Method for producing components from a duplex steel, and components produced using said method

US11059102B2 · kind B2 · utility

Assignee

• KSB SE & Co. KGaA · DE

Inventors

• Alexander Boehm · Dresden, DE
• Stephan Braun · Kehlhof, CH
• Holger Rauner · Bischofswerda, DE
• Bernd SCHRAMM · Bischofswerda, DE
• Adrian Stein · Bischofswerda, DE

Key dates

• Filing date: Mar 15, 2017
• Grant date: Jul 13, 2021
• Expiry date: Nov 12, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/25
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method for producing components from a duplex steel, and a component formed by the method, are provided. A powder-type duplex steel starting material including an austenitic phase and a ferritic phase is laser melted in successive layers to form a component. The melted and re-solidified component is then subjected to heat treatment to obtain solution annealing of the austenitic phase at a temperature range of between 850° C. and 1,100° C. for a predetermined dwell time, after which the component is cooled and the component has a grain size and grain size number G of at least 9 according to ASTM. The grain size and the grain size number G of the austenitic phase are influenced by the selection of the respective maximum temperature and/or the dwell time of the maximum temperature.