US 2015/0174647 A1Published application

Method of Manufacturing Ti-Containing Austenitic Stainless Steel Sheet by Twin Roll Strip Caster

AssigneePosco

InventorsSung-Jin Park, Byoung-Jun Song, Dae Sung Lee

Life of this patent

Estimating the term…

Loading patent…

Abstract

There is provided a method of manufacturing a titanium (Ti)-containing austenitic stainless steel sheet having a high degree of surface quality by using a twin roll strip caster. The method includes controlling a composition of molten steel such that a TiN precipitation temperature may be higher than a temperature of the molten steel in a tundish (T/D) by at least 50° C. (ΔT≧50° C.), the TiN precipitation temperature being defined by the following formula 2: Log(N%)=−19,755/(T+273)+7.78+0.07[% Ti]−log [% Ti]+ 0.045[% Cr] T(° C.)=−19,755/log(N%)−7.78−0.07(%Ti)+log(%ti)−0.045(%Cr)−273 [Formula 2]

Claims3

Dependent claims

A method of manufacturing a titanium (Ti)-containing austenitic stainless steel sheet having a high degree of surface quality by using a twin roll strip casting process, the method comprising controlling a composition of molten steel such that a TiN precipitation temperature is higher than a temperature of the molten steel in a tundish (T/D) by at least 50° C. (ΔT≧50° C.), the TiN precipitation temperature being defined by the following formula 2:

Log

(
N


%
)
=
-
19
,
755
/
(
T
+
273
)
+
7.78
+
0.07

[
%


Ti
]
-
log

[
%


Ti
]
+
0.045

[
%


Cr
]


T

(
°


C
.
)
=
-
19
,
755
log

(
N


%
)
-
7.78
-
0.07

(
%


Ti
)
+
log

(
%


Ti
)
-
0.045

(
%


Cr
)
-
273
[
Formula


2
]

106 more elements

Dependencies are inferred from the claim text.