ASME B31.3 table 304.1.1 Low Alloy Steel

[Metma]

dear all,
with reference to ASME B31.3 Table 304.1.1 Values of Coefficient Y Low Alloy Material Like A335-P11 or A691 1.25Cr or A234-WP11 which is the group to take as reference for thickness calculation ? "Ferritic Steel" or "Other ductile metals" ?
thank for your supports
regards

 

[MJCronin]

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MJCronin
Sr. Process Engineer