公开(公告)号：EP0746635A4

公开(公告)日：1995-07-19

申请号：EP93918320

申请日：1993-07-23

申请人： DETROIT DIESEL CORP

发明人： BEGIN ROGER E

IPC分类号： C22C37/10

CPC分类号： C22C37/10

摘要： A moderately high carbon alloy grey iron having a carbon content ranging from 3.4 % to 3.6 % by weight and 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.