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Heat treatment technology for low-temperature high impact toughness medium-thickness steel plate

A high-impact, high-toughness technology, applied in the field of metallurgy, can solve the problems of high maintenance cost of heat treatment equipment, high heat treatment energy consumption, low production efficiency, etc., and achieve the effect of shortening production cycle, high internal and external quality, and low production cost.

Inactive Publication Date: 2010-11-24
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the deficiencies in the conventional normalizing process for TMCP steel plates with a thickness of 4 mm to 10 mm in the prior art, the purpose of the present invention is to provide a heat treatment process for low-temperature high-impact toughness medium-thickness steel plates, which can effectively solve the problem of TMCP steel plate has problems such as plate shape warpage caused by high heating temperature, high energy consumption of heat treatment, high maintenance cost of heat treatment equipment, low production efficiency and other problems during heat treatment of TMCP steel plate, and steel plate with high low temperature impact toughness (below -40°C) can be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A heat treatment process for a medium-thickness steel plate with low temperature and high impact toughness according to the present invention, using 8mm S355NL TMCP steel plate. The steel plate enters the roller hearth heat treatment furnace for heating. When the steel plate is heated to 650°C±5°C, it is kept for 40 minutes and then it is air-cooled out of the furnace.

[0028] The results of steel plate flatness test and steel plate sampling performance test are as follows:

[0029] 1. The maximum unevenness of the steel plate is less than 1.6mm / 2m;

[0030] 2. Mechanical properties: ReL: 447MPa, Rm: 547MPa, A: 32.4%, impact energy (J) at -60°C (sample size: 7.5×10×55): 171 / 185 / 162.

[0031] The above mechanical properties all meet the requirements of the corresponding standards.

Embodiment 2

[0033] Yet another heat treatment process of the low-temperature high-impact toughness medium-thickness steel plate according to the present invention uses 8mm S355NL TMCP steel plate. The steel plate enters the roller hearth heat treatment furnace for heating. When the steel plate is heated to 630°C±5°C, it is kept for 40 minutes and then it is air-cooled out of the furnace.

[0034] The results of steel plate flatness test and steel plate sampling performance test are as follows:

[0035] 1. The maximum unevenness of the steel plate is less than 1.5mm / 2m;

[0036] 2. Mechanical properties: ReL: 365MPa, Rm: 540MPa, A: 31%, impact energy (J) at -50°C (sample size: 7.5×10×55): 180 / 186 / 177.

[0037] The above mechanical properties all meet the requirements of the corresponding standards.

Embodiment 3

[0039] Another heat treatment process for low-temperature high-impact toughness medium-thickness steel plate uses 10mm Q690TMCP steel plate. The steel plate enters the roller hearth heat treatment furnace for heating. When the steel plate is heated to 610°C±5°C, it is kept for 40 minutes and then it is air-cooled out of the furnace.

[0040] The results of steel plate flatness test and steel plate sampling performance test are as follows:

[0041] 1. The maximum unevenness of the steel plate is less than 1.3mm / 2m;

[0042] 2. Mechanical properties: Rel: 718MPa, Rm: 778MPa, A: 18.8%, impact energy (J) at -40°C (sample size: 10×10×55): 67 / 87 / 80.

[0043] It can be seen from the examples that the present invention is used for steel plate heat treatment, and has the advantages of short production process, low energy consumption, and low production cost, and the obtained steel plate has high internal and external quality, especially high low-temperature impact toughness (below -40...

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Abstract

The invention discloses heat treatment technology for a low-temperature high impact toughness medium-thickness steel plate. The heat treatment technology comprises the following steps of: putting the steel plate into a furnace and heating, wherein the heating temperature is 50 to 100 DEG C lower than the Al temperature; keeping the temperature for 40 to 80 minutes; and discharging and performing air cooling to obtain the low-temperature high-toughness medium-thickness steel plate. The heat treatment technology can effectively solve the problems of plate warp, high heat treatment energy consumption, high maintenance cost of heat treatment equipment, low production efficiency and the like due to high heating temperature when normalizing heat treatment is performed on a TMCP steel plate, and also can obtain the low-temperature high-toughness steel plate at the temperature of 40 DEG C below zero.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a steel plate heat treatment process, in particular to a heat treatment process for a medium-thick steel plate with high impact toughness. Background technique [0002] With the rapid development of the national economy, the demand for steel plates in manufacturing industries such as bridges, boilers, pressure vessels, ship moorings, and wind towers is increasing, and the performance of steel plates, especially low-temperature impact toughness, is increasingly demanding. According to the production method of hot rolling, controlled rolling and controlled cooling process (TMCP), it is usually only possible to produce structural steel plates that can meet the impact toughness requirements from room temperature to 0 ° C; However, when the thickness of the steel plate is required, or when the impact toughness is required to be higher at lower temperatures, TMCP shows limitations, such as poor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C22C38/14
Inventor 楚觉非颜银标王端军何烈云杨建平刘丽华
Owner NANJING IRON & STEEL CO LTD
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