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Process for producing medium and high carbon steel in sheet billet continuous casting and rolling production

A thin slab continuous casting, medium and high carbon technology, used in metal rolling and other directions, can solve the problems of inactive mold, small mold hot melt, poor melting conditions of mold slag, etc., to avoid internal quality defects and surface defects. Quality defects, surface quality and good size and shape control, the effect of improving product quality and economic benefits

Active Publication Date: 2012-11-14
HEBEI IRON AND STEEL
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Problems solved by technology

Due to the high carbon content of medium-high carbon steel, the solidification area is enlarged, and the center segregation and center porosity are prone to occur during the solidification process of the billet. After rolling, the central part of the coil is prone to delamination; and thermal stress are large, high-temperature thermoplasticity is low, and cracks inside and on the surface of the slab are prone to occur; in addition, the freezing point of medium-high carbon steel is low, the thermal melting amount of the mold is small, and the casting speed of conventional slab continuous casting is low, crystallization The liquid surface of the tool steel is not active, the melting conditions of mold slag are not good, and defects such as slag inclusion and heavy skin are prone to appear on the surface of the slab

Method used

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  • Process for producing medium and high carbon steel in sheet billet continuous casting and rolling production
  • Process for producing medium and high carbon steel in sheet billet continuous casting and rolling production

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Embodiment Construction

[0022] The present invention will be further described below through embodiment.

[0023] In the embodiment, the process flow of thin slab continuous casting and rolling to produce medium and high carbon steel is: blast furnace molten iron→converter operation→LF refining→thin slab continuous casting→heating→rolling→cooling→coiling→finished product.

[0024] Converter 150t, LF refining 150t, thin slab continuous casting width 12500mm thick 70mm, heating adopts 230m tunnel type heating furnace, cooling is laminar flow cooling, and produces steel grades of 40Mn, 50Mn, 65Mn.

[0025] Concrete operation steps and each process technological parameter control are as follows:

[0026] (1) Converter operation process

[0027] a. Molten iron temperature 1350℃, S=0.005%, P=0.12%;

[0028] b. The blowing process takes dephosphorization as the main goal, requires the whole process of slag removal, and the furnace temperature rises steadily;

[0029] c. The position of the final pressure...

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Abstract

The invention relates to a process for producing medium and high carbon steel in sheet billet continuous casting and rolling production, in particular to a process for producing medium and high carbon steel by changing process parameters of all procedures, belonging to the technical field of steel and iron smelting processes. The process is characterized by comprising the following steps of converting operation on blast furnace molten iron, LF (Low Frequency) refining, sheet billet continuous casting, heating, rolling, cooling and coiling to obtain a finished product. The sheet billet continuous casting and rolling process is used for producing the medium and high carbon steel, meets the production requirement by controlling the process parameters of all procedures, overcomes the internalquality defect and the surface quality defect generated in products and improves the product quality and economic benefits.

Description

Technical field: [0001] The invention relates to a process for producing medium-high carbon steel by continuous casting and rolling of thin slabs, in particular a process for producing medium-high carbon steel by changing the process parameters of each process, and belongs to the technical field of iron and steel smelting process. Background technique: [0002] At present, the process flow of medium and high carbon steel is: blast furnace molten iron - converter - LF refining - conventional slab continuous casting - heating - rolling - cooling - coiling - finished product. Due to the high carbon content of medium-high carbon steel, the solidification area is enlarged, and the center segregation and center porosity are prone to occur during the solidification process of the billet. After rolling, the central part of the coil is prone to delamination; and thermal stress are large, high-temperature thermoplasticity is low, and cracks inside and on the surface of the slab are pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C33/04B21B1/46
Inventor 王云阁李梦英杨晓江杨杰齐长发杜洪波张大勇郝常鑫付建军马春红李军明张响李经哲席晓利
Owner HEBEI IRON AND STEEL
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