HT-703| Salt Bath Furnace

Salt-bath furnaces have an excellent temperature uniformity and ensure very good heat transfer to the work piece. Generally, heat treatment can be carried out with shorter dwell times than in chamber furnaces. Since the charge is heat treated with the exclusion of oxygen, scale and discoloration on the surface of the parts are kept to a minimum. The salt-bath furnace can be used for heat treatment of metals in neutral and active salt baths. They are used for processes such as nitriding according to Tenifer up to 600 °C, carburization to 950 °C or bright annealing to 1000 °C. The crucible is inserted so that it is suspended in the salt-bath furnace and can be replaced easily if necessary. Two crucible types are available:

• Type P: low carbon steel and CrNi plated for carburizing, neutral salt and annealing baths up to 850 °C
• Type C: high alloy CrNi steel for neutral salt and annealing baths up to 1000 °C

Crucibles are wearing parts because they are exposed to thermal stress during the heating and cooling process and corrosive salt. The following parameters influence wear of the crucible:

• Working temperature
• Number of heating and cooling cycles
• Salt
• Charge material
• Charge quantity
• Contamination of the charge
• The crucible must be checked regularly for wear and damage.
• We recommend to order a replacement crucible together with the furnace.