Mannesmann Seamless Pipe Mill

Overhaul: 2007/08
General Information about the Pipe Mill:

Annual Production Capacity: 450,000 Mg/year
Products: Hot-rolled seamless pipes
Outside Diameter Range: Ø 21.3mm to Ø 114.3mm
Wall Thickness: 2.0mm to 10.0mm
Maximum Grade: 10CrMo9-10
Certifications: PED, AD 2000, API 5L, DNV, UDT, BV, LR, PRS
Target Markets: Boiler, line pipes, oil & gas, construction.

Length:
Random: 4 – 12 m (over 12 m upon agreement)
Limited: +300/-0 mm
Exact (with maximum deviation): +10/-0 mm for length < 6 m +15/-0 mm for length 6 – 12 m +(upon agreement)/-0 mm for length > 12 m
Multiple with allowance for every cutting
Grades: carbon steel and low-alloy steel (max 10CrMo9-10)

These processes cover the full cycle from raw material (bloom) preparation to the final inspection and packaging of the seamless steel tubes.

Bloom preheating
Bloom cutting
Heating in rotary furnace
Calibrating press
Piercing press
Intermediate reheating
Elongating cross rolling
Push bench rolling
Reeler mill
Mandrel drawing
Bottom and end cutting
Reheating in walking beam furnace
Scale removing
Stretch reduction rolling
Hot-sawing of tubes
Gxc2Ht3
Cooling of tubes
Straightening
Cut to exact length
End finishing
Tube heat treatment
Hydrostatic test
NDT – Eddy Current
NDT – Ultrasonic
Inspection of surface and dimensions
Laboratory testing
Tube marking
Weighing, Measurement of length, packaging