Chamber Furnaces, Sheet Metal Preheating Furnaces electrically heated

They are ideally suited for forming processes such as forging or hot forming steel sheets.

Process Control

Function and equipment

Gluehofen
N1491S
Vorwaermofen
N2349S_Türöffnung_0.png
N6080_13S
Deckenbeheizung

These very rugged chamber furnaces with radiation heating are designed for continuous heat-treatment processes. They are ideally suited for forming processes such as forging or hot forming steel sheets. The use of a wide variety of accessories enables these furnaces to be tailored to the relevant application. 

  • Tmax 1200 °C
  • Very rugged design
  • Five-sided heating from both sides, bottom, rear wall and door
  • Heating elements installed on ceramic support tubes enable unimpaired heat radiation
  • Bottom heating protected by heat-conducting SiC plate
  • Manual lift door for chamber furnaces to N 951
  • Electro-hydraulic lift door for chamber furnaces from N 1296
  • Temperature uniformity up to +/−  7.5 °C according to DIN 17052-1 
  • Closable measuring port for customer's temperature measuring system
  • Holding time measurement for the charge until it goes to forging or forming of steel sheets: After charging, the operator presses a key and the previously defined holding time for the load begins to run. The end of the holding time is indicated by both acoustic and optical signals, meaning that the charge can be removed.
  • Heat resistant zinc paint for protection of door and door frame
  • Over-temperature limiter with adjustable cutout temperature as temperature limiter to protect the furnace and load
  • Exclusive use of insulation materials without categorization according to EC Regulation No 1272/2008 (CLP). This explicitly means that alumino silicate wool, also known as “refractory ceramic fiber” (RCF), which is classified and possibly carcinogenic, is not used.
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive
  • Controller with touch operation B500 (5 programs with 4 segments each)
  • Freeware NTEdit for convenient program input via ExcelTM for WindowsTM on the PC
  • Freeware NTGraph for evaluation and documention of firings using ExcelTM for WindowsTM on the PC
  • MyNabertherm App for online monitoring of the firing on mobile devices for free download

Additional equipment

  • Other temperatures on request
  • SiC plates to protect the wall heating elements
  • Electro-hydraulic lift door for models to N 951
  • Protective gas ports in combination with silicone sealing of the chamber
  • Protective gas boxes for heat treatment under non-flammable protective and reaction gases
  • Loading devices and charging aids
  • Charging grates for heavy loads
  • Cooling fan in combination with motor-driven exhaust air flaps in the top of the furnace
  • Commissioning of the furnace with test firing and temperature uniformity measurement using 11 thermocouples including record of the measurement results
  • Furnace chamber with optional heating elements in the ceiling when used for preheating of sheetmetal plates
  • Process control and documentation via VCD software package for monitoring, documentation and control

Technical specifications

Model Tmax Inner dimensions in mm Volume Outer dimensions2 in mm Heating power Electrical
  °C w d h in l W D H in kW1 connection
N 731 1200 750 1300 750 730 1800 2400 2890 70 3-phase
N 761 1200 800 1900 500 760 1740 2700 2650 70 3-phase
N 891 1200 800 1400 800 890 1740 2200 3450 70 3-phase
N 951 1200 1000 1900 550 950 2060 2700 2780 70 3-phase
N 1296 1200 1800 1200 600 1296 2860 2000 3020 70 3-phase
N 1491 1200 1660 1200 750 1490 2720 2000 3350 110 3-phase
N 1501 1200 1000 1500 1000 1500 2060 2300 3845 95 3-phase
N 1601 1200 1600 2000 500 1600 2660 2900 2900 110 3-phase
N 1760 1200 2200 1600 500 1760 3400 2500 2900 110 3-phase
N 1771 1200 1400 1400 900 1770 2460 2200 3745 110 3-phase
N 2161 1200 1700 1700 750 2160 2760 2600 3350 110 3-phase
N 2201 1200 1000 2200 1000 2200 2060 3000 3845 150 3-phase
N 2251 1200 2500 1500 600 2250 3560 2300 3020 110 3-phase
N 2401 1200 2500 1200 800 2400 3560 2000 3445 110 3-phase
1Depending on furnace design connected load might be higher 
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.

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Customer Test Center

What furnace is the right choice for this specific process? This question cannot always be answered easily. Therefore, we have set up our modern test center which is unique in respect to size and variety. A representative number of furnaces is available for tests for our customers.