US3565610A - Vanadium-containing alloying additive for steel - Google Patents

Vanadium-containing alloying additive for steel Download PDF

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Publication number
US3565610A
US3565610A US731272A US3565610DA US3565610A US 3565610 A US3565610 A US 3565610A US 731272 A US731272 A US 731272A US 3565610D A US3565610D A US 3565610DA US 3565610 A US3565610 A US 3565610A
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United States
Prior art keywords
vanadium
steel
additive
bath
carbon
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.)
Expired - Lifetime
Application number
US731272A
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English (en)
Inventor
Hans-Joachim Retelsdorf
Rudolf Fichte
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.)
ELEKTROMETALLURGIE GmbH
Gesellschaft fur Elektrometallurgie Mbh
Original Assignee
ELEKTROMETALLURGIE GmbH
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Filing date
Publication date
Priority claimed from DE19671558503 external-priority patent/DE1558503A1/de
Application filed by ELEKTROMETALLURGIE GmbH filed Critical ELEKTROMETALLURGIE GmbH
Application granted granted Critical
Publication of US3565610A publication Critical patent/US3565610A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys

Definitions

  • Vanadium-containing alloying additive for steels is obtained from vanadic acid, i.e., vanadium pentoxide or vanadium pentoxide-containing compositions in a one stage process without the use of vacuum treatment by the solid-state reduction of vanadic acid with carbon under atmospheric conditions at temperatures of from 1200 to 1500 C., to produce a substance of the following composition:
  • the use of such an additive in a steel making process is particularly advantageous in that the additive dissolves well in the steel bath despite residual oxygen in the steel making bath.
  • the high density of the additive results in it taking up a position in the steel bath between the slag and the bath surface, thereby effecting a further improvement in solution.
  • This invention relates to a vanadium-containing substance produced in a one-stage reduction process, which is useful as an alloying agent for steel production.
  • vanadium pentoxide or ammonium vanadate is reduced to vanadium trioxide, which, with the corresponding quantity of carbon, is then reduced to vanadium carbide under reduced pressure over a long period at a temperature between 1200 and 1400 C.
  • the invention provides a process whereby a vanadiumcontaining alloying additive derived from vanadic acid, i.e., vanadium pentoxide or a composition containing a major proportion of vanadium pentoxide, which is useful as an alloying agent for steel production, can be produced in one stage and without vacuum treatment directly fromvanadic acid compounds.
  • a vanadiumcontaining alloying additive derived from vanadic acid i.e., vanadium pentoxide or a composition containing a major proportion of vanadium pentoxide, which is useful as an alloying agent for steel production
  • One such compound is vanadium pentoxide itself, which on an industrial scale is precipitated from a sodium vanadate solution, dried, calcined or melted, the product containing impurities (which may amount to up to 10% individually or together) such as alkali and ammonium induced in the precipitate stage.
  • ammonium rnetavanadate which decomposes at a temperature in excess of 100 C. with the liberation of ammonium salts of vanadium pentoxide or vanadium pentoxide associated with lower-valency oxides.
  • the invention consists of a vanadium-containing substance, useful as an alloying additive for steels, which is produced in the solid-state reduction of vanadic acid with carbon under atmospheric conditions at temperatures of 1200-1 5 00 C., having a composition:
  • carbon used in the said composition includes compounds such as carbon black, charcoal, coal, coke and electrode coke.
  • the vanadium-containing substance dissolves easily in steel baths, despite the residual oxygen content. Reaction between carbon and oxygen takes place in the steel bath, the CO containing gases thus generated causing agitation of the melt leading to improved distribution of the vanadium throughout the steel. This is particularly important due to the small proportion of vanadium used as an alloying material.
  • the alloying agent according to the invention is obtainable in the form of briquettes or pellets, or a porous sinter, which can be added directly to the steel bath.
  • a further reducing agent in the alloying agent for example silicon and/or aluminium, which may be in the form of a known ferro alloy, such as ferro silicon, ferro aluminium or ferro silicon aluminium. Carbon may also be incorporated at the same time.
  • silicon and/ or aluminium and possibly carbon must, of course, be such that they are only enough to reduce the residual oxygen and do not cause impermissible carburisation or an undesirable increase in these contents in the steel bath.
  • the alloying agent according to the invention may be introduced into the steel bath in comminuted form, in metal or combustible containers, for example tin boxes, or bags of paper or of plastics material or the like. If desired it may also be blown into the bath using known techniques.
  • Briquettes of the alloying agent may be obtained using known techniques of briquetting.
  • the briquettes thus obtained are of high density and which is greater than the density of conventional slags, so that they lie between the bath slag and the bath surface during solution which assists the act of solution.
  • the apparent density of these pellets was 0.71 kg./dm. After comminution and pressing into briquettes, the density was from 3 to 3.4 kg./dm.
  • EXAMPLE 2 Pellets of a vanadium product containing less carbon than that obtained in Example 1, was produced in the same way as Example 1, from 100 kg. of vanadic acid and 22.5 kg. of coke.
  • This product contained too much oxygen in relation to the carbon content, and an alloying agent was prepared from the said product by admixing therewith 5.3 kg. of pulverised 75% ferrosilicon and pressing into briquettes with kernel oil binder, the briquettes having a density of 3.1 kg./dm.
  • the alloying agent contained 72.8% of vanadium, 6.3% of carbon, 6.1% of silicon, 2.5% of iron, 5.6% of oxygen and 2.7% of nitrogen.
  • the briquettes prepared according to Examples 1 and 2 were added to steel baths having a temperature of 80 C. After two to three minutes the briquettes dissolved and a uniform distribution of the 0.15% of vanadium was achieved in the steel bath, corresponding to a vanadium take up of over 90%.
  • the absence of the use of expensive reduced pressure stages in preparing the alloying agents according to the invention means that the cost of preparation is reduced, and the frequent repair of reduced-pressure apparatus owing to the high temperatures used, is avoided.
  • the reaction times required for the production of the agent according to the invention are, moreover, much shorter, and the production of the alloying agent is not restricted to the use of any particular type of furnace. All that is required is that the reaction temperatures can be reached and the calcination material can be subjected to a reducing atmosphere.
  • reducing rotary tubular kilns or continuously-burning furnaces may be used.
  • a vanadium-containing alloying additive for steels obtained by the solid-state reduction of vanadic acid with carbon under atmospheric conditions at a temperature in the range 12001500 C., the said alloying additive having a composition; 7
  • Vanadium 70 to 85 Oxygen 2 to 10 Carbon 5 to 20 Nitrogen 0.5 to 4 4.
  • the said vanadium-containing alloying additive contains a reducing agent selected from the class consisting of silicon, aluminum, ferrosilicon, ferroaluminum and ferrosilicon aluminum.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US731272A 1967-05-29 1968-05-22 Vanadium-containing alloying additive for steel Expired - Lifetime US3565610A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671558503 DE1558503A1 (de) 1967-05-29 1967-05-29 Verwendung eines vanadinhaltigen Stoffes

Publications (1)

Publication Number Publication Date
US3565610A true US3565610A (en) 1971-02-23

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ID=5677374

Family Applications (1)

Application Number Title Priority Date Filing Date
US731272A Expired - Lifetime US3565610A (en) 1967-05-29 1968-05-22 Vanadium-containing alloying additive for steel

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US (1) US3565610A (enrdf_load_stackoverflow)
FR (1) FR1562736A (enrdf_load_stackoverflow)
GB (1) GB1162924A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4353744A (en) * 1981-06-30 1982-10-12 Union Carbide Corporation Process for producing a vanadium silicon alloy
US4361442A (en) * 1981-03-31 1982-11-30 Union Carbide Corporation Vanadium addition agent for iron-base alloys
US4374667A (en) * 1981-10-14 1983-02-22 Reading Alloys, Inc. Ferrovanadium carbide addition agents and process for their production
CN103215489A (zh) * 2013-04-27 2013-07-24 胡力 微合金及其制备方法
US20140037530A1 (en) * 2011-04-12 2014-02-06 Jianwei Zheng Method for preparing vanadium-nitrogen alloy
CN107314067A (zh) * 2017-07-28 2017-11-03 湖北飞龙摩擦密封材料股份有限公司 一种盘式摩擦衬片及其微合金化制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA773579B (en) * 1976-06-28 1978-05-30 Union Carbide Corp Process for lowering the sulfur content of vanadium-carbon materials used as additions to steel

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4361442A (en) * 1981-03-31 1982-11-30 Union Carbide Corporation Vanadium addition agent for iron-base alloys
US4353744A (en) * 1981-06-30 1982-10-12 Union Carbide Corporation Process for producing a vanadium silicon alloy
US4374667A (en) * 1981-10-14 1983-02-22 Reading Alloys, Inc. Ferrovanadium carbide addition agents and process for their production
US20140037530A1 (en) * 2011-04-12 2014-02-06 Jianwei Zheng Method for preparing vanadium-nitrogen alloy
US9227847B2 (en) * 2011-04-12 2016-01-05 Jianwei Zheng Method for preparing vanadium-nitrogen alloy
CN103215489A (zh) * 2013-04-27 2013-07-24 胡力 微合金及其制备方法
CN103215489B (zh) * 2013-04-27 2015-05-13 胡力 微合金及其制备方法
CN107314067A (zh) * 2017-07-28 2017-11-03 湖北飞龙摩擦密封材料股份有限公司 一种盘式摩擦衬片及其微合金化制备方法
CN107314067B (zh) * 2017-07-28 2019-08-20 湖北飞龙摩擦密封材料股份有限公司 一种盘式摩擦衬片及其微合金化制备方法

Also Published As

Publication number Publication date
GB1162924A (en) 1969-09-04
FR1562736A (enrdf_load_stackoverflow) 1969-04-04

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