347 Spiral Wound Gaskets
Item No.:ZD-G1206/347
Description:
347 (UNS S34700) is a stabilized
stainless steel which offers as
its main advantage an excellent
resistance to intergranular
corrosion following exposure to
temperature in the chromium
carbide precipitation range from
800 to 1500 oF (427
to 816 oC). Alloy 347
is stabilized by the addition of
columbium and tantalum.
347 stainless steel is also
advantageous for high
temperature service because of
its good mechanical properties.
347 offers higher creep and
stress rupture properties than
SS304.
In order to adapt to the strict request, we according to requirements provide 347 spiral wound gaskets. According to the flange structure, spiral wound gasket with or without 347 inner rings, 347 hoop, CS outer ring. 347 inner ring as the same as 347 strip.
General
Properties:
347 is stabilized stainless
steel;
347 is stabilized by the
addition of columbium and
tantalum.
Chemical
Composition:
Resistance to
Corrosion:
347
is preferable for aqueous and
other low temperature
environments then 321 stainless
steel;
347
is used primarily in high
temperature applications where
high resistance to sensitization
is essential, thereby preventing
intergranular corrosion at lower
temperatures;
347 have excellent resistance
applications in intergranular
corrosion.
Stress Corrosion
Cracking:
Alloy 347 is particularly useful
under conditions which cause
polythionic acid stress
corrosion of non-stabilized
austenitic stainless steel, such
as SS304;
347 have good elevated temperature oxidation resistance.
Physical
Properties:
The
stabilized 347 is generally
without magnetic;
The elevated temperature creep
and stress rupture strengths of
the stabilized steels are higher
than 304 and 304L;
347 have excellent toughness at
room and sub-zero temperatures;
The fatigue endurance limits of
347 is approximately 35% of its
tensile strengths.
