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低合金铬钼钒钢是制造大容量汽轮机高压部分铸件的主要钢种。它在535—570℃高温和90大气压下具有较好的热强性;它的缺点是工艺性能不好,容易产生铸造及焊接裂纹,另外高温持久塑性差,在运行中容易产生热疲劳裂纹,因此钼铬钒钢的裂纹是国内外汽轮机制造业和电站十分关注的质量问题之一。 1974年初北京钢铁学院和北京重型电机厂合作研究铬铜钒钢应用稀土解决裂纹问
Low-alloy chrome molybdenum vanadium steel is the main type of high-pressure steam turbine parts for the production of castings. It has good thermal strength under the high temperature of 535-570 ℃ and 90 atm. Its disadvantage is that the process performance is not good, casting and welding cracks are easy to occur. In addition, the high temperature permanent plasticity is poor, thermal fatigue cracking easily occurs during operation, Therefore, the crack of molybdenum, chromium and vanadium steel is one of the quality problems that the steam turbine manufacturing industry and power station are very concerned about at home and abroad. In early 1974, Beijing Institute of Iron and Steel and Beijing Heavy Duty Factory cooperation in the study of chromium-vanadium steel application of rare earth crack problem