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ASTM A252 A106 API 5L LSAW Welded Large Diameter 28 Inch Steel Pipe Piling Product name Welded carbon steel pipe Material Q195-A~Q275-A Q195B~Q275B 10# ~75# 16Mn,5MnV,09MnV 40Cr,30CrMnSi,45Mn2,40MnB, ...