DE945930C - Process for the production of wear-resistant pipes for the hydraulic and pneumatic conveying of bulk goods - Google Patents

Process for the production of wear-resistant pipes for the hydraulic and pneumatic conveying of bulk goods

Info

Publication number
DE945930C
DE945930C DEP29100A DEP0029100A DE945930C DE 945930 C DE945930 C DE 945930C DE P29100 A DEP29100 A DE P29100A DE P0029100 A DEP0029100 A DE P0029100A DE 945930 C DE945930 C DE 945930C
Authority
DE
Germany
Prior art keywords
wear
hydraulic
production
pneumatic conveying
resistant pipes
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
DEP29100A
Other languages
German (de)
Inventor
Dipl-Ing Hermann Holtey
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.)
GEWERK REUSS
Original Assignee
GEWERK REUSS
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 GEWERK REUSS filed Critical GEWERK REUSS
Priority to DEP29100A priority Critical patent/DE945930C/en
Application granted granted Critical
Publication of DE945930C publication Critical patent/DE945930C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Heat Treatment Of Articles (AREA)

Description

Verfahren zur Herstellung verschleißfester Rohre für die hydraulische und pneumatische Förderung von Schüttgütern Für die pneumatische oder hydraulische Förderung von Schüttgütern, z. B. für den Bergeversatz, haben sich Stahlrohre mit gehärteter Innenseite sehr bewährt. Man stellt derartige Rohre bisher in der Weise her, daß man zweilagige Verbundstahlbleche mit einer härtbaren Stahlschicht und einer Schicht aus nicht härtbarem Eisen zu Rohren rollt, wobei die härtbare Schicht innen liegt, und danach längs verschweißt. Man kann auch von nahtlosen Verbundstahlrohren gleicher Art ausgehen. Beim Härten der Rohre nimmt die Innenschicht hohe Härte und Verschleißfestigkeit an, während die Außenschicht weich, zäh und bruchfest bleibt, was im Hinblick auf die mechanischen Beanspruchungen, denen solche Rohre bei ihrer Verwendung ausgesetzt sind, notwendig ist. , Die Erfindung löst demgegenüber die Aufgabe, ein für den Bergbau od. dgl. geeignetes Rohr mit gehärteter, verschleißfester Innenseite auf einem anderen Wege als über den eines mehrschichtigen Rohres herzustellen.Process for the production of wear-resistant pipes for hydraulic and pneumatic conveying of bulk materials For pneumatic or hydraulic Conveyance of bulk materials, e.g. B. for the mountain offset, have steel pipes with hardened inside very well proven. So far, such pipes have been made in this way ago that you have two-layer composite steel sheets with a hardenable steel layer and a layer of non-hardenable iron rolls into pipes, the hardenable layer inside, and then welded lengthways. One can also use seamless composite steel pipes go out of the same kind. When the pipes harden, the inner layer takes on high hardness and Wear resistance, while the outer layer remains soft, tough and unbreakable, what with regard to the mechanical stresses that such pipes face during their Use is necessary. In contrast, the invention solves the Task, a for mining od. The like. Suitable tube with hardened, wear-resistant The inside can be produced in a different way than that of a multilayer pipe.

Die Erfindung geht hierbei von einschichtigen Rohren aus härtbarerm Stahl aus, härtet dieise auf der Innenwandung und läßt sie aber gleichzeitig von außen her derart an, daß mindestens die innere Hälfte der Wandstärke glashart und verschleißfest und die äußere Hälfte der Wandstärke durch die Anlaßbehandlung weich, zäh und bruchfest wird. Das den Gegenstand der Erfindung bildende Verfahren besteht darin, daß das zunächst im ganzen auf Härtetemperatur erhitzte Rohr in fortschreitender Arbeitsweise innen durch Wasser oder ein anderes Mittel abgeschreckt wird, während. gleichzeitig die Außenschicht mit Hilfe eines ringförmigen Azetylen-Leuchtgas-Sauerstoffbrenners partiell fortschreitend auf Anlaßtemperatur gehalten wird.The invention is based on single-layer pipes made of hardenable material Steel hardens it on the inner wall and leaves it at the same time on the outside in such a way that at least the inner half of the wall thickness is glass-hard and wear-resistant and the outer half of the wall thickness is soft due to the tempering treatment, becomes tough and unbreakable. That forming the subject of the invention The method consists in that the initially heated as a whole to the hardening temperature Pipe in progressive operation inside by water or some other means is deterred while. at the same time the outer layer with the help of an annular Acetylene luminous gas oxygen burner partially progressing to tempering temperature is held.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung verschleißfester Rohre für die hydraulische oder pneumatische Förderung von Schüttgut, insbesondere Blasversatz, mit gehärteter Innenschicht und ungehärteter Außenschicht, dadurch gekennzeichnet, daß der Rohrkörper nach Erhitzen. auf die Härtetemperaturen in fortschreitender Arbeitsweise innen mittels Wasser unter Härten der Innenschicht abgeschreckt wird, während gleichzeitig die Außenschicht durch Zuführung von Wärme partiell fortschreitend auf der, zum Anlasseen erforderlichen Temperatur gehalten wird. In Betracht gezogene Drucksohriften: Deutsche Patentschriften Nr. L,:8 5o6, 50 758, 656 830; österreichische Patentschriften Nr. 5o 650, 61 388; USA.-Patentschrift Nr. 2 280 552. -PATENT CLAIM: Process for the production of wear-resistant pipes for the hydraulic or pneumatic conveying of bulk material, in particular blow-off, with a hardened inner layer and an unhardened outer layer, characterized in that the pipe body after heating. The inner layer is quenched to the hardening temperatures in progressive operation by means of water with hardening of the inner layer, while at the same time the outer layer is kept partially progressively at the temperature required for tempering by supplying heat. Printed publications under consideration: German Patent Specifications No. L,: 8 5o6, 50 758, 656 830; Austrian Patent Nos 5o 650, 61388. U.S. Patent No. 2,280,552.
DEP29100A 1949-01-01 1949-01-01 Process for the production of wear-resistant pipes for the hydraulic and pneumatic conveying of bulk goods Expired DE945930C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEP29100A DE945930C (en) 1949-01-01 1949-01-01 Process for the production of wear-resistant pipes for the hydraulic and pneumatic conveying of bulk goods

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP29100A DE945930C (en) 1949-01-01 1949-01-01 Process for the production of wear-resistant pipes for the hydraulic and pneumatic conveying of bulk goods

Publications (1)

Publication Number Publication Date
DE945930C true DE945930C (en) 1956-07-19

Family

ID=7371457

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP29100A Expired DE945930C (en) 1949-01-01 1949-01-01 Process for the production of wear-resistant pipes for the hydraulic and pneumatic conveying of bulk goods

Country Status (1)

Country Link
DE (1) DE945930C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0151838A1 (en) * 1984-01-10 1985-08-21 Indutech Limited Heat treating hardenable carbon steel pipe

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE48506C (en) * H. ST. MAXIM in London, England Device for hardening gun tubes
DE50758C (en) * M. KRAMER in Berlin N., Chausseestr. 1 Process for hardening the inside of steel pipes with a small clear width
AT50650B (en) * 1907-09-23 1911-11-10 Cie Forges Et Acieries Marine Process for the production of armor plates and similar objects from chrome-nickel steel.
AT61388B (en) * 1910-10-14 1913-09-25 Vickers Ltd Process for hardening armor plates made of nickel steel.
DE656830C (en) * 1938-04-14 Franz Bark Device for hardening the inner wall of pipes and similar hollow bodies
US2280552A (en) * 1939-03-23 1942-04-21 Budd Induction Heating Inc Method and apparatus for manufacturing piston rings

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE48506C (en) * H. ST. MAXIM in London, England Device for hardening gun tubes
DE50758C (en) * M. KRAMER in Berlin N., Chausseestr. 1 Process for hardening the inside of steel pipes with a small clear width
DE656830C (en) * 1938-04-14 Franz Bark Device for hardening the inner wall of pipes and similar hollow bodies
AT50650B (en) * 1907-09-23 1911-11-10 Cie Forges Et Acieries Marine Process for the production of armor plates and similar objects from chrome-nickel steel.
AT61388B (en) * 1910-10-14 1913-09-25 Vickers Ltd Process for hardening armor plates made of nickel steel.
US2280552A (en) * 1939-03-23 1942-04-21 Budd Induction Heating Inc Method and apparatus for manufacturing piston rings

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0151838A1 (en) * 1984-01-10 1985-08-21 Indutech Limited Heat treating hardenable carbon steel pipe

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