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Desulfurization slag system of ultralow-sulfur raw steel and preparation and application methods thereof

An application method, the technology of desulfurization slag, applied in the direction of improving process efficiency, electric furnace, furnace, etc., can solve the problems of narrowing the technical gap and achieve the effect of narrowing the technical gap and effective desulfurization

Active Publication Date: 2011-11-23
宝武特种冶金有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The invention solves the problem of providing qualified raw materials for the development of AerMet100 steel that requires ultra-high purity, thereby being able to significantly narrow the technical gap between my country and developed countries in the field of pure iron metallurgy

Method used

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  • Desulfurization slag system of ultralow-sulfur raw steel and preparation and application methods thereof

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Embodiment Construction

[0062] The chemical composition of the desulfurization slag system of the ultra-low sulfur raw material steel of the present invention includes: 55-75wt% CaO, 10-25wt% CaF 2 And 10~20wt% CaC 2 . When preparing, choose CaF 2 ≥90wt% high-purity super-grade fluorspar, CaO≥90wt% active lime and ensure that it is in a dry state and the particle size is 2 The calcium carbide is mixed evenly.

[0063] When using the desulfurization slag system of the above-mentioned ultra-low sulfur raw material steel, the process route of EF furnace + LFV furnace is adopted, and the specific description is as follows:

[0064] (1) EF furnace: After the furnace charge is fully melted, add active lime and fluorite in batches, and blow oxygen for oxidation treatment. When P≤0.002wt%, Si≤0.05wt% and Mn≤0.05wt%, the oxidation slag is scraped out, And the more thorough the slag removal, the better; the reduction is divided into 2-3 batches, and the ternary component slag is mixed evenly and then added ...

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Abstract

The invention discloses a desulfurization slag system of ultralow-sulfur raw steel and preparation and application methods thereof. The desulfurization slag system is prepared from the following components in percentage by weight: 55-75 percent of CaO, 10-25 percent of CaF2 and 10-20 percent of CaC2. The desulfurization slag system is prepared by mixing fluorite, dry active lime and calcium carbide according to the percentage. The CaO-CaF2-CaC2 slag system is used for desulfurization and deoxidation processing, can simultaneously meet silicon and aluminum requirements, reach higher product indexes and fully satisfy the requirement for secondarily hardening steel. By adopting the invention, ultrahigh-purity pure iron can be prepared by fully utilizing traditional equipment, raw materials are provided for developing AerMet100 steel according with the ultrahigh-purity requirement, and the technical gap between China and developed countries in the world in the field of pure iron metallurgy can be shortened.

Description

technical field [0001] The invention relates to a raw material steel slag system and its preparation and application method, in particular to a desulfurization slag system of ultra-low sulfur raw material steel and its preparation and application method. Background technique [0002] With the development of aviation technology, the quality requirements for aviation materials are getting higher and higher, especially for the landing gear of aircraft, it is required to have ultra-high strength and fracture toughness to reduce weight and improve flight safety. The landing gear of the aircraft usually adopts AerMet100 after secondary hardening, and is smelted in a vacuum induction furnace + vacuum consumable furnace. The chemical composition requirements (wt% ): C ≤ 0.3, Si ≤ 0.05, Mn ≤ 0.10, S ≤ 0.001, P ≤ 0.005, Al ≤ 0.005, Ti ≤ 0.005, this type of ultra-high purity iron has the highest purity requirements at present. [0003] The characteristics of several conventional desul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064C21C5/54
CPCY02P10/20
Inventor 张景海陈新建赵肃武顾雄杨杰
Owner 宝武特种冶金有限公司
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