Manufacturer of salt bath furnaces upton industries. Saltbath nitriding 3 can be an economical method providing that both the saltbath chemistry and cleanliness are maintained fig. Saltbath furnaces for heat treatment of steel or light. Investigation of surface hardness of steels in cyanide salt. It discusses the important applications of various furnace designs. Minisalt bath calibrators msb ship preprogrammed, and with two mounting plates on top of the bath. Furnace covers can reduce heat losses up to 50% during idling or down periods. Testing was carried out to evaluate the performance heattreatment processes and for various.
Since then theyve gained wide recognition and the number has grownnot only in number but in size and capacity. A salt bath furnace is basically a ceramic or metal container filled with molten salt into which work is immersed for either heating or cooling. Each pot is double welded with an extra wide flange to provide the best service life for low temperature heat treating and tempering applications. Salt bath furnace with only refractory lining showing heat flux from the heating coils through the refractory insulation to the shell. Sep 26, 2002 dealing with used salt by conventional methods.
Salt bath heat treatment and equipment steel heat treating. These heat treat furnaces save you money when treating large volumes of material per hour with exceptional uniformity and low maintenance. Clear creek furnace, salt lick, bath county, ky library. For pressurized gas, the furnace should have a minimum quench pressure of 4 bars. We have larger fluidized baths for volume production runs of material as well as a small bench.
Features of salt bath furnace 1 heating without contacting air is possible, preventing oxidation and decarburization. The capture hood in a requires a ventilation rate of 200 m3min 7120. Salt bath tutorial with master bladesmith tim zowada from tim zowada custom knives. Recommended for both commercial and inhouse heat treating. Salt bath furnaces industrial gas burners manufacturer. A work part immersed into a molten salt is heated by heat transferred by conduction. Waterglycol mixtures are very common solutions for most lowtemperature heating applications, and can typically be used up to 250f. Finite element analysis of heat transfer through salt bath.
Complete outer furnace shell casing for safety and strength. In combination in a salt bath furnace for operating at bath temperatures of about 2 f. Finite element modeling of heat transfer in salt bath furnaces. When parts are immersed in the molten salt, heat is transferred by direct contact to the surface. Furnace specifications include maximum temperature of 3000 degrees c, maximum volume of 2200 l, inner width ranging from 150 mm to 300 mm, inner depth ranging from 150 mm to 1150 mm, inner height ranging from 150 mm to 350 mm, outer width ranging from 610 mm to 1140 mm, outer depth ranging from 470 mm to. The gifathermprocess was an outstanding success for nabertherm. The work can be immersed for either heating or cooling. Ceramic salt bath furnaces through the unique submerged electrode placement design, the electrodes do not occupy any portion of the bath. The other had an additional airgap insulation formed by. Until now it has been common practice to pump the hot liquid salt into drums and allow it to cool and harden before cutting open the drum and breaking up the salt for disposal.
More precise temperature uniformity is available upon request. Investigation of surface hardness of steels in cyanide. Pdf this research work is centered on the design of a low cost efficient salt bath furnace using locally sourced materials for the purpose of. Development and performance evaluation of a salt bath furnace. Upton industries began as a manufacturer of molten salt bath equipment in 1937 with the advent of the submerged electrode design which has since become the industry standard for electric salt bath furnaces. Our low temperature salt bath furnace comes standard with a 3 8thick heavy duty welded steel pot constructed of sae30 grade 70 pressure vessel quality steel.
Salt bath hardening can offer advantages over alternative hardening and tempering methods. Salt bath furnace production started inhouse salt bath furnaces sales started introducing american technologies for atmosphere furnaces and aluminum furnaces vacuum heat treatment furnace production and sales started lteq low temperature hardening process technology released ion plating equipment production and sales started. Us2516516a us715161a us71516146a us2516516a us 2516516 a us2516516 a us 2516516a us 715161 a us715161 a us 715161a us 71516146 a us71516146 a us 71516146a us 2516516 a us2516516 a us 2516516a authority us united states prior art keywords bath furnace working area area salt bath prior art date 19461210 legal status the legal status is an assumption and is not a. Whether your cover is a lightweight lowprofile pan type f max or a heavyweight highprofile manual or automated rolling cover 2400f max ajax can replace it to oem. Heat flow patterns in two salt bath furnaces are studied in this work using finite element fe analysis. The heat treatment processes were performed at different temperatures ranging from 790oc to 920oc. The heating medium is a hot liquid compound, normally referred to as salt, and is contained in a metal pot, heated by external electrical currents or submerged heaters. Salt bath furnace all industrial manufacturers videos. Whether your cover is a lightweight lowprofile pan type f max or a heavyweight highprofile manual or automated rolling cover 2400f max ajax can. Fluidized temperature baths typically provide faster processing times than ovens and furnaces and are much more thermally stable and uniform. A work part immersed into a molten salt is heated by heat transferred by conduction combined with convection through the liquid media salt bath.
In this regard furnace brickwork must be such that heat application to the bath is even and local hot spots do not arise. The furnace design depends on the required throughput, the process requirements for the heat treatment, such as the process temperature and atmosphere or the required cycle time. The steels, after preheating, were heated in a diesel fired salt bath heat treatment furnace and then quickly quenched in different media including air, oil and brine. Furnace specifications include maximum temperature of 3000 degrees c, maximum volume of 2200 l, inner width ranging from 150 mm to 300 mm, inner depth ranging from 150 mm to 1150 mm, inner height ranging from 150 mm to 350 mm, outer width ranging from 610 mm to 1140 mm, outer depth ranging from.
Automated salt bath systems upton automated salt bath systems can be custom designed with integrated multiple process capability. Salt baths increase metallurgists level of flexibility in how they conduct the process of heat treating steel. A salt bath furnace was developed using electrical heating as source of heat which can be used in tertiary institution laboratories as well as by small and medium. Molten salt quenchants automated salt bath furnace line for heat treating highspeed steel tools includes a salt quench furnace and aircool conveyor. Ep0919642b1 method for treating surface of ferrous. They are used for processes such as nitriding according to tenifer up to 600 c, carburization to 950 c or bright annealing to c.
Saltbath furnace production started inhouse saltbath furnaces sales started introducing american technologies for atmosphere furnaces and aluminum furnaces vacuum heat treatment furnace production and sales started lteq low temperature hardening process technology released ion plating equipment production and sales started. Introduce the furnace categories of hkfurnace company, such as car bottom furnace, pit furnace, box furnace, melting furnace, salt bath furnace. The salt bath furnaces ts 2015 tsb 9080 can be used for heat treatment of metals in neutral and active salt baths. Photo, print, drawing clear creek furnace, salt lick, bath county, ky enlarge view 3 images in sequence. Internally heated salt bath furnace uds model 1 author. Salt baths are often used instead of conventional atmospheric furnaces for many heat treatment applications. Clear creek furnace, salt lick, bath county, ky library of. It describes two general types of salt bath systems for steel hardening. This bath is periodically and routinely cleaned using either silica or methyl chloride rectifiers in conjunction with a carbon or graph. The salt bath was designed and manufactured virtually using cadcam procedures, after which the production and assembling was carried out. Pdf development and performance evaluation of a salt bath.
Hkfurnace is a global supplier of industrial equipment and modern technologies for heat processing, has been designing, engineering, and manufacturing industrial furnaces and other heating equipment for 50 years. Automated salt bath furnace line for heat treating highspeed steel tools includes a salt quench furnace and aircool conveyor. Pdf process modeling of aluminum scraps melting in molten. The bath s composition consists of one or more salts, nitrates, chlorides, carbonates, cyanides, caustics, or additives in small amounts. Nov 10, 2000 salt bath hardening operation, where the components are heated in a salt bath furnace and quenched to room temperature, cryogenic treatment for stabilization of martensitic microstructure, and tempering operation for obtaining a desirable combination of strength, hardness and toughness. Development of laboratoryscale salt bath furnace semantic. The salt bath furnace showing temperature gradients during heat transfer in the furnace. In addition to gas nitriding, ferritic nitrocarburizing fnc is a related nitriding process which is gaining much popularity due to the specific wear and anticorrosion properties offered, including coupling with postprocess high temperature oxidation. From the results obtained, it was observed that the salt bath furnace has fast heating rate 12.
Bath neutrality the neutrality of the salt is main tained to prevent harmful reactions between the salt and the surface of the steel. Furnace hkfurnace companys catalogue of industrial furnaces. Oct 05, 2017 salt bath tutorial with master bladesmith tim zowada from tim zowada custom knives. This research work is centered on the design of a low cost efficient salt bath furnace using locally sourced materials for the purpose of carrying out thermochemical treatments of small and minor components for improved properties in service. A material selector software aided in the materials selection, where. When the bath is refilled, new granular salt is needed, which needs to be gradually melted. The salt bath furnace can be utilized for conventional parts. Process modeling of aluminum scraps melting in molten salt and metal bath in a rotary furnace conference paper pdf available in tms light metals february 2004 with 889 reads how we measure. Numerous customers and interested parties came to our stand to find out about our latest furnace developments and to discuss together with our experts about solutions for heat treatment of metals and for melting and holding in the foundry. Process modeling of aluminum scraps melting in molten salt. A support pole, sensor holder, and clip are included in your purchase.
Available in either 120vac or 240vac, edl will accommodate a cord configuration to match your home countrys power requirement. The high temperature salt bath provides an airoxygenfree medium for heating steels which greatly reduces oxidation, decarburizing, and scaling of work. Salt bath heat treatment on the phoenix knife by kevin. The heat transfer rate in a liquid media is much greater than that in other heating mechanisms. The 5000 in use today range in size to 43 ft l x 20 ft d x 8 ft w. Choosing to recover salt eliminates disposal and reduces operating costs. Salt bath heat treatment by master smith kevin cashen is part 2 of 3 in the series on the phoenix knife project. Salt baths are very uniform and accurate and can be used up to1,800 degrees f. Accurate thermal systems offer several models of fluidized baths that provide very stable and uniform temperature environments for nitinol shape setting, heat treatment, annealing, tempering, thermal stress analysis and heat setting of various metal components, parts and assemblies. Fluidized baths are safer to operate than molten salt baths while immersed objects come out clean and dry with no material to remove. This bath is periodically and routinely cleaned using either silica or methyl chloride rectifiers in conjunction with a. Furnace is easily restarted without the assistance of external devices. The furnace has a ceramic or metal container filled with molten salt. The bath solution is heated by a fire tube style burner submerged at the bottom of the heater vessel.
One design had a purely refractory brick backup after the embedded heating element with ceramic fiber blanket insulation and is2042 type ii hot face and is2042 type iii cold face insulation just before the outer steel shell. Mar 11, 20 salt bath heat treatment by master smith kevin cashen is part 2 of 3 in the series on the phoenix knife project. Salt bath furnaces c borel swiss standard furnaces. Furnace covers pdf covering the top of a salt bath furnace when it is not being used is simply sound economics.
Lindbergmph has long been a leader in the design and manufacture of thermal processing box furnaces. As the workpiece surface is covered with the salt during transfer from the furnace to the quench oil bath or water bath, oxidized scale and decarburization do not take place. Pdf development and performance evaluation of a salt bath furnace. With other quenching media, metals of varying shape or hardness can display a tendency to warp or twist during the process. Salt has to be used above its melting point of about 150c 300f, and, because of its oxidizing nature, combustible or incompatible materials should definitely be kept out of the salt bath to avoid the. Molten salt bath heat treatment metallurgical solutions, inc. Fluidized temperature baths accurate thermal systems.
It is mandatory that the saltbath chemistry is checked at the commencement of each shift and that the appropriate additions of salt are made to return the bath to its operational strength. Covering the top of a salt bath furnace when it is not being used is simply sound economics. Home nabertherm industrial furnace manufacturing glass. Resistance style immersion heaters are easily replaceable without emptying the furnace. Gas nitriding furnaces, ferritic nitrocarburizing fnc.
I found controllers that would work, but i ended up buying a package from south eastern heaters because don fogg had proven it would work, and i got a guarantee that the controller would work. The highheat salt bath is the critical operation in salt line hardening. The phoenix knife was originally created by several members of the abs board. The principals of operation of a salt bath heater are similar to that of a water bath heater. A salt bath furnace was developed using electrical heating as source of heat which can be used in tertiary institution laboratories as well as by small and medium scale enterprises smes. Fic 6 ventilation of a salt bath furnace with a a capture hood and b a canopy hood. Salt bath furnace ts 9080 with a salt bath thermocouple for heat treatment of steel salt bath furnace ts 3018 with two salt bath thermocouples for heat treatment of aluminum salt bath furnaces have an excellent temperature uniformity and ensure very good heat transfer to the work piece. Fast heat up of immersed parts and objects is another major advantage. Since the parts are immersed in the salt bath, air cannot contact the work piece and. Molten salt is often considered the ideal heat treating medium.
Saltbath furnace ts 9080 with a salt bath thermocouple for heat treatment of steel saltbath furnace ts 3018 with two salt bath thermocouples for heat treatment of aluminum saltbath furnaces have an excellent temperature uniformity and ensure very good heat transfer to the work piece. This article provides information on the salt baths used for a variety of heat treatments, including heating, quenching, interrupted quenching austempering and martempering, case hardening, and tempering. Development of laboratory scale salt bath furnace 1. Furnace development about 30 years ago, the first important salt bath furnace installation was made in this country.
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