Round steel tube mill Sch 40 80 Seamless Pipe

Seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, etc. according to different production methods.

1. Hot-rolled seamless pipes are generally produced on automatic pipe rolling units. The solid tube blank is inspected and surface defects are removed, cut into the required length, centered on the perforated end of the tube blank, and then sent to the heating furnace for heating and piercing on the punching machine. It continues to rotate and advance during piercing holes. Under the influence of the rollers and the end, the tube blank is hollow gradually, which is called a gross pipe. Then it is sent to the automatic pipe-rolling machine to continue rolling. Finally, the wall thickness is evened by the leveling machine, and the sizing machine determines the diameter to meet the specification requirements. The use of continuous pipe rolling units to produce hot-rolled seamless steel pipes is a more advanced method.

2. If you want to obtain seamless pipes with smaller sizes and better quality, you must use cold rolling, cold drawing, or a combination of the two. Cold rolling is usually carried out on a two-roll mill, and the steel pipe is rolled in an annular pass composed of a variable cross-section circular groove and a fixed conical head. Cold drawing is usually performed on a 0.5~100T single-chain or double-chain cold drawing machine.

3. The extrusion method is to place the heated tube blank in a closed extrusion cylinder, and the perforation rod and the extrusion rod move together to make the extrusion part extruded from the smaller die hole. This method can produce steel pipes with smaller diameters.

✅ High Pressure Rating – Withstands up to 40MPa+ depending on size & wall thickness

✅ Temperature Resistant – Performs well in environments up to 450°C

✅ Global Standards Compliant – Certified to API, ASTM, GB, ISO

✅ Custom Fabrication – Cut, bevel, drill, or coat as per your technical drawings

✅ Fast Lead Time & Bulk Supply – Stable production line for large-scale energy & infrastructure projects

🔥 Power Generation – Boiler tubes, superheater systems

🏭 Industrial Machinery – Hydraulic cylinders, shafts, connectors

🌊 High-Pressure Fluid Systems – Water, steam, chemical transfer

🏗️ Structural Engineering – Heavy-load support columns