WO2004015160A1 - 窒素吸収処理によるステンレス鋼製製品の製造方法とこれにより得られるステンレス製鋼製品 - Google Patents
窒素吸収処理によるステンレス鋼製製品の製造方法とこれにより得られるステンレス製鋼製品 Download PDFInfo
- Publication number
- WO2004015160A1 WO2004015160A1 PCT/JP2003/010164 JP0310164W WO2004015160A1 WO 2004015160 A1 WO2004015160 A1 WO 2004015160A1 JP 0310164 W JP0310164 W JP 0310164W WO 2004015160 A1 WO2004015160 A1 WO 2004015160A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stainless steel
- product
- steel product
- nitrogen
- absorption treatment
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0257—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
-
- 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
- C21D2211/001—Austenite
-
- 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 stainless steel product by a nitrogen absorption treatment and a stainless steel product obtained by the method. More specifically, the invention of this application has characteristics that can sufficiently suppress the processing cost of austenitic stainless steel, which is a difficult-to-work material, and can sufficiently satisfy both strength and corrosion resistance.
- the present invention relates to a method for producing a stainless steel product by a nitrogen absorption treatment capable of producing a stainless steel product, and a stainless steel product obtained by the method. Background art
- Austenitic stainless steel is a difficult-to-machine material, and therefore it is difficult to machine into the desired shape, leading to higher machining costs. Since austenitic stainless steel is excellent in both corrosion resistance and strength, it is desirable to provide inexpensively products with desired shapes and complicated shapes.
- powder metallurgy attempts have been made to absorb nitrogen during sintering.However, large-scale equipment is required to manufacture products formed by powder metallurgy, and the size of products that can be manufactured is large. There are restrictions on the sheath shape.
- products obtained by powder metallurgy have numerous pores called pores, which are reflected in the mechanical properties of the product and have problems in mechanical reliability.
- the bulk material produced by smelting is not subjected to nitrogen absorption treatment.
- the invention of this application has been made in view of such circumstances, and it is possible to sufficiently reduce the processing cost of austenitic stainless steel, which is a difficult-to-process material, and to have sufficient strength and corrosion resistance.
- An issue to be solved is to provide a method for producing stainless steel products by nitrogen absorption treatment and to provide stainless steel products obtained by the process, which enables the production of stainless steel products having characteristics that satisfy the requirements. . Disclosure of the invention
- a ferrite-type stainless steel, a molten product that is melted and processed into a desired shape is manufactured by using an inert gas containing nitrogen gas and an inert gas containing 800.
- a method of manufacturing a stainless steel product by nitrogen absorption characterized in that the entire product is austenitized or a part is austenitized to form a two-phase structure of ferrite and austenite by contacting as described above. Item 1) is provided.
- the invention of this application is made of a fluorine-type stainless steel, and nitrogen is added by an inert gas containing nitrogen gas to a bulk product that is melted and processed into a desired shape, and the entire product is austenitic.
- the present invention provides a stainless steel product (claim 2) characterized in that:
- the invention of this application is made of ferritic stainless steel, and is added to an inactive gas containing nitrogen gas to a pulp-like product that is melted and processed into a desired shape, and a part of the product is obtained.
- the invention also provides a stainless steel product (Claim 3) characterized in that it is austenitic and has a two-phase structure of ferrite and austenite.
- FIG. 1 is a photograph instead of a drawing showing a lump of 3.5 kg of a flaky stainless steel (Fe-24 mass Cr-2 mass Mo) smelted using a vacuum arc melting furnace in the example.
- FIG. 2 is a photograph replacing a drawing showing a round bar produced by hot and cold forging from the lump shown in FIG.
- FIG. 3 is a photograph replacing a drawing showing a sheet material produced by hot and cold forging from the lump shown in FIG.
- FIG. 4 is a plan view showing a round bar tensile test piece manufactured from the round bar material shown in FIG.
- Figures 5 (a) and 5 (b) are the X-ray diffraction patterns of the test piece after the nitrogen absorption treatment and the equivalent test piece without the nitrogen absorption treatment, respectively.
- Fig. 6 is a correlation diagram showing the balance between strength and ductility of the test piece, the existing alloy, and a test piece equivalent without nitrogen absorption treatment.
- Figures 7 (a), (b), (c), and (d) show the test pieces, 316L stainless steel, and nitrogen absorption in 0.93 ⁇ 4NaCl solution, PBS (-) solution, Hanks solution, and Eagle's MEM solution, respectively.
- 3 is a polarization curve showing the results of a polarization test in which a test piece equivalent was immersed and its corrosion resistance was evaluated.
- 8 (a) and 8 (b) are optical micrographs of the surface of the test piece and the surface of 316L stainless steel, respectively, after the polarization test in Eagle's MEM solution.
- a pulp-like product made of ferritic stainless steel which is melted and processed into a desired shape, is treated with nitrogen gas.
- an inert gas containing at least 800 to austenite the entire product or partially austenite to form a two-phase structure of ferrite and austenite.
- a bulk product processed to a desired shape is The above method of contacting with an active gas at 800 or more belongs to the nitrogen absorption treatment classified as the so-called solid phase absorption method, in which the product is heated to 800 or more in an inert gas atmosphere containing nitrogen gas. As a result, nitrogen is added to all or part of the product.
- the stainless steel product of the invention of the present application obtained in this manner is a product in which the entire product is austenitized, or a part of the product is austenitized, and has a two-phase structure of ferrite and austenite. For this reason, the stainless steel product of the invention of the present application has both excellent corrosion resistance and strength, and even if it is a stainless steel product having a complicated shape, the processing cost is kept low and an inexpensive product is obtained. It has the advantage of being The above effect can be sufficiently obtained if the amount of nitrogen added to the ferritic stainless steel bulk product is approximately 0.5% by mass or more.
- a vacuum arc melting furnace 3.5 kg of ferrous stainless steel (Fe-24 mass% Cr-2 mass% Mo) lump as shown in Fig. 1 was produced.
- This ingot is divided into four pieces, cut into blocks of 25 min x 25 miii x 110 mm, hot forged at 1100 and cold forged at room temperature, and the diameter as shown in Figs. 2 and 3 respectively.
- a round bar of 9 mm ⁇ 90 thighs, a plate of 1.5 mix 15 face ⁇ 15 mm thick was prepared.
- a round bar tensile test piece having the planar shape shown in FIG. 4 was produced by machining.
- test piece was placed on a SUS304 mesh board and acetone After degreasing and washing in, it was inserted and placed in the nitrogen section of the material nitrogen apparatus, and evacuated to 2 Pa with a rotary pump. Then, an inert gas containing nitrogen gas was introduced into the nitrogenation section at a flow rate of 2 liters / min, and the temperature of the nitrogenation section was increased from room temperature to 1200 T at a rate of 5 /] iiin. For 24 hours.
- Figure 5 (a) shows the obtained X-ray diffraction pattern.
- Fig. 5 (b) shows the X-ray diffraction pattern of a test piece equivalent without nitrogen absorption treatment. As is clear from the comparison of Fig. 5 (a) and (b), it is confirmed that the test piece after the nitrogen absorption treatment is completely austenitic stainless steel. The amount of nitrogen added was approximately 0.9% by mass.
- Figure 6 shows the balance between the strength and ductility of the test piece after the nitrogen absorption treatment, the equivalent test piece without the nitrogen absorption treatment, and the existing alloy. As can be seen from Fig. 6, when nitrogen absorption treatment is performed, the strength and ductility balance are superior to those of existing alloys and test specimens that have not been subjected to nitrogen absorption treatment. The effectiveness of the nitrogen absorption treatment is confirmed.
- test pieces were evaluated for corrosion resistance.
- Figures 7 (a) to 7 (d) are polarization curves that are the results of polarization tests performed to evaluate corrosion resistance. As can be seen from Figs. 7 (a) to (d), the test pieces subjected to nitrogen absorption treatment for all test solutions were compared with 316L stainless steel and the equivalent test pieces without nitrogen absorption treatment. Excellent corrosion resistance As shown in FIG. 8 (a), no pitting was observed. Pitting occurred on the 316L stainless steel as shown in Fig. 8 (b).
- austenitic stainless steel which is a difficult-to-work material, has a desired shape, can keep the applied cost sufficiently low, and has both strength and corrosion resistance.
- a stainless steel product and a method for producing the same having characteristics that can be sufficiently satisfied are provided.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/523,678 US20060037669A1 (en) | 2002-08-08 | 2003-08-08 | Method for manufacturing stainless steel product by nitrogen absorption treatment and stainless steel product produced by the method |
EP03784626A EP1533395A4 (en) | 2002-08-08 | 2003-08-08 | METHOD FOR MANUFACTURING A STAINLESS STEEL PRODUCT BY NITROGEN ABSORPTION TREATMENT AND STAINLESS STEEL PRODUCT OBTAINED ACCORDING TO SAID PROCESS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-231557 | 2002-08-08 | ||
JP2002231557A JP4009716B2 (ja) | 2002-08-08 | 2002-08-08 | 窒素吸収処理によるステンレス鋼製製品の製造方法とこれにより得られるステンレス鋼製製品 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004015160A1 true WO2004015160A1 (ja) | 2004-02-19 |
Family
ID=31711750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/010164 WO2004015160A1 (ja) | 2002-08-08 | 2003-08-08 | 窒素吸収処理によるステンレス鋼製製品の製造方法とこれにより得られるステンレス製鋼製品 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060037669A1 (ja) |
EP (1) | EP1533395A4 (ja) |
JP (1) | JP4009716B2 (ja) |
WO (1) | WO2004015160A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023189142A1 (ja) * | 2022-03-28 | 2023-10-05 | 日鉄ケミカル&マテリアル株式会社 | 電磁波シールド材 |
Families Citing this family (17)
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JP4336784B2 (ja) * | 2002-11-21 | 2009-09-30 | 独立行政法人物質・材料研究機構 | 生体軟組織用医療用具とその製造方法 |
JP4378773B2 (ja) | 2005-05-16 | 2009-12-09 | 独立行政法人物質・材料研究機構 | ステンレス鋼製製品の製造方法とそのステンレス鋼製製品 |
WO2006134541A1 (en) * | 2005-06-15 | 2006-12-21 | Koninklijke Philips Electronics N.V. | Method for manufacturing a stainless steel product |
JP5212602B2 (ja) | 2007-09-14 | 2013-06-19 | セイコーエプソン株式会社 | 機器およびハウジング材の製造方法 |
JP5989297B2 (ja) * | 2010-10-28 | 2016-09-07 | 株式会社中津山熱処理 | ニッケルフリーオーステナイトステンレス鋼の製造方法 |
EP2702183B1 (en) * | 2011-04-28 | 2017-12-20 | Expanite Technology A/S | Method for solution hardening of a cold deformed workpiece of a passive alloy |
JP5616299B2 (ja) * | 2011-08-09 | 2014-10-29 | ガウス株式会社 | ニッケル及びマンガンフリーの生体用又は医療用器材用高nオーステナイト系ステンレス鋼焼結用粉末及び該粉末を用いた生体用又は医療用焼結器材 |
JP5835256B2 (ja) | 2013-03-21 | 2015-12-24 | 株式会社デンソー | フェライト系ステンレス鋼製品の製造方法 |
GB2545243B (en) * | 2015-12-10 | 2017-12-13 | Rolls Royce Plc | Method of manufacturing a magnetically graded material |
KR101756703B1 (ko) | 2015-12-23 | 2017-07-12 | 주식회사 포스코 | 에칭성 및 내식성이 우수한 린 듀플렉스 스테인리스강 |
KR101867734B1 (ko) * | 2016-12-23 | 2018-06-14 | 주식회사 포스코 | 내식성이 우수한 듀플렉스 스테인리스 강 및 그 제조방법 |
EP3488024A1 (en) * | 2017-03-20 | 2019-05-29 | Apple Inc. | Steel compositions and solution nitriding of stainless steel thereof |
JP7499008B2 (ja) * | 2018-12-10 | 2024-06-13 | 日本製鉄株式会社 | 二相ステンレス鋼およびその製造方法 |
JP7257793B2 (ja) * | 2019-01-15 | 2023-04-14 | 日鉄ステンレス株式会社 | ステンレス鋼板、燃料電池用セパレータ、燃料電池セル、及び燃料電池スタック |
JP7257794B2 (ja) * | 2019-01-15 | 2023-04-14 | 日鉄ステンレス株式会社 | ステンレス鋼板及びその製造方法、燃料電池用セパレータ、燃料電池セル、並びに燃料電池スタック |
US20200407835A1 (en) * | 2019-06-26 | 2020-12-31 | Apple Inc. | Nitrided stainless steels with high strength and high ductility |
WO2023012881A1 (ja) | 2021-08-02 | 2023-02-09 | 日鉄ケミカル&マテリアル株式会社 | ステンレス鋼板、燃料電池用セパレータ、燃料電池セル、及び燃料電池スタック |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3943010A (en) * | 1974-06-12 | 1976-03-09 | Allegheny Ludlum Industries, Inc. | Process for producing austenitic ferrous alloys |
US5503687A (en) * | 1993-10-05 | 1996-04-02 | Berns; Hans | Nitrogen enrichment of surface and near surface regions to produce a high-strength austenitic surface layer in stainless steels |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2940880A (en) * | 1955-12-29 | 1960-06-14 | Standard Oil Co | Process of nitrogenization |
JPS56123327A (en) * | 1980-02-29 | 1981-09-28 | Sumitomo Metal Ind Ltd | Production of highly formable ferritic stainless steel sheet of good surface characteristic |
AU8351898A (en) * | 1997-07-21 | 1999-02-16 | Nsk Rhp European Technology Co. Limited | Case hardening of steels |
-
2002
- 2002-08-08 JP JP2002231557A patent/JP4009716B2/ja not_active Expired - Lifetime
-
2003
- 2003-08-08 WO PCT/JP2003/010164 patent/WO2004015160A1/ja active Application Filing
- 2003-08-08 EP EP03784626A patent/EP1533395A4/en not_active Withdrawn
- 2003-08-08 US US10/523,678 patent/US20060037669A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3943010A (en) * | 1974-06-12 | 1976-03-09 | Allegheny Ludlum Industries, Inc. | Process for producing austenitic ferrous alloys |
US5503687A (en) * | 1993-10-05 | 1996-04-02 | Berns; Hans | Nitrogen enrichment of surface and near surface regions to produce a high-strength austenitic surface layer in stainless steels |
Non-Patent Citations (1)
Title |
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See also references of EP1533395A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023189142A1 (ja) * | 2022-03-28 | 2023-10-05 | 日鉄ケミカル&マテリアル株式会社 | 電磁波シールド材 |
Also Published As
Publication number | Publication date |
---|---|
JP4009716B2 (ja) | 2007-11-21 |
JP2004068115A (ja) | 2004-03-04 |
US20060037669A1 (en) | 2006-02-23 |
EP1533395A4 (en) | 2008-06-11 |
EP1533395A1 (en) | 2005-05-25 |
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