logo

For the Inventor, By the Inventor

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 12398449 B1

PDFFull Text
Date of Patent:
Aug. 26, 2025

Filed:

Jan. 09, 2024

Duplex stainless steel and formed object thereof

Applicant:

Alleima Tube Ab, Sandviken, SE;

Inventors:

Daniel Gullberg, Gavle, SE;

Christina Haraldsson, Sandviken, SE;

Anders Wilson, Gavle, SE;

Alexander Scheerder, Sittard, NL;

Kirk Ofei, Sittard, NL;

Assignee:

Alleima Tube AB, Sandviken, SE;

Attorney:

Morgan, Lewis & Bockius LLP

Primary Examiner:

Katherine A Christy

Int. Cl.
CPC ...
C22C 38/00 (2006.01); B01D 3/32 (2006.01); B01J 19/02 (2006.01); C07C 273/04 (2006.01); C21D 6/00 (2006.01); C21D 8/00 (2006.01); C21D 9/08 (2006.01); C22C 33/02 (2006.01); C22C 33/04 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/58 (2006.01); F28F 21/08 (2006.01); B22F 3/15 (2006.01); C21D 8/10 (2006.01);
U.S. Cl.
CPC ...
C22C 38/44 (2013.01); B01D 3/32 (2013.01); B01J 19/02 (2013.01); C07C 273/04 (2013.01); C21D 6/004 (2013.01); C21D 8/005 (2013.01); C21D 9/08 (2013.01); C22C 33/0285 (2013.01); C22C 33/04 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); C22C 38/58 (2013.01); F28F 21/083 (2013.01); B01J 2219/0286 (2013.01); B22F 3/15 (2013.01); C21D 8/105 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01); Y02P 10/122 (2015.11);
Abstract

A corrosion resistant duplex stainless steel (ferritic austenitic alloy) is suitable for use in a plant for the production of urea. Uses of the corrosion resistant duplex stainless steel include in objects made of said duplex stainless steel, in methods for the production of urea, in a plant for the production of urea comprising one or more parts made from said duplex stainless steel, and in methods of modifying an existing plant for the production of urea. In one aspect, the composition consists of in weight % (wt %): C 0.010 to 0.015; S 0.08 to 0.23; Mn 1.0 to 1.05; Cr 29.07 to 29.92; Ni 5.76 to 7.17; Mo 3.0 to 4.0; W max 2.55; N 0.3 to 0.35; Cu max 0.01; S max 0.008; P max 0.008; at least one of Ti, Nb, Hf, Ca, Ba, V, and B max 0.5 total; balance Fe and unavoidable occurring impurities.

Find Patent Forward Citations

Loading…