CN111945074A - 635 MPa-grade high-strength anti-seismic reinforcing steel bar and preparation method thereof - Google Patents
635 MPa-grade high-strength anti-seismic reinforcing steel bar and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
The invention belongs to the technical field of hot-rolled ribbed steel bars for reinforced concrete structures, and particularly relates to a 635 MPa-grade high-strength anti-seismic steel bar and a preparation method thereof. The steel in the steel bar comprises the following chemical components in parts by weight: 0.24 to 0.29 percent of C, 0.70 to 0.80 percent of Si, 1.50 to 1.60 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, 0.100 to 0.160 percent of V, 0.010 to 0.0.030 percent of Nb, and the balance of Fe and inevitable impurity elements. The invention adopts the high C, Si and Mn component design and V, Nb combined microalloying mode under the existing process equipment condition of a production plant, combines the steel-making and steel-rolling processes to produce the 635 MPa-grade high-strength anti-seismic reinforcing steel bar with high strength and high plasticity, has stable performance and better comprehensive mechanical property, has the yield strength of more than or equal to 635MPa, the tensile strength of more than or equal to 795MPa, the elongation after fracture of more than or equal to 15 percent, the total elongation under the maximum force of more than or equal to 9.0 percent, the strength-to-yield ratio of more than or equal to 1.25 and the yield-to-yield ratio of less than or equal to 1.30, has good anti-seismic performance, and meets the.
Description
Technical Field
The invention belongs to the technical field of hot-rolled ribbed steel bars for reinforced concrete structures, and particularly relates to a 635 MPa-grade high-strength anti-seismic steel bar and a preparation method thereof.
Background
The hot-rolled ribbed steel bar is widely applied to various reinforced concrete structures, and plays an important role in ensuring the service life and the use safety of reinforced concrete buildings. With the continuous emergence of high-rise and large-span buildings in China, the demand for high-strength steel bars, particularly 635 MPa-level steel bars, is increased. The 635 MPa-grade reinforcing steel bar is adopted to replace a 400 MPa-grade and grade HRB400 reinforcing steel bar, so that the material can be saved by about 35 percent or more. Most provinces and cities in China are in earthquake zone areas, and with frequent occurrence of earthquakes in recent years, the demand for earthquake-resistant reinforcing steel bars is continuously increased. Therefore, the use of the 635MPa grade high-strength anti-seismic reinforcing steel bar not only accords with the national policy of green and environment-friendly construction and sustainable development in China, but also has important significance for the technical progress of the construction industry and the metallurgical industry.
In recent years, 400 MPa-grade, HRB400 and HRB400E (E represents aseismic steel bar) steel bars are commonly used in China, 500 MPa-grade steel bars are widely applied, and hot-rolled ribbed steel bars with higher strength grade are also in research, development and application. The patent document of Chinese patent application No. 201310593620.6 discloses 'a reinforced bar with high strength above 630MPa and a reinforced concrete application method thereof', the components of the reinforced bar are as follows: 0.28 to 0.38 percent of carbon, 0 to 0.35 percent of silicon, 0 to 0.90 percent of manganese, 0.80 to 1.50 percent of chromium, 3.00 to 4.00 percent of nickel, 0.40 to 0.60 percent of molybdenum, 0 to 0.015 percent of phosphorus, 0 to 0.015 percent of sulfur, 0 to 2.0ppm of hydrogen, 0.10 to 0.20 percent of vanadium, 0 to 0.025 percent of titanium, 0 to 0.20 percent of copper, 0 to 0.05 percent of aluminum, 0 to 0.50 percent of residual elements and the balance of Fe. Taking chromium-nickel-molybdenum alloy structural steel as a blank, and carrying out hydrogen diffusion heat treatment on the blank to obtain the 630 MPa-grade high-strength steel bar. However, it has the following disadvantages: (1) the chromium-nickel-molybdenum alloy structural steel is high in price and not beneficial to large-scale popularization and application; (2) no application of seismic structures is considered.
The three anti-seismic indexes of the anti-seismic steel bar applied to the anti-seismic structure, namely the strength-to-yield ratio (tensile strength/yield strength), the yield-to-yield ratio and the elongation at maximum force, are far higher than those of the common steel bar, particularly the strength-to-yield ratio, and the reduction range is larger along with the increase of the yield strength, so that the high strength-to-yield ratio is the largest technical problem to be solved by the 635MPa high-strength anti-seismic steel bar.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art, and the preparation method of the 635 MPa-grade high-strength anti-seismic steel bar is provided by combining the chemical component design and the corresponding steel-making and steel-rolling processes, saves the chromium-nickel-molybdenum alloy resource, and is suitable for industrial batch production;
the invention aims to solve another technical problem and provide a 635 MPa-grade high-strength anti-seismic steel bar for overcoming the defects in the prior art, wherein the yield strength of the high-strength anti-seismic steel bar is more than or equal to 635MPa, the tensile strength of the high-strength anti-seismic steel bar is more than or equal to 795MPa, the elongation after fracture is more than or equal to 15%, the total elongation under maximum force is more than or equal to 9.0%, the yield ratio of the high-strength anti-seismic steel bar is more than or equal to 1.25, and. .
In order to solve the technical problem, the technical scheme is that the preparation method of the 635 MPa-grade high-strength anti-seismic steel bar comprises the following steps:
s1, smelting the steelmaking raw materials into crude molten steel, wherein the weight contents of P and S in the crude molten steel at the smelting end point are both less than or equal to 0.025 percent, the tapping temperature is 1660-;
s2, enabling the ladle to enter a refining furnace, starting bottom blowing inert gas, starting an electrode to heat, adding a slag making material to make white slag, sampling and checking and carrying out component fine adjustment after the set heating time and temperature are reached so as to enable the white slag to meet the component requirement of the steel bars, and enabling the ladle to be taken out of a refining furnace station at the temperature of 1550-;
s3, hoisting the steel ladle to a continuous casting platform, casting the steel ladle into a steel billet, wherein in the casting process, the steel ladle, the tundish and the crystallizer are all subjected to whole-process protection casting, the temperature of tundish molten steel is 1520-.
The preparation method of the 635 MPa-grade high-strength anti-seismic reinforcing steel bar is further improved as follows:
preferably, the device for smelting the steelmaking raw materials into the molten raw steel in the step S1 is an electric furnace or a converter.
Preferably, the refining furnace in step S2 is an LF furnace, or a combination of an LF furnace and any one of an RH furnace, a VOD furnace, and a VD furnace.
Preferably, in step S3, the steel billet comprises the following chemical components in parts by weight: 0.24 to 0.29 percent of C, 0.70 to 0.80 percent of Si, 1.50 to 1.60 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, 0.100 to 0.160 percent of V, 0.010 to 0.030 percent of Nb, and the balance of Fe and inevitable impurity elements.
Preferably, the chemical composition of the steel billet in the step S3 includes, by weight: 0.26% of C, 0.75% of Si, 1.55% of Mn, 0.025% of P, 0.020% of S, 0.130% of V, 0.015% of Nb and the balance of Fe and inevitable impurity elements.
Preferably, the specific steps of deoxidizing and alloying in step S1 are: the specific steps for deoxidation and alloying in step S1 are: and (3) beginning to add the compound deoxidizer, the silicon-manganese alloy, the silicon-iron alloy, the ferroniobium alloy and the vanadium-nitrogen alloy when the steel tapping amount is 1/4, finishing adding when the steel tapping amount is 3/4, and enabling the addition amount to meet the requirements of chemical components of the steel billet.
Preferably, the specific operation of opening the ladle to blow the inert gas at the bottom in step S1 is as follows: and starting bottom blowing inert gas, wherein the flow rate is that the liquid level of the steel slag is blown open but the steel slag cannot be vigorously overturned, then adjusting the flow rate of the inert gas to 80-90% of the initial flow rate, starting an electrode to heat and raise the temperature, adding a slagging material to make white slag and finely adjusting the components, adjusting the flow rate of the inert gas to 50% of the initial flow rate, continuously blowing for 10-15min, and then tapping the steel ladle out of the refining furnace.
Preferably, the cross-section of the billet in the step S3 is 150 × 150mm2。
In order to solve another technical problem, the technical scheme is that the 635 MPa-grade high-strength anti-seismic reinforcing steel bar is prepared by any one of the preparation methods.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a method for producing a 635 MPa-grade high-strength steel bar with high strength and high plasticity by combining a high-C, Si and Mn component design and V, Nb combined micro-alloying mode with a steel-making and steel-rolling process, wherein the prepared steel bar has stable performance and better comprehensive mechanical property, the yield strength is more than or equal to 635MPa, the tensile strength is more than or equal to 795MPa, the elongation after fracture is more than or equal to 15%, the total elongation at maximum force is more than or equal to 9.0%, the strength-to-yield ratio is more than or equal to 1.25, and the yield-to-yield ratio is less than or equal to 1.30.
2. The design of the chemical components of the 635MPa grade high-strength anti-seismic steel bar is based on the following consideration: c contributes most to the strength of the steel and is inexpensive. C can be dissolved in steel to form an interstitial solid solution, plays a role in solid solution strengthening, and can also form carbide precipitation with strong carbide forming elements such as V, Nb, Ti and the like, and plays a role in precipitation strengthening; however, the increase of the C content remarkably deteriorates the plasticity and toughness of the steel, and in view of the above, the C content is 0.24 to 0.29% in the present invention.
Si does not form carbide in steel, is basically present in solid solution in steel, and has a remarkable solid solution strengthening effect. In common metal elements, the solid solution strengthening effect of Si is strongest, but the decarburization tendency of steel is obviously increased by excessively high Si content, so that the performance of the steel is uneven, and the Si content is designed to be 0.70-0.80%.
Mn can improve hardenability of steel, can be dissolved in ferrite to perform a solid solution strengthening effect, and can refine pearlite grains, thereby remarkably improving strength of steel. But when the Mn content exceeds 1.60%, the plasticity and toughness of the steel can be obviously reduced, and the Mn content is designed to be 1.50-1.60%;
p, S is generally considered as a harmful element, P has a cold brittleness tendency, S has a hot brittleness tendency, the toughness of steel can be reduced, on one hand, P, S removal inevitably increases the slag amount, not only increases the production difficulty, but also may have adverse effects on the casting blank quality because the following slag amount cannot be well controlled; on the other hand, for hot rolled ribbed steel bars, for example, HRB500 grade of 500MPa, P, S is less than or equal to 0.045%, and the requirement of the extension performance of the steel bars can be met. Considering that the 635MPa grade strength is higher, the design P, S is less than or equal to 0.035%;
v is a strong carbonitride forming element and has strong bonding force with C, N, and the formed fine and dispersedly distributed V (C, N) second phase particles can play a strong precipitation strengthening effect, can refine crystal grains and further improve the strength of steel, but V is a precious metal, and the addition amount of V is reduced on the premise of meeting the performance requirement, and the content range of V is designed to be 0.100-0.160%.
Nb can be dissolved in steel at high temperature, solid-dissolved Nb atoms can inhibit the growth of high-temperature austenite grains through the dragging effect of grain boundary movement, the fine grain strengthening effect is achieved, meanwhile, the solid-dissolved Nb atoms at high temperature can also achieve the solid-solution strengthening effect, the improvement of the yield ratio index is facilitated, the effect of Nb in a steel bar is weakened when the Nb exceeds 0.040%, and the Nb content range is designed to be 0.010-0.030%.
In conclusion, the invention adopts the component design of high C, high Si and high Mn, fully utilizes the solid solution strengthening effect of C, Si and Mn, and improves and stabilizes the yield ratio; in three main strengthening modes of solid solution, precipitation and fine grains of the hot rolled steel bar, the range of improving the tensile strength is larger than the range of improving the yield strength only by solid solution strengthening, so that the yield ratio is ensured; the V, Nb composite microalloying component design is adopted, and the strength of the steel bar is improved by utilizing the fine dispersion precipitation strengthening of V (C, N) particles and the fine crystal strengthening effect of Nb, and meanwhile, the plasticity of the steel bar is kept; the solid solution strengthening effect of Nb in the high temperature area is utilized to ensure the yield ratio.
3. The design of the steel rolling process of the 635MPa grade high-strength anti-seismic steel bar steel is based on the following consideration: refining by adopting an LF furnace or the combination of the LF furnace and other furnaces, strictly controlling the content of molten steel P, S and oxides and other impurities, and improving the plasticity index of the steel bar; during rolling, the heating temperature is controlled to promote the dissolution of C, Si and Mn elements in steel, exert the solid solution strengthening effect, control the finish rolling temperature, exert the solid solution strengthening effect of Nb, control the temperature of an upper cooling bed, and exert the precipitation strengthening and fine grain strengthening effects of V (C, N) and Nb (C, N) particles. The smelting process is the same as that of the common HRB400 steel bar, most domestic production plants have conditions, and no additional equipment or operation method is needed. The niobium-containing steel has the defects of plasticity underestimation temperature area, easy occurrence of cracks and the like in the continuous casting process. In order to solve the crack defect of the casting blank, a method of avoiding an underestimation temperature area for straightening is adopted in the continuous casting process, and the temperature of the casting blank is controlled to be more than or equal to 950 ℃ for straightening. The heating temperature is controlled to 1150 +/-20 ℃, Si, Mn and V can be basically and completely dissolved in the steel at 950 ℃, V and C, N in the steel form V (C, N) particles, and the functions of precipitation and fine grain strengthening are exerted; the dissolving temperature of Nb is higher, and the total dissolving temperature is about 1200 ℃, but crystal grains can be coarsened at high temperature, so that the toughness of the steel is reduced; most Nb can be dissolved at 1150 +/-20 ℃, crystal grains are not coarsened basically, so that the strength and toughness performance and the yield ratio performance of the steel are ensured, the temperature of an upper cooling bed is controlled to be 900-950 ℃, and the precipitation of fine and dispersed V (C, N) particles is promoted, so that the strength and toughness performance of the steel is ensured.
Drawings
FIG. 1 is a SEM photograph of a steel bar sample prepared in example 1 of the present invention;
FIG. 2 is a second phase particle energy spectrum of a steel bar sample prepared in example 1 of the present invention.
FIG. 3 is a metallographic structure of a steel bar sample prepared in example 1 of the present invention, with a scale of 100nm, in which: the black structure is pearlite, the white structure is ferrite, and the grain size of the ferrite is 9.0 grade;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the protection scope of the present invention.
Example 1
The embodiment provides a 635 MPa-grade high-strength anti-seismic steel bar and a preparation method thereof, and the preparation method comprises the following steps:
the steel comprises the following chemical components in parts by weight: 0.24% of C, 0.70% of Si, 1.50% of Mn, 0.020% of P, 0.013% of S, 0.160% of V, 0.010% of Nb and the balance of Fe and inevitable impurity elements;
a converter process: finishing points of 0.018% P and 0.011% S, and tapping temperature of 1660 ℃, and adding the alloy into a ladle in the tapping process;
an LF furnace process: refining and removing P, S from the manufactured white slag, blowing argon for 15min before the white slag is discharged, and discharging at 1550 ℃;
and (3) continuous casting process: the whole process is protected and poured, the tundish temperature is 1520 ℃, the straightening temperature is 950 ℃, and the working pulling speed is 2.8 m/min;
a steel rolling procedure: heating temperature to 1130 ℃, finishing temperature to 1050 ℃, rolling into a steel bar with phi 12mm by rough rolling, intermediate rolling and finishing rolling, and controlling cooling after rolling to reach the temperature of 950 ℃ on a cooling bed to obtain a steel bar sample 1.
The steel bar sample 1 prepared in the example 1 is subjected to a projection electron microscope scanning, and the scanning photo is shown in figure 1; the reinforcing steel bar sample 1 prepared in example 1 was subjected to a second phase particle spectrum test, and the test pattern is shown in fig. 2. As can be seen from the pictures, a large amount of V, Nb (C, N) second phase particles which are approximately round and have the size of about 10nm are finely dispersed and separated out on the steel bar, the Nb content in the precipitates is relatively low, mainly comprises V, and the toughness of the steel bar can be obviously improved;
FIG. 3 is prepared as in example 1
The metallographic structure of the steel bar sample 1 of the specification is shown in fig. 2, and the grain size of the steel bar is grade 10, and the structure of the steel bar is ferrite and pearlite.
Example 2
The embodiment provides a 635 MPa-grade high-strength anti-seismic steel bar and a preparation method thereof, and the preparation method comprises the following steps:
the steel comprises the following chemical components in parts by weight: 0.29% of C, 0.80% of Si, 1.60% of Mn, 0.024% of P, 0.013% of S, 0.100% of V, 0.030% of Nb, and the balance of Fe and inevitable impurity elements;
a converter process: finishing points of 0.020% P and 0.012% S, tapping temperature of 1710 ℃, and adding the alloy into a steel ladle in the tapping process;
an LF furnace process: refining and removing P, S for white slag, blowing argon for 10min before leaving the station in a weak way, and leaving the station at the temperature of 1620 ℃;
and (3) continuous casting process: the whole process is protected and poured, the tundish temperature is 1560 ℃, the straightening temperature is 1000 ℃, and the working pulling speed is 2.0 m/min;
a steel rolling procedure: heating temperature 1170 ℃, finishing temperature 1100 ℃, rough rolling, intermediate rolling and finishing rolling to obtain a steel bar with phi 16mm, and cooling by controlling after rolling, wherein the temperature of the steel bar on a cooling bed is 900 ℃, thus obtaining a steel bar sample 1.
Example 3
The embodiment provides a 635 MPa-grade high-strength anti-seismic steel bar and a preparation method thereof, and the preparation method comprises the following steps:
the steel comprises the following chemical components in parts by weight: 0.26% of C, 0.72% of Si, 1.52% of Mn, 0.022% of P, 0.015% of S, 0.140% of V, 0.015% of Nb and the balance of Fe and inevitable impurity elements;
a converter process: the final points are 0.019% of P and 0.013% of S, the tapping temperature is 1670 ℃, and the alloy is added into a steel ladle in the tapping process;
an LF furnace process: refining white slag to remove P, S, blowing argon for 14min before leaving the station, and leaving the station at 1560 ℃;
and (3) continuous casting process: the whole process is protected and poured, wherein the tundish temperature is 1530 ℃, the straightening temperature is 960 ℃, and the working casting speed is 2.6 m/min;
a steel rolling procedure: heating temperature is 1140 ℃, finishing temperature is 1060 ℃, steel bar with phi of 20mm is rolled through rough rolling, intermediate rolling and finishing rolling, and steel bar sample 1 is prepared through controlled cooling after rolling and temperature of 960 ℃ on a cooling bed.
Example 4
The embodiment provides a 635 MPa-grade high-strength anti-seismic steel bar and a preparation method thereof, and the preparation method comprises the following steps:
the steel comprises the following chemical components in parts by weight: 0.28% of C, 0.78% of Si, 1.58% of Mn, 0.025% of P, 0.014% of S, 0.140% of V, 0.025% of Nb and the balance of Fe and inevitable impurity elements;
a converter process: finishing points of 0.022% P and 0.011% S, and tapping temperature of 1700 ℃, and adding the alloy into a steel ladle in the tapping process;
an LF furnace process: refining and removing P, S for white slag, blowing argon for 12min before leaving the station, and leaving the station at the temperature of 1610 ℃;
and (3) continuous casting process: the whole process is protected and poured, the tundish temperature is 1550 ℃, the straightening temperature is 990 ℃, and the working pulling speed is 2.2 m/min;
a steel rolling procedure: heating temperature is 1160 ℃, and final rolling temperature is 1090 ℃, steel bars with the diameter of 25mm are rolled through rough rolling, intermediate rolling and final rolling, and steel bar samples 1 are prepared through controlled cooling after rolling and the temperature of a cooling bed is 940 ℃.
TABLE 1 mechanical Properties of reinforcing bar samples prepared in examples 1-4 of the present invention
Wherein: reLIs the yield strength; rmIs tensile strength; high yield ratio (R)m o/ReL o)，Rm oFor measured tensile strength, ReL oMeasured yield strength; yield ratio (R)eL o635) is the yield strength characteristic value of the steel bar with the 635MPa level, and the unit is MPa; a is elongation after fracture; a. thegtElongation at maximum force.
From the mechanical properties of the samples prepared in the examples 1 to 4 in the table 1, the mechanical property technical requirements of 635MPa grade high-strength anti-seismic steel bars can be met by designing V, Nb composite microalloying components and optimally designing the process parameters of steel making, refining, continuous casting and steel rolling processes.
It should be understood by those skilled in the art that the foregoing is only illustrative of several embodiments of the invention, and not of all embodiments. It should be noted that many variations and modifications are possible to those skilled in the art, and all variations and modifications that do not depart from the gist of the invention are intended to be within the scope of the invention as defined in the appended claims.
Claims (9)
1. The preparation method of the 635 MPa-grade high-strength anti-seismic steel bar is characterized by comprising the following steps of:
s1, smelting the steelmaking raw materials into crude molten steel, wherein the weight contents of P and S in the crude molten steel at the smelting end point are both less than or equal to 0.025 percent, the tapping temperature is 1660-;
s2, enabling the ladle to enter a refining furnace, starting bottom blowing inert gas, starting an electrode to heat and raise the temperature, adding a slag making material to make white slag, sampling and checking and carrying out component fine adjustment after the set heating time and temperature are reached so as to enable the white slag to meet the component requirement of the steel bar, and enabling the ladle to exit from a refining station at 1550-;
s3, hoisting the steel ladle to a continuous casting platform, casting the steel ladle into a steel billet, wherein in the casting process, the steel ladle, the tundish and the crystallizer are all subjected to whole-process protection casting, the temperature of tundish molten steel is 1520-.
2. The method for preparing the 635 MPa-grade high-strength anti-seismic steel bar according to claim 1, wherein the equipment for smelting the steelmaking raw materials into the molten crude steel in the step S1 is an electric furnace or a converter.
3. The method for preparing 635MPa grade high-strength anti-seismic steel bar according to claim 1, wherein the refining furnace in step S2 is an LF furnace, or a combination of the LF furnace and any one of an RH furnace, a VOD furnace and a VD furnace.
4. The method for preparing the 635 MPa-grade high-strength anti-seismic steel bar according to claim 1, wherein the steel billet in the step S3 comprises the following chemical components in parts by weight: 0.24 to 0.29 percent of C, 0.70 to 0.80 percent of Si, 1.50 to 1.60 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, 0.100 to 0.160 percent of V, 0.010 to 0.030 percent of Nb, and the balance of Fe and inevitable impurity elements.
5. The method for preparing the 635MPa grade high-strength anti-seismic steel bar according to claim 1 or 4, wherein the chemical components of the steel billet in the step S3 comprise, by weight: 0.26% of C, 0.75% of Si, 1.55% of Mn, 0.025% of P, 0.020% of S, 0.130% of V, 0.015% of Nb and the balance of Fe and inevitable impurity elements.
6. The method for preparing the 635 MPa-grade high-strength anti-seismic steel bar according to claim 4, wherein the specific steps of deoxidizing and alloying in the step S1 are as follows: and (3) beginning to add the compound deoxidizer, the silicon-manganese alloy, the silicon-iron alloy, the ferroniobium alloy and the vanadium-nitrogen alloy when the steel tapping amount is 1/4, finishing adding when the steel tapping amount is 3/4, and enabling the addition amount to meet the requirements of chemical components of the steel billet.
7. The method for preparing the 635 MPa-grade high-strength anti-seismic steel bar according to claim 1, wherein the specific operations of opening the bottom blowing of inert gas by the ladle in the step S1 are as follows: and starting bottom blowing inert gas, wherein the flow rate is that the liquid level of the steel slag is blown open but the steel slag cannot be vigorously overturned, then adjusting the flow rate of the inert gas to 80-90% of the initial flow rate, starting an electrode to heat and raise the temperature, adding a slagging material to make white slag and finely adjusting the components, adjusting the flow rate of the inert gas to 50% of the initial flow rate, continuously blowing for 10-15min, and then tapping the steel ladle out of the refining furnace.
8. The method for preparing 635 MPa-grade high-strength anti-seismic steel bar according to claim 1, wherein the section of the billet in the step S3 is 150 x 150mm2。
9. A635 MPa grade high strength aseismic reinforcement bar produced by the method of any one of claims 1-8.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113462966A (en) * | 2021-06-18 | 2021-10-01 | 马鞍山钢铁股份有限公司 | Economical 630MPa high-strength anti-seismic steel bar steel and production method thereof |
| CN113528938A (en) * | 2021-06-10 | 2021-10-22 | 广西柳钢华创科技研发有限公司 | HRB600E normal speed hot rolled ribbed steel bar with yield ratio more than 1.26 and production method thereof |
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| CN115198197A (en) * | 2022-08-22 | 2022-10-18 | 安徽吾兴新材料有限公司 | 640 MPa-grade high-strength anti-seismic reinforcing steel bar and preparation method thereof |
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| CN116657058A (en) * | 2023-06-02 | 2023-08-29 | 安徽吾兴新材料有限公司 | High-strength steel bar with excellent corrosion resistance and earthquake resistance and preparation method thereof |
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| CN115198197A (en) * | 2022-08-22 | 2022-10-18 | 安徽吾兴新材料有限公司 | 640 MPa-grade high-strength anti-seismic reinforcing steel bar and preparation method thereof |
| CN115852248A (en) * | 2022-09-28 | 2023-03-28 | 马鞍山钢铁股份有限公司 | V-Nb composite microalloyed 650 MPa-level anti-seismic steel bar and production method thereof |
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| CN117574523A (en) * | 2024-01-16 | 2024-02-20 | 安徽吾兴新材料有限公司 | Concrete cylindrical member minimum hooping rate calculation method based on high-strength spiral hooping |
| CN117574523B (en) * | 2024-01-16 | 2024-03-26 | 安徽吾兴新材料有限公司 | Concrete cylindrical member minimum hooping rate calculation method based on high-strength spiral hooping |
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