Channel belongs constructed of carbon steel and machinery, is a complex cross-section steel beam, its cross-sectional shape of the groove. Channel is mainly used for building construction and vehicle manufacturing. In use, is required to have good welding, riveting performance and mechanical properties. Channel steel billets for production of raw carbon content of not more than 0.25% of carbon steel or low alloy steel billets. Finished channel formed by thermal processing, normalizing or hot-rolled state delivery. Channel to channel groove-shaped steel bar. Representation of its specifications, such as 120 * 53 * 5, indicating that the high waist of 120 mm, a height of 53 mm legs, waist thickness of 5 mm channel, known as the 12 # channel. waist high the same channel, if several different legs wide and thick waist, plus the model on the right abc be distinguished, such as 25a # 25b # 25c #, the common market for a type and b-type. The main channel for building structure, vehicle manufacturers and other steel structures, channels also often used in conjunction with the I-beam. In accordance with the theory of steel structures, it should be channel wing force, that channel should be standing, not the tummy. GB specification: Specification origin length (m) 5 # Local Chang Fu Heli 6.3 # 6 together 68 local Chang Fu Chang Fu # local forces 610 # 12 # Maanshan Maanshan Jiang Tian Jiang Tian 6/9 6/9 14 # AB horse Steel 6/9 16 # AB Jiang Tian Jiang Tian Maanshan Maanshan 6/9 18 # AB Jiang Tian 9 20 # AB Maanshan Jiang Tian Jiang Tian 9/12 22 # AB 12 25 # AB Maanshan Jiang days of sunshine Laiwu Steel 12 28 # AB Jiang days of sunshine Laiwu Steel 12 30 # AB Jiang days of sunshine Laiwu Steel 12 32 # AB Jiang days of sunshine Laiwu Steel 12 36 # AB Haicheng Laiwu Steel 12 40 # AB Haicheng Laiwu 12 GB I operated channel for Maanshan, Jiang Tian, ??sunshine, Jinxi agent in Changzhou region, Maanshan Iron and Steel products within 5% tolerance, sunshine, Jinxi product tolerances within 5%, the material is Q235B, Jiang Tian, ??Haicheng, tolerance Honggang 8% - 10%. GB slot from 14 # start points A, B, B-type than in terms of leg high waist thick type A, should more than 2mm, sales account management. Protocol type channel? 10 # 9m? 12 # 9m? 14 # 9m? 16 # 9m? 18 # 9m? 20 # 6m / 9m? 22 # 9m / 12m? 25 # 9m / 12m? 28 # 9m / 12m? 30 # 9m / 12m or more for Tangshan Iron and Steel Products, tolerance in 15% - 30%, Paul materials, can weigh sales, less management terms, there is a channel with a special tolerance of about 15%. Protocol Class light channel: 5 # --18 # (non-standard) 5 # 15kg 20 kg 25 kg 28 kg 6.3 # 15.5kg 20kg 25kg 30 kg 32kg 34kg 8 # 20kg 25kg 30kg 35kg 40kg 42kg 10 # 30kg???? 35 kg 40 kg 45kg 50kg 52kg? 12 # 40kg 45kg 50kg 55 kg 60kg 62kg? 14 # 45kg 50 kg 55kg 60kg 65kg 70 kg 75kg? 16 # 55kg 60kg 65kg 70 kg 75kg 80kg 85kg 88kg? 18 # 85kg 90kg 95kg 100kg 105kg? Above Tangshan Iron and Steel Products, tolerance in 15% - ranging from weight estimates only 50% of the material is Q235, length is 6m, weighing sales.