C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/30.5
C21D 8/00 (2006.01) C21D 6/00 (2006.01) C22C 38/00 (2006.01)
Patent
CA 1232516
Abstract of the Disclosure The present invention relates to the utilization of a corrosion proof austenitic iron-chromium-nickel-nitrogen alloy as structural material for components being subjected to high mechanical loads and being well amenable to welding. Thus the invention provides a method of making and using weldments of a corrosion proof austenitic alloy comprising the step of providing an alloy having the following composition not more than 0.08% carbon, from 0.065 to 0.35% nitrogen; of not more than 0.75% niobium but not more than the 4-fold amount of nitrogen used in the alloy, from 16.0 to 22.5% chromium, from 7.0 to 55.0% nickel, not more than 4.75% manganese, not more than 6.5% molybdenum, not more than 3.0% silicon, not more than 4% copper, not more than 0.008 boron, the remainder being iron and unavoidable impurities; and cold working and recrystallization annealing of said alloy to attain an ultrafine grained structure with an average linear intercept length of grains below 10 micrometers and therefore obtaining increased 0.2% offset yield strength at room and elevated temperatures; and joining of said alloy in its grain-refined state through welding using a high strength, nitrogen containing, corrosion resistant steel or nickel alloy as filler metal and the ultrafine grained alloy as parent metal, which will in spite of its very small grains not fracture in the seam transition region of the weldments.
474916
Fetherstonhaugh & Co.
Mannesmann Aktiengesellschaft
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