Black steel seamless tubes, also known as carbon steel seamless tubes, are mainly made of carbon steel (an iron-carbon alloy). The carbon content is usually between 0.04% and 2.1%. The black color is due to the dark flaky appearance of the carbon steel material caused by the iron oxide coating formed during the manufacturing process.

Stainless steel smoke pipes are a type of stainless steel pipe used to connect wood stoves, gas stoves or other heating devices to chimney systems. Its main function is to safely guide the smoke produced by combustion out of the room, preventing the backflow of smoke or fire hazards.

Stainless steel pipes can be manufactured according to different uses and specifications. Specification refers to the size of the pipe, specifically the wall thickness of the pipe. As the specification increases, the thickness of the pipe wall will also increase, while the diameter can remain unchanged.

ASME is renowned for formulating internationally recognized industrial and manufacturing norms. Its standards cover areas such as boilers, pressure vessels, pipelines, and mechanical components, and it promotes global engineering safety and innovation through technical publications, conferences, and certification programs.

304L stainless steel pipe is a non-magnetic stainless steel pipe with a low-carbon (C ≤ 0.03%) version based on austenitic 18-8 alloy (approximately 18-20% Cr, 8-12% Ni).

ASTM A53 carbon steel is a specification for black and galvanized steel tubes covering both seamless and welded (resistance welding, furnace welding) processes, with nominal diameters ranging from NPS 1/8 "to NPS 26" (DN  6-650).

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.