Seamless steel pipe is a steel pipe made by heating a solid steel billet at high temperature and then processing it through perforation, rolling and other processes. Its notable feature is that it has no welding seams and has a continuous tubular structure as a whole.

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Description

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Schedule 40 steel pipe is the most commonly used pipe schedule. It can be galvanized — although it doesn’t have to be — and is usually used in water and gas lines. It may also appear in places that need ornamentation or support.

It makes a great pipe due to its versatility and performance strength.

This steel pipe product comes in a variety of dimensions. The size of the pipe, its nominal diameter, actual inside diameter, and actual outside diameter all fit within the right parameters.

For example, a schedule 40 pipe that’s 2.5 inches in diameter will be 2.469 in actual inside diameter and 2.875 in actual outside diameter.

Many industries use SCH 40 steel pipe, especially industries that need to supply air, gas, and water at high temperatures. This schedule pipe also sees a lot of use in construction work where its diameter, strength, and reactivity make it a reliable choice.

schedule 40 pipe’s primary application is transporting high-temperature, high-pressure liquids for commercial and residential properties in the oil and gas industry.

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FAQ

1. Q: What is the difference between seamless pipes and welded pipes?

Structure: Seamless pipes have no welds, and welded pipes have longitudinal or spiral welds;

Strength: Seamless pipes have higher overall strength and are suitable for high-pressure scenarios (such as boilers and hydraulic systems);

Cost: The production process of seamless pipes is complex, and the price is 10%-30% higher than that of welded pipes.

2. Q: How to choose the material of seamless pipe?

General environment: choose Q235 or 20# carbon steel (low cost, easy to process);

Corrosive environment: choose 304/316L stainless steel or galvanized seamless pipe;

High temperature and high pressure: choose 15CrMo, 12Cr1MoV and other alloy pipes (specific temperature and pressure parameters must be provided).

3. Q: Can the size of seamless pipe be customized?

Regular specifications (outer diameter 6-630mm, wall thickness 0.5-50mm) can be customized in length (such as fixed length 6m, 9m);

Special caliber or wall thickness requires mold production, the minimum order quantity is higher (usually ≥5 tons), and the delivery time is extended by 2-4 weeks.

4. Q: How to detect the quality of seamless pipes?

Answer:

Appearance: no cracks, folds, or scars on the surface, and uniform wall thickness;

Non-destructive testing: ultrasonic (UT) and eddy current (ET) detection of internal defects;

Pressure test: water pressure test (such as water pressure 10MPa, pressure maintenance for 5 minutes without leakage).

5. Q: How to prevent rust during transportation of seamless pipes?

Answer:

Short-term transportation: can be naked in dry environment, and covered with waterproof cloth in humid environment;

Long-term storage: stored in a dry warehouse, ≥20cm from the ground, regularly check the surface rust, and re-oil if necessary.

Black Surface Seamless Carbon Steel Tube for Q195-Q345 Grade