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针对目前大规格矿用C级圆环链采用贵重合金元素含量高的23MnCrNiMo54进行生产的现状,开发了一种无需轧后退火的新型低成本Mn-Mo系低碳马氏体钢。该钢种采用Mn、Mo合金化为主,添加少量的Cr,并进行Nb微合金化,无贵重元素Ni,对该钢种的CCT曲线和淬透性进行了测定,分析了不同热处理状态微观组织及力学性能,在工业化生产条件下试制了2种规格(26 mm×92 mm、30 mm×108 mm)C级矿用圆环链。结果表明:采用新钢种试制的大规格圆环链产品性能完全满足国家标准的要求,与广泛采用的23MnNiCrMo54钢相比,生产成本显著降低,是具有市场竞争力的大规格圆环链制造材料。
In view of the current production of 23MnCrNiMo54 with large alloying element content, the C-type circular chain for large-scale mining has developed a new low-cost Mn-Mo low-carbon martensitic steel without post-annealing. The steel is mainly composed of Mn and Mo alloying, a small amount of Cr is added, Nb is microalloyed, and the precious metal Ni is not added. The CCT curve and the hardenability of the steel are determined, and microstructures of the steel under different heat treatment conditions are analyzed Tissue and mechanical properties, two kinds of C-class mining circular chain with two specifications (26 mm × 92 mm, 30 mm × 108 mm) were manufactured under industrialized production conditions. The results show that the performance of the large-size annular chain trial made with the new steel products fully meets the requirements of the national standards. Compared with the widely used 23MnNiCrMo54 steel, the production cost is significantly reduced, making it a market-competitive large-size circular chain manufacturing material .