The API 5L specification of the American Petroleum Institute covers seamless and welded (including SAW, ERW and other processes) steel tubes and pipes.

In industrial pipeline systems, stainless steel pipes, as the main pressure-bearing components for transporting media, are widely used due to their excellent corrosion resistance, high-temperature resistance and strength advantages.

Schedule 40 (also known as SCH 40S) is one of the most commonly used nominal wall thickness series for stainless steel pipes. It features moderate wall thickness, balanced rigidity and cost, and is widely used in commercial and industrial fields.

316 stainless steel pipe is a typical austenitic stainless steel pipe. Due to its molybdenum (Mo) content, it has excellent resistance to pitting and crevice corrosion, and also features good plasticity and weldability.

Stainless steel mechanical tubes are usually divided into two major categories: welded type and seamless type. The former complies with the ASTM A554 standard. The steel strip is rolled into shape through resistance welding and then welded into tubes, and the external weld bead is removed to obtain a smooth surface.

Sanitary stainless steel pipes refer to circular stainless steel pipes with mechanically polished inner and outer surfaces, which are specifically used in fluid conveying systems that require high cleanliness and corrosion resistance.

Stainless steel exhaust pipes are key components used in the exhaust systems of automobiles, motorcycles and industrial equipment. Their main function is to guide the discharge of exhaust gases and withstand high temperatures, corrosion and mechanical vibrations.

Low carbon steel fittings refer to various types of pipe connection parts made from carbon structural steel (such as Q195, Q215, Q235, etc.) with a carbon content generally not exceeding 0.25% (most standards require ≤0.22%) through forging, rolling or welding processes.

Carbon steel rectangular tubes are rectangular hollow cross-section profiles made of carbon steel. Carbon steel is a widely used alloy, renowned for its strength and durability.

Pipe fittings are usually components used to connect pipes or various parts of pipe systems. They play a crucial role in the pipeline system.

Carbon steel welded pipe fittings are connection parts made of carbon steel as the base material through welding methods such as butt welding and socket welding, and are widely used in fields such as petrochemicals, chemical engineering, power, water treatment and HVAC.

Thick-walled carbon steel pipes are a type of carbon steel pipe with relatively large wall thickness, widely used in fields such as oil and gas transportation, high-temperature and high-pressure equipment, structural support, and industrial fluid transportation.

Carbon steel pipes are steel pipes with carbon as the main alloy component, widely used in the transportation of industrial fluids, especially playing a dominant role in natural gas and oil pipeline systems.

Carbon steel pipe fittings (CSFT) are pipe connection components made mainly of carbon steel through processes such as smelting, forming, processing, welding and surface treatment.

Coated carbon steel pipes enhance the corrosion resistance and service life of carbon steel pipes by applying a composite coating on the outer wall, inner wall or both of the pipes.