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:
Jul. 09, 1991
Filed:
Oct. 30, 1989
Dieter Vespermann, Moers-Kapellen, DE;
Bernhard Hoffmann, Hunxe, DE;
Heinz Muller, Mlheim, DE;
Ingo Von Hagen, Krefeld, DE;
Mannesmann Aktiengesellschaft, Dusseldorf, DE;
Abstract
A process for the manufacture of a seamless pressure vessel and the seamless pressure vessel produced thereby, the process including the steps of employing an aluminum-killed CrMo steel which includes by wt. %: 0.28-0.39% C; 0.15-0.40% Si; 0.45-0.90% Mn; max. 0.02% P; max. 0.005% S; 0.90-1.30% Cr; 0.15-0.35% Mo; 0.0010-0.040% Ti; 0.001-0.003% B; and 0.003-0.010% N; hot working the alumninum-killed CrMo Steel to produce the seamless pressure vessel, austenizing the seamless pressure vessel at a temperature between about 830.degree. C. and about 880.degree. C.; cooling the seamless pressure vessel at a cooling rate of between about 5.degree. K/s and about 15.degree. K/s; and tempering the seamless pressure vessel at a temperature between about 510.degree. C. and about 660.degree. C.