CN114015939A - Anti-seismic steel bar and preparation method thereof - Google Patents
Anti-seismic steel bar and preparation method thereof Download PDFInfo
- Publication number
- CN114015939A CN114015939A CN202111273233.5A CN202111273233A CN114015939A CN 114015939 A CN114015939 A CN 114015939A CN 202111273233 A CN202111273233 A CN 202111273233A CN 114015939 A CN114015939 A CN 114015939A
- Authority
- CN
- China
- Prior art keywords
- equal
- percent
- steel bar
- less
- temperature
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 126
- 239000010959 steel Substances 0.000 title claims abstract description 126
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000009749 continuous casting Methods 0.000 claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 claims abstract description 27
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 10
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 37
- 230000008569 process Effects 0.000 claims description 29
- 238000007664 blowing Methods 0.000 claims description 23
- 238000007670 refining Methods 0.000 claims description 17
- 238000003723 Smelting Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 9
- 230000000295 complement effect Effects 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 16
- 229910052799 carbon Inorganic materials 0.000 abstract description 11
- 230000008520 organization Effects 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 description 17
- 239000011651 chromium Substances 0.000 description 13
- 239000011572 manganese Substances 0.000 description 12
- 229910001562 pearlite Inorganic materials 0.000 description 10
- 238000001556 precipitation Methods 0.000 description 8
- 229910001566 austenite Inorganic materials 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910000859 α-Fe Inorganic materials 0.000 description 7
- 230000001965 increasing effect Effects 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 4
- 229910001199 N alloy Inorganic materials 0.000 description 4
- 229910000720 Silicomanganese Inorganic materials 0.000 description 4
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
-
- 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
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to the technical field of ferrous metallurgy, in particular to an anti-seismic steel bar and a preparation method thereof, wherein the anti-seismic steel bar comprises the following chemical components in percentage by weight: c: 0.20 to 0.25%, Si: 0.65-0.80%, Mn: 1.35-1.60%, V: 0.090-0.110%, Cr: 0.20-0.30%, N: more than or equal to 0.0180 percent, less than or equal to 0.035 percent P, less than or equal to 0.035 percent S, less than or equal to 0.55 percent Ceq, and the balance of Fe and inevitable impurities. The beneficial influence of the specification effect of the small-specification HRB600E anti-seismic steel bar on the strength performance is fully considered, the C content is properly reduced and controlled to be 0.20-0.25%, and Ceq is less than or equal to 0.55%, so that the requirements of the C content and the carbon equivalent of the 500 MPa-grade steel bar in the GB/T1499.2-2018 standard are met, continuous casting judgment with the 500 MPa-grade steel bar can be realized in production organization, the production efficiency is not influenced, the production organization is convenient, and the judgment waste loss is reduced.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to an anti-seismic steel bar and a preparation method thereof.
Background
The newly revised and implemented standard GB/T1499.2-2018 of hot-rolled ribbed steel bars for reinforced concrete is used for promoting energy conservation and emission reduction and eliminating backward productivity, popularizing the use of high-strength steel bars and the material-saving technology, eliminating 335 MPa-grade steel bars and increasing 600 MPa-grade high-strength steel bars.
On the premise of increasing the building safety, the 600 MPa-level high-strength steel bar can obviously reduce the amount of steel for construction, and compared with HRB400 and HRB500 which are mainly used at present, the steel consumption is respectively saved by 44.4 percent and 19.5 percent, thereby being beneficial to promoting the reduction of Chinese steel and supporting the transformation and upgrading of the construction industry. The development and application of the 600 MPa-grade high-strength steel bar are important measures for building a resource-saving and environment-friendly society, and have important significance for promoting structure adjustment and transformation upgrading of the steel industry and the building industry.
At present, in the development of domestic HRB600E earthquake-resistant steel bars, the strength is improved by increasing the content of C in steel, improving the addition of microalloy elements and enhancing the effects of fine-grain strengthening and precipitation strengthening, and certain effect is achieved, but certain technical bottleneck exists, because the fine-grain strengthening can reduce the yield ratio of the steel bars, and the earthquake resistance is unfavorable. In particular, the HRB600E with small specification has the specification effects of large compression ratio, high rolling strain rate, high cooling speed and the like, a microstructure with fine grains is easier to obtain, the yield strength of the steel bar is obviously improved, the requirement on the seismic performance that the yield ratio is more than or equal to 1.25 is difficult to stably meet, and certain difficulty is brought in the production process.
In addition, with the increase of the C content and alloy elements in the HRB600E anti-seismic steel bar, the carbon equivalent is obviously improved, the requirements of the C content and the carbon equivalent of the steel bar with 400MPa and 500MPa in the GB/T1499.2-2018 standard cannot be met, continuous casting judgment is difficult to realize in the production process, single casting time or continuous casting furnace time waste judgment is required, and the production cost and the production organization difficulty are increased.
The microalloying technology obviously reduces the yield ratio of the small-specification HRB600E steel bars while improving the strength through fine grain strengthening and precipitation strengthening, increases the C content and the carbon equivalent, is difficult to meet the production organization requirement of continuous casting judgment with other grades of steel bars, and becomes a problem to be solved urgently in the production process of the small-specification HRB 600E.
Disclosure of Invention
The invention aims to overcome the problems, and one of the purposes of the invention is to overcome the problems that the C content and the carbon equivalent of the HRB600E anti-seismic steel bar are high, and continuous casting judgment of 400MPa and 500 MPa-level screw steel bar production organization is difficult to realize through chemical composition optimization; the second purpose is to weaken the adverse effect of the specification effects of large compression ratio, rolling strain rate, large cooling speed after rolling and the like of the small-specification HRB600E anti-seismic steel bar on the anti-seismic performance through the optimization design of alloy components and a rolling process. The small-size HRB600E anti-seismic steel bar with stable anti-seismic performance, convenient production organization and less loss and the preparation method thereof are provided. The yield strength ReL of the steel bar is more than or equal to 600MPa, the tensile strength Rm is more than or equal to 750MPa, the maximum force total elongation Agt is more than or equal to 9.0 percent, the yield ratio is more than or equal to 1.25, and the yield ratio is less than or equal to 1.30.
Through the beneficial effects, the problems that the small-specification HRB600E anti-seismic steel bar is difficult to be continuously cast with the 500 MPa-grade steel bar for judging and the yield ratio is low in production are successfully solved, the yield ratio of the small-specification (10-16 mm) HRB600E anti-seismic steel bar is more than or equal to 1.25, and the performance requirement of the anti-seismic steel bar is met.
The invention provides an anti-seismic steel bar, namely a small-size HRB600E anti-seismic steel bar, which comprises the following chemical components in percentage by weight:
c: 0.20 to 0.25%, Si: 0.65-0.80%, Mn: 1.35-1.60%, V: 0.090-0.110%, Cr: 0.20-0.30%, N: more than or equal to 0.0180 percent, less than or equal to 0.035 percent P, less than or equal to 0.035 percent S, less than or equal to 0.55 percent Ceq, and the balance of Fe and inevitable impurities.
Preferably, the V/N content in the anti-seismic steel bar is controlled to be 4-6: 1.
The invention also provides a preparation method of the anti-seismic reinforcing steel bar, which comprises the following steps:
1) the process flow for manufacturing the steel billet comprises the following steps: molten iron pretreatment → combined blown converter → LF refining, wherein the chemical components in the steel billet comprise, by weight percent, C: 0.20 to 0.25%, Si: 0.65-0.80%, Mn: 1.35-1.60%, V: 0.090-0.110%, Cr: 0.20-0.30%, N: more than or equal to 0.0180 percent, less than or equal to 0.035 percent P, less than or equal to 0.035 percent S, less than or equal to 0.55 percent Ceq, and the balance of Fe and inevitable impurities.
2) Continuous casting: the temperature of the tundish is controlled as follows: the continuous casting method comprises the following steps of (1) continuously casting a first furnace at 1535-1550 ℃ for 1520-1535 ℃ for a first time;
3) rolling: reheating the steel billet at the temperature of 1130-1230 ℃, wherein the heating time is more than 60min, the uniform heating temperature of the steel billet is ensured, and the temperature difference of the heating temperature of the steel billet is controlled within 30 ℃;
rolling the reheated billet, the rough rolling start rolling temperature: 1080-1150 ℃, finish rolling temperature: 1030-1080 ℃, weak water penetration after rolling, improvement of the surface quality of the steel bar, and 1000-1050 ℃ of temperature on a cooling bed.
Preferably, in the step 1), the converter smelting operation adopts high-tension complementary blowing, and the end point control target is as follows: [C] more than or equal to 0.12 percent, less than or equal to 0.035 percent of P percent and less than or equal to 0.030 percent of S percent.
Preferably, in the step 1), LF refining is performed, argon is blown at the bottom in the whole process and stirred, small-pressure soft blowing of 0.2-0.3 MPa is adopted before the product is discharged, and the refining soft argon blowing time is more than 10 min.
Preferably, the whole process of the continuous casting operation in the step 2) is protected for casting, and the drawing speed is controlled to be 2.2-2.5 m/min.
Preferably, the cross-sectional dimension of the continuous casting billet in the step 2) is 150mm × 150mm or 160mm × 160 mm. Compared with the prior art, the invention has the advantages that:
1. the beneficial influence of the specification effect of the small-specification HRB600E anti-seismic steel bar on the strength performance is fully considered, the C content is properly reduced and controlled to be 0.20-0.25%, and Ceq is less than or equal to 0.55%, so that the requirements of the C content and the carbon equivalent of the 500 MPa-grade steel bar in the GB/T1499.2-2018 standard are met, continuous casting judgment with the 500 MPa-grade steel bar can be realized in production organization, the production efficiency is not influenced, the production organization is convenient, and the judgment waste loss is reduced.
2. The content of V/N is controlled to be 4-6: 1 in an ideal ratio, V is fixed to N, and the N promotes V (C, N) to be precipitated, so that the comprehensive effects of precipitation strengthening and fine grain strengthening are fully exerted, the strength performance of the steel bar is obviously improved, the addition of V can be reduced, and alloy resources are saved.
3. A small amount of Cr is added, and years of research show that the CCT curve of the steel can move upwards and rightwards due to the addition of the Cr, the phase transition temperature interval of pearlite correspondingly decreases under the condition of constant cooling speed, and pearlite chips are refined along with the decrease of supercooling degree, so that the tensile strength is improved; in addition, the Cr element can also improve the solubility of V in austenite, reduce the temperature corresponding to the maximum precipitation amount of V (C, N), increase the solid solution strengthening effect of V, lighten the effects of V precipitation strengthening and fine grain strengthening, avoid the excessive refinement of steel grains, and greatly improve the tensile strength of the steel while improving the yield strength of the steel; in addition, the addition of a small amount of Cr slightly improves the hardenability of the steel bar, slightly improves the pearlite content of the steel bar, effectively improves the tensile strength, improves the yield ratio and improves the anti-seismic performance. Meanwhile, the phenomenon of coarsening of crystal grains caused by the waste heat after the steel bar is rolled is avoided, so that the performance of the steel bar is more stable, and the steel bar has extra contribution to the seismic performance of the steel bar.
4. The invention controls the mass percent of C to be 0.20-0.25%, Ceq is less than or equal to 0.55%, and the steel bar welding performance is good, thus being applicable to the existing steel bar welding connection process.
5. The higher heating temperature of the steel billet is beneficial to the dissolution of alloy elements and the homogenization of austenite components, promotes the proper growth of austenite grains and enhances the stability of an austenite structure; the water is weakly penetrated after rolling, the higher temperature of the upper cooling bed is controlled, the proper growth of recrystallized austenite is facilitated, the area of a crystal boundary is reduced, the nucleation points of ferrite are reduced, the proper coarsening of ferrite grains is facilitated, and the proportion of pearlite in the structure is increased. The coarsening of ferrite grains and the improvement of the proportion of hard phases such as pearlite have obvious effect on improving the tensile strength, are beneficial to improving the yield ratio and improving the anti-seismic performance.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The invention provides a small-size HRB600E anti-seismic steel bar which comprises the following chemical components in percentage by weight:
c: 0.20 to 0.25%, Si: 0.65-0.80%, Mn: 1.35-1.60%, V: 0.090-0.110%, Cr: 0.20-0.30%, N: more than or equal to 0.0180 percent, less than or equal to 0.035 percent P, less than or equal to 0.035 percent S, less than or equal to 0.55 percent Ceq, and the balance of Fe and inevitable impurities.
The influence of chemical components on the performance of the steel bar is as follows:
c: c is one of the most effective strengthening elements and the cheapest chemical element, the increment ratio of the tensile strength to the yield strength is about 2:1, and the yield ratio can be obviously improved. However, too high C content may reduce the plasticity and toughness of the steel bar and deteriorate the weldability. Meanwhile, continuous casting judgment with 500 MPa-grade steel bars is considered to be achieved, organization and production are facilitated, production loss is reduced, and the content of C is controlled to be 0.20-0.25%.
Si: si is a non-carbide forming element, and closes a gamma region in steel, so that the Ac3 point can be increased, and ferrite and pearlite can be promoted to form. The solid solution in ferrite can simultaneously improve the tensile strength and the yield strength, improve the elastic limit more and does not reduce the yield ratio, so the Si element is designed and controlled at a higher level of 0.65-0.80%.
Mn: mn exists mainly as a solid solution in steel, and has a strong solid solution strengthening effect. In ferrite-pearlite steel, Mn can increase pearlite content, reduce the formation temperature of pearlite, refine pearlite interlayer spacing, and significantly improve the tensile strength and the yield ratio of the steel, so that the Mn content is controlled at a higher level of 1.35-1.60%.
V: for high-strength weldable long sections, V is the most important microalloy strengthening element, is precipitated in a V (C, N) form in the rolling process, can effectively prevent the growth of austenite and ferrite grains, improves the precipitation strengthening and fine grain strengthening effects, and can obviously improve the strength performance of the steel bar. Meanwhile, the beneficial influence of the specification effect on the strength performance of the small-specification reinforcing steel bar is considered, the content of V in the steel can be properly reduced, expensive alloy resources are saved, and the content of V is controlled to be 0.090-0.110%.
N: in V microalloyed steel, with the increase of N content, the solubility of V in austenite and ferrite is reduced, the precipitation of V (C, N) is promoted in the rolling process, the precipitation strengthening and fine-grain strengthening effects of V can be fully exerted, and the V microalloyed steel has obvious effects of improving the strength of a steel bar and reducing the addition of V, so that the V microalloyed steel has the following advantages that the V/N4-6: 1, and controlling the content of N to be more than or equal to 0.018 percent.
S: sulfur is an impurity element, and exists mainly in manganese sulfide inclusion in steel, and the inclusion is rolled and then plastically deformed along with a steel matrix to form a strip shape, so that the mechanical property of the steel is adversely affected, but the sulfur content of S is controlled to be less than or equal to 0.035 percent by comprehensively considering the desulfurization cost
P: phosphorus is a harmful element. The P content is too high, the segregation is easy to occur on the grain boundary, and the toughness and plasticity of the steel are reduced, but in consideration of the dephosphorization cost, the P content is less than or equal to 0.035 percent
The invention provides a method for manufacturing a small-size HRB600E anti-seismic steel bar, which comprises the following steps:
1) the process flow for manufacturing the steel billet comprises the following steps: molten iron pretreatment → combined blown converter → LF refining → billet continuous casting. The chemical components in the steel billet comprise, by weight percent,
C:0.20～0.25％，Si：0.65～0.80％，Mn:1.35～1.60％，V：0.090～0.110％，Cr：0.20～0.30％，N≥0.018％，P≤0.035％，S≤0.035％％，Ceq≤0.55％。
converter smelting operation, adopting high-tension complementary blowing, and controlling a target at a terminal: [C] more than or equal to 0.12 percent, less than or equal to 0.035 percent of P percent and less than or equal to 0.030 percent of S percent.
LF refining operation, bottom blowing argon stirring in the whole process, soft blowing under small pressure before leaving the station, ensuring impurities to float upwards, and refining soft argon blowing time being more than 10 min.
The whole process of the continuous casting operation process protects casting, and the tundish temperature is controlled as follows: the continuous casting first furnace is 1535-1550 ℃ and the continuous casting time is 1520-1535 ℃. Keeping a stable drawing speed, wherein the drawing speed is controlled to be 2.2-2.5 m/min, and the section size of the continuous casting square billet is 150mm multiplied by 150 mm.
2) Reheating the steel billet at the temperature of 1130-1230 ℃, wherein the specific requirements of the heating system of the billet fed into the furnace are shown in table 1.
TABLE 1 Square billet heating System
3) Rolling the reheated billet, wherein the rough rolling starting temperature is as follows: 1080-1150 ℃, finish rolling temperature: 1030-1080 ℃, weakly penetrating water after rolling, improving the surface quality of the steel bar, and feeding the steel bar onto a cooling bed at the temperature of 1000-1050 ℃;
example 1
The invention provides production of a small-size HRB600E anti-seismic steel bar, which comprises the following procedures of combined blown converter smelting, LF refining, continuous casting and rolling. Wherein:
in the smelting process of the converter, when the molten steel is discharged to one fourth, silicomanganese, ferrosilicon, high-chromium iron and vanadium-nitrogen alloy are sequentially added, and when the molten steel is discharged to three fourths, the molten steel is added. High-tension complementary blowing is adopted in the smelting process, the end points [ C ] are controlled to be 0.14%, the end points [ P ] are controlled to be 0.025%, and the end points [ S ] are controlled to be 0.011%, and the chemical components of molten steel in the process are controlled as follows: c: 0.23%, Si: 0.68%, Mn: 1.43%, V: 0.096%, Cr: 0.22%, N: 0.0206%, P: 0.025%, S: 0.011%, Ceq: 0.53%, and the balance of Fe and inevitable impurities;
in the LF refining process: after the component temperature is proper, the soft blowing operation is carried out, and the soft blowing time is 10.5 min.
In the continuous casting process: the average value of the temperature of the tundish is 1525 ℃, and the average pulling speed is 2.3 m/min;
in the rolling process: heating the square billet to 1160 ℃, rolling at 1080 ℃, finishing at 1030 ℃, weakly penetrating water after rolling to improve the surface quality of the steel bar, feeding the steel bar onto a cooling bed at 1006 ℃, and cooling the steel bar to room temperature. Thus obtaining the small-specification HRB600E anti-seismic steel bar containing the components in the table 1, and the specific performance parameters are shown in the table 2.
Example 2
The invention provides production of a small-size HRB600E anti-seismic steel bar, which comprises the following procedures of combined blown converter smelting, LF refining, continuous casting and rolling. Wherein:
in the smelting process of the converter, when the molten steel is discharged to one fourth, silicomanganese, ferrosilicon, high-chromium iron and vanadium-nitrogen alloy are sequentially added, and when the molten steel is discharged to three fourths, the molten steel is added. High-tension complementary blowing is adopted in the smelting process, the end points [ C ] are controlled to be 0.12%, the end points [ P ] are controlled to be 0.019%, the end points [ S ] are controlled to be 0.013%, and the chemical components of molten steel in the working procedure are controlled as follows: c: 0.24%, Si: 0.70%, Mn: 1.38%, V: 0.100%, Cr: 0.24%, N: 0.022%, P: 0.019%, S: 0.013%, Ceq: 0.54%, and the balance of Fe and inevitable impurities;
in the LF refining process: after the component temperature is proper, the soft blowing operation is carried out, and the soft blowing time is 11 min.
In the continuous casting process: the average value of the temperature of the tundish is 1523 ℃, and the average pulling speed is 2.35 m/min;
in the rolling process: heating the square billet to 1170 ℃, wherein the initial rolling temperature is 1085 ℃, the finish rolling temperature is 1040 ℃, weakly penetrating water after rolling, improving the surface quality of the steel bar, feeding the steel bar onto a cooling bed at 1010 ℃, and cooling the steel bar to room temperature. Thus obtaining the small-specification HRB600E anti-seismic steel bar containing the components in the table 1, and the specific performance parameters are shown in the table 2.
Example 3
The invention provides production of a small-size HRB600E anti-seismic steel bar, which comprises the following procedures of combined blown converter smelting, LF refining, continuous casting and rolling. Wherein:
in the smelting process of the converter, when the molten steel is discharged to one fourth, silicomanganese, ferrosilicon, high-chromium iron and vanadium-nitrogen alloy are sequentially added, and when the molten steel is discharged to three fourths, the molten steel is added. High-tension complementary blowing is adopted in the smelting process, the end points [ C ] are controlled to be 0.12%, the end points [ P ] are controlled to be 0.020%, the end points [ S ] are controlled to be 0.010%, and the chemical components of molten steel in the process are controlled as follows: c: 0.24%, Si: 0.75%, Mn: 1.40%, V: 0.103%, Cr: 0.26%, N: 0.021%, P: 0.020%, S: 0.010%, Ceq: 0.55%, the balance being Fe and inevitable impurities;
in the LF refining process: after the component temperature is proper, the soft blowing operation is carried out, and the soft blowing time is 10 min.
In the continuous casting process: the average value of the temperature of the tundish is 1523 ℃, and the average pulling speed is 2.3 m/min;
in the rolling process: heating the square billet to 1180 ℃, rolling at 1100 ℃ and finishing at 1050 ℃, weakly penetrating water after rolling to improve the surface quality of the steel bar, feeding the steel bar onto a cooling bed at 1026 ℃, and air-cooling the steel bar to room temperature. Thus obtaining the small-specification HRB600E anti-seismic steel bar containing the components in the table 1, and the specific performance parameters are shown in the table 2.
Example 4
The invention provides production of a small-size HRB600E anti-seismic steel bar, which comprises the following procedures of combined blown converter smelting, LF refining, continuous casting and rolling. Wherein:
in the smelting process of the converter, when the molten steel is discharged to one fourth, silicomanganese, ferrosilicon, high-chromium iron and vanadium-nitrogen alloy are sequentially added, and when the molten steel is discharged to three fourths, the molten steel is added. High-tension complementary blowing is adopted in the smelting process, the end points [ C ] are controlled to be 0.14%, the end points [ P ] are controlled to be 0.024%, and the end points [ S ] are controlled to be 0.011%, and the chemical components of molten steel in the process are controlled as follows: c: 0.25%, Si: 0.75%, Mn: 1.40%, V: 0.106%, Cr: 0.24%, N: 0.0212%, P: 0.024%, S: 0.011%, Ceq: 0.55%, the balance being Fe and inevitable impurities;
in the LF refining process: after the component temperature is proper, the soft blowing operation is carried out, and the soft blowing time is 10.5 min.
In the continuous casting process: the average value of the temperature of the tundish is 1530 ℃, and the average pulling speed is 2.45 m/min;
in the rolling process: heating the square billet to 1210 ℃, the initial rolling temperature is 1130 ℃, the finish rolling temperature is 1060 ℃, weakly penetrating water after rolling to improve the surface quality of the steel bar, and the temperature of an upper cooling bed is 1035 ℃, and air cooling to room temperature. Thus obtaining the small-specification HRB600E anti-seismic steel bar containing the components in the table 1, and the specific performance parameters are shown in the table 2.
The concrete performance parameters of the small-specification HRB600E anti-seismic steel bars with the components in the table 1 are shown in the table 2.
The performance parameters of the bars prepared in examples 1-4 of Table 2 were measured as follows: the steel strength performance parameters in table 2 are determined based on the standard GB/T28900-2012 "steel test method for reinforced concrete.
Table 1 small-sized HRB600E earthquake-resistant reinforcing steel bar having a part of component contents (mass%)
| Examples | C | Si | Mn | V | Cr | P | S | Ceq |
| 1 | 0.23 | 0.68 | 1.43 | 0.096 | 0.22 | 0.025 | 0.011 | 0.53 |
| 2 | 0.24 | 0.70 | 1.38 | 0.100 | 0.24 | 0.019 | 0.013 | 0.54 |
| 3 | 0.24 | 0.75 | 1.40 | 0.103 | 0.26 | 0.020 | 0.010 | 0.55 |
| 4 | 0.25 | 0.75 | 1.40 | 0.106 | 0.24 | 0.024 | 0.011 | 0.55 |
TABLE 2 mechanical performance index of small-sized HRB600E earthquake-resistant steel bar
Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The anti-seismic steel bar is characterized by comprising the following chemical components in percentage by weight: c: 0.20 to 0.25%, Si: 0.65-0.80%, Mn: 1.35-1.60%, V: 0.090-0.110%, Cr: 0.20-0.30%, N: more than or equal to 0.0180 percent, less than or equal to 0.035 percent P, less than or equal to 0.035 percent S, less than or equal to 0.55 percent Ceq, and the balance of Fe and inevitable impurities.
2. An anti-seismic steel bar according to claim 1, wherein the yield strength ReL of the anti-seismic steel bar is more than or equal to 600MPa, the tensile strength Rm is more than or equal to 750MPa, the maximum force total elongation Agt is more than or equal to 9.0%, the yield ratio is more than or equal to 1.25, and the yield ratio is less than or equal to 1.30.
3. An anti-seismic steel bar according to claim 1, wherein the V/N content in the anti-seismic steel bar is controlled to be 4-6: 1.
4. A method of manufacturing an anti-seismic reinforcing bar as claimed in any one of claims 1 to 3, comprising the steps of:
1) pretreating molten iron, blowing a converter again and refining LF;
2) continuous casting: the temperature of the tundish is controlled as follows: the continuous casting method comprises the following steps of (1) continuously casting a first furnace at 1535-1550 ℃ for 1520-1535 ℃ for a first time;
3) rolling: reheating the billet at the temperature of 1130-1230 ℃, wherein the heating time is more than 60min, rolling the reheated billet, and the rough rolling starting temperature is as follows: 1080-1150 ℃, finish rolling temperature: 1030-1080 ℃, and the temperature of the upper cooling bed is 1000-1050 ℃.
5. The preparation method according to claim 4, wherein the converter smelting operation in the step 1) adopts high-tension complementary blowing, and the end point control target is as follows: [C] more than or equal to 0.12 percent, less than or equal to 0.035 percent of P percent and less than or equal to 0.030 percent of S percent.
6. The preparation method of claim 4, wherein in the step 1), LF refining is performed, argon is blown to stir at the bottom in the whole process, soft blowing is performed under a small pressure of 0.2MPa to 0.3MPa before the LF is taken out of a station, and the refining soft argon blowing time is more than 10 min.
7. The preparation method according to claim 4, wherein the casting is protected in the whole process of the continuous casting operation in the step 2), and the drawing speed is controlled to be 2.2-2.5 m/min.
8. The manufacturing method according to claim 4, wherein the cross-sectional size of the continuous casting billet in the step 2) is 150mm x 150mm or 160mm x 160 mm.
9. The manufacturing method according to claim 4, wherein the temperature difference of the heating temperature of the steel blank in the step 3) is controlled within 30 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111273233.5A CN114015939A (en) | 2021-10-29 | 2021-10-29 | Anti-seismic steel bar and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111273233.5A CN114015939A (en) | 2021-10-29 | 2021-10-29 | Anti-seismic steel bar and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114015939A true CN114015939A (en) | 2022-02-08 |
Family
ID=80058929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111273233.5A Pending CN114015939A (en) | 2021-10-29 | 2021-10-29 | Anti-seismic steel bar and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114015939A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114990429A (en) * | 2022-05-07 | 2022-09-02 | 本钢板材股份有限公司 | High-strength anti-seismic steel bar HRB600E and production method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09111340A (en) * | 1995-08-11 | 1997-04-28 | Sumitomo Metal Ind Ltd | High strength and low yield ratio steel for reinforcing bar and its production |
| CN102732787A (en) * | 2012-07-20 | 2012-10-17 | 江苏省沙钢钢铁研究院有限公司 | 600MPa level quake-proof twisted steel and manufacturing method thereof |
| CN102851580A (en) * | 2012-09-29 | 2013-01-02 | 莱芜钢铁集团有限公司 | HRB600E aseismic reinforcement steel bar and production method thereof |
| CN103469117A (en) * | 2013-08-12 | 2013-12-25 | 武汉钢铁(集团)公司 | Hot-rolled ribbed steel bar having strength-to-yield ratio of 1.25 or more, and production method thereof |
| CN107747061A (en) * | 2017-09-14 | 2018-03-02 | 河钢股份有限公司 | A kind of 630MPa levels high-strength tenacity hot rolled ribbed bars and its production method |
| CN111270127A (en) * | 2018-12-04 | 2020-06-12 | 魏滔锴 | Steel for 635MPa grade high-strength hot-rolled steel bar |
| CN113462965A (en) * | 2021-06-18 | 2021-10-01 | 马鞍山钢铁股份有限公司 | Steel for rolling 635 MPa-grade high-strength anti-seismic reinforcing steel bar in two-phase region and production method thereof |
-
2021
- 2021-10-29 CN CN202111273233.5A patent/CN114015939A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09111340A (en) * | 1995-08-11 | 1997-04-28 | Sumitomo Metal Ind Ltd | High strength and low yield ratio steel for reinforcing bar and its production |
| CN102732787A (en) * | 2012-07-20 | 2012-10-17 | 江苏省沙钢钢铁研究院有限公司 | 600MPa level quake-proof twisted steel and manufacturing method thereof |
| CN102851580A (en) * | 2012-09-29 | 2013-01-02 | 莱芜钢铁集团有限公司 | HRB600E aseismic reinforcement steel bar and production method thereof |
| CN103469117A (en) * | 2013-08-12 | 2013-12-25 | 武汉钢铁(集团)公司 | Hot-rolled ribbed steel bar having strength-to-yield ratio of 1.25 or more, and production method thereof |
| CN107747061A (en) * | 2017-09-14 | 2018-03-02 | 河钢股份有限公司 | A kind of 630MPa levels high-strength tenacity hot rolled ribbed bars and its production method |
| CN111270127A (en) * | 2018-12-04 | 2020-06-12 | 魏滔锴 | Steel for 635MPa grade high-strength hot-rolled steel bar |
| CN113462965A (en) * | 2021-06-18 | 2021-10-01 | 马鞍山钢铁股份有限公司 | Steel for rolling 635 MPa-grade high-strength anti-seismic reinforcing steel bar in two-phase region and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 白天平: "500MPa级高强抗震钢筋抗震性能研究", 《科技风》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114990429A (en) * | 2022-05-07 | 2022-09-02 | 本钢板材股份有限公司 | High-strength anti-seismic steel bar HRB600E and production method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110042303B (en) | 400 MPa-level fine-grain hot-rolled steel bar and production process thereof | |
| CN102383033B (en) | 600-MPa grade vanadium-containing high-strength hot-rolled steel bar and production method thereof | |
| CN109943778B (en) | 590 MPa-grade cold-rolled dual-phase steel with excellent hole expansion performance and production method thereof | |
| CN107557678B (en) | Inexpensive 550MPa grades of hot rolling container weathering steel and its manufacturing method | |
| CN111748741B (en) | Thick pipeline steel and low compression ratio production process thereof | |
| CN102703813B (en) | Vanadium and titanium compound microalloyed steel bar and production method thereof | |
| CN109930056B (en) | 400 MPa-level fine-grain twisted steel and manufacturing method thereof | |
| CN111187990B (en) | Hot-rolled H-shaped steel with yield strength of 500MPa and production method thereof | |
| CN109972035B (en) | 800 MPa-level hot-rolled twisted steel and production method thereof | |
| CN109957712A (en) | A kind of soft X70M line steel hot rolling coiled sheet and its manufacturing method | |
| CN103774039B (en) | A kind of hot-rolled plate coil for welded gas cylinder manufacturing process | |
| CN112011737B (en) | 390 MPa-grade-20-DEG C-resistant hot-rolled angle steel for bridge structure and production method thereof | |
| CN110079728B (en) | High-strength twisted steel with good weldability and manufacturing method thereof | |
| CN111455278A (en) | Thick hot-rolled high-strength steel plate coil with excellent low-temperature toughness and for 800MPa cold forming and manufacturing method thereof | |
| CN110144522B (en) | Oxide fine-grain type twisted steel and production process thereof | |
| CN109385576A (en) | A kind of inexpensive X65 pipe line steel and its manufacturing method based on magnesium processing | |
| CN105925899A (en) | Quenched and tempered X52 hydrogen sulfide corrosion resisting seamless line pipe and preparation method thereof | |
| CN111172459A (en) | HRB600E vanadium-titanium microalloyed high-strength anti-seismic hot-rolled steel bar | |
| CN103643120B (en) | The manufacture method of high tenacity welded gas cylinder steel hot-rolled sheet coil | |
| WO2023000479A1 (en) | Hot-rolled, low-temperature-resistant, h-shaped steel with grade of yield strength of 420 mpa, and preparation method therefor | |
| CN111607750A (en) | X90-grade high-strength pipeline steel plate coil with thickness of more than or equal to 20mm and manufacturing method thereof | |
| CN109957714A (en) | The pipeline steel and its manufacturing method of intensity and excellent in low temperature toughness | |
| CN111926253A (en) | Hydrogen sulfide corrosion resistant high-strength toughness normalized steel and manufacturing method thereof | |
| CN115584441A (en) | Hot-rolled coil for hydrogen transmission pipeline with 245 MPa-level yield strength and production method thereof | |
| CN111155022B (en) | 390 MPa-grade polar region hull structural steel with low-temperature toughness and preparation 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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220208 |
|
| RJ01 | Rejection of invention patent application after publication |