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.:
Date of Patent:
Apr. 21, 2026
Filed:
Jul. 02, 2021
Danieli & C. Officine Meccaniche S.p.a., Buttrio, IT;
Gianpietro Benedetti, Tricesimo, IT;
Claudio Fabbro, Trieste, IT;
Maicol Cimolino, Martignacco, IT;
Simone Ferrarese, Trieste, IT;
DANIELI & C. OFFICINE MECCANICHE S.P.A., Buttrio, IT;
Abstract
A process comprising: rolling a steel billet via a roughing rolling mill and producing a steel bar; performing a first cooling stage so that the steel bar has a surface temperature higher than the martensite start temperature, and performing a first equalization stage in air; rolling the steel bar via an intermediate rolling mill; performing a second cooling stage always maintaining the surface temperature higher than the martensite start temperature, and performing a second equalization stage in air; rolling the steel bar via a finishing rolling mill in a non-recrystallization temperature range, maintaining the whole cross-section of the steel bar within said non-recrystallization temperature range, and with a total reduction between 25 and 50% with respect to the cross-section of the steel bar at the entry of the finishing rolling mill, in order to obtain an ultra-fine-grained austenitic matrix; winding the steel bar in a compact coil so that the ultra-fine-grained austenitic matrix transforms in a mixture of ferrite and pearlite.