US 2026/0209907 A1Published application

Hot-rolled steel sheet for tube of hyper tube train and method for producing same

AssigneePosco

InventorsHong-Seok YANG, Min-Gyu NOH, Jung-Hae CHO, Jun-Hyuk HA, Hyeon-Woo KIM

Life of this patent

Estimating the term…

Loading patent…

Abstract

The present disclosure relates to a hot-rolled steel sheet for a tube of a hyper tube train and a method for producing same, the steel sheet having excellent yield strength, vibration damping ratio, weldability, and weld site-low temperature toughness. The hot-rolled steel sheet for a tube of a hyper tube train according to the present disclosure comprises, in weight %, carbon (C): 0.03-0.11%, silicon (Si): 0.3-1.5%, cobalt (Co): 1-3%, manganese (Mn): 1.2-2.2%, and the balance being Fe and inevitable impurities, and having, as a final microstructure, a composite structure including ferrite and pearlite.

Claims17

Dependent claims

A hot-rolled steel sheet for a tube of a vacuum tube train, the hot-rolled steel sheet comprising, in wt %, carbon (C):

0.03 to 0.11%, silicon (Si):
0.3 to 1.5%, cobalt (Co):
1 to 3%, manganese (Mn):
1.2 to 2.2%, and remaining Fe and other inevitable impurities,
wherein a final microstructure has a composite structure including ferrite and perlite,
wherein the hot-rolled steel sheet satisfies following Relational Expressions 1 and 2:
355
≤
(
11
+
394
×
D
-
0.5
)
+
(
448
×
[
C
]
)
+
(
94
×
[
Si
]
)
+
(
36.5
×
[
Co
]
)
+
(
69
×
[
Mn
]
)
+
(
3
,
TagBox[",", "NumberComma", Rule[SyntaxForm, "0"]]
429
×
[
Nb
]
)
[
Relational
⁢
Expression
⁢
1
]
150
≤
(
186
-
210
×
D
-
0.5
)
-
(
121
×
[
C
]
)
+
(
13.2
×
[
Si
]
)
+
(
31.1
×
[
Co
]
)
-
(
13.7
×
[
Mn
]
)
-
(
4
,
TagBox[",", "NumberComma", Rule[SyntaxForm, "0"]]
723
×
[
Nb
]
)
[
Relational
⁢
Expression
⁢
2
]
(wherein in the Relational Expressions 1 and 2, D denotes an average crystal grain size of ferrite of the hot-rolled steel sheet, and [ ] denotes weight % of each element).

126 more elements

Dependencies are inferred from the claim text.