A heat treating furnace where the load enters the quench tank at predetermined times, all at once. For example, a Surface Combustion Allcase® batch furnace may have a 2500-pound load entering the quench tank once every two hours. Maximum operating temperatures up to 1950°F, with vertical and horizontal radiant tube configurations. Allcase® family also includes RTB and ACT.
Heat treats one load at a time. Furnaces that carry out more than one process, such as sealed quench furnaces with their heating and cooling chambers, may have a batch in each chamber. These are sometimes referred to as semi-continuous furnaces.
Single-chamber large box furnace is a cost-efficient, reliable, pre-engineered design that is also low maintenance. Standard loading widths and heights between 24” and 72” with a standard loading weight up to 20,000 pounds. Maximum operating temperatures of 2400°F.
POWER CONVECTION® VACUUM
The inner chamber is typically graphite-based rigid board and/or felt with machined graphite resistance heating elements. This gives the workload a very uniform band of heating through the operating temperature range which is typically from 1400°F to 2400°F.
POWER CONVECTION® VACUUM FURNACES
The Power Convection vacuum furnace is best suited for higher temperature processing where radiant heat is the dominant heat transfer mechanism. The best applications are those over 1400°F. This is the transition point of the effectiveness of radiant heating versus convection heating. Typical processes include hardening, annealing, sintering and brazing.
VACUDRAW® VACUUM TEMPERING FURNACES
Vacuum processing removes impurities with the advantages of heating and cooling under convection. The VacuDraw® incorporates an initial pump down to 50 microns to remove air, water vapor, etc. from the chamber. The goal in vacuum purged tempering is to cool the workload back down to ambient temperature to avoid workload discoloration and oxidation.
RX® ENDOTHERMIC GAS GENERATORS
Surface® Combustion pioneered the development of endothermic gas to be used as the carrier medium for today’s gas carburizing process. This revolutionized the heat treating industry from the pack carburizing process of yesterday and easily enabled the future of boost/diffuse carburizing, carbon control and all the instrumentation and sensors that grew out of this invention. Surface named this miracle endothermic gas with a tradename of RX® gas.
DX® EXOTHERMIC GAS GENERATORS
Surface® Combustion leads the way with a versatile exothermic design that is used in many annealing, normalizing and bluing applications used widely in the pipe, tube, wire and motor industries. It is created by burning natural gas, consisting mainly of nitrogen and hydrocarbons.