Magnesium-treated, decarburizingly-annealed cast iron material

Details Magnesium-treated, decarburizingly-annealed cast iron material Magnesium-treated, decarburizingly-annealed cast iron material

1987-09-09

1990-02-13

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148138, 148321, 148901, C22C 3704, C21D 500

Patent

active

049003755

ABSTRACT:
A magnesium-treated, decarburizingly-annealed cast iron material includes 4% or less carbon by weight, 2% or less silicon by weight, at least 0.010% magnesium by weight, and at least 0.001% sulphur by weight, the remainder being iron. The cast iron material is subjected to a first annealing phase in which graphitic carbon portions are formed. Thereafter, the cast iron material undergoes a second annealing phase during which certain of the graphitic carbon portions are burned out. The resultant structure includes cavities in place of certain of the graphitic carbon portions in a substantially ferritic matrix. The resultant cast iron material exhibits good welding and cutting properties with little susceptibility to hard cracking.

REFERENCES:
patent: 2763583 (1956-09-01), Kawasaki
patent: 3155498 (1964-11-01), Jandras
patent: 4040875 (1977-08-01), Noble
patent: 4096002 (1978-06-01), Ikawa
patent: 4173500 (1979-11-01), Kawaguchi
"Richtreihen Zur Kennzeichnung Der Graphitausbildung", VDG Merkblatt, p. 441, Aug. 1962.

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