CN109092891B - Production method of 400Mpa grade superfine crystal grain steel ribbed steel bar wire rod - Google Patents
Production method of 400Mpa grade superfine crystal grain steel ribbed steel bar wire rod Download PDFInfo
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- CN109092891B CN109092891B CN201810763610.5A CN201810763610A CN109092891B CN 109092891 B CN109092891 B CN 109092891B CN 201810763610 A CN201810763610 A CN 201810763610A CN 109092891 B CN109092891 B CN 109092891B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 239000013078 crystal Substances 0.000 title description 3
- 238000005096 rolling process Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 230000032683 aging Effects 0.000 claims abstract description 9
- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 2
- 238000009987 spinning Methods 0.000 abstract description 16
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 6
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 4
- 239000010962 carbon steel Substances 0.000 abstract description 4
- 229910000734 martensite Inorganic materials 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 235000013619 trace mineral Nutrition 0.000 abstract description 2
- 239000011573 trace mineral Substances 0.000 abstract description 2
- 230000035515 penetration Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
Classifications
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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
- B21B1/16—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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a method for producing a normal carbon steel wire rod of 400Mpa grade ultra-fine grain steel ribbed steel bar without adding trace elements (Nb, V, Ti and Mn) in the metallurgical industry. The method is specifically prepared by adopting the processes of low-temperature rolling, inter-machine cooling of a finishing mill group, low-temperature finish rolling, low-temperature spinning, stelmor line forced air cooling and artificial aging. Because the synchronous clamping and steel feeding process of the front pinch roll of the wire laying machine is adopted, the power and the stability of the front pinch roll of the wire laying machine are improved, and therefore, the 400 Mpa-grade ultra-fine grain steel ribbed steel bar wire rod can be stably produced under the condition that no microalloy elements (Nb, V, Ti and Mn) are added; compared with the conventional process, the method has the characteristics of uniform grain refinement, stable performance, no martensite structure, capability of meeting the requirement of anti-seismic reinforcing steel bars, energy conservation, low production cost and the like.
Description
Technical Field
The invention relates to a production method of a 400 Mpa-grade ultrafine grain steel ribbed steel bar wire rod in the metallurgical industry, in particular to a production method of a common carbon steel 400 Mpa-grade ultrafine grain steel ribbed steel bar wire rod which is not added with trace elements (Nb, V, Ti and Mn), has the characteristics of uniform grain refinement, stable performance, no martensite structure, capability of meeting the requirement of anti-seismic steel bars, energy conservation, low production cost and the like.
Background
The front pinch roll of the wire-feeding machine is a key device of a high-speed wire production line in the metallurgical industry, and is used for the important function of smoothly guiding finished wires from a rolling mill into the wire-feeding machine. The device is mainly used for braking the small-specification tail part (preventing high-speed tail flicking) and clamping and conveying the large-specification tail part (enabling the large-specification tail part to be smoothly discharged out of a wire laying machine) when round steel wires are produced.
When the ribbed steel bar wire rod is produced under the condition of high-temperature (not less than 900 ℃) spinning temperature), the water penetration resistance is small because the temperature drop after rolling is not large and the water penetration amount is small, and the stable production can be realized by using the conventional clamping and conveying technology (the clamping force is 1.0-4.5 bar). However, when the ribbed steel wire rod is produced under the condition of low-temperature (less than 750 ℃) spinning temperature) spinning process, the water penetration resistance is large due to large temperature drop and large water penetration amount after rolling, the conventional pinch technology (the clamping force is 1.0-4.5bar) cannot provide enough power, the water penetration resistance is difficult to offset, and frequent steel piling occurs in a high-speed area, so that normal production cannot be realized. Just for the reasons, the ribbed steel wire rods produced at home and abroad at present adopt a high-temperature spinning technology with a spinning temperature higher than 690 ℃, which results in that: the method can not produce similar products such as a 400 Mpa-grade ribbed steel bar wire rod and the like by using common carbon steel without adding any micro-alloy elements (Nb, V, Ti and Mn), and only can adopt a method of adding the micro-alloy elements (Nb, V, Ti and Mn) or adding Si strengthening elements to improve the strength so as to realize the production of high-strength steel bars such as the 400 Mpa-grade steel bars; the strength of the steel bar is improved by adding microalloy elements (Nb, V, Ti and Mn) or Si strengthening elements, so that the production process is complicated, and the cost of the steel bar is increased.
In foreign countries, countries such as Europe and America and the like, the post-rolling waste heat quenching process is mainly adopted to improve the strength of steel. Compared with alloy reinforced products, the products produced by the process have the advantages of reduced plasticity, poorer welding performance and lower yield ratio.
In China, the steel is mainly used for buildings, because the steel produced by the waste heat quenching process has poor welding performance, only mechanical connection can be adopted during construction, but China is in an earthquake frequency region, and most of steel bars in engineering construction adopt the welding connection process, so products produced by the waste heat quenching process are difficult to popularize and apply in China.
In the building engineering, the grade of the reinforcing steel bars is improved, the using amount of the reinforcing steel bars can be effectively reduced (the using amount of the III-grade reinforcing steel bars used in the same building engineering can be reduced by 12-15 percent compared with the using amount of the II-grade reinforcing steel bars), and meanwhile, the workload of reinforcing steel bar welding, prefabrication, transportation and the like is reduced, the fluidity of concrete is favorably improved, the working efficiency is improved, and the building cost is effectively reduced.
Disclosure of Invention
The invention aims to provide a production method of 400 Mpa-grade ultrafine grain steel ribbed steel wire rods, which can realize the stable production of the common carbon steel 400 Mpa-grade ultrafine grain steel ribbed steel wire rods under the process conditions of low-temperature rolling, synchronous clamping and steel conveying process of pinch rolls before spinning, Steyr molar line forced air cooling and artificial aging under the condition of not adding microalloy elements (Nb, V, Ti and Mn).
In order to achieve the purpose, the invention adopts the technical scheme that: the process method comprises the steps of low-temperature rolling, inter-machine cooling of a finishing mill set, low-temperature finish rolling, synchronous clamping and steel feeding of a front pinch roll of a wire laying machine, low-temperature wire laying, stelmor line forced air cooling and artificial aging.
The rolling process adopts the production process of low rolling temperature, low finishing mill temperature, inter-machine cooling and low spinning temperature, the heating temperature of the steel bar production is reduced to 900-1000 ℃ from 1000-1200 ℃, the rolling temperature of the finishing rolling area is reduced to 900 ℃ from 950-.
The high-speed area adopts a process of synchronously clamping and feeding steel by a pinch roll before spinning. The pinch roll air source is improved by optimizing hole patterns, moment amplitude limiting values and pinch roll lead coefficients in an idle state and additionally arranging a booster pump, so that the clamping pressure of the pinch roll is increased to 5.0-7.0bar from the previous 1.0-4.5bar, and the problems that when ribbed steel bar coils are produced under the condition of a low-temperature (less than 750 ℃) spinning process, due to large water penetration resistance, sufficient power cannot be provided by a conventional pinch technology (clamping force is 1.0-4.5bar), and steel cannot be normally produced by frequent steel piling in a high-speed area are solved.
After spinning, forced air cooling and artificial aging processes of Stelmor lines are adopted. 5-8 Stelmor fans are started after spinning, the opening degree is 50% -100%, and artificial aging is carried out through heat preservation of a heat preservation cover after forced air cooling, so that not only are crystal grains further refined, the performance is stabilized, but also abnormal structures in the low-temperature rolling process are eliminated.
Therefore, the invention can produce 400Mpa grade ultra-fine grain steel bar with rib wire rods without adding microalloy elements (Nb, V, Ti, Mn), has the characteristics of uniform grain refinement, stable performance, no martensite structure, meeting the requirement of anti-seismic steel bars, energy saving, low production cost and the like, and compared with the condition of adding microalloy elements (Nb, V, Ti, Mn), the indexes of the steel bars such as yield strength, tensile strength and the like are not obviously reduced, but the cost of raw materials is obviously saved, and the production cost of steel billets is reduced.
Detailed Description
The method adopts the processes of low rolling start temperature, low finishing mill temperature, inter-machine cooling, synchronous clamping and steel feeding of pinch rolls before spinning, low spinning temperature, stelmor line forced air cooling and artificial aging, and produces qualified 400 Mpa-grade ultra-fine grain steel ribbed steel wire rods under the condition of not adding microalloy elements (Nb, V, Ti and Mn).
Embodiment one, rolling HRB400Mpa grade phi 6mm ultra-fine grain steel bar with ribs and wire rods:
selecting a steel billet with the chemical components of 0.21-0.25 percent of C, 0.10-0.30 percent of Si, less than or equal to 0.045 percent of P and less than or equal to 0.045 percent of S; the initial rolling temperature is 900-.
Example two, rolling a HRB400Mpa grade ultra-fine grain steel bar with ribs and with phi 8mm steel wire rod:
selecting a steel billet with the chemical components of 0.21-0.25 percent of C, 0.10-0.30 percent of Si, less than or equal to 0.045 percent of P and less than or equal to 0.045 percent of S; the initial rolling temperature is 900-1000 ℃, the finishing mill temperature is 750-850 ℃, the spinning temperature is controlled at 740 ℃, the air inlet pressure of the pinch roll is adjusted to be more than 7.0bar, the clamping force of the pinch roll is adjusted to be 6.0-7.0bar, the torque amplitude limit of the pinch roll is adjusted to be 60-75%, 5 stelmor fans are started, the opening degree of the fans is 5 multiplied by 100%, the 6 th and all the following heat preservation covers on a stelmor air cooling line are closed, and the HRB400Mpa grade phi 8mm ultrafine grain steel ribbed steel wire rod can be produced.
Example three, rolling a HRB400Mpa grade phi 12mm ultra-fine grain steel bar with ribs and wire rods:
selecting a steel billet with the chemical components of 0.21-0.25 percent of C, 0.10-0.30 percent of Si, less than or equal to 0.045 percent of P and less than or equal to 0.045 percent of S; the initial rolling temperature is 900-.
Therefore, the invention greatly reduces the energy consumption and saves the energy through the processes of low initial rolling temperature, low spinning temperature, stelmor forced cooling and artificial aging; secondly, the grains of the austenite recrystallization can be prevented from being coarse, so that the grains of the product are more refined and more uniform, thereby achieving the purpose of improving the strength of the product. Therefore, the invention can produce 400Mpa grade ultra-fine grain steel bar with rib steel wire rod without adding microalloy elements (Nb, V, Ti, Mn), has the characteristics of uniform grain refinement, stable performance, no martensite structure, meeting the requirement of anti-seismic steel bar, energy saving, low production cost and the like, and has the yield strength of up to 600MPa, the tensile strength of 750Mpa and the elongation of 35 percent.
The above-described embodiments should not be construed as limiting the scope of the invention, and any alternative modifications or alterations to the embodiments of the present invention will be apparent to those skilled in the art. The present invention is not described in detail, but is known to those skilled in the art.
Claims (1)
1. A production method of 400Mpa grade ultra-fine grain steel bar with ribs and steel wire rods is characterized in that: selecting a steel billet with chemical components of less than or equal to 0.25 percent of C, less than or equal to 0.30 percent of Si, less than or equal to 0.045 percent of P, less than or equal to 0.045 percent of S and without adding any Nb, V, Ti and Mn microalloy elements as raw materials, adopting the processes of ' low-temperature start rolling, inter-finishing cooling of a finishing mill group, low-temperature finish rolling, synchronous clamping and steel conveying of a front pinch roll of a wire laying machine ', low-temperature wire laying, forced air cooling of a Steyr line and artificial aging ', wherein the start rolling temperature of the low-temperature start rolling is 900-, and closing the heat preservation cover after stelmor forced air cooling, and carrying out artificial heat preservation and aging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810763610.5A CN109092891B (en) | 2018-07-12 | 2018-07-12 | Production method of 400Mpa grade superfine crystal grain steel ribbed steel bar wire rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810763610.5A CN109092891B (en) | 2018-07-12 | 2018-07-12 | Production method of 400Mpa grade superfine crystal grain steel ribbed steel bar wire rod |
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| CN109092891A CN109092891A (en) | 2018-12-28 |
| CN109092891B true CN109092891B (en) | 2020-01-03 |
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Families Citing this family (3)
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| CN110885952A (en) * | 2019-12-16 | 2020-03-17 | 本钢板材股份有限公司 | 400 MPa-grade hot-rolled ribbed steel bar and preparation method thereof |
| CN111394560A (en) * | 2020-03-31 | 2020-07-10 | 湖南华菱湘潭钢铁有限公司 | Production method of hot-rolled ribbed steel bar |
| CN111485087A (en) * | 2020-05-18 | 2020-08-04 | 南京钢铁股份有限公司 | Preparation method of 10.9-grade SCM435 non-quenched and tempered bolt steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1745918A (en) * | 2004-09-07 | 2006-03-15 | 安阳钢铁集团有限责任公司 | Production of ultra-fine crystal hot-rolled ribbed reinforcing rob |
| CN101015839A (en) * | 2007-02-14 | 2007-08-15 | 山东石横特钢集团有限公司 | Laying head front nip and feed technique for producing wire roll with high speed under low temperature |
| CN101185938A (en) * | 2006-11-09 | 2008-05-28 | 钢铁研究总院 | Method for producing steel bar with rib |
| CN104561731A (en) * | 2014-12-28 | 2015-04-29 | 首钢总公司 | Production method of high-tenacity 65Mn spring steel with uniform whole wire rod property |
| CN106282778A (en) * | 2016-09-19 | 2017-01-04 | 山东石横特钢集团有限公司 | Ultra-fine grain steel Ribbed Bar wire rod and production technology thereof |
-
2018
- 2018-07-12 CN CN201810763610.5A patent/CN109092891B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1745918A (en) * | 2004-09-07 | 2006-03-15 | 安阳钢铁集团有限责任公司 | Production of ultra-fine crystal hot-rolled ribbed reinforcing rob |
| CN101185938A (en) * | 2006-11-09 | 2008-05-28 | 钢铁研究总院 | Method for producing steel bar with rib |
| CN101015839A (en) * | 2007-02-14 | 2007-08-15 | 山东石横特钢集团有限公司 | Laying head front nip and feed technique for producing wire roll with high speed under low temperature |
| CN104561731A (en) * | 2014-12-28 | 2015-04-29 | 首钢总公司 | Production method of high-tenacity 65Mn spring steel with uniform whole wire rod property |
| CN106282778A (en) * | 2016-09-19 | 2017-01-04 | 山东石横特钢集团有限公司 | Ultra-fine grain steel Ribbed Bar wire rod and production technology thereof |
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| CN109092891A (en) | 2018-12-28 |
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Application publication date: 20181228 Assignee: XINJIANG KUNYU STEEL Co.,Ltd. Assignor: SHIHENG SPECIAL STEEL GROUP Co.,Ltd. Contract record no.: X2021980014561 Denomination of invention: Production method of 400MPa ultra-fine grain steel belt rib reinforcement wire rod Granted publication date: 20200103 License type: Common License Record date: 20211210 |
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Denomination of invention: The production method of 400Mpa grade ultra-fine grain steel ribbed steel wire rod Effective date of registration: 20231222 Granted publication date: 20200103 Pledgee: Industrial and Commercial Bank of China Limited Feicheng sub branch Pledgor: SHIHENG SPECIAL STEEL GROUP Co.,Ltd. Registration number: Y2023980073806 |