CN116689479B - Technological method for producing vanadium-free low-silicon hot rolled ribbed steel bars - Google Patents
Technological method for producing vanadium-free low-silicon hot rolled ribbed steel bars Download PDFInfo
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- CN116689479B CN116689479B CN202310986319.5A CN202310986319A CN116689479B CN 116689479 B CN116689479 B CN 116689479B CN 202310986319 A CN202310986319 A CN 202310986319A CN 116689479 B CN116689479 B CN 116689479B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 51
- 239000010959 steel Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 12
- 239000010703 silicon Substances 0.000 title claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000009987 spinning Methods 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 7
- 229910000805 Pig iron Inorganic materials 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000011572 manganese Substances 0.000 claims description 2
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 229910000976 Electrical steel Inorganic materials 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910006639 Si—Mn Inorganic materials 0.000 description 1
- 229910000756 V alloy Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices 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
- B21B45/0203—Cooling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a process method for producing vanadium-free low-silicon hot rolled ribbed steel bars, which relates to the field of alloy production and comprises the following steps of feeding vanadium-free low-silicon steel billets into a step heating furnace for three-section heating of a preheating section, a heating section and a soaking section; rough rolling, intermediate rolling, pre-finish rolling, finish rolling one and finish rolling two are performed on the steel billet, and spinning is performed to form coiled steel bars; after rolling, the scattered coil after spinning is cooled by a stelmor air-cooled line provided with a Jialing device, so that the yield strength of the head, middle and tail positions of the coiled steel bar is greater than 407Mpa, the average yield strength is greater than 419Mpa, the minimum value of the total elongation under the maximum force is 10.8%, the total elongation under the average maximum force is greater than 13.7%, and the same circle difference is less than 35Mpa.
Description
Technical Field
The invention relates to the technical field of alloy production, in particular to a process method for producing vanadium-free low-silicon hot rolled ribbed steel bars.
Background
The wire is one of important building steel, and at present, in the economic development period of China, a large number of spiral steel bars are still needed for urban construction and resident living conditions solving, and the wire occupies a particularly important position in national economy.
With the increase of the requirement on the mass of the building, the national requirements on the comprehensive performance of the reinforced bar are higher, and GB/T1499.2-2018, section 2 of reinforced concrete steel, is proposed in 2018: the hot rolled ribbed steel bar is increased by adding a grade of 600Mpa steel bar and a grade of anti-seismic steel bar, which is enough to prove that the quality evaluation standard of the steel bar in China is more strict. Although the addition of V alloy can effectively improve the comprehensive mechanical properties, the problems are obvious. On one hand, the production cost of steel factories is directly increased due to high production cost of V resources in upstream China, thereby weakening the enthusiasm of steel bar production and being not beneficial to the construction of infrastructure in China; on the other hand, an increase in the V content causes excessive grain refinement, making the yield ratio unacceptable.
Accordingly, in view of the above shortcomings, there is a need to provide a process for producing vanadium-free low-silicon hot rolled ribbed bars.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the problems of high production cost and unstable performance of the hot rolled ribbed coiled steel bar with the specification of 8 mm.
(II) technical scheme
In order to solve the technical problems, the invention provides a process method for producing vanadium-free low-silicon hot rolled ribbed steel bars, which comprises the following steps:
i, feeding a vanadium-free low-silicon billet into a step heating furnace to perform three-stage heating of a preheating section, a heating section and a soaking section;
II, rough rolling, intermediate rolling, pre-finish rolling, finish rolling one and finish rolling two, and spinning the steel billet to form coiled steel bars;
and III, after rolling, cooling the loose coil by using a stelmor air cooling line provided with a Jialing device, so that the yield strength of the head, middle and tail positions of the coiled steel bar is more than 407Mpa, the average yield strength is more than 419Mpa, the minimum value of the total elongation under the maximum force is 10.8%, the total elongation under the average maximum force is more than 13.7%, and the same circle difference is less than 35Mpa.
As for the present inventionPreferably, the billet is formed by mixing one or more of molten iron, scrap steel and pig iron, slagging by an oxygen top-blown converter, and adding a Si-Mn alloy, and the individual billet has a cross-sectional dimension of 150×150mm 2 。
As a further explanation of the present invention, it is preferable that the mass fraction of each component in the steel slab is C:0.22 to 0.25 percent of Si:0.3 to 0.4 percent of Mn:1.23 to 1.30 percent, P is less than 0.04 percent, S is less than 0.04 percent, and the balance is Fe.
As a further explanation of the present invention, it is preferable that the pre-finish rolling temperature is 1020.+ -. 20 ℃, the temperature of the finish rolling feed is 860.+ -. 15 ℃, the temperature of the finish rolling feed is 870.+ -. 15 ℃ and the spinning temperature is 900 to 930 ℃.
As a further explanation of the present invention, it is preferable that the finish rolling speed is controlled at 89m/s.
As a further illustration of the present invention, preferably, the fan 1 is 90%, the fan 2 is 85%, the fan 3 is 70%, and the fan 4 is 70%; 50% of the 1# fan jialing device, 70% of the 2# fan jialing device, 70% of the 3# fan jialing device and 65% of the 4# fan jialing device.
(III) beneficial effects
The technical scheme of the invention has the following advantages:
the invention ensures that the yield strength of the head, middle and tail positions of the coiled steel bar completely meets the requirements by improving the production process, reduces the size of the head removing section, reduces the steel loss and improves the yield.
Drawings
Fig. 1 is a microstructure view of 200 times the head position of the coiled steel reinforcement of the present invention;
FIG. 2 is a microstructure view of the present invention at 200 times the middle position of the coiled steel bar;
fig. 3 is a microstructure view of 200 times the tail position of the coiled steel reinforcement of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A process method for producing vanadium-free low-silicon hot rolled ribbed steel bars comprises the following steps:
and I, conveying the steel billet to a step heating furnace for heating. The billet is produced by adding one or more raw materials of molten iron, scrap steel and pig iron into a converter, combining with an oxygen top-blown converter for slagging, adding silicon-manganese alloy and the like after converting steel, and finally producing the billet through a continuous casting process flow of a steel mill. Wherein the mass fractions of each element in the steel billet are respectively as follows: c:0.22 to 0.25 percent, si:0.3 to 0.4 percent, mn:1.23 to 1.30 percent, P is lower than 0.04 percent, S is lower than 0.04 percent, and the balance is Fe. The cross-sectional dimension of the billet is preferably 150X 150mm 2 。
The walking beam type heating furnace is suitable for blanks with a section of more than 120 multiplied by 120mm 2 The billet is placed on a movable hearth at the lowest position, the movable hearth lifts the billet, then the movable hearth descends to place the billet on a fixed hearth, and finally the movable hearth returns to the original position. The steel billet is continuously heated in the walking beam type heating furnace through the preheating section, the heating section and the soaking section, so that austenitization can be realized, irreversible growth of austenite grains caused by overheating or overburning of the steel billet can be avoided, and the comprehensive mechanical property of the coiled steel bar is effectively ensured.
And II, after the billet is conveyed out of the step heating furnace, dephosphorizing the billet by adopting a high-pressure water gun, and then entering a rolling process, wherein the rolling process is divided into rough rolling, medium rolling, pre-finish rolling, finish rolling I, finish rolling II and wire-laying processes, the initial rolling temperature is 900-980 ℃ (direct rolling is 900-940 ℃, cold billet is supplied at 940-980 ℃), the billet is firstly subjected to rough rolling, then the pre-finish rolling temperature is 1020+/-20 ℃ by adjusting the water penetrating quantity and water pressure, the finish rolling I temperature is 860+/-15 ℃, the finish rolling II temperature is 870+/-15 ℃, the finish rolling speed is 89m/s, and the wire-laying temperature reaches 900-930 ℃.
And III, after rolling and spinning, the loose coil falls on a moving conveying chain to pass through a standard Steyr air cooling line, the upper part of the loose coil conveyor is opened, and the loose coil is cooled by air blast of a lower air chamber. The opening degree of the first four fans is 90% of that of the 1# fan, 85% of that of the 2# fan, 70% of that of the 3# fan, 70% of that of the 4# fan, and 50%, 70%, 65% of that of the 1# to 4# fans, and the air quantity distribution at the two sides and the middle of the coil can be regulated according to different thickness and density piled up at the two sides and the middle of the coil, so that uniform cooling effect is obtained, the same circle difference is reduced, and the performance of the reinforcing steel bar is stabilized. Wherein 50% of the marks represent the same air quantity distributed to the middle position and the side position, and 100% of the marks represent the whole air quantity distributed to the middle position of the spiral shell. Finally, naturally cooling and collecting the coils to obtain the hot rolled ribbed coiled steel bars with the specifications of HRB400E8 mm.
In order to verify that the process method can meet the expected requirement, a furnace of steel bars are produced at present, and a group of spiral steel bars produced by the process method are taken for comprehensive performance comparison. The comprehensive properties include microstructure and comprehensive mechanical properties. The comprehensive mechanical properties are shown in tables 1 to 4:
through analysis of the data, the average tensile strength of the head, middle and tail positions of the hot rolled ribbed steel bar produced through the novel process is 641 Mpa, 642 Mpa and 644Mpa respectively, the average yield strength (Rp 0.2) is greater than 407Mpa, the average yield strength is 419Mpa, 445Mpa and 445Mpa respectively, the minimum value of the total elongation (Agt) under the maximum force is 10.8%, the average total elongation Agt under the maximum force is 13.7%, 14.96% and 14.05%, the same circle difference is 18.2Mpa, 34.1Mpa and 31.1Mpa respectively, the difference between the performances of the lap joint position and the non-lap joint position is smaller, and the stability of the performance of the steel bar is ensured. All test samples completely meet the national standard requirements.
In summary, compared with the prior art, the invention ensures that the yield strength of the head, middle and tail positions of the steel bar completely meets the requirements through the adjustment of the process, reduces the size of the head removing section, reduces the steel loss and improves the yield. In addition, the production cost of each ton of HRB400E8mm hot rolled ribbed coiled steel bar is reduced by 9 to 17 yuan, and according to 100 ten thousand tons of annual output, at least 1300 ten thousand yuan is saved each year, so that the production cost is greatly reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. A process method for producing vanadium-free low-silicon hot rolled ribbed steel bars is characterized by comprising the following steps: comprises the following steps of;
and I, mixing the following components in percentage by mass: 0.22 to 0.25 percent of Si:0.3 to 0.4 percent of Mn:1.23 to 1.30 percent of billet with P lower than 0.04 percent, S lower than 0.04 percent and the balance of Fe is fed into a step heating furnace to be heated in three stages of a preheating stage, a heating stage and a soaking stage;
II, rough rolling, intermediate rolling, pre-finish rolling, finish rolling one and finish rolling two, and spinning the steel billet to form coiled steel bars; wherein the pre-finish rolling temperature is 1020+/-20 ℃, the temperature of the finish rolling inlet I is 860+/-15 ℃, the temperature of the finish rolling inlet II is 870+/-15 ℃, and the spinning temperature is 900-930 ℃; the finish rolling speed is controlled at 89m/s;
thirdly, after rolling, cooling the loose coil by a stelmor air cooling line provided with a Jialing device, wherein a No. 1 fan is opened by 90%, a No. 2 fan is opened by 85%, a No. 3 fan is opened by 70% and a No. 4 fan is opened by 70%; 50% of the 1# fan jialin device, 70% of the 2# fan jialin device, 70% of the 3# fan jialin device and 65% of the 4# fan jialin device; so that the yield strength of the head, middle and tail positions of the coiled steel bar is greater than 407Mpa, the average yield strength is greater than 419Mpa, the minimum value of the total elongation under the maximum force is 10.8%, the total elongation under the average maximum force is greater than 13.7%, and the same circle difference is less than 35Mpa.
2. The process for producing vanadium-free low-silicon hot rolled ribbed steel bar according to claim 1, characterized in that: the billet is formed by mixing one or more of molten iron, scrap steel and pig iron, slagging by an oxygen top-blown converter and adding silicon-manganese alloy, and the section size of a single billet is 150 multiplied by 150mm 2 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310986319.5A CN116689479B (en) | 2023-08-08 | 2023-08-08 | Technological method for producing vanadium-free low-silicon hot rolled ribbed steel bars |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310986319.5A CN116689479B (en) | 2023-08-08 | 2023-08-08 | Technological method for producing vanadium-free low-silicon hot rolled ribbed steel bars |
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| Publication Number | Publication Date |
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| CN116689479A CN116689479A (en) | 2023-09-05 |
| CN116689479B true CN116689479B (en) | 2023-12-26 |
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| CN202310986319.5A Active CN116689479B (en) | 2023-08-08 | 2023-08-08 | Technological method for producing vanadium-free low-silicon hot rolled ribbed steel bars |
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| Publication number | Publication date |
|---|---|
| CN116689479A (en) | 2023-09-05 |
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