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    64.
    发明专利
    未知

    公开(公告)号：BR0213263A

    公开(公告)日：2004-10-26

    申请号：BR0213263

    申请日：2002-03-20

    Applicant: ATI PROPERTIES INC

    Inventor： BERGSTROM DAVID S ,  DUNN JOHN J ,  GRUBB JOHN F ,  PRATT WILLIAM A

    IPC: C22C38/00 ,  C22C38/42 ,  C22C38/44 ,  C22C38/54 ,  C22C38/58 ,  C21D9/00

    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 percent nickel, up to 3.75 percent manganese, 0.14 up to 0.35 percent nitrogen, up to 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.

    65.
    发明专利
    未知

    公开(公告)号：NO20034714L

    公开(公告)日：2003-12-22

    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

    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.

    Corrosion resistant austenitic stainless steel
    66.
    发明专利
    Corrosion resistant austenitic stainless steel 未知

    公开(公告)号：AU765419B2

    公开(公告)日：2003-09-18

    申请号：AU2179100

    申请日：1999-12-13

    Applicant: ATI PROPERTIES INC

    Inventor： SORACE DOMINIC A ,  GRUBB JOHN F

    IPC: C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/42 ,  C22C38/44 ,  C22C38/58 ,  H04L29/08 ,  C22C38/34

    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 lean 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 characteristics were found when hot working was carried out in the range of about 2100 DEG F. to about 2200 DEG F. Annealing in the range of about 1925 DEG F. to about 2025 DEG F. is preferred, as is rapid water quenching after annealing.

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