Method of enhancing intergranular corrosion resistance of a weld of the stainless duplex ferritic austenitic steel

摘要

A stainless duplex ferritic-austenitic steel with improved corrosion resistance in the as-welded condition consists essentially of about: 0.01 to 0.03 w/o carbon, 3.0 w/o Max. manganese, 1.0 w/o Max. silicon, 11.0 to 30.0 w/o chromium, 3.5 to 20 w/o nickel, 3.5 w/o Max. molybdenum, 2.0 w/o Max. copper, 0.005 w/o Max. boron, 0.10 to 0.35 w/o nitrogen and the balance essentially iron and contains at least about 17% austenite. The steel preferably contains about 0.17 to 0.35 w/o nitrogen for improved pitting resistance and for increased austenite content.