20g钢板由于具有良好的可焊性和优良的机械性能,正日益广泛地使用在锅炉及压力容器上。但最近在我们的工作中曾出现了这样的问题,即板厚为10～14mm的20g产品焊接试样在进行冷弯试验时,连续地出现开裂,甚出现断裂的反常现象。为什么会出现试样弯曲不合格的现象呢?这个问题正是本文所要解决的。 20g steel is widely used in boilers and pressure vessels because of its good weldability and excellent mechanical properties. But recently in our work there has been such a problem that the plate thickness of 10 ~ 14mm 20g product welded specimens in the cold bending test, the continuous cracking, cracking phenomenon even appeared. Why is there a phenomenon of sample bending failure? This problem is exactly what this article needs to solve.