# US 10,767,238 B2 · Gray cast iron inoculant

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- Number: US 10,767,238 B2
- Document ID: US10767238B2
- Status: Granted
- Kind: B2
- Application number: 15/099,897
- Filed: 2016-04-15
- Published: 2017-10-19
- Granted: 2020-09-08
- Earliest claimed: 2016-04-15
- Assignees: Elkem ASA
- Applicants: Elkem AS
- Inventors: Matthew Liptak
- Web page: https://patentgrep.com/patent/US10767238B2

## CPC

- C21C 1/08: Manufacture of cast-iron
- C22C 33/08: Making cast-iron alloys
- C22C 37/10: containing aluminium or silicon
- C21C: PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A ferrosilicon inoculant for gray cast iron containing between 0.1 to 10% by weight strontium, less than 0.35% by weight calcium, 1.5 to 10% by weight aluminum and 0.1 to 15% zirconium, The inoculant, method for producing the inoculant, method for inoculating the melt and a gray cast iron inoculated with the inoculant are covered.

## Claims

### Claim 1

A ferrosilicon inoculant for cast iron consisting of
about 15 to 90% by weight silicon;
about 0.1 to 10% by weight strontium;
less than about 0.35% by weight calcium;
about 1.5 to 10.0% by weight aluminum;
about 0.1 to 15% by weight zirconium, and
a balance of iron with residual impurities.

### Claim 2 (depends on 1)

The ferrosilicon inoculant according to claim 1, wherein the silicon is present in an amount of about 40 to 80% by weight.

### Claim 3 (depends on 1)

The ferrosilicon inoculant according to claim 1, wherein the aluminum is present in about 2-6% by weight.

### Claim 4 (depends on 1)

The ferrosilicon inoculant according to claim 1, wherein the aluminum is present in about 2-4% by weight.