High tensile strength gray iron alloy

Details High tensile strength gray iron alloy High tensile strength gray iron alloy

2007-01-16

2007-01-16

Wyszomierski, George (Department: 1742)

Metal treatment

Stock

Ferrous

C420S026000, C420S027000

Reexamination Certificate

active

10685097

ABSTRACT:
A gray iron alloy having a composition comprising about 4.10% to about 4.25% carbon equivalent, about 3.5% to about 3.65% carbon, about 0.4% to about 0.9% manganese, about 1.5% to about 1.9% silicon, less than about 0.12% phosphorous, less than about 0.17% sulfur, about 0.6% to about 0.8% molybdenum and about 0.3% to about 0.6% copper, and where said carbon is predominantly present as free carbon having a Type A flake graphite microstructure. The alloy is particularly useful in the manufacture of brake drums and other articles requiring a combination of high tensile strength and good thermal conductivity.

REFERENCES:
patent: 4948437 (1990-08-01), Metzler
patent: 5032194 (1991-07-01), Metzler
patent: 5894010 (1999-04-01), Porkert et al.
patent: 5948353 (1999-09-01), Lawrence et al.
patent: 5980651 (1999-11-01), de Azevedo et al.
patent: 6161661 (2000-12-01), Pahle et al.

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