Alloy evaluation for fossil fuel process plants (liquefaction)

Technical Report · Mon Oct 02 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6233269· OSTI ID:6233269

Woods, C M; Scott, T E

Base properties were determined for A387-74A-Gr.22-C1.2 steel after exposures to various temperatures and pressures in inert environments. Room temperature mechanical properties were determined for samples exposed to a coal slurry environment at various temperatures, H/sub 2/ pressures and applied stresses. Tests in inert atmospheres were completed to monitor the actual stress level as a function of exposure time in tensile samples loaded in pre-compressed rings. Creep measurements were made at various stress levels at 900/sup 0/F and plotted vs time for 168 hours. Electron microprobe analyses were performed on both the sample cross section and the surface oxide layer that formed during exposure to the coal slurry. Microstructural analyses before and after exposure to the coal slurry were carried out on A387, 316 SS, and 304 SS. Qualitative analysis of a crystalline condensate that formed on the pressure vessel Inconel rupture disc during a 168-hour exposure to H/sub 2/-coal slurry revealed sulfur as a predominant element in the atmosphere above the slurry. 316 SS loading rings were calibrated before and after each exposure to the slurry environment. No degradation was noted. Room temperature mechanical properties of samples exposed to the coal slurry-H/sub 2/ environment, when compared with base properties, revealed certain trends that indicate a necessity for longer exposure testing. Electron microprobe analysis disclosed a pronounced diffusion of Cr and Mo to the surface as well as a complex surface oxide layer composed of Cr, Mo, C, Fe, S, O, and Al. Microstructural observations revealed no appreciable change in the bulk matrix microstructure of A387, 316 SS, or 304 SS due to exposure to the slurry; the surface oxide layer consisted of two to four regions of varying compositions.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6233269
• Report Number(s): IS-4587
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHEMICAL ANALYSIS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COAL LIQUEFACTION PLANTS
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CREEP
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
DATA
DATA FORMS
ELECTRON MICROPROBE ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROGEN
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROANALYSIS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NONMETALS
NUMERICAL DATA
STAINLESS STEEL-304
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
TABLES
TESTING