... .8~ 12mm 3) Spec.: Q195, Q215, Q235, 4) Standards: AST Fluid steel round pipegalvanized steel round piperound welded steel pipe/tubeWe ... caps.UsageScaffolding pipe, Structure pipe, Fence/Door pipe, Furniture, Lowpressure fluid pipe for water oil or gas, Boiler pipe.InspectionWith hydraulic ... .All production process are under the ISO9001:2000 strictly. Seamless Fluid Steel Pipe