1.Hexagon steel tube for heat exchanger size from outer diameter 10-60mm,number of teeth can be arbitrarily selected according to user's requirements.2.Small diameter special hexagon steel tube such as outer circle inner hexagon,round outside but square inside,outer hexagon inner circle and so on.Specifications from the outer diameter of 8-60mm,the inner hole according to customer requirements.3.Precision tubes for motor vehicles - SteeltubePrecision tubes must have smooth outer and inner surface.The roughness value (Ra) is less or equals to 4 micrometers (0.004 mm) for the outer surface in the tubes in the +SR,+A and +N condition and is less or equals to 4 micrometers (0.004 mm) for the outer and inner
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