Composition-based correlations to predict sensitization resistance of austenitic stainless steels
Composition-based correlations to predict the relative sensitization resistance of AISI 304 and 316 stainless steel (SS) have been evaluated by comparison to a large data base. The best fit to experimental data was achieved using a slightly modified version of Cihal's elemental parameters: Cr) = Cr + 1.6 Mo - 0.2 Ni - 100 C where Cr) is the composite chromium concentration, and all concentrations are expressed as weight percentages (wt%). This composite chromium term effectively normalizes the effects of the major alloying elements on sensitization resistance. Attempts to add other alloying elements such as manganese, silicon, and nitrogen to the equation did not improve the correlation to the data base. Quantitative degree-of-sensitization (DOS) measurements were made on 14 heats of AISI 304 and 316 SS after various isothermal heat treatments using the electrochemical potentiokinetic reactivation (EPR) technique. Comparisons among these heats were found to be consistent with the proposed composite chromium formulism.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5685502
- Journal Information:
- Corrosion (Houston); (United States), Vol. 42:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
STAINLESS STEEL-304
CORROSION RESISTANCE
STAINLESS STEEL-316
CHEMICAL COMPOSITION
CHROMIUM
CORRELATIONS
ELECTROCHEMISTRY
EQUATIONS
HEAT TREATMENTS
ISOTHERMAL PROCESSES
MANGANESE ADDITIONS
METALLURGICAL EFFECTS
NICKEL ADDITIONS
NITROGEN ADDITIONS
QUANTITY RATIO
SILICON ADDITIONS
ALLOYS
CHEMISTRY
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ALLOYS
MATERIALS
METALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
SILICON ALLOYS
STAINLESS STEELS
STEELS
TRANSITION ELEMENTS
360105* - Metals & Alloys- Corrosion & Erosion