AS1163 is the Australian/New Zealand Standard for Cold-formed structural steel hollow sections. This Standard specifies the requirements for the production and supply of cold-formed, electric resistance-welded, steel hollow sections used for structural purposes. It considers three strength grades, with or without impact properties, that are suitable for welding. This Standard applies to structural hollow sections formed cold without subsequent heat treatment. The purpose of AS1163 standard is to provide manufacturers and suppliers with a uniform method of specifying the requirements for the production of cold-formed, electric resistance-welded, steel hollow sections. The dimensions, tolerances, and other relevant properties specified in this Standard are those appropriate to current manufacturing capabilities and practices. This Standard is not intended to convert non-compliant steels into grades that meet the requirements of this Standard. However, nothing in this Standard shall be taken to prohibit the use of lower grades of material than those specified if such use can be shown to be consistent with good engineering practice. In particular, nothing in AS1163 standard precludes the formation of cubic or non-circular shapes from material complying with the dimensional tolerances specified herein by methods.

Why choose tuspipe?


Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.

With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,  the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

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Dimensions and Sizes of AS1163 Round Pipes

Outside Diameter Thickness Mass per Unit Length Outside Diameter Thickness Mass per Unit Length
O . D . W . T . Weight O . D . W . T . Weight
mm mm kg / m mm mm kg / m
42.4 3.2 3.09 165.1 3.0 12.00
42.4 4.0 3.79 165.1 3.5 13.90
42.4 4.9 4.53 165.1 5.0 19.70
48.3 3.2 3.56 165.1 5.4 21.30
48.3 4.0 4.37 168.3 4.8 19.40
48.3 5.4 5.71 168.3 6.4 25.60
60.3 3.6 5.03 168.3 7.1 28.20
60.3 4.5 6.19 219.1 4.8 25.40
60.3 5.4 7.31 219.1 6.4 33.60
76.1 2.3 4.19 219.1 8.2 42.60
76.1 3.2 5.75 273.1 4.8 31.80
76.1 3.6 6.44 273.1 6.4 42.10
76.1 4.5 7.95 273.1 9.3 60.50
76.1 5.9 10.20 323.9 6.4 50.10
88.9 2.6 5.53 323.9 9.5 73.70
88.9 3.2 6.76 323.9 12.7 97.50
88.9 4.0 8.38 355.6 6.4 55.10
88.9 4.8 9.96 355.6 9.5 81.10
88.9 5.0 10.30 355.6 12.7 107.00
88.9 5.5 11.30 406.4 6.4 63.10
88.9 5.9 12.10 406.4 9.5 93.00
101.6 2.6 6.35 406.4 12.7 123.00
101.6 3.2 7.77 457.0 6.4 71.10
101.6 4.0 9.63 457.0 9.5 105.00
101.6 5.0 11.90 457.0 12.7 139.00
114.3 3.2 8.77 508.0 6.4 79.20
114.3 3.6 9.83 508.0 9.5 117.00
114.3 4.5 12.20 508.0 12.7 155.00
114.3 4.8 13.00 610.0 6.4 95.30
114.3 5.4 14.50 610.0 9.5 141.00
114.3 6.0 16.00 610.0 12.7 187.00
139.7 3.0 10.10
139.7 3.5 11.80
139.7 5.0 16.60
139.7 5.4 17.90

Steel Grades of AS/NZS 1163 Pipes

The grade designation (for example, C250) is based on the steel’s nominal minimum yield strength (in MPa). To indicate that the section is cold-formed, the prefix ‘C’ is used before the value of the nominal yield strength of the steel. AS1163 only takes into account cold-formed structural steel hollow sections. As specified in AS1163, the suffix ‘L0’ denotes impact properties at 0°C.

All grades shall be designated in the format shown in the following :

Examples :

 AS / NZS 1163-C350

     AS / NZS 1163-C350L0


     AS / NZS 1163 = number of this Standard

     C           = cold – formed sections

     350       = minimum yield strength in MPa ( see Table 7)

     L            = guaranteed impact properties of the material ( when applicable )

     0           = low temperature impact test at 0C( when applicable )

Chemical Composition of AS1163 Materials

As per the AS1163 standard, sampling methods for chemical analysis must be in accordance with AS/NZS 1050.1 or ISO 14284. This is to ensure that the results of the analysis are accurate. The accuracy of the results is essential in order to make decisions about the quality of the product. AS/NZS 1050 series Standards or other procedures that achieve the same, or better, degree of accuracy must be used in order to determine the chemical composition. This is because it is important to have reliable information about the chemical composition in order to make decisions about the safety and quality of the product.

Grades ( see Note 1) Chemical composition ( cast or product analysis )( see Note 2)% max .
C Si Mn P S Cr Mo Al ( see Note 3) Ti Micro – alloying elements CE ( see Note 4)
C250,C250L0 0.12 0.05 0.5 0.03 0.03 0.15 0.1 0.1 0.04 0.03( see Note 5) 0.25
C350,C350L0 0.2 0.25 1.6 0.03 0.03 0.3 0.1 0.1 0.04 0.15( see Note 6) 0.43
C450,C450L0 0.2 0.25( see Note 7) 1.7 0.03 0.03 0.3 0.35 0.1 0.04 0.15( see Note 6) 0.43
NOTES : 1 The use of sulphide modification manufacturing techniques for these grades is permitted . 2 The following elements may be present to the limits stated : ( a ) Copper 0.25%. ( b ) Nickel 0.25%. 3 Limits specified are for soluble or total aluminium . 4 Carbon equivalent ( CE ) is calculated from the following equation :
as 1163

5 Applies to niobium and vanadium only . However , niobium greater than 0.010% is not permitted .
6 Applies to niobium , vanadium and titanium only . However , vanadium greater than 0.10% is not permitted .
7 For circular hollow sections ( CHS ), the silicon limit shall be 0.45.

Mechanical Properties of AS1163 Materials

Tensile tests, impact tests, and flattening tests are very important when measuring the mechanical properties of AS1163 materials. These tests help determine the material’s ability to resist forces that can cause it to break or deform. The tensile test measures a material’s ability to withstand pulling forces, while the impact test measures its resistance to shattering forces. The flattening test, meanwhile, assesses a material’s ability to resist crushing forces. Each of these tests is essential for understanding the overall strength and durability of AS1163 materials. By assessing the results of these tests, engineers can ensure that these materials will be able to perform as intended in a variety of applications.

Tensile testing is an essential process for determining the strength and properties of materials. In order to ensure accurate results, it is important to follow the guidelines set out in AS 1391. This standard specifies the rate of straining that should be used when approaching the yield strength, as well as the limits for the conventional straining rate. In addition, the impact test specified in AS 1544.2 must be carried out on each of the three test pieces prepared from each sample. These tests are essential for ensuring the safety and quality of materials.

- AS1163 Tensile Test Requirements

Grade Minimum yield strength MPa Minimum tensile strength MPa Minimum elongation as a proportion of the gauge length of 5.65√S。( see Note )%
Circular hollow sections d0 / t Rectangular hollow sections b / t , d / t
≤15 >15≤30 >30 ≤15 >15≤30 >30
C250,C250LO 250 320 18 20 22 14 16 18
C350,C350LO 350 430 16 18 20 12 14 16
C450,C450L0 450 500 12 14 16 10 12 14
 NOTE : These limits apply to the face from which the tensile test is taken . That is , for RHS , the use of b / t or d / t ratio is dependent on which face the test specimen is cut from . For SHS , there is only one ratio ( as b = d ).

- AS1163 Charpy V-Notch Impact Test Requirements

Grade Test temperature ℃ Minimum absorbed energy , J
Size of test piece
10 mm x10 mm 10 mm x 7.5 mm 10mmx5mm
Average of 3 tests Individual test Average of 3 tests Individual test Average of 3 tests Individual test
C250LO C350L0 C450LO 0 27 20 22 16 18 13

The tolerances of AS1163 Standard

The tables given below show the dimensional and mass tolerances for AS1163 cold-formed hollow sections. The first table is for shape and mass, while the second is for length. As can be seen, the tolerances are relatively tight, especially for mass. This is due to the fact that hollow sections are often used in load-bearing applications, and even small deviations from the nominal dimensions can lead to significant changes in performance. As a result, it is important to ensure that cold-formed hollow sections meet the tolerances given in the tables below. Doing so will help to ensure that they perform as intended and do not fail prematurely.

- AS1163 Tolerance for Shape and Mass

Characteristic Circular hollow sections Square and rectangular hollow sections
External dimensions ( do , 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 do ≤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.

- AS1163 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 .

How to Find A Reliable AS/NZS 1163 Pipe Mill in China?

When purchasing steel pipes that meet the AS1163 and API 5L dual standards, it is important to be aware of the fake certificates that some companies use. These fake certificates are often created using photoshop and can be very difficult to identify. However, they can often trick buyers into thinking they are getting a high-quality product when in reality the product is of low quality and may even be dangerous. This damages the projects that use these pipes because they are not up to code and they can cause safety issues. If something goes wrong, the company that chose the supplier with a fake certificate can be sued and lose a lot of money in compensation payments. To avoid this, it is essential to do your research and only purchase pipes from a trusted supplier. With so much at stake, it is simply not worth taking the risk of using a fake certificate.

1. Check the API Composite List

api 5l piep

The American Petroleum Institute (API) is a trade association that represents the oil and gas industry. API certification is a voluntary process that shows that a company meets the API’s standards for quality and safety. The API Composite List is a directory of all the companies that are certified by the API. This list can be used to check if a company is authorized to use the API logo on its products. To search the Composite List, 

1) Open the API official website and look for the “API Composite List” tab;

2) Find the screenshot above, search company name or authorized number, and click “Search”;

3) Check the detail of the company regarding the authorization types and the authorization status. 

If you are looking for a certain type of certification, and the certificate status shows “Active”, then you can be sure that you are safe at this stage. You may also be interested in checking the company details to see if you are dealing with the right person. To do this, simply click on the company name shown in red. This will take you to the company’s page where you can find more information about them. Once you have verified that the company is legitimate, you can move on to the next stage of your research.

2. Check the Non-Licensee / Registrant List

api 5l pipe

The American Petroleum Institute (API) strives to maintain the highest standards in the industry and to ensure that only qualified suppliers are providing products and services to its members. As part of this commitment, API maintains a Non-Licensee/Registrant List of companies who are supplying with fake certificates or otherwise operating outside of the requirements set forth by API. The list is updated regularly, and companies that appear on the list should be avoided. 

1) Simply visit the API official website and select the “Non-Licensee/Registrant List” option from the drop-down menu;

2) Scroll down to find out which companies are dealing with fake licenses.

This information can be used to down your search for a qualified pipe supplier. If you are looking for a certain company, you can enter its name in the “Search” field.

3. Check the MTC from the Supplier

api 5l pipe
Even if you find nothing unexpected in the preceding stages, it does not necessarily indicate that your supplier is qualified. recommend checking its MTC in the following step. am aware that it is simple to “clone” an MTC, but it may still have certain flaws.


1) The company name – as you can see in the above picture, the name is very similar to our company name, but they are absolutely different. The company names are always same with that on the certificates. Even an abbreviation is not a reasonable explanation.

2) As we all know that CNAS is an agency that analyzes whether or not a laboratory may be accredited by China’s National Accredited Testing Laboratory. It has bilateral or multilateral accrediting cooperation agreements with important international accreditation agencies. And, a qualified AS1163 steel pipe mill has to obtain the CNAS certificate first before producing and selling to Australia and New Zealand markets. So we will check the CNAS registration number on the MTC. First, visit the CNAS official website; Next, click on “Find an Accredited Body“; Then, click on “Testing & Calibration Laboratories“, and type in the registration number or the company name; Finally, you can check if the registration number and company name are matched to the MTC you have;

3) Finally, the API certification number – Usually, a steel pipe mill that is holding the API certification would show the certification numbers on the MTC. While there is none of it on the sample MTC above.

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