Soft magnetic stainless steel for cold forging

Details Soft magnetic stainless steel for cold forging Soft magnetic stainless steel for cold forging

1986-07-18

1987-12-22

Rutledge, L. Dewayne

Metal treatment

Stock

Magnetic

420 41, 420 70, 420103, C22C 3828

Patent

active

047145021

ABSTRACT:
A soft magnetic stainless steel consists essentially of, by weight, up to 0.03% of C, 0.40 to 1.10% of Si, up to 0.50% of Mn, 9.0 to 19.0% of Cr, 0.31 to 0.60% of Al, 0.01 to 0.03% of S, 0.10 to 0.30% of Pb, 0.02 to 0.25% of Ti, 0.02 to 0.10% of Zr, and up to 0.03% of N, and the balance of Fe and inevitable impurities, with a proviso that the C+N content is not more than 0.04% and the Si+Al content is not more than 1.35%. The steel has a magnetic flux density of 13,000 G or more and a coercive force of 1.2 Oe or less as magnetic properties, and a tensile strength of 41 kgf/mm.sup.2 or less and a critical compressibility of 50% or more as formability in cold forging. The steel is suitable for manufacturing, by cold forging, parts with complex shapes such as cores of solenoid operated valves and electromagnetic clutches, and bodies of electronic fuel injection apparatuses for internal combustion engines.

REFERENCES:
patent: 3165367 (1971-10-01), Tanczyn
patent: 4155752 (1979-05-01), Oppenheim et al.
patent: 4347080 (1982-08-01), Yanagida et al.
patent: 4465525 (1984-08-01), Yoshimura et al.

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