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AS/NZS 1163 is the standard for cold-formed resistance-welded steel hollow sections in Australia and New Zealand. It applies to all steel hollow sections used in building structures.
The standard has multiple grades such as C250, C350, C450, etc. The grade value represents the minimum yield strength of the material (in MPa).
The testing requirements of AS/NZS 1163 include how to cut samples for tensile and impact tests, the aging process, the quality of the hollow section length, and the external welds. These steps help ensure that the product meets quality standards.
Key Specifications
Scope
Covers cold-formed welded hollow sections made from carbon and low-alloy steels.
Primarily used in structural applications (e.g., buildings, bridges, machinery).
Material Grades
Standard grades: C250, C350, C450 (based on minimum yield strength in MPa).
- AS 1163 C250 has a minimum yield strength of 250 megapascals (MPa). It is low cost, easy to process and weld, suitable for projects with limited budgets and low strength requirements.
- AS 1163 C350 is the most commonly used grade in AS 1163, with a yield strength of 350 MPa, and is widely used in frame structures of commercial buildings.
- AS 1163 C450 Its minimum yield strength is 450 MPa. It has high strength and low temperature toughness, and is often used in heavy structures
| Type | ERW (CHS), HOLLOW SECTION (CHS, RHS, SHS) |
|---|---|
| Wall thickness | 1.6 mm to 16 mm |
| Size | Round Hollow Sections (CHS): 21.3 mm* 165.1 mm, larger sizes up to 610 mm are available depending on the manufacturer's capabilities. |
| Square Hollow Sections (SHS): 20mm*20mm – 400mm*400mm | |
| Rectangular Hollow Sections (RHS): 50 *20 mm – 500 mm * 300 mm |
AS1163 Tolerance for Shape and Mass
| Characteristic | Circular hollow sections | Square and rectangular hollow sections |
|---|---|---|
| External dimensions ( d0 , d and b ) | ±1%, with a minimum of ±0.5 mm and a maximum of ±10 mm | ±1%, with minimum of ±0.5 mm |
| Thickness ( t ) | For d0≤406.4 mm :±10% For do >406.4 mm :±10% with a max of ±2 mm |
±10% |
| Out – of – roundness ( o ) | ±2% for hollow sections having a diameter to thickness ratio not exceeding 100( see Note 1) | – |
| Concavity / convexity ( see Note 2) |
– | Max .0.8% or 0.5 mm , whichever is greater |
| Squareness of sides | – | 90°±1° |
| External corner profile | – | See Table 5 |
| Twist ( v ) | – | 2 mm +0.5 mm / m length |
| Straightness ( see Note 3) | 0.20% of total length | 0.15% of total length |
| Mass ( m ) per unit length | Not less than 0.96 times the specified mass ( Note 4) on individual lengths | |
| NOTES : 1.Where the diameter to thickness ratio exceeds 100, the tolerance on out – of – roundness becomes the subject of agreement between the manufacturer and purchaser. 2.The tolerance on convexity and concavity is independent of the tolerance on external dimensions. 3.The straightness tolerance applies to straightness in any one plane. 4.In lieu of any other requirement , the specified mass is considered to be the nominal mass as noted in Clause 15. |
||
Tolerance on Length
| Type of length | Range mm | Tolerance |
|---|---|---|
| Random length | 4000 to 16000 with a range of 2000 per order item |
10% of sections supplied may be below the minimum for the ordered range but not less than 75% of the minimum |
| Mill ( or ' unspecified ') length | All | +100 mm -0 |
| Precision length | <6000 | +5 mm -0 |
| ≥6000≤10000 | +15 mm -0 |
|
| >10000 | +5 mm +1 mm / m -0 |
|
| NOTE : The enquiry and order shall indicate the type of length required and the length or length range , as appropriate . Alternatively , length tolerances shall be specified at the time of order . | ||
Chemical Compositions, max %
| Standard | Grade | C | Si | Mn | P | S | Cr | Mo | AI | Ti | Micro-alloying elements |
CE |
| AS/NZ 1163 | C250 | 0.12 | 0.05 | 0.5 | 0.03 | 0.03 | 0.15 | 0.1 | 0.1 | 0.04 | 0.03 | 0.25 |
| C250L0 | ||||||||||||
| C350 | 0.2 | 0.25 | 1.6 | 0.03 | 0.03 | 0.3 | 0.1 | 0.1 | 0.04 | 0.15 | 0.43 | |
| C350L0 | ||||||||||||
| C450 | 0.2 | 0.25 | 1.7 | 0.03 | 0.03 | 0.3 | 0.35 | 0.1 | 0.04 | 0.15 | 0.43 | |
| C450L0 |
Mechanical Properties
| Grade | Minimum yield strength MPa | Minimum tensile strength MPa | Minimum elongation | |||||
|---|---|---|---|---|---|---|---|---|
| Circular hollow sections d0 / t | Rectangular hollow sections b / t , d / t | |||||||
| ≤15 | >15≤30 | >30 | ≤15 | >15≤30 | >30 | |||
| 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 |
Manufacturing Process of AS 1163 Hollow Sections
The manufacturing process of AS 1163 hollow sections involves a series of carefully controlled steps to produce cold-formed electric resistance welded (ERW) structural steel hollow sections that meet the stringent requirements of the standard.
The process ensures that the sections meet the mechanical properties, dimensional tolerances and quality standards specified in AS/NZS 1163:2016. Below are the detailed steps of the manufacturing process.
- Raw Material Selection: The process begins with the selection of high-quality steel coils, usually made from low carbon steel to meet the chemical composition requirements of AS 1163. The steel must meet the carbon equivalent (CE) limits of the standard.
- Forming and Welding: AS 1163 uses cold forming work hardening to increase the strength of the steel. Once the steel strip is formed into a tubular shape, the edges are joined together and welded using electric resistance welding (ERW).
- Surface Treatment and Finishing: Hollow sections are usually treated with a rolled surface treatment. AS 1163 involves other surface treatments such as galvanizing and coating.
Mechanical Test Requirements of AS 1163 Pipe
AS/NZS 1163 pipe must undergo several mechanical tests, including a tensile test in accordance with AS 1391, an impact test at 0°C as per AS 1544.2, and a cold flattening test.
- Tensile Test
The tensile test is carried out in accordance with AS 1391. The rate of straining when approaching the yield point shall lie within the highest range of strain rate given in AS 1391. This test measures the force required to pull something such as rope, wire, or a structural beam to the point where it breaks.
- Impact Test
Impact tests are performed at 0°C in accordance with AS 1544.2. This test measures the material's resistance to high-rate loading and is used to determine the amount of energy absorbed by the material during fracture. This is important in assessing the material's toughness.
- Cold Flattening Test
The cold flattening test is conducted at room temperature between two parallel plane surfaces. The weld is located at 45 degrees for nominal outside diameters less than or equal to 60 mm and at 90 degrees for diameters greater than 60 mm. The test piece is flattened until the distance between the surfaces is 0.75d, where d is the nominal diameter of the circular hollow section.
Applications
Structural frameworks (buildings, stadiums).
Transport infrastructure (bridges, sign supports).
Mechanical & machinery components.
Latest Version
AS/NZS 1163:2021 (current edition, may include updates to material grades or tolerances).
For full details, refer to the official standard document from Standards Australia (SA) or Standards New Zealand (SNZ).
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