... corrosion resistance 3.low thermal expansion rate 4.Wear-resist fire grate elementsThe materials of the grate bar include: Chemical ... (low alloy steel/ high chromium cast iron ),low-alloyed steel tube mould steel castings,engineering machinery steel castings,colliery/ mining/ building ... as per requirementsPackagingWooden case, crate, parcel, bale, package, barrel, etc. fire grate elements for boiler