焊接钢管、防腐螺旋管13323277281
河北天元钢管制造有限公司(1) components produced by large size, complex shape, in most cases its not possible to conduct an overall quenching and tempering at which most of the hot-rolled or normalized condition that: poor requires the steel must have a certain yield strength: yield strength and a certain ratio, while lambs have sufficient plasticity and toughness; (2) most of the bridge structure by cold forming and welding process, therefore, requires sensitivity to cold after the aging. requires strength and toughness of the weld zone of not less than the substrate strength and toughness, excellent welding performance;