Choosing the right black steel pipe is essential to ensure both safety and efficiency in any project. Professionals often rely on dimension charts to easily select the appropriate pipe size. By understanding key parameters such as diameter, wall thickness, and weight, you can effectively prevent fitting issues in construction or industrial applications.
This comprehensive guide covers everything you need to know about black steel pipe sizes, featuring a clear size chart and simple examples to help you choose the most suitable pipe for your specific project.
What Is a Black Steel Pipe?
A black steel pipe is made from carbon steel and is not galvanized, giving it a distinctive dark finish formed by an iron oxide coating. This natural layer provides basic corrosion resistance and strength. Due to its high durability and affordability, black steel pipe is widely used in gas lines, fire sprinkler systems, and structural frameworks. Compared with galvanized pipes, it offers better strength and cost-effectiveness, making it a popular choice in industrial and construction fields.
Applications of Black Steel Pipes
Thanks to their high tensile strength and low maintenance requirements, black steel pipes are used in a wide range of applications:
Gas and water transportation systems in both rural and urban areas
Pipelines for high-pressure steam and air in industrial facilities
Protective conduits for electrical wiring
Oil and petroleum pipelines, particularly for long-distance transport through remote areas
Other common uses include gas distribution networks, water wells, and sewage systems. However, black steel pipes are not used for drinking water, as their internal surfaces can corrode over time, leading to mineral buildup and potential contamination.
ASTM Black Steel Pipe
ASTM black steel pipes are produced in accordance with ASTM international standards, ensuring high strength, excellent durability, and consistent corrosion resistance. They are widely applied in gas pipelines, water transport systems, and building structures. With precise dimensions, stable mechanical performance, and reliable pressure-bearing capacity, ASTM black steel pipes deliver dependable performance for a variety of industrial and construction projects.
Black Steel Pipe Specification Table
|
Specification
|
Outer Diameter (mm)
|
Inner Diameter (mm)
|
Wall Thickness (mm)
|
Specification
|
Outer Diameter (mm)
|
Inner Diameter (mm)
|
Wall Thickness (mm)
|
|
Black Pipe A 1/2"
|
21.4
|
18.2
|
1.5
|
Black Pipe B 1/2"
|
21.4
|
16.8
|
2.3
|
|
Black Pipe A 3/4"
|
26.7
|
23.7
|
1.5
|
Black Pipe B 3/4"
|
26.7
|
21.5
|
2.6
|
|
Black Pipe A 1"
|
34
|
30
|
2
|
Black Pipe B 1"
|
34
|
28.4
|
2.8
|
|
Black Pipe A 1 1/4"
|
42.7
|
38.1
|
2.3
|
Black Pipe B 1 1/4"
|
42.7
|
36.3
|
3.2
|
|
Black Pipe A 1 1/2"
|
48.6
|
44.6
|
2
|
Black Pipe B 1 1/2"
|
48.6
|
41.4
|
3.6
|
|
Black Pipe A 2"
|
60.5
|
56.5
|
2
|
Black Pipe B 2"
|
60.5
|
53.3
|
3.6
|
|
Black Pipe A 2 1/2"
|
76.3
|
71.7
|
2.3
|
Black Pipe B 2 1/2"
|
76.3
|
68.3
|
4
|
|
Black Pipe A 3"
|
89
|
84.4
|
2.3
|
Black Pipe B 3"
|
89
|
81
|
4
|
|
Black Pipe A 3 1/2"
|
101.6
|
97
|
2.3
|
Black Pipe B 3 1/2"
|
101.6
|
93.6
|
4
|
|
Black Pipe A 4"
|
114.3
|
109.7
|
2.3
|
Black Pipe B 4"
|
114.3
|
106.3
|
4
|
|
Black Pipe A 5"
|
139.8
|
133.8
|
3
|
Black Pipe B 5"
|
139.8
|
131.8
|
4
|
|
Black Pipe A 6"
|
165
|
159
|
3
|
Black Pipe B 6"
|
165
|
157
|
4
|
|
Black Pipe A 8"
|
216.3
|
208.3
|
4
|
Black Pipe B 8"
|
216.3
|
205.3
|
5.5
|
|
—
|
—
|
—
|
—
|
Black Pipe B 10"
|
267
|
256
|
5.5
|
|
—
|
—
|
—
|
—
|
Black Pipe B 10"
|
273
|
262
|
5.5
|
For more: Carbon steel pipe sizes
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