Method for producing free-cutting steel

A production method and composition technology, applied in the field of free-cutting steel production, can solve the problems of reduced machinability, poor machining performance, sticking of knives, etc., and achieve the effect of improving machinability and chip breaking performance

Inactive Publication Date: 2008-05-07
董国瑛
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] At present, iron and steel enterprises mostly use electric arc furnace to produce easy-cut steel. During the smelting process, smelting is carried out according to the composition specified in GB / T8731-1988. Due to the poor control of Mn and S components, the cutting performance of the product is not good. When the cutting speed reaches 600-700 rpm, the machinability will decrease obviously, and problems such as sticking of the tool, large tool wear and low chip breaking rate will occur.

Method used

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specific Embodiment approach

[0007] The electric arc furnace is used for production. Firstly, the S element, which is prone to fluctuations, is controlled. In order to stabilize its content, fire bricks (acid slag) are made. After the S component is stable, add Mn element according to the ratio of Mn:S=3.5, so that the S and Mn in the steel will form complete MnS in proportion, and no other compounds will be produced. During the reduction process, no ferrosilicon powder will be added, and calcium carbide will be used completely. As a reducing agent, the slag condition is always kept yellow-brown to facilitate the stability of S. Finally, chemical analysis is carried out. If the ratio of Mn and S is 3.5, it can be poured into steel ingots. If there is any deviation, fine-tuning of the composition can be cast into steel ingot.

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Abstract

The invention discloses a producing method for free cutting steel, which is characterized in that the invention adopts an electric-arc furnace to smelt metal and adds components of Mn and S into the furnace; wherein, the mass ratio of the Mn and S is 3.5. The invention has the advantages of enabling to reduce the P component in the steel by controlling the content of Mn and S during smelting, and improving the performance of the Machinability and chip breaking, therefore reaching the requirement for high speed cutting steel.

Description

Technical field: [0001] The invention relates to a production method of steel, in particular to a production method of easy-cut steel. Background technique: [0002] At present, iron and steel enterprises mostly use electric arc furnace to produce free-cutting steel. During the smelting process, smelting is carried out according to the composition specified in GB / T8731-1988. Due to the poor control of Mn and S components, the cutting performance of the product is not good. When the cutting speed reaches 600-700 rpm, the machinability will drop significantly, and problems such as sticking of the tool, large tool wear, and low chip breaking rate will appear. Invention content: [0003] Technical problem to be solved by the invention: The technical problem to be solved by the invention is to provide a production method of free-cutting steel, especially a production method of free-cutting steel that can improve the cutting performance of free-cutting steel. [0004] The techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C21C7/064
Inventor 董国瑛
Owner 董国瑛
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