ZeroFlow gas nitriding control systemSECO/WARWICK offers various furnace styles in Batch and Continuous for Gas Nitriding. 

SECO/WARWICK is a technology leader with the proprietary ZeroFlow® method of economical gas flow control.

Listed below are all the options of SECO/WARWICK furnace styles for gas nitriding.  Equipment can achieve optimum results with gas nitriding using uniform, high convection heating, precision nitriding potential and ammonia control along with extensive experience with load mechanics and processing of various metals.

Experienced SECO/WARWICK process specialists can assist in furnace type selection and in product material handling/loading.  The SECO/WARWICK R&D facilities help customers in determining the correct cycle for their products.  Optional tools such as a simulation and  database programs for many common alloys and case requirements can help pinpoint potential cycles quickly.


  • Experience
  • Most Advanced Technology
  • R&D assistance
  • Value
  • Global Resources

In addition to Gas Nitriding, Ferritic NitroCarburizing (FNC) is a related nitriding process which is gaining much popularity due to the specific wear and anti-corrosion properties offered, including coupling with post-process high temperature oxidation.

Equipment Styles Best Suited for Nitriding and NitroCarburizing

  • Pit Retort Furnace
  • Horizontal Front Loading Retort Furnace
  • Bell Retort Furnace
  • Roller Hearth Multi-Chamber


  • Vacuum Purge
  • Turbo Atmosphere Cooler
  • Various Controls Options
  • Emissions Burning



ZeroFlow® Control by SECO/WARWICK

Decades of gas nitriding experience came with the realization that and large volume of process gas was required and that better options must be available that can accomplish two things:

  1. Proper formation and control of the nitrided layer,
  2. By reducing the volume of process gas, you can reduce the need for large storage of ammonia and nitrogen.

Does nitriding with the use of ZeroFlow control obtain the same results as other nitriding methods?

Definitely yes. It is nitriding, based on continuous adjustment of the nitriding potential, which assures obtaining the proper structure of nitrided layers and offers the same results as in other nitriding methods. It has been confirmed in many industrial applications.

Does use of ZeroFlow control allow for nitriding without creating the white layer of nitrides?

Definitely yes. That method, through proper adjustment of the nitriding potential, allows for nitriding without creating the white layer. In many cases a white layer might be desired and is still controllable.

Is it possible to adapt your existing  furnaces with the ZeroFlow nitriding method?

Definitely yes. In many nitriding furnaces there is no proper automatic atmosphere adjustment, or the processing costs are high with gases and royalties. Under ZeroFlow the gas system will be simplified, and the ZeroFlow control does not always require using materials with the very highest content of expensive nickel on the internal equipment surfaces.

 What practical benefits are offered by ZeroFlow control in relation to other methods?

 The ZeroFlow option reduces operating costs and offers improved quality of the resulting nitrided layers.

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