CN110592472A - High-strength fire-resistant anti-seismic reinforcing steel bar and production method thereof - Google Patents
High-strength fire-resistant anti-seismic reinforcing steel bar and production method thereof Download PDFInfo
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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
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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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
- 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
- C22C38/02—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
- C22C38/04—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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
-
- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
Abstract
The invention discloses a high-strength fire-resistant anti-seismic reinforcing steel bar and a production method thereof, wherein the weight percentage of the steel bar is two or more than two of C0.15-0.20%, Si 0.7-0.9%, Mn 0.5-1.0%, Ni + Cr + Mo 0.8-2.0%, one or more than one of Nb + V0.1-0.25%, Ti 0.05-0.15%, B0.0015-0.0025%, N less than or equal to 0.003%, O less than or equal to 0.003%, and the balance of Fe and inevitable impurities; adding ferroniobium, ferrovanadium and ferrotitanium cored wires for alloying after refining LF white slag for 5min, wherein the free oxygen range in molten steel is 30-50ppm during LF refining tapping, the temperature of a continuous casting tundish is 1525-; the initial rolling temperature is 1000-; the yield strength of the finished hot-rolled steel bar product at room temperature is more than or equal to 650MPa, the yield ratio is less than or equal to 0.8, the elongation after breakage is more than or equal to 17%, the uniform elongation is more than or equal to 10%, and the yield strength at the high temperature of 600 ℃ is more than or equal to 435 MPa.
Description
Technical Field
The invention belongs to the field of high-strength steel bar production, and particularly relates to a high-strength fire-resistant anti-seismic steel bar and a production method thereof.
Background
At present, the buildings in China still mainly use reinforced concrete, wherein the consumption of ribbed steel bars in the steel for the buildings is the largest. With the emergence of multifunctional building structures such as high-rise, large-span, earthquake-proof, low-temperature-resistant and fire-resistant structures, the performance and quality of building steel, especially the steel bar for the building, become important parameters for the building industry to measure whether the building is safe and reliable and whether the design life of the building can be ensured; the occurrence of fire in high-rise buildings poses a serious threat and loss to the life safety and property of people, and people gradually recognize the importance of the fire resistance of the construction steel bars on the building safety.
According to the regulations of GB50016-2014 'architectural design fire prevention code', residential buildings with the building height of more than 27m and non-single-layer factory buildings, warehouses and other civil buildings with the building height of more than 24m, after the building height is increased, the fire resistance problem of the buildings directly relates to personal and property safety. GB/T28415-2012 states that the yield strength of the refractory steel at a high temperature of 600 ℃ must not be lower than 2/3 which is the standard yield strength at room temperature. The steel yield strength 2/3 at room temperature is defined in the safety design code of the steel structure in Japan and corresponds to the long-term allowable stress value of the material. According to the standard time temperature curve of fire, the temperature can reach 800 ℃ in 30 minutes after the fire happens, and can approach 1000 ℃ in 60 minutes. As the yield strength of the common steel for construction is obviously reduced to 1/2 of the yield strength at room temperature when the temperature reaches 600 ℃, the common steel for construction is easy to have disastrous consequences in the presence of fire, and the yield point of the fire-resistant steel can still keep 2/3 of standard yield strength at room temperature, thereby ensuring the safety performance of the building at high temperature.
The patent CN 102796961A relates to a 600MPa high-performance fire-resistant anti-seismic steel bar for concrete, which is prepared by smelting and casting molten steel, rolling a steel billet at the initial rolling temperature of 930-980 ℃, finish rolling at the finish rolling temperature of 800-850 ℃, and then controlling to cool until the temperature of the steel reaches 680-720 ℃. The requirements of rolling mills on rolling control and cooling control at lower temperature are higher, high-load rolling equipment is required, and most of the current steel bar production lines do not have the process conditions for producing the products. In addition, although the strength of the steel bar produced by the low-temperature rolling method is improved, the low-temperature rolling is easy to cause non-uniform deformation, so that the performance is non-uniform and the plasticity is reduced.
Patents CN 109097682A and CN 104032234 a both relate to refractory steel bars and a production method thereof, the refractory steel bars are produced by alloy composition design and rolling process control, but the normal temperature yield strength of the refractory steel bars is 456-645MPa, which is far not up to 650MPa level, and cannot meet the requirement of the current and future high-strength construction steel bars on the refractory performance.
The patent CN 105543704A relates to a high-strength refractory steel plate which is produced by adopting Cr, Mo, Nb, Ti, Ni and V composite alloying design and combining controlled rolling, but the steel plate can reach the required performance after heat treatment, the production control process is complex, and the production cost is higher.
In summary, at present, for refractory reinforcing steel bars, the yield strength at normal temperature is more than or equal to 650MPa, the yield strength at high temperature of 600 ℃ is more than or equal to 435MPa, and reinforcing steel bars meeting comprehensive anti-seismic requirements and production methods thereof are not reported yet.
Disclosure of Invention
The invention belongs to the field of high-strength steel bar production, and particularly relates to a 650 MPa-grade large-deformation-resistant steel bar and a production method thereof, wherein a component design system with composite addition of Ni, Cr, Mo, Nb, V and Ti is adopted, and the room-temperature yield strength of a finished hot-rolled steel bar product is more than or equal to 650MPa, the yield ratio is less than or equal to 0.80, the elongation after breakage is more than or equal to 17%, the uniform elongation is more than or equal to 10%, and the yield strength at the high temperature of 600 ℃ is more than or equal to 435 MPa. The innovation point belongs to the field of material science, and particularly belongs to the field of component design of metal materials.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-strength fire-resistant aseismic reinforcing bar is made up by using (wt%) two or more of C0.15-0.20%, Si 0.7-0.9%, Mn 0.5-1.0%, Ni + Cr + Mo 0.8-2.0%, one or more of Nb + V0.1-0.25%, Ti 0.05-0.15%, B0.0015-0.0025%, N less than or equal to 0.003%, O less than or equal to 0.003% and the rest is Fe and inevitable impurity.
Further, Ti and N are required to satisfy: ti/(10 XN) is more than or equal to 3 and less than or equal to 5.
Further, the carbon equivalent Ceq is 0.58% or less, Ceq is C + Mn/6+ (Cr + Mo + V)/5+ (Cu + Ni)/15.
Furthermore, two or more of 1.3 to 2.0 percent of Ni + Cr + Mo, 0.19 to 0.25 percent of Nb + V, 0.09 to 0.15 percent of Ti and 0.0019 to 0.0025 percent of B.
A high-strength fire-resistant anti-seismic reinforcing bar and a production method thereof comprise converter smelting, LF refining, continuous casting and rolling and cooling bed cooling; adding ferroniobium, ferrovanadium and ferrotitanium cored wires for alloying after refining the LF white slag for 5min, wherein the free oxygen range in the molten steel is 30-50ppm during LF refining tapping; the temperature of the continuous casting tundish is 1525 and 1555 ℃, the drawing speed is 2.8-3.0m/min, and the secondary cooling specific water amount is 2.1-2.4L/kg.
The soaking temperature of the heating furnace is 1220-.
Furthermore, the yield strength of the prepared hot-rolled steel bar finished product at room temperature is more than or equal to 650MPa, the yield ratio is less than or equal to 0.8, the elongation after breakage is more than or equal to 17%, the uniform elongation is more than or equal to 10%, and the yield strength at the high temperature of 600 ℃ is more than or equal to 435 MPa.
The core technology of the invention is that a component design system with composite addition of Ni, Cr, Mo, Nb, V and Ti is adopted, the steel-making and steel-rolling process design is combined through a comprehensive alloy strengthening means, the refractory steel bar is realized, the normal-temperature yield strength is more than or equal to 650MPa, the high-temperature yield strength at 600 ℃ is more than or equal to 435MPa, and the comprehensive fire-resistant and earthquake-resistant requirements are met.
The design principle of other alloy elements of the invention is as follows:
c: as one of important alloy elements in steel, the alloy can be dissolved in steel in a solid manner to effectively improve the yield strength and tensile strength of the steel, directly influences the strength of a steel bar, is low in price, and can be combined with vanadium and molybdenum in the steel to form carbonitride to improve the normal temperature strength and the refractory strength of a matrix. The invention adopts low carbon design, considers the strength, and controls the C content in the steel between 0.15 and 0.20 percent.
Si: the steel is deoxidizing element in steel making, and the strength can also be improved by solid solution strengthening, but the content of the deoxidizing element is controlled to be 0.7-0.9 percent while the weldability and the toughness of the material are damaged
Mn: the solid solubility product of the microalloy carbonitride in austenite can be enlarged, the deformation induced precipitation of excessive microalloy carbonitride in the rolling process is avoided, the disadvantage of welding performance caused by the increase of segregation tendency in a casting blank is prevented, and the content sum is controlled to be 0.5-1.0 percent by comprehensive consideration.
Mo, Cr, Ni: on one hand, Mo plays a role in Chinese high-temperature solid solution strengthening in the refractory steel, and has very obvious high-temperature strength increase, so that the YS ratio (the ratio of high-temperature yield strength to low-temperature yield strength) is increased. Meanwhile, Mo plays a certain role in precipitation strengthening in steel, and fine MoC in precipitates of Mo plays a prominent role in high-temperature strength of steel; cr can effectively improve the high-temperature oxidation resistance and creep resistance of steel, can effectively improve the high-temperature strength of the steel, can increase the hardenability of the steel by alloy elements such as Cr, Mo and the like, promotes the surface of a steel bar to form a further passive film by a proper amount of Cr, has a composite effect with Mo, and is easier to improve the fire resistance of the steel; ni can improve the low-temperature toughness of the alloy while improving the strength, and simultaneously ensure good welding performance. The comprehensive effect and cost are considered, and the range of Ni + Cr + Mo is controlled to be 0.8-2.0%.
Nb, V: the other main strengthening mode of the refractory steel is the precipitation strengthening effect of carbide, and micro-alloying elements Nb, V and Ti precipitate have good high-temperature stability and can generate beneficial influence on improving the high-temperature strength of the steel. On one hand, Nb has a fine-grain strengthening effect, and simultaneously can realize bainite second-phase strengthening by matching with process parameters, so that the steel has excellent toughness comprehensive performance, on the other hand, Nb can mainly improve the strengthening effect of vanadium nitride precipitation, and in addition, Nb is compounded with Mo to remarkably improve the high-temperature strength of Mo steel, but excessive addition of Nb can damage the toughness of a base metal and the toughness of HAZ. V is used as a precipitation strengthening element, and V (C, N) can be formed and dispersed in steel by adding a proper amount of V, so that a nano-scale V (C, N) compound can be precipitated in the rolling process, the ferrite nucleation point is increased, the ferrite grain growth is prevented, the obvious precipitation strengthening effect is achieved, the strength is improved, meanwhile, the growth of austenite grains in a welding heat affected zone can be effectively prevented, the toughness is improved, but the sensitivity of steel welding cracks is increased due to excessive addition. The total amount of Nb and V is comprehensively considered to be controlled to be 0.1-0.25 percent.
Ti: 0.05-0.15% of Ti is added. Can greatly improve the low-temperature toughness of a welding heat affected zone of the steel plate while improving the strength, can effectively fix the contents of oxygen and nitrogen in molten steel, ensures the yield of B element,
b: the invention controls the range of B to be 0.0015-0.0025, and the B is strongly partialized on the grain boundary to obviously improve the hardenability. The content of B can be properly added according to the strength grade, and the refractory steel with lower strength grade and higher C content can not be specially added. For the refractory steel with higher strength grade and lower C content, 0.0010-0.0020% can be added, and excessive boron will produce B-containing precipitated phase to bring adverse effect, so the B content is controlled at 0.0015-0.0025%.
In addition, in order to ensure that the reinforcing steel bar has better welding manufacturability, Ceq is designed to be less than or equal to 0.58 percent.
The design principle of the steelmaking process of the invention is as follows:
because the target components contain more microalloying elements such as niobium, vanadium, titanium and boron, the ferroniobium, ferrovanadium and ferrotitanium cored wires are added after the LF white slag is refined for 5min for alloying, the free oxygen range in the molten steel is 30-50ppm during LF refining tapping, and then boron alloying is carried out, so that on one hand, the yield of elements is controlled and ensured, on the other hand, molten steel splashing in the alloy adding process is reduced, and the refined field control is facilitated; because the steel contains more Cr, Ni, Mo and other alloy elements, the fluidity of the molten steel is poorer than that of the common low alloy steel, the tundish temperature is controlled to be 1525-.
The design principle of the steel rolling process of the invention is as follows:
in order to fully exert the solid solution strengthening and precipitation strengthening effects of the microalloying elements, comprehensively consider the fine grain strengthening effect of the elements at the same time, combine the characteristics of the production line, exert the comprehensive effects of controlled rolling and controlled cooling on strength and plasticity, adopt a proper higher soaking temperature and a proper lower initial rolling temperature and upper cooling bed temperature, thus controlling the heating temperature range to be 1220 plus material 1280 ℃ and the heat preservation time to be 50-60 min; the initial rolling temperature is controlled to be 1000-.
According to the method, the large deformation resistant steel bar with the pressure of 650MPa or more can be obtained, the method has obvious advantages in the aspect of improving the safety level for coping with natural disasters and external damages in building structures such as major protection projects and the like, and simultaneously can reduce the consumption of the steel bar and optimize the structural design.
Compared with the prior art, the invention has the beneficial effects that through the innovative alloy component design, at least:
1. by adopting the component design of composite addition of Ni, Cr, Mo and Nb, V, Ti and B, the yield strength at room temperature is more than or equal to 650MPa, and the yield strength at high temperature of 600 ℃ is more than or equal to 435 MPa;
2. aiming at the ultrahigh-strength anti-seismic steel bar, the yield ratio is less than or equal to 0.80, the elongation after fracture is more than or equal to 17 percent, the uniform elongation is more than or equal to 10 percent, the strength allowance is sufficient, and the steel bar has good plastic deformation and anti-seismic capability;
3. the carbon equivalent is less than or equal to 0.58 percent, thereby ensuring the improvement of processing application performances such as cold bending, welding and the like;
4. the production process is fit with the characteristics of a conventional deformed steel bar production line, and is beneficial to simplifying the process and controlling the cost.
Detailed Description
The technical solution of the present invention will be further described with reference to the following examples.
The specific compositions of examples 1-9 and comparative examples 1-4 are shown in Table 1, and examples 1-9 were produced according to the following process flow using a short production process of converter/electric furnace smelting, billet continuous casting and cooling bed:
(1) in the smelting and casting processes, smelting is carried out according to the component range and the element proportion relation in the claims, ferroniobium, ferrovanadium and ferrotitanium cored wires are added for alloying after LF white slag is refined for 5min, and the free oxygen range in molten steel is 30-50ppm during LF refining tapping; the temperature of the continuous casting tundish is 1525 and 1555 ℃, the drawing speed is 2.8-3.0m/min, the secondary cooling specific water amount is 2.1-2.4L/kg, and the continuous casting tundish is cast into a small square billet with the cross section of 150mm multiplied by 150 mm.
(2) In the processes of steel rolling and heating, the heating temperature of the small square billet is 1220-.
The mechanical properties of examples 1 to 9 and comparative examples 1 to 4 are compared in Table 2.
As can be seen from tables 1 and 2, compared with the comparative example, in the embodiment adopting the technical scheme of the invention, the yield strength of the system is not less than 650MPa, the yield ratio is not more than 0.80, the maximum force elongation is not less than 10%, the strength allowance is sufficient, the yield strength at the high temperature of 600 ℃ is not less than 435MPa, and the system has outstanding fire resistance and shock resistance and is far superior to the comparative example.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Table 1 examples the chemical composition (weight percent, wt%)
TABLE 2 mechanical properties of the examples
Claims (7)
1. A high-strength fire-resistant anti-seismic reinforcing steel bar is characterized in that: according to weight percentage, 0.15 to 0.20 percent of C, 0.7 to 0.9 percent of Si, 0.5 to 1.0 percent of Mn, two or more than two of 0.8 to 2.0 percent of Ni + Cr + Mo, one or more than one of 0.1 to 0.25 percent of Nb + V, 0.05 to 0.15 percent of Ti, 0.0015 to 0.0025 percent of B, less than or equal to 0.003 percent of N, less than or equal to 0.003 percent of O, and the balance of Fe and inevitable impurities.
2. A high-strength fire-resistant anti-seismic reinforcing bar according to claim 1, wherein: according to the weight percentage, Ti and N need to satisfy: ti/(10 XN) is more than or equal to 3 and less than or equal to 5.
3. A high-strength fire-resistant anti-seismic reinforcing bar according to claim 1, wherein: the carbon equivalent Ceq is less than or equal to 0.58 percent, wherein Ceq is C + Mn/6+ (Cr + Mo + V)/5+ (Cu + Ni)/15.
4. A high-strength fire-resistant anti-seismic reinforcing bar according to claim 1, wherein: according to the weight percentage, two or more than two of 1.3 percent to 2.0 percent of Ni + Cr + Mo, one or more than one of 0.19 percent to 0.25 percent of Nb + V, 0.09 percent to 0.15 percent of Ti and 0.0019 percent to 0.0025 percent of B.
5. A high-strength fire-resistant anti-seismic steel bar and a production method thereof as claimed in claim 1, 2, 3 or 4, comprising converter smelting, LF refining, continuous casting and rolling, and cooling by a cooling bed, wherein: adding ferroniobium, ferrovanadium and ferrotitanium cored wires for alloying after refining the LF white slag for 5min, wherein the free oxygen range in the molten steel is 30-50ppm during LF refining tapping; the temperature of the continuous casting tundish is 1525 and 1555 ℃, the drawing speed is 2.8-3.0m/min, and the secondary cooling specific water amount is 2.1-2.4L/kg.
6. A high-strength fire-resistant anti-seismic steel bar and a production method thereof according to claim 5, wherein: the soaking temperature of the heating furnace is 1220-.
7. The high-strength fire-resistant anti-seismic steel bar and the production method thereof according to claim 6, wherein: the yield strength of the finished hot-rolled steel bar product at room temperature is more than or equal to 650MPa, the yield ratio is less than or equal to 0.8, the elongation after breakage is more than or equal to 17%, the uniform elongation is more than or equal to 10%, and the yield strength at the high temperature of 600 ℃ is more than or equal to 435 MPa.
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| CN110129675A (en) * | 2019-05-23 | 2019-08-16 | 江苏省沙钢钢铁研究院有限公司 | High tensile reinforcement and its production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111235466A (en) * | 2020-02-26 | 2020-06-05 | 江苏省沙钢钢铁研究院有限公司 | TiC dispersion strengthening complex phase reinforcing steel bar and production method thereof |
| CN115181882A (en) * | 2022-09-09 | 2022-10-14 | 江苏省沙钢钢铁研究院有限公司 | 500 MPa-grade refractory deformed steel bar and production method thereof |
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