hi to all,
Thank you for replying,
I notice in CII material list, for ASME 31.3

(373) A691 1CR
(374) A691 5CR
(375) A691 9CR
(376) A691 3CR
(379) A691 1.25CR

Which pipe material I need to select from CII material list for A691 CL21.

Check the composition of material(Cr content,Mo content etc etc) as per your project Pipe Class & choose accordingly.Say, your mat composition is 1Cr-0.5Mo. So go with A691 1Cr.

Your right, actually I got the right material in CII, I reviewed my material spec incorrect.
I got corrrected now.

Thanks for posting your reply.

My material spec was.
A691 CL21 1.25CR.