galvanized square steel tubes Material:Q195 Q235 St52 10# 20# ... :CE,BV,SGS,API Bright,Oiled, galvanized square steel tubes Specification:1. Outer diameter:15*15-400*400mm2. ... every pipeOuter:woven bag, wooden caseUsage:Mechanical & manufacture, Steel structure,Shipbuilding, BridgingMain market:Middle East, Africa, Asia ... 2247360Fax: 86-0315-2247325Skype:amandawang08 galvanized square steel tubes