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1. WO2017182361 - SEAMLESS METAL TUBES

Publication Number WO/2017/182361
Publication Date 26.10.2017
International Application No. PCT/EP2017/058791
International Filing Date 12.04.2017
IPC
B22F 3/15 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
3Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor
12Both compacting and sintering
14simultaneously
15Hot isostatic pressing
B22F 3/17 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
3Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor
17by forging
B22F 5/10 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
5Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
10of articles with cavities or holes, not otherwise provided for in the preceding subgroups
B22F 3/24 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
3Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor
24After-treatment of workpieces or articles
CPC
B22F 2003/241
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
3Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; ; Presses and furnaces
24After-treatment of workpieces or articles
241Chemical after-treatment on the surface
B22F 3/15
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
3Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; ; Presses and furnaces
12Both compacting and sintering
14simultaneously
15Hot isostatic pressing
B22F 3/17
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
3Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; ; Presses and furnaces
17by forging
B22F 5/106
BPERFORMING OPERATIONS; TRANSPORTING
22CASTING; POWDER METALLURGY
FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
5Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
10of articles with cavities or holes, not otherwise provided for in the preceding subgroups
106Tube or ring forms
Applicants
  • METALVALUE SAS [FR]/[FR]
Inventors
  • ÅSLUND, Christer
  • HONNART, Alain
Agents
  • STRÖM & GULLIKSSON AB
Priority Data
1650516-618.04.2016SE
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) SEAMLESS METAL TUBES
(FR) TUBES MÉTALLIQUES SANS SOUDURE
Abstract
(EN)
A method for the manufacture of seamless metal tubes comprising the steps of: a) providing a capsule having the shape of a hollow block, b) filling the capsule with a metal powder, c) subjecting the filled capsule to hot isostatic pressing to obtain a density of 95% - 98% of TD to obtain a hollow block, d) working the hollow block into a finished seamless tube in one or more steps, during which step(s) the density is increased to full density, whereby the cross sectional area of the hollow block is decreased at least with a factor 2.5. The hollow block has a fine grain structure compared to the traditional cast material with a coarse grain structure which is more sensitive to cracks. A capsule protects the powder and material inside the capsule, for instance from oxidation but also from cracking. It is possible to manufacture tubes of compound materials, as well as tubes of alloys which are otherwise difficult to make tubes of. Tubes for high temperature applications are also possible to manufacture.
(FR)
La présente invention concerne un procédé de fabrication de tubes métalliques sans soudure qui comprend les étapes consistant à : a) fournir une capsule ayant la forme d'un bloc creux, b) remplir la capsule avec une poudre métallique, c) soumettre la capsule remplie à une compression isostatique à chaud pour obtenir une densité de 95 % à 98 % de TD et obtenir un bloc creux, d) transformer le bloc creux en un tube continu fini en une ou plusieurs étapes, au cours desquelles la densité est augmentée jusqu'à une densité totale, en réduisant ce faisant la surface de section transversale du bloc creux d'au moins un facteur 2,5. Le bloc creux a une structure de grain fin par rapport au matériau coulé classique, qui a une structure de grain grossier et qui est plus sensible aux fissures. Une capsule protège la poudre et le matériau à l'intérieur de la capsule, par exemple contre l'oxydation mais également contre la fissuration. Il est possible de fabriquer des tubes de matériaux composés, ainsi que des tubes d'alliages qui sont habituellement difficiles à transformer en tubes. Il est également possible de fabriquer des tubes pour des applications à haute température.
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