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GB6479 Seamless Steel Tubes for High-Pressure Chemical Fertilizer Equipments Material:10# 20# Q345B 12CrMo 15CrMo 12Cr2Mo 12Cr5Mo ASTM 1010/1020/179/192 st37/35.4/35.8/45-8 Size Range:OD:3-420mm WT:0...