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Heat treatment method for steel plate used for extremely thick non-quenched and tempered ocean engineering

A heat treatment method and marine engineering technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve the problems of poor rolling capacity of rolling mills, small compression ratio, and no obvious improvement in the quality of continuous casting slabs, etc., to achieve wide applicability , excellent mechanical properties and stable production process

Inactive Publication Date: 2013-05-01
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, for most domestic steel mills, the quality of continuous casting slabs has not been significantly improved, the rolling capacity of the rolling mill is poor, the compression ratio is small, and many other factors limit it. It is very difficult to develop high-quality extra-thick steel for marine engineering.

Method used

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  • Heat treatment method for steel plate used for extremely thick non-quenched and tempered ocean engineering
  • Heat treatment method for steel plate used for extremely thick non-quenched and tempered ocean engineering
  • Heat treatment method for steel plate used for extremely thick non-quenched and tempered ocean engineering

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Embodiment 1-4

[0022] Implementation 1-4 is the heat treatment method of 50-100mm thick non-quenched and tempered marine engineering steel:

Embodiment 1

[0023] The heat treatment method of the 50mm thick ocean engineering E36-Z35 steel plate of embodiment 1 is specifically as follows:

[0024] The first normalizing process: the first stage is heated at 600°C, with a temperature rise coefficient of 1.6min / mm, and then kept for 20 minutes after reaching the temperature; the second stage is heated at 900°C, with a temperature rise coefficient of 1.5min / mm, and held for 20 minutes after reaching temperature; Secondary normalizing process: heating at 600°C in the first stage, with a temperature rise coefficient of 1.6min / mm, and holding for 30 minutes after reaching the temperature; heating in the second stage at 880°C, with a temperature rise coefficient of 1.5min / mm, and holding for 20 minutes after reaching the temperature; tempering The process is: the tempering temperature is 550°C, and the total tempering time is 2.5 min / mm. Obtain 50mm thick E36-Z35 steel plate for ocean engineering.

Embodiment 2

[0025] The heat treatment method of the 70mm thick ocean engineering E36-Z35 steel plate of embodiment 2 is specifically as follows:

[0026] The first normalizing process: the first stage is heated at 650°C, with a temperature rise coefficient of 1.3 min / mm, and then kept for 30 minutes after reaching temperature; the second stage is heated at 950°C, with a temperature rise coefficient of 1.2min / mm, and held for 30 minutes after reaching temperature; Secondary normalizing process: heating in the first stage at 650°C, with a temperature rise coefficient of 1.3 min / mm, and holding for 30 minutes after reaching the temperature; heating in the second stage at 930°C, with a temperature rise coefficient of 1.2min / mm, and holding for 30 minutes after reaching temperature; tempering The process is: the tempering temperature is 640°C, and the total tempering time is 2.0 min / mm. A 70mm thick E36-Z35 steel plate for marine engineering was obtained.

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Abstract

The invention provides a heat treatment method for a steel plate used for extremely thick non-quenched and tempered ocean engineering. Two times of normalizing and tempering process are adopted, in the first normalizing: in the first stage, the temperature ranges from 600 to 650 DEG C, the temperature increment coefficient is 1.3 to 1.6 min / mm, warm is kept for 20 to 30 min, in the second stage, the temperature ranges from 890 to 950 DEG C, the temperature increment coefficient is 1.2 to 1.5 min / mm, and the warm is kept for 20 to 30 min; in the second normalizing: in the first stage, the temperature ranges from 600 to 650 DEG C, the temperature increment coefficient is 1.3 to 1.6 min / mm, the warm is kept for 20 to 30 min, in the second stage, the temperature ranges 880 to 930 DEG C, the temperature increment coefficient is 1.2 to 1.3 min / mm, and the warm is kept for 20 to 30 min; and in the tempering: the temperature ranges from 550 to 640 DEG C, the total tempering time ranges from 2.0 to 2.5 min / mm. The steel plate used for extremely thick non-quenched and tempered ocean engineering has the characteristics of high strength, high plasticity, excellent Z-direction lamellar tearing resisting performance, uniform thickness directionality and the like.

Description

technical field [0001] The invention relates to a heat treatment method for steel, in particular to a heat treatment method for an extra-thick non-quenched and tempered steel plate for ocean engineering. Background technique [0002] Since 2012, steel enterprises have entered the coldest season. According to the relevant indicators of the iron and steel industry published on the website of the Development and Reform Commission in September, key enterprises lost 2.38 billion yuan in September, and the cumulative loss from January to September was 5.53 billion yuan, turning from profit to loss compared with the same period last year. In the case of serious overcapacity and no improvement in the overall market demand, the contradictions in the production structure of steel products will become more prominent, and even threaten the survival of enterprises. [0003] While the amount of steel used in other industries tends to be saturated, in recent years, the demand for steel fo...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/28C21D11/00
Inventor 车马俊崔强吴年春尹雨群邓伟刘朝霞李恒坤
Owner NANJING IRON & STEEL CO LTD
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