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公开(公告)号：BR0209091A
公开(公告)日：2004-10-13
申请号：BR0209091
申请日：2002-04-18
Applicant: ATI PROPERTIES INC
Inventor： GRUBB JOHN F , FRITZ JAMES D
IPC: C22B9/16 , C21D1/09 , C21D1/26 , C21D1/34 , C21D6/00 , C21D8/00 , C22B9/18 , C22B9/20 , C22B9/22 , C22C38/00 , C22C38/44 , C22C38/58 , F28F21/08 , C21D9/00 , C22C28/00 , C22C19/05
Abstract: A method for producing a stainless steel with improved corrosion resistance includes homogenizing at least a portion of an article of a stainless steel including chromium, nickel, and molybdenum and having a PREN of at least 50, as calculated by the equation:where Cr is weight percent chromium, Mo is weight percent molybdenum, and N is weight percent nitrogen in the steel. In one form of the method, at least a portion of the article is remelted to homogenize the portion. In another form of the method, the article is annealed under conditions sufficient to homogenize at least a surface region of the article. The method of the invention enhances corrosion resistance of the stainless steel as reflected by the steel's critical crevice corrosion temperature.
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公开(公告)号：NO20042641L
公开(公告)日：2004-06-23
申请号：NO20042641
申请日：2004-06-23
Applicant: ATI PROPERTIES INC
Inventor： GRUBB JOHN F
IPC: C21D9/46 , C21D6/00 , C21D6/02 , C22C38/00 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/50 , H01M8/02 , H01M8/12
Abstract: The invention provides a method for making a ferritic stainless steel, the steel having a coefficient of thermal expansion within about 25 percent of the coefficient of thermal expansion of stabilized zirconia between 20°C (68°F) and 1000°C (1832°F), and at least one creep property selected from creep rupture strength of at least 1000 psi at 900°C (1652°F), time to 1% creep strain of at least 100 hours at 900°C (1652°F) under load of 1000 psi, and time to 2% creep strain of at least 200 hours at 900°C (1652°F) under load of 1000 psi, the method comprising providing a ferritic stainless steel comprising greater than 25 weight percent chromium, 0.75 to less than 1.5 weight percent molybdenum, up to 0.05 weight percent carbon, and at least one of niobium, titanium, and tantalum, wherein the sum of the weight percentages of niobium, titanium, and tantalum satisfies the equation 0.4 ‰¤ (%Nb + %Ti + ½(%Ta)) ‰¤ 1, and solution annealing the steel.
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公开(公告)号：NO20042201L
公开(公告)日：2004-05-27
申请号：NO20042201
申请日：2004-05-27
Applicant: ATI PROPERTIES INC
Inventor： GRUBB JOHN F , BERGSTROM DAVIS , DUNN JOHN J , PRATT WILLIAM A
Abstract: A duplex stainless steel includes less than, in weight percent, 3 percent nickel and 1.5 percent molybdenum. In one embodiment, the duplex stainless steel includes, in weight percent, up to 0.06 percent carbon, 15 to less than 19 percent chromium, 1 to less than 3 percent nickel, up to 3.75 percent manganese, greater than 0.12 up to 0.35 percent nitrogen, up to 2 percent silicon, up to 1.5 percent molybdenum, up to 0.5 percent copper, up to 0.2 percent cobalt, up to 0.05 percent phosphorus, up to 0.005 percent sulphur, up to 0.03 percent boron, iron and incidental impurities. The duplex stainless steel provided may be provided in the form of an article of manufacture, such as strip, bar, plate, sheet, casting, tubing and piping. A method for making the duplex stainless steel of the invention is also disclosed.
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公开(公告)号：BR0111076A
公开(公告)日：2004-01-13
申请号：BR0111076
申请日：2001-08-02
Applicant: ATI PROPERTIES INC
Inventor： GRUBB JOHN F , FRITZ JAMES D , POLINSKI ROANLD E
IPC: C23F1/00 , C22C38/00 , C22C38/18 , C22C38/42 , C22C38/44 , C23F15/00 , C23G1/08 , C23G1/02 , C22C38/22 , C22C38/40
Abstract: A method of enhancing the corrosion resistance of an austenitic steel includes removing material from at least a portion of a surface of the steel such that corrosion initiation sites are eliminated or are reduced in number relative to the number resulting from processing in a conventional manner. Material may be removed from the portion by any suitable method, including, for example, grit blasting, grinding and/or acid pickling under conditions more aggressive than those used in conventional processing of the same steel.
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公开(公告)号：NO20034714D0
公开(公告)日：2003-10-21
申请号：NO20034714
申请日：2003-10-21
Applicant: ATI PROPERTIES INC
Inventor： GRUBB JOHN F , FRITZ JAMES D
IPC: C22B9/16 , C21D1/09 , C21D1/26 , C21D1/34 , C21D6/00 , C21D8/00 , C22B9/18 , C22B9/20 , C22B9/22 , C22C38/00 , C22C38/44 , C22C38/58 , F28F21/08 , C21D
Abstract: A method for producing a stainless steel with improved corrosion resistance includes homogenizing at least a portion of an article of a stainless steel including chromium, nickel, and molybdenum and having a PREN of at least 50, as calculated by the equation:where Cr is weight percent chromium, Mo is weight percent molybdenum, and N is weight percent nitrogen in the steel. In one form of the method, at least a portion of the article is remelted to homogenize the portion. In another form of the method, the article is annealed under conditions sufficient to homogenize at least a surface region of the article. The method of the invention enhances corrosion resistance of the stainless steel as reflected by the steel's critical crevice corrosion temperature.
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Patent Agency Ranking
公开(公告)号：AU2002242314A2
公开(公告)日：2003-05-12
申请号：AU2002242314
申请日：2002-03-01
Applicant: ATI PROPERTIES INC
Inventor： GRUBB JOHN F , BERGSTROM DAVID S , PRATT WILLIAM A , DUNN JOHN J
Abstract: A duplex stainless steel includes less than, in weight percent, 3 percent nickel and 1.5 percent molybdenum. In one embodiment, the duplex stainless steel includes, in weight percent, up to 0.06 percent carbon, 15 to less than 19 percent chromium, 1 to less than 3 percent nickel, up to 3.75 percent manganese, greater than 0.12 up to 0.35 percent nitrogen, up to 2 percent silicon, up to 1.5 percent molybdenum, up to 0.5 percent copper, up to 0.2 percent cobalt, up to 0.05 percent phosphorus, up to 0.005 percent sulphur, up to 0.03 percent boron, iron and incidental impurities. The duplex stainless steel provided may be provided in the form of an article of manufacture, such as strip, bar, plate, sheet, casting, tubing and piping. A method for making the duplex stainless steel of the invention is also disclosed.
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公开(公告)号：CA2461966A1
公开(公告)日：2003-04-24
申请号：CA2461966
申请日：2002-03-20
Applicant: ATI PROPERTIES INC
Inventor： PRATT WILLIAM A , GRUBB JOHN F , DUNN JOHN J , BERGSTROM DAVID S
Abstract: A duplex stainless steel including, in weight percent, up to 0.06 percent carbon, 15 up to less than 25 percent chromium, greater than 3 up to 6 perce nt nickel, up to 3.75 percent manganese, 0.14 up to 0.35 percent nitrogen, up t o 2 percent silicon, greater than 1.4 up to less than 2.5 percent molybdenum, up to less than 0.5 percent copper, up to less than 0.2 percent cobalt, up to 0.05 percent phosphorous, up to 0.005 percent sulfur, and 0.001 up to 0.0035 percent boron, with the remainder being iron and incidental impurities is disclosed. The duplex stainless steel may be included in an article of manufacture, such as a strip, bar, plate, sheet, casting, tubing or piping. A method for making such a duplex stainless steel is also disclosed.
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公开(公告)号：CA2407591A1
公开(公告)日：2002-02-14
申请号：CA2407591
申请日：2001-08-02
Applicant: ATI PROPERTIES INC
Inventor： FRITZ JAMES D , POLINSKI RONALD E , GRUBB JOHN F
IPC: C23F1/00 , C22C38/00 , C22C38/18 , C22C38/42 , C22C38/44 , C23F15/00 , C23G1/08 , C23G1/02 , C22C38/22 , C22C38/40
Abstract: A method of enhancing the corrosion resistance of an austenitic steel includ es removing material from at least a portion of a surface of the steel such tha t corrosion initiation sites are eliminated or are reduced in number relative to the number resulting from processing in a conventional manner. Material may be removed from the portion by any suitable method, including, for example, gri t blasting, grinding and/or acid pickling under conditions more aggressive tha n those used in conventional processing of the same steel.
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公开(公告)号：CA2355109A1
公开(公告)日：2000-06-22
申请号：CA2355109
申请日：1999-12-13
Applicant: ATI PROPERTIES INC
Inventor： SORACE DOMINIC A , GRUBB JOHN F
Abstract: An alloy having a composition, by weight, of about 0.025 % or less carbon, about 0.5 to about 4.1 % manganese, about 5.5 to about 6.2 % silicon, about 11 to about 15 % chromium, about 9.0 to about 15.5 % nickel, about 0.8 to about 1.2 % molybdenum and about 0.8 to about 2 % copper and the remainder being essentially iron with incidental impurities. This composition results in lea n alloy content in a high silicon austenitic stainless steel for concentrated sulfuric acid service while maintaining a corrosion rate similar to and competitive with existing alloys for such service. Acceptable characteristic s were found when hot working was carried out in the range of about 2100 ~F to about 2200 ~F. Annealing in the range of about 1925 ~F to about 2025 ~F is preferred, as is rapid water quenching after annealing.
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