WO2021128590A1 - 一种钢筋混凝土用600MPa级钢筋及其生产方法 - Google Patents

一种钢筋混凝土用600MPa级钢筋及其生产方法 Download PDF

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WO2021128590A1
WO2021128590A1 PCT/CN2020/078686 CN2020078686W WO2021128590A1 WO 2021128590 A1 WO2021128590 A1 WO 2021128590A1 CN 2020078686 W CN2020078686 W CN 2020078686W WO 2021128590 A1 WO2021128590 A1 WO 2021128590A1
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billet
steel
600mpa
rolling
reinforced concrete
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PCT/CN2020/078686
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English (en)
French (fr)
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马正洪
王云川
黄沁
王哲
彭家清
彭勇
周聪
包遵广
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江苏永钢集团有限公司
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08—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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F27/00—Making wire network, i.e. wire nets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter

Definitions

  • the invention relates to the technical field of steel bar manufacturing technology, in particular to a 600MPa grade steel bar for reinforced concrete and a production method thereof.
  • the embodiment of the present invention provides a 600MPa-grade steel bar for reinforced concrete and a production method thereof, which solves the technical problem that the microalloying route is adopted in the prior art, and the strength requirement is difficult to achieve by relying on a single production process route, and there is a technical problem of high cost.
  • the embodiments of the present application are proposed to provide a 600MPa grade steel bar for reinforced concrete and a production method thereof.
  • the present invention provides a method for producing 600MPa-grade steel bars for reinforced concrete.
  • the method includes: refining raw materials for steelmaking through a converter to obtain crude molten steel; and passing the crude molten steel through a refining furnace Refining to obtain refined molten steel; rolling the refined molten steel through a continuous caster to obtain a continuous cast steel billet; after the continuous casting billet is transported to a heating furnace for heating, it enters the rack rough rolling train Rough-rolling operation to obtain a rough-rolled steel billet; after shearing and breaking the rough-rolled steel billet, the rough-rolled steel billet enters the middle rolling mill of the stand for intermediate rolling operation to obtain the intermediate-rolled steel billet; After finishing rolling, it is sheared and broken, and then enters the finishing mill of the stand for finishing rolling to obtain a finished rolled steel billet; after cooling and shearing, the finished rolled steel billet is finished and put into storage.
  • the heating furnace for heating before conveying the continuous casting billet to the heating furnace for heating, it includes: inspecting the continuous casting billet; and conveying the continuous casting billet that has passed the inspection to the heating furnace through a conveying roller table. Heat it up.
  • the shearing and breaking of the rough-rolled steel billet includes: performing bending arm shearing of the billet head and the billet tail on the rough-rolled steel billet, and then performing the breaking.
  • the pre-water cooling section of the middle-rolled steel billet is subjected to shearing and breaking after low-temperature finish rolling is realized, including: performing the rotary shearing of the billet head and the billet tail on the finishing-rolled billet, and then performing Shattered.
  • the finishing and storage includes: controlling cooling of the water cooling section of the finishing rolled steel billet; and after cooling, the finished rolled steel billet is sheared in sections by a double-length shear After the sheared finish-rolled steel billet is naturally cooled by a cooling bed, it is subjected to cold cut to length cutting; the sheared steel billet is finished and put into storage.
  • the finishing and warehousing of the steel billets after the shearing treatment includes: short-length rejection of the steel billets; counting and finishing the selected steel billets after rejection; and bundling and weighing the finished steel billets. After heavy, it will be transported into the warehouse by hoisting.
  • the V/N in the steel raw material is 3.49-3.83.
  • the main component of the nitrogen intensifier in the steel-making raw material is ferrosilicon nitride.
  • the main component of the nitrogen intensifier in the steel-making raw material is silicon manganese nitride.
  • the main component of the nitrogen increasing agent in the steel-making raw material is ferromanganese nitride.
  • the Nb content in the steel-making raw materials accounts for 0.015-0.025%.
  • the present invention provides a 600MPa-grade steel bar for reinforced concrete, which is suitable for the production method.
  • the proportion of the 600MPa-grade steel bar for reinforced concrete is: C: 0.21-0.26%, Mn: 1.40-1.80 %, Si: 0.65-0.84%, V: 0.08-0.11%, S ⁇ 0.020%, P ⁇ 0.025%, N: 0.023-0.029%, Nb: 0.015-0.025%, the rest is Fe and unavoidable impurities.
  • the V/N in the proportion of the 600MPa grade steel bars for the reinforced concrete is not more than 5.
  • the crystal grains of the 600MPa grade steel bars for reinforced concrete are not more than 4 ⁇ m.
  • the strength of the 600MPa grade steel bars for reinforced concrete is 600MPa.
  • the main component of the nitrogen intensifier in the 600MPa-grade steel bars for reinforced concrete is ferrosilicon nitride.
  • the main component of the nitrogen intensifier in the 600MPa-grade steel bars for reinforced concrete is silicon manganese nitride.
  • the main component of the nitrogen-enhancing agent in the 600MPa-grade steel bars for reinforced concrete is ferromanganese nitride.
  • An embodiment of the present invention provides a method for producing 600MPa-grade steel bars for reinforced concrete, the method comprising: refining raw materials for steelmaking through a converter to obtain crude molten steel; and passing the crude molten steel through a refining furnace Refining to obtain refined molten steel; rolling the refined molten steel through a continuous caster to obtain a continuous cast steel billet; after the continuous casting billet is transported to a heating furnace for heating, it enters the rack rough rolling train Rough-rolling operation to obtain a rough-rolled steel billet; after shearing and breaking the rough-rolled steel billet, the rough-rolled steel slab enters the middle rolling mill of the stand for intermediate rolling operation to obtain the intermediate-rolled steel slab; pre-water cooling section of the intermediate-rolled steel slab realizes low temperature After finishing rolling, it is sheared and broken, and then enters the finishing mill of the stand for finishing rolling to obtain a finished rolled steel billet; after cooling and shearing, the finished rolled steel billet is finished and put into storage.
  • An embodiment of the present invention provides a 600MPa-grade steel bar for reinforced concrete.
  • the proportions of the 600MPa-grade steel bar for reinforced concrete are: C: 0.21-0.26%, Mn: 1.40-1.80%, Si: 0.65-0.84% , V: 0.08-0.11%, S ⁇ 0.020%, P ⁇ 0.025%, N: 0.023-0.029%, Nb: 0.015-0.025%, the rest is Fe and unavoidable impurities.
  • the specially designed Nb and V composite component system meets the requirements of 600MPa fine-grained high-strength earthquake resistance. Through the adjustment of process and composition, the rolled steel bar meets the requirements of 600MPa high-strength use, and the amount of steel used is more than 30.
  • Fig. 1 is a schematic flow diagram of a method for producing 600MPa-grade steel bars for reinforced concrete in an embodiment of the present invention.
  • the embodiment of the present invention provides a 600MPa-grade steel bar for reinforced concrete and a production method thereof, which is used to solve the technical problem that the microalloying route adopted in the prior art is difficult to meet the strength requirement by a single production process route, and there is a technical problem of high cost. .
  • the intermediate rolling mill group performs the intermediate rolling operation to obtain the intermediate-rolled steel billet; after the intermediate-rolled steel slab is subjected to the pre-water cooling section to achieve low-temperature finish rolling, it is sheared and broken, and then enters the stand finishing mill for the finishing operation to obtain the refined Rolled steel billets; after cooling and shearing the finished steel billets, they are finished and put into storage.
  • the LF is the abbreviation of (LADLE FURNACE), that is, the ladle refining furnace, which is the main out-of-furnace refining equipment in steel production.
  • LF furnace generally refers to the refining furnace in the steel industry. In fact, it is a special form of electric arc furnace.
  • the refining of the LF furnace mainly relies on the white slag in the barrel.
  • argon is blown into the barrel to stir and the molten steel passing through the primary furnace is heated by graphite electrodes to refine.
  • LF furnace can be matched with electric furnace to replace the reduction period of electric furnace, and it can also be matched with oxygen converter to produce high-quality alloy steel.
  • the LF furnace is also an indispensable equipment for controlling the composition, temperature and preserving molten steel in the continuous casting workshop, especially the alloy steel continuous casting production line. Therefore, the emergence of LF furnace has formed a new combined production line of LD-LF-RH-CC (continuous casting) for the production of high-quality steel.
  • the reduction refining of steel on this combined production line is mainly done by LF furnace.
  • the steel grades processed by the LF furnace involve almost all steel grades from special steel to ordinary steel. Different process operating systems can be used in production depending on the needs of quality control. Among various secondary refining equipment, LF furnace has a high comprehensive cost performance.
  • Fig. 1 is a schematic flow diagram of a method for producing 600MPa-grade steel bars for reinforced concrete in an embodiment of the present invention. As shown in Figure 1, an embodiment of the present invention provides a method for producing 600MPa-grade steel bars for reinforced concrete, the method including:
  • Step 10 Refining raw materials for steelmaking through a converter to obtain crude molten steel.
  • Step 20 Refining the crude molten steel through a refining furnace to obtain refined molten steel.
  • Step 30 Roll the refined molten steel by a continuous caster to obtain a continuous cast steel billet.
  • Step 40 After the continuous casting steel slab is transported to the heating furnace for heating, it enters the rack rough rolling train for rough rolling operation to obtain the rough rolled steel slab.
  • conveying the continuous casting billet to a heating furnace for heating includes: inspecting the continuous casting billet; and conveying the continuous casting billet that has passed the inspection to the heating furnace through a conveying roller table. Heat it up.
  • Step 50 After the rough-rolled steel billet is cut and broken, it enters the middle-rolling mill of the stand for middle-rolling operation to obtain the middle-rolled steel billet.
  • the shearing and breaking of the rough-rolled steel billet includes: after the rough-rolled steel billet is subjected to bending arm shearing of the billet head and the billet tail, the breaking is performed.
  • Step 60 After the intermediate-rolled steel billet is subjected to a pre-water cooling section to achieve low-temperature finish rolling, it is sheared and broken, and then enters the stand finish rolling train for finishing rolling operations to obtain a finished steel billet.
  • the shearing and breaking are performed, including: performing rotary shearing of the finished-rolled steel slab after the slab head and the slab tail are sheared. Shattered.
  • Step 70 After cooling and shearing the finished steel billet, it is finished and put into storage.
  • the embodiment of the present invention uses the alloying method to produce 600MPa high-strength steel bars according to the same production process as the current low- and medium-strength steel bars. On the one hand, it can avoid the production line transformation and the series caused by this. Issues such as equipment transformation and cost input; on the other hand, it also helps new products to be produced and promoted quickly on a large scale.
  • the production equipment is modified according to the technical requirements of continuous temperature-controlled rolling in the whole process.
  • the processing technology route of the embodiment of the present invention is: Ergang 4-5# converter ⁇ LF refining furnace ⁇ 4-5# continuous casting machine ⁇ billet inspection ⁇ Heating furnace heating ⁇ 8-stand rough rolling mill ⁇ crank arm shearing head, tail trimming, breaking ⁇ 4-stand intermediate rolling mill ⁇ pre-water cooling section to achieve low-temperature finishing rolling ⁇ rotary shearing head, trimming tail, breaking ⁇ 6 Frame finishing mill ⁇ controlled cooling in the water-cooled section after rolling ⁇ double-length shear section cutting ⁇ cooling bed natural cooling ⁇ cold shear cut-to-length cutting ⁇ short-length removal ⁇ counting, finishing ⁇ bundling, weighing ⁇ hoisting, loading Library.
  • the process measures such as recrystallization, non-recrystallization and deformation induced ferrite mechanisms and controlled cooling after rolling are comprehensively used to achieve the control of grain growth and uniform organization purpose.
  • the process route is optimized, alloying is the main method, and the rolling process is supplemented, reducing product production costs, stabilizing product quality, product production technology is becoming more mature, and the company has the ability to continue to innovate, and the technical risk is minimal.
  • finishing and warehousing includes: controlling the cooling of the water-cooling section of the finish-rolling steel billet; after cooling, the finish-rolling steel billet is sheared in sections by a double-length shear After the sheared finish-rolled steel billet is naturally cooled by a cooling bed, it is subjected to cold cut to length cutting; the sheared steel billet is finished and put into storage.
  • finishing and warehousing of the steel billets after the shearing treatment includes: short-length rejection of the steel billets; counting and finishing the selected steel billets after rejection; and bundling and weighing the finished steel billets. After the weight is heavy, it is transported into the warehouse by hoisting.
  • the use of microalloy fine-grain strengthening, and then Crystal rolling, non-recrystallization rolling, deformation-induced ferrite mechanism distributes the temperature control at each stage, and through the continuous temperature control + deformation rolling process, the refinement and homogenization of the steel microstructure is realized.
  • process layout it overcomes the shortcomings of traditional processes. There is a temperature control section set in each unit, no recovery section setting is required, and various control mechanisms can be comprehensively used to meet the needs of controlled rolling with different specifications and compositions.
  • the refined slab After rolling, through technological measures such as controlled cooling, the refined slab is cooled to achieve the purpose of controlling grain growth and homogenizing the structure. It ensures the high strength of steel products, effectively saves more than 30% of steel consumption, greatly improves the current structure of construction products, and greatly improves economic benefits.
  • V/N in the steel-making raw materials is 3.49-3.83.
  • the main component of the nitrogen intensifier in the steel-making raw material is ferrosilicon nitride.
  • the main component of the nitrogen increasing agent in the steel-making raw material is silicon manganese nitride.
  • the main component of the nitrogen increasing agent in the steel-making raw material is ferromanganese nitride.
  • the Nb content in the steel-making raw materials accounts for 0.015-0.025%.
  • the method of adding alloying elements is mainly used in China to improve the mechanical properties of steel bars, and the solid solution strengthening mechanism, precipitation strengthening mechanism and fine-grain strengthening mechanism of alloying elements are used to improve the strength level of steel bars.
  • adding vanadium-nitrogen alloys for vanadium and nitrogen microalloying is recognized as an economical and effective method.
  • V/N ratio>5 which is much higher than its ideal ratio of 3.64. At this time, the strengthening effect of vanadium cannot be fully exerted.
  • niobium-vanadium composite strengthening mechanism Through the niobium-vanadium composite strengthening mechanism, the yield ratio and ultimate strength of the steel bar can be improved, and finally the amount of vanadium can be reduced, thereby saving valuables. Metal resources reduce production costs.
  • This technology adjusts the chemical composition and rolling process on the basis of ordinary steel bars to improve the comprehensive performance of the steel bars. After quenching and tempering, it reaches the requirements of various indexes of 600MPa high-performance steel bars.
  • the embodiment of the present invention provides a 600MPa-grade steel bar for reinforced concrete, which is suitable for the production method described in Example 1.
  • the proportion of the 600MPa-grade steel bar for reinforced concrete is: C: 0.21-0.26%, Mn: 1.40- 1.80%, Si: 0.65-0.84%, V: 0.08-0.11%, S ⁇ 0.020%, P ⁇ 0.025%, N: 0.023-0.029%, Nb: 0.015-0.025%, the rest is Fe and unavoidable impurities.
  • crystal grains of the 600MPa grade steel bars for reinforced concrete are not more than 4 ⁇ m.
  • the strength of the 600MPa grade steel bars for reinforced concrete is 600MPa.
  • the strength of the 600MPa-grade steel bar for reinforced concrete in the embodiment of the present invention is 600MPa, which meets the requirements of high-strength steel bars, and its chemical composition is C: 0.21-0.26% by weight, Mn: 1.40-1.80%, and Si: 0.65-0.84%, V: 0.08-0.11%, S ⁇ 0.020%, P ⁇ 0.025%, N: 0.023-0.029%, Nb: 0.015-0.025%, the rest is Fe and unavoidable impurities.
  • C is one of the most economical strengthening elements in steel. Through the control of C content, the strength of the material is ensured, solid solution strengthening, and yield strength are improved.
  • Si is a deoxidizing element, solid solution strengthening in steel to ensure the strength of steel.
  • Mn is a solid solution strengthening element, which improves the yield strength and ensures the strength and toughness.
  • P is an impurity element in steel, too high will reduce the weldability and formability of steel.
  • S is an impurity element in steel, which affects the low temperature toughness of steel.
  • Solid solution N can increase the strength, too high content will seriously deteriorate the plasticity and toughness of the material, especially for heat-treated high-strength steel.
  • Nb is a second phase forming element, which exerts a precipitation strengthening effect, and has the effect of suppressing the recovery of austenite and the growth of recrystallized grains during the hot rolling process, thereby making the ferrite phase a desired grain size.
  • the phase particles belong to the hard phase, which can increase the wear resistance of the matrix.
  • V is the second phase forming element, which plays a role of precipitation strengthening. A certain amount of V improves the strength of the incomplete recrystallization zone of the weld. Because in the existing HRB400 and HRB500 products, the content of common alloying elements such as C, Si, Mn, etc. is close to the upper limit of the GB1499.2 national industry standard. There is not much room for upward adjustment of C, Si, and Mn when developing HRB600. Good weldability is a prerequisite to ensure the universal application of products. In order to ensure processing performance and welding performance, national standards also have clear requirements for microstructure and carbon equivalent. Therefore, the microalloying route must be adopted, and the adopted grain refinement strengthening is based on the special process of controlled cooling after rolling to make the grains refined.
  • the embodiment of the present invention uses the alloying method to produce 600MPa high-strength steel bars according to the same production process as the current low- and medium-strength steel bars. On the one hand, it can avoid the production line transformation and the series caused by this. Issues such as equipment transformation and cost input; on the other hand, it also helps new products to be produced and promoted quickly on a large scale.
  • the mechanism of microalloy fine grain strengthening, recrystallization rolling, non-recrystallization rolling, and deformation induced ferrite is used to distribute
  • the temperature control at each stage achieves the refinement and homogenization of the steel microstructure through the continuous temperature control + deformation rolling process.
  • process layout it overcomes the shortcomings of traditional processes.
  • There is a temperature control section set in each unit no recovery section setting is required, and various control mechanisms can be comprehensively used to meet the needs of controlled rolling with different specifications and compositions.
  • the specially designed Nb and V composite component system to meet the requirements of 600MPa fine-grained high-strength earthquake resistance.
  • the rolled steel bar can meet the high-strength requirements of 600MPa, while saving more than 30 steel. Greatly improve the current structure of products used in construction, and enhance economic benefits. It solves the technical problem that the microalloying route in the prior art is difficult to meet the strength requirement by relying on a single production process route, and there is a technical problem of high cost.
  • V/N of the 600MPa-grade steel bars for reinforced concrete accounted for not more than 5.
  • V/N ratio of the 600MPa grade steel bars for reinforced concrete is 3.49-3.83.
  • the main component of the nitrogen-enhancing agent in the 600MPa-grade steel bars for reinforced concrete is ferrosilicon nitride.
  • the main component of the nitrogen-enhancing agent in the 600MPa-grade steel bars for reinforced concrete is silicon-manganese nitride.
  • the main component of the nitrogen-enhancing agent in the 600MPa-grade steel bars for reinforced concrete is ferromanganese nitride.
  • the method of adding alloying elements is mainly used in China to improve the mechanical properties of steel bars, and the solid solution strengthening mechanism, precipitation strengthening mechanism and fine-grain strengthening mechanism of alloying elements are used to improve the strength level of steel bars.
  • adding vanadium-nitrogen alloy to vanadium and nitrogen microalloying is a recognized economical and effective method.
  • V/N ratio>5 which is much higher than its ideal ratio of 3.64. At this time, the strengthening effect of vanadium cannot be fully exerted.
  • niobium-vanadium composite strengthening mechanism Through the niobium-vanadium composite strengthening mechanism, the yield ratio and ultimate strength of the steel bar can be improved, and finally the amount of vanadium can be reduced, thereby saving valuables. Metal resources reduce production costs.
  • This technology adjusts the chemical composition and rolling process on the basis of ordinary steel bars to improve the comprehensive performance of the steel bars. After quenching and tempering, it reaches the requirements of various indexes of 600MPa high-performance steel bars.
  • An embodiment of the present invention provides a method for producing 600MPa-grade steel bars for reinforced concrete, the method comprising: refining raw materials for steelmaking through a converter to obtain crude molten steel; and passing the crude molten steel through a refining furnace Refining to obtain refined molten steel; rolling the refined molten steel through a continuous caster to obtain a continuous cast steel billet; after the continuous casting billet is transported to a heating furnace for heating, it enters the rack rough rolling train Rough-rolling operation to obtain a rough-rolled steel billet; after shearing and breaking the rough-rolled steel billet, the rough-rolled steel slab enters the middle rolling mill of the stand for intermediate rolling operation to obtain the intermediate-rolled steel slab; pre-water cooling section of the intermediate-rolled steel slab realizes low temperature After finishing rolling, it is sheared and broken, and then enters the finishing mill of the stand for finishing rolling to obtain a finished rolled steel billet; after cooling and shearing, the finished rolled steel billet is finished and put into storage.
  • An embodiment of the present invention provides a 600MPa-grade steel bar for reinforced concrete.
  • the proportions of the 600MPa-grade steel bar for reinforced concrete are: C: 0.21-0.26%, Mn: 1.40-1.80%, Si: 0.65-0.84% , V: 0.08-0.11%, S ⁇ 0.020%, P ⁇ 0.025%, N: 0.023-0.029%, Nb: 0.015-0.025%, the rest is Fe and unavoidable impurities.
  • the specially designed Nb and V composite component system meets the requirements of 600MPa fine-grained high-strength earthquake resistance. Through the adjustment of process and composition, the rolled steel bar meets the requirements of 600MPa high-strength use, and the amount of steel used is more than 30.

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Abstract

一种钢筋混凝土用600MPa级钢筋及其生产方法，包括：通过转炉对制钢原料进行炼制，获得粗炼钢水；通过精炼炉进行精炼，获得精炼钢水；通过连铸机进行轧制，获得连铸钢坯；输送至加热炉进行加热后，进入机架粗轧机组进行粗轧操作，获得粗轧钢坯；剪切、碎断后，进入机架中轧机组进行中轧操作，进行预水冷段实现低温精轧后，进行剪切、碎断，进入机架精轧机组进行精轧操作，对精轧钢坯进行冷却、剪切后，精整入库。解决依靠单一的生产工艺途径很难达到强度要求，存在成本高的技术问题。达到在普通钢筋的基础上调整化学成分和轧制工艺，满足高性能钢筋的各项指标要求，形成了稳定的工业化轧制技术，降低成本提高收益的技术效果。

Description

一种钢筋混凝土用600MPa级钢筋及其生产方法 技术领域
本发明涉及钢筋制造工艺技术领域，尤其涉及一种钢筋混凝土用600MPa级钢筋及其生产方法。
背景技术
目前市场上HRB400(E)、HRB500(E)钢筋已饱和，并且短期内不会出现改善情况，而600MPa级及以上高强度级别的抗震钢筋有市场，600MPa级高强度钢筋为目前国内高等级钢筋，广泛用于各种建筑结构，特别是大型、重型、轻型薄壁和高层建筑结构。与400MPa级钢筋相比，采用600MPa级及以上强度高强度钢筋可节约用钢量30％以上。其开发和应用还将会推动高性能节能环保型新材料的推广和应用，大大改善当前建筑用产品品种结构，为实现资源节约型、环境友好型企业提供有力支撑。
但本发明申请人发现现有技术至少存在如下技术问题：
现有技术中采用微合金化路线，依靠单一的生产工艺途径很难达到强度要求，存在成本高的技术问题。
发明内容
本发明实施例提供了一种钢筋混凝土用600MPa级钢筋及其生产方法，解决了现有技术中采用微合金化路线，依靠单一的生产工艺途径很难达到强度要求，存在成本高的技术问题。
鉴于上述问题，提出了本申请实施例以便提供一种钢筋混凝土用600MPa级钢筋及其生产方法。
第一方面，本发明提供了一种钢筋混凝土用600MPa级钢筋生产方法，所 述方法包括：通过转炉对制钢原料进行炼制，获得粗炼钢水；将所述粗炼钢水通过精炼炉进行精炼，获得精炼钢水；通过连铸机对所述精炼钢水进行轧制，获得连铸钢坯；将所述连铸钢坯输送至加热炉进行加热后，进入机架粗轧机组进行粗轧操作，获得粗轧钢坯；对所述粗轧钢坯通过剪切、碎断后，进入机架中轧机组进行中轧操作，获得中轧钢坯；对所述中轧钢坯进行预水冷段实现低温精轧后，进行剪切、碎断，进入机架精轧机组进行精轧操作，获得精轧钢坯；对所述精轧钢坯进行冷却、剪切后，精整入库。
优选的，所述将所述连铸钢坯输送至加热炉进行加热之前，包括：对所述连铸钢坯进行检验；将检验合格的所述连铸钢坯，通过传送辊道输送至所述加热炉进行加热。
优选的，所述对所述粗轧钢坯通过剪切、碎断，包括：对所述粗轧钢坯进行曲臂剪切钢坯头、剪切钢坯尾后，进行碎断。
优选的，所述对所述中轧钢坯进行预水冷段实现低温精轧后，进行剪切、碎断，包括：对所述精轧钢坯进行回转剪切钢坯头、剪切钢坯尾后，进行碎断。
优选的，对所述精轧钢坯进行冷却、剪切后，精整入库，包括：对所述精轧钢坯水冷段控制冷却；冷却后的所述精轧钢坯通过倍尺剪分段剪切；经剪切后的所述精轧钢坯进行冷床自然冷却后，进行冷剪定尺剪切；对剪切处理后的钢坯进行精整入库。
优选的，所述对剪切处理后的钢坯进行精整入库，包括：对所述钢坯进行短尺剔除；将剔除选择后的钢坯进行计数、精整；精整后的钢坯进行打捆、称重后，通过吊运入库。
优选的，在各轧钢机组之间均有控温段设置，不需进行回复段设置。
优选的，所述制钢原料中V/N为3.49-3.83。
优选的，所述制钢原料中的增氮剂主要成分为氮化硅铁。
优选的，所述制钢原料中的增氮剂主要成分为氮化硅锰。
优选的，所述制钢原料中的增氮剂主要成分为氮化锰铁。
优选的，所述制钢原料中Nb的含量占比为0.015-0.025％。
第二方面，本发明提供了一种钢筋混凝土用600MPa级钢筋，适用于所述的生产方法，所述钢筋混凝土用600MPa级钢筋成分占比为：C：0.21-0.26％、Mn：1.40-1.80％、Si：0.65-0.84％、V：0.08-0.11％、S≤0.020％、P≤0.025％、N：0.023-0.029％、Nb：0.015-0.025％，其余为Fe和不可避免的杂质。
优选的，所述钢筋混凝土用600MPa级钢筋成分占比中V/N不大于5。
优选的，所述钢筋混凝土用600MPa级钢筋成分占比中V/N为3.49-3.83。
优选的，所述钢筋混凝土用600MPa级钢筋中晶粒不大于4μm。
优选的，所述钢筋混凝土用600MPa级钢筋的强度为600MPa。
优选的，所述钢筋混凝土用600MPa级钢筋中的增氮剂主要成分为氮化硅铁。
优选的，所述钢筋混凝土用600MPa级钢筋中的增氮剂主要成分为氮化硅锰。
优选的，所述钢筋混凝土用600MPa级钢筋中的增氮剂主要成分为氮化锰铁。
本申请实施例中的上述一个或多个技术方案，至少具有如下一种或多种技术效果：
1、本发明实施例提供的一种钢筋混凝土用600MPa级钢筋生产方法，所述方法包括：通过转炉对制钢原料进行炼制，获得粗炼钢水；将所述粗炼钢 水通过精炼炉进行精炼，获得精炼钢水；通过连铸机对所述精炼钢水进行轧制，获得连铸钢坯；将所述连铸钢坯输送至加热炉进行加热后，进入机架粗轧机组进行粗轧操作，获得粗轧钢坯；对所述粗轧钢坯通过剪切、碎断后，进入机架中轧机组进行中轧操作，获得中轧钢坯；对所述中轧钢坯进行预水冷段实现低温精轧后，进行剪切、碎断，进入机架精轧机组进行精轧操作，获得精轧钢坯；对所述精轧钢坯进行冷却、剪切后，精整入库。达到了在普通钢筋的基础上调整化学成分和轧制工艺，提高了钢筋的综合性能，经淬火和回火处理后达到600MPa级高性能钢筋的各项指标要求，开发了高微合金钢坯防止铸坯表面缺陷的炼钢、连铸技术，综合了微合金固溶强化、细晶强化、析出强化及相应的加热、控轧控冷轧制技术，形成了稳定的工业化轧制技术，降低成本、大幅提高经济效益的技术效果。从而解决了现有技术中采用微合金化路线，依靠单一的生产工艺途径很难达到强度要求，存在成本高的技术问题。
2、本发明实施例提供的一种钢筋混凝土用600MPa级钢筋，所述钢筋混凝土用600MPa级钢筋成分占比为：C：0.21-0.26％、Mn：1.40-1.80％、Si：0.65-0.84％、V：0.08-0.11％、S≤0.020％、P≤0.025％、N：0.023-0.029％、Nb：0.015-0.025％，其余为Fe和不可避免的杂质。达到了满足600MPa细晶高强抗震多方面要求而特别设计的Nb、V复合成分体系，通过工艺、成分的调整使得轧制的钢筋满足600MPa高强度的使用要求，同时节约用钢量达到30以上，大大改善当前建筑用产品品种结构，提升经济效益的技术效果。解决了现有技术中采用微合金化路线，依靠单一的生产工艺途径很难达到强度要求，存在成本高的技术问题。
上述说明仅是本发明技术方案的概述，为了能够更清楚了解本发明的技 术手段，而可依照说明书的内容予以实施，并且为了让本发明的上述和其它目的、特征和优点能够更明显易懂，以下特举本发明的具体实施方式。
附图说明
图1为本发明实施例中一种钢筋混凝土用600MPa级钢筋生产方法的流程示意图。
具体实施方式
本发明实施例提供了一种钢筋混凝土用600MPa级钢筋及其生产方法，用于解决现有技术中采用微合金化路线，依靠单一的生产工艺途径很难达到强度要求，存在成本高的技术问题。
本发明提供的技术方案总体思路如下：
通过转炉对制钢原料进行炼制，获得粗炼钢水；将所述粗炼钢水通过精炼炉进行精炼，获得精炼钢水；通过连铸机对所述精炼钢水进行轧制，获得连铸钢坯；将所述连铸钢坯输送至加热炉进行加热后，进入机架粗轧机组进行粗轧操作，获得粗轧钢坯；对所述粗轧钢坯通过剪切、碎断后，进入机架中轧机组进行中轧操作，获得中轧钢坯；对所述中轧钢坯进行预水冷段实现低温精轧后，进行剪切、碎断，进入机架精轧机组进行精轧操作，获得精轧钢坯；对所述精轧钢坯进行冷却、剪切后，精整入库。达到了在普通钢筋的基础上调整化学成分和轧制工艺，提高了钢筋的综合性能，经淬火和回火处理后达到600MPa级高性能钢筋的各项指标要求，开发了高微合金钢坯防止铸坯表面缺陷的炼钢、连铸技术，综合了微合金固溶强化、细晶强化、析出强化及相应的加热、控轧控冷轧制技术，形成了稳定的工业化轧制技术，降低成本、大幅提高经济效益的技术效果。
应理解，本发明实施例中，所述LF是(LADLE FURNACE)的简称，即钢包精炼炉，是钢铁生产中主要的炉外精炼设备。LF炉一般指钢铁行业中的精炼炉。实际就是电弧炉的一种特殊形式。LF炉精炼主要靠桶内的白渣，在低氧的气氛中(氧含量为5％)，向桶内吹氩气进行搅拌并由石墨电极对经过初炼炉的钢水加热而精炼。由于氩气搅拌加速了渣一钢之间的化学反应，用电弧加热进行温度补偿，可以保证较长时间的精炼时间，从而可使钢中的氧、硫含量降低，夹杂物按ASTM评级为0～0.1级。LF炉可以与电炉配合，以取代电炉的还原期，还可以与氧气转炉配合，生产优质合金钢。此外，LF炉还是连铸车间，特别是合金钢连铸生产线上不可缺少的控制成分、温度及保存钢水的设备。因此LF炉的出现形成了LD-LF-RH-CC(连铸)新的生产优质钢的联合生产线。在这种联合生产线上钢的还原精炼主要是靠LF炉来完成的。LF炉所处理的钢种几乎涉及从特钢到普钢的所有钢种，生产中可视质量控制的需要，采用不同的工艺操作制度。在各种二次精炼设备中，LF炉的综合性价比高。
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例一
图1为本发明实施例中一种钢筋混凝土用600MPa级钢筋生产方法的流程示意图。如图1所示，本发明实施例提供了一种钢筋混凝土用600MPa级钢筋生产方法，所述方法包括：
步骤10：通过转炉对制钢原料进行炼制，获得粗炼钢水。
步骤20：将所述粗炼钢水通过精炼炉进行精炼，获得精炼钢水。
步骤30：通过连铸机对所述精炼钢水进行轧制，获得连铸钢坯。
步骤40：将所述连铸钢坯输送至加热炉进行加热后，进入机架粗轧机组进行粗轧操作，获得粗轧钢坯。
进一步的，所述将所述连铸钢坯输送至加热炉进行加热之前，包括：对所述连铸钢坯进行检验；将检验合格的所述连铸钢坯，通过传送辊道输送至所述加热炉进行加热。
步骤50：对所述粗轧钢坯通过剪切、碎断后，进入机架中轧机组进行中轧操作，获得中轧钢坯。
进一步的，所述对所述粗轧钢坯通过剪切、碎断，包括：对所述粗轧钢坯进行曲臂剪切钢坯头、剪切钢坯尾后，进行碎断。
步骤60：对所述中轧钢坯进行预水冷段实现低温精轧后，进行剪切、碎断，进入机架精轧机组进行精轧操作，获得精轧钢坯。
进一步的，所述对所述中轧钢坯进行预水冷段实现低温精轧后，进行剪切、碎断，包括：对所述精轧钢坯进行回转剪切钢坯头、剪切钢坯尾后，进行碎断。
步骤70：对所述精轧钢坯进行冷却、剪切后，精整入库。
具体而言，在现有的HRB400和HRB500产品中，C、Si、Mn等常用合金元素的含量已接近GB1499.2国家行业标准的上限值。开发HRB600时C、Si、Mn的上调空间不大。良好的焊接性是保证产品普遍应用的前提条件，为保证加工性能与焊接性能，国家标准对微观组织和碳当量也有明确要求。因此，必须采用微合金化路线，而采用的细晶强化是建立在轧后控冷特殊工艺途径上 使晶粒得以细化，而实际情况往往复杂得多，仅仅依靠单一的生产工艺途径是很难使晶粒达到4μm以下；V合金成本也相对较高，较高的合金含量也容易造成组织异常。为了避免以上因素，本发明实施例在采用合金化方式的基础上，按照与现行中低强度钢筋相同的生产工艺生产600MPa级高强钢筋，一方面可避免进行生产线改造，以及由此而引起的系列设备改造和成本投入等问题；另一方面也有助于新品能够大范围迅速的生产与推广。依据全流程连续控制温度轧制技术要求对生产设备进行改造，本发明实施例的加工工艺技术路线为：二钢4-5#转炉→LF精炼炉→4-5#连铸机→钢坯检验→加热炉加热→8机架粗轧机组→曲臂剪切头、切尾、碎断→4机架中轧机组→预水冷段实现低温精轧→回转剪切头、切尾、碎断→6机架精轧机组→轧后水冷段控制冷却→倍尺剪分段剪切→冷床自然冷却→冷剪定尺剪切→短尺剔除→计数、精整→打捆、称重→吊运、入库。根据钢筋轧钢生产线粗、中、精轧机组实际生产设备参数，综合利用再结晶、未再结晶和形变诱导铁素体机制以及轧后控冷等工艺措施，达到控制晶粒长大和组织均匀化的目的。同时优化工艺路线，以合金化方式为主，轧制工艺途径为辅，降低产品生产成本，稳定产品质量，产品生产技术日趋成熟，且企业具备了持续创新能力，技术风险极小。从而解决现有技术中采用微合金化路线，依靠单一的生产工艺途径很难达到强度要求，存在成本高的技术问题。达到了在普通钢筋的基础上调整化学成分和轧制工艺，提高了钢筋的综合性能，经淬火和回火处理后达到600MPa级高性能钢筋的各项指标要求，开发了高微合金钢坯防止铸坯表面缺陷的炼钢、连铸技术，综合了微合金固溶强化、细晶强化、析出强化及相应的加热、控轧控冷轧制技术，形成了稳定的工业化轧制技术，大幅提高经济效益的技术效果。
进一步的，对所述精轧钢坯进行冷却、剪切后，精整入库，包括：对所述精轧钢坯水冷段控制冷却；冷却后的所述精轧钢坯通过倍尺剪分段剪切；经剪切后的所述精轧钢坯进行冷床自然冷却后，进行冷剪定尺剪切；对剪切处理后的钢坯进行精整入库。
进一步的，所述对剪切处理后的钢坯进行精整入库，包括：对所述钢坯进行短尺剔除；将剔除选择后的钢坯进行计数、精整；精整后的钢坯进行打捆、称重后，通过吊运入库。
进一步的，在各轧钢机组之间均有控温段设置，不需进行回复段设置。
具体而言，本发明实施例中，在进行600MPa级钢筋生产过程中，结合化学成分调控，根据粗、中、精轧机组轧制速度和压下量的不同，利用微合金细晶强化、再结晶轧制、未再结晶轧制、形变诱导铁素体机制，分配每个阶段的温度控制，通过连续不断的控温+变形轧制过程，实现了钢材微观组织的细化与均匀化。在工艺布置方面，克服了传统工艺的缺点，在各机组间均有控温段设置，不需回复段设置，可以综合利用各种控制机制和满足不同规格和成分控轧需要。在轧制后通过控冷等工艺措施，对精炼后的板坯进行冷却，达到控制晶粒长大和组织均匀化的目的。保证了钢筋产品的高强度，有效节约用钢量30％以上，大大改善当前建筑用产品品种结构，大幅提高经济效益。
进一步的，所述制钢原料中V/N为3.49-3.83。
进一步的，所述制钢原料中的增氮剂主要成分为氮化硅铁。
进一步的，所述制钢原料中的增氮剂主要成分为氮化硅锰。
进一步的，所述制钢原料中的增氮剂主要成分为氮化锰铁。
进一步的，所述制钢原料中Nb的含量占比为0.015-0.025％。
具体而言，目前国内主要采用添加合金元素方式提高钢筋力学性能，利 用合金元素的固溶强化机制、析出强化机制和细晶强化机制，提高钢筋强度等级。在600MPa钢筋生产冶炼时，通过添加钒氮合金进行钒、氮微合金化是公认的经济有效的方法，但实际生产中，当钒含量超过0.10％时，钢中氮含量就相对偏低，一般V/N比＞5，远高于其理想配比3.64，此时不能充分发挥钒的强化作用，因此需要通过加入更多的钒来保证钢筋强度等级，导致生产成本增加，而且浪费合金资源。本发明实施例的方法通过添加以氮化硅铁或氮化硅锰或氮化锰铁为主要成分的增氮剂，在钢筋中稳定地补充必要的氮，有效的将V/N比控制在3.49-3.83范围内，充分发挥钒的强化效果同时添加少量的铌(0.015-0.025％)，通过铌钒复合强化机制，提高钢筋的强屈比和极限强度，最终减少钒的用量，从而节约贵重金属资源，降低生产成本。本技术是在普通钢筋的基础上调整化学成分和轧制工艺，提高了钢筋的综合性能，经淬火和回火处理后达到600MPa级高性能钢筋的各项指标要求。
实施例二
本发明实施例提供了一种钢筋混凝土用600MPa级钢筋，适用于实施例一所述的生产方法，所述钢筋混凝土用600MPa级钢筋成分占比为：C：0.21-0.26％、Mn：1.40-1.80％、Si：0.65-0.84％、V：0.08-0.11％、S≤0.020％、P≤0.025％、N：0.023-0.029％、Nb：0.015-0.025％，其余为Fe和不可避免的杂质。
进一步的，所述钢筋混凝土用600MPa级钢筋中晶粒不大于4μm。
进一步的，所述钢筋混凝土用600MPa级钢筋的强度为600MPa。
具体而言，本发明实施例的钢筋混凝土用600MPa级钢筋的强度为600MPa，满足高强度的钢筋要求，其化学成分按重量百分比为C：0.21-0.26％、Mn：1.40-1.80％、Si：0.65-0.84％、V：0.08-0.11％、S≤0.020％、P≤0.025％、N： 0.023-0.029％、Nb：0.015-0.025％，其余为Fe和不可避免的杂质。其中，C是钢中最经济的强化元素之一，通过C含量的控制，保证材料的强度，固溶强化，提高屈服强度。Si为脱氧元素，在钢中固溶强化，保证钢的强度。Mn是固溶强化元素，提高屈服强度，保证强韧性。P为钢中杂质元素，过高会使钢的焊接性、成形性降低。S为钢中杂质元素，影响钢的低温韧性。固溶的N能提高强度，含量过高会严重恶化材料的塑性和韧性，特别是对于热处理高强钢。Nb是第二相形成元素，发挥着析出强化作用，具有抑制热轧工序中奥氏体的恢复、再结晶的晶粒成长、从而使铁素体相成为所希望的粒径的作用，第二相粒子属于硬相，可增加基体的耐磨性。V是第二相形成元素，发挥着析出强化作用，一定量的V改善焊接不完全重结晶区强度。由于现有的HRB400和HRB500产品中，C、Si、Mn等常用合金元素的含量已接近GB1499.2国家行业标准的上限值。开发HRB600时C、Si、Mn的上调空间不大。良好的焊接性是保证产品普遍应用的前提条件，为保证加工性能与焊接性能，国家标准对微观组织和碳当量也有明确要求。因此，必须采用微合金化路线，而采用的细晶强化是建立在轧后控冷特殊工艺途径上使晶粒得以细化，而实际情况往往复杂得多，仅仅依靠单一的生产工艺途径是很难使晶粒达到4μm以下；V合金成本也相对较高，较高的合金含量也容易造成组织异常。为了避免以上因素，本发明实施例在采用合金化方式的基础上，按照与现行中低强度钢筋相同的生产工艺生产600MPa级高强钢筋，一方面可避免进行生产线改造，以及由此而引起的系列设备改造和成本投入等问题；另一方面也有助于新品能够大范围迅速的生产与推广。通过结合化学成分调控，根据粗、中、精轧机组轧制速度和压下量的不同，利用微合金细晶强化、再结晶轧制、未再结晶轧制、形变诱导铁素体机制，分配每个阶段的温度控制，通过连续不断的控 温+变形轧制过程，实现了钢材微观组织的细化与均匀化。在工艺布置方面，克服了传统工艺的缺点，在各机组间均有控温段设置，不需回复段设置，可以综合利用各种控制机制和满足不同规格和成分控轧需要。满足600MPa细晶高强抗震多方面要求而特别设计的Nb、V复合成分体系，通过工艺改造后和成分的调整使得轧制的钢筋满足600MPa高强度的使用要求，同时节约用钢量达到30以上，大大改善当前建筑用产品品种结构，提升经济效益。解决了现有技术中采用微合金化路线，依靠单一的生产工艺途径很难达到强度要求，存在成本高的技术问题。
进一步的，所述钢筋混凝土用600MPa级钢筋成分占比中V/N不大于5。
进一步的，所述钢筋混凝土用600MPa级钢筋成分占比中V/N为3.49-3.83。
进一步的，所述钢筋混凝土用600MPa级钢筋中的增氮剂主要成分为氮化硅铁。
进一步的，所述钢筋混凝土用600MPa级钢筋中的增氮剂主要成分为氮化硅锰。
进一步的，所述钢筋混凝土用600MPa级钢筋中的增氮剂主要成分为氮化锰铁。
具体而言，目前国内主要采用添加合金元素方式提高钢筋力学性能，利用合金元素的固溶强化机制、析出强化机制和细晶强化机制，提高钢筋强度等级。在600MPa钢筋生产冶炼时，通过添加钒氮合金进行钒、氮微合金化是公认的经济有效的方法，但实际生产中，当钒含量超过0.10％时，钢中氮含量就相对偏低，一般V/N比＞5，远高于其理想配比3.64，此时不能充分发挥钒的强化作用，因此需要通过加入更多的钒来保证钢筋强度等级，导致生产成 本增加，而且浪费合金资源。本发明实施例的方法通过添加以氮化硅铁或氮化硅锰或氮化锰铁为主要成分的增氮剂，在钢筋中稳定地补充必要的氮，有效的将V/N比控制在3.49-3.83范围内，充分发挥钒的强化效果同时添加少量的铌(0.015-0.025％)，通过铌钒复合强化机制，提高钢筋的强屈比和极限强度，最终减少钒的用量，从而节约贵重金属资源，降低生产成本。本技术是在普通钢筋的基础上调整化学成分和轧制工艺，提高了钢筋的综合性能，经淬火和回火处理后达到600MPa级高性能钢筋的各项指标要求。
本申请实施例中的上述一个或多个技术方案，至少具有如下一种或多种技术效果：
1、本发明实施例提供的一种钢筋混凝土用600MPa级钢筋生产方法，所述方法包括：通过转炉对制钢原料进行炼制，获得粗炼钢水；将所述粗炼钢水通过精炼炉进行精炼，获得精炼钢水；通过连铸机对所述精炼钢水进行轧制，获得连铸钢坯；将所述连铸钢坯输送至加热炉进行加热后，进入机架粗轧机组进行粗轧操作，获得粗轧钢坯；对所述粗轧钢坯通过剪切、碎断后，进入机架中轧机组进行中轧操作，获得中轧钢坯；对所述中轧钢坯进行预水冷段实现低温精轧后，进行剪切、碎断，进入机架精轧机组进行精轧操作，获得精轧钢坯；对所述精轧钢坯进行冷却、剪切后，精整入库。达到了在普通钢筋的基础上调整化学成分和轧制工艺，提高了钢筋的综合性能，经淬火和回火处理后达到600MPa级高性能钢筋的各项指标要求，开发了高微合金钢坯防止铸坯表面缺陷的炼钢、连铸技术，综合了微合金固溶强化、细晶强化、析出强化及相应的加热、控轧控冷轧制技术，形成了稳定的工业化轧制技术，降低成本、大幅提高经济效益的技术效果。从而解决了现有技术中采用微合金化路线，依靠单一的生产工艺途径很难达到强度要求，存在成本高的技术 问题。
2、本发明实施例提供的一种钢筋混凝土用600MPa级钢筋，所述钢筋混凝土用600MPa级钢筋成分占比为：C：0.21-0.26％、Mn：1.40-1.80％、Si：0.65-0.84％、V：0.08-0.11％、S≤0.020％、P≤0.025％、N：0.023-0.029％、Nb：0.015-0.025％，其余为Fe和不可避免的杂质。达到了满足600MPa细晶高强抗震多方面要求而特别设计的Nb、V复合成分体系，通过工艺、成分的调整使得轧制的钢筋满足600MPa高强度的使用要求，同时节约用钢量达到30以上，大大改善当前建筑用产品品种结构，提升经济效益的技术效果。解决了现有技术中采用微合金化路线，依靠单一的生产工艺途径很难达到强度要求，存在成本高的技术问题。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例做出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明实施例进行各种改动和变型而不脱离本发明实施例的精神和范围。这样，倘若本发明实施例的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (20)

  1. 一种钢筋混凝土用600MPa级钢筋生产方法，其特征在于，所述方法包括：
    通过转炉对制钢原料进行炼制，获得粗炼钢水；
    将所述粗炼钢水通过精炼炉进行精炼，获得精炼钢水；
    通过连铸机对所述精炼钢水进行轧制，获得连铸钢坯；
    将所述连铸钢坯输送至加热炉进行加热后，进入机架粗轧机组进行粗轧操作，获得粗轧钢坯；
    对所述粗轧钢坯通过剪切、碎断后，进入机架中轧机组进行中轧操作，获得中轧钢坯；
    对所述中轧钢坯进行预水冷段实现低温精轧后，进行剪切、碎断，进入机架精轧机组进行精轧操作，获得精轧钢坯；
    对所述精轧钢坯进行冷却、剪切后，精整入库。
  2. 如权利要求1所述的方法，其特征在于，所述将所述连铸钢坯输送至加热炉进行加热之前，包括：
    对所述连铸钢坯进行检验；
    将检验合格的所述连铸钢坯，通过传送辊道输送至所述加热炉进行加热。
  3. 如权利要求1所述的方法，其特征在于，所述对所述粗轧钢坯通过剪切、碎断，包括：
    对所述粗轧钢坯进行曲臂剪切钢坯头、剪切钢坯尾后，进行碎断。
  4. 如权利要求1所述的方法，其特征在于，所述对所述中轧钢坯进行预水冷段实现低温精轧后，进行剪切、碎断，包括：
    对所述精轧钢坯进行回转剪切钢坯头、剪切钢坯尾后，进行碎断。
  5. 如权利要求1所述的方法，其特征在于，对所述精轧钢坯进行冷却、剪切后，精整入库，包括：
    对所述精轧钢坯水冷段控制冷却；
    冷却后的所述精轧钢坯通过倍尺剪分段剪切；
    经剪切后的所述精轧钢坯进行冷床自然冷却后，进行冷剪定尺剪切；
    对剪切处理后的钢坯进行精整入库。
  6. 如权利要求5所述的方法，其特征在于，所述对剪切处理后的钢坯进行精整入库，包括：
    对所述钢坯进行短尺剔除；
    将剔除选择后的钢坯进行计数、精整；
    精整后的钢坯进行打捆、称重后，通过吊运入库。
  7. 如权利要求1所述的方法，其特征在于，在各轧钢机组之间均有控温段设置，不需进行回复段设置。
  8. 如权利要求1所述的方法，其特征在于，所述制钢原料中V/N为3.49-3.83。
  9. 如权利要求8所述的方法，其特征在于，所述制钢原料中的增氮剂主要成分为氮化硅铁。
  10. 如权利要求8所述的方法，其特征在于，所述制钢原料中的增氮剂主要成分为氮化硅锰。
  11. 如权利要求8所述的方法，其特征在于，所述制钢原料中的增氮剂主要成分为氮化锰铁。
  12. 如权利要求1所述的方法，其特征在于，所述制钢原料中Nb的含量占比为0.015-0.025％。
  13. 一种钢筋混凝土用600MPa级钢筋，适用于权利要求1-12任一所述的生产方法，其特征在于，所述钢筋混凝土用600MPa级钢筋成分占比为：C：0.21-0.26％、Mn：1.40-1.80％、Si：0.65-0.84％、V：0.08-0.11％、S≤0.020％、P≤0.025％、N：0.023-0.029％、Nb：0.015-0.025％，其余为Fe和不可避免的杂质。
  14. 如权利要求13所述的钢筋混凝土用600MPa级钢筋，其特征在于，所述钢筋混凝土用600MPa级钢筋成分占比中V/N不大于5。
  15. 如权利要求14所述的钢筋混凝土用600MPa级钢筋，其特征在于，所述钢筋混凝土用600MPa级钢筋成分占比中V/N为3.49-3.83。
  16. 如权利要求13所述的钢筋混凝土用600MPa级钢筋，其特征在于，所述钢筋混凝土用600MPa级钢筋中晶粒不大于4μm。
  17. 如权利要求13所述的钢筋混凝土用600MPa级钢筋，其特征在于，所述钢筋混凝土用600MPa级钢筋的强度为600MPa。
  18. 如权利要求13所述的钢筋混凝土用600MPa级钢筋，其特征在于，所述钢筋混凝土用600MPa级钢筋中的增氮剂主要成分为氮化硅铁。
  19. 如权利要求13所述的方法，其特征在于，所述钢筋混凝土用600MPa级钢筋中的增氮剂主要成分为氮化硅锰。
  20. 如权利要求13所述的方法，其特征在于，所述钢筋混凝土用600MPa级钢筋中的增氮剂主要成分为氮化锰铁。
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