【摘要】 船用发动机曲轴用钢SF690技术要求高,特别是探伤、性能要求极其严格,超声波探伤要≤Φ2mm,相当于电渣钢水平,整体试样强度要求≥730MPa;通过对"电炉+LF+VD+锻制"的工艺试制船用发动机曲轴用钢SF690的论述,指出了合理的冶炼(控Al脱氧)制度与锻造控制制度是试制成功的关键。经过调整、优化生产工艺使产品合格率达到95%。更多还原

【Abstract】 Crankshaft steel SF690 for marine engine is of high technical requirement, especially requirement forultrasonic test and mechanical properties.The UT criterion not more than Φ2mm is required,which is similar to ESRsteel. The strength of the steel sample shall be≥730MPa.After trial production of crankshaft steel SF690 for marine en-gine by adopting the process of EF→LF→VD→Forging, it is concluded that the reasonable smelting regime(Al control,deoxidation) and forging regime are the key points for successful trial production. After improvement of production pro-cess, the qualification rate of products reached 95%.更多还原