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Title: Sulfidation-resistant alloy for coal gasification service. Quarterly report, 1 June--31 August 1977

Abstract

A preliminary evaluation of the two most promising compositions for an improved sulfidation resistant alloy has been completed. An Fe--/sup 17/Cr--/sup 3/Si provides good resistance to sulfidation in ERDA/MPC gasification atmosphere with 0.5 to 1.0% H/sub 2/S at 1800/sup 0/F. No internal sulfidation was detected under steady state or cyclic heating conditions to 1000 hr exposure. The alloy, however, is susceptible to localized oxidation attack and develops pits 1 to 1.5 mil deep in 1000 hr. External sulfidation occurs as a result in these areas and the alloy is close to failure at 1000 hr. The addition of 1% Hf and 1 to 2% Mo had no effect on behavior. Fe--Cr--Si alloys in this composition range are considered to have little potential for long term service under these conditions. Fe--Cr--Al alloys with 16 to /sup 18/Cr, 4 to /sup 6/Al, 0 to /sup 2/Mo, and /sup 1/Hf provide equally good resistance to 1000 hr and beyond and are considered to have good potential for longer term service. No internal sulfidation was detected in 1000 hr at 1800/sup 0/F under cyclic or steady state heating conditions. The 1% Hf addition is essential to the cyclic use of these alloys and resultsmore » in the formation of protective alumina scales that do not spall on cooling. The lower Cr(16%) compositions wear out and sulfidize in about 1000 hr and a minimum of /sup 18/Cr appears to be required for long term service. An alloy of Fe--/sup 18/Cr--/sup 5/Al--/sup 2/Mo--/sup 1/Hf has better resistance to sulfidation in the ERDA/MPC gas with 0.5 to 1% H/sub 2/S than either 310SS or Ni--/sup 50/Cr. Assuming a linear rate of reaction, the mils/year penetration is 13 to 21 for the Fe--Ni--Cr and Ni--Cr alloys and 7 for the Fe--Cr--Al--Mo--Hf alloy. This composition meets the program objective of less than 20 MPY penetration under these conditions with a low Cr, Ni-free alloy.« less

Authors:
;
Publication Date:
Research Org.:
Lockheed Palo Alto Research Labs., Calif. (USA); Univ. of California, Berkeley, CA (United States)
OSTI Identifier:
7033671
Report Number(s):
FE-2299-15
TRN: 78-013562
DOE Contract Number:  
EX-76-C-01-2299
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 01 COAL, LIGNITE, AND PEAT; ALUMINIUM ALLOYS; CORROSION RESISTANCE; CHROMIUM ALLOYS; HAFNIUM ALLOYS; IRON BASE ALLOYS; SILICON ALLOYS; SULFUR COMPOUNDS; CORROSIVE EFFECTS; COAL GASIFICATION; PITTING CORROSION; VERY HIGH TEMPERATURE; ALLOYS; CHEMICAL REACTIONS; CORROSION; GASIFICATION; IRON ALLOYS; 360105* - Metals & Alloys- Corrosion & Erosion; 010404 - Coal, Lignite, & Peat- Gasification

Citation Formats

Perkins, R. A., and Bhat, M. S. Sulfidation-resistant alloy for coal gasification service. Quarterly report, 1 June--31 August 1977. United States: N. p., 1977. Web. doi:10.2172/7033671.
Perkins, R. A., & Bhat, M. S. Sulfidation-resistant alloy for coal gasification service. Quarterly report, 1 June--31 August 1977. United States. doi:10.2172/7033671.
Perkins, R. A., and Bhat, M. S. Thu . "Sulfidation-resistant alloy for coal gasification service. Quarterly report, 1 June--31 August 1977". United States. doi:10.2172/7033671. https://www.osti.gov/servlets/purl/7033671.
@article{osti_7033671,
title = {Sulfidation-resistant alloy for coal gasification service. Quarterly report, 1 June--31 August 1977},
author = {Perkins, R. A. and Bhat, M. S.},
abstractNote = {A preliminary evaluation of the two most promising compositions for an improved sulfidation resistant alloy has been completed. An Fe--/sup 17/Cr--/sup 3/Si provides good resistance to sulfidation in ERDA/MPC gasification atmosphere with 0.5 to 1.0% H/sub 2/S at 1800/sup 0/F. No internal sulfidation was detected under steady state or cyclic heating conditions to 1000 hr exposure. The alloy, however, is susceptible to localized oxidation attack and develops pits 1 to 1.5 mil deep in 1000 hr. External sulfidation occurs as a result in these areas and the alloy is close to failure at 1000 hr. The addition of 1% Hf and 1 to 2% Mo had no effect on behavior. Fe--Cr--Si alloys in this composition range are considered to have little potential for long term service under these conditions. Fe--Cr--Al alloys with 16 to /sup 18/Cr, 4 to /sup 6/Al, 0 to /sup 2/Mo, and /sup 1/Hf provide equally good resistance to 1000 hr and beyond and are considered to have good potential for longer term service. No internal sulfidation was detected in 1000 hr at 1800/sup 0/F under cyclic or steady state heating conditions. The 1% Hf addition is essential to the cyclic use of these alloys and results in the formation of protective alumina scales that do not spall on cooling. The lower Cr(16%) compositions wear out and sulfidize in about 1000 hr and a minimum of /sup 18/Cr appears to be required for long term service. An alloy of Fe--/sup 18/Cr--/sup 5/Al--/sup 2/Mo--/sup 1/Hf has better resistance to sulfidation in the ERDA/MPC gas with 0.5 to 1% H/sub 2/S than either 310SS or Ni--/sup 50/Cr. Assuming a linear rate of reaction, the mils/year penetration is 13 to 21 for the Fe--Ni--Cr and Ni--Cr alloys and 7 for the Fe--Cr--Al--Mo--Hf alloy. This composition meets the program objective of less than 20 MPY penetration under these conditions with a low Cr, Ni-free alloy.},
doi = {10.2172/7033671},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1977},
month = {11}
}