Best Ref For Substituting 9018-B3H4R Rods For 9018-B3L
Best Ref For Substituting 9018-B3H4R Rods For 9018-B3L
(OP)
What is the best reference to quote (for checking) to allow substituing 9018-B3H4R for 9018-B3L rods?
My sub-contractor wants to begin using his 9018-B3H4R rods when he runs out of his current lot of 9018-B3L rods. We are re-facing steam valve seating surfaces in the machine shop.
My sub-contractor wants to begin using his 9018-B3H4R rods when he runs out of his current lot of 9018-B3L rods. We are re-facing steam valve seating surfaces in the machine shop.





RE: Best Ref For Substituting 9018-B3H4R Rods For 9018-B3L
The suffix for H4 refers to low hydrogen electrodes. This number refers to a maximum diffusible hydrogen content in the electrode from manufacture.
Read AWS SFA 5.5 specification.
RE: Best Ref For Substituting 9018-B3H4R Rods For 9018-B3L
Heat treatment (for this valve) is substituted by a 2 hour 600 degree H2 baking after baking. Base metal temp during welding is 450 F.
Again, thank you for the quick reply!
Robert
RE: Best Ref For Substituting 9018-B3H4R Rods For 9018-B3L
Regarding your substitution, the B3 versus the B3L will have higher elevated temperature strength because of the higher carbon content in B3 versus B3L. So, this substitution would br what you need to use for elevated temperature service of 2.25%Cr-1%Mo steel.
RE: Best Ref For Substituting 9018-B3H4R Rods For 9018-B3L