Smelting method of ultra-low boron steel

Abstract

The invention discloses a smelting method of ultra-low boron steel. The smelting method of the ultra-low boron steel comprises a series of processes that the sulfur content of the melted iron put in afurnace is controlled within 0.01% through the melted iron in the furnace, carbon is controlled at a lower amount during tapping in the converter smelting process, roughing slag control of the converter is reduced, boron reduction amount is reduced in the refining stage, and increment of slag material is reduced, and the ultra-low boron steel with the boron content below 0.0005% is smelted. Compared with the prior art, the smelting method of the ultra-low boron steel not only reduces the boron content in cupric oxide water as much as possible and reduces the reduction amount of the boron, thus reducing the boron content in the whole smelting process; and as far as possible to reduce the boron content brought by foreign materials, and the produced ultra-low boron steel can meet the development direction of the future steel products.

Description

technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to a method for smelting ultra-low boron steel. Background technique [0002] The steelmaking process needs to control the five main elements in molten steel. Bridge steel has very strict requirements on the boron content in the molten steel smelting process. The original standard is set at less than 0.02%. Boron mainly exists in molten iron, alloys such as silicon-manganese for steelmaking, and various auxiliary materials for steelmaking, and it is an easily oxidizable element. The smelting process of some steel types needs to add boron element, mainly because boron can improve the hardenability of steel during normalizing, which is conducive to the formation of some high-strength steel structures, but theoretical research shows that high boron content not only affects the surface quality of steel, but also Affect the low temperature impact properties of steel. At ...

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Problems solved by technology

The smelting process of some steel types needs to add boron element, mainly because boron can improve the hardenability of steel during normalizing, which is conducive to the formation of some high-strength steel structures, but theoretical research shows that high boron content not only affects the surface quality of steel, but also Affect the low temperature impact properties of steel