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:
Feb. 09, 1982
Filed:
Jun. 02, 1980
Shinichi Murakami, Hirakata, JP;
Hisakatsu Nishihara, Hirakata, JP;
Arata Yoshimitsu, Hirakata, JP;
Sueyoshi Noji, Hirakata, JP;
Kubota Ltd., Osaka, JP;
Abstract
A method of refining the structure of the straight tube portions at the ends of an elbow made of cast stainless steel characterized in that a cast stock tube of a cast austenitic stainless steel with its chemical composition so adjusted as to have the ferrite phase mixed in in the proportion of 5-40% is formed, with the straight tube portions at its ends made larger or smaller than the specified dimension; the said straight tube portions are formed roughly to the specified dimensions by subjecting them to a plastic deformation either by a process of contraction or expansion, and thereafter, the tube thus formed is heated at 1,000.degree.-1,200.degree. C., and then, quenched.