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Class Information
Number: 420/56
Name: Alloys or metallic compositions > Ferrous (i.e., iron base) > Nine percent or more chromium containing > Eight percent or more total nickel plus manganese containing
Description: Alloy or metallic composition which additionally contains a total quantity of nickel plus manganese of 8 percent or more.










Sub-classes under this class:

Class Number Class Name Patents
420/58 Copper containing 43
420/57 Molybdenum or tungsten containing 88
420/59 Over 0.20 percent nitrogen containing 63


Patents under this class:
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Patent Number Title Of Patent Date Issued
8486204 Hinge device and electronic device using the same Jul. 16, 2013
8337748 Lean austenitic stainless steel containing stabilizing elements Dec. 25, 2012
8337749 Lean austenitic stainless steel Dec. 25, 2012
8192682 High strength alloys Jun. 5, 2012
8133431 Austenitic stainless steel Mar. 13, 2012
7749431 Stainless steel for high-pressure hydrogen gas Jul. 6, 2010
7682471 Austenitic iron-based alloy Mar. 23, 2010
7455811 Brazing material and brazed products manufactured therewith Nov. 25, 2008
7381369 Free cutting alloy Jun. 3, 2008
7335428 Cooking vessel comprising a base made of a multilayer material and a side wall, and article of multilayer material Feb. 26, 2008
6893727 Metal gasket and a material for its manufacture and a method for their manufacture May. 17, 2005
6824672 Use of austenitic stainless steels in applications requiring anti-coking properties Nov. 30, 2004
6761777 High chromium nitrogen bearing castable alloy Jul. 13, 2004
6454879 Process for producing a paramagnetic, corrosion-resistant material and like materials with high yield strength, strength, and ductility Sep. 24, 2002
6361740 Suspension arm and load beam for a disk drive Mar. 26, 2002
6290905 Welding material Sep. 18, 2001
6159310 Wire for welding high-chromium steel Dec. 12, 2000
5643530 Non-magnetic high manganese cast product Jul. 1, 1997
5614149 Stainless steels for coins and method of producing coins of stainless steel Mar. 25, 1997
5514329 Cavitation resistant fluid impellers and method for making same May. 7, 1996
5496514 Stainless steel sheet and method for producing thereof Mar. 5, 1996
5173131 Shape memory stainless alloy Dec. 22, 1992
5098652 Precision parts of non-magnetic stainless steels Mar. 24, 1992
5096664 Alloys having excellent erosion resistance and stress corrosion cracking resistance Mar. 17, 1992
5041174 Insert for the connection of a manganese steel part to a carbon steel part Aug. 20, 1991
5019332 Heat, corrosion, and wear resistant steel alloy May. 28, 1991
4966636 Two-phase high damping capacity F3-Mn-Al-C based alloy Oct. 30, 1990
4946644 Austenitic stainless steel with improved castability Aug. 7, 1990
4929419 Heat, corrosion, and wear resistant steel alloy and article May. 29, 1990
4929416 Cast steel May. 29, 1990
4892704 Low Si high-temperature strength steel tube with improved ductility and toughness Jan. 9, 1990
4882124 Alloys having excellent erosion resistance Nov. 21, 1989
4863682 Austenitic stainless steel alloy Sep. 5, 1989
4851059 Non-magnetic high hardness austenitic stainless steel Jul. 25, 1989
4828630 Duplex stainless steel with high manganese May. 9, 1989
4814140 Galling resistant austenitic stainless steel alloy Mar. 21, 1989
4798634 Corrosion resistant wrought stainless steel alloys having intermediate strength and good machinability Jan. 17, 1989
4778651 Austenitic stainless steel, particularly usable as a core structural or canning material in nuclear reactors Oct. 18, 1988
4751046 Austenitic stainless steel with high cavitation erosion resistance Jun. 14, 1988
H326 Mn-Fe base and Mn-Cr-Fe base austenitic alloys Sep. 1, 1987
4675156 Structural austenitic stainless steel with superior proof stress and toughness at cryogenic temperatures Jun. 23, 1987
4640817 Dual-phase stainless steel with improved resistance to corrosion by nitric acid Feb. 3, 1987
4610437 Crucible for holding salt baths for the boriding of steels Sep. 9, 1986
4609577 Method of producing weld overlay of austenitic stainless steel Sep. 2, 1986
4586957 Iron-base alloy materials having excellent workability May. 6, 1986
4585479 Welding material of ferrite-austenite two-phase stainless steel and method of application Apr. 29, 1986
4533391 Work-hardenable substantially austenitic stainless steel and method Aug. 6, 1985
4530720 High temperature oxidation resistant austenitic steel Jul. 23, 1985
4499158 Welded structural member having high erosion resistance Feb. 12, 1985
4484958 Non-magnetic alloy having high hardness and good weldability Nov. 27, 1984

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