Seamless Elbows: Core Components and Technological Evolution in Modern Industrial Pipeline SystemsIntroduction: Precision Steering Devices in Industrial Contexts In the intricate industrial pipeline network, seamless elbows play a crucial role - they are the "joints" of the pipeline system, guiding various fluid media to turn smoothly and ensuring the smooth transmission of energy, chemical raw materials, and industrial media. From the exploration and development of deep-sea oil and gas fields to towering chemical towers, from the tight circuits of nuclear power plants to the clean pipelines of food and medicine, seamless elbows, with their outstanding structural integrity and safety reliability, have become indispensable basic components in the modern industrial system. Unlike welded elbows, seamless elbows, with their one-piece forming process characteristics, demonstrate unique advantages in harsh working conditions such as high pressure, high temperature, and corrosive media, making them the preferred solution in industrial pipeline design. Chapter One: The Technological Evolution and Classification System of Seamless Elbows 1.1 Historical Development Trajectory