WO2002090610A1 - Acier ferritique resistant aux hautes temperatures - Google Patents
Acier ferritique resistant aux hautes temperatures Download PDFInfo
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- WO2002090610A1 WO2002090610A1 PCT/JP2002/004446 JP0204446W WO02090610A1 WO 2002090610 A1 WO2002090610 A1 WO 2002090610A1 JP 0204446 W JP0204446 W JP 0204446W WO 02090610 A1 WO02090610 A1 WO 02090610A1
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- 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
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- 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- 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
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- 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
- C21D2211/004—Dispersions; Precipitations
Definitions
- the present invention relates to a ferritic heat-resistant steel having a small softening of a heat affected zone of a weld. ⁇ Ming
- High-temperature materials used in heat-resistant and pressure-resistant piping such as poilers and chemical equipment are low Cr ferrite steels represented by 2 'l / 4Cr-IMo steels and high Cr fillers represented by 9Cr-IMo steels Steel and austenitic stainless steel represented by 18Cr-8Ni steel.
- high Cr ferritic steel has better strength and corrosion resistance in the temperature range of 500 to 600 ° C than low Cr ferritic steel.
- high Cr ferritic steel is less expensive and has better resistance to stress corrosion cracking than austenitic stainless steel.
- high Cr ferritic steel has a small coefficient of thermal expansion and a small strain with temperature change.
- high Cr ferritic steel is widely used because of its many advantages as a material for high temperatures. In recent years, as the operating environment has become more severe, the requirements for the performance required for ferritic heat-resistant steel, especially for the cleave strength, have become more severe.
- ferritic heat-resistant steels and heat treatment methods have been proposed (for example, JP-A-2-310340, JP-A-4-6213, JP-A-4-350118, JP-A-4-354856, JP-A-5-263196, JP-A-5_311342) Nos. To 311346, see).
- ferritic heat-resistant steel is used as a welded structure, for example, as shown in "Science and Technology of Welding and Joining, 1996, Vol. 1, o. 1, p. 36-42”
- HZ softening phenomenon occurs in which the creep strength of the weld heat affected zone (HAZ) of a welded joint decreases by more than 20%.
- the ferritic heat-resistant steel disclosed in each of the above publications mainly aims to improve the creep strength and toughness of the base metal, and does not consider the decrease in the creep strength of the welded joint due to the HAZ softening phenomenon. Absent.
- ferritic steels and the manufacturing methods described in each of these publications require special melting and working heat treatment as disclosed in, for example, JP-A-7-242935 and JP-A-8-337813. Therefore, there is a problem that the production cost is increased and the production efficiency is reduced. Also, those disclosed in JP-A-6-65689, JP-A-8-85848 and JP-A-9-71845 include expensive elements such as oxidized Ta particles, Ta, Nd, and Hf as essential components. There are problems such as an increase in manufacturing costs. Disclosure of the invention
- An object of the present invention is to provide a heat-resistant steel which does not require special melting and working heat treatment and which does not necessarily need to add expensive oxide Ta particles, Ta, Nd, Hf and the like. It is an object of the present invention to provide an inexpensive ferritic heat-resistant steel that has a small decrease in the cleave strength in the heat affected zone of the weld.
- the ferritic heat-resistant steel of the present invention is characterized by the following (A) and (B).
- the balance shall be Fe or impurities.
- the ferritic heat-resistant steel of the present invention comprises at least one component selected from at least one of the following first to fifth groups instead of part of Fe in the above (A). May be included.
- Group 1 at a mass 0/0, a total of 0.:! ⁇ 5.0% Mo and ⁇ ⁇ ⁇ .
- Group 2 Cu, Ni and Co in mass%, total 0.02-5.00%.
- Group 3 Ta, Hf, Nd and Ti in mass%, totaling 0.01-0.20%.
- Group 4 In mass%, a total of 0.0005-0.0100% 0 & 8 .
- Group 5 mass 0/0, 0.0005 to 0.0100% of B.
- the inventors have repeated experiments and examinations focusing on the structural change due to the heat cycle during welding, and as a result, have obtained the following new findings and completed the present invention.
- M 23 C 6 type carbides in a large amount solid solution of Cr is coarse in comparison with the MX type carbonitrides, by heat cycle during welding, a solid solution in Matorittasu that partially decomposes, in subsequent heat treatment (post-welding heat treatment) and creep early stage, from the region of the matrix portion of the M 23 C 6 type carbide is solid-solved, Cr was dissolved in supersaturation again finely precipitated.
- the base material that does not undergo the welding heat cycle (the solid solution of the carbide does not partially occur) or the portion where the HAZ softening does not occur (the Or no portion dissolution of things, or the carbides compared to completely decompose solid solution), precipitation density of the M 23 C 6 type carbide mainly composed of Cr in HAZ, size is not uniform. Thereafter, during use, the precipitation of the Cr dissolved in the supersaturation was completed, and after the Cr concentration of the mother phase reached the equilibrium concentration, the fine particles disappeared and the particles became coarse.
- the heat-resistant flat steel of the present invention is characterized by satisfying the above (A) and (B).
- the chemical composition of M 23 C 6 type carbide mainly MX type The reason for specifying the size and precipitation density of carbonitride of type MX is as follows. In the following, “%” means “% by mass”.
- C is formed the M 23 C 6 type carbide, has been that there contributing original prime to secure the high temperature strength.
- M 23 C e-type carbides the size by as described above, dissolved in part by welding, re-precipitated by subsequent heat treatment
- Contact Yopi creep initial stage a coarse M 23 C 6 type carbide causes HAZ softening. Therefore, to reduce the amount of precipitation of M 23 C 6 type carbides before welding, to ensure the long strength of HAZ, ie, C content in order to prevent the HAZ softening effective reduced as much as possible Therefore, the C content should be less than 0.05%. Preferred is 0.045% or less.
- the lower limit is not specified.
- C forms an MX-type carbonitride, and is also an effective element for obtaining the effect of strengthening its fine dispersion, and its effect can be obtained at 0.001% or more. 1% or more may be contained.
- Si 1.0% or less Si is added as a deoxidizer during steelmaking. Si is also an element that improves oxidation resistance and hot corrosion resistance. However, excessive addition causes a decrease in creep embrittlement and toughness. For this reason, the Si content was set to 1.0% or less. Preferred is 0.8% or less. It should be noted that, when Si is sufficiently deoxidized by Mn or A1, which will be described later, it is not always necessary to positively add Si, so the lower limit of the Si content is not particularly defined. However, in order to surely obtain the deoxidizing effect of Si, it is desirable to contain 0.03% or more.
- Mn is added as a deoxidizing agent at the time of steel making, as in the case of Si described above.
- Mn is an austenite-forming element and an effective element for obtaining a martensitic structure.
- the Mn content was set to 2.0% or less. It is preferably 1.8% or less.
- the lower limit is not particularly defined. However, in order to reliably obtain the deoxidizing effect of Mn, it is preferable to contain 0.03% or more.
- P is an impurity element contained in steel, and if it is contained excessively, it causes grain boundary embrittlement. Therefore, the upper limit was set to 0.030%. The lower the P content, the better.
- S is an impurity element contained in steel. If it is contained excessively, it causes grain boundary embrittlement. Therefore, the upper limit was set to 0.015%. The lower the S content, the better.
- Cr is an element that is effective for ensuring high-temperature oxidation resistance, high-temperature corrosion resistance, and high-temperature strength. To achieve these effects, a content of 7% or more is required. is there. However, excessive addition causes increase the production amount of M 2 3 C 6 type carbide mainly composed of Cr, promotes the growth rate of carbides, lowering the tally up strength in HAZ. For this reason, the upper limit of the Cr content was set to 14%. Preferred is 8 to: 13%.
- V 0.05 to 0.40%
- V is an element that forms a fine and stable MX-type carbonitride even at high temperatures and contributes to the improvement of creep strength. To obtain this effect, a content of 0.05% or more is required. However, if the content exceeds 0.40%, the MX-type carbonitrides will be coarsened, and the effect of improving the strength by the fine dispersion will be lost at an early stage, and the toughness will be reduced. Therefore, the upper limit of the V content is set to 0.40%. Preferred is 0.10 to 0.30%.
- Nb forms fine and stable MX-type carbonitrides even at high temperatures, similar to V described above, and contributes to improvement in creep strength.
- a content of 0.01% or more is required.
- the upper limit of the Nb content is set to 0.10%. Preferred is 0.02 to 0.08%.
- N 0.001% or more and less than 0.050%
- N in the same manner as mentioned above and C, have the effect of lowering the activity of Cr, and promotes the precipitation of M 2 3 C 6 type carbide, promotes HAZ softening. Therefore, since it is effective to reduce N as much as possible, the upper limit of the N content is set to less than 0.050%.
- N forms an MX-type carbonitride in which V and Nb form a solid solution, and is also an element that exerts the effect of strengthening its fine dispersion.To achieve this effect, a content of 0.001% or more is required It is. For these reasons, the N content is set at 0.001% or more and less than 0.050%. Preferred is 0.003 to 0.045%.
- sol. A1 0.010% or less Al is added as a deoxidizer during steelmaking, but excessive addition causes a decrease in cleanliness. For this reason, the content of A1 was set at 0.010% or less in sol. A1 content. Preferred is 0.008% or less. It should be noted that when A1 is sufficiently deoxidized by Si or Mn, the lower limit of the content of A1 is not particularly defined because it is not always necessary to actively add A1. However, in order to reliably obtain the deoxidizing effect of A1, it is desirable that the sol.Al content be 0.003% or more.
- o (Oxygen) is an impurity element contained in steel. If it is contained excessively, it causes a decrease in cleanliness and a decrease in creep strength. Therefore, the O content was set to 0.010% or less. o The lower the content, the better.
- the substance is substantially Fe. However, if necessary, the following components may be added instead of part of Fe.
- these elements do not necessarily need to be positively added. If added, all elements strengthen the matrix by solid solution and precipitate as intermetallic compounds, contributing to the improvement in creep strength. Therefore, if it is desired to obtain the effect, one or more kinds may be added positively, and the effect becomes remarkable at a total content of 0.1% or more. However, if the total content exceeds 5.0%, the amount of coarse intermetallic compounds increases, leading to a decrease in toughness. Therefore, the content of these elements when added is preferably 0.1 to 5.0% in total. Preferred is a total of 0.5-4.5%.
- these elements do not necessarily need to be positively added. If added, all elements are austenite-forming elements, contributing to the formation of martensite in the matrix. Therefore, if it is desired to obtain the effect, one or more kinds may be added positively, and the effect is 0.02% or less in total. It becomes remarkable at the above content. However, if the total content exceeds 5.00%, the creep ductility is significantly reduced. Therefore, the content of these elements when added is preferably 0.02 to 5.00% in total. Preferred is a total of 0.05 to 4.50%.
- any of the elements like V and Nb described above, form MX-type carbides and contribute to the improvement of creep strength. Therefore, if it is desired to obtain the effect, one or more kinds may be added positively, and the effect becomes remarkable at a total content of 0.01% or more.
- the total content exceeds 0.20%, coarsening of carbides and deterioration of cleanliness of steel are caused, and toughness is impaired. Therefore, the content of these elements when added is 0.0 :! It is better to set it to 0.20%. Preferred is a total of 0.03 to 0.18%.
- these elements do not necessarily need to be positively added. When added, all elements improve hot workability. Therefore, if it is desired to obtain the effect, one or more kinds may be added positively, and the effect becomes remarkable at a total content of 0.0005% or more. However, if the total content exceeds 0.000%, the cleanliness of the steel is impaired. Therefore, the content of these elements when added is preferably 0.0005 to 0.0100% in total. Preferred is a total of 0.0010 to 0.0080%.
- B need not always be added positively. When added, it disperses and stabilizes carbides, contributing to the improvement of the creep strength of the base material. B is also an element that improves hardenability, and is effective in changing the structure of the base metal to a martensite structure. Therefore, if it is desired to obtain these effects, they may be added positively, and the effect is apparent at a content of 0.0005% or more. Become an author. However, if the content exceeds 0.0100%, the hot cracking resistance during welding is impaired. Therefore, when added, the B content should be 0.0005 to 0.0100%. Preferred is 0.0010-0.0080%.
- the particle diameter (major axis) force SO.3 precipitation density of carbides and MX type carbonitride or more M 23 C 6 type mainly tni is 1 X10 6 cells / negation 2 following tissue manufacturing the preform Concrete
- the temperature and holding time of the "normalizing” or “normalizing + tempering” heat treatment are appropriately adjusted according to the chemical composition of the steel (for example, the conditions described in the examples described later are employed). This can be achieved by:
- a 12-mm-thick steel plate made of 34 types of ferritic steels having the chemical compositions shown in Tables 1 and 2 was prepared.
- the steel sheet is melted in a vacuum melting furnace.
- one side of the steel sheet is cut with a groove with an angle of 30 ° and a root face thickness of l mm, butted, and then multi-layer welded by TIG welding using the same filler metal as the steel sheet.
- welded joints were manufactured for each steel sheet.
- Weld heat input was 12-20 kJ / cm, and preheating and interpass temperature control were not particularly performed.However, weld defects such as high-temperature cracks and low-temperature cracks were not found in any of the welded joints after welding. Not at all.
- the filler metal was manufactured by subjecting each prepared steel plate to hot working and mechanical working.
- the manufactured welded joint was subjected to a post-weld heat treatment at 740 ° C for 0.5 hours, and then a creep test specimen was taken from the welded portion and subjected to a creep test.
- V-notch test specimens specified in JIS Z 2202 were collected from the welds and subjected to a Charpy impact test. The creep test specimen was sampled so that the weld line was located at the center in the longitudinal direction. V-notch specimens were collected so that the melting boundary was located at the notch bottom.
- the creep test was performed at 650 ° C, the obtained data was deviated from a straight line to obtain an estimated strength of 3000 hours, the strength of the base metal and the strength of the welded joint were compared, and the strength of the welded joint was 90% or more of the base metal. Were evaluated as acceptable and less than 90% as unacceptable.
- the Charpy impact test was performed at 120 ° C, the absorbed energy was determined, and those having an absorbed energy of 40 J or more were evaluated as passing.
- MPa Mark Estimated creep strength
- the chemical composition but is within the range specified in the present invention, inadequate heat treatment during steel concrete, the particle size is 0. 3; xm of more M 2 3 C 6 type mainly carbides and MX
- the welded joints with marks 10-: 13 obtained using steel sheets with the precipitation density of the carbonitride of the mold outside the range specified in the present invention have an estimated strength of 65-72% of the strength of the base metal, HAZ softening is remarkable.
- the ferritic heat-resistant steel of the present invention has a small decrease in creep strength in the heat affected zone. Therefore, it is useful as a constituent material for welding structures such as poilers.
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Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02724710A EP1304394B1 (en) | 2001-05-09 | 2002-05-07 | Ferritic heat-resistant steel |
KR10-2003-7000133A KR100510979B1 (ko) | 2001-05-09 | 2002-05-07 | 페라이트계 내열강 |
DE60203865T DE60203865T2 (de) | 2001-05-09 | 2002-05-07 | Ferritischer wärmebeständiger stahl |
US10/358,330 US6712913B2 (en) | 2001-05-09 | 2003-02-05 | Ferritic heat-resisting steel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001138624A JP4023106B2 (ja) | 2001-05-09 | 2001-05-09 | 溶接熱影響部軟化の小さいフェライト系耐熱鋼 |
JP2001-138624 | 2001-05-09 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/358,330 Continuation US6712913B2 (en) | 2001-05-09 | 2003-02-05 | Ferritic heat-resisting steel |
Publications (1)
Publication Number | Publication Date |
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WO2002090610A1 true WO2002090610A1 (fr) | 2002-11-14 |
Family
ID=18985530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/004446 WO2002090610A1 (fr) | 2001-05-09 | 2002-05-07 | Acier ferritique resistant aux hautes temperatures |
Country Status (7)
Country | Link |
---|---|
US (1) | US6712913B2 (ja) |
EP (1) | EP1304394B1 (ja) |
JP (1) | JP4023106B2 (ja) |
KR (1) | KR100510979B1 (ja) |
CN (1) | CN1189582C (ja) |
DE (1) | DE60203865T2 (ja) |
WO (1) | WO2002090610A1 (ja) |
Cited By (2)
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CN104046917A (zh) * | 2013-03-13 | 2014-09-17 | 香港城市大学 | 富Cu纳米团簇强化的超高强度铁素体钢及其制造方法 |
WO2014139451A1 (zh) * | 2013-03-13 | 2014-09-18 | 香港城市大学 | 纳米金属间化合物强化的超高强度铁素体钢及其制造方法 |
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JP4836063B2 (ja) * | 2001-04-19 | 2011-12-14 | 独立行政法人物質・材料研究機構 | フェライト系耐熱鋼とその製造方法 |
JP4564245B2 (ja) * | 2003-07-25 | 2010-10-20 | 新日本製鐵株式会社 | 溶接金属の低温割れ性に優れた超高強度溶接継手及び高強度溶接鋼管の製造方法 |
JP4509664B2 (ja) | 2003-07-30 | 2010-07-21 | 株式会社東芝 | 蒸気タービン発電設備 |
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- 2002-05-07 KR KR10-2003-7000133A patent/KR100510979B1/ko active IP Right Grant
- 2002-05-07 DE DE60203865T patent/DE60203865T2/de not_active Expired - Lifetime
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CN104046917A (zh) * | 2013-03-13 | 2014-09-17 | 香港城市大学 | 富Cu纳米团簇强化的超高强度铁素体钢及其制造方法 |
WO2014139453A1 (zh) * | 2013-03-13 | 2014-09-18 | 香港城市大学 | 富Cu纳米团簇强化的超高强度铁素体钢及其制造方法 |
WO2014139451A1 (zh) * | 2013-03-13 | 2014-09-18 | 香港城市大学 | 纳米金属间化合物强化的超高强度铁素体钢及其制造方法 |
Also Published As
Publication number | Publication date |
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JP2002332547A (ja) | 2002-11-22 |
EP1304394B1 (en) | 2005-04-27 |
CN1189582C (zh) | 2005-02-16 |
KR20030011148A (ko) | 2003-02-06 |
EP1304394A4 (en) | 2004-08-18 |
KR100510979B1 (ko) | 2005-08-30 |
US6712913B2 (en) | 2004-03-30 |
JP4023106B2 (ja) | 2007-12-19 |
CN1462316A (zh) | 2003-12-17 |
EP1304394A1 (en) | 2003-04-23 |
US20030140986A1 (en) | 2003-07-31 |
DE60203865T2 (de) | 2006-05-24 |
DE60203865D1 (de) | 2005-06-02 |
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