EP2010851A2 - Metal making lance tip assembly - Google Patents
Metal making lance tip assemblyInfo
- Publication number
- EP2010851A2 EP2010851A2 EP07755720A EP07755720A EP2010851A2 EP 2010851 A2 EP2010851 A2 EP 2010851A2 EP 07755720 A EP07755720 A EP 07755720A EP 07755720 A EP07755720 A EP 07755720A EP 2010851 A2 EP2010851 A2 EP 2010851A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- active material
- face member
- assembly
- tip face
- vanes
- 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- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
-
- 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
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
-
- 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
- C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
- C21C5/5217—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace
-
- 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 present invention relates in general to metal making equipment and in particular to metal making lances.
- water-cooled lances are inserted into a furnace vessel to perform desired metal processing functions.
- a water-cooled lance is inserted into a steelmaking vessel
- BOF basic oxygen furnace
- electric arc furnace e.g., a basic oxygen furnace (BOF), electric arc furnace
- a typical lance may inject gaseous materials such as oxygen, hydrocarbon gas and/or inert gas at high velocity at various times to achieve desired treatment of the charged material (scrap and hot metal) and/or maintenance of the interior of the vessel.
- gaseous materials such as oxygen, hydrocarbon gas and/or inert gas
- Some lances may also inject particulate carbon and/or lime
- Water-cooled lances generally comprise an adapter portion, an elongated barrel portion connected at a first end thereof to the adapter portion and a lance tip portion connected to a second end of the barrel portion.
- the adapter portion comprises at least one inlet for receiving the gaseous and/or particulate matter to be injected into the furnace vessel, which matter will hereinafter be generally referred to as "active material.”
- the adapter portion also includes a water inlet and a water outlet for circulating pressurized cooling water throughout the lance.
- the barrel portion comprises at least three substantially concentrically arranged metal, typically steel, pipes for communicating the cooling water and/or active material (s) between the adapter portion and the lance tip portion.
- the outermost and first innermost pipes normally define an annular water return passageway for conveying coolant water from the lance tip portion to the adapter portion.
- the first and second innermost pipes normally define an annular water delivery passageway for conveying coolant water to the lance tip portion from the adapter portion.
- the interior of the second innermost pipe (and any additional pipes arranged interiorly thereof) defines at least one passageway for conveying active material from the adapter portion to the lance tip for injection into the furnace vessel.
- the lance tip portion usually comprises an assembly having one or more parts which may be secured by welding, soldering or the like to the concentric pipes of the barrel portion.
- the lance tip assembly comprises at least one nozzle in communication with the at least one active material passageway of the barrel portion for injecting or discharging the active material into the furnace vessel.
- the tip assembly further comprises passage means for connecting the water delivery and return passageways of the barrel portion to one another. So constructed, water or other coolant fluid may be continuously circulated through the lance to cool the lance, especially the lance tip assembly which is exposed to the greatest temperatures during lance operation. Indeed, if coolant water is not effectively conveyed through the lance tip portion then the assembly may become non-uniformly heated. This, in turn, may lead to so- called "hot-spots" or "burn-through” sites which often result in premature failure of the lance tip.
- a common practice by which the steelmaking lance manufacturing industry has sought to impart cooling to the lance tip assembly is to provide a generally centrally disposed protrusion or dimple at the inner surface of the tip face member of the tip assembly.
- the object of such protrusion is to direct coolant water radially outwardly through the interior space of the lance tip to cool all areas of the outer working surface face of the lance tip.
- the water-diverting protrusions have assumed an assortment of sizes and shapes and have met with varying degrees of success for their intended purposes. Examples of such protrusions may be found in U.S. Pat. Nos .
- U. S Patent No. 4,417,721 proposes an alternative means for improving coolant water flow across the inner surface of a lance tip.
- a plurality of intricately configured radial water flow passages are provided between a lower surface of a coolant water baffle member and the inner surface of the lance tip face member.
- the radial flow passages are defined by and located between flow vanes of uniform thickness.
- U.S. Patent Nos . 3,322,419 and 3,337,203 and United Kingdom Pat. No. 1,255,082 combine a centrally disposed protrusion and a plurality of radially arranged coolant flow vanes at the inner surface of the lance tip face member.
- the vanes do not extend either (1) essentially the entire axial distance or height between the inner surface of the lance tip face member and the lower surface of a coolant flow baffle member or (2) essentially the entire radial distance from the central protrusion to the annular coolant fluid return passageway.
- the considerable radial or axial coolant flow gaps in these designs permit cross flow between adjacent coolant flow passages at the inner surface of the lance tip face member. It is believed that such cross flow produces eddy currents and dead spaces in coolant water flow which could result in the formation of hot spots at the outer working surface of the lance tip face member.
- the present invention provides a lance tip assembly for a water-cooled lance.
- the assembly includes a tip face member having a plurality of outlets, a plurality of nozzles corresponding in number and in communication with the tip face member outlets and with a corresponding number of inlets provided in an active material well member, a coolant baffle member for directing coolant flow around the nozzles, and a tip face member support post connecting the tip face member and the active material well member for providing structural support to the tip face member during lance operation.
- the lance tip assembly of the present invention further includes both a generally centrally disposed coolant fluid diverting protrusion and a plurality of radial vanes at the inner surface of the tip face member, which vanes extend essentially the entire axial distance between the inner surface of the lance tip face member and the lower surface of the coolant fluid flow baffle member and essentially the entire radial distance from the central protrusion to the annular coolant fluid return passageway.
- the resultant construction provides high velocity and essentially eddy and void free coolant fluid flow across the inner surface of the lance tip face member which, in turn, uniformly cools the lance tip face member and greatly enhances the service life of the lance tip assembly.
- FIG. 1 is an elevational cross-section view of a lance tip assembly according to the present invention taken along line I-I of FIG. 2;
- FIG. 2 is a view the working face of the lance tip assembly of FIG. 1;
- FIG. 3 is an elevational cross-section view of the lance tip assembly shown attached to the lower end of the barrel portion of a metal making lance;
- FIG. 4 is a plan view of the inner surface of the tip face member of the lance tip assembly
- FIG. 5 is an elevational cross-section view of the tip face member taken along line V-V of FIG. 4;
- FIG. 6 is an elevational cross-section view of the tip face member taken along line VI-VI of FIG. 5 and illustrating a preferred cooling reinforcement ratio for coolant vanes constructed according to the present invention.
- FIG. 7 is an elevational cross-section view of a central portion of the tip face member according to the present invention illustrating a preferred dimple profile ratio for a central recess provided therein.
- FIGS. 1-3 collectively, a metal making lance tip assembly according to the present invention which is identified generally by reference numeral 10.
- Assembly 10 preferably comprises: a tip face member 12 having a plurality of outlets 14, a plurality of outwardly divergent nozzles 16 corresponding in number and in communication with the tip face member outlets 14 and with a corresponding number of inlets 18 provided in an active material well member 20, a coolant baffle member 22 for directing coolant flow around the nozzles 16, and a tip face member support post 24 connecting the tip face member 12 and the active material well member 20 for providing structural support to the tip face member during lance operation.
- FIG. 10 preferably comprises: a tip face member 12 having a plurality of outlets 14, a plurality of outwardly divergent nozzles 16 corresponding in number and in communication with the tip face member outlets 14 and with a corresponding number of inlets 18 provided in an active material well member 20, a coolant baffle member 22 for directing coolant flow around the nozzles 16, and a tip face member support post 24
- nozzles 16 permit gaseous and/or particulate active material to pass from an active material flow space, described below, through corresponding outlets 14 and into a unillustrated furnace vessel such as, for example, a steelmaking vessel .
- lance tip assembly 10 An exemplary, although not limitative, procedure for assembling lance tip assembly 10 is as follows.
- the various components of assembly 10 may be formed of metal or metal alloys including, without limitation, copper, brass, steel, stainless steel and the like, as may be appropriate for the intended function (s) or desired characteristic (s) of the components (e.g., structural strength, thermal conductivity, etc.) .
- One end of support post 24 is welded to the uppermost portion of a centrally located protrusion 28 provided on inner surface 30 of tip face member 12. Protrusion 28 is described in detail in connection with the discussion of FIG. 5.
- Tip face member is desirably made of highly thermally conductive metal such as, for example, solid cast or forged copper or brass.
- the tip face member 12 and nozzles 16 are cleaned and prepared for brazing, including cutting and inserting unillustrated brazing rings into the lower ends of the nozzles .
- the coolant fluid baffle member 22 is then placed into mating recesses, described hereinafter, provided on radially extending coolant flow directing vanes 32 that extend upwardly from the inner surface 30 of tip face member 12.
- Nozzles 16 are then inserted into corresponding openings in coolant baffle member 22 in alignment with tip face member outlets 14.
- the active material well member 20 is placed atop the upper ends of nozzles such that its inlets 18 are in alignment with the upper ends of nozzles 16.
- the assembly is then clamped together, the lower ends of the nozzles are brazed to upper ends of the outlets of the tip face member, the coolant fluid baffle member is welded to the nozzles, the upper ends of the nozzles are welded the inlets of the active material well member, and the upper end of the support post is welded to the active material well member.
- nozzles 16, active material well member 20 and baffle member 22 may be a single component.
- they may be formed as a unitary casting of copper or brass in a manner similar to that described in U. S. Patent No. 6,217,824, the disclosure of which is incorporated herein by reference thereto. It will be appreciated that by forming nozzles 16, active material well member 20 and baffle member 22 as a single component, several of the above-described assembly steps may be eliminated.
- FIG. 3 illustrates how tip assembly 10 is secured to a the lower end of the barrel portion of a water cooled metal making lance.
- a water cooled metal making lance includes a plurality of concentrically arranged metal, e.g., steel, pipes.
- the lance barrel has a central pipe 34 welded or otherwise suitably affixed to the active material well member 20.
- Central pipe 34 defines a central passageway 36 for delivering pressurized active material to nozzles 16.
- An annular space formed between pipe 34 and a second pipe 37 defines a coolant fluid inlet passageway 38 which is connected to an unillustrated supply of cooling water and delivers water to the lance tip assembly.
- coolant fluid baffle member 22 includes at least one internally formed bypass passageway 40 desirably corresponding in number and disposition to nozzles 16 to enable cooling of the radially outermost areas thereof.
- coolant water continuously flows through coolant fluid delivery passageway 38 into passage means defined by lower surface of the active material well member 20, the coolant fluid baffle member 22 and the inner surface 30 of the tip face member 12 and then into a coolant fluid return passageway 42.
- coolant water flows downwardly through passageway 38 into a first coolant fluid flow space defined by lower surface of the active material well member 20 and the coolant fluid baffle member 22 and bypass passageway (s) 40 (if present), around the exterior surfaces of nozzles 16, and through a central opening 44 in coolant fluid baffle member 22.
- first coolant fluid flow space defined by lower surface of the active material well member 20 and the coolant fluid baffle member 22 and bypass passageway (s) 40 (if present)
- s bypass passageway
- the coolant water While in the second coolant fluid flow space, the coolant water flows radially outwardly and around the exterior surfaces of the tip face member outlets 14 and between a plurality of radially arranged vanes 32, described below.
- the coolant water Upon exiting the second coolant fluid flow space, the coolant water combines with the coolant water exiting bypass passageway (s) 40, if present, and enters a coolant fluid return passageway 42 formed between second pipe 37 and third, and outermost pipe 46 whereupon the water is returned from the lance tip to the coolant water supply and is again recirculated through the lance.
- Coolant water flow volumes may be expected to range from about 100 to about 2000 gallons per minute (gpm) through a typical water cooled lance, although greater and lesser flows may be accommodated by the present invention as may be desired or necessary.
- protrusion 28 is preferably located coaxially with the central longitudinal axis 26 of the lance tip assembly.
- the contour of the protrusion 28 is preferably substantially conical, although it may have a somewhat convex or concave profile in relation to the central longitudinal axis 26.
- the profile of protrusion 28 is substantially conical whereby the circumferential wall of the protrusion diverges from the central longitudinal axis 26 at an angle ⁇ (FIG. 5) of between about 20° -50°, more preferably about 35°.
- ⁇ FIG. 5
- the outside or working face of tip face member 12 is preferably formed, either during or after manufacture, with a recess 48 (FIGS.
- Recess 48 is desirable in that it substantially equalizes the working face thickness of the tip face member 12 in the region of protrusion 28 which promotes substantially uniform thermal characteristics therethrough. Moreover, as discussed below in connection with FIG. 7, the contour of recess 48 may be optimized to achieve a preferred "dimple profile ratio.”
- FIGS. 4 and 5 reveal a presently preferred configuration of coolant flow directing vanes 32.
- vanes 32 extend essentially the entire axial distance or height between the inner surface 30 of the lance tip face member 12 and the lower surface of the coolant flow baffle member 22, and essentially the entire radial distance from the central protrusion 28 to the annular coolant fluid return passageway 42.
- a first set of vanes, identified by reference numeral 32a, intersect and are in contact with outlets 14 and nozzles 16, whereby vanes 32a provide structural support to the outlets and nozzles which serves to minimize distortion of the tip face member 12 during lance operation.
- vanes 32a function as reinforcing ribs that minimize nozzle distortion.
- a second set of vanes, identified by reference numeral 32b, are preferably circumferentially spaced midway between adjacent vanes 32a. As best seen in FIG.
- each of vanes 32b are preferably formed, such as by machining, or the like, with a depression 50 having a contour which is adapted receive the lower surface of the coolant flow baffle member 22.
- a preferred, although non-limitative, shape of depression is a generally lobe-shaped concavity. It is preferred that the lower surface of the coolant flow baffle member also be formed or machined to produce a shape that essentially mates with depression 50. In this way, coolant cross-flow between vanes is effectively prevented whereby coolant flow control is optimized during lance operation.
- vanes 32a and 32b radiating from protrusion 28 establishes highly controlled coolant water flow paths that enhance the ability of the lance tip assembly to convey water at high velocity and more uniformly cool the lance tip. Additionally, the vanes provide structural reinforcement for the lance tip face and nozzles, thereby resulting in enhanced lance tip performance and service life.
- FIG. 6 shows a presently preferred elevational cross- section configuration of vanes 32.
- each vane has a height "H” and an average thickness "T" (measured at approximately H/2) at any point along the radial extent of the vane.
- H is the axial distance between the inner surface 30 of the lance tip face member 12 and the lower surface of the coolant flow baffle member 22.
- the inner surface 30 the tip face member 12 is preferably defined by a convex, preferably frustoconical shape, the height "H" of the vanes varies from protrusion 28 throughout the radial extent of the vanes.
- vanes 32 have thicknesses which vary as a function of radial distance from protrusion 28 to the perimeter of the lance tip face member. This thickness is represented by the variable "T” in FIG. 6 and be can observed most clearly in FIG. 4. It will be understood, however, that the working face of the lance tip face member 12 may be essentially flat, in which case the height "H” and thickness "T” of vanes 32 would be essentially constant throughout the radial extent of the vanes beyond central protrusion 28.
- a "coolant reinforcement ratio" or W CRR" with respect to the vanes is defined as T/H.
- a CRR of approximately 0.3 contributes to the superior cooling characteristics of the lance tip assembly . according to the present invention versus conventional lance tip assemblies known in the art.
- FIG. 7 there is shown a limited cross- section of the central region of lance tip face member 12. That figure illustrates the flow path of coolant water as it passes through coolant flow baffle member 22 and becomes radially outwardly deflected by internal protrusion 28. Also shown in FIG. 7 are certain dimensional variables defining the general size and shape of recess 48 formed at the working face of the tip. As depicted in FIG. I 1 dimension "D" is the diameter of a circle defined by the foremost projection of the working face of the lance tip circumscribing recess 48.
- D is the depth of recess 48 from the foremost projection of the outer surface or working face of the lance tip to the deepest point of the recess as measured along the central longitudinal axis 26 of assembly 10.
- DPR depth of DPR
- a known failure mechanism in a typical BOF lance tip is center face wear caused by slag and/or metal entrained in the furnace gasses .
- a recess 48 of appropriate depth "d" in relation to dimension "D" may substantially reduce the exposed area of the tip working face which reduces face wear.
- a relatively flat tip face would have a high DPR ratio.
- the final recess profile is dependent on a compromise between the requirements of the internal water distribution profile, nozzle leg spacing and face thickness.
- a beneficial DPR contributes to the superior cooling characteristics of the lance tip assembly according to the present invention versus conventionally constructed lance tip assemblies known in the prior art (as observed by the inventors through empirical comparative experimentation) .
- the illustrated lance assembly is constructed with a single centrally located active material delivery conduit, it is possible that the lance may contain more than one such passageway for delivering similar or dissimilar active materials. Likewise, it is also possible that the coolant water inlet passageway may disposed interiorly rather than exteriorly of one or more of the active material passageway (s) .
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Charging Or Discharging (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US79425806P | 2006-04-21 | 2006-04-21 | |
PCT/US2007/009551 WO2007123986A2 (en) | 2006-04-21 | 2007-04-19 | Metal making lance tip assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2010851A2 true EP2010851A2 (en) | 2009-01-07 |
EP2010851A4 EP2010851A4 (en) | 2009-08-26 |
Family
ID=38625584
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07755720A Withdrawn EP2010851A4 (en) | 2006-04-21 | 2007-04-19 | Metal making lance tip assembly |
Country Status (5)
Country | Link |
---|---|
US (1) | US20070246869A1 (en) |
EP (1) | EP2010851A4 (en) |
CA (1) | CA2657393A1 (en) |
MX (1) | MX341804B (en) |
WO (1) | WO2007123986A2 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9222144B2 (en) * | 2008-12-11 | 2015-12-29 | Technological Resources Pty. Limited | Injecting gas into a vessel |
US8616104B2 (en) | 2010-07-12 | 2013-12-31 | Robert Bosch Gmbh | Portable table saw |
WO2014189506A1 (en) | 2013-05-22 | 2014-11-27 | Johns Manville | Submerged combustion burners and melters, and methods of use |
WO2014189504A1 (en) | 2013-05-22 | 2014-11-27 | Johns Manville | Submerged combustion burners |
US9777922B2 (en) | 2013-05-22 | 2017-10-03 | Johns Mansville | Submerged combustion burners and melters, and methods of use |
WO2014189501A1 (en) | 2013-05-22 | 2014-11-27 | Johns Manville | Submerged combustion burners, melters, and methods of use |
EP2999923B1 (en) | 2013-05-22 | 2018-08-15 | Johns Manville | Submerged combustion melter with improved burner and corresponding method |
WO2014193388A1 (en) | 2013-05-30 | 2014-12-04 | Johns Manville | Submerged combustion glass melting systems and methods of use |
SI3003997T1 (en) | 2013-05-30 | 2021-08-31 | Johns Manville | Submerged combustion burners with mixing improving means for glass melters, and use |
WO2015009300A1 (en) | 2013-07-18 | 2015-01-22 | Johns Manville | Fluid cooled combustion burner and method of making said burner |
US9751792B2 (en) | 2015-08-12 | 2017-09-05 | Johns Manville | Post-manufacturing processes for submerged combustion burner |
BE1023609B1 (en) | 2016-04-15 | 2017-05-16 | Soudobeam Sa | Blowing spear nose |
US10337732B2 (en) | 2016-08-25 | 2019-07-02 | Johns Manville | Consumable tip burners, submerged combustion melters including same, and methods |
AU2023225620A1 (en) * | 2022-02-25 | 2024-09-12 | Sierra Energy | Lances for injecting reactants into gasifiers |
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GB1255082A (en) * | 1969-10-02 | 1971-11-24 | Ilseder Huette | Head for refining lances |
US4052005A (en) * | 1976-03-11 | 1977-10-04 | Berry Metal Company | Oxygen lance nozzle |
US4951928A (en) * | 1988-04-25 | 1990-08-28 | Voest-Alpine Industrienlagenbau Gesellschaft M.B.H. | Blowing lance arrangement |
DE29907794U1 (en) * | 1999-05-03 | 1999-07-22 | Impact Gesellschaft für Nichteisenmetallverarbeitung mbH, 47445 Moers | Lance head for a water-cooled oxygen lance |
US20030178186A1 (en) * | 2000-09-15 | 2003-09-25 | Jacques Thomas | Blowing lance nozzle |
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US28769A (en) * | 1860-06-19 | Improvement in clarifying sugar | ||
US3322419A (en) * | 1964-12-24 | 1967-05-30 | Union Carbide Corp | Oxygen jet devices |
US3337203A (en) * | 1964-12-24 | 1967-08-22 | Union Carbide Corp | Oxygen lances |
US3224749A (en) * | 1965-03-01 | 1965-12-21 | Berry Metal Co | Oxygen injection lance |
US3525508A (en) * | 1967-03-20 | 1970-08-25 | Berry Metal Co | Injection lance with an immersible nozzle |
US3525509A (en) * | 1967-04-07 | 1970-08-25 | Berry Metal Co | Injection lance with a nozzle adapted for above the bath operation |
US3559974A (en) * | 1969-03-03 | 1971-02-02 | Berry Metal Co | Oxygen lances having a high resistance to deterioration and multipiece nozzle heads therefor |
US3615374A (en) * | 1969-11-18 | 1971-10-26 | Berry Metal Co | Alloyed copper |
US3726673A (en) * | 1969-11-18 | 1973-04-10 | Berry Metal Co | Method of making alloyed copper |
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US4417721A (en) * | 1982-06-04 | 1983-11-29 | Pehlke Robert D | Lance tip for oxygen steelmaking |
DE3509795C1 (en) * | 1985-03-19 | 1986-06-05 | Klöckner CRA Technologie GmbH, 4100 Duisburg | Water-cooled blowing lance for blowing oxygen onto a molten metal |
BE1009743A3 (en) * | 1995-06-23 | 1997-07-01 | Thomas Jacques | Tuyere blowing oxygen steel. |
US6217824B1 (en) * | 1999-05-20 | 2001-04-17 | Berry Metal Company | Combined forged and cast lance tip assembly |
-
2007
- 2007-04-19 CA CA002657393A patent/CA2657393A1/en not_active Abandoned
- 2007-04-19 MX MXMX08013184A patent/MX341804B/en active IP Right Grant
- 2007-04-19 WO PCT/US2007/009551 patent/WO2007123986A2/en active Application Filing
- 2007-04-19 EP EP07755720A patent/EP2010851A4/en not_active Withdrawn
- 2007-04-19 US US11/788,251 patent/US20070246869A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1255082A (en) * | 1969-10-02 | 1971-11-24 | Ilseder Huette | Head for refining lances |
US4052005A (en) * | 1976-03-11 | 1977-10-04 | Berry Metal Company | Oxygen lance nozzle |
US4951928A (en) * | 1988-04-25 | 1990-08-28 | Voest-Alpine Industrienlagenbau Gesellschaft M.B.H. | Blowing lance arrangement |
DE29907794U1 (en) * | 1999-05-03 | 1999-07-22 | Impact Gesellschaft für Nichteisenmetallverarbeitung mbH, 47445 Moers | Lance head for a water-cooled oxygen lance |
US20030178186A1 (en) * | 2000-09-15 | 2003-09-25 | Jacques Thomas | Blowing lance nozzle |
Non-Patent Citations (1)
Title |
---|
See also references of WO2007123986A2 * |
Also Published As
Publication number | Publication date |
---|---|
MX341804B (en) | 2016-09-05 |
MX2008013184A (en) | 2008-10-27 |
US20070246869A1 (en) | 2007-10-25 |
CA2657393A1 (en) | 2007-11-01 |
WO2007123986A2 (en) | 2007-11-01 |
EP2010851A4 (en) | 2009-08-26 |
WO2007123986A3 (en) | 2007-12-21 |
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