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Martempering Furnaces using Neutral Salts

  WB 30 with charging aid

Salt-bath hardening in practice

Double martempering bath

WB 10 - WB 400

WB 10 - WB 400 martempering furnaces are filled with neutral salt and offer remarkably rapid and intensive heat transmission to the workpiece while ensuring optimum temperature uniformity. For working temperatures at between 180 °C and 500 °C these furnaces are ideal for quenching or cooling with minimal workpiece distortion, retempering, austempering for optimal toughness, recrystallization annealing after electrical discharge machining (EDM) and for blueing. The quenching or cooling process is applied in order to achieve an even temperature uniformity throughout the workpiece's entire cross-section before the formation of martensite and to avoid distortion and formation of cracks in valuable mechanical components during the subsequent hardening process. Tempering in a martempering bath is the same as the tempering process in air circulation furnaces and is used to reduce a previously hardened workpiece to a desired hardness, to increase toughness and reduce stress within the workpiece. Austempering is a good choice to achieve a high level of toughness and dimensional accuracy in oil hardened low-alloy steels. Workpieces subject to austempering have high tensile strength and good elasticity.

  • Tmax 500 °C
  • Optimal temperature uniformity
  • Martemper bath temperature control
  • Over-temperature limiter controller with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter for furnace and product
  • Heating with immersion heating elements
  • Charging basket

Additional Equipment

  • Charging aid mounted on side of furnace
Article no.ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmSupplyElectricalWeight
  °Cwdhin lWDHpower/kWconnection*in kg
001305100 WB 10 500 220 200 300 10 550 450 570 1.0 1-phase 60
001305200 WB 20 500 300 210 460 20 610 580 920 2.6 1-phase 110
001305300 WB 30 500 300 210 580 30 610 580 920 3.2 1-phase 140
001305700 WB 70 500 400 300 680 70 750 680 980 7.5 3-phase 240
001305800 WB 200 500 540 520 880 200 900 900 1200 18.0 3-phase 660
001305900 WB 400 500 730 720 980 400 1100 1100 1300 24.0 3-phase 1150
*Please see page 32 for more information about mains voltage
Information about salts by Petrofer and Durferrit and their application

SaltApplicationWorking temperatureComment
  in °C 
AS 135/140 Salt-bath hardening, tempering, austempering 180 - 500 Not for use with workpieces which are heated up to above 950 °C and salts which contain more than 13 % KCN
AS 220/225 Tempering, austempering 250 - 500  
AS 200/235 Tempering, austempering 280 - 500 Nitrite-free in the as-received condition
AS 200/235 Tempering 340 - 500  

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