CN113897555A - Preparation method of HRB600 high-strength anti-seismic steel bar - Google Patents
Preparation method of HRB600 high-strength anti-seismic steel bar Download PDFInfo
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- CN113897555A CN113897555A CN202111194376.7A CN202111194376A CN113897555A CN 113897555 A CN113897555 A CN 113897555A CN 202111194376 A CN202111194376 A CN 202111194376A CN 113897555 A CN113897555 A CN 113897555A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 128
- 239000010959 steel Substances 0.000 title claims abstract description 128
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 17
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 37
- 238000001816 cooling Methods 0.000 claims description 27
- 238000010079 rubber tapping Methods 0.000 claims description 26
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- 238000007664 blowing Methods 0.000 claims description 24
- 239000002893 slag Substances 0.000 claims description 23
- 229910052742 iron Inorganic materials 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 21
- 238000009749 continuous casting Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000005096 rolling process Methods 0.000 claims description 16
- 238000007670 refining Methods 0.000 claims description 15
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 claims description 13
- 229910001199 N alloy Inorganic materials 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 12
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 11
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 11
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 10
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 238000009628 steelmaking Methods 0.000 claims description 9
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 8
- 239000011572 manganese Substances 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000005275 alloying Methods 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052785 arsenic Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims 7
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000012535 impurity Substances 0.000 abstract description 6
- 238000005728 strengthening Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 3
- 239000006104 solid solution Substances 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009865 steel metallurgy Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000005303 weighing Methods 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
-
- 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
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a preparation method of HRB600 high-strength anti-seismic steel bar, wherein the anti-seismic steel bar comprises the following chemical components in percentage by mass: 0.25 to 0.28%, Si: 0.55-0.70%, Mn: 1.45-1.55%, V: 0.12-0.14%, P + S is less than or equal to 0.035%, and the balance of Fe and impurities. The invention adopts the component design of high C, high Si, high Mn and high V, fully utilizes the solid solution strengthening effect of C, Si, Mn and V, improves and stabilizes the yield ratio, solves the problems of high production cost, incapability of meeting the anti-seismic requirement on the yield ratio and limited strength improvement existing in the production of anti-seismic steel bars by the existing microalloying technology, and can prepare the 600MPa grade high-strength anti-seismic steel bar with the performance meeting the new national standard requirement, low cost and high strength without upgrading and reconstructing equipment by adopting the existing equipment.
Description
Technical Field
The invention relates to a preparation method of a high-strength anti-seismic HRB600 steel bar, belonging to the technical field of steel metallurgy and steel making rolling.
Background
The hot-rolled ribbed steel bar is widely applied to various reinforced concrete structures, and plays an important role in ensuring the service life and the use safety of reinforced concrete buildings. The grade of Hot-rolled ribbed steel bars in China is represented by HRB plus minimum yield strength (MPa), such as HRB335, HRB400, HRB500 and the like, and H, R, B respectively represents Hot rolling (Hot rolled), ribbed (Ribbled) and steel bars (bars). The higher the grade of the reinforcing steel bar is, the better the quality is, the strength, the toughness and the extensibility are all enhanced, and the popularization of the high-strength reinforcing steel bar is more beneficial to reducing the using amount of the reinforcing steel bar undoubtedly.
In recent years, as natural disasters such as earthquakes occur frequently around the world, engineering seismic resistance has become an important means for resisting natural disasters. The performance of the steel bar, which is the most commonly used material in engineering construction, is directly related to the safety of the engineering construction. At present, anti-seismic steel bars with high yield ratio and high uniform elongation rate become the mainstream of steel bars for buildings. According to the current national standard, the steel bars are required to resist earthquake, so that high-strength earthquake-resistant threaded steel bars HRB400E, HRB500E, HRB600 and the like (E represents earthquake-resistant steel bars) are provided. The anti-seismic steel bar (HRB600) with the yield strength of 600MPa is one of the most widely applied varieties in high-strength steel bars. The three anti-seismic indexes of the anti-seismic steel bar applied to the anti-seismic structure, namely the strength-to-yield ratio (tensile strength/yield strength), the yield-to-yield ratio and the elongation at maximum force, are far higher than those of the common steel bar, particularly the strength-to-yield ratio, and the reduction range is larger along with the increase of the yield strength, so that the high strength-to-yield ratio is the largest technical problem to be solved by the 600MPa high-strength anti-seismic steel bar.
The production of high-strength anti-seismic reinforcing steel bars mainly comprises a microalloying strengthening technology, a waste heat treatment technology and a fine grain strengthening technology at present, and because the new national standard GB/T1499.2-2018 increases the requirements of metallographic structure inspection, the microalloying technology is mainly adopted in various large steel mills at present, the V, Nb microalloying technology is generally adopted, but the problems of high production cost, incapability of meeting the anti-seismic requirement in the yield ratio, limited strength improvement and the like exist.
Disclosure of Invention
In view of the above, aiming at the defects of the prior art, the invention provides a preparation method of an HRB600 high-strength anti-seismic reinforcing steel bar, which aims to solve the problems of high production cost, incapability of meeting anti-seismic requirements in terms of strength-to-yield ratio and limited strength improvement existing in the production of anti-seismic reinforcing steel bars by using the existing microalloying technology, and the prepared 600MPa high-strength anti-seismic reinforcing steel bar can meet new national standard requirements in terms of performance, low cost and high strength, and can be prepared by using the existing equipment without upgrading and reconstructing the equipment.
In order to solve the technical problems, the technical scheme of the invention provides a preparation method of an HRB600 high-strength anti-seismic reinforcing steel bar, wherein the HRB600 high-strength anti-seismic reinforcing steel bar comprises the following chemical components in percentage by mass: 0.25 to 0.28%, Si: 0.55-0.70%, Mn: 1.45-1.55%, V: 0.12-0.14%, P + S is less than or equal to 0.035%, Cr is less than or equal to 0.3%, Ni is less than or equal to 0.05%, Cu is less than or equal to 0.15%, Mo is less than or equal to 0.05%, As is less than or equal to 0.06%, and the balance is Fe;
the preparation method comprises the following steps:
s1: smelting molten iron, steelmaking and refining molten steel:
adding molten iron and scrap steel into a converter according to the weight ratio of 10: 1-1.5 for converting for 10-15 min, and controlling the carbon content at the end point to be more than or equal to 0.08% and the temperature at the end point to be less than or equal to 1680 ℃ after converting; adding ferrosilicon, silicomanganese and vanadium-nitrogen alloy in the tapping process, carrying out deoxidation alloying operation and molten steel refining, and then sending to continuous casting and pouring;
s2: continuous casting:
continuous casting and whole-process protective casting are adopted, wherein the liquidus temperature of molten steel is 1505-1510 ℃, the superheat degree of the molten steel of a tundish is preferably controlled at 15-25 ℃, the normal temperature of the molten steel of the tundish is 1515-;
s3: heating and rolling process:
heating the casting blank to 1050-1100 ℃, controlling the initial rolling temperature to 1040-1090 ℃, adopting a pre-water-penetrating process before a finishing mill group, and controlling the water supply amount to 50-150 m3The cooling time is 0.5-1.5 s, the water inlet temperature is less than or equal to 35 ℃, the water outlet temperature is less than 55 ℃, the surface temperature of the steel part after pre-water-through cooling is 850-950 ℃, and the temperature after pre-water-through cooling is the final rolling temperature; and (3) allowing the steel piece to enter a cooling bed through a conveying roller way, performing air cooling at the temperature of 700-800 ℃, cooling, performing fixed-length shearing, inspecting and warehousing.
Preferably, the molten iron in the step S1 has the following chemical components in percentage by mass: more than or equal to 4.0 percent of C, less than or equal to 0.6 percent of Si and Ti, more than or equal to 0.25 percent of V, less than or equal to 0.2 percent of P, less than or equal to 0.1 percent of S, less than or equal to 0.7 percent of slag, and the balance of Fe.
Further, in the step S1, the content of S in the molten iron fed into the furnace is controlled to be less than or equal to 0.045%, and the temperature is controlled to be more than or equal to 1250 ℃.
Further, if the molten iron obtained in the molten iron smelting process is vanadium-containing molten iron, vanadium extraction is needed before the steel-making process, and the molten iron after vanadium extraction is semisteel. In the steelmaking process, the S content of semisteel is controlled to be less than or equal to 0.035%, and the temperature is controlled to be more than or equal to 1320 ℃. If the quality of molten iron fluctuates, a shallow vanadium extraction operation mode is adopted for vanadium extraction in the converter, so that the C content of semisteel is ensured to be more than or equal to 3.2%, and the temperature is more than or equal to 1320 ℃.
Furthermore, the tapping method in the steelmaking process adopts slag stopping tapping. The slag-stopping tapping method is characterized in that a tapping hole is immediately lifted when slag is found, the slag discharging amount is strictly controlled, and the thickness of a ladle slag layer is less than or equal to 50 mm.
Furthermore, the ladle adopts the whole process of bottom blowing nitrogen in the tapping process in the steelmaking process, so that molten steel in the ladle can be stirred, and the alloy added into the molten steel can be quickly melted.
Furthermore, in the steelmaking process, ferrosilicon, silicomanganese and vanadium-nitrogen alloy are added into a steel ladle for tapping to perform deoxidation alloying, and the ferrosilicon and the silicomanganese are roasted to enable the temperature to be more than 200 ℃ when being added. The adding time of the ferrosilicon alloy, the silicomanganese alloy and the vanadium-nitrogen alloy is that the ferrosilicon alloy, the silicomanganese alloy and the vanadium-nitrogen alloy are added into a steel ladle along with tapping molten steel when the molten steel amount reaches steel ladle 1/4, and the adding is finished when the molten steel amount reaches steel ladle 2/3. The alloy is added in the order of weak first and strong second.
Further, the molten steel refining process comprises ladle bottom argon blowing and LF furnace refining. The ladle bottom argon blowing is a common external refining technology, can well stir molten steel while increasing gas flow, can more effectively remove impurities in the molten steel, and improves the purity of steel. The LF furnace is used for refining, the equipment is simple, the investment cost is low, the operation is flexible, and the refining effect is good.
Furthermore, the liquid level of the molten steel of the tundish in the continuous casting process is controlled to be 500-800 mm, and the liquid level of the molten steel of the tundish in the continuous casting heat is strictly forbidden to be lower than 300 mm.
Compared with the prior art, the invention has the beneficial effects that:
1. the steel bar alloy system of the invention is simple, is easy for blank smelting and continuous casting high-efficiency production, does not adopt noble alloys such as nickel, molybdenum and the like, and silicon-manganese alloy and silicon-iron alloy are added in a specific sequence by heating, so that the addition amount is reduced to a certain extent, thereby reducing the alloy cost and the production cost.
2. The pre-water-penetrating process before finish rolling can inhibit the precipitation of net-shaped carbide, reduce the net carbon level, refine crystal grains and improve the mechanical property and the fatigue strength of the steel bar.
3. The invention adopts the component design of high C, high Si, high Mn and high V, fully utilizes the solid solution strengthening effect of C, Si, Mn and V, and improves and stabilizes the yield ratio.
4. The HRB600 high-strength anti-seismic steel bar prepared by the method has excellent mechanical properties, the yield strength and the tensile strength of the steel bar exceed 600MPa, and simultaneously, the high strength and the high toughness are considered.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to specific embodiments.
The invention discloses a preparation method of an HRB600 high-strength anti-seismic steel bar, wherein the HRB600 high-strength anti-seismic steel bar comprises the following chemical components in percentage by mass: 0.25 to 0.28%, Si: 0.55-0.70%, Mn: 1.45-1.55%, V: 0.12-0.14%, P + S is less than or equal to 0.035%, Cr is less than or equal to 0.3%, Ni is less than or equal to 0.05%, Cu is less than or equal to 0.15%, Mo is less than or equal to 0.05%, As is less than or equal to 0.06%, and the balance is Fe;
the preparation method comprises the following steps:
s1: smelting molten iron, steelmaking and refining molten steel:
adding molten iron and scrap steel into a converter according to the weight ratio of 10: 1-1.5 for blowing, and controlling the S content of the molten iron fed into the converter to be less than or equal to 0.045% and the temperature to be more than or equal to 1250 ℃; the S content of the semisteel is less than or equal to 0.045%, the temperature is more than or equal to 1320 ℃, the blowing is carried out for 10-15 min, the end point carbon content is controlled to be more than or equal to 0.08% after the blowing is finished, and the end point temperature is less than or equal to 1680 ℃; the molten steel refining process comprises ladle bottom argon blowing and LF furnace refining, wherein a silicon-iron alloy, a silicon-manganese alloy and a vanadium-nitrogen alloy are added in the tapping process, and the molten steel is conveyed to continuous casting and pouring after deoxidation alloying operation and molten steel refining;
s2: continuous casting:
continuous casting and whole-process protective casting are adopted, wherein the liquidus temperature of molten steel is 1505-1510 ℃, the superheat degree of the molten steel of a tundish is preferably controlled at 15-25 ℃, the normal temperature of the molten steel of the tundish is 1515-;
s3: heating and rolling process:
heating the casting blank to 1050-1100 ℃, controlling the initial rolling temperature to 1040-1090 ℃, adopting a pre-water-penetrating process before a finishing mill group, and controlling the water supply amount to 50-150 m3The cooling time is 0.5-1.5 s, the water inlet temperature is less than or equal to 35 ℃, the water outlet temperature is less than 55 ℃, the surface temperature of the pre-through water cooled steel part is 850-950 ℃,the temperature after the pre-through water cooling is the finishing temperature; and (3) allowing the steel piece to enter a cooling bed through a conveying roller way, performing air cooling at the temperature of 700-800 ℃, cooling, performing fixed-length shearing, inspecting and warehousing.
Preferably, the molten iron in the step S1 has the following chemical components in percentage by mass: more than or equal to 4.0 percent of C, less than or equal to 0.6 percent of Si and Ti, more than or equal to 0.25 percent of V, less than or equal to 0.2 percent of P, less than or equal to 0.1 percent of S, less than or equal to 0.7 percent of slag, and the balance of Fe.
Preferably, the tapping method in the step S1 adopts slag-stopping tapping, which means that the slag is immediately lifted at the tap hole, and the slag discharge amount is strictly controlled: the thickness of the slag layer of the steel ladle is less than or equal to 50mm, and the steel ladle adopts whole-process bottom blowing nitrogen in the tapping process
Preferably, the temperature for adding the silicon-iron alloy and the silicon-manganese alloy in the step S1 is above 200 ℃, the adding time of the silicon-iron alloy, the silicon-manganese alloy and the vanadium-nitrogen alloy is the time when the molten steel amount reaches the ladle 1/4, the silicon-iron alloy, the silicon-manganese alloy and the vanadium-nitrogen alloy are added into the ladle together with the tapping molten steel, and the adding is finished when the molten steel amount reaches the ladle 2/3.
The ferrosilicon alloy comprises the following components in percentage by weight: si: 71-80 percent of Al is less than or equal to 1.5 percent, Ca is less than or equal to 1.0 percent, Mn is less than or equal to 0.5 percent, Cr is less than or equal to 0.5 percent, and the balance is Fe and impurities, wherein P in the impurities is less than or equal to 0.05 percent, and S is less than or equal to 0.03 percent.
The silicon-manganese alloy comprises the following components in percentage by weight: mn: 63-72%, Si: 16-20%, C is less than or equal to 2.5%, and the balance is Fe and impurities, wherein P in the impurities is less than or equal to 0.25%, and S is less than or equal to 0.04%.
The vanadium-nitrogen alloy comprises the following components in percentage by weight: v: 73-77%, N: 14 to 18 percent.
Example 1:
the method comprises the following steps of preparing phi 25mmHRB600 high-strength anti-seismic steel bars:
step S1: swinging an 80-ton converter to a molten iron adding position, and hoisting a scrap steel bucket with prepared scrap steel (10 tons) by a crown block to the front of the converter for adding; hoisting a ladle to the front of the furnace, and adding 80 tons of molten iron into the furnace; the converter was shaken up to the blowing (oxygen blowing) position. The oxygen lance is reduced, the constant pressure lance (pressure) is changed to operate, simultaneously, slagging agent (lime 29kg/t, high magnesium ash 16.5kg/t, sludge ball 12.5kg/t and the like) is added, and slag charge is divided into two partsAdding in batches; the early-stage gun position is low (the horizontal position is unchanged, and the height is adjusted to be 1m away from the liquid level of molten steel), early-stage slag formation is guaranteed, the slag is thoroughly formed in the process, and the later-stage gun position is increased (the horizontal position is unchanged, and the height is adjusted to be 1.2-1.25 m away from the liquid level of the molten steel) to prevent the slag from drying back. After blowing for 12 minutes, lifting the oxygen lance, shaking the furnace to a sampling position, measuring the temperature, sampling, conveying to a test room in front of the furnace for testing, and shaking the furnace right. According to the component requirements: HRB600 high-strength anti-seismic steel bar comprises the following chemical components in percentage by weight: 0.25%, Si: 0.55%, Mn: 1.55%, V: 0.12%, S: 0.035%, P: 0.040%, weighing corresponding weight of ferrosilicon, silicomanganese and vanadium-nitrogen, baking the ferrosilicon and silicomanganese until the temperature reaches more than 200 ℃, shaking the furnace to the furnace, tapping, turning a ladle car which is located on a ladle to the position below the furnace, adding the alloy along with steel flow when tapping 1/4, finishing adding when the molten steel amount reaches 2/3, and carrying out whole-process online argon blowing on the molten steel in the tapping process. Argon blowing pressure:
and the argon blowing time is more than 4 minutes after tapping. After the argon blowing is finished, the ladle car is driven out and the molten steel is calmed; the above smelting is completed.
Step S2: hoisting the steel ladle to a ladle turret (device), and carrying a long nozzle, adopting the whole continuous casting protective casting process, wherein the liquidus temperature of molten steel is 1505-1510 ℃, the superheat degree of the molten steel of a tundish is preferably controlled at 15-25 ℃, the normal temperature of the molten steel of the tundish is 1515-1540 ℃, the liquid level height of the molten steel of the tundish is controlled between 500 mm-800 mm, and the casting blank drawing speed is controlled at 2.8m/min, and casting into a continuous casting blank;
step S3: conveying the continuous casting blank to a bar rolling line, feeding the continuous casting blank into a heating furnace to heat to 1050-1100 ℃, controlling the initial rolling temperature to 1040 ℃, and adopting a pre-water-passing process before a finishing mill group, wherein the water supply amount is 50m3The cooling time is 0.5s, the water inlet temperature is less than or equal to 35 ℃, the water outlet temperature is less than 55 ℃, the surface temperature of the steel part after pre-water-through cooling is 850-950 ℃, and the temperature after pre-water-through cooling is the final rolling temperature; the steel piece enters a cooling bed through a conveying roller way, is cooled in air at 700-800 ℃, is cut to length after being cooled, and is inspected after being cutAnd (5) inspecting and warehousing to obtain the HRB600 high-strength anti-seismic steel bar.
Through tests, the parameters of the steel bar prepared in the embodiment 1 are shown in the table 1, and the mechanical properties of the steel are all qualified.
Example 2:
the method comprises the following steps of preparing a phi 40mmHRB600 high-strength anti-seismic steel bar:
step S1: swinging an 80-ton converter to a molten iron adding position, and hoisting a scrap steel bucket with prepared scrap steel (10 tons) by a crown block to the front of the converter for adding; hoisting a ladle to the front of the furnace, and adding 80 tons of molten iron into the furnace; the converter was shaken up to the blowing (oxygen blowing) position. The oxygen lance is reduced, the constant pressure lance (pressure) is changed, and simultaneously, slag-forming agents (lime 29kg/t, high magnesium ash 16.5kg/t, sludge balls 12.5kg/t and the like) are added, and slag materials are added in two batches; the early stage gun position is low (the horizontal position is unchanged, the height is adjusted to a position 1m away from the liquid level of the molten steel), the early stage slag is ensured to be early, the process slag is thoroughly melted, and the later stage gun position is improved (the horizontal position is unchanged, the height is adjusted to a position 1m away from the liquid level of the molten steel)
Here), prevent the slag from drying back. After blowing for 12 minutes, lifting the oxygen lance, shaking the furnace to a sampling position, measuring the temperature, sampling, conveying to a test room in front of the furnace for testing, and shaking the furnace right. According to the component requirements: HRB600 high-strength anti-seismic steel bar comprises the following chemical components in percentage by weight: 0.28%, Si: 0.70%, Mn: 1.45%, V: 0.14%, S: 0.035%, P: and 0.040 percent of silicon-iron alloy, silicon-manganese alloy and vanadium-nitrogen alloy are weighed according to the weight, the silicon-iron alloy and the silicon-manganese alloy are baked until the temperature reaches more than 200 ℃, the furnace is shaken to the furnace and then steel is discharged, a ladle car which is located on a ladle is driven to the furnace, the alloy is added along with the steel flow when the steel is discharged at 1/4, and the adding is finished when the molten steel amount reaches 2/3 of the ladle. And carrying out whole-process on-line argon blowing on the molten steel in the tapping process. Argon blowing pressure:
and the argon blowing time is more than 4 minutes after tapping. After the argon blowing is finished, the ladle car is driven out and the molten steel is calmed; the above smelting is completed.
Step S2: hoisting the steel ladle to a ladle turret (device), and carrying a long nozzle, adopting the whole continuous casting protective casting process, wherein the liquidus temperature of molten steel is 1505-1510 ℃, the superheat degree of the molten steel of a tundish is preferably controlled at 15-25 ℃, the normal temperature of the molten steel of the tundish is 1515-1540 ℃, the liquid level height of the molten steel of the tundish is controlled between 500 mm-800 mm, and the casting blank drawing speed is controlled at 2.3m/min, and casting into a continuous casting blank;
step S3: conveying the continuous casting blank to a bar rolling line, feeding the continuous casting blank into a heating furnace to heat to 1050-1100 ℃, controlling the initial rolling temperature to 1090 ℃, and adopting a pre-water-penetrating process before a finishing mill group, wherein the water supply amount is 150m3The cooling time is 1.5s, the water inlet temperature is less than or equal to 35 ℃, the water outlet temperature is less than 55 ℃, the surface temperature of the steel part after pre-water-through cooling is 850-950 ℃, and the temperature after pre-water-through cooling is the final rolling temperature; and (3) allowing the steel piece to enter a cooling bed through a conveying roller way, performing air cooling at the temperature of 700-800 ℃, performing fixed-length shearing after cooling, and inspecting and warehousing after shearing to obtain the HRB600 high-strength anti-seismic steel bar.
Through tests, the parameters of the steel bar prepared in the embodiment 2 are shown in the table 1, and the mechanical properties of the steel are all qualified.
TABLE 1. examples 1 and 2. anti-seismic bars contain chemical compositions and performance parameters
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A preparation method of HRB600 high-strength anti-seismic steel bars is characterized by comprising the following steps: the HRB600 high-strength anti-seismic steel bar comprises the following chemical components in percentage by mass: 0.25 to 0.28%, Si: 0.55-0.70%, Mn: 1.45-1.55%, V: 0.12-0.14%, P + S is less than or equal to 0.035%, Cr is less than or equal to 0.3%, Ni is less than or equal to 0.05%, Cu is less than or equal to 0.15%, Mo is less than or equal to 0.05%, As is less than or equal to 0.06%, and the balance is Fe;
the method comprises the following steps:
s1: smelting molten iron, steelmaking and refining molten steel:
adding molten iron and scrap steel into a converter according to the weight ratio of 10: 1-1.5 for converting for 10-15 min, and controlling the carbon content at the end point to be more than or equal to 0.08% and the temperature at the end point to be less than or equal to 1680 ℃ after converting; adding ferrosilicon, silicomanganese and vanadium-nitrogen alloy in the tapping process, carrying out deoxidation alloying operation and molten steel refining, and then sending to continuous casting and pouring;
s2: continuous casting:
continuous casting and whole-process protective casting are adopted, wherein the liquidus temperature of molten steel is 1505-1510 ℃, the superheat degree of the molten steel of a tundish is preferably controlled at 15-25 ℃, the normal temperature of the molten steel of the tundish is 1515-;
s3: heating and rolling process:
heating the casting blank to 1050-1100 ℃, controlling the initial rolling temperature to 1040-1090 ℃, adopting a pre-water-penetrating process before a finishing mill group, and controlling the water supply amount to 50-150 m3The cooling time is 0.5-1.5 s, the water inlet temperature is less than or equal to 35 ℃, the water outlet temperature is less than 55 ℃, the surface temperature of the steel part after pre-water-through cooling is 850-950 ℃, and the temperature after pre-water-through cooling is the final rolling temperature; and (3) allowing the steel piece to enter a cooling bed through a conveying roller way, performing air cooling at the temperature of 700-800 ℃, cooling, performing fixed-length shearing, inspecting and warehousing.
2. The preparation method of the HRB600 high-strength aseismic reinforcement as claimed in claim 1, wherein: the molten iron in the step S1 comprises the following chemical components in percentage by mass: more than or equal to 4.0 percent of C, less than or equal to 0.6 percent of Si and Ti, more than or equal to 0.25 percent of V, less than or equal to 0.2 percent of P, less than or equal to 0.1 percent of S, less than or equal to 0.7 percent of slag, and the balance of Fe.
3. The preparation method of the HRB600 high-strength aseismic reinforcement as claimed in claim 1, wherein: in the step S1, the S content of the molten iron fed into the furnace is controlled to be less than or equal to 0.045%, and the temperature is controlled to be more than or equal to 1250 ℃.
4. The preparation method of the HRB600 high-strength aseismic reinforcement as claimed in claim 1, wherein: in the step S1, the S content of the semisteel is controlled to be less than or equal to 0.045%, and the temperature is controlled to be more than or equal to 1320 ℃.
5. The preparation method of the HRB600 high-strength aseismic reinforcement as claimed in claim 1, wherein: and in the step S1, the tapping method adopts slag stopping tapping, wherein the slag stopping tapping refers to that the furnace is immediately lifted when slag appears at the tapping hole, and the slag discharging amount is strictly controlled: the thickness of the slag layer of the steel ladle is less than or equal to 50mm, and the steel ladle adopts whole-process bottom blowing nitrogen in the tapping process.
6. The preparation method of the HRB600 high-strength aseismic reinforcement as claimed in claim 1, wherein: and in the step S1, the adding temperature of the silicon-iron alloy and the silicon-manganese alloy is above 200 ℃, the adding time of the silicon-iron alloy, the silicon-manganese alloy and the vanadium-nitrogen alloy is the time when the molten steel amount reaches the steel ladle 1/4, the silicon-iron alloy, the silicon-manganese alloy and the vanadium-nitrogen alloy are added into the steel ladle along with the tapping molten steel, and the adding is finished when the molten steel amount reaches the steel ladle 2/3.
7. The preparation method of the HRB600 high-strength aseismic reinforcement as claimed in claim 1, wherein: and the molten steel refining procedure in the step S1 comprises ladle bottom argon blowing and LF furnace refining.
8. The preparation method of the HRB600 high-strength aseismic reinforcement as claimed in claim 1, wherein: and the height of the liquid level of the molten steel in the tundish in the step S2 is controlled to be between 500mm and 800 mm.
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