CN112195414A - Preparation method of corrosion-resistant stainless steel material for distribution box - Google Patents
Preparation method of corrosion-resistant stainless steel material for distribution box Download PDFInfo
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- CN112195414A CN112195414A CN202011128500.5A CN202011128500A CN112195414A CN 112195414 A CN112195414 A CN 112195414A CN 202011128500 A CN202011128500 A CN 202011128500A CN 112195414 A CN112195414 A CN 112195414A
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/40—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
Abstract
The invention discloses a preparation method of a corrosion-resistant stainless steel material for a distribution box; the method comprises the following steps of mixing austenitic stainless steel, metal chromium, ferromolybdenum, nano-silica, cerium iron and metal nickel, adding the mixture into a medium-frequency induction furnace, smelting, pouring, cooling and forming to obtain a blank plate; carrying out primary heat treatment at the temperature of 1000-; the corrosion-resistant stainless steel material for the distribution box prepared by the method has excellent mechanical property and corrosion resistance, and the protection effect of the distribution box on the normal work of the distribution box can be better improved, the corrosion effect of an external medium on the distribution box is reduced, and the service life of the distribution box is greatly prolonged.
Description
Technical Field
The invention belongs to the technical field of cast iron, and particularly relates to a preparation method of a corrosion-resistant stainless steel material for a distribution box.
Background
The distribution box, i.e. the distribution cabinet, is the final stage equipment of the distribution system. The distribution box is a general name of a motor control center. The distribution box is a mass parameter on data, generally forms a low-voltage forest according to electrical wiring, and requires that a switch device, a measuring instrument, a protective electrical appliance and an auxiliary device are assembled in a closed or semi-closed metal cabinet or on a screen to form the low-voltage distribution box. In normal operation, the circuit can be switched on or off by means of a manual or automatic switch. The distribution box has the characteristics of small volume, simple and convenient installation, special technical performance, fixed position, unique configuration function, no field limitation, universal application, stable and reliable operation, high space utilization rate, less occupied area and environmental protection effect.
The distribution box is a general name of a power control center and is a final-stage device of a power distribution system. Among the prior art, the vast majority block terminal is formed by the iron sheet preparation, when installing in the open air, need bear direct solar radiation and rainwater impact, easily causes the surface corrosion, simultaneously, because iron sheet mechanical properties is more weak, has restricted its use.
Therefore, there is a need to improve the material used in the distribution box, improve the corrosion resistance of the distribution box, and further prolong the service life of the distribution box.
Disclosure of Invention
The invention aims to provide a preparation method of a corrosion-resistant stainless steel material for a distribution box, and aims to overcome the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a preparation method of a corrosion-resistant stainless steel material for a distribution box comprises the steps of mixing austenitic stainless steel, chromium metal, ferromolybdenum, nano-silica, cerium iron and nickel metal, adding the mixture into a medium-frequency induction furnace for smelting, and then carrying out pouring, cooling and forming to obtain a blank plate;
carrying out primary heat treatment at the temperature of 1000-;
and passivating the heat-treated part by using nitric acid to obtain a passivated part.
The blank comprises the following chemical components in percentage by mass:
0.015-0.016% of carbon, 0.60-0.68% of silicon, 0.60-0.68% of manganese, 0.026-0.029% of phosphorus, 0.015-0.018% of sulfur, 7.21-7.83% of nickel, 28.84-31.32% of chromium, 1.3-1.7% of molybdenum, 0.42-0.49% of nitrogen, 0.006-0.0068% of cerium and the balance of iron.
The mass ratio of silicon to manganese is 1: 1;
the mass ratio of the chromium to the nickel is 4: 1;
the mass ratio of silicon to cerium is 100: 1.
The casting temperature is 1420-.
The primary heat treatment time is 40-50 min;
the primary heat treatment atmosphere is an air atmosphere.
The secondary heat treatment time is 2-2.5 hours;
and the secondary heat treatment atmosphere is helium atmosphere.
The nitric acid passivation treatment comprises the following steps:
adding sodium molybdate and lanthanum nitrate into a nitric acid solution, and uniformly stirring to obtain a treatment solution;
and adding the heat treatment piece into the treatment liquid for passivation for 1-2min, taking out, washing with clear water to be neutral, and drying to constant weight.
The mass fraction of the nitric acid solution is 5-6%;
the mixing mass ratio of the sodium molybdate to the lanthanum nitrate to the nitric acid solution is 1-2:0.03-0.05: 80-90.
The passivation temperature is 50-55 ℃.
According to the invention, a certain amount of chromium element is introduced, and a compact and stable chromium oxide film can be formed on the surface of the substrate by the chromium element in the heat treatment process, and the film can play a role in organizing the continuous contact corrosion between an external medium and the substrate, so that the substrate is protected. The invention also introduces a certain amount of nickel element, when the nickel element and the elements exist in a certain mass ratio, a specific mechanism can occur, the action mechanism of the nickel element is greatly changed, because the ferrite stainless steel has slight defects in mechanical property, the nickel element is dispersed more uniformly by two times of heat treatment, meanwhile, the nickel element can synergistically promote the sufficient dissolution of the nickel element, change the crystal structure of the steel and promote the formation of an austenite crystal structure, thereby improving the plasticity, the weldability and the toughness.
By introducing certain mass of molybdenum element and cerium element, the strengthening effect of a stainless steel matrix can be promoted, the high-temperature strength and the creep property of the stainless steel can be greatly improved, meanwhile, the stabilizing effect of the passivation film is promoted, the corrosion resistance of the passivation film is further improved, and particularly the corrosion resistance to chloride ions is obvious.
Has the advantages that:
the corrosion-resistant stainless steel material for the distribution box prepared by the method has excellent mechanical property and corrosion resistance, and the distribution box made of the stainless steel material prepared by the method can better improve the protection effect on the normal work of the distribution box and reduce the corrosion effect of an external medium on the distribution box, so that the service life of the distribution box is greatly prolonged.
Detailed Description
A preparation method of a corrosion-resistant stainless steel material for a distribution box comprises the steps of mixing austenitic stainless steel, chromium metal, ferromolybdenum, nano-silica, cerium iron and nickel metal, adding the mixture into a medium-frequency induction furnace for smelting, and then carrying out pouring, cooling and forming to obtain a blank plate;
carrying out primary heat treatment at the temperature of 1000-;
and passivating the heat-treated part by using nitric acid to obtain a passivated part.
The blank comprises the following chemical components in percentage by mass:
0.015-0.016% of carbon, 0.60-0.68% of silicon, 0.60-0.68% of manganese, 0.026-0.029% of phosphorus, 0.015-0.018% of sulfur, 7.21-7.83% of nickel, 28.84-31.32% of chromium, 1.3-1.7% of molybdenum, 0.42-0.49% of nitrogen, 0.006-0.0068% of cerium and the balance of iron.
The mass ratio of silicon to manganese is 1: 1;
the mass ratio of the chromium to the nickel is 4: 1;
the mass ratio of silicon to cerium is 100: 1.
The casting temperature is 1420-.
The primary heat treatment time is 40-50 min;
the primary heat treatment atmosphere is an air atmosphere.
The secondary heat treatment time is 2-2.5 hours;
and the secondary heat treatment atmosphere is helium atmosphere.
The nitric acid passivation treatment comprises the following steps:
adding sodium molybdate and lanthanum nitrate into a nitric acid solution, and uniformly stirring to obtain a treatment solution;
and adding the heat treatment piece into the treatment liquid for passivation for 1-2min, taking out, washing with clear water to be neutral, and drying to constant weight.
The mass fraction of the nitric acid solution is 5-6%;
the mixing mass ratio of the sodium molybdate to the lanthanum nitrate to the nitric acid solution is 1-2:0.03-0.05: 80-90.
Sodium molybdate: white crystalline powder. 2 molecules of crystal water are lost at 100 ℃. Dissolving in 1.7 parts of cold water and about 0.9 part of boiling water, wherein the pH of the 5% aqueous solution is 9.0-10.0 at 25 ℃. The relative density (d184) was 3.28. Melting point 687 ℃. Half of the lethal dose (mouse, abdominal cavity) was 344 mg/kg. Has irritation.
The passivation temperature is 50-55 ℃.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, 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.
Example 1
A preparation method of a corrosion-resistant stainless steel material for a distribution box comprises the steps of mixing austenitic stainless steel, chromium metal, ferromolybdenum, nano-silica, cerium iron and nickel metal, adding the mixture into a medium-frequency induction furnace for smelting, and then carrying out pouring, cooling and forming to obtain a blank plate; carrying out primary heat treatment on the blank plate at 1000 ℃, adjusting the temperature to 600 ℃, carrying out secondary heat treatment, and then air-cooling to room temperature to obtain a heat-treated piece; and passivating the heat-treated part by using nitric acid to obtain a passivated part. The blank comprises the following chemical components in percentage by mass: 0.015% of carbon, 0.60% of silicon, 0.60% of manganese, 0.026% of phosphorus, 0.015% of sulfur, 7.21% of nickel, 28.84% of chromium, 1.3% of molybdenum, 0.42% of nitrogen, 0.006% of cerium and the balance of iron. The mass ratio of silicon to manganese is 1: 1; the mass ratio of the chromium to the nickel is 4: 1; the mass ratio of silicon to cerium is 100: 1. The casting temperature was 1420 ℃. The primary heat treatment time is 40 min; the primary heat treatment atmosphere is an air atmosphere. The secondary heat treatment time is 2 hours; and the secondary heat treatment atmosphere is helium atmosphere. The nitric acid passivation treatment comprises the following steps: adding sodium molybdate and lanthanum nitrate into a nitric acid solution, and uniformly stirring to obtain a treatment solution; and adding the heat treatment piece into the treatment liquid for passivation for 1min, taking out, washing with clear water to be neutral, and drying to constant weight. The mass fraction of the nitric acid solution is 5 percent; the mixing mass ratio of the sodium molybdate to the lanthanum nitrate to the nitric acid solution is 1:0.03: 80. The passivation temperature was 50 ℃.
Example 2
A preparation method of a corrosion-resistant stainless steel material for a distribution box comprises the steps of mixing austenitic stainless steel, chromium metal, ferromolybdenum, nano-silica, cerium iron and nickel metal, adding the mixture into a medium-frequency induction furnace for smelting, and then carrying out pouring, cooling and forming to obtain a blank plate; carrying out primary heat treatment at 1120 ℃ on the blank plate, adjusting the temperature to 620 ℃, carrying out secondary heat treatment, and then air-cooling to room temperature to obtain a heat-treated piece; and passivating the heat-treated part by using nitric acid to obtain a passivated part. The blank comprises the following chemical components in percentage by mass: 0.016% of carbon, 0.68% of silicon, 0.68% of manganese, 0.029% of phosphorus, 0.018% of sulfur, 7.83% of nickel, 31.32% of chromium, 1.7% of molybdenum, 0.49% of nitrogen, 0.0068% of cerium and the balance of iron. The mass ratio of silicon to manganese is 1: 1; the mass ratio of the chromium to the nickel is 4: 1; the mass ratio of silicon to cerium is 100: 1. The casting temperature is 1465 ℃. The primary heat treatment time is 50 min; the primary heat treatment atmosphere is an air atmosphere. The time of the secondary heat treatment is 2.5 hours; and the secondary heat treatment atmosphere is helium atmosphere. The nitric acid passivation treatment comprises the following steps: adding sodium molybdate and lanthanum nitrate into a nitric acid solution, and uniformly stirring to obtain a treatment solution; and adding the heat treatment piece into the treatment liquid for passivation for 2min, taking out, washing with clear water to be neutral, and drying to constant weight. The mass fraction of the nitric acid solution is 6 percent; the mixing mass ratio of the sodium molybdate to the lanthanum nitrate to the nitric acid solution is 2:0.05: 90. The passivation temperature was 55 ℃.
Example 3
A preparation method of a corrosion-resistant stainless steel material for a distribution box comprises the steps of mixing austenitic stainless steel, chromium metal, ferromolybdenum, nano-silica, cerium iron and nickel metal, adding the mixture into a medium-frequency induction furnace for smelting, and then carrying out pouring, cooling and forming to obtain a blank plate; carrying out primary heat treatment on the blank plate at 1030 ℃, adjusting the temperature to 612 ℃, carrying out secondary heat treatment, and then air-cooling to room temperature to obtain a heat-treated piece; and passivating the heat-treated part by using nitric acid to obtain a passivated part. The blank comprises the following chemical components in percentage by mass: 0.0152% of carbon, 0.66% of silicon, 0.66% of manganese, 0.028% of phosphorus, 0.016% of sulfur, 7.25% of nickel, 29% of chromium, 1.6% of molybdenum, 0.44% of nitrogen, 0.0066% of cerium and the balance of iron. The mass ratio of silicon to manganese is 1: 1; the mass ratio of the chromium to the nickel is 4: 1; the mass ratio of silicon to cerium is 100: 1. The casting temperature was 1450 ℃. The primary heat treatment time is 45 min; the primary heat treatment atmosphere is an air atmosphere. The time of the secondary heat treatment is 2.3 hours; and the secondary heat treatment atmosphere is helium atmosphere. The nitric acid passivation treatment comprises the following steps: adding sodium molybdate and lanthanum nitrate into a nitric acid solution, and uniformly stirring to obtain a treatment solution; and adding the heat treatment piece into the treatment liquid for passivation for 1.8min, taking out, washing with clear water to be neutral, and drying to constant weight. The mass fraction of the nitric acid solution is 5.2%; the mixing mass ratio of the sodium molybdate to the lanthanum nitrate to the nitric acid solution is 1.7:0.036: 83. The passivation temperature was 51 ℃.
Example 4
A preparation method of a corrosion-resistant stainless steel material for a distribution box comprises the steps of mixing austenitic stainless steel, chromium metal, ferromolybdenum, nano-silica, cerium iron and nickel metal, adding the mixture into a medium-frequency induction furnace for smelting, and then carrying out pouring, cooling and forming to obtain a blank plate; carrying out primary heat treatment at 1070 ℃ on the blank plate, adjusting the temperature to 610 ℃, carrying out secondary heat treatment, and then air-cooling to room temperature to obtain a heat-treated piece; and passivating the heat-treated part by using nitric acid to obtain a passivated part. The blank comprises the following chemical components in percentage by mass: 0.0155% of carbon, 0.62% of silicon, 0.62% of manganese, 0.028% of phosphorus, 0.016% of sulfur, 7.36% of nickel, 29.44% of chromium, 1.5% of molybdenum, 0.45% of nitrogen, 0.0062% of cerium and the balance of iron. The mass ratio of silicon to manganese is 1: 1; the mass ratio of the chromium to the nickel is 4: 1; the mass ratio of silicon to cerium is 100: 1. The casting temperature was 1435 ℃. The primary heat treatment time is 44 min; the primary heat treatment atmosphere is an air atmosphere. The time of the secondary heat treatment is 2.2 hours; and the secondary heat treatment atmosphere is helium atmosphere. The nitric acid passivation treatment comprises the following steps: adding sodium molybdate and lanthanum nitrate into a nitric acid solution, and uniformly stirring to obtain a treatment solution; and adding the heat treatment piece into the treatment liquid for passivation for 1.5min, taking out, washing with clear water to be neutral, and drying to constant weight. The mass fraction of the nitric acid solution is 5.2%; the mixing mass ratio of the sodium molybdate to the lanthanum nitrate to the nitric acid solution is 1.4:0.04: 86. The passivation temperature was 52 ℃.
Test of
And (3) hardness detection:
hardness testing is carried out by adopting an HRS-150A hardness tester, 7 hardness points are taken on the surface of each sample (examples and comparative examples), the maximum value and the minimum value are removed, and the average value of the rest 5 samples is taken as an effective hardness value;
TABLE 1
Comparative example 1: the difference from the example 1 is that the cerium element is not added and the secondary heat treatment is not carried out;
as can be seen from Table 1, the stainless steel material prepared by the method of the present invention has excellent surface hardness, and can be applied to a distribution box to better prevent the influence of collision.
Tensile test
Reference is made to ASTM E-8 Standard:
TABLE 2
Comparative example 1: the difference from the example 1 is that the cerium element is not added and the secondary heat treatment is not carried out;
as can be seen from Table 2, the stainless steel material prepared by the method of the present invention has excellent tensile strength.
Corrosion test
Soaking samples of examples and comparative examples in a 10% hydrochloric acid solution for 96 hours, wherein the size of the sample is 20mm multiplied by 3mm, taking out and cleaning the samples every 24 hours, drying and weighing the samples, and calculating the corrosion rate;
TABLE 3
Comparative example 1: the difference from the example 1 is that the cerium element is not added and the secondary heat treatment is not carried out;
as can be seen from Table 3, the corrosion resistance of the stainless steel material prepared by the method of the invention is greatly improved, and particularly, the corrosion rate is obviously reduced.
Continuing the above test, based on example 4, comparing the effect of different mass ratios of silicon and cerium on the corrosion resistance of stainless steel (silicon content is unchanged):
TABLE 4
As can be seen from Table 4, different silicon-cerium ratios have obvious influence on the corrosion resistance of the stainless steel material, and the corrosion resistance of the stainless steel material can be better promoted and improved by adopting the silicon-cerium ratio.
Continuing the above test, based on example 4, the effect of different mass ratios of nickel and chromium on the corrosion resistance of stainless steel was compared (chromium content was unchanged):
TABLE 5
As can be seen from Table 5, different nickel-chromium ratios have obvious influence on the corrosion resistance of the stainless steel material, and the nickel element and the chromium element have obvious synergistic promotion effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.
Claims (9)
1. A preparation method of a corrosion-resistant stainless steel material for a distribution box is characterized in that austenitic stainless steel, metal chromium, ferromolybdenum, nano-silica, cerium iron and metal nickel are mixed and added into a medium-frequency induction furnace to be smelted, and then casting and cooling forming are carried out to obtain a blank plate;
carrying out primary heat treatment at the temperature of 1000-;
and passivating the heat-treated part by using nitric acid to obtain a passivated part.
2. The preparation method of the corrosion-resistant stainless steel material for the distribution box according to claim 1, wherein the corrosion-resistant stainless steel material comprises the following steps: the blank comprises the following chemical components in percentage by mass:
0.015-0.016% of carbon, 0.60-0.68% of silicon, 0.60-0.68% of manganese, 0.026-0.029% of phosphorus, 0.015-0.018% of sulfur, 7.21-7.83% of nickel, 28.84-31.32% of chromium, 1.3-1.7% of molybdenum, 0.42-0.49% of nitrogen, 0.006-0.0068% of cerium and the balance of iron.
3. The preparation method of the corrosion-resistant stainless steel material for the distribution box according to claim 2, wherein the corrosion-resistant stainless steel material comprises the following steps: the mass ratio of silicon to manganese is 1: 1;
the mass ratio of the chromium to the nickel is 4: 1;
the mass ratio of silicon to cerium is 100: 1.
4. The preparation method of the corrosion-resistant stainless steel material for the distribution box according to claim 1, wherein the corrosion-resistant stainless steel material comprises the following steps: the casting temperature is 1420-.
5. The preparation method of the corrosion-resistant stainless steel material for the distribution box according to claim 2, wherein the corrosion-resistant stainless steel material comprises the following steps: the primary heat treatment time is 40-50 min;
the primary heat treatment atmosphere is an air atmosphere.
6. The preparation method of the corrosion-resistant stainless steel material for the distribution box according to claim 1, wherein the corrosion-resistant stainless steel material comprises the following steps: the secondary heat treatment time is 2-2.5 hours;
and the secondary heat treatment atmosphere is helium atmosphere.
7. The preparation method of the corrosion-resistant stainless steel material for the distribution box according to claim 1, wherein the corrosion-resistant stainless steel material comprises the following steps: the nitric acid passivation treatment comprises the following steps:
adding sodium molybdate and lanthanum nitrate into a nitric acid solution, and uniformly stirring to obtain a treatment solution;
and adding the heat treatment piece into the treatment liquid for passivation for 1-2min, taking out, washing with clear water to be neutral, and drying to constant weight.
8. The preparation method of the corrosion-resistant stainless steel material for the distribution box according to claim 7, wherein the corrosion-resistant stainless steel material comprises the following steps: the mass fraction of the nitric acid solution is 5-6%;
the mixing mass ratio of the sodium molybdate to the lanthanum nitrate to the nitric acid solution is 1-2:0.03-0.05: 80-90.
9. The preparation method of the corrosion-resistant stainless steel material for the distribution box according to claim 7, wherein the corrosion-resistant stainless steel material comprises the following steps: the passivation temperature is 50-55 ℃.
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