Technological Process
Roll-forming of cold-rolled strips of stainless steel or alloys with high content of nickel to the required diameter, TIG welding in inert atmosphere, sizing of outside diameter, heat treatment at 1040-1100°C (for heat treated tube).
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Cutting, winding in coils and up to 300 bar pressure test for the heat treated tube.
Cutting to length, straightening and sizing or de-burring of the ends for the other types of tubes.
Heat-treatment and non-destructive tests are carried out on line without interruption.
Destructive mechanical tests to check the resistance of the weld are carried out cyclically out of the line.
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