347 Stainless Steel

Stainless Steel Grade 347

347

Stainless Steel 347 is similar to the 321 stainless steels in that it is often used as a stabilized alternative to Type 304. In the case of 347, however, the stabilizing agent is columbium. This metal intensifies 347’s already present ability to withstand intergranular corrosion for maximum capabilities. Additionally, the columbium allows for 347 to undergo repeated heating in temperatures up to 1650° F. As a result, the metal is commonly applied to high temperature equipment, such as gaskets and expansion joints, along with rocket engine and chemical manufacturing.
In addition to its heat resistance properties, 347 also enjoys better resistance against creep and stress rupture corrosions. This is another advantage of type 304, as 347’s characteristics may be better suited for environments where stabilization is a primary concern.

Applications

  • Automotive industry 
  • General Engineering
  • Pharmaceuticals
  • Sugar Industry  
  • Food Grade Infrastuctres


ind1
ind2

 

Checklist on Selecting SS 347


Chemical Composition

Element
347
Ni
17.0 – 20.0
C
0.08 max
Mn
2.0 max
P
0.045 max
S
0.030 max
Si
1.0 max
Cr
17.0 – 19.0
Nb
10xC – 1.10