What Is Black Steel Pipe Sch 40?
The term Schedule 40 defines the pipe’s wall thickness. As the inside diameter increases, the wall thickness also increases proportionally. This ensures consistent pressure capacity across different pipe sizes.Black steel pipes are made from ungalvanized carbon steel with a dark iron oxide coating that offers basic corrosion resistance. They are commonly available in enameled black coating, galvanized, or smooth uncoated A500 Grade B finishes.
Specifications of Seamless Black Steel Pipe Schedule 40:
|
Nominal size [inches] |
Outside diameter [inches] |
Outside diameter [mm] |
Wall thickness [inches] |
Wall thickness [mm] |
Weight [lb/ft] |
Weight [kg/m] |
|
1/8 |
0.405 |
10.3 |
0.068 |
1.73 |
0.24 |
0.37 |
|
1/4 |
0.540 |
13.7 |
0.088 |
2.24 |
0.42 |
0.84 |
|
1/2 |
0.840 |
21.3 |
0.109 |
2.77 |
0.85 |
1.27 |
|
3/4 |
1.050 |
26.7 |
0.113 |
2.87 |
1.13 |
1.69 |
|
1 |
1.315 |
33.4 |
0.133 |
3.38 |
1.68 |
2.50 |
|
1 1/4 |
1.660 |
42.2 |
0.140 |
3.56 |
2.27 |
3.39 |
|
1 1/2 |
1.900 |
48.3 |
0.145 |
3.68 |
2.72 |
4.05 |
|
2 |
2.375 |
60.3 |
0.154 |
3.91 |
3.65 |
5.44 |
|
2 1/2 |
2.875 |
73.0 |
0.203 |
5.16 |
5.79 |
8.63 |
|
3 |
3.500 |
88.9 |
0.216 |
5.49 |
7.58 |
11.29 |
|
3 1/2 |
4.000 |
101.6 |
0.226 |
5.74 |
9.11 |
13.57 |
|
4 |
4.500 |
114.3 |
0.237 |
6.02 |
10.79 |
16.07 |
|
5 |
5.563 |
141.3 |
0.258 |
6.55 |
14.62 |
21.77 |
|
6 |
6.625 |
168.3 |
0.280 |
7.11 |
18.97 |
28.26 |
|
8 |
8.625 |
219.1 |
0.322 |
8.18 |
28.55 |
42.55 |
|
10 |
10.750 |
273.0 |
0.365 |
9.27 |
40.48 |
60.31 |
|
12 |
12.750 |
323.8 |
0.406 |
10.31 |
53.52 |
79.73 |
|
14 |
14 |
355.6 |
0.375 |
11.13 |
54.57 |
94.55 |
|
16 |
16 |
406.4 |
0.500 |
12.70 |
82.77 |
123.30 |
|
18 |
18 |
457.0 |
0.562 |
14.27 |
104.67 |
155.80 |
|
20 |
20 |
508.0 |
0.594 |
15.09 |
123.11 |
183.42 |
|
24 |
24 |
610.0 |
0.688 |
17.48 |
171.29 |
255.41 |
|
32 |
32 |
813.0 |
0.688 |
17.48 |
230.08 |
342.91 |
Material and Coating Options
Enameled Black Coating: Provides resistance against moisture and corrosion.Galvanized Finish: Adds extra protection for outdoor or high-humidity environments.
Uncoated Smooth Finish (A500 Grade B): Suitable for welding, structural frames, and bollard use.
Competitive Metals and other suppliers offer Schedule 40 pipes in 21’ stock lengths, typically ranging from ½” to 10” inner diameter, with options to purchase custom cut lengths.
Applications of Black Steel Pipe Sch 40
Seamless black steel pipes with Schedule 40 walls are widely used in:Water and gas transportation in urban and rural systems
High-pressure air and steam distribution
Oil and petroleum pipelines in remote industrial areas
Fire protection and sprinkler systems
Structural supports and bollards
Conduits for electrical wiring
Water well and sewage construction
