role of Mn in sour service
role of Mn in sour service
(OP)
in one of the project requirement customer has given a specific chemical requirement for A333 Gr 6 pipe such as C< 0.21;Mn<1.1;S< 0.01;CE< 0.41.
Now we have submitted a TC in which only Mn is 1.29 other elements were well below requirement.specially S was 0.006 & i geuss S element is most imp in sour application.
Customer now not accepting the deviation in Mn & they say that it is not acceptable in sour service.
I want to know the impact of Mn in sour service?
as per my perception S is the only contributing factor in sour service.
Now we have submitted a TC in which only Mn is 1.29 other elements were well below requirement.specially S was 0.006 & i geuss S element is most imp in sour application.
Customer now not accepting the deviation in Mn & they say that it is not acceptable in sour service.
I want to know the impact of Mn in sour service?
as per my perception S is the only contributing factor in sour service.





RE: role of Mn in sour service
RE: role of Mn in sour service
I guess such low CE is acceptable to sour.
RE: role of Mn in sour service
RE: role of Mn in sour service
If this is the case, I don't see how the additional Mn is going to affect performance in service. You still have the customer's specification requirements, and if I were you I would try to convince the customer that the slightly higher mass % content of Mn will not affect performance based on calculated CE values for comparison.
It will still be up to the customer to decide - that is business.
RE: role of Mn in sour service
RE: role of Mn in sour service
Did you not provide the Customer's requirements with the P.O.? Why have you accepted pipe not meeting those requirements?
It is noted that higher %Mn is normally required to meet the -50 F impact toughness for A333 Gr6 depending on thickness.
The critical factor is whether this material will meet the hardness requirements in the HAZ and any cracking testing requirements, which it can.
RE: role of Mn in sour service
we will be carring PWHT for all the weld joint to control the hardness.
Will this help us stanweld?
RE: role of Mn in sour service