CN115852231A - Method for refining high-carbon chromium martensite stainless steel precipitated carbide - Google Patents
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Abstract
The invention belongs to the technical field of ferrous metallurgy, in particular to a method for refining high-carbon chromium martensite stainless steel precipitated carbide, which comprises the steps of carrying out permanent magnetic stirring in a proper time range in the process of solidifying molten steel, wherein the shear strength of the permanent magnetic stirring to the molten steel is high, convection can be enhanced in the process of solidifying, dendritic crystal tissues at the solidification front edge can be effectively broken up, the components of the molten steel at the solidification front edge are uniformly solidified, and the formed elements of the carbide are inhibited from being segregated, so that the precipitation and the growth of the precipitated carbide are inhibited, and the formation and the growth of the solidified tissue and the precipitated carbide are effectively controlled; the permanent magnetic stirring of the invention carries out physical action in a non-contact way, does not pollute molten steel, and is simple and easy to implement; the device is suitable for controlling the liquated carbides of steel ingots with different sizes, and has the typical advantages of high energy efficiency, low cost, low requirement on cooling water, simple structure, high stirring strength and good carbide refining effect.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for refining high-carbon chromium martensite stainless steel precipitated carbide.
Background
The high-carbon chromium martensite stainless steel has high hardness, high wear resistance and high corrosion resistance, and is widely applied to the preparation of high-grade cutters, structural members and the like. The steel type inevitably generates liquated carbides in the solidification process due to the high content of alloy elements such as carbon, chromium and the like. The liquated carbide has large size, irregular shape and high melting point, can damage the continuity of steel, and the surrounding matrix is easy to generate cracks when stressed, thereby reducing the processing performance and the service performance of the steel, so that the key performances of the high-carbon chromium martensite stainless steel for high-end tools and structural members, such as strength, hardness, toughness, wear resistance and the like, are badly influenced, and one of the main reasons for causing large grade difference of products. The liquated carbide is formed in the solidification process of the high-carbon chromium martensitic stainless steel and is difficult to be effectively eliminated in the subsequent processing treatment process. Therefore, the solidification process of the high-carbon chromium martensitic stainless steel is a key link for controlling liquated carbides.
Patent CN202210823071.6 discloses a high-carbon high-chromium nitrogen-containing martensitic stainless steel and a carbide refining method thereof, wherein N element is adopted to partially replace C element in the high-carbon high-chromium martensitic stainless steel, the C/N value is regulated, and nucleation and growth behaviors of carbide in the solidification process of molten steel are effectively controlled through the interaction of carbon and nitrogen, so that primary carbide is refined. On one hand, the method is not suitable for low-N stainless steel, and on the other hand, the precise control of the N content in the steel still has difficulty in the current production, so that the wide application of the method is limited. Patent CN202011637457.5 discloses a treating agent and a method for controlling primary carbide of high-carbon martensitic stainless steel through melt treatment, and a proper amount of melt treating agent is added through wire feeding to refine the primary carbide of the high-carbon martensitic stainless steel after LF or RH refining. Patent CN202111384142.9 discloses a method for improving primary carbide of ultra-high carbon martensitic stainless steel, which promotes primary carbide and component segregation to obtain maximum homogenization and dissolution through high-temperature diffusion by controlling the temperature and time of a preheating section and a heating section. The method has the problems that the diffusion of the key constituent element carbon of the carbide in the solid steel is slow, the control effect of the diffused carbide in a short time is poor, and the energy consumption and the efficiency are reduced due to the long-time high-temperature diffusion. Patent CN201810231362.X discloses a method for refining primary carbide of a stainless steel cutter, which comprises the steps of heating the edge part of the cutter to be above austenitizing temperature, keeping the temperature for a period of time, discharging, carrying out multi-pass roll forging on the edge part of the cutter, and then carrying out recrystallization annealing and secondary quenching. The method has the disadvantages of more production process links and lower production efficiency.
In conclusion, how to refine the liquated carbide of the high-carbon chromium martensitic stainless steel is particularly necessary to improve the performance of the stainless steel on the premise of meeting the requirements of low cost and high efficiency production.
Disclosure of Invention
In order to solve the problems in the prior art, the invention mainly aims to provide a method for refining precipitated carbide of high-carbon chromium martensite stainless steel.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
a method for refining high-carbon chromium martensite stainless steel precipitated carbide comprises the following steps:
s1, remelting
Remelting the high-carbon chromium martensitic stainless steel raw material to obtain high-carbon chromium martensitic stainless steel liquid;
s2, solidifying and stirring by permanent magnet
And carrying out permanent magnetic stirring on the high-carbon chromium martensite stainless steel liquid in the solidification process.
As a preferred scheme of the method for refining the precipitated carbide of the high-carbon chromium martensite stainless steel, the method comprises the following steps: in the step S1, the high-carbon chromium martensitic stainless steel raw material is a high-carbon chromium martensitic stainless steel base material, and is obtained by smelting a raw material for preparing high-carbon chromium martensitic stainless steel with qualified components in an induction furnace under vacuum or argon protection.
As a preferred scheme of the method for refining the precipitated carbide of the high-carbon chromium martensite stainless steel, the method comprises the following steps: in the step S1, vacuum or argon protection is adopted in the remelting process.
As a preferred scheme of the method for refining the precipitated carbide of the high-carbon chromium martensite stainless steel, the method comprises the following steps: in the step S2, the superheat degree of the high-carbon chromium martensite stainless steel liquid before solidification is 20 to 50 ℃.
As a preferred scheme of the method for refining the precipitated carbide of the high-carbon chromium martensite stainless steel, the method comprises the following steps: in the step S2, the cooling speed in the solidification process is more than or equal to 5 ℃/min.
As a preferred scheme of the method for refining the precipitated carbide of the high-carbon chromium martensite stainless steel, the method comprises the following steps: in the step S2, the time for starting permanent magnetic stirring in the solidification process is no later than the time for starting precipitation of precipitated carbide of the high-carbon chromium martensite stainless steel, and the time for stopping permanent magnetic stirring is no earlier than the time for finishing solidification; that is to say that the first and second electrodes,
time t for starting permanent magnet stirring start Not less than the time t from the cooling of the molten steel to the beginning of the precipitation of the liquated carbide p ，
Time t for stopping permanent magnet stirring end Time t equal to or greater than the end of solidification s 。
As a preferred scheme of the method for refining the precipitated carbide of the high-carbon chromium martensite stainless steel, the method comprises the following steps: in the step S2, the temperature T at which the liquated carbide of the molten steel begins to be precipitated is calculated based on the components of the molten steel according to thermodynamic software p And temperature T at which solidification ends s 。
As a preferred scheme of the method for refining the precipitated carbide of the high-carbon chromium martensite stainless steel, the method comprises the following steps: in said step S2, according toTemperature T before cooling and solidifying of molten steel h Temperature T at which liquated carbide of molten steel begins to precipitate p Temperature T at the end of solidification s And setting a cooling speed R, and calculating the time t from the cooling of the molten steel to the beginning of the precipitation of the carbide by liquation p And time t at which coagulation ends s ：
As a preferred scheme of the method for refining the precipitated carbide of the high-carbon chromium martensite stainless steel, the method comprises the following steps: in the step S2, the permanent magnetic stirring is realized by a permanent magnetic stirrer having a hollow barrel-shaped structure, the permanent magnetic stirrer is composed of an arc permanent magnet and a permanent magnet rotating mechanism driven by electric power or hydraulic pressure, and the molten steel to be stirred is located in the permanent magnetic stirrer.
As a preferred scheme of the method for refining the precipitated carbide of the high-carbon chromium martensite stainless steel, the method comprises the following steps: in the step S2, the permanent magnetic stirrer adopts a pair of Nd-Fe-B permanent magnets arranged in NS, the radian of the magnets is 60 to 120 degrees, the central magnetic induction intensity is larger than or equal to 700Gs when the magnets are static, the rotating speed of the permanent magnets is larger than or equal to 50rpm when the magnets are stirred, and the rotating direction is one of clockwise rotation, anticlockwise rotation or clockwise and anticlockwise alternate rotation modes.
In order to solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solutions:
the high-carbon chromium martensitic stainless steel is prepared by adopting the method.
The invention has the following beneficial effects:
the invention provides a method for refining high-carbon chromium martensite stainless steel precipitated carbide, which is characterized in that permanent magnetic stirring is carried out within a proper time range in the solidification process of molten steel, the shear strength of the permanent magnetic stirring to the molten steel is high, convection can be enhanced in the solidification process, dendritic structures at the front of solidification are effectively smashed, the components of the molten steel at the front of uniform solidification inhibit the carbide from forming element segregation, so that the precipitation and growth of the precipitated carbide are inhibited, and the formation and growth of the solidified structure and the precipitated carbide are effectively controlled; the permanent magnetic stirring of the invention performs physical action in a non-contact way, does not pollute molten steel, and is simple and easy to operate; the device is suitable for controlling the liquated carbides of steel ingots with different sizes, and has the typical advantages of high energy efficiency, low cost, low requirement on cooling water, simple structure, high stirring strength and good carbide refining effect.
Drawings
In order to more clearly illustrate the embodiments of the present 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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a diagram of the appearance of the liquated carbides in the high carbon chromium martensitic stainless steel in example 1 of the present invention;
FIG. 2 is a diagram showing the morphology of the liquated carbides in the high-carbon chromium martensitic stainless steel in example 2 of the present invention;
FIG. 3 is a graphical representation of the appearance of the liquated carbides in the high carbon chromium martensitic stainless steel of comparative example 1 in accordance with the present invention;
FIG. 4 is a comparison of the area ratio of the liquated carbide to the solidification structure in the high carbon chromium martensitic stainless steels in examples 1 and 2 of the present invention and comparative example 1.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
The invention provides a method for refining high-carbon chromium martensite stainless steel liquated carbide, wherein the liquated carbide is the result of continuous enrichment of carbide forming elements in a residual liquid phase at dendritic crystal gaps at the solidification front in the solidification process of the molten steel, and the control of the liquated carbide is the control of the segregation of the carbide forming elements among dendrites of a solidification structure from the source. The invention has the beneficial technical effects that:
(1) The method effectively reduces the secondary dendrite spacing, inhibits element segregation, further refines the size of the liquated carbide, and is beneficial to improving the material performance.
(2) Different from the traditional methods for refining carbides by multiple heat treatment, multiple roll forging treatment and the like, the permanent magnetic stirring is carried out in the solidification process of the high-carbon chromium martensite stainless steel liquid, the production process is not increased, and the method is simple, convenient and efficient.
(3) Different from the method of adding the melt treating agent into the molten steel to refine carbide, the permanent magnetic stirring performs physical action in a non-contact mode, does not pollute the molten steel, and is simple, convenient and easy to implement.
(4) Different from the regulation and control of traditional electromagnetic stirring to the molten steel, permanent magnetism stirring need a large amount of cooling water along with stirring intensity's improvement unlike electromagnetic stirring, does not like electromagnetic stirring energy consumption low-usage, does not need the regular replacement coil unlike electromagnetic stirring. The stirring intensity of the permanent magnet stirring can be adjusted by adopting permanent magnets with different rotating speeds, types and sizes, the permanent magnet stirring device is suitable for controlling the liquated carbides of steel ingots with different sizes, and the permanent magnet stirring device has the advantages of low cost, simple structure, high stirring intensity and good carbide refining effect.
According to one aspect of the invention, the invention provides the following technical scheme:
a method for refining high-carbon chromium martensite stainless steel precipitated carbide comprises the following steps:
s1, remelting
Remelting the high-carbon chromium martensitic stainless steel raw material to obtain high-carbon chromium martensitic stainless steel liquid;
s2, solidifying and stirring by permanent magnet
And carrying out permanent magnetic stirring on the high-carbon chromium martensite stainless steel liquid in the solidification process.
Preferably, in the step S1, the high-carbon chromium martensitic stainless steel raw material is a high-carbon chromium martensitic stainless steel base material, and is obtained by smelting a raw material for preparing qualified high-carbon chromium martensitic stainless steel in a vacuum or argon-protected induction furnace. The method is characterized in that raw materials for smelting and preparing the high-carbon chromium martensitic stainless steel parent metal are prepared according to chemical element compositions, the raw materials have no special requirement, the raw materials for preparing the high-carbon chromium martensitic stainless steel and the components of the raw materials are proportioned, and the smelting process adopts vacuum or argon protection. Remelting the high-carbon chromium martensite stainless steel parent metal with qualified components in an induction furnace, wherein the remelting process adopts vacuum or argon protection.
Preferably, in the step S2, the superheat degree of the high-carbon chromium martensitic stainless steel liquid before solidification is 20-50 ℃. The superheat degree is controlled in the range so as to prevent coarse grains of a solidification structure and prevent the stainless steel material from being smelted slowly and having low uniformity; specifically, the degree of superheat may be, for example, but not limited to, any one of 20 ℃, 25 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃, 50 ℃ or a range between any two thereof; the cooling speed in the solidification process is more than or equal to 5 ℃/min, so that the tissue defects caused by too low cooling speed are controlled on the basis of ensuring the permanent magnet stirring time in the solidification process.
Preferably, in the step S2, the time for starting the permanent magnetic stirring in the solidification process is no later than the time for starting the precipitation of the precipitated carbide of the high-carbon chromium martensite stainless steel, and the time for stopping the permanent magnetic stirring is no earlier than the time for finishing the solidification; that is to say that the temperature of the molten steel,
time t for starting permanent magnet stirring start Not less than the time t from the cooling of the molten steel to the beginning of the precipitation of the liquated carbide p ，
Time t for stopping permanent magnet stirring end Not less than the time t at which solidification ends s 。
Further, it is preferable to calculate the temperature T at which the liquated carbide of the molten steel begins to be precipitated based on the composition of the molten steel by a method such as one of Thermo-Calc, jmatPro, factSage and other Thermo-mechanical software or a related empirical formula p And temperature T at which solidification ends s And then further onAccording to the temperature T before the molten steel is cooled and solidified h Temperature T at which liquated carbide of molten steel begins to precipitate p Temperature T at the end of solidification s And setting a cooling speed R, and calculating the time t from the cooling of the molten steel to the beginning of the precipitation of the carbide by liquation p And time t at which coagulation ends s ：
Preferably, in step S2, the permanent magnetic stirring is implemented by a permanent magnetic stirrer with a hollow barrel-shaped structure, the permanent magnetic stirrer is composed of an arc-shaped permanent magnet and an electrically or hydraulically driven permanent magnet rotating mechanism, and the molten steel to be stirred is located in the permanent magnetic stirrer. The quantity and radian of the permanent magnets are designed and determined according to numerical simulation based on the comprehensive principle that the magnetic induction intensity of a molten steel region is high, the electromagnetic force borne by the molten steel is high, the moving speed of the molten steel is high, and the stirrer is simple in structure.
Preferably, in the step S2, the permanent magnetic stirrer adopts a pair of nd-fe-b permanent magnets arranged in NS, the radian of the magnets is 60 to 120 °, the central magnetic induction intensity is not less than 700Gs when the stirrer is stationary, the rotating speed of the permanent magnets is not less than 50rpm when the stirrer is used, and the rotating direction is one of a clockwise rotation mode, an anticlockwise rotation mode or a clockwise and anticlockwise alternate rotation mode.
According to another aspect of the invention, the invention provides the following technical scheme:
the high-carbon chromium martensite stainless steel is prepared by adopting the method. By carrying out permanent magnetic stirring within a proper time range in the solidification process, the formation and growth of a solidification structure and a liquated carbide are effectively controlled. The main action principle of the permanent magnetic stirring is as follows: the liquated carbide is the result of continuous enrichment of carbide forming elements in the residual liquid phase at the dendritic crystal gap at the solidification front in the molten steel solidification process, and the control of the liquated carbide is the control of the segregation of the carbide forming elements among the dendritic crystals of the solidification structure from the source. The mechanism of refining the liquated carbide by permanent magnetic stirring is that the shear strength of the permanent magnetic stirring to the molten steel is high, convection can be enhanced in the solidification process, dendritic crystal structures at the solidification front are effectively broken up, and the components of the molten steel at the solidification front uniformly inhibit the carbide from forming element segregation, so that the precipitation and growth of the liquated carbide are inhibited.
The technical solution of the present invention is further illustrated by the following specific examples.
Example 1
A method for refining high-carbon chromium martensite stainless steel precipitated carbide comprises the following steps:
s1, remelting
Preparing raw materials for smelting and preparing a high-carbon chromium martensite stainless steel base material according to chemical element composition, wherein the raw materials comprise the following components: 1.05wt% of C, 14.59wt% of Cr, 0.36wt% of Si, 0.33wt% of Mn, 0.99wt% of Mo, 0.21wt% of V, 1.47wt% of Co, 0.18wt% of Ni and the balance of Fe; the smelting process adopts argon protection. Remelting the high-carbon chromium martensite stainless steel parent metal with qualified components in an induction furnace, wherein argon is adopted for protection in the remelting process.
S2, solidifying and stirring by permanent magnet
Before solidification, the temperature of the high-carbon chromium martensite stainless steel liquid is controlled to be 39 ℃ of superheat degree. The cooling speed in the solidification process is controlled to be 6 ℃/min, the refining of liquated carbide is realized by carrying out permanent magnetic stirring on the high-carbon chromium martensite stainless steel liquid in the solidification process, the time for starting the permanent magnetic stirring is 7min after the cooling starts, and the time for stopping the permanent magnetic stirring is 40min after the cooling starts. The permanent magnetic stirrer adopts a pair of Nd-Fe-B permanent magnets which are distributed in NS, the radian of each magnet is 90 degrees, the central magnetic induction intensity is 1450Gs, the rotating speed of each permanent magnet is 150rpm during stirring, and the rotating direction is clockwise. FIG. 1 is a graph of the morphology of the liquated carbides in the high carbon chromium martensitic stainless steel of example 1.
Example 2
A method for refining high-carbon chromium martensite stainless steel precipitated carbide comprises the following steps:
s1, remelting
Preparing raw materials for smelting and preparing a high-carbon chromium martensite stainless steel base material according to chemical element composition, wherein the raw materials comprise the following components: 1.05wt% of C, 14.59wt% of Cr, 0.36wt% of Si, 0.33wt% of Mn, 0.99wt% of Mo, 0.21wt% of V, 1.47wt% of Co, 0.18wt% of Ni and the balance of Fe; the smelting process adopts argon protection. Remelting the high-carbon chromium martensite stainless steel parent metal with qualified components in an induction furnace, wherein argon is adopted for protection in the remelting process.
S2, solidifying and stirring by permanent magnet
Before solidification, the temperature of the high-carbon chromium martensite stainless steel liquid is controlled to be 49 ℃ of superheat degree. The cooling speed in the solidification process is controlled to be 6 ℃/min, the refining of the liquated carbide is realized by carrying out permanent magnetic stirring on the high-carbon chromium martensite stainless steel liquid in the solidification process, the time for starting the permanent magnetic stirring is 9min after the cooling starts, and the time for stopping the permanent magnetic stirring is 45min after the cooling starts. The permanent magnetic stirrer adopts a pair of Nd-Fe-B permanent magnets which are distributed in NS, the radian of each magnet is 90 degrees, the central magnetic induction intensity is 1450Gs, the rotating speed of each permanent magnet is 50rpm during stirring, and the rotating direction is clockwise. Figure 2 is a graph of the liquated carbides in the high carbon chromium martensitic stainless steel of example 2.
Comparative example 1
A preparation method of high-carbon chromium martensitic stainless steel comprises the following steps:
s1, remelting
Preparing raw materials for smelting and preparing a high-carbon chromium martensite stainless steel base material according to chemical element composition, wherein the raw materials comprise the following components: 1.05wt% of C, 14.59wt% of Cr, 0.36wt% of Si, 0.33wt% of Mn, 0.99wt% of Mo, 0.21wt% of V, 1.47wt% of Co, 0.18wt% of Ni and the balance of Fe; the smelting process adopts argon protection. Remelting the high-carbon chromium martensite stainless steel parent metal with qualified components in an induction furnace, wherein argon is adopted for protection in the remelting process.
S2, solidifying and stirring by permanent magnet
Before solidification, the temperature of the high-carbon chromium martensite stainless steel liquid is controlled to be 30 ℃ of superheat degree. The cooling speed in the solidification process is controlled to be 6 ℃/min, and permanent magnetic stirring is not carried out in the solidification process. Fig. 3 is a graph of the morphology of the liquated carbides in the high carbon chromium martensitic stainless steel of comparative example 1.
The comparison results of the area ratios of the liquated carbide and the solidification structure in the high-carbon chromium martensitic stainless steel in the embodiment 1, the embodiment 2 and the comparative example 1 are shown in fig. 4, and as can be seen from fig. 1 to 4, the liquated carbide is refined by stirring the high-carbon chromium martensitic stainless steel liquid after remelting with permanent magnets; and the bigger the permanent magnetic stirring rotating speed is, the smaller the size of the liquated carbide is, and under the permanent magnetic stirring action of 150rpm, the area ratio of the liquated carbide to a solidification structure in the high-carbon chromium martensitic stainless steel is reduced by more than 3%, so that the liquated carbide of the high-carbon chromium martensitic stainless steel is obviously refined. The permanent magnetic stirring of the invention carries out physical action in a non-contact way, does not pollute molten steel, and is simple and easy to implement; the device is suitable for controlling the liquated carbides of steel ingots with different sizes, and has the typical advantages of high energy efficiency, low cost, low requirement on cooling water, simple structure, high stirring strength and good carbide refining effect.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A method for refining high-carbon chromium martensite stainless steel precipitated carbide is characterized by comprising the following steps:
s1, remelting
Remelting the high-carbon chromium martensitic stainless steel raw material to obtain high-carbon chromium martensitic stainless steel liquid;
s2, solidifying and stirring by permanent magnet
Carrying out permanent magnetic stirring on the high-carbon chromium martensite stainless steel liquid in the solidification process;
time t for starting permanent magnet stirring start The time t from the cooling of the molten steel to the beginning of the precipitation of the liquated carbide is less than or equal to p ，
Time t for stopping permanent magnet stirring end Not less than the time t at which solidification ends s 。
2. The method according to claim 1, wherein in the step S1, the high-carbon chromium martensitic stainless steel raw material is a high-carbon chromium martensitic stainless steel base material which is obtained by smelting raw materials for preparing qualified high-carbon chromium martensitic stainless steel in a vacuum or argon-shielded induction furnace.
3. The method according to claim 1, wherein in step S1, the remelting process is performed under vacuum or argon protection.
4. The method according to claim 1, wherein in the step S2, the superheat degree of the high-carbon chromium martensitic stainless steel liquid before solidification is 20-50 ℃.
5. The method as claimed in claim 1, wherein in step S2, the cooling rate during solidification is greater than or equal to 5 ℃/min.
6. The method as claimed in claim 1, wherein the temperature T at which the liquated carbide begins to be precipitated is calculated based on the composition of the molten steel according to thermodynamic software in step S2 p And temperature T at which solidification ends s 。
7. The method according to claim 6, wherein in the step S2, the temperature T before the molten steel is cooled and solidified is determined according to the temperature T h Temperature T at which liquated carbide of molten steel begins to precipitate p Temperature T at the end of solidification s And setting a cooling rate R, and calculating the time t from the cooling of the molten steel to the beginning of the precipitation of the liquated carbide p And time t at which coagulation ends s ：
8. The method according to claim 7, wherein in step S2, the permanent magnetic stirring is realized by a permanent magnetic stirrer with a hollow barrel-shaped structure, the permanent magnetic stirrer consists of an arc-shaped permanent magnet and an electrically or hydraulically driven permanent magnet rotating mechanism, and the molten steel to be stirred is positioned in the permanent magnetic stirrer.
9. The method according to claim 8, wherein in the step S2, the permanent magnetic stirrer adopts a pair of Nd-Fe-B permanent magnets arranged in NS, the radian of the magnets is 60 to 120 degrees, the central magnetic induction is not less than 700Gs when the magnets are static, the rotating speed of the permanent magnets is not less than 50rpm when the magnets are stirred, and the rotating direction is one of clockwise rotation, anticlockwise rotation or clockwise and anticlockwise alternate rotation.
10. A high carbon chromium martensitic stainless steel produced by the method of any one of claims 1 to 9.
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