CN108220798B - 460 MPa-level anti-seismic fireproof building steel and preparation method thereof - Google Patents
460 MPa-level anti-seismic fireproof building steel and preparation method thereof Download PDFInfo
- Publication number
- CN108220798B CN108220798B CN201810241444.2A CN201810241444A CN108220798B CN 108220798 B CN108220798 B CN 108220798B CN 201810241444 A CN201810241444 A CN 201810241444A CN 108220798 B CN108220798 B CN 108220798B
- Authority
- CN
- China
- Prior art keywords
- rolling
- steel
- equal
- temperature
- controlled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
-
- 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
-
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
460 MPa-level earthquake-resistant and fire-resistant building steel and a preparation method thereof, belonging to the field of building steel. The chemical components are as follows: c: 0.03 to 0.08%, Mn: 1.0-1.8%, Si: 0.1-0.5%, Cr: 0.2-0.7%, Mo: 0.1-0.3%, Ti: 0.05-0.12%, V: 0.04-0.12%, Nb: 0.01-0.06%, Al: 0.01-0.05%, P is less than or equal to 0.008%, S: less than or equal to 0.002 percent, and the balance of iron and inevitable trace chemical elements. Adopting conventional vacuum smelting and casting to form a blank; heating a casting blank and performing conventional heat preservation; rough rolling and controlling the temperature; finish rolling and controlling the finishing temperature; naturally cooling to a certain temperature; and (5) cooling the water to room temperature. And obtaining a martensite/bainite and ferrite dual-phase structure with fine grains by a controlled rolling and cooling mode. The steel is delivered through the TMCP state, a complex heat treatment process is not needed, a wider process window is provided, the yield strength is greater than or equal to 460MPa, the tensile strength is 670-800 MPa, the elongation after fracture is greater than or equal to 26%, KV2 at minus 40 ℃ is greater than or equal to 250J, and the yield ratio is less than 0.75, and the steel can be widely applied to building steel requiring high strength, shock resistance, fire resistance and other requirements simultaneously on high and super high floors.
Description
Technical Field
The invention belongs to the field of structural steel for buildings, and particularly designs 460 MPa-level anti-seismic fire-resistant building steel and a preparation method thereof, which are particularly suitable for TMCP (thermal mechanical control processing) process production.
Background
At present, the anti-seismic steel plate for the building structure with the yield strength of below 460MPa is gradually popularized and applied in large buildings domestically and internationally, but with the rapid development of high-rise buildings and the increasing consideration of the safety performance of the buildings, higher requirements on the anti-seismic and fire resistance performance of the building steel are provided.
In consideration of earthquake resistance, most of 460MPa grade building steels require the yield ratio to be less than 0.8 at present, and the development of the building steel with lower yield ratio has a key significance for improving the earthquake resistance.
At present, the fire resistance of the steel structure is improved, a very thick fire-proof coating layer is mainly sprayed to protect the steel structure, the steel structure building cost is increased by times by spraying the fire-proof coating, the construction period is prolonged, and splashing of spraying operation can cause environmental pollution, so that the fire-proof coating is reduced or even not used to become key power for developing fire-proof steel.
Through retrieval, the document with the publication number of CN103866188A discloses a fire-resistant, corrosion-resistant and earthquake-resistant building steel with the yield strength of 460MPa and a production method thereof. The steel comprises the following chemical components in percentage by weight: c: 0.095-0.180%, Si: 0.28 to 0.55%, Mn: 1.40-1.60%, P: less than or equal to 0.008 percent, S: less than or equal to 0.002%, Nb: 0.014 to 0.045%, Ti: 0.004-0.030%, V: 0.034-0.044%, Mo: 0.09-0.29, W: 0.06-0.12%, Mg: 0.0080-0.0100%, Sn: 0.08-0.13%, O: less than or equal to 0.0016 percent; the process comprises the following steps: desulfurizing molten iron; smelting in a converter: and (3) vacuum treatment: heating a casting blank: and (3) sectional rolling: and (3) cooling: and (5) standby. In order to improve the strength of the steel, the content of C is relatively high, so that the welding performance of the steel is influenced to a certain extent, and the test shows that the impact energy is minus 20 ℃, so that the impact toughness of the steel is further examined at lower and harsher temperature, the yield ratio of the steel is close to 0.80, and the anti-seismic performance of the steel is limited.
Through retrieval, the document with the publication number of CN103882318A discloses a molybdenum-saving type multi-element composite microalloy anti-seismic refractory steel and a manufacturing method thereof, and the weight percentage of the chemical components are as follows: c: 0.03-0.09%, Si: 0-0.5%, Mn: 0.50-1.50%, P: below 0.02%, S: below 0.01%, Cr: 0.35-1.00%, Mo: 0.15 to 0.20%, Nb: 0.05-0.15%, V: 0-0.10%, Ti: 0.01-0.025%, B: 0-0.0030%, Al: 0.01-0.06%, and the balance of Fe and inevitable impurities. The steel is characterized in that Mo is replaced by Nb, V and Ti, MC type precipitates are mainly precipitated in ferrite or bainite, the matrix is strengthened through the precipitation strengthening effect of the precipitates, and good strength at high temperature is guaranteed, but MC type carbide is easy to coarsen along with the prolonging of heat preservation time, in addition, the intelligent precipitation method in case of fire is difficult to realize under the condition of saving cost, the high-temperature strength under the condition of heat preservation for 3 hours is only guaranteed, the strengthening effect is greatly reduced if the heat preservation time is prolonged continuously, and the safety of the steel for buildings needs to be further verified.
None of the above documents suggests that the yield ratio is less than 0.75 or that interphase precipitation is used in combination with MC type carbide high temperature precipitation for the purpose of fire resistance.
Disclosure of Invention
The invention aims to provide building steel which has the advantages that on the premise that the service performance meets the requirements of GB/T1951 'Low-alloy high-strength structural steel', the building steel is delivered through TMCP (thermal mechanical control processing) state, no complex heat treatment process is needed, the process window is wide, the yield strength is more than or equal to 460MPa, the tensile strength is 670-800 MPa, the percentage elongation after fracture is more than or equal to 26 percent, the-40 ℃ KV2 is more than or equal to 250J, and the yield ratio is less than 0.75, and the building steel can be widely applied to high-rise and super-high-rise building steel which simultaneously requires high strength, shock resistance.
The invention aims to obtain a large amount of interphase precipitates through a TMCP (thermal mechanical control processing) process by adding Nb, V and Ti in a certain proportion, accumulate a certain dislocation density, ensure a certain MC type carbide precipitate at high temperature in the later period and achieve excellent fire resistance; the interphase precipitation is obtained by controlling the cooling, the ferrite content is regulated, the yield strength and the yield ratio are adjusted, and the good earthquake resistance is achieved.
The 460 MPa-grade earthquake-resistant and fire-resistant construction steel is characterized by comprising the following chemical components in percentage by weight: c: 0.03 to 0.08%, Mn: 1.0-1.8%, Si: 0.1-0.5%, Cr: 0.2-0.7%, Mo: 0.1-0.3%, Ti: 0.05-0.12%, V: 0.04-0.12%, Nb: 0.01-0.06%, Al: 0.01-0.05%, P is less than or equal to 0.008%, S: less than or equal to 0.002 percent, and the balance of iron and inevitable trace chemical elements.
The preparation method of the 460 MPa-level anti-seismic and fireproof building steel adopts a converter or an electric furnace for smelting, and adopts continuous casting
Casting and rolling adopt controlled rolling and controlled cooling, and the method is characterized in that: the technical parameters controlled in the rolling process are as follows:
1) controlled rolling of heavy and medium plate mill
The method comprises the following steps of (1) cogging a continuous casting blank or a casting blank, then loading the billet into a heating furnace for heating, wherein the heating temperature is 1100-1250 ℃, the time is 1-4 hours, and then rolling is carried out, and the cogging temperature is 1050-1180 ℃; the rolling process of the heavy and medium plate mill comprises the following steps: rough rolling for 3-6 times, and finish rolling for 5-10 times, wherein the temperature after the rough rolling is controlled to be 950-1050 ℃, and the finish rolling temperature is 780-900 ℃;
2) controlled cooling after rolling
After the rolled steel plate is cooled in the air to 600-700 ℃, laminar cooling is carried out to the room temperature.
Further, according to the 460 MPa-grade anti-seismic and fireproof building steel prepared by the method, the structure after controlled rolling and controlled cooling is a martensite/bainite + ferrite dual-phase structure, the proportion of ferrite is 50-90%, and a large amount of interphase precipitates exist in the ferrite; the yield strength is more than or equal to 460MPa, the tensile strength is 670-800 MPa, the elongation after fracture is more than or equal to 26%, the KV2 at minus 40 ℃ is more than or equal to 250J, the yield ratio is less than 0.75, and the fire resistance is as follows: the yield strength is not lower than 2/3 at room temperature after the temperature is kept for 3 hours at 600 ℃.
The main chemical composition of the invention is limited by the following reasons:
carbon: carbon is one of the most important elements determining the strength of steel, can play a good role in solid solution strengthening, is also an essential element for interphase precipitation and MC type carbide precipitation, improves the yield strength and tensile strength of the steel with the increase of the carbon content, but reduces the elongation performance and impact toughness of the steel, reduces the corrosion resistance, and obviously shows the welding performance of the steel with the excessively high carbon content, so that the weight percentage of the carbon element content in the invention is 0.03-0.08% in order to ensure that the steel has good comprehensive performance.
Silicon: one of the deoxidizing elements in steel, silicon, can improve the corrosion resistance of steel, and is often added into stainless steel, low alloy steel and corrosion-resistant alloys to improve the corrosion resistance of the alloys, so that the alloys have the performances of resisting chloride stress corrosion cracking, pitting corrosion, hot concentrated nitric acid corrosion, oxidation, seawater corrosion and the like, but excessive silicon can deteriorate the toughness and the welding performance of the steel, and meanwhile, the silicon has strong solid solution strengthening effect, but the excessive silicon can deteriorate the toughness and the welding performance of the steel. Therefore, the content of the silicon element in the invention is 0.1-0.5% by weight.
Manganese: manganese is an important toughening element, the components are low, the strength of the steel is obviously improved along with the increase of the manganese content, the processing performance of the steel is improved, and the ductile-brittle transition temperature is hardly changed. However, too high manganese content may inhibit ferrite transformation, affect yield strength of steel, and be detrimental to yield ratio control. Therefore, the manganese content of the invention is 1.0-1.8% by weight.
Phosphorus and sulfur: phosphorus and sulfur are harmful impurity elements that are difficult to avoid in steel. High phosphorus can cause segregation, influence the structural uniformity of steel and reduce the plasticity of the steel; sulphur tends to form sulphide inclusions which are detrimental to low temperature toughness and can cause anisotropy of properties, while severely affecting the strain ageing of the steel. Therefore, the contents of phosphorus and sulfur in the steel are strictly limited, the weight percentage of the phosphorus element content is controlled to be less than or equal to 0.008 percent, and the weight percentage of the sulfur element content is controlled to be less than or equal to 0.002 percent.
Chromium: the chromium can improve the strength, hardness and atmospheric corrosion resistance of the steel, and has more obvious effect when other alloy elements are added. Chromium slows down the decomposition speed of austenite, remarkably improves the hardenability of steel, has a secondary hardening effect, and increases the temper brittleness tendency of steel. However, if the chromium content is too high, the toughness of the base material and the heat affected zone may be reduced. Therefore, the content of the chromium element is 0.2-0.7% by weight.
Molybdenum: molybdenum obviously improves the hardenability of steel, reduces the temper brittleness, improves the delayed fracture resistance of steel, has a solid solution strengthening effect on ferrite, can improve the stability of carbide, and reduces the coarsening tendency, so that the room temperature strength and the high temperature strength of the steel are improved, the low temperature toughness and the welding performance are poor due to excessively high molybdenum, and the cost of the molybdenum is high, so the weight percentage of the molybdenum element content is 0.1-0.3%.
Niobium: niobium is dissolved in austenite in a rolling process and is subjected to deformation induction to precipitate niobium carbonitride particles, so that the non-recrystallization temperature of austenite is obviously improved, austenite grains are refined, further, grains of ferrite and the like are refined, and the strength is improved. Niobium is dissolved in austenite in a solid state, hardenability can be improved, niobium carbide particles precipitated in the firing process or a second phase is compositely precipitated with vanadium and molybdenum, and high-temperature strength is improved. Therefore, the content of the niobium element is 0.01 to 0.06 percent by weight.
Vanadium: the vanadium has lower full solid solution temperature, is basically completely solid-dissolved during soaking, and can effectively improve hardenability and recrystallization temperature through solid solution in the rolling process; under the air cooling after rolling, vanadium is easy to separate out in the form of interphase separation along with the transformation process from austenite to ferrite, and can separate out from ferrite and bainite alone or separate out from niobium and molybdenum composite precipitates in the ignition process of steel, thereby achieving the purpose of improving the high-temperature strength. Therefore, the vanadium content of the vanadium-containing composite material is 0.04-0.12% by weight.
Titanium: the titanium has low solid solubility in steel, is easy to precipitate in austenite, is pinned at a crystal boundary, prevents grains from growing and recrystallizing, and can play a role in refining the grains. Therefore, the content of the titanium element is 0.05 to 0.12 percent by weight.
Aluminum: the aluminum is a strong deoxidizing element and can be combined with nitrogen to form aluminum nitride to play a role in refining grains, so that the aluminum content is 0.01-0.05% by weight.
In conclusion, on the basis of low alloy steel, a certain amount of elements such as Cr, Si and the like are added to improve the corrosion resistance of the steel, a certain amount of elements such as Mo, Nb, V, Ti and the like are added, a large amount of interphase precipitation is precipitated in the transformation process from austenite to ferrite by controlling a TMCP (thermal mechanical control processing) process, crystal grains are refined, the elements which are not precipitated in the interphase have a good solid solution strengthening effect in a ferrite matrix, MC type carbide is precipitated in the later ignition process and acts together with the interphase precipitation to improve the high-temperature strength of the steel, so that the steel has good fire resistance, and in addition, the content of ferrite is reasonably regulated and controlled by controlling the TMCP process, the yield ratio of the steel is regulated and controlled, so that the steel has excellent earthquake resistance. The invention adopts TMCP technology to deliver, does not need complex heat treatment technology, and has wider process window, thereby having excellent application prospect in both production realizable degree and cost.
Drawings
FIG. 1 is a phase diagram of gold observed by an optical microscope after etching with nital in example 1 of the present invention
FIG. 2 is a TEM image of interphase deposition observed by a transmission electron microscope in example 1 of the present invention
FIG. 3 is a TEM image of interphase separation observed by a transmission electron microscope after incubation at 600 ℃ for 3 hours in example 1 of the present invention
Detailed Description
The present invention is further illustrated by the following specific examples, which are provided for illustrative purposes only and are not to be construed as limiting the scope of the present invention.
The invention is further described below:
table 1 shows the chemical compositions and the contents in percentage by weight of each example and comparative example of the present invention
Table 2 shows the value lists of the main rolling process parameters of the examples and comparative examples of the present invention
Table 3 shows the results of mechanical and fire resistance tests of the inventive and comparative examples
The embodiments of the invention are produced according to the following process steps:
smelting by adopting a converter or an electric furnace, adopting continuous casting for casting, and being characterized in that: the technical parameters controlled in the rolling process are
1) Controlled rolling of heavy and medium plate mill
The method comprises the following steps of (1) placing a continuous casting blank or a casting blank after cogging into a heating furnace for heating, wherein the heating temperature is 1100-1250 ℃, the time is 1-4 hours, and the rolling temperature after heating is 1050-1180 ℃; the rolling process of the heavy and medium plate mill comprises the following steps: the rough rolling is performed for 3-6 times, the finish rolling is performed for 5-10 times, the temperature after the rough rolling is controlled to be 950-1050 ℃, and the finish rolling temperature is 780-900 ℃.
2) Controlled cooling after rolling
After the rolled steel plate is cooled in the air to 600-700 ℃, laminar cooling (ultra-fast cooling) is carried out to the room temperature.
TABLE 1 tabulated chemical compositions and weight percent contents of examples of the invention and comparative examples
| Examples | C | Mn | Si | Cr | Mo | Nb | Ti | V | Al | P | S |
| 1 | 0.055 | 1.52 | 0.20 | 0.5 | 0.22 | 0.02 | 0.078 | 0.089 | 0.045 | 0.005 | 0.0014 |
| 2 | 0.072 | 1.42 | 0.24 | 0.35 | 0.21 | 0.04 | 0.06 | 0.09 | 0.038 | 0.007 | 0.0018 |
| 3 | 0.062 | 1.61 | 0.17 | 0.39 | 0.20 | 0.03 | 0.08 | 0.06 | 0.03 | 0.006 | 0.0012 |
| 4 | 0.045 | 1.57 | 0.25 | 0.45 | 0.24 | 0.04 | 0.05 | 0.082 | 0.048 | 0.007 | 0.0014 |
| Comparative example 1 | 0.05 | 1.48 | 0.19 | 0.68 | 0.11 | 0.03 | 0.085 | 0.04 | 0.04 | 0.006 | 0.0015 |
| Comparative example 2 | 0.1 | 1.82 | 0.51 | 0.56 | 0.26 | 0.01 | 0.05 | 0.04 | 0.02 | 0.005 | 0.0011 |
TABLE 2 tabulation of values of main process parameters for rolling in each example of the invention and comparative example
Table 3 shows the results of mechanical and fire resistance tests of the inventive and comparative examples
As can be seen from the data in table 3:
1) the yield strength, the yield ratio, the elongation and the impact toughness of the steel product in the embodiment of the invention all meet the requirements of 460 MPa-level earthquake-resistant and fire-resistant construction steel, while the obvious strength of the comparative example 1 does not meet the requirements, and the elongation and the impact toughness of the steel in the comparative example 2 are poorer and do not reach the standard.
2) The steel material of the embodiment of the invention has excellent fire resistance, meets the specification that the yield strength is not lower than 2/3 at room temperature after the heat preservation at 600 ℃ for three hours, and the fire resistance of the comparative examples 1 and 2 obviously does not meet the requirement.
By comparing fig. 2 and fig. 3, it can be clearly seen that in example 1, the steel product structure has obvious interphase precipitation, the interphase precipitation has no obvious coarsening phenomenon after being kept at 600 ℃ for three hours, the size is still below dozens of nanometers, the precipitation strengthening effect still exists, and after being kept at 600 ℃, a certain amount of MC type carbide is precipitated to achieve a good ignition precipitation effect, so that the fire resistance of the example is excellent.
Claims (2)
1. The 460 MPa-grade earthquake-resistant and fire-resistant construction steel is characterized by comprising the following chemical components in percentage by weight: c: 0.03 to 0.08%, Mn: 1.0-1.8%, Si: 0.1-0.5%, Cr: 0.2-0.7%, Mo: 0.1-0.3%, Ti: 0.05-0.12%, V: 0.04-0.12%, Nb: 0.01 to 0.04%, Al: 0.01-0.05%, P is less than or equal to 0.008%, S: less than or equal to 0.002 percent, and the balance of iron and inevitable trace chemical elements;
the 460 MPa-grade anti-seismic and fireproof building steel is smelted by a converter or an electric furnace, continuous casting is adopted for casting, controlled rolling and controlled cooling are adopted for rolling, the structure after controlled rolling and controlled cooling is a martensite/bainite + ferrite dual-phase structure, the proportion of ferrite is 50-90%, and a large amount of interphase precipitates exist in the ferrite; the yield strength is more than or equal to 460MPa, the tensile strength is 670-800 MPa, the elongation after fracture is more than or equal to 26 percent, and the KV at the temperature of minus 40 ℃ is2More than or equal to 250J and the yield ratio is less than 0.75, and the fire resistance is as follows: the yield strength is not lower than 2/3 at room temperature after the temperature is kept for 3 hours at 600 ℃.
2. The preparation method of the 460 MPa-level earthquake-resistant and fire-resistant construction steel according to claim 1, wherein the construction steel is smelted by a converter or an electric furnace, the casting is continuous casting, and the rolling is controlled rolling and cooling, and the method is characterized in that: the technical parameters controlled in the rolling process are as follows:
1) controlled rolling of heavy and medium plate mill
The method comprises the following steps of (1) cogging a continuous casting blank or a casting blank, then loading the billet into a heating furnace for heating, wherein the heating temperature is 1100-1250 ℃, the time is 1-4 hours, and then rolling is carried out, and the cogging temperature is 1050-1180 ℃; the rolling process of the heavy and medium plate mill comprises the following steps: rough rolling for 3-6 times, and finish rolling for 5-10 times, wherein the temperature after the rough rolling is controlled to be 950-1050 ℃, and the finish rolling temperature is 780-900 ℃;
2) controlled cooling after rolling
After the rolled steel plate is cooled in the air to 600-700 ℃, laminar cooling is carried out to the room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810241444.2A CN108220798B (en) | 2018-03-22 | 2018-03-22 | 460 MPa-level anti-seismic fireproof building steel and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810241444.2A CN108220798B (en) | 2018-03-22 | 2018-03-22 | 460 MPa-level anti-seismic fireproof building steel and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108220798A CN108220798A (en) | 2018-06-29 |
| CN108220798B true CN108220798B (en) | 2020-04-24 |
Family
ID=62659278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810241444.2A Active CN108220798B (en) | 2018-03-22 | 2018-03-22 | 460 MPa-level anti-seismic fireproof building steel and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108220798B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109628836B (en) * | 2019-01-02 | 2020-10-09 | 北京科技大学 | High-strength anti-seismic fire-resistant steel for building structure and preparation method thereof |
| CN110106322B (en) * | 2019-05-22 | 2021-03-02 | 武汉钢铁有限公司 | High-strength steel for thin engineering machinery and plate shape control method |
| CN110724805A (en) * | 2019-10-22 | 2020-01-24 | 河南晖睿智能科技有限公司 | Preparation method of high-strength anti-seismic steel for building |
| CN112501496B (en) * | 2020-10-20 | 2022-01-04 | 江苏省沙钢钢铁研究院有限公司 | On-line quenching type double-phase low-yield-ratio steel plate and production method thereof |
| CN112501499A (en) * | 2020-10-21 | 2021-03-16 | 南京钢铁股份有限公司 | 100 mm-thick anti-seismic fire-resistant steel plate with yield strength of 460MPa and manufacturing method thereof |
| CN112501500B (en) * | 2020-10-28 | 2022-03-01 | 南京钢铁股份有限公司 | 100mm extra-thick shock-resistant refractory steel with yield strength of 345MPa and preparation method thereof |
| CN112593155B (en) * | 2020-12-08 | 2022-04-22 | 东北大学 | Anti-seismic, fire-resistant and weather-resistant steel plate for high-strength building structure and preparation method thereof |
| CN112692074A (en) * | 2020-12-11 | 2021-04-23 | 南京钢铁股份有限公司 | Hot-rolled thin-specification anti-seismic refractory steel plate with yield strength of 460MPa and preparation method thereof |
| CN113215499A (en) * | 2021-05-12 | 2021-08-06 | 南京钢铁股份有限公司 | Ultra-thick anti-seismic fire-resistant steel plate with 390 MPa-grade yield strength and manufacturing method thereof |
| CN113528972B (en) * | 2021-09-17 | 2022-01-18 | 江苏省沙钢钢铁研究院有限公司 | 460 MPa-level shock-resistant fire-resistant super-thick steel plate and production method thereof |
| CN113981323B (en) * | 2021-10-29 | 2022-05-17 | 新余钢铁股份有限公司 | Q420qE steel plate for improving fire straightening performance and manufacturing method thereof |
| CN114351045A (en) * | 2021-12-02 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Economical refractory hot-rolled steel plate with yield strength of 420MPa and preparation method thereof |
| CN114892096B (en) * | 2022-06-27 | 2023-04-11 | 钢铁研究总院有限公司 | Low-carbon high-strength anti-seismic fire-resistant steel bar and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400053A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Steel plate for building structure with yield strength of 460 MPa, and manufacturing method thereof |
| CN103614638A (en) * | 2013-12-12 | 2014-03-05 | 南京钢铁股份有限公司 | High-niobium Q460-grade fire-resistant steel and manufacturing method thereof |
| CN103710633A (en) * | 2013-12-20 | 2014-04-09 | 钢铁研究总院 | V microalloyed Mo anti-seismic refractory steel and manufacturing method thereof |
| CN103882318A (en) * | 2014-03-03 | 2014-06-25 | 南京钢铁股份有限公司 | Molybdenum-saving type multi-component microalloy shock-resistant fire-resistant steel and preparation method of steel |
-
2018
- 2018-03-22 CN CN201810241444.2A patent/CN108220798B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102400053A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Steel plate for building structure with yield strength of 460 MPa, and manufacturing method thereof |
| CN103614638A (en) * | 2013-12-12 | 2014-03-05 | 南京钢铁股份有限公司 | High-niobium Q460-grade fire-resistant steel and manufacturing method thereof |
| CN103710633A (en) * | 2013-12-20 | 2014-04-09 | 钢铁研究总院 | V microalloyed Mo anti-seismic refractory steel and manufacturing method thereof |
| CN103882318A (en) * | 2014-03-03 | 2014-06-25 | 南京钢铁股份有限公司 | Molybdenum-saving type multi-component microalloy shock-resistant fire-resistant steel and preparation method of steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108220798A (en) | 2018-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108220798B (en) | 460 MPa-level anti-seismic fireproof building steel and preparation method thereof | |
| CN109628836B (en) | High-strength anti-seismic fire-resistant steel for building structure and preparation method thereof | |
| US11761050B2 (en) | High-strength low-carbon bainitic fire-resistant steel and preparation method thereof | |
| CN111101063B (en) | 690 MPa-grade anti-seismic, corrosion-resistant and fire-resistant medium plate steel and manufacturing method thereof | |
| CN112899579B (en) | Corrosion-resistant high-strength light steel and preparation method thereof | |
| CN105543704A (en) | High-strength, shock-resistant, fire-proof and corrosion-proof steel plate and manufacturing method | |
| CN108728742B (en) | Shock-resistant, fire-resistant and corrosion-resistant steel and manufacturing method of medium-thickness steel plate and thin steel plate | |
| CN101649420A (en) | Ultra-strength, high toughness and low yield ratio steel and steel plate and manufacturing method thereof | |
| CN113249645B (en) | High-ductility and ultrahigh-strength ductile steel and preparation method thereof | |
| WO2023087833A1 (en) | High-strength steel with good weather resistance and manufacturing method therefor | |
| CN112195402B (en) | Precipitation-strengthened high-strength and high-toughness medium manganese steel plate and preparation method thereof | |
| CN114836694B (en) | Marine seawater corrosion fatigue resistant ultra-high strength steel and manufacturing method thereof | |
| CN114959418B (en) | Marine seawater corrosion fatigue resistant high-strength steel and manufacturing method thereof | |
| CN114517254B (en) | Low-temperature-resistant flat bulb steel for ship and preparation method thereof | |
| CN110592491B (en) | High-wear-resistance martensite/austenite dual-phase wear-resistant steel plate and manufacturing method thereof | |
| CN113667905A (en) | Ultra-high-strength high-performance maraging stainless steel and warm rolling preparation method thereof | |
| CN116479344B (en) | Cu-containing low-alloy high-strength steel with yield strength of 600MPa and manufacturing method thereof | |
| CN113061815A (en) | 800 MPa-grade quenched and tempered high-strength steel with stable full-section impact performance and production method thereof | |
| CN111549297B (en) | Preparation method of high-strength anti-seismic weather-resistant fire-resistant low-temperature-resistant easily-welded H-shaped steel | |
| CN112593155B (en) | Anti-seismic, fire-resistant and weather-resistant steel plate for high-strength building structure and preparation method thereof | |
| CN114480949B (en) | 690 MPa-grade low-yield-ratio weather-resistant welding structural steel, steel plate and manufacturing method thereof | |
| CN111154962B (en) | Anti-seismic corrosion-resistant refractory steel and preparation method thereof | |
| CN111996453B (en) | Multi-precipitation enhanced type anti-seismic, corrosion-resistant and fire-resistant H-shaped steel and preparation method thereof | |
| CN116200662B (en) | Tempered high-performance bridge weathering steel with low yield ratio and manufacturing method thereof | |
| CN113930689B (en) | X65-grade ultralow temperature-resistant seamless pipeline tube and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |