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Thermprocestechniek II

Protective Gas Boxes with additional Vacuum Lid for Models N 7 - N 161

   
   

Protective gas box for N 41/H furnace with additional vacuum lid

Working with Protective Gas Boxes with additional Vacuum Lid to ensure Protective Gas Atmosphere

When heat treating bulk goods and hollow parts under defined protective gas atmosphere we recommend the usage of protective gas boxes with an additional vacuum lid. Thus the traces of oxygen in the box can be reduced by a considerable amount which improves the quality of the components accordingly. These boxes are equipped with a lid for top charging, protective gas inlet and outlet as well as a vacuum lid with rubber sealing gasket. Gas ductwork and handling while hot is the same as the protective gas boxes described on page 11. In addition, these boxes also feature a connection for a vacuum pump with a shut-off valve. After charging the box in a cold state it is brought into vacuum and afterwards flushed with protective gas. By repeating this process once or several times the results are considerably improved. After the box was flushed with protective gas the last time, the vacuum lid is removed and the box is placed into the preheated furnace. Protective gas is used for heat treatment. After the heat treatment the box is taken out of the furnace and can be cooled in air or be opened to remove the charge. The box can also be force-cooled on a cooling platform (page 20) while closed. Be sure that the protective gas flowrate is increased for this application.

  • Tmax 1100 °C
  • Protective gas box with process lid, vacuum lid, protective gas inlet and outlet through the furnace collar and seal profile for process lid with support for vacuum lid
  • Lid sealed with ceramic fiber, ceramic insulating materials can alternatively be used
  • Vacuum lid with rubber sealing gasket
  • Gas connection with quick-release coupling and 3/8 inch hose connection
  • Manipulating fork (up to N 17/HR)
  • Heat-resistant alloy 314 (AISI)/(DIN material no. 1.4841)
  • Charge thermocouple type K

Additional Equipment

  • Starting with model N 31/H, with a charging trolley
  • Digital temperature display
  • Vacuum pump
  • Protective gas system
Article no.FurnaceInner dimensions in mmExterior dimensions in mm*Preflush/cooling rateProcess flush rate
  wdhWDHl/minl/min
631000515 N 7, N 7/H 104 144 42 150 200 102 15 - 20 5 - 8 
631000516 N 7/H 164 174 62 210 230 110 15 - 20  5 - 8 
631000517 N 11, N 11/R 164 224 72 210 280 132 15 - 20  5 - 8 
631000518 N 11/H, N 11/HR 184 274 72 230 330 132 15 - 20 5 - 8 
631000519 N 17, N 17/R 164 374 72 210 430 132 15 - 20  5 - 8 
631000520 N 17/H, N 17/HR 184 424 72 230 480 132 15 - 20 5 - 8 
631000521 N 31, N 31/H 284 274 112 330 330 172 20 - 25  10 - 15 
631000522 N 21, N 41, N 41/H 184 274 112 230 330 172 20 - 25  10 - 15 
631000523 N 41, N 41/H 234 324 142 280 380 200 20 - 25  10 - 15 
631000524 N 41 284 374 162 330 430 222 20 - 25 10 - 15
631000525 N 61, N 61/H 264 474 162 310 530 222 20 - 25 10 - 15
Larger boxes and custom dimensions available upon request *without vacuum lid

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