Patent · US Expired

High duty ductile case iron and its heat treatment method

US4099994A · kind A · utility

6Cited by
4References
3Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJul 11, 1977
Grant dateJul 11, 1978
Priority date—
Expiry dateJul 11, 1997

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC21D5/00
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

A ductile cast iron having a high tensile strength as well as a high elongation due to its matrix structure of finely mixed ferrite and pearlite grains obtained by the heat treatment. The material is pearlitic ductile cast iron and may be of ordinary ductile cast iron composition with the only exception that the manganese content being substantially less than 1%. A method of heat treatment for obtaining such a ductile cast iron, which is composed substantially of heating the material rapidly to form ferrite, austenite and graphite co-existing structure, and air cooling the same to change that structure into the above mentioned matrix structure.

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