Patent ID: 6168095
Filing Date: 2001-01-02
Classification: F02M,Y10S

Abstract:
A fuel injector for internal combustion engines, comprising a nozzle body (10) in which a valve needle (20) with a sealing face (22) is movably supported, said valve needle comes into contact with a valve seat face (12) that is formed on an inner wall region (31) of an end cup (30) of the nozzle body (10) and adapted to the valve needle, at least one injection opening (32) is provided in said valve seat face, wherein both the inner wall region (31) with the valve seat face (12) of the nozzle body (10) and an outer wall region are hardened, and the nozzle body (10) is comprised of a rustproof martensitic steel that is hardened by means of case hardening with nitrogen, and the rustproof martensitic steel comprises the following composition: from about 0.001 to about 0.10 weight % C; from about 0.03 to about 0.3 weight % N: from about 0.01 to about 1.0 weight % Si; from about 10.0 to about 20.0 weight % Cr; from about 1.0 to about 5.0 weight % Mo; from 0 to about 0.5 weight % Nb; from about 0.01 to about 0.5 weight % V, and alloy additives for a suppression of .delta.-ferrite.