What is Schedule 40 Seamless Black Steel Pipe?
Schedule 40 seamless black steel pipe is a high-strength, durable, and versatile pipe used across various industries. It is made of carbon steel and features a black oxide coating, which enhances its corrosion resistance while eliminating the need for galvanization.Unlike welded pipes, seamless black steel pipes have no weld seams, making them stronger, more reliable, and resistant to pressure variations. These characteristics make Schedule 40 seamless black steel pipes ideal for structural, industrial, and fluid transportation applications.Schedule 40 seamless black steel pipe is an essential component in industrial and commercial piping systems. Known for its high strength, durability, and versatility, this type of pipe is widely used in industries such as construction, oil and gas, manufacturing, and fire protection systems.As a leading steel pipe manufacturer, we specialize in providing high-quality Schedule 40 seamless black steel pipes for global B2B customers. Whether you are involved in building infrastructure, transporting oil and gas, or manufacturing industrial equipment, our pipes deliver reliable performance in various applications.This article will explore the specifications, advantages, and applications of Schedule 40 seamless black steel pipe, helping you understand why it remains the preferred choice for industrial piping systems.
Schedule 40 Seamless Black Steel Pipe meaning
Schedule 40 Seamless Black Steel Pipe refers to a type of pipe that is made from carbon steel and has a medium wall thickness, identified as "Schedule 40." This pipe is manufactured without welding seams, using a process where a solid billet of steel is pierced and extruded into a tube, resulting in a smooth and strong pipe that does not have welded joints. The "black" designation refers to the uncoated surface of the pipe, which has a natural dark finish due to the manufacturing process.
Specifications of Schedule 40 Seamless Black Steel Pipe
|
Specification
|
Details
|
|
Material
|
Carbon Steel
|
|
Manufacturing Process
|
Seamless (no weld seams)
|
|
Surface Coating
|
Black oxide layer for corrosion resistance
|
|
Wall Thickness
|
Standard Schedule 40 thickness
|
|
Pressure Rating
|
Suitable for medium to high-pressure applications
|
|
Size Range
|
NPS 1/8" to 24"
|
|
Standards
|
ASTM A53, ASTM A106, API 5L
|
Standards & Certifications
Schedule 40 seamless black steel pipes comply with multiple international industry standards, including:
ASTM A53 – Standard specification for seamless and welded steel pipes
ASTM A106 – Standard for seamless carbon steel pipes for high-temperature service
API 5L – Specification for pipeline transportation systems
ASME B36.10M – Standard for welded and seamless steel pipes
ISO 9001 – Quality management system certification
Key Features of Schedule 40 Seamless Black Steel Pipe
Seamless Construction – No welds, ensuring higher strength and leak resistance.
High Pressure Resistance – Designed for medium to high-pressure applications.
Corrosion Protection – Black oxide coating prevents rust and oxidation.
Long Lifespan – Withstands harsh environments and extreme temperatures.
Versatile Applications – Used in industrial, structural, and fluid transportation systems.
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
|
Applications of Schedule 40 Seamless Black Steel Pipe
1. Oil & Gas Industry
Used in pipelines for transporting oil, gas, and other fluids.
Can withstand high pressure and harsh environmental conditions.
2. Construction & Infrastructure
Used for structural support, scaffolding, and building frameworks.
Provides strength and stability in large-scale projects.
3. Pipeline & Water Systems
Commonly used in water supply and drainage systems.
Corrosion-resistant properties ensure long-term performance.
4. Manufacturing & Machinery
Used in the production of industrial machinery and equipment.
Suitable for high-pressure steam and hydraulic systems.
5. Fire Protection Systems
Ideal for sprinkler systems and fire protection pipelines.
Meets safety standards for fire suppression applications.
Conclusion
Schedule 40 seamless black steel pipes are a reliable and versatile solution for various industrial applications. Their high strength, durability, and cost-effectiveness make them a preferred choice in the oil and gas, construction, and manufacturing industries.
As a leading steel pipe manufacturer, we are dedicated to providing high-quality Schedule 40 seamless black steel pipes to meet the needs of B2B customers worldwide. Whether you need standard sizes or custom solutions, we have the expertise and resources to fulfill your requirements.
Looking for high-quality Schedule 40 seamless black steel pipes?
Baowi Steel offers premium-grade steel pipes that meet international standards. Contact us today for the best steel piping solutions!
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