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Heat treatment process for improving mechanical property of steel plate in tempering mode

A steel plate and process technology, which is applied in the field of heat treatment technology for improving the comprehensive mechanical properties of microalloyed steel plates by tempering, and can solve the problems of low impact value of hot-rolled thick steel plates.

Inactive Publication Date: 2012-02-01
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the impact value of hot-rolled thick steel plate is low

Method used

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  • Heat treatment process for improving mechanical property of steel plate in tempering mode
  • Heat treatment process for improving mechanical property of steel plate in tempering mode
  • Heat treatment process for improving mechanical property of steel plate in tempering mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] In this embodiment, pearlitic-ferritic steel Q345E is produced, and the thickness of the steel plate is 18mm, 20mm, 30mm, 32mm. The performance of controlled rolling is as follows (the numbers in the table are followed by * for unqualified indicators):

[0014]

[0015] After tempering at 550°C, T=4min / mm, and water-cooling process, the properties are as follows:

[0016]

Embodiment 2

[0018] In this embodiment, low-carbon pearlite + ferritic steel (containing a small amount of bainite) Q460C is produced, and the thickness of the steel plate is 20mm and 25mm. The performance of controlled rolling is as follows (the numbers in the table are followed by * for unqualified indicators):

[0019]

[0020] After tempering at 550℃, T=4.5min / mm, and air-cooled, the properties are as follows:

[0021]

Embodiment 3

[0023] In this embodiment, low-carbon bainite steel Q550D is produced, and the thickness of the steel plate is 25mm and 30mm. The performance of TMCP-RPC rolled Q550D is as follows (the numbers in the table are followed by * for substandard indicators):

[0024]

[0025] After 680℃, T=4min / mm, water cooling and tempering, the properties are as follows:

[0026]

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Abstract

The invention discloses a heat treatment process for improving the mechanical property of a steel plate in a tempering mode. In the heat treatment process, after a micro alloy steel plate is rolled, tamping heat treatment modes of carrying out the tampering heat treatment in a temperature range of 300 DEG C to Ac1, shorting the high temperature residence time of the steel plate by controlling and regulating a tamping temperature in a mode of firstly carrying out water cooling and then carrying out wind cooling or firstly carrying out water cooling and then carrying out air cooling, quickening the cooling speed of the steel plate in a water cooling and wind cooling mode and the like are adopted. The heat treatment process is provided for improving the plastic toughness of the steel plate and producing an acicular ferrite and the low (super low) bainite high strength steel plate. The tempering has important significance for the performance of the low (micro) alloy steel plate and the improvement of the product grade, has wide application prospect and takes the effect of ensuring the mechanical property index for producing low (micro) alloy steel plates in batches by adopting different tampering temperatures and different heat preservation times to control the improvement and the reduction of the yield strength and the plastic toughness of the steel grade for the steel plates with different substrates.

Description

technical field [0001] The invention belongs to the technical field of steel plate manufacturing, in particular to a heat treatment process for tempering to improve the comprehensive mechanical properties of microalloyed steel plates. Background technique [0002] Micro-alloy steel plates are mainly used in many fields such as low-alloy high-strength steel and pipeline steel. The structure obtained during controlled rolling and controlled cooling of steel plates is usually not uniform, which affects the use of materials, especially thick gauge steel plates. [0003] For the traditional low (micro) alloy steel - ferrite + pearlitic steel, the cumulative reduction rate in the rolling process without recrystallization is relatively large, and the cooling and deformation speed of the second-stage hot rolling is very fast , Controlled rolling in the non-recrystallized area will accumulate a large number of dislocations, forming work hardening, and the dislocation density in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/00C21D11/00
Inventor 朱书成唐郑磊许少普崔冠军杨东张涛李红阳袁恒朱成杰徐昭庞林李忠波
Owner NANYANG HANYE SPECIAL STEEL CO LTD