Title:
VALVE SEAT OF FLUID VALVE INCLUDING SEA WATER AND CHLORIDE
Document Type and Number:
Japanese Patent JP2637039
Kind Code:
B2
Abstract:
PURPOSE: To prevent grain boundary corrosion and stress corrosion cracking of a base material on a valve seat adjacent part by welding a specified composi tion alloy on a valve seat base material along upper and lower two layer, in a valve used in fluid including sea water and chloride.
CONSTITUTION: Alloy made of C: 0.15% or less, Cr: 14 to 25%, and Ni: 45 to 75%, and if required including Al: 0.8 to 2.0%, and made of Fe in the residual part substantially, is welded on a valve seat base material 4 as a deposited metal substrate 1 of a valve seat. (The numeral 3 shows a fused part of the substrate 1 and the base material 4). An alloy 2 made of C: 0.15% or less, Cr: 20 to 30%, Si: 3 to 7%, Fe: 3 to 8%, W: 1 to 3%, and Ni in the residual part substantially is welded on the upper layer of the substrate 1. It is thus possible to reduce a carbon amount on the fitting part of the alloy 2 and the base material 4 sufficiently on practical use when the deposition as the substrate 1 of the valve seat is carried out, and prevent grain boundary corrosion and stress corrosion cracking of the base material 4 of a valve seat adjacent part certainly.
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Inventors:
OKANO MASATOSHI
PPONDA HITOSHI
PPONDA HITOSHI
Application Number:
JP24462493A
Publication Date:
August 06, 1997
Filing Date:
September 30, 1993
Export Citation:
Assignee:
OKANO BARUBU SEIZO KK
International Classes:
F16K25/00; F16K15/03; (IPC1-7): F16K25/00; F16K15/03
Domestic Patent References:
| JP62255671A |
Attorney, Agent or Firm:
Soga Doteru (6 people outside)
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