Properties of a modified type 329 weldable and SCC (stress corrosion cracking) resistant stainless steel
A new 44LN ferritic-austenitic steel has been developed which contains less carbon and more nickel and nitrogen than 329 steels and is 50-60% austenitic. Its ductile-to-brittle transition was more gradual than that of 329 steel. Its 475/sup 0/C embrittlement was delayed compared with 329 steel, but it was more sensitive to sigma-phase embrittlement. In tests for resistance to general and oxidizing corrosion, pitting corrosion, crevice corrosion, stress corrosion cracking, intergranular corrosion, and sulfide stress corrosion cracking, the 44LN had similar resistance as 329L and 316L steels towards acetic, formic, and dilute sulfuric acids, boiling nitric acid, and boiling MgCl/sub 2//U-bend, and better resistance in > 95% sulfuric acid, phosphoric acid, nitric acid plus anions, ferric chloride, sea water, CaCl/sub 2//stress, and sulfide. In extensive tests of welding and corrosion resistance of welds, the 44LN performed better than 329L and A669 steels. Among typical applications are: tube sheets, baffle plates, shells, and heads of heat exchangers in which ferritic stainless steels are used as tube material; coolers/condensers for the reaction products after ammonia oxidation in nitric acid plants; and transport and processing of sour gases and oils in the petroleum industry.
- Research Organization:
- Uddeholms A.B.
- OSTI ID:
- 6222991
- Report Number(s):
- CONF-800305-
- Journal Information:
- Natl. Assoc. Cooros. Eng 'Corros./80' Meet. Pap.; (United States), Journal Name: Natl. Assoc. Cooros. Eng 'Corros./80' Meet. Pap.; (United States) Vol. 96
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ACETIC ACID
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
AMMONIA
AUSTENITIC STEELS
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CARBON
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COMPARATIVE EVALUATIONS
CORROSION
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
ELEMENTS
EMBRITTLEMENT
FORMIC ACID
HALIDES
HALOGEN COMPOUNDS
HYDRIDES
HYDROGEN COMPOUNDS
INDUSTRY
INORGANIC ACIDS
IRON ALLOYS
IRON BASE ALLOYS
IRON CHLORIDES
IRON COMPOUNDS
METALS
MONOCARBOXYLIC ACIDS
NICKEL
NICKEL ALLOYS
NITRIC ACID
NITROGEN
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PETROLEUM INDUSTRY
PHOSPHORIC ACID
SEAWATER
STAINLESS STEEL-316L
STAINLESS STEEL-329
STAINLESS STEEL-44LN
STAINLESS STEELS
STEELS
STRESS CORROSION
SULFIDES
SULFUR COMPOUNDS
SULFURIC ACID
TESTING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
USES
WATER
WELDABILITY