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1.Top diameter:80-200mm 2.Bottom diameter:200-400mm 3.Thickness:4mm 5mm 4.Material:Low alloy steel,yield strength not less than 345mpa(GB/T1591-2008standard) C≤0.20,Mn≤1.70,Si≤0.50,P≤0.50,S≤0.0345 5...