What
is black steel?
Black iron is the uncoated steel and is also called as black steel. When
steel pipe is forged, a black oxide scale forms on its surface to give it
the finish which is seen on this type of pipe. Because steel is subject to
rust and corrosion, the factory also coats it with protective oil. Those
black steel are used for manufacturing pipe and tube, which will not rust
for a long time and requires very little maintenance. It is sold in standard
21-foot lengths TBE.
Usages:
Widely applicable for ordinary uses in water, gas, air and steam, black
steel tubes and pipes are utilized for gas distribution inside and outside
the house and for hot water circulation in boiler systems. It is also used
for line pipes in oil and petroleum industries, for water wells and for
water, gas and sewage purposes. It is not used for potable water or for
drain waste or vent lines.
How it is used:
Black steel pipes and tubes are cut and threaded to fit the job. Fittings
for this type of pipe are of black malleable (soft) cast iron. They connect
by screwing onto the threaded pipe, after applying a small amount of pipe
joint compound on the threads. Larger diameter pipe is welded rather than
threaded. Black steel pipe is cut either with a heavy-duty tube cutter or
cutoff saw or by hacksaw.