US3354002A - Thermochemical scarfing method - Google Patents

Thermochemical scarfing method Download PDF

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Publication number
US3354002A
US3354002A US533277A US53327766A US3354002A US 3354002 A US3354002 A US 3354002A US 533277 A US533277 A US 533277A US 53327766 A US53327766 A US 53327766A US 3354002 A US3354002 A US 3354002A
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US
United States
Prior art keywords
stream
slag
reaction zone
main
fluid stream
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
US533277A
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English (en)
Inventor
Cecil R Gingerich
Rudolph F Hinschlager
Allan R Wandelt
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Union Carbide Corp
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Union Carbide Corp
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 Union Carbide Corp filed Critical Union Carbide Corp
Priority to US533277A priority Critical patent/US3354002A/en
Priority to BR187686/67A priority patent/BR6787686D0/pt
Priority to BE695252D priority patent/BE695252A/xx
Priority to GB01112/67A priority patent/GB1181393A/en
Priority to AT231667A priority patent/AT264024B/de
Priority to FR98406A priority patent/FR1515381A/fr
Priority to DE1621669A priority patent/DE1621669C3/de
Application granted granted Critical
Publication of US3354002A publication Critical patent/US3354002A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K7/00—Cutting, scarfing, or desurfacing by applying flames
    • B23K7/06—Machines, apparatus, or equipment specially designed for scarfing or desurfacing
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents

Definitions

  • This invention relates to therrnochernical scarfing the surface of a metal body and particularly to improvements to the basic method of granulating, trapping and rernoving the molten slag produced during such process, by the utilization of a fluid stream, e.g. Water, which is discharged to skim across the surface at high velocity.
  • a fluid stream e.g. Water
  • the basic method is disclosed by I. P. Thompson et a1. in U.S. Patent 2465297.
  • thermochernical scarfing process a stream of oxidizing gas is directed obliquely against a reaction zone of molten metal which has been previously formed upon the surface of the body. In so doing, a thermochemical reaction is produced, which continues along the surface of the body as relative movement is produced between such body and the stream of oxidizing gas. As a result of this thermochernical scarfing reaction, a molten slag is produced which must be removed from the surface of the body. This is acomplished according to the basic reference by directing a stream of fluid, e.g. water, at high velocity so as to skim across the surface of the body and thereby impinge against and completely deflect the slag oft the surface thereof. The fluid stream also breaks the slag into small particles, chills it and directs the particles ofi" the surface into a slag chute.
  • a stream of fluid e.g. water
  • the object of the invention is to provide an improved method of trapping and rernoving slag produced during a scarfing rea-ction, such that substantially all of the slag produced will be removed, with little if any being deflected against the surfaces of the scarfing machine, slag target, roll table and smoke hood, etc.
  • At least one main fluid stream is discharged at high velocity and positioned so as to skim across the surface of the body in front of the reaction zone.
  • the purpose of the main stream is to trap most of the slag and to wash it 0if the surface being scarfed, into a slag chute.
  • At least one additional fluid stream is then directed across the surface of the body in front of the reaction zone, frorn a osition further above the surface than the main stream.
  • two or more additional streams are utilized. They are prefera-bly positioned so as to partially surround the main stream.
  • the volume fiow rateof each additional stream may be substantially lass than that of the main strearn.
  • This embodiment is particularly Well suited for the scarfing of wide metal bodies, i.e. slabs, where a relatively massive main stream is needed to traverse the entire surface thereof with sufiicient force to trap and push the slag laterally 011 the surface into the slag chute.
  • the smaller auxiliary streams act mainly to trap the fine slag spray which is not trapped by the main stream.
  • a generally channel-shaped stream of fluid is directed across the surface of the body in front of the reaction zone, With the opening in the channel substantially facing the reaction zone.
  • a fluid stream of this general configuration will act as a pocket to trap the slag and carry it laterally 011 the surface of the metal body.
  • the channel-shaped strearn may be formed from a single nozzle of appropriate shape or alternatively, it may be fiormed from a plurality of spaced individual streams arranged so as to form this pattern.
  • a particularly efiective channel-shaped fluid stream has been formed frorn a plurality of individual streams arranged in a crescent type pattern, With the opening in the crescent facing the reaction zone.
  • FIGURE 1 is an end view facing the reaction zone, of a metal body heing scarfed, and illustrating the slag removal method of the invention
  • FIGURE 2 is a side view of the body to be scarfed and facing the fluid nozzles shown in FIGURE 1 and
  • FIGURE 3 is a side view similar to FIGURE 2 but illustrating another embodirnent of the invention.
  • the metal body W to be scarfed is supported upon and moved by roll table R toward a scarfing unit M.
  • a molten puddle of metal is formed upon the surface of the body at reaction zone Z, by preheat flames from the scarfing unit M.
  • a sheet-like stream of oxidizing gas S e.g. oxygen
  • Relative movement is then produced between the metal body W and the oxidizing gas stream S so as to continue the reaction along the surface length of the body.
  • a substantial portion cf the molten slag comes into contact with a high velocity main stream 10 of fluid, e.g. water.
  • the fluid stream is discharged from a nozzle 12 which is positioned so that the fluid Will skim across the surface of the metal body at a point slightly downstream of the reaction zone.
  • the fluid strearn is discharged into a slag chute 14 adjacent the opposite side of the metal body.
  • a significant portion cf the molten slag is broken up and deflected by the main strearn 10 and carried into the slag chute 14.
  • the additional strearns are positioned with their central axis above the central axis of the main stream 10, and preferably such additional strearns partially surroundthe main stream as illustrated in FIGURE 2.
  • at least one of the additional streams 16 is oflset from the main strearn 10 toward the reaction zone.
  • the top surface of a 95 inch wide metal body was scarfed with a flow rate of 325,000 c.f.h. of oxygen at a scarfing speed of the order of: 120 fest per minute.
  • a rnain stream of water having a diametcr of approximately 2 inches and a flow rate of 310 gallons per minute was skimmed across the surface of the body.
  • Three additional streams of water, positioned as shown in FIGS. 1 and 2 were used to trap and rernove the slag deflccted away from the slag chute by the main stream.
  • Bach of the additional streems had a diameter of approxirnately 1% inches, and each was discharged at a flow rate of about 200 gallons per minute.
  • the prirnary purpose of the additional streams is t0 act as a fluid shield for the main stream.
  • t0 act as a fluid shield for the main stream.
  • FIGURE 3 another ernbodiment of the invention is illustrated which is particularly efiective in trapping slag during the scarfing of metal bodies having relatively narrow surface widths, i.e. billets and blooms.
  • a fluid pocket is f1rned by direct'ing the fluid, e.g. water, in a channel shaped stream ac'ross the surface of the metal body at a point adjacent the reaction zone.
  • T he channel-shaped strearn is formed so that the opening in the channel substantially faces the reaction zone.
  • This type of patterned water stream acts as a pocket to trap the slag and carry it oif into the slag chute.
  • FIGURE 3 illustrates a crescent shaped channel pattern, having its opening facing the reaction zone. It should be understood, however, that numerous other channel-shaped configurations r'nay also be used, according to this invention.
  • the channel shaped stream may be formed frorn a plurality of individual streams arranged in a channel-shaped pattern as illustrated for example in FIGURE 3, or alternatively it may be formed into a continuous strearn by an appropriately shaped nozzle, in either case the objeet being to for-rn a type of fluid pocket so as to trap the slag and carry it laterally ofl the metal body.
  • the top surface of a 10 inch wide metal billet was scarfed with aflow rate of 000 c.f.h. of oxygen at a scarfing speed of the -order of 120 feet per minute. Twelve individual strearns of water having a diameter of about inch each and a total flow rate of about 250 gallons per minute were arranged in a crescent facing the reaction zone (see FIGURE 3). The ability of this method of slag removal was excellent, it being far superior to the methods heretof-ore used in the art.
  • thermochernical scarfing process wherein a stre'am of oxidizing gas is directed against a reaction zone of molten metal on the surface of a metal body to produce a thermochemical reaetion thereon, and relative movement between such strearn and the body is produced for continuing such reaction along the length of such surface, the improvernent for granulating and trapping molten sla-g produced during such reaction which comprises:
  • each additional fluid stream is of smaller volume flow rate than said main fluid strearn.
  • thermochemical scarfing process as claimed in clairn 1 wherein said additional streams at least partially surround said rnain stream.
  • thermochemical scarfing process wherein a stream of oxidizing gas is directed against a reaction zone of molten metal on the snrface of a metal body to produce a therrnochernical reaction thereon, and relative movernent between such stream and the body is produced for continuing such reaction along the length of such surface
  • the improvement for granulating and trapping molten slag produced during such reaction which comprises directing a generally channel-shaped stream of fluid transversely of said surface in front of said reaction zone, with the opening in the channel substantially facing said reaction zone, whereby said stream will act as a pocket to trap the slag and carry it laterally oft said surface.
  • thermochemical scarfing process as claimed in claim 6 wherein said channel-shaped strearn of fluid is forrned froxn a plurality of spaced individual strearns.
  • thermochemical scarfing -process as claimed in claim 6 wherein said channel-shaped stream is forrned by a plurality of individual strcams spaced apart frorn one another in a crescent formation, with the opening in the crescent facing the reaction zone.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Nozzles (AREA)
  • Gasification And Melting Of Waste (AREA)
US533277A 1966-03-10 1966-03-10 Thermochemical scarfing method Expired - Lifetime US3354002A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US533277A US3354002A (en) 1966-03-10 1966-03-10 Thermochemical scarfing method
BR187686/67A BR6787686D0 (pt) 1966-03-10 1967-03-09 Processo de escarfagem termoquimica
BE695252D BE695252A (en:Method) 1966-03-10 1967-03-09
GB01112/67A GB1181393A (en) 1966-03-10 1967-03-09 Thermochemical Scarfing Process
AT231667A AT264024B (de) 1966-03-10 1967-03-10 Thermochemisches Flämmverfahren
FR98406A FR1515381A (fr) 1966-03-10 1967-03-10 Procédé d'écroûtage thermo-chimique de la surface d'un corps métallique
DE1621669A DE1621669C3 (de) 1966-03-10 1967-03-10 Vorrichtung zum Flämmen einer metallischen Werkstückoberfläche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US533277A US3354002A (en) 1966-03-10 1966-03-10 Thermochemical scarfing method

Publications (1)

Publication Number Publication Date
US3354002A true US3354002A (en) 1967-11-21

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US533277A Expired - Lifetime US3354002A (en) 1966-03-10 1966-03-10 Thermochemical scarfing method

Country Status (7)

Country Link
US (1) US3354002A (en:Method)
AT (1) AT264024B (en:Method)
BE (1) BE695252A (en:Method)
BR (1) BR6787686D0 (en:Method)
DE (1) DE1621669C3 (en:Method)
FR (1) FR1515381A (en:Method)
GB (1) GB1181393A (en:Method)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3870571A (en) * 1973-01-31 1975-03-11 Mannesmann Ag Method for surface treatment of intermediate products which are being flame scarfed
US3890167A (en) * 1973-09-07 1975-06-17 Kobe Steel Ltd Method and apparatus for producing a casting having a satisfactory surface with a continuous casting operation
US4120703A (en) * 1975-08-29 1978-10-17 Union Carbide Corporation Method and apparatus for reducing smoke and preventing secondary fins during scarfing
FR2400985A1 (fr) * 1977-08-26 1979-03-23 Union Carbide Corp Procede et appareil d'ecriquage thermochimique
US4345744A (en) * 1980-05-11 1982-08-24 Trumpf Gmbh & Co. Working machine with flame cutter and cooling unit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106799531A (zh) * 2017-03-15 2017-06-06 安徽理工大学 一种水射流辅助氧乙炔切割钢板的装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465297A (en) * 1943-12-30 1949-03-22 Linde Air Prod Co Process and apparatus for disposing of metal desurfacing products
US3163559A (en) * 1957-11-12 1964-12-29 Union Carbide Corp Water jet method of deslagging a metal surface

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465297A (en) * 1943-12-30 1949-03-22 Linde Air Prod Co Process and apparatus for disposing of metal desurfacing products
US3163559A (en) * 1957-11-12 1964-12-29 Union Carbide Corp Water jet method of deslagging a metal surface

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3870571A (en) * 1973-01-31 1975-03-11 Mannesmann Ag Method for surface treatment of intermediate products which are being flame scarfed
US3890167A (en) * 1973-09-07 1975-06-17 Kobe Steel Ltd Method and apparatus for producing a casting having a satisfactory surface with a continuous casting operation
US4120703A (en) * 1975-08-29 1978-10-17 Union Carbide Corporation Method and apparatus for reducing smoke and preventing secondary fins during scarfing
FR2400985A1 (fr) * 1977-08-26 1979-03-23 Union Carbide Corp Procede et appareil d'ecriquage thermochimique
US4345744A (en) * 1980-05-11 1982-08-24 Trumpf Gmbh & Co. Working machine with flame cutter and cooling unit

Also Published As

Publication number Publication date
BR6787686D0 (pt) 1973-12-26
FR1515381A (fr) 1968-03-01
DE1621669A1 (de) 1971-06-03
AT264024B (de) 1968-08-12
DE1621669B2 (de) 1975-01-09
GB1181393A (en) 1970-02-18
BE695252A (en:Method) 1967-09-11
DE1621669C3 (de) 1980-08-14

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