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Thick steel plate and rolling method thereof

A thick steel plate, stage rolling technology, applied in the direction of metal rolling, temperature control, etc., can solve the problems of poor center porosity or shrinkage cavity without effective deformation, poor core quality and mechanical properties, etc.

Inactive Publication Date: 2019-09-27
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a rolling method for thick steel plates, which performs instant on-line cooling during the two-stage rolling, so as to solve the problems caused by the lack of effective deformation of the medium-thick steel plates in the prior art due to the central porosity or shrinkage cavity during rolling. The technical problem of poor core quality and mechanical properties; and the purpose of the present invention is to provide a thick steel plate prepared by the rolling method

Method used

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  • Thick steel plate and rolling method thereof
  • Thick steel plate and rolling method thereof
  • Thick steel plate and rolling method thereof

Examples

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Effect test

Embodiment 1

[0084] In this embodiment, four test examples with serial numbers A, B, C, and D are illustrated, and the specific details of this embodiment will be introduced below.

[0085] The selected steel type is Q345B steel, and the continuous casting billet is used. The thickness of the billet is shown in Table 1.

[0086] (1) Blank heating process:

[0087] The billet is heated, and the heating temperature is 1150-1240°C.

[0088] (2) Two-stage rolling and online cooling process in the rolling stage, using two-stage rolling of the billet with two stands, including

[0089] a. Rough rolling stage: the heated billet enters the rough rolling mill for 7 passes of rough rolling to obtain an intermediate billet;

[0090] Among them, the billet enters the first instant cooling device at the exit of the roughing mill after the 1st, 3rd, and 5th rough rolling for on-line cooling during the rough rolling period. After performing single cooling or reciprocating cooling in the first instant c...

Embodiment 2

[0103] The selected steel type is Q345B steel, and the continuous casting billet is used. The thickness of the billet is shown in Table 3.

[0104] (1) Blank heating process:

[0105] The billet is heated, and the heating temperature is 1150-1240°C.

[0106] (2) Two-stage rolling and online cooling process in the rolling stage, using two-stage rolling of the billet with two stands, including

[0107] a. Rough rolling stage: the heated billet enters the rough rolling mill for 7 passes of rough rolling to obtain an intermediate billet;

[0108]Among them, the billet enters the first instant cooling device at the exit of the roughing mill after the 1st, 3rd, and 5th rough rolling for on-line cooling during the rough rolling period. After performing single cooling or reciprocating cooling in the first instant cooling device, Centering on the roller table after the roughing mill, and then return to the roughing mill for the 2nd, 4th, and 6th rough rolling respectively, and enter ...

Embodiment 3

[0119] The selected steel type is Q345B steel, and the continuous casting billet is used. The thickness of the billet is shown in Table 5.

[0120] (1) Blank heating process:

[0121] The billet is heated, and the heating temperature is 1150-1240°C.

[0122] (2) Two-stage rolling and online cooling process in the rolling stage, using two-stage rolling of the billet with two stands, including

[0123] a. Rough rolling stage: the heated billet enters the rough rolling mill for 7 passes of rough rolling to obtain an intermediate billet;

[0124] Among them, the billet enters the first instant cooling device at the exit of the roughing mill after the 1st, 3rd, and 5th rough rolling for on-line cooling during the rough rolling period. After performing single cooling or reciprocating cooling in the first instant cooling device, Centering on the roller table after the roughing mill, then return to the roughing mill for the 2nd, 4th, and 6th rough rolling respectively, after the 7th...

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Abstract

The invention discloses a thick steel plate and a rolling method thereof. The rolling method comprises the procedures of blank heating, two-stage rolling and cooling after rolling which are performed in sequence. The two-stage rolling procedure comprises a rough rolling stage and a precision rolling stage. In the rough rolling stage, a blank is subjected to a plurality of passes of rough rolling. The rolling method further comprises the step that after at least two or an odd number of passes of rough rolling is performed, a rough rolling period online cooling procedure is implemented for the blank. According to the thick steel plate prepared by adopting the rolling method, differential temperature rolling is utilized, a certain temperature difference is formed between the surface layer and the core portion of the blank, the surface layer of the blank is low in temperature and small in deformation during rolling while the core portion of the blank is high in temperature and large in deformation during rolling, porosity and shrinkage cavities of the core portion are effectively rolled, the mass and mechanical performance of the core portion are improved, the flaw detection percent of pass is greatly increased, and meanwhile, the rolling efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, relates to a rolling method of a thick steel plate, and also relates to a thick steel plate prepared by the rolling method. Background technique [0002] During the solidification process of the thick steel plate, due to the large thickness and the instability of heat transfer, the growth rate of the columnar crystals is different. When the liquid steel in the lower part of the bridge is solidified and shrinks, it cannot be replenished by liquid steel and forms central looseness or shrinkage cavity. If these center porosities or shrinkage cavities are not effectively deformed during rolling, rolling cannot be carried out, resulting in poor quality and mechanical properties of the center of the thick steel plate, and a low pass rate of flaw detection. Contents of the invention [0003] The purpose of the present invention is to provide a rolling method for thick steel plates, wh...

Claims

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Application Information

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IPC IPC(8): B21B1/22B21B37/74C21D1/02
CPCB21B1/22B21B37/74C21D1/02
Inventor 镇凡陆春洁邵春娟曲锦波
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE