A kind of annular heating furnace heating process optimization method
An annular heating furnace and heating process technology, applied in the field of metallurgy, can solve problems such as unsuitable high alloy steel
Active Publication Date: 2018-09-04
BAOSHAN IRON & STEEL CO LTD
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This technical solution can be applied to carbon steel and low alloy steel, but not to high alloy steel
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[0127] A ring-shaped heating furnace is divided into 8 physical sections, including furnace end section, preheating section 1, preheating section 2, heating section 1, heating section 2, heating section 3, soaking section 1, and soaking section 2. Except for the tail section, the remaining 7 sections are temperature control sections, and the length ratio of each section is 60:30:30:55:55:55:35:35.
[0128] There is an alloy billet with a diameter of 300mm. The process requires that the target temperature of the billet out of the furnace is within 1220±10°C, the soaking time is 30min, and the local maximum thermal stress of the cross-section generated during the low-temperature rapid heating process is lower than 300Mpa. The initial process is given a heating time of 210 minutes in the furnace, and the corresponding process furnace temperature of each control section is shown in Table 1:
[0129] Table 1 Initial heating process table
[0130] control segment
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Abstract
An optimizing method of a heating process of an annular heating furnace belongs to the field of metallurgy. The method comprises the following steps of: establishing an annular furnace inner pipe blank temperature model according to a heat conduction partial differential equation and a furnace internal heat radiation summary coefficient method; establishing a heat stress model according to pipe blank section heat expansion difference; establishing the adjusting flow and the adjusting rule of the heating process; calculating pipe temperature and heat stress values corresponding to different moments of the heating process by aiming at the given heating process; judging the current heating process state, combining the established adjusting flow and adjusting rule of the heating process, adjusting the heating process through iterative calculation, and finally outputting the heating process which accords with the process requirements. According to the technical scheme, the risk of surface crack caused by overhigh heat stress in the heating process of the pipe blank can be effectively reduced, the product heating quality is improved, the exhaust gas temperature of the heating furnace is reduced, and process energy consumption is reduced. The optimizing method of the heating process of the annular heating furnace can be widely applied in the fields of processing process and production control of high-alloy pipe blanks heated by the annular heating furnace.
Description
technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a heating process and a control method of an annular heating furnace used for metal heat treatment. Background technique [0002] During the heating process, before the steel enters the austenite structure, if the heating rate is too fast, the temperature inside and outside the billet will be uneven, and thermal stress will be generated. When the stress is difficult to relax and the tensile stress is large, the billet may crack. Especially high-alloy steel has low thermal conductivity, poor thermal conductivity, and relatively large thermal stress. Therefore, in the low temperature heating stage of high alloy steel, the heating rate should be taken as a small value. After the start of austenite transformation, although there will be structural stress due to phase transformation, this kind of stress can be relaxed because austenite is a soft and tough phase, and because the ...
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IPC IPC(8): C21D11/00C21D1/34C21D9/08
Inventor 邓龙吕立华王超峰潘飞许娜
Owner BAOSHAN IRON & STEEL CO LTD