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Evenheat Salt Bath 709 Installation And Operating Manual

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Salt Bath Manual Index
Stand Assembly & Kiln Placement
Statement of Use - Overview of Salt Bath Operation
The salt bath heat treating process involves heating solid heat treating salts to a given temperature which causes them to liquefy by heat (become molten). These
salts are contained within a vessel that is commonly known as a salt pot. Once the salts become molten, and at the desired heat treat temperature, steel work-pieces
(blades, receivers, tools, etc.) are immersed into the molten salts and are allowed to remain there for the desired time period. Once the desired time period has
elapsed, the work-pieces are removed from the molten salt to undergo further processing as necessary.
Advantages of the salt bath heat treat process include a heat treat environment that is absent of oxygen. Oxygen oxidizes and decarburizes steel when taken to
temperature: neither effect is generally preferred in the finished product. Also a salt bath, by its nature, tends to offer phenomenal temperature distribution
throughout the work piece.
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Salt Bath 709 / 718 / 818
Installation and Operating Manual
North American Model
June 2019
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Summary of Contents for Evenheat Salt Bath 709

  • Page 1: Table Of Contents

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Salt Bath Manual Index Statement of Use – Overview Standard/Everyday Use Wear Personal Protective Equipment Safety Turn on Any Ventilation Systems Warning Symbol Descriptions...

  • Page 2: Safety

    SAFETY Read and understand this installation and operating manual as well as the controls manual before operating your salt bath heat treat kiln. If you have any questions please contact Evenheat Kiln at 989-856-2281 or at evenheat-kiln.com. Warning Symbol Descriptions Warning symbols are used throughout this manual.

  • Page 3: Electrical Safety

    Pay attention to them, inspect them periodically and do not defeat them. Evenheat recommends that a voltage check be performed before placing the kiln into service, ideally before actual purchase. Operating voltage varies. The kilns operating voltage (printed on the kilns nameplate) must match the applied voltage (actual electrical service voltage).

  • Page 4: Kiln Use Safety

    Evenheat salt bath kilns are designed for the heat treatment of carbon steels only. Do not attempt to heat treat any material other than carbon steels or stainless steels.

  • Page 5: Kiln Maintenance Safety

    Replace any worn, damaged or defective parts immediately with Evenheat Kiln replacement parts only. Discontinue use until parts are replaced. If vacuuming the kiln use only HEPA filters on the vacuum. Prolonged expose to brick dust and other refractory materials can cause lung injury.

  • Page 6: Setting Up The Salt Bath Kiln

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 The salt bath kiln is designed to provide electrical grounding for the salt pot (and by extension, the molten salt) and temperature sensing thermocouples.
  • Page 7 Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Make a Square by Placing Frame Angles as Shown Attach Each Leg Using the Included Nuts and Bolts as Shown Place Plastic Feet on Each Leg as Shown...

  • Page 8: Thermocouple Installation

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Thermocouple Installation The Salt Bath kiln uses 3 thermocouples for control. The Over-Temp (high limit) has been installed at the factory. The Chamber and Immersion thermocouples must be installed.

  • Page 9: Chamber Thermocouple

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Chamber Thermocouple (#2, middle jack) - Installation The purpose of the chamber thermocouple is to measure the temperature of the space between the firing chamber walls and the salt pot. It’s not intended to be inserted into the salt bath.
  • Page 10 Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Chamber thermocouple assemblies properly assembled. Insert the Chamber thermocouple into the chamber through the left-rear corner as shown. An insertion hole has been provided.

  • Page 11: Immersion Thermocouple

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Immersion Thermocouple (#3, upper jack) - Installation The purpose of the Immersion thermocouple is to measure the temperature of the salt bath itself. That is to say that the immersion thermocouple is immersed into the molten salts during operation.

  • Page 12: Salt Pot Ground Strap Installation To Control Panel

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Position the immersion thermocouple under the bracket and tighten Plug the Immersion thermocouple into the #3 jack (upper jack) the inner 2 nuts as shown. The immersion thermocouple is now set- and attach the ground onto the ground stud as shown.

  • Page 13: Prepare The Salt Pot Ground Lug

    Your salt pot must be at least 4” deeper than the chamber depth (9” chamber depth means minimum 13” pot depth, 18” chamber depth means minimum 22” pot depth) and be fitted with a grounding lug. Salt pots purchased from Evenheat will meet these specifications. If you intend to provide your own salt pot you must provide for an electrically conductive grounding lug.

  • Page 14: Placing The Lid Onto The Chamber

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Placing the Lid onto the Chamber Your lid will have an access hole machined into it that will be slightly larger (or should be) than the salt pot. It will also have a notch that allows for clearance of the salt pot ground lug.

  • Page 15: Installing The Lid Drip Shield

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Installing the Lid Drip Shield Place the lid drip shield on the lid. The lid drip shield should be placed with the broken edge towards the control panel as shown.

  • Page 16: Charging (Filling) Your Salt Pot

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Charging (Filling) Your Salt Pot Put on Your Personal Protective Equipment Before approaching and working with the salt bath kiln wear all personal protective gear which includes a face shield, goggles, gloves, long sleeves of cotton or leather (do not wear any synthetic clothing) and respirator (if required by salt choice).

  • Page 17: Programming The Tap Control To Achieve Molten Salt

    Let’s discuss these 3 things one at a time and in order: Temperature Rate (Speed): The TAP uses a degrees-per-hour format for controlling the speed at which the heat will increase. Evenheat recommends a heating rate of no faster than 1000°F per hour (537°C per hour).

  • Page 18: Adding Additional Salt To Make Final Volume

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Adding Additional Salt to Make Final Volume As noted previously, as the TAP control heats the salts, the salts will become molten. Once molten, remaining salts needed to make the final volume can be added to the salt pot.

  • Page 19: Charging Complete

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 The TAP display will indicate that you are using the Immersion thermocouple via the screen. You’ll note in the Kiln Temp row that “Imm…” is displayed. This After about 10 minutes of screen inactivity a large text indicates that the Immersion thermocouple is being used for control.

  • Page 20: Standard/Everyday Use

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Standard/Everyday Use Wear Personal Protective Equipment Before approaching and working with the salt bath kiln wear all personal protective gear which includes a face shield, goggles, gloves, long sleeves of cotton or leather (do not wear any synthetic clothing) and respirator (if required by salt choice).

  • Page 21: Inserting The Immersion Thermocouple Into The Molten Salt Bath

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Inserting the Immersion Thermocouple into the Molten Salt Bath Once the salts have become molten immerse the clean Immersion Thermocouple into the salt bath and secure it to the salt pot with the mount. We have said it before in this manual, but we are going to say it again: any material that is placed into the molten salt bath must be absolutely clean and free of any grease, water, moisture or other contaminant.
  • Page 22 Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 The TAP display will indicate that you are using the Immersion thermocouple via the screen. You’ll note in the Kiln Temp row that “Imm…” is displayed. This After about 10 minutes of screen inactivity a large text indicates that the Immersion thermocouple is being used for control.

  • Page 23: Inserting Work-Pieces For Heat Treating

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Inserting Work-Pieces for Heat Treating Before immersing any work-piece, hangers, tools etc. into the salt bath be sure that all items are entirely clean and free of any grease, oil, water, moisture or other contaminants.

  • Page 24: Pulling Your Work-Piece From The Salt Bath

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Pulling Your Work-Piece from the Salt Bath Once your work-piece has remained in the salt bath for the desired period of time it is then removed for further processing. Keep in mind that the items removed from the salt bath are very hot as they are the temperature of the molten salt.

  • Page 25: Evenheat Salt Bath Kiln Features

    Evenheat does offer salt pots for sale that are equipped with grounding hardware included. If you intend to provide your own salt pot we require that a grounding mechanism be included in your design. Please see the end of this manual for design specifications.

  • Page 26: Solid State

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Solid State The salt bath kilns are standard equipped with our Quiet Drive Solid State relay system. The salt bath process can be a lengthy process with a whole lot of on-and-off action controlling the heating elements.

  • Page 27: Salt Bath Maintenance

    Evenheat supplies salt pots fabricated from 316 Stainless. Salt pots can be made from a variety of other metals as well. During use the salt pot with oxidize and produce scale. This scale will fall away from the pot and find its way to the floor and interior walls of the chamber. Evenheat recommends that you vacuum away this scale on a periodic basis, perhaps every 15 to 20 times of use (depending upon pot material).

  • Page 28: Salt Leaks

    Evenheat cannot be responsible and does not warrant for damage caused by salt pot leaks. Yikes! Molten salts from a leaky pot can destroy the kilns firebrick and heating elements quickly.

  • Page 29: Replacement Parts List

    Any material that you chose for your salt pot must be made of an electrically conductive material. Evenheat salt pots are designed to extend at least 1-1/2” above the top surface of the kiln lid. This added length allows for placement of the salt pot ground. If you provide your own salt pot please make sure your design includes this feature.

  • Page 30: Nu-Sal Heat Treat Salt Working Temperatures

    Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Du-Bois Chemicals Co. gives the following melting point and working temperature range for Nu-Sal as: Melting Point: 1230°F (665°C) Working Temperature Range: 1300-1650°F (704-899°C)
  • Page 31 Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Nu-Sal SDS page 2 of 7 Page 31 of 36...
  • Page 32 Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Nu-Sal SDS page 3 of 7 Page 32 of 36...
  • Page 33 Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Nu-Sal SDS page 4 of 7 Page 33 of 36...
  • Page 34 Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Nu-Sal SDS page 5 of 7 Page 34 of 36...
  • Page 35 Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Nu-Sal SDS page 6 of 7 Page 35 of 36...
  • Page 36 Salt Bath 709 / 718 / 818 Installation and Operating Manual North American Model June 2019 Nu-Sal SDS page 7 of 7 Page 36 of 36...

This manual is also suitable for:

Salt bath 718Salt bath 818

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