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A Method for Preventing Flame Cutting Cracks from Casting Slabs

A flame cutting and casting billet technology, applied in the field of slab continuous casting, can solve the problems of flame cutting surface cracks, affecting rolling use, and having little effect, so as to prevent flame cutting cracks, reduce flame cutting time, and reduce thermal effects. The effect of area thickness

Active Publication Date: 2021-12-03
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The continuous casting slabs of some steel types will have crack defects on the flame cutting surface during the cutting process, which will affect the subsequent rolling use
At present, the measures taken in the industry to suppress crack defects in continuous casting slabs include: improving slab segregation, controlling rolling compression ratio, normalizing heat treatment, strip temperature cutting of steel plates and heat preservation of steel plates, but the above measures are complicated to deal with and have little effect

Method used

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  • A Method for Preventing Flame Cutting Cracks from Casting Slabs

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: Steel type HC420LA, with carbon content of 0.07%, niobium content of 0.05%, silicon content of 0.34%, and manganese content of 1.10%, is cut by double guns. After cutting the billet, the cutting gun first turns off the flame and then stops the operation. The end face of the billet is not cut crack;

Embodiment 2

[0028] Example 2: Steel type HC420LA, with carbon content of 0.06%, niobium content of 0.05%, silicon content of 0.33%, and manganese content of 1.10%, is cut by double guns. After the cutting gun cuts the billet, it first turns off the flame and then stops the operation. The end face of the billet is not cut crack;

Embodiment 3

[0029] Example 3: Steel type M4R22, with carbon content of 0.08%, niobium content of 0.04%, silicon content of 0.46%, and manganese content of 1.15%, is cut by double guns. After the cutting gun cuts the billet, it first turns off the flame and then stops the operation. The end face of the billet is not cut crack.

[0030] Below in conjunction with specific embodiment this scheme is further introduced:

[0031] There are two main reasons for cutting cracks. One is that the temperature of the slab rises during flame cutting, which leads to local phase transformation, and phase transformation stress is generated at this position; the other is the characteristics of the steel type, or the segregation is more serious, resulting in uneven mechanical properties of the slab. Or it is highly sensitive to compositional cracks. This patent mainly solves the cutting cracks of crack-sensitive steel types. The main technical idea is to reduce the thickness of the heat-affected zone of cut...

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Abstract

The present invention provides a method for preventing flame cutting cracks in cast slabs, which is applied to crack-sensitive steel types, including: S1, using a cutting gun to cut the cast slab stably and quickly; S2, after the cutting gun cuts the cast slab, Turn off the flame before stopping the operation. In this scheme, firstly, the billet is cut steadily and quickly by the cutting gun to reduce the flame cutting time, which helps to reduce the thickness of the heat-affected zone at the cutting part, and can also reduce the crack induction when the billet is cut and recrystallized in the melting zone. Element segregation can avoid cutting cracks when the billet is cut; then the cutting gun is turned off first and then stopped in the cutting stage, which is beneficial to avoid the excessive thickness of the local heat-affected zone at the cutting part, thereby avoiding the The casting slab produces cutting cracks after cutting, thus effectively preventing the slab from producing flame cutting cracks.

Description

technical field [0001] The invention relates to the technical field of slab continuous casting, in particular to a method for preventing flame cutting cracks from being generated in cast slabs. Background technique [0002] The continuous casting slabs of some steel types will have crack defects on the flame cutting surface during the cutting process, which will affect the subsequent rolling use. At present, the measures taken in the industry to suppress crack defects in continuous casting slabs include: improving slab segregation, controlling rolling compression ratio, normalizing heat treatment, strip temperature cutting of steel plates and heat preservation of steel plates, but the above measures are complicated to deal with and have little effect . Contents of the invention [0003] In view of this, the present invention provides a method for preventing flame cutting cracks in the slab, which can effectively reduce the thickness of the heat-affected zone at the cuttin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/126C22C38/02C22C38/04C22C38/12
CPCB22D11/126C22C38/02C22C38/04C22C38/12
Inventor 陈刚黄基红徐倩
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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