ERW pipe grade and specification

ERW pipes are widely used in various industries for transporting fluids and gases such as oil and natural gas as well as structural applications, and can meet various high and low pressure requirements. These pipes are known for their high strength, durability, and cost-effectiveness, making them a popular choice for a variety of applications. Below we will explore the grades and specifications of ERW steel pipe to fully understand its properties.

ERW pipe steel grade:
ERW pipe is available in a variety of grades to meet the different requirements of different applications. Selecting the appropriate grade depends on factors such as intended use, operating conditions and environmental factors. Some common ERW steel pipe grade standards include:

(1) ASTM A53 Grade A/B

This grade is widely used in general structural and pressure applications. It is suitable for welding, bending and flanging and is suitable for various construction and engineering purposes.

(2) API 5L GR.B/X42
API 5L is a standard specification for line pipes that specifies the manufacturing process, chemical composition, mechanical properties and other requirements for seamless pipes and welded steel pipes. API 5L GR.B and X42 are commonly used in the natural gas and oil industries to transport gas, water and oil. In addition, ERW line pipes include X46, X52, X56, X60, X65, X70, etc.

(3) ASTM A135
This specification covers two grades of electric resistance welded steel pipe used for conveying gas, steam, water, or other liquids. It is commonly used in fire sprinkler systems due to its high corrosion resistance and pressure resistance.

(4) ASTM A178

ASTM A178 is widely used as a grade for ERW boiler tubes and heat exchanger tubes. It has good surface quality and excellent mechanical properties, making it suitable for high temperature and high pressure applications.

(5) EN10217-1
This European Standard specifies the requirements for longitudinally welded steel pipes for pressure. Including P195, P235, P265 and other grades, suitable for different pressure levels and temperatures.

Specifications of ERW pipe:
Specifications for ERW pipes cover a wide range of parameters that define their physical, chemical and mechanical properties. These specifications are critical to ensuring that pipes meet required standards and performance standards. Some key specifications of ERW steel pipe include:

(1) Size range
ERW pipe is available in a variety of sizes, typically ranging from 1/2 inch to 24 inches in diameter. Depending on application requirements, wall thickness can range from standard wall thickness to extra-thick wall thickness.

(2) Material composition
The material composition of ERW pipes is specifically specified to ensure the required mechanical properties and corrosion resistance. Commonly used materials include carbon steel, stainless steel, and alloy steel, with special emphasis on the chemical composition of the base metal and any other elements added to enhance performance.

(3) Surface treatment
The surface finish of ERW pipes is specifically specified to ensure smoothness, uniformity and freedom from defects. This includes parameters such as scale, pits and laminations, which affect the overall performance and appearance of the pipe.

(5) Testing and inspection
ERW pipe codes include provisions for testing and inspection to verify compliance with specified requirements. This may involve non-destructive testing methods such as ultrasonic testing, electromagnetic testing or hydrostatic testing to assess the quality and integrity of the weld and base metal.

(6) End surface treatment

The specification also details the type of end processing allowed for ERW pipe, such as plain, beveled, or threaded ends, depending on the intended installation and connection mode.

Go here to learn more: SAW vs ERW and EFW Welded Steel Pipe