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. 23, 2016
Filed:
Aug. 26, 2011
Masanao Seo, Tokyo, JP;
Masanao Seo, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
In quenching, where a heated steel pipe () is immersed in a water bath () in parallel with water surface for cooling a pipe outer surface, and cooling water is injected from an axial center nozzle () into one end of pipe for cooling a pipe inner surface, thereby rapidly cooling the entire pipe surface, reduction of strength difference along a length of the quenched pipe becomes possible by moving the nozzle () following the motion of the pipe axis (), and starting injecting the water from the nozzle () so as for the water to reach the other pipe end at the time of the immersion of the entire circumference of the pipe outer surface. An opening () preferably faces the nozzle () to remove the water, and the flow velocity is preferably set to 23 m/sec or more for better water flow inside the pipe ().