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ZeroFlow® Gas Nitriding Furnace

Single-chamber vacuum furnace with ZeroFlow® for regulated gas nitriding of machine parts, vehicles, aircraft and tools.

Batch Gas-Nitriding Vacuum Furnaces with ZeroFlow®

SECO/VACUUM offers ZeroFlow® gas nitriding furnaces in a variety of styles and models. Our proprietary ZeroFlow® technology using only ammonia as a process gas thereby reducing gas usage and minimizes emissions.

SECO’s vacuum nitriding furnaces achieve optimum results by using uniform high convection heating, precision nitriding potential and ammonia control, along with advanced load mechanics to process a variety of metals.

Gas Nitriding Processes for Vacuum Nitriding Furnaces

  • ZeroFlow
  • Nitriding
  • Nitrocarburizing
  • Oxidation
  • Nitrosulfurizing
  • Tempering
  • Annealing

Furnace Styles For Nitriding/NitroCarburizing

  • Horizontal front-loading retort furnaces
  • Vertical pit-style retort furnaces

Furnace Accessories

  • Vacuum purge
  • PLC controller

Benefits of Nitriding with ZeroFlow

  • Lower operating costs
  • Attractive Return-on-Investment (ROI)
  • Control of case depth
  • Control of nitride layer formation (including white layer)
  • Two-stage nitriding process without additions of dissociated ammonia or nitrogen
  • Simple ammonia-gas flow control
  • Advanced process monitoring/control
  • Low gas consumption
  • Reduced gas emissions (over alternative gas nitriding processes)
  • In-situ process control
  • Sophisticated process monitoring/recording and historical trending with a user-friendly HMI

Industries Served and Typical ZeroFlow® Nitrided Parts

  • Automotive, Racing, Heavy & Light Truck, Off -Road (gears, crankshafts, injectors, piston rods)
  • Aerospace/Aircraft/Rotocraft/Spacecraft/Military/Defense (gears, pinions, actuators)
  • Industrial Machinery & Goods (casting plates, locating pins, springs)
  • Tool & Die (hot working dies, high-speed tool steel cutters

Materials

  • Low & Medium Alloy Steels (41xx, 43xx, 51xx, 86xx, 93xx series)
  • Nitralloy® Alloys
  • Stainless Steels (300 & 400 series, precipitation hardening grades)
  • Tool Steels (H-series, M-series)
  • Iron (ductile, gray)

Horizontal and vertical retort furnaces for gas nitriding

Features

  • Vacuum purge for removal of air form the retort and for removal of the nitriding atmosphere at the end of the cycle
  • Automatic gas nitriding flow cool added a controller amount (0 - 100%) of ammonia gas, on demand.
  • Supervisory control system to continuously adjust and monitor process parameters
  • Lowest ammonia consumption in the industry
  • Burn-off stack to neutralize gas emissions from the system
  • Low gas consumption (nitrogen or other process gases) for applications other than nitriding.


Horizontal
Model #
Useful Dimensions
in(mm)
Gross Load Weight
lbs(kg)
Working Temperature
°F(°C)
Temperature Uniformity
°F(°C)
Number of Heating Zones Furnace Heating Power
(kW)

HRNe*-60.60.90-650-6-ZF 24x24x36 (600x600x900) 1320
(600)
300-1300
(150-700)
±5 one 75
HRNe-90.80.120-650-15-ZF 36x32x48 (900x800x1200) 3300
(1500)
300-1300
(150-700)
±5 three 150
HRNe-100.100.150-650-25-ZF 39x39x59 (1000x1000x1500) 5500
(2500)
300-1300
(150-700)
±5 three 240

*HRNe - Horizontal Retort Nitrider - Electrically Heated


Vertical
Model #
Diameter in(mm) Height in(mm) Gross Load Weight
lbs(kg)
Working Temperature
°F(°C)
Temperature Uniformity
°F(°C)
Number of Heating Zones Furnace Heating Power
(kW)

VRNe*-60.90-650-6-ZF 24
(600)
36
(900)
1320
(600)
300-1300
(150-700)
±5 two 40
VRNe-80.120-650-12-ZF 32
(800)
48
(1200)
2645
(1200)
300-1300
(150-700)
±5 two 80
VRNe-100.150.650-30-ZF 39
(1000)
59
(1500)
5500
(2500)
300-1300
(150-700)
±5 two 115
VRNe-120.150-650-30-ZF 48
(1200)
59
(1500)
6600
(3000)
300-1300
(150-700)
±5 two 135
VRNe-140.250-650-45-ZF 55
(1400)
98
(2500)
9900
(4500)
300-1300
(150-700)
±5 three 210
VRNe-160.250-650-60-ZF 42
(1600)
98
(2500)
13200
(6000)
300-1300
(150-700)
±5 three 225

*VRNe - Vertical Retort Nitrider - Electrically Heated


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