Seamless hot-rolled pipes are produced by heating steel above the recrystallization temperature, restoring the internal structure and properties of the metal.
Production Process of Seamless Pipes
Initial Calibration: Heated component undergoes initial calibration.
Mandrel Insertion: A mandrel is embedded to provide the appropriate cross-sectional diameter.
Rolling Process:
Material passes through sets of rolling cages with rollers positioned at different angles.
The rolling process elongates the material and reduces its thickness, ensuring seamless pipes with a uniform structure.
Homogeneous Block Formation:
Seamless pipes are made from a uniform piece of steel with a hole drilled through it.
High temperatures and the use of a homogeneous block of steel maintain the material's strength.
Metallurgical Approval
Seamless pipes receive metallurgical approval 3.1 or 3.2 in accordance with EN 10204 standards.
| Hot-finished seamless pipes | Hot-finished seamless pipes, precision, cold drawn | |
| Standard | EN 10210; EN 10297; EN 10216 | EN 10305 |
| Steel Grades | S355J2H+N, E355+N, P355N | E235 and E355 (+N – annealed, normalized in a protective atmosphere) |
| Certificate | certificate 3.1 or 3.2 according to EN 10204 standard | certificate 3.1 or 3.2 according to EN 10204 standard |
| Range of Diameters | 21,3 – 711 mm | 4 – 120 mm |
| Wall Thickness | from 2,3 mm to 100 mm | from 1,0 mm to 11 mm |
Hot-rolled seamless pipes are sold in commercial sections and can be cut to custom lengths upon request.
Cold-rolled seamless precision pipes are sold in lengths from 6 m to 6.2 m, with special lengths available on request.