• Subscribe
    Fill something at the
    'Theme option > Overall Elements > Top Bar > Top Bar Subscribtion' section
  • Login
contact: sales@scimetals.com

347 STAINLESS (S34700)


The following specifications cover Stainless Steel 347

  • AISI 347
  • AMS 5512
  • AMS 5556
  • AMS 5558
  • AMS 5571
  • AMS 5575
  • AMS 5646
  • AMS 5654
  • AMS 5674
  • ASTM A167
  • ASTM A182
  • ASTM A193 (347, B8CA)
  • ASTM A194 (347, B8CA)
  • ASTM A213
  • ASTM A240
  • ASTM A249
  • ASTM A269
  • ASTM A271
  • ASTM A276
  • ASTM A312
  • ASTM A314
  • ASTM A320 (347, B8CA)
  • ASTM A336
  • ASTM A358
  • ASTM A376
  • ASTM A403
  • ASTM A409
  • ASTM A430
  • ASTM A473
  • ASTM A479
  • ASTM A511
  • ASTM A554
  • ASTM A580
  • ASTM A632
  • ASTM A774
  • ASTM A778
  • ASTM A813
  • ASTM A814
  • DIN 1.4550
  • MIL A-23196
  • MIL S-23195
  • MIL S-23196
  • MIL T-6737
  • QQ S763
  • QQ S766
  • UNS S34700

Property Results

Related Metals:

  • Project 70 347(tm)
  • 8R40(tm)


Chemistry Data :

Carbon 0.08 max
Chromium 17 – 19
Iron Balance
Manganese 2 max
Nickel 9 – 13
Niobium Min:5 x C
Phosphorus 0.045 max
Silicon 1 max
Sulphur 0.03 max

Principal Design Features Similar to 321 stainless, 347 uses columbium as a stabilizing element to maximize its principal feature: resistance to intergranular corrosion. It can be used in applications requiring repeated heating in the range of 800 and 1650 F (427-899 C).

Applications High temperature gaskets and expansion joints, rocket engine parts, aircraft collector rings and exhaust manifolds and chemical production equipment.

Machinability Slightly tougher than 304 stainless, this material will produce the same tough stringy chips. The use of slow speeds and constant positive feeds will minimize this alloy’s tendency to work harden.

Welding 347 may be welded by all commonly used fusion and resistance methods. Oxyacetylene welding is not recommended. When necessary, use AWS E/ER347 filler metal.

Hot Working Working temperatures of 2100-2250 F (1149-1232 C) are recommended for forging, upsetting and other hot work processes. Do not work this alloy at temperatures below 1700 F ( 927 C). Material must be water quenched or fully annealed after working to reattain maximum corrosion resistance.

Cold Working Although this material requires higher initial forces than 304 stainless, it is quite tough and ductile and can be readily stamped, blanked, spun and drawn.

Annealing 1850-2000 F (1010-1093 C), water quench. This procedure will result in maximum ductility. For maximum corrosion resistance, see the note on stabilizing anneal under corrosion.

Hardening This alloy does not harden by heat treating. Elevated properties may only be obtained through cold reduction.

Physical Data :

Density (lb / cu. in.) 0.29
Specific Gravity 8.03
Specific Heat (Btu/lb/Deg F – [32-212 Deg F]) 0.12
Electrical Resistivity (microhm-cm (at 68 Deg F)) 438
Melting Point (Deg F) 2600
Modulus of Elasticity Tension 28



Limitation of Liability and Disclaimer of Warranty: In no event will South Coast Industrial Metals or any of its affiliates be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. South Coast Industrial Metals, Inc. assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.