CTH Bogie Hearth Furnaces – for Heat Treatment up to 1000 or 1320 °C

The electrically heated CTH bogie hearth furnaces are suitable for preheating and annealing steel in air, as well as applications in industrial ceramics. The pull-out bogie makes loading easier: workpieces can be placed and aligned outside the furnace chamber. Two temperature versions are available for each furnace size: CTH L up to a maximum of 1000 °C and CTH up to a maximum of 1320 °C.

Five-sided heating with heating coils on support tubes and standard two-zone control support uniform heating of the load. Multilayer insulation reduces heat loss. The ventilated housing with stainless steel side panels helps reduce external surface temperatures and protects against corrosion. SiC roof and floor plates protect the load and the floor heating elements. Loading takes place through a manually operated hinged door with a wide opening angle; depending on the version, the bogie runs on rails or can be moved freely.

Technical Features of the CTH Series

  • Maximum temperature: 1000 °C for CTH L, 1320 °C for CTH
  • Loading: manually operated pull-out bogie; rail-guided or freely movable, depending on the version
  • Heating: five-sided electric heating with Kanthal heating coils on support tubes
  • Heating zones: two-zone control supplied as standard to support uniform temperature distribution
  • Thermal insulation: multilayer insulation to reduce heat loss
  • Housing: robust, powder-coated steel frame with stainless steel panels and ventilation behind the panels
  • Furnace chamber: insulating firebrick lining resistant to reducing atmospheres
  • Roof and floor: SiC roof plates to protect the load from falling particles and SiC floor plates to protect the floor heating elements
  • Door: manually operated hinged door with adjustable right-hand hinges and an opening angle of up to 180°
  • Door seal: flexible seal to protect the lining
  • Airflow: manually operated air inlet and exhaust dampers
  • Safety: door safety switch with positive-opening action
  • Solid-state relays: optional for silent switching without mechanical switching contacts
Available Models

Equipment and Options

Additional equipment is available depending on furnace size and process requirements:

  • Additional bogie and increased bogie load capacity
  • Electric rail-guided bogie drive with a safety laser scanner
  • Electric lifting door with a safety laser scanner, parallel-opening swing door or left-hinged swing door
  • Doors and bogies on both sides to suit production workflows
  • Automatically controlled air inlet and exhaust dampers, and a manually or automatically controlled cooling fan
  • Three-zone control and adjustable temperature limiter
  • NewGen ESP energy-saving package and APM heating coils
  • Inspection hole with closure plug and an extraction hood above the furnace
  • High-temperature versions rated for 1350 or 1400 °C with a suitably adapted furnace design

The appropriate equipment depends on your material, temperature profile, load weight and loading procedures. We agree the available options and their combination for your furnace version.

Controllers for CTH Bogie Hearth Furnaces

The TC 5050 is supplied as standard. The optional TC 707 offers additional programming and process documentation functions.

TC 5050 – Standard

  • Programming: 29 freely programmable programs with two heating ramps, hold periods and a controlled cooling ramp
  • Features: LED display, fault detection and keypad lock; optional PC connection

TC 707 – Optional

  • Programming: up to 99 individually named programs and up to 99 segments, each comprising a heating ramp and a hold period; adjustable cooling ramp and scheduled start using the real-time clock
  • Operation: high-contrast 4.5″ LCD with a clear display of process values and intuitive dial operation
  • Documentation: process data logging in CSV format on a USB stick, event memory for fault diagnosis, and USB and Bluetooth interfaces
  • SuperWise connectivity: process monitoring and program entry via PC or smartphone, graphical analysis of temperature profiles and receipt of warning notifications

Applications of CTH Bogie Hearth Furnaces

The CTH series is used in industrial heat treatment and industrial ceramics. The pull-out bogie makes it easier to handle larger workpieces and arrange substantial loads. Depending on the material, required temperature and selected version, typical applications include:

  • Preheating steel components and tools
  • Annealing and stress relieving steel
  • Firing and sintering suitable ceramic workpieces
  • Heat treatment trials and process development

CTH or CTH L – Choosing the Right Temperature Version

The choice depends on the required process temperature: CTH L is rated for a maximum of 1000 °C, and CTH for a maximum of 1320 °C. In addition to temperature, the dimensions and weight of the load, heating time, hold time and cooling are key factors. The maximum temperature does not automatically constitute a guaranteed continuous operating temperature.

Example, size 1000: CTH 1000 and CTH 1000 L each provide approximately 1000 litres of chamber volume, with internal dimensions of approximately 800 × 1250 × 1000 mm. The CTH 1000 has a heating power of approximately 65 kW, and the CTH 1000 L approximately 55 kW. Both datasheets specify a maximum load weight of 800 kg with the load distributed across the surface. External dimensions and furnace weight also differ.

The load capacity must suit the weight distribution of your workpieces. Higher load weights require a suitably designed bogie version. The example values stated apply to size 1000; the other models are listed in the model overview.

Request a Personalised Quotation

Please tell us your material, required heat treatment process and target temperature, as well as the dimensions and weight of your load. Please also specify quantities, hold time, required cycle time and intended loading method.

What Is a Bogie Hearth Furnace?

A bogie hearth furnace is a chamber furnace with a movable floor. This floor serves as a loading bogie and can be moved out of the furnace chamber. Workpieces can therefore be placed and aligned outside the furnace. The entire load is then moved into the furnace on the bogie.

In the CTH series, electric heating coils heat the load from five sides. A programmable controller manages the temperature profile. Two-zone control supports heat distribution throughout the furnace chamber; the treatment result also depends on the material, loading arrangement and process conditions.

Schröder Industrieöfen helps you select the right furnace size, temperature version and equipment for your application.

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CTH and CTH L Bogie Hearth Furnaces – Model Overview

Each furnace size is available as a CTH L version rated for a maximum of 1000 °C and as a CTH version rated for a maximum of 1320 °C. Additional sizes and custom versions are available on request.