the present invention relates to a superior fe -- cr alloy and a nozzle for diesel engines formed from this fe -- cr alloy . the fe -- cr alloy of the present invention comprises : ______________________________________ c : 0 . 1 ˜ 0 . 2 % by weight si : 0 . 1 ˜ 2 % by weightmn : 0 . 1 ˜ 2 % by weight cr : 16 ˜ 20 % by weightmo : 1 . 1 ˜ 2 . 4 % by weight nb : 0 . 3 ˜ 2 . 1 % by weightta : 0 . 1 ˜ 2 . 2 % by weight n : 0 . 02 ˜ 0 . 15 % by weight______________________________________ with a remaining portion therein consisting of fe and unavoidable impurities . it is possible to substitute a portion of the fe using 0 . 2 ˜ 2 . 5 % by weight of co . furthermore , in this case , it is also possible to substitute a portion of the fe using at least one element selected from among 0 . 2 ˜ 2 . 5 % by weight of ni and 0 . 2 ˜ 2 . 5 % by weight of w .