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. 06, 1988
Filed:
Nov. 23, 1987
James R Spencer, Syare, PA (US);
De Wayne Grover, Towanda, PA (US);
GTE Products Corporation, Stamford, CT (US);
Abstract
A process is disclosed for producing a tungsten heavy alloy sheet which involves rolling a starting slab consisting essentially of tungsten heavy alloy wherein the tungsten content is from greater than 75% to 93% by weight tungsten by passing the slab one or more times through a rolling mill at a temperature of from 700.degree. C. to 900.degree. C. to reduce the height of the slab by no greater than 10% per pass to a total reduction in height of from 15% to 25%, heating the resulting slab from the first series at a temperature of 1000.degree. C. to 1200.degree. C. for a sufficient time to anneal the matrix of the slab, subjecting the resulting first time annealed slab to a second series of rolling operations by passing the first time annealed slab one or more times through a rolling mill at a temperature of 700.degree. C. to 900.degree. C. to reduce the height of the first time annealed slab by up to about 15% per pass until a total reduction in height of a maximum of about 45% from the height of the first series rolled slab is accomplished, and heating the resulting slab from the second rolling series at a temperature of 1000.degree. C. to 1200.degree. C. for a sufficient time to anneal the matrix of the slab. The second rolling series and the following anneals are done any number of times to produce the sheet. When the tungsten content is less than about 75% by weight, the rolling series can be done without annealing.