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, stainless steel square tube, 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, 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, square tube prices, much higher than the yield strength at room temperature 2/3, Beijing square tube, and Q345B 500 technology on wall 8mm thick above the yield strength is less than 2/3 of the yield strength at room temperature. 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, a very good comprehensive benefits. The maximum thickness of rectangular tube of large-sized thick-walled cold-formed square and rectangular steel pipe production process up to 19mm, thick not only in absolute thickness, is also reflected in the relative thickness of the product. The thickness of the roll forming is an important indicator of difficulty, square tubes edge thickness ratio. At home and abroad generally believed, galvanized pipe, edge thickness ratio is less than 10:00 molding products with high difficulty. The production process of rectangular tube, the wall thickness of the product to its small section of a large edge thickness ratio of up to 7, such as 100mm * 100mm * 14mm, 120mm * 120mm * 16mm and so on. Mastery Beijing square tube steel joint _ _ galvanized square tube from the Tianjin Steel Trade Co., Ltd. Mastery. Mastery Beijing square tube 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.