Stainless Steel Capillary Tubes 347 Wst. 1.4550/1.4912 UNS S34700/S34709:-

Specification:  ASTM A 269/A 213/A 312
EN10216-5 /EN ISO 1127 D4/T3/EN 10305
PED 97/23 EC

Maximum exposure temperature: 850°C / 1560°F

Alloy 347 is an austenitic, niobium, stabilized stainless chromium-nickel steel. It has slightly imposed corrosion resistance over 321 stainless steel in strongly oxidizing environments and is preferable for aqueous and low temperature environments due to its good resistance to inter granular attack. The 347H has high carbon (0.4 to 0.1%) for better high temperature creep properties.

Characteristics:

  • Excellent resistance to inter granular corrosion due to niobium stabilization
  • Good resistance to organic aids and salt solutions
  • Sensitive to pitting and crevice corrosion
  • Less resistance to stress corrosion crashing by chloride solutions

Market applications:

  • Oil refineries
  • Fires heater tubes
  • Power plants
  • Heat exchanges
  • High chemical process
  • High temperature stream service 

Technical details

Technical composition (%) Fe Cr Ni Mn Si P C S Nb
347 min Bal. 17.0 9.0 - - - 0.040 - 8xC
max - 20.0 13.0 2.00 0.75 0.040 0.040 0.030 0.8
6MO min Bal. 17.0 9.0 - - - 0.040 - 10xC
max - 20.0 13.0 2.00 0.75 0.040 0.100 0.030 1.0

Mechanical Properties 347 347H
Tensile strenght (mpa, min) 515 - 690 515 - 740
Yield strength (0.2% offset mpa, min) 215 - 260 215 - 260
Elongation (%, min) 40 40
Density / weight (g / cm3 / kg) 7.9 7.9

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