CN113604731A - High-mirror-surface corrosion-resistant plastic mold steel and production process thereof - Google Patents
High-mirror-surface corrosion-resistant plastic mold steel and production process thereof Download PDFInfo
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- 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
- C21D1/26—Methods of annealing
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- 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
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
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- 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
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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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention relates to the technical field of die steel, in particular to high-mirror-surface corrosion-resistant plastic die steel and a production process thereof, wherein the plastic die steel comprises the following components in percentage by weight: 0.23-0.31% of C; si: 0.21 to 0.33 percent; mn: 0.53-0.72%; cr: 12.55-13.45%; 0.25 to 0.37 percent of Mo; v: 0.25 to 0.37 percent; ni: 0.43-0.65%; p is less than or equal to 0.01 percent; s is less than or equal to 0.003 percent; cu is less than or equal to 0.10 percent; [H] less than or equal to 1.5 ppm; [ O ] is less than or equal to 15 ppm; the content of [ N ] is less than or equal to 140 ppm; the balance of Fe, the mass ratio of V to Mo is 1: 1, the raw material proportion of the plastic die steel is optimized, the contents of Cr and Ni are controlled to be 12.55-13.45% and 0.43-0.65%, and the mass ratio of V/Mo is controlled to be 1: 1, the obtained plastic die steel has excellent corrosion resistance, the invention shows excellent polishing performance, and the die for manufacturing the steel grade can be polished to 14000 meshes under industrial conditions.
Description
Technical Field
The invention relates to the technical field of die steel, in particular to high-mirror-surface corrosion-resistant plastic die steel and a production process thereof.
Background
The mold industry is a leading industry, called the parent of the industry, is the basis for developing other industries, and is an important mark for measuring the industrial level of a country. In recent years, the rapid development of the die steel industry in China, particularly the development of the plastic industry, promotes the overall development of the level of the plastic die steel industry, but the overall level still has a certain gap with European and American enterprises. The high-mirror surface die steel is a material with higher requirements in plastic dies, is widely applied to the industries of automobiles, mobile phones, household appliances and high-end electronic products, and the die material needs to bear the influence of external factors such as high pressure, corrosion, abrasion and the like, so that the requirements on the comprehensive mechanical properties of the material are higher, the development trend is large-scale and high polishing performance, and higher requirements on the polishing property, the hardness uniformity, the toughness and the like of the die are provided.
At present, more plastic die steels are used, such as P20, 1.2738, NAK80, 1.2343 and the like, the two can be subjected to industrial quenching and tempering heat treatment on blanks (generally modules), the hardness is mostly controlled between 32 and 36HRC, the use hardness is low, and the polishing property and the welding property of the die are poor; the pre-hardening hardness of NAK80 can reach 38-40HRC, but the plasticity and toughness of NAK80 are poor, and the hardness uniformity and hardenability of a large-scale die cannot be effectively ensured; therefore, the development of plastic die steel with high mirror surface and high toughness to replace imported die steel is necessary to improve the die manufacturing level in China.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a high-mirror-surface corrosion-resistant plastic die steel and a production process thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the plastic mold steel with the high mirror surface and the corrosion resistance comprises the following components in percentage by weight: 0.23-0.31% of C; si: 0.21 to 0.33 percent; mn: 0.53-0.72%; cr: 12.55-13.45%; 0.25 to 0.37 percent of Mo; v: 0.25 to 0.37 percent; ni: 0.43-0.65%; p is less than or equal to 0.01 percent; s is less than or equal to 0.003 percent; cu is less than or equal to 0.10 percent; [H] less than or equal to 1.5 ppm; [ O ] is less than or equal to 15 ppm; the content of [ N ] is less than or equal to 140 ppm; the balance of Fe, and the mass ratio of V to Mo is 1: 1.
a production process of high-temperature-resistant and high-toughness plastic mold steel comprises the following steps:
s1 electric furnace smelting, refining, vacuum degassing and secondary vacuum degassing: 0.23-0.31% of C; si: 0.21 to 0.33 percent; mn: 0.53-0.72%; cr: 12.55-13.45%; 0.25 to 0.37 percent of Mo; v: 0.25 to 0.37 percent; ni: 0.43-0.65%; p is less than or equal to 0.01 percent; s is less than or equal to 0.003 percent; cu is less than or equal to 0.10 percent; [H] less than or equal to 1.5 ppm; [ O ] is less than or equal to 15 ppm; the content of [ N ] is less than or equal to 140 ppm; the steel material with the balance of Fe is put into an electric furnace to be smelted into molten steel, the prepared molten steel is put into a refining furnace to be refined, and finally, the molten steel is subjected to vacuum degassing and secondary vacuum degassing treatment in a VD ladle refining furnace;
s2 casting of a Φ 520mm (average diameter) consumable electrode: pouring the molten steel subjected to secondary vacuum degassing treatment in the step S1 into a mold, cooling and molding to obtain a consumable electrode blank with the average diameter of 520mm, and adopting argon protection pouring and using a closed argon protective cover in the pouring process;
s3 annealing: recrystallizing and annealing the consumable electrode blank;
s4 sawing a riser: cutting off a riser and a pouring channel of the consumable electrode blank in the step S3 to obtain a consumable electrode;
and S5 electrode welding: polishing the consumable electrode in the step of S4 until the consumable electrode is seen to be metallic, and then welding the dummy electrode and the consumable electrode;
s6 electroslag remelting of a phi 710mm (mean diameter) ingot: carrying out electroslag remelting on the consumable electrode to obtain a steel ingot;
s7 high-temperature forging homogenization: carrying out high-temperature forging processing on the steel ingot in the step S6 to form a homogenized forging;
s8 spheroidizing annealing after forging: spheroidizing annealing treatment is carried out on the forged piece in the step S7;
and S9 judgment: cutting and sampling the forging in the step S8 for inspection;
s10 ultra-fining treatment: performing superfine treatment on the forged piece in the step S8;
s11 finishing, flaw detection and inspection: carrying out shot blasting after carrying out surface finishing on the forge piece, detecting the internal defect of the forge piece through UT, and finally carrying out physical and chemical inspection and size inspection on the forge piece;
and S12 storage: and warehousing and registering after the inspection is qualified.
Preferably, in the electric furnace smelting step of S1:
s101, controlling the oxygen pressure to be 0.46-0.52 MPa in the melting period of the steel material, keeping the temperature to be more than or equal to 1560 ℃, sampling and analyzing, and matching [ Ni ] and [ Mo ] to the lower limit;
controlling the oxygen pressure at 0.58-0.72 Mpa in the S102 oxidation period, and blowing oxygen to oxidize, decarbonize and dephosphorize;
s103, when the conditions that the temperature is more than 1650 ℃ and the phosphorus content is less than or equal to 0.001 percent are met, slag drawing is carried out;
s104 thin slag charge 299kg CaO and 79kg CaF2Pushing slag and melting uniformly;
s105, opening an electric furnace body and adding FeCr;
s106, blowing chromium oxide, wherein the oxygen pressure is required to be more than or equal to 0.95 MPa;
s107 pre-reduction: 3.4-5.6kg/t steel of Fe-Si powder is floated in until the slag turns color and becomes thin;
0.59kg/t of Al is inserted into S108, and 525kg of CaO and 108kg of CaF are supplemented with thin slag2C-Si powder and C-Al powder are added into the slag to be reduced to produce white slag respectively at 3.5-6.0 kg/t;
s109, adjusting the contents of [ C ], [ Mn ], [ Cr ], [ Mo ], [ Ni ];
and S110, when the temperature is higher than or equal to 1620 ℃, turning white slag, adding the alloy for more than or equal to 9.5 minutes, and tapping after 1.5kg/t of Al is added into a ladle.
Preferably, in the refining step of S1:
s111 heating refining furnace, and adding 497kg of CaO and 81kg of CaF2Reducing and adjusting a slag system by C-Si powder, wherein the total slag amount is controlled according to 5% of the steel tapping amount;
s112, when the temperature is more than or equal to 1570 ℃ and the slag is white, adding the V adjusting component, and sampling and analyzing;
and S113, when the temperature is more than or equal to 1650 ℃ and the white slag time is more than or equal to 31min, adding 2.5-2.95 kg/t of fire bricks to adjust the fluidity of the slag, and feeding an AL line.
Preferably, in the vacuum degassing and secondary vacuum degassing step of S1: the vacuum degree in the VD ladle refining furnace reaches 69Pa, the vacuum-maintaining time is more than or equal to 15 minutes, the [ H ] is less than or equal to 1.5ppm, the [ N ] is less than or equal to 120ppm, the secondary vacuum degassing treatment is carried out for 12 minutes, and the sedation soft argon-blowing time is 20-40 minutes after the secondary vacuum degassing.
Preferably, the diameter of the dummy electrode is 299mm, the effective height of a welding line between the dummy electrode and the consumable electrode is more than or equal to 35mm, the welding line is welded by adopting an ER50-6 welding wire, the upper end and the lower end of the welding line are respectively provided with an upper arc striking plate and a lower arc striking plate, the lower arc striking plate adopts a Q235 plate with the excircle diameter of 820mm and the thickness of 10mm, the upper arc striking plate adopts a steel plate which is the same as the consumable electrode and has the size of more than or equal to 300 x 300mm and the thickness of more than or equal to 15mm, and the arc striking time is 88 min; feeding when the weight of the consumable electrode reaches 385kg, finishing smelting when the weight of the consumable electrode is 40kg, wherein the melting rate is 8kg/min, and the feeding time is 75-90 min; and (3) cooling: mold cooling is carried out for 95 minutes, and cover covering slow cooling is carried out for less than or equal to 3.8 days; cooling, removing the cover and cutting off the arc striking plate.
Preferably, the liquidus temperature in the S2 is 1485 ℃, the mold temperature of the mold is controlled to be 40-60 ℃, and the casting superheat degree is controlled to be 45-55 ℃.
The invention has the beneficial effects that: in the invention, the raw material proportion of the plastic mold steel is optimized, the hardness and uniformity of the mold steel are ensured, the content of elements such as C, Mn, Cr, Si, V, Mo and Ni is limited in a precise regulation range in the steps of electric furnace smelting, refining, vacuum degassing and secondary vacuum degassing, and the content of H, O, N gas elements in molten steel is further reduced by vacuum degassing and secondary vacuum degassing; controlling the content of Cr and Ni to be 12.55-13.45% and 0.43-0.65%, and simultaneously controlling the mass ratio of V/Mo to be 1: 1, the obtained plastic die steel has excellent corrosion resistance, Cr is used as an antioxidant element to act together with the acid-base corrosion resistance of Ni, so that the plastic die steel with good corrosion resistance can be obtained, in addition, the content of Si is kept between 0.21 and 0.33 percent, and the combination of Si and Cr can further improve the oxidation resistance and the corrosion resistance of the plastic die steel, and simultaneously improve the elasticity and the toughness of the plastic die steel to a certain degree.
Drawings
FIG. 1 is a block flow diagram of the production process of the present invention.
Detailed Description
The following are specific examples of the present invention and illustrate the technical solutions of the present invention for further description, but the present invention is not limited to these examples.
Examples 1 to 3, wherein the plastic mold steel consists of the following components in percentage by weight: 0.23-0.31% of C; si: 0.21 to 0.33 percent; mn: 0.53-0.72%; cr: 12.55-13.45%; 0.25 to 0.37 percent of Mo; v: 0.25 to 0.37 percent; ni: 0.43-0.65%; p is less than or equal to 0.01 percent; s is less than or equal to 0.003 percent; cu is less than or equal to 0.10 percent; [H] less than or equal to 1.5 ppm; [ O ] is less than or equal to 15 ppm; the content of [ N ] is less than or equal to 140 ppm; the balance of Fe, the mass ratio of V to Mo is 1: 1.
the material composition in examples 1-3 is shown in table 1:
table 1: material composition
The production process of example 1, comprising the steps of:
s1 electric furnace smelting, refining, vacuum degassing and secondary vacuum degassing: taking steel materials of the material components of example 1 in the table 1, putting the steel materials into an electric furnace to smelt into molten steel, putting the prepared molten steel into a refining furnace to refine, and finally carrying out vacuum degassing and secondary vacuum degassing treatment on the molten steel in a VD ladle refining furnace;
in the electric furnace smelting step of S1: s101, controlling the oxygen pressure to be 0.46-0.52 MPa in the melting period of the steel material, keeping the temperature to be more than or equal to 1560 ℃, sampling and analyzing, and matching [ Ni ] and [ Mo ] to the lower limit;
controlling the oxygen pressure at 0.58-0.72 Mpa in the S102 oxidation period, and blowing oxygen to oxidize, decarbonize and dephosphorize;
s103, when the conditions that the temperature is more than 1650 ℃ and the phosphorus content is less than or equal to 0.001 percent are met, slag drawing is carried out;
s104 thin slag charge 299kg CaO and 79kg CaF2Pushing slag and melting uniformly;
s105, opening an electric furnace body and adding FeCr;
s106, blowing chromium oxide, wherein the oxygen pressure is required to be more than or equal to 0.95 MPa;
s107 pre-reduction: 3.4-5.6kg/t steel of Fe-Si powder is floated in until the slag turns color and becomes thin;
0.59kg/t of Al is inserted into S108, and 525kg of CaO and 108kg of CaF are supplemented with thin slag2C-Si powder and C-Al powder are added into the slag to be reduced to produce white slag respectively at 3.5-6.0 kg/t;
s109, adjusting the contents of [ C ], [ Mn ], [ Cr ], [ Mo ], [ Ni ];
s110, when the temperature is higher than or equal to 1620 ℃, the slag condition is turned white, the alloy adding time is higher than or equal to 9.5 minutes, and steel is tapped after Al is added into a steel ladle at a rate of 1.5 kg/t;
in the refining step of S1: s111 heating refining furnace, and adding 497kg of CaO and 81kg of CaF2Reducing and adjusting a slag system by C-Si powder, wherein the total slag amount is controlled according to 5% of the steel tapping amount;
s112, when the temperature is more than or equal to 1570 ℃ and the slag is white, adding the V adjusting component, and sampling and analyzing;
s113, when the temperature is more than or equal to 1650 ℃ and the white slag time is more than or equal to 31min, adding 2.5-2.95 kg/t of fire bricks to adjust the fluidity of the slag, and feeding AL lines;
in the vacuum degassing and secondary vacuum degassing step of S1: the vacuum degree in the VD ladle refining furnace reaches 69Pa, the vacuum-maintaining time is more than or equal to 15 minutes, the [ H ] is less than or equal to 1.5ppm, the [ N ] is less than or equal to 120ppm, the secondary vacuum degassing treatment is carried out for 12 minutes, and the sedation soft argon blowing time is 20-40 minutes after the secondary vacuum degassing;
s2 casting of a Φ 520mm (average diameter) consumable electrode: pouring the molten steel subjected to secondary vacuum degassing treatment in the step S1 into a mold, cooling and forming to obtain a consumable electrode blank with the average diameter of 520mm, adopting argon protection pouring and using a closed argon protection cover in the pouring process, wherein the liquidus temperature is 1485 ℃, the mold temperature of the mold is controlled to be 40-60 ℃, and the pouring superheat degree is controlled to be 45-55 ℃;
s3 annealing: recrystallizing and annealing the consumable electrode blank;
s4 sawing a riser: cutting off a riser and a pouring channel of the consumable electrode blank in the step S3 to obtain a consumable electrode;
and S5 electrode welding: polishing the consumable electrode in the step of S4 until the consumable electrode is seen to be metallic, and then welding the dummy electrode and the consumable electrode; the diameter of the dummy electrode is 299mm, the effective height of a welding line between the dummy electrode and the consumable electrode is more than or equal to 35mm, the welding line is welded by adopting an ER50-6 welding wire, the upper end and the lower end of the welding line are respectively provided with an upper arc striking plate and a lower arc striking plate, the lower arc striking plate adopts a Q235 plate with the excircle diameter of 820mm and the thickness of 10mm, the upper arc striking plate adopts a steel plate which is the same as the consumable electrode and has the size of more than or equal to 300 x 300mm and the thickness of more than or equal to 15mm, and the arc striking time is 88 min; feeding when the weight of the consumable electrode reaches 385kg, finishing smelting when the weight of the consumable electrode is 40kg, wherein the melting rate is 8kg/min, and the feeding time is 75-90 min; and (3) cooling: mold cooling is carried out for 95 minutes, and cover covering slow cooling is carried out for less than or equal to 3.8 days; cooling, then removing the cover and cutting off the arc striking plate;
s6 electroslag remelting of a phi 710mm (mean diameter) ingot: carrying out electroslag remelting on the consumable electrode to obtain a steel ingot;
s7 high-temperature forging homogenization: carrying out high-temperature forging processing on the steel ingot in the step S6 to form a homogenized forging;
s8 spheroidizing annealing after forging: spheroidizing annealing treatment is carried out on the forged piece in the step S7;
and S9 judgment: cutting and sampling the forging in the step S8 for inspection;
s10 ultra-fining treatment: performing superfine treatment on the forged piece in the step S8;
s11 finishing, flaw detection and inspection: carrying out shot blasting after carrying out surface finishing on the forge piece, detecting the internal defect of the forge piece through UT, and finally carrying out physical and chemical inspection and size inspection on the forge piece;
and S12 storage: and warehousing and registering after the inspection is qualified.
The production processes of example 2 and example 3 are similar to those of example 1.
Performance testing
Samples of the plastic mold steel of example 1, example 2, example 3 and commercial 40Cr13 were taken for hardness and corrosion rate performance testing, wherein the salt spray corrosion test: the corrosion rate of the sample is measured by spraying 5% NaCl aqueous solution for 72 hours; and (3) hardness testing: carrying out Rockwell hardness test on the thickness section of the sample according to GB/T230.1; the results are as follows:
table 2: examples 1-3 part of the results of the Performance test
The die steel produced by the invention can be polished to 14000 meshes under industrial conditions, the corrosion rate is below 0.53g/m2 h, the die steel is superior to the commercially available corrosion-resistant plastic die steel 40Cr13, the hardness value is equivalent to the corrosion-resistant plastic die steel 40Cr13, and the die steel has excellent corrosion resistance and surface performance.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The high-mirror-surface corrosion-resistant plastic mold steel is characterized by comprising the following components in percentage by weight: 0.23-0.31% of C; si: 0.21 to 0.33 percent; mn: 0.53-0.72%; cr: 12.55-13.45%; 0.25 to 0.37 percent of Mo; v: 0.25 to 0.37 percent; ni: 0.43-0.65%; p is less than or equal to 0.01 percent; s is less than or equal to 0.003 percent; cu is less than or equal to 0.10 percent; [H] less than or equal to 1.5 ppm; [ O ] is less than or equal to 15 ppm; the content of [ N ] is less than or equal to 140 ppm; the balance of Fe, and the mass ratio of V to Mo is 1: 1.
2. a process for producing a high temperature resistant and high toughness plastic mold steel according to claim 1, comprising the steps of:
s1 electric furnace smelting, refining, vacuum degassing and secondary vacuum degassing: 0.23-0.31% of C; si: 0.21 to 0.33 percent; mn: 0.53-0.72%; cr: 12.55-13.45%; 0.25 to 0.37 percent of Mo; v: 0.25 to 0.37 percent; ni: 0.43-0.65%; p is less than or equal to 0.01 percent; s is less than or equal to 0.003 percent; cu is less than or equal to 0.10 percent; [H] less than or equal to 1.5 ppm; [ O ] is less than or equal to 15 ppm; the content of [ N ] is less than or equal to 140 ppm; the steel material with the balance of Fe is put into an electric furnace to be smelted into molten steel, the prepared molten steel is put into a refining furnace to be refined, and finally, the molten steel is subjected to vacuum degassing and secondary vacuum degassing treatment in a VD ladle refining furnace;
s2 casting of a Φ 520mm (average diameter) consumable electrode: pouring the molten steel subjected to secondary vacuum degassing treatment in the step S1 into a mold, cooling and molding to obtain a consumable electrode blank with the average diameter of 520mm, and adopting argon protection pouring and using a closed argon protective cover in the pouring process;
s3 annealing: recrystallizing and annealing the consumable electrode blank;
s4 sawing a riser: cutting off a riser and a pouring channel of the consumable electrode blank in the step S3 to obtain a consumable electrode;
and S5 electrode welding: polishing the consumable electrode in the step of S4 until the consumable electrode is seen to be metallic, and then welding the dummy electrode and the consumable electrode;
s6 electroslag remelting of a phi 710mm (mean diameter) ingot: carrying out electroslag remelting on the consumable electrode to obtain a steel ingot;
s7 high-temperature forging homogenization: carrying out high-temperature forging processing on the steel ingot in the step S6 to form a homogenized forging;
s8 spheroidizing annealing after forging: spheroidizing annealing treatment is carried out on the forged piece in the step S7;
and S9 judgment: cutting and sampling the forging in the step S8 for inspection;
s10 ultra-fining treatment: performing superfine treatment on the forged piece in the step S8;
s11 finishing, flaw detection and inspection: carrying out shot blasting after carrying out surface finishing on the forge piece, detecting the internal defect of the forge piece through UT, and finally carrying out physical and chemical inspection and size inspection on the forge piece;
and S12 storage: and warehousing and registering after the inspection is qualified.
3. The process for producing a plastic mold steel with a high mirror surface and corrosion resistance as claimed in claim 2, wherein in the step of electric furnace smelting of S1:
s101, controlling the oxygen pressure to be 0.46-0.52 MPa in the melting period of the steel material, keeping the temperature to be more than or equal to 1560 ℃, sampling and analyzing, and matching [ Ni ] and [ Mo ] to the lower limit;
controlling the oxygen pressure at 0.58-0.72 Mpa in the S102 oxidation period, and blowing oxygen to oxidize, decarbonize and dephosphorize;
s103, when the conditions that the temperature is more than 1650 ℃ and the phosphorus content is less than or equal to 0.001 percent are met, slag drawing is carried out;
s104 thin slag charge 299kg CaO and 79kg CaF2Pushing slag and melting uniformly;
s105, opening an electric furnace body and adding FeCr;
s106, blowing chromium oxide, wherein the oxygen pressure is required to be more than or equal to 0.95 MPa;
s107 pre-reduction: 3.4-5.6kg/t steel of Fe-Si powder is floated in until the slag turns color and becomes thin;
0.59kg/t of Al is inserted into S108, and 525kg of CaO and 108kg of CaF are supplemented with thin slag2C-Si powder and C-Al powder are added into the slag to be reduced to produce white slag respectively at 3.5-6.0 kg/t;
s109, adjusting the contents of [ C ], [ Mn ], [ Cr ], [ Mo ], [ Ni ];
and S110, when the temperature is higher than or equal to 1620 ℃, turning white slag, adding the alloy for more than or equal to 9.5 minutes, and tapping after 1.5kg/t of Al is added into a ladle.
4. The process for producing a plastic mold steel with high mirror surface and corrosion resistance as claimed in claim 2, wherein the refining step of S1 is:
s111 heatingAdding 497kg of CaO and 81kg of CaF into the refining furnace2Reducing and adjusting a slag system by C-Si powder, wherein the total slag amount is controlled according to 5% of the steel tapping amount;
s112, when the temperature is more than or equal to 1570 ℃ and the slag is white, adding the V adjusting component, and sampling and analyzing;
and S113, when the temperature is more than or equal to 1650 ℃ and the white slag time is more than or equal to 31min, adding 2.5-2.95 kg/t of fire bricks to adjust the fluidity of the slag, and feeding an AL line.
5. The process for producing a plastic mold steel with high mirror surface and corrosion resistance as claimed in claim 2, wherein the vacuum degassing and secondary vacuum degassing step of S1 comprises: the vacuum degree in the VD ladle refining furnace reaches 69Pa, the vacuum-maintaining time is more than or equal to 15 minutes, the [ H ] is less than or equal to 1.5ppm, the [ N ] is less than or equal to 120ppm, the secondary vacuum degassing treatment is carried out for 12 minutes, and the sedation soft argon-blowing time is 20-40 minutes after the secondary vacuum degassing.
6. The process for producing a high mirror surface and corrosion resistant plastic mold steel as claimed in claim 2, wherein: the diameter of the false electrode is 299mm, the effective height of a welding line between the false electrode and the consumable electrode is more than or equal to 35mm, the welding line is welded by adopting an ER50-6 welding wire, the upper end and the lower end of the welding line are respectively provided with an upper arc striking plate and a lower arc striking plate, the lower arc striking plate adopts a Q235 plate with the excircle diameter of 820mm and the thickness of 10mm, the upper arc striking plate adopts a steel plate which is the same as the consumable electrode and has the size of more than or equal to 300 x 300mm and the thickness of more than or equal to 15mm, and the arc striking time is 88 min; feeding when the weight of the consumable electrode reaches 385kg, finishing smelting when the weight of the consumable electrode is 40kg, wherein the melting rate is 8kg/min, and the feeding time is 75-90 min; and (3) cooling: mold cooling is carried out for 95 minutes, and cover covering slow cooling is carried out for less than or equal to 3.8 days; cooling, removing the cover and cutting off the arc striking plate.
7. The process for producing a high mirror surface and corrosion resistant plastic mold steel as claimed in claim 2, wherein: the liquidus temperature in the S2 is 1485 ℃, the mold temperature of the mold is controlled to be 40-60 ℃, and the casting superheat degree is controlled to be 45-55 ℃.
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