Patent ID: 6060172
Filing Date: 2000-05-09
Classification: C21D,C22C,Y10S,Y10T

Abstract:
An Fe-based rapidly quenched metal strip having a strip thickness exceeding 20 .mu.m and up to 70 .mu.m, wherein nonmetallic inclusions contained in said metal strip have a maximum particle size up to 50% of the strip thickness, and densities of the nonmetallic inclusions are up to 10 nonmetallic inclusions/mm.sup.3 for nonmetallic inclusions having a particle size exceeding 10 .mu.m and up to 50% of the strip thickness, up to 3.times.10.sup.3 nonmetallic inclusions/mm.sup.3 for nonmetallic inclusions having a particle size of at least 3 .mu.m to up to 10 .mu.m, and up to 5.times.10.sup.5 nonmetallic inclusions/mm.sup.3 for nonmetallic inclusions having a particle size of at least 0.3 .mu.m to less than 3 .mu.m, and showing the following average value <.epsilon..sub.f > of a bending fracture strain .epsilon..sub.f, being bent with the free surface of the strip placed outside:<.epsilon..sub.f >=0.8-1.0and the standard deviation .sigma. of the bending fracture strain .epsilon..sub.f is up to 50% of <.epsilon..sub.f >,wherein .epsilon..sub.f =t/(D-t), wherein t is the strip thickness (mm), and D is the bend diameter of the fractured strip (mm).