Sulfidation resistant coatings for coal gasification process equipment. Final technical report. [FeCrAl and CoCrAl alloys]

Technical Report · Wed May 01 04:00:00 EDT 1985

OSTI ID:5900581

Perkins, R A; Packer, C M

This report presents the results of a program of research to develop and evaluate sulfidation resistant coatings for low alloy and stainless steel components of coal gasification process equipment. Furnace fused CoCrAl and FeCrAl coatings were developed for use on 304SS, and laboratory tests indicate good resistance to attack by simulated slagging gasifier atmospheres at 1000 to 1300/sup 0/F (538 to 704/sup 0/C). The CoCrAl coating exhibits the best performance and will protect 304SS at 1000 to 1600/sup 0/F (537 to 871/sup 0/C) for over 1500 hr. These coatings will protect 304SS at 1600/sup 0/F (871/sup 0/C) at the highest level of P/sub S/sub 2// for any level of P/sub O/sub 2// compared with other alloys and surface coatings. Weld parameters were studied for the deposition of FeCrAl clad layers on FeCrAl and Alloy 800 plate and on T-91 steel tube. Crack-free weld deposited layers could not be produced under any conditions for alloys with as little as 4% Al and the technical feasibility of cladding steels with weld deposited FeCrAl is considered to be poor. Similar results were obtained in tests by laser surface fusion of CoCrAl and FeCrAl coatings on 310SS and T-11 steel. The technical feasibility of aluminizing and chromizing low alloy steels by a slip pack diffusion process has been demonstrated. High quality aluminide coatings on T-11 steel resistant to CGA attack at 1000 to 1600/sup 0/F were produced. Performance was equal to or better than that of commercial pack aluminized steels. The process is considered to have the potential for a major improvement in quality and performance of large, complex components aluminized by the pack diffusion process. Development and scale up of the process is recommended. 30 refs., 63 figs., 38 tabs.

• Research Organization: Lockheed Missiles and Space Co., Palo Alto, CA (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5900581
• Report Number(s): LMSC-D-879299; ON: DE85011922
• 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
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COAL GASIFICATION PLANTS
COBALT ALLOYS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
DATA
DEPOSITION
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY 800H
INCOLOY ALLOYS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MANGANESE ADDITIONS
MANGANESE ALLOYS
MATERIALS
MATERIALS TESTING
NICKEL ALLOYS
NONMETALS
NUMERICAL DATA
OXYGEN
SILICON ADDITIONS
SILICON ALLOYS
STAINLESS STEEL-304
STAINLESS STEEL-310
STAINLESS STEELS
STEELS
SULFUR
SURFACE COATING
TESTING
TITANIUM ADDITIONS
TITANIUM ALLOYS
VERY HIGH TEMPERATURE
WELDING