Workhorse® Furnaces


The Workhorse® is Centorr Vacuum Industries' production oriented offering for a variety of heat treatment, brazing, hardening, and sintering operations.

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The basic design comprises of three standard hot zone sizes in four different temperature ranges (1000°C, 1315°C, 1650°C, and 2200°C), with a long list of optional equipment that makes this one of the most versatile custom-designed furnaces available today. The furnace chamber is console-mounted for a compact and highly efficient design and is a "front-loading" design which offers better ergonomics and temperature uniformity compared with vertical top/bottom loaders or round hot zones.

Unlike laboratory or smaller research furnaces, the Workhorse® contains features only found on high-end heat treat furnaces, such as a stainless steel interior vacuum chamber with manual door clamps; heavy duty Molybdenum or Tungsten rod heating elements; and all-metal Tungsten, Molybdenum, or SS radiation shield hot zone for fast heating and cooling, and excellent process cleanliness. You won't find any refractory ceramic insulation or graphite felt/board in this hot zone.

Standard Furnace instrumentation includes a programmable controller with PLC for process control. Name brand vacuum sensors and gauges are available on all systems as well as analog/ digital chart recorders. CVI's "one-button start" control system initiates a complete cycle including pumping, heating, and cooling modes. A full complement of program interlocks and safeties ensures safe and efficient furnace operation and reduces the chance of operator vacuum pumping errors, with our unique "keylock" override design.

The Workhorse® furnace line is available with high-vacuum or low vacuum pumping systems and can include Diffusion pumps, Turbomolecular pumps, or Cryogenic pumping systems, with or without cold traps and refrigerated baffles. A variety of processing environments are available including high/low vacuum and partial and/or positive pressures of Ar, He, and N2 gases, or H2 process gas with our Factory Mutual approved G-10503A gas system.

Variations of the standard Workhorse® design are available for Co-Firing (Series 3560) and Metal Injection Molding (Series 3570). With over 500 units in the field, the Workhorse® design is one of the most proven production designs for heat treating and brazing furnaces worldwide.


  • Cold Wall Vacuum furnace design with stainless steel inner jacket and outer jackets with baffled water cooling.
  • No epoxy coated surfaces on chamber interiors results in higher vacuum integrity.
  • Heavy duty rod elements used instead of thin strip or foil elements which can be easily damaged. Hot zones use a 30° rule to ensure proper radiation on all sides.
  • Operation to 2600°C with two- or four-sided heating elements in partial pressures from 10-3 torr up to 1-3 psig positive pressures of Argon, Nitrogen, Helium, and Hydrogen.
  • PLC with Industrial Programmable Controller or PC system using Intellution™ FIX32 HMI software customized by CVI for vacuum furnaces, with extensive data acquisition; and remote operation capabilities.
  • High and low vacuum pumping systems including diffusion, cyrogenic, and turbomolecular.
  • G-10504A Partial Pressure control system (1-1000 microns) available for suppression of low vapor pressure braze compounds, and our G-10503A positive pressure Hydrogen gas system with FM approval.
  • Graphic control panel shows location of vacuum pumps and system status using indicator lamps, and provides for manual operation of the furnace.
  • Water cooled power cables for effcient power capacity instead of low cost welding cables.
  • Integrated water cooling piping with color-coded hoses.
  • Analog Ammeters and Voltmeters on control cabinet for each leg of the power supply for operator feedback.


WxHxD (in/mm)
12 x 12 x 12
(300 x 300 x 300)
12 x 12 x 24
(300 x 300 x 610)
12 x 12 x 36
(300 x 300 x 913)
18 x 18 x24
(457 x 457 x 610)
18 x 24 x 36
(457 x 610 x 914)
24 x 24 x48
(610 x 610 x 1220)

*Custom sizes available upon request.


Optional Features

  • Manual rotameter or Mass Flow Controllers for precise, repeatable gas flow.
  • Integrated cooling fans available with or without integral heat exchangers.
  • CE / VDE / TüV / CSA approvals and other non-U.S. standards for compliance.
  • Rigid or Flexible water cooled busswork for improved maintenance and best electrical efficiency.
  • Chambers constructed of stainless steel interiors to provide improved vacuum pumping performance when compared to mild steel epoxy coated chambers. We grind smooth all internal welds, and polish them.
  • Stainless steel outer jackets available for long furnace life in areas with poor water.
  • Cylindrical chamber are structurally more sound, avoiding the multiple welds and resultant stresses inherent in a rectangular chamber.
  • The doors of the chamber are dished for strength thereby avoiding the possibility of warpage.
  • Integrated water flow indicators/flow switches with low water alarm setpoint for safe operation.


Alloys Processed

  • Stainless Steels
  • Ferrous and Non-Ferrous Alloys
  • Tool Steels
  • High Speed Steels
  • Ti, Nickel, and Superalloys
Made in the USA