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1967年以来,我厂曾相继采用15MnV、15MnVN、14MnMoV、18MnMoNb及14MnMoVN等各种级别的高强度钢制成了一批电站锅炉汽包、中层及高压化工容器。但是,在使用这些低合金高强度钢的过程中,也存在一些不容忽视的问题。其中最突出的矛盾在于正火状态的高强度钢,当其强度达到50公斤/毫米~2以上时,冲击韧性指标往往不能满足要求。特别是用来制造一些0℃以下工作的受压容器时,这些钢材的韧性水
Since 1967, our factory has successively used 15MnV, 15MnVN, 14MnMoV, 18MnMoNb and 14MnMoVN high-strength steels to make a series of power station boiler drums, middle-layer and high-pressure chemical containers. However, there are some problems that can not be ignored in the use of these low-alloy high-strength steels. One of the most prominent contradiction lies in the normalized high-strength steel, when its strength reaches 50 kg / mm ~ 2 above, the impact toughness indicators often can not meet the requirements. Especially for the manufacture of some of the pressure below 0 ℃ containers, the ductile water of these steel