ISO 3506-1 fasteners and ASME B31.3

[HJS7]

Good afternoon,

For piping with design code ASME B31.3 we usually use fasteners A2 or A4 according ISO 3506-1.
Unfortunately I cannot find the A2 and A4 steel grades in Tabel A-1M of the ASME B31.1.

Is there any link or interpretation about using materials A2 and A4 according ISO 3506-1 within the ASME B31.3 design code?

Thank you,

HJS