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.