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Mandrel Bars for seamless tube production

We are also one of the leading suppliers of Mandrel Bars to the Seamless Steel Pipe producers like ISMT, Jindal SAW, Maharashtra Seamless & BHEL. Depending on the process, the tools, such as pilger mandrels, mandrel bars, rolls, etc., are exposed to a range of different stresses, which result from the varying periods of contact between the tools and the material at rolling temperature. Steels must contain a balanced mix of alloys in order to achieve the longest possible service life and thus high tonnage per tool insert. Steels used for tube manufacturing must meet the following demands.

Good high-temperature strength, Low susceptibility to hot cracking, resistance to high-temperature wear and excellent high-temperature toughness.

SKI supplies mandrels either in fully machined chromium plated or scaled condition or in rough machined (tempered and peeled) condition. In addition to universally applicable standards steels, we offer specialty steels specifically tailored to different manufacturing processes and individual customer requirements
   
  Benefits for the pipe manufacturer:
  • Steel and heat treatment all from one source
  • Short delivery times through direct delivery
  • Long service lives through consistent quality
  • Competent consulting



» Properties and applications for tube manufacturing steels
» Steel grades for different manufacturing process

Properties and applications for tube manufacturing steels

Grade Primary use Insusceptibility to hot cracking High-temperature wear resistance Toughness Scale adhension
Thermodour 2740 push benches + ++ +++ ++
Thermodour 2342 EFS MPM mills and large continuous trains ++ +++ ++ +++
Thermodour 2343 EFS continuous trains ++ +++ + +++
Thermodour 2344 EFS small continuous trains ++ ++++ + +++
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Steel grades for different manufacturing process


Manufacturing process Tool Grade Working Hardness in HB (typical values) Working tensile strength in N/mm2 (typical values)
PQF,FQM and MPM mills mandrel bars Thermodur 2342 EFS 300-375 1000-1275
Thermodur 2344 EFS 300-375 1000-1275
Continuous tube mill mandrel bars Thermodur 2342 EFS 265-375 900-1275
Thermodur 2343 EFS 265-375 1000-1275
piercing mandrel Thermodur 2790 Customer - specified Customer -
  specified
Push bench plants mandrel bars rolls Thermodur 2740 300-355 1000-1200
Thermodur 2365 EFS 470-510 1600-1750
ASSEL mill and shoulder piercing mill mandrel bars Thermodur 2740 300-355 1000-1200
piercing mandrel vent caps Thermodur 2344 EFS 265-355 900-1200
Thermodur 2365 EFS 265-355 900-1200
Hot pilger mill Pilger mandrels Thermodur 2740 300-355 1000-1200
Cross rolling mill piercing mandrel Thermodur 2344 EFS 265-355 900-1200
Extrusion Extrusion rams Thermodur 2367 EFS 50-52 HRC  
Thermodur 2365 EFS 50-52 HRC
Cold pilger mill Pilger mandrels Cryodur 2379 50-56 HRC  
Cryodur 2709 Approx 56 HRC
Thermodur 2344 EFS Approx 56 HRC
Pilger rolls Cryodur 2379

Customer-specified

Cryodur 2362

Customer-specified

Thermodur 2344 EFS approx 54 HRC
Welded Pipes Forming rolls Cryodur 2379 58 – 60 HRC  
Welding rolls Thermodur 2344 EFS

Customer-specified

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Grade C Si Cr Mo NI V
Thermodour 2726 0,26 - 0,70 0,40 1,40 0,20
Thermodour 2740 0,28 - 0,70 0.60 2,50 0,30
Thermodour 2342 0,35 0,80 4,75 1,0 - 0,85
Thermodour 2343 0,38 1,00 5,30 1,30 - 0,40
Thermodour 2344 0,40 1,00 5,30 1,40 - 1,00
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