US3814168A - Method for the centrifugal production of metal tubes - Google Patents

Method for the centrifugal production of metal tubes Download PDF

Info

Publication number
US3814168A
US3814168A US00288824A US28882472A US3814168A US 3814168 A US3814168 A US 3814168A US 00288824 A US00288824 A US 00288824A US 28882472 A US28882472 A US 28882472A US 3814168 A US3814168 A US 3814168A
Authority
US
United States
Prior art keywords
slag
metal
tube
mould
mass
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
US00288824A
Other languages
English (en)
Inventor
A Royer
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.)
Pont a Mousson SA
Original Assignee
Pont a Mousson SA
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 Pont a Mousson SA filed Critical Pont a Mousson SA
Application granted granted Critical
Publication of US3814168A publication Critical patent/US3814168A/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
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis

Definitions

  • ABSTRACT A method for the centrifugal production of a metal tube having a composition which varies within the 7 Claims, 2 Drawing Figures METHOD FOR THE CENTRIFUGAL PRODUCTION OF METAL TUBES
  • the present invention relates to a method for the centrifugal production of metal tubes the wall of which has a varying composition.
  • the inner surface layer have high hardness so as to resist abrasion whereas a lower hardness is required for an outer layer but with no brittleness while achieving between the layers, notwithstanding their differences, maximum cohesion to preclude formation of a film of oxide therebetween.
  • the method requires the use of two processing furnaces and, furthermore, the ratio between the thicknesses of the two layers may vary undesirably along a generatrix.
  • An object of the present invention is to avoid all these drawbacks by means of a centrifugal production method which puts to use the laws of diffusion of chemical elements in liquid bodies in the course of solidification.
  • the invention provides a method for the centrifugal production of a metal tube having a varying composition within the thickness of its wall, comprising pouring a mass of molten metal in a rotary mould then, before the complete solidification of said mass of metal, depositing on the mass of metal in the mould a molten slag containing addition elements, allowing the metal and the slag to solidify while continuing to rotate the mould until solidification of both of them, and removing the solidified slag.
  • the diffusion of the addition elements contained in the slag in the inner surface layer of the mass of molten metal modifies the composition and structure of said layer, so that there is obtained a metal part having a composition which varies within the thickness of its wall, the inner layer of the'tube being enriched with the addition elements.
  • the thickness of the inner layer and its content of addition elements depend on the time which elapses'between the pouring of the metal and the 1 pouring of the slag, on the composition of the slag, on the respective temperatures of the metal and slag at the moment of the pouring and on the speed of rotation of the mould. These parameters must therefore be chosen experimentally in accordance with requirements.
  • the metal is steel and the slag is a slag which isrich with graphite in suspension.
  • the inner layer is enriched with carbon which has a case-hardening effeet.
  • a slag having a low density is preferably chosen so as to avoid any risk in variation in the thickness of the two layers throughout the length of the tube.
  • a 18 CDV4 steel is taken having the following composition (percent by weight) according to a test or sample castmg:
  • FIG. 1 The structure of the tube obtained, as seen in section, is shown in FIG. 1.
  • the latter shows a section made after polishing and etching with ammonium persulfate. Analysis shows that the innersurface layer 1 having a thickness of 9 mm has'a carbon content exceeding 0.20 percent whereas the layer 2 which surrounds it has a content limited to 0.20 percent. The separation is perfectly clean and definite between the two layers.
  • FIG. 2 shows the variation in the carbon content of the tube as a function of the depth of the sample from the innermost layer of the tube, that is to say, the distance from the axis of the tube.
  • micrographic examinations shown after Nital etching, an inner layer having pearlite-cementite constituents, an intermediate transition layer of several metal tube having a composition which varies within the thickness of its wall and practically having two layers.
  • the method is therefore applicable in a general way to any action of a slag adding a metallic or metalloid element or elements to a metal in the course of solidification, on the sole condition that the metal receiving the element has the desired ability to fix the element and that the slag has a complementary composition adapted to perform the function of a vehicle for this element.
  • a method for the centrifugal production of a metal tube having a composition which varies within the thickness of the wall of the tube comprising the steps of pouring a single casting in a rotary mould of a single mass of molten metal having a composition corresponding to that required for the outer layer of the tube then, before the complete solidification of said mass of metal, depositing on the mass of metal in the mould a molten slag containing additional elements for superficial diffusion in said metal, said metal being capable of fixing said addition elements, diffusing said additional elements in an inner layer of said metal by allowing said metal and said slag to solidify while continuing to rotate the mould until solidification of both of them, and removing the solidified slag devoid of the addition elements which have diffused in said metal and produced said variation in the composition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Articles (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US00288824A 1971-09-24 1972-09-13 Method for the centrifugal production of metal tubes Expired - Lifetime US3814168A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7134380A FR2153195B1 (enrdf_load_stackoverflow) 1971-09-24 1971-09-24

Publications (1)

Publication Number Publication Date
US3814168A true US3814168A (en) 1974-06-04

Family

ID=9083423

Family Applications (1)

Application Number Title Priority Date Filing Date
US00288824A Expired - Lifetime US3814168A (en) 1971-09-24 1972-09-13 Method for the centrifugal production of metal tubes

Country Status (4)

Country Link
US (1) US3814168A (enrdf_load_stackoverflow)
DE (1) DE2246471C3 (enrdf_load_stackoverflow)
FR (1) FR2153195B1 (enrdf_load_stackoverflow)
GB (1) GB1399389A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4217948A (en) * 1977-08-29 1980-08-19 Borovinskaya Inna P Method for production of two-layer pipe casting
CN109967713A (zh) * 2019-04-08 2019-07-05 四川鑫鼎新材料有限公司 一种核屏蔽复合管及其制备方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4327798A (en) * 1980-05-01 1982-05-04 American Cast Iron Pipe Company Method of applying flux
IN154618B (enrdf_load_stackoverflow) * 1980-12-22 1984-11-17 Abex Corp
DE4108203A1 (de) * 1991-03-14 1991-09-26 Ge Yu Verfahren zur herstellung gussstueckes mit gezielter zusammensetzungsverteilung der legierungskomponenten

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1614863A (en) * 1925-12-02 1927-01-18 Sand Spun Patents Corp Centrifugally-cast pipe
US1678931A (en) * 1924-05-03 1928-07-31 Smith Corp A O Production of pipe couplings by centrifugal casting
US2745740A (en) * 1954-09-02 1956-05-15 Ford Motor Co Process of preparing an iron base melt
US3293708A (en) * 1964-03-04 1966-12-27 Black Clawson Co Method of centrifugally casting flanged tubular members
US3563300A (en) * 1967-07-01 1971-02-16 Kubota Iron & Machinery Works Centrifugal casting of a composite roller

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1678931A (en) * 1924-05-03 1928-07-31 Smith Corp A O Production of pipe couplings by centrifugal casting
US1614863A (en) * 1925-12-02 1927-01-18 Sand Spun Patents Corp Centrifugally-cast pipe
US2745740A (en) * 1954-09-02 1956-05-15 Ford Motor Co Process of preparing an iron base melt
US3293708A (en) * 1964-03-04 1966-12-27 Black Clawson Co Method of centrifugally casting flanged tubular members
US3563300A (en) * 1967-07-01 1971-02-16 Kubota Iron & Machinery Works Centrifugal casting of a composite roller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4217948A (en) * 1977-08-29 1980-08-19 Borovinskaya Inna P Method for production of two-layer pipe casting
CN109967713A (zh) * 2019-04-08 2019-07-05 四川鑫鼎新材料有限公司 一种核屏蔽复合管及其制备方法

Also Published As

Publication number Publication date
FR2153195B1 (enrdf_load_stackoverflow) 1974-09-06
FR2153195A1 (enrdf_load_stackoverflow) 1973-05-04
GB1399389A (en) 1975-07-02
DE2246471C3 (de) 1976-01-02
DE2246471A1 (de) 1973-04-05
DE2246471B2 (de) 1975-04-24

Similar Documents

Publication Publication Date Title
US3814168A (en) Method for the centrifugal production of metal tubes
EP0464780A1 (en) Abrasion-resistant cast iron material for rolling rolls and composite rolls
US3954133A (en) Spheroidal graphite cast iron pipe of ferritic structure and method of producing the same
Itofuji et al. Ultrafine spheroidal graphite iron castings
US2681485A (en) Centrifugal casting of metal
US4240494A (en) Method for centrifugal casting of tubular metal blanks
US2783169A (en) Process of producing nitrogen rich wrought austenitic alloys
US3862840A (en) Process for manufacture of hard and non-deformable alloys without compacting by sintering in the solid-liquid phase
GB1455172A (en) Centrifugal casting method
CA1191326A (en) Aluminized castings
Joshi Centrifugal casting
US3225399A (en) Casting process using borax-silica slag
JPS5929097B2 (ja) 耐摩耗鋳鉄
US3844776A (en) Method of casting inoculated metals
US1648471A (en) Casting
RU2840420C1 (ru) Способ производства толстостенных центробежнолитых трубных заготовок
JPS5829560A (ja) アルミナイズド鋳物の製造方法
JPS642181B2 (enrdf_load_stackoverflow)
US2420298A (en) Method of centrifugal casting
Stefanescu The effect of mould/metal interface phenomena on the surface quality of castings
SU784978A1 (ru) Способ нанесени теплоизол ционного сло на внутреннюю поверхность вращающейс изложности
JPS586769A (ja) 円筒、円柱状耐摩耗鋳物およびその製造法
Bailey THE INFLUENCE OF DISSOLVED GASES
RU2606824C2 (ru) Способ центробежной отливки тонкостенных труб из жаропрочных сплавов
Kvon et al. Vibration impact on properties and parameters of steel ingot porous structure