精密焊接钢管用冷连轧钢带31943-2015-gbt-cd-300.pdf

ICS77.140.50H46中华人民共和国国家标准GB/T31943—2015精密焊接钢管用冷连轧钢带Continuouslycoldrolledsteelstripsforprecisionweldedtub...