Patent ID: 11969783
Assignee: MAGNA INTERNATIONAL INC.
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C  Y | IPC B

Claim 6:
7. The shot sleeve of claim 4, wherein the at least one middle layer includes a first middle layer, a second middle layer, a third middle layer, and a fourth middle layer; the first middle layer is located between the inner layer and the second middle layer; the first middle layer includes the steel and the alloy of chromium, iron, and molybdenum; the second middle layer is located between the first middle layer and the third middle layer; the second middle layer includes the alloy of chromium, iron, and molybdenum in an amount greater than an amount of the first layer; the third middle layer is located between the second middle layer and the fourth middle layer; the third middle layer includes the steel, the alloy of chromium, iron, and molybdenum, and the zirconium oxide; the fourth middle layer is located between the third middle layer and the inner layer; the fourth middle layer includes the steel, the alloy of chromium, iron, and molybdenum, and the zirconium oxide in an amount greater than an amount of the third middle layer.