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Flatness Control Method for Rolling Process of High Strength Steel with Thickness Below 6mm

A technology of plate shape control and high-strength steel, which is applied in the field of metallurgy, can solve problems such as irregular deformation and uneven stress, and achieve the effect of preventing temperature drop, preventing the difference between the head and tail of the plate and the middle, and achieving uniformity

Active Publication Date: 2020-11-03
TANGSHAN HEAVY PLATE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of heating and rolling, the invention fully considers the overall temperature uniformity of the cast slab and the intermediate slab, as well as the uniformity of the microstructure state after the phase transformation occurs, and solves the technical problems of the medium-thick plate steel during the rolling process. The problem of uneven stress and irregular deformation due to stress caused by uneven temperature and tissue differences

Method used

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  • Flatness Control Method for Rolling Process of High Strength Steel with Thickness Below 6mm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, the thickness of the high-strength steel plate is 5 mm, and the specification of the continuous casting slab is 100*1800*2800 mm. The plate shape control method of the high-strength steel rolling process includes heating, rough rolling, finish rolling, controlled cooling and thermal straightening processes. The process steps are as follows:

[0035] (1) Heating process: the heating temperature of the slab is 1200°C, the heating time is 8cm / min, the soaking time of the billet is 2.5cm / min, after the heating is completed, the temperature difference of each point of the billet is 25°C;

[0036] (2) Rough rolling process: the starting temperature is 1060°C, the broadening pass of rough rolling is rolled by MAS, the ratio of the height of the wedge section to the thickness of the billet is 1:80, the length of the wedge section is 200mm, and the widening pass is divided into 4 passes. The steel pass is carried out in one direction; after the widening pass,...

Embodiment 2

[0043] In this embodiment, the thickness of the high-strength steel plate is 5mm, and the specification of the continuous casting slab is 100*2100*280mm. The plate shape control method of the high-strength steel rolling process includes heating, rough rolling, finish rolling, controlled cooling and thermal straightening processes. The process steps are as follows:

[0044](1) Heating process: the heating temperature of the slab is 1180°C, the heating time is 10cm / min, the soaking time of the billet is 2.5cm / min, after the heating is completed, the temperature difference of each point of the billet is 22°C;

[0045] (2) Rough rolling process: the starting temperature is 1070°C, the rough rolling and widening passes are rolled by MAS, the ratio of the height of the wedge section to the thickness of the billet is 1:100, the length of the wedge section is 240mm, and the widening pass is divided into 4 passes. The steel pass is carried out in one direction; the longitudinal rolling...

Embodiment 3

[0052] In this embodiment, the thickness of the high-strength steel plate is 4mm, and the specification of the continuous casting slab is 80*1800*2400mm. The plate shape control method of the high-strength steel rolling process includes heating, rough rolling, finish rolling, controlled cooling and thermal straightening processes. The process steps are as follows:

[0053] (1) Heating process: the heating temperature of the slab is 1120°C, the heating time is 11cm / min, the soaking time of the billet is 1.8cm / min, after the heating is completed, the temperature difference of each point of the billet is 18°C;

[0054] (2) Rough rolling process: the starting temperature is 1025°C, the broadening pass of rough rolling is rolled by MAS, the ratio of the height of the wedge section to the thickness of the billet is 1:120, the length of the wedge section is 300mm, and the widening pass is divided into 6 passes. The steel pass is carried out in one direction; after the widening pass, ...

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Abstract

The invention discloses a rolling process plate form control method for high-strength steel with the thickness specification being 6 mm or below. The plate form control method comprises the procedures of heating, rough rolling, finish rolling, controlled cooling and hot straightening. In the heating and rolling processes, the integral temperature uniformity of a casting blank and an intermediate blank and structure state uniformity after phase changes happen are sufficiently considered, and the problems that in the medium-thick plate steel ball rolling process, due to the reason in the aspect of the technology, stress is uneven, stress is generated due to the uneven temperature and the structure difference, and consequently irregular deformation is caused are solved. According to the plate form control method, the blank thickness compression ratio is smaller than or equal to 20, the elongation ratio is smaller than or equal to 16.5, and the lateral spread ratio meets the formula: 1.0<=W<=1.4; the thickness of an obtained steel plate is smaller than or equal to 6 mm, and according to the steel plate performance, the yield strength is larger than or equal to 355 MPa; and the surface irregularity of the steel plate is smaller than or equal to 8 mm / 2m.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a plate shape control method in the rolling process of high-strength steel with a thickness specification below 6mm. Background technique [0002] One of the common problems in the production of thin-gauge plates in China is the control of the plate shape during the rolling process, especially for high-strength steel grades. In other words, the higher the strength, the thinner the gauge. type is more difficult to control. Considering the length of the plate and the excessive temperature drop during the rolling process, companies in the same industry usually use a steckel rolling mill when rolling a plate with a thickness of less than 10 mm. Steckel mills are characterized by poor ability to adapt to changes in thickness specifications and low output. Therefore, it is of great significance to develop a two-stand four-high rolling mill for rolling flat products with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/44B21B37/28
CPCB21B37/28B21B37/44
Inventor 秦坤李行任树洋尹绍江刘志国张振兴曹冠宇李艳杰连容广
Owner TANGSHAN HEAVY PLATE CO LTD
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