(19) |
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(11) |
EP 0 120 441 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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01.07.1987 Bulletin 1987/27 |
(43) |
Date of publication A2: |
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03.10.1984 Bulletin 1984/40 |
(22) |
Date of filing: 20.03.1984 |
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(84) |
Designated Contracting States: |
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CH DE FR GB IT LI NL SE |
(30) |
Priority: |
28.03.1983 US 479707
|
(71) |
Applicant: KENNAMETAL INC. |
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() |
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(54) |
Roll for hot forming steel rod |
(57) Disclosed herein is a carbide roll having an improved composition for hot forming
steel rod in multi-stand rolling mills. The improved composition comprises the addition
of nickel as a binder material to a normal tungsten carbide-cobalt roll composition,
preferably, so that the composition by volume is approximately: tungsten carbide-70
percent; nickel-10 percent; and cobalt- 20 percent. A dual composition is disclosed,
wherein the above composition forms the inner layer of the roll and an outer layer
may be composed of, by volume, tungsten carbide - 70 percent and cobalt - 30 percent.