Solving method for transverse cracking of J55 grade microalloy steel angle

A technology of micro-alloy steel and solution, which is applied in the field of continuous casting slab quality control, to achieve the effects of suppressing the generation of micro-cracks, reducing the generation of bending and straightening cracks, and avoiding the generation of micro-cracks

Inactive Publication Date: 2017-10-24
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The present invention aims at the technical problems existing in the prior art, and provides a solution to the transverse cracking of J55 grade micro-alloyed steel corners. The core mechanism of the method for the quality problem of transverse cracking is to improve the uniformity of the initial solidification shell of the steel by fine-tuning the composition to reduce the generation of micro-cracks in the crystallizer.

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  • Solving method for transverse cracking of J55 grade microalloy steel angle
  • Solving method for transverse cracking of J55 grade microalloy steel angle
  • Solving method for transverse cracking of J55 grade microalloy steel angle

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Embodiment 1

[0031] Embodiment 1: The present invention provides a solution to the transverse cracks at the billet corners of J55 grade steel. The following is a complete description of the implementation cases. The specific methods are as follows:

[0032]During the production of J55 grade steel with a section of 1243×230mm in a steel factory, a large number of transverse cracks appeared at the corners of the billet. The composition range of the molten steel is shown in Attached Table 1:

[0033] Table 1

[0034]

[0035] After adopting the present invention, using the peritectic feature point prediction formula (2) to compare with the actual composition, it can be concluded that the J55 steel with this composition belongs to the peritectic steel. Combining formulas (1)(3)(5), it can be seen that the comprehensive product of the basic content of alloying elements such as C, Mn, Si, Al, Cr and their contribution coefficients to the movement of the peritectic point is relatively large, t...

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Abstract

The invention relates to a method for solving corner transverse cracks of J55 level microalloy steel. For J55 level steel belonging to the peritectic reaction zone, the uniformity of the primary shell is improved by reducing the air gap between the primary shell and the crystallizer, and local coarseness is avoided. The generation of austenite grains can reduce the incidence of corner transverse cracks. For peritectic steel, reducing the δ phase ratio during high-temperature peritectic reaction can reduce the shrinkage of the primary shell in a short period of time, which is conducive to the uniform growth and refinement of the primary solidification structure. On the one hand, it avoids the generation of fine cracks in the crystallizer, and on the other hand, it improves the high-temperature thermoplasticity of the surface structure of the slab.

Description

technical field [0001] The invention relates to a method for solving the transverse cracks at the corners of J55 grade micro-alloy steel, in particular to a method for solving the transverse cracks at the corners of a slab through composition fine-tuning, and belongs to the technical field of continuous casting slab quality control. Background technique [0002] Micro-alloyed high-strength alloy steel is a steel for engineering structures developed rapidly on the basis of ordinary carbon mild steel and ordinary low-alloy high-strength steel in the past 30 years. Its development has become the most successful in the field of steel material research and production technology. one of the models. Due to the microalloying effect of niobium, vanadium, titanium and other elements, microalloyed steel has good strength, toughness, cold and hot formability, weldability and its combined performance, and is widely used in bridges, buildings, ships, vehicles, Engineering structures such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04B22D11/16
CPCC22C33/04B22D11/16
Inventor 江中块李杨周秀丽陆珏钰苏瑞先张家泉倪修华
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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