Oxidation/corrosion behavior of low-chromium Fe-Cr-Ni alloys containing zirconium or niobium

Conference · Sat Feb 01 04:00:00 EST 1986

OSTI ID:6242906

Baxter, D J; Natesan, K

Chromium is a vital constituent in many alloys and, as a general rule, at least 20 wt % Cr is required for the formation of protective scales on Fe-Cr-Ni alloys at temperatures up to 1000/sup 0/C. However, in view of the strategic nature of Cr, it is desirable that new alloys with lower Cr contents be developed in order that the overall demand for Cr can be reduced. To address this requirement, a new series of Fe, 12% Cr, 8 to 12% Ni alloys containing Zr or Nb has been designed. Zirconium or Nb concentrations of up to 6 wt % were used to compensate for the low Cr contents, with the aim of providing oxidation/corrosion resistance comparable to that of commercial alloys containing in excess of 20% Cr. Experimental results show that at a high p/sub O/sub 2//, 1% Zr or Nb is sufficient to promote protective oxidation behavior, whereas at a low p/sub O/sub 2//, more than 3% of the quaternary addition may be required. In mixed-oxidant (O/sub 2//S/sub 2/) environments, Zr and Nb reduce both scaling rates and internal penetration of aggressive elements from the exposure environments.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6242906
• Report Number(s): CONF-860340-1; ON: DE86008005
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANCE
ELEMENTS
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON ALLOYS
IRON BASE ALLOYS
NICKEL ALLOYS
NIOBIUM ALLOYS
NONMETALS
OXIDATION
OXYGEN
SCALING
STEELS
SULFIDATION
SULFIDES
SULFUR
SULFUR COMPOUNDS
VERY HIGH TEMPERATURE
ZIRCONIUM ALLOYS