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Continuous isothermal annealing method of seamless steel tube

A seamless steel pipe, isothermal annealing technology, applied in the field of warm annealing, can solve the problems of uneven cooling inside and outside, affecting process execution, temperature recovery, etc., to optimize the treatment process, increase heating uniformity, and improve the effect of heating rate

Inactive Publication Date: 2021-04-02
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method describes a high-speed steel isothermal annealing process. The isothermal annealing process described in this method adopts the method of heating the steel, keeping it warm, opening the furnace door to let the temperature drop naturally, continuing the heat preservation, and finally cutting off the heat supply. This method is very easy to cause uneven cooling of the head and tail, inside and outside of the steel pipe, and the heat of the steel pipe itself can easily cause the temperature to rise after the temperature drops, affecting the execution of the process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]The production grade is P9 and the specification is φ203 * 12.5mm, including φ203 * 12.5mm, including φ203 * 12.5mm, including heating, thermal insulation, quenching, and heat in the back fire furnace. Heating in the quenching furnace. Insulation and subsequent cooling control step; 1. The preheating section of the quenching furnace is controlled according to 900-950 ° C, and the heating section is controlled according to 950-970 ° C; the heat segments close 3 burner, leaving only 3 burner to adjust the temperature uniformity, The temperature is controlled according to 820-850 ° C; the tube temperature is not required; the quenching fire furnace is a tooth, the step time is 240 seconds; three, the quenching furnace does not open high pressure water removed, air over After the quenching device, enter the stove; four, quenching furnace into the positive φ177.8 * 9.19mm specification 1 15, fast empty passive quenching device back to the stove; five, the interval between the head ...

Embodiment 2

[0028]A seamless steel pipe is used in a seamless steel pipe for the present invention to produce a petroleum cracking tube having a production grade T9 and a specification of φ245 * 12.5mm, including the transfer, heat preservation, quenching and tempering furnace between the quenching furnace. Heating, insulation, and subsequent cooling control steps: First, the preheating section of the quenching furnace is controlled according to 900-950 ° C, the heating section is controlled by 950-970 ° C; the heat segments close 3 burner, only 3 burner regulation Temperature uniformity, temperature is controlled by 820-850 ° C; the tube temperature is not required; Second, the quenching fire furnace is a tooth, the step time is 280 seconds; three, the quenching furnace does not open high pressure water density After the immersion quaile is returned to the stove; four, quenching furnace into the positive, 1 φ244.48 * 11.99mm specification, 15 head materials, fast empty passive quenching device...

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Abstract

The invention relates to the field of seamless steel tube heat treatment, in particular to a continuous isothermal annealing method of a seamless steel tube. Large-batch continuous isothermal annealing can be conducted. According to the technical scheme for solving the technical problems, the continuous isothermal annealing method of the seamless steel tube comprises the following steps that firstly, the seamless steel tube to be treated is subjected to high-temperature heating and heat preservation through a stepping type heat treatment quenching furnace; and then the seamless steel tube is discharged from the stepping type heat treatment quenching furnace, then is continuously conveyed in air, enters a stepping type heat treatment tempering furnace through a quenching device, and finallyis subjected to isothermal heating and heat preservation in a stepping type heat treatment tempering furnace. The continuous isothermal annealing method is particularly suitable for the field of production processes for batch heat treatment of seamless steel tubes.

Description

Technical field[0001]The present invention relates to a seamless steel tube heat treatment field, in particular a continuous isothermal annealing method for seamless steel tubes.Background technique[0002]During the production of seamless steel pipes, most of the steel pipes such as petroleum cracking, P9, T9, etc., and so on, will be equivalent to obtain a suitable tissue to obtain ideal performance. At present, the contravement of the steel pipe mainly uses a traditional chamber furnace. There is only one furnace space in the room-based furnace, and all the steel pipe is stacked slowly to the set temperature range, and the temperature is quickly removed after a period of time in the set temperature range. In the other furnace, the isotherm is maintained for a period of time, and finally it is empty. This is mainly problematic in such an isothermal annealing method is that the amount of load furnace is small, the time is long, the furnace cost is high, and the production efficiency ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C21D1/26C21D1/18
CPCC21D9/08C21D1/26C21D1/18C21D9/085
Inventor 杜思敏李雄林发驹吴铖川
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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