管道焊缝的应力腐蚀及其控制

通过研究管道焊缝应力腐蚀的规律，发现焊缝比母材具有更高的应力腐蚀敏感性，焊缝硬化层越宽，对应力腐蚀越敏感，工作温度越高，应力腐蚀敏感电位区间就越宽。介绍了控制管道钢缝应力腐蚀的控制合金元素、控制焊接工艺、控制介质因素等方法。指出适量加入合金元素可提高管道焊缝的抗应力腐蚀能力。

Stress Corrosion Cracking of Pipeline Steel Welded Joints and Controlling

The inhomogeneity of the structure and capacity of the welded joints is caused by welding. This paper studies the regularity of the stress corrosion cracking of the welded joints. The conclusions are as follows.(1) the stress corrosion susceptibility of the weld beads is higher than the base-metals;(2) the wider the hard layer of the welded joints,the higher the stress corrosion susceptibility of the weld beans;(3) the higher the temperature,the wider the potential range of the materials;(4) putting the just alloy elements into the weld beans can improve the resistance of SCC and (5) it is important to improve the condition of the medium.