Cast iron with spheroidal graphite and austenitic-bainitic mixed structure

US4541878A · kind A · utility

Assignee

• Horst Muhlberger · DE

Inventors

• Horst Muhlberger · Frankfurt am Main, DE
• Bruno Prinz · Oberursel, DE
• Wolf Wunder
• Ulrich Schafer · Fellbach, DE
• Josef Bognar · St. Leon-Rot, DE

Key dates

• Filing date: Dec 16, 1983
• Grant date: Sep 17, 1985
• Expiry date: Dec 16, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A high ductility machinable cast iron with mixed austenitic-bainitic structure is made by a method which involves limiting the manganese content to less than 0.3% by weight and utilizing a substantially lower temperature austenitizing heat treatment (820.degree. to 830.degree. C.) for a shorter period (10 to 25 minutes) than has hitherto been considered to be necessary to achieve such structures. The low alloy cast iron can therefore be made from available scrap with low manganese content and at low cost.