WO2016020985A1 - 耐食性・高硬度合金組成物およびその製造方法 - Google Patents
耐食性・高硬度合金組成物およびその製造方法 Download PDFInfo
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- WO2016020985A1 WO2016020985A1 PCT/JP2014/070621 JP2014070621W WO2016020985A1 WO 2016020985 A1 WO2016020985 A1 WO 2016020985A1 JP 2014070621 W JP2014070621 W JP 2014070621W WO 2016020985 A1 WO2016020985 A1 WO 2016020985A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
Definitions
- the present invention has high corrosion resistance to hydrofluoric acid and high hardness (abrasion resistance) compared to conventional Ni-based alloy materials, and is suitable as a resin molding screw and cylinder material for a fluorine-containing resin.
- the present invention relates to a product and a method of manufacturing the same.
- screw and cylinder for resin molding such as fluorine-containing resin such as PFA (perfluoro alkoxy alkane), PTFE (polytetrafluoroethylene), ETFE (ethylene-tetrafluoroethylene copolymer), PVDF (polyvinylidene fluoride), etc.
- fluorine-containing resin such as PFA (perfluoro alkoxy alkane), PTFE (polytetrafluoroethylene), ETFE (ethylene-tetrafluoroethylene copolymer), PVDF (polyvinylidene fluoride), etc.
- a Ni-Cr-Mo base alloy excellent in corrosion resistance against hydrofluoric acid is used as a member such as, for example.
- the conventional Ni-funded material having excellent corrosion resistance has a problem that the wear resistance is low because the hardness of the alloy is low.
- a member such as a screw or cylinder of a resin molding machine is also required to have wear resistance to contact with a fluorine-containing resin fluid pumped at high pressure and high speed.
- a fluorine-containing resin fluid pumped at high pressure and high speed.
- Co-based alloy having corrosion resistance and wear resistance comprising C: 1.5% or less and the balance Co is disclosed (see, for example, Patent Document 1).
- Co which is the main component of this alloy, is a rare metal and a strategic material, is expensive, and is unstable in supply.
- a Ni-based alloy having corrosion resistance to hydrofluoric acid is disclosed as an alloy having high corrosion resistance to hydrofluoric acid, consisting of Cr: 16%, Mo: 15%, Fe: 6%, W: 4% balance Ni.
- Non-Patent Document 1 a Ni-based alloy having corrosion resistance to hydrofluoric acid, consisting of Cr: 16%, Mo: 15%, Fe: 6%, W: 4% balance Ni.
- the wear resistance is also improved without deteriorating the corrosion resistance when no processing is given (uniformized treatment state) Although this can be done, if the hardness of the material is further improved by cold working, the corrosion resistance to hydrofluoric acid will be drastically deteriorated.
- the present invention uses the Ni-Co-Cr-Mo-Fe-Cu alloy, although the raw material cost is slightly higher than the conventionally used Ni-Cr-Mo-Fe-W alloy.
- An object of the present invention is to provide a corrosion-resistant high-hardness alloy composition which achieves both corrosion resistance and hardness by optimizing the chemical composition, heat treatment conditions and processing conditions, and a method for producing the same.
- Cr 15.5 to 16.5 wt%
- Mo 7.5 to 15.5 wt%
- Co 0 to 30 wt%
- Fe 4.5 to 15 wt%
- Cu 0.5 to 4.0 wt%
- alloy composition consisting of Ni and unavoidably mixed elements, characterized in that the crystal phase is a single phase of ⁇ phase and the bicus hardness at room temperature is 500 HV or more. Corrosion resistant and high hardness alloy composition is obtained.
- Cr 15.5 to 16.5 wt%
- Mo 7.5 to 15.5 wt%
- Co 0 to 30 wt%
- Fe 4.5 to 15 wt%
- Cu 0. 5 to 4.0 wt%
- Ni and an alloy ingot consisting of unavoidably mixed elements are homogenized at 1100 to 1300 ° C. for 4 to 24 hours, and then cold worked at a compressibility of 30 to 60%. After that, aging treatment is carried out in a temperature range of 300 ° C. to 600 ° C. for 0.5 to 3 hours, whereby a method for producing a corrosion resistant and high hardness alloy composition can be obtained.
- Cu is added to optimize the chemical composition, heat treatment conditions, and processing conditions in order to improve the deterioration of the corrosion resistance due to the processing of the Ni-Co-Cr-Mo-Fe alloy.
- a corrosion-resistant, high-hardness alloy composition and a method for producing the same that achieve both corrosion resistance and wear resistance. This enables long-term operation of a member such as a screw / cylinder of resin molding such as fluorine-containing resin, which can contribute to cost reduction of a plastic resin molded product.
- FIG. 2 is a phase diagram of a Ni-30Co-16Cr-15Mo-6Fe-xCu (wt%) alloy according to an embodiment of the present invention.
- FIG. 2 is a phase diagram of a Ni-30Co-16Cr-6Fe-2Cu-xMo (wt%) alloy according to an embodiment of the present invention.
- each component of the Ni-based alloy of the present invention is as follows.
- Cr 15.5 to 16.5 wt%
- Cr is added in an amount of 15.5 to 16.5 wt% to form a solid solution of Cr in the matrix to ensure the corrosion resistance of the alloy in the oxidizing atmosphere. If it is less than 15.5%, a dense Cr 2 O 3 oxide film can not be formed in an oxidizing atmosphere, so the lower limit is 15.5%. If it exceeds 16.5%, the hardness and mechanical properties of the alloy decrease, so the upper limit is 16.5%.
- Mo 7.5 to 15.5 wt% so that a passive film in which Mo and Cu are mixed can be formed in a hydrofluoric acid atmosphere when Cu: 0.5 to 4.0 wt% is added.
- Mo is less than 7.5%, a dense passive film can not be formed in a non-oxidizing atmosphere (hydrofluoric acid), so the lower limit is 7.5 wt%. If it exceeds 15.5 wt%, the Mo rich ⁇ phase tends to precipitate, the composition on the surface of the alloy becomes uneven, and the corrosion resistance of the hydrofluoric acid decreases, so the upper limit was 15.5 wt%.
- Fe 4.5-15 wt%
- Fe is effective in improving the processability of the material.
- its content needs to be at least 4.5% or more.
- Fe is cheaper than Ni and Co
- the addition of Fe is effective in reducing the cost of the material.
- addition of more than 17 wt% of Fe causes brittle ⁇ phase to precipitate in the alloy matrix phase, which has the effect of reducing the workability and plasticity of the alloy.
- a brittle ⁇ phase precipitates, so it is generally preferable to set the amount of iron to 4.5 to 15 wt%.
- Unavoidably incorporated elements are elements having high workability which are mixed from the raw material during production or from the crucible during casting, carbon: 0.05% or less, Mn: 0.5% or less, Al: 0. 5% or less, Si: 0.5% or less.
- Table 1 shows that each alloy in the table is subjected to homogenization treatment at 1250 ° C. for 24 hours, cold forging at a working ratio of 30% or 60%, and aging treatment at 600 ° C. for 1 hour, It is the viscos hardness of the material in the state after performing each processing. As shown in Table 1, the addition of cold working clearly increases the hardness of all materials. In addition, the hardness of the material can be further increased by performing the aging treatment after adding the cold working. After cold working and aging, the hardness of the alloy substituted with Ni by Co is considerably higher than the hardness of the alloy not containing Co.
- the additive amount of Co when the additive amount of Co is increased from 0 wt% to 5 wt%, 10 wt%, 15 wt%, and 30 wt%, the change in hardness of the material is small in the homogenization treatment state, but after cold working and aging treatment It can be seen that the hardness of the alloy is increasing strongly depending on the amount of Co.
- Table 2 shows weight loss rates (mg / cm 2 ) when immersed in hydrofluoric acid (5.2 M) at 100 ° C. for 100 hours after performing each treatment for the alloys in the table.
- Table 2 shows weight loss rates (mg / cm 2 ) when immersed in hydrofluoric acid (5.2 M) at 100 ° C. for 100 hours after performing each treatment for the alloys in the table.
- the additive amount of Co is increased from 0 wt% to 5 wt%, 10 wt%, 15 wt%, and 30 wt%
- no influence on the corrosion resistance of the material is observed in the uniform treatment state.
- the corrosion resistance of the Ni-16Cr-6Fe-Mo alloy not containing Co is excellent even after cold working.
- the corrosion resistance of the alloy to which Co is added is rapidly reduced after aging treatment at 600 ° C. for one hour.
- the corrosion resistance after cold working is obviously deteriorated as the amount of Co added increases.
- 2 wt% of Cu it is understood that
- Tables 3 and 4 show that after homogenization, no cold working, cold working at a working ratio of 30%, or cold working at 60% and then aging treatment at 300 ° C. to 700 ° C. for 1 hour Of the Bi-30 hardness of the Ni-30Co-16Cr-15Mo-6Fe-2Cu (wt%) alloy and the alloy after each treatment were immersed in 100 ° C. hydrofluoric acid (5.2 M) for 100 hours The weight loss rate (mg / cm 2 ) at the same time is shown. As shown in Tables 3 and 4, as in Tables 1 and 2, it can be seen that cold working and aging have the effect of raising the hardness of this material. In addition, after cold working and aging treatment, it can be seen that this alloy is superior in corrosion resistance to the commercial material Ni-16Cr-15Mo-6Fe-4W.
- FIG. 2 is a phase diagram of an alloy of ⁇ 20 wt%. It can be seen from FIG. 2 that when the amount of Mo is reduced, the precipitation temperature of the ⁇ phase is drastically reduced. For example, when the amount of Mo is up to 11 wt%, the precipitation temperature of the ⁇ phase becomes 1000 ° C. (1273 K) or less, and by performing hot forging above this temperature, fine crystal grains without precipitation of the ⁇ phase are obtained. You can get the organization you
- FIG. 4 is a weight loss ratio when the alloys after these homogenization treatments are immersed in 100 ° C. hydrofluoric acid (5.2 M) for 100 hours. As shown in FIG. 3 and FIG. 4, when the amount of Mo is reduced, the bicus hardness of both types of alloys is slightly reduced.
- the weight loss rate after immersion greatly increases due to the decrease in the amount of Mo, and the corrosion resistance is significantly deteriorated.
- the change in weight loss rate after immersion due to the decrease in the amount of Mo is small (all are 1 mg / cm 2 or less), and the amount of Mo decreases. Even if corrosion resistance does not deteriorate.
- the present invention is considered to have a high possibility of using a fluorine-containing resin as an alloy composition for members such as screws and cylinders for resin molding.
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
[Co:0~30wt%]
Co添加は、高強度化による耐摩耗特性改善に効果を発揮することから、添加量としては、15~30wt%添加が好ましい。しかし、特に耐摩耗特性に配慮しない用途の場合には、Coを無添加で実用に供することも可能であり、このことを考慮して、Co添加量を0~30wt%とする。30wt%以上にすると、非特許文献1に記載のように、μ相が析出しやすくなり、耐食性が悪化する。また、合金のコストも高くなるため、上限は30wt%にした。
マトリックスにCrを固溶させて合金の酸化雰囲気中耐食性を確保するために、Crを15.5~16.5wt%添加する。15.5%未満にすると、酸化雰囲気中緻密的なCr2O3酸化皮膜を形成できないため、15.5%を下限にした。16.5%を超えると、合金の硬度と機械特性とが低下するため、16.5%を上限にした。
Cu:0.5~4.0wt%添加された場合に、フッ酸雰囲気中で、MoとCuとが混在する不動態被膜が形成できるよう、Mo:7.5~15.5wt%にした。Moを7.5%未満にすると、非酸化雰囲気中(フッ酸)に緻密的不動態被膜が形成できないため、7.5wt%を下限にした。15.5wt%を超えると、Moリッチのμ相が析出しやすく、合金の表面の組成が不均一となり、耐フッ酸の耐食性が低下するため、15.5wt%を上限にした。
Feは材料の加工性改善に奏効する。特に、Coが存在するときには、少なくとも4.5%以上の含有が必要である。また、FeがNi、Coよりも安いため、Feを添加すると材料のコストの低減にも効果がある。しかし、17wt%を超えるFeを添加すると、合金母相に脆いσ相が析出し、合金の加工性と塑性とが低下するという影響を与える。このように、鉄を17~18wt%以上添加すると、脆いσ相が析出するため、一般的に鉄の量は4.5~15wt%にすることが好ましい。
Cuが0.5~4.0wt%添加された場合には、フッ酸雰囲気中で、Moの代わりにCuの不動態被膜を形成することができ、Moの量を減らし、μ相析出温度を低下する効果がある。また、Cu添加された場合、合金の耐食性が冷間加工後に、さらに低下しない効果もある。4.0%以上に添加すると、シグマ(σ)相の析出を促進し、耐食性が悪化する。また、4.0%以上に添加すると、合金の加工性も悪化するため、一般的にCuの量は0.5~4.0wt%にすることが好ましい。
Claims (2)
- Cr:15.5~16.5wt%、Mo:7.5~15.5wt%、Co:0~30wt%、Fe:4.5~15wt%、Cu:0.5~4.0wt%、残部:Ni及び不可避的に混入する元素からなる合金組成物であり、結晶相がγ相の単一相であり、室温でのビッカス硬さが500HV以上であることを特徴とする耐食性・高硬度合金組成物。
- Cr:15.5~16.5wt%、Mo:7.5~15.5wt%、Co:0~30wt%、Fe:4.5~15wt%、Cu:0.5~4.0wt%、残部:Ni及び不可避的に混入する元素からなる合金のインゴットを、1100~1300℃で4~24時間均一化処理した後、圧縮率30~60%で冷間加工をしてから、300℃から600℃の温度範囲において0.5~3時間時効処理することを特徴とする耐食性・高硬度合金組成物の製造方法。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2014/070621 WO2016020985A1 (ja) | 2014-08-05 | 2014-08-05 | 耐食性・高硬度合金組成物およびその製造方法 |
| EP14899105.2A EP3178950B1 (en) | 2014-08-05 | 2014-08-05 | Corrosion-resistant high-hardness alloy composition and process for producing same |
| JP2016539719A JP6600885B2 (ja) | 2014-08-05 | 2014-08-05 | 耐食性・高硬度合金組成物およびその製造方法 |
| CN201480081096.7A CN106715733B (zh) | 2014-08-05 | 2014-08-05 | 耐蚀性高硬度合金组合物及其制备方法 |
| US15/500,653 US10513757B2 (en) | 2014-08-05 | 2014-08-05 | Corrosion-resistant, high-hardness alloy composition and method for producing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2014/070621 WO2016020985A1 (ja) | 2014-08-05 | 2014-08-05 | 耐食性・高硬度合金組成物およびその製造方法 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2016020985A1 true WO2016020985A1 (ja) | 2016-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2014/070621 Ceased WO2016020985A1 (ja) | 2014-08-05 | 2014-08-05 | 耐食性・高硬度合金組成物およびその製造方法 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US10513757B2 (ja) |
| EP (1) | EP3178950B1 (ja) |
| JP (1) | JP6600885B2 (ja) |
| CN (1) | CN106715733B (ja) |
| WO (1) | WO2016020985A1 (ja) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57210941A (en) * | 1981-06-19 | 1982-12-24 | Sumitomo Metal Ind Ltd | Alloy for high-strength oil well pipe with superior stress corrosion cracking resistance |
| JPS62260033A (ja) * | 1986-05-01 | 1987-11-12 | Mitsubishi Metal Corp | 高強度および高硬度を有する耐食性Ni基合金線材 |
| WO2006003954A1 (ja) * | 2004-06-30 | 2006-01-12 | Sumitomo Metal Industries, Ltd. | Ni基合金素管及びその製造方法 |
| JP2010001558A (ja) * | 2008-05-22 | 2010-01-07 | Mitsubishi Materials Corp | ハロゲンガスおよびハロゲン化合物ガス充填用ボンベのバルブ部材 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0759730B2 (ja) | 1988-04-21 | 1995-06-28 | 株式会社クボタ | プラスチック射出成形・押出成形機用耐食耐摩耗合金 |
| JP2995597B2 (ja) | 1992-08-06 | 1999-12-27 | 株式会社クボタ | プラスチック射出・押出成形機用耐食耐摩耗性Ni基合金 |
| JPH06200343A (ja) | 1993-01-04 | 1994-07-19 | Hitachi Metals Ltd | フッ素樹脂成形機用部材 |
| JP3976003B2 (ja) | 2002-12-25 | 2007-09-12 | 住友金属工業株式会社 | ニッケル基合金およびその製造方法 |
| ES2359994T3 (es) * | 2006-08-09 | 2011-05-30 | Haynes International, Inc. | Aleaciones de niquel hidridas resistentes a la corrosión. |
| US9347121B2 (en) * | 2011-12-20 | 2016-05-24 | Ati Properties, Inc. | High strength, corrosion resistant austenitic alloys |
-
2014
- 2014-08-05 US US15/500,653 patent/US10513757B2/en active Active
- 2014-08-05 CN CN201480081096.7A patent/CN106715733B/zh active Active
- 2014-08-05 WO PCT/JP2014/070621 patent/WO2016020985A1/ja not_active Ceased
- 2014-08-05 JP JP2016539719A patent/JP6600885B2/ja active Active
- 2014-08-05 EP EP14899105.2A patent/EP3178950B1/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57210941A (en) * | 1981-06-19 | 1982-12-24 | Sumitomo Metal Ind Ltd | Alloy for high-strength oil well pipe with superior stress corrosion cracking resistance |
| JPS62260033A (ja) * | 1986-05-01 | 1987-11-12 | Mitsubishi Metal Corp | 高強度および高硬度を有する耐食性Ni基合金線材 |
| WO2006003954A1 (ja) * | 2004-06-30 | 2006-01-12 | Sumitomo Metal Industries, Ltd. | Ni基合金素管及びその製造方法 |
| JP2010001558A (ja) * | 2008-05-22 | 2010-01-07 | Mitsubishi Materials Corp | ハロゲンガスおよびハロゲン化合物ガス充填用ボンベのバルブ部材 |
Non-Patent Citations (1)
| Title |
|---|
| YUNPING LI ET AL.: "Effects of partially substituting cobalt for nickel on the corrosion resistance of a Ni-16Cr-15Mo alloy to aqueous hydrofluoric acid", CORROSION SCIENCE, vol. 78, January 2014 (2014-01-01), pages 101 - 110, XP028778321 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3178950B1 (en) | 2018-11-21 |
| EP3178950A1 (en) | 2017-06-14 |
| JPWO2016020985A1 (ja) | 2017-06-15 |
| JP6600885B2 (ja) | 2019-11-06 |
| CN106715733A (zh) | 2017-05-24 |
| EP3178950A4 (en) | 2017-07-12 |
| US20170218484A1 (en) | 2017-08-03 |
| US10513757B2 (en) | 2019-12-24 |
| CN106715733B (zh) | 2018-11-06 |
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