Patent ID: 6638335
Filing Date: 2003-10-28
Classification: B22F,C22C

Abstract:
A highly compressible iron powder for powder metallurgy comprising, on the basis of mass percent of fractions after sieve classification using sieves defined in Japanese Industrial Standard (JIS) Z 8801-1:00 (Edition 2000):substantially 0% particles that do not pass through a sieve having a nominal opening of 1 mm; more than 0% to about 45% or less particles that pass through a sieve having a nominal opening of 1 mm and do not pass through a sieve having a nominal opening of 250 &mgr;m; about 30% and more to about 65% or less particles that pass through a sieve having a nominal opening of 250 &mgr;m and do not pass through a sieve having a nominal opening of 180 &mgr;m; about 4% and more to about 20% or less particles that pass through a sieve having a nominal opening of 180 &mgr;m and do not pass through a sieve having a nominal opening of 150 &mgr;m; and 0% and more to about 10% or less particles that pass through a sieve having a nominal opening of 150 &mgr;m, wherein the Vickers microhardness of the particles that do not pass through the sieve having the nominal opening of 150 &mgr;m is at most about 110.