Also B490RNQ steel also has excellent corrosion resistance, so construction works have refractory weathering performance, application will save fireproof materials Cold forming thick-walled rectangular steel tube to a considerable extent. Even without having to indoor use of such steel roof truss member fire rust-proof paint process, which will reduce quantities, reduce project cost, table-side management on weight, but also give full play to the rectangular steel pipe visual appearance effect, have a good comprehensive benefits. Also B490RNQ steel also has excellent corrosion resistance, so construction works have refractory weathering performance, application will save fireproof materials Cold forming thick-walled rectangular steel tube to a considerable extent. Even without having to indoor use of such steel roof truss member fire rust-proof paint process, this project will reduce the amount of lower construction costs, but also give full play to the rectangular pipe shape beautiful visual effects, Chengdu square tube, have a good comprehensive benefits. Rectangular Pipe curvature per meter shall not be greater than 2mm, the total curvature is not greater than 0.2% of the total length. Rectangular Pipe curvature per meter shall not be greater than 2mm, the total curvature is not greater than 0.2% of the total length. Chengdu square tube, around the steel joint, seamless square tube from the Tianjin Steel Trade Co., Ltd. Mastery. Chengdu square tube, around the steel joint, seamless square tube is accessible Tianjin Steel Trade Co., Ltd. (www.tjtdgl.com) (www.tdglgt.com) this year introduced a new upgrade, the above picture is for reference only, please dial this Tel pages or pictures on obtain the latest information, contact: Yanjing Li.