Tubes are manufactured from mild steel strips slitted
from Hot Rolled Low Carbon Steel coils conforming to IS: 10748-1995.
The strip passes through a series of drive forming and fin rolls and takes
the required circular shape and is welded continuously by passage of an electric
current of high frequency i.e. 4, 50, 000 cycles/second across the abutting
edges. The tubes thus formed and welded pass through the sizing sections where
dimensional deviations if any are corrected before the tubes are cut into
required length by automatic cutting machines. The tubes are then end deburred
and pressure tested. Thereafter protective surface finishing operations such
as hot dip Galvanizing or varnishing is done as per specific requirement.
The tubes are offered as plain, bevelled, threaded ends or with flanges.
