Weld overlaying for corrosion resistance in coal gasification atmospheres

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

DOI:https://doi.org/10.2172/5400891· OSTI ID:5400891

Sadowski, E. P.

Hardness and tensile testing of weldments which were exposed to a 1% H/sub 2/S coal gasification atmosphere for 1000 hours at 982/sup 0/C (1800/sup 0/F) was completed. Corrosion evaluation of unwelded specimens of 304L, 310 SS and INCOLOY alloy 800H was completed also. The INCONEL Filler Metal 72 and R139 overlays increased and the AWS-ER309 overlays decreased in hardness after exposure. The welding process used had very little effect on the response of the FM-72 overlays, while the R139 deposited by the SAW process had the least increase in hardness. The latter may be associated with the lower Al recovery obtained with the SAW process. Generally, the heat-affected zone and base metals of all weldments decreased in hardness after exposure. All weldments decreased in room temperature yield and tensile strength after exposure. Most weldments suffered a decrease in tensile ductility. The 310 weldments had the largest percentage decrease and the 304L weldments the last percentage decrease in the original tensile ductility after exosure. The corrosion atmosphere was considered to be very severe based upon the degree of corrosion obtained in the unwelded substrates. The 304L was totally consumed as mixed oxides and sulfides. Alloy 800H was severely attacked with the formation of liquid sulfide scales and extensive oxidation. Type 310 stainless steel exhibited the best resistance to the environment and was only modestly attacked in three of four samples. The R139 and INCONEL Filler Metal 72 overlays appeared to be extremely corrosion resistant to the CGA atmosphere. A comprehensive evaluation is in progress.

• Research Organization: International Nickel Co., Inc., Suffern, NY (USA). INCO Research and Development Center
• OSTI ID: 5400891
• Report Number(s): FE-2621-13
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COAL GASIFICATION
COAL GASIFICATION PLANTS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DATA
DATA FORMS
EXPERIMENTAL DATA
FABRICATION
GASIFICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY 800
INCOLOY ALLOYS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
JOINTS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
METALLOGRAPHY
NICKEL ALLOYS
NUMERICAL DATA
STAINLESS STEEL-304
STAINLESS STEEL-310
STAINLESS STEELS
STEELS
TABLES
TESTING
THERMOCHEMICAL PROCESSES
WELDED JOINTS
WELDING