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Description:Features: 1) Specification: from 50 x 50 to 400 x 400 2) Thickness: 2 - 12mm 3) Loneness: 6-16m 4) Trademark: Q235, Q345, Q195 5) Form of welding line: straight sew 6) Production techniques: resistance welding 7) Port of tube: without screw thread Our company has 125, 250, and 400 three square and rectangular production lines, and the yield is 0.3million tons annual year. Our steel tubes are mainly used in environmental protection equipment industry, light machine industry and large-scale architecture filed, such as bridge, gymnasium center and others.