GB1579522A - Plunger lance - Google Patents

Plunger lance Download PDF

Info

Publication number
GB1579522A
GB1579522A GB4529/78A GB452978A GB1579522A GB 1579522 A GB1579522 A GB 1579522A GB 4529/78 A GB4529/78 A GB 4529/78A GB 452978 A GB452978 A GB 452978A GB 1579522 A GB1579522 A GB 1579522A
Authority
GB
United Kingdom
Prior art keywords
tube
lance
plunger
metallic
casing
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
Application number
GB4529/78A
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.)
Fried Krupp Huettenwerke AG
Original Assignee
Fried Krupp Huettenwerke 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 Fried Krupp Huettenwerke AG filed Critical Fried Krupp Huettenwerke AG
Publication of GB1579522A publication Critical patent/GB1579522A/en
Expired legal-status Critical Current

Links

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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C5/4613—Refractory coated lances; Immersion lances
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Description

(54) PLUNGER LANCE (71) We, FRIED. KRUPP HUTTENWERKE AG., of Alleestrasse 163, D4630 Bochum, West Germany, a body corporate organised under the laws of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:: The invention relates to a plunger lance for injecting solids in powder or dust form into a metallic melt, particularly steel, by means of a gaseous medium, said lance being composed of a metallic tube and a casing surrounding the tube composed of refractory nonmetallic material, in particular fireclay cement, which is strengthened by a reinforcement connected with the tube, which reinforcement is composed of several longitudinal ribs which are secured, particularly welded, onto the tube and distributed thereon in a peripheral direction.
With a known plunger lance of this type as shown in German Offenlegungsschrift Specification No. 2,626,892, the ribs are composed of flat iron which is welded in a star shape onto the outside of the tube. The free edges of the flat iron are interconnected at several points by a wire which is wound as a spiral round the longitudinal ribs. When such a plunger lance is used, vibrational cracks starting from the free edges of the longitudinal ribs appear in the casing despite the reinforcement, and thus parts of the refractory material chip off with the result that the casing can no longer sufficiently protect the metallic tube.
The object of the invention is to provide a plunger lance in which there is substantially no danger of cracks forming.
According to the invention a plunger lance for injecting solids in powder or dust form into a metallic melt by means of a gaseous medium comprises a metallic tube strengthened by means of several longitudinal ribs secured onto the tube and distributed thereon in a peripheral direction, each rib being formed by an angle section which, together with the outside of the tube forms a channel, and a casing of refractory non-metallic material surrounding the tube and the ribs.
The free edges of the flanges of the angle section are preferably welded onto the outside of the tube.
It has been shown that no vibrational cracks occur with such a plunger lance and therefore the use of such lances could be considerably increased in comparison with conventional lances.
The invention will be explained in more detail by way of example by reference to the drawing which shows a plunger lance constructed according to the invention, in crosssection.
The plunger lance shown is composed of a metallic cylindrical tube 1, in particular a steel tube, on the external surface of which three longitudinally extending equi-angularly spaced angle sections 2 are secured by the free edges of their flanges. To secure each flange edge a welded seam runs the entire length of each section 2. Angle sections 2 secured in such a manner on the tube 1 form hollow channel shaped spaces 3, by means of which the lance can be cooled. The tube 1 and the angle sections 2 are surrounded by a casing 4 composed of a refractory, non-metallic material, in particular fireclay cement. The refractory material is strengthened by raylike, rod-shaped reinforcements 5 each of which are secured with one end on the tube l or on one of the angle sections 2.
WHAT WE CLAIM IS 1. A plunger lance for injecting solids in powder or dust form into a metallic melt by means of a gaseous medium, said lance comprising a metallic tube strengthend by means of several longitudinal ribs secured onto the tube and distributed thereon in a peripheral direction, each rib being formed by an angle section which, together with the outside of the tube, forms a channel, and a casing of refractory non-metallic material surrounding the tube and the ribs.
2. A plunger lance according to claim 1, wherein the free edges of the flanges of the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. (54) PLUNGER LANCE (71) We, FRIED. KRUPP HUTTENWERKE AG., of Alleestrasse 163, D4630 Bochum, West Germany, a body corporate organised under the laws of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:: The invention relates to a plunger lance for injecting solids in powder or dust form into a metallic melt, particularly steel, by means of a gaseous medium, said lance being composed of a metallic tube and a casing surrounding the tube composed of refractory nonmetallic material, in particular fireclay cement, which is strengthened by a reinforcement connected with the tube, which reinforcement is composed of several longitudinal ribs which are secured, particularly welded, onto the tube and distributed thereon in a peripheral direction. With a known plunger lance of this type as shown in German Offenlegungsschrift Specification No. 2,626,892, the ribs are composed of flat iron which is welded in a star shape onto the outside of the tube. The free edges of the flat iron are interconnected at several points by a wire which is wound as a spiral round the longitudinal ribs. When such a plunger lance is used, vibrational cracks starting from the free edges of the longitudinal ribs appear in the casing despite the reinforcement, and thus parts of the refractory material chip off with the result that the casing can no longer sufficiently protect the metallic tube. The object of the invention is to provide a plunger lance in which there is substantially no danger of cracks forming. According to the invention a plunger lance for injecting solids in powder or dust form into a metallic melt by means of a gaseous medium comprises a metallic tube strengthened by means of several longitudinal ribs secured onto the tube and distributed thereon in a peripheral direction, each rib being formed by an angle section which, together with the outside of the tube forms a channel, and a casing of refractory non-metallic material surrounding the tube and the ribs. The free edges of the flanges of the angle section are preferably welded onto the outside of the tube. It has been shown that no vibrational cracks occur with such a plunger lance and therefore the use of such lances could be considerably increased in comparison with conventional lances. The invention will be explained in more detail by way of example by reference to the drawing which shows a plunger lance constructed according to the invention, in crosssection. The plunger lance shown is composed of a metallic cylindrical tube 1, in particular a steel tube, on the external surface of which three longitudinally extending equi-angularly spaced angle sections 2 are secured by the free edges of their flanges. To secure each flange edge a welded seam runs the entire length of each section 2. Angle sections 2 secured in such a manner on the tube 1 form hollow channel shaped spaces 3, by means of which the lance can be cooled. The tube 1 and the angle sections 2 are surrounded by a casing 4 composed of a refractory, non-metallic material, in particular fireclay cement. The refractory material is strengthened by raylike, rod-shaped reinforcements 5 each of which are secured with one end on the tube l or on one of the angle sections 2. WHAT WE CLAIM IS
1. A plunger lance for injecting solids in powder or dust form into a metallic melt by means of a gaseous medium, said lance comprising a metallic tube strengthend by means of several longitudinal ribs secured onto the tube and distributed thereon in a peripheral direction, each rib being formed by an angle section which, together with the outside of the tube, forms a channel, and a casing of refractory non-metallic material surrounding the tube and the ribs.
2. A plunger lance according to claim 1, wherein the free edges of the flanges of the angle section are welded onto the outside of the tube.
3. A plunger lance substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
GB4529/78A 1977-02-26 1978-02-03 Plunger lance Expired GB1579522A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2708410A DE2708410C2 (en) 1977-02-26 1977-02-26 Diving lance

Publications (1)

Publication Number Publication Date
GB1579522A true GB1579522A (en) 1980-11-19

Family

ID=6002241

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4529/78A Expired GB1579522A (en) 1977-02-26 1978-02-03 Plunger lance

Country Status (8)

Country Link
BE (1) BE863756A (en)
DE (1) DE2708410C2 (en)
FR (1) FR2381830A1 (en)
GB (1) GB1579522A (en)
IT (1) IT1092840B (en)
LU (1) LU79110A1 (en)
NL (1) NL177611C (en)
SE (1) SE426505B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001092586A1 (en) * 2000-05-30 2001-12-06 Technological Resources Pty Ltd Apparatus for injecting solid particulate material into a vessel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4367868A (en) * 1979-03-16 1983-01-11 Hoganas Ab Refractory lining for a metal pipe
DE2912195C2 (en) * 1979-03-28 1986-04-30 Mannesmann AG, 4000 Düsseldorf Desulfurization lance
DE3322556A1 (en) * 1983-06-23 1985-01-10 Didier-Werke Ag, 6200 Wiesbaden Lance for blowing fluidised materials into molten metal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001092586A1 (en) * 2000-05-30 2001-12-06 Technological Resources Pty Ltd Apparatus for injecting solid particulate material into a vessel

Also Published As

Publication number Publication date
IT1092840B (en) 1985-07-12
NL7801948A (en) 1978-08-29
LU79110A1 (en) 1978-06-27
DE2708410C2 (en) 1979-04-19
NL177611B (en) 1985-05-17
BE863756A (en) 1978-05-29
DE2708410B1 (en) 1978-08-24
FR2381830A1 (en) 1978-09-22
SE7801992L (en) 1978-08-27
FR2381830B3 (en) 1980-11-28
SE426505B (en) 1983-01-24
IT7820597A0 (en) 1978-02-24
NL177611C (en) 1985-10-16

Similar Documents

Publication Publication Date Title
WO2000009899A3 (en) Flexible pipe with i-shaped wire winding
ES8102655A1 (en) Insert for a hose coupling.
ES8307575A1 (en) Method and apparatus for shaping the ends of spirally-formed thermoplastic tube and pipe made thereby.
GB1579522A (en) Plunger lance
PT88744A (en) Fragmentation casing for explosive shell etc. - is helically weakened metal cylinder with joint line of gap spot-welded to hold ends together
DE3036763A1 (en) Refractory lining for a metal pipe
NO20005550D0 (en) Ammunition body, a method of insertion and its use
KR830002570A (en) Explosion welding method of metal pipe part
ES270905U (en) Metal band for locking tube joints
US4564319A (en) Flexible tube for conveying a mixture of a liquid and a solid material
IE772232L (en) Extendible reinforced concrete pile system
US2151847A (en) Metallic piling
EP2784366A1 (en) Pipe for transferring abrasive materials and corresponding method of production
EP0261365B1 (en) Immersion lance
FR2500482B1 (en) STEEL FOR WELDING WITH HIGH ENJOYMENT ENERGY
FR2402006A1 (en) Injection lance suitable for desulphurising molten iron - using finned pipe with anchors inside a refractory sleeve
ES8401219A1 (en) Nodal point for the constructions of metallic tubes, especially for drilling platforms.
SU1161774A1 (en) Reinforced concrete pressure vibrohydropressed pipe
JPS6028680Y2 (en) Gas injection lance for molten metal processing
SU1687394A1 (en) Method for building up cylindrical parts
JPS57145734A (en) Operation of ship loader
RU2005250C1 (en) Pipe
DE2849504A1 (en) Immersion lance for injecting gas or powder into molten metal - esp. into steel, where lance tube is reinforced by tubes carrying coolant
SU140666A1 (en) Mouthpiece to protect weld sites from oxidation
DE942637C (en) Process for the production of blow-off pipes with highly wear-resistant ends

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19940203