公开(公告)号：US20250149215A1

公开(公告)日：2025-05-08

申请号：US18888241

申请日：2024-09-18

Applicant: The Swatch Group Research and Development Ltd

Inventor： Steve CLERC ,  Joël PORRET ,  Stewes BOURBAN

IPC: H01F3/00 ,  C21D1/18 ,  C21D6/00 ,  C22C38/40 ,  H01F1/00 ,  H01F41/02

Abstract: A paramagnetic stainless steel part including a core surrounded by a surface including at least a first zone and at least a second zone, the core and the second zone having a hardness HV1 of between 500 and 900, and a microstructure formed by a sigma phase at a mass percentage of between 40 and 80% and an austenitic phase at a mass percentage of between 20 and 60%, the part wherein the first zone is enriched in Ni relative to the core and the second zone, in that the first zone forms a layer entirely made up of an austenitic phase, the layer being referred to as the austenitic layer, and wherein the austenitic layer has a hardness of less than 400 HV1. Another aspect of the disclosure relates to the method for manufacturing this part.