CN113802056A - HRB600 hot-rolled high-strength coiled steel and production method thereof - Google Patents

HRB600 hot-rolled high-strength coiled steel and production method thereof Download PDF

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CN113802056A
CN113802056A CN202110926281.3A CN202110926281A CN113802056A CN 113802056 A CN113802056 A CN 113802056A CN 202110926281 A CN202110926281 A CN 202110926281A CN 113802056 A CN113802056 A CN 113802056A
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steel
strength
rolled high
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贾元海
张俊粉
陈文勇
张春雷
刘效云
王晓飞
范文斌
高玲玲
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HBIS Co Ltd Chengde Branch
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74Temperature control, e.g. by cooling or heating the rolls or the product
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B41/00Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203Cooling
    • B21B45/0209Cooling devices, e.g. using gaseous coolants
    • B21B45/0215Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0224Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/005Heat treatment of ferrous alloys containing Mn
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/008Heat treatment of ferrous alloys containing Si
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • C22C33/06Making ferrous alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/009Pearlite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention relates to HRB600 hot-rolled high-strength spiral shell steel and a production method thereof, wherein the spiral shell steel comprises the following chemical components in percentage by mass: c: 0.18 to 0.28%, Si: 0.40-0.80%, Mn: 0.60-1.00%, P is less than or equal to 0.035%, S is less than or equal to 0.035%, V: 0.13-0.25%, N: 0.020-0.035%, Nb: 0.010-0.040%, and the balance of Fe and inevitable impurities; the production process comprises a steelmaking process and a rolling process, wherein the steelmaking process comprises vanadium-nitrogen and niobium composite microalloying, and the steel rolling process comprises heating, rolling and cooling processes. The HRB600 hot-rolled high-strength coiled steel provided by the invention has the structure of ferrite and pearlite, the grain size reaches more than 11.0 grade, the yield strength is more than or equal to 600MPa, the tensile strength is more than or equal to 750MPa, and the elongation A after fracture is more than or equal to 15.0%.

Description

HRB600 hot-rolled high-strength coiled steel and production method thereof
Technical Field
The invention relates to HRB600 hot-rolled high-strength coiled steel and a production method thereof, belonging to the technical field of metallurgy and processing.
Background
The hot rolled spiral belongs to one kind of hot rolled steel bar, and is a wire rod series product, which is generally used as a reinforcing bar of reinforced concrete and prestressed concrete structures to improve the strength and the deformation resistance of the structures, and is one of the main materials of engineering structures, and widely used in industries such as industry and civil buildings, railways, bridges, highways, water and electricity, ports and the like. Compared with a straight spiral steel bar, the spiral shell can be cut out according to the requirement without rolling by a specific length, so that the spiral shell has wider application.
At present, the highest strength grade specified by the current hot rolled steel bar standard in China reaches 600 MPa. With the continuous development of the construction industry, the strengthening is one of the important trends of the steel bar development, but the improvement of the strength reduces the plasticity and the toughness of the steel. The following difficulties exist for the HRB600 spiral product: (1) the product has narrow process window and is easy to generate abnormal tissues; (2) the yield point of the product is not obvious, and the deviation of yield strength indexes is large. Therefore, how to avoid generating abnormal structures and ensure the stability of yield strength on the premise of ensuring the plasticity and the toughness is a technical problem to be solved in the research and development of the high-strength spiral shell at present.
Disclosure of Invention
The HRB600 hot-rolled high-strength coiled steel and the production method thereof provided by the invention aim to solve the technical problem that the provided HRB600 hot-rolled high-strength coiled steel has the advantages that the product structure is ferrite and pearlite, the grain size reaches above 11.0 grade, the yield strength is more than or equal to 600MPa, the tensile strength is more than or equal to 750MPa, the elongation A after fracture is more than or equal to 15.0%, and the HRB600 hot-rolled high-strength coiled steel has good plasticity, toughness and performance stability.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the HRB600 hot-rolled high-strength disc spiral steel comprises the following components in percentage by mass: c: 0.18 to 0.28%, Si: 0.40-0.80%, Mn: 0.60-1.00%, P is less than or equal to 0.035%, S is less than or equal to 0.035%, V: 0.13-0.25%, N: 0.020-0.035%, Nb: 0.010-0.040%, and the balance of Fe and inevitable impurities.
The production method of the HRB600 hot-rolled high-strength disc spiral steel comprises a steel-making process and a steel rolling process, wherein the production method comprises the following steps: the steel-making process comprises vanadium-nitrogen and niobium composite micro-alloying, and the steel rolling process comprises heating, rolling and cooling processes.
The steel-making process includes extracting vanadium in a converter, adding ferrovanadium nitride and ferroniobium for composite microalloying in the smelting process, adding nitrogen microalloying in the refining process, and continuous casting to form square billet through weak argon blowing.
In the heating procedure of the method, the steel billet is heated in a heating furnace to the temperature of 980-1050 ℃ and then discharged.
The rolling process according to the method of the present invention comprises: the rough rolling starting temperature is 900-970 ℃; the finish rolling starting temperature is 850-890 ℃, and the finish rolling finishing temperature is 950-990 ℃; the spinning starting temperature is 840-880 ℃.
The cooling procedure of the method comprises the steps of opening and closing part of the heat-insulating cover, forcibly cooling to 400-500 ℃ at the cooling speed of 6-9 ℃/S after spinning, slowly cooling by 0.4-1.2 ℃/S after strong cooling, and collecting the coil.
The invention has the beneficial effects that:
the HRB600 hot-rolled high-strength disc spiral steel provided by the invention has the advantages that the product structure is ferrite and pearlite, the grain size reaches more than 11.0 grade, the yield strength is more than or equal to 600MPa, the tensile strength is more than or equal to 750MPa, the elongation A after fracture is more than or equal to 15.0 percent, and the HRB600 hot-rolled high-strength disc spiral steel has good plasticity, toughness and performance stability.
According to the invention, in the smelting and rolling processes, the vanadium and niobium composite micro-alloying and low-temperature rolling technology is adopted, the precipitation temperature and the brittle transition temperature of carbonitrides are reduced, the strength and the toughness of the product are effectively improved, and the performance index of the prepared HRB600 hot-rolled high-strength disc screw meets the requirement.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The HRB600 hot-rolled high-strength disc spiral steel provided by the invention comprises the following chemical components in percentage by mass: c: 0.18 to 0.28%, Si: 0.40-0.80%, Mn: 0.60-1.00%, P, S is less than or equal to 0.035%, V: 0.13-0.25%, N: 0.020-0.035%, Nb: 0.010-0.040%, and the balance of Fe and inevitable impurities.
The invention provides a production method of HRB600 hot-rolled high-strength disc spiral steel, which comprises a steel-making process and a steel rolling process, wherein the production method comprises the following steps: the steel-making process comprises vanadium-nitrogen and niobium composite micro-alloying, and the steel rolling process comprises heating, rolling and cooling processes.
Specifically, the steelmaking process comprises the steps of extracting vanadium in a converter, adding ferrovanadium nitride and ferroniobium into the converter for composite microalloying in the smelting process, adding a micronitrogen alloy into the converter for alloying in the refining process, and performing continuous casting by adopting weak argon blowing to form a square billet.
Specifically, a heating procedure, namely heating the steel billet in a heating furnace to the temperature of 980-1050 ℃ and discharging the steel billet out of the furnace;
a rolling procedure, wherein the rough rolling starting temperature is 900-970 ℃; the finish rolling starting temperature is 850-890 ℃, and the finish rolling finishing temperature is 950-990 ℃; the spinning starting temperature is 840-880 ℃.
And a cooling step, wherein a part of the heat-preservation cover is opened and closed, forced cooling is carried out to 400-500 ℃ at the cooling speed of 6-9 ℃/S after spinning, slow cooling is carried out at the cooling speed of 0.4-1.2 ℃/S after strong cooling is carried out on the part of the heat-preservation cover, and coiling is carried out.
In each example, the process flow used was:
molten iron → converter vanadium extraction → converter smelting → LF refining → square billet casting → 165X 165 square billet → billet inspection → billet cold charging and heating → high-pressure water descaling → rough medium, rolling, pre-finishing rolling unit → water cooling stage → wire laying head → Stelmor cooling line → coil collection → P/F line → inspection → packaging and warehousing.
The present invention will be described in detail with reference to specific examples.
TABLE 1 chemical composition of spiral steel for each example
Figure DEST_PATH_IMAGE001
The balance of iron and inevitable impurities.
Example 1
The chemical composition of the HRB600 hot-rolled high-strength disc spiral steel provided in this example is shown in table 1.
The production process of the HRB600 hot-rolled high-strength disc screw steel provided in this embodiment is as follows:
extracting vanadium in a converter, adding ferrovanadium nitride and ferroniobium for composite microalloying in the converter smelting process, adding a micronitrogen alloy for alloying in the refining process, and continuously casting into a 165mm × 165mm square billet by adopting weak argon blowing; heating the square billet in a heating furnace to 985 ℃, discharging, and descaling by high-pressure water, wherein the rough rolling starting temperature is 903 ℃; cooling the rolled piece to 852 ℃ through water, starting finish rolling, and controlling the finish temperature of the finish rolling to 955 ℃; cooling to 842 deg.C with water, and spinning; after spinning, the steel wire is forced to be cooled to 422 ℃ at the speed of 8.8 ℃/S, and after forced cooling, the 7# -18# heat preservation cover is closed to carry out slow cooling and coil collection at the speed of 0.5 ℃/S.
Example 2
The chemical composition of the HRB600 hot-rolled high-strength disc spiral steel provided in this example is shown in table 1.
The production process of the HRB600 hot-rolled high-strength disc screw steel provided in this embodiment is as follows:
extracting vanadium in a converter, adding ferrovanadium nitride and ferroniobium for composite microalloying in the converter smelting process, adding a micronitrogen alloy for alloying in the refining process, continuously casting and casting into a 165mm × 165mm square billet by adopting weak argon blowing, discharging the square billet after heating to 995 ℃ in a heating furnace, descaling by high-pressure water, and beginning the rough rolling at 916 ℃; cooling the rolled piece to 861 ℃ through water, and starting finish rolling, wherein the finish rolling finishing temperature is controlled to be 964 ℃; cooling to 846 ℃ by passing water to start spinning; after spinning, the steel wire is forced to be cooled to 431 ℃ at the speed of 8.4 ℃/S, and after the forced cooling, the 8# -18# heat preservation cover is closed to carry out slow cooling and coiling at the speed of 0.56 ℃/S.
Example 3
The chemical composition of the HRB600 hot-rolled high-strength disc spiral steel provided in this example is shown in table 1.
The production process of the HRB600 hot-rolled high-strength disc screw steel provided in this embodiment is as follows:
extracting vanadium in a converter, adding ferrovanadium nitride and ferroniobium for composite microalloying in the converter smelting process, adding a micronitrogen alloy for alloying in the refining process, continuously casting and casting into a 165mm x 165mm square billet by adopting weak argon blowing, discharging the square billet after heating to 1005 ℃ in a heating furnace, descaling by high-pressure water, and beginning the rough rolling at 925 ℃; cooling the rolled piece to 869 ℃ through water, and starting finish rolling, wherein the finish rolling finishing temperature is controlled to 970 ℃; cooling to 863 ℃ by passing through water and starting spinning; after spinning, the steel wire is forced to be cooled to 452 ℃ at the speed of 7.8 ℃/S, and after forced cooling, a 9# -18# heat preservation cover is closed to carry out slow cooling and coiling at the speed of 0.64 ℃/S.
Example 4
The chemical composition of the HRB600 hot-rolled high-strength disc spiral steel provided in this example is shown in table 1.
The production process of the HRB600 hot-rolled high-strength disc screw steel provided in this embodiment is as follows:
extracting vanadium in a converter, adding ferrovanadium nitride and ferroniobium for composite microalloying in the converter smelting process, adding a micronitrogen alloy for alloying in the refining process, continuously casting and casting into a 165mm × 165mm square billet by adopting weak argon blowing, discharging the square billet after heating to 1012 ℃ in a heating furnace, descaling by high-pressure water, and carrying out rough rolling at the starting temperature of 937 ℃; cooling the rolled piece to 872 ℃ through water penetration, and starting finish rolling, wherein the finish rolling finishing temperature is controlled to be 971 ℃; cooling to 865 ℃ by passing through water to start spinning; after spinning, the steel wire is forced-cooled to 463 ℃ at the speed of 7.4 ℃/S, and after the forced-cooling, the 10# -18# heat-preservation cover is closed to carry out slow-cooling and coiling at the speed of 0.75 ℃/S.
Example 5
The chemical composition of the HRB600 hot-rolled high-strength disc spiral steel provided in this example is shown in table 1.
The production process of the HRB600 hot-rolled high-strength disc screw steel provided in this embodiment is as follows:
extracting vanadium in a converter, adding ferrovanadium nitride and ferroniobium for composite microalloying in the converter smelting process, adding a micronitrogen alloy for alloying in the refining process, continuously casting and casting into a 165mm × 165mm square billet by adopting weak argon blowing, discharging the square billet after heating to 1023 ℃ in a heating furnace, descaling by high-pressure water, and carrying out rough rolling at 948 ℃; cooling the rolled piece to 879 ℃ through water, and starting finish rolling, wherein the finish rolling finishing temperature is controlled to be 975 ℃; cooling to 872 ℃ by passing through water to start spinning; after spinning, the steel wire is forced to be cooled to 472 ℃ at the speed of 6.9 ℃/S, after the forced cooling, the steel wire is closed to a 11# -18# heat preservation cover, and slow cooling and coiling are carried out at the speed of 0.85 ℃/S.
Example 6
The chemical composition of the HRB600 hot-rolled high-strength disc spiral steel provided in this example is shown in table 1.
The production process of the HRB600 hot-rolled high-strength disc screw steel provided in this embodiment is as follows:
extracting vanadium in a converter, adding ferrovanadium nitride and ferroniobium for composite microalloying in the converter smelting process, adding a micronitrogen alloy for alloying in the refining process, continuously casting and casting into a 165mm × 165mm square billet by adopting weak argon blowing, discharging the square billet after heating to 1037 ℃ in a heating furnace, descaling by high-pressure water, and beginning the rough rolling at 958 ℃; cooling the rolled piece to 885 ℃ by water penetration and starting finish rolling, and controlling the finish rolling temperature to be 984 ℃; cooling to 875 ℃ by passing water, and starting spinning; after spinning, the steel wire is forced to be cooled to 497 ℃ at the speed of 6.0 ℃/S, after the forced cooling, the 12# -18# heat preservation cover is closed, and slow cooling and coiling are carried out at the speed of 1.05 ℃/S.
Example 7
The chemical composition of the HRB600 hot-rolled high-strength disc spiral steel provided in this example is shown in table 1.
The production process of the HRB600 hot-rolled high-strength coiled steel provided by the embodiment is as follows:
extracting vanadium in a converter, adding ferrovanadium nitride and ferroniobium for composite microalloying in the converter smelting process, adding a micronitrogen alloy for alloying in the refining process, continuously casting and casting into a 165mm × 165mm square billet by adopting weak argon blowing, discharging the square billet after heating to 1048 ℃ in a heating furnace, descaling by high-pressure water, and beginning the rough rolling at 968 ℃; cooling the rolled piece to 890 ℃ through water, and starting finish rolling, wherein the finish rolling finishing temperature is controlled to 990 ℃; cooling to 879 deg.C with water, and spinning; after spinning, the steel wire is forced to be cooled to 450 ℃ at the speed of 7.9 ℃/S, and after the forced cooling, the 13# -18# heat preservation cover is closed to carry out slow cooling and coiling at the speed of 1.2 ℃/S.
The hot rolled state indexes of the HRB600 disc spiral steel obtained in each example are shown in Table 2.
TABLE 2 hot-rolled indexes of HRB600 disc spiral steel produced in each example
Figure 892727DEST_PATH_IMAGE002
As can be seen from Table 2, the yield strength of the HRB600 hot-rolled high-strength coil steel prepared in each example is more than or equal to 600MPa, the tensile strength is more than or equal to 750MPa, the elongation A after fracture is more than or equal to 15.0%, the structure is ferrite plus pearlite, the grain size reaches more than 11.0 grade, and all performance indexes meet the requirements.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims (7)

1. The HRB600 hot-rolled high-strength disc spiral steel is characterized by comprising the following chemical components in percentage by mass: c: 0.18 to 0.28%, Si: 0.40-0.80%, Mn: 0.60-1.00%, P is less than or equal to 0.035%, S is less than or equal to 0.035%, V: 0.13-0.25%, N: 0.020-0.035%, Nb: 0.010-0.040%, and the balance of Fe and inevitable impurities.
2. The HRB600 hot-rolled high-strength disc spiral steel as claimed in claim 1, wherein the structure of the disc spiral steel is ferrite plus pearlite, the grain size reaches more than 11.0 grade, the yield strength is more than or equal to 600MPa, the tensile strength is more than or equal to 750MPa, and the elongation A after fracture is more than or equal to 15.0%.
3. The production method of the HRB600 hot-rolled high-strength disc screw steel as claimed in claim 1 or 2, wherein the production method comprises a steel-making process and a rolling process, wherein: the steel-making process comprises vanadium-nitrogen and niobium composite micro-alloying, and the steel rolling process comprises heating, rolling and cooling processes.
4. The method for producing the HRB600 hot-rolled high-strength disc spiral steel as claimed in claim 3, wherein the steel-making process comprises extracting vanadium in a converter, adding ferrovanadium nitride and ferroniobium into the converter for composite micro-alloying in the smelting process, adding a micro-nitrogen alloy into the converter for alloying in the refining process, and continuously casting the alloy into a square billet by adopting weak argon blowing.
5. The method for producing the HRB600 hot-rolled high-strength coiled steel as claimed in claim 3, wherein the heating step comprises heating the steel slab in a heating furnace to a slab temperature of 980-1050 ℃ and tapping the steel slab.
6. The method for producing the HRB600 hot-rolled high-strength disc screw steel as claimed in claim 3, wherein the rolling process comprises the steps of rough rolling starting temperature of 900-970 ℃, finish rolling starting temperature of 850-890 ℃, finish rolling finishing temperature of 950-990 ℃ and spinning starting temperature of 840-880 ℃.
7. The method for producing the HRB600 hot-rolled high-strength coiled steel as claimed in claim 3, wherein the cooling process comprises opening and closing part of the heat-insulating cover, performing forced cooling at a cooling rate of 6-9 ℃/S to 400-500 ℃ after spinning, closing part of the heat-insulating cover after strong cooling, performing slow cooling at a cooling rate of 0.4-1.2 ℃/S, and collecting coils.
CN202110926281.3A 2021-08-12 2021-08-12 HRB600 hot-rolled high-strength coiled steel and production method thereof Pending CN113802056A (en)

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CN114505341A (en) * 2021-12-27 2022-05-17 石横特钢集团有限公司 Hot rolling process method for reinforcing steel bars of dense-pitch threaded rib anchor rod
CN114875316A (en) * 2022-04-26 2022-08-09 湖南华菱湘潭钢铁有限公司 High-strength deformed steel bar HRB600 and production method thereof
CN114892076A (en) * 2022-04-26 2022-08-12 湖南华菱湘潭钢铁有限公司 Production method of non-quenched and tempered cold heading steel wire rod for 8.8-grade bolt

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CN106086635A (en) * 2016-06-15 2016-11-09 河北钢铁股份有限公司承德分公司 A kind of 600MPa grade high-strength hot-rolled antidetonation valve snail and production method thereof
CN109234637A (en) * 2018-10-30 2019-01-18 河钢股份有限公司承德分公司 A kind of Korea Spro marks SD600 valve snail steel and its production method

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CN114505341A (en) * 2021-12-27 2022-05-17 石横特钢集团有限公司 Hot rolling process method for reinforcing steel bars of dense-pitch threaded rib anchor rod
CN114875316A (en) * 2022-04-26 2022-08-09 湖南华菱湘潭钢铁有限公司 High-strength deformed steel bar HRB600 and production method thereof
CN114892076A (en) * 2022-04-26 2022-08-12 湖南华菱湘潭钢铁有限公司 Production method of non-quenched and tempered cold heading steel wire rod for 8.8-grade bolt

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