| 摘要 |
A moderately high carbon alloy grey iron having a carbon content ranging from 3.4% to 3.6% by weight and a primary alloying addition of the combination of molybdenum and copper in amounts by weight ranging from 0.25% to 0.40% and from about 0.30% to 0.60%, respectively for achieving thermal fatigue resistance and good machinability without adversely affecting chill depth, and with a relatively low silicon content of about 1.80% to 2.10%. The alloyed grey iron having the characteristics of: (i) a microstructure of a fully pearlitic matrix having a refined eutectic cell size, and graphite present in substantially uniform distribution and random orientation, the graphite having a flake size of predominantly 5-7 ASTM; (ii) a tensile strength of at least 40,000 psi in the desired section size; (iii) a hardness of about 179 to about 229 Brinell.
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