EP3497249A1 - Procédé de fabrication d'un alliage de ferrochrome à teneur souhaitée en manganèse, nickel et molybdène - Google Patents

Procédé de fabrication d'un alliage de ferrochrome à teneur souhaitée en manganèse, nickel et molybdène

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Publication number
EP3497249A1
EP3497249A1 EP17746154.8A EP17746154A EP3497249A1 EP 3497249 A1 EP3497249 A1 EP 3497249A1 EP 17746154 A EP17746154 A EP 17746154A EP 3497249 A1 EP3497249 A1 EP 3497249A1
Authority
EP
European Patent Office
Prior art keywords
feed mix
process according
nickel
feed
manganese
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17746154.8A
Other languages
German (de)
English (en)
Inventor
Pasi MÄKELÄ
Petri PALOVAARA
Sauli PISILÄ
Jarmo Saarenmaa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Outotec Finland Oy
Original Assignee
Outotec Finland Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Outotec Finland Oy filed Critical Outotec Finland Oy
Publication of EP3497249A1 publication Critical patent/EP3497249A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5264—Manufacture of alloyed steels including ferro-alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C35/00—Master alloys for iron or steel
    • C22C35/005—Master alloys for iron or steel based on iron, e.g. ferro-alloys
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to a process for manu- facturing ferrochromium alloy with desired content of manganese, nickel and molybdenum.
  • Desired means in this context the composition of the ferrochrome alloy that results from the process.
  • the main components of stainless steels are iron and chromium and depending on the type of stainless steel additionally at least one of nickel, manganese and molybdenum.
  • Stainless steels are typically categorized to ferritic (e.g. AISI 400), austenitic (e.g. AISI 200, 300) and to duplex series.
  • Duplex stainless steels are having properties from ferritic and austenitic steels. Chromium content in stainless steel is over 10.5 wt-%.
  • Certain stainless steel grades also comprise manganese, such as the 200 series, where nickel is at least partly substituted by manganese.
  • the manganese source is typ- ically ferromanganese, silicomanganese or electrolytic manganese.
  • the nickel content in austenitic 300 series stainless steel is most between 8 and 12 wt-% but there is variation between different grades. For example in the 200 series the nickel content is lower, typically at 0 to 7 wt-% and in certain special stainless steel up to 30 wt-%.
  • Nickel is an expensive raw material and its availability and price varies with time.
  • Nickel sources used in stainless steel making are typically acid-proof scrap, ferronickel and pure nickel cathodes.
  • melt batch of a lean 300 series stainless steel from scrap metals can be following: 50 wt-% of 300 series scrap (18 wt-%Cr, 8 wt-% Ni, 1 wt-% Mn) ; 30 wt-% of carbon steel scrap (mostly Fe) ; 14 wt-% of high carbon FeCr (7 wt- %C, 65 wt-% Cr) ; 4 wt-% of nickel briquettes (mostly Ni) and 1 wt-% high carbon FeMn (7 wt-%, 65 wt-% Mn) .
  • This mixture will end up in composition of about 18 wt-% Cr, 8 wt-% Ni, 1 wt-% Mn and 1 wt-%
  • Chromium form a surface film of chromium oxide to make the stainless steel corrosion resistant. Chro- mium also increases the scaling resistance at elevated temperatures .
  • Nickel stabilizes the austenitic structure and increases ductility, making stainless steel easier to form. Nickel also increases high temperature strength and corrosion resistance, particularly in industrial and marine atmospheres, chemical, food and textile pro ⁇ cessing industries.
  • Manganese promotes the stability of austenite, at or near room temperature and improves hot rolling properties. Addition of up to 2 wt-% manganese has no effect on strength, ductility and toughness. Manganese is important as a partial or complete replacement of nickel in 200 series austenitic stainless grades.
  • Molybdenum increases corrosion resistance, strength at elevated temperatures, and creep resistance. It expands the range of passivity and counteracts ten ⁇ dency to pit especially in chloride environments.
  • An object of the invention is to provide an improved process for the manufacture of ferrochromium alloy with desired content of manganese, nickel and mo ⁇ lybdenum, which is characterised by high recovery of desired elements such as chromium, iron, manganese, nickel and molybdenum.
  • the terms relating in "ferrochromium alloy with desired content of manganese, nickel and molyb ⁇ denum” are abbreviated as “FeCrMn”, “FeCrNi”, “FeCrMo”, “FeCrNiMo”, “FeCrMnMo”, “FeCrMnNi” and “FeCrMnNiMo” .
  • the ferrochromium alloy contains typically also carbon, silicon and also other elements that are less stable as oxide form in a reducing and high temperature conditions and do not evaporate in smelting conditions.
  • the invention relates to a process for manu ⁇ facturing ferrochromium alloy with desired content of manganese, nickel, and molybdenum, wherein the process comprising the steps of:
  • the feed mix containing iron bearing material and chromium bearing material in an amount sufficient to provide iron content between 5 and 75 wt-% in the feed mix and sufficient to provide chromium content between 5 and 70 wt-% in the feed mix;
  • the feed mix containing manganese bearing raw ma ⁇ terial in an amount sufficient to provide a manga ⁇ nese content between 0 and 70 wt-% in the feed mix;
  • the feed mix can contain iron bearing material in an amount sufficient to provide an iron content be ⁇ tween 5 and 75 wt-% in the feed mix, preferably between 10 and 50 wt-% in the feed mix, more preferably between 10 and 45 wt-% in the feed mix, even more preferable between 10 and 30 wt-% in the feed mix.
  • the feed mix can contain chromium bearing ma ⁇ terial in an amount sufficient to provide a chromium content between 5 and 70 wt-% in the feed mix, preferably between 12 and 50 wt-% in the feed mix, more preferably between 12 and 35 wt-% in the feed mix.
  • the feed mix can contain manganese bearing raw material in an amount sufficient to provide a manganese content between 0.01 and 70 wt-% in the feed mix; pref ⁇ erably between 0.01 and 40 wt-% in the feed mix, more preferably between 0.01 and 30 wt-% in the feed mix, even more preferably between 0.01 and 25 wt-% in the feed mix.
  • the feed mix can contain nickel bearing raw material in an amount sufficient to provide a nickel content between 0.01 and 50 wt-% in the feed mix; pref ⁇ erably between 0.01 and 30 wt-% in the feed mix, more preferably between 0.01 and 25 wt-% in the feed mix, even more preferably between 0.01 and 20 wt-% in the feed mix.
  • the feed mix can contain molybdenum bearing raw material in an amount sufficient to provide a molybdenum content between 0.01 and 40 wt-% in the feed mix, pref ⁇ erably between 0.01 and 30 wt-%, in the feed mix more preferably between 0.01 and 10 wt-% in the feed mix.
  • the smelting feed can be in an agglomerated form or an unagglomerated form or mixture of them.
  • copper and and/or niobium is alloyed in small quantities (in major stainless steel grades copper is an impurity) .
  • copper-bearing raw materials may also be added as an agglomerated feed or as a fine feed to the smelting.
  • the feed mix may contain copper bearing raw material in an amount sufficient to provide a copper content between 0.01 and 30 wt-%, preferably 0.5 and 30 wt-%, more preferably 0.5 and 10 wt-%, most preferably between 0.5 and 5 wt-% in the feed mix.
  • the feed mix may contain niobium (also referred as colum ⁇ bium) bearing raw material in an amount sufficient to provide a niobium content between 0.01 and 30 wt-%, preferably between 0.5 and 30 wt-%, more preferably be- tween 0.5 and 10 wt-%, most preferable between 0.5 and 5 wt-% in the feed mix.
  • niobium also referred as colum ⁇ bium bearing raw material in an amount sufficient to provide a niobium content between 0.01 and 30 wt-%, preferably between 0.5 and 30 wt-%, more preferably be- tween 0.5 and 10 wt-%, most preferable between 0.5 and 5 wt-% in the feed mix.
  • Cop ⁇ Copper is added to stainless steels to increase their resistance to certain corrosive environments. Cop ⁇ per also decreases susceptibility to stress corrosion cracking and provides age-hardening effect.
  • Niobium combines with carbon to reduce suscep ⁇ tibility to intergranular corrosion. Niobium acts as a grain refiner and promotes the formation of ferrite.
  • the manganese, nickel and molybdenum content in the smelting feed may be selected based on the end product (stainless steel) requirements so that the con- sumption of the traditional (typically expensive) al ⁇ loying elements is minimized in the following refining stages of the stainless steel (converting, alloying) .
  • the produced ferrochromium alloy with desired con- tent of manganese, nickel and molybdenum can be later refined and/or diluted with scrap addition and/or al ⁇ loyed with traditional alloying substances in the down ⁇ stream process steps. Examples of compositions of stain ⁇ less steel grades are presented in Tables 1-4.
  • All raw materials used in the process according to the invention may contain certain impurities (typical slag formers) , such as AI2O3, MgO, CaO, S1O2 and similar oxides to these. Similar compounds are also contained in the chromite concentrate and fluxing agents used in the conventional FeCr smelting. Therefore, those impu ⁇ rities need not be removed from the raw materials when directed to smelting stage. This enables the use of low cost manganese, nickel and molybdenum sources compared to the use of highly refined alloying elements used in traditional stainless steel production, such as FeMn, SiMn, FeNi or FeMo . The consumption of traditional al ⁇ loying elements is decreased according to the invention.
  • impurities typically slag formers
  • Similar compounds are also contained in the chromite concentrate and fluxing agents used in the conventional FeCr smelting. Therefore, those impu ⁇ rities need not be removed from the raw materials when directed to smelting stage. This enables the use of
  • the manganese bearing raw material is a solid compound, typically manganese ore or manganese ore con ⁇ centrate.
  • Manganese may exist as manganese oxide, man ⁇ ganese hydroxide, metallic manganese, manganese car ⁇ bonate, manganese sulphide, manganese sulphates manga- nese salts or similar compounds and any mixtures of them.
  • the manganese-bearing raw material can contain, for instance, calcinated molybdenum bearing material.
  • the nickel-bearing raw material is a solid com ⁇ pound and typically contains at least part of the fol- lowing: nickel hydroxides, nickel carbonates, nickel oxides, nickel sulphides, metallic nickel, nickel sul ⁇ phates or other compounds, and any mixtures of thereof and/or known nickel salts.
  • the nickel-bearing raw mate ⁇ rial can contain, for instance, calcinated nickel con- centrate from sulfidic ore beneficiation, or an inter ⁇ mediate product from hydrometallurgical process steps of lateritic nickel ore processing.
  • the molybdenum bearing raw material is a solid compound, typically molybdenum ore or molybdenum ore concentrate.
  • Molybdenum may exist as molybdenum oxide, molybdenum hydroxide, molybdenum salt, metallic molyb- denum, molybdenum carbonate, molybdenum sulphide, mo ⁇ lybdenum sulphates or similar compounds and any mixtures of them.
  • Molybdenum source can be also originating as an intermediate product from chemical industry or from beneficiation process.
  • the molybdenum-bearing raw mate ⁇ rial can contain, for instance, calcinated molybdenum bearing material.
  • the copper-bearing raw material is a solid com ⁇ pound, typically copper ore or copper ore concentrate. Copper may exist as copperoxide, coppersulphide, cop- persulphate, metallic copper, copperhydroxide, copper- salts or similar compounds or any mixtures of them.
  • the smelting vessel for the smelting feed can be any kind of, where smelting and reducing energy orig- inating from chemical and/or electrical energy.
  • the smelting vessel can for example be a furnace vessel of an AC, DC, or induction electric furnace or gas heated furnaces or oxidizable substance heated furnaces.
  • the smelting feed for production of ferrochromium alloy with desired content of manganese, nickel and molybdenum is as a form of agglomerates, more preferably as sintered pellets and are preferably di ⁇ rected to preheating prior to submerged arc furnace smelting and reduced with carbon based reductant.
  • the smelting feed can be also reduced with re ⁇ ducing gases but more preferably by carbon to gain de ⁇ sired reduction degree of the smelting feed.
  • Energy for smelting can be provided by chemical energy or/and by electrical energy; preferably in a sub- merged electric arc furnace if smelting feed is as a form of mechanically durable agglomerates.
  • the smelting can be conducted in an open/semiopen bath method if the smelting feed is too fine to ensure proper gas flow from the reaction zone.
  • the smelting feed in preceding process can be pretreated prior to smelting such methods as grinding, agglomeration, drying, calcinating, heat-treatment, prereduction, preheating, and similar to these processes and any combination of these processes.
  • smelting feed according to the invention further comprises at least one fluxing agent as defined herein.
  • Preferable fluxing agents com ⁇ prise silicon, aluminium, calcium and magnesium bearing materials or any mixture thereof.
  • Such flux materials include e.g. quartz, bauxite, olivine, wollastonite, lime, and dolomite. Mixture of the flux materials men ⁇ tioned above may be used depending on the ratio of slag forming components in the smelting feed without the fluxes .
  • smelting feed is agglomerates or lumpy ore which are reduced with carbon reductant.
  • Submerged arc AC furnace is utilized with preheating kiln.
  • quartz is used as a primary fluxing agent.
  • other fluxes such as limestone, olivine, bauxite, or dolomite may be added for adjusting the slag chemistry.
  • the smelting feed as an agglomerated feed or a lumpy feed or a fine feed mix may also contain the mixture of them.
  • the fine mix feed as a smelting feed may also contain lumpy feed materials as an additional feed material as desired fluxes, reduct ⁇ ant, possible residuals or pyrometallurgical slags.
  • carbonaceous material stands for any compound serving as a source of elemental carbon which can undergo oxi- dation to carbon dioxide in metallurgical processes such as smelting.
  • Typical examples for carbonaceous material are carbides, coke, char, coal, and anthracite and the combination of thereof.
  • the novel ferrochromium alloy (with desired content of manganese, nickel and molybdenum) production technology described herein is based on using the iron, chromium, bearing feed mix as the smelting feed with variable content of at least one of the following ele ⁇ ments: manganese, nickel and molybdenum.
  • the composition of the feed mix is advantageous for smelting because due to its manganese, nickel and molybdenum content.
  • the use of these feed materials reduces the smelting process energy per tapped ferrochromium alloy, enhances energy efficiency and enables high productivity. It has been observed that the smelting feed containing manganese, nickel or molybdenum reduces more easily in solid state reduction, as the reducing gases, such as CO, reduce the feed material more aggressively than in the case of normal ferrochrome smelting. Another benefit is that especially the combination of manganese and nickel in the ferrochromium alloy lowers the alloy liquidus tem ⁇ perature compared to traditional FeCr smelting.
  • the feed mix containing in percentages of mass containing in percentages of mass:
  • the feed mix con ⁇ taining in percentages of mass • Ni 1.0 to 30 wt-%, preferably 2 to 26 wt-%, more preferably 2 to 24 wt-%, most pref ⁇ erably 2 to 20 wt-%,
  • the feed mix containing in percentages of mass containing in percentages of mass:
  • the feed mix containing in percentages of mass containing in percentages of mass:
  • the feed mix containing in percentages of mass containing in percentages of mass:
  • Nb 0.5 to 30 wt-%, preferably 1 to 10 wt-%, more preferably 1 to 5 wt-%,
  • the feed mix containing in percentages of mass: • Mn 1.0 to 35 wt-%, preferably 2 to 25 wt-%, more preferably 2 to 20 wt-%,
  • the feed mix containing in percentages of mass containing in percentages of mass:
  • ⁇ Mn 1.0 to 35 wt-%, preferably 2 to 25 wt-%, more preferably 2 to 20wt-%,
  • Ni 1.0 to 30 wt-%, preferably 1 to 26 wt-%, more preferably 1 to 24 wt-%, most preferably 1 to 20 wt-%,
  • the feed mix con ⁇ taining in percentages of mass con ⁇ taining in percentages of mass:
  • the feed mix con- taining in percentages of mass • Ni 1.0 to 30 wt-%, preferably 2 to 26 wt-% more preferably 2 to 24 wt-%, most pref ⁇ erably 2 to 20 wt-%,
  • the feed mix con ⁇ taining in percentages of mass con ⁇ taining in percentages of mass:
  • the feed mix con ⁇ taining in percentages of mass con ⁇ taining in percentages of mass:
  • the feed mix con ⁇ taining in percentages of mass • Nb 0.5 to 30 wt-%, preferably 1 to 10 wt-%, more preferably 1 to 5 wt-%,
  • the feed mix con ⁇ taining in percentages of mass con ⁇ taining in percentages of mass:
  • Mn 1.0 to 35 wt-%, preferably 2 to 25 wt-%, more preferably 2 to 20 wt-%, ⁇ Ni 1.0 to 30 wt-%, preferably 1 to 26 wt-%, more preferably 1 to 24 wt-%, most pref ⁇ erably 1 to 20 wt-%,
  • the feed mix con ⁇ taining in percentages of mass is Fe, Cr and inevitable impurities such as Ti, V, S, Mg, Ca, Si, and Al .
  • Mn 1.0 to 35 wt-%, preferably 2 to 25 wt-%, more preferably 2 to 20 wt-%,
  • the feed mix containing in percentages of mass:
  • One reason for using the selected manganese content is that a high compressive strength is achieved at a low heat-treatment temperature, which means that the energy needed in the heat-treatment is low.
  • cheap manganese sources can be utilized in the production of certain stainless steels.
  • Manganese also replaces expensive nickel in (austenic) stainless steel. Both magnanese and nick-el in FeCr lowers the liquidus point of the ferroal-loy.
  • a high Manganese amount en ⁇ hances reducibility of the heat treated agglomerates One reasons for using the selected nickel content is that every added nickel enhances the pro-cess chain. A Higher amount of nickel is not needed, because manganese bearing stainless steels are to replace nickel. However, higher nickel amounts are suitable. Additionally low cost nickel bearing material can be used to produce metallic Ni into ferroalloy.
  • the feed mix con ⁇ taining in percentages of mass con ⁇ taining in percentages of mass:
  • Ni 2 to 30 wt-% preferably 1 to 20 wt-%, more preferably 2 to 12 wt-%, • Mo below 30 wt-%,
  • Manganase in FeCrNi FeCrNi
  • Add- ing manganese minimizes the need of additional fluxes.
  • manganese decreases the liqui-dus of the metal.
  • nickel mixed and bound together with iron and chro- mium bearing material is advantageous and enhances the process, especially in the reducing stage. Additionally, a vast amount of stainless steel contains nickel as a base metal and every add-ed nickel amount is preferable for the whole process chain.
  • the feed mix con ⁇ taining in percentages of mass con ⁇ taining in percentages of mass:
  • the balance being Fe, Cr and inevitable impurities such as Ti, V, S, Mg, Ca, Si, and Al .
  • nickel bearing mate-rial can be used to produce metallic Ni into ferroalloy.
  • the feed mix con- taining in percentages of mass in an embodiment of the process, the feed mix con- taining in percentages of mass:
  • Ni 1 to 30 wt-% preferably 1 to 20 wt-%, more preferably 2 to 12 wt-% ⁇ Mo below 30 wt-%,
  • Manganase in FeCrNi FeCrNi
  • Add ⁇ ing manganese minimizes the need of additional fluxes.
  • manganese decreases the liquidus of the metal.
  • nickel con ⁇ tent One reasons for using the selected nickel con ⁇ tent is that nickel mixed and bound together with iron and chromium bearing material is advantageous and en ⁇ hances the process, especially in the reducing stage. Additionally, a vast amount of stainless steel contains nickel as a base metal and every add-ed nickel amount is preferable for the whole process chain.
  • the chro ⁇ mium bearing raw material is not 100 % chromium, that the iron bearing raw material is not 100 % iron, that the optional manganese bearing raw material is not 100 % manganese, that the optional nickel bearing raw mate ⁇ rial is not 100 % nickel, that the optional molybdenum bearing raw material is not 100 % molybdenum, the op ⁇ tional copper bearing raw material is not 100 % copper, and that the optional niobium bearing raw material is not 100 % niobium, which means that any one of said raw materials can contain other elements and in some cases these elements can be stated to be impurities leading to that the agglomeration feed will consequently contain additionally other elements as impurities, i.e.
  • compo- nents which are not actively added to the agglomeration feed.
  • These other elements as impurities in some cases can varied in the composition from couple of part of million to several percentages of the added material.
  • chromium bearing material can also contain some manganese within concluding that the materials can contain simultaneously several elements both as desired and as impurities.
  • a process balance model was constructed, simulating the typical ferrochrome smelt ⁇ ing process with a 100 000 tpa FeCr alloy production.
  • the sintered pellets comprises of chromite con- centrate (no manganese or nickel addition) .
  • a process balance model was constructed, sim ⁇ ulating the novel process with a 100 000 tpa FeCrMn alloy production.
  • the sintered pellets are used as the main feed material.
  • the sintered pellets comprises 70 wt-% of chromite concentrate and 30 wt-% of manganese ore (carbonate based ore) . This addition results in a sintered pellet with 16.0 wt-% of manganese content.
  • Alloy composition is 31.4 wt-% Fe, 33.2 wt-% Cr, 26.3 wt-% Mn, 6 to 9wt-% C, because the amount of carbon can fluctuate in the process, and 3.0 wt-% Si.
  • a process balance model was constructed, sim ⁇ ulating the novel process with a 100 000 tpa FeCrMnNi alloy production.
  • the sintered pellets comprises 40 wt-% of chromite concentrate, 31 wt-% of manganese ore (carbonate based ore) and 29 wt-% of nickel hydroxide. This addition results in a sintered pellet with 17.5 wt- % manganese content and 16.1 wt-% nickel content.
  • Alloy composition is 20.9 wt-% Fe, 19.5 wt-% Cr, 25.5 wt-% Mn, 25.1 wt-% Ni, 5 to 8 wt-% C, because the amount of carbon can fluctuate in the pro ⁇ cess, and 3.0 wt-% Si.
  • the best scenario is clearly the production of the FeCrMnNi alloy as the energy consump ⁇ tion / t of alloy is reduced by about 30 % to the traditional FeCr alloy production.
  • Energy is typically the one of the major OPEX component in smelting furnace operation .
  • Another major benefit of the novel process is that the manganese, nickel and molybdenum sources are signifi ⁇ cantly cheaper to the sources used in the stainless steel alloying step.
  • manganese, nickel and molybdenum are already included cost effec ⁇ tively in the alloy going into the stainless steel man ⁇ ufacturing process.
  • ferrochromium alloy smelting is integrated with stainless steel plant, at least part of the ferrochromium alloy production can be directed to the stainless steel plant as a molten phase, which is even more cost-effective.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un alliage de ferrochrome à teneur souhaitée en manganèse, nickel et molybdène qui comprend les étapes consistant à fournir un matériau d'apport aggloméré ou fin comprenant un matériau contenant du fer et du chrome, et au moins l'un des éléments suivants : un matériau brut contenant du manganèse, un matériau brut contenant du nickel et un matériau brut contenant du molybdène en quantités suffisantes pour obtenir une teneur en manganèse comprise entre 0,0 et 70,0 % en poids ; une teneur en nickel comprise entre 0,0 et 50,0 % en poids et éventuellement une teneur en molybdène comprise entre 0,0 et 40,0 % en poids. Par conséquent, l'apport de fusion est fondu avec un agent de réduction et un matériau de flux pour obtenir un alliage de ferrochrome à teneur souhaitée en manganèse, nickel et molybdène qui peut être utilisé, par exemple, dans la fabrication d'acier inoxydable présentant de différentes qualités.
EP17746154.8A 2016-07-11 2017-07-10 Procédé de fabrication d'un alliage de ferrochrome à teneur souhaitée en manganèse, nickel et molybdène Withdrawn EP3497249A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20165580 2016-07-11
PCT/FI2017/050528 WO2018011467A1 (fr) 2016-07-11 2017-07-10 Procédé de fabrication d'un alliage de ferrochrome à teneur souhaitée en manganèse, nickel et molybdène

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EP3497249A1 true EP3497249A1 (fr) 2019-06-19

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Country Status (6)

Country Link
EP (1) EP3497249A1 (fr)
CN (1) CN109477155A (fr)
BR (1) BR112019000146A2 (fr)
CA (1) CA3029886A1 (fr)
EA (1) EA201990103A1 (fr)
WO (1) WO2018011467A1 (fr)

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CN110373602A (zh) * 2019-07-31 2019-10-25 游峰 一种母合金添加剂及其制备方法与应用
CN114381572A (zh) * 2021-12-07 2022-04-22 安阳钢铁股份有限公司 一种氧化钼直接合金化工艺

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FI123241B (fi) * 2011-06-13 2013-01-15 Outokumpu Oy Menetelmä pelkistymisasteen parantamiseksi ferroseosta sulatettaessa
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CN110777293A (zh) * 2019-09-24 2020-02-11 王应青 一种低硅低钛高碳铬铁合金及其制备方法

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CN109477155A (zh) 2019-03-15

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