10 Years
Round Seamless Special Steel Pipe Ribbed Tubes Polishing OD 5-420mm Standard: GB/T 20409 Material: 20G, SA-210A1 , SA210C, SA213 T2, SA213 T12 , 12CrMoG, 15CrMoG Sizes: OD: 5-420mm WT: 0.5-50 mm ...
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