Differences Between JCOE and ERW Steel Pipes

Summary

Straight seam submerged arc JCOE welded steel pipes and high-frequency ERW steel pipes are distinct in their welding and molding processes, production ranges, materials, and applications. This article explores these differences in detail, offering insights into their unique characteristics and uses. Learn about the nuances of each type, supported by industry standards and data.

Welding Processes

Submerged Arc Welding (SAW)

Submerged arc welding (SAW) involves using a molten filler wire and plate to create the weld seam. The process is characterized by the use of granular flux, which covers the weld area, protecting it from contaminants and controlling the cooling rate. This method is particularly effective for producing large-diameter pipes with thick walls.

High-Frequency Welding (HFW)

High-frequency welding (HFW) utilizes the skin effect of high-frequency currents to rapidly heat the edges of the steel plate, causing them to melt. Under external pressure, the molten edges fuse together, forming a weld that is integral to the parent metal. This process is efficient for producing smaller diameter pipes with thinner walls.

Molding Processes

JCOE Molding

The JCOE molding process involves successive stamping of the steel plate using a press with a force of thousands of tons. The steel plate undergoes a cold forming process, gradually taking the shape of a pipe. This method is suitable for producing large-diameter pipes with precise dimensions.

FXH Molding

In the FXH molding process, the steel plate is gradually formed into a circular pipe using rollers. This method is efficient for producing smaller diameter pipes and is commonly used in high-frequency welding.

Production Ranges

Production Materials

Submerged Arc Welding (SAW)

SAW can produce pipes from a wide range of materials, including high-strength steels. The process adheres to standards such as API 5L and ISO 3183, ensuring high-quality welds suitable for demanding applications.

High-Frequency Welding (HFW)

HFW is typically used for producing pipes from pipeline steel grades such as L245, L485, X42, and X80. These pipes meet standards like API 5L and ISO 3183, making them suitable for various industrial applications.

Applications

Submerged Arc Welding (SAW)

SAW pipes are used in large-diameter oil and gas transmission pipelines, steel pipe piles, and structural applications. Their ability to handle high pressures and harsh environments makes them ideal for these uses.

High-Frequency Welding (HFW)

HFW pipes are used in space truss structures, small fluid tubes, wire and tube applications, and basic structural components. Their smooth finish and precise dimensions make them suitable for these applications.

Appearance Differences

One of the most noticeable differences between SAW and HFW pipes is their appearance. HFW pipes have a smooth, grey finish with no visible weld seams, while SAW pipes may have microscopic bar-type indentations and slight oxidation on the surface.

Industry Standards

Hunan Great Steel Pipe Co., Ltd. produces a wide range of steel pipes, adhering to standards such as GB/T3091-2001, ASTM A53, ASTM A500, DIN, and EN 10255/10240. Their products include LSAW steel pipes, galvanized straight seam steel pipes, and heat-expanded straight steel tubes.

Interesting Stats

• The global market for welded steel pipes is projected to reach $86.5 billion by 2027, growing at a CAGR of 5.4% from 2020 to 2027 (source).
• High-frequency welding can achieve welding speeds of up to 30 meters per minute, making it one of the fastest welding processes in the industry (source).

By understanding the differences between JCOE and ERW steel pipes, industry professionals can make informed decisions about which type of pipe is best suited for their specific applications.