Low-Vacuum Variable-Pressure Pulse Nitriding Furnace

Applications:
The JNV series pit-type low-vacuum variable-pressure nitriding furnace is a standard, energy-efficient, eco-friendly batch-type electric furnace designed for nitriding heat treatment. It is primarily used for gas nitriding various steel mechanical components—such as automotive crankshafts, motorcycle brake pads, piston rings, molds—as well as other workpieces.

Features:
* Rapid Penetration Rate
The nitriding process is conducted under low-vacuum conditions involving periodic fluctuations in furnace pressure. This ensures the atmosphere remains fresh active—with the nitrogen potential also varying cyclically—thereby endowing the single-stage nitriding process with the advantages typically associated with two- three-stage nitriding, eliminating the need for multi-stage processing significantly accelerating the nitriding rate.
* Broad Applicability Uniform Penetration Layer
For workpieces featuring internal cavities, T-shaped profiles, working surfaces situated within extremely narrow crevices—situations traditional positive-pressure nitriding furnaces struggle to facilitate the exchange diffusion of fresh atmosphere, often resulting in suboptimal nitriding effects in these specific areas—the low-vacuum variable-pressure technology offers a solution. This technology enables the furnace gas to diffuse automatically to every corner of the chamber, leaving no "dead zones." Consequently, internal pores, capillary channels, the working surfaces within mold crevices can all achieve the desired nitrided layer depth.
* High Loading Capacity Low Processing Costs
By employing low-vacuum variable-pressure technology—which executes the nitriding ( carbonitriding) process within a low-vacuum, pressure-fluctuating environment—fresh atmosphere is able to permeate every single corner of the furnace chamber. This allows for the dense packing of workpieces, thereby substantially increasing the furnace's loading capacity. Furthermore, the furnace features excellent sealing thermal insulation properties, resulting in a significant reduction in overall processing costs.
* Low Surface Friction Coefficient
Because the low-vacuum variable-pressure technology produces an extremely dense nitride penetration layer on the workpiece surface, the resulting surface exhibits a very low coefficient of friction.
* Low Brittleness
The periodic fluctuation of furnace pressure induces corresponding cyclical changes in the nitrogen potential of the furnace atmosphere. While simultaneously accelerating the nitriding rate, this mechanism effectively suppresses the formation of brittle phases (specifically Fe₂N). This helps to minimize brittleness effectively prevents surface spalling (peeling)—a common issue that can occur during the operational service life of the workpiece.
* Process Stability
The furnace atmosphere is uniform precisely controllable, as is the furnace temperature. This ensures exceptional process stability, thereby enhancing guaranteeing the high quality of the nitriding treatment applied to the workpieces.
* Environmental Friendliness
The furnace features excellent sealing integrity; waste gases are drawn out by a vacuum pump, routed to a sealed water tank for treatment, then safely discharged. As such, this system qualifies as an environmentally friendly product.

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