Hot-expanded seamless pipes, commonly referred to as hot-expanded pipes, are a type of steel pipe that undergoes a special manufacturing process. These pipes have a relatively low density but exhibit strong contraction properties. The production involves a paddle finish rolling method where the pipe's diameter is increased through cross-rolling or drawing techniques. This process allows for rapid thickening of steel pipes, enabling the creation of non-standard and custom-made seamless pipes at a lower cost and with higher efficiency. As a result, it has become a growing trend in the global steel pipe industry. The production of hot-expanded seamless steel pipes in China follows specific standards. One of the key standards is GB 3087-1999, which outlines the technical requirements for such pipes. Additionally, the standard for hot-expanded seamless steel pipes, also known as welded steel pipes, is GB/T 3091-2000. These standards ensure quality control and consistency in the manufacturing process, making the products suitable for various industrial applications. Compared to traditional methods, hot expansion offers significant advantages in terms of production speed and cost-effectiveness. It is particularly useful when producing specialized or irregularly shaped pipes that may not be easily manufactured using conventional techniques. This makes it a popular choice in construction, oil and gas, and other industries that require high-quality, durable piping solutions. Octagonal Ring Joint Gasket,Octagonal Ring Gasket,Octagonal Rtj Gasket,Octagonal Ring Joint WENZHOU JINGWEI SEAL TECHNOLOGY CO., LTD , https://www.ringjoint-gasket.com