Method for controlling shape of low-alloy high-strength steel plate in controlled cooling phase

A low-alloy, high-strength, controlled cooling technology, applied in the field of metallurgy, can solve problems such as the unevenness of the steel plate that cannot meet the product quality requirements, fail to meet the product quality requirements, and economic losses to the enterprise, and achieve excellent plate shape, high degree of automation, Improve the effect of regular benefits

Inactive Publication Date: 2010-11-17
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high-speed cooling rate of the steel plate, the unevenness of the steel plate cannot meet the product quality requirements due to uneven cooling, and the defects of the produced products are as follows: Figure 2a-Figure 2e ,in Figure 2a is the arch in the width direction of the steel plate, Figure 2b Concave in the width direction of the steel plate, Figure 2c There are side waves in the length direction of the steel plate, Figure 2d The head of the steel plate is warped, Figure 2e Kowtow to the head of

Method used

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  • Method for controlling shape of low-alloy high-strength steel plate in controlled cooling phase
  • Method for controlling shape of low-alloy high-strength steel plate in controlled cooling phase
  • Method for controlling shape of low-alloy high-strength steel plate in controlled cooling phase

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Embodiment 1

[0021] A method for controlling the plate shape of the low-alloy high-strength steel plate in the controlled cooling stage of the present invention, the method adopts the controlled cooling process to obtain the plate shape after rolling in the controlled rolling and controlled cooling process of steel plate production, and according to the plate shape of the rolled plate Adjust the ratio of upper and lower water in the steel plate cooling process, edge shielding and the speed of the steel plate passing through the cooling zone to control the plate shape of the steel plate after cooling, and obtain a low-alloy high-strength steel plate that meets the requirements. The cooling process includes starting and cooling temperature, Final cooling temperature, cooling rate. Specific steps are as follows:

[0022] 1) The starting cooling temperature is controlled at 780-830°C, the final cooling temperature is controlled at 250-600°C, and the cooling rate is controlled at 5-25°C / s to en...

Embodiment 2

[0027] like Figure 2b , 2d After the steel plate passes through the controlled cooling system, the steel plate is concave along the width direction and the head is tilted. Since the phase change of the upper and surface of the steel plate is not uniform during the cooling process, according to the phase change volume change, that is, martensitic structure > bainite structure > Pearlite structure > ferrite structure; phase transformation temperature changes, that is, martensite structure < bainite structure < pearlite structure < ferrite structure; Surface phase change, by reducing the flow rate on the lower surface of the steel plate or increasing the flow rate on the upper surface, accelerating the phase change on the upper surface or reducing the phase change on the lower surface, a good plate shape can be obtained.

Embodiment 3

[0029] like Figure 2c After the steel plate passes through the controlled cooling system, the steel plate has side waves along the length direction. Since the upper and surface phase changes of the steel plate are not uniform during the cooling process, according to the phase change volume change, that is, martensitic structure > bainite structure > pearlite structure >Ferrite structure; phase transition temperature changes, that is, martensite structure

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Abstract

The invention discloses a method for controlling the shape of a low-alloy high-strength steel plate in a controlled cooling stage. The method is used in a controlled rolling and cooling process for producing a steel plate; the shape of the steel plate after rolling is obtained by using a controlled cooling process, and the upper to lower water ratio of the steel plate, edge masking and the speed of the steel plate passing through a controlled cooling area in the cooling process are adjusted according to the shape of the steel plate after rolling so as to control the shape of the steel plate after controlled cooling, and thus, a low-alloy high-strength steel plate capable of meeting requirements is obtained. The product produced by using the method can eliminate shape defects, such as concave upward, concave downward, edge waves, center waves and the like, of the steel plate in the process of controlled cooling, improves the accuracy of the controlled cooling process, ensures that the texture and the performance of the steel plate are more uniform, and further enhances the yield rate of the product.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a plate shape control method in the cooling stage when a medium-thick plate production line adopts a TMCP process to produce low-alloy high-strength steel plates. Background technique [0002] In recent years, the controlled rolling and controlled cooling (TMCP) process has been widely used to develop high-strength steels with different microstructures. figure 1 It is a schematic diagram of the production process of the existing medium and heavy plate using the TMCP process, in which 1 is a heating furnace, 2 is a four-roll mill, 3 is a steel plate, and 4 is a controlled cooling system. Due to the high-speed cooling rate of the steel plate, the unevenness of the steel plate cannot meet the product quality requirements due to uneven cooling, and the defects of the produced products are as follows: Figure 2a-Figure 2e ,in Figure 2a is the arch in the width direction of the...

Claims

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Application Information

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IPC IPC(8): B21B37/00B21B37/74
Inventor 唐运章
Owner NANJING IRON & STEEL CO LTD
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