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Three-section type atmosphere controlled heat treatment furnace

A heat treatment furnace, three-stage technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of limited use, uncontrollable atmosphere, impossible intermittent steel strips, etc., to achieve convenient use, low cost, and guaranteed The effect of using safety

Inactive Publication Date: 2007-02-07
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are (1) the annealing atmosphere has two stages, and it is impossible to reach three or more stages; (2) after the isolation device is set up, the equipment is only suitable for the production of continuous steel strips, and it is impossible to use it for the experiment of intermittent steel strips
The disadvantage of this invention is that the furnace section is one section, and the atmosphere cannot be controlled
[0006] In summary, the above-mentioned existing various heat treatment furnaces generally have the problems of complex structure, uncontrollable atmosphere and limited use

Method used

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  • Three-section type atmosphere controlled heat treatment furnace

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Effect test

Embodiment 1

[0031] After a certain high magnetic induction oriented silicon steel is smelted, billet cast, hot rolled, and cold rolled, the hot-rolled plate is subjected to the following heat treatment in the three-stage controllable atmosphere heat treatment furnace of the present invention: the sample is debonded in the first stage. Carbon annealing at 840°C×3min, annealing atmosphere 5LH2 / min+4LN2 / min, dew point 65°C; followed by reduction treatment in stage II at 920°C×1min, atmosphere 5LH2 / min+4LN2 / min. After the sample was released from the furnace, it was coated with magnesium oxide coating and subjected to secondary recrystallization high-temperature annealing. The magnetic properties of the sample were tested as B8: 1.93T; P17: 1.12W / kg, which met the performance requirements of HiB steel.

Embodiment 2

[0033]A certain oriented silicon steel hot-rolled plate, after cold rolling, is subjected to the following heat treatment in the three-stage controllable atmosphere heat treatment furnace of the present invention: the sample is heated in the third stage without oxidation, and the atmosphere is 1LH2 / min+5LN2 / min+ 2LAr / min, followed by decarburization annealing in the second stage at 840℃×3min, annealing atmosphere 2LH2 / min+4LN2 / min, dew point 55℃; then nitriding treatment in the first stage 750℃×30s, atmosphere 5LH2 / min +5LN2 / min+0.2LNH3 / min, PH2O / PH2=0.05. After the sample was released from the furnace, it was coated with magnesium oxide coating and subjected to high-temperature annealing for secondary recrystallization. The magnetic properties of the sample were tested as B8: 1.90T; P17: 1.137W / kg, which met the performance requirements of HiB steel.

Embodiment 3

[0035] A certain high-grade non-oriented silicon steel hot-rolled plate is subjected to the following heat treatment in the three-stage controllable atmosphere heat treatment furnace of the present invention after cold rolling: the sample is heated in the third stage without oxidation, and the atmosphere is 3LH2 / min+1LN2 / min, followed by annealing in the second stage at 850°C×3min, annealing atmosphere 2LH2 / min+4LN2 / min, dew point 35°C, then annealing in stage I at 950°C×1min, annealing atmosphere 2LH2 / min+4LN2 / min , The magnetic properties of the sample were tested as B50: 1.74T; P15: 2.58W / kg.

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Abstract

the invention discloses a three-segmented controllable heat disposing furnace, which comprises the following parts: furnace system, heating system and sample driving system, wherein the furnace system contains sample disposal channel, flux channel and furnace bulk; the sample disposing channel parallels the furnace; the sample driving system is placed in the sample disposal channel, which is packed on two ends by sealing door; the inlet (2) is set in the outlet of sample disposal channel, which contains inlet (4) at inlet part; the inlet (3) is opened at the position near the inlet (4) on the sample disposal channel; the inlet (2) of flux is set on the sample disposal channel between inlet (2) and inlet (3).

Description

technical field [0001] The invention relates to a heat treatment furnace used in the production and experiment of steel strips, in particular to a three-stage controllable atmosphere heat treatment furnace. Background technique [0002] The production and experiment of the steel strip require various atmosphere control in the heat treatment process to achieve the required performance requirements. Therefore, various heat treatment furnaces suitable for different atmospheres have been disclosed before the present invention is proposed. [0003] Patent ZL 92113560.2 discloses a continuous annealing furnace, the annealing furnace is composed of a non-oxidizing preheating furnace, a radiant tube heating furnace, an electric soaking furnace and a cooling section, and is divided into a front section by an isolation device, and a wet protective atmosphere is introduced to realize decarburization Annealing; the latter section is passed into a dry protective atmosphere to realize the...

Claims

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Application Information

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IPC IPC(8): C21D9/56
Inventor 王若平王向欣杨润生胡守天崔勇进姚成君杜光梁
Owner WUHAN IRON & STEEL (GROUP) CORP
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