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:
Aug. 24, 1976
Filed:
Apr. 08, 1974
Applicant:
Inventors:
Friedhelm Reinke, Remscheid, DT;
Hermann Voss, Remscheid, DT;
Herbert Geisel, Remscheid-Luttringhausen, DT;
Assignee:
AEG Elotherm G.m.b.H., Remscheid, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148127 ; 148 34 ;
Abstract
A method for producing a welded and quench hardened steel pipe and pipe whereby the weld seam running spirally or longitudinally along the pipe length has a lower austenization temperature than the pipe and/or a higher electrical resistance. The ratio of the pipe to seam resistance is preferably greater than one half and the whole of the square of the ratio between pipe wall thickness and mean seam thickness. The seam preferably includes amounts of C, Si, and Mn in the same percentage as the pipe plus nickel between 2-6%.