US3315323A - Method of continuous casting - Google Patents

Method of continuous casting Download PDF

Info

Publication number
US3315323A
US3315323A US313249A US31324963A US3315323A US 3315323 A US3315323 A US 3315323A US 313249 A US313249 A US 313249A US 31324963 A US31324963 A US 31324963A US 3315323 A US3315323 A US 3315323A
Authority
US
United States
Prior art keywords
slag
casting
covering
mould
powdery
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
US313249A
Other languages
English (en)
Inventor
Speith Karl Georg
Bungeroth Adolf
Frenken Klaus
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Application granted granted Critical
Publication of US3315323A publication Critical patent/US3315323A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal

Definitions

  • the invention relates to a method for continuous casting.
  • metals with high melting points are understood to be steel, iron and so-called base nonferrous metals and their alloys.
  • the object of the invention is toobtain satisfactory billets, with perfect surfaces in particular, when casting any grade of metal by continuous casting, the amount of slag on the bath surface being as small as possible.
  • a powdery covering material is applied to the bath surface in an amount sufficient to cover this surface completely, and that at least part of this material should remain powdery while the rest may melt so that after a few minutes of the temperatures prevailing in the top of the billet a fluid slag layer is formed whose surface tension is such that the mould wall is not wetted.
  • the quantity of covering powder may be such that only part of it melts while the rest stays on top of it in a solid, powdery state, reducing the heat radiation of the slag and preventing the slag from forming a coating.
  • the quantity applied may then be 3 to 10 grams per :square centimeter of the billet surface area, and preferably 3 to 6 grams per square centimeter, the larger quan- I tities being associated with the longer casting times. Results so far obtained indicate that in steel casting a maximum of .7 kg. and an average of .4 to .6 kg. of covering powder is needed per tonne of steel. If because of a very unstable pouring jet the slag surface is covered with steel spatters or if because of unexpectedly long casting times the covering material melts the slag may be skimmed off and the covering material applied again.
  • the casting surface in continuous casting moulds can be covered with loosely poured, that is, drippable, powdery materials which, partly melting and forming slag, make a slag layer which is thin compared with the powdery layer above it and is tough enough not to touch the mould wall.
  • These covering powders for use in extrusion have a relatively high melting point, preferably above 1400 C., in case of partial melting a high viscosity, preferably above 100 poises, and a relatively high surface tension. They are used in layers of moderate thickness, with the mould lubrication turned ofl, up to about 50 mm. on the casting surface in a moved sliding mould. If the covering powder melts where it touches the casting surface, it is essential that the tough slag layer in permanent contact with the powder above and gradually forming from this should be only moderately thick (up to about 25 mm.).
  • Other compositions of the covering material are possible if they only form a suitable viscous slag at the casting temperatures concerned, part of the quantity applied remaining in a powdery state.
  • Another covering powder has the following composition:
  • the method according to the invention is particularly suitable for casting steels containing aluminum. Contrary to all expectations, it was found that these steels, despite the high A1 content of the slag, had a much lower content of aluunina inclusions than steels cast in the usual way. The surface of the billet, moreover, was always in very good condition, although steels containing aluminum are notorious for involving special casting problems as regards the surface condition.
  • the powdery covering material is preferably fed to the bath surface by means of a neutral gas through a ring conduit with nozzles on the upper edge of the mould.
  • the number of nozzles depends on the size of the billet.
  • Other known mechanical feeding means may, of course, be used instead.
  • a ceramic pipe for example of zircon silicate, with a suitable diameter may be fixed to the mould or the feed pipe for the covering powder so as to project into the top of the billet.
  • FIG. 1 shows a continuous casting mould
  • FIG. 2 shows another embodiment of a continuous casting mould, with the feed device for the covering material omitted.
  • a continuous casting mould 1 (FIG. 1) contains a continuous billet 2 which has solidified at the edges. Above this there is a conventional distributing vessel 3, from which the fluid steel drops in a free fall to the bath surface through a spout 4. Above the mould 1 there is a ring conduit 6 with nozzles 5 through which the covering mixture which is to be applied to the bath surface is sent by means of a neutral gas. The crosssection of the ring conduit 6 and the number of nozzles 5 depend on the quantity to be supplied and the crosssection of the billet. Part of the powdery covering material applied to the bath surfare there forms a tough slag 7, while the rest stays above this in a powdery state 8.
  • the embodiment shown in 'FIG. 2 also has the fluid part 7 and powdery part 8 of the covering material on the bath surface.
  • a ceramic pipe 9 is suspended in the mould 1. The lower end of this reaches into the top of the billet, and its diameter is such that it does not interfere with the free fall of the pouring jet.
  • the method as a whole has a number of quite considerable advantages over the state of the art.
  • no special melting devices are needed for the slag. Feeding is completely safe and much easier to carry out.
  • the smallness of the amount that has to be added is a considerable saving.
  • As the method can be used without any mould lubrication there are advantages over conventional lubrication on the grounds of this saving alone, and with slag lubrication the cost of subsequent removal of the slag layer from the casting surface is saved. Above all, however, there is the certainty of good surfaces at all times, for no change in the consistency of the slag is caused by non-metallic inclusions coming up out of the steel.
  • a powdery covering material to the upper metal bath surface after the upper metal bath surface has reached a substantially predetermined height in the casting mould, at least some of said material being operative to melt, thereby forming a covering slag on a portion of said surface, where the covering slag layer is not more than 25 mm.
  • the covering slag layer does .not touch the mould wall, the gap between the covering slag layer and the mould wall is being filled with the powdery material, and the powdery layer remaining on top of the covering slag layer is at least as thick as the covering slag layer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US313249A 1962-10-04 1963-10-02 Method of continuous casting Expired - Lifetime US3315323A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM54396A DE1233106B (de) 1962-10-04 1962-10-04 Verfahren zur Erzielung einer einwandfreien Oberflaeche beim Stranggiessen

Publications (1)

Publication Number Publication Date
US3315323A true US3315323A (en) 1967-04-25

Family

ID=7308009

Family Applications (1)

Application Number Title Priority Date Filing Date
US313249A Expired - Lifetime US3315323A (en) 1962-10-04 1963-10-02 Method of continuous casting

Country Status (4)

Country Link
US (1) US3315323A (enrdf_load_stackoverflow)
BE (1) BE638185A (enrdf_load_stackoverflow)
DE (1) DE1233106B (enrdf_load_stackoverflow)
NL (1) NL298474A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465811A (en) * 1965-11-15 1969-09-09 Est Aciers Fins Plants for the continuous casting of steel
US3467284A (en) * 1967-05-24 1969-09-16 Bethlehem Steel Corp Distributor for continuous casting machine
US3519059A (en) * 1967-07-12 1970-07-07 Viktor Grigorievich Voskoboini Method of vacuum slag refining of metal in the course of continuous casting
US3698466A (en) * 1969-12-30 1972-10-17 Mannesmann Ag Method for continuous casting of steel
US3766961A (en) * 1969-09-04 1973-10-23 Roblin Industries Apparatus for continuously casting steel
US4020892A (en) * 1971-11-16 1977-05-03 Hoesch Aktiengesellschaft Method for continuous casting of steel

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304258A (en) * 1937-06-07 1942-12-08 Rossi Irving Method of treating metals and metal alloys during casting
US2568525A (en) * 1948-06-05 1951-09-18 Int Nickel Co Gas hood for casting machines
US2737696A (en) * 1954-01-13 1956-03-13 United States Steel Corp Method of producing sound ingots of fully killed steel in big-end-down molds
US2760859A (en) * 1952-09-10 1956-08-28 Edward H Graf Metallurgical flux compositions
US2797990A (en) * 1953-03-12 1957-07-02 Dominion Magnesium Ltd Flux for magnesium alloys containing zirconium
US2825947A (en) * 1955-10-14 1958-03-11 Norman P Goss Method of continuous casting of metal
GB835084A (en) * 1956-10-01 1960-05-18 Babcock & Wjlcox Company Method of continuously casting metals
US3034186A (en) * 1956-10-22 1962-05-15 Dow Chemical Co Lubricating method for the continuous casting of readily oxidizable metals
US3089209A (en) * 1960-01-06 1963-05-14 American Smelting Refining Method for continuous casting of metal
US3153820A (en) * 1961-10-09 1964-10-27 Charles B Criner Apparatus for improving metal structure
US3167829A (en) * 1962-02-20 1965-02-02 Concast Ag Apparatus for continuous casting of metal

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304258A (en) * 1937-06-07 1942-12-08 Rossi Irving Method of treating metals and metal alloys during casting
US2568525A (en) * 1948-06-05 1951-09-18 Int Nickel Co Gas hood for casting machines
US2760859A (en) * 1952-09-10 1956-08-28 Edward H Graf Metallurgical flux compositions
US2797990A (en) * 1953-03-12 1957-07-02 Dominion Magnesium Ltd Flux for magnesium alloys containing zirconium
US2737696A (en) * 1954-01-13 1956-03-13 United States Steel Corp Method of producing sound ingots of fully killed steel in big-end-down molds
US2825947A (en) * 1955-10-14 1958-03-11 Norman P Goss Method of continuous casting of metal
GB835084A (en) * 1956-10-01 1960-05-18 Babcock & Wjlcox Company Method of continuously casting metals
US3034186A (en) * 1956-10-22 1962-05-15 Dow Chemical Co Lubricating method for the continuous casting of readily oxidizable metals
US3089209A (en) * 1960-01-06 1963-05-14 American Smelting Refining Method for continuous casting of metal
US3153820A (en) * 1961-10-09 1964-10-27 Charles B Criner Apparatus for improving metal structure
US3167829A (en) * 1962-02-20 1965-02-02 Concast Ag Apparatus for continuous casting of metal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3465811A (en) * 1965-11-15 1969-09-09 Est Aciers Fins Plants for the continuous casting of steel
US3467284A (en) * 1967-05-24 1969-09-16 Bethlehem Steel Corp Distributor for continuous casting machine
US3519059A (en) * 1967-07-12 1970-07-07 Viktor Grigorievich Voskoboini Method of vacuum slag refining of metal in the course of continuous casting
US3766961A (en) * 1969-09-04 1973-10-23 Roblin Industries Apparatus for continuously casting steel
US3698466A (en) * 1969-12-30 1972-10-17 Mannesmann Ag Method for continuous casting of steel
US4020892A (en) * 1971-11-16 1977-05-03 Hoesch Aktiengesellschaft Method for continuous casting of steel

Also Published As

Publication number Publication date
BE638185A (enrdf_load_stackoverflow)
NL298474A (enrdf_load_stackoverflow)
DE1233106B (de) 1967-01-26

Similar Documents

Publication Publication Date Title
US2825947A (en) Method of continuous casting of metal
US3465811A (en) Plants for the continuous casting of steel
US3318363A (en) Continuous casting method with degassed glass-like blanket
US2493394A (en) Process of pouring metals and products produced thereby
CN113939376B (zh) 含Al亚包晶钢的连续铸造用保护渣和连续铸造方法
US3315323A (en) Method of continuous casting
US4435211A (en) Process of blowing high-oxygen gases into a molten bath which contains non-ferrous metals
US3845809A (en) Means for the continuous casting of steel
US3630267A (en) Method of controlling the temperature of molten ferrous metal
US3607234A (en) Steel-refining composition containing portland cement and fluorspar
JP4272577B2 (ja) 鋼の連続鋳造方法
US3333625A (en) Method of casting fusible materials
US3094424A (en) Sintered refractory material
EP0063823B1 (en) Method for continuous casting of steel
US3718173A (en) Method of removing alumina scum from a continuous-casting mold
US3677325A (en) Process of submerged nozzle continuous casting using a basalt flux
US3339588A (en) Continuous casting mold
US3136626A (en) Method of refining cast-iron
JP2985671B2 (ja) 鋼の連続鋳造用モールドパウダー
US3225399A (en) Casting process using borax-silica slag
KR950012628B1 (ko) 빌레트 연속주조용 몰드 플럭스
JP3256148B2 (ja) 凝固過程での収縮量の大きい鋼の連続鋳造方法
JPH0515955A (ja) 連続鋳造用モールドパウダー
US3866662A (en) Method of casting quiet steel in molds
JPS6353902B2 (enrdf_load_stackoverflow)