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Class Information
Number: 148/663
Name: Metal treatment > Process of modifying or maintaining internal physical structure (i.e., microstructure) or chemical properties of metal, process of reactive coating of metal and process of chemical-heat removing (e.g., flame-cutting, etc.) or burning of metal > Heating or cooling of solid metal > Iron(fe) or iron base alloy > Including cooling (e.g., quenching, etc.) > Heating step follows cooling > Tempering
Description: Process which includes a tempering heat treatment at any stage whereby a crystal structure such as martensite is transformed to carbides residing in austenite.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8691030 Low alloy steels with superior corrosion resistance for oil country tubular goods Apr. 8, 2014
8657972 Development of a high strength high toughness steel Feb. 25, 2014
8652396 Method and device for the continuous creation of a bainite structure in a carbon steel, particularly in a strip steel Feb. 18, 2014
8652273 High tensile steel for deep drawing and manufacturing method thereof and high-pressure container produced thereof Feb. 18, 2014
8647448 Nitratable steel piston rings and steel cylindrical sleeves, and casting method for the production thereof Feb. 11, 2014
8640341 Method of producing rolling sliding member Feb. 4, 2014
8636856 High strength steel having good toughness Jan. 28, 2014
8636859 Austempering heat treatment during hot isostatic pressing conditions Jan. 28, 2014
8524016 Method of making an austempered ductile iron article Sep. 3, 2013
8500924 High-strength steel plate and producing method therefor Aug. 6, 2013
8414715 Method of making ultra high strength steel having good toughness Apr. 9, 2013
8389127 Hot formed part, and method of making a hot formed part Mar. 5, 2013
8372219 Gun barrel of firearms Feb. 12, 2013
8372222 Method of producing locally austempered ductile iron Feb. 12, 2013
8328960 High strength bainitic steel for OCTG applications Dec. 11, 2012
8317943 Ball for constant velocity joint and method for producing the same Nov. 27, 2012
8313589 High-strength low-alloy steel excellent in high-pressure hydrogen environment embrittlement resistance characteristics and method for producing the same Nov. 20, 2012
8298353 Ultratough high-strength weldable plate steel and its method of manufacturing thereof Oct. 30, 2012
8216400 High-strength steel plate and producing method therefor Jul. 10, 2012
8192561 Method for manufacturing at least part of a device for an earthmoving or materials-handling machine using austempered ductile iron and its named product Jun. 5, 2012
8147626 Method for manufacturing high strength steel plate Apr. 3, 2012
8137483 Method of making a low cost, high strength, high toughness, martensitic steel Mar. 20, 2012
8066830 Method for producing a shaft for compressors Nov. 29, 2011
8066828 Method for efficient heat treatment of steel Nov. 29, 2011
8016954 Ultratough high-strength weldable plate steel and method of manufacture thereof Sep. 13, 2011
7972452 Method and device for the continuous creation of a bainite structure in a carbon steel, particularly in a strip steel Jul. 5, 2011
7931757 Seamless steel pipe for line pipe and a process for its manufacture Apr. 26, 2011
7918948 Method of production of 780 MPa class high strength steel plate excellent in low temperature toughness Apr. 5, 2011
7905968 Method of heat treating cultivating disc, coulter, and seed drill blades made from heat quenched boron steels, such that they can be roller re-edged and re-sharpened, and yet retain excellent Mar. 15, 2011
7905967 Method of manufacturing martensitic stainless steel Mar. 15, 2011
7896984 Method for manufacturing seamless steel pipe for line pipe Mar. 1, 2011
7857917 Method of production of steel for welded structures excellent in low temperature toughness of weld heat affected zone Dec. 28, 2010
7849599 Imputing strength gradient in pressure vessels Dec. 14, 2010
7799149 Oil country tubular good for expansion in well and manufacturing method thereof Sep. 21, 2010
7763124 Steel material with excellent rolling fatigue life and method of producing the same Jul. 27, 2010
7754031 Weldable steel building component and method for making same Jul. 13, 2010
7754032 Method for manufacturing a high speed tool steel Jul. 13, 2010
7704338 Method of manufacturing a martensitic stainless steel Apr. 27, 2010
7662247 Method of producing martensite wear-resistant cast steel with film austenite for enhancement of toughness Feb. 16, 2010
7655101 Steel alloy for cutting tools Feb. 2, 2010
7648597 Method for manufacturing high tensile strength steel plate Jan. 19, 2010
7625455 Method of heat treatment of stainless steel Dec. 1, 2009
7618503 Method for improving the performance of seam-welded joints using post-weld heat treatment Nov. 17, 2009
7611590 Wear resistant alloy for valve seat insert used in internal combustion engines Nov. 3, 2009
7563333 Process for producing steel article Jul. 21, 2009
7537727 Eglin steel--a low alloy high strength composition May. 26, 2009
7507307 Method for producing cold rolled steel plate of super high strength Mar. 24, 2009
7485197 Method for manufacturing martensitic stainless steel tube Feb. 3, 2009
7468109 High strength steel sheet having excellent stretch flangeability Dec. 23, 2008
7431781 Method for forming a common-rail injection system for diesel engine Oct. 7, 2008

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