Patent · US Expired

Heat treatment method

US4285742A · kind A · utility

8Cited by
5References
10Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 29, 1979
Grant dateAug 25, 1981
Priority date—
Expiry dateNov 29, 1999

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC21D3/04
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

In order to decarburize ferrous metal without recourse to an exothermic generator, an inert gas (typically nitrogen), water and a liquid or vaporous compound of carbon, hydrogen and oxygen (typically methanol) are admitted to a working chamber of the heat treatment furnace in which the metal is situated. The decarburization is preferably performed at 700.degree. to 800.degree. C. The methanol and water react to form a non-oxidizing, decarburizing atmosphere at the decarburizing temperature. The metal may be oxidized at a temperature below 600.degree. C. in another chamber of the furnace, the atmosphere from the decarburizing chamber being passed into the oxidizing chamber.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.