I hope ammangz that you are talking about the material ASTM-B337. If it is so ,then it is listed in input spreadsheet material list under number 314 to 317 with Grade 1, Grade 2, Grade 3 and Grade 7. (Refer attached Snapshot 'Input Spreadsheet')
If your material is different, you can creat a new custom material using TOOLS --->MATERIAL DATABSE , and add the values of allowable from B31.3(Whichever applicable) or the parent library of ASME Sec II Part D.
Hope this solves the problem
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With Regards,
Stress_admirer