BJH

RHS


Following the introduction of CHS, RHS have also become very popular in many forms of construction and other structural and mechanical applications. This has been greatly assisted by the sections inherent flat surfaces making it more economical for joining and other fabrication processes. In this instance, and unlike CHS, the sections only need to be straight-cut (when joining to other flat surfaces) instead of profile cut. Minimal edge preparation is required for joining and welding RHS.
Like CHS, RHS are also aesthetic, possess clean lines, functional, interact less with external environmental effects and are highly desired from an architectural perspective.

Application areas:
  • Structural uses in residential, commercial and industrial construction, signage, leisure equipment, transport industries, mechanical, heavy engineering, mining and resources, process engineering, materials handling and agricultural.
 
PRODUCT AVAILABILITY GUIDE.PDF
 
RHS MASS & BUNDLING DATA 1.PDF
RHS MASS & BUNDLING DATA 2.PDF
TELESCOPING RHS SECTIONS
 
Grades
 
as1163 - c350l0
 
Grade C350L0 has a higher yield strength than grade C250L0, which means that lighter, more economical sections can be used to replace heavier sections in many applications.
OneSteel Australian Tube Mills Grade C350L0 steels are fully compliant with AS 1163 and can be readily processed to Australian/New Zealand Standards and/or industry practice for:
  • General, mechanical, piping and structural fabrication
  • Rolling/bending member lengths
  • Welding
  • Galvanizing
  • Surface preparation for top coats
  • End processing (screwed, swaged)
    – for CHS.
Due to the refined chemistry and higher level of working during the coil and tube manufacturing process, C350L0 steel grade is available in the following ATM tubular products:
  • CHS
  • RHS
  • UniRail
  • StockRail
  • Other sections based on enquiry.
Specifications and Standards
  • Minimum Yield Strength: 350 MPa (a measure of how strong the tube is – see Table 3).
  • Standard designation: AS 1163 – C350L0 see definition at the end of this Guide).
  • Steelmaking process: Fine-grain continuously-cast practice.
  • Product manufacture: Cold-forming and high frequency Electric Resistance Welding (ERW) of steel strip. The cold-forming process enhances the strength, hardness and surface finish of the manufactured product.
  • Chemical composition: See Table 4 which applies to steelmake cast analysis and finished product analysis.
  • Carbon Equivalence (CE): 0.39 – see Table 4 for details.
  • Welding Code Steel Type: Type 5 (from Table 4.6.1(B) of AS/NZS 1554.1 and Table 4.5.1(B) in AS/NZS 1554.5).
  • Mechanical properties: See Table 3 for tensile test and below for impact test requirements. For cold-flattening tests, AS 1163 requires deformation to 75% of initial tube depth.
  • Impact Properties: Satisfies Clauses 15.2 and 16.2 of AS 1163 for Charpy V-Notch impact tests at the test temperature of 0oC (i.e. L0).
 
AS1163 – DualGrade C350Lo/C450Lo
 
Dual-stocking of grades for a particular section is costly. If the same section can comply with the requirements of both the commonly specified lower strength grade and the structurally efficient higher strength grade, a lower cost product will be available to the specifier and end-user.
OneSteel Australian Tube Mills DualGrade® steels are fully compliant with AS 1163 and can be readily processed to Australian/New Zealand Standards and/or industry practice for:
  • General, mechanical and structural fabrication
  • Rolling/bending member lengths
  • Welding
  • Galvanizing
  • Surface preparation for top coats.
DualGrade® products comply with the requirements of two AS 1163 steel grades – Grades C350L0 for tensile test elongation requirements and C450L0 for strength requirements. A further explanation of DualGrade®, how to design and fabricate with DualGrade®, is presented below.
Due to the refined chemistry and higher level of working during the coil and tube manufacturing process, DualGrade® steels are available in the following ATM tubular products:
  • RHS
  • SHS
  • SiloTube
  • Other sections based on enquiry.
Specifications and Standards
  • Minimum Yield Strength: 450 MPa (a measure of how strong the tube is – see Table 5).
  • Standard designation: AS 1163 – C450L0 (see definition at the end of this Guide). Alternatively, if acceptable to the specifier/purchaser, the designation ‘DualGrade®’ or ‘DualGrade® C350L0/C450L0’ may be used. See further
    explanation below on ‘What is DualGrade®?’.
  • Steelmaking process: Fine-grain continuously-cast practice.
  • Product manufacture: Cold-forming and high frequency Electric Resistance Welding (ERW) of steel strip. The cold-forming process enhances the strength, hardness and surface finish of the manufactured product.
  • Chemical composition: See Table 6 which applies to steelmake cast analysis and finished product analysis.
  • Carbon Equivalence (CE): 0.39 – see Table 6 for details. (Note: this is the same limit as for C350L0 products).
  • Welding Code Steel Type: Type 7B (from Table 4.6.1(B) of AS/NZS 1554.1 and Table 4.5.1(B)
    in AS/NZS 1554.5).
  • Mechanical properties: See Table 5 for tensile test and below for impact test requirements.
    For cold-flattening tests, AS 1163 requires deformation to 75% of initial tube depth.
  • Impact Properties: Satisfies Clauses 15.2 and 16.2 of AS 1163 for Charpy V-Notch impact tests
    at the test temperature of 0°C (i.e. L0).
 
Coatings
 
DuraGal®
 
Designed to Trim Your Costs
DuraGal® DualGrade® RHS, manufactured in Australia by OneSteel Australian Tube Mills, has become the material of choice in a wide range of applications in the building & construction, engineering, fencing, rural, transport and resource markets.
Available in a large range of popular sizes and thicknesses, the superior benefits of higher strength and the DuraGal® surface finish are designed to help trim your costs.
High Strength
All DuraGal® DualGrade® RHS is manufactured to comply with AS 1163, and meets the requirements of both Grade C350L0 and Grade C450L0, giving you the benefits of the higher strength of Grade C450L0 while maintaining ease of fabrication.
In many applications, DuraGal® allows you to take advantage of the higher mechanical properties and design with a lighter wall thickness, reducing the cost and making handling easier.
DuraGal® is easy to weld with standard consumables.
DuraGal® Surface
DuraGal® DualGrade® RHS features an In-line Hot-dip Galvanized surface finish, and complies with AS/NZS
4792: ILG100.
The DuraGal® process, pioneered and developed in Australia by OneSteel Australian Tube Mills Market Mills, provides a smooth and uniform galvanized coating that can practically eliminate the costs incurred by shot blasting and cleaning. In many cases, such as internal or non-corrosive environments DuraGal® may not even require painting at all.
Why You Should Specify DuraGal® DualGrade® RHS
DuraGal®: Complies with Grades C350L0 and C450L0 of AS 1163: Structural Steel Hollow Sections.
  1. Design more economically with stronger and lightweight sections.
  2. L0 = impact tested steel suitable for low temperature applications.
  3. Consistent quality and dimensional tolerances.
  4. Easy to weld, no special heat treatment required, uses readily available welding consumables
DURAGAL RHS BROCHURE.PDF
DURAGAL WELDING GUIDE.PDF
DURAGAL PAINTING & CORROSION GUIDE.PDF
 
 
SupaGal®
 
SupaGal®, high quality steel tube, is protected by a smooth coating of zinc. Importantly, it is coated on both sides so you get superior protection. Hot-dip galvanized steel strip, prepared in-house using our own state-of-the-art processing plant, is formed and welded using the same high standards as all OneSteel Australian Tube Mills products. Our reputation for quality guarantees that you get the very best.
Through many years of experience, OneSteel Australian Tube Mills has mastered the technique for reinstating the zinc coating along the weld line. Zinc hot spraying, using a special wire, seals the weld area to a level that offers the same protection as the original galvanized coating and through advanced techniques blends with the original coating. It is capable of withstanding the toughest tests.
Many may think that the inside finish doesn’t matter. However failure often occurs because rust and corrosion has started on the inside. The inside can be the weakest point where rust could be eating away! Be satisfied that your product is protected from internal attack by specifying OneSteel Australian Tube Mills SupaGal®.
Specifications and Standards
SupaGal® is manufactured and tested to meet the requirements of the following specifications:
  • Section 3 of AS/NZS 4792 – Hot-dip galvanized (zinc) coatings on ferrous hollow sections, applied by a continuous or a specialized process
  • Minimum Coating Mass: 100 g/m2 each side.
Protect your reputation...inside and out
When your reputation is on the line, make sure that you have protection on the inside as well as the outside.
Industry authorities are concerned that people unwittingly specify or buy tubular steel products which are not suitable for their intended environments. In many instances, these products have inadequate internal protection and then corrode relatively quickly, sometimes with disastrous consequences. In the Australian tube industry, although products might look similar on the outside, it’s what’s on the inside that really counts.
OneSteel Australian Tube Mills sought independent assessment of its SupaGal® range as part of its commitment to manufacture and supply products of the highest quality to our customers. Expert industry authorities, like the Galvanizers Association of Australia (GAA), have endorsed SupaGal® for the quality of its performance. Why? Because independent tests show that SupaGal®, galvanized on the inside and the outside, delivers the best protection in the field for light galvanized hollow sections.
In endorsing SupaGal® products, the GAA said that:
  • There was an urgent need by specifiers to know the capability of various galvanizing systems.
  • AS/NZS 2312 requires hollow sections to be hermetically sealed or otherwise coated to protect interior surfaces from corrosion.
  • Independent neutral salt spray testing (to AS 2331.3.1-1980) showed that the zinc coating on the internal surfaces of SupaGal® inhibits corrosion of the steel substrate for a considerable period...in contrast to uncoated internal surfaces.
  • The longitudinal weld on the internal surface of SupaGal® exhibits no greater deterioration than elsewhere on the coated face.
  • Corrosion of bare cut ends and drilled holes is better controlled by products with coatings on both sides.
  • Corrosion of the exterior surface of SupaGal® is no greater at the weld than elsewhere on the coated face
Tubeline® Painted
 
A smooth, even coat of a general purpose paint is applied to the external surface to act as a temporary rust preventative. The paint coating is 6 to12 microns DFT. This temporary coating should be removed prior to powder-coating or the application of coating systems intended for corrosion protection or architectural finishes. It is easily removed with any of the commercially available solvent based paint strippers, also usually removed as part of the available pre-treatment (caustic bath) system used in the batch hot dip galvanizing process.
The resultant steel surface from the manufacturing process prior to the paint being applied is of better appearance than AS1627.4 Class 1. OneSteel Australian Tube Mills strongly recommends that you check with your coatings manufacturer or supplier whether any additional surface preparation may need to be carried out on the pipe surface, prior to the application of any paint primers, top coats or special finishes
 
Contact your local BJ Howes or Metaland branch for further information and an obligation free quote.