DIN17177 Electric Resistance Welded Steel Tubes For Elevated Temperature

DIN17177 Electric Resistance Welded Steel Tubes For Elevated Temperature

Description of DIN17177 standard

DIN 17177 standard is intended for electric resistance welded tubes manufactured from the heat-resisting steels for the construction of boilers, pipework, pressure vessels and equipment based on the existing selection of steels used in part for temperatures up to 530℃ and at simultaneous high pressures, where the total stress and the relevant scaling conditions can raise or lower the temperature limit. Steels possessing good mechanical properties, even under longtime stressing, at elevated temperatures, occasionally up to 530℃, shall be regarded as being heat-resistance for purpose of this standard.

Steel classification in DIN 17177 standard

St37.8, St42.8, 15Mo3

Manufacturing process of DIN17177 electric resistance welded steel tubes for elevated temperature

The tubes in this specification shall be manufactured from hot or cold rolled strip by means of electric resistance welding. If required, they are additionally hot reduced or cold formed. Welding should ensure a weld efficiency. The steel used shall be made by oxygen blowing process, the open hearth furnace or the electric furnace. All steels shall be killed.

Delivery condition

Tubes are delivered after heat treatment. We can supply the electric resistance welded steel tubes with suitably heat treated over their entire length. The condition for an efficient heat treatment shall be regarded as satisfied, if hot working, as the last tube making operation, guarantees a good and reasonably uniform structure.

Appearance of electric resistance welded steel tubes

The steel tubes we supplied have a smooth external and internal surface in keeping with the manufacturing process. A distinction is to be made between hot worked and cold worked finishes. The tubes are free from cracks, scale and laps. We have removed the external weld bead and the permissible minimum wall thickness must not be exceeded. If the tube surface are intended to be coated with a corrosion inhibitor providing protection for a limited period, this shall be agreed at the time of ordering.

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