Hardenability of L-80 13 Cr material as per API 5CT

[gafoorkti]

Please can somebody tell me about hardenability requirement as per API 5CT for Coupling 3-1/2" L-80 13Cr material.

We have received hardness report after tempering, but hardenabilty hardness values for as quenched condition are not mentioned in MTC. As per my interpretation with code, hardenabilty test to be carried out.(Reference API 5CT, clause 7.10.2)
We have raised discrepancy about this and conveyed to manufactuer.
But manufacturer clarifies that hardeneability requirement is not mandatory.

 

[blacksmith37]

The hardenability requirement as originally written and up to at least the 1995 ed. of 5CT, is required only for C-90 and T-95, not L-80 13Cr (or 9Cr). C90 and T95 are intended for sour service and the high martensite requirement improves SSC resistance. The 13Cr has very deep hardenability and would comply although it is not required.