Austenitischer Edelstahl mit Verbesserter Wasserstoffversprödungsbeständigkeit und Tieftemperaturschlagzähigkeit und Verfahren zur Herstellung davon

Details

Veröffentlichungs-Nr.

EP4800148

Anmeldetag

5. Dezember 2024

Veröffentlichung

19. Juni 2025

Rechtsraum

EP

Abstract

The present disclosure provides an austenitic stainless steel and a method for manufacturing the same having excellent resistance to hydrogen embrittlement and cryogenic impact toughness, comprising, in weight percent (wt%): C: more than 0 to 0.05 wt% or less; Si: greater than 0 to 1.0 wt% or less; Mn: greater than 0 to 5.0 wt% or less; Cr: 16.0 to 25.0 wt%; Mo: greater than 0 to 2.5 wt% or less; Ni: 7.0 to 14.0 wt%; Cu: greater than 0 to 1.0 wt% or less; N: 0.05 to 0.28 wt%; and the balance of Fe and other inevitable impurities, wherein a following α value satisfies 30.0 or more, wherein an average delta ferrite area fraction in a region excluding a 1/4t region from a surface in a thickness direction is 3% or less, and wherein a density of delta ferrites having a major axis length of 50 µm or more is 0.04 pieces/cm² or less. α=Ni+0.65Cr+0.98Mo+1.05Mn+0.35Si+12.6C+33.6N≥30.0 (wherein Ni, Cr, Mo, Mn, Si, C, and N represent the content (wt%) of each element)

Anmelder

Firma

POSCO Co., Ltd

Land

🇰🇷 Südkorea