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A METHOD OF PRODUCING LOW PHOSPHORUS STEEL CONTAINING BELOW 0.010 PHOSPHORUS FROM HIGH PHOSPHORUS LIQUID STEEL IN BASIC OXYGEN STEELMAKING
A METHOD OF PRODUCING LOW PHOSPHORUS STEEL CONTAINING BELOW 0.010 PHOSPHORUS FROM HIGH PHOSPHORUS LIQUID STEEL IN BASIC OXYGEN STEELMAKING
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机译:在碱性氧气炼钢中由高磷液态钢生产磷含量低于0.010%的低磷钢的方法
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摘要
This invention relates to a method of producing low phosphorus steel containing below 0.010% phosphorus from high phosphorus hot metal charged in a single slag basic oxygen furnace comprising the steps of maintaining a low slag basicity in liquid steel in the range of 2.5 to 2.7 at 1600°C to 1650°C with FeO% in the slag in the range of 10 to 30% mass through additions of measured quantities of calcined lime in pulverized and/or briquetted forms, continuously or in batches upto the completion of melting, maintaining equillbrium phosphorus partion ratio in the range of 280-340 and lower PSUB2OSUB5 activity in the slag in the range of -20.2 to -19.6 in log scale which ensures complete phosphorus removal in the slag upto 99.99% and also prevent any MgO dissolution from the refractory lining in the slag.
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