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AssigneeThe United States of America as represented by the Secretary of Commerce
InventorsThomas A. Siewert, Christopher N. McCowan
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An alloy comprising nickel, chromium, molybdenum, manganese, nitrogen and iron in amounts such that a weld metal formed therefrom is austenitic, wherein nitrogen is present in a concentration of from about 0.1 to about 0.2% of the alloy in weight percent. The weld metals prepared from the alloys of the present invention possess superior properties as compared to other stainless steels. These properties include inter alia a superior tearing modulus, fracture toughness, and yield strength, even at cryogenic temperatures. The present invention further provides a method for welding a metal part which is intended for exposure to cryogenic temperatures comprising welding the metal part using a welding electrode comprising nickel, chromium, molybdenum, manganese, nitrogen and iron in amounts such that a weld metal formed therefrom is austenitic, wherein nitrogen is present in the electrode in a concentration of from about 0.1 to about 0.2% of the electrode in weight percent. Preferably, the welding comprises gas metal arc welding, wherein shielding gas used during welding contains no more than about 2% oxygen by volume.
An alloy comprising nickel at a concentration ranging from about 12% to about 20%, manganese at a concentration ranging from about 3% to about 7%, nitrogen at a concentration ranging from about 0.15% to about 0.2%, chromium at a concentration ranging from about 15% to about 25%, molybdenum at a concentration ranging from about 3% to about 10%, copper, and the balance being iron, wherein nickel, nitrogen, chromium, and molybdenum are present in effective amounts such that the alloy is austenitic, all in weight percentages of the alloy.
An alloy comprising chromium at a concentration ranging from about 12% to 19.4%, molybdenum at a concentration of 3%, nitrogen at a concentration ranging from about 0.15% to about 0.2%, nickel at a concentration ranging from about 20% to about 30%, manganese at a concentration ranging from about 5% to about 10%, copper, and the balance being iron, wherein nickel, nitrogen, chromium, and molybdenum are present in effective amounts such that the alloy is austenitic, all in weight percentages of the alloy.
A weld metal obtained by welding an alloy comprising nickel at a concentration ranging from about 12% to about 20%, manganese at a concentration ranging from about 3% to about 7%, nitrogen at a concentration ranging from about 0.15% to about 0.2%, chromium at a concentration ranging from about 15% to about 25%, molybdenum at a concentration ranging from about 3% to about 8%, copper, and the balance being iron, wherein nickel, nitrogen, chromium, and molybdenum are present in effective amounts such that the alloy is austenitic, all in weight percentages of the alloy.
A weld metal obtained by welding an alloy comprising chromium at a concentration ranging from about 12% to 19.4%, molybdenum at a concentration of 3%, nitrogen at a concentration ranging from about 0.15% to about 0.2%, nickel at a concentration ranging from about 20% to about 30%, manganese at a concentration ranging from about 5% to about 10%, copper, and the balance being iron, wherein nickel, nitrogen, chromium, and molybdenum are present in effective amounts such that the alloy is austenitic, all in weight percentages of the alloy.
Dependencies are inferred from the claim text.