EP 0371840 B1 19930818 - FREE CUTTING MILD STEEL AND PROCESS FOR MANUFACTURING SAME
Title (en)
FREE CUTTING MILD STEEL AND PROCESS FOR MANUFACTURING SAME
Publication
Application
Priority
FR 8816093 A 19881201
Abstract (en)
[origin: US4978499A] A soft steel for machine cutting with high machinability performances having a content of C</=0.25%, a content of Mn of 0.8 to 1.5%, a content of P of </=0.1%, a content of S of 0.15 to 0.40%, and a content of Si of 0.05 to 0.40%, expressed in percentages by weight. After finishing of the metal, the inclusions of manganese sulfide are surrounded by a plastic oxide layer of an average composition SiO2: 35 to 45%; Al2O3: 10 to 20%; CaO: 15 to 25%; MnO: 10 to 20%. In producing this grade, after the addition of silicon and manganese, the liquid metal is agitated in the presence of a slag of a composition CaO: 20 to 55%; SiO2: 35 to 65%; Al2O3: 15 to 40%; with a CaO %/SiO2% ratio of about 1.
IPC 1-7
IPC 8 full level
C22C 33/04 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR US)
C22C 38/04 (2013.01 - KR); C22C 38/60 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0371840 A1 19900606; EP 0371840 B1 19930818; AT E93278 T1 19930915; CA 2004294 A1 19900601; CA 2004294 C 19960430; DE 68908535 D1 19930923; DE 68908535 T2 19940120; ES 2044186 T3 19940101; FR 2639960 A1 19900608; FR 2639960 B1 19930723; JP H02213446 A 19900824; JP H068481 B2 19940202; KR 900010038 A 19900706; KR 930010326 B1 19931016; US 4978499 A 19901218
DOCDB simple family (application)
EP 89403078 A 19891108; AT 89403078 T 19891108; CA 2004294 A 19891130; DE 68908535 T 19891108; ES 89403078 T 19891108; FR 8816093 A 19881201; JP 31306489 A 19891201; KR 890017433 A 19891129; US 44425989 A 19891201