EP 0462779 A2 19911227 - Method of making steel useful in springs.
Title (en)
Method of making steel useful in springs.
Title (de)
Wärmebehandlungsverfahren für Stahl, insbesondere von Stahl für Federn.
Title (fr)
Procédé de traitement thermique d'acier, notamment d'acier pour ressorts.
Publication
Application
Priority
- JP 2507691 A 19910128
- JP 2507791 A 19910128
- JP 15879090 A 19900619
Abstract (en)
Steel material containing by weight from 0.4 % to 0.8 % carbon, from 0.5 % to 2.5 % silicon, from 0.3 % to 2.0 % manganese, from 0.1 % to 1.5 % chromium, and from 0.1 % to 0.5 % molybdenum is hot-rolled to form a strip or plate. The hot-rolled plate or strip is annealed and cold-rolled at a rolling reduction between 10 % and 80 %. The cold-rolled strip or plate is heated at a temperature above Ac3 critical point for a time sufficient to austenitize carbide and annealed. Steel springs with attractive properties for use in motor vehicle clutches can be produced from this steel material.
IPC 1-7
IPC 8 full level
C21D 6/02 (2006.01); C21D 8/02 (2006.01); C21D 9/02 (2006.01)
CPC (source: EP KR)
C21D 6/02 (2013.01 - EP); C21D 8/0273 (2013.01 - EP); C21D 9/02 (2013.01 - EP); C22C 38/02 (2013.01 - KR); C22C 38/04 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C22C 38/24 (2013.01 - EP); C22C 38/26 (2013.01 - EP); C22C 38/34 (2013.01 - EP); C21D 8/0226 (2013.01 - EP); C21D 8/0236 (2013.01 - EP); C21D 8/0263 (2013.01 - EP)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0462779 A2 19911227; EP 0462779 A3 19930901; EP 0462779 B1 19960911; AU 633737 B2 19930204; AU 7837391 A 19920109; CA 2044639 A1 19911220; CA 2044639 C 20010828; DE 69121982 D1 19961017; DE 69121982 T2 19970130; KR 920000959 A 19920129; KR 930012177 B1 19931224
DOCDB simple family (application)
EP 91305456 A 19910617; AU 7837391 A 19910613; CA 2044639 A 19910614; DE 69121982 T 19910617; KR 910010243 A 19910619