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A control method for the roller quenching process of large single weight and large section extra thick steel plate

A technology of extra-thick steel plate and control method, applied in the field of metallurgy, can solve problems such as no control method, no mention of heat transfer coefficient correction, etc., and achieve the effect of reducing energy consumption and production cost

Active Publication Date: 2018-12-28
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

The patent CN102507636A discloses a method for measuring the interface heat transfer coefficient in the rapid cooling process of steel. By connecting the thermocouple spot welding to the temperature acquisition module, the surface temperature change data is obtained, and the interface heat transfer coefficient in the cooling process is obtained by using heat treatment software. , and then simulate the temperature change of the workpiece cooling process, and compare with the measured results until the change trend is in good agreement; none of the prior art involves the control method related to the roller quenching process of large single weight and large cross-section extra-thick steel plates , not to mention the specific method of correcting the heat transfer coefficient in the roll quenching process of large single weight and large cross-section extra-thick steel plates by using the corrected model

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  • A control method for the roller quenching process of large single weight and large section extra thick steel plate
  • A control method for the roller quenching process of large single weight and large section extra thick steel plate
  • A control method for the roller quenching process of large single weight and large section extra thick steel plate

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Embodiment

[0061] Steel plate thickness 132mm, length 7250mm, carbon content 0.15%, roller speed 0.2m / s, acceleration 0.00015m / s 2 , the length of the high-pressure section of the quenching machine is 3.2m, and the initial value of the heat transfer coefficient: the air-cooling section is 100W / (m 2 K), high pressure section 20000W / (m 2 K), low pressure section 8000W / (m 2 K), the water temperature is 22.1°C, the furnace temperature is 910°C, the temperature before entering the quenching machine is 830°C, the air cooling time is 45s, the low pressure swing time is 1560s, the redness time is 142s, and the redness temperature is 28°C. Take the cell length as 1mm, and the time step as 0.5s, the calculation process is as attached figure 1 shown.

[0062] Calculation result: The heat transfer coefficient value of the air-cooling section is 124.64W / (m 2 K), the water cooling heat transfer coefficient of the low pressure section is 2250W / (m 2 K). The temperature drop curve is attached fig...

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Abstract

A control method for a roller quenching process of a heavy-piece weight and large-section ultra-heavy plate has a specific heat model, heat transfer coefficient model, temperature field model and correction model. Plate parameters inputted include thickness, length and carbon content, technological procedure, roller speed and acceleration. Measured parameters include tapping temperature, temperature after air cooling and temperature after self-tempering. The temperature field model is used. Specific heat model and the heat transfer coefficient model are invoked for calculating an air cooling stage, water cooling stage and self-tempering stage in sequence. Temperature fields are corrected through the correction model. Simulated results include a group of cooling curves and cooling speed curves at different thicknesses. Practical temperature drop curves and cooling speed curves are obtained in combination with actual production and part of actual debugging process is replaced by model calculation.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a method for controlling a steel plate roller quenching process. Background technique [0002] The temperature field distribution of the extra-thick steel plate after quenching will affect the physical properties and machining performance of the steel plate to a large extent. In the traditional immersion quenching, the steel plate is immersed in the quenching pool or quenching tank, limited by the volume of the container, the cooling rate is slow and the distribution is uneven. Roller quenching, the steel plate enters the quenching machine through the rotating roller table, and the high-pressure jet is sprayed on the surface of the steel plate. Compared with the traditional quenching method, the cooling speed is greatly increased, and the steel plate can be cooled to room temperature in a short time. However, due to the large thickness of the steel plate and the slow heat transf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/18C21D1/60C21D9/00C21D11/00
CPCC21D1/18C21D1/60C21D9/0081C21D11/00C21D1/62C21D9/46C21D11/005
Inventor 付天亮王昭东田秀华邓想涛李勇李家栋韩冰韩钧
Owner NORTHEASTERN UNIV LIAONING
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