Industrial Ovens - Heat Treating Furnaces
Lucifer Furnaces - Heat Treat Guide & FAQ's

The chart below describes various types of tool steels, their composition and appropriate heat treating applications.

Steel Composition Harden °F Temper °F Anneal °F Normalize °F Quench Atmosphere
A2 Medium Alloy 1700-1800 350-1000 1550-1600 0 Air * Air / Inert
A6 High Carbon 1800-1875 400-1000 1600-1650 0 Air * Air / Inert
D2 High Carbon 1800-1875 400-1000 1600-1650 0 Air * Air / Inert
O1 Oil Harden 1450-1500 350-500 1400-1450 1600 Oil * Air / Inert
W1 Water Harden 1400-1550 350-650 1360-1400 1450-1600 Water * Air / Inert
S7 Shock Resisting 1650-1750 400-1200 1500-1550 0 Oil * Air / Inert / Natural Gas
H13 Hot Work Alloy 1825-1875 1000-1200 1550-1650 0 Air / Oil * Air / Endo.
M2 Molybdenum High Speed 2150-2250 1000-1200 1600-1650 0 Air / Oil / Salt * Air / Endo.
T2 Tungsten High Speed 2300-2375 1000-1100 1600-1650 0 Air / Oil / Salt * Air / Endo.
1040 Medium Carbon 1550 1550 1550 1650 Water ----
4130 Alloy Steel 1600 0 1575 1625 Oil ----
4140 Medium Carbon 1575 400-1200 1550 1600 Oil * Air / Dis. Ammonia

Consult with a metallurgist or steel supplier for exact temperature ranges and type of atmosphere for the desired steel finish.

Frequently Asked Questions
Which do I need… a FURNACE or an OVEN…?
How should I maintain my furnace or oven?
What replacement parts should I have on hand?
Why use a protective atmosphere?
What is the difference between the GT and AM models?
Why use stainless steel foil wrap?
Are your furnaces and ovens NADCAP approved?
Why are low watt density heating elements important?
Which do I need… a FURNACE or an OVEN…?

The temperature you need to heat treat your material at will typically give you the answer:  A FURNACE when you are above radiant heat (1300°F) and an OVEN with air recirculation when you are below.

How should I maintain my furnace or oven?

To maintain the utmost accuracy and extend the life of your heating elements, you should replace the thermocouples at least once a year.  The sensing tips on the thermocouples degrade over time and begin to lose accuracy causing the heating element to work harder, shortening element life.

What replacement parts should I have on hand?

You should always have an extra heating element on hand to avoid unexpected downtime  as well as the expense of overnight delivery. 

Why use a protective atmosphere?

A protective atmosphere is used when exposure to air atmosphere may cause an undesirable chemical reaction with your parts.  Note that if your parts are being cleaned or machined afterwards, the use of air atmosphere may be suitable.  At Lucifer Furnaces we can provide you with a furnace using an inert protective atmosphere including nitrogen, argon or helium.  Inert atmospheres can be used in a GT model furnace or an AM model furnace.

What is the difference between the GT and AM models?

Both our GT and AM models are designed for use with inert protective atmospheres.  GT Models are designed with a continuously welded furnace shell and gasketed door for operation with a positive flow of inert atmosphere.  GT Models are best suited for constant operation to maintain a dry refractory environment in the work area to minimize oxidation on workloads.  GT Models are a less expensive alternative compared to AM Models

AM Models are equipped with an alloy muffle (retort) which separates the refractory and heating elements from the workload and atmosphere to minimize scale and oxidation on most tool steels. The design of the AM Models achieves lower dew points, reduced atmosphere consumption and allow shorter purge times. 

Why use stainless steel foil wrap?

Stainless steel foil wrap will minimize decarburization and scale on most tool steels processed under normal air atmosphere.
 

Are your furnaces and ovens NADCAP approved?

NADCAP accreditation has to do with a company's compliance with certain specifications.  There is no such thing as a NADCAP approved furnace or oven.  Lucifer Furnaces can build your furnace or oven to comply with the requirements of AMS 2750D, a common furnace specification cited in NADCAP requirements for heat treating.  It is your company or your process that becomes NADCAP accredited.  If you are thinking about NADCAP accreditation, be sure to mention that when you are buying equipment.

Why are low watt density heating elements important?

With low watt density heating elements the heat is spread out over a greater surface area; the result being that low watt density heating elements burn out less frequently (they last longer) than higher watt density elements. Longer lasting elements reduce operating costs.

Heat Treat Ovens-Industrial Furnaces from Lucifer Furnaces 2048 Bunnel Road - Warrington, PA 18976
 
 

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