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Q235 Q345 Q195 ST37 ST52 ST42 304 316 SS Anti-corrosion Steel Pipe Feature: Material: 45#, Q235, Q345, Q195, ST37, ST52, ST42, 10#-45#, Q195-Q345, ST35-ST52 Standard: API, ASTM, bs, DIN, GB, JIS, ASTM ...