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1. WO1981001156 - FERROUS ALLOY WITH HIGH MOLYBDENUM AND CHROMIUM CONTENT

Publication Number WO/1981/001156
Publication Date 30.04.1981
International Application No. PCT/CH1980/000128
International Filing Date 24.10.1980
IPC
C22C 38/22 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
22with molybdenum or tungsten
CPC
C22C 38/22
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
22with molybdenum or tungsten
Applicants
Inventors
Priority Data
4697825.10.1979BE
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(EN) FERROUS ALLOY WITH HIGH MOLYBDENUM AND CHROMIUM CONTENT
(FR) ALLIAGE FERREUX, A HAUTE TENEUR EN MOLYBDENE ET CHROME
Abstract
(EN)
The composition of metal alloys expressed in percentages follow the following ponderal relationships: 3% (Alpha) chromium (Alpha) 20%; 7% (Alpha) molybdenum (Alpha) 40%; C (Alpha) 0.1%; Fe, together with its usual impurities and optionally Mn (:5% at the most), makes up the balance yet not smaller than 50%, the whole in a matrix, at least partially ferritic, and having separately or in admixture intermetallic compounds of the Laves and Ktypes. In these alloys, the resistance to corrosion increases together with the chromium content, which enhances the formation of the phase K. The molybdenum content is a direct function of the desired amount of intermetallic compounds. To give the alloys an improved hot resistance or in certain corrosive medium, up to half of molybdenum may be replaced by tungsten. The stability of the Laves and Kphases is improved by supplying silicium. These alloys exhibit simultaneously a good resistance to wear and corrosion and a low friction coefficient.
(FR)
La composition centesimale des alliages metalliques verifie les relations ponderales ci-apres: 3% (Alpha) chrome (Alpha) 20%; 7(Alpha) molybdene (Alpha) 40%; C (Alpha) 0,1% Fe accompagne de ses impuretes usuelles et eventuellement de Mn (au plus 2, 5%), constitue le solde non inferieur toutefois a 50%, le tout dans une matrice, au moins partiellement ferritique, et presentant isolement ou en melange des composes intermetalliques des types Laves et K. Dans ces alliages, la resistance a la corrosion augmente avec la teneur en chrome, laquelle favorise egalement la formation de la phase K, La teneur en molybdene est en fonction directe de la quantite de composes intermetalliques desiree. Pour conferer aux alliages une resistance accrue a chaud ou dans certains milieux corrosifs, on peut remplacer jusqu"a la moitie du molybdene par du tungstene. La stabilite des phases de Laves et K est augmentee par l"apport de silicium. Ces alliages presentent simultanement une bonne resistance a l"usure et a la corrosion et un faible coefficient de frottement.
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