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For steel pipe buyers in Australia and New Zealand, the standard cannot be selected only by pipe size or wall thickness. The correct specification depends on the application: structural hollow sections, ordinary service piping, pressure piping, water pipelines, piling, or high-pressure transmission pipelines. In many enquiries, buyers ask for “Australian standard pipe” or “AS/NZS pipe” without clearly identifying the actual end use. This can easily lead to wrong quotations. A square hollow section for a building frame, a galvanized pipe for ordinary service, and a welded pipe for water transmission are not controlled by the same standard. They may also require different grades, testing, coating, marking and documentation.
The table below gives a practical view of the standards most often seen in Australia and New Zealand steel pipe enquiries. It is not a substitute for project specifications, but it helps buyers understand which standard belongs to which application.
|
Standard |
Common Product Type |
Typical Application |
Key Point for Buyers |
|
AS/NZS 1163 |
Cold-formed structural hollow sections |
Building structures, frames, bridges, fabrication, SHS, RHS, CHS |
Common grades include C250, C350 and C450. Confirm whether impact-tested grade is required. |
|
AS 1074 / NZS 1074 |
Steel tubes and tubulars for ordinary service |
Low-pressure fluid, general service, non-critical pipework |
Often used for ordinary service rather than structural design or high-pressure pipelines. |
|
AS 1579 |
Arc welded steel pipe |
Water, wastewater, pressure water pipelines, pipe piles |
Usually relevant for large-diameter welded pipe and water infrastructure. |
|
AS 4041 |
Pressure piping |
Industrial pressure pipework |
Material selection must match design pressure, design temperature and service conditions. |
|
AS/NZS 2885 |
High-pressure pipelines |
Gas and liquid petroleum pipelines |
Project engineering, safety and approval requirements are critical. |
|
API / ASTM / EN standards |
Imported project pipe when specified |
Oil, gas, piling, mechanical and structural use |
Often accepted when project documents specify international standards instead of AS/NZS. |
AS/NZS 1163 is one of the most important standards for structural steel hollow sections in Australia and New Zealand. It covers cold-formed welded hollow sections, including circular hollow sections, square hollow sections and rectangular hollow sections. For most commercial structural projects, C350 is one of the most frequently requested grades. However, the buyer should not only mention “C350 pipe”. The enquiry should include the full standard, section type, dimensions, wall thickness, length, surface condition and whether impact testing is required.
|
Grade |
Meaning |
Typical Use |
|
C250 |
Cold-formed structural hollow section with lower yield strength |
Light structural use and general fabrication |
|
C350 |
Higher strength structural hollow section |
Common building frames, construction and machinery structures |
|
C450 |
High-strength structural hollow section |
Weight-saving designs and higher-load structural members |
|
C350L0 / C450L0 |
Impact-tested structural hollow sections |
Projects requiring low-temperature or impact performance |
Example enquiry: AS/NZS 1163 C350 RHS 100 × 50 × 5.0 mm, 6 m length, black finish, MTC required.
AS 1074 and NZS 1074 are commonly associated with steel tubes and tubulars for ordinary service. This type of pipe is often used for low-pressure or general-purpose applications, depending on the project requirement. Buyers should be careful not to use AS 1074 as a replacement for structural hollow sections or pressure pipeline standards. It is important to confirm whether the pipe is intended for ordinary service, water, gas, structural support, fire protection, or pressure piping.
|
Buyer Requirement |
What to Confirm |
|
Galvanized pipe |
Zinc coating requirement, thread type and end finish |
|
Ordinary service pipe |
Light, medium or heavy class requirement |
|
Threaded pipe |
Thread standard and coupling requirement |
|
Fluid service |
Whether pressure rating and test certificate are required |
|
Export shipment |
Marking, bundling, coating and packing list |
AS 1579 is often relevant for welded steel pipe used in water transmission, wastewater pipelines and pipe piles. Compared with ordinary service pipe, AS 1579 projects usually pay more attention to diameter, wall thickness, welding quality, coating, hydrostatic testing and project documentation. For large-diameter welded steel pipes, buyers should confirm whether the project needs ERW, LSAW or SSAW pipe. For water projects, coating and lining are often as important as the pipe body itself.
|
Item |
Recommended Confirmation |
|
Pipe manufacturing process |
ERW, LSAW, SSAW |
|
End use |
Water, wastewater, piling, casing |
|
Coating |
Bare, black paint, epoxy, 3PE, cement mortar lining, FBE |
|
Inspection |
Visual, dimensional, hydrostatic test, NDT |
|
Documents |
MTC, inspection report, coating report, packing list |
For industrial pressure piping, AS 4041 is often referenced. For high-pressure gas and petroleum pipelines, AS/NZS 2885 may be involved. These standards are not only about the steel pipe itself; they are connected with system design, operating pressure, temperature, fluid type, safety factors, welding, inspection and project approval. Overseas suppliers should not recommend a grade only by matching yield strength. The buyer should provide project specifications, design pressure, design temperature, fluid medium, pipe size, wall thickness, corrosion allowance, coating requirement and inspection level.
|
AS/NZS Grade |
Product Type |
Approximate International Comparison |
Notes |
|
C250 |
Structural hollow section |
Similar strength range to lower structural grades |
Used for light structural applications |
|
C350 |
Structural hollow section |
Comparable to common medium-strength structural grades |
Very common for SHS, RHS and CHS |
|
C450 |
Structural hollow section |
Higher-strength structural grade |
Used when design requires higher strength |
|
C350L0 |
Structural hollow section with impact requirement |
Similar concept to impact-tested structural grades |
Confirm test temperature and certificate |
|
C450L0 |
High-strength impact-tested hollow section |
Higher strength with impact properties |
Used for more demanding structures |
This comparison is only for purchasing reference. Final substitution must be approved by the project engineer, because chemical composition, mechanical properties, impact testing and dimensional tolerances may not be identical across standards.
|
Information |
Example |
|
Standard |
AS/NZS 1163, AS 1074, AS 1579, AS 4041, API 5L |
|
Grade |
C350, C350L0, C450, or project-specified grade |
|
Pipe type |
CHS, SHS, RHS, ERW, LSAW, SSAW, seamless |
|
Size |
OD × WT, or section size × wall thickness |
|
Length |
6 m, 12 m, fixed length, random length |
|
Surface |
Black, galvanized, painted, coated |
|
Testing |
Hydrostatic test, NDT, impact test, tensile test |
|
Documents |
MTC, inspection certificate, packing list, COO |
|
Destination |
Australia, New Zealand, port, project site |
For structural projects, start from AS/NZS 1163 and confirm whether C250, C350, C450 or impact-tested grades are required. For ordinary service pipe, check whether AS 1074 / NZS 1074 is suitable. For large-diameter water transmission or pipe piles, AS 1579 may be more relevant. For pressure or high-pressure pipeline systems, do not select pipe only by grade; design pressure, temperature, medium and project specification must be reviewed first.
1. EN 10219 vs EN 10210: Key Differences for Structural Hollow Sections
2. S235 vs S275 vs S355 Steel Grades: Which Structural Pipe Grade to Choose?
3. ASTM A500 Grade B vs Grade C: Structural Tubing Guide
