QQ-S-763C QQ-S-763C dho (Mechanical) (OP) 20 Oct 15 16:58 what is the mechanical properties of 303 stainless steel listed under QQ-S-763C? thanks. RE: QQ-S-763C israelkk (Aerospace) 21 Oct 15 04:55 To my best knowledge QQ-S-763 doesn't list 303 which is a free cutting version of 302. 303 is covered by ASTM A 581. RE: QQ-S-763C dho (Mechanical) (OP) 21 Oct 15 11:20 303 was listed in qq-s-763 revision C and older. not in rev D and later. C is no longer available (free) at government site. RE: QQ-S-763C israelkk (Aerospace) 21 Oct 15 12:43 Yes you are correct. Here is a note I have found in QQ-S-763E. 6.4 Classes 303, 303Se, 416, 416Se, 430F and 430F Se under QQ-S-763C should be purchased to ASTM A 484 and ASTM A 582 or ASTM A 555 and 581.