EP 1384794 A1 20040128 - Spheroidal cast iron particulary for piston rings and method for its production

Title (en)

Spheroidal cast iron particulary for piston rings and method for its production

Title (de)

Kugelgraphitgusseisen für Kolbenringe und Verfahren zu seiner Herstellung

Title (fr)

Fonte nodulaire pour segments de piston et procédé pour la fabrication de ladite fonte

Publication

EP 1384794 A1 20040128 (EN)

Application

EP 03016555 A 20030724

Priority

IT MI20021670 A 20020726

Abstract (en)

A spheroidal cast iron, particularly for piston rings for pistons of engines, with a particular alloyed chemical composition and subjected to a heat treatment known as austempering, which comprises an austenitization treatment followed by an isothermal hardening treatment, has mechanical characteristics that are comparable with those of the steel currently used to produce piston rings, while maintening the best tribological and self-lubrification characteristics of spheroidal cast irons, and a process suitable to obtain said spheroidal cast iron.

IPC 1-7

C22C 37/04; C21D 5/00

IPC 8 full level

C21D 5/00 (2006.01); C22C 33/08 (2006.01); C22C 37/04 (2006.01); C22C 37/10 (2006.01); C21D 1/20 (2006.01)

CPC (source: EP US)

C21D 5/00 (2013.01 - EP US); C22C 33/08 (2013.01 - EP US); C22C 37/04 (2013.01 - EP US); C22C 37/10 (2013.01 - EP US); C21D 1/20 (2013.01 - EP US); C21D 2211/001 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/006 (2013.01 - EP US)

Citation (search report)

[XA] DE 4305027 A1 19930819 - COFAP [BR]
[A] EP 0018445 A1 19801112 - MUEHLBERGER HORST [DE]
[A] US 4838956 A 19890613 - SATOU KAZUO [JP], et al
[A] DE 3639658 A1 19880601 - MUEHLBERGER HORST DIPL PHYS DR [DE]
[A] PATENT ABSTRACTS OF JAPAN vol. 010, no. 036 (C - 328) 13 February 1986 (1986-02-13)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

DOCDB simple family (publication)

EP 1384794 A1 20040128; EP 1384794 B1 20060524; AT E327351 T1 20060615; DE 60305389 D1 20060629; DE 60305389 T2 20070503; ES 2264507 T3 20070101; IT MI20021670 A1 20040126; PT 1384794 E 20061031; US 2004071584 A1 20040415

DOCDB simple family (application)

EP 03016555 A 20030724; AT 03016555 T 20030724; DE 60305389 T 20030724; ES 03016555 T 20030724; IT MI20021670 A 20020726; PT 03016555 T 20030724; US 62587203 A 20030724