ASTM A795 ERW pipes are electric resistance welded pipes manufactured according to the standards set by ASTM International. These pipes are specifically designed for fire protection systems and meet strict quality and performance criteria.

To accurately identify the tempering temperature during the heat treatment of seamless steel pipes, the tempering temperature can be determined by observing the tempering color. The tempering color changes with temperature, and these variations differ based on the material being treated. Below is a breakdown provided by experts.

The impact toughness of high-pressure seamless pipes represents the material's resistance to external impact loads, typically measured by the impact energy (Ak) in Joules (J). This article will briefly introduce impact toughness of high pressure seamless pipe.

The ASTM A53 standard specifies the chemical composition and mechanical properties of seamless steel pipes, commonly used for mechanical and pressure applications, as well as for steam, water, and gas transportation.

This article will briefly introduce ASTM A210-standard specification for seamless boiler and superheater tubes.

Submerged arc welding (SAW) is a process where the arc burns under a layer of flux. Submerged arc welded pipes primarily include straight seam submerged arc welded pipes (LSAW) and spiral submerged arc welded pipes (SSAW). Below are the main defects commonly seen in the weld appearance of SAW pipes.

Seamless steel pipes are used in various industries, and their characteristics vary based on their intended applications. Here are the key characteristics of seamless steel pipes for different purposes.

A spiral steel pipe (SSAW steel pipe) is a welded pipe produced by rolling a strip of low-carbon structural steel or low-alloy structural steel into a tubular shape at a specific helical angle (referred to as the forming angle), and then welding the seams. Different types of spiral welded pipes require different cutting methods, and the cutting methods for thick-walled spiral welded pipes are as follows.

In recent years, with the growth of the national economy, thick-walled LSAW steel pipes have found widespread use in offshore platforms, high-temperature and high-pressure vessels, and wind power pipe piles. These steel pipes are typically made from materials such as D36 steel, S355 steel, and structural steel plates with Z-direction properties. Due to the large thickness, high carbon content, and high carbon equivalent of these plates, their weldability is poor, and they exhibit a tendency for high hardenability. This compromises the joint welding performance and makes cold cracks, particularly transverse cracks, more likely to form. When welding cracks do occur, along with the necessary control measures, it is crucial to repair the affected areas promptly. Below is an example of repair steps for transverse cracks in S355 steel welding.

ASTM A333 specifies seamless and welded carbon and alloy steel pipes designed for low-temperature applications. These pipes are manufactured using either the seamless or welding process, with no filler metal added during welding. To ensure the desired microstructure, all pipes undergo a specific treatment process.

High-frequency electric resistance welded (ERW) steel pipes are produced by utilizing the skin effect and proximity effect of high-frequency currents. After a hot-rolled coil is shaped by a forming machine, the edges of the tube blank are heated and melted. Pressure welding is then performed under the action of extrusion rollers to complete the production process.

To ensure seamless carbon steel pipes meet performance and durability requirements, various treatment methods must be applied throughout their preparation and installation. Here are some of the key application treatment methods for seamless steel pipes.