CN113981327B - Preparation method of low-cost HRB400cE chloride ion corrosion resistant steel bar product - Google Patents
Preparation method of low-cost HRB400cE chloride ion corrosion resistant steel bar product Download PDFInfo
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- CN113981327B CN113981327B CN202111282204.5A CN202111282204A CN113981327B CN 113981327 B CN113981327 B CN 113981327B CN 202111282204 A CN202111282204 A CN 202111282204A CN 113981327 B CN113981327 B CN 113981327B
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 33
- 239000010935 stainless steel Substances 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 117
- 239000010959 steel Substances 0.000 claims abstract description 117
- 230000007797 corrosion Effects 0.000 claims abstract description 34
- 238000005260 corrosion Methods 0.000 claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 73
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 53
- 229910052742 iron Inorganic materials 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 22
- 238000007670 refining Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 12
- 229910052719 titanium Inorganic materials 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 229910052706 scandium Inorganic materials 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000009628 steelmaking Methods 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 5
- 239000003595 mist Substances 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000010936 titanium Substances 0.000 description 17
- 239000010949 copper Substances 0.000 description 14
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 229910052791 calcium Inorganic materials 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 229910052761 rare earth metal Inorganic materials 0.000 description 5
- 150000002910 rare earth metals Chemical class 0.000 description 5
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 4
- 229910052738 indium Inorganic materials 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- -1 chlorine ions Chemical class 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C6/00—Coating by casting molten material on the substrate
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- Manufacturing & Machinery (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to the technical field of metallurgy, in particular to a low-cost HRB400cE chloride ion corrosion resistant steel bar, which comprises the following chemical elements in percentage by mass: 0.02-0.04% of C, 0.7-1.4% of Mn, 0.5-1.0% of Si, 0.008-0.015% of S, 0.006-0.01% of P, 0.05-0.08% of Cr, 0.10-0.12% of Cu, 0.6-1.3% of Ti, 0.10-0.14% of Ni, 0.02-0.05% of In, 0.02-0.10% of Sc and the balance of Fe; the invention relieves the corrosion of the chloride ions of the steel bar, and simultaneously attaches the In metal film on the surface of the steel bar, further improves the chloride ion corrosion resistance of the steel bar, and simultaneously ensures that the steel bar cannot be corroded after being placed for a long time.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a preparation method of a low-cost HRB400cE chloride ion corrosion resistant steel bar product.
Background
The corrosion of steel reinforcement is one of the main failure mechanisms of reinforced concrete structures in temperature, marine and industrial environments. It has become a major durability issue for investors and engineers. Without diminishing this aggressiveness, it accelerates the deterioration of the reinforced concrete structure, which may lead to a series of associated serious consequences including, but not limited to, cracking and spalling of the concrete protective layer, loss of reinforcement cross-sectional area, degraded steel-concrete interface bonding, and ultimately reduced service life of the reinforced concrete structure.
At present, the problem of chloride ion corrosion of steel bars is not solved well, only alloy elements for improving corrosion resistance by adding Ni, Cu and Al during steel smelting can be adopted, and in order to solve the problem of corrosion of the steel bars in concrete, a steel bar product resistant to chloride ion corrosion is urgently needed.
Disclosure of Invention
The invention aims to provide a low-cost HRB400cE chloride corrosion resistant steel bar, which comprises the following chemical elements in percentage by mass: 0.02-0.04% of C, 0.7-1.4% of Mn, 0.5-1.0% of Si, 0.008-0.015% of S, 0.006-0.01% of P, 0.05-0.08% of Cr, 0.10-0.12% of Cu, 0.6-1.3% of Ti, 0.10-0.14% of Ni, 0.02-0.05% of In, 0.02-0.10% of Sc and the balance of Fe.
The preparation method of the HRB400cE chloride ion corrosion resistant steel bar product comprises the following steps;
s1, desulfurization smelting: heating scrap steel and molten iron to 1600-1800 ℃ by using an electric furnace, stirring the molten iron in a molten iron tank by rotating a stirrer to generate a vortex, and rolling the added desulfurizer into the molten iron to fully react to completely melt the molten iron to obtain molten steel;
s2, refining: transferring the molten steel obtained in the step S1 to a refining furnace, heating to 1600-1900 ℃, and adding C, Mn, Si, Cr, Cu, Ti, Ni and Sc which are mixed according to mass ratio into the refining furnace for refining to obtain refined molten steel;
s3, deoxidation: the powdery deoxidizer blown into the molten steel becomes bubbles to rise at the steelmaking temperature, and the deoxidation reaction also occurs on the interface of the bubbles and the molten steel;
s4: continuous casting: controlling the casting temperature to be 1500-1550 ℃, and continuously casting to obtain a steel billet;
s5: rolling: discharging a steel billet out of a furnace, continuously rolling the steel billet after water descaling, and performing rough rolling, intermediate rolling, pre-finish rolling and rolling by a finishing mill set, wherein a water cooling device is arranged in the process, and Sc molten metal is poured on the surface of the steel billet after finish rolling, and meanwhile, the total reduction rate of finish rolling is ensured to be more than or equal to 46%;
s6: surface treatment: and after finish rolling, carrying out mist cooling on the surface of the steel bar to 500-650 ℃, uniformly pouring In metal liquid on the surface of the steel bar, and continuously and slowly cooling the steel bar to obtain the high-strength corrosion-resistant steel bar.
Optionally, the tapping blank temperature is 1400-1500 ℃, and the pulling speed is 2.1-3.8 m/min.
Optionally, in the step S3, a spray gun is used to directly introduce a powdery deoxidizer (such as calcium, magnesium, rare earth metal, aluminum, and silicon iron) to the outside of the molten steel furnace, and the temperature of the deoxidation process is 1500-1700 ℃.
Optionally, the initial rolling temperature before rough rolling in step S5 is 1100-1300 ℃.
Optionally, the rolling temperature in the step S5 is controlled to 1050-1200 ℃.
Optionally, the pre-finish rolling temperature in the step S5 is controlled to be 850-950 ℃.
Optionally, the finish rolling temperature in the step S5 is controlled to be 800-850 ℃.
Optionally, the cold bed air cooling process includes: cooling to 150-200 ℃ at the speed of 7-12 ℃/s, and finally air-cooling to room temperature.
Optionally, a corrosion-resistant layer with the thickness of 0.1-0.6 mm is formed on the surface of the steel bar after the In metal liquid is finish rolled.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, C, Mn, Si, Cr, Cu, Ti, Ni and Sc elements are added into a refining furnace for refining to obtain refined molten steel, a steel billet is taken out of the furnace and is continuously rolled after water descaling, and then is subjected to rough rolling, medium rolling, pre-finish rolling and rolling by a finishing mill set, Sc metal liquid is poured on the surface of the steel billet after finish rolling, and then during surface treatment, the surface of the steel bar after finish rolling is fog-cooled to 500-650 ℃, In metal liquid is evenly poured on the surface of the steel bar, and the steel bar is continuously and slowly cooled, so that the high-strength pair chlorine ion corrosion resistant steel bar can be obtained, the corrosion action of the chlorine ions of the steel bar is relieved under the action of the Ti, Ni and Sc elements, and meanwhile, an In metal film is attached to the surface of the steel bar, the chlorine ion corrosion resistance of the steel bar is further improved, and the steel bar is ensured not to be corroded after being placed for a long time.
Drawings
FIG. 1 is a flow chart of the preparation method of the present invention.
The objects, features, and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a low-cost HRB400cE chloride corrosion resistant steel bar, which is characterized in that the steel bar comprises the following chemical elements by mass: 0.02-0.04% of C, 0.7-1.4% of Mn, 0.5-1.0% of Si, 0.008-0.015% of S, 0.006-0.01% of P, 0.05-0.08% of Cr, 0.10-0.12% of Cu, 0.6-1.3% of Ti, 0.10-0.14% of Ni, 0.01-0.08% of In, 0.02-0.05% of Sc, and the balance of Fe.
In the present invention:
carbon (C) is an important element for securing strength, and if the content is too high, martensite is likely to be formed when the cooling rate is high in addition to deterioration of weldability, and the carbon content is controlled to be extremely low in the steel making process, and the C content is limited to 0.02 to 0.04% in the present invention.
The sulfur (S) is combined with Mn in steel to form a nonmetallic inclusion which plays a role of a corrosion initiator, is a factor causing hot brittleness, and the content of the nonmetallic inclusion is reduced as much as possible, wherein the content of S is limited to be 0.008-0.015%.
Phosphorus (P) is an element which exists in steel as a solid solution element and is advantageous for improving the strength and hardness of steel by causing solid solution strengthening, and is easily segregated and deteriorates the toughness of steel, and the content of P is limited to 0.006 to 0.01%.
Copper (Cu) can improve the atmospheric corrosion resistance of steel, particularly can improve the strength and yield ratio of the steel when being matched with P, and the Cu content is limited to be 0.10-0.12%.
The preparation method of the low-cost HRB400cE chloride ion corrosion resistant steel bar product comprises the following steps;
s1, desulfurization smelting: heating scrap steel and molten iron to 1600-1800 ℃ by using an electric furnace, stirring the molten iron in a molten iron tank by rotating a stirrer to generate vortexes in the molten iron, and rolling the added desulfurizer into the molten iron for full reaction, so that the molten iron is desulfurized, and the desulfurizing agent has the characteristics of high desulfurization efficiency, low desulfurizer consumption, low metal loss and the like, is completely melted to obtain molten steel;
s2, refining: transferring the molten steel obtained in the step S1 to a refining furnace, heating to 1600-1900 ℃, and adding C, Mn, Si, Cr, Cu, Ti, Ni and Sc which are mixed according to mass ratio into the refining furnace for refining to obtain refined molten steel;
s3, deoxidation: the powdery deoxidizer blown into the molten steel becomes bubbles and rises at the steel-making temperature, and the deoxidation reaction also occurs at the interface between the bubbles and the molten steel. Wherein the deoxidation is also called powder injection deoxidation, and the substance of the deoxidation still belongs to precipitation deoxidation;
s4: continuous casting: controlling the casting temperature to be 1500-1550 ℃, and continuously casting to obtain a steel billet;
s5: rolling: discharging a steel billet out of a furnace, continuously rolling the steel billet after water descaling, and performing rough rolling, intermediate rolling, pre-finish rolling and rolling by a finishing mill set, wherein a water cooling device is arranged in the process, and Sc molten metal is poured on the surface of the steel billet after finish rolling, and meanwhile, the total reduction rate of finish rolling is ensured to be more than or equal to 46%;
s6: surface treatment: and after finish rolling, carrying out mist cooling on the surface of the steel bar to 500-650 ℃, uniformly pouring In metal liquid on the surface of the steel bar, and continuously and slowly cooling the steel bar to obtain the high-strength pair steel bar resistant to chloride ion corrosion.
The temperature of the steel tapping blank is 1400-1500 ℃, and the pulling speed is 2.1-3.8 m/min.
In the step S3, a spray gun is adopted to directly introduce powdery deoxidizer (such as calcium, magnesium, rare earth metal, aluminum and ferrosilicon) outside the molten steel furnace, and the temperature of the deoxidation process is 1500-1700 ℃.
The initial rolling temperature before rough rolling is 1100-1300 ℃.
The initial rolling temperature is controlled to be 1050-1200 ℃.
The pre-finish rolling temperature is controlled to be 850-950 ℃.
And the finish rolling temperature is controlled to be 800-850 ℃.
The cold bed air cooling process comprises the following steps: cooling to 150-200 ℃ at the speed of 7-12 ℃/s, and finally air-cooling to room temperature.
And forming a corrosion-resistant layer with the thickness of 0.1-0.6 mm on the surface of the steel bar after finish rolling by the In metal liquid.
According to the technical scheme, Ni, Sc and In are added into C, Mn, Si, Cr, Cu and Ti which are used traditionally, the performance and corrosion resistance of the steel bar are greatly improved through the added elements, and the corrosion resistance effect of the chloride ion corrosion resistant steel bar is greatly improved under the condition that the cost is low (compared with the sample prepared by the conventional method, the cost is not increased or not remarkably increased) by referring to the sample prepared by the conventional method In the embodiment table and the performance data of the following two embodiments.
Example 1
The low-cost HRB400cE chloride ion corrosion resistant steel bar is characterized in that the chemical elements in percentage by mass are as follows: 0.02% of C, 0.7% of Mn, 0.5% of Si, 0.008% of S, 0.006% of P, 0.05% of Cr, 0.10% of Cu, 0.6% of Ti, 0.10% of Ni, 0.02% of In, 0.02% of Sc and the balance of Fe.
The preparation method comprises the following steps:
heating scrap steel and molten iron to 1600-1800 ℃ by an electric furnace, stirring the molten iron in a molten iron tank by a stirrer in a rotating manner to generate vortex, winding an added desulfurizer into the molten iron to fully react, completely melting the desulfurizer to obtain molten steel, transferring the obtained molten steel into a refining furnace, heating the molten steel to 1600-1900 ℃, adding C, Mn, Si, Cr, Cu, Ti, Ni and Sc which are prepared according to mass ratio into the refining furnace to refine to obtain refined molten steel, wherein Mn is used for preventing hot brittleness caused by sulfur, but when the content of Mn is excessive, the toughness and weldability of the material are deteriorated, the content of Mn is limited to 0.7%, Si is used as a deoxidizer of steel, the content of Si is limited to 0.5%, Cr can increase the hardenability of steel and has the function of secondary hardening, the hardness, wear resistance and corrosion resistance of carbon steel can be improved, but when the content is excessively high, the strength and hardness of the steel will be reduced, the embodiment limits the Cr content to 0.05%, Ni can improve the strength In the steel without significantly reducing the toughness, and can make the steel acid-resistant, alkali-resistant, and corrosion-resistant to atmosphere and salt, the embodiment limits the Ni content to 0.10%, Ti can reduce austenite phase region, solid solution titanium can improve hardenability of the steel, and TiC particle can reduce hardenability of the steel, the embodiment limits the Ti content to 0.6%, Sc can significantly improve the strength and hardness of cast iron, and can relieve corrosion of original battery principle generated by chloride ion, the embodiment limits the Sc content to 0.02%, In has very good ductility, can bend along with the steel bar on the surface of the steel bar, can better protect against chloride ion corrosion, the embodiment limits the In content to 0.02%, and a spray gun is adopted to perform powder deoxidizer (such as calcium, magnesium, rare earth metal, calcium, rare earth metal, and the like), Aluminum and ferrosilicon) is directly introduced outside a molten steel furnace, the temperature of the deoxidation process is 1500-1700 ℃, the bubbles rise at the steelmaking temperature, the deoxidation reaction also occurs on the interface of the bubbles and the molten steel, the casting temperature is controlled to be 1500-1550 ℃, the pulling speed is 2.1-3.8 m/min, a steel billet is obtained by continuous casting, the steel billet is taken out of the furnace and is continuously rolled after water descaling, rough rolling, intermediate rolling, pre-finish rolling and rolling by a finishing mill set are carried out, the rolling temperature before rough rolling is 1100-1300 ℃, the rolling treatment temperature is 1050-1200 ℃, the pre-finish rolling temperature is controlled to be 850-950 ℃, the finish rolling temperature is controlled to be 800-850 ℃, a water-penetrating cooling device is arranged during the period, Sc metal liquid is poured on the surface of the steel billet after finish rolling, the total finish rolling reduction rate is ensured to be not less than 46%, the surface mist cooling of the steel bar is carried out to be 500-650 ℃ after finish rolling, In metal liquid is uniformly poured on the surface of the steel bar, the steel bar is cooled to be 150-200 ℃ at the speed of 7-12 ℃/s, and finally, air cooling to room temperature to obtain the high-strength pair reinforcing steel bar resistant to chloride ion corrosion.
Example 2
The low-cost HRB400cE chloride ion corrosion resistant steel bar comprises the following chemical elements in percentage by mass: 0.04% of C, 1.4% of Mn, 1.0% of Si, 0.015% of S, 0.01% of P, 0.08% of Cr, 0.12% of Cu, 1.3% of Ti, 0.14% of Ni, 0.05% of In, 0.10% of Sc and the balance of Fe.
The preparation method comprises the following steps:
heating scrap steel and molten iron to 1600-1800 ℃ by an electric furnace, stirring the molten iron in a molten iron tank by a stirrer in a rotating manner to generate vortex, winding an added desulfurizer into the molten iron to fully react, completely melting the desulfurizer to obtain molten steel, transferring the obtained molten steel into a refining furnace, heating the molten steel to 1600-1900 ℃, adding C, Mn, Si, Cr, Cu, Ti, Ni and Sc which are prepared according to mass ratio into the refining furnace to refine to obtain refined molten steel, wherein Mn is used for preventing hot brittleness caused by sulfur, but when the content of Mn is excessive, the toughness and weldability of the material are deteriorated, the content of Mn is limited to be 1.4%, Si is used as a deoxidizer of steel, the content of Si is limited to be 1.0%, Cr can increase the hardenability of steel and has the function of secondary hardening, the hardness, wear resistance and corrosion resistance of carbon steel can be improved, but when the content is excessively high, the strength and hardness of the steel will be reduced, the embodiment limits the Cr content to 0.08%, Ni can improve the strength In the steel without significantly reducing the toughness, and can make the steel acid-resistant, alkali-resistant, and corrosion-resistant to atmosphere and salt, the embodiment limits the Ni content to 0.14%, Ti can reduce austenite phase region, solid solution titanium can improve hardenability of the steel, and TiC particle can reduce hardenability of the steel, the embodiment limits the Ti content to-1.3%, Sc can significantly improve the strength and hardness of cast iron, and can relieve corrosion of original battery principle generated by chloride ion, the embodiment limits the Sc content to 0.10%, In has very good ductility, can be bent along with the steel bar on the surface of the steel bar, can better protect against chloride ion corrosion, the embodiment limits the In content to 0.05%, and a spray gun is adopted to pass powdery deoxidizer (such as calcium, magnesium, and aluminum, etc.) Rare earth metal, aluminum and ferrosilicon) is directly introduced outside a molten steel furnace, the temperature of the deoxidation process is 1500-1700 ℃, the molten steel becomes bubbles and rises at the steelmaking temperature, the deoxidation reaction also occurs on the interface of the bubbles and the molten steel, the casting temperature is controlled to be 1500-1550 ℃, the pulling speed is 2.1-3.8 m/min, a billet is obtained by continuous casting, the billet is taken out of the furnace and is continuously rolled after water descaling, rough rolling, intermediate rolling, pre-finish rolling and rolling of a finishing mill group are carried out, the starting temperature before rough rolling is 1100-1300 ℃, the starting temperature is controlled to be 1050-1200 ℃, the pre-finish rolling temperature is controlled to be 850-950 ℃, the finish rolling temperature is controlled to be 800-850 ℃, a water cooling device is arranged during the process, Sc metal liquid is poured on the surface of the billet after finish rolling, the total reduction rate is ensured to be not less than 46%, the surface mist of the steel bar is cooled to be 500-650 ℃ after finish rolling, In metal liquid is uniformly poured on the surface of the steel bar, and cooling to 150-200 ℃ at the speed of 7-12 ℃/s, and finally air-cooling to room temperature to obtain the high-strength pair chloride ion corrosion-resistant reinforcing steel bar.
In summary, the room temperature mechanical properties and the chloride ion corrosion resistance rate of the steel bars after the experimental procedures of the above examples 1 and 2 are shown in the following table:
while the invention has been described in further detail in connection with specific embodiments thereof, it will be understood that the invention is not limited thereto, and that various other modifications and substitutions may be made by those skilled in the art without departing from the spirit of the invention, which should be considered to be within the scope of the invention as defined by the appended claims.
Claims (6)
1. The preparation method of the low-cost HRB400cE chloride ion corrosion resistant steel bar product is characterized in that the method comprises the following chemical elements by mass percent: 0.02-0.04% of C, 0.7-1.4% of Mn, 0.5-1.0% of Si, 0.008-0.015% of S, 0.006-0.01% of P, 0.05-0.08% of Cr, 0.10-0.12% of Cu, 0.6-1.3% of Ti, 0.10-0.14% of Ni, 0.02-0.05% of In, 0.02-0.10% of Sc and the balance of Fe;
the preparation method of the low-cost HRB400cE chloride ion corrosion resistant steel bar product comprises the following steps;
s1, desulfurization smelting: heating scrap steel and molten iron to 1600-1800 ℃ by using an electric furnace, stirring the molten iron in a molten iron tank by rotating a stirrer to generate a vortex, and rolling the added desulfurizer into the molten iron to fully react to completely melt the molten iron to obtain molten steel;
s2, refining: transferring the molten steel obtained in the step S1 to a refining furnace, heating to 1600-1900 ℃, and adding C, Mn, Si, Cr, Cu, Ti, Ni and Sc which are mixed according to mass ratio into the refining furnace for refining to obtain refined molten steel;
s3, deoxidation: the powdery deoxidizer blown into the molten steel becomes bubbles to rise at the steelmaking temperature, and the deoxidation reaction also occurs on the interface of the bubbles and the molten steel;
s4: continuous casting: controlling the casting temperature to be 1500-1550 ℃, and continuously casting to obtain a steel billet;
s5: rolling: discharging a steel billet out of a furnace, continuously rolling the steel billet after water descaling, and performing rough rolling, intermediate rolling, pre-finish rolling and rolling by a finishing mill set, wherein a water cooling device is arranged in the process, and Sc molten metal is poured on the surface of the steel billet after finish rolling, and meanwhile, the total reduction rate of finish rolling is ensured to be more than or equal to 46%;
s6: surface treatment: and after finish rolling, carrying out mist cooling on the surface of the steel bar to 500-650 ℃, uniformly pouring In metal liquid on the surface of the steel bar, and continuously and slowly cooling the steel bar to obtain the high-strength steel bar resistant to chloride ion corrosion.
2. The method for preparing a low-cost HRB400cE bar product with resistance to chloride ion corrosion according to claim 1, wherein: in the step S3, a spray gun is adopted to directly introduce the powdery deoxidizer outside the molten steel furnace, and the temperature of the deoxidation process is 1500-1700 ℃.
3. The method for preparing a low-cost HRB400cE bar product with resistance to chloride ion corrosion according to claim 1, wherein: the initial rolling temperature before rough rolling in the step S5 is 1100-1300 ℃.
4. The method for preparing a low-cost HRB400cE bar product with resistance to chloride ion corrosion according to claim 1, wherein: and in the step S5, the pre-finish rolling temperature is controlled to be 850-950 ℃.
5. The method for preparing a low-cost HRB400cE bar product with resistance to chloride ion corrosion according to claim 1, wherein: and in the step S5, the finish rolling temperature is controlled to be 800-850 ℃.
6. The method for preparing a low-cost HRB400cE bar product with resistance to chloride ion corrosion according to claim 1, wherein: and forming a corrosion-resistant layer with the thickness of 0.1-0.6 mm on the surface of the steel bar after finish rolling by the In metal liquid.
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