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Production method of ultra-low sulfur IF steel

A production method, ultra-low sulfur technology, applied in the field of iron and steel metallurgy, can solve the problems of increasing the production cost of steelmaking, prolonging the vacuum treatment time, and affecting the production rhythm, so as to improve the cleanliness of molten steel, reduce the RH desulfurization process, and reduce the cost. Effect

Active Publication Date: 2018-01-26
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method will prolong the vacuum treatment time by more than 5 minutes, which seriously affects the production rhythm; at the same time, the addition of desulfurizer will greatly increase the production cost of steelmaking, resulting in an increase in product cost

Method used

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  • Production method of ultra-low sulfur IF steel
  • Production method of ultra-low sulfur IF steel
  • Production method of ultra-low sulfur IF steel

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Experimental program
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Effect test

Embodiment 1

[0038] The following method is used to produce ultra-low sulfur IF steel.

[0039] (1) Hot metal pretreatment

[0040] The molten iron before pretreatment satisfies the following conditions: molten iron temperature>1300℃, C≥4.5%, S≤0.06%.

[0041] (2) Converter smelting

[0042] Condition of semi-steel into converter: carbon ≥ 3.5%, temperature > 1280℃, S ≤ 0.003%. The loading capacity is 220-230 tons. The scrap steel does not use slag steel, and uses low-sulfur (S≤0.015%) to clean the scrap steel with an amount of ≤8 tons. Do not use recarburizer to warm up. Argon is blown at the bottom during the whole process of blowing. When the sulfur content of the previous furnace of smelting IF steel is greater than 0.020%, no slag is splashed, and the whole furnace slag is completely drained. See Table 1 for details.

[0043] Table 1 Converter entry conditions

[0044] Melting number

[0045] Requirements for slag adjustment at the converter end point: add 3-5kg / t st...

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Abstract

The invention relates to a production method for IF steel containing ultralow sulfur and belongs to the technical field of ferrous metallurgy. According to the production method, by the adoption of the process of combining hot metal pretreatment desulfuration, converter desulfuration and LF refining and RH refining desulfuration, the desulfuration rate reaches 93% or above from hot metal pretreatment to LF refining, and by means of converter end point carbon, temperature and oxygen activity control, LF and RH process parameter control and other process technological measures, production of the IF steel containing ultralow carbon and ultralow sulfur is realized. Through comprehensive application of the method, production of the finished IF steel containing 0.002% or less of C and 0.004% or less of S is realized. The method is simple, easy to operate, low in production cost and suitable for mass production.

Description

technical field [0001] The invention relates to a production method of ultra-low sulfur IF steel, and belongs to the technical field of iron and steel metallurgy. Background technique [0002] IF steel, that is, ultra-low carbon steel, refers to steel with [C]≤0.005%, and its products are widely used in automobile manufacturing, pop-top can manufacturing and other industries. In order to obtain good deep-drawing performance, high-quality ultra-low carbon steel has extremely high requirements on the control of elements such as C, S, and N in the steel, and the production is very difficult. At present, only a few domestic manufacturers such as Baosteel and Ansteel can produce it. It is difficult to meet the domestic market demand, and large quantities of imports are required every year. Therefore, the development of low-sulfur and ultra-low carbon IF steel plays an important role in improving the viability of enterprises and enhancing their competitiveness under the current s...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C7/10C21C5/28
CPCC21C5/28C21C7/064C21C7/10Y02P10/20
Inventor 张敏曾建华龚洪君冉孟伦李扬州杨森祥杨晓东李平凡彭友全
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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