CN103343276B - A kind of Chromium molybdenum iron alloy and preparation method thereof - Google Patents
A kind of Chromium molybdenum iron alloy and preparation method thereof Download PDFInfo
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- CN103343276B CN103343276B CN201310214287.3A CN201310214287A CN103343276B CN 103343276 B CN103343276 B CN 103343276B CN 201310214287 A CN201310214287 A CN 201310214287A CN 103343276 B CN103343276 B CN 103343276B
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Abstract
The present invention relates to Chromium molybdenum iron alloy and preparation method thereof, belong to steely iron alloy field.Does its weight percent consist of: Cr? 40%-60%, Mo? 5%-25%, Fe? 25%-35%, C? 5%-8%, surplus is inevitable impurity element 1-5%, this Chromium molybdenum iron alloy prepare the method adopting and carbon ferrochrome and molybdenum oxide ball direct Reducing and Alloying smelted carbon chromium ferro-molybdenum, it is characterized in that adding in the carbon ferrochrome iron liquid of melting the molybdenum oxide ball that molybdenum calcining is made, add carbon simultaneously and make reductive agent, melting slag making, the molybdenum restored, to ferrochrome DIRECT ALLOYING, finally obtains a kind of carbon chromium molybdenum-iron product; The present invention is applied to the smelting of steel alloy, both can save the operation of producing molybdenum-iron, can reduce again and add molybdenum alloy element cost, shorten smelting cycle; In addition, effectively inhibit the problem that in the independent adding technology of molybdenum oxide, Mo volatilization loss is serious.
Description
Technical field
The present invention relates to Chromium molybdenum iron alloy and preparation method thereof, belong to steely iron alloy field.
Background technology
Developing rapidly with industry, ferrous materials uses increasingly extensive, proposes more higher requirements to the performance of ferrous materials; The basis of carbon steel is added steel alloy that is a certain or certain several a certain amount of alloying element formation, use properties and processing performance improve further; Chromium, molybdenum element, as important alloy element, are usually used in the intensity, elasticity, toughness, wear resistance, the corrosion resistance that improve steel alloy, are widely used in the production of stainless steel, wear resisting steel; In addition chromemolybdenum steel and chrome molybdenum matrix material have good anti-oxidant and thermostrength, increasingly extensive in the application of the industry such as oil, chemical industry.
The smelting of steel alloy mainly adds molten steel by the form of adding iron alloy and metal simple-substance, but energy consumption is high, environmental pollution is serious feature that ferroalloy smelting process has, exploitation does not use iron alloy or has great strategic significance with the steel alloy smelting technology of iron alloy less; In modern STEELMAKING PRODUCTION, Cr mainly adds in steel by carbon ferrochrome, and the interpolation of Mo is then substitute molybdenum-iron with molybdenum oxide lump; How complete in STEELMAKING PRODUCTION, the alloying of chromium, molybdenum element is disposable, and the recovery rate of chrome molybdenum is high again, is the problem to be solved in the present invention.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of novel Chromium molybdenum iron alloy and preparation method thereof, Chromium molybdenum iron alloy of the present invention can be used as the alloyed feedstock of the steel grade produced containing chrome molybdenum element, the disposable interpolation of chrome molybdenum element can be realized, solve the independent alloying Problems existing of current chrome molybdenum.
For the scheme realizing object of the present invention is as follows:
The present invention proposes a kind of Chromium molybdenum iron alloy and preparation method thereof, it is characterized in that: the weight percent of Chromium molybdenum iron alloy consists of: Cr40%-60%, Mo5%-25%, Fe25%-35%, C5%-8%, and surplus is inevitable impurity element 1-5%.
The preparation method of Chromium molybdenum iron alloy of the present invention, is characterized in that adopting and add molybdenum oxide ball in the carbon ferrochrome iron liquid of melting, add carbon and make reductive agent, the molybdenum restored is to ferrochrome DIRECT ALLOYING, meanwhile, add slag former slag refining, remove harmful element and control alloying element oxidation.
Concrete preparation method comprises the following steps:
The first step: carbon ferrochrome, molybdenum oxide ball, calcium oxide, silicon-dioxide and coke are undertaken calculating by the massfraction of effective constituent in each raw material, proportioning;
Second step: added by carbon ferrochrome in electric furnace, fusing, is warming up to 1600-1700 DEG C, adds coke and add unslaked lime and SiO
2slag making, CaO and the SiO in slag dual alkalinity and slag
2the ratio of massfraction control in 1.0 ~ 1.5 scopes;
3rd step: after slag charge is melting down, keeps melting down state 1 ~ 2min, adds molybdenum oxide ball to molten bath, heating, and add molybdenum oxide ball after each molten bath is melting down, all molybdenum oxide balls point are added into stove 2-3 time, and molybdenum ball adds timed interval 1-2min in batches;
4th step: treat that all molybdenum oxide balls add complete, after molten bath is melting down, stop heating, quick tapping cools, and obtains Chromium molybdenum iron alloy and is separated with slag, obtain Chromium molybdenum iron alloy.
The feature of the raw material adopted in above preparation process is:
The main component (weight percentage) of described carbon ferrochrome is for containing Cr50%-65%, C6%-9.5%.
The molybdenum calcining that described molybdenum oxide ball is is 50.53%-55.32% containing molybdenum (weight percentage), granularity 10 ~ 50mm.
Described unslaked lime is containing CaO(weight percentage) be the powdery unslaked lime of 66.5%-90.00%.
Described coke is carbon content (weight percentage) is the metallurgical coke of 80 ~ 87%, and coke size is less than or equal to 10mm.
The feature adopting above raw material to carry out alloying smelting process is: the slagging regime of fusion process adopts single slag process, slag dual alkalinity scope 1.0 ~ 1.5, and unslaked lime, SiO
2add in stove with coke simultaneously, after molten bath is melting down, stop heating immediately, slag and the cooling of iron quick tapping.
For realizing and ensureing effect of the present invention, it should be added that:
1) in the carbon ferrochrome iron liquid adopted, carbon reaches capacity substantially, utilizes existing carbon and join carbonaceous reducing agent outward effectively to improve reduction efficiency, and carbon low price, effectively can reduce production cost.
2) in order to improve molybdenum oxide alloying effect, molybdenum oxide ball is repeatedly added in batches, object avoids the disposable interpolation of molybdenum oxide ball to cause bath temperature significantly to decline, simultaneously by improving impeller in slurry pump interfacial area, molybdenum oxide is reduced rapidly and enters in iron liquid, thus improve the reduction reaction efficiency of molybdenum oxide, reduce the volatilization of molybdenum oxide, improve the recovery rate of Mo.
3) the inventive method production Chromium molybdenum iron alloy is adopted can to carry out in the electric furnace of routine, as: single-phase arc funace, three-phawse arc furnace, medium-frequency induction furnace etc. all belong to the technical scheme that the present invention will protect.
In the Chromium molybdenum iron alloy produced according to the inventive method, the weight percent content of Cr, Mo, Fe can calculate by material composition and carry out the Chromium molybdenum iron alloy product that proportioning obtains containing 40 ~ 60Crwt%, 5 ~ 25wt%Mo, 25 ~ 30wt%Fe, and wherein the recovery rate of Mo in metal product reaches about 90%.
Compared with prior art, the present invention has the following advantages and effect:
1) by Chromium molybdenum iron alloy product application in STEELMAKING PRODUCTION, realize the disposable interpolation of chromium, molybdenum element; Both can save the operation of producing molybdenum-iron, and can reduce again and add alloying element cost, shorten smelting cycle.
2) use coke to make reductive agent, effectively make use of the feature that in carbon ferrochrome iron liquid, carbon is saturated, reduce production cost.
3) the Chromium molybdenum iron alloy product that the present invention obtains effectively solves steel mill's molybdenum oxide ball in molybdenum oxide ball adding procedure and is difficult to sink down into the problem that iron liquid causes volatilization loss serious.
4) slagging regime in the present invention effectively protects molten bath, plays covering effect to the reduction reaction of molybdenum oxide, effectively inhibits molybdenum oxide vaporization behaviors at high temperature.
5) in the present invention, molybdenum ball point 2-3 batch adds, and effectively keeps bath temperature, and relatively increases molybdenum oxide reduction reaction rate, and improve the recovery rate of Mo, the recovery rate of Mo in metal product reaches more than 90%.
In sum, the invention provides a kind of Chromium molybdenum iron alloy product and production method thereof, have broad application prospects.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is further described; Embodiment only for illustration of the present invention, instead of limits the present invention by any way.
embodiment 1the inventive method is adopted to produce the Chromium molybdenum iron alloy containing Mo10%, Cr50%
Get carbon ferrochrome (Cr=56.11wt%, C=6.5wt%) the molybdenum oxide ball (Mo=52.53wt% that makes of 4kg, molybdenum calcining, granularity 10 ~ 50mm) 1.12kg, calcium oxide (unslaked lime is converted into calcium oxide) 400g, silicon-dioxide 300g, coke 200g, carbon content 85%; Put into by carbon ferrochrome in medium-frequency induction furnace, heat fused, be warming up to 1600 DEG C, add coke and calcium oxide, silicon-dioxide slag making, slag dual alkalinity is 1.35; After slag charge is melting down, keep melting down state 1min, add molybdenum oxide ball to molten bath, heating, add molybdenum oxide ball after each molten bath is melting down, all molybdenum oxide balls point are added into stove 2 times, add timed interval 2min; After, molten bath complete until all molybdenum oxide ball interpolations is melting down, stop heating, quick tapping, cooling; Slag gold is separated, and the Chromium molybdenum iron alloy obtained, its Ingredient percent content is respectively Cr49.68wt%, Mo10.02wt%, Fe30.24wt%, C8.00%, and surplus is impurity 2.06%, and composition is in allowed band.
embodiment 2the inventive method is adopted to produce the Chromium molybdenum iron alloy of Mo25%, Cr40%
Get carbon ferrochrome (Cr=56.11wt%, C=6.5wt%) the molybdenum oxide ball (Mo=52.53wt% that makes of 4kg, molybdenum calcining, granularity 10 ~ 50mm) 2.2kg, calcium oxide (unslaked lime is converted into calcium oxide) 450g, silicon-dioxide 300g, coke 300g, carbon content 85%; Put into by carbon ferrochrome in medium-frequency induction furnace, heat fused, be warming up to 1700 DEG C, add coke and calcium oxide, silicon-dioxide slag making, slag dual alkalinity is 1.50; After slag charge is melting down, keep melting down state 2min, add molybdenum oxide ball to molten bath, heating, add molybdenum oxide ball after each molten bath is melting down, all molybdenum oxide balls point are added into stove 3 times, add timed interval 1min; After, molten bath complete until all molybdenum oxide ball interpolations is melting down, stop heating, quick tapping, cooling; Slag gold is separated, and obtain Chromium molybdenum iron alloy, its Ingredient percent content is Cr40.09wt%, Mo24.87wt%, Fe25.42wt%, C5.80%, and surplus is impurity 3.82%, and composition is in allowed band.
Claims (7)
1. a Chromium molybdenum iron alloy, as the alloyed feedstock of the steel grade produced containing chrome molybdenum element, realize the disposable interpolation of chrome molybdenum element, it is characterized in that: the weight percent of described Chromium molybdenum iron alloy consists of: Cr40%-60%, Mo5%-25%, Fe25%-35%, C5%-8%, surplus is inevitable impurity element 1-5%.
2. the preparation method of a kind of Chromium molybdenum iron alloy as claimed in claim 1, it is characterized in that: adopt and add molybdenum oxide ball in the carbon ferrochrome iron liquid of melting, add carbon and make reductive agent, the molybdenum restored is to ferrochrome DIRECT ALLOYING, simultaneously, add slag former slag refining, remove harmful element and control alloying element oxidation.
3. the preparation method of a kind of Chromium molybdenum iron alloy as claimed in claim 2, is characterized in that comprising the steps:
The first step: carbon ferrochrome, molybdenum oxide ball, calcium oxide, silicon-dioxide and coke are undertaken calculating by the massfraction of effective constituent in each raw material, proportioning;
Second step: added by carbon ferrochrome in electric furnace, fusing, is warming up to 1600-1700 DEG C, adds coke and add unslaked lime and SiO
2slag making, CaO and the SiO in slag dual alkalinity and slag
2the ratio of massfraction control in 1.0 ~ 1.5 scopes;
3rd step: after slag charge is melting down, keeps melting down state 1 ~ 2min, adds molybdenum oxide ball to molten bath, heating, and add molybdenum oxide ball after each molten bath is melting down, all molybdenum oxide balls point are added into stove 2-3 time, and molybdenum ball adds timed interval 1-2min in batches;
4th step: treat that all molybdenum oxide balls add complete, after molten bath is melting down, stop heating, quick tapping cools, and obtains Chromium molybdenum iron alloy and is separated with slag, obtain Chromium molybdenum iron alloy.
4. the preparation method of a kind of Chromium molybdenum iron alloy as claimed in claim 2, is characterized in that: the main component (weight percentage) of described carbon ferrochrome is for containing Cr50%-65%, C6%-9.5%.
5. the preparation method of a kind of Chromium molybdenum iron alloy as claimed in claim 2, is characterized in that: the molybdenum calcining that described molybdenum oxide ball is is 50.53%-55.32% containing molybdenum (weight percentage), granularity 10 ~ 50mm.
6. the preparation method of a kind of Chromium molybdenum iron alloy as claimed in claim 3, is characterized in that: described unslaked lime is containing CaO(weight percentage) be the powdery unslaked lime of 66.5%-90.00%.
7. the preparation method of a kind of Chromium molybdenum iron alloy as claimed in claim 3, is characterized in that: described coke is carbon content (weight percentage) is the metallurgical coke of 80 ~ 87%, and coke size is less than or equal to 10mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103667690B (en) * | 2013-12-16 | 2016-01-20 | 江苏大学 | The method of chrome-molybdenum metal self reduction pellet and preparation and DIRECT ALLOYING molten steel |
| CN105907953A (en) * | 2016-06-01 | 2016-08-31 | 内蒙古科技大学 | Molybdenum ore alloying metallurgy method |
| RU2631776C1 (en) * | 2016-09-23 | 2017-09-26 | Юлия Алексеевна Щепочкина | Alloy for alloying cast iron |
| CN108385009A (en) * | 2018-04-13 | 2018-08-10 | 盐城市鑫洋电热材料有限公司 | A kind of preparation method of ferrochrome molybdenum alloy |
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| JPS63250439A (en) * | 1987-04-06 | 1988-10-18 | Nkk Corp | Manufacture of low-titanium and high-carbon ferrochrome |
| CN1946876A (en) * | 2004-02-16 | 2007-04-11 | 凯文·弗朗西斯·道曼 | Hardfacing ferroalloy materials |
| CN1974828A (en) * | 2006-12-11 | 2007-06-06 | 四川川投峨眉铁合金（集团）有限责任公司 | Ultralow-titanium high-carbon ferrochromium alloy and production method thereof |
| RU2334001C1 (en) * | 2007-01-09 | 2008-09-20 | Юлия Алексеевна Щепочкина | Alloy on chrome basis |
| CN101962714A (en) * | 2010-10-25 | 2011-02-02 | 中钢集团吉林铁合金股份有限公司 | Production method of low-silicon low-titanium and high-carbon ferrochrome smelted by submerged arc furnace |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63250439A (en) * | 1987-04-06 | 1988-10-18 | Nkk Corp | Manufacture of low-titanium and high-carbon ferrochrome |
| CN1946876A (en) * | 2004-02-16 | 2007-04-11 | 凯文·弗朗西斯·道曼 | Hardfacing ferroalloy materials |
| CN1974828A (en) * | 2006-12-11 | 2007-06-06 | 四川川投峨眉铁合金（集团）有限责任公司 | Ultralow-titanium high-carbon ferrochromium alloy and production method thereof |
| RU2334001C1 (en) * | 2007-01-09 | 2008-09-20 | Юлия Алексеевна Щепочкина | Alloy on chrome basis |
| CN101962714A (en) * | 2010-10-25 | 2011-02-02 | 中钢集团吉林铁合金股份有限公司 | Production method of low-silicon low-titanium and high-carbon ferrochrome smelted by submerged arc furnace |
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