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1. 发明授权

US09303296B2 High-strength stainless steel for oil well and high-strength stainless steel pipe for oil well 有权
标题翻译：油井高强度不锈钢和油井高强度不锈钢管
公开(公告)号：US09303296B2
公开(公告)日：2016-04-05
申请号：US13607957
申请日：2012-09-10
申请人： Taro Ohe , Hisashi Amaya , Hideki Takabe , Kunio Kondo , Yohei Otome
发明人： Taro Ohe , Hisashi Amaya , Hideki Takabe , Kunio Kondo , Yohei Otome
IPC分类号： C21D8/10 , C22C38/42 , C22C38/44
CPC分类号： C21D8/10 , C21D8/105 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , Y10T428/12292
摘要： A high-strength stainless steel for oil well having corrosion resistance excellent in a high-temperature environment, having excellent SSC resistance at normal temperature, and having better workability than 13% Cr steels has a chemical composition containing, by mass percent, C: at most 0.05%, Si: at most 1.0%, Mn: at most 0.3%, P: at most 0.05%, S: less than 0.002%, Cr: over 16% and at most 18%, Mo: 1.5 to 3.0%, Cu: 1.0 to 3.5%, Ni: 3.5 to 6.5%, Al: 0.001 to 0.1%, N: at most 0.025%, and O: at most 0.01%, the balance being Fe and impurities, a microstructure containing a martensite phase, 10 to 48.5%, by volume ratio, of a ferrite phase and at most 10%, by volume ratio, of a retained austenite phase, yield strength of at least 758 MPa and uniform elongation of at least 10%.
摘要翻译：在高温环境下耐腐蚀性优异，在常温下具有优异的耐SSC性，并且具有比13％Cr钢更好的加工性的油井用高强度不锈钢具有以质量％计含有C：at 最多0.05％，Si：1.0％以下，Mn：0.3％以下，P：0.05％以下，S：小于0.002％，Cr：16％以上18％以下，Mo：1.5〜3.0％ Cu：1.0〜3.5％，Ni：3.5〜6.5％，Al：0.001〜0.1％，N：0.025％以下，O：0.01％以下，余量为Fe，杂质，含有马氏体相的组织， 10 -48.5％体积比的铁素体相和至少10％的残余奥氏体相的体积比，至少758MPa的屈服强度和至少10％的均匀伸长率。

2. 发明授权

US09109268B2 Stainless steel for oil well, stainless steel pipe for oil well, and method of manufacturing stainless steel for oil well 有权
标题翻译：油井不锈钢，油井不锈钢管，油井不锈钢制造方法
公开(公告)号：US09109268B2
公开(公告)日：2015-08-18
申请号：US13276374
申请日：2011-10-19
申请人： Hideki Takabe , Kunio Kondo , Hisashi Amaya , Taro Ohe , Yohei Otome
发明人： Hideki Takabe , Kunio Kondo , Hisashi Amaya , Taro Ohe , Yohei Otome
IPC分类号： C22C38/42 , C21D8/02 , C21D8/10 , C21D9/08 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44 , F16L9/02
CPC分类号： C22C38/50 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/005 , C21D8/0205 , C21D8/105 , C21D9/08 , C21D9/085 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/004 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , F16L9/02
摘要： The chemical composition of a stainless steel in accordance with the present invention consists of C: not more than 0.05%, Si: not more than 0.5%, Mn: 0.01 to 0.5%, P: not more than 0.04%, S: not more than 0.01%, Cr: more than 16.0 and not more than 18.0%, Ni: more than 4.0 and not more than 5.6%, Mo: 1.6 to 4.0%, Cu: 1.5 to 3.0%, Al: 0.001 to 0.10%, and N: not more than 0.050%, the balance being Fe and impurities, and satisfies Formulas (1) and (2). Also, the micro-structure thereof contains a martensitic phase and a ferritic phase having a volume ratio of 10 to 40%, and the ferritic phase distribution ratio is higher than 85%. Cr+Cu+Ni+Mo≧25.5 (1) −8≦30(C+N)+0.5Mn+Ni+Cu/2+8.2−1.1(Cr+Mo)≦−4 (2)
摘要翻译：根据本发明的不锈钢的化学组成由C：不大于0.05％，Si：不大于0.5％，Mn：0.01至0.5％，P：不大于0.04％，S：不大于 0.01％以上，Cr：16.0以上18.0％以下，Ni：4.0以上5.6％以下，Mo：1.6〜4.0％，Cu：1.5〜3.0％，Al：0.001〜0.10％ N：不大于0.050％，余量为Fe和杂质，并满足式（1）和（2）。此外，其微结构含有马氏体相和体积比为10〜40％的铁素体相，铁素体相分布比高于85％。 Cr + Cu + Ni +Mo≥25.5（1）-8＆nlE; 30（C + N）+ 0.5Mn + Ni + Cu / 2 + 8.2-1.1（Cr + Mo）＆nlE; -4（2）

3. 发明申请

US20120328897A1 HIGH-STRENGTH STAINLESS STEEL FOR OIL WELL AND HIGH-STRENGTH STAINLESS STEEL PIPE FOR OIL WELL 有权
标题翻译：用于油井的高强度不锈钢和用于油井的高强度不锈钢管
公开(公告)号：US20120328897A1
公开(公告)日：2012-12-27
申请号：US13607957
申请日：2012-09-10
申请人： Taro OHE , Hisashi Amaya , Hideki Takabe , Kunio Kondo , Yohei Otome
发明人： Taro OHE , Hisashi Amaya , Hideki Takabe , Kunio Kondo , Yohei Otome
IPC分类号： C22C38/42 , C22C38/46 , B32B15/01 , C22C38/50 , C22C38/54 , B32B1/08 , C22C38/44 , C22C38/48
CPC分类号： C21D8/10 , C21D8/105 , C21D2211/005 , C21D2211/008 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , Y10T428/12292
摘要： A high-strength stainless steel for oil well having corrosion resistance excellent in a high-temperature environment, having excellent SSC resistance at normal temperature, and having better workability than 13% Cr steels has a chemical composition containing, by mass percent, C: at most 0.05%, Si: at most 1.0%, Mn: at most 0.3%, P: at most 0.05%, S: less than 0.002%, Cr: over 16% and at most 18%, Mo: 1.5 to 3.0%, Cu: 1.0 to 3.5%, Ni: 3.5 to 6.5%, Al: 0.001 to 0.1%, N: at most 0.025%, and O: at most 0.01%, the balance being Fe and impurities, a microstructure containing a martensite phase, 10 to 48.5%, by volume ratio, of a ferrite phase and at most 10%, by volume ratio, of a retained austenite phase, yield strength of at least 758 MPa and uniform elongation of at least 10%.
摘要翻译：在高温环境下耐腐蚀性优异，在常温下具有优异的耐SSC性，并且具有比13％Cr钢更好的加工性的油井用高强度不锈钢具有以质量％计含有C：at 最多0.05％，Si：1.0％以下，Mn：0.3％以下，P：0.05％以下，S：小于0.002％，Cr：16％以上18％以下，Mo：1.5〜3.0％ Cu：1.0〜3.5％，Ni：3.5〜6.5％，Al：0.001〜0.1％，N：0.025％以下，O：0.01％以下，余量为Fe，杂质，含有马氏体相的组织， 10 -48.5％体积比的铁素体相和至少10％的残余奥氏体相的体积比，至少758MPa的屈服强度和至少10％的均匀伸长率。

4. 发明申请

US20110014083A1 STAINLESS STEEL USED FOR OIL COUNTRY TUBULAR GOODS 审中-公开
标题翻译：不锈钢用于油田国家管件
公开(公告)号：US20110014083A1
公开(公告)日：2011-01-20
申请号：US12892045
申请日：2010-09-28
申请人： Hisashi Amaya , Kunio Kondo , Hideki Takabe , Taro Ohe
发明人： Hisashi Amaya , Kunio Kondo , Hideki Takabe , Taro Ohe
IPC分类号： C22C38/44 , C22C38/42 , C22C38/58
CPC分类号： C22C38/42 , C21D1/25 , C21D6/004 , C21D9/14 , C21D9/46 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50
摘要： A stainless steel for an oil country tubular good according to the invention includes, in percent by mass, 0.001% to 0.05% C, 0.05% to 1% Si, at most 2% Mn, at most 0.03% P, less than 0.002% S, 16% to 18% Cr, 3.5% to 7% Ni, more than 2% and at most 4% Mo, 1.5% to 4% Cu, 0.001% to 0.3% rare earth metal, 0.001% to 0.1% sol. Al, 0.0001% to 0.01% Ca, at most 0.05% O, and at most 0.05% N, and the balance consists of Fe and impurities. The stainless steel according to the invention includes REM and therefore has high SCC resistance in a high temperature chloride aqueous solution environment.
摘要翻译：根据本发明的用于油井管状的不锈钢以质量％计含有0.001％至0.05％的C，0.05％至1％的Si，至多2％的Mn，至多0.03％的P，小于0.002％ S，16％〜18％的Cr，3.5％〜7％的Ni，2％以上4％以下的Mo，1.5％〜4％的Cu，0.001％〜0.3％的稀土金属，0.001〜0.1质量％的溶胶。 Al，0.0001％至0.01％Ca，最多0.05％O和至多0.05％N，余量由Fe和杂质组成。根据本发明的不锈钢包括REM，因此在高温氯化物水溶液环境中具有高SCC电阻。

5. 发明授权

US08608872B2 High-strength stainless steel pipe excellent in sulfide stress cracking resistance and high-temperature carbonic-acid gas corrosion resistance 有权
标题翻译：高强度不锈钢管具有优异的耐硫化应力开裂性和高温碳酸气体耐腐蚀性能
公开(公告)号：US08608872B2
公开(公告)日：2013-12-17
申请号：US13082432
申请日：2011-04-08
申请人： Kunio Kondo , Hisashi Amaya , Hideki Takabe , Taro Ohe
发明人： Kunio Kondo , Hisashi Amaya , Hideki Takabe , Taro Ohe
IPC分类号： C22C38/42 , C22C38/44
CPC分类号： C22C38/42 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44
摘要： The problem to be solved is the provision of a high-strength stainless steel pipe having a sufficient corrosion resistance in a high-temperature carbonic acid gas environment and having an excellent sulfide stress cracking resistance at normal temperature. A high-strength stainless steel pipe consist of, by mass %, C: 0.05% or less, Si: 1.0% or less, P: 0.05% or less, S: less than 0.002%, Cr: more than 16% and 18% or less, Mo: more than 2% and 3% or less, Cu: 1% to 3.5%, Ni: 3% or more and less than 5%, Al: 0.001% to 0.1% and O: 0.01% or less, Mn: 1% or less and N: 0.05% or less, and Mn and N in the above ranges satisfy formula (1), and the balance being Fe and impurities; and the metal micro-structure of the stainless steel pipe mainly includes a martensitic phase and comprises 10 to 40% of a ferritic phase by volume fraction and 10% or less of a retained γ-phase by volume fraction. [Mn]×([N]−0.0045)≦0.001 (1) wherein the symbols of elements in formula (1) respectively represent the contents (unit: mass %) of the elements in the steel.
摘要翻译：要解决的问题是在高温碳酸气体环境中提供具有足够耐腐蚀性的高强度不锈钢管，并且在常温下具有优异的耐硫化物应力开裂性。高强度不锈钢管以质量％计含有C：0.05％以下，Si：1.0％以下，P：0.05％以下，S：小于0.002％，Cr：16％以上18以下％以下，Mo：大于2％，3％以下，Cu：1〜3.5％，Ni：3％以上且小于5％，Al：0.001〜0.1％，O：0.01％以下，Mn：1％以下，N：0.05％以下，上述范围的Mn和N满足式（1），余量为Fe和杂质; 并且不锈钢管的金属微结构主要包括马氏体相，并且包含10〜40体积％的铁素体相和10体积％以下的γ相。 [Mn]×（[N] -0.0045）@ 0.001（1）其中，式（1）中的元素的符号分别表示钢中元素的含量（单位：质量％）。

6. 发明申请

US20110226378A1 HIGH-STRENGTH STAINLESS STEEL PIPE EXCELLENT IN SULFIDE STRESS CRACKING RESISTANCE AND HIGH-TEMPERATURE CARBONIC-ACID GAS CORROSION RESISTANCE 有权
标题翻译：高强度不锈钢管优良的耐硫酸盐耐应力和高温碳酸气体耐腐蚀性
公开(公告)号：US20110226378A1
公开(公告)日：2011-09-22
申请号：US13082432
申请日：2011-04-08
申请人： Kunio KONDO , Hisashi Amaya , Hideki Takabe , Taro Ohe
发明人： Kunio KONDO , Hisashi Amaya , Hideki Takabe , Taro Ohe
IPC分类号： F16L9/00
CPC分类号： C22C38/42 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/44
摘要： The problem to be solved is the provision of a high-strength stainless steel pipe having a sufficient corrosion resistance in a high-temperature carbonic acid gas environment and having an excellent sulfide stress cracking resistance at normal temperature.A high-strength stainless steel pipe consist of by mass %, C: 0.05% or less, Si: 1.0% or less, P: 0.05% or less, S: less than 0.002%, Cr: more than 16% and 18% or less, Mo: more than 2% and 3% or less, Cu: 1% to 3.5%, Ni: 3% or more and less than 5%, Al: 0.001% to 0.1% and O: 0.01% or less, Mn: 1% or less and N: 0.05% or less, and Mn and N in the above ranges satisfy formula (1), and the balance being Fe and impurities; and the metal micro-structure of the stainless steel pipe mainly includes a martensitic phase and comprises 10 to 40% of a ferritic phase by volume fraction and 10% or less of a retained γ-phase by volume fraction. [Mn]×([N]−0.0045)≦0.001 (1) wherein the symbols of elements in formula (1) respectively represent the contents (unit: mass %) of the elements in the steel.
摘要翻译：要解决的问题是在高温碳酸气体环境中提供具有足够耐腐蚀性的高强度不锈钢管，并且在常温下具有优异的耐硫化物应力开裂性。高强度不锈钢管以质量％计，C：0.05％以下，Si：1.0％以下，P：0.05％以下，S：小于0.002％，Cr：16％以上18％以下，Mo：大于2％和3％以下，Cu：1〜3.5％，Ni：3％以上且小于5％，Al：0.001〜0.1％，O：0.01％以下， Mn：1％以下，N：0.05％以下，上述范围的Mn和N满足式（1），余量为Fe和杂质; 并且不锈钢管的金属微结构主要包括马氏体相，并且含有10〜40体积％的铁素体系相和10体积％以下的γ相。 [Mn]×（[N] -0.0045）＆nlE; 0.001（1）其中，式（1）中的元素的符号分别表示钢中的元素的含量（单位：质量％）。

7. 发明授权

US08071020B2 High strength Cr-Ni alloy material and seamless pipe for oil well 有权
标题翻译：高强度Cr-Ni合金材料和油井无缝管
公开(公告)号：US08071020B2
公开(公告)日：2011-12-06
申请号：US12485270
申请日：2009-06-16
申请人： Yohei Otome , Masaaki Igarashi , Hisashi Amaya , Hirokazu Okada
发明人： Yohei Otome , Masaaki Igarashi , Hisashi Amaya , Hirokazu Okada
IPC分类号： C22C28/00 , C22C38/42 , C22C38/44
CPC分类号： C22C38/02 , C22C38/001 , C22C38/005 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , Y10S148/909
摘要： A high strength Cr—Ni alloy material excellent in hot workability and stress corrosion cracking resistance, and seamless pipe for oil well application which consists of, by mass percent, C: 0.05% or less, Si: 0.05 to 1.0%, Mn: 0.01% or more and less than 3.0%, P: 0.05% or less, S: 0.005% or less, Cu: 0.01 to 4%, Ni: 25% or more and less than 35%, Cr: 20 to 30%, Mo: 0.01% or more and less than 4.0%, N: 0.10 to 0.30%, Al: 0.03 to 0.30%, O (oxygen): 0.01% or less, and REM (rare earth metal): 0.01 to 0.20% with the balance being Fe and impurities, and also satisfies the conditions in the following formula (1). N×P/REM≦0.40 formula (1) where P, N, and REM in the formula (1) respectively denote the contents (mass %) of P, N, and REM. The high strength Cr—Ni alloy material may further contain one or more types of W, Ti, Nb, Zr, V, Ca, and Mg, instead of part of Fe.
摘要翻译： C：0.05％以下，Si：0.05〜1.0％，Mn：0.01％以下的质量％以上的油井用无缝管，耐热加工性和耐应力腐蚀开裂性优异的高强度Cr-Ni合金材料％以上且小于3.0％，P：0.05％以下，S：0.005％以下，Cu：0.01〜4％，Ni：25％以上且小于35％，Cr：20〜30％，Mo ：0.01％以上且小于4.0％，N：0.10〜0.30％，Al：0.03〜0.30％，O（氧）：0.01％以下，REM（稀土金属）：0.01〜0.20％为Fe和杂质，也满足下式（1）的条件。式（1）中的P，N，REM分别表示P，N，REM的含量（质量％），N×P / REM＆nlE 0.40。高强度Cr-Ni合金材料可以进一步含有一种或多种W，Ti，Nb，Zr，V，Ca和Mg而不是Fe的一部分。

8. 发明申请

US20090291017A1 HIGH STRENGTH Cr-Ni ALLOY MATERIAL AND SEAMLESS PIPE FOR OIL WELL 有权
标题翻译：高强度Cr-Ni合金材料和无缝管油
公开(公告)号：US20090291017A1
公开(公告)日：2009-11-26
申请号：US12485270
申请日：2009-06-16
申请人： Yohei Otome , Masaaki Igarashi , Hisashi Amaya , Hirokazu Okada
发明人： Yohei Otome , Masaaki Igarashi , Hisashi Amaya , Hirokazu Okada
IPC分类号： C22C30/02
CPC分类号： C22C38/02 , C22C38/001 , C22C38/005 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , Y10S148/909
摘要： [Object] To provide a high strength Cr—Ni alloy material excellent in hot workability and stress corrosion cracking resistance, and seamless pipe for oil well.[Solution] A high strength Cr—Ni alloy material which consists of, by mass percent, C: 0.05% or less, Si: 0.05 to 1.0%, Mn: 0.01% or more and less than 3.0%, P: 0.05% or less, S: 0.005% or less, Cu: 0.01 to 4%, Ni: 25% or more and less than 35%, Cr: 20 to 30%, Mo: 0.01% or more and less than 4.0%, N: 0.10 to 0.30%, Al: 0.03 to 0.30%, O (oxygen): 0.01% or less, and REM (rare earth metal): 0.01 to 0.20%, with the balance being Fe and impurities, and also satisfies the conditions in the following formula (1). N×P/REM≦0.40 formula (1) where P, N, and REM in the formula (1) respectively denote the contents (mass %) of P, N, and REM. The high strength Cr—Ni alloy material may further contain one or more types of W, Ti, Nb, Zr, V, Ca, and Mg, instead of part of Fe.
摘要翻译：本发明提供热加工性和耐应力腐蚀开裂性优异的高强度Cr-Ni合金材料，以及油井无缝管。 [方案]一种高强度Cr-Ni合金材料，以质量％计含有C：0.05％以下，Si：0.05〜1.0％，Mn：0.01％以上且小于3.0％，P：0.05％以上较少，S：0.005％以下，Cu：0.01〜4％，Ni：25％以上且小于35％，Cr：20〜30％，Mo：0.01％以上且4.0％以下N：0.10 至0.30％，Al：0.03〜0.30％，O（氧）0.01％以下，REM（稀土金属）：0.01〜0.20％，余量为Fe和杂质，也满足以下条件公式1）。 NxP / REM其中，式（1）中的P，N和REM分别表示P，N和REM的含量（质量％）。高强度Cr-Ni合金材料可以进一步含有一种或多种W，Ti，Nb，Zr，V，Ca和Mg而不是Fe的一部分。

9. 发明授权

US08163233B2 Martensitic stainless steel for welded structures 有权
标题翻译：用于焊接结构的马氏体不锈钢
公开(公告)号：US08163233B2
公开(公告)日：2012-04-24
申请号：US12379724
申请日：2009-02-27
申请人： Hisashi Amaya , Kazuhiro Ogawa , Akira Taniyama , Masakatsu Ueda , Hideki Takabe
发明人： Hisashi Amaya , Kazuhiro Ogawa , Akira Taniyama , Masakatsu Ueda , Hideki Takabe
IPC分类号： C22C38/44 , C22C38/42
CPC分类号： C22C38/02 , C22C38/005 , C22C38/04 , C22C38/06 , C22C38/40
摘要： A martensitic stainless steel for welded structures including by mass %, C: 0.001 to 0.05%, Si: 0.05 to 1%, Mn: 0.05 to 2%, P: 0.03% or less, REM: 0.0005 to 0.1%, Cr: 8 to 16%, Ni: 0.1 to 9% and sol. Al: 0.001 to 0.1%; and further including one or more elements selected from among Ti: 0.005 to 0.5%, Zr: 0.005 to 0.5%, Hf: 0.005 to 0.5%, V: 0.005 to 0.5% and Nb: 0.005 to 0.5%; and O: 0.005% or less, N: 0.1% or less, with the balance being Fe and impurities; and the P and REM content satisfies: P≦0.6×REM. This steel possesses excellent SCC (stress corrosion cracking) resistance in welded sections in Sweet environments.
摘要翻译：焊接结构的马氏体系不锈钢，以质量％计，C：0.001〜0.05％，Si：0.05〜1％，Mn：0.05〜2％，P：0.03％以下，REM：0.0005〜0.1％，Cr：8 至16％，Ni：0.1〜9％，溶胶。 Al：0.001〜0.1％进一步包括选自Ti：0.005〜0.5％，Zr：0.005〜0.5％，Hf：0.005〜0.5％，V：0.005〜0.5％，Nb：0.005〜0.5％的一种或多种元素; O：0.005％以下，N：0.1％以下，余量为Fe和杂质; P和REM含量满足：P＆nlE; 0.6×REM。这种钢在甜蜜环境中的焊接部分具有优异的SCC（应力腐蚀开裂）性。

10. 发明授权

US10000832B2 Duplex stainless steel 有权
公开(公告)号：US10000832B2
公开(公告)日：2018-06-19
申请号：US14342039
申请日：2012-08-28
申请人： Hideki Takabe , Hisashi Amaya , Kazuhiro Ogawa
发明人： Hideki Takabe , Hisashi Amaya , Kazuhiro Ogawa
IPC分类号： C22C38/58 , C21D9/08 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/54 , C21D6/00 , C21D9/50
CPC分类号： C22C38/58 , C21D6/004 , C21D6/005 , C21D9/08 , C21D9/50 , C21D2211/001 , C21D2211/004 , C21D2211/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/54
摘要： Provided is duplex stainless steel having high strength, SCC resistance and SSC resistance excellent in a high-temperature chloride environment, and capable of suppressing precipitation of a σ phase. The duplex stainless steel of the present embodiment includes, in mass %, of: C: at most 0.03%; Si: 0.2 to 1%; Mn: more than 5.0% to at most 10%; P: at most 0.040%; S: at most 0.010%; Ni: 4.5 to 8%; sol. Al: at most 0.040%; N: more than 0.2% to at most 0.4%; Cr: 24 to 29%; Mo: 0.5 to less than 1.5%; Cu: 1.5 to 3.5%; W: 0.05 to 0.2%; the balance being Fe and impurities, wherein the duplex stainless steel satisfies Formula (1): Cr+8Ni+Cu+Mo+W/2≥65 . . . (1), where a symbol of each element in Formula (1) represents a content of the element (in mass %).

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