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.