Evaluation of high chromium overlays to protect less alloyed substrates from corrosion in a coal gasification atmosphere. Quarterly report, December 1, 1978-February 28, 1979

Technical Report · Mon Jan 01 04:00:00 EST 1979

DOI:https://doi.org/10.2172/5206089· OSTI ID:5206089

Sadowski, E. P.

The 1000 hour exposure at 1800/sup 0/F in the coal gasification atmosphere was completed. The gas composition consisted of 12% CO/sub 2/, 18% CO, 24% H/sub 2/, 5% CH/sub 4/, 1% NH/sub 3/, 1% H/sub 2/S, and 39% H/sub 2/O. The gas was exchanged hourly. A detailed description of the test procedure and operation is appended to this report. Visual observation of unwelded samples of the substrate after exposure indicate that the corrosive environment was quite severe. The 304L coupons were completely disintegrated and the INCONEL alloy 800H was scaled severely. The 310 SS appeared to be reasonably corrosion resistant. The overlays of INCONEL Filler Metals 72, and R139 appeared corrosion resistant whereas the 309 overlay formed a scale which spalled. Stress rupture testing of composite specimens is essentially complete. The composition of the substrate had most effects on the stress rupture strength and the overlaid INCOLOY alloy 800H had the highest stress rupture strength. Generally, the gas metal arc processes gave higher stress rupture strength than the submerged-arc process. Microprobe analysis for elemental distribution showed that a higher Cr content was maintained for a greater depth in the overlay with the submerged-arc process than with the inert gas processes. Conversely, the Fe content of the overlays was the lowest with the submerged-arc process. The amount of Cr of the overlays deposited by the INCONEL Filler Metal 72 was not affected appreciably by the composition of the substrate except in the fusion area.

• Research Organization: International Nickel Co., Inc., Suffern, NY (USA). INCO Research and Development Center
• OSTI ID: 5206089
• Report Number(s): FE-2621-10
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ARC WELDING
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COAL GASIFICATION
COAL GASIFICATION PLANTS
COATINGS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
FABRICATION
FAILURES
FRACTURE PROPERTIES
GAS METAL-ARC WELDING
GASIFICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY 800
INCOLOY ALLOYS
INDUSTRIAL PLANTS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
NICKEL ALLOYS
PROTECTIVE COATINGS
RUPTURES
STAINLESS STEEL-304
STAINLESS STEEL-310
STAINLESS STEELS
STEELS
SUBMERGED ARC WELDING
TESTING
THERMOCHEMICAL PROCESSES
WELDING