New Developments in Martensitic Stainless Steels Containing C + N. Issue 12 (23rd February 2015)

• Record Type: Journal Article
• Authors: Seifert, M.; Siebert, S.; Huth, S.; Theisen, W.; Berns, H.
• Is Part Of: Steel research international. Volume 86:Issue 12(2015:Dec.)
• Page Start: 1508
• Page End: 1516
• Publication Date: 2015-02-23
• Subjects: martensitic stainless steels -- nitrogen -- alloy design -- ausforming; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.201400503
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract: The use of nitrogen in martensitic stainless steels is limited by its solubility. Nitrogen solubility can be increased by alloying with elements such as Cr, Mn, and Mo and the use of pressure, such as in Pressurized ElectroSlag Remelting (PESR). Furthermore, the joint addition of C + N increases their solubility. Solid‐state nitriding can be used for case hardening or N‐enrichment of steel powders before sintering. However, the resulting stabilization of austenite can be a drawback for martensitic steels. Besides cryogenic treatment below the martensite finish temperature, ausforming, that is, metal working above M s, could be promising. This contribution gives an overview about latest developments in N‐rich martensitic stainless steels. Abstract : This paper deals with alloying of martensitic stainless steels with nitrogen. It presents the research on thermodynamic analysis of dephosphorization process and establishment of the multi‐level recursive regression model for the prediction of end‐point phosphorus content during BOF steelmaking process. The verification with the data taken from three steel plants indicates that the hit rate of the model is above 84% when predictive errors of the model are within ±0.005%.