Hardening oven N 7/H

brazingannealingheat treatment

Overview
The N 7/H – N 87/H chamber furnaces provide a versatile solution for annealing, hardening and brazing in laboratory and light production environments. Robust multi-layer insulation and deep furnace chambers permit efficient heat treatment processes up to 1280 °C while minimising energy consumption.

Function and equipment
These furnaces feature three-sided heating (both side walls and bottom), heating elements mounted on support tubes for free radiation, and a SiC-protected bottom heating zone. A stainless-steel upper door jamb and a parallel-guided downward-swinging door with gas dampers protect operators during hot operation. The B500 touch controller and NTLog Basic data-logging are available for program control and process recording.

Standard equipment

• Maximum temperature: Tmax 1280 °C
• Deep furnace chamber with three-sided heating (both side walls and bottom)
• Heating elements on support tubes for extended life and free heat radiation
• Bottom heating protected by SiC plate
• Stainless-steel upper door jamb for hot operation
• Temperature uniformity up to ±10 °C (DIN 17052-1)
• Multi-layer insulation for reduced energy consumption
• Base frame included; N 7/H–N 17/HR as bench-top models
• Exhaust opening at furnace side or rear (from N 31/H)
• Parallel-guided downward-swinging door with gas dampers
• B500 touch controller (5 programs × 4 segments)
• NTLog Basic for process data recording via USB

Technical specifications
Model | Tmax (°C) | Inner dimensions w × d × h (mm) | Volume (l) | Outer dimensions W × D × H (mm) | Connected load (kW) | Electrical connection | Weight (kg) | Heating time (min)
N 7/H | 1280 | 250 × 250 × 140 | 9 | 800 × 650 × 600 | 3.0 | 1-phase | 60 | 320
N 11/H | 1280 | 250 × 350 × 140 | 11 | 800 × 750 × 600 | 3.5 | 1-phase | 70 | 320
N 11/HR | 1280 | 250 × 350 × 140 | 11 | 800 × 750 × 600 | 5.5 | 3-phase | 70 | 70
N 17/HR | 1280 | 250 × 500 × 140 | 17 | 800 × 900 × 600 | 6.4 | 3-phase | 90 | 110
N 31/H | 1280 | 350 × 350 × 250 | 31 | 1040 × 1030 × 1340 | 15.0 | 3-phase | 210 | 90
N 41/H | 1280 | 350 × 500 × 250 | 41 | 1040 × 1180 × 1340 | 15.0 | 3-phase | 260 | 105
N 61/H | 1280 | 350 × 750 × 250 | 61 | 1040 × 1430 × 1340 | 20.0 | 3-phase | 400 | 105
N 87/H | 1280 | 350 × 1000 × 250 | 87 | 1040 × 1680 × 1340 | 25.0 | 3-phase | 480 | 105
Notes: Outer dimensions vary with optional equipment. Heating time refers to empty closed furnace to Tmax −100 K. Connected load refers to standard configuration and may increase with options.

Applications and options

• Annealing boxes for protective gas atmospheres
• Charging carts and roller guides for material handling
• Deeper furnace chambers and larger sizes
• Cooling/quench stations with quench tanks
• Process controllers and data logging (NTLog Basic)

Features / technical data

• Max temperature 1280 °C
• Three-sided heating for improved uniformity
• SiC bottom protection and tubular heating elements
• Temperature uniformity up to ±10 °C (DIN 17052-1)
• Multi-layer insulation for energy efficiency
• B500 touch controller and USB data logging
• Bench-top and floor-standing models (N 7/H to N 87/H)