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2mm 5mm 6mm 10mm 20mm Carbon Steel Plates Material (1) Carbon structural steel: Q235, Q255, Q275, SS400, A36, SM400A, St37-2, SA283Gr, S235JR, S235J0, S235J2 (2) 10-50#,20Mn,50Mn,1025 (3) Low-alloy ...