Cr containing steel for welded structure
Abstract
The present invention provides Cr-containing steel that has satisfactory levels in all of toughness, strength (hardness) and corrosion resistance of HAZ, and that is suitably used as parts for welded structures. Specifically, the present invention provides Cr-containing steel used for a welded structure, the steel being featured or characterized by containing, by mass %, C: not more than 0.020%, Si: not more than 1.00%, Mn: 1.0 to 5.0%, P: not more than 0.050%, S: not more than 0.020%, Cr: 6.0 to 15.0%, Ni: not more than 1.0%, Al: not more than 0.100%, N: not more than 0.020%, and V: 0.03 to 0.30%, the balance consisting of Fe and unavoidable impurities, or further containing Cu: 0.10 to 2.00% or less and Mo: 0.40 to 3.00% or less, wherein an F or F′ value calculated by putting values of contents (mass %) of the respective components in the following formula (1) or (2) is not larger than 13.50: F value = Cr + 0.4 × Si + 0.2 × Al + 5 × P - 0.4 × Mn - 0.7 × Ni - 35 × C - 10 × N + 10 × V ( 1 ) F ′ value = Cr + 0.6 × Mo + 0.4 × Si + 0.2 × Al + 5 × P - 0.4 × Mn - 0.7 × Ni - 0.6 × Cu - 35 × C - 10 × N + 10 × V ( 2 )
Claims
exact text as granted — not AI-modified1 . Cr-containing steel used for a welded structure, the steel containing, by mass %, C: not more than 0.020%, Si: not more than 1.00%, Mn: 1.0 to 5.0%, P: not more than 0.050%, S: not more than 0.020%, Cr: 6.0 to 15.0%, Ni: 0.10 to 1.00% or less, Al: not more than 0.100%, N: not more than 0.020%, and V: 0.03 to 0.30%, the balance consisting of Fe and unavoidable impurities, wherein an F value calculated by putting values of contents of the respective components in the following formula (1) is not larger than 13.50:
F
value
=
Cr
+
0.4
×
Si
+
0.2
×
Al
+
5
×
P
-
0.4
×
Mn
-
0.7
×
Ni
-
35
×
C
-
10
×
N
+
10
×
V
.
(
1
)
2 . Cr-containing steel used for a welded structure according to claim 1 , wherein the steel further contains Cu: 0.10 to 2.00% and Mo: 0.40 to 3.00%, the balance consisting of Fe and unavoidable impurities, and an F′ value calculated by putting values of contents of the respective components in the following formula (2) is not larger than 13.50:
F
′
value
=
Cr
+
0.6
×
Mo
+
0.4
×
Si
+
0.2
×
Al
+
5
×
P
-
0.4
×
Mn
-
0.7
×
Ni
-
0.6
×
Cu
-
35
×
C
-
10
×
N
+
10
×
V
.
(
2
)
3 . Cr-containing steel used for a welded structure according to claim 1 or 2 , wherein the steel further contains B: 0.0003 to 0.0050% by mass %.
4 . Cr-containing steel used for a welded structure according to any one of claims 1 to 4 , wherein the Cr-containing steel is a hot-rolled plate.
5 . Cr-containing steel used for a welded structure according to any one of claims 1 to 4 , wherein the Cr-containing steel is a cold-rolled plate subjected to cold rolling after hot rolling.Join the waitlist — get patent alerts
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