304 stainless steel pipe is the most widely used foundational grade among austenitic stainless steel pipes. Renowned as the “universal stainless steel pipe” due to its excellent corrosion resistance, mechanical properties, and workability coupled with high cost-effectiveness, it caters to diverse applications ranging from residential decoration and food/medical sectors to industrial piping systems. It stands as the “mainstream benchmark product” in the stainless steel pipe market.

321 Stainless Steel Pipe is the core grade of titanium-stabilized austenitic stainless steel tubing. By adding titanium (Ti) to the 304 stainless steel base, it resolves the “intergranular corrosion” issue common in standard austenitic stainless steels under high-temperature conditions. It simultaneously offers superior high-temperature strength, oxidation resistance, and machinability, making it a critical tubing material for high-temperature industrial applications such as boilers, heat exchangers, and aerospace piping.

316 stainless steel pipe stands as a premium representative among austenitic stainless steel pipes. Enhanced with molybdenum (Mo) in its composition, it demonstrates significantly improved corrosion resistance, high-temperature stability, and mechanical properties compared to the base 304 stainless steel pipe. It performs exceptionally well in environments containing chlorine, salt, or highly corrosive media.

304L stainless steel pipe is a quintessential example of ultra-low-carbon austenitic stainless steel pipe, developed by optimizing conventional 304 stainless steel. By reducing carbon content to ≤0.03%, it addresses the susceptibility of 304 steel to intergranular corrosion following welding or high-temperature use, while retaining the superior corrosion resistance, toughness, and machinability characteristic of austenitic stainless steel.

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.