Ordinary galvanized steel pipes are seamed steel pipes. Galvanized steel pipes are only available on special request. The way to distinguish between seamed and seamless steel pipes is to measure the outer diameter of the pipe. The manufacturing standards of the two steel pipes are different, and the outer diameters are also different. For example, for a steel pipe with a diameter of 100mm, the outer diameter of the seamed one is 114mm, and that of the seamless one is 108mm.
Material | 10#, 20#, 45#, 16Mn, A53(A,B), Q235, Q345, Q195, Q215, St37, St42, St37-2, St35.4, St52.4, ST35 | ||
Wall Thickness | 1MM~12MM | Grade | 10#-45#, 16Mn, A53-A369, Q195-Q345, ST35-ST52 |
Outer Diameter | 20MM~508MM | Grade A, Grade B, Grade C | |
Length | Length:Single random length/Double random length | ||
5m-14m,5.8m,6m,10m-12m,12m or as customer's actual reques | |||
Standard | API 5L, ASTM A53-2007, ASTM A671-2006, ASTM A252-1998, ASTM A450-1996, ASME B36.10M-2004, | ||
ASTM A523-1996, BS 1387, BS EN10296, BS 6323, BS 6363, BS EN10219, GB/T 3091-2001, GB/T 13793-1992, GB/T9711 | |||
Technique | Galvanized Steel Pipe | ||
Packing | Bundle, or with all kinds of colors PVC or as your requirements | ||
Pipe Ends | Plain end/Beveled,protected by plastic caps on both ends, cut quare,grooved,threaded and coupling,etc. | ||
Surface Treatment | 1. Galvanized | ||
2. PVC,Black and color painting | |||
3. Transparent oil,anti-rust oil | |||
4. According to clients requirement | |||
Product Application | 1. Fence, greenhouse, door pipe,greenhouse | ||
2. Low pressure liquid, water, gas, oil, line pipe | |||
3. For both indoor and outdoor the building construction | |||
4. Widely used in scaffolding construction which is much cheaper and convenient | |||
Requirements for galvanized steel pipe:
The outer and inner surfaces of the pipe must be smooth and free from cracks, fissures, material coverage, and non-metallic inclusions. Small scratches, bumps, dents, a thin layer of welding slag or traces are allowed after removing defects produced during production, and avoid wall thicknesses below the allowable minimum. The weld must be dense and continuous, without cracks or other defects that reduce the tensile strength of the weld under the tensile strength of the base metal. The outer boss of the weld is removed. Seams are allowed to be thickened within the permitted diameter limits. The burr inside the weld has not been removed. The edge of the metal strip in the weld is not allowed to have unevenness. The end of the pipe must be cut perpendicular to its axis. Burrs on the pipe ends due to cutting technology processes are allowed. Deformation of the pipe ends is not allowed.
Galvanized pipe must have an adherent, continuous layer of zinc on the inner and outer surfaces. Zinc coverage of both surfaces or only the inner surface is achieved by immersion in a bath of molten zinc. Local roughening and thickening of the zinc layer is allowed, mainly in the section 80 mm from the end of the pipe, where blowing of the pipe is performed. The thickness of the zinc layer on the outer surface must be thinner than that on the inner surface. The inner surface must be approximately 56 µm thick. The linear mass of a galvanized pipe is calculated by adding the mass corresponding to the minimum thickness of the zinc layer to the mass of the pipe.