ROLLED MATERIAL FOR FRACTURE SPLIT CONNECTING ROD EXCELLING IN FRACTURE SPLITTABILITY, HOT FORGED PART FOR FRACTURE SPLIT CONNECTING ROD EXCELLING IN FRACTURE SPLITTABILITY, AND FRACTURE SPLIT CONNECTING ROD
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United States of America Patent
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Issued Date -
Feb 19, 2009
app pub date -
Mar 13, 2007
filing date -
Mar 15, 2006
priority date (Note) -
Abandoned
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Abstract
The present invention provides a rolled material having excellent fracture splitting characteristics and suitable for the manufacture of a connecting rod in which a through-hole section for assembly in a crankshaft is fracture split in substantially semicircles. Prescribed components are contained, an average aspect ratio of a sulfide-based inclusion as observed in a D/4 portion (D is the diameter of the rolled material) in a cross-section parallel to a longitudinal direction of the rod-shaped rolled material is not more than 10.0, a Pc indicated in Equation (1) below is between 0.41 and 0.75, and a Veq indicated in Equation (2) below is not less than 0.18 mass %=C(1−α/100) (1){In Equation (1), C represents the carbon content in steel (mass %) and α represents the ferrite fraction (area ratio %)}=V+Ti/2+Si/20 (2){In Equation (2), V, Ti and Si represent the content of each element in steel (mass %)}.
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