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One-fire hot charging heat treatment process of ferrite stainless steel hot-rolled hot-rolled plate

A stainless steel and ferrite technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control and other directions, can solve the problems of uneven corrosion resistance, difficult heat treatment operation, uneven coil performance, etc., to save processing time, High strength and uniform corrosion resistance

Active Publication Date: 2022-03-22
辽宁石源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem solved by the present invention is how to overcome the adverse effects on the structure and performance of the material that the ferritic stainless steel hot-rolled and hot-rolled coils in the prior art cannot be prepared by one-fire hot-charging heat treatment process, for example: the existing hot-rolled and annealed Generally, they are separated, among which: the annealing adopts cold coil heating, which leads to energy consumption, and the most important thing is that the coil performance after heat treatment is not uniform; while the continuous furnace is limited by the length of the heating section, the temperature difference of the material after heat treatment in the bell annealing furnace Large and uneven mechanical properties, metallographic structure, and corrosion resistance, the heat treatment operation is difficult and the time is too long

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0043] One-fire hot-charging heat treatment process for ferritic stainless steel hot-rolled hot coil plate for cold rolling

[0044] The composition of ferritic stainless steel is shown in the table below:

[0045] element C Cr Ni mn Si P S N / ppm Mass content% 0.02 16.3 0.4 0.6 0.5 0.02 0.01 180

[0046] Such as figure 1 As shown, the specific heat treatment process steps are as follows:

[0047] S1. At the end of hot rolling, the temperature of ferritic stainless steel after hot coiling is controlled above 850°C;

[0048] S2, preheating the mobile bell annealing furnace to 850°C;

[0049] S3, install the furnace, and after the temperature is stabilized at 830±5°C, keep it warm for 4 hours;

[0050] S4. Stop heating until the temperature drops below 600°C;

[0051] S5, taking out the furnace and cooling to room temperature to obtain a ferritic stainless steel coil for cold rolling. After testing, the performance of the coil is unif...

Embodiment 2

[0054] One-fire hot-charging heat treatment process for ferritic stainless steel hot-rolled hot coil plate for cold rolling

[0055] The composition of ferritic stainless steel is shown in the table below:

[0056] element C Cr Ni mn Si P S N / ppm Mass content% 0.02 16.3 0.4 0.6 0.5 0.02 0.01 180

[0057] The specific heat treatment process steps are as follows:

[0058] S1. At the end of hot rolling, the temperature of ferritic stainless steel hot-rolled coils before entering the furnace is controlled at 880°C;

[0059] S2, preheating the mobile bell annealing furnace to 870°C;

[0060] S3, install the furnace, and after the temperature is stabilized at 850±5°C, keep it warm for 2.5 hours;

[0061] S4. Stop heating until the temperature drops below 600°C;

[0062] S5, taking out the furnace and cooling to room temperature to obtain a ferritic stainless steel coil for cold rolling. After testing, the performance of the coil is uniform...

Embodiment 3

[0065] One-fire hot-charging heat treatment process for hot-rolled hot-coiled ferritic stainless steel plate for structural use

[0066] Among them: the composition of ferritic stainless steel is shown in the following table:

[0067] element C Cr Ni mn Si P S N / ppm Mass content% 0.07 17.3 1.4 0.7 0.6 0.025 0.002 180

[0068] Such as figure 2 As shown, the specific heat treatment process steps are as follows:

[0069] S1. At the end of hot rolling, the temperature of ferritic stainless steel hot-rolled coils before entering the furnace is controlled at 750°C;

[0070] S2, preheating the mobile bell annealing furnace to 750°C;

[0071] S3, install the furnace, and after the temperature is stabilized at 730±5°C, keep it warm for 1 hour;

[0072] S4. Stop heating until the temperature drops below 600°C;

[0073] S5, taking out of the furnace and cooling to room temperature to obtain a ferritic stainless steel coil for structure. After ...

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Abstract

The invention discloses a one-fire hot charging heat treatment process for a ferrite stainless steel hot-rolled hot-rolled plate, and belongs to the technical field of stainless steel production. According to the heat treatment process, after hot rolling, a hot coiled plate is directly loaded into a preheated movable cover type annealing furnace or tempering furnace to be subjected to heat treatment, so that the technical defect that hot rolling and annealing are separated in the prior art is overcome, and the coiled plate subjected to cold coil heating heat treatment is non-uniform in performance; and the structural ferritic stainless steel with the yield strength of 400-500 MPa, which cannot be realized by a traditional annealing method, is produced, and a large amount of heat energy is saved. Through a simple and convenient one-fire hot charging heat treatment continuous process, the ferrite stainless steel coiled plate can respectively meet the performance requirements of cold rolling and structural steel by controlling two heat treatment temperatures and time. The process method is suitable for large-scale production, less in furnace occupation time, low in energy consumption and beneficial to rapid switching of heat treatment temperature and time of steel coils with different components, product quality is improved, and an efficient rolling process is matched.

Description

technical field [0001] The invention belongs to the technical field of stainless steel production, and relates to a one-fire hot-charging heat treatment process for ferritic stainless steel hot-rolled coils. Background technique [0002] Ferritic stainless steel, as the main type of stainless steel, has received more and more attention and use in my country, and its scope of application has gradually expanded. At present, ferritic stainless steel must be annealed before cold rolling to improve the elongation of ferritic stainless steel, adjust the grain size, and meet the requirements of subsequent cold rolling. The main method of annealing ferritic stainless steel after hot rolling is bell furnace or continuous furnace. [0003] However, the existing annealing methods cannot carry out continuous annealing, and there are technical defects in the influence of continuous annealing on the performance of ferritic stainless steel. Specifically, due to the limitation of the leng...

Claims

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Application Information

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IPC IPC(8): C21D1/30C21D6/00C21D9/675C21D11/00C22C38/02C22C38/04C22C38/40
CPCC21D1/30C21D11/00C21D6/004C21D6/005C21D6/008C22C38/04C22C38/02C22C38/40C21D9/675Y02P10/20
Inventor 王平赵庆升赵永璞
Owner 辽宁石源科技有限公司
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