Hot processing process for normalizing thin steel plate with thickness no more than 12 mm

A technology of thin steel plate and heat treatment furnace, applied in heat treatment furnace, heat treatment equipment, manufacturing tools, etc., to achieve the effect of uniform microstructure, low production cost, and elimination of structural stress

Inactive Publication Date: 2010-01-27
新余钢铁股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to propose a new thin-gauge steel heat treatment process for the deficiencies in the existing thin-gauge heat-treated steel plate production process, which can effectively solve the plate shape problem in the thin-gauge steel plate heat treatment, reduce heat treatment energy consumption, Improve production efficiency and at the same time properly improve the mechanical properties of the steel plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: 6mm Q345R pressure vessel plate is normalized. The steel plate enters the heating process in the furnace from the tail end of the heat treatment furnace for heating. When the steel plate is heated to Ac 1 ~ Ac 3 In the temperature range, especially at 840°C, it enters the furnace heat preservation process for heat preservation. The heat preservation temperature is 840°C, and the heat preservation time is 1H min, that is, 6 minutes, and then enters the furnace cooling process set in the furnace for furnace cooling. There is no heat provided except the radiant heat in the heat preservation process. The steel plate is released from the furnace when the temperature drops to 420°C in the furnace cooling process. After the furnace is released, the cooling bed is air-cooled to room temperature.

[0011] The performance of the steel plate after the flatness test and sampling analysis is as follows:

[0012] Maximum unevenness of steel plate: 3mm / 2m;

[0013] Mecha...

Embodiment 2

[0016] Example 2: 10mm Q370R pressure vessel plate is normalized. The steel plate enters the heating process in the furnace from the tail end of the heat treatment furnace for heating. When the steel plate is heated to Ac 1 ~ Ac 3 In the temperature range, especially at 860°C, it enters the furnace heat preservation process for heat preservation. The heat preservation temperature is 860°C, and the heat preservation time is 2H min, that is, 20min. No heat is provided except the radiant heat in the heat preservation process. The steel plate is released from the furnace when the temperature drops to 600°C in the furnace cooling process. After the furnace is released, the cooling bed is air-cooled to room temperature.

[0017] The performance of the steel plate after the flatness test and sampling analysis is as follows:

[0018] Maximum unevenness of steel plate: 4mm / 2m;

[0019] Mechanical properties: ReL: 400MPa Rm: 580MPa A: 22.5%

[0020] -20°C Akv (horizontal, J): 95 / 86 / ...

Embodiment 3

[0022] Example 3: Normalizing treatment of 6mm 16MnDR low temperature pressure vessel plate. The steel plate enters the heating process in the furnace from the tail end of the heat treatment furnace for heating. When the steel plate is heated to Ac 1 ~ Ac 3 In the temperature range, especially at 830°C, it enters the heat preservation process in the furnace for heat preservation. The heat preservation temperature is 830°C, and the heat preservation time is 3H min, that is, 18min. Then it enters the furnace cooling process set in the furnace. There is no heat provided except for the radiant heat in the heat preservation process. The steel plate is released from the furnace when the temperature drops to 350°C in the furnace cooling process.

[0023] The performance of the steel plate after the flatness test and sampling analysis is as follows:

[0024] Maximum unevenness of steel plate: 5mm / 2m;

[0025] Mechanical properties: ReL: 345MPa Rm: 520MPa A: 24.5%

[0026] -40°C Ak...

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Abstract

The invention provides a thermal treatment technique of a thin format steel plate and is characterized in that a furnace cooling process is added between the heat preserving process and the air cooling process;parameter requirements of each process comprise: 1. a steel plate in a heat treatment furnace is heated to a temperature of Ac1-Ac3 in the heating process; 2. the holding temperature of the steel plate in the heat treatment furnace is Ac1-Ac3 and the heat-preserving time is 1H-3H in the heat preserving process; 3. the temperature of the steel plate at the furnace port is 350 DEG C - 650 DEG C in the furnace cooling process; 4. the steel plate took out from the furnace is cooled in the air to the room temperature.Comparing with a general technique of normalization and cold leveling, the technique of the invention has characteristics of low equipment investment, low energy-consumption, short line of production, low producing cost and better inside and outside quality of the steel plates.

Description

Technical field: [0001] The invention relates to a heat treatment process for plates in the metallurgical industry, in particular to a heat treatment process for thin steel plates with a thickness not greater than 12mm that require normalizing. Background technique: [0002] With the progress of society, all walks of life have an increasing demand for heat-treated steel products, especially for thin-gauge (thickness ≤ 12mm) heat-treated steel plates. Steel heat treatment processes usually include normalizing, tempering, annealing, normalizing + tempering, quenching + tempering, etc. Thin-gauge heat-treated steel plates are generally produced by conventional normalizing + cold leveling machine straightening. The conventional normalizing process is generally: the steel plate is heated to its Ac in the heat treatment furnace 3 After the above temperature, keep warm for a certain period of time, and then take it out of the oven and air cool to room temperature. Due to the tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/46
Inventor 刘小林夏文勇龚红根王鹏张留洪钟小杰赵和明彭冲赖朝彬
Owner 新余钢铁股份有限公司
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