Weld overlaying for corrosion resistance in coal-gasification atmospheres. Final report, August 15, 1977-August 15, 1979
Tests by others have indicated that at least 25% chromium is required to obtain long time protection in coal gasification atmospheres at 982/sup 0/C (1800/sup 0/F). High aluminum content may also be beneficial for this service. Two nickel-base filler metals designed to deposit high Cr and Cr-Al contents were used to surface Types 303L and 310 stainless steel (SS) and INCOLOY alloy 800H. Single and double layers of high chromium filler were deposited successfully using three weld processes: submerged-acr, gas metal-arc and gas tungsten-arc with a hot wire addition. The compositions of the deposited overlays were affected by the compositions of the filler metal and substrate, the percentage dilution, the percentage recovery of elements across the arc, and the composition of the flux used with the submerged arc welding process. All surfaced substrates had better corrosion resistance than the unprotected substrates when exposed for 1000 hours in a coal gasification atmosphere (CGA) at 982/sup 0/C (1800/sup 0/F). The extent of corrosion attack observed on the unprotected substrates indicated that the test conditions were very severe. The different filler metals, substrates or welding processes evaluated did not affect the as-welded room temperature tensile properties of composite specimens of overlay and substrate. The 1000-hour stress rupturere strength at 982/sup 0/C was, however, affected by substrate and weld process. The highest stress rupture strength was obtained with the INCOLOY alloy 800 H weldments. The room temperature yield and tensile strengths of all weldments decreased after exposure to the CGA.
- Research Organization:
- International Nickel Co., Inc., Suffern, NY (USA). INCO Research and Development Center
- DOE Contract Number:
- AC01-77ET10496
- OSTI ID:
- 6653972
- Report Number(s):
- FE-2621-15
- Country of Publication:
- United States
- Language:
- English
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Weld overlaying for corrosion resistance in coal gasification atmospheres
Evaluation of high chromium overlays to protect less alloyed substrates from corrosion in a coal gasification atmosphere. Quarterly report, August 15, 1977--November 30, 1977
Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CLADDING
COAL GASIFICATION
COAL GASIFICATION PLANTS
CORROSION
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DATA
DEPOSITION
EXPERIMENTAL DATA
FABRICATION
GASIFICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY 800
INCOLOY ALLOYS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
NICKEL ALLOYS
NUMERICAL DATA
SIMULATION
STAINLESS STEEL-304
STAINLESS STEEL-310
STAINLESS STEELS
STEELS
SURFACE COATING
TESTING
THERMOCHEMICAL PROCESSES
WELDING