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A kind of steelmaking method of low-sulfur, low-titanium aluminum-containing steel

A technology of aluminum steel and aluminum content, which is applied in the field of steelmaking of low-sulfur, low-titanium and aluminum-containing steel, can solve the problems of increased manufacturing costs and high prices of low-titanium alloys, and achieve improved product quality, considerable economic benefits, and yields stable effect

Active Publication Date: 2019-03-15
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low-titanium alloys are expensive, and there is a problem of increased manufacturing costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The steelmaking method of the present invention is used on the 120t electric furnace process flow of a certain factory, and the steel grade is 50Mn. Its process steps are:

[0033] (1) Requirements for the end point of converter or electric furnace smelting: [C]: 0.08-0.25%; S content is controlled below 0.020%, and Ti content is controlled below 5ppm. At the same time as tapping, start to add carburizer for steelmaking for pre-deoxidation and synchronous carburization operations. The amount of carburizer added is 300kg, and all the addition is completed before 1 / 3 of tapping. When the tapping amount is 1 / 3~1 / 2, add 200kg of lime and 50kg of fluorite. After tapping the steel, turn on the bottom blowing argon for strong stirring, and at the same time add 600kg of silicon-manganese alloy for alloying operation. After 2 minutes, the molten steel is hoisted to the next process.

[0034] (2) After the LF furnace enters the station for gas testing, add 400kg of lime and 50-...

Embodiment 2

[0038] Use steelmaking method of the present invention on the 250t converter flow process of certain factory, steel class is S48C, and its processing step is:

[0039] (1) Requirements for the end point of converter smelting: [C]: 0.08-0.25%; the S content is controlled below 0.020%, and the Ti content is controlled below 5ppm. At the same time as tapping, start to add carburizer for steelmaking for pre-deoxidation and synchronous carburization operations. The amount of carburizer added is 650kg, and all the addition is completed before 1 / 3 of tapping. When the tapping amount is 1 / 3~1 / 2, add 450kg of lime and 150kg of fluorite. After tapping the steel, turn on the bottom blowing argon for strong stirring, and at the same time add 1500kg of silicon-manganese alloy for alloying operation. After 2 minutes, the molten steel is hoisted to the next process.

[0040](2) After the LF furnace enters the station for gas testing, add 600kg of lime and 100-150kg of fluorite while heating...

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PUM

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Abstract

The invention discloses a smelting method of low-sulfur and low-titanium aluminum-containing steel. The smelting method comprises the following steps: (1) smelting molten steel from a primary melting furnace, adding a recarburizer for steel smelting during tapping for preliminary deoxidization and recarburization, and carrying out alloying operation after the completion of tapping, wherein the addition amount of the recarburizer is 0.5-6.0 kg / t steel; (2) performing refining and deoxidization on the molten steel after alloying through an LF (ladle furnace), adjusting the top slag basicity during the refining process to be 1.5-3.0, and enabling the content of TFe to be smaller than or equal to 1.0%; (3) performing RH refining and degassing treatment on the molten steel after refining in the step (2), adding aluminum alloy 3-5 min before breaking, and adjusting the content of aluminum; and (4) casting the molten steel after breaking by adopting the continuous casting process. According to the smelting method of the low-sulfur and low-titanium aluminum-containing steel, the sulphur content in the steel is stably controlled below 0.005%, the titanium content is stably controlled below 0.0020%, the yield of aluminum alloy is stable, and the purposes of reducing the production cost and improving the product quality are achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a steelmaking method for low-sulfur, low-titanium and aluminum-containing steel. Background technique [0002] Sulfur will have adverse effects on the performance of steel. High sulfur content in steel will deteriorate the hot working performance of steel, that is, cause the "hot brittleness" of steel. Titanium affects the fatigue life of steel, and the higher the grade of the product, the more obvious the effect of titanium. Titanium in steel mainly comes from ferroalloys, so optimizing low-titanium alloys is currently the main method for reducing titanium content in iron and steel enterprises. However, low-titanium alloys are expensive and have a problem of increased manufacturing costs. At the same time, for aluminum-containing steel, there is a contradictory relationship between molten steel desulfurization and titanium control to a certain ext...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C21C7/06C21C7/10
CPCC21C7/0087C21C7/06C21C7/10C22C33/06
Inventor 郭俊波沈昶张晓峰潘远望
Owner MAANSHAN IRON & STEEL CO LTD