Hardening and Tempering Furnaces for Pipes

Tenova technology points of strength:

• Beam system not cooled type using a special refractory casting
• Easy mechanical system realized with hydraulic power or electromechanical
• Easy sealing system
• Top and bottom fired walking beam furnace design
• Charging and discharging machines allow a flexibility to the system for handling different sizes of pipes
• High velocity burners with free flame

Tenova typical requirements of a Hardening Furnace:

• Process of Austenitizing: pipe reheating above Austenitizing point
• Process of Normalizing: pipe reheating up to 920°C

• Critical aspects:
  • Pipe could significantly bend getting into the hot furnace;
  • Pipe must be carefully handled mainly in this final phase of the treatment;
  • Small production and then very short furnaces so width length ratio high;
  • High pipe temperature uniformity to get the metallurgical requirement and keep proper shape during and after quenching.

Tenova typical requirements of a Tempering Furnace:

• Process: pipe reheating up to 450-750°C

• Critical aspects:
  • Very delicate process for getting the final mechanical properties of the pipe;
  • Wide product range and consequently wide range of heating temperature and soaking time;
  • Very tight temperature uniformity tolerance to get uniform mechanical properties.