Carbon steel ERW pipe specification

When selecting Carbon Steel ERW (Electric Resistance Welded) Pipes, it’s crucial to consider various specifications to ensure they meet your application’s needs. Below are the key specifications typically associated with these pipes.

Standard Specifications

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

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

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

Material Grades
Common grades for carbon steel ERW pipes include:

Grade A: Suitable for low-pressure applications.

Grade B: Offers higher strength, widely used in oil and gas applications.

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

Dimensions

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

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

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, generally ranging from 20% to 30%.

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%.

Coating Options

Galvanized: Hot-dipped for enhanced corrosion resistance.

Polyethylene or Epoxy: Provides additional protection in corrosive environments.

Testing and Inspection

Hydrostatic Testing: Ensures the pipe can withstand internal pressure.

Non-Destructive Testing (NDT): Methods like ultrasonic testing or radiographic inspection assess weld integrity.

Applications
Ideal for transporting fluids in oil and gas pipelines, as well as in construction and structural applications.