CN112593166B - Ultrahigh-strength high-toughness alloy structural steel and smelting process thereof - Google Patents
Ultrahigh-strength high-toughness alloy structural steel and smelting process thereof Download PDFInfo
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Abstract
The invention relates to an ultrahigh-strength high-toughness alloy structural steel with a more economic and environment-friendly smelting mode and higher production efficiency and a smelting process thereof, wherein the smelting process comprises the steps of smelting in an electric arc furnace, ladle refining, vacuum degassing and vacuum self-consumption, selecting high-quality waste steel or steel scraps, low-five-harmful-element high-quality pig iron and sponge iron, and controlling the five-harmful elements of raw materials, wherein the ferromolybdenum is put into the electric furnace together with furnace materials; heating in a ladle furnace during refining, adjusting the temperature to be more than or equal to 1550 ℃, adding lime and fluorite to adjust the slag amount, adjusting the alkalinity of the slag, finely adjusting the alloy to enable the components to reach the target components, carrying out vacuum degassing and casting to form an electrode blank or a steel ingot, forging the electrode blank or the steel ingot to form a consumable blank, polishing the surface of the electrode blank or the forged middle blank before vacuum consumable, and achieving the purpose of removing impurities and gas through vacuum and melting speed control; the chemical components meet the design requirements; after heat treatment, the strength grade is more than 1700Mpa, the impact toughness AKU is not less than 64J, and the alloy is applied to the field of ultrahigh-strength and high-toughness materials, such as aerospace.
Description
Technical Field
The invention belongs to the technical field of new material development and smelting thereof, and particularly relates to an ultrahigh-strength high-toughness alloy structural steel with a more economic and environment-friendly smelting mode and higher production efficiency and a smelting process thereof.
Background
At present, the traditional smelting method of the ultrahigh-strength high-toughness alloy structural steel in China adopts vacuum induction and vacuum self-consumption. The defects of high requirement on raw materials, small tonnage of the furnace, low production efficiency and the like of the vacuum induction furnace cause the problems of short supply of materials, long delivery period, high price and the like. With the more batch of scientific research products, the supply and demand of the market tend to be more tense; the Mf transformation point of the traditional ultrahigh-strength high-toughness alloy structural steel is below 35 ℃, so that quenching needs to be slowly cooled in a low-temperature section and the retention time is long, thereby ensuring that the structure transformation is sufficient, and the temperature of the quenching liquid is required to be less than or equal to 35 ℃. In view of the characteristics, in the actual production, only an oil cooling mode can be adopted, so that the environment is polluted, and particularly, in hot summer, the production is difficult to organize because the oil temperature cannot meet the technological requirements; meanwhile, the tensile strength of the traditional ultrahigh-strength high-toughness alloy structural steel can only reach 1600Mp, the impact toughness AKU can only be about 60J, and the requirement of the current market on the ultrahigh-strength high-toughness steel cannot be better met.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the ultrahigh-strength high-toughness alloy structural steel which can raise the Mf point to about 90 ℃, can adopt oil cooling to relax the limitation of the oil temperature to be less than or equal to 70 ℃ in actual production, can adopt a more environment-friendly water-based liquid quenching mode and can ensure that the strength level is controlled to be more than 1700MPa and the impact toughness AKU is not less than 64J.
In order to achieve the purpose, the invention adopts the following technical scheme:
the ultrahigh-strength high-toughness alloy structural steel is characterized in that: the ultrahigh-strength high-toughness alloy structural steel comprises, by mass, 0.26-0.36% of C, and Mn: 0.90-1.70%, Si: 1.50-2.20%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Ni: 5.00-6.60%, Cr 0.90-1.20%, Mo: 0.45-0.95%, V: 0.07 to 0.15%, Nb: 0.01-0.03%, Cu: less than or equal to 0.15 percent, less than or equal to 2.0ppm of gas H, less than or equal to 15ppm of O, less than or equal to 30ppm of N, less than or equal to 0.006 percent of five-harmful elements As, less than or equal to 0.006 percent of Sn, less than or equal to 0.001 percent of Pb, less than or equal to 0.006 percent of Sb, less than or equal to 0.001 percent of Bi, and the balance of iron.
A smelting process of ultrahigh-strength high-toughness alloy structural steel is characterized by comprising the following steps of: adopting a smelting mode of electric arc furnace smelting, ladle refining, vacuum degassing and vacuum consumable electrode, and controlling P to be less than or equal to 0.015 percent; s is less than or equal to 0.005 percent, gas content [ O ] is less than or equal to 10ppm, [ H ] is less than or equal to 2ppm, and [ N ] is less than or equal to 30ppm, the material strength grade is more than 1700MPa, the impact toughness AKU is not less than 64J, the quenching mode is water-based liquid or oil cooling, and the oil temperature is limited to be less than or equal to 70 ℃. The process comprises the following steps:
step 1), selecting ingredients, and controlling the content of harmful elements: selecting high-quality waste steel or steel scraps, low-harmful-element high-quality pig iron and sponge iron, and controlling the harmful-element As of raw materials to be less than or equal to 0.006%; sn is less than or equal to 0.006 percent; pb is less than or equal to 0.001 percent; sb is less than or equal to 0.006 percent; bi is less than or equal to 0.001 percent, As + Sn + Pb + Sb + Bi is less than or equal to 0.05 percent, the purity of the molten steel is improved, and ferromolybdenum is put into an electric furnace together with furnace materials so As to remove harmful P elements As soon As possible;
step 2), smelting by adopting an alkaline eccentric bottom arc furnace: dephosphorizing, heating up, decarbonizing and degassing according to a conventional method to remove impurities, tapping by an alkaline eccentric bottom electric furnace, and only tapping without slag, so that the rephosphorization in the next procedure is prevented, wherein [ P ] is less than or equal to 0.003 percent, and the temperature is more than or equal to 1640 ℃; before tapping in an alkaline eccentric bottom electric arc furnace, adding 2.0-3.0 kg of a compound deoxidizer per ton of steel, 4.0-6.0 kg of a slag-making material per ton of steel, 10.0-15.0 kg of ferrosilicon per ton of steel, 5.0-8.0 kg of metal ferromanganese per ton of steel and 5.0-8.0 kg of metal ferrochromium per ton of steel along with steel flow in a steel ladle or in the tapping process, wherein the components are close to the lower limit of target components;
step 3), ladle furnace refining: raising the temperature during ladle furnace refining, adjusting the temperature to be more than or equal to 1550 ℃, adding 200-300 kg of lime and 10-20 kg of fluorite to adjust the slag amount, adjusting the slag alkalinity (R) to be 2.0-3.0, finely adjusting alloy to enable the components to reach the target components, degassing in vacuum for more than or equal to 20min, pouring a ladle into an electrode blank or forging steel ingots at the temperature of 1500-1550 ℃ to manufacture a consumable blank, and smelting the smelted steel into chemical components: 0.26 to 0.36 percent of C; mn: 0.90-1.70%; si: 1.50-2.20%; p is less than or equal to 0.015 percent; s is less than or equal to 0.005 percent; ni: 5.00-6.60%; 0.90 to 1.20 percent of Cr; mo: 0.45 to 0.95 percent; v: 0.07-0.15%; nb: 0.01 to 0.03 percent; cu: less than or equal to 0.15 percent; the content of harmful elements As is less than or equal to 0.006%; sn is less than or equal to 0.006 percent; pb is less than or equal to 0.001 percent; sb is less than or equal to 0.006 percent; bi is less than or equal to 0.001 percent.
Step 4), casting an electrode blank or a steel ingot into a die casting and forging the electrode blank or the steel ingot into a consumable blank, polishing the surface of the electrode blank or the forged middle blank before vacuum consumable, performing vacuum consumable, controlling the melting speed by controlling the current 10000-15000A and the voltage 20-30V in the consumable process, controlling the vacuum degree of equipment to be below 1Pa to remove impurities and gas, and controlling the gas content [ O ] to be less than or equal to 10ppm, [ H ] to be less than or equal to 2ppm, and [ N ] to be less than or equal to 30ppm so as to control the component segregation of the consumable ingot.
Compared with the prior art, the invention has the following advantages:
the invention reduces the production cost by reasonable design of chemical components, economic smelting mode, reasonable design of process parameters and the like, ensures that the comprehensive mechanical property of the material is not lower than or even slightly higher than that of the traditional ultrahigh-strength high-toughness alloy structural steel, and is named as the ultrahigh-strength high-toughness material ZY 17. The method is applied to the field of ultrahigh-strength and high-toughness materials, such as aerospace.
1) The material formula design and the smelting process are more economical (as shown in the following table 3), the problem of supply shortage caused by vacuum induction and vacuum self-consumption of the domestic ultrahigh-strength steel at present is solved, and the quenching and cooling are more environment-friendly and economical due to the fact that the Mf transition point is higher than that of the traditional material. As in table 1 below.
TABLE 1 phase transition Point of materials
| Material | Ac1/℃ | Ac3/℃ | Ms/℃ | Mf/℃ |
| ZY17 | 610 | 822 | 255 | 90 |
2) The hardenability of the material is good (as shown in the following table 2), the tensile strength and the impact energy are stable, and the tensile strength is improved by about 10 percent compared with the traditional material.
TABLE 2 hardness gradient, HRC, of the material samples
The specific implementation mode is as follows:
the technical solution of the present invention is described below by using specific examples, but the scope of the present invention is not limited thereto, and the present invention is also applicable to other specifications of products produced by using the present material.
The smelting mode of the material is electric arc furnace smelting, ladle refining, vacuum degassing and vacuum consumable smelting, and the smelting mode is more economical and reasonable and has higher production efficiency. The design chemical composition satisfies 0.26-0.36% of C; mn: 0.90-1.70%; si: 1.50-2.20%; p is less than or equal to 0.015 percent; s is less than or equal to 0.005 percent; ni: 5.00-6.60%; 0.90 to 1.20 percent of Cr; mo: 0.45 to 0.95 percent; v: 0.07-0.15%; nb: 0.01 to 0.03 percent; cu: less than or equal to 0.15 percent; the gas H is less than or equal to 2.0 ppm; o is less than or equal to 15 ppm; n is less than or equal to 30 ppm; the content of harmful elements As is less than or equal to 0.006%; sn is less than or equal to 0.006 percent; pb is less than or equal to 0.001 percent; sb is less than or equal to 0.006 percent; bi is less than or equal to 0.001 percent.
Smelting in an electric arc furnace, refining in a steel ladle, vacuum degassing and vacuum consumable, molding into an electrode blank or forging into a consumable blank, polishing the surface of the electrode blank before vacuum consumable or forging into the consumable blank, sawing the two ends of the consumable blank to be parallel and level, and controlling the smelting process through vacuum and melting speed to remove impurities and gas from steel ingots.
The invention comprises the following procedures: 1) selecting ingredients and controlling the content of harmful elements; 2) smelting in an alkaline eccentric bottom arc furnace, controlling carbon, phosphorus and temperature to meet the technological requirements, and adding a precipitation deoxidizer, lime and partial alloy along with steel flow during tapping; 3) refining in a ladle furnace, heating, deoxidizing, desulfurizing, adjusting alloy components, vacuum degassing, controlling the sulfur content to reach target components, and tapping; 4) casting into electrode blank or forging into consumable blank, and polishing the surface of the electrode blank before vacuum consumable; 5) the consumable process achieves the purposes of removing impurities and gas and further controlling the component segregation of the steel ingot by controlling vacuum and melting speed.
Selecting high-quality scrap steel or steel scraps, low-five-harmful-element high-quality pig iron and sponge iron As raw materials for smelting in an alkaline eccentric bottom arc furnace, and controlling the five-harmful element As of the raw materials to be less than or equal to 0.006 percent; sn is less than or equal to 0.006 percent; pb is less than or equal to 0.001 percent; sb is less than or equal to 0.006 percent; bi is less than or equal to 0.001 percent, As + Sn + Pb + Sb + Bi is less than or equal to 0.05 percent. The ferromolybdenum is put into an electric furnace together with furnace materials to remove harmful P elements as early as possible;
when smelting in an alkaline eccentric bottom electric arc furnace, dephosphorizing, heating up, decarburizing, degassing and removing impurities by a conventional method, tapping in the alkaline eccentric bottom electric arc furnace, wherein the tapping is only carried out without slag, [ P ] is less than or equal to 0.003 percent, and the temperature is more than or equal to 1640 ℃;
before tapping, adding 2.0-3.0 kg of a compound deoxidizer, 4.0-6.0 kg of a slagging material, 10.0-15.0 kg of ferrosilicon, 5.0-8.0 kg of metal ferromanganese and 5.0-8.0 kg of metal ferrochromium into a steel ladle or along with steel flow in the tapping process of an alkaline eccentric bottom electric arc furnace, wherein the components are close to the lower limit of target components;
heating in a ladle furnace refining process, adjusting the temperature to be more than or equal to 1550 ℃, adding 200-300 kg of lime and 10-20 kg of fluorite to adjust the slag amount, adjusting the slag alkalinity (R) to be 2.0-3.0, finely adjusting the alloy to enable the components to reach the target components, carrying out vacuum degassing for more than or equal to 20min, carrying out ladle casting at the temperature of 1500-1550 ℃ to obtain an electrode blank or a steel ingot, cutting off a riser of the electrode blank, forging the steel ingot to obtain a consumable blank, and polishing the surface of the electrode blank or the consumable blank before vacuum consumable.
When the ingredients are selected, raw materials such As high-quality scrap steel or steel scraps, low-five-harmful-element high-quality pig iron, sponge iron and the like are used, and particularly the contents of As, Sn, Pb, Sb, Bi and other harmful impurities in the raw materials are controlled, so that the purity of the molten steel is greatly improved, and the purity of the ultrahigh-strength steel can be further improved; when the alkaline eccentric bottom arc furnace taps steel, only tapping is carried out, and slag is not discharged, so that the rephosphorization in the next procedure is effectively prevented; before the alkaline electric arc furnace discharges steel, a composite deoxidizer, a slag-making material, special ferrosilicon, metallic ferromanganese, metallic ferrochromium alloy and a nickel plate are added into a steel ladle or along with steel flow in the process of discharging steel, and the components are close to the lower limit of target components. Adjusting the temperature in a steel ladle, finely adjusting the alloy, adding lime and fluorite to adjust the slag amount, adjusting the slag alkalinity (R) of 2.0-3.0, finely adjusting the alloy to enable the components to reach the target components, degassing in vacuum, and ensuring uniform components and temperature and low gas content.
The surface of a vacuum consumable front electrode blank or a steel ingot forging blank turning is performed to perform self-empty consumable, the purpose of controlling the melting speed is achieved by controlling the current 10000-15000A and the voltage 20-30V in the consumable process, the vacuum degree of equipment is controlled below 1Pa to remove impurities and gas, the gas content [ O ] is controlled to be less than or equal to 10ppm, the [ H ] is controlled to be less than or equal to 2ppm, and the [ N ] is controlled to be less than or equal to 30ppm, so that the component segregation of the consumable ingot is controlled.
Example (b): smelting in an electric arc furnace, ladle refining, vacuum degassing and vacuum consumable electrode. The development of a new material product with ultrahigh strength and high toughness comprises the following steps:
step 1), selecting high-quality scrap steel or steel scraps, low-harmful-element high-quality pig iron and sponge iron, and controlling the harmful-element As of raw materials to be less than or equal to 0.006%; sn is less than or equal to 0.006 percent; pb is less than or equal to 0.001 percent; sb is less than or equal to 0.006 percent; bi is less than or equal to 0.001 percent, As + Sn + Pb + Sb + Bi is less than or equal to 0.05 percent. The ferromolybdenum is put into an electric furnace together with furnace materials to remove harmful P elements as early as possible;
step 2), heating during ladle furnace refining, adjusting the temperature to be more than or equal to 1550 ℃, adding lime and fluorite to adjust the slag amount, adjusting the slag alkalinity (R) to be 2.0-3.0, finely adjusting the alloy to enable the components to reach the target components, carrying out vacuum degassing for more than or equal to 20min, carrying out ladle casting at the temperature of 1500-1550 ℃ to obtain an electrode blank or forging a steel ingot to obtain a consumable blank, and polishing the surface of the electrode blank or the forged middle blank before vacuum consumable;
and 3) casting the ingot by using a steel ingot mould with a large upper part and a small lower part and provided with heat insulation plates. The chemical components of the smelted steel are shown in the following table 3, and the table shows the comparison of the components of the new ultrahigh-strength and high-toughness material steel produced by different smelting methods, and the result shows that the new ultrahigh-strength and high-toughness material steel produced by the process has the advantages of stable components, low five-harmful elements, low gas components, low smelting cost, stable performance and high qualification rate of not less than 95%.
TABLE 3 comparison of chemical compositions
The physical and chemical detection of the finished product samples of the examples is shown in tables 4 and 5:
table 4: mechanical properties after quenching oil cooling of examples
Table 5: mechanical properties of quenched aqueous base fluids after cooling of examples
The data results in tables 4 and 5 show that the performance of both oil quenching and water-based liquid quenching can meet the design requirements of materials, the tensile strength is over 1800MPa, the margin is large, the impact energy is over 64J, and the comprehensive performance is good. The tensile strength of the quenching adopting water-based liquid cooling is slightly higher than that of oil cooling by 20-50Mpa, and the impact energy is slightly lower than that of oil cooling by 4-10J, because the cooling strength of the high-temperature section of the water-based liquid is higher than that of oil, the quenching characteristic of the material is met, and the normal phenomenon is achieved.
All the experimental data show that the invention ensures the good comprehensive performance of the novel material with ultrahigh strength and high toughness through the production process schemes of the chemical component design of the material, the economic smelting mode and the like. After being used by customers, the material reaches the design index of the material, and the feedback is better. Compared with the traditional ultrahigh-strength high-toughness steel, the product has the advantages of low production cost, environmental protection, economy, stable product quality and the like.
Claims (2)
1. The ultrahigh-strength high-toughness alloy structural steel is characterized in that: the ultrahigh-strength high-toughness alloy structural steel comprises, by mass, 0.26-0.36% of C, and Mn: 0.90-1.70%, Si: 1.50-2.20%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Ni: 5.00-6.60%, Cr 0.90-1.20%, Mo: 0.45-0.95%, V: 0.07 to 0.15%, Nb: 0.01-0.03%, Cu: less than or equal to 0.15 percent, less than or equal to 2.0ppm of gas H, less than or equal to 15ppm of O, less than or equal to 30ppm of N, less than or equal to 0.006 percent of harmful elements As, less than or equal to 0.006 percent of Sn, less than or equal to 0.001 percent of Pb, less than or equal to 0.006 percent of Sb, less than or equal to 0.001 percent of Bi, and the balance of iron; adopting a smelting mode of electric arc furnace smelting, ladle refining, vacuum degassing and vacuum consumable electrode, and controlling P to be less than or equal to 0.015 percent; the process comprises the following steps of S is less than or equal to 0.005%, the gas content [ O ] is less than or equal to 10ppm, the gas content [ H ] is less than or equal to 2ppm, the gas content [ N ] is less than or equal to 30ppm, the material strength grade is more than 1700MPa, the impact toughness AKU is not less than 64J, the quenching mode is water-based liquid or oil cooling, the oil temperature is limited to be less than or equal to 70 ℃, and the process comprises the following steps:
step 1), selecting ingredients and controlling the content of harmful elements: selecting high-quality waste steel and low-harmful-element high-quality pig iron, and controlling the harmful element As of the raw materials to be less than or equal to 0.006 percent; sn is less than or equal to 0.006 percent; pb is less than or equal to 0.001 percent; sb is less than or equal to 0.006 percent; bi is less than or equal to 0.001 percent, As + Sn + Pb + Sb + Bi is less than or equal to 0.05 percent, the purity of the molten steel is improved, and ferromolybdenum is put into an electric furnace together with furnace materials so As to remove harmful P elements As soon As possible;
step 2), smelting by adopting an alkaline eccentric bottom arc furnace: dephosphorizing, heating up, decarbonizing and degassing according to a conventional method to remove impurities, tapping by an alkaline eccentric bottom electric furnace, and only tapping without slag, so that the rephosphorization in the next procedure is prevented, wherein [ P ] is less than or equal to 0.003 percent, and the temperature is more than or equal to 1640 ℃; before tapping of an alkaline eccentric bottom electric arc furnace, 2.0-3.0 kg of a compound deoxidizer, 4.0-6.0 kg of a slagging material, 10.0-15.0 kg of ferrosilicon, 5.0-8.0 kg of metal ferromanganese and 5.0-8.0 kg of metal ferrochromium are added into a steel ladle or along with steel flow in the tapping process, wherein the components are close to the lower limit of target components;
step 3), ladle furnace refining: raising the temperature during ladle furnace refining, adjusting the temperature to be more than or equal to 1550 ℃, adding 200-300 kg of lime and 10-20 kg of fluorite to adjust the slag quantity, adjusting the slag alkalinity (R) to be 2.0-3.0, finely adjusting the alloy to ensure that the components reach the target components, carrying out vacuum degassing for more than or equal to 20min, carrying out ladle casting at the temperature of 1500-1550 ℃ to form an electrode blank or forging steel ingots into a consumable blank, smelting the chemical components of the smelted steel: 0.26 to 0.36 percent of C; mn: 0.90-1.70%; si: 1.50-2.20%; p is less than or equal to 0.015 percent; s is less than or equal to 0.005 percent; ni: 5.00-6.60%; 0.90-1.20% of Cr, Mo: 0.45 to 0.95 percent; v: 0.07-0.15%; nb: 0.01 to 0.03 percent; cu: less than or equal to 0.15 percent; the content of harmful elements As is less than or equal to 0.006%; sn is less than or equal to 0.006 percent; pb is less than or equal to 0.001 percent; sb is less than or equal to 0.006 percent; bi is less than or equal to 0.001 percent;
step 4), casting an electrode blank or a steel ingot into a die casting and forging the electrode blank or the steel ingot into a consumable blank, polishing the surface of the electrode blank or the forged middle blank before vacuum consumable, performing vacuum consumable, controlling the melting speed by controlling the current 10000-15000A and the voltage 20-30V in the consumable process, controlling the vacuum degree of equipment to be less than 1Pa to remove impurities and gas, and controlling the gas content [ O ] to be less than or equal to 10ppm, [ H ] to be less than or equal to 2ppm, and [ N ] to be less than or equal to 30ppm so as to control the component segregation of the consumable ingot.
2. A smelting process of ultrahigh-strength high-toughness alloy structural steel is characterized by comprising the following steps of: adopting a smelting mode of electric arc furnace smelting, ladle refining, vacuum degassing and vacuum consumable electrode, and controlling P to be less than or equal to 0.015 percent; the process comprises the following steps of S is less than or equal to 0.005%, the gas content [ O ] is less than or equal to 10ppm, the gas content [ H ] is less than or equal to 2ppm, the gas content [ N ] is less than or equal to 30ppm, the material strength grade is more than 1700MPa, the impact toughness AKU is not less than 64J, the quenching mode is water-based liquid or oil cooling, the oil temperature is limited to be less than or equal to 70 ℃, and the process comprises the following steps:
step 1), selecting ingredients and controlling the content of harmful elements: selecting high-quality waste steel and low-harmful-element high-quality pig iron, and controlling the harmful element As of the raw materials to be less than or equal to 0.006 percent; sn is less than or equal to 0.006 percent; pb is less than or equal to 0.001 percent; sb is less than or equal to 0.006 percent; bi is less than or equal to 0.001 percent, As + Sn + Pb + Sb + Bi is less than or equal to 0.05 percent, the purity of the molten steel is improved, and ferromolybdenum is put into an electric furnace along with furnace materials so As to remove harmful P elements As soon As possible;
step 2), smelting by adopting an alkaline eccentric bottom arc furnace: dephosphorizing, heating up, decarbonizing and degassing according to a conventional method to remove impurities, tapping by an alkaline eccentric bottom electric furnace, and only tapping without slag, so that the rephosphorization in the next procedure is prevented, wherein [ P ] is less than or equal to 0.003 percent, and the temperature is more than or equal to 1640 ℃; before tapping of an alkaline eccentric bottom electric arc furnace, 2.0-3.0 kg of a compound deoxidizer, 4.0-6.0 kg of a slagging material, 10.0-15.0 kg of ferrosilicon, 5.0-8.0 kg of metal ferromanganese and 5.0-8.0 kg of metal ferrochromium are added into a steel ladle or along with steel flow in the tapping process, wherein the components are close to the lower limit of target components;
step 3), ladle furnace refining: raising the temperature during ladle furnace refining, adjusting the temperature to be more than or equal to 1550 ℃, adding 200-300 kg of lime and 10-20 kg of fluorite to adjust the slag quantity, adjusting the slag alkalinity (R) to be 2.0-3.0, finely adjusting the alloy to ensure that the components reach the target components, carrying out vacuum degassing for more than or equal to 20min, carrying out ladle casting at the temperature of 1500-1550 ℃ to form an electrode blank or forging steel ingots into a consumable blank, smelting the chemical components of the smelted steel: 0.26 to 0.36 percent of C; mn: 0.90-1.70%; si: 1.50 to 2.20 percent; p is less than or equal to 0.015 percent; s is less than or equal to 0.005 percent; ni: 5.00-6.60%; 0.90-1.20% of Cr, Mo: 0.45 to 0.95 percent; v: 0.07-0.15%; nb: 0.01 to 0.03 percent; cu: less than or equal to 0.15 percent; the content of harmful elements As is less than or equal to 0.006%; sn is less than or equal to 0.006 percent; pb is less than or equal to 0.001 percent; sb is less than or equal to 0.006 percent; bi is less than or equal to 0.001 percent;
step 4), casting an electrode blank or a steel ingot into a die casting and forging the electrode blank or the steel ingot into a consumable blank, polishing the surface of the electrode blank or the forged middle blank before vacuum consumable, performing vacuum consumable, controlling the melting speed by controlling the current 10000-15000A and the voltage 20-30V in the consumable process, controlling the vacuum degree of equipment to be less than 1Pa to remove impurities and gas, and controlling the gas content [ O ] to be less than or equal to 10ppm, [ H ] to be less than or equal to 2ppm, and [ N ] to be less than or equal to 30ppm so as to control the component segregation of the consumable ingot.
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