QUOTE(cyanide @ Apr 2 2010, 03:07 PM)
wrought iron is stronger and normally more expensive.
mild steel is those normal material, or ... shall i said just steel?
hollow meant its not solid, got hole in the middle.
I think judging by type of house is not really accurate. Better with per sq ft. even for intermediate DSL, the total area need the grille could be different if there's big windows vs small windows.
wrought Iron nowadays is just mildsteel that went extra hamemring to give its texture.. (how I know? cause I`m selling it maa)
carbon steel is divided into 3 types...
low, medium & high
we normally use low one... or term as mild steel or M.S
medium / high is used for shaft, gear etc very hard n heavy
the price of wrought iron depends on complexity of the design...
and the price also depends on what paint and how many coating they use....
I propose you ask all this detail