The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 2018
Filed:
Dec. 28, 2012
Applicant:
Hitachi Metals, Ltd., Minato-ku, Tokyo, JP;
Inventors:
Assignee:
HITACHI METALS, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C 37/04 (2006.01); C21D 5/00 (2006.01); C22C 33/10 (2006.01); C22C 33/08 (2006.01); C22C 37/10 (2006.01);
U.S. Cl.
CPC ...
C22C 37/04 (2013.01); C21D 5/00 (2013.01); C22C 33/08 (2013.01); C22C 33/10 (2013.01); C22C 37/10 (2013.01); C21D 2211/005 (2013.01); C21D 2211/006 (2013.01); C21D 2211/009 (2013.01);
Abstract
A spheroidal graphite cast iron having (a) a composition comprising by mass 3.4-4% of C, 1.9-2.8% of Si, 0.02-0.06% of Mg, 0.2-1% of Mn, 0.2-2% of Cu, 0-0.1% of Sn, 0.85-3% of (Mn+Cu+10×Sn), 0.05% or less of P, and 0.02% or less of S, the balance being Fe and inevitable impurities, and (b) a duplex matrix structure comprising by area 2-40% of fine ferrite phases and 60-98% of fine pearlite phases, the maximum length of the ferrite phases being 300 μm or less, and (c) the pearlite phases being formed around graphite particles dispersed in the duplex matrix structure.