... Combinations:Core TubeCarbon steels,low-alloy steels,stainless steels,brass,copper,coper-nickel alloys,aluminium bronze,nickel-alloys(Alloy 400,etc),bimetal,titanium and ... from an L shape and then wound around the base tube.The feet of the fins are joined together and ... desirable when using high value alloys(titanium,stainless,copper,nickel).The tube can withstand a temperature of up to 130°c ...