Spheroidal Graphite Cast Iron Excellent in Gas Defect Resistance
AssigneeHitachi Metals, Ltd.
InventorsMasahide Kawabata, Hideya Yamane
Life of this patent
Estimating the term…
Abstract
There is provided with spheroidal graphite cast iron having excellent gas defect resistance where gas defects such as pinholes attributable to the free N are small in number and having mechanical characteristics and machinability equal to or greater than the conventional ones. The spheroidal graphite cast iron consists of, in mass ratio, C: 3.3 to 4%; Si: 2 to 3%; P: not more than 0.05%; S: not more than 0.02%; Mn: not more than 0.8%; Cu: not more than 0.8% (0 is not included); Mg: 0.02 to 0.06%; Ti: 0.01 to 0.04%; V: 0.001 to 0.01%; Nb: 0.001 to 0.01%; and N: 0.004 to 0.008%, with the remnant substantially consisting of Fe and an inevitable impurity.
Claims8
1-5. (canceled)
A spheroidal graphite cast iron excellent in gas defect resistance consisting of, in mass ratio:
- C:
- 3.3 to 4%;
- Si:
- 2 to 3%;
- P:
- not more than 0.05%;
- S:
- not more than 0.02%;
- Mn:
- not more than 0.8%;
- Cu:
- not more than 0.8% (0 is not included);
- Mg:
- 0.02 to 0.06%;
- Ti:
- 0.01 to 0.04%;
- V:
- 0.001 to 0.01%;
- Nb:
- 0.001 to 0.01%;
- and
- N:
- 0.004 to 0.008%,
- with the remnant substantially consisting of Fe and an inevitable impurity.
Dependencies are inferred from the claim text.