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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11059102 B1

PDFFull Text
Date of Patent:
Jul. 13, 2021

Filed:

Mar. 15, 2017

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

Applicant:

Ksb SE & Co. Kgaa, Frankenthal, DE;

Inventors:

Alexander Boehm, Frankenthal, DE;

Stephan Braun, Frankenthal, DE;

Holger Rauner, Frankenthal, DE;

Bernd Schramm, Frankenthal, DE;

Adrian Stein, Frankenthal, DE;

Assignee:

KSB SE & Co. KGaA, Frankenthal, DE;

Attorney:

Crowell & Moring LLP

Primary Examiner:

Anthony J Zimmer

Assistant Examiner:

Dean Mazzola

Int. Cl.
CPC ...
B22F 10/20 (2021.01); B22F 3/24 (2006.01); C22C 33/02 (2006.01); C22C 38/04 (2006.01); C21D 6/00 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C22C 38/42 (2006.01); C21D 10/00 (2006.01); C21D 1/28 (2006.01); C22C 38/44 (2006.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01);
U.S. Cl.
CPC ...
B22F 10/20 (2021.01); B22F 3/24 (2013.01); C21D 1/28 (2013.01); C21D 6/00 (2013.01); C21D 6/004 (2013.01); C21D 10/00 (2013.01); C22C 33/02 (2013.01); C22C 33/0207 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); B22F 2003/248 (2013.01); B22F 2998/10 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01); Y02P 10/25 (2015.11);
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.

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