Method for producing sulfur free cutting and non-hardened and tempered steel

A non-quenched and tempered steel, production method technology, applied in the direction of improving process efficiency, manufacturing converters, etc., to achieve the effect of good quality and good reflection

Inactive Publication Date: 2005-09-14
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Domestic and foreign invention patents related to non-quenched and tempered steel mainly involve aspects of heating and cooling equipment for obtaining high strength and toughness and non-quenched and tempered steel through optimized composition design. There is no report on the production process of continuous casting-controlled rolling and controlled cooling

Method used

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Embodiment Construction

[0018] The invention relates to a production method of sulfur-containing free-cutting non-quenched and tempered steel converter-refining-continuous casting process, including sulfur-containing molten iron→converter smelting→slag retaining and tapping→ladle deoxidation alloying→LF ladle refining→feeding S line→ Argon blowing at the bottom of the ladle → full protection casting → controlled cooling of the slab → controlled rolling and controlled cooling.

[0019] Converter smelting: high-sulfur molten iron is used as raw material, and there is no need to desulfurize the molten iron outside the furnace. The double slag method is used for smelting, the basicity of the primary slag and the final slag of the converter is strictly controlled, and the dephosphorization and sulfur retention operation of low temperature and high iron oxide is adopted; at the same time, in order to prevent the loss of sulfur element after adding a deoxidizer, when the converter is tapping, Add 300kg / furn...

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Abstract

This invention relates to manufacturing method of sulfurous free machining non- quenched and tempered steel. Desulfurization operation is not used in convertor, residue consumption is reduced, and convertor few residue smelting technology is realized. Appropriate deoxidizer and deoxidation technique is selected and high sulfur steel sulfide inclusion is controlled efficiently to make it tiny, uniform distributing, it realizes innocent treatment of high sulfur steel sulfide inclusion. Sulfur element absorptivity, narrow composition control and inclusion removal is ensured by refining technique and residue system research. The contradiction of reducing oxygen content and ensuring sulfur content is solved and high sulfur steel continuous casting low control problem. Sulfur in steel can be stably controlled to 0.040~0.060% by this invention, the history domestic convertor-refinery-continuous casting-binding and cold control technique can not produce sulfurous free machining non- quenched and tempered steel is changed. The steel quality is good and reaches to convertor-refinery-molded casting-binding and cold control technique level. It has been mass produced, and has good reflection from consumer.

Description

[0001] Field [0002] The invention relates to a production method of sulfur-containing free-cutting non-quenched and tempered steel, which is particularly suitable for the production of sulfur-containing free-cutting non-quenched and tempered steel in converter-refining-continuous casting-controlled rolling and controlled cooling. Background technique [0003] Non-quenched and tempered steel is a new type of energy-saving green structural material that does not require quenching and tempering treatment. Its performance and price ratio are far superior to traditional structural steel. It is used to replace quenched and tempered steel. It has the advantages of energy saving, materials, and simple process. It can reduce environmental pollution, avoid oxidation, decarburization, deformation and cracking. The traditional process of producing sulfur-containing free-cutting non-quenched and tempered steel in China is: electric furnace smelting-refining-die casting-controlled rolling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/00C21D8/00C22C33/00
CPCY02P10/20
Inventor 常开地陈明跃陈京生张惠峰赵焕春刘光明钱凯王全礼周德光王坚杨卫忠王国瑞
Owner SHOUGANG CORPORATION
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