Seamless black steel pipe schedule 40

Seamless black steel pipe is made up of steel that has not being galvanized. Its name comes from the skin, dark-colored iron oxide coating on its surface. It is used in applications that does not requires galvanized steels.

Black steel pipe's strength makes it ideal for transporting water and gas in rural and urban areas and for conduits that protect electrical wiring and for delivering high pressure steam and air. The oil and petroleum industries use black steel pipe for moving large quantities of oil through remote areas. This is beneficial, since black steel pipe requires very little maintenance. Other uses for black steel pipes include gas distribution inside and outside homes, water wells and sewage systems. 

Features of seamless black steel pipe schedule 40

1. Material

Low-carbon steel (carbon content ≤ 0.25%, such as ASTM A53 Gr.B and Q235B).

2. Wall Thickness

SCH 40 offers a medium wall thickness, balancing pressure-bearing capacity and cost.

3. Surface Finish

Dark gray/black, retaining the natural oxide layer after rolling.

4. Dimensional Parameters

Outer diameter and wall thickness (WT) should be consulted according to specific standards (such as the ANSI B36.10 steel pipe size table). Different pipe diameters correspond to different wall thicknesses.

5. Applications

Primarily used for conveying fluids such as oil, gas, and water, meeting certain pressure-bearing and corrosion-resistant requirements.

Advantages of seamless black steel pipe schedule 40

1. Cost-Effectiveness

The price of SCH 40 wall thickness is 20%-30% lower than SCH 80 black steel pipe and 40% lower than galvanized pipe.

2. Easy to Process

Mild carbon steel has good ductility and is easy to cut and weld.

3. Reliable Strength

Meets most low-pressure fluid and structural requirements.

Specification chart of seamless black steel pipe schedule 40

Application of seamless black steel pipe schedule 40

1. Low and middle pressure fluid pipeline

2. Casing Pipe

3. Boiler Pipe

4. Petroleum and natural gas industry

5. Chemistry industry

6. Electric industry

Usage restrictions of seamless black steel pipe schedule 40

1. Direct Use Prohibited

Drinking water systems (sanitary conditions not qualified)

Acidic/alkaline media transportation

Coastal or high-humidity outdoor environments (unprotected, service life less than 3 years)

2. Corrosion Protection Options

Outdoor use: epoxy coal tar coating (extended service life to 10 years)

Underground installation: 3pe anti-corrosion coating

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