Low white cast iron grinding slug

US5034069A · kind A · utility

Assignee

• Norcast Corporation · CA

Inventors

• Jean C. Farge · Montréal, CA
• Michel Lefebvre · Rouen, FR
• Robert Fortin · Mont-Joli, CA

Key dates

• Filing date: Jan 8, 1990
• Grant date: Jul 23, 1991
• Expiry date: Jan 8, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D5/04
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for producing a low alloy white cast iron is disclosed. The process comprises the steps of selecting one of a group of four alloying elements for a nickel, molybdenum/copper or modified low alloy iron; the four alloying groups consisting essentially, by weight percent of about: PA1 Group 1: 2.5 to 4.0% carbon; 0.3 to 0.8% silicon; 0.3 to 0.8% manganese; 0.75 to 2.0% nickel; 0 to 0.75% chromium. PA1 Group 2: 3.0 to 4.5% carbon; 0.3 to 0.8% silicon; 0.3 to 1.0% manganese; 0 to 0.8% molybdenum; and 0.3 to 1.0% copper. PA1 Group 3: 3.0 to 4.5% carbon; 0.3 to 0.8% silicon; 0.3 to 1.0% manganese; and 0.3 to 0.8% copper; the balance being iron except for incidental impurities commonly found in cast irons; melting the alloy; casting such alloy into moulds to produce the desired product; removing the product from the moulds while its surface temperature is above the transformation temperature of the alloy; and cooling it by quenching into a liquid medium containing water and an organic polymer at a sufficiently high rate to prevent the formation of pearlite but not so high as to generate cracks in the product.