---
title: "Precipitation Hardening"
url: "https://uptonindustries.com/application/precipitation-hardening/"
description: "Upton internally and externally heated salt bath furnaces and automated salt bath systems for precipitation hardening and aluminum solution treating."
site: "Upton Industries"
updated: "2026-09-25T03:54:29+00:00"
breadcrumbs: "Home > Applications > Precipitation Hardening"
---

# Precipitation Hardening

Upton internally and externally heated salt bath furnaces and automated salt bath systems for precipitation hardening and aluminum solution treating.

3 Upton systems · Salt Bath

- **Process:** Precipitation Hardening
- **Equipment type:** [Salt bath furnaces](https://uptonindustries.com/application/precipitation-hardening/#route-salt)
- **Systems:** 3

[Request a quote for a precipitation hardening system](https://uptonindustries.com/contact/?need=equipment&equipment=salt-bath&ref=Precipitation%20Hardening)

## Plan your equipment

Send the alloy, part dimensions, load arrangement and required cycle, and we’ll discuss whether a heated salt bath furnace or an automated system suits the work.

## Salt bath furnaces

### [Automated Salt Bath Systems](https://uptonindustries.com/products/salt-bath-furnaces/automated/)

Upton configures automated salt bath systems with PLC controls and material handling for multiple processes.

### [Externally Heated Salt Pot Furnaces](https://uptonindustries.com/products/salt-bath-furnaces/externally-heated/)

Externally heated salt pot furnaces with carbon-steel or stainless-steel liners, electric resistance heaters or Upton Hurricane gas burners, for intermittent service.

### [Internally Heated Salt Bath Furnaces](https://uptonindustries.com/products/salt-bath-furnaces/internally-heated/)

Internally heated salt bath furnaces for non-chloride salts, with carbon-steel or stainless-steel liners.

## Externally or internally heated

Link: https://uptonindustries.com/application/precipitation-hardening/#compare-salt-heating

Both are steel-lined salt bath furnaces. They differ in where the heat enters the salt: through the wall of a pot, or directly in the bath.

*Fig. 1 Where the heat enters the salt. Section views, not to scale.*

*Externally Heated Salt Pot Furnaces & Internally Heated Salt Bath Furnaces compared*

|  | [Externally Heated Salt Pot Furnaces](https://uptonindustries.com/products/salt-bath-furnaces/externally-heated/) | [Internally Heated Salt Bath Furnaces](https://uptonindustries.com/products/salt-bath-furnaces/internally-heated/) |
| --- | --- | --- |
| Heat enters | From outside the pot, through its wall | In the salt, from heat sources immersed in the bath |
| Electric | Electric resistance heaters | Immersion heaters for lower-temperature work; air- or water-cooled electrodes with transformers at elevated temperatures |
| Gas | Upton Hurricane tangential burners, designed to minimize flame impingement on the salt pot | Radiant tubes |
| Suited to | Intermittent service | Non-chloride salt applications |
| Liner | Carbon steel or stainless steel, selected for the operating conditions | Carbon steel or stainless steel, selected for the operating conditions |
| Drawings (PDF) | [Round: Upton Externally Heated Salt Pot Furnace (Round)](https://uptonindustries.com/wp-content/uploads/2018/04/externally-heated-salt-pot-furnace-round.pdf); [Square: Upton Externally Heated Salt Pot Furnace (Square)](https://uptonindustries.com/wp-content/uploads/2018/04/externally-heated-salt-pot-furnace-square.pdf) | [Electrodes: Internally Heated Salt Bath Furnaces (Electrodes)](https://uptonindustries.com/wp-content/uploads/2018/04/upton-internally-heated-salt-bath-furnace.pdf); [Heaters: Internally Heated Salt Bath Furnaces (Heaters)](https://uptonindustries.com/wp-content/uploads/2018/04/upton-internally-heated-salt-bath-furnace-heaters.pdf) |

To quote either furnace, send us:

- Part sizes
- Load weight
- Process temperature
- The salt you plan to run

## Related processes

- [Austempering 3 shared systems](https://uptonindustries.com/application/austempering/)
- [Degreasing 3 shared systems](https://uptonindustries.com/application/degreasing/)
- [Descaling 3 shared systems](https://uptonindustries.com/application/descaling/)
- [Marquenching 3 shared systems](https://uptonindustries.com/application/marquenching/)
- [Martempering 3 shared systems](https://uptonindustries.com/application/martempering/)
- [Metal Cleaning 3 shared systems](https://uptonindustries.com/application/metal-cleaning/)

## Need a custom thermal solution?

Send us your process details to start a quote.

[Request a quote](https://uptonindustries.com/contact/?need=equipment&equipment=salt-bath&ref=Precipitation%20Hardening)