Quantification of the Post-Fire Strength Retention Factors for Selected Standard Duplex and Lean Duplex Stainless Steel Grades

Author:

Maslak Mariusz1ORCID,Pancikiewicz Krzysztof2ORCID,Pazdanowski Michal1ORCID,Stankiewicz Marek1,Wozniczka Piotr1,Zajdel Paulina1ORCID

Affiliation:

1. Faculty of Civil Engineering, Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland

2. Faculty of Metals Engineering and Industrial Computer Science, The AGH University of Cracow, Pavilion A-2, Mickiewicza 30, 30-059 Cracow, Poland

Abstract

The experimental quantification of retention factors related to the post-fire strength as well as the post-fire ductility of intentionally selected stainless steel grades applied in construction is the objective of the research presented here. These steel grades are characterized by a two-phase austenitic–ferritic microstructure of the duplex type. In this context, two mutually corresponding chromium–nickel–molybdenum steel grades are subjected to analysis, namely X2CrNiMoN22-5-3 steel belonging to the standard duplex group (DSS 22% Cr) and X2CrMnNiN21-5-1 steel belonging to the lean duplex group (LDSS). The similarities and differences in the mechanical properties exhibited by these steel grades after effective cooling, following more or less prolonged simulated fire action conforming to several development scenarios, are identified and indicated. The resistance of a given steel grade to permanent structural changes induced by the heating program proved to be the critical factor determining these properties and resulting in many cases in increased susceptibility to brittle fracture. The results obtained experimentally seem to confirm the quantitative estimates of post-fire retention factors forecast by Molkens and his team, specified for the steels exhibiting a duplex-type structure and tested by us. However, several of these estimates might be considered somewhat risky. Nevertheless, our results do not confirm the significant post-fire strengthening of steel grades belonging to the LDSS group following prior heating at a sufficiently high temperature, as reported earlier by Huang Yuner and B. Young.

Publisher

MDPI AG

Reference37 articles.

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2. (2009). Practical Guidelines for the Fabrication of Duplex Stainless Steel, International Molybdenum Association (IMOA). [2nd ed.].

3. Fritz, J. (2020). Practical Guide to Using Duplex Stainless Steels. A Guide to the Use of Nickel-Containing Alloys No 10044, Nickel Institute. Available online: www.nickelinstitute.org.

4. (2017). Design Manual for Structural Stainless Steel, SCI. [4th ed.]. Available online: www.steel-sci.com.

5. Maslak, M., Stankiewicz, M., and Slazak, B. (2021). Duplex steels used in building structures and their resistance to chloride corrosion. Materials, 14.

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