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Steel plate cooling method

A cooling method and steel plate technology, applied in the field of steel plate cooling, can solve the problems of increasing the production cost of the steel plate, reducing the weldability of the steel plate, reducing the comprehensive performance of the steel plate, etc., and achieving the effect of improving the delivery capacity, uniform performance and stable production process.

Active Publication Date: 2015-04-08
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To solve the problem of insufficient strength of thick-gauge steel plates after normalizing, the method commonly used at home and abroad is to add a large amount of alloys Cr, Ni, Mn, Nb, V, Ti or increase the carbon content in the steel to increase the strength of the steel plate, but this method One is to increase the production cost of the steel plate, and the other is to reduce the weldability of the steel plate and reduce the overall performance of the steel plate
In the prior art, when the steel plate is quenched, a large amount of water is used in each area of ​​the high-pressure section, and the quenching speed of the steel plate is low, and the cooling speed of the steel plate is high. Usually, the cooling temperature of the steel plate is ≤ 100°C, so that the strength of the steel plate decreases after normalizing.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0029] The steel plate produced in the experiment of this embodiment is a 60 mm thick Q345GJC steel plate. Firstly, the steel plate is normalized, and the normalizing process of the steel plate is as follows: the normalizing temperature is 870°C, and the holding time is 20 minutes. Then the steel plate is quenched in a water-cooled mode. Through the exploration of the water-cooling mode, the water-cooling process parameters of the steel plate in the quenching section are finally determined as shown in Table 1. The total flow of water in the 15th to 18th sections is 2000m 3. The steel plate enters the quenching section to cool at a speed of 60m / min, and the speed of the roller table of the quenching machine is 40m / min. After the steel plate is water-cooled, the reddening temperature of the steel plate is between 630 and 670°C. After inspection, the yield strength and tensile strength of the steel plate are 40-60MPa higher than the strength value of conventional normalizing ...

Embodiment 2

[0034] The steel plate in this embodiment is a 100 mm thick Q345C steel plate with a strength slightly lower than the standard after normalizing. The normalizing process of the steel plate is as follows: the normalizing temperature is 860°C, and the holding time is 30 minutes. The water-cooling process was further explored, and the parameters of the steel plate water-cooling process in the quenching section were finally determined as shown in Table 2. The total flow of water in the 15th to 18th sections is 1200m 3 . The steel plate enters the quenching section to cool at a speed of 40m / min, and the speed of the roller table of the quenching machine is 30m / min. After the steel plate is water-cooled, the reddening temperature of the steel plate is between 640 and 680°C. After inspection, the yield strength and tensile strength of the steel plate are 30-50MPa higher than those of conventional normalizing treatment, and the strength of the steel plate meets the standard require...

Embodiment 3

[0039] The steel plate in this embodiment is a 100 mm thick Q345C steel plate with a strength slightly lower than the standard after normalizing. The normalizing process of the steel plate is as follows: the normalizing temperature is 910°C, and the holding time is 50min. The water-cooling process was further explored, and the parameters of the steel plate water-cooling process in the quenching section were finally determined as shown in Table 3. The total flow of water in the 15th to 18th sections is 3600m 3 . The steel plate enters the quenching section to cool at a speed of 50m / min, and the speed of the roller table of the quenching machine is 35m / min. After the steel plate is water-cooled, the reddening temperature of the steel plate is between 640 and 680°C. After inspection, the yield strength and tensile strength of the steel plate are 30-50MPa higher than those of conventional normalizing treatment, and the strength of the steel plate meets the standard requirements...

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Abstract

The invention discloses a steel plate cooling method. After a steel plate is normalized, cooling in a quenching stage is carried out at a speed of 40-60m / min, and speed of a roller cooled by the quenching stage is 30-40m / min. The steel plate cooling method has the advantages that the steel plate is quickly cooled after being normalized, phase-transition temperature can be reduced while cooling speed of the steel plate is increased, nucleation rate of ferrite is increased, ferrite grains are refined, a phase transformation structure is thinned, carbide growth of microalloy elements can also be inhibited, and the microalloy elements are dispersed and separated out at low temperature, and thus strength of a steel plate is improved, and toughness of the steel plate is not reduced.

Description

technical field [0001] The invention relates to the technical field of normalizing and controlling cooling of medium and thick plates, in particular to a steel plate cooling method. Background technique [0002] 60-120mm thick low-alloy high-strength steel is usually normalized by controlled rolling or heat treatment. After the traditional normalizing process, the strength of the steel plate is generally 30-50Mpa lower than the strength after controlled rolling, often lower than the lower limit of the standard value or in the standard Value lower bound edge. To solve the problem of insufficient strength of thick-gauge steel plates after normalizing, the method commonly used at home and abroad is to add a large amount of alloys Cr, Ni, Mn, Nb, V, Ti or increase the carbon content in the steel to increase the strength of the steel plate, but this method One is to increase the production cost of the steel plate, and the other is to reduce the weldability of the steel plate and...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D9/46
CPCC21D1/19C21D1/28C21D9/52C21D2211/005
Inventor 白永强李浩
Owner INNER MONGOLIA BAOTOU STEEL UNION
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