CN112742864A - Production process of cold-rolled steel bar - Google Patents
Production process of cold-rolled steel bar Download PDFInfo
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- CN112742864A CN112742864A CN202011400762.2A CN202011400762A CN112742864A CN 112742864 A CN112742864 A CN 112742864A CN 202011400762 A CN202011400762 A CN 202011400762A CN 112742864 A CN112742864 A CN 112742864A
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- Prior art keywords
- rolling
- steel bar
- heat treatment
- cold
- reducing
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/08—Diameter
Abstract
A production process of a cold-rolled steel bar comprises a rolling process and a heat treatment process, wherein the heat treatment process is positioned before the rolling process, the steel bar entering the rolling process is subjected to heat treatment in the heat treatment process, the heat treatment temperature is 220-550 ℃, the heating time is 0.2-5 seconds, and only one heat treatment process with the heating temperature higher than 200 ℃ is adopted in the production process. The cold rolled steel bar produced by the process has the advantages that A of all products produced by the process is A under the condition that the strength index is improved to a certain extent5.65The steel is more than or equal to 16 percent, the Agt is more than or equal to 6.0 percent, the plasticity and toughness indexes are obviously improved, the rolling energy consumption can be reduced by about 10 to 15 percent, and the average power consumption of each specification per ton of steel is reduced by 4 to 8 degrees.
Description
Technical Field
The invention relates to a production technology of cold-rolled ribbed steel bars, in particular to a production technology of cold-rolled steel bars, and belongs to the technical field of steel bar rolling.
Background
The existing cold rolling production technology adopts the technical means disclosed in the patent CN 201110114872: reducing the diameter of the Q215 or Q235 disc by a rolling mill, wherein the reducing ratio is 0.79-0.87; reducing the diameter of the steel plate by a second rolling mill and simultaneously scoring, wherein the diameter reduction ratio is 0.59-0.88; meanwhile, the steel bar after being scored is subjected to heat treatment for 1-3s at the temperature of 550-670 ℃; the steel bars after heat treatment (soaking) are naturally cooled in the air, and after the ordinary I, II-grade steel bars are treated by the process, the internal structure and the grain size of the steel bars are changed, so that the strength and the elongation of the steel bars are improved and are close to IV-grade steel bars compared with III-grade steel. Trace elements such as titanium, niobium and vanadium are not required to be added, so that the content of the titanium, the niobium and the vanadium is reducedThe amount of rare metals. The technical scheme is adopted to produce the high-ductility cold-rolled ribbed steel bar, a typical product is CRB600H, and the mechanical properties are as follows: rp0.2≥540MPa，Rm≥600MPa，A5.65Not less than 14%, Agt not less than 5.0%, Rm/Rp0.2 not less than 1.05. The product is subjected to cold plastic deformation and heat treatment on the basis of common carbon steel, the comprehensive mechanical property is greatly improved, compared with a hot rolled product, the strength index of the steel bar is very obvious, but the toughness and plasticity indexes of the steel bar have certain limitations, and compared with the performance indexes of an alloyed steel bar and an anti-seismic steel bar in a common hot rolling process, the performance indexes of the alloyed steel bar and the anti-seismic steel bar have a large difference. For example: the product produced by the current production process requires A5.65Not less than 14 percent, and the product A is counted by inspection tests in the production practice for many years5.65Not less than 14%, A of 75% of the samples measured5.65The value is between 14% and 15%, another 15% of the samples measured is between 15% and 16%, and 10% of the samples measured is A5.65Value greater than 16%, A of the individual samples5.65The value can also reach more than 18 percent, the Agt of all samples can be realized by more than or equal to 5.0 percent, but the Agt value of 87 percent of measured products is between 5.0 percent and 6.0 percent, and only the Agt value of about 13 percent of measured products is more than 6.0 percent, so that although a small part of products have better toughness and plasticity in the existing production method, the products with the performance can not be distinguished from all products in large-scale production, the whole CRB600H steel bar can not be developed and applied to occasions (such as anti-seismic steel bars) with higher requirements on toughness and plasticity, therefore, the distribution of the toughness and plasticity indexes at present limits the application occasions of the CRB600H steel bar, in addition, the steel bar is rolled and deformed under the normal temperature condition, the deformation resistance of the steel bar is larger, the energy consumption of the rolling process is higher, the average rolling power consumption (electric consumption) of each ton of steel bar is about 35 degrees, and the diameter of the existing cold-rolled ribbed steel bar is maximum 12mm, and then large-sized products cannot be produced. Although some technical schemes adopted in some documents can improve the strength and the elongation, the distribution of various performance indexes of the product after the product performance test spans a large range, even if some products can reach some higher indexes, the product has low performance indexes and is similar to a pipeThe wood barrel effect in science, the application occasion of the whole batch of products is determined by the product with the lowest performance index, and the development of a production process method capable of overcoming the product short plate is an effective way for solving the problem.
Disclosure of Invention
The invention aims to overcome the problems of products obtained by the existing cold-rolled steel bar production process and provide a cold-rolled steel bar production process.
In order to realize the purpose of the invention, the following technical scheme is adopted: a production process of a cold-rolled steel bar comprises a rolling process and a heat treatment process, wherein the heat treatment process is positioned before the rolling process, the steel bar entering the rolling process is subjected to heat treatment in the heat treatment process, the heat treatment temperature is 220-550 ℃, the heating time is 0.2-5 seconds, and only one heat treatment process with the heating temperature higher than 200 ℃ is adopted in the production process.
Further, the method comprises the following steps of; the heating treatment temperature is 280-460 ℃, and the heating time is 1-5 seconds.
Further, the method comprises the following steps of; the rolling process comprises reducing rolling and forming rolling, wherein the reducing ratio of the reducing rolling is as follows: 0.79-0.87, adopting one or more rolling processes, and if the rolling processes are adopted, finishing the target reduction by 0.3 in the last rolling process; the other rolling processes finish the target reducing amount by 0.7, and the reducing ratio during the forming rolling forming is as follows: 0.6-0.9.
Further, the method comprises the following steps of; the diameter range of the steel bar is phi 5 mm-phi 16 mm.
Further, the method comprises the following steps of; the reinforcing steel bar Rp produced by the method0.2≥550MPa、Rm≥620MPa、A5.65≥16%、Agt≥6.0％、Rm/ Rp0.2≥1.1。
The invention has the positive and beneficial technical effects that: by adopting the production process, the heat treatment process carried out after the forming rolling in the original cold rolling process is changed to be before the reducing rolling, and the cold-rolled steel bar produced by the process has the advantages that the A of all products produced by the process is improved to a certain extent under the condition that the strength index is improved5.65Not less than 16%, Agt not less than 6.0%, and plasticity and toughness indexes thereofThe method has the advantages that the method is obviously improved, the integral product can be applied and developed to the direction of anti-seismic steel bars in large batch, the steel bars are heated before reducing rolling, and are rolled under the condition of higher temperature, compared with the existing cold rolling process, the deformation resistance of the steel bars during rolling is reduced, the rolling energy consumption is reduced by about 10-15%, and the average power consumption of each specification per ton of steel is reduced by 4-8 ℃.
Detailed Description
In order to more fully explain the implementation of the present invention, the implementation examples of the present invention are provided, which are merely illustrative of the present invention and do not limit the scope of the present invention.
The processes in the following examples are all carried out in the existing cold rolling line, and the present process can be carried out by shifting from after rolling to before rolling through the heat treatment process in the existing cold rolling line.
Example 1:
the method is characterized in that a hot-rolled plain carbon steel disc strip with the specific mark of Q235 is taken as a raw material, the diameter phi of the disc strip is 10mm, the disc strip is subjected to butt welding and descaling treatment from head to tail, then enters a heating furnace of a heat treatment process, the heating temperature is controlled at 350 ℃, the heating time is 1.8S, and after heating, reducing rolling and forming rolling are sequentially carried out. Wherein the reducing ratio of reducing rolling is 0.85, and a rolling process is adopted. The reduction ratio of the forming rolling is 0.61, and the rolling is one-pass rolling. And (4) naturally cooling the rolled and formed steel bar in air to obtain a high-performance steel bar product.
Example 2:
the hot-rolled plain steel disc strip with the specific mark of HPB300 plain carbon steel is used as a raw material, the diameter phi of the hot-rolled plain steel disc strip is 10mm, the hot-rolled plain steel disc strip is subjected to butt welding and descaling treatment from head to tail, then enters a heating furnace of a heat treatment process, the heating temperature is controlled at 390 ℃, the heating time is 2S, and after heating, reducing rolling and forming rolling are sequentially carried out. Wherein the reducing ratio of reducing rolling is 0.83, and a rolling process is adopted. The reduction ratio of the forming rolling is 0.62, and the rolling is one-pass rolling. And (4) naturally cooling the rolled and formed steel bar in air to obtain a high-performance steel bar product.
Example 3:
the method comprises the steps of taking a Q235 plain carbon steel hot-rolled smooth disc strip as a raw material, selecting a diameter phi 12mm for production, carrying out end-to-end welding connection and descaling treatment on the disc strip, then feeding the disc strip into a heating furnace of a heat treatment process, controlling the heating temperature at 430 ℃ for 2.6S, and carrying out reducing rolling and forming rolling in sequence after heating. Wherein the reducing ratio of reducing rolling is 0.85, and a rolling process is adopted. The reduction ratio of the forming rolling is 0.6, and the one-pass rolling is adopted. And (4) naturally cooling the rolled and formed steel bar in air to obtain a high-performance steel bar product.
Example 4:
the hot-rolled plain carbon steel disc strip with the specific mark of HPB300 is used as a raw material, the diameter phi 16mm is selected for production, the disc strip is subjected to butt welding and descaling treatment from head to tail, then enters a heating furnace of a heat treatment process, the heating temperature is controlled at 450 ℃, the heating time is 3S, and after heating, reducing rolling and forming rolling are sequentially carried out. Wherein the reducing ratio of reducing rolling is 0.83, and a rolling process is adopted. The reduction ratio of the forming rolling is 0.62, and the rolling is one-pass rolling. And (4) naturally cooling the rolled and formed steel bar in air to obtain a high-performance steel bar product.
Example 5:
the method is characterized in that a hot-rolled plain carbon steel disc strip with the specific mark of Q235 is taken as a raw material, the diameter phi of the disc strip is 10mm, the disc strip is subjected to butt welding and descaling treatment from head to tail, then enters a heating furnace of a heat treatment process, the heating temperature is controlled at 360 ℃, the heating time is 1.8S, and after heating, reducing rolling and forming rolling are sequentially carried out. Wherein the reducing ratio of reducing rolling is 0.85, two reducing rolling processes are adopted, the first reducing amount is 70%, and the second reducing amount is 30%. The reducing ratio of the forming rolling is 0.61, and the rolling is one-pass rolling. And (4) naturally cooling the rolled and formed steel bar in air to obtain a high-performance steel bar product.
The cold-rolled steel bar product can be obtained by changing the heating temperature at 250 ℃, 300 ℃ and 520 ℃ under the process.
After the products of the above examples are mixed, 100 samples are selected for testing, and all samples achieve Rp0.2≥550MPa、Rm≥620MPa、A5.65≥16%、Agt≥6.0％、Rm/ Rp0.2Not less than 1.1, wherein Rp0.2Average value of 558 MPa, RmAverage value 625 MPa; 100% of sample A5.65≥16%、Agt is more than or equal to 6.0 percent, wherein 85 percent of samples A are measured5.65The value is between 16% and 17%, the rest is greater than 17%; the Agt value of a 68% measurement sample is more than 6.5%, and the toughness and plasticity indexes of the steel bar produced by the method are greatly improved while the steel bar meets the CRB600H standard requirement.
Compared with the traditional cold-rolled steel bar production method, the method moves the heat treatment process to the process before reducing rolling, and integrally improves the toughness and plasticity indexes of the rolled product after heating, effectively improves the consistency of the product, and achieves the unexpected technical effect.
After the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and it is intended that all simple modifications, equivalent changes and modifications made to the above embodiments based on the technical spirit of the present invention shall fall within the technical scope of the present invention, and the present invention shall not be limited to the embodiments illustrated in the description.
Claims (5)
1. The production process of the cold-rolled steel bar comprises a rolling process and a heat treatment process, and is characterized in that: the heat treatment process is positioned before the rolling process, the steel bar entering the rolling process is subjected to heat treatment in the heat treatment process, the heat treatment temperature is 220-550 ℃, the heating time is 0.2-5 seconds, and only one heat treatment process with the heating temperature higher than 200 ℃ is required in the production process.
2. The process of claim 1, wherein the cold-rolled steel bar is produced by the following steps: the heating treatment temperature is 280-460 ℃, and the heating time is 1-5 seconds.
3. The process of claim 1, wherein the cold-rolled steel bar is produced by the following steps: the rolling process comprises reducing rolling and forming rolling, wherein the reducing ratio of the reducing rolling is as follows: 0.79-0.87, adopting one or more rolling processes, and if the rolling processes are adopted, finishing the target reduction by 0.3 in the last rolling process; the other rolling processes finish the target reducing amount by 0.7, and the reducing ratio during the forming rolling forming is as follows: 0.6-0.9.
4. The process of claim 1, wherein the cold-rolled steel bar is produced by the following steps: the diameter range of the steel bar is phi 5 mm-phi 16 mm.
5. The process of claim 1, wherein the cold-rolled steel bar is produced by the following steps: the reinforcing steel bar Rp produced by the method0.2≥550MPa、Rm≥620MPa、A5.65≥16%、Agt≥6.0％、Rm/ Rp0.2≥1.1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011400762.2A CN112742864A (en) | 2020-12-04 | 2020-12-04 | Production process of cold-rolled steel bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011400762.2A CN112742864A (en) | 2020-12-04 | 2020-12-04 | Production process of cold-rolled steel bar |
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| CN112742864A true CN112742864A (en) | 2021-05-04 |
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| CN202011400762.2A Withdrawn CN112742864A (en) | 2020-12-04 | 2020-12-04 | Production process of cold-rolled steel bar |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045040A (en) * | 1990-04-05 | 1990-09-05 | 冶金工业部钢铁研究总院 | Cold rolling strap helps (screw thread) reinforcing bar producing device and technology |
| CN1068371A (en) * | 1992-07-06 | 1993-01-27 | 冶金工业部钢铁研究总院 | Improve the method and the device of elongation of cold-worked wire rod |
| CN1097659A (en) * | 1994-05-25 | 1995-01-25 | 冶金工业部钢铁研究总院 | The warm rolling method of spiral |
| JP2000144247A (en) * | 1998-11-13 | 2000-05-26 | Tokyo Tekko Co Ltd | Production of high strength reinforcing bar |
| JP2011011245A (en) * | 2009-07-03 | 2011-01-20 | Nippon Steel Corp | Continuous thermo-mechanical treatment line of medium-high carbon steel wire rod |
| CN201751022U (en) * | 2010-04-28 | 2011-02-23 | 洛阳璋泰非标机械有限公司 | Equipment for forming hollow anchor rods at one step by reducing hot rolling |
| CN102212667A (en) * | 2011-05-05 | 2011-10-12 | 安阳市合力高速冷轧有限公司 | Production process of high-ductility cold-rolled ribbed steel bars |
| CN102382950A (en) * | 2011-11-08 | 2012-03-21 | 建科机械（天津）股份有限公司 | Conductive wheel electric heating device for cold-rolled ribbed steel bar production line |
| CN107185995A (en) * | 2017-07-20 | 2017-09-22 | 四川桂利节能科技有限公司 | A kind of cold rolled reinforcing steel bar with ribs processing technology |
| CN111097796A (en) * | 2019-03-13 | 2020-05-05 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Production system and production method of high-ductility ribbed steel bar |
-
2020
- 2020-12-04 CN CN202011400762.2A patent/CN112742864A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045040A (en) * | 1990-04-05 | 1990-09-05 | 冶金工业部钢铁研究总院 | Cold rolling strap helps (screw thread) reinforcing bar producing device and technology |
| CN1068371A (en) * | 1992-07-06 | 1993-01-27 | 冶金工业部钢铁研究总院 | Improve the method and the device of elongation of cold-worked wire rod |
| CN1097659A (en) * | 1994-05-25 | 1995-01-25 | 冶金工业部钢铁研究总院 | The warm rolling method of spiral |
| JP2000144247A (en) * | 1998-11-13 | 2000-05-26 | Tokyo Tekko Co Ltd | Production of high strength reinforcing bar |
| JP2011011245A (en) * | 2009-07-03 | 2011-01-20 | Nippon Steel Corp | Continuous thermo-mechanical treatment line of medium-high carbon steel wire rod |
| CN201751022U (en) * | 2010-04-28 | 2011-02-23 | 洛阳璋泰非标机械有限公司 | Equipment for forming hollow anchor rods at one step by reducing hot rolling |
| CN102212667A (en) * | 2011-05-05 | 2011-10-12 | 安阳市合力高速冷轧有限公司 | Production process of high-ductility cold-rolled ribbed steel bars |
| CN102382950A (en) * | 2011-11-08 | 2012-03-21 | 建科机械（天津）股份有限公司 | Conductive wheel electric heating device for cold-rolled ribbed steel bar production line |
| CN107185995A (en) * | 2017-07-20 | 2017-09-22 | 四川桂利节能科技有限公司 | A kind of cold rolled reinforcing steel bar with ribs processing technology |
| CN111097796A (en) * | 2019-03-13 | 2020-05-05 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Production system and production method of high-ductility ribbed steel bar |
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Application publication date: 20210504 |