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  1. E-Service
  2. Useful tools
  3. Preheating temperature for flame cutting
  4. Notes to the procedure of preheating

Notes to the procedure of preheating

Pre-heating and cutting

  • reduced cooling rate

             → reduction of the hardness at the flame cut edge (microstructure)

             → reduction of local stress due to balancing of the temperature gradient

  • min.-preheating temperature shall be reached over the entire plate thickness   

             ← heating from lower subsurface, control at upper subsurface

  • min.-preheating temperature shall be maintained during the entire cutting process
  • measuring of temperature can be done with:

            - thermo couple

            - thermo chalk

            - pyrometer

  • covering of the upper plate surface during pre-heating for isolation

Experiences concerning pre-heating and avoiding of crackoccurence

  • slow flame cutting speed approves lower preheating temperature
  • if so a loss in hardness will be induced
  • if the cutting speed is too slow, deep cut drag lines will occur

Attention: preheating-temperature and time for heat-up will increase with increasing plate thickness.

Post-heating

  • subsequent heating or/and holding at elevated temperature is usefull/recommended (<= 250 °C), especially for thicker plates (>75mm)
  • e.g. holding at elevated temperature may be done through piling of the hot uniform flame cut pieces or by post-heating of the flame cut pieces
  • e.g. when preheating temperature can not be maintained during the entire cutting process (e.g. for lager flame cut size)

Contact

 Sarah Gerart
Sarah Gerart

E-Service, E-Connect

Tel.: +49 6831 472025
Fax: +49 6831 473710
E-Mail

Dillinger

Contact

 Tobias Graf
Tobias Graf

E-Service, E-Connect

Tel.: +49 6831 473451
Fax: +49 6831 47992146
E-Mail

Dillinger

Innovative top-quality steel products, total orientation around our customers' needs and unceasing technological development in close cooperation with our partners form the basis of our success - as they have for more than 333 years.

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Contact

AG der Dillinger Hüttenwerke
Werkstraße 1
66763 Dillingen/Saar

Tel.: +49 6831 47 0
Fax: +49 6831 47 2212
E-Mail: info@dillinger.biz

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myE-Service & E-Connect
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Entry certificate
Feasibility
  • Product finder
  • Feasibility check
  • Delivery program
  • Comparison of steel grades
Approvals
Useful tools
  • Longitudinally profiled plates
  • Welding calculation
  • Hollomon parameter calculation
  • Preheating temperature for flame cutting
  • Conversion of certificate data
Documents
  • Data sheets & specifications
  • Customer information
  • Declaration of performance