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本文叙述了在真空铸锭过程中,采用真空碳脱氧的方法,处理碱性平炉冶炼的电站转子钢的试验情况,着重研究了真空碳脱氧处理的碱性平炉钢电站转子锻件的质量。①同酸性平炉冶炼的转子比较,非金属夹杂物含量比大气浇注降低77%,比真空浇注降低27％;②改善了硫化物夹杂的形状和偏析率,沿锻造变形方向,硫化物多呈球形或纺锤形,硫印和点状偏析评级从2～4.5级下降到0～2.5级,③断面收缩率在纵向提高6%,在切向提高13%,在径向提高7％;④冲击韧性在纵向提高6％,在切向提高31％;⑤脆性转变温度从58℃下降到14℃。鉴于碱性平炉能大量去除磷、硫,能提供锑、锡、砷、铅等有害元素非常低的钢液,采用真空碳脱氧后,碱性平炉同碱性电炉一样,能够取代酸性平炉,生产质量稳定的优质、大型电站转子锻件。
In this paper, the vacuum carbon deoxidation process is used to treat the test of the rotary hearth steel produced by the alkaline hearth furnace. The quality of the rotor forgings of the alkaline hearth furnace is studied emphatically. Compared with the smelting rotor in acidic hearth furnace, the content of non-metallic inclusions is reduced by 77% compared with the atmospheric pouring, which is 27% lower than the vacuum pouring. The shape and segregation rate of the sulfide inclusions are improved. Or spindle, sulfur and point-like segregation downgraded from grade 2 to grade 0 to grade 0 to 2.5; ③ the reduction in area was 6% in the machine direction, 13% in the tangential direction and 7% in the radial direction; ④ The impact toughness 6% in the longitudinal direction and 31% in the tangential direction; ⑤ The brittle transition temperature dropped from 58 ° C to 14 ° C. In view of the alkaline open hearth can remove phosphorus, sulfur, can provide antimony, tin, arsenic, lead and other harmful elements is very low liquid steel, using vacuum carbon deoxidation, alkaline hearth furnace with the same, can replace the acid hearth, production Stable quality, large-scale power station rotor forgings.