High-strength stainless steel for use as material of fuel inject

Details High-strength stainless steel for use as material of fuel inject High-strength stainless steel for use as material of fuel inject

1994-04-18

1996-02-20

Yee, Deborah

Metal treatment

Stock

Ferrous

148325, 148334, C22C 3822

Patent

active

054925738

ABSTRACT:
A high-strength stainless steel for use as a material of a fuel injection nozzle or a fuel injection needle of an internal combustion engine. The stainless steel is an as annealed martensitic stainless steel which exhibits a hardness not less than HRC 58 after quenching and tempering heat-treatment. The limit swaging ratio of said as annealed martensitic stainless steel is not less than 75%. The hardness of said as annealed martensitic stainless steel is not higher than HB 157. Preferably, the number of carbides having sizes of 0.2 .mu.m or less occupies not more than 50% of the total carbides, and wherein the limit swaging ratio of said as annealed martensitic stainless steel is not less than 75% or the hardness of said as annealed martensitic stainless steel is not higher than HB 157. Preferably, the stainless steel has a chemical composition containing, by weight: 0.4 to 0.6% of C; not more than 0.5% of Si; not more than 0.5% of Mn; 8.0 to 13.0% of Cr; 0.1 to 2.0% of one or both of W and Mo in terms of W/2+Mo; one or both of 0.05 to 1.0% of one or both of Nb and V in terms of Nb/2+V, and 0.2 to 2.0% of Co; and the balance substantially Fe and incidental impurities.

REFERENCES:
patent: 3044872 (1962-07-01), Hayes et al.
patent: 4634573 (1987-01-01), Yanagiya et al.
patent: 5279688 (1994-01-01), Isokawa et al.
patent: 5362337 (1994-11-01), Kosa
patent: 5370750 (1994-12-01), Novotry et al.

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