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42CrMo4 /34CrMo4/ 25CrMo4 Alloy Structural Steel Plate Item SPCC Grade T57 2.8/2.8 Tin Plate Sheet Material Grade SPCC, MR Temper(BA&CA) T1,T2,T3,T4,T5,DR8,DR9 Tin Coating 1.1~11.2g/m2 Thickness 0.15...