Method for manufacturing a martensitic stainless steel part from a sheet

US11001916B2 · kind B2 · utility

Assignee

• APERAM · LU

Inventors

• Pierre-Olivier Santacreu · Lillers, FR
• Christophe CAZES · Versailles, FR
• Guillaume Badinier · Lille, FR
• Jean-Benoît Moreau · Lille, FR

Key dates

• Filing date: Mar 21, 2017
• Grant date: May 11, 2021
• Expiry date: Oct 26, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2211/008
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method for manufacturing a martensitic stainless steel part, according to which a stainless steel sheet is prepared with the following composition: 0.005%≤C≤0.3%; 0.2%≤Mn≤2.0%; traces≤Si≤1.0%; traces≤S≤0.01%; traces≤P≤0.04%; 10.5%≤Cr≤17.0%; traces≤Ni≤4.0%; traces≤Mo≤2.0%; Mo+2×W≤2.0%; traces≤Cu≤3%; traces≤Ti≤0.5%; traces≤Al≤0.2%; traces≤O≤0.04%; 0.05%≤Nb≤1.0%; 0.05%≤Nb+Ta≤1.0%; 0.25%≤(Nb+Ta)/(C+N)≤8; traces≤V≤0.3%; traces≤Co≤0.5%; traces≤Cu+Ni+Co≤5.0%; traces≤Sn≤0.05%; traces≤B≤0.1%; traces≤Zr≤0.5%; Ti+V+Zr≤0.5%; traces≤H≤5 ppm; traces≤N≤0.2%; (Mn+Ni)≥(Cr−10.3−80×[(C+N)2]); traces≤Ca≤0.002%; traces≤rare earth and/or Y≤0.06%; and the rest being iron and impurities.