US2004081576A1PendingUtilityA1

Titanium-added, high strength steel

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Assignee: SANYO SPECIAL STEEL CO LTDPriority: Oct 25, 2002Filed: Nov 12, 2002Published: Apr 29, 2004
Est. expiryOct 25, 2022(expired)· nominal 20-yr term from priority
Inventors:Kazuhiko HiraokaShuhei Kitano
C22C 38/02C22C 38/001C22C 38/002C22C 38/04C22C 38/22C22C 38/28C22C 38/44C22C 38/50
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Claims

Abstract

Disclosed is a titanium(Ti)-added steel wherein the formation of TiN or nitrogen-rich TiCN, which is found in a conventional titanium-added steel for machine construction and adversely affects the properties of the titanium-added steel for machine construction, has been suppressed, particularly a titanium-added, high strength steel wherein various properties can be stably exhibited and Ti(C)N has been regulated. This titanium-added, high strength steel is a steel for machine construction, which comprises, as steel constituents, by weight, titanium: not less than 500 ppm, the content of nitrogen (N) being N<100 ppm and has excellent fatigue limit as shown in FIG. 1.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A titanium(Ti)-added, high strength steel as a steel for machine construction, comprising, by weight, titanium: not less than 500 ppm, the content of nitrogen (N) being N<100 ppm.  
     
     
         2 . A titanium(Ti)-added, high strength steel as a steel for machine construction, comprising, by weight, titanium: not less than 500 ppm, the maximum size of TiN and/or TiCN crystallized in the steel, {square root}{square root over (area max)}, being not more than 80 μm as predicted in a measurement area of 30000 mm 2  by an extreme value statistical method.  
     
     
         3 . A titanium(Ti)-added, high strength steel as a steel for machine construction, comprising, by weight, titanium: not less than 500 ppm, the content of nitrogen (N) being N<100 ppm, the maximum size of TiN and/or TiCN crystallized in the steel, {square root}{square root over (area max)}, being not more than 80 μm as predicted in a measurement area of 30000 mm 2  by an extreme value statistical method.  
     
     
         4 . The titanium-added, high strength steel according to any one of  claims 1  to  3 , which is a steel based on a steel selected from the group consisting of SC steel (JIS (Japanese Industrial Standards) G 4051 (1979)), SMn steel (JIS G 4106 (1979)), SCr steel (JIS G 4104 (1979)), SCM steel (JIS G 4105 (1979)), SNC steel (JIS G 4102 (1979)), SNCM steel (JIS G 4103 (1979)), and SUJ steel (JIS G 4805 (1999)) and further comprising titanium and nitrogen and optionally minor elements with the balance comprising unavoidable impurities.

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