Black steel pipe Sch 40 is one of the most widely used types of carbon steel pipe in construction, plumbing, and industrial systems.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.
Schedule 40 designation represents a balanced wall thickness that supports moderate pressure while maintaining an affordable cost. Known for its strength and versatility, it is ideal for gas, water, and steam transportation, as well as structural and mechanical applications.Contact us anytime Email : pipe@stpipefitting.cn.
Standard Specifications of Small-Diameter Seamless Steel Pipes
EN 10220 Seamless and Welded Steel Pipes
Material and Size of Galvanized Pipe Complete Guide
How to Calculate Steel Pipe Weight: Complete Formula
