The invention discloses a production method for reducing air hole defects of a casting blank of ultra low carbon enamel steel with C being less than or equal to 0.0030%. A smelting process adopts a low-oxygen smelting mode to reduce generation of inclusions, the RH alloying process is optimized, and the inclusion removing rate is increased; and a low stopper blowing argon flow is adopted, and thecontinuous casting heats are increased on the basis of decreasing the casting blank defect incidence rate. Low-oxygen smelting of the ultra low carbon enamel steel is achieved, molten steel pourability is improved, generation of the air hole defects of the casting blank is reduced, and the surface defect rate of an ultra low carbon enamel steel plate is decreased to be 3% or below.

Production method for reducing air hole defects of casting blank of ultra low carbon enamel steel with C being less than or equal to 0.0030

The invention provides an external refining production method of a steel wire rod for cutting diamond wires. Steel is prepared from chemical components in percent by mass including larger than or equal to 0.80% or smaller than or equal to 1.05% of C, larger than or equal to 0.15% or smaller than or equal to 0.4% of Si, larger than or equal to 0.3% or smaller than or equal to 0.6% of Mn, larger than or equal to 0.1% or smaller than or equal to 0.3% of Cr, smaller than or equal to 0.01% of P, smaller than or equal to 0.01% of S, smaller than or equal to 0.002% of Al, smaller than or equal to 0.001% of Ti, smaller than or equal to 0.003% of N, smaller than or equal to 0.002% of O and the balance Fe and other inevitable impurities. The smelting process of the steel includes the procedures thatdeoxidation alloying is carried out in the steel tapping process of a converter, the surface of molten steel of a steel ladle is fully slagged off after steel tapping is completed, and slagging is carried out after slagging off is completed; component adjusting is carried out in the LF refining process, and first slag adjusting is carried out after the components are arranged in place; second slag adjusting is carried out before the molten steel reaches an RH vacuum furnace, after the RH vacuum furnace is degassed to remove inclusions, the maximum sizes of the inclusions in the obtained molten steel are not larger than 15 micrometers, the ratio of the inclusions with the sizes below 5 micrometers is 95% or above, and the content of the components (CaO+Al2O3) in the inclusions is smaller than or equal to 30 wt%; and finally the steel ladle is transported to a continuous casting platform to be cast.

External refining production method of steel wire rod for cutting diamond wires

The invention discloses a method for modifying deep-drawn steel top slag, and belongs to the technical field of ferrous metallurgy steelmaking processes. According to the method, a two-step modification process is carried out by adopting a process route of KR molten iron pretreatment, converter smelting, RH vacuum treatment and continuous casting, so that the deep-drawn steel final slag componentscan be controlled within the target range of 35-45% of CaO, 30-35% of Al2O3, 5-8% of MgO, less than 10% of SiO2 and less than 4% of T. Fe, the defect of subcutaneous inclusion is effectively reduced,and the degraded product and the rejection rate are reduced.

Method for modifying deep-drawn steel top slag

The invention discloses an external refining method capable of increasing continuous casting heats of ultra-deep drawing cold-rolled enamel steel. The external refining method comprises the following steps: smelting molten iron and waste steel into primarily molten steel; performing first-step modifying on steel ladle slag in an alloy fine-tuning station process; performing decarburization and nitrogen pickup after RH molten steel is circulated, starting to measure oxygen before decarburization starts, adding aluminum particles to perform deoxidizing and alloying after decarburization is ended, and adding a steel ladle slag modifying agent to perform secondary modifying after performing RH vacuum-breaking. The external refining method disclosed by the invention increases continuous casting heats of ultra-deep drawing cold-rolled enamel steel to five-heat casting from three-heat casting with an increase rate of 66.7%, realizes batch, efficient and stable production of ultra-deep drawing cold-rolled enamel steel, and has remarkable economic benefits.

External refining method capable of increasing continuous casting heats of ultra-deep drawing cold-rolled enamel steel

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External refining method capable of increasing continuous casting heats of ultra-deep drawing cold-rolled enamel steel