Weld metal excellent in toughness and SR cracking resistance
AssigneeKobe Steel, Ltd.
InventorsYoshitomi Okazaki, Koichi Hosoi
Life of this patent
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Abstract
Provided is a weld metal for Cr—Mo steels which is suppressed in the formation of ferrite bands and therefore has heightened toughness and tensile strength and at the same time, good SR cracking resistance. The weld metal according to the present invention contains C: 0.02 to 0.06% (mass %, which will equally apply hereinafter), Si: 0.1 to 1.0%, Mn: 0.3 to 1.5%, Cr: 2.0 to 3.25%, Mo: 0.8 to 1.2%, Ti: 0.010 to 0.05%, B: 0.0005% or less (inclusive of 0%), N: 0.002 to 0.0120%, O: 0.03 to 0.07%, and the balance being Fe and inevitable impurities, wherein a ratio of the Ti content [Ti] to the N content [N] satisfies the following range: 2.00<[Ti]/[N]<6.25.
Claims10
A weld metal comprising:
- C:
- 0.02 to 0.06% (mass %, which will equally apply hereinafter);
- Si:
- 0.1 to 1.0%;
- Mn:
- 0.3 to 1.5%;
- Cr:
- 2.0 to 3.25%;
- Mo:
- 0.8 to 1.2%;
- Ti:
- 0.010 to 0.05%;
- B:
- 0.0003% or less (inclusive of 0%);
- N:
- 0.002 to 0.0120%;
- O:
- 0.03 to 0.07%;
- and
- Fe and inevitable impurities,
- wherein a ratio of the Ti content [Ti] to the N content [N] satisfies the following range:
- 2.00<[Ti]/[N]<6.25.
A weld metal comprising:
- C:
- 0.02 to 0.06% (mass %, which will equally apply hereinafter);
- Si:
- 0.1 to 1.0%;
- Mn:
- 0.3 to 1.5%;
- Cr:
- 2.0 to 3.25%;
- Mo:
- 0.8 to 1.2%;
- Ti:
- 0.020 to 0.035%;
- B:
- 0.0005% or less (inclusive of 0%);
- N:
- 0.002 to 0.0120%;
- O:
- 0.03 to 0.07%;
- and
- Fe and inevitable impurities,
- wherein a ratio of the Ti content [Ti] to the N content [N] satisfies the following range:
- 2.00<[Ti]/[N]<6.25.
Dependencies are inferred from the claim text.