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, making them suitable for applications where flexibility and strength are important. The production method involves a paddle finish rolling process, where the pipe's diameter is increased through cross-rolling or drawing techniques. This method allows for rapid thickening of the steel pipe, enabling the creation of non-standard and custom seamless pipe models at a lower cost and with higher efficiency. As a result, it has become a popular trend in modern pipe manufacturing worldwide. Currently, China follows specific standards for the production of hot-expanded seamless steel pipes. One of the key standards is GB 3087-1999, which outlines the technical requirements for such pipes. Additionally, there is another standard known as GB/T 3091-2000, which applies to welded steel pipes but is sometimes referenced in discussions about similar products. These standards ensure quality control and consistency in the manufacturing process, helping to meet international market demands. Hot-expansion technology not only improves production efficiency but also enhances the versatility of steel pipes, allowing manufacturers to produce a wide range of sizes and specifications. It’s an essential process in industries such as construction, oil and gas, and automotive, where reliable and durable piping systems are crucial. With continuous advancements in manufacturing techniques, hot-expanded seamless pipes are expected to play an even more significant role in the future of global pipe production. Bonnet Seal Ring ,Metal Seal Ring,Bonnet Seal,Bonnet Gasket WENZHOU JINGWEI SEAL TECHNOLOGY CO., LTD , https://www.ringjoint-gasket.com