Hebei Hua Tuo Ka Yip Steel Trade Co., Ltd. 
 The Shijiazhuang companies the sales Hotline: Majing, 0311 -6,779,021,613,930,425,223 80,816,223 
 Fax :0311 -67,790,217 
 Web site: http:www.hbhtgt.net 
 1, square and rectangular pipe wall thickness tolerances, when the wall thickness of not more than 10mm shall not exceed the nominal wall thickness of plus or minus 10%, when the wall thickness greater than 10mm wall thickness plus or minus 8 percent, corners and welding The seam regional wall thickness except. 2, square and rectangular tube of the usual delivery length of 4000mm-12000mm, 6000mm and 12,000 majority. Rectangular tube to allow the delivery of not less than 2000mm of short and non-length product, the form of delivery can also be the interface tube, but the demand side, the interface should be used with tube removal. Weight of not more than 5% of the total deliveries in the short and non-length product, the theoretical weight greater than 20kg / m square and rectangular tube should not exceed 10% of the total deliveries, square and rectangular tube curvature per meter shall not be greater than 2mm, the total curvature not greater than 0.2% of the total length of 
 Implementation of standards 
 GB/T6728-2002, GB/T6725-2002, GBT3094-2000, JG 178-2005 ASTM A500 JIS G3466, EN10210 or technical agreement Application field: Widely used in machinery manufacturing, construction, metallurgical industry, agricultural vehicles, agricultural greenhouses , automobile, railway, highway guardrail, container frames, furniture, decoration and steel areas