Duplexedelstahl und Nahtloses Edelstahlrohr

Details

Veröffentlichungs-Nr.

EP4711484

Anmeldetag

24. Juni 2024

Veröffentlichung

23. Januar 2025

Rechtsraum

EP

Abstract

An object of the present invention is to provide a duplex stainless steel and a stainless steel seamless pipe that have high strength, particularly, a yield strength of 448 MPa (65 ksi) or greater, and have excellent corrosion resistance and excellent low-temperature toughness. A duplex stainless steel having a chemical composition containing, in mass%, C: 0.002 to 0.03%, Si: 0.05 to 1.0%, Mn: 0.1 to 1.7%, P: 0.040% or less, S: 0.020% or less, Cr: 20.0 to 28.0%, Ni: 4.0 to 10.0%, Mo: 2.0 to 5.0%, Al: 0.001 to 0.05%, N: 0.06 to 0.35%, Sb: 0.001 to 1.000%, and O: 0.010% or less, with the balance being Fe and incidental impurities, wherein the duplex stainless steel includes microstructures containing an austenite phase in a volume fraction of 20 to 70% and a ferrite phase in a volume fraction of 30 to 80%, and the duplex stainless steel has a yield strength YS of 448 MPa or greater.

Anmelder

Firma

JFE Steel Corporation

Land

🇯🇵 Japan