CN111074132A - Nickel-free non-magnetic high-strength stainless steel and application thereof - Google Patents
Nickel-free non-magnetic high-strength stainless steel and application thereof Download PDFInfo
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 159
- 239000010935 stainless steel Substances 0.000 title claims abstract description 159
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 33
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 235000013619 trace mineral Nutrition 0.000 claims description 3
- 239000011573 trace mineral Substances 0.000 claims description 3
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 239000004984 smart glass Substances 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 239000000463 material Substances 0.000 description 14
- 230000005389 magnetism Effects 0.000 description 12
- 229910052759 nickel Inorganic materials 0.000 description 7
- 238000005728 strengthening Methods 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 229910000619 316 stainless steel Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000006104 solid solution Substances 0.000 description 5
- 230000036541 health Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 201000004624 Dermatitis Diseases 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
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- 238000011161 development Methods 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 2
- 230000005298 paramagnetic effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 206010067484 Adverse reaction Diseases 0.000 description 1
- 229910003321 CoFe Inorganic materials 0.000 description 1
- 206010020751 Hypersensitivity Diseases 0.000 description 1
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000006838 adverse reaction Effects 0.000 description 1
- 208000026935 allergic disease Diseases 0.000 description 1
- 230000007815 allergy Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 208000010668 atopic eczema Diseases 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 230000006698 induction Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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Abstract
The invention provides a nickel-free non-magnetic high-strength stainless steel, which contains the following elements: cr, Mn, Co and Fe, and the weight percentage of each element satisfies the following requirements, taking the total weight of the nickel-free non-magnetic high-strength stainless steel as 100 percent: 13% < Cr < 18%, 25% < Mn < 35%, 13% < Co < 18%, inevitable impurities, and the balance Fe. On one hand, the nonmagnetic property of the stainless steel can be realized by adding Mn element and Co element; on the other hand, the Mn element and the Co element with proper contents are adopted to replace the Fe element in the stainless steel, so that the yield strength and the tensile strength of the stainless steel can be improved.
Description
Technical Field
The invention belongs to the technical field of stainless steel, and particularly relates to nickel-free non-magnetic high-strength stainless steel and application of the nickel-free non-magnetic high-strength stainless steel in the field of wearable equipment.
Background
Stainless steel is widely used in the fields of home decoration, food, electronics, medical treatment and the like due to its excellent processability and good corrosion resistance. With the development and popularization of information technology, various electronic devices have higher and higher requirements on a nonmagnetic environment, wherein the requirements of the medical industry are particularly strict. The currently widely used 304 stainless steel does not have a fully austenitic structure, so that the non-magnetism of the product cannot be ensured. The other common 316 stainless steel can realize a complete austenite structure, but has relatively weak mechanical properties (yield strength and tensile strength), and cannot meet the requirement of some stainless products on high strength. Furthermore, the conventional stainless steel generally uses nickel to stabilize austenite tissues, but the precipitation of nickel ions can cause adverse reactions such as dermatitis, eczema, allergy and the like on human skin and tissues, which is not good for the health of users.
To the wearable equipment of rapid development in recent years (like intelligent bracelet, wrist-watch, glasses etc.), urgently need a stainless steel that does not contain nickel, nonmagnetic, guarantee user and electronic equipment's safety, possess higher intensity and wear resistance simultaneously, prolong the life of stainless steel equipment. Therefore, further improvements are urgently needed in the existing stainless steel materials.
Disclosure of Invention
The invention aims to provide a nickel-free non-magnetic high-strength stainless steel, and aims to solve the problems that the existing stainless steel is difficult to meet the requirements of non-magnetism and high strength, and the traditional stainless steel uses nickel to stabilize austenite tissues, so that the health of a user is influenced.
The invention aims to provide application of nickel-free nonmagnetic high-strength stainless steel in the field of wearable equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a nickel-free non-magnetic high-strength stainless steel in a first aspect, which contains the following elements: cr, Mn and CoFe, and the weight percentage of each element satisfies the following requirements, taking the total weight of the nickel-free non-magnetic high-strength stainless steel as 100 percent: 13% < Cr < 18%, 25% < Mn < 35%, 13% < Co < 18%, inevitable impurities, and the balance Fe.
The invention provides application of the nickel-free nonmagnetic high-strength stainless steel in the field of wearable equipment.
The nickel-free non-magnetic high-strength stainless steel provided by the invention contains 25-35 wt% of Mn element and 13-18 wt% of Co element on the basis of Fe and Cr elements. On one hand, the addition of Mn element and Co element converts Fe and Cr element structures existing in a body-centered cubic structure into a face-centered cubic structure, thereby achieving the effect of stabilizing the austenite structure of the stainless steel and realizing the non-magnetism of the stainless steel. On the other hand, Mn element and Co element with proper contents are used for replacing Fe element in stainless steel, martensite is subjected to solid solution strengthening treatment to generate phase transformation, and the gamma phase is promoted to be converted into the epsilon phase, so that the yield strength of the stainless steel can be improved, and the plasticity and tensile strength of the material are improved. In addition, because the stainless steel does not contain nickel element, when the stainless steel is used for wearable equipment, the influence of the nickel element on the health of a user can be avoided.
When the nickel-free non-magnetic high-strength stainless steel provided by the invention is used in the field of wearable equipment, the safety of users and electronic equipment can be guaranteed due to the characteristics of nickel-free non-magnetic property; meanwhile, the stainless steel has higher strength and wear resistance, so that the service life of the stainless steel equipment can be prolonged.
Drawings
FIG. 1 is a phase distribution diagram of EBSD of stainless steel provided in example 1 of the present invention;
FIG. 2 is an electron back-scattered diffraction pattern of stainless steel provided in example 1 of the present invention;
FIG. 3 is a graph showing the grain size distribution of stainless steel according to example 1 of the present invention;
FIG. 4 is a graph of engineering stress-strain curves for a nickel-free nonmagnetic high strength stainless steel provided in example 1 of the present invention;
FIG. 5 is a graph of engineering stress-strain curves for a nickel-free nonmagnetic high strength stainless steel provided in example 2 of the present invention;
FIG. 6 is a graph of engineering stress-strain curves for a nickel-free nonmagnetic high strength stainless steel provided in example 3 of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The first aspect of the embodiments of the present invention provides a nickel-free non-magnetic high-strength stainless steel, which contains the following elements: cr, Mn, Co, Si and Fe, and the weight percentage of each element satisfies the following requirements, taking the total weight of the nickel-free non-magnetic high-strength stainless steel as 100 percent: 13% < Cr < 18%, 25% < Mn < 35%, 13% < Co < 18%, 0.3% < Si < 0.6%, and the balance Fe.
The nickel-free non-magnetic high-strength stainless steel provided by the embodiment of the invention contains 25-35 wt% of Mn element and 13-18 wt% of Co element on the basis of Fe, Cr and Si elements. On one hand, the addition of Mn element and Co element converts Fe and Cr element structures existing in a body-centered cubic structure into a face-centered cubic structure, thereby achieving the effect of stabilizing the austenite structure of the stainless steel and realizing the non-magnetism of the stainless steel. On the other hand, Mn element and Co element with proper contents are used for replacing Fe element in stainless steel, martensite is subjected to solid solution strengthening treatment to generate phase transformation, and the gamma phase is promoted to be converted into the epsilon phase, so that the yield strength of the stainless steel can be improved, and the plasticity and tensile strength of the material are improved. In addition, because the stainless steel does not contain nickel element, when the stainless steel is used for wearable equipment, the influence of the nickel element on the health of a user can be avoided.
Specifically, in the embodiment of the invention, the Fe element is used as a base element of the stainless steel material, and the basic performance of the stainless steel material is given to the Fe element. Meanwhile, the stainless steel contains 13-18 wt% of Cr element. Wherein, the Cr element has passivation protection capability and can improve the corrosion resistance of the stainless steel.
The Fe element and the Cr element are in a body-centered cubic structure, so that the stainless steel material formed by the Fe element and the Cr element has magnetism. In view of this, the stainless steel according to the embodiment of the present invention includes Mn element 25-35 wt% and Co element 13-18 wt%. The stainless steel added with Mn element and Co element can not only stabilize the austenite structure of the stainless steel, but also realize the non-magnetism of the stainless steel; meanwhile, the stainless steel added with Mn element and Co element increases the strength of the stainless steel.
In addition, the nickel-free non-magnetic high-strength stainless steel inevitably contains Si element with the weight percentage of 0.3-0.6%. The Si element is used as a steelmaking deoxidizer, remains in the steelmaking process, and is used for reducing the oxygen content of a matrix and increasing the toughness of the stainless steel material. In addition, in the stainless steel provided by the embodiment of the invention, based on specific element types and contents thereof, the mechanical strength of the stainless steel can be further improved after the solution strengthening treatment is carried out on the Si atoms with smaller volume.
In some embodiments, the stainless steel is composed of a Cr element, a Mn element, a Co element, a Fe element, and inevitable impurities. The inevitable impurity element may be an Si element.
In some embodiments, the weight percentage of each element in the stainless steel satisfies: 14% < Cr < 16%, 25% < Mn < 32%, 14% < Co < 18%, the remainder being Fe. The elements in the stainless steel are controlled within the range, the obtained stainless steel consists of a gamma phase and an epsilon phase, the non-magnetism of the stainless steel is realized, and the plasticity and the tensile strength of the material are improved.
In some embodiments, the weight percentage of each element in the stainless steel satisfies: 14.5% < Cr < 15.5%, 29% < Mn < 31%, 14.5% < Co < 15.5%, the balance being Fe. The elements in the stainless steel are controlled within the range, the obtained stainless steel consists of a gamma phase and an epsilon phase, and the non-magnetism of the stainless steel can be realized; the yield strength of the obtained stainless steel is more than 550MPa, the tensile strength is close to 900MPa, and the elongation is 53%.
In some embodiments, the weight percentage of each element in the stainless steel satisfies: 14.5% < Cr < 15.5%, 25% < Mn < 27%, 16.5% < Co < 17.5%, the balance being Fe. The elements in the stainless steel are controlled within the range, the obtained stainless steel consists of a gamma phase and an epsilon phase, and the non-magnetism of the stainless steel can be realized; and the yield strength of the obtained stainless steel is 560MPa, the tensile strength is 790MPa, and the elongation is 68%.
In some embodiments, the stainless steel further contains trace elements, and the trace elements are selected from rare earth elements and N elements. The N element has a solid solution strengthening effect, so that the yield strength of the stainless steel can be improved by solid solution strengthening.
In some embodiments, the stainless steel contains the following elements: cr, Mn, Co, N and Fe, and the weight percentage of each element satisfies the following requirements, taking the total weight of the nickel-free non-magnetic high-strength stainless steel as 100 percent: 14.5% < Cr < 15.5%, 25% < Mn < 27%, 16.5% < Co < 17.5%, 0.8% < N < 1.2%, and the balance Fe. The elements in the stainless steel are controlled within the range, the obtained stainless steel consists of a gamma phase and an epsilon phase, and the non-magnetism of the stainless steel can be realized; the yield strength of the obtained stainless steel is 800MPa, the tensile strength is 1050MPa, and the elongation is 38%.
It should be noted that the stainless steel according to the embodiment of the present invention does not contain Ni, so as to avoid the effect of Ni on the safety performance of the user when the stainless steel is used as an electronic device, particularly a wearable device. On the basis of the above embodiment, it is preferable that the stainless steel is composed of Cr element, Mn element, Co element, Si element, and Fe element. The stainless steel preferably does not contain other elements, so that the introduction of miscellaneous elements is reduced, the influence on the performance of the stainless steel is reduced, and the non-magnetism and the mechanical property of the stainless steel are ensured.
In the embodiment of the invention, the stainless steel consists of a gamma phase and an epsilon phase. The gamma phase and the epsilon phase are paramagnetic tissues and cannot be magnetized by an external magnetic field, so that the nonmagnetic characteristic of the stainless steel is ensured. Wherein, the existence of epsilon phase leads to the remarkable improvement of the yield strength of the stainless steel material, and the stainless steel can generate high work hardening in the deformation process, thereby further improving the plasticity and the tensile strength of the material. Particularly, in the embodiment of the invention, the stacking fault energy of the stainless steel material can be changed by adjusting the contents of the Mn element and the Co element, so that the adjustment of the two-phase structure (gamma phase + epsilon phase) of the stainless steel is realized. The whole transformation induced plasticity enhancement process is realized by a mechanism of converting gamma phase into epsilon phase, and any magnetic tissue is not generated, so that the stainless steel can be randomly processed into products with different shapes.
The proportion of the epsilon phase stainless steel to the total volume of the stainless steel may vary depending on the heat treatment process and composition. However, in the examples of the present application, the epsilon phase stainless steel accounts for 5% to 50% of the total volume of the stainless steel. The content ratio of the epsilon phase is in the range, so that the yield strength of the stainless steel can be greatly improved.
In the embodiment of the invention, the stainless steel can be prepared by adopting a conventional casting mode. And (3) keeping the temperature of the block subjected to smelting and pouring for 2 hours at 1200 ℃ for solution treatment, forging the block at 1100 ℃ after the solution treatment, wherein the structure of the block subjected to forging is uniform and free of segregation, and the obtained stainless steel consists of a gamma phase and an epsilon phase. The gamma phase and the epsilon phase are paramagnetic tissues and cannot be magnetized by an external magnetic field, so that the nonmagnetic characteristic of the stainless steel is ensured.
The material is different from common commercial 316L stainless steel in that twinning induced strengthening is adopted in the deformation process, so that the strength and the plasticity of the material are improved. The stainless steel provided by the embodiment of the invention has the advantages that the plasticity is enhanced through martensite phase transformation induction, and the work hardening rate is higher than that of 316L stainless steel on the premise of ensuring the non-magnetism, so that the tensile strength is increased. Due to the high yield strength, high tensile strength and good ductility, the application field of the stainless steel provided by the embodiment of the invention in structural components is greatly widened.
The second aspect of the embodiment of the invention provides an application of the nickel-free non-magnetic high-strength stainless steel in the field of wearable equipment.
When the nickel-free non-magnetic high-strength stainless steel provided by the embodiment of the invention is used in the field of wearable equipment, the safety of a user and electronic equipment can be guaranteed due to the characteristics of nickel-free non-magnetic property; meanwhile, the stainless steel has higher strength and wear resistance, so that the service life of the stainless steel equipment can be prolonged.
Specifically, the wearable device includes, but is not limited to, a smart bracelet, a smart watch, and smart glasses.
The following description will be given with reference to specific examples.
Example 1
A nickel-free, non-magnetic, high strength stainless steel, said stainless steel comprising the following elements: cr, Mn, Co and Fe, and the weight percentage of each element satisfies the following requirements, taking the total weight of the nickel-free non-magnetic high-strength stainless steel as 100 percent: cr 15% +/-0.5%, Mn 30% +/-1%, Co 15% +/-0.5%, inevitable impurities and the balance of Fe.
The nickel-free non-magnetic high strength stainless steel of example 1 was subjected to mechanical properties and XRD phase analysis, and the results are shown in fig. 1 below. As can be seen from FIG. 1, the stainless steel microstructure provided in example 1 is composed of two phases, γ and ε.
Further, Electron Back Scattering Diffraction (EBSD) analysis and stainless steel grain size analysis were performed on the nickel-free nonmagnetic high strength stainless steel of example 1, and the results are shown in fig. 2 and 3, respectively. As can be seen from fig. 2 and 3: after forging, the average grain size of the stainless steel is about 10 mu m; the epsilon phase accounts for about 5% of the total volume of the stainless steel, but greatly improves the yield strength of the stainless steel. The nickel-free nonmagnetic high strength stainless steel provided in example 1 was subjected to mechanical property test, and the engineering stress-strain curve thereof is shown in fig. 4. As can be seen from FIG. 4, the yield strength of the nickel-free nonmagnetic high-strength stainless steel provided in example 1 is more than 550MPa, which is twice that of the commercial 316L stainless steel, and the tensile strength is close to 900MPa, and is far greater than that of the 316L stainless steel. On the basis of high strength, the stainless steel still keeps high elongation which is 53 percent, and provides reliable guarantee for the subsequent processing of materials.
Example 2
A nickel-free, non-magnetic, high strength stainless steel, said stainless steel comprising the following elements: cr, Mn, Co and Fe, and the weight percentage of each element satisfies the following requirements, taking the total weight of the nickel-free non-magnetic high-strength stainless steel as 100 percent: mn 26% +/-1%, Cr 15% +/-0.5%, Co 17% +/-0.5%, inevitable impurities and the balance of Fe.
The nickel-free nonmagnetic high strength stainless steel provided in example 2 was subjected to mechanical property test, and the engineering stress-strain curve thereof is shown in fig. 5. As can be seen from FIG. 5, the yield strength of the nickel-free nonmagnetic high strength stainless steel provided in example 2 was 560MPa, the tensile strength was 790MPa, and the elongation was 68%. Compared with the embodiment 1, the mechanical properties of the alloy can be changed by finely adjusting the components and adjusting the heat treatment process, so that corresponding alloy design and processing schemes can be made according to specific requirements.
Example 3
A nickel-free, non-magnetic, high strength stainless steel, said stainless steel comprising the following elements: cr, Mn, Co, N and Fe, and the weight percentage of each element satisfies the following requirements, taking the total weight of the nickel-free non-magnetic high-strength stainless steel as 100 percent: the alloy comprises the following components of 30% +/-1% of Mn, 15% +/-0.5% of Cr, 15% +/-0.5% of Co, 1% +/-0.2% of N, inevitable impurities and the balance of Fe.
The nickel-free nonmagnetic high strength stainless steel provided in example 3 was subjected to mechanical property test, and the engineering stress-strain curve thereof is shown in fig. 6. As can be seen from FIG. 6, example 3 had a yield strength of 800MPa, a tensile strength of 1050MPa and an elongation of 38%. Although a part of the elongation was lost by the solid solution strengthening effect, the yield strength was greatly improved as compared with example 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A nickel-free nonmagnetic high-strength stainless steel is characterized by comprising the following elements: cr, Mn, Co and Fe, and the weight percentage of each element satisfies the following requirements, taking the total weight of the nickel-free non-magnetic high-strength stainless steel as 100 percent: 13% < Cr < 18%, 25% < Mn < 35%, 13% < Co < 18%, inevitable impurities, and the balance Fe.
2. The nickel-free nonmagnetic high strength stainless steel according to claim 1, wherein the stainless steel is composed of a Cr element, a Mn element, a Co element, a Fe element and inevitable impurities.
3. The nickel-free nonmagnetic high strength stainless steel according to claim 2, wherein the weight percentage of each element in the stainless steel satisfies: 14% < Cr < 16%, 25% < Mn < 32%, 14% < Co < 18%, the remainder being Fe.
4. The nickel-free nonmagnetic high strength stainless steel according to claim 3, wherein the weight percentage of each element in the stainless steel satisfies: 14.5% < Cr < 15.5%, 29% < Mn < 31%, 14.5% < Co < 15.5%, the balance being Fe; or
The stainless steel comprises the following elements in percentage by weight: 14.5% < Cr < 15.5%, 25% < Mn < 27%, 16.5% < Co < 17.5%, the balance being Fe.
5. The nickel-free nonmagnetic high strength stainless steel according to claim 1, wherein the stainless steel further contains trace elements selected from the group consisting of rare earth elements and N elements.
6. The nickel-free nonmagnetic high strength stainless steel according to claim 5, characterized in that the stainless steel contains the following elements: cr, Mn, Co, N and Fe, and the weight percentage of each element satisfies the following requirements, taking the total weight of the nickel-free non-magnetic high-strength stainless steel as 100 percent: 14.5% < Cr < 15.5%, 25% < Mn < 27%, 16.5% < Co < 17.5%, 0.8% < N < 1.2%, and the balance Fe.
7. The nickel-free nonmagnetic high strength stainless steel according to any of claims 1 to 6, wherein the stainless steel consists of a gamma phase and an epsilon phase.
8. The nickel-free nonmagnetic high strength stainless steel according to claim 7, wherein the epsilon phase stainless steel accounts for 5 to 50% of the total volume of the stainless steel.
9. Use of the nickel-free nonmagnetic high strength stainless steel according to any one of claims 1 to 8 in the field of wearable devices.
10. The use of the nickel-free non-magnetic high strength stainless steel of claim 9 in the field of wearable devices, wherein the wearable devices comprise smartband, smartwatch, smartglasses.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112322847A (en) * | 2020-11-16 | 2021-02-05 | 深圳市泛海统联精密制造股份有限公司 | Heat treatment method of non-magnetic nickel-free high-chromium stainless steel |
| WO2021254143A1 (en) * | 2020-06-19 | 2021-12-23 | 香港大学 | High-strength ultra-corrosion-resistant non-magnetic stainless steel and preparation method therefor |
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| 袁军平等: "高氮无镍奥氏体不锈钢的研究与发展", 《铸造》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021254143A1 (en) * | 2020-06-19 | 2021-12-23 | 香港大学 | High-strength ultra-corrosion-resistant non-magnetic stainless steel and preparation method therefor |
| CN112322847A (en) * | 2020-11-16 | 2021-02-05 | 深圳市泛海统联精密制造股份有限公司 | Heat treatment method of non-magnetic nickel-free high-chromium stainless steel |
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