6 u00b0 c from 75 u00b0 f 24 u00b0 c to indicated temperature cold rolled 50 annealed 200 u00b0 f 300 u00b0 f 500 u00b0 f 700 u00b0 f 200 u00b0 f 300 u00b0 f 500 u00b0 f 700 u00b0 fex no 93 u00b0 c 150 u00b0 c 260 u00b0 c 370 u00b0 c 93 u00b0 c 150 u00b0 c 260 u00b0 c 370 u00b0 c __________________________________________________________________________1 14 18 14 77 16 26 17 29 15 94 16 35 17 47 18 25 25 52 26 59 29 27 31 12 28 69 29 43 31 45 32 85 2 14 13 14 51 15 72 16 62 15 18 15 85 17 00 17 80 25 43 26 12 28 30 29 92 27 32 28 53 30 60 32 04 3 13 94 14 54 15 79 16 75 14 08 15 04 16 43 17 36 25 09 26 17 28 42 30 15 25 34 27 07 29 57 31 25 5 4 28 15 36 15 92 16 39 14 07 15 15 15 84 16 39 25 70 27 65 28 66 29 50 25 33 27 27 28 51 29 50 __________________________________________________________________________ for comparison alloys a and b were prepared representative of prior art compositions corresponding in the case of alloy a to examples 1 3 but containing only 0 018 nitrogen and in the case of alloy b corresponding to example 5 but containing only 0 019 nitrogen more specifically the composition of alloys a and b is given in table iii except for incidental impurities which were essentially as previously described in connection with examples 1 5.