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A corrosion and metallurgical evaluation of co-extruded tubing after 17 years of service in a coal fired utility boiler

Conference ·
OSTI ID:6952976
; ;
INCOCLAD 671/800H clad tubing was installed in a power generating station in 1967 and 1968. Sections of these tubes were removed periodically for metallurgical evaluation. The last section of tubing removed had been exposed for over 17 years in a boile reheater section operating at 1005/sup 0/F (540/sup 0/C) and a steam pressure of 475-500 psig (3.28-3.45 MPa). The tubing is a duplex product consisting of a tube of INCOLOY nickel-iron-chromium alloy 800H with an exterior cladding of INCONEL alloy 671 (''50/50'' nickel-chromium). The alloy 800H provides the needed high temperature strength while the alloy 671 has good resistance to coal-ash corrosion. This paper describes the extent of corrosive attack of the cladding and reports the mechanical properties of the nickel-iron-chromium tube after 17 years of exposure. The attack, by erosion and corrosion, on the cladding varied relative to the fireside and backside positions. The alloy 800H tubing retained excellent properties after exposure. There was no deterioration of the metallurgical bond between the cladding and the tube.
OSTI ID:
6952976
Report Number(s):
CONF-870314-
Country of Publication:
United States
Language:
English

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Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200104 -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
AEROSOL WASTES
ALLOYS
ASHES
BOILERS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CLADDING
COAL
CORROSION
CORROSION RESISTANCE
CORROSIVE EFFECTS
DEPOSITION
ENERGY SOURCES
EROSION
EXTRUSION
FABRICATION
FLY ASH
FOSSIL FUELS
FUELS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
INCOLOY 800
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
NICKEL ALLOYS
RESIDUES
SURFACE COATING
TEMPERATURE EFFECTS
TUBES
WASTES