Black Steel Pipes

Black steel pipes are used for line pipes in oil and petroleum industries, for water wells and for water, gas and sewage purposes. Black steel pipe gets its appearance because of a black oxide scale formed on the surface of steel pipes when they are forged.

Black steel pipes and tubing 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.

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.

Widely applicable for ordinary uses in water, gas, air and steam, black steel pipes and tube 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.

Indian Standards
1. Indian Standards: Specification IS: 1239 (Part-I) 1990 (Light, Medium & Heavy Series) Black & galvanized, plain end screwed and socketed.

2. Indian Standards: Specification IS: 1978-1982 upto 200 mm NB grade & YST - 170 and YST - 210.

3. Indian Standards: Specification IS: 1161-1998 upto 150 mm NB grade & YST - 210 and YST - 240.

4. Indian Standards: Specification IS: 3601-1984 upto 168.3 mm OD and 7.1 mm wall thickness.

5. Indian Standards: Specification IS: 3589-1991 ERW Steel Tubes 150 mm to 400 mm NB. Indian Standards: Specification IS: 4270-1992 ERW Steel Tubes for water wells upto 300 mm NB.

British Standards
1. British Standards: Specification BS: 1387-1985 (Light, Medium & Heavy Series) black & galvanized, plain end screwed and socketed. British Standards: Specification BS: 1775-1964. Steel Tubes for mechanical structural and general engineering purpose.

Dimension and Weight (Kg/M)/(lb/ft)

Chemical composition & mechanical properties

Tolerance

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