China Black Iron Square And Rectangle Tube

China Black Iron Square And Rectangle Tube
Product name
18×18 Asian Black Iron Square Tube/Black Square Steel Pipe
Outer diameter
10*10mm-600*600mm
Wall thickness
0.6mm-25mm
Length
5.8m-12m
Surface Treatment
Black,oiled
Package
Standard export packing in bundles

Standard
EN3,BS 1387,BSEN10255,ISO 65,AS1163,GB/T3091
Tolerance:
1.On specified OD+/-0.5mm
2.The Inside Diameter of tubes shall allow insertion of a guage of (O.D.-2W.T.-2)mm dia for a minimum length of 20mm
3.On wall thickness +/-0.05mm
4.The mass deviation on a single tube shall not exceed -7.5% of the specified mass.
Surface treatment
Hot Dipped Galvanized, Electrical Galvanized ,oiled, Painted, Hot rolled, cold Rolled, Black Annealing , Bright Annealing
Accessory process
Thread, spray paint, chamfer, punch, drop head ,cold rolling, anneal, laring
Quality control
1)we have our own laboratory, we can do these testings, such as: Tensile test, Yield Test, Flattening test, Bending test, chemical composition and more
2)On-site inspection