US2024167126A1PendingUtilityA1
Spheroidal Graphite Cast Iron, Method for Manufacturing Spheroidal Graphite Cast Iron, and Spheroidizing Treatment Agent
Est. expiryMar 24, 2041(~14.6 yrs left)· nominal 20-yr term from priority
C22C 37/04C22C 33/08C22C 37/10C21C 1/10C22C 33/10
61
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Claims
Abstract
A spheroidal graphite cast iron comprising, in mass percentage:2.8% or more and 3.3% or less of carbon;2.5% or more and 4.0% or less of silicon;0.32% or more and 0.40% or less of manganese;0.020% or more and 0.030% or less of phosphorus;0.020% or more and 0.035% or less of sulfur;0.030% or more and 0.050% or less of magnesium;0.010% or more and 0.050% or less in total of lanthanum and cerium; and0.0020% or more and 0.0050% or less of calcium, with the balance being iron and inevitable impurities.
Claims
exact text as granted — not AI-modified1 . A spheroidal graphite cast iron comprising, in mass percentage:
2.8% or more and 3.3% or less of carbon; 2.5% or more and 4.0% or less of silicon; 0.32% or more and 0.40% or less of manganese; 0.020% or more and 0.030% or less of phosphorus; 0.020% or more and 0.035% or less of sulfur; 0.030% or more and 0.050% or less of magnesium; 0.010% or more and 0.050% or less in total of lanthanum and cerium; and 0.0020% or more and 0.0050% or less of calcium, with the balance being iron and inevitable impurities.
2 . The spheroidal graphite cast iron according to claim 1 , wherein, when contents of magnesium, lanthanum, cerium, and calcium expressed in mass percentage are Mg, La, Ce, and Ca, respectively, a desulfurization capacity factor DS expressed by the following equation is 0.055% or more and 0.085% or less
[
Equation
1
]
DS
=
Mg
0.76
+
(
La
+
Ce
)
2.93
+
Ca
1.25
.
3 . The spheroidal graphite cast iron according to claim 1 , wherein, when a sulfur content expressed in mass percentage is S, an excess magnesium content RM expressed by the following equation is 0.015% or more and 0.045% or less
[
Equation
2
]
RM
=
Mg
-
[
S
-
{
(
La
+
Ce
)
2.93
+
Ca
1.25
}
]
×
0.76
.
4 . The spheroidal graphite cast iron according to claim 1 , further comprising, in mass percentage, 0.0020% or more and 0.0050% or less of aluminum.
5 . A method for manufacturing a spheroidal graphite cast iron, which comprises the processes of:
preparing a molten metal by melting raw materials; adding a spheroidizing treatment agent to the molten metal; and performing casting by pouring the molten metal to which the spheroidizing treatment agent is added, into a mold to produce spheroidal graphite cast iron, the spheroidal graphite cast iron having a composition comprising, in mass percentage: 2.8% or more and 3.3% or less of carbon; 2.5% or more and 4.0% or less of silicon; 0.32% or more and 0.40% or less of manganese; 0.020% or more and 0.030% or less of phosphorus; 0.020% or more and 0.035% or less of sulfur; 0.030% or more and 0.050% or less of magnesium; 0.010% or more and 0.050% or less in total of lanthanum and cerium; and 0.0020% or more and 0.0050% or less of calcium, with the balance being iron and inevitable impurities.
6 . The method for manufacturing a spheroidal graphite cast iron according to claim 5 ,
wherein the spheroidizing treatment agent is filled in an iron wire, and wherein the process of adding the spheroidizing treatment agent is performed by immersing the spheroidizing treatment agent filled in the wire, in the molten metal within a sealed space.
7 . The method for manufacturing a spheroidal graphite cast iron according to claim 5 , which further comprises a process of adding an inoculant to the molten metal to which the spheroidizing treatment agent is added.
8 . The method for manufacturing a spheroidal graphite cast iron according to claim 5 , which further comprises a process of performing heat treatment on the spheroidal graphite cast iron after the process of performing the casting to produce the spheroidal graphite cast iron.
9 . A spheroidizing treatment agent comprising, in mass percentage;
45% or more and 47% or less of silicon; 14% or more and 16% or less of magnesium; 4.5% or more and 8.0% or less in total of lanthanum and cerium; and 4.5% or more and 10% or less of calcium, with the balance being iron and inevitable impurities.
10 . The spheroidizing treatment agent according to claim 9 , further comprising, in mass percentage, 0.30% or more and 0.80% or less of aluminum.
11 . The spheroidizing treatment agent according to claim 9 , wherein the spheroidizing treatment agent is filled in an iron wire.
12 . The spheroidal graphite cast iron according to claim 2 , wherein, when a sulfur content expressed in mass percentage is S, an excess magnesium content RM expressed by the following equation is 0.015% or more and 0.045% or less
[
Equation
2
]
RM
=
Mg
-
[
S
-
{
(
La
+
Ce
)
2.93
+
Ca
1.25
}
]
×
0.76
.
13 . The spheroidal graphite cast iron according to claim 2 , further comprising, in mass percentage, 0.0020% or more and 0.0050% or less of aluminum.
14 . The spheroidal graphite cast iron according to claim 3 , further comprising, in mass percentage, 0.0020% or more and 0.0050% or less of aluminum.
15 . The method for manufacturing a spheroidal graphite cast iron according to claim 6 , which further comprises a process of adding an inoculant to the molten metal to which the spheroidizing treatment agent is added.
16 . The method for manufacturing a spheroidal graphite cast iron according to claim 6 , which further comprises a process of performing heat treatment on the spheroidal graphite cast iron after the process of performing the casting to produce the spheroidal graphite cast iron.
17 . The method for manufacturing a spheroidal graphite cast iron according to claim 7 , which further comprises a process of performing heat treatment on the spheroidal graphite cast iron after the process of performing the casting to produce the spheroidal graphite cast iron.
18 . The spheroidizing treatment agent according to claim 10 , wherein the spheroidizing treatment agent is filled in an iron wire.Join the waitlist — get patent alerts
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