Ni-based alloy pipe for nuclear power
AssigneeNippon Steel Corporation
InventorsKiyoko Takeda, Hirokazu Okada, Osamu Miyahara
Life of this patent
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Abstract
An Ni-based alloy pipe for nuclear power has a chemical composition consisting of, in mass percent: C: 0.015 to 0.030%, Si: 0.10 to 0.50%, Mn: 0.10 to 0.50%, P: 0.040% or less, S: 0.015% or less, Cu: 0.01 to 0.20%, Ni: 50.0 to 65.0%, Cr: 19.0 to 35.0%, Mo: 0 to 0.40%, Co: 0.040% or less, Al: 0.30% or less, N: 0.010 to 0.080%, Ti: 0.020 to 0.180%, Zr: 0.010% or less, and Nb: 0.060% or less, the balance: Fe and impurities, and satisfying [(N−Ti×14/48)×d3≥4000] in relation to an average grain diameter, wherein a standard deviation of grain diameters is 20 μm or less, and a hardness of insides of grains is 180 HV or more.
Claims4
An Ni-based alloy pipe for nuclear power, having a chemical composition consisting of, in mass percent:
- C:
- 0.015 to 0.030%,
- Si:
- 0.10 to 0.50%,
- Mn:
- 0.10 to 0.50%,
- P:
- 0.040% or less,
- S:
- 0.015% or less,
- Cu:
- 0.01 to 0.20%,
- Ni:
- 50.0 to 65.0%,
- Cr:
- 19.0 to 35.0%,
- Mo:
- 0 to 0.40%,
- Co:
- 0.040% or less,
- Al:
- 0.30% or less,
- N:
- 0.010 to 0.080%,
- Ti:
- 0.020 to 0.180%,
- Zr:
- 0.010% or less,
- Nb:
- 0.060% or less,
- the balance:
- Fe and impurities, and
- satisfying Formula (i) in relation to an average grain diameter, wherein
- a standard deviation of grain diameters is 20 μm or less, and
- a hardness of insides of grains is 180 HV or more;
- (N−Ti×14/48)×d34000 (i)
- where meanings of symbols in the above formula are as follows,
- N:
- an N content in the alloy (mass %)
- Ti:
- a Ti content in the alloy (mass %)
- d:
- Average grain diameter (μm).
An Ni-based alloy pipe for nuclear power, having a chemical composition comprising, in mass percent:
- C:
- 0.015 to 0.030%,
- Si:
- 0.10 to 0.50%,
- Mn:
- 0.10 to 0.50%,
- P:
- 0.040% or less,
- S:
- 0.015% or less,
- Cu:
- 0.01 to 0.20%,
- Ni:
- 50.0 to 65.0%,
- Cr:
- 19.0 to 35.0%,
- Mo:
- 0 to 0.40%,
- Co:
- 0.040% or less,
- Al:
- 0.30% or less,
- N:
- 0.010 to 0.080%,
- Ti:
- 0.02.0 to 0.180%,
- Zr:
- 0.010% or less,
- Nb:
- 0.060% or less,
- the balance:
- Fe and impurities, and
- satisfying Formula (i) in relation to an average grain diameter, wherein
- a standard deviation of grain diameters is 20 μm or less, and
- a hardness of insides of grains is 180 HV or more;
- (N−Ti×14/48)×d34000 (i)
- where meanings of symbols in the above formula are as follows,
- N:
- an N content in the alloy (mass %)
- Ti:
- a Ti content in the alloy (mass %)
- d:
- Average grain diameter (μm).
Dependencies are inferred from the claim text.