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:
Dec. 16, 2003
Filed:
Nov. 19, 2001
Lucien Coutu, London, GB;
Imphy Ugine Precision, Puteaux, FR;
Abstract
A maraging steel strip or part and process for manufacture of a strip or of a part cut out of a strip of cold-rolled maraging steel and hardened by a hardening heat treatment. In the process, before the hardening heat treatment is performed, the strip or the part is subjected to cold plastic deformation with a degree of working greater than 30% and the strip or the part is subjected to recrystallization annealing in order to obtain a fine-grained structure with ASTM index higher than 8. The composition by weight of the maraging steel is: 12%≦Ni≦24.5%; 2.5%≦Mo≦12%; 4.17%≦Co≦20%, Al %≦0.15%; Ti≦0.1%; N≦0.003%; Si≦0.1%; Mn≦0.1%; C≦0.005%; S≦0.001%; P≦0.005%; H≦0.0003%; O≦0.001%; iron and impurities resulting from smelting, the chemical composition also satisfying the relationships: 20%≦Ni+Mo≦27%; 50≦Co×Mo≦200; Ti×N≦2×10 .