钢制压力容器在制造过程中,由于经过弯曲、压力、锤击及焊接等工序,都会产生巨大残余应力。压力容器存在残余应力时,将会引起变形,产生冷裂纹和延迟裂纹。当其在腐蚀介质中工作时,容器极易出现腐蚀裂纹。压力容器一旦破坏,将造成无法估量的损失,因此,对于一定厚度的铁素体钢制压力容器,焊后一定要进行退火清除应力,而整体退火消除应力最为彻底。 Steel pressure vessels in the manufacturing process, due to bending, pressure, hammering and welding processes, will have a huge residual stress. Residual stress in the pressure vessel will cause deformation, resulting in cold cracks and delayed cracks. When it works in corrosive media, the container is prone to corrosion cracking. Once the pressure vessel is destroyed, it will incur an immeasurable loss. Therefore, for a certain thickness of ferritic steel pressure vessel, annealing must be carried out to eliminate stress after welding, and the overall annealing to eliminate the most complete stress.