Cold-formed large-sized thick-walled rectangular pipe B490RNQ hot rolled steel and its mechanical properties at room temperature to fully meet and exceed the requirements of national standard Q345B, the forming properties comparable or superior to Q345B, the yield ratio to meet the national construction industry norms on earthquake requirements. While its temperature is superior to the same level of Q345B, 600 yield strength B490RNQ remained at 310MPa, much higher than the two-thirds of the yield strength at room temperature, and the process Q345B 500 above the yield strength of the wall thickness of 8mm is less than 2 / 3 room temperature yield strength. To reduce weight, improve the seismic impact safety performance, at home and abroad for wider use of high-strength steel, the ultimate strength of the material has reached 630MPa even higher. Large size thick-walled cold-formed square and rectangular steel pipe production process of rectangular tube, base metal tensile strength of up to 630Mpa, by product strength level out in the world, the highest intensity Nippon Steel Production Line only 550Mpa, plating zinc pipe, a difference of nearly 15%. Cold-formed large-sized thick-walled rectangular pipe B490RNQ hot rolled steel and its mechanical properties at room temperature to fully meet and exceed the requirements of national standard Q345B, the forming properties comparable or superior to Q345B, square tube price, the yield ratio to meet national building industry standards on seismic requirements. While its temperature is superior to the same level of Q345B, 600 yield strength B490RNQ remained at 310MPa, stainless steel pipe, much higher than the two-thirds of the yield strength at room temperature, and the process Q345B 500 above the yield strength of the wall thickness of 8mm has been less than two-thirds of the yield strength at room temperature. Also B490RNQ steel also has excellent corrosion resistance, Tianjin pipe, 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, a very good comprehensive benefits. Tianjin square tube, around the steel joint, galvanized square tube from the Tianjin Steel Trade Co., Ltd. Mastery. Tianjin square tube, around the steel joint, galvanized square steel pipe Tianjin Tongda Trade Co., Ltd. (www.tjtdgl.com) (www.tdglgt.com) this year introduced a new upgrade, the above picture is for reference only, please call Tel This page or image on to obtain the latest information, contact: Yanjing Li.