EP1533395A1 - Method for manufacturing stainless steel product by nitrogen absorption treatment and stainless steel product produced by the method - Google Patents
Method for manufacturing stainless steel product by nitrogen absorption treatment and stainless steel product produced by the method Download PDFInfo
- Publication number
- EP1533395A1 EP1533395A1 EP03784626A EP03784626A EP1533395A1 EP 1533395 A1 EP1533395 A1 EP 1533395A1 EP 03784626 A EP03784626 A EP 03784626A EP 03784626 A EP03784626 A EP 03784626A EP 1533395 A1 EP1533395 A1 EP 1533395A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stainless steel
- product
- steel product
- nitrogen
- absorption treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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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
- This invention relates to a manufacturing process of a stainless steel product by nitrogen absorption treatment and to a stainless steel product thereby obtained. More particularly, this invention relates to a manufacturing process of a stainless steel product by nitrogen absorption treatment, which can decrease production cost of austenitic stainless steel which is considered to be difficult to process, and can manufacture a stainless steel product having fully satisfactory properties in both strength and corrosion resistance, and to a stainless steel product thereby obtained.
- Austenitic stainless steel is a material which is difficult to process and its difficulty to work into a desired shape raises its production cost. As austenitic stainless steel is outstanding in both corrosion resistance and strength, it is desired that its products having desired shapes, including even complicated ones, be supplied at a low cost.
- This invention has been made under such circumstances and has as an object to provide a method of manufacturing a stainless steel product by nitrogen absorption treatment, which can decrease production cost of austenitic stainless steel which is considered to be difficult to process, and can manufacture a stainless steel product having fully satisfactory properties regarding both strength and corrosion resistance, and to provide a stainless steel product thereby obtained.
- this invention provides a manufacturing process of a stainless steel product by nitrogen absorption treatment, characterized by bringing a bulk product of ferritic stainless steel, which is made by melting, forming and machining into a desired shape, into contact with an inert gas containing nitrogen at or above 800°C to austenitize the product completely, or to austenitize it partially and form a two-phase structure composed of ferrite and austenite (claim 1).
- This invention also provides a stainless steel product characterized by having a completely austenitic structure which is formed by adding nitrogen through contact with an inert gas containing nitrogen, to a bulk product of ferritic stainless steel which is made by melting, forming and machining into a desired shape (claim 2).
- this invention provides a stainless steel product characterized by having a two-phase structure of ferrite and austenite which is formed by adding nitrogen through contact with an inert gas containing nitrogen, to a bulk product of ferritic stainless steel which is made by melting, forming and machining into a desired shape, so as to austenitize it partially (claim 3).
- a bulk product of ferritic stainless steel made by melting, forming and machining into a desired shape is brought into contact with an inert gas containing nitrogen at or above 800 °C, so that it may be austenitized completely, or may be austenitized partially to have a two-phase structure formed from ferrite and austenite.
- a technique of bringing a bulk product having a desired shape into contact with an inert gas containing nitrogen at or above 800°C belongs to a nitrogen absorption treatment classified as a solid-phase absorption method. Nitrogen is added to the whole product or a part thereof by heating it to or above 800°C in an inert gas atmosphere containing nitrogen.
- the method of this invention of manufacturing a stainless steel product by nitrogen absorption treatment makes it possible to obtain a product having a desired shape easily, since the product to which nitrogen is added is made of ferritic stainless steel which is easier to work than austenitic stainless steel.
- the stainless steel product of this invention which can be obtained as described is completely austenitized, or is partially austenitized and has a two-phase structure formed from ferrite and austenite. Therefore, the stainless steel product of this invention is outstanding in both corrosion resistance and strength and is advantageously an inexpensive product, since its cost of processing is low, even if it may have a complicated shape.
- the addition of at least about 0.5% by mass of nitrogen to a bulk product of ferritic stainless steel is sufficient for achieving the results as mentioned above.
- a round shape tensile test specimen with a planar shape as shown in Fig. 4 was formed by machining the round bar shown in Fig. 2. These two kinds of test specimens were given nitrogen absorption treatment by a nitrogen absorption furnace.
- Each test specimen was placed on a mesh board of SUS304 stainless steel, degreased and cleansed with acetone, and inserted in a nitrogen absorption portion of the nitrogen absorption furnace.
- the furnace was evacuated by a rotary pump until 2 Pa.
- an inert gas containing nitrogen was introduced into the nitrogen absorption portion at a rate of two liters per minute, the nitrogen absorption portion was heated from room temperature to 1200°C at a rate of 5°C per minute and the test specimen was kept in contact with nitrogen at 1200°C for 24 hours.
- the test specimen was quenched in iced water from 1200°C. After removal of scale from a surface by polishing, a microstructure was examined by using an X-ray diffractometer. A CuK ⁇ tube was used for X-ray diffraction and 2 ⁇ / ⁇ was varied from 40 to 90 degrees at a rate of one degree per minute. The X -ray diffraction pattern as obtained is shown in Fig. 5(a).
- Fig. 5(b) shows the X-ray diffraction pattern of a material equivalent to the test specimen, but not given nitrogen absorption treatment.
- the test specimen given nitrogen absorption treatment was made of perfectly austenitic stainless steel. The amount of nitrogen addition was about 0.9% by mass.
- a tensile test was conducted on the test specimen by using an Instron-type testing machine with a capacity of 100 kN at a crosshead speed of 0.5 mm per minute.
- Fig. 6 shows balance found between strength and ductility of the test specimen which had been given nitrogen absorption treatment, of the material equivalent to the test specimen which had not been given nitrogen absorption treatment and of a conventional alloy.
- the nitrogen absorption treatment realized a better balance between strength and ductility as compared with the conventional alloy and the material equivalent to the test specimen which had not been given nitrogen absorption treatment. The effectiveness of nitrogen absorption treatment was thus confirmed.
- test specimen was also evaluated for corrosion resistance.
- Figs. 7(a) to (d) are the polarization curves obtained by polarization tests conducted for evaluation on corrosion resistance. As is confirmed by Figs. 7(a) to (d), the test specimen showed higher corrosion resistance in all of the test solutions than the 316L stainless steel and the material equivalent to the test specimen not given nitrogen absorption treatment, and it did not have any pitting corrosion, as is obvious from Fig. 8(a). Pitting corrosion was found in 316L stainless steel, as shown in Fig. 8(b).
- the method of this invention of manufacturing a stainless steel product by nitrogen absorption treatment and the stainless steel product thereby obtained overcome the difficulty in processing austenitic stainless steel and make it possible for even a product having a complicated shape to be obtained at a low cost and have satisfactorily high levels of strength and corrosion resistance.
- this invention provides a stainless steel product formed from austenitic stainless steel which is considered to be difficult to process, has a desired shape, can be processed at a satisfactorily low production cost and has fully satisfactory properties with regard to both strength and corrosion resistance, and a method of manufacturing the same.
Abstract
Description
- This invention relates to a manufacturing process of a stainless steel product by nitrogen absorption treatment and to a stainless steel product thereby obtained. More particularly, this invention relates to a manufacturing process of a stainless steel product by nitrogen absorption treatment, which can decrease production cost of austenitic stainless steel which is considered to be difficult to process, and can manufacture a stainless steel product having fully satisfactory properties in both strength and corrosion resistance, and to a stainless steel product thereby obtained.
- Austenitic stainless steel is a material which is difficult to process and its difficulty to work into a desired shape raises its production cost. As austenitic stainless steel is outstanding in both corrosion resistance and strength, it is desired that its products having desired shapes, including even complicated ones, be supplied at a low cost.
- In the field of powder metallurgy, attempts have been made to have nitrogen absorbed at the time of sintering, but as large-scaled equipment is required for the manufacture of molded products by a method of powder metallurgy, the products which can be thereby manufactured are limited in size and shape. Moreover, products made by a method of powder metallurgy have numerous holes known as pores, and they affect the mechanical properties of the products and make their mechanical reliability questionable.
- No nitrogen absorption treatment has been adopted for bulk materials made by melting. The reason is that it has been common knowledge that if a metallic material is held in a nitrogen atmosphere at a high temperature for a long time, a microstructure is coarsened and mechanical properties are seriously lowered. In other words, a lowering in the mechanical reliability of bulk materials thus produced has been strongly feared.
- This invention has been made under such circumstances and has as an object to provide a method of manufacturing a stainless steel product by nitrogen absorption treatment, which can decrease production cost of austenitic stainless steel which is considered to be difficult to process, and can manufacture a stainless steel product having fully satisfactory properties regarding both strength and corrosion resistance, and to provide a stainless steel product thereby obtained.
- In order to attain the above object, this invention provides a manufacturing process of a stainless steel product by nitrogen absorption treatment, characterized by bringing a bulk product of ferritic stainless steel, which is made by melting, forming and machining into a desired shape, into contact with an inert gas containing nitrogen at or above 800°C to austenitize the product completely, or to austenitize it partially and form a two-phase structure composed of ferrite and austenite (claim 1).
- This invention also provides a stainless steel product characterized by having a completely austenitic structure which is formed by adding nitrogen through contact with an inert gas containing nitrogen, to a bulk product of ferritic stainless steel which is made by melting, forming and machining into a desired shape (claim 2).
- Moreover, this invention provides a stainless steel product characterized by having a two-phase structure of ferrite and austenite which is formed by adding nitrogen through contact with an inert gas containing nitrogen, to a bulk product of ferritic stainless steel which is made by melting, forming and machining into a desired shape, so as to austenitize it partially (claim 3).
- The manufacturing process of a stainless steel product by nitrogen absorption treatment according to this invention and the stainless steel products thereby obtained will now be described in further detail with reference to examples.
-
- Fig. 1 is a photograph in place of a drawing, showing an ingot of ferritic stainless steel (Fe - 24 mass % Cr - 2 mass % Mo) made by melting in a vacuum arc melting furnace, and weighing 3.5 kg.
- Fig. 2 is a photograph in place of a drawing, showing a round rod formed by hot and cold forging from the ingot shown in Fig. 1.
- Fig. 3 is a photograph in place of a drawing, showing a plate formed by hot and cold forging from the ingot shown in Fig. 1.
- Fig. 4 is a plan view of a round shape specimen for a tensile test formed from the round rod shown in Fig. 2.
- Figs. 5(a) and (b) show X-ray diffraction patterns of a test specimen subjected to nitrogen absorption treatment and a material equivalent to the test specimen, but not subjected to nitrogen absorption treatment, respectively.
- Fig. 6 is a correlation diagram showing balance between strength and ductility of the test specimen, an existing alloy and the equivalent material not subjected to nitrogen absorption treatment.
- Figs. 7(a), (b), (c) and (d) are polarization curves showing results of polarization tests conducted by immersing the test specimen, 316L stainless steel and the material equivalent to the test specimen but not subjected to nitrogen absorption treatment in a 0.9% NaCl solution, a PBS(-) solution, a Hanks' solution and an Eagle's MEM solution, respectively, and evaluating them for corrosion resistance.
- Figs. 8(a) and (b) are optical micrographs showing surfaces of the test specimen and 316L stainless steel, respectively, as observed after the polarization test in the Eagle's MEM solution.
-
- According to a method of this invention of manufacturing a stainless steel product by nitrogen absorption treatment, a bulk product of ferritic stainless steel made by melting, forming and machining into a desired shape is brought into contact with an inert gas containing nitrogen at or above 800 °C, so that it may be austenitized completely, or may be austenitized partially to have a two-phase structure formed from ferrite and austenite. A technique of bringing a bulk product having a desired shape into contact with an inert gas containing nitrogen at or above 800°C belongs to a nitrogen absorption treatment classified as a solid-phase absorption method. Nitrogen is added to the whole product or a part thereof by heating it to or above 800°C in an inert gas atmosphere containing nitrogen. The method of this invention of manufacturing a stainless steel product by nitrogen absorption treatment makes it possible to obtain a product having a desired shape easily, since the product to which nitrogen is added is made of ferritic stainless steel which is easier to work than austenitic stainless steel. The scale of equipment in the powder metallurgy method, limits to shaping and mechanical reliability of products is dissolved.
- The stainless steel product of this invention which can be obtained as described is completely austenitized, or is partially austenitized and has a two-phase structure formed from ferrite and austenite. Therefore, the stainless steel product of this invention is outstanding in both corrosion resistance and strength and is advantageously an inexpensive product, since its cost of processing is low, even if it may have a complicated shape. The addition of at least about 0.5% by mass of nitrogen to a bulk product of ferritic stainless steel is sufficient for achieving the results as mentioned above.
- An ingot of ferritic stainless steel (Fe - 24 mass % Cr - 2 mass % Mo) weighing 3.5 kg, as shown in Fig. 1, was made by melting in a vacuum arc melting furnace. The ingot was cut into four blocks each of which measures 25 mm square by 110 mm, and the blocks were hot-forged at 1100°C and cold-forged at ambient temperature into a round bar with 9 mm in diameter by 90 mm and a plate measuring 15 mm square by 1.5 mm in thickness, as shown in Figs. 2 and 3, respectively. A round shape tensile test specimen with a planar shape as shown in Fig. 4 was formed by machining the round bar shown in Fig. 2. These two kinds of test specimens were given nitrogen absorption treatment by a nitrogen absorption furnace.
- Each test specimen was placed on a mesh board of SUS304 stainless steel, degreased and cleansed with acetone, and inserted in a nitrogen absorption portion of the nitrogen absorption furnace. The furnace was evacuated by a rotary pump until 2 Pa. Then, an inert gas containing nitrogen was introduced into the nitrogen absorption portion at a rate of two liters per minute, the nitrogen absorption portion was heated from room temperature to 1200°C at a rate of 5°C per minute and the test specimen was kept in contact with nitrogen at 1200°C for 24 hours.
- After the nitrogen absorption treatment described above, the test specimen was quenched in iced water from 1200°C. After removal of scale from a surface by polishing, a microstructure was examined by using an X-ray diffractometer. A CuKα tube was used for X-ray diffraction and 2/ was varied from 40 to 90 degrees at a rate of one degree per minute. The X -ray diffraction pattern as obtained is shown in Fig. 5(a). For comparison, Fig. 5(b) shows the X-ray diffraction pattern of a material equivalent to the test specimen, but not given nitrogen absorption treatment. As is obvious from comparison of Figs. 5(a) and (b), the test specimen given nitrogen absorption treatment was made of perfectly austenitic stainless steel. The amount of nitrogen addition was about 0.9% by mass.
- Then, a tensile test was conducted on the test specimen by using an Instron-type testing machine with a capacity of 100 kN at a crosshead speed of 0.5 mm per minute. Fig. 6 shows balance found between strength and ductility of the test specimen which had been given nitrogen absorption treatment, of the material equivalent to the test specimen which had not been given nitrogen absorption treatment and of a conventional alloy. As is clear from Fig. 6, the nitrogen absorption treatment realized a better balance between strength and ductility as compared with the conventional alloy and the material equivalent to the test specimen which had not been given nitrogen absorption treatment. The effectiveness of nitrogen absorption treatment was thus confirmed.
- The test specimen was also evaluated for corrosion resistance.
- The test specimen, 316L stainless steel and material equivalent to the test specimen which had not been given nitrogen absorption treatment were polarized in a 0.9% NaCl solution, a PBS(-) solution, a Hanks' solution and an Eagle's MEM solution which had been prepared at 37°C and deaerated with bubbling nitrogen gas. Figs. 7(a) to (d) are the polarization curves obtained by polarization tests conducted for evaluation on corrosion resistance. As is confirmed by Figs. 7(a) to (d), the test specimen showed higher corrosion resistance in all of the test solutions than the 316L stainless steel and the material equivalent to the test specimen not given nitrogen absorption treatment, and it did not have any pitting corrosion, as is obvious from Fig. 8(a). Pitting corrosion was found in 316L stainless steel, as shown in Fig. 8(b).
- The method of this invention of manufacturing a stainless steel product by nitrogen absorption treatment and the stainless steel product thereby obtained overcome the difficulty in processing austenitic stainless steel and make it possible for even a product having a complicated shape to be obtained at a low cost and have satisfactorily high levels of strength and corrosion resistance.
- This invention is, of course, not limited by the mode or example as described above. It is needless to say that variations or modifications may be made in details including the composition of stainless steel, the shape and size of the product and the conditions of nitrogen absorption treatment.
- As is obvious from the detailed description above, this invention provides a stainless steel product formed from austenitic stainless steel which is considered to be difficult to process, has a desired shape, can be processed at a satisfactorily low production cost and has fully satisfactory properties with regard to both strength and corrosion resistance, and a method of manufacturing the same.
Claims (3)
- A manufacturing process of a stainless steel product by nitrogen absorption treatment, comprising the steps of bringing a bulk product of ferritic stainless steel made by melting, forming and machining into a desired shape, into contact with an inert gas containing nitrogen at or above 800°C, and austenitizing the product completely, or austenitizing the product partially to form a two-phase structure composed of ferrite and austenite.
- A stainless steel product having a completely austenitic structure formed by adding nitrogen through contact with an inert gas containing nitrogen, to a bulk product of ferritic stainless steel made by melting, forming and machining into a desired shape.
- A stainless steel product having a two-phase structure composed of ferrite and austenite, which is produced by adding nitrogen through contact with an inert gas containing nitrogen to a bulk product of ferritic stainless steel made by melting, forming and machining into a desired shape so as to austenitize the product partially.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002231557A JP4009716B2 (en) | 2002-08-08 | 2002-08-08 | Manufacturing method of stainless steel product by nitrogen absorption treatment and stainless steel product obtained thereby |
JP2002231557 | 2002-08-08 | ||
PCT/JP2003/010164 WO2004015160A1 (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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1533395A1 true EP1533395A1 (en) | 2005-05-25 |
EP1533395A4 EP1533395A4 (en) | 2008-06-11 |
Family
ID=31711750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03784626A Withdrawn EP1533395A4 (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 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060037669A1 (en) |
EP (1) | EP1533395A4 (en) |
JP (1) | JP4009716B2 (en) |
WO (1) | WO2004015160A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006134541A1 (en) * | 2005-06-15 | 2006-12-21 | Koninklijke Philips Electronics N.V. | Method for manufacturing a stainless steel product |
RU2600789C2 (en) * | 2011-04-28 | 2016-10-27 | Экспаните А/С | Method for solution hardening of cold deformed workpiece of passive alloy and member solution hardened by method |
GB2545243A (en) * | 2015-12-10 | 2017-06-14 | Rolls Royce Plc | Method of manufacturing a magnetically graded material |
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JP4336784B2 (en) * | 2002-11-21 | 2009-09-30 | 独立行政法人物質・材料研究機構 | Medical device for living soft tissue and manufacturing method thereof |
JP4378773B2 (en) | 2005-05-16 | 2009-12-09 | 独立行政法人物質・材料研究機構 | Stainless steel product manufacturing method and stainless steel product |
JP5212602B2 (en) | 2007-09-14 | 2013-06-19 | セイコーエプソン株式会社 | Device and housing material manufacturing method |
JP5989297B2 (en) * | 2010-10-28 | 2016-09-07 | 株式会社中津山熱処理 | Method for producing nickel-free austenitic stainless steel |
JP5616299B2 (en) * | 2011-08-09 | 2014-10-29 | ガウス株式会社 | Nickel- and manganese-free high N austenitic stainless steel sintering powder for biomedical or medical equipment, and biomedical or medical sintered equipment using the powder |
JP5835256B2 (en) | 2013-03-21 | 2015-12-24 | 株式会社デンソー | Manufacturing method of ferritic stainless steel products |
KR101756703B1 (en) | 2015-12-23 | 2017-07-12 | 주식회사 포스코 | Lean duplex stainless steel with improved corrosion resistance and etching ability |
KR101867734B1 (en) * | 2016-12-23 | 2018-06-14 | 주식회사 포스코 | Duplex stainless steel having exceleent corrosin resistance and method for manufacturing the same |
CN109642297A (en) * | 2017-03-20 | 2019-04-16 | 苹果公司 | The Solid Solution Nitriding of steel compositions and its stainless steel |
JP2020094266A (en) * | 2018-12-10 | 2020-06-18 | 日本製鉄株式会社 | Two-phase stainless steel and manufacturing method therefor |
JP7257794B2 (en) * | 2019-01-15 | 2023-04-14 | 日鉄ステンレス株式会社 | Stainless steel plate and its manufacturing method, fuel cell separator, fuel cell, and fuel cell stack |
JP7257793B2 (en) * | 2019-01-15 | 2023-04-14 | 日鉄ステンレス株式会社 | Stainless steel plate, fuel cell separator, fuel cell, and fuel cell stack |
US20200407835A1 (en) * | 2019-06-26 | 2020-12-31 | Apple Inc. | Nitrided stainless steels with high strength and high ductility |
WO2023012881A1 (en) | 2021-08-02 | 2023-02-09 | 日鉄ケミカル&マテリアル株式会社 | Stainless steel sheet, separator for fuel battery, fuel battery cell and fuel battery stack |
WO2023189142A1 (en) * | 2022-03-28 | 2023-10-05 | 日鉄ケミカル&マテリアル株式会社 | Electromagnetic shielding material |
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US2940880A (en) * | 1955-12-29 | 1960-06-14 | Standard Oil Co | Process of nitrogenization |
US3943010A (en) * | 1974-06-12 | 1976-03-09 | Allegheny Ludlum Industries, Inc. | Process for producing austenitic ferrous alloys |
WO1999005340A1 (en) * | 1997-07-21 | 1999-02-04 | Nsk-Rhp European Technology Co. Limited | Case hardening of steels |
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JPS56123327A (en) * | 1980-02-29 | 1981-09-28 | Sumitomo Metal Ind Ltd | Production of highly formable ferritic stainless steel sheet of good surface characteristic |
DE4333917C2 (en) * | 1993-10-05 | 1994-06-23 | Hans Prof Dr Ing Berns | Edge embroidery to create a high-strength austenitic surface layer in stainless steels |
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2002
- 2002-08-08 JP JP2002231557A patent/JP4009716B2/en not_active Expired - Lifetime
-
2003
- 2003-08-08 US US10/523,678 patent/US20060037669A1/en not_active Abandoned
- 2003-08-08 WO PCT/JP2003/010164 patent/WO2004015160A1/en active Application Filing
- 2003-08-08 EP EP03784626A patent/EP1533395A4/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2940880A (en) * | 1955-12-29 | 1960-06-14 | Standard Oil Co | Process of nitrogenization |
US3943010A (en) * | 1974-06-12 | 1976-03-09 | Allegheny Ludlum Industries, Inc. | Process for producing austenitic ferrous alloys |
WO1999005340A1 (en) * | 1997-07-21 | 1999-02-04 | Nsk-Rhp European Technology Co. Limited | Case hardening of steels |
Non-Patent Citations (1)
Title |
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See also references of WO2004015160A1 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006134541A1 (en) * | 2005-06-15 | 2006-12-21 | Koninklijke Philips Electronics N.V. | Method for manufacturing a stainless steel product |
US9382608B2 (en) | 2005-06-15 | 2016-07-05 | Koninklijke Philips N.V. | Method for manufacturing a stainless steel product |
RU2600789C2 (en) * | 2011-04-28 | 2016-10-27 | Экспаните А/С | Method for solution hardening of cold deformed workpiece of passive alloy and member solution hardened by method |
GB2545243A (en) * | 2015-12-10 | 2017-06-14 | Rolls Royce Plc | Method of manufacturing a magnetically graded material |
GB2545243B (en) * | 2015-12-10 | 2017-12-13 | Rolls Royce Plc | Method of manufacturing a magnetically graded material |
US10483037B2 (en) | 2015-12-10 | 2019-11-19 | Rolls-Royce Plc | Method of manufacturing a magnetically graded material |
Also Published As
Publication number | Publication date |
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WO2004015160A1 (en) | 2004-02-19 |
JP4009716B2 (en) | 2007-11-21 |
US20060037669A1 (en) | 2006-02-23 |
JP2004068115A (en) | 2004-03-04 |
EP1533395A4 (en) | 2008-06-11 |
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