square steel tube for structure

We are specialized in making big diameter&thick square&rectangular steel tubes with different standar. Our main products: square & rectangular steel tube Dimentions: 20*20-500*500 mm thickness : 2-25mm material: Q235B Q345B 20# and so on Implement of standars: GB/T 3094-2000 , GB/T 6728-2002 , JISG 3466 and so on Other products : seamless steel tube , weld steel tube , oval tube, steel tube with the compound sections Using in :construction ,machinery manufacturing,steel construction project , shipbuilding,solar power generation stent,Agricutural and chemical machinery,curtain wall,airport and so on. we are sincerely welcome new and old friends to visit us.we will show you the best goods and service. contact jack li :0086-0317-3099705 8613653375788