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Method for rolling steel ingots into ultra-wide ultra-thick Cr-Mo steel plates

A steel ingot and steel plate technology, which is applied in the rolling field of steel ingots to produce ultra-wide and ultra-thick Cr-Mo steel plates, can solve the problem of gaps and heavy edges, the mechanical properties and processing performance of steel plates are difficult to guarantee, and the ultra-wide and ultra-thick Cr-Mo steel plates are easy Problems such as cracking occur, and the effect of improving the pass rate of rolling is achieved

Inactive Publication Date: 2019-05-17
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The steel used for the head of large-scale petrochemical equipment is usually an ultra-wide and ultra-thick Cr-Mo steel plate. If this type of steel plate is produced by welding small pieces of steel plate, the mechanical properties and processing performance of the steel plate are difficult to guarantee.
However, limited by equipment capacity, the ultra-wide and ultra-thick Cr-Mo steel plates that are rolled close to the width limit of the rolling mill are prone to defects such as cracks, gaps, and heavy edges. Steel rolling method is very important

Method used

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  • Method for rolling steel ingots into ultra-wide ultra-thick Cr-Mo steel plates
  • Method for rolling steel ingots into ultra-wide ultra-thick Cr-Mo steel plates

Examples

Experimental program
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Embodiment 1

[0019] The ultra-wide and ultra-thick Cr-Mo steel plate in this embodiment has a width of 3900 mm and a thickness of 150 mm.

[0020] The rolling method of the steel ingot into a super-wide and super-thick Cr-Mo steel plate in this embodiment includes the steps of billet opening, billet cutting, preheating annealing, rolling, and stacking after rolling. The specific process steps are as follows:

[0021] (1) Steel ingot billet opening process: the steel ingot is heated to 1250°C and kept for 3.5 hours. When billet is opened, the amount of edge extrusion of the vertical roll is 40mm, and the rolling reduction is 15mm;

[0022] (2) Billet cutting process: After billet opening, the billet is warmed to remove the riser and ingot tail, the cutting temperature is 150°C, and the diagonal difference of the billet after cutting is required to be 35mm;

[0023] (3) Preheating annealing process: After cutting, the billet is put into the slow cooling pit for preheating annealing. The preh...

Embodiment 2

[0029] The ultra-wide and ultra-thick Cr-Mo steel plate in this embodiment has a width of 3500 mm and a thickness of 130 mm.

[0030] The rolling method of the steel ingot into a super-wide and super-thick Cr-Mo steel plate in this embodiment includes the steps of billet opening, billet cutting, preheating annealing, rolling, and stacking after rolling. The specific process steps are as follows:

[0031] (1) Steel ingot billet opening process: the steel ingot is heated to 1280°C and kept for 2.5 hours. When billet is opened, the amount of edge extrusion of the vertical roll is 60mm, and the rolling reduction is 30mm;

[0032] (2) Billet cutting process: After billet opening, the billet is warmed to remove the riser and ingot tail, the cutting temperature is 180°C, and the diagonal difference of the billet after cutting is required to be 50mm;

[0033] (3) Preheating annealing process: After cutting, the billet is put into the slow cooling pit for preheating annealing. The preh...

Embodiment 3

[0038] The ultra-wide and ultra-thick Cr-Mo steel plate in this embodiment has a width of 3700 mm and a thickness of 135 mm.

[0039] The rolling method of the steel ingot into a super-wide and super-thick Cr-Mo steel plate in this embodiment includes the steps of billet opening, billet cutting, preheating annealing, rolling, and stacking after rolling. The specific process steps are as follows:

[0040] (1) Steel ingot billet opening process: the steel ingot is heated to 1260°C and kept for 2.9 hours. When billet is billeted, the edge extrusion of the vertical roll is 55mm, and the rolling reduction is 25mm;

[0041] (2) Billet cutting process: After billet opening, the billet is warmed to remove the riser and ingot tail, the cutting temperature is 170°C, and the diagonal difference of the billet after cutting is required to be 40mm;

[0042] (3) Preheating annealing process: After cutting, the billet is put into the slow cooling pit for preheating annealing. The preheating a...

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Abstract

The invention discloses a method for rolling steel ingots into ultra-wide ultra-thick Cr-Mo steel plates. The rolling method comprises the steps of steel ingot cogging, blank cutting, a pre-heating annealing, rolling and post-rolling stacking treatment. According to the rolling method, through reasonable control of technics of steel ingot cogging, blank cutting, pre-heating annealing, rolling thesteel ingots into the steel plates and post-rolling stacking treatment, an ultra-wide ultra-thick Cr-Mo steel plate with the width of 3500-3900mm and the thickness of 130-150mm is produced. The methodimproves the percent of pass of ultra-wide ultra-thick Cr-Mo steel plate rolling obviously, with the percent of pass larger than or equal to 97%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a rolling method for forming an ultra-wide and ultra-thick Cr-Mo steel plate from a steel ingot. Background technique [0002] With the vigorous development of the petrochemical industry in recent years, in response to the national environmental protection policy, many petrochemical project equipment urgently need to be upgraded, and petrochemical equipment is developing in the direction of intensification and large-scale. [0003] The steel used for the head of large-scale petrochemical equipment is usually ultra-wide and ultra-thick Cr-Mo steel plate. If this type of steel plate is produced by welding small pieces of steel plate, the mechanical properties and processing performance of the steel plate cannot be guaranteed. However, limited by equipment capacity, the ultra-wide and ultra-thick Cr-Mo steel plates that are rolled close to the width limit of the rolli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/02B21B1/38
Inventor 李杰龙杰侯敬超袁锦程吴艳阳牛红星尹卫江李样兵顾自有
Owner WUYANG IRON & STEEL