CN104017964A - Silicon steel heat treatment method - Google Patents
Silicon steel heat treatment method Download PDFInfo
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- CN104017964A CN104017964A CN201410260614.3A CN201410260614A CN104017964A CN 104017964 A CN104017964 A CN 104017964A CN 201410260614 A CN201410260614 A CN 201410260614A CN 104017964 A CN104017964 A CN 104017964A
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Abstract
The invention relates to a silicon steel heat treatment method. A silicon steel annealing furnace is composed of an inlet sealing chamber, a preheating furnace, a non-oxidation furnace, a first furnace throat, a radiant tube heating furnace, a soaking furnace, a second furnace throat, a circulating gas spray cooler and an outlet sealing chamber. The silicon steel heat treatment method comprises the following steps: 1) heating the preheating furnace, non-oxidation furnace and radiant tube heating furnace in a coke oven gas heating mode, and controlling the furnaces to achieve the required temperatures; 2) heating the soaking furnace in a resistance heating mode, and controlling the furnace to achieve the required temperature; 3) charging argon-hydrogen mixed protective gas into the annealing furnace to perform furnace cleaning; and 4) sequentially passing a silicon strip through the inlet sealing chamber, preheating furnace, non-oxidation furnace, first furnace throat, radiant tube heating furnace, soaking furnace, second furnace throat and outlet sealing chamber at a certain operating speed, wherein the circulating gas spray cooler continuously sprays the argon-hydrogen mixed protective gas in the process. The heat treatment process can not easily form the oxide film protection layer, is beneficial to decarbonization, and enhances the performance indexes of the silicon steel.
Description
Technical field
The present invention relates to smithcraft field, particularly a kind of silicon steel heat treating method.
Background technology
Silicon steel is mainly the ferro-silicon of iron, is the indispensable non-retentive alloy of electric power, electronics and war industry, is mainly used in the iron core of various motors, generator and transformer.Silicon steel performance requriements iron loss is low, magnetic induction density is high, smooth surface is smooth, punching is good, tack and the weldability of surface insulating film are good.
Silicon Heat Treatment Of Steel is the important step of production superior performance silicon steel.In silicon steel, the content of silicon is between 0.5% to 1.7%, and this adds when steel-making, and the effect of annealing furnace is physical reaction, does not affect silicone content, but the silicon crystal grain in silicon steel is increased, and the iron loss that reaches silicon steel is low, i.e. the high special efficacy of magnetic permeability.Remove the carbon in silicon steel simultaneously, generate the steel containing HIGH-PURITY SILICON, i.e. silicon steel.In silicon steel, carbon content requires to be less than 27ppm, the high quality that affects silicon steel of carbon content.
In annealing furnace, the selection of protective atmosphere, should prevent surface oxidation, is conducive to again the maximum decarburization of silicon strip.Iron And Steel Industry, in annealing process of silicon steel, often adopts the nitrogen and hydrogen mixture of the saturation moisture content with certain temperature as the shielding gas in silicon steel annealing furnace.Nitrogen can form tiny AIN (aluminium nitride) particle, the grain growth while suppressing silicon steel finished products in steel.Nitride is needle-like and how stupefied clevis thing more, easily forms pointed magnetic domain, produces a large amount of additional magnetic domains, has a strong impact on the rotation of magnetic domain, and magnetic property is worsened.Nitrogen and oxygen freezing point are nearer, and separation accuracy requires high, contains a certain amount of oxygen in nitrogen and hydrogen mixture.Oxygen forms various oxide compounds in silicon steel, affects the continuity of matrix, especially in silicon steel, easily forms a large amount of silicon-dioxide, titanium dioxide two aluminium and compound folder thing, causes the generation of complicated magnetic domain, and magnetic property is worsened.Oxygen accelerates the velocity of diffusion of nitrogen in steel, indirectly accelerates the generation of magnetic aging.The fine oxides such as manganese oxide hinder grain growth, and magnetic degenerates.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, and a kind of silicon steel heat treatment technology is provided, and improves the performance index of silicon steel.
For achieving the above object, the present invention realizes by the following technical solutions:
A silicon steel heat treating method, silicon steel annealing furnace is comprised of inlet seal chamber, preheating oven, non-oxidation furnace, No. 1 furnace throat, radiator tube process furnace, soaking pit, No. 2 furnace throats, recycle gas shower cooler, exit seal chambers; Silicon steel heat treatment step is as follows:
1) adopt coke-oven gas type of heating heating preheating oven, non-oxidation furnace, radiator tube process furnace, control each stove furnace temperature and reach requirement temperature;
2) adopt resistive heating mode to heat soaking pit and control furnace temperature and reach requirement temperature;
3) in annealing furnace, be full of argon hydrogen hybrid protection gas and sweep stove;
4) silicon strip is with certain travelling speed successively by inlet seal chamber, preheating oven, non-oxidation furnace, No. 1 furnace throat, radiator tube process furnace, soaking pit, No. 2 furnace throats, exit seal chamber, and in this process, recycle gas shower cooler constantly sprays argon hydrogen hybrid protection gas.
It is 1000 ℃～1100 ℃ that described preheating oven is controlled temperature, and it is 1100 ℃～1200 ℃ that non-oxidation furnace is controlled temperature, and radiator tube Heating Furnace Control temperature is 900 ℃～950 ℃, and it is 800 ℃～900 ℃ that soaking pit is controlled temperature.
In described argon hydrogen hybrid protection gas, volume percent is 80 ﹪ Ar and 20 ﹪ H2.
Described silicon strip travelling speed reaches 160～180m/min.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention adopts freezing point and oxygen gap is large, resolution is high, inertia is large argon gas as protective atmosphere, and oxygen level can reach 1PPm, is difficult for forming oxide protective layer, is conducive to decarburization.Avoided because of the high silicon steel sheet blackening phenomena occurring of oxygen content, silicon strip surface brightness is high.Because rare gas element does not participate in reaction in furnace, make furnace inner environment stable, the silicon crystal grain being more conducive in silicon steel increases.Reduce decarburization time, improve the speed of silicon strip, and reduce because of the long phenomenon that reduces silicon steel quality of decarburization time, improved quality product and output.
Embodiment
Below the specific embodiment of the present invention is further illustrated:
Embodiment 1
A silicon steel heat treating method, silicon steel annealing furnace is comprised of inlet seal chamber, preheating oven, non-oxidation furnace, No. 1 furnace throat, radiator tube process furnace, soaking pit, No. 2 furnace throats, recycle gas shower cooler, exit seal chambers.Silicon steel heat treatment step is as follows:
1) adopt coke-oven gas type of heating heating preheating oven, non-oxidation furnace, radiator tube process furnace, it is 1000 ℃ that preheating oven is controlled temperature, and it is 1100 ℃ that non-oxidation furnace is controlled temperature, and radiator tube Heating Furnace Control temperature is 900 ℃;
2) adopt resistive heating mode to heat soaking pit, it is 800 ℃ that soaking pit is controlled temperature;
3) the argon hydrogen hybrid protection gas that is full of 80 ﹪ Ar and 20 ﹪ H2 in annealing furnace is swept stove;
4) silicon strip is with 160m/min travelling speed successively by inlet seal chamber, preheating oven, non-oxidation furnace, No. 1 furnace throat, radiator tube process furnace, soaking pit, No. 2 furnace throats, exit seal chamber, and in this process, recycle gas shower cooler constantly sprays 80 ﹪ Ar and 20 ﹪ H2 argon hydrogen hybrid protection gases.
Embodiment 2
A silicon steel heat treating method, silicon steel annealing furnace is comprised of inlet seal chamber, preheating oven, non-oxidation furnace, No. 1 furnace throat, radiator tube process furnace, soaking pit, No. 2 furnace throats, recycle gas shower cooler, exit seal chambers; Silicon steel heat treatment step is as follows:
1) adopt coke-oven gas type of heating heating preheating oven, non-oxidation furnace, radiator tube process furnace, it is 1100 ℃ that preheating oven is controlled temperature, and it is 1200 ℃ that non-oxidation furnace is controlled temperature, and radiator tube Heating Furnace Control temperature is 950 ℃;
2) adopt resistive heating mode to heat soaking pit, it is 900 ℃ that soaking pit is controlled temperature;
3) the argon hydrogen hybrid protection gas that is full of 80 ﹪ Ar and 20 ﹪ H2 in annealing furnace is swept stove;
4) silicon strip is with 180m/min travelling speed successively by inlet seal chamber, preheating oven, non-oxidation furnace, No. 1 furnace throat, radiator tube process furnace, soaking pit, No. 2 furnace throats, exit seal chamber, and in this process, recycle gas shower cooler constantly sprays 80 ﹪ Ar and 20 ﹪ H2 argon hydrogen hybrid protection gases.
Above described in be only ultimate principle of the present invention, not the present invention is imposed any restrictions, everyly according to the present invention, it is carried out to equivalent variations and modification, all within the category of the art of this patent protection scheme.
Claims (4)
1. a silicon steel heat treating method, is characterized in that, silicon steel annealing furnace is comprised of inlet seal chamber, preheating oven, non-oxidation furnace, No. 1 furnace throat, radiator tube process furnace, soaking pit, No. 2 furnace throats, recycle gas shower cooler, exit seal chambers; Silicon steel heat treatment step is as follows:
1) adopt coke-oven gas type of heating heating preheating oven, non-oxidation furnace, radiator tube process furnace, control each stove furnace temperature and reach requirement temperature;
2) adopt resistive heating mode to heat soaking pit and control furnace temperature and reach requirement temperature;
3) in annealing furnace, be full of argon hydrogen hybrid protection gas and sweep stove;
4) silicon strip is with certain travelling speed successively by inlet seal chamber, preheating oven, non-oxidation furnace, No. 1 furnace throat, radiator tube process furnace, soaking pit, No. 2 furnace throats, exit seal chamber, and in this process, recycle gas shower cooler constantly sprays argon hydrogen hybrid protection gas.
2. a kind of silicon steel heat treating method according to claim 1, it is characterized in that, it is 1000 ℃～1100 ℃ that described preheating oven is controlled temperature, it is 1100 ℃～1200 ℃ that non-oxidation furnace is controlled temperature, radiator tube Heating Furnace Control temperature is 900 ℃～950 ℃, and it is 800 ℃～900 ℃ that soaking pit is controlled temperature.
3. a kind of silicon steel heat treating method according to claim 1, is characterized in that, in described argon hydrogen hybrid protection gas, volume percent is 80 ﹪ Ar and 20 ﹪ H2.
4. a kind of silicon steel heat treating method according to claim 1, is characterized in that, described silicon strip travelling speed reaches 160～180m/min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104762450A (en) * | 2015-03-13 | 2015-07-08 | 内蒙古包钢钢联股份有限公司 | Annealing process of producing SPCC continuous-annealing board with silicon steel annealing furnace |
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| JP4403815B2 (en) * | 2004-02-02 | 2010-01-27 | 住友金属工業株式会社 | Continuous heat treatment furnace, steel pipe using the same, and heat treatment method |
| CN102268516A (en) * | 2010-06-07 | 2011-12-07 | 鞍钢股份有限公司 | Decarburization and annealing process of high-carbon middle-and-low-grade cold rolling orientation-free silicon steel |
| CN103305745A (en) * | 2012-03-09 | 2013-09-18 | 宝山钢铁股份有限公司 | Production method for high-quality normalized silicon steel substrate |
| CN103361471A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | Method for reducing strip breakage of oriented silicon steel intermediate annealing |
| CN103725995A (en) * | 2013-12-27 | 2014-04-16 | 东北大学 | Preparation method of oriented high silicon electrical steel |
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- 2014-06-12 CN CN201410260614.3A patent/CN104017964A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4403815B2 (en) * | 2004-02-02 | 2010-01-27 | 住友金属工業株式会社 | Continuous heat treatment furnace, steel pipe using the same, and heat treatment method |
| CN102268516A (en) * | 2010-06-07 | 2011-12-07 | 鞍钢股份有限公司 | Decarburization and annealing process of high-carbon middle-and-low-grade cold rolling orientation-free silicon steel |
| CN103305745A (en) * | 2012-03-09 | 2013-09-18 | 宝山钢铁股份有限公司 | Production method for high-quality normalized silicon steel substrate |
| CN103361471A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | Method for reducing strip breakage of oriented silicon steel intermediate annealing |
| CN103725995A (en) * | 2013-12-27 | 2014-04-16 | 东北大学 | Preparation method of oriented high silicon electrical steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104762450A (en) * | 2015-03-13 | 2015-07-08 | 内蒙古包钢钢联股份有限公司 | Annealing process of producing SPCC continuous-annealing board with silicon steel annealing furnace |
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Application publication date: 20140903 |