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Valve having facing layers of co-free Ni-base Alloy
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Inventors: Takeshima, Kikuo; Kumagai, Shin; Koshiishi, Masato; Chiba, Yositeru;
Assignee: Hitachi, Ltd. (Tokyo, JP); Hitachi Kyowa Kogyo Co., Ltd. (Ibaraki-ken, JP)
Primary Examiner: Zimmerman; John
Assistant Examiner:
Attorney, Agent or Firm: Antonelli, Terry, Stout & Kraus, LLP
Hard facing layers provided on engagement portions of a valve body and engagement portions of a valve box of a valve apparatus, consisting of cobalt-free Ni-base alloys. One of the Ni-base alloys for the hard facing layers comprises not more than 15% Fe and less than 2% W (tungsten), and the other comprises more than 15% Fe. More specifically, one of the cobalt-free Ni-base alloys essentially consists of, by weight, 15 to 20% Cr, 5 to 10% Si, 10 to 15% Fe, less than 2% W, and the balance of Ni and unavoidable impurities, and has a Vickers hardness (Hv) 510 to 630, and the other essentially consists of, by weight, 5 to 15% Cr, 5 to 10% Si, more than 15% and not more than 30% Fe, 1 to 4% W, and the balance of Ni and unavoidable impurities, and has a Vickers hardness (Hv) 400 to 470. The valve apparatus of the invention is suitably installed in a water pipe line which communicates with a nuclear reactor. |
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DETAILED DESCRIPTION It is an object of the present invention to use, as materials of hard facing layers on engagement portions of a valve body and engagement portions of a valve box, alloys without Co (cobalt-free alloys) which have superior sliding properties and can endure a large number of repeating slidings and a high contact pressure.
Cobalt-free alloys for hard facing layers have been studied and developed so far in order to obtain wear resistance and erosion resistance which are as high as those of Co-base alloys.
As cobalt-free alloys for hard facing layers, there has been known a combination of Ni-base alloys which are different in hardness with each other, as mentioned above, for improving the wear resistance (see JP-A-3-36088).
In the invention, there is employed a combination of Ni-base alloys including larger amounts of Fe than the known combination of Ni-base alloys.
Thus, the sliding property of a valve body to which a high contact pressure is applied can be improved.
According to a primary feature of the invention, hard facing layers provided on engagement portions of a valve body and engagement portions of a valve box of a valve apparatus consist of cobalt-free Ni-base alloys, one of the Ni-base alloys for the hard facing layers comprises not more than 15% Fe and less than 2% W (tungsten), and the other of the Ni-base alloys for the hard facing layers comprises more than 15% Fe.
A suitable example of a combination of these Ni-base alloys for hard facing layers is an alloy essentially consisting of, by weight, 15 to 20% Cr, 5 to 10% Si, 10 to 15% Fe, less than 2% W, and the balance of Ni and unavoidable impurities, and having a Vickers hardness (Hv) is a range from 510 to 630, and an alloy essentially consisting of, by weight, 5 to 15% Cr, 5 to 10% Si, more than 15% and not more than 30% Fe, 1 to 4% W, and the balance of Ni and unavoidable impurities, and having a Vickers hardness (Hv) is a range from 400 to 470.
When ceramics coatings are formed on the surfaces of the valve body and the valve box where they are in sliding-contact with each other, including the valve body engagement portions and the valve box engagement portions, wear resistance of the valve apparatus can be effectively improved
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