Patent ID: 6454879
Filing Date: 2002-09-24
Classification: C21D,C22C

Abstract:
Austenitic, paramagnetic material with good corrosion resistance in media with high chloride concentrations, high yield strength, strength, and ductility, comprising (in wt-%):up to about 0.1 carbon; about 0.21 to about 0.6 silicon; greater than about 20 to less than about 30 manganese; greater than about 0.6 to less than about 1.4 nitrogen; about 17 to about 24 chromium; up to about 2.5 nickel; up to about 1.9 molybdenum; up to about 0.3 copper; a positive amount of up to about 0.002 boron; up to about 0.8 carbide-forming elements; the balance including iron; and substantially no ferrite content; wherein the material is hot-formed to a degree of deformation of at least about 3.5 times, actively cooled, and is cold-formed below the deposit temperature of nitrides, but at elevated temperature, the cold forming resulting in a deformation of about 5% to about 20%.