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TP 347 / UNS S 34700

Type 347 stainless steel has slightly improved corrosion resistance over type 321 stainless steel in strongly oxidizing environments. Type 347 is stabilized with columbium, it is preferable for aqueous and low temperature environments due to its good resistance to intergranular attack. Both 347 and 321 offer good resistance to polythionic acid stress corrosion cracking, encountered in oil refineries. The high temperature oxidation resistance of 347 is similar to that of 304 stainless steel. Useful to 1500°C. Maintains good corrosion resistance in applications where the temperature is between 800°F and 1500°F.• Good resistance to intergranular corrosion in the as welded condition.

Main applications: Refinery Heat exchangers, furnaces, boilers in chemical and petrochemical plant.

  • Heat Exchanger Tubes
  • Boiler Tubes & Pipes
  • Line Pipes
  • Hydraulic Tubes
  • Instrumentation Tubes
  • Structural Pipes
  • Mechanical Tubes & Pipes

TPS Technitube supplies TP 347 / UNS S 34700 in a big variety of forms incl.:

Chemical Composition

C = 0.08 % max S = 0.030 % max
Si = 0.75 % max Ni = 9.00-13.00 %
Mn = 2.00 % max Cr = 17.00-20.00 %
P = 0.040 % max Others = (Cu + Ta) Ž 10xC, max 1.00%

Mechanical properties all at room temperature

Elongation in 2 in or 50 mm, (or 4D), min 40%
YS min
KSI (MPa) = 30[205]
TS min
KSI [MPa] = 75[515]
El. Min 35

 

 

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    TPS-Technitube Röhrenwerke GmbH
    Julius-Saxler-Str. 7 | 54550 Daun/Germany
    Tel.: +49 65 92 71 20 | Fax: +49 65 92 1305
    www.technistock.de | www.tpsd.de | E-Mail: service@tpsd.de