347 Stainless Steel

Type 347 stainless steel immune to high temperatures, high strength, stabilized by Columbium and Tantalum. Uses include exhaust manifolds, flash boilers, stack liners, firewalls, pressure vessels and boiler casings.

Products Offered

  • Wire Cloth
  • Perforated Metal
  • Expanded Metal
  • Bar Grating
  • Hex Metal

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).


Carbon0.08 max
Chromium17 - 19
Manganese2 max
Nickel9 - 13
NiobiumMin:5 x C
Phosphorus0.045 max
Silicon1 max
Sulphur0.03 max

Physical Data

Density (lb / cu. in.)0.29
Specific Gravity8.03
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 Tension28


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In no event shall MSS be liable for any special, incidental, indirect or consequential damages of any kind or any damages whatsoever resulting from loss of use, data, profits, whether or not advised of the possibility of damage, and on any theory of liability, arising out of or in connection with the use of the information contained herein.

This publication may include technical inaccuracies or typographical errors. Changes may be periodically made to the information herein.