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. 10, 1998
Filed:
Jan. 09, 1997
Soon-Hyung Hong, Taejon, KR;
Young-Soo Han, Seoul, KR;
Korea Advanced Institute of Science and Technology, Taejon, KR;
Abstract
The present invention provides a Fe--Mn--Cr--Al cryogenic alloy having high ductility, strength, toughness and corrosion-resistance, and a process for preparing the same. The cryogenic structural alloy of the invention is prepared by the steps of: air-induced melting of a metallic alloy composition which consists of Fe 48.6 to 64.7 wt %, Mn 25.0 to 35.0 wt %, Cr 10.0 to 13.0 wt %, Al 0.1 to 2.0 wt %, C 0.1 to 0.4 wt % and Si 0.1 to 1.0 wt %; hot-rolling of the melted alloy at 1,090.degree. to 1,110 .degree. C.; and, solution heat treatment of the hot-rolled alloy at 1,040.degree. to 1,060.degree. C. for 50 to 70 minutes. A cryogenic structural alloy of the invention has corrosion-resistance similar to that of conventional 304 stainless steel, higher strength, elongation and toughness than 304 stainless steel, and much higher elongation, corrosion-resistance and toughness than 9% Ni steel; and, therefore, it can be applied for LNG-related facilities including storage tanks, transporting pipes and valves, and transport ships, etc.