RTB™ Single-Chamber Atmosphere Box Furnace
If you are looking for a single chamber atmosphere furnace, contact Surface Combustion today. Heat treaters worldwide know that Surface® furnaces provide greater value through an unmatched combination of reliability, repeatability and rugged performance. We will help you determine the optimum solution from our pre-engineered or custom designs for your process, product and material.
The RTBTM (Radiant Tube Box) Single-Chamber Atmosphere Box Furnace is a flexible, economical, pre-engineered design based on the hot zone of Surface’s legendary Allcase® Batch Integral Quench Furnace. Gas-fired radiant tubes or electric elements allow controlled atmosphere heat treatment with indirect heating – no internal alloy muffle assemblies are required. Easy to operate and maintain, the RTB can be customized to meet numerous process, product and material requirements and is available with the same standard sizes and hearth loadings as the Allcase.
Surface has long been known for its expertise in atmosphere processing. Whether the furnace uses RX® endothermic gas, DX® exothermic gas, nitrogen, nitrogen/methanol, nitrogen/hydrogen or any other process gas mixture, Surface has the experience and know how to provide an effective solution.
The RTB uses the latest technology in heating, energy efficiency and controls combined with Surface’s reputation for rugged furnace construction. The furnace casing is manufactured with gas-tight welded heavy steel plate supported by structural steel shapes. The insulation package is balanced to be energy efficient, allow rapid temperature changes and ease of maintenance. The RTB door is vertically lifted to allow front loading and uses Surface’s proprietary atmosphere tight door design. The furnace may be loaded by fork truck, charge car, or advanced automated charging systems. Multiple furnace hearth designs are available to support light or heavy workloads and enable automation.
You may choose either recuperated radiant tubes or electric elements for your RTB heating system. Radiant tube options include our patented TridentTM tube and vertically- or horizontally-mounted U-tube designs. For electric heating, we offer our proprietary ProlectricTM heating system. Both radiant tubes and Prolectric elements may be equipped with plunge cooling, which allows cooling of the load under atmosphere for processes such as isothermal annealing or equalizing for low distortion quenching.
Surface has spent decades of R&D (Research and Development) developing convective heating and atmosphere distribution systems. Our high-temperature VFTM fan units are critical to our success. Surface fans efficiently distribute the furnace atmosphere through our engineered wind flow patterns for uniform atmosphere and temperature distribution through the load.
An RTB can be designed to stand alone or be part of a new or existing furnace line. Surface provides a wide range of companion equipment, advanced controls and support services for single source responsibility. This allows you peace of mind that your installation will run smoothly, and your equipment will be taken care of for the long term.
Based on the industry-leading Allcase hot zone
Maximum operating temperatures up to 1950°F
Multiple gas fired heating systems available including vertical and horizontal radiant tube configurations.
Electric heating systems available including Proletric® style and canned element style
Roller rail or skid hearth systems
Oil, water, polymer, high temperature salt, and brine quench systems available
Atmosphere Cool Chambers (Top Cool) available
Numerous automation and networking controls available
Allcase® family also includes RTB (Radiant Tube Box) and ACT (Radiant Tube Box Furnace with Atmosphere Top Cool)
Proprietary VF™ fan extends fan life by minimizing vibration and gives uniform atmosphere distribution
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Commercial Heat Treating
Oil & Gas
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Cast and Ductile Iron
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Surface® is Your Source
Call Surface with the following information ready to initiate your furnace solution.
- hours per year
- available space
- operating temperature range
- heat source
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For Parts and Service, have one or more of the following details regarding your furnace if possible:
- Serial number
- Drawing number
- Photos of your furnace or parts for replacement
- Spare parts list
- Furnace rebuild history
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