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本文是定量评定目前国内常用的锅炉、压力容器用钢高温裂纹敏感性的研究报告。采用自行研制的HHRL-1型可调拘束高温裂纹试验机对19Mn5、BHW-35、14MnMoV、20g、16Mn、A3等钢种进行了大量试验研究,提出了以临界应变速率CST作为材料结晶裂纹倾向的综合的定量评定指标,给出了各种有关裂纹的定量数据,指出了合金元素及杂质含量、供及状态以及焊接线能量对材料高温裂纹敏感性的影响规律,进而为优化锅炉、压力容器焊接工艺提出了合理化建议。研究结果与生产实际中反映出来的规律有很好的一致性,从而为指导焊接生产提供了科学依据。
This article is a quantitative assessment of the current domestic boiler, pressure vessel steel high temperature cracking sensitivity of the research report. A large number of experimental studies have been conducted on the steel grades 19Mn5, BHW-35, 14MnMoV, 20g, 16Mn, A3 and so on, using the self-developed HHRL-1 adjustable constrained high temperature crack testing machine. The critical strain rate CST The quantitative data of various cracks were given. The influences of alloying elements, impurity content, supply and state, and welding wire energy on the crack susceptibility of the material were pointed out. Then, the optimized parameters of the boiler, pressure vessel Welding process put forward reasonable suggestions. The research results are in good agreement with the laws reflected in the actual production, which provides a scientific basis for guiding the welding production.