Ss Pipe 347

Ss Pipe 347

These types of stainless are austenitic chromium steels containing colubium. They are recommended for parts fabricated by welding which cannot be subsequently annealed. These types also are used for parts which are intermittently heated and cooled to temperatures between 800A F and 1600A F. The addition of columbium produces a stabilied type of stainless that eliminates carbide precipitation and, consequently, intergranular corrosion.

Availability - Stainless Steel 347/347H
Seamless Pipe 1/2" - 12"

Weld Pipe 8" - 12"

Butt-Weld Flanges 1/2" - 8"



Specifications - Stainless Steel 347/347H
ASTM
A312, A403

ASME
SA312, SA403





Chemical Composition - 347/347H
CCoCrMnNiPSSiTa
Max Max MaxMaxMax
0.08%Trace*17% - 20%2.0%9% - 13%0.04%0.03%0.75%Trace*


*The columbium plus tantalum content shall not be less than 10 times the carbon content and not more than 1.0%. 347H requires the columbium plus tantalum content to be not less than 8 times the carbon content and not more than 1.0%.

Design Features - Stainless Steel 347/347H
Superior general corrosion resistance over Type 321 due to stabilization with columbium.
Reduced tendencies to form continuous networks of chromium carbides at the grain boundaries.
Better high temperature properties than 304 or 304L. Generally used for parts which are intermittently heated up to 1500A F. For continuous service the maximum temperature is 1650A F.