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High Pressure Seamless Boiler Steel Pipe/ Tube Standard: GB/T5310,ASTMA106GRC,ASTM A192,ASTM A210A1/C,ASTM A213,DIN17175,ASTMA335 Material: 20G, 15CrMoG,P91,1Cr5Mo Specification:76.2-508mm, Thickness: ...