Alloy 33, a new corrosion resistant austenitic material for the refinery industry and related applications

Conference · Fri Sep 01 04:00:00 EDT 1995

OSTI ID:99545

Koehler, M; Heubner, U ^[1]; Eichenhofer, K W; Renner, M ^[2]

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1. Krupp VDM GmbH, Werdohl (Germany)
2. Bayer AG, Leverkusen (Germany)

A new corrosion resistant austenitic material alloyed with nominally (wt. %) 33 Cr, 32 Fe, 31 Ni, 1.6 Mo, 0.6 Cu, 0.4 N exhibits excellent resistance to general and local corrosion in hot mineral acids and chloride bearing solutions. Furthermore, the new alloy stands out for its superior corrosion resistance in many other corrosive environments from acidic to alkaline including resistance to stress corrosion cracking. In mixed HNO{sub 3}/HF acids the corrosion resistance of Alloy 33 is superior to high chromium nickel-base alloys. In NAOH solutions the new alloy is applicable to conditions where the known stainless steels fail. Due to its high nitrogen content the new alloy exhibits a small grain size in its solution annealed condition and, consequently, a high yield strength and excellent toughness CP properties. Alloy 33 is easily welded without filler or using matching filler metal. Typical applications of Alloy 33 include heat exchangers, condenser tubes and other equipment for the Refinery Industry and the Chemical Process Industry as well as light weight structures in the Offshore Industry. Especially the multi-purpose character of Alloy 33 with respect to its corrosion resistance as well to acidic and alkaline media as to chloride bearing cooling waters opens a wide variety of applications.

• OSTI ID: 99545
• Report Number(s): CONF-950304--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
COMPARATIVE EVALUATIONS
COPPER ADDITIONS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
DATA
HYDROFLUORIC ACID
IRON ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NITRIC ACID
NITROGEN ADDITIONS
OFFSHORE PLATFORMS
PETROLEUM REFINERIES
PHOSPHORIC ACID
SULFURIC ACID
USES