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介绍宝钢三期工程建设中开发的细晶粒高强度钢P4 6 0NL1在应用于氧气球罐之前 ,所进行的焊接裂纹试验研究和球罐运行三年后的开罐检查。试验结果表明 :P4 6 0NL1钢不仅具有良好的抗冷裂纹能力 ;而且对再热裂纹不敏感。采用GJB6 0 6RH焊条建造的该钢球罐 ,经三年运行后开罐检查证明 :球罐的总体焊接质量良好
This paper introduces the welding crack test and study of the fine grain high strength steel P4 6 0NL1 developed in Baosteel Phase III Project before its application to oxygen spherical tank and the inspection of open cans after three years operation. The test results show that: P4 6 0NL1 steel not only has good resistance to cold cracking; but also insensitive to reheat cracking. The GJB6 0 6RH electrode construction of the steel ball tank, after three years of operation to open the tank to prove that: the overall quality of the ball tank welding good