CN116536584A

CN116536584A - GGP300 hot-rolled round steel for load bearing shaft and preparation method thereof

Info

Publication number: CN116536584A
Application number: CN202310495507.8A
Authority: CN
Inventors: 卢秉军; 阚开; 齐峰; 张群; 王德勇; 齐锐
Original assignee: Bengang Steel Plates Co Ltd
Current assignee: Bengang Steel Plates Co Ltd
Priority date: 2023-05-05
Filing date: 2023-05-05
Publication date: 2023-08-04

Abstract

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to GGP300 hot-rolled round steel for a load bearing shaft and a preparation method thereof. The chemical components of the paint comprise C in percentage by weight: 0.42 to 0.48 percent, si:0.17 to 0.37 percent, mn:0.7 to 0.8 percent, cr:0.1 to 0.2 percent, mo:0.02 to 0.07 percent, ni:0.05 to 0.15 percent, S: less than or equal to 0.03 percent, and the balance of iron and unavoidable impurities. According to the invention, by adding trace Cr, ni, mo, alt and other elements, the comprehensive mechanical properties of the steel are effectively improved on the premise of slightly improving the cost, so that the steel can replace quenched and tempered medium carbon steel, and the steel becomes a qualified material for producing a traction machine load shaft.

Description

GGP300 hot-rolled round steel for load bearing shaft and preparation method thereof

Technical Field

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to GGP300 hot-rolled round steel for a load bearing shaft and a preparation method thereof.

Background

The traction motor is a power device and is a device for conveying and transmitting traction power. The traction motor is mainly used for traction of an elevator car, the traditional traction motor is large in size, and a special machine room is required to be built for installing the traction motor. In recent years, with the development of elevator industry technology, the key technology of miniaturization of an elevator traction machine realizes breakthrough, and the elevator without a machine room is developed and widely applied. The elevator traction machine of the type has the advantages of small size, simple installation and maintenance, construction cost saving and compliance with the development trend of the industry.

The traction motor machine of the machine-room-less elevator adopts a traction motor load shaft to replace a traction wheel to traction a car, and the traction motor load shaft is required to have excellent mechanical property and processability, and has lower production cost and energy consumption. The conventional traction motor load shaft is manufactured by using carbon and alloy structural steel through tempering and processing, and has the advantages of long production process, high energy consumption and high heat treatment cost. According to the invention, the medium carbon structural steel is used as a carrier, a small amount of alloy elements are added, and the performance of the normalized hot rolled round steel meets the requirement of a traction motor on-load shaft on the premise of improving a small amount of cost.

Disclosure of Invention

The invention aims to provide GGP300 hot rolled round steel for a load shaft and a preparation method thereof, wherein the whole normalizing of the steel replaces workpiece tempering, the whole cost of the load shaft of a tractor is reduced on the premise that the mechanical property meets the requirement, and certain economic benefit is created for downstream users.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

the invention provides GGP300 hot-rolled round steel for a load shaft, which comprises the following chemical components in percentage by weight: c:0.42 to 0.48 percent, si:0.17 to 0.37 percent, mn:0.7 to 0.8 percent, cr:0.1 to 0.2 percent, mo:0.02 to 0.07 percent, ni:0.05 to 0.15 percent, S: less than or equal to 0.03 percent, and the balance of iron and unavoidable impurities.

The effect of the above elements in the steel of the invention is as follows:

c: the traditional strengthening elements in steel are the most economical elements. Although increasing the C content is advantageous for improving the strength, it is disadvantageous for the plasticity, toughness, formability, weldability, and the like. The C content in the steel grade is selected to be 0.42-0.48%.

Si: as deoxidizer, the Si content is improved to ensure good deoxidization of the steel, and the solid solution strengthening effect of Si is also beneficial to improving the strength of the steel. Si is believed to impair the toughness of the steel, and the content is not preferred to exceed 0.80% or 0.90%. However, it has also been pointed out that Si improves the toughness of ferritic-pearlitic steels and thus some Si-added non-quenched and tempered steels have been developed. However, in the case of so-called Si-added non-quenched and tempered steel, the Si content is also 0.7% or less, and therefore, the Si content is designed to be 0.17 to 0.37%.

Mn: the iron matrix is present as a solid solution strengthening element in steel, and the strength of the iron matrix in steel is improved. The Mn content in the steel can enlarge the gamma zone, reduce the transformation temperature of gamma-alpha, enlarge the rolling range, greatly reduce the growth opportunity of ferrite grains, promote the grain refinement, and increase the toughness of the steel, but the high Mn content can increase the cost of the steel, also can improve the carbon equivalent, and is unfavorable for welding, and the Mn content in the steel is 0.70-0.80%.

Cr: the addition of a small amount of Cr can improve the strength and the austenite stability of the steel, so that the non-quenched and tempered steel structure and the hardness have little change along the section distribution, and simultaneously, the matrix is solid-solution strengthened and the structure is refined. A small amount of Cr can be added into the steel grade to improve the strength, and the content range of the Cr is designed to be 0.10-0.20%.

Mo: the solid solution in the matrix strongly delays ferrite and pearlite transformation. Mo is a strong carbide forming element, strengthening ferrite; the Ac1 point of the steel is raised, the Ac3 point is lowered, the growth of crystal grains is prevented, the growth temperature of the crystal grains is improved, and the alloy is an important alloy element of the essential fine grain steel; raising the heating temperature of the steel in the heat treatment; the quenching critical cooling speed of the steel is reduced, the hardenability and the hardenability are increased, the tempering brittleness is inhibited, and the hardness and the strength of the steel are improved. Mo is also a useful element for improving plasticity, and a small amount of Mo refines grains, but the addition of excessive amount of Mo increases hardness and decreases machinability, so that the content thereof is controlled to 0.02 to 0.07%.

Ni: ni and C do not form carbides, which are the main alloying elements that form and stabilize austenite. The effect in this respect is next to carbon and nitrogen. Ni and Fe exist in the alpha phase and the gamma phase in the steel in a mutually soluble form, strengthen the steel, and improve the low-temperature performance of the steel, particularly the toughness by refining grains in the alpha phase. Ni improves the hardenability of steel due to the reduction of critical transformation temperature and the reduction of diffusion speed of each element in steel. Ni has less influence on toughness, plasticity and other technological properties of steel than other alloy elements while improving the strength of the steel. However, considering that Ni is expensive, a small amount of Ni is added, and the content thereof is controlled to be 0.05 to 0.15%.

S: when S is plastically mixed with MnS particles in steel, the free cutting element is added, so that the effects of reducing cutting force, easily breaking chips and removing chips and lubricating are achieved, and the higher finish of the cold cutting machining surface is obtained. When Mn/S is ensured to be more than 4 during steel smelting, S in molten steel and Mn in molten steel are completely formed into MnS, so that the deleterious effect of free S is avoided and the phenomenon of hot shortness is eliminated. However, when the content ratio of Mn and S in steel is not proper, low-melting-point FeS-Fe eutectic or MnS and FeS solid solution is easy to generate 'hot shortness', and MnS can improve cold cutting processing performance of steel, but has adverse effects on physical, chemical and mechanical properties of steel. Therefore, the S content in the steel must be strictly controlled and should be 0.030% or less.

In the above technical scheme, further, the round steel mechanical properties are: rm is greater than or equal to 580MPa, reL is greater than or equal to 305MPa, A is greater than or equal to 16%, Z is greater than or equal to 35%, and the hardness is 165-210 HBW.

The invention also provides a preparation method of the GGP300 hot-rolled round steel for the load shaft, which comprises the following steps: molten iron pretreatment, converter smelting, refining furnace LF, vacuum degassing RH, continuous casting, heating, rolling and heat treatment; and normalizing the heat treatment by adopting an annealing furnace, wherein the normalizing heating temperature is 850-870 ℃, preserving the heat for 1.5h, discharging, and cooling to room temperature.

In the above technical scheme, further, the molten iron pretreatment is: slag skimming treatment is carried out before molten iron is fed into a converter, and the sulfur content of the treated molten iron is 0.020-0.040 percent by weight percent.

In the above technical scheme, further, the converter smelting is: the steel scraps account for 10 to 20 weight percent, the molten iron accounts for 80 to 90 weight percent, the converter is used for combined blowing smelting, oxygen blowing is carried out, the tapping temperature is 1600 to 1650 ℃, the tapping P is less than or equal to 0.010 percent, and C:0.1 to 0.25 percent, and the end point oxygen is less than or equal to 600ppm; slag, pre-deoxidizer and ferroalloy are added when tapping is 1/4-1/3; wherein: the slag ton steel addition amount is as follows: 1000-2000 kg/t dolomite and 4500-6000 kg/t lime; the adding amount of the pre-deoxidizer ton steel is as follows: 0.9 to 1.2kg/t of aluminum particles, 0.4 to 0.5kg/t of ferrosilicon and 3 to 4kg/t of power coal; the adding amount of the ferroalloy ton steel is as follows: 7-8 kg/t of silicomanganese, 100kg/t of ferromolybdenum and 190kg/t of nickel plate.

In the above technical solution, further, the LF refining is: adding active lime when slag surface fluctuates and molten steel and electric arc are not exposed, adding alloy and carbon powder according to chemical component target values after 5min, adding diffusion deoxidizer aluminum particles to perform diffusion deoxidization when the molten steel temperature reaches 1580-1590 ℃, closing a furnace door for 10min, sampling and analyzing chemical components for the second time when the molten steel temperature reaches 1610-1620 ℃ to confirm the deviation value of the content of each chemical component from the target value, after sampling for the second time, adding diffusion deoxidizer aluminum particles to continuously regulate slag, keeping the slag alkalinity more than 3, simultaneously continuously keeping white slag smelting for 15-25 min, adding aluminum wires according to the molten steel components when the molten steel temperature reaches 1620-1630 ℃ to confirm that the content of each chemical element component is in a component setting range, and starting static argon blowing after the wire feeding is finished, wherein the argon blowing time is not less than 10min; wherein: the addition amount of the active lime ton steel is as follows: 5-8 kg/t; the alloy ton steel addition amount is added after the first sampling analysis: 200-300 kg/t of high-carbon ferromanganese, 200-300 kg/t of high-carbon ferrochrome and 80-150 kg/t of ferrosilicon; the adding amount of carbon powder ton steel is as follows: 100-200 kg/t; the addition amount of the diffusion deoxidizer aluminum particle ton steel is as follows: 1-2 kg/t, and the adding amount of the diffusion deoxidizer aluminum particle ton steel is 80-120 kg/t after the second sampling analysis.

In the above technical solution, further, the RH refining is: before a vacuum pump is started, controlling the argon pressure to be 0.1-0.3 MPa, slightly moving molten steel on the slag surface without exposure, starting timing when the vacuum degree reaches 100Pa, keeping the time at least 15min, feeding a sulfur line for sulfur alloying after repressing, adding alloy according to the molten steel components, adjusting the argon pressure to be 0.1-0.5 MPa according to the target components, and adding a silicon-calcium line after static argon blowing is finished, wherein the adding amount of the silicon-calcium line is as follows: 100 m/furnace, wherein the core powder is 12.8 kg/furnace and the calcium is 3.6 kg/furnace.

In the above technical solution, further, the continuous casting is: continuous casting is carried out at 1535-1545 ℃, the temperature of the tundish is 1520-1530 ℃, the pulling speed is 0.45-0.48 m/min, the tundish H is controlled to be less than or equal to 3ppm, and the continuous casting heat preservation time is more than 24 hours; crystallizer electromagnetic stirring current 400A, end electromagnetic stirring current 280A and frequency 8Hz; and protecting casting in the whole process, wherein the crystallizer casting powder uses medium carbon steel casting powder.

In the above technical solution, further, the heating is: the billet is loaded in a cold loading mode, a warm loading mode or a hot loading mode; when the warm packing process is executed, the total heating time is reduced by 30-60 min compared with the cold packing process; when the hot charging process is executed, the total heating time is reduced by 60-90 min compared with the cold charging time; adopting an end-in and end-out walking beam type heating furnace to heat the continuous casting blank, wherein the heating period and the soaking early period are oxidizing atmosphere, the soaking later period is neutral or micro-reducing atmosphere, and the furnace temperature is as follows: preheating section: heating the mixture to a temperature of less than or equal to 700 ℃ for 2 sections: 850-870 ℃, heating 1 section: 1210-1240 ℃, 1210-1230 ℃ of soaking section, 1180-1210 ℃ of tapping blank temperature and total heating time of more than or equal to 270min.

In the above technical solution, further, the rolling is: cogging by adopting a 1150mm blooming mill, and rolling at the initial rolling temperature of 1130-1150 ℃ for 7 times of initial rolling, wherein the rolling reduction is as follows: 60mm in 1 st pass, 70mm in 2 nd pass, 66mm in 3 rd pass, 57mm in 4 th pass, 66mm in 5 th pass, 72mm in 6 th pass and 72mm in7 th pass; and the final rolling is carried out by a continuous rolling unit, the final rolling temperature is 950-980 ℃, and the specification phi of the finished steel is 90-130 mm.

The principle of the invention is as follows:

(1) In order to obtain better comprehensive performance of GGP300 steel after normalizing treatment, uniform and fine ferrite-pearlite structure can be obtained under the air cooling condition.

The CCT curve of the traditional 45 steel can be divided into three areas, the phase transformation products of a high-temperature transformation area (550-750 ℃) are mainly ferrite (F) and pearlite (P), the phase transformation products of a medium-temperature transformation area (400-580 ℃) are mainly bainite (B), the products of a low-temperature transformation area (180-380 ℃) are mainly martensite (M), the phase transformation products during air cooling are mainly ferrite-pearlite structures in a cooling speed range on the curve, and in order to obtain fine ferrite-pearlite structures, a small amount of alloy can be added into the steel to inhibit the austenitic decomposition speed so as to refine the ferrite-pearlite structures.

(2) Ensuring sufficient strength and good plasticity and toughness.

In order to make the normalized performance approach to that of quenched and tempered 45 steel, the strength and toughness of the steel are required to be improved on the basis of the traditional 45 steel, and the way is to add microalloy elements on the basis of not changing the content of C, so that the austenite stability is improved and good processability is ensured, because the strength and hardness of the steel can be improved along with the increase of the content of C, but the toughness is reduced. Alloy elements such as Cr, ni, mo and the like can be added into the developed GGP300 steel in proper amount so as to improve the strength of the GGP300 steel.

(3) The GGP300 steel has good technological properties including weldability, formability, machinability and the like in the selection of alloy elements, and the alloy design has relatively low carbon equivalent. Therefore, the added alloy elements should be added in proper amounts, and a certain S content can be maintained at the same time, so as to improve cutting performance.

The beneficial effects of the invention are as follows:

(1) The 180t converter, LF, RH and rectangular blank (350 mm multiplied by 470 mm) process is adopted to produce the traction machine load shaft steel GGP300, so that the purity and continuous casting property of the steel are ensured.

(2) By adding trace Cr, ni, mo, alt and other elements, the comprehensive mechanical property of the steel is effectively improved on the premise of slightly improving the cost, so that the steel can replace quenched and tempered medium carbon steel and becomes a qualified material for producing a traction machine load shaft.

(3) The special steel normalizing process is adopted to replace the workpiece tempering, so that the energy consumption is reduced, the production efficiency is improved, the generation of tempering waste products is reduced, and the cost is saved for users.

(4) The low-power structure, mechanical property and density of the finished steel product meet the quality requirement of the high-end product.

(5) The GGP300 yield strength and the tensile strength of the integral normalizing are close to those of the integral quenched and tempered 45 steel, the elongation after breaking and the area shrinkage are better, and the comprehensive mechanical properties are equivalent.

TABLE 1

Steel grade	Rm/MPa	ReL/MPa	A/％	Z/％
					Spindle performance requirements	≥325	≥590	≥16	≥35
Normalizing GGP300	350～395	600～670	≥20	≥42
					Tempering 45	360～420	620～680	≥17	≥38

The invention increases the alloy cost and the heat treatment cost, and the factory price of the steel is higher than that of common 45 steel. The steel can directly process workpieces without subsequent heat treatment, and the comprehensive cost of ton steel is reduced by about 800 yuan, so that the economic benefit is remarkable.

Drawings

FIG. 1 is a C45E+N steel normalizing process diagram;

FIG. 2 is a schematic diagram of normalized placement of C45E+N steel.

Detailed Description

The following examples will enable those of ordinary skill in the art to more fully understand the invention and are not intended to limit the invention in any way.

The GGP300 steel converter production process for the tractor load shaft comprises the following steps:

blast furnace molten iron, molten iron pretreatment, 180t converter smelting, refining furnace LF, vacuum degassing RH, rectangular billet continuous casting of 350mm multiplied by 470mm continuous casting billet, heating by a step heating furnace, high-pressure water descaling, blooming mill rolling, continuous rolling unit, slow cooling, normalizing, finishing, flaw detection, inspection and warehousing.

(1) Pretreatment of molten iron

Because the steel is sulfur-containing steel, the deep desulfurization of the sprayed passivated magnesium powder is not needed, the sulfur content in the molten iron is properly reduced by slag skimming operation before the molten iron enters a converter, the slag skimming is carried out for 0.2t, and the temperature of the molten iron is 1300 ℃;

(2) Smelting in a converter: the molten iron is 156.7t, the scrap steel is 34.3t, the oxygen is oxidized and decarbonized, the oxygen supply is 13min7s, and the oxygen consumption is 8364m ³ Tapping temperature 1603 ℃, tapping C:0.15 percent, slag, pre-deoxidizer and ferroalloy are added when tapping is 1/4 to 1/3, and the addition amount is as follows: 1324kg of silicomanganese, 126kg of ferrosilicon, 100kg of ferromolybdenum, 190kg of nickel plates and 94kg of aluminum particles; the addition amount of auxiliary materials is as follows: 4418kg of lime, 1041kg of dolomite and 636kg of power coal;

(3) LF furnace: when slag surface fluctuation, molten steel and electric arc are not exposed, 1087kg of active lime is added, chemical components are sampled and analyzed for the first time after 5min, auxiliary materials such as aluminum wires and the like are fed according to chemical component target values to make reducing slag for diffusion deoxidation, after the white slag is kept for 15min, alloy is added according to total component analysis results, the total operation time is 79min, the power supply time is 38min, the bottom argon blowing time is 64min, the temperature is 1647 ℃ after treatment, and the alloy addition amount is as follows: 376kg of high manganese, 210kg of high chromium, 189kg of ferrosilicon, 80kg of aluminum particles, 180kg of aluminum wires and 164kg of coke oven carburant; the addition amount of auxiliary materials is as follows: active lime: 1087kg;

(4) RH refining: before a vacuum pump is started, controlling the argon pressure to be 0.1-0.3 MPa, slightly moving molten steel on the slag surface to be not exposed, starting timing when the vacuum degree reaches 100Pa, keeping for 15min, feeding 120kg of sulfur wires for sulfur alloying after repressing, adding alloy according to the components of molten steel, adjusting the argon pressure to be 0.1-0.5 MPa, adding 100kg of silicon-calcium wires after static argon blowing is finished, and adding the alloy according to the following weight: 44kg of ferromanganese, 19kg of ferrochrome, 26kg of ferrosilicon and 31kg of aluminum particles;

(5) Continuous casting: the temperature of the tundish is 1540 ℃, the pulling speed is 0.45m/min, the tundish [ H ] is 2.3ppm, the four flows of steel are poured, the electromagnetic stirring current of the crystallizer is 400A, the electromagnetic stirring current of the tail end is 280A, and the frequency is 8Hz; the whole process protection casting is carried out, and the crystallizer casting powder uses medium carbon steel casting powder; the casting blank is cut by self-flame, the red steel pad bottom of the continuous casting blank is pressed up to ensure the flatness of the casting blank of the two furnaces, and the heat preservation time is 36 hours;

(6) Heating: after slow cooling, cold charging into a furnace, wherein the charging temperature is less than 200 ℃, and a walking beam type heating furnace is adopted to perform three-section heating, so that uniform and thorough burning of the continuous casting is ensured, the heating temperature is 1240 ℃ (furnace temperature), the casting blank temperature is about 1200 ℃, and the total heating time is 6h and 20min;

(7) Rolling: the continuous casting billet is descaled by adopting high-pressure water, the pressure is more than or equal to 20MPa, the initial rolling temperature is 1130 ℃, the blooming is carried out by adopting a 1150mm BD blooming mill, the rolling is carried out for 7 times, the rolling reduction is carried out: 60mm in the 1 st pass, 70mm in the 2 nd pass, 66mm in the 3 rd pass, 57mm in the 4 th pass, 66mm in the 5 th pass, 72mm in the 6 th pass, 72mm in the 7 th pass, and rolling by a continuous rolling unit at a finishing temperature of 950 ℃ and a finished steel specification phi of 115mm;

(8) And (3) heat treatment: normalizing treatment is carried out by adopting an annealing furnace of a special steel plant, steel is scattered and bundled, thick sizing blocks are adopted for each layer, the normalizing effect is guaranteed, the normalizing heating temperature is controlled to 860 ℃, the heat is preserved for 1h after uniform and thorough burning, the total furnace time is 20h, the steel is discharged from the furnace and is air-cooled, and fans at two sides of the air-cooling stage are used for blowing.

Product detection results:

(1) Low power tissue

TABLE 2

Project	General porosity	Center porosity	Ingot segregation
				Standard requirements	≤2.0	≤2.0	≤2.0
Actual practice is that of	0.5	1.0	0.5

(2) Mechanical properties

TABLE 3 Table 3

(3) Austenite grain size

The austenitic grain size of the steel is rated as 7 grades, and the requirements of 5-8 grades are met.

(4) Ultrasonic flaw detection

The steel products are subjected to ultrasonic flaw detection one by one, and all the steel products meet GB/T4162A level specifications.

The above examples are only preferred embodiments of the present invention and are not limiting of the implementation. The protection scope of the present invention shall be subject to the scope defined by the claims. Other variations or modifications may be made in the various forms based on the above description. Obvious variations or modifications of the embodiments are within the scope of the invention.

Claims

1. GGP300 hot rolled round steel for load shaft is characterized in that the chemical components thereof comprise, by weight percent: c:0.42 to 0.48 percent, si:0.17 to 0.37 percent, mn:0.7 to 0.8 percent, cr:0.1 to 0.2 percent, mo:0.02 to 0.07 percent, ni:0.05 to 0.15 percent, S: less than or equal to 0.03 percent, and the balance of iron and unavoidable impurities.

2. The GGP300 hot rolled round steel for a load shaft according to claim 1, wherein the round steel has mechanical properties of: rm is greater than or equal to 580MPa, reL is greater than or equal to 305MPa, A is greater than or equal to 16%, Z is greater than or equal to 35%, and the hardness is 165-210 HBW.

3. A method for preparing GGP300 hot rolled round steel for a load axle according to any one of claims 1-2, characterized in that the hot rolled round steel is prepared by the process route: molten iron pretreatment, converter smelting, refining furnace LF, vacuum degassing RH, continuous casting, heating, rolling and heat treatment;

and normalizing the heat treatment by adopting an annealing furnace, wherein the normalizing heating temperature is 850-870 ℃, preserving the heat for 1.5h, discharging, and cooling to room temperature.

4. The method according to claim 3, wherein the molten iron pretreatment is: slag skimming treatment is carried out before molten iron is fed into a converter, and the sulfur content of the treated molten iron is 0.020-0.040 percent by weight percent.

5. A method of manufacture according to claim 3, wherein the converter smelting is: the weight percentage of the scrap steel is 10 to 20 percent, and the molten iron is 80 to 90 percent; blowing oxygen by the combined blowing smelting of the converter, wherein the tapping temperature is 1600-1650 ℃, the tapping P is less than or equal to 0.010%, and C:0.1 to 0.25 percent, and the end point oxygen is less than or equal to 600ppm; slag, pre-deoxidizer and ferroalloy are added when tapping is 1/4-1/3;

wherein: the slag ton steel addition amount is as follows: 1000-2000 kg/t dolomite and 4500-6000 kg/t lime; the adding amount of the pre-deoxidizer ton steel is as follows: 0.9 to 1.2kg/t of aluminum particles, 0.4 to 0.5kg/t of ferrosilicon and 3 to 4kg/t of power coal; the adding amount of the ferroalloy ton steel is as follows: 7-8 kg/t of silicomanganese, 100kg/t of ferromolybdenum and 190kg/t of nickel plate.

6. A method of manufacture according to claim 3, wherein the LF refining is: adding active lime when slag surface fluctuates and molten steel and electric arc are not exposed, adding alloy and carbon powder according to chemical component target values after 5min, adding diffusion deoxidizer aluminum particles to perform diffusion deoxidization when the molten steel temperature reaches 1580-1590 ℃, closing a furnace door for 10min, sampling and analyzing chemical components for the second time when the molten steel temperature reaches 1610-1620 ℃ to confirm the deviation value of the content of each chemical component from the target value, after sampling for the second time, adding diffusion deoxidizer aluminum particles to continuously regulate slag, keeping the slag alkalinity more than 3, simultaneously continuously keeping white slag smelting for 15-25 min, adding aluminum wires according to the molten steel components when the molten steel temperature reaches 1620-1630 ℃ to confirm that the content of each chemical element component is in a component setting range, and starting static argon blowing after the wire feeding is finished, wherein the argon blowing time is not less than 10min;

wherein: the addition amount of the active lime ton steel is as follows: 5-8 kg/t; the alloy ton steel addition amount is added after the first sampling analysis: 200-300 kg/t of high-carbon ferromanganese, 200-300 kg/t of high-carbon ferrochrome and 80-150 kg/t of ferrosilicon; the adding amount of carbon powder ton steel is as follows: 100-200 kg/t; the addition amount of the diffusion deoxidizer aluminum particle ton steel is as follows: 1-2 kg/t, and the adding amount of the diffusion deoxidizer aluminum particle ton steel is 80-120 kg/t after the second sampling analysis.

7. A method of manufacture according to claim 3, wherein the RH refining is: before a vacuum pump is started, controlling the argon pressure to be 0.1-0.3 MPa, slightly moving molten steel on the slag surface without exposure, starting timing when the vacuum degree reaches 100Pa, keeping the time at least 15min, feeding a sulfur line for sulfur alloying after repressing, adding alloy according to the molten steel components, adjusting the argon pressure to be 0.1-0.5 MPa according to the target components, and adding a silicon-calcium line after static argon blowing is finished, wherein the adding amount of the silicon-calcium line is as follows: 100 m/furnace, wherein the core powder is 12.8 kg/furnace and the calcium is 3.6 kg/furnace.

8. A method of manufacture according to claim 3, wherein the continuous casting is: continuous casting is carried out at 1535-1545 ℃, the temperature of the tundish is 1520-1530 ℃, the pulling speed is 0.45-0.48 m/min, the tundish H is controlled to be less than or equal to 3ppm, and the continuous casting heat preservation time is more than 24 hours; crystallizer electromagnetic stirring current 400A, end electromagnetic stirring current 280A and frequency 8Hz; and protecting casting in the whole process, wherein the crystallizer casting powder uses medium carbon steel casting powder.

9. A method of preparation according to claim 3, wherein the heating is: the billet is loaded in a cold loading mode, a warm loading mode or a hot loading mode; when the warm packing process is executed, the total heating time is reduced by 30-60 min compared with the cold packing process; when the hot charging process is executed, the total heating time is reduced by 60-90 min compared with the cold charging time; adopting an end-in and end-out walking beam type heating furnace to heat the continuous casting blank, wherein the heating period and the soaking early period are oxidizing atmosphere, the soaking later period is neutral or micro-reducing atmosphere, and the furnace temperature is as follows: preheating section: heating the mixture to a temperature of less than or equal to 700 ℃ for 2 sections: 850-870 ℃, heating 1 section: 1210-1240 ℃, 1210-1230 ℃ of soaking section, 1180-1210 ℃ of tapping blank temperature and total heating time of more than or equal to 270min.

10. A method of manufacture according to claim 3, wherein the rolling is: cogging by adopting a 1150mm blooming mill, and rolling at the initial rolling temperature of 1130-1150 ℃ for 7 times of initial rolling, wherein the rolling reduction is as follows: 60mm in 1 st pass, 70mm in 2 nd pass, 66mm in 3 rd pass, 57mm in 4 th pass, 66mm in 5 th pass, 72mm in 6 th pass and 72mm in7 th pass; and the final rolling is carried out by a continuous rolling unit, the final rolling temperature is 950-980 ℃, and the specification phi of the finished steel is 90-130 mm.