Alloys or metallic compositions – Ferrous – Nine percent or more chromium containing
Patent
1997-01-09
1998-11-10
Yee, Deborah
Alloys or metallic compositions
Ferrous
Nine percent or more chromium containing
420 74, 420583, 148608, 148620, 148542, C22C 3838, C21D 800
Patent
active
058339191
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.
REFERENCES:
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Han Young-Soo
Hong Soon-Hyung
Korea Advanced Institute of Science and Technology
Yee Deborah
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