采用100 t电炉→LF精炼炉→VD真空炉→320 mm×480 mm大方坯轻压下连铸-控轧控冷工艺流程,制定了30MnVS钢合理的化学成分,并强化电炉终点控制、LF造白渣脱氧、增氮增硫、夹杂物变性处理和低过热度全保护浇铸等关键生产工艺,开发生产了30MnVS非调质钢,横截面各部位碳质量分数差值(碳偏析)为0.02%,晶粒度为10级,具有优异的强韧性配合和热稳定性,热轧态冲击功大于160 J,在常规锻造加热温度为1160~1200℃正火后保持细晶,屈服强度大于620 MPa,冲击值不小于120 J,伸长率大于20%,显著高于国内传统非调质圆钢.
30MnVS non-quenched and tempered steel for direct cutting is produced by the following processes:100 t electric arc furnace smelting→LF+VD refining→320 mm×480 mm bloom continuous casting with soft reduction-con-trolled rolling and cooling process. The rational chemical composition has been formulated,Other measurements,such as the critical processes of the EAF end-point control,the deoxidization by producing white slag in LF,the addition of nitrogen and sulfur,the modification of sulphide and the casting with full protection at the low overheating temperature, etc. were proposed. The carbon difference on the cross section of steel bar was approximately 0.02%,and the grain size maitained No. 10 grade. Thus,the steel had an excellent combination of strength and toughness,as well as high thermal stability. The impact energy of as rolled steel bar was higher than 160 J. The yield strength was above 620 MPa,the im-pact energy was above 120 J,and the elongation was higher than 20%after normalizing at 1160-1200℃,which were much better than that of normal non-quenched and tempered steel.
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