Q345B carbon steel pipe is one of the core pipe materials within the Chinese national standard system (GB/T 1591-2018 ‘Low-Alloy High-Strength Structural Steel’), falling under the category of low-alloy high-strength carbon steel pipes. Owing to its excellent comprehensive mechanical properties and high cost-effectiveness, it finds extensive application across multiple sectors including construction, machinery, chemical engineering, and municipal works.

Q355B carbon steel pipe is a low-alloy, high-strength seamless carbon steel pipe defined within Chinese national standards (GB/T 8163, GB/T 9948, etc.). Its core characteristics are ‘high strength and good low-temperature toughness’, making it one of the mainstream materials replacing traditional Q235 steel pipes in engineering applications.

S355 steel pipe has good welding performance, plasticity, toughness and processing technology, good corrosion resistance, high strength and low cold brittle critical transition temperature. The use of high-strength low-alloy steel can effectively reduce the weight of the structure, improve the strength and stiffness of the structure, and improve durability while reducing the thickness of the structure. S355 seamless steel pipes are commonly used in the production of bridges, ships, power station equipment, lifting and transportation machinery, machinery manufacturing and other engineering and welded structural parts that bear higher loads.

ASTM A179 specifies the technical requirements for seamless cold-drawn low-carbon steel tubes with minimum wall thicknesses, intended for use in tubular heat exchangers, condensers, and similar heat transfer equipment. The standard covers steel tubes with external diameters ranging from 1/8 inch to 3 inches (3.2 millimetres to 76.2 millimetres).

20# carbon steel pipe is a widely used high-quality carbon structural steel pipe within China's national standard (GB/T) system. Its core characteristics lie in its moderate carbon content and balanced comprehensive mechanical properties. It possesses exceptional versatility across petroleum, chemical, mechanical, and construction sectors, serving as the ‘foundational pipe material’ within industrial piping systems.

ASTM A36 carbon steel pipe is manufactured to the ASTM A36 standard established by the American Society for Testing and Materials (ASTM). With its excellent mechanical properties, good machinability and high cost-effectiveness, it has become one of the most widely used carbon steel pipes in global industrial applications.