Thick-walled coil steel coil steel the name suggests is made of steel plate rolling, mainly used for billboards, engineering column, a large shaft processing and other industries. General coil pipe wall thickness 6-20mm, cold roll thickest processing to the 20-35mm. 
 Thick-walled steel pipe of coils general coil steel pipe wall thickness of 45mm or more, increase strength and hardness of the steel plate wall thickness increase, if it is way to cold volume likely to cause injury of raw materials, cracks and other signs of the thick-walled steel pipe is necessary to use the method of hot rolled, the steel plate after rolling and then welding the overall heating, in the rolling machine, rotational molding, again by welding to the length of the customer needs, and then weld inspection, weld reinforcement worn After the test factory. Lee Hyo wide 13406358016 
 Thick-walled coil pipe for large diameter roll intensity, generally are volume 1.8-2.5m and then welded to the length of the customer requirements. Also known as T-welding thick-walled coil steel material could be Q235B, Q345B, Q345C, Q345A, 16Mn. 45 # or high alloy is relatively rare, because of their higher strength.