阅读说明：本技术 一种冶炼极细金刚砂线用钢的工艺方法 (Process method for smelting steel for superfine carborundum wire ) 是由 徐迎铁 黄宗泽 刘湘江 万根节 齐彦峰 于 2020-05-06 设计创作，主要内容包括：本发明公开一种冶炼极细金刚砂线用钢工艺方法,包括1)真空感应炉以纯铁和低磷生铁为原料氩气条件下熔成液态钢,抽真空熔炼,低于300Pa高真空下脱气15-20min并调整钢分,高纯硅铁做脱氧剂真空下浇铸圆形铸锭,每锭1.5-2.5吨,直径0.35-0.4m,长度2-3m；2)圆形铸锭制作可供电渣冶炼用电极棒；3)电极棒作原料通过电渣炉重熔冶炼,电渣渣系要求：CaF-(2):45-55％,Al-(2)O-(3):15-25％,SiO-(2):20-25％,Na-(2)O:2-4％,K-(2)O:1-2％；电渣冶炼制作圆柱电渣锭,直径0.4-0.5m；4)电渣锭锻造成可供轧制线材的方形锻造坯,正方形边长0.140-0.160m,锻造坯长度大于6m；5)通过线材轧制直径4.5-5.5mm盘条,盘条成分：C:0.92-1.1％,Si:0.3-0.4％,Mn:0.5-0.8％,Al<0.0008％,N<0.005％,S<0.01％,P<0.015％。(The invention discloses a process method for smelting steel for an ultrafine carborundum wire, which comprises 1) melting pure iron and low-phosphorus pig iron into liquid steel in a vacuum induction furnace under the condition of argon by taking the pure iron and the low-phosphorus pig iron as raw materials, vacuumizing for smelting, degassing for 15-20min under high vacuum of less than 300Pa, adjusting steel content, and obtaining high-purity steelCasting a circular cast ingot under vacuum by using ferrosilicon as a deoxidizer, wherein each ingot is 1.5-2.5 tons, the diameter is 0.35-0.4m, and the length is 2-3 m; 2) manufacturing a circular ingot casting electrode rod capable of supplying power for slag smelting; 3) the electrode bar is used as a raw material to be remelted and smelted by an electroslag furnace, and the electroslag system requires that: CaF 2 :45‑55％，Al 2 O 3 :15‑25％，SiO 2 :20‑25％，Na 2 O:2‑4％,K 2 1-2% of O; electroslag smelting to manufacture a cylindrical electroslag ingot with the diameter of 0.4-0.5 m; 4) electroslag ingot forging is carried out to obtain a square forging blank for rolling wire rods, the side length of the square is 0.140-0.160m, and the length of the forging blank is more than 6 m; 5) rolling a wire rod with the diameter of 4.5-5.5mm by a wire rod, wherein the wire rod comprises the following components: 0.92-1.1% of C, 0.3-0.4% of Si, 0.5-0.8% of Mn, Al<0.0008％，N<0.005％，S<0.01％，P<0.015％。)

1. A process method for smelting steel for an ultra-fine diamond wire is characterized by comprising the following steps:

1) melting carbon-free pure iron and low-phosphorus pig iron containing 3.5-4.5% of carbon as raw materials for a vacuum induction furnace into liquid molten steel under the protection of argon, vacuumizing, starting vacuum melting, degassing for 15-20min under the high vacuum condition of less than 300Pa, adjusting the components of the molten steel, using high-purity silicon iron as a deoxidizing agent in the deoxidizing process, casting into round ingots under the vacuum condition after the smelting components are qualified, wherein the mass of each ingot is 1.5-2.5 tons, the diameter of each ingot is 0.35-0.4m, and the length of each ingot is 2-3 m;

2) cleaning the surface of the round cast ingot, and manufacturing an electrode rod for smelting electric slag;

3) the electrode bar is used as a raw material and is remelted and smelted by an electroslag furnace, and the electroslag system has the following requirements:

CaF₂:45-55％，Al₂O₃:15-25％，SiO₂:20-25％，Na₂O:2-4％,K₂O:1-2％；

electroslag smelting is carried out to manufacture a cylindrical electroslag ingot, wherein the diameter of the electroslag ingot is required to be 0.4-0.5 m;

4) the electroslag ingot is forged into a forging blank for rolling wires, the forging blank is a square blank, the side length of the square section is 0.140-0.160m, and the length of the forging blank is more than 6 m;

5) rolling the steel wire rod into a wire rod with the diameter of 4.5-5.5mm by a wire rod, wherein the final wire rod has the following components: [C] 0.92-1.1%, 0.3-0.4% of [ Si ], [ Mn ], [ Al ] < 0.0008%, [ N ] < 0.005%, [ S ] < 0.01%, and [ P ] < 0.015%.

2. The process for smelting steel for ultra-fine diamond wire according to claim 1, wherein the scale of the vacuum induction furnace is 2 to 5 tons.

3. The process for smelting steel for ultra-fine diamond wires according to claim 1, wherein the step 2) of cleaning the surface of the round ingot comprises a step of cutting off a large end with a constricted end by 5-10 cm.

4. The process method for smelting steel for ultrafine diamond wires according to claim 1, wherein in step 1), the composition of the end point of smelting in a vacuum induction furnace is further required to be as follows: [C] 0.94-1.1%, [ Si ] 0.35-0.45%, [ Mn ] 0.6-0.8%, [ Al ] < 0.001%, [ N ] < 0.0045%, [ S ] < 0.01%, [ P ] < 0.015%; controlling the end point temperature of the smelting molten steel at 1460-1500 ℃, properly blowing argon for protection after the vacuum smelting is finished, adjusting the pressure in the furnace to 10000-20000 Pa, and then pouring in the protective atmosphere.

5. The process for producing steel for very fine diamond wires according to claim 1 or 4, wherein in the step 1), a cast iron mold is used as the mold.

6. The process for smelting steel used for ultra-fine diamond wire according to claim 1, wherein the step 1) comprises the steps of adding a small amount of lime for slagging, dephosphorizing and desulfurizing after the ferrous material is completely melted, wherein the adding amount of lime is 2-5 kg/t.

7. The process for smelting steel for an ultrafine diamond wire according to claim 1, wherein in the step 3), the electroslag process is performed under a protective atmosphere, and electroslag smelting at a constant melting speed is adopted.

Technical Field

The invention relates to a process method for smelting steel for an ultra-fine diamond wire, belonging to the technical field of steel making.

Background

The diamond wire is mainly used for cutting silicon wafers, jewels and the like, the silicon wafers are main raw materials in the photovoltaic and electronic industries, in order to improve the cutting efficiency, the diamond wire requires an extremely fine specification, the diameter is usually required to be between 0.04 and 0.055mm, the diamond wire is thinner than human hair, the extremely fine specification provides a strict requirement for controlling inclusions of steel used by the diamond wire, the width of all the inclusions contained by the diamond wire is comprehensively smaller than 10 mu m, and the diamond wire cannot contain brittle aluminum inclusions; in the prior art, some Japanese enterprises complete production through a converter-refining furnace-continuous casting-blooming-wire rod rolling process, measures such as strict control of aluminum content of refractory materials and modification treatment of inclusions are mainly adopted in the smelting process for inclusion control to realize inclusion refinement and have deformability, even if the measures are adopted, wire breakage still exists in the process of drawing the diamond-sand wire of the wire rod produced by the process, the wire rod is basically large-particle silicon-aluminum inclusions, the wire breakage has great influence on drawing production, and the wire connecting time after wire breakage can exceed 2 hours. The main problem of enterprises which do not have the capability of producing steel for the diamond wire in the converter process and the electric furnace process is that the enterprises can not control the inclusions which do not contain brittle alumina inclusions and high magnesia content inclusions, if the inclusions are controlled by improving refractory materials, the production cost of the whole process is greatly improved, the demand of the diamond wire is small, the profit of the diamond wire can not support the increase of the refractory material cost of the whole process, and therefore, the economic benefit can not be obtained when the diamond wire is produced by using the converter process or the electric furnace process.

In order to ensure that the diamond yarn has enough breaking force and meet the requirement of cutting silicon wafers with high efficiency, the carbon content in steel has higher requirement, generally at least more than 0.92 percent is required, the content is preferably more than 1 percent, and in addition, the nitrogen content is required to be less than 50ppm, the component requirement cannot be used for other steel types, the steel for producing diamond grit on a large scale in a converter-refining flow or an electric furnace refining flow has difficulty in production organization, once the inclusion control is unqualified, the whole furnace steel faces the rejection risk, and meanwhile, the continuous production cannot be carried out in the continuous casting process. From the market demand, the diamond wire is not consumed greatly in production because of durability, the Chinese market demand is maintained at 2000-10000 tons, and the ordering of diamond wire manufacturers to steel manufacturers is not higher than 30 tons each time, so that the production cannot be organized by using an electric furnace process or a converter process of more than 100 tons.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a process for smelting steel for superfine diamond dust, which can meet the requirements of small-scale and high-demand production of steel grade for superfine diamond dust wire and realize continuous wire drawing of the diamond dust wire by controlling inclusions.

The technical problem to be solved can be implemented by the following technical scheme.

A process method for smelting steel for superfine carborundum wires, namely the steel for carborundum wires is produced by a vacuum induction furnace, electroslag, forging and wire rod rolling, and mainly comprises the following steps:

1) melting pure iron without carbon and low-phosphorus pig iron containing 3.5% -4.5% of carbon into liquid molten steel 2-5 tons under the protection of argon for a 2-5 ton-scale vacuum induction furnace, then vacuumizing and starting vacuum melting, degassing for 15min-20min under the high vacuum condition of less than 300Pa and adjusting the components of the molten steel, using high-purity ferrosilicon as a deoxidizing agent in the deoxidizing process, strictly prohibiting adding an aluminum-containing deoxidizing agent, casting into 1-2 round ingots under the vacuum condition after smelting components are qualified, wherein the mass of each ingot is 1.5-2.5 tons, the diameter of each ingot is 0.35-0.4m, and the length of each ingot is 2-3 m.

The vacuum induction furnace is selected as the primary smelting furnace, and the denitrification requirement related to the steel grade requirement of the invention can be met by utilizing the small-scale smelting function of the vacuum induction furnace and the characteristic of vacuum degassing function; in addition, the vacuum induction furnace can realize vacuum protection pouring, and can avoid secondary oxidation and nitrogen absorption of molten steel which are easy to occur in the atmosphere pouring process. Considering that the weight of a casting ingot is 1.5-2.5 tons, when 1-2 ingots need to be cast, a vacuum induction furnace with the scale of 2-5 tons needs to be selected for production; if the induction furnace is selected to be too large and 3 or more cast ingots need to be poured, the vacuum pouring is difficult to realize; pure iron and pig iron are selected as raw materials, the carbon content of the steel is mainly considered, the pig iron can contain about 4% of carbon, the carbon content requirement of about 1% of the final molten steel can be met, in addition, the content of harmful residual elements of the pure iron and the pig iron is lower, and the condition that the harmful residual elements of the steel do not exceed the standard can be ensured. Degassing for 15-20min under high vacuum condition mainly to ensure denitrification to meet the steel grade requirement and dehydrogenation to ensure no hydrogen induced cracking; the molten steel components can be adjusted in the vacuum treatment process, high-purity manganese and high-purity silicon iron are added to meet the requirements of final components of products, the high-purity silicon iron is used as a deoxidizer, the problem that the final aluminum content exceeds the standard due to the fact that the ordinary silicon iron is high in aluminum content is mainly solved, and the aluminum-containing deoxidizer is forbidden because high-alumina-content impurities contained in the steel are brittle impurities and have high drawing destructiveness on a diamond wire; the size requirement of the final cast ingot is mainly set based on the size requirement of an electroslag electrode rod related to a post process.

2) Cleaning the surface of the round cast ingot, cutting off a big head with a contraction end by 5-10cm, and manufacturing the electrode rod for slag smelting.

3) The electrode bar is used as a raw material, remelting and smelting are carried out through an electroslag furnace, and the electroslag system requires that: CaF₂:45-55％，Al₂O₃:15-25％，SiO₂:20-25％，Na₂O:2-4％,K₂1 to 2 percent of O, and electroslag smelting to manufacture a cylindrical electroslag ingot, wherein the diameter of the electroslag ingot is required to be 0.4 to 0.5 m.

Electroslag furnaceThe melting is a process of connecting an electrode rod, slag and molten steel of a crystallizer into an electrified loop, gradually melting the contact part of the top end of the electrode rod and the slag into liquid drops by utilizing local heating of the slag under the condition of low pressure and high current, leading a large amount of separated liquid drops to penetrate through a slag layer and fall into a molten steel bath of the crystallizer, and re-solidifying the contact part of the molten steel bath and the crystallizer. The electroslag remelting filters molten steel through slag, large inclusions can be thoroughly removed, the remaining inclusions can be stably smaller than 13 mu m, meanwhile, the structure of an electroslag remelting ingot is uniform and compact, and after electroslag remelting, the remaining inclusions in steel are closer to the slag components in electroslag, so the technical scheme controls the slag components to be in the following ranges: CaF₂:45-55％，Al₂O₃:15-25％，SiO₂:20-25％，Na₂O:2-4％,K₂1-2% of oxygen, the main purpose of which is to control the remaining small-particle inclusion content of the molten steel, in which the CaF content of the slag is also in this range₂Part can change into CaO, and inclusion has the characteristics that melting point low plasticity ability is strong in this within range, can fully warp along forging or rolling direction in the back process forging and rolling process, and the inclusion width can be comprehensively less than 7 mu m after the deformation, and the inclusion is relatively slick and sly with the contact surface of steel, and is little to the destruction of steel in the drawing process, can not lead to drawing disconnected silk, has also guaranteed that the diamond-impregnated wire is at the continuous silk of the in-process of cutting silicon chip. The size of the electroslag ingot is selected mainly by considering the design convenience of an electroslag crystallizer and the convenience of forging in the subsequent process.

4) The electroslag ingot is forged into a forging blank for rolling wires, the forging blank is a square blank, the section of the forging blank is square, the side length of the square is 0.140-0.160m, and the length of the forging blank is more than 6 m.

5) Rolling the steel wire rod into a wire rod with the diameter of 4.5-5.5mm through a wire rod. The final wire rod has the following composition requirements; [C] 0.92-1.1%, 0.3-0.4% of [ Si ], [ Mn ], [ Al ] < 0.0008%, [ N ] < 0.005%, [ S ] < 0.01%, and [ P ] < 0.015%.

The wire rod produced by the invention can be finally drawn into a diamond wire bus with the diameter of 0.04-0.055mm, and the continuous wire cutting is realized in the drawing process, so that the wire rod is used for cutting silicon wafers, jewels and the like with high efficiency.

As a further improvement of the technical scheme, step 1) further requires the components at the end point of smelting in the vacuum induction furnace: [C] 0.94-1.1%, [ Si ] 0.35-0.45%, [ Mn ] 0.6-0.8%, [ Al ] < 0.001%, [ N ] < 0.0045%, [ S ] < 0.01%, [ P ] < 0.015%. In consideration of further attenuation of silicon in the electroslag process, the content of silicon is higher after vacuum treatment; and since aluminum is further attenuated by the electroslag process, the requirement of < 0.0008% is difficult to achieve, so the requirement is set to < 0.001%.

The end temperature of the smelting molten steel is 1460-1500 ℃, argon blowing protection is properly carried out after vacuum smelting is finished, the pressure in the furnace is adjusted to be 10000-20000 Pa, then casting is carried out under the protective atmosphere, and a casting mold is adopted.

The control of the end-point components of carbon, silicon and aluminum in the smelting of the vacuum induction furnace is slightly higher than the components of steel after electroslag remelting, which mainly considers that the contents of carbon, silicon and aluminum in molten steel in the electroslag remelting process have certain attenuation. The control of the end point temperature of the vacuum induction furnace at 1460-1500 ℃ mainly considers that the pouring superheat degree is 20-60 ℃, the temperature in the range can be cast to be qualified for electroslag electrode rods, in the actual production, if only one ingot is poured, the end point temperature can be controlled to be lower than the lower limit, if 2 ingots are poured, the end point temperature is controlled to be upper than the upper limit, otherwise, the risk that the second ingot is easy to be poured incompletely exists. The vacuum protection pouring is to prevent nitrogen absorption and secondary oxidation in the pouring process.

As a further improvement of the technical scheme, in the step 1), after the iron raw material is completely melted, a small amount of 2-5kg/t lime is added for slagging, dephosphorizing and desulfurizing. Wherein, should not add too much slagging-off material in the vacuum induction furnace smelting, otherwise can have the slagging-off material to melt and influence degasification etc. but because can't avoid containing sulphur and phosphorus in the raw materials, in order to ensure that desulfurization and dephosphorization are in place, can add a small amount of lime to ensure that desulfurization and dephosphorization satisfy the requirement of product to sulphur and phosphorus.

As a further improvement of the technical scheme, in the step 3), the electroslag process needs to be carried out in a protective atmosphere, and electroslag smelting at a constant melting speed is adopted.

The remelting under the protective atmosphere mainly prevents serious oxidation attenuation of silicon and carbon of molten steel due to oxidation if the secondary oxidation is serious, and the secondary oxidation of the molten steel can form more silicon dioxide inclusions to be unfavorable for controlling the molten steel inclusions.

The method develops a brand-new process path for producing the steel wire rod for the carborundum wire by the vacuum induction furnace, electroslag forging and wire rod rolling, the process path is mainly considered based on the characteristics of low demand and high requirement of the steel for the carborundum wire, the steel for the carborundum wire can be conveniently produced by small-scale organization, and the problem that the residual steel caused by the fact that the weight of the steel in each furnace is far more than the ordered quantity in the process of producing the steel by a large converter or an electric furnace can not be treated is solved. The method thoroughly realizes the complete removal of large-particle inclusions and brittle inclusions through an electroslag process, and can realize that the components of the inclusions are within the range required by the plasticization of the inclusions, thereby realizing the harmlessness of all the inclusions in steel, and avoiding the drawing and wire breaking of diamond wire. Certainly, the method has the advantages that the power consumption is large in induction furnace smelting or electroslag smelting, night production can be selected, and the capacity of a power grid in a low-peak period is fully utilized.

The technical method adopting the technical scheme has the following beneficial effects:

the steel wire rod for the superfine carborundum wire can be flexibly and stably produced on a small scale, the inclusion width in the wire rod is stably controlled to be smaller than 7 mu m, and the wire rod is ensured not to be broken due to inclusion in each process of drawing the carborundum wire.

Detailed Description

The invention provides a process for smelting steel for an ultra-fine carborundum wire, which is used for producing high-end ultra-fine carborundum wire through a new steelmaking process route design, can realize flexible and stable production of the steel for the carborundum wire, and fundamentally solves the problem of wire breakage caused by inclusion control in the subsequent carborundum wire drawing process.

The process mainly comprises the following steps;

1) smelting steel mother liquor for the superfine diamond wire by using pure iron without carbon and low-phosphorus pig iron with carbon content of 3.5-4.5% as raw materials for a vacuum induction furnace, and finally casting the steel mother liquor into a circular cast ingot;

2) the circular cast ingot is manufactured into an electrode bar for slag smelting;

3) electrode bar as raw material, electroslagThe electroslag steel ingot is manufactured by remelting and smelting in a furnace, and the slag comprises the following components in percentage by mass: CaF₂:45-55％，Al₂O₃:15-25％，SiO₂:20-25％，Na₂O:2-4％，K₂O:1-2％；

4) Forging;

5) rolling the wire rod into a wire rod with the diameter specification of 4.5-5.5mm, wherein the component requirement is as follows; [C] 0.92-1.1%, 0.3-0.4% of [ Si ], [ Mn ], [ Al ] < 0.0008%, [ N ] < 0.005%, [ S ] < 0.01%, and [ P ] < 0.015%.

The wire rod can be used for drawing the diamond wire with the diameter of 0.04-0.055mm, and the wire breakage caused by the inclusion problem in the drawing process is avoided.

Example 1:

the steel for producing the diamond wire by using a vacuum induction furnace, electroslag, forging and wire rolling comprises the following main process steps:

1) a vacuum induction furnace with the capacity of 2 tons is selected for smelting, the equipment has the function of vacuum pouring, the vacuum induction furnace uses 1.5 tons of pure iron rods without carbon and 0.5 ton of pig iron with 4 percent of carbon (the phosphorus content is less than 0.06 percent) as raw materials to be melted into 2 tons of liquid molten steel under the condition of argon protection, after the molten steel is completely melted, 10kg of lime is added, vacuum melting is started, degassing is carried out for 15min under the condition of high vacuum of less than 300Pa, 8kg of high-purity silicon iron (containing 75 percent of silicon) and 18kg of pure manganese alloy are added in the vacuum treatment process to adjust the components of the molten steel, and the smelting component [ C ]: 1.05%, [ Si ]: 0.41%, [ Mn ] 0.7%, [ Al ]: 0.00079%, [ N ]: 0.0040 percent, 0.008 percent of S and 0.014 percent of P, forming a dividing grid, adjusting the pressure in an argon blowing furnace to 10000Pa or a little higher, adjusting the temperature of molten steel to 1465 ℃, and casting into 1 round ingot under the vacuum condition, wherein the mass of a single ingot is 2 tons, the diameter of the ingot is 0.35m, and the length of the ingot is 2.8 m.

2) And (3) polishing and cleaning the surface of the round cast ingot, cutting off a large end with a contraction end by 5cm, and manufacturing the electrode rod for slag smelting.

3) The electrode bar is used as raw material and is remelted and smelted at constant melting speed in an electroslag furnace under the protective atmosphere of argon, and an electroslag system requires CaF₂:45％，Al₂O₃:25％，SiO₂:25％，Na₂O:3％，K₂2 percent of O, and electroslag smelting to manufacture a cylindrical electroslag ingot, wherein the diameter of the electroslag ingot is 0.4m, and the length of the electroslag ingot is 2 m.

4) The electroslag ingot is forged into a forging blank for rolling wires, the forging blank is a square blank, the section of the forging blank is square, the side length of the square is 0.140m, and the length of the forging blank is 12.5 m.

5) Rolling the steel wire rod into a wire rod with the diameter of 4.5mm through a wire rod. The final wire rod finished product has the following component requirements; [ C ]]:1.02％，[Si]:0.35％，[Mn]:0.6％，[Al]:0.0005％，[N]:0.0048％，[S]:0.008％，[P]0.014 percent. The inclusion of the wire rod is detected as CaF₂-CaO-SiO₂-Al₂O₃-Na₂O-K₂O composite inclusions and SiO₂-Al₂O₃-MnO-CaO-MgO-Na₂O-K₂O composite inclusions (SiO)₂Content is more than 50%), the two series of inclusions have good plasticity, the width of the inclusions is totally less than 6 mu m, the inclusions are harmless, and the inclusions do not have the wire breakage influence on the wire rod drawing diamond wire of the post-process.

The wire rod produced in the embodiment can be finally drawn into a diamond wire bus with the diameter of 0.05mm, and the continuous wire cutting is realized in the drawing process, so that the wire rod is used for cutting silicon wafers, jewels and the like with high efficiency.

Example 2:

the steel for producing the diamond wire by using a vacuum induction furnace, electroslag, forging and wire rolling comprises the following main process steps:

1) a vacuum induction furnace with the capacity of 5 tons is selected for smelting, the equipment has the function of vacuum pouring, 3.75 tons of pure iron rods of carbon-free pure iron rods and 1.25 tons of pig iron with the carbon content of 3.9 percent are used as raw materials for the vacuum induction furnace (the phosphorus content is less than 0.07 percent) and are melted into 5 tons of liquid molten steel under the condition of argon protection, after the molten steel is completely melted, 20kg of lime is added, vacuum smelting is started after vacuumizing, degassing is carried out for 20min under the high vacuum condition of less than 300Pa, 20kg of high-purity silicon iron (containing 75 percent of silicon) and 45kg of pure manganese alloy are added in the vacuum treatment process, and the smelting component [ C ] is finally: 0.96%, [ Si ]: 0.45%, [ Mn ] 0.75%, [ Al ]: 0.0009%, [ N ]: 0.0038 percent, 0.0095 percent for S, and 0.013 percent for P, after forming a dividing grid, the pressure in an argon blowing furnace is adjusted to 12000Pa or slightly higher, the temperature of molten steel is adjusted to 1485 ℃, 2 round ingots are cast under the vacuum condition, the mass of each ingot is 2.5 tons, the diameter of each ingot is 0.4m, and the length of each ingot is 2.6 m.

2) And (3) polishing and cleaning the surface of the round cast ingot, cutting off a large head with a contraction end by 6cm, and manufacturing the electrode rod for slag smelting.

3) The electrode bar is used as raw material and is remelted and smelted at constant melting speed in an electroslag furnace under the protective atmosphere of argon, and an electroslag system requires CaF₂:51％，Al₂O₃；22％，SiO₂:23％，Na₂O:3％,K₂1 percent of O, and manufacturing a cylindrical electroslag ingot by electroslag smelting, wherein the diameter of the electroslag ingot is 0.5m, and the length of the electroslag ingot is 1.5 m.

4) The electroslag ingot is forged into a forging blank for rolling wires, the forging blank is a square blank, the section of the forging blank is square, the side length of the square is 0.16m, and the length of the forging blank is 12 m.

5) Rolling the steel wire rod into a wire rod with the diameter of 5 mm. The final wire rod finished product has the following component requirements; [ C ]]:0.93％，[Si]:0.4％，[Mn]:0.5％，[Al]:0.0006％，[N]:0.0040％，[S]:0.0095％，[P]0.013 percent. The inclusion of the wire rod is detected as CaF₂-CaO-SiO₂-Al₂O₃-Na₂O-K₂O composite inclusions and SiO₂-Al₂O₃-MnO-CaO-MgO-Na₂O-K₂O composite inclusions (SiO)₂The content is more than 60 percent), the two series of inclusions have good plasticity, the width of the inclusions is totally less than 7 mu m, the inclusions are harmless, and the inclusions do not have the wire breakage influence on the wire rod drawing diamond wire of the post-process.

The wire rod produced by the embodiment can be finally drawn into a diamond wire bus with the diameter of 0.055mm, and the continuous wire is realized in the drawing process and is used for cutting silicon wafers, jewels and the like with high efficiency.

Example 3:

the steel for producing the diamond wire by using a vacuum induction furnace, electroslag, forging and wire rolling comprises the following main process steps:

1) a vacuum induction furnace with the capacity of 4 tons is selected for smelting, the equipment has the function of vacuum pouring, the vacuum induction furnace uses 3 tons of pure iron rods without carbon and 1 ton of pig iron (the phosphorus content is less than 0.06%) containing 4.2 percent of carbon as raw materials to be melted into 4 tons of liquid molten steel under the condition of argon protection, after the molten steel is completely melted, 15kg of lime is added, vacuum melting is started by vacuumizing, degassing is carried out for 18min under the condition of high vacuum below 250Pa, 15kg of high-purity ferrosilicon (containing 75 percent of silicon) and 33kg of pure manganese alloy are added in the vacuum treatment process, and the smelting component [ C ] is finally: 1.1%, [ Si ]: 0.35%, [ Mn ] 0.6%, [ Al ]: 0.0007%, [ N ]: 0.0034 percent, 0.0099 percent for S and 0.012 percent for P, forming a split grid, adjusting the pressure in an argon blowing furnace to 15000Pa or a little higher, adjusting the temperature of molten steel to 1495 ℃, and casting into 2 round cast ingots under the vacuum condition, wherein the mass of each induction furnace cast ingot is 2 tons, the diameter of the cast ingot is 0.38m (controlled to be 0.35-0.4m), and the length of the cast ingot is 2.4 m;

2) polishing and cleaning the surface of the round cast ingot, cutting off a large end with a contraction end by 8cm, and manufacturing an electrode rod for slag smelting;

3) the electrode bar is used as raw material and is remelted and smelted at constant melting speed in an electroslag furnace under the protective atmosphere of argon, and an electroslag system requires CaF₂:55％，Al₂O₃:15％，SiO₂:24％，Na₂O:4％,K₂2 percent of O, manufacturing a cylindrical electroslag ingot by electroslag smelting, wherein the diameter of the electroslag ingot is 0.45m, and the length of the electroslag ingot is 1.5 m;

4) the electroslag ingot is forged into a forging blank for rolling wires, the forging blank is a square blank, the section of the forging blank is square, the side length of the square is 0.15m, and the length of the forging blank is 10.3 m.

5) Rolling the steel wire rod into a wire rod with the diameter of 5.5mm through a wire rod. The final wire rod finished product has the following component requirements; [ C ]]:1.05％，[Si]:0.3％，[Mn]:0.5％，[Al]:0.0005％，[N]:0.0038％，[S]:0.0099％，[P]0.012 percent. The inclusion of the wire rod is detected as CaF₂-CaO-SiO₂-Al₂O₃-Na₂O-K₂O composite inclusions and SiO₂-Al₂O₃-MnO-CaO-MgO-Na₂O-K₂O composite inclusions (SiO)₂Content is more than 50%), the two series of inclusions have good plasticity, the width of the inclusions is less than 5 mu m in all, the inclusions are harmless, and the inclusions do not have the wire breakage influence on the wire rod drawing diamond wire of the post-process.

The wire rod produced by the embodiment can be finally drawn into a diamond wire bus with the diameter of 0.04mm, and the continuous wire cutting is realized in the drawing process and is used for cutting silicon wafers, jewels and the like with high efficiency.