AS/NZS 1163 Hollow Section Carbon Steel Pipe

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AS1163 Cold-Formed Structural Steel Hollow Sections

AS1163 is the standard for cold-formed structural steel hollow sections in Australia and New Zealand. It specifies the requirements for the production and supply of electric resistance welded (ERW) sections used in structures. These high-quality hollow sections are manufactured by cold forming and do not require heat treatment. You can choose from three strength grades: C250, C350 and C450. These grades are available with or without impact properties and are ideal for welding and a variety of structural uses.

The AS 1163 standard is designed to provide manufacturers and suppliers with a consistent specification for determining the production requirements for cold-formed electric resistance welded steel hollow sections. The dimensions, tolerances and other relevant properties listed in the standard are compatible with current manufacturing technology and practice.

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AS1163 Specifications

Standard	AS/NZS 1163
Procedure	ERW (CHS), HOLLOW SECTION (RHS, SHS)
Dimensions	13.5mm -610mm, 2020 – 400400mm
Thickness	2.3mm – 12.7mm, 1.6 – 16mm
Unit Length	Random: 4 – 16mtrs (Fixed length be specified at time of order)
Steel Grade	C250 C250L0, C350 C350L0, C450 C450L0
Surface Coating	NOPC. Varnishing, Oiling, Hot Dip Galvanizing, FBE, 2PP, 3PP, 2PE, 3PE
End Type	Square Cut, Plain, Bevelled, Threaded, Grooved
Joint Method	Fitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
Pipe Machining	Welding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding

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AS1163 Steel Pipes Grades

The steel grade designations of AS1163 (e.g., C250) are based on the nominal minimum yield strength of the steel in MPa. The prefix “C” stands for cold-formed sections. The standard focuses on cold-formed structural steel hollow sections and does not cover hot-formed material. The suffix “L0” in the steel grade indicates that low-temperature testing has been performed.

AS1163 C250

AS1163 C250 has a minimum yield strength of 250 MPa and is typically used in low stress environments such as agricultural structures or small construction projects such as sheds and carports.

AS1163 C350

AS1163 C350 is a widely used grade in AS1163 with a minimum yield strength of 350 MPa, making it ideal for general construction such as commercial building frames, warehouses and bridge support structures.

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AS1163 C450

AS1163 C450 is the highest strength grade specified in AS/NZS 1163 and is used in demanding projects such as large bridges, high-rise building frames and industrial platforms.

AS1163 C250L0

AS1163 C250L0 passes impact testing at 0°C (27 Joules) and is suitable for lightweight structures in low temperature environments such as agricultural frames in cold regions.

Different Manufacturing Types for API 5L Pipes

AS1163 C350L0

C350L0 is the most widely used low temperature grade and is ideal for commercial buildings and bridge supports in cold regions. For example, in winter projects in Auckland, C350L0 SHS (square hollow section) is often used for load-bearing columns.

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AS1163 C450L0

AS1163 C450L0 is suitable for heavy structures in extreme conditions, such as offshore platforms or mining facilities in high cold regions.

Dimensions and Sizes of AS 1163 Pipe

Outside Diameter (mm)	Circular Hollow Sections Wall Thickness (mm)
OD	Circular Hollow Sections Wall Thickness (mm)
42.2	3.2	4.0	4.9	–	–	–	–
48.3	3.2	4.0	5.4	–	–	–	–
60.3	3.6	4.5	5.4	–	–	–	–
76.1	2.3	3.2	3.6	4.5	5.9	–	–
88.9	2.6	3.2	4.0	4.8	5.0	5.5	5.9
101.6	2.6	3.2	4.0	5.0	–	–	–
114.3	3.2	3.6	4.5	5.4	4.8	6.0	–
139.7	3.0	3.5	5.0	5.4	–	–	–
165.1	3	3.5	5.0	5.4	–	–	–
168.3	4.8	6.4	7.1	–	–	–	–
219.1	4.8	6.4	8.2	–	–	–	–
273.1	4.8	6.4	9.3	–	–	–	–
323.9	6.4	9.5	12.7	–	–	–	–
355.6	6.4	9.5	12.7	–	–	–	–
406.4	6.4	9.5	12.7	–	–	–	–
457	6.4	9.5	12.7	–	–	–	–
508	6.4	9.5	12.7	–	–	–	–
610	6.4	9.5	12.7	–	–	–	–

Size(mm)	Square Hollow Sections Wall Thickness (mm)
20 x 20	1.6	–	–	–	–	–
25 x 25	1.6	2.0	2.5	3.0	–	–
30 x 30	1.6	2.0	–	–	–	–
35 x 35	1.6	2.0	2.5	3.0	–	–
40 x 40	1.6	2.0	2.5	4.0	–	–
50 x 50	1.6	2.0	2.5	3.0	4.0	–
65 x 65	2.0	2.5	3.0	–	–	–
75 x 75	2.5	3.0	3.5	4.0	5.0	6.0
89 x 89	3.5	5.0	6.0	–	–	–
100 x 100	3.0	4.0	5.0	6.0	9.0	–
125 x 125	4.0	5.0	6.0	9.0	–	–
150 x 150	5.0	6.0	9.0	–	–	–
200 x 200	5.0	6.0	9.0	–	–	–
250 x 250	6.0	9.0	–	–	–	–

Chemical Requirement of AS1163 Materials

We have strict quality controls. They keep the chemical components intact. This gives you a product that works consistently and reliably.

CHEMICAL COMPOSITION
Grades (see Note 1)	Chemical Composition (cast or product analysis) (see Note 2) % max.
Grades (see Note 1)	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	0.50	0.03	0.03	0.15	0.10	0.10	0.04	0.03 (see Note 5)	0.25
C350, C350L0	0.20	0.25	1.60	0.03	0.03	0.30	0.10	0.10	0.04	0.15 (see Note 6)	0.43
C450, C450L0	0.20	0.25 (see Note 7)	1.70	0.03	0.03	0.30	0.35	0.10	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 aluminum. 4 Carbon equivalent (CE) is calculated from the following equation: 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 Requirement Of AS1163 Materials

Our quality control processes guarantee that these traits are kept during production. They give you a product that meets your project’s demands.

TENSILE TEST REQUIREMENTS
Grade	Minimum Yield StrengthMPa	Minimum Tensile StrengthMPa	Minimum Elongation as a Proportion of The Gauge Length of 5.65√So (see Note) %
			Circular Hollow Sections do/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
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).

CHARPY V-NOTCH IMPACT TEST REQUIREMENTS
Grade	Test temperature°C	Minimum absorbed energy, J
		Size of test piece
		10 mm × 10 mm		10 mm × 7.5 mm		10 mm × 5 mm
		Average of 3 tests	Individual test	Average of 3 tests	Individual test	Average of 3 tests	Individual test
C250L0 C350L0 C450L0	0	27	20	22	16	18	13

Why Choose UNIASEN?

Since its establishment in 1998, UNIASEN (Tianjin) Co., Ltd. has become a leading carbon steel pipe manufacturer. With more than 20 years of industry experience, we have earned a good reputation for maintaining precision and quality.

As one of the largest carbon steel product stocks in China, we serve customers in more than 50 countries, with advanced processing services, surface coatings and customized end types to ensure product durability and perfect suitability for structural applications.

Our team of experts provides professional guidance on dimensions, tolerances and specifications to help you complete your engineering projects efficiently and reliably. Choose UNIASEN, you will get a carbon steel solution you can trust.