QQ-S-766 IS THE FEDERAL SPECIFICATION FOR STEEL, STAINLESS AND HEAT RESISTING, ALLOYS, PLATE, SHEET AND STRIP
QQ-S-766D, FEDERAL SPECIFICATION: STEEL, STAINLESS AND HEAT RESISTING, ALLOYS, PLATE, SHEET AND STRIP (30 JUL 1993) [S/S BY ASTM-A240, ASTM-A666, AND ASTM-A693]
All of the grades covered under QQ-S-766 are 300 and 400 series Stainless Steels
Depending on the call out of your engineering drawing, you will have to select one of the grades displayed below
For a copy of QQ-S-766 follow this link to Everyspec and download to confirm which grade is required for your project
Disclaimer:
While your project may call out this specification it is important to check with engineering to specify which grade you are looking for before proceeding with a project.
See below grades that fall under AMS-QQ-S-766