A 106 GRADE B MAXIMUM TEMPERATURE.
A 106 GRADE B MAXIMUM TEMPERATURE.
(OP)
What is the maximum allowable temperature for use of ASTM A 106 Grade B. Can ASTM A 106 grad B material be used for superheated steam service at 420 degre celsius. Is there any limitations as per the code B31.1 for use at this temperature. If so can it be used for vent and drain lines.





RE: A 106 GRADE B MAXIMUM TEMPERATURE.
RE: A 106 GRADE B MAXIMUM TEMPERATURE.
For vents and drains, I recomend using a minimum of Sch. 160 nipples regardless of what wall thickness calculations show is acceptable. The robustness will help prevent the connections from breaking off if they become bumped during construction or operation. Your branch will be with a 6000# weld-o-let.
NozzleTwister
Houston, Texas
RE: A 106 GRADE B MAXIMUM TEMPERATURE.
Most Engineering specs that I see specify A-106 C for your design condition or choose P11/P12 low alloy steel.
RE: A 106 GRADE B MAXIMUM TEMPERATURE.
Also the use of P11/P12 , what is the maximum allowable continous operating temperature.
RE: A 106 GRADE B MAXIMUM TEMPERATURE.
RE: A 106 GRADE B MAXIMUM TEMPERATURE.
RE: A 106 GRADE B MAXIMUM TEMPERATURE.
ASTM A-106, Grade B, carbon steel should not be used at temperature above 800 degrees F (427 degrees C). See the notes in ASME B31.1 and B31.3, Appendices "A".
"Conversion of carbides to graphite may occur after prolonged exposure to temperatures over 427 degrees C (800 degrees F)."
This is referred to as "carbon migration". When you move the carbides out of the metal grains to within the grain boundaries the material become brittle (ductility is lost).
Regards, John.
RE: A 106 GRADE B MAXIMUM TEMPERATURE.
This often becomes an issue for designing power plant cold reheat piping- turbine trips or startup transients can cause the HP exhaust to overheat to 900 F.