Structural tube is a ready-primed and zinc-coated Electric Resistance Welded (ERW) product, manufactured for structural purposes. The majority of structural tube manufactured by Orrcon Steel is either painted or galvanised as a value-add process. Two state-of-the-art tube mills in Brisbane manufacture circular, rectangular, square and other structural tube products from 20mm to 168.3mm diameter, with wall thicknesses ranging from 1.6mm to 6.0mm. All Orrcon Steel structural products are available in different surface finishes - SMARTCOTE® (painted), ALLGAL®, Oiled and Black. Most structural products are available in minipaks® providing added value and competitive advantages for you.

Product Range

Structural Steel Info

Standard Grade* Yield Strength Tensile Strength CHS RHS & SHS
    MPa (min) MPa (min) <15 15-30 >30 <15 15-30 >30
AS1163 C250/C250L0 250 320 18 20 22 14 16 18
  C350/C350L0 350 430 16 18 20 12 14 16
  C450/C450L0 450 500 12 14 16 10 12 14

Characteristic Pipe (CHS) Rectangular & Square (RHS / SHS)
External dimensions (d, b, d0) ±1% with minimum of ±0.5mm& maximum ±10% ±1% with minimum of ±0.5mm
Thickness (t) d≤406.4mm ±10% ±10%
  d>406.4mm ±10% with max of ±2mm  
All Sections has a mass not less than 96% of specified nominal mass

Characteristic All Sections
Corner Radius ≤50x50mm equivalent perimeter 1.5t to 3t
Corner Radius >50x50mm equivalent perimeter 1.8t to 3t
Twist (v) ≤2mm ±0.5mm/m length
Concavity / Convexity Max 0.8% or 0.5mm, whichever is greater
Squareness 90 ± 1°
  Pipe (CHS) Rectangle & Square (RHS/SHS)
Straightness 0.20% of total length 0.15% of total length0.15% of total length

Handling & Storage

With metal coated steel, such as Zinc, ACMS, HDG and Pregal, including MAXI-TUBE® and ALLGAL® products, attention should be paid to the conditions of transport and storage to avoid the possibility of damage or wet-storage stain. 

A corrosion known as ‘white rust’ can occur on freshly zinc-coated products that are transported or stored under damp and/or badly ventilated conditions. 

This corrosion is frequently superficial, despite its bulkiness, and even though it can be unattractive, it is not usually detrimental to the other properties of the coating. 

All steel and steel-related products need to be stored in a stable configuration. That means avoiding contact with corrosive agents such as acids, alkalis and salts and keeping away from excessive moisture.

The packed product should be kept undercover in clean, dry and well-ventilated conditions. This is especially important for products in the lower size range as their bundle configuration restricts natural ventilation. 

Storage under covers which restrict ventilation (e.g tarps) is not recommended. 

If products have to be stored outside, then the packs should be broken up and stacked with a wooden spacer between each layer. The stack should be on an incline so that any water can run off the product. 

Never store steel in contact with cardboard or paper products, cinders, clinkers, unseasoned timbers or harmful chemicals. 

White rust can be removed with a high pressure water cleaner, scrubbing brush or soft scouring pad. Kerosene can also be used. 

If the metal coating is subject to excessively rough treatment some damage occur, the area should be cleaned and touched up with one of the following coatings:

Organic Zinc-rich primer
Inorganic Zinc silicate paint
Zinc metal spray

Apply these coatings in accordance with manufacturer recommendations.

RESOURCES TO HELP YOU

Circular Hollow Section

Orrcon Steel distributes and manufactures circular hollow sections in a wide range of sizes. Our Circular Hollow Sections are manufactured to the Australian Standard for structural steel hollow section AS/NZS 1163 and cover steel grades C250L0 and C350L0. A variety of surface finishes are available across our range of structural tubulars, but not all finishes are available in all sizes. Orrcon Steel also provides additional services including Jet rolling, Minipaks®, laser tube cutting, pack cutting, pipe threading, shouldering and roll grooving.

Rectangular Hollow Section

Orrcon Steel distributes and manufactures rectangular hollow sections in a wide range of sizes. Our Rectangular Hollow Sections are manufactured to the Australian Standard for structural steel hollow section .0AS/NZS 1163 and cover steel grades C250L0, C350L0 and C450L0. A variety of surface finishes are available across our range of structural tubulars. Not all finishes and grades are available in all sizes. Orrcon Steel also provides additional services including Jet rolling, Minipaks®, laser tube cutting, pack cutting, pipe threading, shouldering and roll grooving.

Square Hollow Section

Orrcon Steel distributes and manufactures rectangular hollow sections ranging from 38x25mm to 400x300mm.* Our Rectangular Hollow Sections are manufactured to the Australian Standard for structural steel hollow section AS/NZS 1163 and cover steel grades C250L0 and C350L0.