Aichi Steel Works, Ltd.

Takashi Yokoyama

Yoshinobu Honkura

Kouji Murata

Hideki Fujii

Yoshinobu Tanaka

Dental attachment

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.

Soft magnetic stainless steel for cold forging

A soft magnetic stainless steel consisting essentially of, by weight, up to 0.03% of C, 2.0 to 3.0% of Si, up to 0.40% of Mn, 0.015 to 0.050% of S, 10 to 13% of Cr, 0.05 to 0.20% of Ti, up to 0.03% of N, up to 0.010% of Al, and the balance of Fe and inevitable impurities, with a proviso that the C+N content is not more than 0.05%. The steel has a maximum permeability of not less than 4400 and a magnetic flux density of not less than 12,000 G as magnetic properties, together with a fatigue strength after welding of not lower than 120 kgf cm.sup.2, retains the magnetic properties even after annealing at a high temperature of 920.degree. C., and is excellent in electrical resistance, corrosion resistance, mechanical properties and machinability.

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Tokai, Japan

Takashi Yokoyama