Carbon steel ERW steel pipe specification

When selecting carbon steel Electric Resistance Welded (ERW) steel pipes, it's essential to consider various specifications to ensure they meet the requirements of your application. Here are key specifications typically associated with carbon steel ERW pipes.

1. Standard Specifications

API 5L: Specifies requirements for line pipe used in the oil and gas industry, covering both seamless and welded pipes.

ASTM A53: Covers black and hot-dipped galvanized welded and seamless steel pipes for mechanical and pressure applications.

ASTM A500: Covers cold-formed welded and seamless carbon steel structural tubing in round, square, and rectangular shapes.

2. Material Grades

Common grades for carbon steel ERW pipes include:

Grade A: Suitable for low-pressure applications.

Grade B: Higher strength and widely used in oil and gas applications.

X42, X52, X60, X65: Higher-grade options with enhanced mechanical properties for high-pressure pipelines.

3. Dimensions

Nominal Pipe Size (NPS): Typically ranges from 1/2 inch to 24 inches and larger, depending on the application.

Wall Thickness: Varies based on pressure requirements, commonly from schedule 10 to schedule 160 (e.g., Sch 40, Sch 80).

4. Mechanical Properties

Yield Strength: Generally ranges from 35,000 psi (Grade A) to 65,000 psi (Grade X65).

Tensile Strength: Typically ranges from 58,000 psi to 80,000 psi depending on the grade.

Elongation: Varies based on thickness but generally ranges from 20% to 30%.

5. Chemical Composition

Carbon (C): Usually up to 0.26% for most grades.

Manganese (Mn): Typically ranges from 0.60% to 1.65%.

Phosphorus (P): Maximum of 0.04% for structural grades.

Sulfur (S): Maximum of 0.05%.

6. Coating Options

Galvanized: Hot-dipped for corrosion resistance.

Polyethylene or Epoxy: For additional protection in corrosive environments.

7. Testing and Inspection

Hydrostatic Testing: To ensure the pipe can withstand internal pressure.

Non-Destructive Testing (NDT): Methods such as ultrasonic testing or radiographic inspection to check weld integrity.

8. Applications

Suitable for transporting fluids in oil and gas pipelines, construction, and structural applications.