公开(公告)号：US3764381A

公开(公告)日：1973-10-09

申请号：US3764381D

申请日：1970-09-11

Applicant: LOIRE ATEL FORGES

Inventor： BRISSONNEAU P ,  COUDERCHON G

IPC: C21D1/04 ,  C21D8/12 ,  C22C38/02 ,  C23C10/00 ,  H01F1/18 ,  H01F7/02

CPC classification number: H01F1/18 ,  C21D1/04 ,  C21D8/1255 ,  C22C38/02 ,  C23C10/00

Abstract: EACH FACE OF A SHEET OR STRIP OF MAGNETIC STEEL IS COATED WITH A THIN LAYER OF AT LEAST ONE ELEMENT OF ALUMINUM, SILICON, COBALT AND GERMANIUM, WHICH ELEMENT IS DIFFUSED INTO THE SHEET UNTIL THE ELEMENT IS DISTRIBUTED THEREIN IN A CONCENTRATION DECREASING FROM THE FACES TO THE CORE OF THE SHEET, AND THE RESULTING PRODUCT IS SUBMITTED TO HEAT TREATMENT UNDER THE INFLUENCE OF A MAGNETIC FIELD.