CN119076609A - A rolling process for chloride ion corrosion resistant steel bars for 500 MPa reinforced concrete - Google Patents
A rolling process for chloride ion corrosion resistant steel bars for 500 MPa reinforced concrete Download PDFInfo
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- CN119076609A CN119076609A CN202411192051.9A CN202411192051A CN119076609A CN 119076609 A CN119076609 A CN 119076609A CN 202411192051 A CN202411192051 A CN 202411192051A CN 119076609 A CN119076609 A CN 119076609A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 153
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 30
- 239000010935 stainless steel Substances 0.000 title claims abstract description 30
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 238000009749 continuous casting Methods 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 17
- 238000005260 corrosion Methods 0.000 abstract description 17
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 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
- 238000011161 development Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/005—Continuous casting of metals, i.e. casting in indefinite lengths of wire
-
- 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
-
- 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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/04—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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials 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
本发明属于耐腐蚀钢筋制备技术领域，具体涉及一种500兆帕级钢筋混凝土用耐氯离子腐蚀钢筋的轧制工艺。本发明提供的轧制工艺，包括如下步骤：对冶炼后的钢水进行连铸，得到连铸坯，以重量百分比计，所述连铸坯的组分为C：0.08‑0.09％，Cr：1.00‑1.02％，Cu：0.20‑0.22％，Mo：0.20‑0.22％，Si：0.24‑0.28％，Mn：0.4‑0.42％，V：0.03‑0.035％，N：0.04‑0.045％，P:≤0.02％，S:≤0.01％，其余为铁及不可避免的杂质；连铸坯进行加热，对加热后的连铸坯依次进行粗轧和精轧，精轧之后降温冷却，得到耐氯离子腐蚀钢筋；粗轧轧制道次5‑7次，第一道次压下率10‑15％，最后一道次压下率10‑15％，中间道次压下率25‑30％。本发明提供的轧制工艺实现了高强度的同时还具有优异的耐氯离子腐蚀性能。The invention belongs to the technical field of corrosion-resistant steel bar preparation, and specifically relates to a rolling process of chloride ion corrosion-resistant steel bars for 500 MPa grade reinforced concrete. The rolling process provided by the present invention comprises the following steps: continuously casting smelted molten steel to obtain a continuous casting billet, wherein the components of the continuous casting billet are C: 0.08-0.09%, Cr: 1.00-1.02%, Cu: 0.20-0.22%, Mo: 0.20-0.22%, Si: 0.24-0.28%, Mn: 0.4-0.42%, V: 0.03-0.035%, N: 0.04-0.045%, P: ≤0.02%, S: ≤0.01%, and the rest are iron and inevitable impurities; heating the continuous casting billet, sequentially performing rough rolling and finish rolling on the heated continuous casting billet, cooling after the finish rolling to obtain a chloride ion corrosion resistant steel bar; and performing 5-7 rough rolling passes, with a first pass reduction rate of 10-15%, a last pass reduction rate of 10-15%, and an intermediate pass reduction rate of 25-30%. The rolling process provided by the invention achieves high strength and also has excellent chloride ion corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of corrosion-resistant steel bar preparation, and particularly relates to a rolling process of a chloride ion corrosion-resistant steel bar for 500 megapascal reinforced concrete.
Background
The concrete reinforcing steel bar is taken as an important reinforcing steel bar material, is widely applied to the fields of construction, industry and the like, with the development of society and the progress of technology, people gradually go deep into the ocean by exploring steps to better utilize ocean resources, and the special high-salt and high-humidity environment in the ocean environment provides higher challenges for the concrete reinforcing steel bar, and the reinforcing steel bar is required to have excellent corrosion resistance, in particular to have chloride ion corrosion resistance.
At present, two methods for improving the corrosion performance of the steel bar are mainly adopted, one method is to coat a corrosion-resistant layer on the surface of the steel bar, and the other method is to add alloy elements into the steel bar to fundamentally improve the corrosion resistance of the steel bar. The current corrosion-resistant steel bars mainly comprise stainless steel bars, galvanized steel bars and alloy corrosion-resistant steel bars. The corrosion-resistant alloy steel bar is generally prepared by adding elements such as Ni, cr, mo and the like into the steel bar to improve the corrosion resistance of the steel bar, however, although the addition of the alloy elements can improve the corrosion resistance of the steel bar, the mechanical properties of the steel bar can be damaged, so that the mechanical properties and the corrosion resistance of the steel bar are both challenged.
Disclosure of Invention
Therefore, the invention aims to overcome the defect that the existing alloy corrosion-resistant steel bar cannot effectively consider the mechanical property and corrosion resistance of the steel bar, and further provides a rolling process of the chloride ion corrosion-resistant steel bar for 500 megapascal reinforced concrete. According to the invention, through the optimized selection of alloy elements and the cooperation of the dosage control and the rolling process, the production of the 500 megapascal-grade steel bar is realized, and the steel bar has excellent corrosion resistance.
In order to solve the problems, the scheme of the invention is as follows:
A rolling process of a chlorine ion corrosion resistant steel bar for 500 megapascal reinforced concrete comprises the following steps:
1) Continuously casting the smelted molten steel to obtain a continuous casting blank, wherein the components of the continuous casting blank are C：0.08-0.09％,Cr：1.00-1.02％,Cu：0.20-0.22％,Mo：0.20-0.22％,Si：0.24-0.28％,Mn：0.4-0.42％,V：0.03-0.035％,N：0.04-0.045％,P:≤0.02％,S:≤0.01％, weight percent of iron and unavoidable impurities, and N=0.05Mo+V;
2) Heating the continuous casting blank, sequentially performing rough rolling and finish rolling on the heated continuous casting blank, and cooling after finish rolling to obtain the chloride ion corrosion resistant steel bar;
in the rough rolling process, rough rolling is carried out for 5-7 times, the first pass reduction rate is 10-15%, the last pass reduction rate is 10-15%, and the intermediate pass reduction rate is 25-30%.
It will be appreciated that n=0.05mo+v, the meaning of this formula is that the N content is equal to 0.05 times the Mo content plus the V content.
Preferably, the continuous casting slab is heated at a temperature of 1140-1165 ℃.
Preferably, the rough rolling start temperature is 1130-1140 ℃ and the finish rolling temperature is 1040-1050 ℃.
Preferably, the finish rolling start temperature is 960-980 ℃ and the finish rolling temperature is 820-860 ℃.
Preferably, the rough rolling is carried out 5 times in the rough rolling process, the first pass rolling reduction is 10-15%, the second pass rolling reduction is 25-30%, the third pass rolling reduction is 25-30%, the fourth pass rolling reduction is 25-30%, and the fifth pass rolling reduction is 10-15%.
Preferably, the rough rolling is performed 6 times in the rough rolling process, the first pass rolling reduction is 10-15%, the second pass rolling reduction is 25-30%, the third pass rolling reduction is 25-30%, the fourth pass rolling reduction is 25-30%, the fifth rolling reduction is 25-30%, and the sixth rolling reduction is 10-15%.
Preferably, the rough rolling is performed 7 times in the rough rolling process, the first pass rolling reduction is 10-15%, the second pass rolling reduction is 25-30%, the third pass rolling reduction is 25-30%, the fourth pass rolling reduction is 25-30%, the fifth rolling reduction is 25-30%, the sixth rolling reduction is 25-30%, and the seventh rolling reduction is 10-15%.
Preferably, the first pass reduction is the same as the last pass reduction during rough rolling.
Preferably, after finish rolling, the temperature is reduced to 640-660 ℃ and then cooled to room temperature. Further preferably, after finish rolling, it is mist-cooled to 640-660 ℃ and then air-cooled to room temperature.
Preferably, the molten steel smelting process in the invention is a conventional process in the art, for example, molten iron is obtained after pre-desulfurization, converter smelting and LF external refining.
The technical scheme of the invention has the following advantages:
The rolling process of the chloride ion corrosion resistant steel bar for 500 megapascal reinforced concrete introduces C, cr, cu, mo, si, mn, V, N elements into the steel bar, wherein the addition of Cr, cu and Mo elements can effectively improve the corrosion resistance of the steel bar, however, the addition of Mo elements can influence the mechanical property of the steel bar to a certain extent, therefore, the invention adds V and N with specific contents, in the rolling process, through controlling the pass in the rough rolling process and the pressing rate of each pass, VN, (MoV) C and (MoV) N are induced and separated out through uniform deformation in the process of transforming the reinforcing steel bar from austenite to ferrite, the separated out fine particles further block the growth of ferrite grains, the strength and toughness of the reinforcing steel bar are further effectively improved, and the reinforcing steel bar has excellent chloride ion corrosion resistance while achieving 500 megapascal-level high strength.
According to the invention, in the aspect of element design, the contents of Mo, N and V are controlled to be consistent with N=0.05Mo+V, and the content of N is increased while high-content Mo is introduced, so that more VN, (MoV) C, (MoV) N, VN, (MoV) C and (MoV) N are formed in the deformation-induced precipitation process of the steel bar, the uniform precipitation of the steel bar further influences the size of ferrite grains, further the function of fine grain strengthening is achieved, and the mechanical property of the steel bar is effectively improved while the chloride ion corrosion resistance of the steel bar is improved.
According to the invention, the rolling pass is controlled to be 5-7 times in the rough rolling process, the rolling reduction rate of the first pass and the last pass is controlled to be lower than that of the intermediate pass, the high rolling reduction rate of the intermediate pass is kept on the basis, uniform precipitation of Mo, N, V and other particles can be ensured through a specific rough rolling step, and the chloride ion corrosion resistance and the mechanical property of the steel bar are simultaneously improved by matching with specific element content.
Detailed Description
The following examples are provided for further understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention.
The experimental procedures and conditions not specified in the following embodiments of the present invention may be carried out according to conventional experimental procedures and conditions adopted in the prior art documents. The reagents or apparatus employed are not known to the manufacturer and are conventional reagents or apparatus commercially available.
Example 1
The embodiment provides a rolling process of a chloride ion corrosion resistant steel bar for 500 megapascal reinforced concrete, which comprises the following steps:
1) Continuously casting the smelted molten steel to obtain a continuous casting blank, wherein the continuous casting blank comprises, by weight, 0.08% of C, 1.02% of Cr, 0.20% of Cu, 0.20% of Mo, 0.28% of Si, 0.42% of Mn, 0.03% of V, 0.04% of N, 0.02% of P, 0.01% of S, and the balance of iron and unavoidable impurities;
2) The method comprises the steps of heating a continuous casting blank to 1150 ℃, sequentially performing rough rolling and finish rolling on the heated continuous casting blank, wherein the rough rolling start temperature is 1130 ℃, the finish rolling temperature is 1050 ℃, rolling passes are 5 times, the first pass reduction rate is 10%, the second pass reduction rate is 25%, the third pass reduction rate is 25%, the fourth pass reduction rate is 25%, the fifth pass reduction rate is 10%, the finish rolling start temperature is 980 ℃, and the finish rolling temperature is 860 ℃, and after finish rolling, performing mist cooling to 650 ℃, and finally performing air cooling to room temperature to obtain the chloride ion corrosion resistant steel bar (with the specification phi of 14 mm) for 500 megapascal reinforced concrete.
Example 2
The embodiment provides a rolling process of a chloride ion corrosion resistant steel bar for 500 megapascal reinforced concrete, which comprises the following steps:
1) Continuously casting the smelted molten steel to obtain a continuous casting blank, wherein the continuous casting blank comprises, by weight, 0.09% of C, 1.01% of Cr, 0.22% of Cu, 0.2% of Mo, 0.24% of Si, 0.40% of Mn, 0.032% of V, 0.042% of N, 0.015% of P, 0.009% of S, and the balance of iron and unavoidable impurities;
2) The method comprises the steps of heating a continuous casting blank at 1160 ℃, sequentially performing rough rolling and finish rolling on the heated continuous casting blank, wherein the initial rolling temperature of rough rolling is 1135 ℃, the final rolling temperature is 1050 ℃, rolling passes are 5 times, the first pass rolling reduction rate is 15%, the second pass rolling reduction rate is 30%, the third pass rolling reduction rate is 30%, the fourth pass rolling reduction rate is 30%, the fifth pass rolling reduction rate is 15%, the initial rolling temperature of finish rolling is 980 ℃, the final rolling temperature is 860 ℃, and the final rolling is performed to 650 ℃, and finally air cooling is performed to room temperature to obtain the chloride ion corrosion resistant steel bar (with the specification phi of 14 mm) for 500 megapascal reinforced concrete.
Example 3
The embodiment provides a rolling process of a chloride ion corrosion resistant steel bar for 500 megapascal reinforced concrete, which is different from embodiment 2 in that in step 2), continuous casting billet heating temperature 1165 ℃, rough rolling and finish rolling are sequentially carried out on the heated continuous casting billet, rough rolling start rolling temperature 1135 ℃, finish rolling temperature 1045 ℃, rolling pass 6 times, first pass rolling reduction rate 12%, second pass rolling reduction rate 30%, third pass rolling reduction rate 30%, fourth pass rolling reduction rate 30%, fifth pass rolling reduction rate 30%, sixth pass rolling reduction rate 12%, finish rolling start rolling temperature 980 ℃ and finish rolling temperature 850 ℃, fog cooling is carried out to 640 ℃, and finally air cooling is carried out to room temperature, so that the chloride ion corrosion resistant steel bar (specification phi 14 mm) for 500 megapascal reinforced concrete is obtained.
Example 4
The embodiment provides a rolling process of a chloride ion corrosion resistant steel bar for 500 megapascal reinforced concrete, which is different from embodiment 2 in that in step 2), continuous casting billet heating temperature is 1155 ℃, rough rolling and finish rolling are sequentially carried out on the heated continuous casting billet, rough rolling start rolling temperature is 1140 ℃, finish rolling temperature is 1040 ℃, rolling passes are 7 times, first pass rolling reduction rate is 15%, second pass rolling reduction rate is 30%, third pass rolling reduction rate is 30%, fourth pass rolling reduction rate is 30%, fifth pass rolling reduction rate is 30%, sixth pass rolling reduction rate is 30%, seventh pass rolling reduction rate is 15%, finish rolling start rolling temperature is 960 ℃, finish rolling temperature is 820 ℃, fog cooling is carried out to 660 ℃, and finally air cooling is carried out to room temperature, so that the chloride ion corrosion resistant steel bar (specification phi 14 mm) for 500 megapascal reinforced concrete is obtained.
Comparative example 1
This comparative example provides a rolling process of a chloride ion corrosion resistant steel bar for reinforced concrete, which is different from example 1 in that the N content in the continuous casting billet in step 1) is 0.02%.
Comparative example 2
The comparative example provides a rolling process of a chloride ion corrosion resistant steel bar for reinforced concrete, which is different from example 1 in that the rough rolling temperature in the rough rolling step in step 2) is 1130 ℃, the finish rolling temperature is 1050 ℃, the rolling passes are 5 times, the first pass reduction rate is 25%, the second pass reduction rate is 25%, the third pass reduction rate is 25%, the fourth pass reduction rate is 25%, and the fifth pass reduction rate is 25%.
Comparative example 3
The comparative example provides a rolling process of a chloride ion corrosion resistant steel bar for reinforced concrete, which is different from example 1 in that the rough rolling temperature in the rough rolling step in step 2) is 1130 ℃, the finish rolling temperature is 1050 ℃, the rolling passes are 5 times, the first pass reduction rate is 25%, the second pass reduction rate is 25%, the third pass reduction rate is 25%, the fourth pass reduction rate is 25%, and the fifth pass reduction rate is 10%.
Test example 1
The chlorine ion corrosion resistance of the chlorine ion corrosion resistant steel bars prepared by the methods of the above examples and comparative examples (immersion in 2% NaCl solution for 72 hours) was tested, and the test results are shown in Table 1.
TABLE 1
Test example 2
The mechanical properties of the chloride ion corrosion resistant steel bars prepared by the above examples and comparative examples were respectively tested, and the test results are shown in table 2.
TABLE 2
It is obvious to a person skilled in the art that other variants can be made on the basis of the embodiments described above, while obvious variants are still within the scope of the invention.
Claims (10)
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| CN107723603A (en) * | 2017-11-29 | 2018-02-23 | 安徽工业大学 | Yield strength 500MPa levels corrosion-resistant steel bar and manufacture method |
| CN109097682A (en) * | 2018-08-20 | 2018-12-28 | 盐城市联鑫钢铁有限公司 | A kind of high-strength fireproof reinforcing bar and preparation method thereof |
| CN111575466A (en) * | 2020-06-29 | 2020-08-25 | 张家港联峰钢铁研究所有限公司 | Heat treatment preparation method of heat-strength corrosion-resistant steel |
| CN116673323A (en) * | 2023-06-21 | 2023-09-01 | 武汉钢铁有限公司 | Manufacturing method of high-strength anti-seismic steel bar with high yield ratio |
| US20240068064A1 (en) * | 2021-01-15 | 2024-02-29 | Institute Of Research Of Iron And Steel, Jiangsu Province/Sha-Steel, Co. Ltd (CN) | 400 MPa CORROSION-RESISTANT STEEL BAR AND PRODUCTION METHOD THEREOF |
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- 2024-08-28 CN CN202411192051.9A patent/CN119076609A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107723603A (en) * | 2017-11-29 | 2018-02-23 | 安徽工业大学 | Yield strength 500MPa levels corrosion-resistant steel bar and manufacture method |
| CN109097682A (en) * | 2018-08-20 | 2018-12-28 | 盐城市联鑫钢铁有限公司 | A kind of high-strength fireproof reinforcing bar and preparation method thereof |
| CN111575466A (en) * | 2020-06-29 | 2020-08-25 | 张家港联峰钢铁研究所有限公司 | Heat treatment preparation method of heat-strength corrosion-resistant steel |
| US20240068064A1 (en) * | 2021-01-15 | 2024-02-29 | Institute Of Research Of Iron And Steel, Jiangsu Province/Sha-Steel, Co. Ltd (CN) | 400 MPa CORROSION-RESISTANT STEEL BAR AND PRODUCTION METHOD THEREOF |
| CN116673323A (en) * | 2023-06-21 | 2023-09-01 | 武汉钢铁有限公司 | Manufacturing method of high-strength anti-seismic steel bar with high yield ratio |
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