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:
Sep. 16, 1997
Filed:
Dec. 08, 1995
Applicant:
Inventors:
Jacques Bellus, Scy-Chazelles, FR;
Claude Pichard, Malancourt, FR;
Pierre Jolly, Saint Etienne, FR;
Daniel Forest, Talange, FR;
Daniel Robat, Saint Julien les Metz, FR;
Assignee:
Ascometal, Puteaux, FR;
Primary Examiner:
Int. Cl.
CPC ...
C21D / ; C22C / ;
U.S. Cl.
CPC ...
148644 ; 148333 ; 148232 ; 148567 ; 148565 ;
Abstract
The invention relates to a method for fabricating a piece of structural steel that includes thermal or thermomechanical treatment steps that could ordinarily lower the fatigue strength and shock and impact resistance of the steel piece. In the method of the invention a workpiece of microalloy steel is fabricated containing the following elements in the mounts indicated and having a bainitic structure: