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:
Nov. 29, 2022
Filed:
Jul. 10, 2020
Kobe Steel, Ltd., Kobe, JP;
Hiroaki Hosoi, Kobe, JP;
Kobe Steel, Ltd., Kobe, JP;
Abstract
When a T1-tempered aluminum alloy extrusion is subjected to plastic working and thus formed into a product, crack occurrence is prevented during plastic working, and tensile residual stress of the product is reduced to improve stress corrosion cracking resistance. A T1-tempered 7000-series aluminum alloy extrusion is heated to a temperature range of 150° C. or higher, and then subjected to plastic working within the temperature range, and then cooled, and then subjected to artificial temper aging. An integral value (F) of (T(t)−140)is controlled to 5×10(° C.·s) or less in a section of t≤t≤t, where t is time (s) from heating start, T(t) is temperature (° C.) of the extrusion at time t, tis time before the extrusion reaches 140° C. in a heating step, and tis time before the extrusion reaches 140° C. again in a cooling step.