CN1032823C - Technology for smelting ultralow-carbon high-chromium alloyed steel by subaerated induction furnace - Google Patents
Technology for smelting ultralow-carbon high-chromium alloyed steel by subaerated induction furnace Download PDFInfo
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- CN1032823C CN1032823C CN 93109254 CN93109254A CN1032823C CN 1032823 C CN1032823 C CN 1032823C CN 93109254 CN93109254 CN 93109254 CN 93109254 A CN93109254 A CN 93109254A CN 1032823 C CN1032823 C CN 1032823C
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Abstract
The present invention relates to a technology for smelting ultralow-carbon high-chromium alloy steel in a bottom-blowing induction furnace. Low-carbon scrap steel and an iron alloy are used as smelting raw materials of the induction furnace; then the mixed gas of O2 and inert gas is blowed into the furnace after the smelting raw materials are completely melted and heated to a certain temperature; different mixed gas proportions are used according to different carbon-content ranges; the carbon content in the steel can reach a target level by controlling the gas blowing time, the temperature, the mixed gas proportion and the flow quantity; a reducing agent is added in a smelting pool after decarbonization is finished to keep a high yield of elements such as chromium, etc. The present invention has the characteristics of simple technology and obvious decarbonizing effect. The technology can be used to smelt ultralow-carbon high-chromium alloy steel whose carbon content is less than or equal to 0.08 and at the lowest equal to 0.01, and a common induction furnace used as a simple smelting device is changed to be a refining device with decarbonizing capacity.
Description
The invention belongs to field of metallurgy, it is applicable to the medium and small sized enterprises of metallurgy, casting and machine building industry, uses induction furnace smelting ultralow-carbon High Chrome Alloy Steel.
At present, the smelting of high chromium steel mainly contains two basic technology routes: electric arc furnace--external refining (for example: EF-AOD, EF-VOD, EF-CLU etc.) and top and bottom combined blown converter--external refining, these two kinds of technologies mainly are applicable to big industrial production, for some small-sized Metallurgical Factories, foundry etc. are widely used to be as smelting equipment induction furnace, but the decarburization capacity of conventional induction furnace smelting process is very low, when producing fine low-carbon (LC) or Ultra-low carbon High Chrome Alloy Steel, can only use price very expensive low (little) carbon source materials and pure metal, this has greatly increased production cost, also limited the product scope of common induction furnace, also have and use vacuum induction oxygen decarburization stove as smelting equipment, but this equipment is huge, complexity, investment is big, the smelting cost height.
Based on above-mentioned deficiency, the present invention is by being blown into oxygen to the bottom-blowing air feed element induction furnace is housed--inert mixed gas, utilize the inert gas dilution deoxidation products, improve the oxygen decarburization capacity, can stably produce the Ultra-low carbon High Chrome Alloy Steel that contains [C]＜=0.03% (minimum 0.01%), the recovery rate of alloying element can remain on higher level (wherein chromium recovery rate＞95%).
Theoretical study results shows: the balance of the carbon chromium in the ferrochrome melt is relevant with temperature of reaction T with carbon monoxide pressure of tension Pco, that is:
21g[％C]－1.5[％Cr]－21gPco＋0.46[％C]＋0.0237[％Ni]
-0.0476[%Cr]=the 24300/T-16.07 formula in: [%C], [%Cr], [%Ni] is respectively carbon in the iron liquid, chromium, the percentage composition T of nickel is a temperature of reaction, Pco is that the dividing potential drop of carbon monoxide is according to following formula, to almost keep under the non-oxidizing condition of chromium nickel element, greatly reduce in the steel carbon content and have only two approach, that is: reduce carbon monoxide pressure of tension (Pco) and raising temperature of reaction, under the common induction furnace smelting condition, Pco=1, this moment, the temperature of reaction of smelting ultralow-carbon High Chrome Alloy Steel was spent up to about 2,000, otherwise chromium is prior to oxidation of coal, obvious common induction furnace body of heater is to bear pyritous like this, be difficult to the smelting ultralow-carbon High Chrome Alloy Steel, thereby can only adopt the method that reduces the CO dividing potential drop, the common method that reduces the CO dividing potential drop is to adopt vacuum, yet vacuum induction furnace apparatus complexity, invest hugely, the smelting cost height is if increase oxygen decarburization equipment again, make equipment and smelting technology more complicated, also be worthless, for decarburization and cr yield effectively, the present invention infeeds a certain proportion of argon oxygen gas mixture in stove, utilize inert gas dilution decarburizing reaction product carbon monoxide in the mixed gas, thereby Pco is reduced, need not use vacuum unit like this, avoided high-temperature operation, realize the target of decarburization and cr yield effectively, obtained the Ultra-low carbon High Chrome Alloy Steel.
Smelting raw materials used is low-carbon waste steel and high, medium and low carbon-iron alloy, and the amount of allocating into of alloying element is identical with common process.
The present invention is used for decarburization smelting ultralow-carbon High Chrome Alloy Steel technology: raw material all melts and reaches (1500-1700 degree centigrade) after the decarburization and cr yield critical temperature of Theoretical Calculation, the mixed gas of oxygen-inertia is gone in the beginning bottom blowing, decarburization and cr yield during the difference carbon content needs different Pco.Thereby the different decarburization stages adopt, and oxygen--the inert mixed gas ratio is respectively: (3--0): (1--3) etc.Reduction phase is blown into pure inert gas, different according to furnace capacity and carbon content, the time in each stage is that 5--40min does not wait, for the 30--1000Kg induction furnace, gas flow scope 1.0--30m3/h.t, pressure is: 0.12--1.0MPa, for improving yield of alloy, reduction period adds reductive agent 1--10Kg/t such as ferrosilicon, ferromanganese, silico-calcium, aluminium.Tap after further adjusting composition.Technology of the present invention can be used for producing the low-carbon (LC) of carbon containing＜=0.08% and the Ultra-low carbon Gao Ge of carbon containing＜=0.03% ([%Cr]=15--35) steel alloy.
For reducing smelting cost, the rare gas element (Ar) of the present invention's use can partly or entirely be replaced by nitrogen, forms oxygen, and--nitrogen mixes and blows or mixed the blowing of oxygen--nitrogen later stage oxygen--argon in early stage, like this, both reach the purpose of decarburization, can reduce the gas cost again, prevented molten steel nitrogen pick-up.
Adopt the present invention, make induction furnace produce low (ultralow) carbon High Chrome Alloy Steel and become possibility, widen induction furnace matallurgical products scope, use the cheap metal raw material to reduce production cost significantly, save refractory consumption rate, improved yield of alloy, reduced power consumption, although rare gas element has a certain amount of consumption, total economic benefit is very considerable.
The refining of little steel melting furnace molten steel is the difficult problem on metallurgical boundary so far, and this technology has solved this technology difficult problem to a certain extent, makes common induction furnace be become the refining unit that possesses the decarburization function by simple melting appartus.
Be that 30kg induction furnace smelting OO Cr21Ni10 uses implementation example of the present invention below:
(1) charging is melted 1650 ℃ and is begun to blow;
(2) fs: O2: Ar=3: 1, flow 0.12m3/h, 5 minutes time;
(3) subordinate phase: O2: Ar=1: 20 minutes 1 time;
(4) phase III: O2: Ar=1: 10 minutes 3 times;
(5) add reductive agent aluminium powder 100g, tap behind the Argon 2min
Composition in the smelting process is changed to:
Molten clear: [%C]=0.17, [%Si]=0.3, [%Mn]=0.67, [%Cr]=22.1
Tapping: [%C]=0.02, [%Si]＜0.3[%Mn]=0.65, [%Cr]=21.5
Bottom blowing airshed: 0.066m3/h.t, pressure: 0.15MPa.
Adopt technology of the present invention, in 30 minutes molten clear carbon can by O.15-0.20% drop to≤0.03%, the recovery rate of chromium＞95%.
Claims (4)
1, induction furnace smelting ultralow-carbon High Chrome Alloy Steel technology, under atmospheric condition, use the argon oxygen gas mixture, dilution reduces carbon monoxide pressure of tension, it is characterized in that in being provided with the induction furnace of bottom-blowing air feed element, returns solid feed such as steel with low-carbon (LC), Gao Ge and carries out melting, when molten steel temperature reaches 1550～1700 centigradetemperatures, oxygen-inert mixed gas is gone in bottom blowing, and its oxygen and rare gas element ratio of mixture are (3～0): (1～3), flow should be 1.0～30.0m mutually
3/ h.t, pressure is 0.12～1.00Mpa, reach the composition requirement after, add reductive agent silico-calcium, ferrosilicon, aluminium powder, tap after adjusting composition.
2,, it is characterized in that described rare gas element is an argon gas according to the described smelting ultralow-carbon high chromium steel of claim 1 technology.
3, rare gas element according to claim 1 is a nitrogen.
4, rare gas element according to claim 1 is the mixture of nitrogen and argon gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93109254 CN1032823C (en) | 1993-08-10 | 1993-08-10 | Technology for smelting ultralow-carbon high-chromium alloyed steel by subaerated induction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93109254 CN1032823C (en) | 1993-08-10 | 1993-08-10 | Technology for smelting ultralow-carbon high-chromium alloyed steel by subaerated induction furnace |
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| Publication Number | Publication Date |
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| CN1085605A CN1085605A (en) | 1994-04-20 |
| CN1032823C true CN1032823C (en) | 1996-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 93109254 Expired - Fee Related CN1032823C (en) | 1993-08-10 | 1993-08-10 | Technology for smelting ultralow-carbon high-chromium alloyed steel by subaerated induction furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100475979C (en) * | 2006-12-29 | 2009-04-08 | 本溪钢铁(集团)有限责任公司 | Method for smelting suprelow carbon steel using ordinary arc furnace |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191357B (en) * | 2010-03-01 | 2012-07-18 | 长春工业大学 | Method and improved device for argonoxygen refining of low-carbon ferrochrome |
| CN102127615B (en) * | 2011-01-25 | 2012-12-26 | 山西太钢不锈钢股份有限公司 | Method for smelting in reduction period of electric furnace steel making |
| CN102127613A (en) * | 2011-02-25 | 2011-07-20 | 河北钢铁股份有限公司承德分公司 | Method for extracting vanadium through composite blowing of converter |
| CN102321783B (en) * | 2011-09-19 | 2013-03-20 | 武汉钢铁(集团)公司 | Steel-making method of experimental induction furnace |
| CN103627973B (en) * | 2013-11-25 | 2015-11-18 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of production method of low-carbon high-chromium steel |
| CN108359913A (en) * | 2018-02-08 | 2018-08-03 | 盐城市鑫洋电热材料有限公司 | A kind of ferromanganese chromium low-carbon alloy and preparation method thereof |
| CN110016535B (en) * | 2019-03-01 | 2021-02-23 | 鞍钢股份有限公司 | Method for improving and stably controlling nitrogen content in stainless steel |
| CN113198985A (en) * | 2021-03-19 | 2021-08-03 | 兴化市广福金属制品有限公司 | Integrated machining device and machining method for stainless steel billets |
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1993
- 1993-08-10 CN CN 93109254 patent/CN1032823C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100475979C (en) * | 2006-12-29 | 2009-04-08 | 本溪钢铁(集团)有限责任公司 | Method for smelting suprelow carbon steel using ordinary arc furnace |
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| CN1085605A (en) | 1994-04-20 |
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