The best replacement for aluminum is steel.

The best alternatives to aluminum are rated as following:

★★★★★	steel
★★★★★	aluminium
★★★★	stainless steel
★★★	vinyl windows
★★★	vinyl siding
★★	carbon arrows
★★	fiberglass ladder
★	wood bats
★	carbon fiber
★	steel bike
★	copper wiring
★	titanium
★	fiberglass boat
★	steel weight
★	copper wire
★	steel strength
★	copper
★	steel wheels
★	composite bats
★	stainless steel cookware
★	copper heatsink
★	stainless steel water bottles
★	fiberglass ladders
★	fiberglass boats
	copper radiator
	stainless steel pots
	alloy wheels
	steel bike frame
	steel flywheel
	vinyl gutters
	carbon road bike
	copper transformer windings
	titanium bicycle
	wood windows
	magnesium
	steel cookware
	fiberglass canoe
	steel water bottle
	magnesium anode
	tin gifts
	stainless steel water bottle
	plastic
	stainless steel pressure cooker
	carbon bike frames
	stainless steel brewing
	steel cost
	fiberglass
	composite bat
	fiberglass windows
	anodized cookware
	brass casing
	tin
	steel bike frames
	steel trailer
	steel fence
	copper conductors
	stainless steel exhaust
	steel rims
	fiberglass screen
	stainless steel bottles
	steel gutters
	galvanized trailer
	carbon bikes
	wooden bats
	stainless cookware
	fiberglass travel trailer
	wood bat
	steel frame
	carbon frame
	vinyl
	carbon bike
	carbon bicycles

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Speaking about aluminum, one probably shouldn't forget about hydrochloric acid.

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aluminum

steel

aluminium