Cold Rolled Mild Steel, Pre Galvanised and Aluminised coil is purchased - primarily from New Zealand's sole Steel producer - to stringent SPCD drawing gauge specifications that match or better similar products made internationally.
Standard Base materials currently used include:
Alternative base materials can be used by special arrangement.
Full mechanical properties for all base material used is available on our Web Site, or our Product Catalogue supplied on request.
Industrial Tube Manufacturing Co. Ltd takes pride in efficiently producing quality tubing on a consistent basis. This is achieved through adherence of their AS/NZC ISO 9002 accreditation, and commitment toward improved production efficiencies.
During our manufacturing process the tube is subjected to stringent testing:
This specification applies to general tube and food / milk processing industry (FQ).Equivalent standards :
AS1528.1 - Tubes for the food Industry
ASTM A249 & A269 - Boiler, heat exchanger and condenser tubes
ASTM A554 - General & Architectural Application
Available sizes :
Tube sizes range from 6.35 mm to 203.2 mm outside diameter.
Grades of Material :
304, 304L,316, 316L Stainless SteelManufacture :
Automatic tig welding with no addition of filler metalHeat treatment :
Tube is not post weld heat treated except for Standards ASTM A269 & A249 where tube is annealed
|Grades||TP 304||TP 304L||TP 316||TP 316L|
|Cr||17.5 -- 19.5||17.5 -- 19.5||16 -- 18||16 -- 18|
|Ni||8 -- 10.5||8 -- 12||10 -- 14||10 -- 14 |
|TP 304 & TP 316||205 MPa min|
|TP 316L & TP304L||170 MPa min|
|TP 304 & TP 316||515 MPa min|
|TP 316L & TP 304L||485 MPa min|
|TP 304 & TP 304L||92 HRB / 202 HB30 max|
|TP 316 & TP 316L||95 HRB / 217 HB30 max|
Reverse Bend Test :
Flatten to 2 times material thickness.
Flare / Cone Test :
Minimum 1.21 tube diameter (60 deg included angle).
Flange Test :
Minimum 1.10-1.15 tube diameter.
Eddy Current Test :
All tube diameters are on-line eddy-current tested.
Outside diameter (OD)
|O/D ≤ 31.8 µm||± 0.13 µm|
|31.8 < O/D ≤ 76.2 µm||± 0.25 µm|
|101.6 < O/D ≤ 127.0µm||± 0.38 µm|
|152.4 < O/D ≤ 203.2µm||± 0.76 µm|
Difference between maximum and minimum diameters at any one cross section to be within max & min sizes as above.
Thickness tolerance :
to ±0.10mm (AS 1528:1)
Weld Bead :
Weld bead of tube without cold work controlled to 110% of wall thickness
Maximum of 1.0 mm / metre
Length tolerance :
Standard length 6 metres -0 /+35 mm Cut to exact length jobs, by agreement (+/- 1 mm)