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Wed Mar 7 20:46:28 EST 2007


Iron content above calculated as balance.
Allegheny Ludlum Stainless Steel Type 439, a titanium stabilized, 18 =
percent chromium alloy, also known as ASTM XM-8 and by the UNS =
designation S43035, is a ferritic stainless steel designed to resist =
corrosion in a variety of oxidizing environments from fresh water to =
boiling acids. It may be used in either the annealed, cold formed or =
as-welded condition. Type 439 may also be used in many oxidizing =
environments where Type 304 is considered adequate in term of general =
corrosion resistance but is subject to chloride stress corrosion =
cracking.<\p>
The composition of Type 439 stainless steel has been balanced to provide =
a completely ferritic structure at all temperatures, to avoid the loss =
of ductility after welding and to provide resistance to intergranular =
corrosion. Type 439 does not require annealing after welding to restore =
ductility or to provide intergranular corrosion resistance.
Excellent resistance to stress corrosion cracking, good weldability, =
high thermal conductivity and low thermal expansion characteristics make =
Type 439 stainless steel and ideal consideration for many applications. =
For shell and tube heat exchangers where carbon steel shells are used =
with Type 439 tubes the close match of thermal expansion coefficients =
may possibly eliminate the need for an expansion joint in the heat =
exchanger. Type 439 has a low carbon content making it an attractive =
consideration for nuclear applications. Type 439 also provides good =
oxidation and corrosion resistance for many automotive exhaust system =
components and residential furnace primary heat exchangers.
Information provided by Allegheny Ludlum Corporation.


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