Japan, March 5 -- NIPPON STEEL STAINLESS STEEL CORP has got intellectual property rights for 'DUPLEX STAINLESS STEEL WITH HIGH RESISTANCE TO DISCOLORATION DUE TO CRUDE PHOSPHORIC ACID, AND STRUCTURE FOR CRUDE PHOSPHORIC ACID INCLUDING THE SAME.' Other related details are as follows:
Application Number: JP,2022-060918
Category (FI): C22C38/00,302@H,C22C38/58,C21D8/02@D,C21D8/021,C21D8/0221,C21D8/0247
Stage: PROBLEM TO BE SOLVED: To provide a duplex stainless steel that has economic superiority coupled with a degree of corrosion resistance, exhibiting high resistance to blackening due to crude phosphoric acid.SOLUTION: A duplex stainless steel includes a predetermined component, with the DI value represented by formula 1 being 300 or more, leading to the brightness L* of 65 or more, which can suppress the blackening to a non-discernible level. For example, the duplex stainless steel includes, as the main elements, C: 0.001-0.100%, Si: 0.05-1.50%, Mn: 0.10-2.00%, Cr: 23.0-30.0%, Ni: 4.00-10.00%, Mo: 0.50-3.00%, Cu: 0.01-3.00%, N: 0.10-0.25%, Ca: 0.0010-0.0100%, P: 0-0.050%, and S: 0-0.0040%, with the balance being Fe and inevitable impurities. (Formula 1) DI value=12Cr-Ni+30Mo+2Cu+10N.SELECTED DRAWING: None (Grant)
Filing Date: March 31, 2022
Publication Date: Oct. 16, 2023
The original document can be viewed at: https://www.j-platpat.inpit.go.jp/p0100
Disclaimer: Curated by HT Syndication.
