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q235 astm seamless steel carbon pipes large diameter hot dip galvanized steel pipe for construction Reasonable Price Astm A106 Seamless Low Carbon Steel Pipe For Manufacturing Seamless Q195 Grade Galvanized Pipe 6m Length Hot Surface Technique API Certified ASTM EN Outer Material Special Product Origin ASTM A106 schedule 40 hot rolled seamless carbon steel tube pipes API 5L SCH80 SCH60 Steel Tube ASTM a106 Seamless Steel Pipe high precision seamless carbon steel pipe seamless galvanized steel pipe z120 z140 round steel tube High quality 3 inch hot dipped GI round steel tubing pre galvanized steel tube pipe