CN111088451A - 600 MPa-level steel bar for reinforced concrete and production method thereof - Google Patents
600 MPa-level steel bar for reinforced concrete and production method thereof Download PDFInfo
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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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/04—Making ferrous alloys by melting
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- 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
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- 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
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Abstract
The invention provides a 600 MPa-grade steel bar for reinforced concrete and a production method thereof, wherein the production method comprises the following steps: refining the steel making raw materials through a converter to obtain rough molten steel; refining through a refining furnace to obtain refined molten steel; rolling by a continuous casting machine to obtain a continuous casting billet; conveying the steel billet to a heating furnace for heating, and then entering a rack roughing mill set for roughing operation to obtain a roughing billet; after shearing and breaking, the steel blank enters a frame middle rolling unit for middle rolling operation, a pre-water cooling section is used for realizing low-temperature finish rolling, shearing and breaking are carried out, the steel blank enters a frame finishing rolling unit for finish rolling operation, and the finished steel blank is cooled, sheared and finished and stored in a warehouse. Solves the technical problems of difficult achievement of strength requirement and high cost by a single production process approach. The chemical components and the rolling process are adjusted on the basis of the common steel bar, the requirements of various indexes of the high-performance steel bar are met, a stable industrial rolling technology is formed, the cost is reduced, and the income is increased.
Description
Technical Field
The invention relates to the technical field of steel bar manufacturing processes, in particular to a 600 MPa-grade steel bar for reinforced concrete and a production method thereof.
Background
HRB400(E) and HRB500(E) steel bars in the market are saturated at present, the improvement condition can not occur in a short period, anti-seismic steel bars with the high strength level of 600MPa and above have the market, and the 600MPa high-strength steel bars are domestic high-grade steel bars and are widely used for various building structures, particularly large, heavy, light thin-wall and high-rise building structures. Compared with the reinforcing steel bar of 400MPa grade, the high-strength reinforcing steel bar of 600MPa grade and above can save the steel consumption by more than 30 percent. The development and application of the novel material can also promote the popularization and application of the novel material with high performance, energy conservation and environmental protection, greatly improve the variety and structure of the current products for construction, and provide powerful support for resource-saving and environment-friendly enterprises.
However, the applicant of the present invention finds that the prior art has at least the following technical problems:
in the prior art, a microalloying route is adopted, the strength requirement is difficult to meet by a single production process, and the technical problem of high cost exists.
Disclosure of Invention
The embodiment of the invention provides a 600 MPa-grade steel bar for reinforced concrete and a production method thereof, and solves the technical problems that the strength requirement is difficult to meet by adopting a micro-alloying route and depending on a single production process approach, and the cost is high in the prior art.
In view of the above problems, the embodiments of the present application are proposed to provide a 600 MPa-level steel bar for reinforced concrete and a method for producing the same.
In a first aspect, the invention provides a method for producing a 600 MPa-grade steel bar for reinforced concrete, which comprises the following steps: refining the steel making raw materials through a converter to obtain rough molten steel; refining the crude steelmaking water through a refining furnace to obtain refined molten steel; rolling the refined molten steel through a continuous casting machine to obtain a continuous casting billet; conveying the continuous casting billet to a heating furnace for heating, and then entering a frame rough rolling unit for rough rolling operation to obtain a rough rolling billet; after the rough rolling billet is sheared and broken, the rough rolling billet enters a rack middle rolling unit to perform middle rolling operation, and a middle rolling billet is obtained; after the pre-water cooling section of the medium-rolled steel billet is subjected to low-temperature finish rolling, shearing and breaking are carried out, and the medium-rolled steel billet enters a rack finishing mill group to be subjected to finish rolling operation, so that a finish-rolled steel billet is obtained; and cooling and shearing the finish rolling billet, and finishing and warehousing.
Preferably, before the continuous casting billet is conveyed to a heating furnace to be heated, the method comprises the following steps: inspecting the continuous casting billet; and conveying the continuous casting billet which is qualified through inspection to the heating furnace through a conveying roller way for heating.
Preferably, the cutting and breaking of the rough rolling billet comprises: and cutting the rough rolling billet into a billet head and a billet tail by the crank arm, and then cutting the rough rolling billet into pieces.
Preferably, after the pre-water cooling section of the medium rolling billet is subjected to low-temperature finish rolling, shearing and breaking are performed, and the method comprises the following steps: and performing rotary shearing on the finish rolling billet to cut a billet head and cut a billet tail, and then performing fragmentation.
Preferably, the cooling, shearing and finishing of the finish-rolled steel billet into a warehouse comprises: controlling and cooling the water cooling section of the finish rolling billet; cutting the cooled finish rolling steel billet by sections through a double-length shear; naturally cooling the sheared finish rolling steel billet by a cooling bed, and performing cold shearing and fixed-length shearing; and finishing and warehousing the sheared steel billets.
Preferably, the finishing and warehousing of the sheared steel billet comprises: short ruler removing is carried out on the billet; counting and finishing the steel billets after the selection is eliminated; and bundling and weighing the finished steel billets, and then hoisting and warehousing the finished steel billets.
Preferably, there is a temperature control section between the rolling mill trains, and a return section is not required.
Preferably, the V/N ratio in the steel-making raw material is 3.49 to 3.83.
Preferably, the main component of the nitrogen increasing agent in the steel making raw material is ferrosilicon nitride.
Preferably, the main component of the nitrogen increasing agent in the steel making raw material is silicon manganese nitride.
Preferably, the main component of the nitrogen increasing agent in the steel making raw material is manganese iron nitride.
Preferably, the steel-making raw material contains 0.015 to 0.025% of Nb.
In a second aspect, the invention provides a 600 MPa-grade steel bar for reinforced concrete, which is suitable for the production method, wherein the 600 MPa-grade steel bar for reinforced concrete comprises the following components in percentage by weight: c: 0.21-0.26%, Mn: 1.40-1.80%, Si: 0.65-0.84%, V: 0.08-0.11%, S is less than or equal to 0.020%, P is less than or equal to 0.025%, N: 0.023-0.029%, Nb: 0.015-0.025%, and the balance of Fe and inevitable impurities.
Preferably, V/N in the ratio of the 600 MPa-grade steel bar components for the reinforced concrete is not more than 5.
Preferably, the V/N ratio of the 600 MPa-grade reinforcing steel bar component for the reinforced concrete is 3.49-3.83.
Preferably, the crystal grains in the 600 MPa-grade steel bar for the reinforced concrete are not more than 4 microns.
Preferably, the strength of the 600 MPa-grade steel bar for the reinforced concrete is 600 MPa.
Preferably, the main component of the nitrogen increasing agent in the 600 MPa-grade steel bar for the reinforced concrete is ferrosilicon nitride.
Preferably, the nitrogen increasing agent in the 600 MPa-grade steel bar for the reinforced concrete mainly comprises manganese silicon nitride.
Preferably, the nitrogen increasing agent in the 600 MPa-grade steel bar for the reinforced concrete mainly comprises manganese iron nitride.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
1. the embodiment of the invention provides a method for producing 600 MPa-level steel bars for reinforced concrete, which comprises the following steps: refining the steel making raw materials through a converter to obtain rough molten steel; refining the crude steelmaking water through a refining furnace to obtain refined molten steel; rolling the refined molten steel through a continuous casting machine to obtain a continuous casting billet; conveying the continuous casting billet to a heating furnace for heating, and then entering a frame rough rolling unit for rough rolling operation to obtain a rough rolling billet; after the rough rolling billet is sheared and broken, the rough rolling billet enters a rack middle rolling unit to perform middle rolling operation, and a middle rolling billet is obtained; after the pre-water cooling section of the medium-rolled steel billet is subjected to low-temperature finish rolling, shearing and breaking are carried out, and the medium-rolled steel billet enters a rack finishing mill group to be subjected to finish rolling operation, so that a finish-rolled steel billet is obtained; and cooling and shearing the finish rolling billet, and finishing and warehousing. The method achieves the technical effects of adjusting chemical components and rolling process on the basis of common steel bars, improving the comprehensive performance of the steel bars, achieving various index requirements of 600 MPa-grade high-performance steel bars after quenching and tempering treatment, developing steelmaking and continuous casting technologies for preventing surface defects of casting blanks of high-microalloy steel billets, integrating microalloy solid solution strengthening, fine grain strengthening, precipitation strengthening and corresponding heating, controlled rolling and controlled cooling rolling technologies, forming a stable industrialized rolling technology, reducing cost and greatly improving economic benefit. Thereby solving the technical problems that the prior art adopts a micro-alloying route, is difficult to meet the strength requirement depending on a single production process approach and has high cost.
2. The embodiment of the invention provides a 600 MPa-grade steel bar for reinforced concrete, which comprises the following components in percentage by weight: c: 0.21-0.26%, Mn: 1.40-1.80%, Si: 0.65-0.84%, V: 0.08-0.11%, S is less than or equal to 0.020%, P is less than or equal to 0.025%, N: 0.023-0.029%, Nb: 0.015-0.025%, and the balance of Fe and inevitable impurities. The Nb-V composite component system specially designed to meet the requirements of 600MPa fine-grain high-strength earthquake resistance in various aspects is achieved, the rolled steel bar meets the use requirement of 600MPa high strength through adjustment of the process and the components, meanwhile, the steel consumption is saved by more than 30, the product variety structure for the current building is greatly improved, and the technical effect of economic benefit is improved. Solves the technical problems that the prior art adopts a micro-alloying route, is difficult to meet the strength requirement depending on a single production process approach and has high cost.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Fig. 1 is a schematic flow chart of a method for producing a 600 MPa-grade steel bar for reinforced concrete according to an embodiment of the invention.
Detailed Description
The embodiment of the invention provides a 600 MPa-grade steel bar for reinforced concrete and a production method thereof, which are used for solving the technical problems that the strength requirement is difficult to meet by adopting a micro-alloying route and relying on a single production process approach and the cost is high in the prior art.
The technical scheme provided by the invention has the following general idea:
refining the steel making raw materials through a converter to obtain rough molten steel; refining the crude steelmaking water through a refining furnace to obtain refined molten steel; rolling the refined molten steel through a continuous casting machine to obtain a continuous casting billet; conveying the continuous casting billet to a heating furnace for heating, and then entering a frame rough rolling unit for rough rolling operation to obtain a rough rolling billet; after the rough rolling billet is sheared and broken, the rough rolling billet enters a rack middle rolling unit to perform middle rolling operation, and a middle rolling billet is obtained; after the pre-water cooling section of the medium-rolled steel billet is subjected to low-temperature finish rolling, shearing and breaking are carried out, and the medium-rolled steel billet enters a rack finishing mill group to be subjected to finish rolling operation, so that a finish-rolled steel billet is obtained; and cooling and shearing the finish rolling billet, and finishing and warehousing. The method achieves the technical effects of adjusting chemical components and rolling process on the basis of common steel bars, improving the comprehensive performance of the steel bars, achieving various index requirements of 600 MPa-grade high-performance steel bars after quenching and tempering treatment, developing steelmaking and continuous casting technologies for preventing surface defects of casting blanks of high-microalloy steel billets, integrating microalloy solid solution strengthening, fine grain strengthening, precipitation strengthening and corresponding heating, controlled rolling and controlled cooling rolling technologies, forming a stable industrialized rolling technology, reducing cost and greatly improving economic benefit.
It should be understood that in the embodiment of the present invention, the LF is an abbreviation of LADLE furace (LADLE furace), i.e. a LADLE refining FURNACE, which is a main external refining device in steel production. LF furnaces are generally referred to as refining furnaces in the steel industry. In practice, it is a special form of electric arc furnace. The LF furnace refining mainly depends on white slag in a barrel, argon is blown into the barrel to stir in a low-oxygen atmosphere (the oxygen content is 5 percent), and molten steel passing through a primary refining furnace is heated by a graphite electrode to be refined. Because the argon stirring accelerates the chemical reaction between slag and steel, the arc heating is used for temperature compensation, and the longer refining time can be ensured, thereby reducing the oxygen and sulfur contents in the steel, and the inclusions are rated as O-O.1 grade according to ASTM. The LF furnace can be matched with an electric furnace to replace the reduction period of the electric furnace, and can also be matched with an oxygen converter to produce high-quality alloy steel. In addition, the LF furnace is also an indispensable device for controlling components, temperature and preserving molten steel on a continuous casting workshop, particularly an alloy steel continuous casting production line. Therefore, the appearance of the LF furnace forms a new combined production line for producing high-quality steel by LD-LF-RH-CC (continuous casting). The reduction refining of steel on the combined production line is mainly completed by an LF furnace. The steel grade treated by the LF furnace almost relates to all steel grades from special steel to general steel, and different process operation systems are adopted in the production according to the requirement of quality control. In various secondary refining equipment, the LF furnace has high comprehensive performance-price ratio.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 is a schematic flow chart of a method for producing a 600 MPa-grade steel bar for reinforced concrete according to an embodiment of the invention. As shown in fig. 1, an embodiment of the present invention provides a method for producing a 600 MPa-level steel bar for reinforced concrete, where the method includes:
step 10: and refining the steelmaking raw materials by a converter to obtain rough molten steel.
Step 20: and refining the crude steelmaking water through a refining furnace to obtain refined molten steel.
Step 30: and rolling the refined molten steel through a continuous casting machine to obtain a continuous casting billet.
Step 40: and conveying the continuous casting billet to a heating furnace for heating, and then entering a frame rough rolling unit for rough rolling operation to obtain a rough rolled billet.
Further, before the continuous casting billet is conveyed to a heating furnace for heating, the method comprises the following steps: inspecting the continuous casting billet; and conveying the continuous casting billet which is qualified through inspection to the heating furnace through a conveying roller way for heating.
Step 50: and after shearing and breaking the rough rolling billet, feeding the rough rolling billet into a rack medium rolling mill set for medium rolling operation to obtain a medium rolling billet.
Further, the cutting and breaking the rough rolling billet comprises: and cutting the rough rolling billet into a billet head and a billet tail by the crank arm, and then cutting the rough rolling billet into pieces.
Step 60: and (3) performing low-temperature finish rolling on the medium-rolled steel billet at a pre-water cooling section, shearing and breaking the medium-rolled steel billet, and performing finish rolling operation on the medium-rolled steel billet in a rack finishing mill unit to obtain a finish-rolled steel billet.
Further, after the pre-water cooling section of the medium rolling billet is subjected to low-temperature finish rolling, shearing and breaking are performed, and the method comprises the following steps: and performing rotary shearing on the finish rolling billet to cut a billet head and cut a billet tail, and then performing fragmentation.
Step 70: and cooling and shearing the finish rolling billet, and finishing and warehousing.
Specifically, in the existing HRB400 and HRB500 products, the content of common alloy elements such as C, Si, Mn and the like is close to the upper limit value of the GB1499.2 national industry standard. The development of HRB600 showed that the up-regulation spaces of C, Si and Mn were not large. Good weldability is a precondition for ensuring the general application of products, and national standards also have clear requirements on microstructure and carbon equivalent for ensuring processability and weldability. Therefore, a micro-alloying route is needed, and the adopted fine grain strengthening is to refine grains on the basis of a special process approach of controlled cooling after rolling, the actual situation is often much more complicated, and the grains are difficult to reach below 4 mu m only by depending on a single production process approach; the cost of the V alloy is relatively high, and the higher alloy content is easy to cause structural abnormality. In order to avoid the factors, the embodiment of the invention produces the 600MPa grade high-strength steel bar according to the same production process with the existing low-strength steel bar and the existing low-strength steel bar on the basis of adopting an alloying mode, so that the problems of production line reconstruction, series equipment reconstruction, cost input and the like caused by the production line reconstruction can be avoided; on the other hand, the method is also beneficial to the large-scale and rapid production and popularization of new products. According to the technical requirement of continuous control of temperature rolling in the whole process, the production equipment is modified, and the processing technology of the embodiment of the invention comprises the following technical routes: second steel 4-5# converter → LF refining furnace → 4-5# conticaster → billet inspection → heating furnace heating → 8 frame roughing mill group → crank arm shearing head, tail cutting, breaking → 4 frame middle rolling mill group → pre-water cooling section to realize low temperature finish rolling → rotary shearing head, tail cutting, breaking → 6 frame finishing mill group → controlled cooling of post-rolling water cooling section → double-length shear segmental shearing → natural cooling of cold bed → cold shear fixed-length shearing → short-length elimination → counting, finishing → bundling, weighing → hoisting and warehousing. According to the actual production equipment parameters of the roughing mill, the intermediate mill and the finishing mill of the steel bar rolling production line, the process measures of recrystallization, non-recrystallization and deformation induced ferrite mechanism, controlled cooling after rolling and the like are comprehensively utilized to achieve the purposes of controlling grain growth and tissue homogenization. Meanwhile, the process route is optimized, the alloying mode is taken as the main mode, the rolling process approach is taken as the auxiliary mode, the production cost of the product is reduced, the product quality is stabilized, the production technology of the product is mature day by day, enterprises have continuous innovation capability, and the technical risk is extremely low. Thereby solving the technical problems of difficult achievement of strength requirement and high cost by adopting a micro-alloying route and depending on a single production process approach in the prior art. The method achieves the technical effects of adjusting chemical components and rolling process on the basis of common steel bars, improving the comprehensive performance of the steel bars, achieving various index requirements of 600 MPa-grade high-performance steel bars after quenching and tempering treatment, developing steelmaking and continuous casting technologies for preventing surface defects of casting blanks of high-microalloy steel billets, integrating microalloy solid solution strengthening, fine grain strengthening, precipitation strengthening and corresponding heating, controlled rolling and controlled cooling rolling technologies, forming a stable industrialized rolling technology and greatly improving economic benefits.
Further, after cooling and shearing the finish rolling billet, finishing and warehousing comprise: controlling and cooling the water cooling section of the finish rolling billet; cutting the cooled finish rolling steel billet by sections through a double-length shear; naturally cooling the sheared finish rolling steel billet by a cooling bed, and performing cold shearing and fixed-length shearing; and finishing and warehousing the sheared steel billets.
Further, the finishing and warehousing of the sheared steel billets comprise: short ruler removing is carried out on the billet; counting and finishing the steel billets after the selection is eliminated; and bundling and weighing the finished steel billets, and then hoisting and warehousing the finished steel billets.
Furthermore, the temperature control section is arranged among the rolling mill groups, and the setting of the recovery section is not needed.
Specifically, in the embodiment of the invention, in the production process of the steel bar at the level of 600MPa, chemical component regulation and control are combined, the temperature control of each stage is distributed by utilizing the mechanisms of microalloy fine grain strengthening, recrystallization rolling, non-recrystallization rolling and deformation induced ferrite according to the difference of the rolling speed and the rolling reduction of a rough rolling mill, a medium rolling mill and a finishing rolling mill, and the refining and the homogenization of the microstructure of the steel are realized through the continuous temperature control and deformation rolling process. In the aspect of process arrangement, the defects of the traditional process are overcome, the temperature control sections are arranged among all the units, the setting of the recovery sections is not needed, and various control mechanisms can be comprehensively utilized and the requirements of controlled rolling of different specifications and components can be met. After rolling, the refined plate blank is cooled by technological measures such as controlled cooling and the like, so that the purposes of controlling grain growth and tissue homogenization are achieved. The high strength of the steel bar product is ensured, the steel consumption is effectively saved by more than 30%, the product variety structure for the current building is greatly improved, and the economic benefit is greatly improved.
Furthermore, V/N in the steel-making raw material is 3.49-3.83.
Furthermore, the main component of the nitrogen increasing agent in the steel making raw material is ferrosilicon nitride.
Furthermore, the main component of the nitrogen increasing agent in the steel making raw material is silicon manganese nitride.
Furthermore, the main component of the nitrogen increasing agent in the steel making raw material is manganese iron nitride.
Furthermore, the content of Nb in the steel-making raw materials accounts for 0.015-0.025%.
Specifically, at present, the mechanical property of the steel bar is improved mainly by adding alloy elements, and the strength grade of the steel bar is improved by utilizing a solid solution strengthening mechanism, a precipitation strengthening mechanism and a fine grain strengthening mechanism of the alloy elements. When the steel bar with the pressure of 600MPa is produced and smelted, microalloying of vanadium and nitrogen by adding vanadium-nitrogen alloy is a well-known economic and effective method, but in actual production, when the content of vanadium exceeds 0.10%, the content of nitrogen in steel is relatively low, the V/N ratio is generally more than 5 and is far higher than the ideal ratio of the vanadium by 3.64, the strengthening effect of vanadium cannot be fully exerted, so that the strength grade of the steel bar is ensured by adding more vanadium, the production cost is increased, and alloy resources are wasted. According to the method provided by the embodiment of the invention, the nitrogen increasing agent taking silicon nitride iron or silicon manganese nitride or manganese iron nitride as a main component is added, necessary nitrogen is stably supplemented in the steel bar, the V/N ratio is effectively controlled within the range of 3.49-3.83, the strengthening effect of vanadium is fully exerted, a small amount of niobium (0.015-0.025%) is added, the yield ratio and the ultimate strength of the steel bar are improved through a niobium-vanadium composite strengthening mechanism, and the vanadium consumption is finally reduced, so that the precious metal resource is saved, and the production cost is reduced. The technology adjusts chemical components and rolling technology on the basis of common steel bars, improves the comprehensive performance of the steel bars, and achieves various index requirements of 600 MPa-grade high-performance steel bars after quenching and tempering treatment.
Example two
The embodiment of the invention provides a 600 MPa-grade steel bar for reinforced concrete, which is suitable for the production method in the embodiment I, wherein the 600 MPa-grade steel bar for reinforced concrete comprises the following components in percentage by weight: c: 0.21-0.26%, Mn: 1.40-1.80%, Si: 0.65-0.84%, V: 0.08-0.11%, S is less than or equal to 0.020%, P is less than or equal to 0.025%, N: 0.023-0.029%, Nb: 0.015-0.025%, and the balance of Fe and inevitable impurities.
Furthermore, the crystal grains in the 600 MPa-grade steel bar for the reinforced concrete are not more than 4 microns.
Furthermore, the strength of the 600 MPa-grade steel bar for the reinforced concrete is 600 MPa.
Specifically, the strength of the 600 MPa-grade steel bar for reinforced concrete in the embodiment of the invention is 600MPa, the requirement of a high-strength steel bar is met, and the steel bar comprises the following chemical components in percentage by weight: 0.21-0.26%, Mn: 1.40-1.80%, Si: 0.65-0.84%, V: 0.08-0.11%, S is less than or equal to 0.020%, P is less than or equal to 0.025%, N: 0.023-0.029%, Nb: 0.015-0.025%, and the balance of Fe and inevitable impurities. Wherein C is one of the most economic strengthening elements in steel, and the strength of the material is ensured through the control of the content of C, the solid solution strengthening is realized, and the yield strength is improved. Si is a deoxidizing element and is subjected to solid solution strengthening in the steel, so that the strength of the steel is ensured. Mn is a solid solution strengthening element, improves the yield strength and ensures the obdurability. P is an impurity element in steel, and too high P lowers weldability and formability of steel. S is an impurity element in steel, and influences the low-temperature toughness of the steel. The dissolved N can improve the strength, and the plasticity and the toughness of the material are seriously deteriorated if the content is too high, particularly for heat-treated high-strength steel. Nb is a second phase forming element, exerts a precipitation strengthening action, and has an action of suppressing recovery of austenite and grain growth of recrystallization in the hot rolling step to make the ferrite phase a desired particle size, and the second phase particles belong to a hard phase to increase the wear resistance of the matrix. V is a second phase forming element and exerts a precipitation strengthening effect, and a certain amount of V improves the strength of an incomplete recrystallization zone of welding. Because the content of common alloy elements such as C, Si, Mn and the like in the prior HRB400 and HRB500 products is close to the upper limit value of the national industry standard GB 1499.2. The development of HRB600 showed that the up-regulation spaces of C, Si and Mn were not large. Good weldability is a precondition for ensuring the general application of products, and national standards also have clear requirements on microstructure and carbon equivalent for ensuring processability and weldability. Therefore, a micro-alloying route is needed, and the adopted fine grain strengthening is to refine grains on the basis of a special process approach of controlled cooling after rolling, the actual situation is often much more complicated, and the grains are difficult to reach below 4 mu m only by depending on a single production process approach; the cost of the V alloy is relatively high, and the higher alloy content is easy to cause structural abnormality. In order to avoid the factors, the embodiment of the invention produces the 600MPa grade high-strength steel bar according to the same production process with the existing low-strength steel bar and the existing low-strength steel bar on the basis of adopting an alloying mode, so that the problems of production line reconstruction, series equipment reconstruction, cost input and the like caused by the production line reconstruction can be avoided; on the other hand, the method is also beneficial to the large-scale and rapid production and popularization of new products. By combining chemical component regulation and control, according to the difference of rolling speed and reduction of rough, medium and finishing mill groups, the temperature control of each stage is distributed by utilizing the mechanisms of microalloy fine grain strengthening, recrystallization rolling, non-recrystallization rolling and deformation induction ferrite, and the refining and homogenization of the microstructure of the steel are realized through the continuous temperature control and deformation rolling process. In the aspect of process arrangement, the defects of the traditional process are overcome, the temperature control sections are arranged among all the units, the setting of the recovery sections is not needed, and various control mechanisms can be comprehensively utilized and the requirements of controlled rolling of different specifications and components can be met. The Nb-V composite component system specially designed for meeting the requirements of 600MPa fine-grain high-strength earthquake resistance in various aspects enables the rolled steel bar to meet the use requirement of 600MPa high strength through process transformation and component adjustment, and meanwhile, the steel consumption is saved by more than 30, the product variety structure for the current building is greatly improved, and the economic benefit is improved. Solves the technical problems that the prior art adopts a micro-alloying route, is difficult to meet the strength requirement depending on a single production process approach and has high cost.
Furthermore, V/N in the proportion of the 600 MPa-grade steel bar components for the reinforced concrete is not more than 5.
Furthermore, V/N in the proportion of the 600 MPa-grade steel bar components for the reinforced concrete is 3.49-3.83.
Furthermore, the main component of the nitrogen increasing agent in the 600 MPa-grade steel bar for the reinforced concrete is ferrosilicon nitride.
Furthermore, the nitrogen increasing agent in the 600 MPa-grade steel bar for the reinforced concrete mainly comprises silicon manganese nitride.
Furthermore, the main component of the nitrogen increasing agent in the 600 MPa-grade steel bar for the reinforced concrete is manganese iron nitride.
Specifically, at present, the mechanical property of the steel bar is improved mainly by adding alloy elements, and the strength grade of the steel bar is improved by utilizing a solid solution strengthening mechanism, a precipitation strengthening mechanism and a fine grain strengthening mechanism of the alloy elements. When the steel bar with the pressure of 600MPa is produced and smelted, microalloying of vanadium and nitrogen by adding vanadium-nitrogen alloy is a well-known economic and effective method, but in actual production, when the content of vanadium exceeds 0.10%, the content of nitrogen in steel is relatively low, the V/N ratio is generally more than 5 and is far higher than the ideal ratio of the vanadium by 3.64, the strengthening effect of vanadium cannot be fully exerted, so that the strength grade of the steel bar is ensured by adding more vanadium, the production cost is increased, and alloy resources are wasted. According to the method provided by the embodiment of the invention, the nitrogen increasing agent taking silicon nitride iron or silicon manganese nitride or manganese iron nitride as a main component is added, necessary nitrogen is stably supplemented in the steel bar, the V/N ratio is effectively controlled within the range of 3.49-3.83, the strengthening effect of vanadium is fully exerted, a small amount of niobium (0.015-0.025%) is added, the yield ratio and the ultimate strength of the steel bar are improved through a niobium-vanadium composite strengthening mechanism, and the vanadium consumption is finally reduced, so that the precious metal resource is saved, and the production cost is reduced. The technology adjusts chemical components and rolling technology on the basis of common steel bars, improves the comprehensive performance of the steel bars, and achieves various index requirements of 600 MPa-grade high-performance steel bars after quenching and tempering treatment.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
1. the embodiment of the invention provides a method for producing 600 MPa-level steel bars for reinforced concrete, which comprises the following steps: refining the steel making raw materials through a converter to obtain rough molten steel; refining the crude steelmaking water through a refining furnace to obtain refined molten steel; rolling the refined molten steel through a continuous casting machine to obtain a continuous casting billet; conveying the continuous casting billet to a heating furnace for heating, and then entering a frame rough rolling unit for rough rolling operation to obtain a rough rolling billet; after the rough rolling billet is sheared and broken, the rough rolling billet enters a rack middle rolling unit to perform middle rolling operation, and a middle rolling billet is obtained; after the pre-water cooling section of the medium-rolled steel billet is subjected to low-temperature finish rolling, shearing and breaking are carried out, and the medium-rolled steel billet enters a rack finishing mill group to be subjected to finish rolling operation, so that a finish-rolled steel billet is obtained; and cooling and shearing the finish rolling billet, and finishing and warehousing. The method achieves the technical effects of adjusting chemical components and rolling process on the basis of common steel bars, improving the comprehensive performance of the steel bars, achieving various index requirements of 600 MPa-grade high-performance steel bars after quenching and tempering treatment, developing steelmaking and continuous casting technologies for preventing surface defects of casting blanks of high-microalloy steel billets, integrating microalloy solid solution strengthening, fine grain strengthening, precipitation strengthening and corresponding heating, controlled rolling and controlled cooling rolling technologies, forming a stable industrialized rolling technology, reducing cost and greatly improving economic benefit. Thereby solving the technical problems that the prior art adopts a micro-alloying route, is difficult to meet the strength requirement depending on a single production process approach and has high cost.
2. The embodiment of the invention provides a 600 MPa-grade steel bar for reinforced concrete, which comprises the following components in percentage by weight: c: 0.21-0.26%, Mn: 1.40-1.80%, Si: 0.65-0.84%, V: 0.08-0.11%, S is less than or equal to 0.020%, P is less than or equal to 0.025%, N: 0.023-0.029%, Nb: 0.015-0.025%, and the balance of Fe and inevitable impurities. The Nb-V composite component system specially designed to meet the requirements of 600MPa fine-grain high-strength earthquake resistance in various aspects is achieved, the rolled steel bar meets the use requirement of 600MPa high strength through adjustment of the process and the components, meanwhile, the steel consumption is saved by more than 30, the product variety structure for the current building is greatly improved, and the technical effect of economic benefit is improved. Solves the technical problems that the prior art adopts a micro-alloying route, is difficult to meet the strength requirement depending on a single production process approach and has high cost.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (20)
1. A production method of 600 MPa-level steel bars for reinforced concrete is characterized by comprising the following steps:
refining the steel making raw materials through a converter to obtain rough molten steel;
refining the crude steelmaking water through a refining furnace to obtain refined molten steel;
rolling the refined molten steel through a continuous casting machine to obtain a continuous casting billet;
conveying the continuous casting billet to a heating furnace for heating, and then entering a frame rough rolling unit for rough rolling operation to obtain a rough rolling billet;
after the rough rolling billet is sheared and broken, the rough rolling billet enters a rack middle rolling unit to perform middle rolling operation, and a middle rolling billet is obtained;
after the pre-water cooling section of the medium-rolled steel billet is subjected to low-temperature finish rolling, shearing and breaking are carried out, and the medium-rolled steel billet enters a rack finishing mill group to be subjected to finish rolling operation, so that a finish-rolled steel billet is obtained;
and cooling and shearing the finish rolling billet, and finishing and warehousing.
2. The method of claim 1 wherein said transporting said continuously cast steel slab to a furnace for heating comprises:
inspecting the continuous casting billet;
and conveying the continuous casting billet which is qualified through inspection to the heating furnace through a conveying roller way for heating.
3. The method of claim 1 wherein said subjecting said rough rolled steel slab to shearing and shredding comprises:
and cutting the rough rolling billet into a billet head and a billet tail by the crank arm, and then cutting the rough rolling billet into pieces.
4. The method of claim 1, wherein the shearing and breaking after the pre-water cooling section of the medium rolled steel slab is finish rolled at a low temperature comprises:
and performing rotary shearing on the finish rolling billet to cut a billet head and cut a billet tail, and then performing fragmentation.
5. The method of claim 1, wherein cooling, shearing, and finishing the finish rolled steel slab into storage comprises:
controlling and cooling the water cooling section of the finish rolling billet;
cutting the cooled finish rolling steel billet by sections through a double-length shear;
naturally cooling the sheared finish rolling steel billet by a cooling bed, and performing cold shearing and fixed-length shearing;
and finishing and warehousing the sheared steel billets.
6. The method of claim 5, wherein said finishing of said sheared billet into storage comprises:
short ruler removing is carried out on the billet;
counting and finishing the steel billets after the selection is eliminated;
and bundling and weighing the finished steel billets, and then hoisting and warehousing the finished steel billets.
7. The method of claim 1, wherein there is a temperature control section setup between rolling mill trains without a recovery section setup.
8. The method of claim 1, wherein the V/N in the steelmaking raw material is from 3.49 to 3.83.
9. The method according to claim 8, wherein the main component of the nitrogen increasing agent in the steel-making raw material is ferrosilicon nitride.
10. The method of claim 8, wherein the nitrogen increasing agent in the steel making raw material is mainly composed of manganese silicon nitride.
11. The method of claim 8, wherein the main component of the nitrogen increasing agent in the steel-making raw material is manganese iron nitride.
12. The method of claim 1, wherein the Nb content of the steelmaking material is in the range of 0.015 to 0.025%.
13. The 600 MPa-grade steel bar for the reinforced concrete is suitable for the production method of any one of claims 1 to 12, and is characterized in that the 600 MPa-grade steel bar for the reinforced concrete comprises the following components in percentage by weight: c: 0.21-0.26%, Mn: 1.40-1.80%, Si: 0.65-0.84%, V: 0.08-0.11%, S is less than or equal to 0.020%, P is less than or equal to 0.025%, N: 0.023-0.029%, Nb: 0.015-0.025%, and the balance of Fe and inevitable impurities.
14. The 600 MPa-scale reinforcement for reinforced concrete according to claim 13, wherein the V/N ratio of the 600 MPa-scale reinforcement composition for reinforced concrete is not more than 5.
15. The 600 MPa-scale reinforcement for reinforced concrete according to claim 14, wherein the composition ratio V/N of the 600 MPa-scale reinforcement for reinforced concrete is 3.49 to 3.83.
16. The 600 MPa-scale reinforcement for reinforced concrete according to claim 13, wherein the 600 MPa-scale reinforcement for reinforced concrete has a grain size of not more than 4 μm.
17. The 600 MPa-scale rebar for reinforced concrete according to claim 13, wherein the 600 MPa-scale rebar for reinforced concrete has a strength of 600 MPa.
18. The 600MPa grade rebar for reinforced concrete according to claim 13, wherein the nitrogen increasing agent in the 600MPa grade rebar for reinforced concrete mainly comprises ferrosilicon nitride.
19. The method of claim 13, wherein the nitrogen increasing agent in the 600MPa grade steel for reinforced concrete is mainly composed of manganese silicon nitride.
20. The method of claim 13, wherein the nitrogen increasing agent in the 600MPa grade steel for reinforced concrete is manganese iron nitride.
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| CN201911346782.3A CN111088451A (en) | 2019-12-24 | 2019-12-24 | 600 MPa-level steel bar for reinforced concrete and production method thereof |
| LU102372A LU102372B1 (en) | 2019-12-24 | 2020-03-11 | 600MPA CLASS STEEL ROD FOR REINFORCED CONCRETE AND MANUFACTURING METHODS FOR IT |
| PCT/CN2020/078686 WO2021128590A1 (en) | 2019-12-24 | 2020-03-11 | 600 mpa-grade steel bar for reinforced concrete and preparation method therefor |
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Application publication date: 20200501 |