低温钢主要是为了适应能源、石油化工等产业部门的需要而迅速发展起来的一种专用钢。低温钢要求在低温工作条件下具有足够的强度、塑性和韧性,同时应具有良好的加工性能,主要用于制造-20～-269℃低温下工作的焊接结构。低温钢焊接的重点是保证焊缝及热影响区获得足够的低温冲击韧性。焊接时,要选择相匹配的焊材和合适的焊接工艺。 Low-temperature steel is mainly to adapt to the energy, petrochemical and other industrial sectors and the rapid development of a special steel. Low-temperature steels require adequate strength, ductility and toughness at low temperatures and should have good processability. They are mainly used to make welded structures that operate at temperatures from -20 to -269 ° C. Low-temperature steel welding focus is to ensure that the weld and heat affected zone to obtain sufficient low temperature impact toughness. Welding, to choose the right welding consumables and welding process.