CN111041352A - External refining production method of wire rod for cutting diamond wire - Google Patents
External refining production method of wire rod for cutting diamond wire Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
Abstract
A wire rod external refining production method for cutting diamond wires comprises the following chemical components in percentage by mass: c is more than or equal to 0.80 percent and less than or equal to 1.05 percent, Si is more than or equal to 0.4 percent and less than or equal to 0.4 percent, Mn is more than or equal to 0.6 percent and less than or equal to 0.3 percent, Cr is more than or equal to 0.1 percent and less than or equal to 0.3 percent, P is less than or equal to 0.01 percent, S is less than or equal to 0.01 percent, Al is less than or equal to 0.002 percent, Ti is less than or equal to 0.001 percent, N is less than or equal to 0. It is smeltedThe process flow comprises the following steps: deoxidizing and alloying in the converter tapping process, fully slagging off the surface of the steel ladle molten steel after tapping, and regenerating slag after slagging off; adjusting components in the LF refining process, and performing first slag adjustment after the components are in place; carrying out secondary slag regulation before the RH vacuum furnace, degassing the RH vacuum furnace to remove impurities, and obtaining the inclusion with the maximum size not more than 15 mu m and the number of the inclusions below 5 mu m accounting for more than 95 percent of the molten steel, wherein (CaO + Al) in the inclusions2O3) The content of the components is less than or equal to 30wt percent. And finally, conveying the ladle to continuous casting for pouring.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and relates to an external refining production method of a wire rod for a cutting diamond wire.
Background
The cutting diamond wire is an extremely fine steel wire with the diameter of phi 0.04-0.2mm, the diameter of the cutting diamond wire is thinner than that of a steel cord for meridian, the strength of the cutting diamond wire is higher, and the cutting diamond wire is mainly used for slicing polycrystalline silicon, monocrystalline silicon and crystal bars in the photovoltaic field. The cutting wire which is mainstream in the market at present has the specification of phi 0.11-0.12mm, and the production difficulty is high.
In order to reduce the loss of cutting silicon by the cutting diamond wire, the cutting diamond wire is developed toward a thinner diameter and a higher strength. Wire breakage is the most important problem in the processing and using process of cutting diamond wires. During production and use, hard inclusions with the diameter of more than 5 mu m can cause wire breakage when the diameter of the cutting diamond wire is 60 mu m. Therefore, the requirement for plasticizing inclusions in steel for cutting a diamond wire is extremely strict. The inclusion with good plasticity can deform and break into small-particle inclusion along with the steel matrix in the drawing process of the steel wire, and the damage of the inclusion to the cut diamond wire is effectively reduced.
Generally, the inclusions in steel for cutting diamond wire are mainly SiO2-Al2O3-MnO、SiO2-Al2O3CaO, and the conventional refining method for the inclusions of the CaO and the CaO controls the components of the inclusions to be in a low melting point region, wherein SiO2-MnO-Al2O3SiO, which is a low melting point region in which the range of the target component of the inclusion is 1300 ℃ or less2-CaO-Al2O3The range of the target component of the inclusion is a low melting point region of 1400 ℃ or less. But due to two types of clipsThe ideal low-melting-point area of impurities is narrow, so that at present, the impurities in the steel cannot be accurately and stably controlled in the plastic area by using the traditional refining method in domestic factories. The prior cutting diamond wire has high production cost, high wire breakage rate and low yield, and can not be produced in large scale.
On the basis of the traditional refining method, the invention adopts the production process of converter smelting → LF refining → RH refining → continuous casting, and can effectively control the components and types of inclusions in steel and reduce the corrosion of steel slag on RH refractory materials through two steps of slag regulation of LF refining and RH refining. Utilize the powerful degasification of RH vacuum furnace and remove the ability of inclusion, can also control the quantity and the size of inclusion in the steel better, improve molten steel cleanliness factor, finally promote cutting diamond wire product quality.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an external refining production method of a wire rod for cutting a diamond wire, which comprises the following chemical components in percentage by mass: c is more than or equal to 0.80 percent and less than or equal to 1.05 percent, Si is more than or equal to 0.4 percent and less than or equal to 0.4 percent, Mn is more than or equal to 0.6 percent and less than or equal to 0.3 percent, Cr is more than or equal to 0.1 percent and less than or equal to 0.3 percent, P is less than or equal to 0.01 percent, S is less than or equal to 0.01 percent, Al is less than or equal to 0.002 percent, Ti is less than or equal to 0.001 percent, N is less than or equal to 0. Firstly, carrying out converter smelting, carrying out deoxidation alloying in the converter tapping process, and slagging after fully slagging off the surface of steel ladle molten steel after tapping is finished; adjusting components in the LF refining process, and performing first slag adjustment after the components are in place; and carrying out secondary slag regulation before the RH vacuum furnace, degassing and removing impurities in the RH vacuum furnace, and then conveying to continuous casting for pouring.
The method comprises the following steps:
(1) tapping by a converter: deoxidizing and alloying in the converter tapping process, skimming the surface of the molten steel after tapping, and adding synthetic slag and SiC for slagging after skimming;
(2) LF refining: hoisting the molten steel obtained in the step (1) into an LF furnace for treatment, adding alloy and a low-nitrogen carburant for component adjustment, adding synthetic slag for first slag adjustment after the components are hit, then adding SiC for slag surface diffusion deoxidation, and controlling the alkalinity of refining slag to be 0.65-1.10;
(3) RH vacuum treatment: adding lime before the molten steel obtained in the step (2) is hoisted into an RH vacuum furnace, carrying out secondary slag mixing, controlling the alkalinity of refining slag to be 1.10-1.55, and then carrying out vacuum treatment on the molten steel, degassing and removing impurities;
(4) and hoisting the molten steel after the vacuum treatment to a continuous casting platform for casting.
Preferably, in the deoxidation alloying stage in the converter tapping process, the adding sequence of the raw materials and the auxiliary materials is as follows in sequence: manganese metal, low-titanium low-aluminum ferrosilicon and a low-nitrogen carburant; al in the low-titanium low-aluminum ferrosilicon is less than or equal to 0.05 percent, Ti is less than or equal to 0.01 percent, and N in the low-nitrogen carburant is less than or equal to 0.05 percent.
Preferably, the surface of the steel ladle molten steel is fully skimmed after tapping, the skimming rate is more than 95%, the synthetic slag and SiC are added into the steel ladle after the skimming, the adding amount of the synthetic slag is 3-5kg/t, and the adding amount of the SiC is 0.5-1.0 kg/t.
Preferably, after the components of the molten steel in the LF process hit, 5-7kg/t of synthetic slag is added, 1.0-1.5kg/t of SiC is added for slag surface diffusion deoxidation, slag is adjusted for the first time, and the alkalinity of the refined slag is controlled to be 0.65-1.10.
Preferably, the alkalinity of the synthetic slag is 0.75-1.20, the CaO component content is 38% -49%, and SiO is241-51 percent of component and Al2O3The content of the components is less than or equal to 5 percent, and other inevitable impurities.
Preferably, 0.8-1.5kg/t lime is added before the ladle is hoisted into the RH vacuum furnace, slag is secondarily adjusted, and the alkalinity of the refining slag is controlled to be 1.10-1.55.
Preferably, in the RH vacuum treatment stage, the pressure in the vacuum chamber is less than or equal to 100Pa, and the RH vacuum treatment time is more than or equal to 20 minutes.
Preferably, the lift gas flow during RH this process is 150-.
Preferably, after degassing and removing inclusions in the RH vacuum furnace, the maximum size of inclusions in the molten steel is not more than 15 μm, the number of inclusions below 5 μm accounts for more than 95%, and (CaO + Al) in the inclusions2O3) The content of the components is less than or equal to 30wt percent. And finally, conveying the ladle to continuous casting for pouring.
The principle of the smelting process of the invention is as follows:
Al2O3when hard impurities are contained, the cutting diamond wire is easy to break in the production, processing and using processes, so the steel for cutting the diamond wire has Al content and Al content in the steel2O3The inclusion is strictly controlled. The steel for cutting diamond wire by the traditional process is deoxidized by Si and Mn, and the generated deoxidized product is mainly MnO-Al2O3-SiO2. As the reaction proceeds, the molten steel and the slag react to generate CaO-Al2O3-SiO2So that the inclusions in the steel are mainly SiO2-Al2O3MnO and SiO2-Al2O3CaO in two categories. And SiO2-Al2O3MnO and SiO2-Al2O3The low melting point region of the CaO and the CaO is narrow, and the final composition of the inclusion is difficult to control accurately.
In order to solve the problems, the invention adopts the process flows of converter smelting → LF refining → RH refining → continuous casting for production. And fully slagging off the molten steel of the steel ladle after tapping, so as to prevent the phosphorus content from exceeding the standard due to rephosphorization of the molten steel. And after slagging off is finished, part of the synthetic slag is added to absorb impurities floating in the steel and reduce molten steel peroxidation. Adding SiC for diffusion deoxidation, and reducing the oxidability of the refining slag. In the LF refining process, after the components of molten steel hit, the synthetic slag is added again for first slag adjustment, and the alkalinity is controlled to be 0.65-1.10, so that the inclusion absorption and removal in the refining process are facilitated. And adding SiC again for diffusion deoxidation to reduce the oxygen content in the steel. In order to reduce the corrosion of the refining slag to RH resistant materials and ensure the absorption and control of inclusions in steel, lime is added before RH is added, slag is adjusted for the second time, and the alkalinity is controlled to be 1.10-1.55. And then RH treatment is carried out, degassing is carried out, the removal of inclusions is enhanced, and the cleanliness of molten steel is improved. Degassing in an RH vacuum furnace to remove inclusions, and obtaining the inclusion with the maximum size not more than 15 mu m in molten steel, the number of the inclusions below 5 mu m accounting for more than 95 percent, and (CaO + Al) in the inclusions2O3) The content of the components is less than or equal to 30wt percent. And finally, conveying the ladle to continuous casting for pouring.
Advantageous effects
On the basis of the traditional refining method, the invention adopts the production process of converter smelting → LF refining → RH refining → continuous casting, and can effectively control the components and types of inclusions in steel and reduce the corrosion of steel slag on RH refractory materials through two steps of slag regulation of LF refining and RH refining. Utilize the powerful degasification of RH vacuum furnace and remove the ability of inclusion, can also control the quantity and the size of inclusion in the steel better, improve molten steel cleanliness factor, finally promote cutting diamond wire product quality. The invention is suitable for industrial large-scale production, greatly improves the production efficiency and reduces the production cost.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
a120 t converter is used for smelting, and the production steps are as follows:
(1) tapping by a converter: and in the converter tapping process, metal manganese, low-titanium low-aluminum ferrosilicon and a low-nitrogen carburant are sequentially added for deoxidation alloying. And fully skimming the surface of the molten steel after tapping, and adding synthetic slag and SiC for slagging after skimming. The converter tapping process parameters and the synthetic slag components are shown in tables 1 and 2.
TABLE 1 converter tapping Process parameters
| Furnace number | Slag skimming rate/wt% | Synthetic slag/kg/t | SiC addition/kg |
| (d) | 95 | 5 | 120 |
| (e) | 98 | 3 | 60 |
| (f) | 96 | 4 | 60 |
TABLE 2 composition of the synthetic slag
| Furnace number | Slag basicity | CaO/wt％ | SiO2/wt％ | Al2O3/wt％ |
| (d) | 1.20 | 49 | 41 | 4 |
| (e) | 0.90 | 42 | 47 | 5 |
| (f) | 0.75 | 38 | 51 | 3 |
(2) LF refining: and (2) hoisting the molten steel obtained in the step (1) into an LF furnace, electrifying to raise the temperature, adding alloy and a low-nitrogen carburant to adjust the components, adding synthetic slag to perform first slag adjustment after the components are hit, then adding SiC to perform slag surface diffusion deoxidation, and controlling the alkalinity of the refining slag to be 0.65-1.10. The addition amount of the alloy in the refining process is shown in Table 3, the LF slag-adjusting condition is shown in Table 4, and the refining slag components are shown in Table 5.
TABLE 3 LF refining alloy additions
| Furnace number | Low nitrogen carburant/kg | Manganese metal/kg | Low-titanium low-aluminum silicon iron/kg |
| (d) | 50 | 166 | 55 |
| (e) | 25 | 142 | 82 |
| (f) | 30 | 110 | 36 |
TABLE 4 LF slag Condition
| Furnace number | SiC addition/kg | Synthetic slag/kg/t |
| (d) | 100 | 5 |
| (e) | 150 | 7 |
| (f) | 100 | 6 |
TABLE 5 LF refining slag composition
| Furnace number | Slag basicity | CaO/wt％ | SiO2/wt％ | Al2O3/wt％ |
| (d) | 1.10 | 46 | 42 | 4 |
| (e) | 0.87 | 42 | 48 | 5 |
| (f) | 0.65 | 35 | 54 | 3 |
(3) RH vacuum refining: adding 0.8-1.5kg/t lime before the ladle is hoisted into the RH vacuum furnace, carrying out secondary slag adjustment, and controlling the alkalinity of the refining slag to be 1.10-1.55. After the molten steel is hung into the RH vacuum furnace, the molten steel is degassed and inclusion-removed under the high vacuum condition, and feeding before the RH station, refining slag components when the RH station, the vacuum furnace processing parameters and inclusion control parameters are shown in tables 6, 7, 8 and 9.
TABLE 6 lime addition before arrival at the station
| Furnace number | CaO addition/kg |
| (d) | 96 |
| (e) | 150 |
| (f) | 180 |
TABLE 7 RH compositions of refining slag to station
| Furnace number | Slag basicity | CaO/wt％ | SiO2/wt％ | Al2O3/wt％ |
| (d) | 1.55 | 57 | 37 | 3 |
| (e) | 1.34 | 53 | 40 | 4 |
| (f) | 1.10 | 48 | 44 | 5 |
TABLE 8 vacuum furnace processing parameters
| Vacuum device | RH | RH | RH |
| Parameter information/furnace number | (d) | (e) | (f) |
| Degree of vacuum/Pa | 50 | 100 | 60 |
| High vacuum time/min | 30 | 25 | 27 |
| Lift gas flow/NL/min | 250 | 180 | 150 |
TABLE 9 inclusion control parameters
| Furnace number | Maximum size/. mu.m | Inclusion proportion of 5 μm or less (1 μm or more)/% | (CaO+Al2O3)/wt％ |
| (d) | 15 | 97 | 30 |
| (e) | 13 | 95 | 25 |
| (f) | 10 | 98 | 29 |
(4) And (4) conveying the molten steel after the vacuum treatment to a continuous casting platform for casting, and then carrying out the next procedure.
The molten steel is cast into a blank through the existing continuous casting machine, and the obtained blank is subjected to the existing procedures of high-speed rolling, continuous rolling and cooling control, so that a high-quality product is obtained, the production efficiency is improved, the production cost is reduced, and the industrial large-scale production is realized.
Claims (9)
1. A wire rod external refining production method for cutting diamond wires comprises the following chemical components in percentage by mass: c is more than or equal to 0.80 percent and less than or equal to 1.05 percent, Si is more than or equal to 0.4 percent and less than or equal to 0.4 percent, Mn is more than or equal to 0.6 percent and less than or equal to 0.3 percent and less than or equal to 0.1 percent and less than or equal to 0.3 percent, P is less than or equal to 0.01 percent, S is less than or equal to 0.01 percent, Al is less than or equal to 0.002 percent, Ti is less than or equal to 0.001 percent, N is less than or equal to 0.003 percent and less than or equal to 0.002 percent, and the balance is Fe and other inevitable impurities, and the method:
(1) tapping by a converter: deoxidizing and alloying in the converter tapping process, skimming the surface of the molten steel after tapping, and adding synthetic slag and SiC for slagging after skimming;
(2) LF refining: hoisting the molten steel obtained in the step (1) into an LF furnace for treatment, adding alloy and a low-nitrogen carburant for component adjustment, adding synthetic slag for first slag adjustment after the components are hit, then adding SiC for slag surface diffusion deoxidation, and controlling the alkalinity of refining slag to be 0.65-1.10;
(3) RH vacuum treatment: adding lime before the molten steel obtained in the step (2) is hoisted into an RH vacuum furnace, carrying out secondary slag mixing, controlling the alkalinity of refining slag to be 1.10-1.55, and then carrying out vacuum treatment on the molten steel, degassing and removing impurities;
(4) and hoisting the molten steel after the vacuum treatment to a continuous casting platform for casting.
2. The external refining production method of the wire rod for cutting diamond wires according to claim 1, characterized in that in the deoxidation alloying stage of the converter tapping process, the adding sequence of raw materials and auxiliary materials is as follows: manganese metal, low-titanium low-aluminum ferrosilicon and a low-nitrogen carburant; al in the low-titanium low-aluminum ferrosilicon is less than or equal to 0.05 percent, Ti is less than or equal to 0.01 percent, and N in the low-nitrogen carburant is less than or equal to 0.05 percent.
3. The external refining production method of the wire rod for cutting diamond wire according to claim 1, wherein the slagging-off is performed on the surface of molten steel after tapping of the converter, the slagging-off rate is more than 95%, synthetic slag and SiC are added into the steel ladle after slagging-off, the addition amount of the synthetic slag is 3-5kg/t, and the addition amount of the SiC is 0.5-1.0 kg/t.
4. The method for refining and producing a wire rod for a cutting diamond wire outside a furnace as claimed in claim 1, wherein after the molten steel component in the LF process is hit, 5-7kg/t of synthetic slag is added, 1.0-1.5kg/t of SiC is added for slag surface diffusion deoxidation, slag adjustment is performed for the first time, and the alkalinity of the refining slag is controlled to be 0.65-1.10.
5. The synthetic slag according to any one of claims 3 and 4, wherein the basicity of the synthetic slag is 0.75-1.20, the content of CaO component is 38% -49%, and SiO is241-51 percent of component and Al2O3The content of the components is less than or equal to 5 percent, and the other components are inevitable impurities.
6. The secondary refining production method of the wire rod for the cutting diamond wire as claimed in claim 1, wherein 0.8-1.5kg/t lime is added before the steel ladle is hung in the RH vacuum furnace, slag is adjusted for the second time, and the alkalinity of the refining slag is controlled to be 1.10-1.55.
7. The secondary refining production method of wire rod for cutting diamond wire as recited in claim 1, wherein in the RH vacuum treatment stage, the pressure in the vacuum chamber is less than or equal to 100Pa and the treatment time is more than or equal to 20 minutes.
8. The method for refining and producing a wire rod for a cutting diamond wire outside a furnace as claimed in claim 1, wherein the lift gas flow rate is 150-250NL/min during the RH treatment process.
9. The method for producing a wire rod for a cutting diamond wire by external refining as claimed in claim 1, wherein the inclusions are removed by degassing in an RH vacuum furnace, the maximum size of the inclusions in the molten steel is not more than 15 μm, the number of inclusions below 5 μm is more than 95%, and the inclusions (CaO + Al) are2O3) The content of the components is less than or equal to 30wt percent. And finally, conveying the ladle to continuous casting for pouring.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022082900A1 (en) * | 2020-10-22 | 2022-04-28 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 5000 mpa grade diamond wire and production method therefor |
| WO2023151228A1 (en) * | 2022-02-10 | 2023-08-17 | 张家港荣盛特钢有限公司 | Method for controlling brittle inclusions of tire cord steel |
| CN117568700A (en) * | 2024-01-10 | 2024-02-20 | 江苏省沙钢钢铁研究院有限公司 | Preparation method of high-purity diamond wire cast ingot |
| CN117568700B (en) * | 2024-01-10 | 2024-04-19 | 江苏省沙钢钢铁研究院有限公司 | Preparation method of high-purity diamond wire cast ingot |
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| CN117568700A (en) * | 2024-01-10 | 2024-02-20 | 江苏省沙钢钢铁研究院有限公司 | Preparation method of high-purity diamond wire cast ingot |
| CN117568700B (en) * | 2024-01-10 | 2024-04-19 | 江苏省沙钢钢铁研究院有限公司 | Preparation method of high-purity diamond wire cast ingot |
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