CN114686764B - Low-relaxation ultrahigh-strength finish-rolled twisted steel and preparation method thereof - Google Patents
Low-relaxation ultrahigh-strength finish-rolled twisted steel and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 81
- 239000010959 steel Substances 0.000 title claims abstract description 81
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 30
- 238000005260 corrosion Methods 0.000 claims abstract description 19
- 230000007797 corrosion Effects 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 15
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 23
- 238000009749 continuous casting Methods 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
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- 208000016261 weight loss Diseases 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 21
- 239000011572 manganese Substances 0.000 description 15
- 229910052742 iron Inorganic materials 0.000 description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
- 229910052735 hafnium Inorganic materials 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 229910052720 vanadium Inorganic materials 0.000 description 5
- 229910052726 zirconium Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
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- 230000003628 erosive effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
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- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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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
-
- 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention belongs to the technical field of twisted steel production, and particularly relates to a preparation method of a low-relaxation ultrahigh-strength finish-rolled twisted steel. The invention relates to a low-relaxation ultra-high-strength finish rolling twisted steel, which comprises the following chemical components in percentage by mass: 0.24-0.50% of C, 1.3-2.0% of Si, 0.5-1.4% of Mn, 0.07-0.14% of V, 0.10-0.21% of Nb0.01-0.04% of B, 0.1-0.2% of Ni, 0.10-0.15% of Mo, 0.1-0.2% of Hf, 0.02-0.05% of Zr, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the balance of Fe and inevitable impurities, and the formula is satisfied: 0.23% to 0.55[ Ni ] + [ Mo ] +0.27[ Hf ] +0.1[ Zr ] to 0.25%. The finish-rolled twisted steel provided by the invention can realize the mechanical properties of the steel bar such as strength, toughness and the like, and effectively improve the corrosion resistance of the steel bar.
Description
Technical Field
The invention belongs to the technical field of twisted steel production, and particularly relates to a preparation method of a low-relaxation ultrahigh-strength finish-rolled twisted steel.
Background
The low-relaxation finish-rolled twisted steel bar is also called a twisted steel bar for low-relaxation prestressed concrete, and is mainly used for manufacturing concrete products with high strength and in a nut connection mode for the steel bar, such as projects of nuclear power plants, hydropower stations, tunnels, high-speed railways and the like. Wherein the specifications of phi 25mm and phi 32mm are the maximum requirements. The finish rolling thread reinforcing steel bar is characterized in that a whole reinforcing steel bar is rolled with a large-diameter high-precision straight reinforcing steel bar with external threads, a connector with threads can be screwed on any section of the reinforcing steel bar for connection, or a thread cap is screwed on the reinforcing steel bar for anchoring, the finish rolling thread reinforcing steel bar has the characteristics of simple and convenient connection and anchoring, strong adhesion and the like, and the product avoids the fracture caused by internal stress, unstable organization and the like caused by welding due to the fact that a welding process is omitted, so that the product has large market demand at present and high added value of products.
However, although the existing finish-rolled twisted steel has better mechanical properties, the corrosion resistance is poorer, the application effect in a corrosive environment is poorer, in order to improve the corrosion resistance of the steel, a large amount of alloy elements such as Cr, Ni and Mo are generally added, but the addition of a large amount of alloy elements not only increases the production cost, but also influences the mechanical properties of the steel, so that the problem of considering both the mechanical properties and the corrosion resistance of the steel is solved.
Disclosure of Invention
The invention aims to solve the problem that the mechanical property and the corrosion property of the steel bar cannot be considered at the same time in the conventional finish-rolled twisted steel bar, and thus provides a low-relaxation ultrahigh-strength finish-rolled twisted steel bar and a preparation method thereof.
The invention adopts the following technical scheme:
a low-relaxation ultra-high-strength finish-rolled threaded steel bar comprises the following chemical components in percentage by mass: 0.24-0.50% of C, 1.3-2.0% of Si, 0.5-1.4% of Mn, 0.07-0.14% of V, 0.10-0.21% of Nb, 0.01-0.04% of B, 0.1-0.2% of Ni, 0.10-0.15% of Mo, 0.1-0.2% of Hf, 0.02-0.05% of Zr, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the balance of Fe and inevitable impurities, and the formula is satisfied: 0.23% to 0.55[ Ni ] + [ Mo ] +0.27[ Hf ] +0.1[ Zr ] to 0.25%, representing the mass fraction of the corresponding elements in units.
The invention also provides a preparation method of the low-relaxation ultrahigh-strength finish-rolled twisted steel, which comprises the following steps:
1) smelting and continuously casting the molten steel to obtain a continuous casting blank;
2) and heating the continuous casting billet, continuously rolling, air-cooling to 820-plus-850 ℃, then water-cooling to 450-plus-minus-460 ℃, and finally air-cooling to room temperature to obtain the steel bar.
It should be noted that the step of smelting molten steel in the present invention is a conventional step in the art, and is not described herein again, for example, molten steel is smelted by molten iron pre-desulfurization, converter smelting, AOD furnace refining, and LF furnace refining.
Preferably, the chemical components of the continuous casting slab are as follows by mass percent: 0.24-0.50% of C, 1.3-2.0% of Si, 0.5-1.4% of Mn, 0.07-0.14% of V, 0.10-0.21% of Nb, 0.01-0.04% of B, 0.1-0.2% of Ni, 0.10-0.15% of Mo, 0.1-0.2% of Hf, 0.02-0.05% of Zr, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the balance of Fe and inevitable impurities, and the formula is satisfied: 0.2% to 0.55[ Ni ] + [ Mo ] +0.27[ Hf ] +0.1[ Zr ] to 0.3%, representing the mass fraction of the corresponding elements in units.
Preferably, the heating temperature in step 2) is 1130-1150 ℃.
Preferably, in the continuous rolling step, the starting rolling temperature is 1120-1140 ℃ and the finishing rolling temperature is 960-1120 ℃.
Preferably, the diameter of the twisted steel bar is 25mm or 32 mm.
Preferably, the yield strength of the steel bar is more than or equal to 785MPa, and the tensile strength is more than or equal to 980 MPa.
Preferably, the elongation after fracture of the steel bar is more than or equal to 12 percent, and the maximum force total elongation is more than or equal to 4.5 percent.
Preferably, in a salt spray corrosion test, the average weight loss corrosion rate of the steel bar is 0.06-0.08 g/(m) 2 ·h)。
The content of carbon in steel is increased, so that the tensile strength is improved, but the carbon is not beneficial to shaping, and the carbon content is 0.24-0.50%, so that the tensile strength of finish rolling deformed steel bar is improved.
The silicon can be dissolved in ferrite and austenite to improve the hardness and strength of the deformed steel bar, but when the content of the silicon in the deformed steel bar is too high, the plasticity and toughness of the steel bar are obviously reduced, and the invention finds that the silicon content is 1.3-2% to be beneficial to improving the performance of the deformed steel bar.
Manganese can improve the hardness and the strength of ferrite and austenite in steel, is a carbide forming element, and plays a role in refining pearlite due to the fact that the critical transformation temperature of manganese in steel is reduced, and also indirectly plays a role in improving the strength of pearlite steel.
The vanadium can refine structure crystal grains and improve the strength and the toughness, and the carbide formed by the vanadium and the carbon can improve the hydrogen corrosion resistance under high temperature and high pressure, and the invention discovers that when the content of the vanadium is 0.07-0.14 percent, the good strength and the toughness and the higher hydrogen corrosion resistance can be realized.
Boron can be used to strengthen the grain boundaries. Nb can improve the recrystallization temperature of the material, prevent the growth of austenite grains and refine ferrite grains.
Phosphorus is generally a harmful element in steel, increases cold brittleness of steel, reduces plasticity, and deteriorates cold bending properties, so that the phosphorus content in steel is generally required to be less than 0.035%, and higher quality steel is required to be lower.
Sulfur is severely segregated in steel, deteriorates the quality of steel, can reduce the plasticity of steel at high temperatures, and is a harmful element which exists in the form of FeS having a lower melting point.
Has the advantages that:
the invention provides a low-relaxation ultra-high-strength finish rolling twisted steel, which comprises the following chemical components in percentage by mass: 0.24-0.50% of C, 1.3-2.0% of Si, 0.5-1.4% of Mn, 0.07-0.14% of V, 0.10-0.21% of Nb, 0.01-0.04% of B, 0.1-0.2% of Ni, 0.10-0.15% of Mo, 0.1-0.2% of Hf, 0.02-0.05% of Zr, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the balance of Fe and inevitable impurities, and the formula is satisfied: 0.23% to 0.55[ Ni ]]+[Mo]+0.27[Hf]+0.1[Zr]Less than or equal to 0.25 percent. The invention controls C, Si, Mn, V, Nb and B in specific content range by optimizing the chemical composition of the steel bar, simultaneously adds specific amount of Ni, Mo, Hf and Zr, and controls the relation of Ni, Mo, Hf and Zr to be 0.23-0.55 [ Ni, Mo, Hf and Zr are]+[Mo]+0.27[Hf]+0.1[Zr]The content of Ni, Mo, Hf and Zr in the steel is controlled to be less than or equal to 0.25%, the type of inclusions in the steel is controlled by controlling the specific relation, the phase change effect of intragranular ferrite is promoted, crystal grains are refined, and the compactness and the corrosion resistance of the steel bar are improved. According to the invention, the Ni, Mo, Hf and Zr in the specific relation ratio are controlled, and the specific amounts of C, Si, Mn, V, Nb and B are matched, so that the mechanical properties of the steel bar such as strength, toughness and the like can be realized, and the corrosion resistance of the steel bar can be effectively improved, and through determination, the yield strength of the twisted steel bar provided by the invention is more than or equal to 785MPa, the tensile strength is more than or equal to 980MPa, the elongation after fracture is more than or equal to 12%, the total elongation of maximum force is more than or equal to 4.5%, and the corrosion resistance in salt spray is improvedIn an erosion test, the average weight loss erosion rate of the steel bar is 0.06-0.08 g/(m) 2 ·h)。
Furthermore, the preparation method of the finish rolling twisted steel provided by the invention does not directly carry out water cooling treatment after continuous rolling, but firstly carries out air cooling to specific 820-.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The embodiment provides a low-relaxation ultra-high-strength finish-rolled twisted steel, which comprises the following chemical components in percentage by mass: 0.45% of C, 1.85% of Si, 1.4% of Mn, 0.14% of V, 0.15% of Nb, 0.03% of B, 0.12% of Ni, 0.15% of Mo, 0.11% of Hf, 0.03% of Zr, 0.025% of P, 0.025% of S, and the balance of iron and inevitable impurities.
The preparation method of the steel bar comprises the following steps:
1) weighing the raw materials according to a formula ratio, melting, smelting, and continuously casting the smelted molten steel to obtain a continuous casting billet, wherein the continuous casting billet comprises the following chemical components in percentage by mass: 0.45% of C, 1.85% of Si, 1.4% of Mn, 0.14% of V, 0.15% of Nb, 0.03% of B, 0.12% of Ni, 0.15% of Mo, 0.11% of Hf, 0.03% of Zr, 0.025% of P, 0.025% of S, and the balance of iron and inevitable impurities;
2) heating the continuous casting slab to 1140 ℃ in a heating furnace, then carrying out continuous rolling at the initial rolling temperature of 1130 ℃ and the final rolling temperature of 980 ℃, air-cooling to 830 ℃ after rolling, then carrying out water cooling to 450 ℃ by adopting an intermittent water cooling mode, and finally air-cooling to room temperature to obtain the steel bar.
Example 2
The embodiment provides a low-relaxation ultra-high-strength finish-rolled twisted steel, which comprises the following chemical components in percentage by mass: 0.4% of C, 1.92% of Si, 1.2% of Mn, 0.12% of V, 0.18% of Nb, 0.04% of B, 0.12% of Ni, 0.15% of Mo, 0.11% of Hf, 0.03% of Zr, 0.025% of P, 0.025% of S, and the balance of iron and inevitable impurities.
The preparation method of the steel bar comprises the following steps:
1) weighing the raw materials according to a formula ratio, melting, smelting, and continuously casting the smelted molten steel to obtain a continuous casting billet, wherein the continuous casting billet comprises the following chemical components in percentage by mass: 0.4% of C, 1.92% of Si, 1.2% of Mn, 0.12% of V, 0.18% of Nb, 0.04% of B, 0.12% of Ni, 0.15% of Mo, 0.11% of Hf, 0.03% of Zr, 0.025% of P, 0.025% of S, and the balance of iron and inevitable impurities;
2) heating the continuous casting slab to 1135 ℃ in a heating furnace, then carrying out continuous rolling at the initial rolling temperature of 1120 ℃ and the final rolling temperature of 960 ℃, air-cooling to 850 ℃ after rolling, then carrying out water cooling to 455 ℃ in an intermittent water cooling mode, and finally air-cooling to room temperature to obtain the steel bar.
Example 3
The embodiment provides a low-relaxation ultra-high-strength finish-rolled twisted steel, which comprises the following chemical components in percentage by mass: 0.25% of C, 1.4% of Si, 0.8% of Mn, 0.1% of V, 0.15% of Nb, 0.02% of B, 0.18% of Ni, 0.15% of Mo, 0.11% of Hf, 0.03% of Zr, 0.025% of P, 0.028% of S, and the balance of iron and inevitable impurities.
The preparation method of the steel bar comprises the following steps:
1) weighing the raw materials according to a formula ratio, melting, smelting, and continuously casting the smelted molten steel to obtain a continuous casting billet, wherein the continuous casting billet comprises the following chemical components in percentage by mass: 0.25% of C, 1.4% of Si, 0.8% of Mn, 0.1% of V, 0.15% of Nb, 0.02% of B, 0.18% of Ni, 0.15% of Mo, 0.11% of Hf, 0.03% of Zr, 0.025% of P, 0.028% of S, and the balance of iron and inevitable impurities;
2) heating the continuous casting slab in a heating furnace to 1145 ℃, then carrying out continuous rolling, wherein the initial rolling temperature is 1125 ℃, the final rolling temperature is 970 ℃, air-cooling to 840 ℃ after rolling, then adopting an intermittent water-cooling mode to carry out water-cooling to 450 ℃, and finally carrying out air-cooling to room temperature to obtain the reinforcing steel bar.
Comparative example 1
The comparative example provides a low-relaxation ultra-high-strength finish-rolled twisted steel, and compared with example 1, the difference is that the steel comprises the following chemical components in percentage by mass: 0.45% of C, 1.85% of Si, 1.4% of Mn, 0.14% of V, 0.15% of Nb, 0.03% of B, 0.2% of Ni, 0.1% of Mo, 0.2% of Hf, 0.02% of Zr, 0.025% of P, 0.025% of S, and the balance of iron and inevitable impurities.
Comparative example 2
The comparative example provides a low-relaxation ultra-high-strength finish-rolled twisted steel, and compared with example 1, the difference is that the steel comprises the following chemical components in percentage by mass: 0.45% of C, 1.85% of Si, 1.4% of Mn, 0.14% of V, 0.15% of Nb, 0.03% of B, 0.3% of Ni, 0.03% of Mo, 0.03% of Hf, 0.11% of Zr, 0.025% of P, 0.025% of S, and the balance of iron and inevitable impurities.
Comparative example 3
The comparative example provides a low-relaxation ultra-high-strength finish-rolled twisted steel, compared with example 1, the difference is that in step 2), a continuous casting billet is heated to 1140 ℃ in a heating furnace, then continuous rolling is carried out, the initial rolling temperature is 1130 ℃, the final rolling temperature is 980 ℃, water cooling is carried out to 450 ℃ in an intermittent water cooling mode after rolling, and finally air cooling is carried out to room temperature to obtain the twisted steel.
Test example 1
The reinforcing steel bars prepared in the above examples and comparative examples were subjected to mechanical property tests, and the test results are shown in table 1.
TABLE 1 mechanical Property testing of reinforcing bars
Test example 2
The salt spray corrosion test of the steel bars prepared in the above example 1 and comparative example includes the specific steps of placing the steel bar sample for test in a salt spray test box, the test is performed according to the GB/T10125 artificial atmosphere corrosion test-salt spray corrosion test, the solution is 2.0 wt% NaCl aqueous solution, the pH is 6.8, the solution temperature is 35 ℃, the test is continued, and the average weightless corrosion rate at 144h is obtained, and the test results are shown in Table 2.
TABLE 2 Corrosion resistance of reinforcing bars
The above detailed description is directed to one of the possible embodiments of the present invention, which is not intended to limit the scope of the invention, but rather the scope of the invention is intended to include all equivalent implementations or modifications without departing from the scope of the invention.
Claims (9)
1. The low-relaxation ultra-high-strength finish-rolled threaded steel bar is characterized by comprising the following chemical components in percentage by mass: 0.24-0.50% of C, 1.3-2.0% of Si, 0.5-1.4% of Mn, 0.07-0.14% of V, 0.10-0.21% of Nb, 0.01-0.04% of B, 0.1-0.2% of Ni, 0.10-0.15% of Mo, 0.1-0.2% of Hf, 0.02-0.05% of Zr, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the balance of Fe and inevitable impurities, and the formula is satisfied: 0.23% to 0.55[ Ni ] + [ Mo ] +0.27[ Hf ] +0.1[ Zr ] to 0.25%, representing the mass fraction of the corresponding elements in units.
2. A method of manufacturing a low-slack ultra-high-strength finish-rolled rebar as recited in claim 1, comprising the steps of:
1) smelting and continuously casting the molten steel to obtain a continuous casting blank;
2) and heating the continuous casting billet, continuously rolling, air-cooling to 820-plus-850 ℃, then water-cooling to 450-plus-minus-460 ℃, and finally air-cooling to room temperature to obtain the steel bar.
3. The preparation method of claim 2, wherein the chemical components of the continuous casting slab are as follows in mass percent: 0.24-0.50% of C, 1.3-2.0% of Si, 0.5-1.4% of Mn, 0.07-0.14% of V, 0.10-0.21% of Nb, 0.01-0.04% of B, 0.1-0.2% of Ni, 0.10-0.15% of Mo, 0.1-0.2% of Hf, 0.02-0.05% of Zr, less than or equal to 0.035% of P, less than or equal to 0.035% of S, and the balance of Fe and inevitable impurities, and the formula is satisfied: 0.23% to 0.55[ Ni ] + [ Mo ] +0.27[ Hf ] +0.1[ Zr ] to 0.25%, representing the mass fraction of the corresponding elements in units.
4. The method according to claim 2 or 3, wherein the heating temperature in step 2) is 1130-1150 ℃.
5. The method as claimed in claim 2 or 3, wherein the rolling temperature in the continuous rolling step is 1120-1140 ℃ and the finishing temperature is 960-1120 ℃.
6. A method of manufacturing as claimed in claim 2 or 3, wherein the diameter of the rebar is 25mm or 32 mm.
7. The preparation method of claim 2, wherein the yield strength of the steel bar is 785MPa or more, and the tensile strength is 980MPa or more.
8. The method as claimed in claim 2, wherein the post-fracture elongation of the steel bar is not less than 12%, and the maximum force total elongation is not less than 4.5%.
9. The preparation method of claim 2, wherein the average weight-loss corrosion rate of the steel bar in a salt spray corrosion test is 0.06-0.08 g/(m) 2 · h)。
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| JP4369612B2 (en) * | 2000-11-13 | 2009-11-25 | 新日本製鐵株式会社 | Steel plate for low quenching or normalizing type low alloy boiler steel pipe excellent in toughness, and method of manufacturing steel pipe using the same |
| JP4091894B2 (en) * | 2003-04-14 | 2008-05-28 | 新日本製鐵株式会社 | High-strength steel sheet excellent in hydrogen embrittlement resistance, weldability, hole expansibility and ductility, and method for producing the same |
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Denomination of invention: A low relaxation ultra-high strength precision rolled threaded steel bar and its preparation method Effective date of registration: 20231212 Granted publication date: 20220913 Pledgee: Bank of Xiamen Limited by Share Ltd. Zhangzhou branch Pledgor: FUJIAN SANBAO STEEL Co.,Ltd. Registration number: Y2023980071032 |
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