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PRECISION TUBE
​SPECIFICATIONS

Products & Surface Finishes
Products
Base Material (Strip)
Typical Applications
Finish
CR250
Cold-rolled close annealed
Furniture, displays, automotive
Higher-grade, bright, critical finish
HR350
Hot-rolled pickled & oiled
Racking, cargo barriers, seat frames
Steel grey, semi-bright finish
GS300
Continuously hot-dip galvanised
Outdoor structures, furniture, fencing, conveyors
Z275 coating (both sides). Spangle
Coating Suitability
Products
Powder Coating
Paint
Chrome Plating
Electroplating
Hot Dip Galvanising
CR250
Excellent
Excellent
Excellent
Excellent
Excellent
HR350
Good
Excellent
Poor
Good
Excellent
GS300
Excellent
Excellent
n/a
n/a
n/a

Note: Our pre-galvanised range maintains the zinc coating adhesion during all of our in-house mechanical testing.

Standards & Tolerances

Made to AS 1450, EN 10305-3 and ASTM A513-1.

Tolerances
Metrics
External Dimensions (OD)
±0.13mm <50.8mm, ±0.26mm <101.6mm
Wall Thickness
CRCA ±5% (<2.0mm), HRPO ±10% (<2.6mm), GALVSTEEL ±7% (<2.5mm)
Out-of-Roundness (Ovality)
±0.13mm <50.8mm, ±0.26mm <101.6mm
Squareness of sides
90° ±1 degree
Twist (Rectangle/Square)
<3mm over 5.5m
Straightness
<5.5mm over 5.5m

During the manufacturing process, our tube undergoes a series of in-house mechanical tests, measurements and inspections to ensure it consistently meets the desired specifications and standards.

 

• 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 and weld bead height, to meet internal and external standards and/or customer specifications.

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