Smelting method of ultra-low boron steel

A smelting method and ultra-low boron technology, applied in the manufacture of converters, etc., can solve the problems affecting the low-temperature impact performance of steel and the surface quality of steel, and achieve the effects of reducing boron content, reducing the amount of boron reduction, and reducing boron content

Active Publication Date: 2018-06-12
NANYANG HANYE SPECIAL STEEL CO LTD
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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 hi

Method used

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Embodiment

[0012] Example: Smelting of ultra-low boron steel with a boron content of 0.0005%.

[0013] When smelting, follow the steps below:

[0014] 1) The sulfur content of molten iron in the converter is required to be controlled below 0.010% in the process of entering the furnace. This is mainly to reduce the amount of boron reduction caused by desulfurization in the refining process. As we all know, desulfurization in the steelmaking process requires a large amount of slag, high temperature, and high alkalinity , good slag fluidity and low iron oxide content in slag; large amount of slag will inevitably increase the boron content brought by slag; boron is an easily oxidizable element, desulfurization is carried out in a reducing atmosphere, low iron oxide in slag The boron content in the slag will inevitably lead to the reduction of boron, which is extremely easy to increase the boron content in molten steel; therefore, in order to smelt ultra-low boron steel, the sulfur content of...

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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 ...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/06C21C7/064
CPCC21C5/28C21C7/0056C21C7/06C21C7/064
Inventor 许少普赵迪黄红乾刘丹朱先兴
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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