EP 0203050 A1 19861126 - A method for manufacturing austempered spheroidal graphite iron.
Title (en)
A method for manufacturing austempered spheroidal graphite iron.
Title (de)
Verfahren zur Herstellung von einem zwischenstufengehärteten Kugelgraphit-Gusseisen.
Title (fr)
Procédé de fabrication d'une fonte à graphite spréroidal, trempée et bainitique.
Publication
Application
Priority
SE 8502514 A 19850522
Abstract (en)
A method for producing austempered spheroidal graphite iron having a microstructure comprising bainite, ferrite and austenite. A nodular-iron casting containing 2-3.5% Si, 0-2% Mn, 0-5% Ni 0-0.3% Sn, 0-03% Cr, 0-3% Mo, 0-1.5% Cu, and 3.3-3.8% C and at most 0.08% P and 0-015% S is partially austenitized by heat treatment at a temperature beneath the temperature at which austenite and graphite or austenite are in equilibrium, but within the temperature range in which ferrite, austenite and graphite are in equilibrium. The temperature of the casting is then rapidly lowered by at least 100 K min<-><1>, and is held at a constant temperature within a range of 235 and 425 DEG C, wherewith part of the austenite formed is converted to bainite to provide a casting that includes a bainite structure with a residual austenite content of 5-40%, preferably 15-20%, and a ferrite content of 10-15%, preferably 20-40%.
IPC 1-7
IPC 8 full level
C21D 5/00 (2006.01)
CPC (source: EP)
C21D 5/00 (2013.01)
Citation (search report)
- EP 0018445 A1 19801112 - MUEHLBERGER HORST [DE]
- EP 0144907 A2 19850619 - NISSAN MOTOR [JP]
Designated contracting state (EPC)
AT CH DE FR GB LI SE
DOCDB simple family (publication)
EP 0203050 A1 19861126; FI 862137 A0 19860521; FI 862137 A 19861123; PT 82629 A 19860601; PT 82629 B 19870928; SE 8502514 D0 19850522; SE 8502514 L 19861123
DOCDB simple family (application)
EP 86850178 A 19860520; FI 862137 A 19860521; PT 8262986 A 19860522; SE 8502514 A 19850522