CN115305416B - Reinforcing steel bar and preparation method thereof - Google Patents
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
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C21C7/072—Treatment with gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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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
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention provides a steel bar and a preparation method thereof, relating to the preparation of steel, wherein the steel bar comprises the following components in percentage by weight: 0.09-0.13% of C, 0.15-0.25% of Si, 1-2% of Mn, 0.01-0.03% of P, 0.3-0.4% of CrO, 0.2-0.3% of Cu, 0.02-0.05% of V, 0.01-0.04% of Ti, 0.35-0.45% of Ce, 0.16-0.28% of Ni, 0.02-0.03% of Al and the balance of iron and unavoidable impurities. The finally prepared steel bar has the characteristics of low carbon and low vanadium, and can keep good mechanical property and corrosion resistance while saving cost.
Description
Technical Field
The invention relates to preparation of steel, in particular to a steel bar and a preparation method thereof.
Background
Corrosion generally refers to the formation of unstable corrosion products Fe on the surface of steel bars due to carbonization of concrete or invasion of chloride ions 2 O 3 ·nH 2 And O, generating corrosion phenomenon that the volume expansion causes the damage of the reinforced concrete. Conditions under which rust occurs include: (1) the surface of the steel bar has potential difference; (2) the surface of the anode section steel bar is in an activated state; and (3) the presence of oxygen and water.
The steel bars are widely applied to the concrete infrastructure framework at present, and related researches show that the concrete steel bars can be cracked only by the thickness of a thinner rust layer, so that the whole engineering construction is influenced. Such as literature: yang Xingxing, shouzhen, study on mechanical properties of rusted steel bars in long-term construction stop engineering [ J ]. Low-temperature construction technique 2022,44 (5): 5. The study shows that: the yield strength and the ultimate tensile strength of the rusted steel bar are approximately linearly reduced along with the increase of the rusting rate, and the binding force between the rusted steel bar and the concrete is reduced when the rusting rate is more than 3 percent. Therefore, the corrosion of the steel bars has obvious relevance to the strength of the steel bars, and meanwhile, the corrosion of the steel bars also affects the key main concrete of the engineering construction, thereby bringing about the problem of safety.
Literature: zhao Wenjuan concrete carbonization induced reinforcement corrosion test study [ J ]. Shanxi construction, 2010,36 (16): 2. Concrete carbonization was also analyzed for its effect on reinforcement, and precautions to be taken against reinforcement corrosion were also provided, but mainly against concrete itself, such as lowering the concrete water-cement ratio and using a coating, etc. The production of corrosion resistant steel bars is also a relatively efficient way for the bars themselves, and the types of corrosion resistant steel bars typically include corrosion resistant low alloy bars, copper clad bars, galvanized bars, epoxy coated bars, polyvinyl butyral coated bars, and stainless steel bars, among others. Related researches such as patent CN113735539A disclose a steel bar rust-resistant coating material, a preparation method thereof and a steel bar rust-resistant method, wherein the related rust-resistant method is to prepare the steel bar rust-resistant coating material by using slag silicate cement, aqueous epoxy resin, emulsion interface treating agent, steel bar rust inhibitor and defoamer, so that the rust-resistant coating can obtain excellent rust-resistant and corrosion-resistant performances, improve the bond strength between the steel bar and concrete, solve the problems of corrosion and expansion crack of the steel bar caused by corrosion of chloride ions in the service process of the reinforced concrete in a saline-alkali environment, obviously improve the corrosion resistance of the steel bar in the reinforced concrete, prevent the concrete from swelling and expanding due to corrosion of the steel bar, prolong the service life of buildings in a saline-alkali environment and reduce the later maintenance cost. However, when the rust-resistant coating of the steel bar is damaged in the transportation and loading and unloading processes, the rust resistance of the steel bar is obviously reduced.
Also as disclosed in patent CN108193124B, a high-strength atmospheric corrosion resistant steel bar and a preparation method thereof are disclosed, the preparation method comprising the steps of: pretreating sea sand, copper slag and coal dust, and uniformly mixing; adding a slaked lime flux and a syrup additive to the raw material mixture; ball pressing and drying are carried out on the material to be reduced to obtain pellets; reducing and post-treating the pellets to obtain vanadium-titanium-copper-iron alloy; and smelting molten steel by a converter or an electric furnace, adding the vanadium-titanium-copper-iron alloy and ferrophosphorus in the molten steel tapping process, and refining, continuous casting and hot rolling to obtain the high-strength atmospheric corrosion resistant steel bar. However, the carbon content in the steel bar is relatively high, and the pretreatment process of raw materials is also complex.
Therefore, the method has very important significance in the aspects of guaranteeing engineering safety and saving resources, and is capable of facing the problem of corrosion of the steel bars, improving the corrosion resistance of the steel bars and prolonging the service life of the steel bars.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides the steel bar and the preparation method thereof, and the prepared steel bar has low carbon and low vanadium, so that the cost is saved, and meanwhile, the steel bar can keep good mechanical property and corrosion resistance.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides a steel bar, which comprises the following components in percentage by weight: 0.09-0.13% of C, 0.15-0.25% of Si, 1-2% of Mn, 0.01-0.03% of P, 0.3-0.4% of CrO, 0.2-0.3% of Cu, 0.02-0.05% of V, 0.01-0.04% of Ti, 0.35-0.45% of Ce, 0.16-0.28% of Ni, 0.02-0.03% of Al and the balance of iron and unavoidable impurities.
Further, the steel bar comprises the following components in percentage by weight: 0.09-0.12% of C, 0.15-0.2% of Si, 1-1.6% of Mn, 0.01-0.03% of P, 0.3-0.35% of CrO, 0.26-0.3% of Cu, 0.02-0.03% of V, 0.01-0.03% of Ti, 0.35-0.4% of Ce, 0.18-0.25% of Ni, 0.02-0.03% of Al and the balance of iron and unavoidable impurities.
Preferably, the steel bar comprises the following components in percentage by weight: 0.1% of C, 0.18% of Si, 1.2% of Mn, 0.02% of P, 0.3% of CrO, 0.28% of Cu, 0.02% of V, 0.02% of Ti, 0.36% of Ce, 0.2% of Ni, 0.03% of Al, and the balance of iron and unavoidable impurities.
Further, the weight ratio of V, ti, ce, ni to Al is 0.2-0.5:0.1-0.4:3-4:1-3:0.2-0.3. Preferably 0.2:0.2:3.6:2:0.2.
Further, the preparation method of the steel bar provided by the invention comprises the following steps:
(1) Smelting and refining: refining raw materials with the formula dosage to obtain crude molten steel;
(2) Refining: placing the crude steelmaking water obtained in the step (1) in a refining furnace, and blowing argon at the bottom of the furnace to obtain refined molten steel;
(3) Continuous casting: controlling casting temperature and drawing speed, and continuously casting to obtain a steel billet;
(4) Heating and rolling: heating the steel billet gradually, discharging the steel billet from the furnace, removing scales by water, rolling, rough rolling, intermediate rolling, pre-finish rolling and finish rolling, and cooling to obtain the steel bar.
Further, the temperature of the refining in step (1) is 1650-1680 ℃.
Further, the control temperature of the refining furnace in the step (2) is 1700-1750 ℃.
Further, the continuous casting in the step (3) is performed in a step heating furnace, the casting temperature is 1520-1550 ℃, and the pulling speed is 2.3-2.5m/min.
Further, the step (4) of gradually increasing the temperature specifically includes: the first heating to 600 deg.C, the second heating to 850-900 deg.C, the third heating to 950-980 deg.C, and the fourth heating to 1000-1150 deg.C. The total duration of four heats is between 350 and 400 min.
Further, the temperature of the rough rolling is 1080-1100 ℃, the temperature of the medium rolling is 980-1000 ℃, the temperature of the pre-finish rolling is 900-930 ℃, and the temperature of the finish rolling is 800-850 ℃.
Further, the cooling in the step (4) may be a surface mist cooling process, a cooling bed cooling process or the like.
The invention has the technical effects that:
1. according to the invention, the raw material proportion of the components of the steel bar is regulated, V, ti, ce, ni and the addition and proportion of Al are reasonably controlled, so that grain refinement is promoted in the preparation process of the steel bar, and the strength and corrosion resistance of the steel bar are improved. Meanwhile, compared with the preparation formula of most reinforcing steel bars in the prior art, the raw material composition of the invention reduces the use of C and V, achieves the aim of low carbon, achieves the aim of saving cost in the large environment with increasingly high V price, and is beneficial to the industrialized development of the reinforcing steel bars.
2. According to the invention, the preparation process of the steel bar is optimized, the programmed heating is used in the heating and rolling processes, the temperature and the speed conditions of each step are precisely controlled in the whole process, and the finally obtained steel bar has excellent corrosion resistance and mechanical properties.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Before the embodiments of the invention are explained in further detail, it is to be understood that the invention is not limited in its scope to the particular embodiments described below; it is also to be understood that the terminology used in the examples of the invention is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the invention.
Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It should be noted that the raw materials used in the present invention are all common commercial products, and therefore the sources thereof are not particularly limited.
Example 1
A rebar comprising, in weight percent: 0.09% of C, 0.25% of Si, 1% of Mn, 0.01% of P, 0.4% of CrO, 0.2% of Cu, 0.02% of V, 0.04% of Ti, 0.35% of Ce, 0.16% of Ni, 0.02% of Al, and the balance of iron and unavoidable impurities.
The preparation method of the steel bar comprises the following steps:
(1) Smelting and refining: refining raw materials with the formula dosage at 1650 ℃ to obtain crude molten steel;
(2) Refining: placing the crude steelmaking water obtained in the step (1) in a refining furnace, controlling the temperature to 1700 ℃, and blowing argon at the bottom of the furnace to obtain refined molten steel;
(3) Continuous casting: controlling the casting temperature to 1520 ℃, and continuously casting to obtain a billet with the pulling speed of 2.3 m/min;
(4) Heating and rolling: and heating the steel billet, gradually heating, heating to 600 ℃ for the first time, heating to 850 ℃ for the second time, heating to 950 ℃ for the third time, and heating to 1000 ℃ for the fourth time. The total duration of four times of heating is 400min, the billet is rolled after being discharged and water is removed from the furnace, and the steel bar is obtained after being subjected to rough rolling at 1080 ℃, rolling at 980 ℃, pre-finish rolling at 900 ℃ and finish rolling at 800 ℃, and cooling by a cooling bed.
Example 2
A steel bar comprises, by weight, 0.13% of C, 0.15% of Si, 2% of Mn, 0.03% of P, 0.3% of CrO, 0.3% of Cu, 0.05% of V, 0.01% of Ti, 0.45% of Ce, 0.28% of Ni, 0.03% of Al, and the balance of iron and unavoidable impurities.
The preparation method of the steel bar comprises the following steps:
(1) Smelting and refining: refining raw materials with the formula dosage at 1680 ℃ to obtain crude molten steel;
(2) Refining: placing the crude steelmaking water obtained in the step (1) in a refining furnace, controlling the temperature to 1750 ℃, and blowing argon at the bottom of the furnace to obtain refined molten steel;
(3) Continuous casting: controlling the casting temperature to 1550 ℃, and continuously casting to obtain a billet, wherein the pulling speed is 2.5 m/min;
(4) Heating and rolling: and heating the steel billet gradually, heating to 600 ℃ for the first time, heating to 900 ℃ for the second time, heating to 980 ℃ for the third time, and heating to 1150 ℃ for the fourth time. The total duration of four times of heating is 350min, the billet is rolled after being discharged and water is removed from the furnace, and the steel bar is obtained after rough rolling at 1100 ℃, rolling at 1000 ℃, pre-finish rolling at 930 ℃ and finish rolling at 850 ℃, and cooling by a cooling bed.
Example 3
A rebar comprising, in weight percent: 0.1% of C, 0.18% of Si, 1.2% of Mn, 0.02% of P, 0.3% of CrO, 0.28% of Cu, 0.02% of V, 0.02% of Ti, 0.36% of Ce, 0.2% of Ni, 0.03% of Al, and the balance of iron and unavoidable impurities.
The preparation method of the steel bar comprises the following steps:
(1) Smelting and refining: refining raw materials with the formula dosage at 1660 ℃ to obtain crude molten steel;
(2) Refining: placing the crude steelmaking water obtained in the step (1) in a refining furnace, controlling the temperature to 1700 ℃, and blowing argon at the bottom of the furnace to obtain refined molten steel;
(3) Continuous casting: controlling the casting temperature to 1550 ℃, and continuously casting to obtain a billet, wherein the pulling speed is 2.4 m/min;
(4) Heating and rolling: and heating the steel billet gradually, heating to 600 ℃ for the first time, 880 ℃ for the second time, 960 ℃ for the third time, and 1100 ℃ for the fourth time. The total duration of four times of heating is 360min, the billet is rolled after being discharged from the furnace and water is descaled, and the steel bar is obtained after being subjected to rough rolling at 1100 ℃, rolling at 1000 ℃, pre-finish rolling at 920 ℃ and finish rolling at 820 ℃, and cooling by a cooling bed.
Comparative example 1
A rebar comprising, in weight percent: 0.15% of C, 0.1% of Si, 2.2% of Mn, 0.01% of P, 0.5% of CrO, 0.1% of Cu, 0.08% of V, 0.01% of Ti, 0.5% of Ce, 0.1% of Ni, 0.05% of Al, and the balance of iron and unavoidable impurities
The preparation method of the steel bar comprises the following steps:
(1) Smelting and refining: refining raw materials with the formula dosage at 1650 ℃ to obtain crude molten steel;
(2) Refining: placing the crude steelmaking water obtained in the step (1) in a refining furnace, controlling the temperature to 1700 ℃, and blowing argon at the bottom of the furnace to obtain refined molten steel;
(3) Continuous casting: controlling the casting temperature to 1520 ℃, and continuously casting to obtain a billet with the pulling speed of 2.3 m/min;
(4) Heating and rolling: and heating the steel billet, gradually heating, heating to 600 ℃ for the first time, heating to 850 ℃ for the second time, heating to 950 ℃ for the third time, and heating to 1000 ℃ for the fourth time. The total duration of four times of heating is 400min, the billet is rolled after being discharged and water is removed from the furnace, and the steel bar is obtained after being subjected to rough rolling at 1080 ℃, rolling at 980 ℃, pre-finish rolling at 900 ℃ and finish rolling at 800 ℃, and cooling by a cooling bed.
Comparative example 2
A rebar comprising, in weight percent: 0.09% of C, 0.25% of Si, 1% of Mn, 0.01% of P, 0.4% of CrO, 0.2% of Cu, 0.01% of V, 0.05% of Ti, 0.25% of Ce, 0.33% of Ni, 0.01% of Al, and the balance of iron and unavoidable impurities. That is, only the difference from example 1 is that the weight ratio of V, ti, ce, ni to Al was 0.1:0.5:2.5:3.3:0.1 (the total weight of the five raw materials was the same as in example 1), and the production method was the same as in example 1.
Comparative example 3
A rebar comprising, in weight percent: 0.09% of C, 0.25% of Si, 1% of Mn, 0.01% of P, 0.4% of CrO, 0.2% of Cu, 0.02% of V, 0.04% of Ti, 0.35% of LaO, 0.16% of Ni, 0.02% of Nb, and the balance of iron and unavoidable impurities.
The preparation method of the steel bar comprises the following steps:
(1) Smelting and refining: refining raw materials with the formula dosage at 1650 ℃ to obtain crude molten steel;
(2) Refining: placing the crude steelmaking water obtained in the step (1) in a refining furnace, controlling the temperature to 1700 ℃, and blowing argon at the bottom of the furnace to obtain refined molten steel;
(3) Continuous casting: controlling the casting temperature to 1520 ℃, and continuously casting to obtain a billet with the pulling speed of 2.3 m/min;
(4) Heating and rolling: and heating the steel billet, gradually heating, heating to 600 ℃ for the first time, heating to 850 ℃ for the second time, heating to 950 ℃ for the third time, and heating to 1000 ℃ for the fourth time. The total duration of four times of heating is 400min, the billet is rolled after being discharged and water is removed from the furnace, and the steel bar is obtained after being subjected to rough rolling at 1080 ℃, rolling at 980 ℃, pre-finish rolling at 900 ℃ and finish rolling at 800 ℃, and cooling by a cooling bed.
That is, the difference from example 1 is only that Ce is replaced with an equal amount of LaO and Al is replaced with an equal amount of Nb. The preparation method was the same as in example 1.
Comparative example 4
A rebar comprising, in weight percent: 0.09% of C, 0.25% of Si, 1% of Mn, 0.01% of P, 0.4% of CrO, 0.2% of Cu, 0.02% of V, 0.04% of Ti, 0.35% of Ce, 0.16% of Ni, 0.02% of Al, 0.55% of Mo, 0.2% of Re, and the balance of iron and unavoidable impurities.
The preparation method of the steel bar comprises the following steps:
(1) Smelting and refining: refining raw materials with the formula dosage at 1650 ℃ to obtain crude molten steel;
(2) Refining: placing the crude steelmaking water obtained in the step (1) in a refining furnace, controlling the temperature to 1700 ℃, and blowing argon at the bottom of the furnace to obtain refined molten steel;
(3) Continuous casting: controlling the casting temperature to 1520 ℃, and continuously casting to obtain a billet with the pulling speed of 2.3 m/min;
(4) Heating and rolling: and heating the steel billet, gradually heating, heating to 600 ℃ for the first time, heating to 850 ℃ for the second time, heating to 950 ℃ for the third time, and heating to 1000 ℃ for the fourth time. The total duration of four times of heating is 400min, the billet is rolled after being discharged and water is removed from the furnace, and the steel bar is obtained after being subjected to rough rolling at 1080 ℃, rolling at 980 ℃, pre-finish rolling at 900 ℃ and finish rolling at 800 ℃, and cooling by a cooling bed.
That is, only the difference from example 1 is that 0.55% mo and 0.2% re are also included. The preparation method was the same as in example 1.
1. Corrosion resistance of the reinforcing bars in the invention
The corrosion resistance is carried out according to GB/T33953-2017 corrosion resistant reinforcing steel bar for reinforced concrete, specifically NaHSO with the pH value of 4.6 and the concentration of 1mol/L 3 The simulated liquid was immersed for three days, and the corrosion rate was calculated, and the results were counted in table 1.
TABLE 1
As shown in the table, the steel bar of the invention has better corrosion resistance, and the corrosion rate can reach 0.09 g/(m) 2 In comparison with h), when the raw material proportion of the reinforcing steel bar is adjusted during preparation, the corrosion resistance rate is reduced, and even the corrosion resistance rate is reduced sharply.
2. Mechanical properties of the reinforcing bars in the invention
The mechanical properties are referred to the second part of steel for reinforced concrete of GB 1499.2-2019: hot rolling ribbed bars.
TABLE 2
The steel bar has excellent mechanical property, the tensile strength can reach 659MPa or more, the yield strength can reach 532MPa or more, the elongation after break is 14.3% or less, and the steel bar is integrally suitable for industrial production so as to meet the requirements of the corrosion-resistant steel bar market with excellent performance.
Finally, it should be noted that the above description is only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and that the simple modification and equivalent substitution of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit and scope of the technical solution of the present invention.
Claims (6)
1. A steel bar, characterized in that: the coating comprises the following components in percentage by weight: 0.1% of C, 0.18% of Si, 1.2% of Mn, 0.02% of P, 0.3% of Cr, 0.28% of Cu, 0.02% of V, 0.02% of Ti, 0.36% of Ce, 0.2% of Ni, 0.03% of Al, and the balance of iron and unavoidable impurities;
the corrosion rate of the steel bar is 0.09 g/(m) 2 H), the tensile strength is 705MPa; the yield strength was 613MPa and the elongation after break was 12.0%.
2. The method for preparing the reinforcing steel bar according to claim 1, wherein: the method comprises the following steps:
(1) Smelting and refining: refining raw materials with the formula dosage to obtain crude molten steel;
(2) Refining: placing the crude steelmaking water obtained in the step (1) in a refining furnace, and blowing argon at the bottom of the furnace to obtain refined molten steel;
(3) Continuous casting: controlling casting temperature and drawing speed, and continuously casting to obtain a steel billet;
(4) Heating and rolling: heating the steel billet gradually, discharging the steel billet from the furnace, removing scales by water, rolling, rough rolling, intermediate rolling, pre-finish rolling and finish rolling, and cooling to obtain the steel bar.
3. The preparation method according to claim 2, characterized in that: the temperature of the refining in step (1) is 1650-1680 ℃.
4. The preparation method according to claim 2, characterized in that: the control temperature of the refining furnace in the step (2) is 1700-1750 ℃.
5. The preparation method according to claim 2, characterized in that: the continuous casting in the step (3) is carried out in a step heating furnace, the casting temperature is 1520-1550 ℃, and the drawing speed is 2.3-2.5m/min.
6. The preparation method according to claim 2, characterized in that: the step (4) of gradually increasing the temperature specifically comprises: the first heating to 600 deg.C, the second heating to 850-900 deg.C, the third heating to 950-980 deg.C, and the fourth heating to 1000-1150 deg.C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210985672.7A CN115305416B (en) | 2022-08-17 | 2022-08-17 | Reinforcing steel bar and preparation method thereof |
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