Overview
Few areas of the steel industry offer as many different production routes as tube making. Which process is right depends on the diameter and wall thickness range, material, lot sizes, required tolerances and planned annual capacity.
KOA-NewTec provides expert services to international producers of seamless and welded tubes. We support you technically and commercially, from process selection through specification and bid comparison to commissioning and optimisation of the plant.
Seamless tubes
High-capacity mills
Mandrel mill, plug mill or push bench technology for high output. Selection and design depend on the size programme and capacity.
Medium-capacity mills
Cross-rolling processes after Assel or Diescher. Assel mills are particularly suited to heavy-wall tubes, for example for bearings and mechanical engineering.
Large-diameter mills
Pilger and expander technology for large diameters and wall thicknesses with flexible lot sizes.
Stainless & high-alloy tubes
Extrusion or cross rolling for stainless steel and special materials that place high demands on forming and surface.
Welded tubes
ERW / HFI
Electric resistance welded tubes from strip, typically for small and medium diameters in high volumes.
HSAW
Helical submerged-arc welded tubes from coil, for large diameters, e.g. in water and pipeline construction.
UOE
Large-diameter pipes formed from plate in U and O presses, longitudinally welded and expanded, for pipelines.
JCO
Progressive bending into J, C and O shape: flexible for large diameters and wall thicknesses in smaller lots.
Cold forming, finishing and inspection
Cold pilger mills
For precision tubes with tight tolerances and high-quality surfaces, especially in stainless steel and special materials.
Drawbenches
Cold drawing to produce dimensionally accurate precision tubes and to set mechanical properties.
Finishing lines
Straightening, cutting, bevelling, heat treatment, threading and bundling.
Inspection lines
Hydrostatic testing, ultrasonic and eddy-current testing, and dimensional and wall thickness measurement.
Services
Process selection
Evaluation of the candidate technologies against your size and material programme.
Specification & tendering
Preparation of technical specifications and support in approaching suitable suppliers.
Bid evaluation
Technical and commercial comparison of offers as the basis for your award decision.
Contract phase
Support in clarifying technical details and commercial conditions.
Erection & commissioning
Experts from our network for supervision, commissioning and ramp-up.
Modernisation & optimisation
Increasing output and improving quality of existing tube mills.