AS/NZS 1074 is the Australian and New Zealand standard for general-purpose steel pipes and fittings. Here is an overview of AS 1074 / NZS 1074 steel pipe.
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Scope and Specifications of AS 1074 / NZS 1074 Steel Pipe
This standard applies to two main categories of steel pipe:
Threaded steel pipes and fittings as specified in AS 1722.1.
Plain-end steel pipes with a nominal size ranging from DN 8 to DN 150.
Pipes manufactured to this standard, with the latest version being AS 1074-2018, are available in three distinct wall thicknesses: light, medium, and heavy.
Manufacturing and Finishes of AS 1074 / NZS 1074 Steel Pipe
AS/NZS 1074 pipes can be produced through either a seamless or a welded process. The most common welded method is Electric Resistance Welding (ERW). The standard also specifies three available end finishes for the pipes:
Plain-end
Screwed (threaded)
Socketed
AS 1074 / NZS 1074 Chemical Composition
|
Standard
|
P
|
S
|
CE
|
|
AS 1074 (NZS 1074)
|
0.045% max
|
0.045% max
|
0.4 max
|
Carbon Equivalent (CE)
CE, or Carbon Equivalent, is a calculated value used to assess the weldability of steel. It is determined using the following formula:
CE = C + Mn / 6
Mechanical Properties of AS 1074 / NZS 1074 Steel Pipe
Minimum yield strength: 195 MPa
Minimum tensile strength: 320–460 MPa
Elongation: Not less than 20%
Tightness Testing Requirements
Each steel pipe must undergo one of the following pressure-tightness tests to ensure quality:
1. Hydrostatic Test
The pipe must sustain a hydrostatic pressure of 5 MPa for a sufficient duration without any signs of leakage.
2. Non-Destructive Testing (NDT)
Eddy Current Testing: Performed in accordance with AS 1074 Appendix B
Ultrasonic Testing: Conducted as specified in AS 1074 Appendix C
AS 1074 Steel Pipe Weights and Dimensional Tolerances
Steel pipes are categorized into three wall thickness classes: light, medium, and heavy. Each class has distinct outer diameter (OD) tolerances and weight specifications. The following chart (not included here) outlines the nominal weights and permissible OD deviations for each grade.
Dimensions of AS 1074 Steel Tubes - Light
|
Nominal size
|
Outside diameter
mm
|
Thickness
mm
|
Mass of black tube
kg/m
|
|
min
|
max
|
Plain or screwed ends
|
Screwed and socketed
|
|
DN 8
|
13.2
|
13.6
|
1.8
|
0.515
|
0.519
|
|
DN 10
|
16.7
|
17.1
|
1.8
|
0.67
|
0.676
|
|
DN 15
|
21.0
|
21.4
|
2.0
|
0.947
|
0.956
|
|
DN 20
|
26.4
|
26.9
|
2.3
|
1.38
|
1.39
|
|
DN 25
|
33.2
|
33.8
|
2.6
|
1.98
|
2.00
|
|
DN 32
|
41.9
|
42.5
|
2.6
|
2.54
|
2.57
|
|
DN 40
|
47.8
|
48.4
|
2.9
|
3.23
|
3.27
|
|
DN 50
|
59.6
|
60.2
|
2.9
|
4.08
|
4.15
|
|
DN 65
|
75.2
|
76.0
|
3.2
|
5.71
|
5.83
|
|
DN 80
|
87.9
|
88.7
|
3.2
|
6.72
|
6.89
|
|
DN 100
|
113.0
|
113.9
|
3.6
|
9.75
|
10.0
|
Dimensions of AS 1074 Steel Tubes - Medium
|
Nominal size
|
Outside diameter
mm
|
Thickness
mm
|
Mass of black tube
kg/m
|
|
min
|
max
|
Plain or screwed ends
|
Screwed and socketed
|
|
DN 8
|
13.3
|
13.9
|
2.3
|
0.641
|
0.645
|
|
DN 10
|
16.8
|
17.4
|
2.3
|
0.839
|
0.845
|
|
DN 15
|
21.1
|
21.7
|
2.6
|
1.21
|
1.22
|
|
DN 20
|
26.6
|
27.2
|
2.6
|
1.56
|
1.57
|
|
DN 25
|
33.4
|
34.2
|
3.2
|
2.41
|
2.43
|
|
DN 32
|
42.1
|
42.9
|
3.2
|
3.10
|
3.13
|
|
DN 40
|
48.0
|
48.8
|
3.2
|
3.57
|
3.61
|
|
DN 50
|
59.8
|
60.8
|
3.6
|
5.03
|
5.10
|
|
DN 65
|
75.4
|
76.6
|
3.6
|
6.43
|
6.55
|
|
DN 80
|
88.1
|
89.5
|
4.0
|
8.37
|
8.54
|
|
DN 100
|
113.3
|
114.9
|
4.5
|
12.2
|
12.5
|
|
DN 125
|
138.7
|
140.6
|
5.0
|
16.6
|
17.1
|
|
DN 150
|
164.1
|
166.1
|
5.0
|
19.7
|
20.3
|
Dimensions of AS 1074 Steel Tubes - Heavy
|
Nominal size
|
Outside diameter
mm
|
Thickness
mm
|
Mass of black tube
kg/m
|
|
min
|
max
|
Plain or screwed ends
|
Screwed and socketed
|
|
DN 8
|
13.3
|
13.9
|
2.9
|
0.765
|
0.769
|
|
DN 10
|
16.8
|
17.4
|
2.9
|
1.02
|
1.03
|
|
DN 15
|
21.1
|
21.7
|
3.2
|
1.44
|
1.45
|
|
DN 20
|
26.6
|
27.2
|
3.2
|
1.87
|
1.88
|
|
DN 25
|
33.4
|
34.2
|
4.0
|
2.94
|
2.96
|
|
DN 32
|
42.1
|
42.9
|
4.0
|
3.80
|
3.83
|
|
DN 40
|
48.0
|
48.8
|
4.0
|
4.38
|
4.42
|
|
DN 50
|
59.8
|
60.8
|
4.5
|
6.19
|
6.26
|
|
DN 65
|
75.4
|
76.6
|
4.5
|
7.93
|
8.05
|
|
DN 80
|
88.1
|
89.5
|
5.0
|
10.3
|
10.5
|
|
DN 100
|
113.3
|
114.9
|
5.4
|
14.5
|
14.8
|
|
DN 125
|
138.7
|
140.6
|
5.4
|
17.9
|
18.4
|
|
DN 150
|
164.1
|
166.1
|
5.4
|
21.3
|
21.9
|
Dimensional Tolerance of AS 1074 Steel Pipes
|
Thickness
|
Light welded tubes
|
min 92%
|
|
Medium and heavy welded tubes
|
min 90%
|
|
Medium and heavy Seamless tubes
|
min 87.5%
|
|
Mass
|
total length≥150 m
|
±4%
|
|
One steel pipe
|
92% - 110%
|
|
lengths
|
Standard lengths
|
6.50 ±0.08 m
|
|
Exact lengths
|
0 - +8 mm
|
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