WO2004040031A1 - 耐酸化性高Crフェライト系耐熱鋼の製造方法 - Google Patents
耐酸化性高Crフェライト系耐熱鋼の製造方法 Download PDFInfo
- Publication number
- WO2004040031A1 WO2004040031A1 PCT/JP2003/014066 JP0314066W WO2004040031A1 WO 2004040031 A1 WO2004040031 A1 WO 2004040031A1 JP 0314066 W JP0314066 W JP 0314066W WO 2004040031 A1 WO2004040031 A1 WO 2004040031A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- less
- oxidation
- steel
- resistant
- protective film
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Definitions
- the invention of this application relates to a method for producing a ferritic heat-resistant steel used under a high-temperature and low-oxygen partial-pressure atmosphere such as a thermal power boiler and a chemical industrial apparatus.
- Heat-resistant steel and heat-resistant alloys are used as materials that can withstand high temperatures and high pressures such as in thermal power plants, but when such heat-resistant steels or heat-resistant alloys are used in the atmosphere, the surface must be dense. A new oxide film is formed and functions as a protective layer.
- a Cr-containing heat-resistant steel or a heat-resistant alloy having a Cr content of 25 mass% or more exhibits excellent oxidation resistance because an oxidation-resistant protective film is formed even in a high-temperature steam atmosphere.
- a mechanical treatment such as shot pinning is performed to improve the surface of the base material or to improve the crystal grain size.
- a mechanical treatment such as shot pinning is performed to improve the surface of the base material or to improve the crystal grain size.
- Forms an oxidation-resistant protective film It is possible to do.
- the invention of this application has been made in view of the above circumstances, and solves the problems of the prior art, whereby an oxidation-resistant protective film is formed even under a low oxygen partial pressure atmosphere in high-temperature steam.
- the task is to provide high Cr ferrite heat-resistant steel. Disclosure of the invention
- the invention of this application provides the following inventions for solving the above problems.
- the invention of this application is, firstly, a ferritic heat-resistant steel having a Cr content of not more than 151 ⁇ 33%, and at least a region having a surface depth of 10 m is formed from elongated ferrite grains. It provides a steel with a protective structure on the surface that has a fine structure with a ferrite grain size of 3 m or less. It is. Secondly, a steel characterized in that the minor axis of the elongated ferrite grains is 5 im or less, and thirdly, the minor axis of the elongated ferrite grains is 3; Lim or less. Alternatively, the present invention provides steel having a ferrite particle size of 1 im or less.
- the invention of the present application is to perform processing in a range of 400 to 800, at least a region of the surface 10 forms a processed structure or a fine ferrite grain structure, and a preliminary oxidation treatment is performed.
- the present invention provides a method for producing a steel according to claims 1 to 3, which forms a protective film by performing the method.Fifth, a method for producing the steel having a true strain of 0.7 or more in true strain, and Sixth, there is provided a manufacturing method in which the pre-oxidation treatment is performed in an air atmosphere at a temperature of 400 to 800 ° C. for 30 minutes to 90 minutes.
- Figure 1 shows that after compression at a temperature of 500, a preliminary oxidation treatment of 640 X, / 1 h was performed in air, followed by steam oxidation of 650 O / 100 h.
- 7 is a SEM photograph of a cross section of a strongly processed portion after the process.
- Figure 2 shows that after compression working at a temperature of 500, after pre-oxidation at 640 ° C for 1 hour in air, and after steam oxidation at 650 for 100 hours.
- 6 is a SEM photograph of a cross section of a weakly processed portion of FIG.
- FIG. 3 is a cross-sectional SEM photograph of a strongly processed portion after performing steam oxidation of 650 ⁇ / 3 h without performing pre-oxidation treatment after compression working at a temperature of 500.
- the invention of this application is based on high Cr ferrite with a Cr content of 15 mass% or less in high-temperature steam or a low oxygen partial pressure atmosphere.
- the oxidation resistance of heat-resistant steels instead of increasing the composition of chromium (Cr) or gay (Si) or adding elements such as palladium (Pd) or platinum (Pt), It means that the oxidation resistance is improved by specific processing or heat treatment. For this reason, the high Cr ferritic heat-resistant steel obtained by the oxidation resistance improving method of the invention of this application has an advantage that physical properties and chemical properties inherent in the composition are not impaired.
- Oxidation-resistant protective films can be formed by relatively large grain refining treatments.However, such treatment is required for high Cr ferritic heat-resistant steels with a Cr content of 15 mass% or less. Even when used, an oxidation-resistant protective film is not formed. This is because if the Cr content is less than 15 mass%, the grain size is about 10 to 50; even if the grain is refined, a protective film mainly composed of Cr203 can be formed. This is because the necessary Cr cannot be diffused sufficiently and uniformly. Therefore, an oxidation-resistant protective film cannot be formed in high-temperature steam.
- the most important thing in the invention of this application is to perform high-temperature warm working on high Cr ferritic heat-resistant steel to accumulate strain energy to a high degree, or to obtain a microstructure with a crystal grain size of 2 m or less. Is to be formed.
- the reason that the strain energy in the invention of this application is highly accumulated or a microstructure having a crystal grain size of 3 or less is formed is that the steel material in which the strain energy is highly accumulated is easily recrystallized and the ultrafine grain structure is formed. It is formed. And, with the formation of this ultrafine grain structure, the grain boundary area increases,
- a strain rate of 0.1 lsec-1 or more and a processing rate (cross-sectional reduction rate) of 70% or more are required. It is desirable to perform a warm working process. If the processing rate is less than 70%, the required strain energy is not sufficiently accumulated, and the formation and use of the protective film after the pre-oxidation treatment cannot be expected much.
- the warm warm working is preferably performed in a temperature range of 400 to 800.
- strain By forming strain under such conditions, elongated ferrite grains or fine particles can be generated.
- the minor axis is 5 m or less, particularly preferably the minor axis is 3 m or less, or the ferrite grains have a grain size of 3 m or less, particularly preferably 1 m or less.
- the following fine particles are 5 m or less, particularly preferably the minor axis is 3 m or less, or the ferrite grains have a grain size of 3 m or less, particularly preferably 1 m or less. The following fine particles.
- the invention of this application is to perform high-strength working on a high Cr ferritic heat-resistant steel to accumulate strain energy to a high degree, or to form a microstructure with a crystal grain size of 3 / ⁇ m or less.
- the pre-oxidation treatment is preferably performed in an air atmosphere or an inert gas atmosphere containing an oxygen gas (a rare gas or a nitrogen gas), but it is more practical to use the air atmosphere.
- a heat treatment of about 400 to 90 minutes at 400 T: 800 in this air atmosphere may be performed. preferable. '
- the first chromium (Cr) is oxidation, Cr 2 ⁇ 3 functioning as oxidation-resistant protective film is formed.
- the relationship between the heating temperature and the average crystal grain size in the pre-oxidation treatment was 660 in the air atmosphere and 0.8 m or less for the heating and holding samples below. It has been confirmed that the length is 1 to 2 m in the retained sample.
- the high-Cr ferritic heat-resistant steel to which the invention of this application is applied includes those having various compositions in which Cr is contained at 15 mass% or less. Contains 5 mass%.
- Steels include, for example, high Cr ferritic heat resistant steels specified in ASME SA335 P91 or ASME SA 213 T91. Collectively, in the invention of this application, it is defined as a high ferrite “system”.
- Mod. 9 Cr-1 Mo steel is subjected to 70% compression processing at 500 and then cut and polished so that the microstructure region and the processed structure region are exposed on the surface.
- Fig. 1 shows a cross-sectional SEM photograph of the heavily worked portion after steam oxidation of 650/100 h.
- the grain size of the ferrite grains in the microstructure region under the protective film was 1.0 m or less.
- the short diameter of the elongated ferrite in the processed structure region under the protective film was 3 m.
- Mod. 9 Cr-1 Mo steel was pre-oxidized in air at 680 ⁇ for 1 h and then steam-oxidized at 650 in Z100 h.
- Figure 2 shows a cross-sectional SEM photograph of the Fe-rich two-layer scale (about 60 m thick) grown by accelerated oxidation. The average grain size of ferrite grains is 7 im.
- the invention of this application makes it possible to form a thin, highly-adhesive antioxidant film on a high-Cr ferrite steel with a Cr content of 15% or less, which was previously impossible. .
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60325995T DE60325995D1 (de) | 2002-11-01 | 2003-11-04 | VERFAHREN ZUR HERSTELLUNG VON OXIDATIONSBESTÄNDIGEM Cr-REICHEM FERRITISCHEM HITZEBESTÄNDIGEM STAHL |
KR1020047013060A KR100619158B1 (ko) | 2002-11-01 | 2003-11-04 | 내산화성 고크롬 페라이트계 내열강과 그의 제조방법 |
EP03770135A EP1557477B1 (en) | 2002-11-01 | 2003-11-04 | METHOD FOR PRODUCING OXIDATION-RESISTANT HIGH Cr FERRITIC HEAT RESISTANT STEEL |
US10/501,152 US20040250923A1 (en) | 2002-11-01 | 2003-11-04 | Method for producing oxidation-resistant high cr ferritic heat resistant steel |
DK03770135T DK1557477T3 (da) | 2002-11-01 | 2003-11-04 | Fremgangsmåde til fremstilling af oxidationbestandig höj-Cr ferritisk varmebestandigt stål |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-320568 | 2002-11-01 | ||
JP2002320568A JP4253719B2 (ja) | 2002-11-01 | 2002-11-01 | 耐酸化性高Crフェライト系耐熱鋼の製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004040031A1 true WO2004040031A1 (ja) | 2004-05-13 |
Family
ID=32211858
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/014066 WO2004040031A1 (ja) | 2002-11-01 | 2003-11-04 | 耐酸化性高Crフェライト系耐熱鋼の製造方法 |
Country Status (8)
Country | Link |
---|---|
US (1) | US20040250923A1 (ja) |
EP (1) | EP1557477B1 (ja) |
JP (1) | JP4253719B2 (ja) |
KR (1) | KR100619158B1 (ja) |
CN (1) | CN1329543C (ja) |
DE (1) | DE60325995D1 (ja) |
DK (1) | DK1557477T3 (ja) |
WO (1) | WO2004040031A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9847520B1 (en) * | 2012-07-19 | 2017-12-19 | Bloom Energy Corporation | Thermal processing of interconnects |
DE102018217284A1 (de) * | 2018-10-10 | 2020-04-16 | Siemens Aktiengesellschaft | Verbesserung des Niedertemperatur-Oxidationswiderstands von Chromstahl, Bauteil und Verfahren |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07268554A (ja) * | 1994-03-28 | 1995-10-17 | Nippon Steel Corp | 成形加工性および耐熱性の優れた自動車排気系用フェライト系ステンレス鋼板 |
JPH09143611A (ja) * | 1995-11-21 | 1997-06-03 | Nippon Steel Corp | 成形性及び疲労特性に優れた耐熱軟化性を有する熱延 高強度鋼板 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4331474A (en) * | 1980-09-24 | 1982-05-25 | Armco Inc. | Ferritic stainless steel having toughness and weldability |
DE69827729T2 (de) * | 1997-09-22 | 2005-04-28 | National Research Institute For Metals | Ferritischer,wärmebeständiger Stahl und Verfahren zur Herstellung |
KR100536828B1 (ko) * | 1997-09-22 | 2006-02-28 | 카가쿠기쥬쯔죠 킨조쿠자이료 기쥬쯔켄큐죠 | 미세페라이트주체조직강과그제조방법 |
JP4221518B2 (ja) * | 1998-08-31 | 2009-02-12 | 独立行政法人物質・材料研究機構 | フェライト系耐熱鋼 |
JP4355782B2 (ja) * | 1999-02-26 | 2009-11-04 | 独立行政法人物質・材料研究機構 | 耐酸化性の改善されたフェライト系耐熱鋼 |
JP2001192730A (ja) * | 2000-01-11 | 2001-07-17 | Natl Research Inst For Metals Ministry Of Education Culture Sports Science & Technology | 高Crフェライト系耐熱鋼およびその熱処理方法 |
CN1482648A (zh) * | 2000-03-02 | 2004-03-17 | 住友金属工业株式会社 | 彩色显象管荫罩框及框架构件 |
DE60200326T2 (de) * | 2001-01-18 | 2005-03-17 | Jfe Steel Corp. | Ferritisches rostfreies Stahlblech mit hervorragender Verformbarkeit und Verfahren zu dessen Herstellung |
-
2002
- 2002-11-01 JP JP2002320568A patent/JP4253719B2/ja not_active Expired - Lifetime
-
2003
- 2003-11-04 WO PCT/JP2003/014066 patent/WO2004040031A1/ja active Application Filing
- 2003-11-04 CN CNB2003801001783A patent/CN1329543C/zh not_active Expired - Fee Related
- 2003-11-04 US US10/501,152 patent/US20040250923A1/en not_active Abandoned
- 2003-11-04 EP EP03770135A patent/EP1557477B1/en not_active Expired - Fee Related
- 2003-11-04 DK DK03770135T patent/DK1557477T3/da active
- 2003-11-04 KR KR1020047013060A patent/KR100619158B1/ko not_active IP Right Cessation
- 2003-11-04 DE DE60325995T patent/DE60325995D1/de not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07268554A (ja) * | 1994-03-28 | 1995-10-17 | Nippon Steel Corp | 成形加工性および耐熱性の優れた自動車排気系用フェライト系ステンレス鋼板 |
JPH09143611A (ja) * | 1995-11-21 | 1997-06-03 | Nippon Steel Corp | 成形性及び疲労特性に優れた耐熱軟化性を有する熱延 高強度鋼板 |
Non-Patent Citations (1)
Title |
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See also references of EP1557477A4 * |
Also Published As
Publication number | Publication date |
---|---|
DK1557477T3 (da) | 2009-05-18 |
EP1557477B1 (en) | 2009-01-21 |
EP1557477A4 (en) | 2006-05-03 |
CN1692171A (zh) | 2005-11-02 |
JP4253719B2 (ja) | 2009-04-15 |
EP1557477A1 (en) | 2005-07-27 |
KR100619158B1 (ko) | 2006-08-31 |
US20040250923A1 (en) | 2004-12-16 |
KR20040089657A (ko) | 2004-10-21 |
DE60325995D1 (de) | 2009-03-12 |
CN1329543C (zh) | 2007-08-01 |
JP2004156075A (ja) | 2004-06-03 |
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