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Class Information
Number: 420/34
Name: Alloys or metallic compositions > Ferrous (i.e., iron base) > Nine percent or more chromium containing
Description: Alloy or metallic composition which additionally contains 9 percent or more of chromium.

Sub-classes under this class:

Class Number Class Name Patents
420/65 0.25 percent or more nitrogen containing 37
420/64 Boron containing 66
420/36 Cobalt containing 41
420/60 Copper containing 71
420/43 Eight percent or more nickel containing 94
420/56 Eight percent or more total nickel plus manganese containing 72
420/70 Group iv or v transition metal containing 92
420/41 Lead, bismuth, antimony, calcium, selenium or tellurium containing 72
420/67 Molybdenum or tungsten containing 97
420/35 Noble metal containing 26
420/42 Over 0.05 percent sulfur, over 0.04 percent phosphorus or sulfur or phosphorus added in any amount to promote machinability 82
420/62 Over 0.1 percent aluminum containing 64
420/71 Processes 35
420/40 Rare earth containing 129

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8673402 Spray clad wear plate Mar. 18, 2014
8663403 High corrosion resistance precipitation hardened martensitic stainless steel Mar. 4, 2014
8500923 High aluminum ferritic stainless steel sheet for weight sensor substrate, method for producing the same and weight sensor Aug. 6, 2013
8357328 Methods for processing nanostructured ferritic alloys, and articles produced thereby Jan. 22, 2013
8357247 Martensitic stainless steel for disk brakes Jan. 22, 2013
8303168 Device and a method of manufacturing a housing material Nov. 6, 2012
8287403 Iron-based alloy for a golf club head Oct. 16, 2012
8262815 High-purity ferritic stainless steel with excellent corrosion resistance and workability and method of production of same Sep. 11, 2012
8202375 Temperature-stable cast iron alloy and use of said alloy Jun. 19, 2012
8158057 Interconnects for solid oxide fuel cells and ferritic stainless steels adapted for use with solid oxide fuel cells Apr. 17, 2012
8157930 Martensitic stainless steel Apr. 17, 2012
8062584 Ferritic stainless steel sheet superior in heat resistance Nov. 22, 2011
7985306 High corrosion resistance precipitation hardened martensitic stainless steel Jul. 26, 2011
7875128 Method for manufacturing a stainless steel product and a stainless steel product manufactured by the method Jan. 25, 2011
7799147 Flaky soft magnetic metal powder and magnetic core member for RFID antenna Sep. 21, 2010
7758968 Component with thermal barrier coating and erosion-resistant layer Jul. 20, 2010
7744813 Oxidation resistant high creep strength austenitic stainless steel Jun. 29, 2010
7686897 Martensitic stainless steel seamless pipe and a manufacturing method thereof Mar. 30, 2010
7682559 Cr-bearing heat-resistant steel sheet excellent in workability and method for production thereof Mar. 23, 2010
7601230 Medical devices Oct. 13, 2009
7597797 System and method for on-line spalling of a coker Oct. 6, 2009
7429302 Stainless steel sheet for welded structural components and method for making the same Sep. 30, 2008
7392930 Iron-based braze filler metal for high-temperature applications Jul. 1, 2008
7390456 Powder-metallurgic method for producing highly dense shaped parts Jun. 24, 2008
7341637 Ferritic stainless steel sheet excellent in press formability and workability and method for production thereof Mar. 11, 2008
7294212 High-strength stainless steel material in the form of a wheel rim and method for manufacturing the same Nov. 13, 2007
7267730 Ferrite stainless steel for automobile exhaust system member superior in thermal fatigue strength Sep. 11, 2007
6974506 Method of manufacturing a ferritic-martensitic, Oxide Dispersion Strengthened alloy Dec. 13, 2005
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
6776928 Conductive coating composition Aug. 17, 2004
6733694 Electric resistance material May. 11, 2004
6673165 High-hardness martensitic stainless steel excellent in corrosion resistance Jan. 6, 2004
6645318 Fuel tank made of ferritic stainless steel Nov. 11, 2003
6623569 Duplex stainless steels Sep. 23, 2003
6599376 FE-CR soft magnetic material and a method of manufacturing thereof Jul. 29, 2003
6582652 Stainless steel alloy having lowered nickel-chromium toxicity and improved biocompatibility Jun. 24, 2003
6562293 Material formulation for galvanizing equipment submerged in molten aluminum and aluminum/zinc melts May. 13, 2003
6464802 High Cr steel pipe for line pipe Oct. 15, 2002
6427759 Investment cast stainless steel marine propeller Aug. 6, 2002
6426038 Universal alloy steel Jul. 30, 2002
6379821 Martensitic stainless steel welded pipe Apr. 30, 2002
6355212 Alloy for corrosion-resistant coatings or surface coatings Mar. 12, 2002
6334977 Powder material for powder plasma overlaying and powder plasma overlaying metal Jan. 1, 2002
6332934 Martensitic stainless steel for seamless steel pipe Dec. 25, 2001
6299704 Heat resisting steel containing a ferrite or tempered martensite structure Oct. 9, 2001
6274084 Corrosion-resistant low-nickel austenitic stainless steel Aug. 14, 2001
6224687 Piston ring material and piston ring with excellent scuffing resistance and workability May. 1, 2001
6207103 Fe-Cr-Si steel sheets having excellent corrosion resistance and method for manufacturing the same Mar. 27, 2001
6187147 Delayed coker unit furnace Feb. 13, 2001

1 2 3

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