US2026043120A1PendingUtilityA1
Carburizer and carburization method using the same
Est. expiryDec 7, 2038(~12.3 yrs left)· nominal 20-yr term from priority
C21C 5/52C21C 7/0037C21C 5/527Y02P10/20C23C 8/80C23C 8/66C23C 8/22C21C 7/00C21C 7/0025C23C 8/02
73
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Claims
Abstract
A carburizer, which effects carburization with respect to molten iron accommodated in an electric furnace or a ladle, includes a mixture of quicklime and a carbon material having an ash content of from 5 mass % to 18 mass %, and satisfies the conditions 0.6≤(mc+Mc)/ms≤2.7 and 0.7≤(mc+Mc)/ma≤6.5. A method of carburization uses this carburizer. Here, mc represents the mass of CaO in the carbon material, ms represents the mass of SiO 2 in the carbon material, ma represents the mass of Al 2 O 3 in the carbon material, and Mc represents the mass of the quicklime.
Claims
exact text as granted — not AI-modified1 . A method of carburization, comprising, in an electric furnace or a ladle, performing carburization by adding a carburizer to a molten iron surface formed by blowing in a gas and agitating the molten iron,
the carburizer comprising a mixture of quicklime and a carbon material having an ash content of from 5 mass % to 18 mass %, and the carburizer satisfying conditions stipulated in the following Formula (1) and Formula (2):
0
.
6
≤
(
mc
+
Mc
)
/
ms
≤
2.7
Formula
(
1
)
0.7
≤
(
mc
+
Mc
)
/
ma
≤
6
.
5
Formula
(
2
)
wherein, in Formula (1) and Formula (2), mc represents a mass of CaO in the carbon material, ms represents a mass of SiO 2 in the carbon material, ma represents a mass of Al 2 O 3 in the carbon material, and Mc represents a mass of the quicklime.
2 . The method of carburization recited in claim 1 , wherein the mixture satisfies conditions stipulated in the following Formula (1A) and Formula (2A):
0
.
6
≤
(
mc
+
Mc
)
/
ms
≤
1.9
Formula
(
1
A
)
0.7
≤
(
mc
+
Mc
)
/
ma
≤
5.
.
Formula
(
2
A
)
3 . The method of carburization recited in claim 1 , wherein the carburizer is added by being fed towards the molten iron surface from a lance.
4 . The method of carburization recited in claim 1 , wherein the carburizer is a briquette.
5 . The method of carburization recited in claim 1 , wherein a maximum particle size of the carbon material is 20 mm or less.
6 . The method of carburization recited in claim 1 , wherein the carbon material is coal containing 10% or more of volatile matter and has a maximum particle size of 100 mm or less.
7 . The method of carburization recited in claim 1 , wherein a maximum particle size of the quicklime is 10 mm or less.
8 . The method of carburization recited in claim 1 , wherein S concentration in the molten iron is 0.5 mass % or less.Join the waitlist — get patent alerts
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