1)Product:carbon steel profile square pipe 2)WT:0.7mm-13mm 3)Material:Q195 ... HVAC, Plumbing, Fabrication industry, Food Processing, Pharmaceutical, Petrochemical, Chemical, Machine Building, Fencing, Railing greenhouse Fencing, fence framework. Contractors, engineers, ... St44, ST52JIS G3444 STK290,STK400,STK500,STK490,STK5405)Size:Square 15 mmx15mm-400 mmx400mmRetangle 10mm x 20mm-300mmx500mmRound 20mm- ...