Black Steel Tubes

When steel tube is forged, a black oxide scale forms on its surface to give it the finish which is seen on this type of tube. Because steel is subject to rust and corrosion, the factory also coats it with protective oil. Those black steel are used for manufacturing tube and tube, which will not rust for a long time and requires very little maintenance. It is sold in standard 21-foot lengths TBE.

Black steel tubes and tubing are cut and threaded to fit the job. Fittings for this type of tube are of black malleable (soft) cast iron. They connect by screwing onto the threaded tube, after applying a small amount of tube joint compound on the threads. Larger diameter tube is welded rather than threaded. Black steel tube is cut either with a heavy-duty tube cutter or cutoff saw or by hacksaw.

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

Size	Outside	Wall	Calculated Weight (Plain end)
N.B. mm	Diameter mm	Thickness	Kg./m	M/Tone (Appr.)
150	168.3	4.8	19.3	52
		5.0	20.1	50
		5.4	21.7	46
		6.0	24.0	41.5
		6.4	25.5	39
		7.0	27.8	36
		8.0	31.6	31.5
175	193.7	4.8	22.6	44
		5.0	23.3	43
		5.4	25.1	40
		6.0	27.8	36
		6.4	29.6	34
		7.0	32.2	31
		8.0	36.6	27.5
		9.5	43.2	23
200	219.1	4.3	22.8	44
		4.8	25.6	39
		5.0	26.4	38
		5.4	28.5	33
		6.0	31.5	31.5
		6.4	33.6	30
		7.0	36.6	27
		8.0	41.6	24
		9.5	49.1	20.5
250	273	4.3	28.5	35
		4.8	32.1	31
		5.0	33.0	30.5
		5.4	35.6	28
		6.0	39.5	25.5
		6.4	42.1	24
		7.0	45.9	22
		8.0	52.3	19
		9.5	61.7	16
300	323.9	4.8	38.2	26
		5.0	39.3	25.5
		5.4	42.4	23.5
		6.0	47.0	21.5
		6.4	50.1	20
		7.0	54.7	18.5
		8.0	62.3	16
		9.5	73.7	13.5
350	355.6	5.6	48.3	21
		6.0	51.7	19
		6.4	55.1	18
		7.0	60.2	16.5
		8.0	68.6	14.5
		9.5
400	406.4	5.6	55.3	18
		6.0	59.2	17
		6.4	63.1	16
		7.0	68.9	14.5
		8.0	78.6	13
		9.5	93.0	11

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