Seamless Steel Pipe

Carbon steel seamless steel pipe is a round hollow section steel pipe without seam. Seamless steel pipe is initially a hollow billet made of steel ingot or solid blank, and then become a seamless steel pipe by hot rolling, cold rolling or cold drawing. According to different production methods, seamless steel pipe can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extrusion pipes. They are mainly used for conveying fluid, such as oil, natural gas, coal gas and water. It is also widely used as structural parts and mechanical parts, such as oil drill pipe, car drive shaft, bicycle frame and construction scaffolding etc.

Seamless Steel Pipe

Seamless Steel Pipe

Hot Rolling: In this process, a solid round billet is heated to a high temperature and then pierced by a piercing machine to form a hollow tube. After that, the tube is further rolled and elongated through various rolling mills to achieve the desired diameter and wall thickness. Hot rolling is suitable for producing large-diameter and thick-walled seamless steel pipes with high production efficiency.

Cold Drawing or Cold Rolling: For seamless steel pipes that require higher precision and better surface quality, cold drawing or cold rolling processes are often used. Cold drawing involves pulling the hot-rolled pipe through a die to reduce its diameter and increase its wall thickness accuracy. Cold rolling is similar but uses a rolling process to achieve more refined dimensional control and a smoother surface finish.

High Strength and Pressure Resistance: Due to its continuous and seamless structure, seamless steel pipes have high mechanical strength and can withstand high internal and external pressures. They are capable of withstanding large amounts of stress and pressure without easily deforming or cracking, making them suitable for applications in high-pressure systems.

Good Sealing Performance: Without seams, these pipes have excellent sealing properties, minimizing the risk of leakage. This is particularly important in applications where the transportation of fluids or gases requires strict leakage prevention, such as in oil and gas pipelines and hydraulic systems.

Uniform Wall Thickness and High Precision: The manufacturing processes of seamless steel pipes ensure a relatively uniform wall thickness and high dimensional accuracy. This allows for more accurate design and installation in various engineering projects and helps to improve the overall performance and reliability of the systems in which they are used.

Oil and Gas Industry: Seamless steel pipes are widely used in oil and gas exploration, extraction, and transportation. They are used as drill pipes, casing pipes, and transmission pipelines to transport oil, gas, and various drilling fluids under high pressure and harsh conditions.

Mechanical Engineering: In mechanical manufacturing, seamless steel pipes are used to make hydraulic cylinders, pneumatic cylinders, and various mechanical parts that require high strength and pressure resistance. They are also used in the construction of machinery equipment, such as in the frames and structures of heavy machinery.