公开(公告)号：EP1311714A4

公开(公告)日：2005-07-27

申请号：EP01957421

申请日：2001-08-02

Applicant: ATI PROPERTIES INC

Inventor： GRUBB JOHN F ,  FRITZ JAMES D ,  POLINSKI RONALD E

IPC: C23F1/00 ,  C22C38/00 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C23F15/00 ,  C23G1/08 ,  C23G1/02 ,  C22C38/22 ,  C22C38/40

CPC classification number: C22C38/42 ,  C21D2261/00 ,  C22C38/001 ,  C22C38/44 ,  C23F15/00 ,  C23G1/086

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.

Abstract translation: 提高奥氏体钢的耐腐蚀性的方法包括从钢的表面的至少一部分去除材料，使得消除腐蚀开始位置或相对于以常规方式加工产生的数量而减少数量。 材料可以通过任何合适的方法从该部分中除去，包括在比同样钢的常规加工中使用的条件更具侵蚀性的条件下进行喷砂，研磨和/或酸洗。

公开(公告)号：EP1392873A4

公开(公告)日：2005-01-05

申请号：EP02725712

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 ,  C22C19/05 ,  C22C28/00

CPC classification number: F28F21/082 ,  C21D1/09 ,  C21D1/26 ,  C21D6/004 ,  C21D2221/00 ,  C22C38/001 ,  C22C38/44

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: PREN = Cr + (3.3 x Mo) + (30 x N), 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.