 r值的评价。试验材料取用各种热轧管、冷轧管和部分热处理钢管 ,机械性 In recent years, one of the measures taken by the Japanese automobile industry to reduce vehicle weight and reduce costs is to take hydroforming (HF) and attract attention. Since HF is a more complicated processing method for steel pipe processing, Nippon Steel Corporation has investigated the influence of the mechanical properties of steel pipe on the formability of HF, in particular, the evaluation of n value and r value. Test materials access to a variety of hot-rolled tubes, cold-rolled tubes and some heat-treated steel, mechanical