Nb is the element that must be insist in .Cr-Mo-0.V steel submerged arc welding weld metal which is demanded in ASME CODE CASE.
Nb is the element that must be insist in .Cr-Mo-0.V steel submerged arc welding weld metal which is demanded in ASME CODE CASE.
Nb是ASME标准要求的.CrMo0.V钢埋弧焊焊缝中必须添加的元素。