Black steel pipe:
Seamless Steel Pipe
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. 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.
Product black steel pipe
Standard U.S.A. ASTM A53/A106/A178/A179/A192/A210/A213/API 5L/5CT
Japan JIS G3452/G3454/G3456/G3457/G3458/G3460/3461/3462/3464
German DIN 1626/17175/1629-4/2448/2391/17200 SEW680
Britain BS 1387/1600/1717/1640/3601/3602/3059/1775
Russia GOST 8732/8731/3183
China GB/T8162/T8163 GB5310/6579/9948
Material
Grade
U.S.A. Gr. B/Gr.A/A179/A192/A-1/T11/T12/T22/P1/FP1/T5/4140/4130
Japan STPG38,STB30,STS38,STB33,STB42,STS49,
STBA23,STPA25,STPA23,STBA20
German ST33,ST37,ST35,ST35.8,ST45,ST52,15Mo3,
13CrMo44, 1.0309, 1.0305, 1.0405
Britain Low, Medium, high
Russia 10, 20, 35, 45, 20X
China 10#, 20#, 16Mn, 20G, 15MoG, 15CrMo, 30CrMo,
42Crmo, 27SiMn, 20CrMo
Out Diameter 8.7mm-720mm
Wall Thickness 0.75mm-120mm
Length 4-12m
Protection Plastic caps/ Wooden case
Surface Black painting/varnished surface,anti-corrosion oil,
galvanized or as per required by customer
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