CN109881121B - Chloride ion corrosion-resistant high-strength anti-seismic reinforcing steel bar and production method and application thereof - Google Patents
Chloride ion corrosion-resistant high-strength anti-seismic reinforcing steel bar and production method and application thereof Download PDFInfo
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- 229910001294 Reinforcing steel Inorganic materials 0.000 title abstract description 11
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a chloride ion corrosion resistant high-strength anti-seismic reinforcing steel bar and a production method and application thereof, wherein the reinforcing steel bar contains the following elements in percentage by weight: ni is less than or equal to 0.65 percent, Cr is 0.25 to 7.00 percent, V is 0.028 to 0.029 percent, Mn is less than or equal to 1.4 percent, and Ni/Cr is 0.45 to 1.92 percent. In the method, the converter is smelted according to the conventional smelting process, and corrosion-resistant alloy elements such as Cr, Ni, V and the like are added into the molten steel according to the conventional operation mode. The content of oxygen, sulfur and impurities in steel is reduced by refining white slag in an LF furnace. The continuous casting crystallizer adopts an electromagnetic stirring technology, and can realize production in most domestic steel bar production plants. Compared with the prior art, the chloride ion corrosion resistant high-strength anti-seismic reinforcing steel bar is produced by adopting a nickel-chromium-vanadium microalloying process, and has the characteristics of accurate control of molten steel components, high yield, easy operation, wide applicability and the like.
Description
Technical Field
The invention belongs to the field of metallurgy, and particularly relates to a chloride ion corrosion-resistant high-strength anti-seismic reinforcing steel bar and a production method and application thereof.
Background
At present, the corrosion-resistant steel bars mainly comprise stainless steel bars, epoxy resin-coated steel bars, galvanized steel bars, stainless steel composite steel bars, alloy corrosion-resistant steel and the like.
The method for producing the chloride ion corrosion resistant high-strength anti-seismic reinforcing steel bar in China mainly adopts laterite-nickel ore, sea placer and copper slag to produce high-nickel ferrochrome water, utilizes the high-nickel ferrochrome water to produce the corrosion resistant reinforcing steel bar at low cost, and has a smelting process different from a microalloying process.
The production process for producing the chloride ion corrosion resistant high-strength anti-seismic reinforcing steel bar by using the laterite-nickel ore, the sea placer and the copper slag is complex, and particularly has high requirements on blast furnace operation and difficult stabilization of furnace conditions. The process for smelting the laterite-nickel ore by the blast furnace has the defects of poor adaptability to raw materials, low nickel-containing yield of the obtained pig iron, high P, S content in molten iron, large unstable pig iron component fluctuation of the production process and the like.
The invention relates to a method for preparing a chloride ion corrosion-resistant stainless steel bar, which comprises the steps of performing thermal diffusion technology on a prefabricated stainless steel bar blank to form a stainless steel surface layer with chemical components meeting the requirements of stainless steel and excellent corrosion resistance on the surface of the steel bar, performing surface treatment on the steel bar blank, and adding Cr into the surface of the steel bar through the thermal diffusion technology to achieve the purpose of corrosion resistance. However, the preparation of the thermal diffusion powder and the preparation method of the reinforcing steel bar are extremely complex in process and extremely high in cost.
Chinese patent application CN 107034418A discloses a chloride ion corrosion resistant high-strength steel bar and a production method thereof, the steel bar contains 0.5-0.9% of Cr, 0.26-0.40% of Ni and 0.01-0.05% of V, but the Ni/Cr is too low and is below 0.41, which affects the corrosion resistance of the steel; in addition, the content of C is low, the oxidability of molten steel is strong, and the quality of the molten steel is poor. The oxygen is mainly FeO, MnO and SiO in the steel2、Al2O3And the inclusion forms such as the steel, which reduce the strength and plasticity of the steel, especially have serious influence on the fatigue strength, the impact toughness, the welding performance and the like. In addition, the addition of Cu and rare earth Re has high production cost and poor practicability.
Disclosure of Invention
In order to overcome the defects of the existing corrosion-resistant high-strength steel bar, the invention mainly aims to provide the steel bar which is characterized in that low-nickel low-chromium low-vanadium molten iron is smelted to obtain the high-nickel-chromium steel bar, and the corrosion resistance and the mechanical property are improved.
The invention also aims to provide a production method of the steel bar.
It is a further object of the present invention to provide the use of the above-described rebar.
The purpose of the invention is realized by the following technical scheme:
the steel bar comprises the following elements in percentage by weight: ni is less than or equal to 0.65 percent, Cr is 0.25 to 7.00 percent, V is 0.028 to 0.029 percent, Mn is less than or equal to 1.4 percent, and Ni/Cr (the content ratio of Ni to Cr elements) is 0.45 to 1.92;
preferably, the Ni/Cr is 1.92;
preferably, the Mn content is 1.3%;
the invention smelts low nickel-chromium molten iron through the converter, adopt nickel chromium vanadium to microalloy, the high nickel-chromium ratio produces the high strength antidetonation reinforcing bar of resisting chloride ion corrosion.
The Ni can enable the steel bar to have high strength, high toughness, high resistance, good hardenability and corrosion resistance, particularly has extraordinary corrosion resistance to chloride ions and halogen ions, and can obviously reduce the self-corrosion rate of the steel bar. Meanwhile, Ni element is easy to accumulate in the rust layer to form a protective rust layer which can resist Cl to a certain extent-Thereby reducing the corrosion rate of the steel.
Cr element can improve the oxidation resistance and oxidation resistance of the steel bar, can form a compact and complete oxidation film between the rust layer on the surface of the steel and the steel matrix, can effectively inhibit the invasion of corrosive anions, particularly Cl ions, and has poorer corrosion resistance compared with the corrosion resistance of Ni.
The V element can refine the structure and the crystal grains of the steel and improve the coarsening temperature of the crystal grains, thereby playing a role in enhancing the strength, the toughness and the wear resistance of the steel, and simultaneously, the V also improves the corrosion resistance of the steel bar.
Although both Ni and Cr have corrosion resistance, the difference between Ni and Cr is large. As the Ni/Cr content is increased, the average corrosion rate of the steel bar is linearly reduced, and the corrosion resistance of the steel bar is improved. When the ratio is 0.45, the corrosion rate is 0.70, and the requirement of GB/T33953-2017 on corrosion resistance is met. When the ratio is 1.92, the corrosion rate is 0.43, and the optimal corrosion rate is achieved. Practices show that the Ni/Cr is between 0.45 and 1.92, so that the corrosion-resistant steel bar can be produced at low cost.
The steel bar also contains the following elements in percentage by weight: c is more than or equal to 0.16 percent and less than or equal to 0.21 percent, Si is less than or equal to 0.80 percent, P is less than or equal to 0.03 percent, and S is less than or equal to 0.03 percent.
The production method of the steel bar comprises the following steps:
(1) smelting in a converter: adding molten iron and scrap steel, and adding alloy after calculation according to the ratio range of the elements for smelting;
the temperature control parameters in the smelting process are shown in the following table:
(2) refining in an LF furnace: adding submerged arc slag and fluorite after molten steel enters a station, electrifying for 1-2min, adding 2/3 of the total amount of lime, adding the rest lime, carbon powder, a ladle modifier, refined synthetic slag and calcium carbide after the slagging materials are completely melted, then electrifying for refining, and blowing argon; adjusting the alkalinity of the slag to 2.5-3.0, maintaining the reducing atmosphere and good fluidity of the slag, ensuring that (FeO + MnO) in the slag is less than 1.0 percent, FeO is less than O.5 percent, and the color of the slag is white; adding alloy according to the condition when the molten steel is out of the station, and finely adjusting the molten steel components according to the proportion of the elements; the refining time is ensured to be more than 35 minutes;
the addition amount of each slagging material is as follows:
submerged arc slag: 2.6-2.8 kg/ton molten steel;
fluorite: 0.3-0.5 kg/ton molten steel;
lime: 6-7 kg/ton molten steel;
a steel ladle modifier: 0.5 kg/ton molten steel;
refining synthetic slag: 1-2 kg/ton molten steel;
calcium carbide: 0.3-0.5 kg/ton molten steel;
carbon powder: 10-30 kg;
the alkalinity of the slag refers to the ratio of basic oxides to acidic oxides, and the calculation formula is as follows:
R＝(CaO+MgO)/(SiO2+Al2O3)；
the step is a refining white slag making method groped by a refining engineer. The white slag and inert atmosphere are used for protection and stirring, and oxygen, sulfur and impurities can be easily removed. The (FeO + MnO) in the slag is less than or equal to 1.0 percent, and the reduction is sufficient, which is the premise of desulfurization and impurity removal. At this time, the oxygen content and the inclusion in the steel are the least, and the cleanliness of the steel is the highest.
The step mainly solves the defects of high oxygen content and many inclusions in CN 107034418A. Because the steel smelting is carried out by oxidation reaction through oxygen, carbon, silicon, phosphorus and sulfur in the molten iron are oxidized to form oxides, and then deoxidized through deoxidation of silicon-manganese alloy, silicon-iron alloy, silicon-aluminum-barium or silicon-calcium-barium and the like to form molten steel with high cleanliness. The oxygen content is high or low in relation to the carbon content. The carbon is low, and the steel oxygen content is high; high carbon content and low oxygen content in steel. High oxygen content, low molten steel purity and great influence on the mechanical property and welding property of steel. High-cleanliness steel is pursued by steel enterprises.
The alloy in the steps (1) and (2) comprises silicon-manganese alloy, silicon-iron alloy, vanadium-nitrogen alloy, high-carbon ferrochrome, ferronickel, silicon-aluminum-barium and silicon-calcium-barium;
(3) continuous casting: carrying out electromagnetic stirring and continuous casting to obtain a billet;
the electromagnetic stirring is carried out, the current is 300A, and the frequency is 5 Hz. The continuous casting of the invention adopts the electromagnetic stirring technology, can effectively improve the internal organization structure of the casting blank, increase the isometric crystal rate and lead the inclusion to float upwards, thus obtaining good billet quality.
The continuous casting is characterized in that the drawing parameters are controlled as follows:
| degree of superheat deg.C | <15 | 15～25 | 25～35 | 35～45 | >45 |
| Pulling speed m/min | 3.60～3.70 | 3.50～3.60 | 3.20～3.50 | 2.90～3.20 | ≥2.70 |
In the continuous casting, parameters of a water distribution link are controlled as shown in the following table:
| specific water amount | [m3/h] |
| |
≤4.0 |
| Zone 2 | ≤6.0 |
| |
≤2.0 |
| Zone 4 | ≤0.5 |
In the continuous casting step, dynamic water distribution is adopted, so that the drawing speed is properly reduced, and the reduction of billet cracks is facilitated.
(4) Rolling:
heating temperature: the rod material is 1070-1084 ℃ and the disc snail is 1080-1087 ℃;
the temperature of a cooling bed on the bar is 900-935 ℃, and the spinning temperature of the spiral is 900-935 ℃;
rolling speed: the rod is 12.2-15.5 m/s, and the spiral is 45 m/s.
The steel bar can be applied to buildings and projects with the requirements of earthquake resistance and/or chloride ion corrosion resistance.
Compared with the prior art, the invention has the following advantages and effects:
1. the production method adopts a route of a blast furnace (coke and ore) → molten iron (low nickel, low chromium and low vanadium) → converter (nickel chromium and vanadium microalloying) → CAS (argon blowing and wire feeding) → LF (secondary refining) → continuous casting (electromagnetic stirring and automatic water distribution) → rolling mill → bar material, and obtains the steel bar with good mechanical property and corrosion resistance by optimizing a converter smelting process, a microalloying process, an LF furnace refining impurity removal process, continuous casting electromagnetic stirring and automatic water distribution process, and optimizing hot rolling processes such as hot rolling open rolling temperature, a screw-down system, post-rolling controlled cooling and the like.
2. In the method, the converter is smelted according to the conventional smelting process, and corrosion-resistant alloy elements such as Cr, Ni, V and the like are added into the molten steel according to the conventional operation mode. The content of oxygen, sulfur and impurities in steel is reduced by refining white slag in an LF furnace. The continuous casting crystallizer adopts an electromagnetic stirring technology, and can realize production in most domestic steel bar production plants. Compared with the prior art, the chloride ion corrosion resistant high-strength anti-seismic reinforcing steel bar is produced by adopting a nickel-chromium-vanadium microalloying process, and has the characteristics of accurate control of molten steel components, high yield, easy operation, wide applicability and the like.
3. The invention produces high-strength Cl-resistant steel-The mechanical properties of the corroded steel bar meet the requirements of GB/T1499.2-2018, the yield strength ReL is more than or equal to 400MPa, the tensile strength Rm is more than or equal to 540MPa, the elongation A after fracture is more than or equal to 16 percent, and the Cl-corrosion resistance is 1.66 times and more than that of the HRB400 common steel bar. The corrosion-resistant alloy elements such as Cr, Ni, V and the like are added in a small amount in the formula of the steel bar, the production cost is low, the production process is simple, the service life of a building structure can be greatly prolonged by using the chlorine ion corrosion-resistant high-strength steel bar, the maintenance cost of the building structure is reduced, the building cost is reduced, and the market prospect is good.
4. Compared with the method for obtaining the high-nickel ferrochrome water by smelting laterite nickel ore and sea sand ore in a blast furnace, the method has stable blast furnace smelting operation and is beneficial to maintaining the furnace life.
5. The invention obtains the stable structure state of ferrite and pearlite by cooling control after rolling.
Drawings
FIG. 1 shows the effect of Mn content on the corrosion rate of steel bars.
FIG. 2 is a graph showing the effect of Ni/Cr on the corrosion rate of steel bars.
FIG. 3 is a metallographic examination of the steel reinforcement (3% nitric acid etching with alcohol, 100 times magnification).
FIG. 4 is a graph of corrosion rates for vanadium containing and vanadium free steel samples.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
A method for producing a reinforcing bar, comprising the steps of:
(1) smelting in a converter: adding molten iron and scrap steel, according to the ratio of each element, Ni is less than or equal to 0.65 percent, Cr is 0.25-7.00 percent, V is 0.028-0.029 percent, Ni/Cr is 0.45-1.92 percent, C is more than or equal to 0.16 percent and less than or equal to 0.21 percent, Si is less than or equal to 0.80 percent, Mn is less than or equal to 1.4 percent, P is less than or equal to 0.03 percent, and S is less than or equal to 0.03 percent, calculating and adding alloy for smelting;
the alloy comprises silicon-manganese alloy, silicon-iron alloy, vanadium-nitrogen alloy, high-carbon ferrochrome, ferronickel, silicon-aluminum-barium and silicon-calcium-barium;
the temperature control parameters in the smelting process are shown in the following table:
(2) refining in an LF furnace:
324kg of submerged arc slag and 40kg of fluorite are added after molten steel (about 120 tons of molten steel in each furnace) enters a station, and then lime is added, wherein the lime is added in two batches, so that all added lime can be completely dissolved. The steps of adding lime in portions are as follows: 2/3 (541 kg) of the total amount of lime is added after 1-2min from the start of electrification; after the slagging material added for the first time is completely melted, adding the rest of the lime 271kg, the carbon powder 30kg, the steel ladle modifier 66kg, the refined synthetic slag 216kg and the calcium carbide 40kg, then carrying out power transmission refining, and blowing in argon gas; the alkalinity is adjusted to 2.5-3.0, the reducing atmosphere and the good fluidity of the slag are maintained, and the slag is ensured to have (FeO + MnO) < 1.0%, FeO < O.5%, and the color of the slag is white. Adding alloy according to the condition when the alloy is out of the station, and finely adjusting the components of the molten steel according to the proportion range of the elements; the refining time is ensured to be more than 35 minutes. And feeding SiCaBa wire when the wire is out of the station, and blowing argon for 4 minutes in a soft mode.
(3) Continuous casting:
A. electromagnetic stirring parameters: current: 300A; frequency: 5 Hz.
B. And (4) protecting and pouring by using a long nozzle, and unloading the long nozzle when the left 5 tons of the ladle is weighed.
C. The molten steel of the tundish is not exposed, and the liquid level of the molten steel of the tundish is kept 650 mm.
D. The lower water gap is immersed into the crystallizer, and the depth of the steel water is 90-110 mm.
E. The water flow of the crystallizer is controlled at 153m3And h, molten steel in the crystallizer is not exposed, slag is added frequently and slag picking rings are arranged.
F. The drawing schedule is shown in the following table:
| degree of superheat deg.C | <15 | 15～25 | 25～35 | 35～45 | >45 |
| Pulling speed m/min | 3.60～3.70 | 3.50～3.60 | 3.20～3.50 | 2.90～3.20 | ≥2.70 |
G. Automatic water distribution:
| specific water amount | [m3/h] |
| |
≤4.0 |
| Zone 2 | ≤6.0 |
| |
≤2.0 |
| Zone 4 | ≤0.5 |
(4) Rolling:
producing the deformed steel bar with the phi of 18mm, heating at 1076-1084 ℃, and cooling on a cooling bed: 900-935 ℃, rolling speed: 12.2m/s, negative tolerance of-2.3% to-2.5%.
Producing the deformed steel bar with the phi 16mm specification, wherein the heating temperature is 1070-1080 ℃, and the temperature of an upper cooling bed is as follows: and (3) rolling at 910-925 ℃ at a rolling speed: 15.2m/s, negative tolerance of-2.5% to-2.9%.
Producing the phi 12mm coiled snails, wherein the heating temperature is 1080-1087 ℃, the spinning temperature is 900-935 ℃, and the rolling speed is as follows: 45m/s and an inner diameter of 7.7-7.9 mm. And a stelmor delayed cooling process is adopted, the cooling speed is controlled to be 3-5 ℃/s, and the negative tolerance is-0.5% -1.0%.
Producing the deformed steel bar with the phi of 20mm, wherein the heating temperature is 1080-1084 ℃, and the temperature of an upper cooling bed is as follows: 900-920 ℃, rolling speed: 15.5m/s, negative tolerance of-2.0% to-3.0%.
Under the condition of certain content of other elements, the content of Mn element is changed, the influence of Mn element on the corrosion rate of the steel bar is researched, and the result is shown in figure 1, as the content of Mn in the steel bar is increased (from 0.7% to 1.3%), the corrosion rate of the steel bar is reduced along with the increase of time, so that the content of Mn is designed to be 1.30%, and compared with the content of Mn in the existing published production method, the content of Mn element is high, and the corrosion rate is favorably reduced by using more components.
Under the condition of constant content of other elements, the content ratio of the elements Ni and Cr (namely Ni/Cr) is changed, the influence of the content ratio on the corrosion rate of the steel bar is researched, and the result is shown in figure 2, wherein the corrosion rate of the steel bar is reduced and the corrosion resistance is improved along with the increase of the Ni/Cr. The Ni/Cr content design of the invention is more reasonable than the Ni/Cr content design of the prior published production method, and is more beneficial to reducing the corrosion rate.
Example 2
The technological operation of a method for producing a steel bar is the same as that of example 1, except that the specific content of the alloy element is used. The method specifically comprises the following steps: 0.20% of C, 0.50% of Si, 1.30% of Mn, 0.018% of P, 0.011% of S, 0.49% of Cr, 0.32% of Ni, 0.029% of V, and the balance of Fe and inevitable impurity elements.
After the step (3) is finished, performing macroscopic structure detection on the obtained steel billet, wherein the result is as follows: the total number of stages is 1.0 stage. The center porosity was 0.5 grade, and the corner cracks were 0.5 grade.
Metallographic structure detection was performed on the obtained steel bars, and the results are shown in fig. 3: the matrix structure of the sample is F and P, the grain size is 8.5-9.5 grade, and the metallographic structure requirement of the hot-rolled ribbed steel bar for GB/T1499.2-2018 reinforced concrete is met.
After the step (4) is finished, performing mechanical property detection on the obtained steel bar (the result is shown in table 1): the lower yield strength Rel is 430-460 Mpa, the tensile strength Rm is 605-660 Mpa, Rm0/ReL0The ratio of (A) to (B) is between 1.315 and 1.535, and Rm meeting the national standard requirement0/ReL0>1.25；ReL0The ratio of ReL is between 1.075 and 1.15, and ReL meeting the national standard requirement0/ReL<1.30; the elongation after fracture is between 17.0% and 30%, and the requirement of 16% of the national standard requirement is met; the maximum force total elongation Agt is between 10.05 percent and 13.94 percent, meets the requirement of 9.0 percent of the national standard requirement, and the mechanical property indexes all meet the requirement of GB/T1499.2-2018.
Two batches of the corrosion-resistant steel bars of the embodiment and one batch of the steel sample of the prior art common HRB4000E are sent to the national key laboratory of Beijing Steel research institute for corrosion rate detection. The detection result is as follows:
the average corrosion rate of the corrosion-resistant steel bars of the first batch (HRB400cE) is 3.01-3.26g/m.2h, the average value is 3.51g/m.2h, the average corrosion rate of the corrosion-resistant steel bars of the second batch (HRB400cE) is 3.22-3.99g/m.2h, the average value is 3.66g/m.2h, the average corrosion rate of the common twisted steel bars of the third batch (HRB400E) is 4.96-5.54g/m.2h, and the average value is 5.28 g/m.2h.
The relative corrosion rate of the first batch (HRB400cE) is 66.53%, the relative corrosion rate of the second batch (HRB400cE) is 69.32%, the relative corrosion rates are lower than 70% of the relative corrosion rate requirement of the corrosion-resistant steel bars in GB/T33953-2017, the corrosion resistance requirement is met, and the HRB400cE chloride ion corrosion-resistant high-strength aseismic steel bars are successfully developed.
In addition, the steel sample of the embodiment is compared with the steel sample without vanadium (the other alloy elements are the same), and as a result is shown in fig. 4, it can be seen that the corrosion resistance of the steel sample and the corrosion resistance of the steel sample are not greatly different in a short time (within 72 h); however, for a long time (after 144 h), the corrosion rate of the steel sample of this example has been gradually reduced and started to be significantly lower than the steel sample without vanadium. It can be seen that the corrosion rate can be significantly reduced by the inclusion of 0.029% V.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. The production method of the steel bar is characterized by comprising the following steps:
(1) smelting in a converter: adding molten iron and scrap steel, calculating the proportion of each element, adding alloy, and smelting;
the percentage of each element is less than or equal to 0.65 percent, 0.25 to 7.00 percent of Cr, 0.028 to 0.029 percent of V, 1.3 percent of Mn and 1.92 percent of Ni/Cr;
(2) refining in an LF furnace: adding submerged arc slag and fluorite after molten steel enters a station, electrifying for 1-2min, adding 2/3 of the total amount of lime, adding the rest lime, carbon powder, a ladle modifier, refined synthetic slag and calcium carbide after the slagging materials are completely melted, then electrifying for refining, and blowing argon; adjusting the alkalinity of the slag to 2.5-3.0, maintaining the reducing atmosphere and good fluidity of the slag, ensuring that (FeO + MnO) in the slag is less than 1.0 percent, FeO is less than O.5 percent, and the color of the slag is white; adding alloy according to the condition when the molten steel is out of the station, and finely adjusting the molten steel components according to the proportion of the elements; the refining time is ensured to be more than 35 minutes;
the addition amount of each slagging material is as follows:
submerged arc slag: 2.6-2.8 kg/ton molten steel;
fluorite: 0.3-0.5 kg/ton molten steel;
lime: 6-7 kg/ton molten steel;
a steel ladle modifier: 0.5 kg/ton molten steel;
refining synthetic slag: 1-2 kg/ton molten steel;
calcium carbide: 0.3-0.5 kg/ton molten steel;
carbon powder: 10-30 kg;
the alkalinity R of the slag refers to the ratio of basic oxides to acidic oxides, and the calculation formula is as follows:
R＝(CaO+MgO)/(SiO2+Al2O3)；
(3) continuous casting: carrying out electromagnetic stirring and continuous casting to obtain a billet;
the electromagnetic stirring is carried out, the current is 300A, and the frequency is 5 Hz;
the continuous casting is characterized in that the drawing parameters are controlled as follows:
In the continuous casting, parameters of a water distribution link are controlled as shown in the following table:
(4) Rolling: and rolling to obtain the steel bar.
2. The production method according to claim 1, characterized in that: the percentage of each element in the step (1) is more than or equal to 0.16 percent and less than or equal to 0.21 percent of C, less than or equal to 0.80 percent of Si, less than or equal to 0.03 percent of P and less than or equal to 0.03 percent of S.
3. The production method according to claim 1, characterized in that: the alloy in the steps (1) and (2) comprises silicon-manganese alloy, silicon-iron alloy, vanadium-nitrogen alloy, high-carbon ferrochrome, ferronickel, silicon-aluminum-barium and silicon-calcium-barium.
4. The production method according to claim 1, characterized in that: and (4) performing electromagnetic stirring in the step (3), wherein the current is 300A, and the frequency is 5 Hz.
5. The production method according to claim 1, characterized in that: the rolling in the step (4) is specifically as follows:
heating temperature: the rod material is 1070-1084 ℃ and the disc snail is 1080-1087 ℃;
the temperature of a cooling bed on the bar is 900-935 ℃, and the spinning temperature of the spiral is 900-935 ℃;
rolling speed: the rod is 12.2-15.5 m/s, and the spiral is 45 m/s.
6. A reinforcing bar, characterized in that: is prepared by the method of any one of claims 1 to 5.
7. Use of a steel reinforcement according to claim 6 in an engineering application requiring resistance to earthquakes and/or chloride-ion corrosion.
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