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Class Information
Number: 148/590
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 > Pipe or tube
Description: Process wherein a hollow elongated cylinder (i.e., pipe or tube) is the metal undergoing treatment.

Sub-classes under this class:

Class Number Class Name Patents
148/592 Nine percent or more chromium(cr) (e.g., stainless steel, etc.) 60
148/591 Treating with specified agent (e.g., heat exchange agent, protective agent, decarburizing agent, denitriding agent, etc.) or vacuum 19
148/594 With work handling 30
148/593 With working 123

Patents under this class:
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Patent Number Title Of Patent Date Issued
8636856 High strength steel having good toughness Jan. 28, 2014
8608871 High-strength steel tube having excellent chemical conversion treatability and excellent formability and method for manufacturing the same Dec. 17, 2013
8585835 High-strength steel machined product and method for manufacturing the same, and method for manufacturing diesel engine fuel injection pipe and common rail Nov. 19, 2013
8496763 Seamless steel tube for an airbag accumulator and process for its manufacture Jul. 30, 2013
8479549 Method of producing cold-worked centrifugal cast tubular products Jul. 9, 2013
8414715 Method of making ultra high strength steel having good toughness Apr. 9, 2013
8366843 Method of manufacturing a martensitic stainless steel pipe Feb. 5, 2013
8328960 High strength bainitic steel for OCTG applications Dec. 11, 2012
8273195 High-strength steel tube and heat treatment method of heat-treating the same Sep. 25, 2012
8252129 Method for transforming steel blanks Aug. 28, 2012
8221562 Compact strip or thin slab processing of boron/titanium steels Jul. 17, 2012
8002910 Seamless steel tube which is intended to be used as a guide pipe and production method thereof Aug. 23, 2011
7942981 Rotationally symmetrical hollow body made of a deformable permanently magnetic alloy and its use and production process May. 17, 2011
7896983 Hollow stabilizer and method of manufacturing the same Mar. 1, 2011
7896984 Method for manufacturing seamless steel pipe for line pipe Mar. 1, 2011
7799149 Oil country tubular good for expansion in well and manufacturing method thereof Sep. 21, 2010
7736447 Steel plates for ultra-high-strength linepipes and ultra-high-strength linepipes having excellent low-temperature toughness and manufacturing methods thereof Jun. 15, 2010
7621323 Solid expandable tubular members formed from very low carbon steel and method Nov. 24, 2009
7559251 Apparatus for forming thermal fatigue cracks Jul. 14, 2009
7540402 Method for controlling weld metal microstructure using localized controlled cooling of seam-welded joints Jun. 2, 2009
7431781 Method for forming a common-rail injection system for diesel engine Oct. 7, 2008
7393420 Steel tube for bearing element parts and method of manufacturing as well as machining the same Jul. 1, 2008
7238434 Welded structure having improved resistance to stress corrosion cracking Jul. 3, 2007
7169239 Solid expandable tubular members formed from very low carbon steel and method Jan. 30, 2007
7060951 Apparatus for the clamping of a rotary tool in a tool holder Jun. 13, 2006
6948649 Method of producing steel pipes, and welded pipes Sep. 27, 2005
6887322 High pressure cylinders including backing steel with tool steel lining May. 3, 2005
6866725 Steel pipe excellent in formability and method of producing the same Mar. 15, 2005
6780261 Method of manufacturing an implantable stent having improved mechanical properties Aug. 24, 2004
6749894 Corrosion-resistant coatings for steel tubes Jun. 15, 2004
6749954 Welded steel pipe having excellent hydroformability and method for making the same Jun. 15, 2004
6723453 Welded steel pipe having excellent hydroformability and method for making the same Apr. 20, 2004
6682829 Welded steel pipe having excellent hydroformability and method for making the same Jan. 27, 2004
6682610 Manufacturing method for hollow stabilizer Jan. 27, 2004
6652680 Method for producing tubes for heavy guns Nov. 25, 2003
6632296 Steel pipe having high formability and method for producing the same Oct. 14, 2003
6589373 Selectively heat treated airbag canister and method for making same Jul. 8, 2003
6565682 Process for producing high-strength heat-resistant pipe May. 20, 2003
6475307 Method for fabricating vehicle components and new use of a precipitation hardenable martensitic stainless steel Nov. 5, 2002
6302974 Method and apparatus for straightening turbine casings Oct. 16, 2001
6270596 Process for producing high strength shaft Aug. 7, 2001
6261392 Method for manufacturing quenched thin-walled metal hollow casing by blow-moulding Jul. 17, 2001
6220306 Low carbon martensite stainless steel plate Apr. 24, 2001
6217676 Steel for oil well pipe with high corrosion resistance to wet carbon dioxide and seawater, and a seamless oil well pipe Apr. 17, 2001
6193820 Method for the thermal treatment of bushings, particularly for tracked vehicles and the like Feb. 27, 2001
6090230 Method of cooling a steel pipe Jul. 18, 2000
5730812 Method of manufacturing ejector pin sleeves Mar. 24, 1998
5605587 Apparatus for magnetic conditioning of liquids and methods of making same Feb. 25, 1997
5405459 Production process for producing hollow steel tube of high strength Apr. 11, 1995
5215829 Method for strengthening pressure resistance of a hollowed metallic structure and a pressure resistant structure made thereby Jun. 1, 1993

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