# US 4,394,161 A · Method of producing a vanadium- and nitrogen-containing material for use as an addition to steel

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,394,161 A
- Document ID: US4394161A
- Status: Granted
- Kind: A
- Application number: 06/393,228
- Filed: 1982-06-28
- Granted: 1983-07-19
- Earliest claimed: 1982-06-28
- Assignees: Union Carbide Corporation
- Inventors: Roy R. Hannum
- Web page: https://patentgrep.com/patent/US4394161A

## CPC

- C21C 7/0006: {Adding metallic additives}
- C01B 21/0617: {with vanadium, niobium or tantalum}
- C21C: PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}

## Abstract

A method for producing a vanadium- and nitrogen-containing material (V.sub.2 N) in which nitrogen gas is introduced into a furnace containing a mixture of V.sub.2 O.sub.3 and carbon in stoichiometric proportion while simultaneously maintaining the temperature in the furnace in a range of from about 1000.degree. C. to 1500.degree. C. under a reduced pressure in the range of from about 5 mm to 100 microns.

## Claims

### Claim 1

A method for making a material containing vanadium and nitrogen substantially in the form of V.sub.2 N, said method comprising:
(i) providing a mixture of V.sub.2 O.sub.3 and carbon in substantially stoichiometric proportions in accordance with the following formula:
V.sub.2 O.sub.3 +3C.fwdarw.2V+3CO
(ii) subjecting the mixture in a furnace to a temperature in the range of about 1000.degree. C. to 1500.degree. C. under a reduced pressure in the range of about 5 mm to 100 microns to cause reaction between mixture constituents and the evolution of CO;
(iii) continuously maintaining the temperature and pressure in the furnace in the respective ranges specified in (ii) while simultaneously and continuously introducing nitrogen gas into the furnace to provide a nitrogen atmosphere in the furnace until CO is essentially no longer evolved from the mixture; and
(iv) subsequently cooling the mixture in a nonoxidizing environment.