JPWO2020203931A5 - - Google Patents
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- JPWO2020203931A5 JPWO2020203931A5 JP2021512091A JP2021512091A JPWO2020203931A5 JP WO2020203931 A5 JPWO2020203931 A5 JP WO2020203931A5 JP 2021512091 A JP2021512091 A JP 2021512091A JP 2021512091 A JP2021512091 A JP 2021512091A JP WO2020203931 A5 JPWO2020203931 A5 JP WO2020203931A5
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- welded joint
- stainless steel
- base material
- duplex stainless
- Prior art date
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- 229910001039 duplex stainless steel Inorganic materials 0.000 claims 7
- 239000000463 material Substances 0.000 claims 7
- 239000002184 metal Substances 0.000 claims 6
- 229910052751 metal Inorganic materials 0.000 claims 6
- 238000003466 welding Methods 0.000 claims 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 4
- 229910052757 nitrogen Inorganic materials 0.000 claims 4
- 229910001566 austenite Inorganic materials 0.000 claims 3
- 238000000034 method Methods 0.000 claims 3
- 239000010953 base metal Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 238000009863 impact test Methods 0.000 claims 1
- 239000012535 impurity Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000010998 test method Methods 0.000 claims 1
Claims (7)
C:0.001~0.050%、
Si:0.05~0.80%、
Mn:0.10%~2.00%、
Cr:23.00~26.00%、
Ni:4.50~6.00%、
Mo:1.00~2.00%、
N:0.150~0.250%、
Al:0.003~0.050%、
を含有し、
Oは0.0060%以下、
Pは0.050%以下、
Sは0.0050%以下に制限され、
かつ下記式(1)で定義されるPREN値が28.0以上35.0以下で、
残部がFe及び不純物からなる二相ステンレス鋼母材と、
溶接金属及び熱影響部とを含む溶接部とを備える溶接継手であって、
前記溶接金属の成分は、C、N及びOを除いて前記二相ステンレス鋼母材の成分からなり、
質量%で、C:0.001~0.060%、N:0.100~0.250%、O:0.0100%以下を含有し、
下記式(1)で定義されるPREN値が29.0以上であり、
前記二相ステンレス鋼母材のオーステナイト量は30~70面積%、前記溶接金属及び前記熱影響部のオーステナイト量はそれぞれ8~70面積%であって、
前記二相ステンレス鋼母材は、下記式(2)で定義するNI値が170以上であり、下記式(3)を満足し、
前記溶接金属は、下記式(2)で定義するNI値が222.8以上であり、下記式(3)を満足する
ことを特徴とする溶接継手。
PREN=Cr+3.3Mo+16N・・・(1)
NI=(Cr+Mo+2×Ni)/N・・・(2)
N≧(0.08Cr+0.08Mo-0.06Ni-1.21)/0.4×0.08・・・(3)
ただし、前記式(1)、(2)、(3)中における元素記号は、それぞれの元素の含有量(質量%)を示す。 By mass%,
C: 0.001 to 0.050%,
Si: 0.05 to 0.80%,
Mn: 0.10% to 2.00%,
Cr: 23.00 to 26.00%,
Ni: 4.50-6.00%,
Mo: 1.00 to 2.00%,
N: 0.150 to 0.250%,
Al: 0.003 to 0.050%,
Contains,
O is 0.0060% or less,
P is 0.050% or less,
S is limited to 0.0050% or less,
And the PREN value defined by the following formula (1) is 28.0 or more and 35.0 or less.
Duplex stainless steel base material with the balance consisting of Fe and impurities,
A welded joint comprising a weld metal and a welded portion including a heat-affected zone.
The components of the weld metal are composed of the components of the duplex stainless steel base material except for C, N and O.
By mass%, it contains C: 0.001 to 0.060%, N: 0.100 to 0.250%, O: 0.0100% or less.
The PREN value defined by the following equation (1) is 29.0 or more, and
The amount of austenite in the duplex stainless steel base material is 30 to 70 area%, and the amount of austenite in the weld metal and the heat-affected zone is 8 to 70 area%, respectively.
The duplex stainless steel base material has an NI value of 170 or more as defined by the following formula (2), and satisfies the following formula (3).
The weld metal is a welded joint having an NI value of 222.8 or more defined by the following formula (2) and satisfying the following formula (3) .
PREN = Cr + 3.3Mo + 16N ... (1)
NI = (Cr + Mo + 2 × Ni) / N ... (2)
N ≧ (0.08Cr + 0.08Mo-0.06Ni-1.21) /0.4 × 0.08 ... (3)
However, the element symbol in the formulas (1), (2) and (3) indicates the content (mass%) of each element.
Nb:0.150%以下、
Ti:0.020%以下、
Ta:0.200%以下、
Zr:0.050%以下、
Hf:0.080%以下、
Sn:0.100%以下、
W:1.00%以下、
Co:1.00%以下、
Cu:3.00%以下、
V:0.300%以下、
B:0.0050%以下、
Ca:0.0050%以下、
Mg:0.0050%以下、及び
REM:0.050%以下
からなる群のうち1種または2種以上を含有していることを特徴とする請求項1~4のうちいずれか1項に記載の溶接継手。 The duplex stainless steel base material and the weld metal further have Nb: 0.150% or less in mass%.
Ti: 0.020% or less,
Ta: 0.200% or less,
Zr: 0.050% or less,
Hf: 0.080% or less,
Sn: 0.100% or less,
W: 1.00% or less,
Co: 1.00% or less,
Cu: 3.00% or less,
V: 0.300% or less,
B: 0.0050% or less,
Ca: 0.0050% or less,
The present invention according to any one of claims 1 to 4, wherein one or more of the groups consisting of Mg: 0.0050% or less and REM: 0.050% or less are contained. Welded fittings.
Q=[溶接電流(A)]×[溶接電圧(V)]÷[溶接速度(cm/s)]・・・(4)
Nweld=Nbase×{0.978-0.0029×√(Q)}・・・(5)
但し、前記式(5)におけるNbaseは母材の窒素量(質量%)、Qは溶接入熱量Q(J/cm)を示す。 By controlling the welding heat input amount Q so that the value of Nweld defined by the following formula (5) is 0.100 to 0.250, the duplex stainless steel base material is not used. The method for manufacturing a welded joint according to any one of claims 1 to 6, wherein the shield gas does not contain nitrogen.
Q = [Welding current (A)] x [Welding voltage (V)] ÷ [Welding speed (cm / s)] ... (4)
Nweld = Nbase × {0.978-0.0029 × √ (Q)} ・ ・ ・ (5)
However, in the above formula (5), Nbase indicates the nitrogen content (mass%) of the base metal, and Q indicates the welding heat input amount Q (J / cm).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019069005 | 2019-03-29 | ||
JP2019069005 | 2019-03-29 | ||
PCT/JP2020/014390 WO2020203931A1 (en) | 2019-03-29 | 2020-03-27 | Duplex stainless steel welded joint and method for manufacturing same |
Publications (3)
Publication Number | Publication Date |
---|---|
JPWO2020203931A1 JPWO2020203931A1 (en) | 2020-10-08 |
JPWO2020203931A5 true JPWO2020203931A5 (en) | 2022-01-19 |
JP7270724B2 JP7270724B2 (en) | 2023-05-10 |
Family
ID=72668202
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2021512091A Active JP7270724B2 (en) | 2019-03-29 | 2020-03-27 | Duplex stainless steel weld joint and manufacturing method thereof |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP7270724B2 (en) |
KR (1) | KR102684006B1 (en) |
CN (1) | CN113631732B (en) |
WO (1) | WO2020203931A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2024024236A1 (en) * | 2022-07-29 | 2024-02-01 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5180611A (en) * | 1975-01-10 | 1976-07-14 | Toyo Soda Mfg Co Ltd | Anmoniasoodaho mataha enansoodahosochotaishokukinzokuzairyo |
JPS5345070U (en) | 1976-09-22 | 1978-04-17 | ||
US4832765A (en) * | 1983-01-05 | 1989-05-23 | Carpenter Technology Corporation | Duplex alloy |
JPS62267452A (en) | 1986-05-15 | 1987-11-20 | Nisshin Steel Co Ltd | Two-phase stainless steel excellent in corrosion resistance in weld zone |
JP3201178B2 (en) * | 1994-11-01 | 2001-08-20 | 住友金属工業株式会社 | Method for manufacturing duplex stainless steel welded pipe |
JPH1060597A (en) * | 1996-08-14 | 1998-03-03 | Sumitomo Metal Ind Ltd | High strength dual phase stainless steel excellent in toughness |
JP2004360035A (en) | 2003-06-06 | 2004-12-24 | Sanyo Special Steel Co Ltd | Duplex stainless steel excellent in stress corrosion cracking resistance |
JP5726537B2 (en) * | 2011-01-06 | 2015-06-03 | 山陽特殊製鋼株式会社 | Duplex stainless steel with excellent toughness |
EP2676763B1 (en) | 2011-02-14 | 2018-01-17 | Nippon Steel & Sumitomo Metal Corporation | Line pipe having a welded joint of duplex stainless steel |
JP5868206B2 (en) * | 2011-03-09 | 2016-02-24 | 新日鐵住金ステンレス株式会社 | Duplex stainless steel with excellent weld corrosion resistance |
CN102605288B (en) * | 2012-03-13 | 2015-03-25 | 宝山钢铁股份有限公司 | Economical double-phase stainless steel with good welding property and manufacturing method for stainless steel |
JP5857914B2 (en) * | 2012-08-23 | 2016-02-10 | 新日鐵住金株式会社 | Welding material for duplex stainless steel |
CN102941402B (en) * | 2012-11-09 | 2016-04-20 | 太原科技大学 | A kind of welding method of super-duplex stainless steel |
JP6614785B2 (en) | 2015-03-30 | 2019-12-04 | 日鉄ステンレス株式会社 | Alloy-saving duplex stainless steel laser welded member with good laser weld characteristics and manufacturing method of alloy-saving duplex stainless steel laser welded member |
JP6726499B2 (en) * | 2016-03-29 | 2020-07-22 | 日鉄ステンレス株式会社 | Duplex Stainless Steel Weld Joint, Duplex Stainless Steel Welding Method, and Duplex Stainless Steel Weld Joint Manufacturing Method |
-
2020
- 2020-03-27 CN CN202080023991.9A patent/CN113631732B/en active Active
- 2020-03-27 JP JP2021512091A patent/JP7270724B2/en active Active
- 2020-03-27 KR KR1020217030232A patent/KR102684006B1/en active IP Right Grant
- 2020-03-27 WO PCT/JP2020/014390 patent/WO2020203931A1/en active Application Filing
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