CN111020406A - Low-nickel all-austenite nonmagnetic stainless steel and manufacturing method and application thereof - Google Patents
Low-nickel all-austenite nonmagnetic stainless steel and manufacturing method and application thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
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- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
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- 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
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- C22C33/04—Making ferrous alloys by melting
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Abstract
The invention discloses a low-nickel all-austenite nonmagnetic stainless steel and a manufacturing method and application thereof, and the low-nickel all-austenite nonmagnetic stainless steel comprises the following components in percentage by weight: 0.08-0.12% of carbon, 0.2-0.6% of silicon, 13.6-14% of manganese, less than or equal to 0.045% of phosphorus, less than or equal to 0.003% of sulfur, 16.1-16.5% of chromium, 4.05-4.3% of nickel, 0-0.5% of molybdenum, 0.4-0.7% of copper, 0.14-0.18% of nitrogen, and the balance of iron and other inevitable impurities; the low-nickel all-austenite nonmagnetic stainless steel is produced by at least performing steel making and rough rolling on each composition. The invention has the advantages that through the design of the composition and the manufacturing process, the austenite phase is adopted in the production process, no ferrite phase transformation occurs, the stress crack caused by poor thermoplasticity is improved, the excellent molten steel purity is obtained, and the recompression defect or the product deformation cracking caused by inclusions is avoided.
Description
Technical Field
The invention belongs to the technical field of stainless steel smelting, particularly relates to a full-austenite non-magnetic stainless steel, and particularly relates to a low-nickel full-austenite non-magnetic stainless steel, a manufacturing method thereof and application thereof in clothing products.
Background
The conditions of needle breakage, blade bringing and the like inevitably occur in the production process of clothing products, the QB/T2638-2004 light industry standard belt type needle checking machine of the people's republic of China is formally implemented in 1 month and 1 day of 2005, the inspection of textile product needle checking is implemented as a part of quality control standard, and the occurrence of the event that the consumer is injured due to the residual needle breakage in the clothing is effectively controlled. As the clothing products inevitably use metal products such as buttons, hooks, zippers and the like, in order to meet the standard requirements of needle detection, the clothing product industry chooses non-magnetic soft metals such as copper, aluminum and the like for realizing the non-magnetic effect. The defects are that the non-magnetic soft metal has the problems of insufficient strength, easy rusting, high processing cost and the like, and the development of the metal material for the clothes is always puzzled. The non-magnetic stainless steel is an ideal material for manufacturing metal products for clothing products, but the research and development of the non-magnetic stainless steel is carried out in China only after 2010, most of produced stainless steel products cannot realize complete non-magnetism, and a small part of stainless steel products can realize the non-magnetism effect but are expensive due to the use of more precious metals.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems that the existing stainless steel product can not meet the requirement of needle inspection standard and is expensive, the invention aims to provide the low-nickel all-austenite nonmagnetic stainless steel and the manufacturing method and the application thereof.
2. Technical scheme
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-nickel all-austenite nonmagnetic stainless steel is characterized by comprising the following components in percentage by weight: 0.08-0.12% of carbon, 0.2-0.6% of silicon, 13.6-14% of manganese, less than or equal to 0.045% of phosphorus, less than or equal to 0.003% of sulfur, 16.1-16.5% of chromium, 4.05-4.3% of nickel, 0-0.5% of molybdenum, 0.4-0.7% of copper, 0.14-0.18% of nitrogen, and the balance of iron and other inevitable impurities; the low-nickel all-austenite nonmagnetic stainless steel is manufactured by at least carrying out steel making and rough rolling on each component; the steel-making step uses a dolomite steel ladle; the alkalinity of the refining furnace is 1.8-2.1, and in the reduction stage of the refining furnace, 0.5% Al and low Al3# FeSi are added as reducing agents to ensure full reduction; reducing the mixing of Al component into molten steel;
before the ladle treatment is started, completely slagging off is carried out, 50-150kg of covering agent is covered on the surface of molten steel, and floating non-metallic inclusions are adsorbed in the later ladle treatment process; blowing argon gas at the bottom of the steel ladle for stirring, and standing after the argon gas stirring is finished;
after solidification, additional phase transformation occurs during cooling of the metal to room temperature, Creq/NieqIf the crystal size is less than 1.37, an A mode L → gamma + L → gamma is selected for solidification and crystallization;
the first pass reduction rate of the rough rolling step is 5-10%, the final rough rolling total reduction rate is 80-88%, and the number of rough rolling passes is 7-9; the rough rolling temperature of the casting blank is 1190-1210 ℃;
the relative magnetic permeability of the low-nickel all-austenite non-magnetic stainless steel is less than 1.002 mu r.
Furthermore, the argon blowing soft stirring time is 20-30min, and the standing time is 30-40 min.
Further, the low-nickel all-austenite nonmagnetic stainless steel comprises the following components in percentage by weight: 0.1% of carbon, 0.4% of silicon, 13.8% of manganese, 0.001% of sulfur, 16.3% of chromium, 4.1% of nickel, 0.1% of molybdenum, 0.5% of copper, 0.16% of nitrogen and the balance of iron and other inevitable impurities.
The invention also provides a manufacturing method of the low-nickel all-austenite nonmagnetic stainless steel, which is characterized in that the components of the low-nickel all-austenite nonmagnetic stainless steel are manufactured by at least steel making and rough + -rolling; the steel-making step uses a dolomite steel ladle; the alkalinity of the refining furnace is 1.8-2.1, and in the reduction stage of the refining furnace, 0.5% Al and low Al3# FeSi are added as reducing agents to ensure full reduction; reducing the mixing of Al component into molten steel;
before the ladle treatment is started, completely slagging off is carried out, 50-150kg of covering agent is covered on the surface of molten steel, and floating non-metallic inclusions are adsorbed in the later ladle treatment process; blowing argon gas at the bottom of the steel ladle for stirring, and standing after the argon gas stirring is finished;
after solidification, additional phase transformation occurs during cooling of the metal to room temperature, Creq/NieqIf the crystal size is less than 1.37, an A mode L → gamma + L → gamma is selected for solidification and crystallization;
the first pass reduction rate of the rough rolling step is 5-10%, the final rough rolling total reduction rate is 80-88%, and the number of rough rolling passes is 7-9; the rough rolling temperature of the casting blank is 1190-1210 ℃;
the composition comprises the following components in percentage by weight: 0.08-0.12% of carbon, 0.2-0.6% of silicon, 13.6-14% of manganese, less than or equal to 0.045% of phosphorus, less than or equal to 0.003% of sulfur, 16.1-16.5% of chromium, 4.05-4.3% of nickel, 0-0.5% of molybdenum, 0.4-0.7% of copper, 0.14-0.18% of nitrogen, and the balance of iron and other inevitable impurities; the relative magnetic permeability of the low-nickel all-austenite nonmagnetic stainless steel is less than 1.002 mur。
Furthermore, the argon blowing soft stirring time is 20-30min, and the standing time is 30-40 min.
Further, the low-nickel all-austenite nonmagnetic stainless steel comprises the following components in percentage by weight: 0.1% of carbon, 0.4% of silicon, 13.8% of manganese, 0.001% of sulfur, 16.3% of chromium, 4.1% of nickel, 0.1% of molybdenum, 0.5% of copper, 0.16% of nitrogen and the balance of iron and other inevitable impurities.
On the other hand, the invention also provides application of the low-nickel all-austenite non-magnetic stainless steel in clothing products, and the low-nickel all-austenite non-magnetic stainless steel is used for manufacturing metal products such as buttons, hooks, zippers and the like.
The raw material components of the low-nickel all-austenite nonmagnetic stainless steel provided by the invention comprise ferrite forming elements of chromium, silicon and molybdenum; austenite forms the elements nickel, carbon, nitrogen, manganese, copper.
Carbon is an element for stabilizing austenite, the action of the carbon is 30 times of that of nickel, and meanwhile, the carbon can cause the plasticity of the low-nickel all-austenite nonmagnetic stainless steel to be reduced, so that the carbon element component range is selected to be 0.08-0.12%.
Nitrogen, a strong solid solution element, and nitrogen can strongly form and stabilize austenite, the effect is about 20 times of that of nickel, the content of nitrogen is increased, the thermoplasticity is reduced, and the strength of the material is improved, so the content range of nitrogen is selected to be 0.14-0.18%.
Manganese is an austenite forming element, the function of the manganese is related to the content of nickel, the content of manganese is high in the invention, the purpose is to improve the solubility of nitrogen, and the range of manganese element components is selected to be 13.6-14.0%.
Relative magnetic permeability murMagnetic permeability of a special medium and vacuum magnetic permeability mu0The ratio and the relative magnetic permeability of the magnetic sensor are technical parameters for measuring the magnetism of the stainless steel, and the magnetic requirement of the non-magnetic stainless steel product on the detection precision of the clothing product combined with a needle detector cannot exceed 1.002 mu to the maximum extentr. Particularly, for products such as buttons and the like which need cold deformation such as stamping processing and the like, austenite structures are required all the time, ferrite cannot be remained, and martensite transformation cannot be processed, otherwise, the magnetic property of the products is inevitably caused, and an alarm is generated in the needle detection process.
In order to obtain a nonmagnetic stainless steel, a single austenite phase must be obtained and the stability of the austenite structure is ensured during cold deformation. The index for evaluating the tissue stability of the low-nickel all-austenite nonmagnetic stainless steel is Md30Namely, the deformation temperature at which the low-nickel all-austenite nonmagnetic stainless steel undergoes 30% cold deformation and exhibits a martensite structure, and a lower value indicates higher stability of the austenite phase,Md30the calculation formula is as follows:
Md30(℃)＝413－462(％C+％N)－9.2(％Si)－8.1(％Mn)－13.7(％Cr)－9.5(％Ni)－18.5(％Mo)；
all the components of the invention are substituted into a formula to calculate Md 30-121 to-60 ℃.
The low-nickel all-austenite nonmagnetic stainless steel comprises the following components in percentage by weight: 0.1% of carbon, 0.4% of silicon, 13.8% of manganese, 0.001% of sulfur, 4.1% of nickel, 0.1% of molybdenum, 0.5% of copper, 0.16% of nitrogen, and the balance of iron and other inevitable impurities, and substituting the formula to calculate Md30 ═ 87 ℃.
Therefore, the non-magnetic stainless steel has a stable austenite structure during cold deformation, and the magnetic flux is measured to be 1.000-1.003 mu when the cold rolling reduction rate is about 60% in the actual production processrAfter full solid solution at 1050 ℃, the magnetic flux of the final stainless steel product is less than or equal to 1.002 murAnd meets the needle inspection standard of clothing products.
The low-nickel all-austenite non-magnetic stainless steel needs to be precisely rolled and stamped in the use environment of clothing products, the stainless steel containing inclusions has inclusion crack defects in the precise rolling process and cracks caused by the inclusions in the final stamping process, and the inclusions also cause thermal stress cracks.
The control of the purity of the molten steel is mainly related to the control of the steelmaking process, and the quantity and the size of inclusions are mainly controlled. 1) The alkalinity of the refining furnace is controlled to be 1.8-2.1, and the quantity and the size of inclusions in molten steel are effectively reduced. 2) In the reduction stage of a refining furnace, 0.5% of Al and low Al3# FeSi are added as reducing agents, sufficient reduction time is guaranteed for 10-15 min, a dolomite steel ladle is used, the source of foreign inclusions is controlled, the foreign inclusions are mainly slag, refractory materials and the like which are introduced due to the interaction of molten steel, slag and used refractory materials in the smelting, tapping and casting processes, and the foreign inclusions are generally coarse; the refractory material is also an important source of foreign inclusions, and the dolomite ladle reduces the mixing of Al components into molten steel. 3) Before the ladle treatment is started, completely slagging off is carried out, and 50-150kg of covering agent is covered on the surface of molten steel and is used for adsorbing floating nonmetallic inclusions in the later ladle treatment process; in the stirring treatment of argon blowing at the bottom of the steel ladle, sufficient argon blowing soft stirring time is ensured for 20-30min, and bottom blowing gas can stir and mix the molten steel uniformly, so that nonmetallic inclusions in the molten steel collide with each other, are combined and grow up in the stirring process, and float and separate from the molten steel under the action of buoyancy; in order to obtain more sufficient floating of the impurities, the standing floating time of 30-40min needs to be ensured after argon blowing and stirring.
The content, the form and the distribution of delta ferrite are factors influencing the thermoplasticity of the low-nickel all-austenite nonmagnetic stainless steel. The room temperature structure of the low-nickel all-austenite nonmagnetic stainless steel depends on the solidification behavior and the subsequent solid-state phase transition. The initial phase of the low-nickel all-austenite nonmagnetic stainless steel is either a ferrite phase or an austenite phase when the low-nickel all-austenite nonmagnetic stainless steel is solidified, and the initial phase mainly depends on the composition components. After solidification, additional phase changes occur during cooling of the metal to room temperature, and this additional phase change is of paramount importance. For low-nickel all-austenite nonmagnetic stainless steel, Cr is addedeq/NieqJudging the solidification mode by the ratio with the standard of Creq/Nieq< 1.37 is A mode; cr in the inventioneq/Nieq1.27 < 1.37, the invention adopts the A mode L → gamma + L → gamma to carry out solidification and crystallization, namely, no delta ferrite phase is precipitated in the process that the metal is cooled to room temperature after solidification, but the mode of taking ferrite as the initial precipitated phase is more beneficial to improving the thermoplasticity of the material than the mode of taking austenite as the initial precipitated phase. This is because ferrite has high solubility for impurity elements such as sulfur and phosphorus, and thus segregation of these impurity elements among dendrites can be restricted by the solidification process using ferrite as an initial precipitation phase. Therefore, the solidification and crystallization in the A mode according to the present invention may result in a decrease in the thermoplasticity and surface crack defects. To improveThermal stress cracks are generated in the thermal deformation process, and the cracking defect of the stainless steel is improved or even eliminated by adjusting the process parameters, the deformation temperature and the strain amount. 1) The first pass reduction rate of rough rolling is reduced by 5-10% (the initial pass crack generation rate is reduced), the low reduction rate is adopted, the number of rough rolling passes is increased, and the method is favorable for improving surface stress cracks. In the initial 1-3 times of thermal deformation, if deep cracks do not occur, the probability of thermal stress cracks in the subsequent time is greatly reduced. The initial as-cast structure is more prone to cracking than the equiaxed structure which undergoes recrystallization, whereas the second pass undergoes recrystallization after the first pass of rough rolling. Therefore, the strain of the first pass of rough rolling is reduced, and the number of passes is properly increased under the condition that the total strain is not changed, which is beneficial to reducing the generation of surface cracks. 2) The deformation temperature, in the as-cast low-nickel all-austenite nonmagnetic stainless steel, may decrease rapidly with the decrease of the deformation temperature. Therefore, the main factor of the hot rolling cracking of the casting blank is caused by the fact that the temperature of the blank is reduced too fast after the blank is discharged from the furnace, so that the temperature is too low when rough rolling is started, and particularly, intensive thermal stress cracking can occur within 200mm of the edge of a hot rolled plate coil. Therefore, the in-furnace time and the preheating temperature of the casting blank are properly increased, the thorough burning of the blank is ensured, the tapping temperature is ensured, the rough rolling temperature of the casting blank is increased to about 1190-1210 ℃, the plastic loss temperature interval is avoided, and the thermal stress cracks in 200mm on two sides of the hot rolled plate coil can be obviously improved.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
1) the low-nickel all-austenite non-magnetic stainless steel disclosed by the invention is subjected to adjustment test of hot rolling parameters, the rough rolling starting temperature is selected to be 1190-1210 ℃ through adjustment test of hot rolling parameters, the first pass low reduction rate is adopted, the number of rough rolling passes is properly increased, the first pass reduction rate in the rough rolling stage is 5-10%, the number of passes is increased by 1-2, the thermal stress crack occurrence rate, the generation length and the depth are obviously improved, and the final product quality is not influenced.
2) The invention reduces impurities, improves the purity of molten steel and reduces the segregation of impurity elements among dendrites in the solidification process through process control in the steelmaking process.
3) Compared with the similar non-magnetic stainless steel, the invention has the advantages of reduced component cost (low nickel) and complete non-magnetism (the relative magnetic permeability is less than or equal to 1.002 mu r) in processing and use.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a graph showing the relationship between the basicity of a refining slag and the number and size of inclusions in molten steel according to the present invention.
FIG. 2 is a photograph of an EPMA of example 1 of the present invention.
Fig. 3 is a photograph of the thermal stress crack EPMA of comparative example 1.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a low-nickel all-austenite nonmagnetic stainless steel, which comprises the following components in percentage by weight: 0.1% of carbon, 0.4% of silicon, 13.8% of manganese, 0.001% of sulfur, 16.3% of chromium, 4.1% of nickel, 0.1% of molybdenum, 0.5% of copper, 0.16% of nitrogen and the balance of iron and other inevitable impurities;
in order to obtain a nonmagnetic stainless steel, a single austenite phase must be obtained and the stability of the austenite structure is ensured during cold deformation. The index for evaluating the structure stability of the low-nickel all-austenite non-magnetic stainless steel is Md30, namely the deformation temperature of the low-nickel all-austenite non-magnetic stainless steel when 30% cold deformation occurs and a martensite structure appears, the lower the value is, the higher the austenite phase stability is, and the calculation formula of Md30 is as follows:
Md30(℃)＝413－462(％C+％N)－9.2(％Si)－8.1(％Mn)－13.7(％Cr)－9.5(％Ni)－18.5(％Mo)；
the components of the invention are substituted into a formula to calculate Md 30-87 ℃.
The low-nickel all-austenite nonmagnetic stainless steel is manufactured by at least carrying out steel making and rough rolling on each component; the steel-making step uses a dolomite steel ladle; the alkalinity of the refining furnace is 1.8-2.1, as shown in figure 1, when the alkalinity of refining slag is increased, the quantity and the size of impurities in molten steel are reduced; in the reduction stage of the refining furnace, 0.5 percent of Al and low Al3# FeSi are added as reducing agents to ensure full reduction; reducing the mixing of Al component into molten steel;
before the ladle treatment is started, completely slagging off is carried out, 50-150kg of covering agent is covered on the surface of molten steel, and floating non-metallic inclusions are adsorbed in the later ladle treatment process; and blowing argon gas at the bottom of the steel ladle for stirring, wherein the argon gas is blown for soft stirring for 20-30min, and standing for 30-40min after the argon gas stirring is finished.
After solidification, additional phase transformation occurs during cooling of the metal to room temperature, Creq/NieqIf the crystal size is less than 1.37, an A mode L → gamma + L → gamma is selected for solidification and crystallization;
the first pass reduction rate of the rough rolling step is 5-10%, the final rough rolling total reduction rate is 80-88%, and the number of rough rolling passes is 7-9; the rough rolling temperature of the casting blank is 1190-1210 ℃;
by adopting the first pass of strain reduction and multi-pass rolling, the crack retention rate is obviously reduced, EPMA analysis is carried out on the crack position, as shown in figure 2, the depth of the generated thermal stress crack is maximally 40um, and the length of the crack is greatly reduced by about 40 um.
The relative magnetic permeability of the low-nickel all-austenite non-magnetic stainless steel is less than 1.002 mu r.
The non-magnetic stainless steel is suitable for processing buttons and zippers and meets the use environment of clothing products.
Comparative example 1
The manufacturing method of the austenitic stainless steel provided by the present comparative example is substantially the same as that of example 1, except that it is found that the first pass strain amount of rough rolling is 18%, thermal stress cracks are generated, EPMA analysis is performed on the crack positions, as shown in fig. 3, the cracks are obviously extended inward to 90um, and the longer length is 600 um.
Comparative example 2
304(Cr-Ni) series, 316L (Cr-Ni-Mo) series low-nickel all-austenitic non-magnetic stainless steels are conventionally classified as non-magnetic steels, but tend to retain or develop some magnetic properties due to compositional differences or processing effects. In addition, the general low-nickel all-austenite nonmagnetic stainless steel is limited by components, the content of austenite stable elements is insufficient, and the steel at normal temperature generally contains about 5-10% of delta ferrite, so the steel has slight magnetism. Also, because austenite is not sufficiently stable, it accompanies a partial transformation of austenite structure into deformed martensite structure during cold working, and since δ ferrite and martensite both belong to strong magnetic structures, 304, 316L stainless steels exhibit different magnetic properties during working and use thereof.
Comparative example 3
Although the existing steel (310S stainless steel) with the mark 06Cr25Ni20 in China can achieve the nonmagnetic effect, the addition of a large amount of Ni metal of more than 19 percent causes precious metal waste, the product is expensive, and the large-scale application cannot be realized.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The low-nickel all-austenite nonmagnetic stainless steel is characterized by comprising the following components in percentage by weight: 0.08-0.12% of carbon, 0.2-0.6% of silicon, 13.6-14% of manganese, less than or equal to 0.045% of phosphorus, less than or equal to 0.003% of sulfur, 16.1-16.5% of chromium, 4.05-4.3% of nickel, 0-0.5% of molybdenum, 0.4-0.7% of copper, 0.14-0.18% of nitrogen, and the balance of iron and other inevitable impurities; the low-nickel all-austenite nonmagnetic stainless steel is manufactured by at least carrying out steel making and rough rolling on each component; the steel-making step uses a dolomite steel ladle; the alkalinity of the refining furnace is 1.8-2.1, and in the reduction stage of the refining furnace, 0.5% Al and low Al3# FeSi are added as reducing agents to ensure full reduction; reducing the mixing of Al component into molten steel;
before the ladle treatment is started, completely slagging off is carried out, 50-150kg of covering agent is covered on the surface of molten steel, and floating non-metallic inclusions are adsorbed in the later ladle treatment process; blowing argon gas at the bottom of the steel ladle for stirring, and standing after the argon gas stirring is finished;
after solidification, additional phase transformation occurs during cooling of the metal to room temperature, Creq/NieqIf the crystal size is less than 1.37, an A mode L → gamma + L → gamma is selected for solidification and crystallization;
the first pass reduction rate of the rough rolling step is 5-10%, the final rough rolling total reduction rate is 80-88%, and the number of rough rolling passes is 7-9; the rough rolling temperature of the casting blank is 1190-1210 ℃;
the relative magnetic permeability of the low-nickel all-austenite non-magnetic stainless steel is less than 1.002 mu r.
2. The low-nickel all-austenitic nonmagnetic stainless steel according to claim 1, characterized in that: and the argon blowing soft stirring time is 20-30min, and the standing time is 30-40 min.
3. The low-nickel all-austenitic nonmagnetic stainless steel according to claim 1, characterized in that: the low-nickel all-austenite nonmagnetic stainless steel comprises the following components in percentage by weight: 0.1% of carbon, 0.4% of silicon, 13.8% of manganese, 0.001% of sulfur, 16.3% of chromium, 4.1% of nickel, 0.1% of molybdenum, 0.5% of copper, 0.16% of nitrogen and the balance of iron and other inevitable impurities.
4. A manufacturing method of low-nickel all-austenite nonmagnetic stainless steel is characterized in that each component of the low-nickel all-austenite nonmagnetic stainless steel is at least manufactured by steel making and rough rolling; the steel-making step uses a dolomite steel ladle; the alkalinity of the refining furnace is 1.8-2.1, and in the reduction stage of the refining furnace, 0.5% Al and low Al3# FeSi are added as reducing agents to ensure full reduction; reducing the mixing of Al component into molten steel;
before the ladle treatment is started, completely slagging off is carried out, 50-150kg of covering agent is covered on the surface of molten steel, and floating non-metallic inclusions are adsorbed in the later ladle treatment process; blowing argon gas at the bottom of the steel ladle for stirring, and standing after the argon gas stirring is finished;
after solidification, additional phase transformation occurs during cooling of the metal to room temperature, Creq/NieqIf the crystal size is less than 1.37, an A mode L → gamma + L → gamma is selected for solidification and crystallization;
the first pass reduction rate of the rough rolling step is 5-10%, the final rough rolling total reduction rate is 80-88%, and the number of rough rolling passes is 7-9; the rough rolling temperature of the casting blank is 1190-1210 ℃;
the composition comprises the following components in percentage by weight: 0.08-0.12% of carbon, 0.2-0.6% of silicon, 13.6-14% of manganese, less than or equal to 0.045% of phosphorus, less than or equal to 0.003% of sulfur, 16.1-16.5% of chromium, 4.05-4.3% of nickel, 0-0.5% of molybdenum, 0.4-0.7% of copper, 0.14-0.18% of nitrogen, and the balance of iron and other inevitable impurities; the relative magnetic permeability of the low-nickel all-austenite non-magnetic stainless steel is less than 1.002 mu r.
5. The method of manufacturing a low-nickel all-austenite nonmagnetic stainless steel according to claim 4, wherein: and the argon blowing soft stirring time is 20-30min, and the standing time is 30-40 min.
6. The method of manufacturing a low-nickel all-austenite nonmagnetic stainless steel according to claim 4, wherein: the low-nickel all-austenite nonmagnetic stainless steel comprises the following components in percentage by weight: 0.1% of carbon, 0.4% of silicon, 13.8% of manganese, 0.001% of sulfur, 4.1% of nickel, 0.1% of molybdenum, 0.5% of copper, 0.16% of nitrogen, and the balance of iron and other inevitable impurities.
7. Use of the low nickel all-austenitic non-magnetic stainless steel according to any of claims 1 to 3 in apparel products.
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