CN114686764A - 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 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 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 18
- 230000007797 corrosion Effects 0.000 claims abstract description 18
- 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
- 238000005266 casting Methods 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 230000004580 weight loss Effects 0.000 claims description 4
- 208000016261 weight loss Diseases 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 22
- 239000011572 manganese Substances 0.000 description 15
- 229910052742 iron Inorganic materials 0.000 description 10
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 229910052750 molybdenum Inorganic materials 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910052735 hafnium Inorganic materials 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 229910052720 vanadium Inorganic materials 0.000 description 6
- 229910052726 zirconium Inorganic materials 0.000 description 6
- 229910052748 manganese Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052796 boron 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
- 229910052758 niobium Inorganic materials 0.000 description 3
- 229910052698 phosphorus 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
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910001562 pearlite 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
- 239000005864 Sulphur Substances 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
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 230000009466 transformation Effects 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
-
- 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 production of twisted steel, and particularly relates to a preparation method of 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 mechanical properties such as strength, toughness and the like of the steel bar and effectively improve the corrosion resistance of the steel bar.
Description
Technical Field
The invention belongs to the technical field of production of twisted steel, and particularly relates to a preparation method of 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 specification requirements of phi 25mm and phi 32mm are the maximum. 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 poor, the application effect in a corrosive environment is poor, and in order to improve the corrosion resistance of the steel, a large amount of alloy elements such as Cr, Ni, Mo and the like are generally added, but the addition of a large amount of alloy elements not only increases the production cost, but also affects the mechanical properties of the steel, so that how to take into account the mechanical properties and the corrosion resistance of the steel becomes a big problem.
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 prior art, and 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 initial rolling temperature is 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 salt sprayIn an erosion test, the average weight loss erosion 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.
Sulphur is a harmful element in the form of FeS, which has a low melting point, and segregates heavily in steel, deteriorates the quality of the steel, and reduces the plasticity of the steel at high temperatures.
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 to 0.50 percent of C, 1.3 to 2.0 percent of Si, 0.5 to 1.4 percent of Mn, 0.07 to 0.14 percent of V, 0.10 to 0.21 percent of Nb, 0.01 to 0.04 percent of B, 0.1 to 0.2 percent of Ni, 0.10 to 0.15 percent of Mo,0.1 to 0.2 percent of Hf, 0.02 to 0.05 percent of Zr, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, and the balance of iron 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 a specific content range by optimizing the chemical components of the steel bar, simultaneously adds specific amounts of Ni, Mo, Hf and Zr, and controls the relationship of Ni, Mo, Hf and Zr to be 0.23-0.55 [ Ni, Mo, Hf and Zr ]]+[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 proportion are controlled, and the specific amounts of C, Si, Mn, V, Nb and B are matched to realize that the mechanical properties such as strength, toughness and the like of the steel bar are considered, and the corrosion resistance of the steel bar can be effectively improved at the same time, 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 in a salt spray corrosion test, the average weight loss corrosion rate of the steel bar is 0.06-0.08 g/(m & ltm & gt) & lt 0.08g & gt2·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 in a heating furnace to 1135 ℃, then carrying out continuous rolling at the beginning rolling temperature of 1120 ℃ and the final rolling temperature of 960 ℃, air-cooling to 850 ℃ after rolling, then carrying out water cooling to 455 ℃ by adopting an intermittent water cooling mode, and finally air-cooling to room temperature to obtain the reinforcing 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 rolling twisted steel, and 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 ℃, an intermittent water cooling mode is adopted to carry out water cooling to 450 ℃ after rolling, and finally air cooling is carried out to room temperature, so that the twisted steel is obtained.
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 was performed by placing the steel bar sample for test in a salt spray test box, and the test was performed according to GB/T10125 artificial atmosphere corrosion test-salt spray corrosion test, where the solution was 2.0 wt% NaCl aqueous solution, pH was 6.8, the solution temperature was 35 ℃, and the average weight loss corrosion rate at 144 hours was obtained by continuous test, and the test results are shown in table 2.
TABLE 2 Corrosion resistance of reinforcing bars
The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention should be included in the technical scope of the present 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 twisted steel bar according to 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: 0.2% to 0.55[ Ni ] + [ Mo ] +0.27[ Hf ] +0.1[ Zr ] to 0.3%, representing the mass fraction of the corresponding elements in units.
4. The method as claimed in 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 according to any one of claims 2 to 6, wherein the yield strength of the steel bar is 785MPa or more and the tensile strength is 980MPa or more.
8. The method according to any one of claims 2 to 7, 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 according to any one of claims 2 to 8, 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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| CN104975224A (en) * | 2010-03-04 | 2015-10-14 | 株式会社神户制钢所 | Seamless steel pipe of high-strength hollow spring |
| CN113227427A (en) * | 2018-12-18 | 2021-08-06 | Posco公司 | High-strength steel sheet having excellent ductility and workability, and method for producing same |
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Patent Citations (5)
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| JP2002146470A (en) * | 2000-11-13 | 2002-05-22 | Nippon Steel Corp | Low quenching or normalizing type low alloy steel sheet for boiler steel tube having excellent toughness and method for producing steel tube using the steel sheet |
| JP2004332099A (en) * | 2003-04-14 | 2004-11-25 | Nippon Steel Corp | High-strength thin steel sheet superior in hydrogen embrittlement resistance, weldability, hole-expandability, and ductility and manufacturing method therefor |
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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 |