Stainless steel pipes are hollow, long circular steel tubes widely used across various industries, including petroleum, chemical, medical, food, light industry, and mechanical instrumentation. These pipes are essential for industrial transmission and mechanical structural components. Due to their high bending and torsional strength coupled with lightweight properties, they are also extensively used in manufacturing mechanical parts, engineering structures, and are commonly found in furniture and kitchenware. Stainless steel pipes are categorised into several series based on their composition: Cr series (400 series), Cr-Ni series (300 series), Cr-Mn-Ni series (200 series), and the precipitation hardening system (600 series).