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为解决高强度高韧性工程机械用型钢质量波动的问题,研究了钢种成分、夹杂物、魏氏组织等对低温冲击韧性的影响。采取适当降低锰和钒含量、使用铝脱氧及整体塞棒包全保护浇铸等措施,并对铸坯加热制度等进行了优化。优化后的产品性能及稳定性显著提高,一次检验合格率100%,屈服强度平均461MPa,抗拉强度平均602MPa,断后伸长率平均22%,-5℃冲击值平均61J,金相组织中魏氏组织基本消除,晶粒度7.5~8.0级。
In order to solve the problem of high strength and high toughness steel for the quality of construction machinery, the influence of steel composition, inclusions and Widmanstalls on low temperature impact toughness was studied. The appropriate measures to reduce manganese and vanadium content, to use aluminum deoxidation and the overall protection of the stopper package, and other measures were optimized, and the slab heating system was optimized. Optimized product performance and stability improved significantly, a test pass rate of 100%, an average yield strength of 461MPa, an average tensile strength of 602MPa, an average elongation of 22%, - 5 ℃ impact on average 61J, the microstructure of Wei The basic elimination of the organization, grain size 7.5 to 8.0 grade.