U type tubes are broadlyused on large-scale petrochemical equipments such as the boilers, heat exchangers because the demandfor weld joints. U type tubes have decreased the welding work as well as thewelding inspection at site. Our company has 20 years' experience inmanufacturing U type tubes, but mainly with bending radius bigger than 1.5D.Bending radius smaller than 1.5D will make the bending area seriously deformedand thus cause the tube not proper for using.

Through technicalmodification, our company successfully developed U type tubes with bendingradius smaller than 1.5D and passed the through ball test . Ourcompany installed heat storage type electric resistance furnace which canconduct softening annealing for the bending area to eliminate the stress,improve the property such as corrosion resistance and high temperature resistanceof the bending area.

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