Grade C250 Pipe, for general mechanical and low pressure reticulation applications, is manufactured by cold-forming and high frequency Electric Resistance Welding. The cold-forming process enhances the strength, hardness and surface finish of the pipe and produces product to tight dimensional tolerances. Pipe is tested by using nondestructive Eddy Current methods during the process.
Hot dipped galvanized pipe is manufactured and tested to meet the requirements of AS 4792.
Coating mass: 300 g/m 2 min average both sides.
The coating adherence of the galvanizing is satisfactory for the pipe to be bent to a radius 6 times the diameter of the pipe.
(DN 20 - DN 150) Red/Black/Galvanised 6.5m
Note: DN stands for Nominal Size and replaces NB (Nominal Bore).
Grade C350 Pipe is a lightweight, high strength pipe for general mechanical and structural applications. It is manufactured by cold forming and high frequency electric resistance welding. C350 is available in black, painted and galvanized finishes. Also available with one or both ends swaged in sizes from 25 NB to 50 NB.
Grade C350 pipe is manufactured and tested to meet the requirements of AS 4792 Galvanized coatings.
Coating Mass: 300g/m min average both sides.
The coating adherence of the galvanizing is satisfactory for the pipe to be bent to a radius 6 times the diameter of the pipe.
(DN 20 - DN 150) Red/Black/Galvanised 6.5m
Note: DN stands for Nominal Size and replaces NB (Nominal Bore).
In the seamless pipe-making process tube rounds are heated in a furnace, after which they are pierced, then rolled by the Mandrel or Plug-Mill process into pipes and tubes of specified diameters and wall thicknesses.
Seamless tubular products are generally hot-rolled, but can also be supplied cold-drawn (up to 273mm O.D.) when required.
At the pipe mill the strip is uncoiled, levelled and crop-sheared. It is then trimmed on both sides simultaneously to correct width and immediately fed into the forming and welding line. During the process, the strip is closely checked for surface defects.
A series of cold forming rolls changes the strip progressively into tubular form with abutting edges on top. The longitudinal edges are joined by high frequency electric resistance welding. The weld is then heat treated electrically. Special devices remove inside and outside flash from the weld to give uniform wall thickness of the pipe. The welded part is then heat-treated by post annealing to ensure adequate ductility at the weld and adjacent zone. The pipe is passed through a series of cold sizing rolls to progressively reduce the diameter to accurate size. This operation also increases strength and improves surface condition.
The pipe is then cut to specified length by a flying cut-off machine. After the straightening operation, ends of the pipe are cropped, then squared or beveled depending on end finish requirements.
ASTM A312 (latest edition), Seamless and Welded Austenitic Stainless Steel Pipe. Applicable stock grades are TP304/304L and TP316/316L. Pipe is generally dual certified within each grade. The mechanical and chemical properties applicable to these grades are detailed in the book of ASTM standards. The following chemical analysis chart provides a general comparison between the popular grades.
ANSI/ASME B36.10 (Welded and Seamless Wrought Steel Pipe) and ANSI/ASME B36.19 (Stainless Steel Pipe). These standards cover the dimensions of seamless and welded pipe in this section. The nominal pipe sizes, wall thicknesses and internal diameters for popular sizes and schedules are shown in the table opposite.
Duplex.
Super Duplex.
