CN115948691A - Production method of low-silicon HRB400E steel bar - Google Patents
Production method of low-silicon HRB400E steel bar Download PDFInfo
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Abstract
The invention relates to a production method of a low-silicon HRB400E steel bar, wherein the low-silicon HRB400E steel bar comprises the following elements in percentage by weight: 0.20 to 0.25% by weight of C,0.10 to 0.30% by weight of Si,1.20 to 1.60% by weight of Mn,0.015 to 0.030% by weight of V,0.008 to 0.012% by weight of N, and the balance of iron and inevitable impurity elements, the method for producing a low-silicon HRB400E steel bar comprising the steps of: s1: heating a casting blank containing elements in a low-silicon HRB400E steel bar to 980-1150 ℃, wherein the temperature difference between the inside and the outside of the casting blank is less than or equal to 15 ℃; s2: rolling the heated casting blank, reducing the initial rolling temperature to 950-1050 ℃, realizing recrystallization rolling by rough and medium rolling, and repeatedly rolling and recrystallizing a rolled piece to obtain a finished product; s3: the finished product material is cooled in a grading way to enable the rolled piece to be rapidly cooled to a phase change area, the temperature of an upper cooling bed is controlled to be 870-920 ℃, and the HRB400E performance is qualified, the strength is high, the ductility is good, the safety reserve capacity is large, the shock resistance is good, the high-strain low-cycle fatigue performance is realized, the anti-damage capability of an engineering structure is favorably improved, the production cost is effectively reduced, and social resources are saved by reducing the silicon content in steel.
Description
Technical Field
The invention belongs to the technical field of steel production, and relates to a production method of a low-silicon HRB400E steel bar.
Background
The HRB400E is a high-strength anti-seismic reinforcing steel bar and is widely applied to key projects such as bridges, buildings, ocean engineering and the like with high requirements on safety performance. HRB400E hot-rolled ribbed steel bar is the main material of reinforced concrete building structure, and bears various loads such as tensile stress, compressive stress and strain, high-cycle or low-cycle fatigue effect, high-temperature or cold-brittleness effect, physical or chemical corrosion, steel bar reprocessing effect (welding, mechanical connection, bending or straightening) and the like in the structure, so that the concrete can meet various functional requirements, and the application is wide.
At present, HRB400E grade is evolved from 20MnSiV, strengthening elements of manganese and silicon are generally adopted, high-silicon high-manganese production is adopted, and the chemical components are mainly as follows: 0.20-0.25%, si:0.40-0.70% of Mn;1.30-1.60 percent and proper V, and in recent years, because the price of the ferrosilicon rises and the production cost is higher, the development of a rolling and cooling control process is necessary, the production cost is reduced, and social resources are saved.
Disclosure of Invention
In view of this, the invention provides a method for producing a low-silicon HRB400E steel bar, in order to solve the problem of cost increase caused by adding silicon element to the HRB 400E.
In order to achieve the purpose, the invention provides the following technical scheme:
a low-silicon HRB400E steel bar comprises the following elements in percentage by weight: 0.20 to 0.25% by weight of C,0.10 to 0.30% by weight of Si,1.20 to 1.60% by weight of Mn,0.015 to 0.030% by weight of V,0.008 to 0.012% by weight of N, the balance being iron and inevitable impurity elements;
a production method of a low-silicon HRB400E steel bar comprises the following steps:
s1: heating a casting blank containing elements in a low-silicon HRB400E steel bar to 980-1150 ℃, wherein the temperature difference between the inside and the outside of the casting blank is less than or equal to 15 ℃;
s2: rolling the heated casting blank, reducing the initial rolling temperature to 950-1050 ℃, realizing recrystallization rolling by rough and medium rolling, and repeatedly rolling and recrystallizing a rolled piece to obtain a finished product;
s3: and (4) performing graded cooling on the finished product to quickly cool the rolled piece to a phase change area, and controlling the temperature of an upper cooling bed to be 870-920 ℃.
Further, the casting blank is detected and controlled by using the steel ladle slag, the pouring temperature of a tundish is 1522-1542 ℃, the single flow pulling speed of the casting blank is 2.5-3.2 m/min, and the pulling speed fluctuation is less than or equal to +/-0.05 m/min.
Further, the heating time of the casting blank is 90-120 minutes, an 18-frame hot continuous rolling unit is adopted, and the rolling specification is 16-32 mm.
Further, the cross section of the casting blank is a rectangle with the side length of 170 mm.
Furthermore, the diameter of the finished product material is 16-32 mm.
The invention has the beneficial effects that:
1: according to the production method of the low-silicon HRB400E steel bar, the silicon content in the steel is reduced, the controlled rolling and controlled cooling process is adopted, the HRB400E is ensured to be qualified in performance, the strength is high, the ductility is good, the yield strength reaches more than 450MPa, the maximum force total elongation reaches more than 10%, the performance is stable, the strain aging sensitivity is low, the safety reserve capacity is large, the shock resistance is good, the yield ratio is more than 1.25, the high-strain low-cycle fatigue performance is realized, the anti-damage capability of an engineering structure is favorably improved, the production cost is effectively reduced, social resources are saved, the Si content is reduced to 0.20% from 0.50%, and the cost per ton of steel can be saved by 45 yuan.
2: the production method of the low-silicon HRB400E steel bar has good welding performance, is suitable for various welding methods, and has a wide application range.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the examples provided in the following embodiments are only illustrative of the basic idea of the present invention, and features in the following embodiments and examples may be combined with each other without conflict.
Example 1
The embodiment provides a low-alloy HRB400E steel bar, which comprises the following elements in percentage by weight: c:0.23%, si:0.18%, mn:1.46%, V:0.022%, N:0.0091%, P:0.027%, S:0.023 percent and the balance of Fe.
The production method comprises the following steps:
s1: heating the casting blank containing the elements to 1024 ℃, wherein the temperature difference between the inside and the outside of the casting blank is 9 ℃; the cross section of the casting blank is a square with the side length of 170 mm.
S2: and rolling the heated casting blank into a finished product material with the diameter of 20mm, wherein the initial rolling temperature is 1016 ℃, and the final rolling temperature is 950 ℃.
S3: after rolling, the temperature of the rolled steel plate is 872 ℃ on a cooling bed through a closed-loop temperature control water cooling device.
The casting blank is detected and controlled by using steel ladle slag, the pouring temperature of a tundish is 1527 ℃, the uniflow casting speed of the casting blank is 2.8m/min, the fluctuation of the casting speed is less than or equal to +/-0.05 m/min, the heating time of the casting blank is 95 minutes, and an 18-frame hot continuous rolling unit is adopted.
Example 2
The embodiment provides a low-alloy HRB400E steel bar, which comprises the following elements in percentage by weight: c:0.24%, si:0.16%, mn:1.45%, V:0.018%, N:0.0091%, P:0.034%, S:0.028 percent and the balance of Fe.
The production method comprises the following steps:
s1: heating the casting blank containing the elements to 1018 ℃, wherein the temperature difference between the inside and the outside of the casting blank is 12 ℃; the cross section of the casting blank is a square with the side length of 170 mm.
S2: and rolling the heated casting blank into a finished product material with the diameter of 18mm, wherein the initial rolling temperature is 1007 ℃, and the final rolling temperature is 948 ℃.
S3: after rolling, the temperature of the rolled steel sheet is 892 ℃ through a closed-loop temperature control water cooling device.
The casting blank is detected and controlled by using the steel ladle slag, the pouring temperature of a tundish is 1530 ℃, the single flow pulling speed of the casting blank is 2.9m/min, the pulling speed fluctuation is less than or equal to +/-0.05 m/min, the heating time of the casting blank is 100 minutes, and an 18-frame hot continuous rolling unit is adopted.
Example 3
The embodiment provides a low-alloy HRB400E steel bar, which comprises the following elements in percentage by weight: c:0.24%, si:0.20%, mn:1.50%, V:0.025%, N:0.0098%, P:0.025%, S:0.032%, and the balance Fe.
The production method comprises the following steps:
s1: heating the casting blank containing the elements to 1030 ℃, wherein the temperature difference between the inside and the outside of the casting blank is 13 ℃; the cross section of the casting blank is a square with the side length of 170 mm;
s2: rolling the heated casting blank into a finished product material with the diameter of 25mm, wherein the initial rolling temperature is 1020 ℃, and the final rolling temperature is 938 ℃;
s3: after rolling, the temperature of the rolled steel sheet is 875 ℃ through a closed-loop temperature control water cooling device.
The casting blank is detected and controlled by using the steel ladle slag, the pouring temperature of a tundish is 1529 ℃, the single flow pulling speed of the casting blank is 2.4m/min, the pulling speed fluctuation is less than or equal to +/-0.05 m/min, the heating time of the casting blank is 90 minutes, and an 18-frame hot continuous rolling unit is adopted.
Example 4
The embodiment provides a low-alloy HRB400E steel bar, which comprises the following elements in percentage by weight: c:0.23%, si:0.20%, mn:1.48%, V:0.028%, N:0.0117%, P:0.029%, S:0.031%, and the balance Fe.
The production method comprises the following steps:
s1: heating the casting blank containing the elements to 1018 ℃, wherein the temperature difference between the inside and the outside of the casting blank is 11 ℃; the cross section of the casting blank is a square with the side length of 170 mm.
S2: rolling the heated casting blank into a finished product material with the diameter of 28mm, wherein the initial rolling temperature is 1025 ℃, and the final rolling temperature is 946 ℃;
s3: after rolling, the temperature of the rolled steel plate is controlled by a closed-loop temperature control water cooling device, and the temperature of the rolled steel plate is 877 ℃ on a cooling bed.
The casting blank is detected and controlled by steel ladle slag discharging, the pouring temperature of a tundish is 1542 ℃, the single flow pulling speed of the casting blank is 2.5m/min, the pulling speed fluctuation is less than or equal to +/-0.05 m/min, the heating time of the casting blank is 100 minutes, and an 18-frame hot continuous rolling unit is adopted.
Example 5
The embodiment provides a low-alloy HRB400E steel bar, which comprises the following elements in percentage by weight: c:0.22%, si:0.20%, mn:1.53%, V:0.030%, N:0.0114%, P:0.036%, S:0.038% and the balance Fe.
The production method comprises the following steps:
s1: heating the casting blank containing the elements to 1028 ℃, wherein the temperature difference between the inside and the outside of the casting blank is 13 ℃; the cross section of the casting blank is a square with the side length of 170 mm;
s2: rolling the heated casting blank into a finished product material with the diameter of 28mm at the initial rolling temperature of 1027 ℃ and the final rolling temperature of 949 ℃;
s3: after rolling, the temperature of the rolled steel sheet is 875 ℃ on a cooling bed through a closed-loop temperature control water cooling device.
The casting blank is detected and controlled by using the steel ladle slag, the pouring temperature of a tundish is 1522 ℃, the single flow pulling speed of the casting blank is 3.2m/min, the pulling speed fluctuation is less than or equal to +/-0.05 m/min, the heating time of the casting blank is 110 minutes, and an 18-frame hot continuous rolling unit is adopted.
The results of mechanical property examination of the HRB400E steel bars obtained in examples 1 to 5 are shown in table 1.
| Yield strength ReL, MPa | Tensile strength Rm, MPa | Ratio of yield to strength | Total extensionThe length rate of the film is Agt% | |
| Example 1 | 465 | 650 | 1.40 | 15.2 |
| Example 2 | 455 | 635 | 1.39 | 14.7 |
| Example 3 | 450 | 635 | 1.41 | 17.3 |
| Example 4 | 445 | 615 | 1.38 | 16.2 |
| Example 5 | 450 | 620 | 1.38 | 14.3 |
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (5)
1. The production method of the low-silicon HRB400E steel bar is characterized in that the low-silicon HRB400E steel bar comprises the following elements in percentage by weight: 0.20-0.25% by weight of C, 0.10-0.30% by weight of Si, 1.20-1.60% by weight of Mn, 0.015-0.030% by weight of V, 0.008-0.012% by weight of N, the remainder being iron and unavoidable impurity elements;
the production method of the low-silicon HRB400E steel bar comprises the following steps:
s1: heating a casting blank containing elements in a low-silicon HRB400E steel bar to 980-1150 ℃, wherein the inside and outside temperature difference of the casting blank is less than or equal to 15 ℃;
s2: rolling the heated casting blank, reducing the rolling start temperature to 950-1050 ℃, realizing recrystallization rolling by rough and medium rolling, and repeatedly rolling and recrystallizing a rolled piece to obtain a finished product;
s3: and the finished product material is cooled in a grading way to enable the rolled piece to be rapidly cooled to a phase change area, and the temperature of an upper cooling bed is controlled to be 870-920 ℃.
2. The method for producing the low-silicon HRB400E steel bar as claimed in claim 1, wherein the casting blank is controlled by ladle slag discharge detection, the pouring temperature of a tundish is 1522-1542 ℃, the single flow pulling speed of the casting blank is 2.5-3.2 m/min, and the fluctuation of the pulling speed is less than or equal to +/-0.05 m/min.
3. The method for producing the low-silicon HRB400E steel bar as claimed in claim 2, wherein the casting blank is heated for 90-120 minutes, and an 18-stand hot continuous rolling mill set is adopted, and the rolling specification is 16-32 mm.
4. The method of claim 1 wherein the slab has a cross-section that is rectangular with 170mm sides.
5. The method of claim 1 wherein the finished product has a diameter of 16-32 mm.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109355565A (en) * | 2018-11-16 | 2019-02-19 | 通化钢铁股份有限公司 | A kind of Nb-microalloying HRB400E hot rolling anti-seismic steel bar and its production method |
| CN111020392A (en) * | 2019-12-16 | 2020-04-17 | 河钢股份有限公司承德分公司 | Production method of low-alloy HRB400E steel bar |
| CN111455261A (en) * | 2020-01-11 | 2020-07-28 | 武钢集团昆明钢铁股份有限公司 | Nitrogen-rich vanadium microalloyed large-specification 400MPa high-strength-toughness anti-seismic steel bar and preparation method thereof |
| CN113736972A (en) * | 2020-05-27 | 2021-12-03 | 山西通才工贸有限公司 | Controlled rolling and controlled cooling production process of niobium-containing microalloyed HRB400E steel bar |
| CN113981311A (en) * | 2021-09-29 | 2022-01-28 | 武钢集团昆明钢铁股份有限公司 | Nitrogen-rich microalloy fine-grain HRB400E straight-bar anti-seismic steel bar and preparation method thereof |
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- 2022-09-07 CN CN202211088647.5A patent/CN115948691A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109355565A (en) * | 2018-11-16 | 2019-02-19 | 通化钢铁股份有限公司 | A kind of Nb-microalloying HRB400E hot rolling anti-seismic steel bar and its production method |
| CN111020392A (en) * | 2019-12-16 | 2020-04-17 | 河钢股份有限公司承德分公司 | Production method of low-alloy HRB400E steel bar |
| CN111455261A (en) * | 2020-01-11 | 2020-07-28 | 武钢集团昆明钢铁股份有限公司 | Nitrogen-rich vanadium microalloyed large-specification 400MPa high-strength-toughness anti-seismic steel bar and preparation method thereof |
| CN113736972A (en) * | 2020-05-27 | 2021-12-03 | 山西通才工贸有限公司 | Controlled rolling and controlled cooling production process of niobium-containing microalloyed HRB400E steel bar |
| CN113981311A (en) * | 2021-09-29 | 2022-01-28 | 武钢集团昆明钢铁股份有限公司 | Nitrogen-rich microalloy fine-grain HRB400E straight-bar anti-seismic steel bar and preparation method thereof |
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