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"Titanium Enhanced" Stainless Steel
Central Boiler SCL models are manufactured using "Titanium Enhanced" Stainless
Steel.
"Titanium Enhanced" Stainless Steel is the
stainless alloy of choice based on its ability to withstand
the stress, corrosive environment, and high temperatures that are exerted
on your firebox during operation. Carbon steel
(used in Central Boiler CL models) also
has all the characteristics that you are looking for when deciding
on a durable firebox material.
Other stainless steel
alloys simply fall short of what it takes to withstand the stresses and corrosive
environment that outdoor wood furnace metals are exposed to while they are in use.
" Leaders in product quality, design, and innovation."
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Stress Corrosion Cracking
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Stress Corrosion Cracking (SCC) is defined as: the failure induced by the combined
influences of tensile stress
and a corrosive environment.
Combinations of the following conditions can cause SCC: (1) presence of halide
ions (generally chloride),
(2) residual tensile stresses, and (3) temperatures in excess of about 120°F (49°C).
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Below are two graphs that illustrate
how three outdoor wood furnace metals
(Carbon Steel, "Titanium Enhanced" Stainless Steel, and 304L Stainless Steel)
react to the high temperatures exerted on them during operation.
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Thermal Expansion
Thermal expansion is the expansion in metal resulting from an increase in temperature.
The greater the expansion rate, the greater the chance of SCC (Stress Corrosion Cracking)
to occur in the metal.
304L Stainless Steel has nearly double the expansion that "Titanium Enhanced" Stainless
Steel and Carbon Steel have.
This graph reflects the expansion amount on a
4'x 4' sheet of metal.
References: Mechanics of Materials, Beer and
Johnston
Material Property Data, MatWeb
Thermal Conductivity
Heat is normally conducted by atoms literally bumping into each other. Metal electrons
add to this flow of heat, which is why metals tend to be good conductors of heat. The
measure of how good a material is at conducting heat is known as its thermal conductivity.
Thermal conductivity is defined as the rate at which heat flows through material.
A firebox material with higher thermal conductivity will boost the efficiency of your outdoor wood furnace
by transferring more Btu's into the water jacket, instead of out your chimney.
References: Standard Handbook for Mechanical Engineers,
Baumeister & Marks
National Physical Laboratory, Internet
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Ferritic Stainless Steel
"Titanium Enhanced" Stainless Steel
Ferritic stainless steels have very useful corrosion resistant properties, such as resistance to chloride SCC, corrosion in oxidizing aqueous media, oxidation at high temperatures, and pitting and crevice corrosion in chloride media.
Resistance to stress-corrosion cracking is the most obvious advantage of the ferritic stainless steels. Ferritic steels, particularly those that are nickel-free, resist chloride and SCC very well.
References: Technical Data Blue Sheet, Allegheny Ludlum
Chemical Engineering, Oct 18, 1982
Austenitic Stainless Steel
304L Stainless Steel
Type 302, 304, 304L and 305 alloys are the most susceptible of all the Austenitic Stainless
Steels to SCC.
References: Technical Data Blue Sheet, Allegheny Ludlum
Chemical Engineering, Oct 18, 1982
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Click here to inspect
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This is actual Low Carbon Austenitic Stainless Steel cut out of a wood furnace that failed due to Stress Corrosion Cracking. |
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Browse our furnace models to find which SCL "Titanium Enhanced" Stainless Steel model will best fit your application.
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A safe, efficient outdoor furnace that can provide 100% of your heating needs.
Central Boiler manufactures and distributes the Classic Outdoor Wood Furnace, an Outdoor Wood-fired
Hydronic Heater that heats multiple buildings, hot tubs, pools, greenhouses, domestic water and more.
While burning a wood stove indoors can mean many problems, there is an alternative... The Classic outdoor wood furnace
from Central Boiler. Also known as an outdoor wood boiler, this Outdoor Wood-fired Hydronic Heater eliminates the problems associated with indoor burning and allows you to get
even more benefits from wood heat. This outdoor furnace can actually improve the indoor environment in your home or
business, while eliminating the time-consuming chore of tending a traditional wood stove.
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