Material Properties

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:

• Cold Rolled Mild Steel gauges between:
  0.80mm and 2.5mm.
• Pre Galvanised commercial grade Steel:
  G250 Z275 and G310 Z450.
• Aluminised Steel:
  1.6mm gauge ASTM A463, T1-40.
• Thickness Tolerance:
  +/- 8% of specified wall thickness.
• Surface Finish:
  Lightly oiled.

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.

Quality Standards

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:

• Flare Test: Outside diameter increased by 25% or more without failure to either the base material or the weld zone.
• Flattening Test: Capable of being flattened without  cracking between two parallel planes with the weld zone located at both 90 and 0 degrees.
• Surface examination: Visual inspection for external surface damage, straightness, twist, weld position, correct profile etc. must meet company and/or customer specification.