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Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
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In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
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Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
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Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
1. What Is SCH 40 Mild Steel Pipe
SCH 40 mild steel pipe refers to low-carbon steel pipe manufactured with a Schedule 40 wall thickness in accordance with ASME B36.10M.
In this designation, SCH 40 defines the pipe wall thickness, while mild steel refers to the material category. Because mild steel contains relatively low carbon content, it offers good weldability, formability, and cost efficiency for general piping and structural applications.
Typical SCH 40 mild steel pipe products are supplied to standards such as ASTM A53 Grade B and are widely used in utility piping, water distribution systems, fabrication projects, and industrial facilities.
In many industrial markets, the terms mild steel pipe, MS pipe, and low-carbon steel pipe are often used interchangeably to describe general-purpose carbon steel piping products.
| Grade | Standard | Typical Service |
|---|---|---|
| ASTM A53 Gr.B | ASTM A53 | Water, gas and general piping |
| ASTM A106 Gr.B | ASTM A106 | High-temperature and pressure service |
| API 5L Gr.B | API 5L | Oil and gas pipeline transportation |
Among these grades, ASTM A53 Grade B is generally regarded as the most common mild steel pipe specification for industrial and commercial applications.
| Item | Typical Specification |
|---|---|
| Material Type | Low Carbon Steel |
| Common Grade | ASTM A53 Gr.B |
| Wall Thickness | Schedule 40 |
| Manufacturing Method | ERW or Seamless |
| Standard | ASTM A53 / ASTM A106 / API 5L |
| End Type | Plain End, Beveled End, Threaded |
| Surface | Black, Painted, Galvanized |
| Typical Length | 6m, 12m, Random Length |
In international pipe standards, SCH 40 mild steel pipe is most commonly supplied as ASTM A53 Grade B carbon steel pipe, available in both welded and seamless forms.
SCH 40 mild steel pipe can be manufactured as either seamless pipe or welded pipe, depending on the project requirements and applicable specification.
| Item | Seamless Pipe | Welded Pipe |
|---|---|---|
| Manufacturing Method | Pierced from solid billet | Formed and welded from steel strip |
| Pressure Capability | Higher | Moderate |
| Cost | Higher | Lower |
| Dimensional Consistency | Good | Excellent |
| Availability | Common | Very common |
| Typical Standards | ASTM A106 | ASTM A53 |
In practice, welded SCH 40 mild steel pipe is more commonly used for general utility and fabrication work, while seamless pipe is often specified when project requirements call for higher pressure or temperature performance.
Although SCH 40 pipe is available in a wide range of nominal pipe sizes (NPS), several sizes are more commonly specified for general piping and fabrication projects.
| NPS | OD (mm) | Wall Thickness (mm) |
|---|---|---|
| 1" | 33.4 | 3.38 |
| 2" | 60.3 | 3.91 |
| 4" | 114.3 | 6.02 |
| 6" | 168.3 | 7.11 |
| 8" | 219.1 | 8.18 |
| 12" | 323.8 | 10.31 |
The sizes above represent some of the most commonly used SCH 40 pipe dimensions. For a complete dimensions and wall thickness chart, refer to our Schedule 40 Seamless Pipe Dimensions guide.
Common applications include:
1) Water distribution systems
2) Utility and service piping
3) Structural fabrication
4) Mechanical equipment frames
5) Fire protection systems
6) Low-pressure industrial piping
Its combination of strength, weldability, and cost efficiency makes it a practical choice for a wide range of industrial and commercial projects.
Q1. What is MS pipe schedule 40?
MS pipe schedule 40 refers to mild steel pipe manufactured with a Schedule 40 wall thickness according to ASME B36.10M. In this designation, "MS" stands for mild steel, while "Schedule 40" defines the pipe wall thickness and dimensions.
Q2. Is SCH 40 mild steel pipe the same as carbon steel pipe?
Mild steel pipe is generally considered a type of carbon steel pipe with relatively low carbon content. In many industrial applications, the terms mild steel pipe and low-carbon steel pipe are used interchangeably. However, carbon steel is a broader category that also includes medium-carbon and high-carbon steels.
Q3. What grades are commonly used for SCH 40 mild steel pipe?
Common grades include ASTM A53 Grade B, ASTM A106 Grade B, and API 5L Grade B. Among these, ASTM A53 Grade B is one of the most widely used specifications for general-purpose mild steel piping.
Q4. What is the yield strength of SCH 40 mild steel pipe?
The yield strength depends on the material grade. For ASTM A53 Grade B, the minimum yield strength is 35,000 psi (240 MPa), while the minimum tensile strength is 60,000 psi (415 MPa).
Q5. Is SCH 40 pipe seamless or welded?
SCH 40 only specifies the wall thickness of the pipe and does not define the manufacturing method. SCH 40 pipe may be supplied as either seamless pipe or welded pipe depending on the applicable standard and project requirements.
Q6. Can SCH 40 mild steel pipe be galvanized?
Yes. SCH 40 mild steel pipe can be hot-dip galvanized to improve corrosion resistance. Galvanized SCH 40 pipe is commonly used in water distribution systems, outdoor installations, structural applications, and utility piping.
Read more:
SCH 40 Carbon Steel Pipe: Grades, Properties and Chemical Composition
Schedule 40 Seamless Pipe Dimensions, Wall Thickness and Pressure Rating
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