Method for controlling edge cracks of peritectic steel containing niobium or boron

A peritectic and steel edge technology, which is applied in the control field of edge cracking of medium and heavy plates, can solve the problems of reducing the amount of trimming of medium and heavy plates and cannot be effectively controlled, so as to reduce the amount of trimming, reduce unqualified products, and improve finished products. rate effect

Active Publication Date: 2012-04-11
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the current continuous casting process cannot effectively control the edge cracking of the corner defect of the niobium-containing or boron-containing peritectic steel billet, and to provide a method of Optimizing the specification and size of continuous casting slabs, controlling the occurrence rate and location of edge cracks in medium-thick steel plates containing niobium and boron, reducing the trimming amount of medium-thick plates, thereby increasing the yield of niobium-containing or boron-containing peritectic steel edges crack method

Method used

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  • Method for controlling edge cracks of peritectic steel containing niobium or boron
  • Method for controlling edge cracks of peritectic steel containing niobium or boron
  • Method for controlling edge cracks of peritectic steel containing niobium or boron

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The final product specifications of the production thickness are: thickness: 25mm, width 5000mm Q370qEZ35 niobium-containing peritectic steel plate edge crack control method, the steps:

[0031] 1) Smelting, and controlling the weight percentages of the following components in the final molten steel: C: 0.14%, Nb: 0.020%;

[0032] 2) Continuous casting into billets;

[0033] 3) Carry out billet selection:

[0034] Since the thickness of the end product is required to be 25mm, that is, ≤40mm, a slab with a thickness of 200mm is selected; the current largest slab width is 2400mm,

[0035] 4) Carry out conventional heating to cast slab;

[0036] 5) Rolling:

[0037] Since the width of the terminal product is required to be 5000mm, that is, the width is ≥3360mm, it is rolled at a total width ratio of 2.08 until the terminal product is rolled;

[0038] 6) Carry out post-processing according to routine.

[0039] This example compares the detection situation:

[0040] ...

Embodiment 2

[0042] The final product specification of production thickness is: thickness: 50mm, width 3200mm Q390GJC niobium-containing peritectic steel plate edge crack control method, the steps:

[0043] 1) Smelting, and controlling the weight percentages of the following components in the final molten steel: C: 0.16%, Nb: 0.035%;

[0044] 2) Continuous casting into billets;

[0045] 3) Carry out billet selection:

[0046]Since the thickness of the end product is required to be 50mm, that is > 40mm ~ ≤ 60mm, a slab with a thickness of 250mm is selected, and the current largest slab width is 2400mm.

[0047] 4) Carry out conventional heating to cast slab;

[0048] 5) Rolling:

[0049] Since the width of the terminal product is required to be 3200mm, that is, the width is ≤3360mm, it is controlled to be rolled at a total width ratio of 1.33 until the terminal product is rolled;

[0050] 6) Carry out post-processing according to routine.

[0051] This example compares the detection si...

Embodiment 3

[0054] The final product specifications of the production thickness are: thickness: 75mm, width 2600mm Q345B niobium-containing peritectic steel plate edge crack control method, the steps:

[0055] 1) Smelting, and controlling the weight percentages of the following components in the final molten steel: C: 0.15%, Nb: 0.025%;

[0056] 2) Continuous casting into billets;

[0057] 3) Carry out billet selection:

[0058] Since the thickness of the end product is required to be 75mm, that is >60mm~≤80mm, a slab with a thickness of 300mm is selected; the width of the slab is selected as 2200mm.

[0059] 4) Carry out conventional heating to cast slab;

[0060] 5) Rolling:

[0061] Since the width of the terminal product is required to be 2600mm, that is, the width is ≤3360mm, it is rolled at a total width ratio of 1.18 until the terminal product is rolled;

[0062] 6) Carry out post-processing according to routine.

[0063] This example compares the detection situation:

[0064...

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Abstract

The invention relates to a method for controlling incidence and generation position of edge cracks of a peritectic steel medium plate containing niobium or boron. The method comprises the following steps: smelting and controlling the contents of the following components in molten steel by weight percent: 0.14-0.17% of C, 0.015-0.035% of Nb or 0.0009-0.0013% of B; continuously casting and forming blanks; selecting the blanks, namely conventionally heating the casting blanks; rolling; and conventionally carrying out post processes. The method can be used for controlling the extension of the edge cracks of the medium plate to the center from angle parts by optimizing the size of the casting blank material under the condition that the existing continuous casting machine equipment and process are not changed, thereby reducing the quantity of disqualified products caused by the edge cracks of the medium plate, reducing the edge cutting amount of the medium plate, and further improving the yield.

Description

technical field [0001] The invention relates to the control of edge cracks in medium-thick plates, in particular to a method for reducing edge cracks by controlling the occurrence rate and location of edge cracks in medium-thick steel plates containing niobium and boron. Background technique [0002] Edge cracks in medium and heavy plates refer to the crack defects in the edge area of ​​medium and heavy plates, mainly including three types of defects: edge longitudinal cracks, edge transverse cracks and edge star cracks. It is a common surface defect of wide and thick plate products. Statistics show that edge cracks in medium and thick plates account for more than 60% of the surface quality defects of medium and thick plates, and the impact on medium and thick plates is different depending on the location where they occur. If the final size of the plate is affected, it is a qualified product; if the edge crack occurs within the planned size of the plate, the product that aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/12B21B1/38
Inventor 张青山夏金魁熊玉彰王国秋黄道昌卜勇曹龙琼宋晓亮朱兆顺熊鹏飞韩光雄李同洪
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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