Black steel is the uncoated 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 black steel is subject to rust and corrosion, the factory also coats it with protective oil.
China 300X300 Black Square Steel Pipe - China Steel Pipe Black square pipe:Thickness(mm) 0.8-12mm:Size(mm) 20*30-200*400:Type:Square or rectangular:Standard:GB/T3094-2000, GB/T6728-2002, ASTM A500, JIS G3466:Grade:Q195, Q215, Q235, Q345,A500, , SS400, Certificate:SGS, ISO:Usage:Construction frame, large bridge, car keel, fence tube, machine manufacturing, container frame:Technique
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