Longitudinal welded tubes manufactured from flat-rolled products (strips) on electric tube-welding lines using the metod of automatic inert gas (argon) tungsten arc welding, with in line heat treatment.

Garanted mechanical properties

Alloy	Ultimate rupture strenght KSi, min	Elongation %, min
Gr1	34.8	22
Gr2	50.0	20
Вт1-00	36.1	25
Вт1-0	56.8	20