In buildings, door and window frames are usually 6063 aluminum, roofing 

 and siding, alclad 3004 aluminum. Tread plate, such as used for decking and 

 catwalks, is 6061 aluminum heat treated to T4, T42, or T6 temper. Aluminum 

 alloys are also used for architectural trim, hardware, and gutters and 

 downspouts. Insulation is even faced with aluminum foil to reflect heat, 

 making the insulation more effective. 



Electrical wire and bus bars are either copper or 1350 aluminum. Because 

 the conductivity of 1350 aluminum is approximately one half that of copper, 

 the cross section of the aluminum conductor must be approximately twice that 

 of the copper for equivalent current capacity. The specific gravity of 

 aluminum is so much less than that of copper that equivalent conductors of 

 1350 aluminum weigh only half those of copper, making the choice one of 

 economics. Lamp poles and standards are made from 6063 aluminum. Even the 

 lamp bases may be 3004 or 5050 aluminum. 



Tanks and equipment for liquid natural gas facilities must be constructed 

 of materials having high notch toughness. Aluminum alloys 5083 and 5456 have 

 been specified for liquid natural gas storage tanks and vaporizers because 

 these alloys have good corrosion resistance to marine atmospheres and high 

 notch toughness. In accordance with ASTM A370, aluminum alloys do not 

 require Charpy impact testing because aluminum alloys do not become brittle 

 at cryogenic temperatures. 



(3) Copper . Electrical conductors such as wire and bus bars are the 

 largest applications of copper. Copper is also used for pipe and sheathing. 

 Coppers are used in many hidden applications in supporting equipment at 

 coastal structures. Such uses include radiators in air conditioners and 

 powered equipment, springs and contacts in communication and control systems, 

 and even tools of beryllium copper for use in areas where sparks must be 

 prevented to avoid fires and explosions. Copper alloys are used in equipment 

 such as heat exchangers, pumps, valves, and hardware for sluice gates and 

 traveling water screens. 



(4) N ickel . Nickel base alloys have good corrosion resistance to 

 seawater and generally high resistance to cavitation damage. Most resistant 

 are nickel -chromium-molybdenum columbium alloy 625 (Inconel 625, produced by 

 Huntington Alloys, Huntington, West Virginia) and nickel -molybdenum- chromium 

 alloy C (Hastelloy C, produced by Stellite Division, Cabot Corporation, Kokomo, 

 Indiana). These two alloys are used for springs, cable connectors, bellows- 

 type expansion joints, rupture disks, and pump seal rings in coastal facili- 

 ties. 



Nickel-copper alloy 400 (Monel 400, produced by Huntington Alloys) is the 

 lowest cost nickel base alloy for marine service. This alloy is used for 

 valve and pump trim, fasteners, heat exchangers, and piping. 



(5) Titanium . The major uses of titanium in coastal structures are 

 steam condensers employing seawater cooling, ball valves, and desalination 

 equipment. Titanium will tolerate polluted seawater under conditions where 

 other materials fail. As a result, many coastal powerplants are installing 

 steam condensers using titanium tubes. 



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