Method of Manufacturing Ti-Containing Austenitic Stainless Steel Sheet by Twin Roll Strip Caster
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]
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . 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
]
2 . The method of claim 1 , wherein the molten steel comprises, by weight %, carbon (C): 0.025% to 0.055%, silicon (Si): 0.25% to 0.55%, manganese (Mn): 1.5% to 1.8%, chromium (Cr): 17.1% to 17.7%, nickel (Ni): 9.25% to 9.65%, titanium (Ti): 0.2% to 0.5%, nitrogen (N): 0.025% or less, and the balance of iron (Fe) and inevitable impurities.
3 . The method of claim 1 , wherein the molten steel has a Ti/C ratio of 8 or greater.Join the waitlist — get patent alerts
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