公开(公告)号：US20110247715A1

公开(公告)日：2011-10-13

申请号：US13123087

申请日：2009-10-07

申请人： Yashuhide Ishiguro ,  Akio Sato ,  Yasuhisa Shimizu

发明人： Yashuhide Ishiguro ,  Akio Sato ,  Yasuhisa Shimizu

IPC分类号： F16L9/00 ,  B21C37/06

CPC分类号： B21C37/08 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/38

摘要： There is provided a high-strength steel tube having excellent chemical conversion treatability and excellent formability and a method for manufacturing the high-strength steel tube. More specifically, in processing a mother steel sheet containing, on the basis of mass percent, 0.05% or more C, more than 0.7% Si, and 0.8% or more Mn into a pipe shape, the sum total of absolute circumferential surface strains each applied in individual process steps of the processing is 5% or more as nominal strain. A welded steel tube thus manufactured using a steel sheet even containing more than 0.7% Si can have excellent chemical conversion treatability without mechanical grinding or chemical pickling treatment.

摘要翻译： 提供了具有优异的化学转化处理性和优异成型性的高强度钢管和制造高强度钢管的方法。 更具体地说，在以质量％计含有0.05％以上C，超过0.7％Si，0.8％以上Mn的母钢板加工成管状时，将绝对圆周面应变的总和 在加工的各个工艺步骤中应用的标称应变为5％以上。 使用甚至含有大于0.7％的Si的钢板制造的焊接钢管可以在没有机械研磨或化学酸洗处理的情况下具有优异的化学转化处理性。