Invention Publication
- Patent Title: STEEL MATERIAL
-
Application No.: US18687374Application Date: 2022-09-22
-
Publication No.: US20240352566A1Publication Date: 2024-10-24
- Inventor: Kei MIYANISHI , Toshiharu AISO
- Applicant: NIPPON STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL CORPORATION
- Current Assignee: NIPPON STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Priority: JP 21154999 2021.09.24
- International Application: PCT/JP2022/035434 2022.09.22
- Date entered country: 2024-02-28
- Main IPC: C22C38/60
- IPC: C22C38/60 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/20 ; C22C38/22 ; C22C38/24 ; C22C38/26 ; C22C38/28 ; C22C38/30 ; C22C38/32 ; C22C38/38 ; C22C38/40
Abstract:
A steel material which is excellent in machinability, in which occurrence of cracks during hot working and melting cracks during induction hardening can be suppressed, and which has excellent fatigue strength when formed into a component for machine structural use is provided. A steel material of the present embodiment contains, in percent by mass, C: 0.05 to 0.30%, Si: 0.05 to 0.45%, Mn: 0.30 to 2.00%, P: 0.030% or less, S: 0.010 to 0.095%, Cr: 0.01 to 2.00%, Bi: 0.0051 to 0.1500%, and N: 0.0030 to 0.0250%, and satisfies the following Formula (1). In the steel material, a number density of fine Bi particles is 80 to 8000 pieces/mm2 and a number density of coarse Bi particles is 10 pieces/mm2 or less.
0.25
≤
C
+
(
Si
/
10
)
+
(
Mn
/
5
)
-
(
5
S
/
7
)
+
(
5
Cr
/
22
)
+
1.65
V
≤
1.
(
1
)
0.25
≤
C
+
(
Si
/
10
)
+
(
Mn
/
5
)
-
(
5
S
/
7
)
+
(
5
Cr
/
22
)
+
1.65
V
≤
1.
(
1
)
Information query
