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Low-carbon free-cutting sulfur narrow strip steel and production method thereof

A production method and easy-cutting technology, applied in the field of strip steel production

Active Publication Date: 2018-12-21
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it only studied how to reduce the carbon and oxygen deposits in molten steel during the converter smelting process, and did not study the range in which the carbon and oxygen deposits in molten steel should be controlled in order to avoid the occurrence of subcutaneous bubble defects in the continuous casting process.

Method used

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  • Low-carbon free-cutting sulfur narrow strip steel and production method thereof
  • Low-carbon free-cutting sulfur narrow strip steel and production method thereof
  • Low-carbon free-cutting sulfur narrow strip steel and production method thereof

Examples

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Effect test

Embodiment 1

[0104] A 50t electric furnace smelting-LF refining-continuous casting-620mm narrow strip line process is used to produce low-carbon sulfur-based free-cutting narrow strip steel. The amount of molten iron in the furnace raw materials is 40 tons, and the amount of scrap steel is 10 tons. 100kg of sulfur-iron alloy Add steel scraps into the electric furnace. The electric furnace smelting process mainly carries out decarburization and temperature rise. The end point of the electric furnace smelting is 0.04% C content, P content 0.03%, tapping temperature 1690°C, when the electric furnace tapping reaches 1 / 5, add 2kg / per ton of steel silicon calcium barium for deoxidation, followed by alloying by adding low-carbon ferromanganese and phosphorus ferromanganese along with the steel flow. Immediately after the alloy is finished, add 300kg lightly burned dolomite and 400kg wollastonite along with the steel flow. Control the content of electric furnace slag flowing into the ladle to be ...

Embodiment 2

[0116] A 50t electric furnace smelting-LF refining-continuous casting-620mm narrow strip line process is used to produce low-carbon sulfur-based free-cutting narrow strip steel. The amount of molten iron in the furnace raw materials is 35 tons, and the amount of scrap steel is 15 tons. 80kg of sulfur iron Add steel scraps into the electric furnace. The electric furnace smelting process mainly carries out decarburization and temperature rise. The end point of the electric furnace smelting is 0.05% C content, P content 0.025%, the tapping temperature is 1700°C, and when the electric furnace tapping reaches 1 / 5, add 1.5kg with the steel flow Deoxidize with silicon calcium barium per ton of steel, then add low-carbon ferromanganese and ferrophosphorus for alloying with the steel flow, the addition of low-carbon ferromanganese is 14kg / ton of steel, and the addition of phosphorus ferromanganese is 0.8kg / ton of steel, Manganese is controlled according to the middle upper limit and pho...

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Abstract

The invention belongs to the technical field of production of strip steel of plates, and particularly relates to low-carbon free-cutting sulfur narrow strip steel and a production method thereof. Thelow-carbon free-cutting sulfur narrow strip steel is characterized in that the carbon and oxygen equilibrium in molten steel is controlled to omega [C].omega[O]<=6.5*10<-4>. The invention further provides the production method of the low-carbon free-cutting sulfur narrow strip steel. Under the condition that the carbon and oxygen equilibrium in molten steel is controlled to omega [C].omega[O]<=6.5*10<-4>, subsurface bubbles of a cast blank can be avoided, and the surface quality of the cast blank is improved. In the refining process, the molten steel is deoxidized through a Ca feeding line, sothat CaO inclusions generated in the deoxidization process are small, spindle-shaped MnS can be formed, and thus, the cutability of the steel is improved. Meanwhile, scabbing of a continuous castingnozzle, slag entrapment of a crystallizer, steel leakage during continuous casting and cracks of rolled products are avoided, and the sulfur content and the oxygen content are controlled.

Description

technical field [0001] The invention belongs to the technical field of strip steel production, and in particular relates to a low-carbon sulfur-based free-cutting narrow strip steel and a production method thereof. Background technique [0002] Free-cutting steel is a type of steel that contains a certain amount of one or several elements such as sulfur, phosphorus, lead, calcium, selenium, tellurium, etc., and has good cutting performance. Sulfur-based free-cutting steel accounts for 90% of the total output of free-cutting steel. Sulfur-based free-cutting steel can improve machinability by generating a large amount of MnS inclusions in the steel. Low-carbon sulfur-based free-cutting narrow strip steel is mainly used for making keys and other accessories after cold rolling. Cutting parts are used to make products that have strict requirements on dimensional accuracy and smoothness, and relatively low requirements on mechanical properties. [0003] In the current free-cuttin...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/60C22C33/06C21C7/06B21B1/46
CPCB21B1/46C21C7/06C22C33/06C22C38/02C22C38/04C22C38/60Y02P10/20
Inventor 刘洪银路峰亓福川亓伟伟王晓蕾赵晨光解莹琦郝帅孙建卫王孝科王利王奉县
Owner SHANDONG IRON & STEEL CO LTD
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