INOCULANT PELLET FOR LATE INOCULATION OF CAST IRON

• US 20030126947A1
• Filed: 01/10/2002
• Published: 07/10/2003
• Est. Priority Date: 01/10/2002
• Status: Active Grant

• Current Assignee: Pechiney Electrometallurgie
• Original Assignee: Pechiney Electrometallurgie
• Inventors: Margaria, Thomas J.
• Granted Patent: US 6,613,119 B2
• Time in Patent Office: Days
• US Class Current: 75/306
• CPC Class Codes: B22D 1/007 Treatment of the fused masses in the supply runners B22D1/002, B22D1/005 take precedence
• CPC Class Codes: C21C 1/105 Nodularising additive agents

Abstract

A pellet, intended for the late inoculation of cast irons, obtained by agglomeration of a powdered inoculant, characterised in that the mass proportion of the granulometric fraction 50-250 microns of the powdered inoculant of which the pellet is constituted is comprised between 35 and 60%, and the mass proportion of the granulometric fraction below 50 microns is lower than 25%.

Claims

1. A pellet, intended for the late inoculation of cast irons, obtained by agglomeration of a powdered inoculant, characterised in that the mass proportion of the granulometric fraction 50-250 microns of the powdered inoculant of which the pellet is constituted is comprised between 35 and 60%, and the mass proportion of the granulometric fraction below 50 microns is lower than 25%.

2. A pellet according to claim 1, characterised in that the powdered inoculant has a particle size lower than 1 mm.

3. A pellet according to one of claim 2, characterised in that the mass proportion of the granulometric fraction 50-250 microns of the powdered inoculant of which the pellet is constituted is comprised between 40 and 50%, and the mass proportion of the granulometric fraction below 50 microns is lower than 20%.

4. A pellet according to claim 3, characterised in that the powdered inoculant used for the preparation of the pellet is a blend of two or more inoculant powder alloys.

5. A pellet according to claim 3, characterised in that the powdered inoculant used for the preparation of the pellet is a blend of two or more products constituting a heterogeneous inoculant.

6. A pellet according to claim 2, characterised in that the powdered inoculant used for the preparation of the pellet is a blend of two or more inoculant powder alloys.

7. A pellet according to claim 2, characterised in that the powdered inoculant used for the preparation of the pellet is a blend of two or more products constituting a heterogeneous inoculant.

8. A pellet according claim 1, characterised in that the mass proportion of the granulometric fraction 50-250 microns of the powdered inoculant of which the pellet is constituted is comprised between 40 and 50%, and the mass proportion of the granulometric fraction below 50 microns is lower than 20%.

9. A pellet according to claim 1, characterised in that the powdered inoculant used for the preparation of the pellet is a blend of two or more inoculant powder alloys.

10. A pellet according to claim 1, characterised in that the powdered inoculant used for the preparation of the pellet is a blend of two or more products constituting a heterogeneous inoculant.