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前言18MnMoNb 钢属屈服强度为50公斤/毫米~2 级的可焊高强钢,在压力容器制造中得到了较多的应用。特别是国产第一套30万吨/年大型合成氨设备中大量地使用了该种钢。对于用18MnMoNb 钢制造的大型设备来说,为了消除焊后残余应力,要求进行600℃左右的消除应力退火。在退火过程中,容易出现消除应力裂缝。为此,对18MnMoNb 钢的消除应力裂缝倾向作了一些工作。
Foreword 18MnMoNb steel yield strength of 50 kg / mm ~ 2 can be welded high strength steel, in the manufacture of pressure vessels have been more applications. In particular, the first large-scale production of 300,000 tons / year of large-scale synthetic ammonia equipment made domestically. For large equipment made of 18MnMoNb steel, stress relief annealing of about 600 ° C is required to eliminate post-weld residual stress. In the annealing process, easy to eliminate stress cracks. To this end, 18MnMoNb steel to eliminate stress cracks tend to do some work.