CN115725898A - Low-cost high-speed bar deformed steel bar with surface iron scale thickness of more than 10 mu m - Google Patents
Low-cost high-speed bar deformed steel bar with surface iron scale thickness of more than 10 mu m Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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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- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
The invention provides a high-speed bar deformed steel bar with low cost and a surface oxidized iron sheet thickness of more than 10 mu m, which comprises the following chemical components in percentage by weight: c:0.20 to 0.25Wt%, si: less than or equal to 0.35Wt%, mn: 0.8-1.1 Wt%, P: less than or equal to 0.045Wt%, S: less than or equal to 0.045Wt%, nb: 0.015-0.035 Wt%, N: less than or equal to 0.009Wt%; the rest is iron and inevitable impurities, the thickness of the iron scale on the surface of the steel bar produced by double-line two-segmentation is increased to 10 mu m or more, and the thickness of the iron scale on the surface of the steel bar produced by single line is increased to 12 mu m or more.
Description
The invention is the application number: 2021105928685, filing date: 2021, 5 month, 28 days, invention title: the production method of the high-speed bar screw steel with low cost and the surface oxidized iron sheet thickness of more than 10 mu m is applied by divisional application.
Technical Field
The invention relates to the field of metallurgy, in particular to high-speed bar deformed steel with low cost and surface iron oxide scale thickness of more than 10 mu m.
Background
At present, the overall dimension of the steel bar produced by a high-speed bar is well controlled, the finish rolling speed can reach 45 m/s or more, and the steel bar has the advantages of high yield, high quality and low cost, and is the development trend of the production of the current medium and small-sized threaded steel bar. The single-wire and two-wire high-speed bars are braked by using a brake roller before being loaded on a cooling bed after finish rolling, and when the temperature of the steel bar on the cooling bed is too high, the steel bar is easily pressed to be deformed by the brake roller if the clamping force is too large, and the appearance size of the steel bar exceeds the national standard; if the clamping force is too small, the braking effect is not sufficient. Therefore, the domestic high-speed bar production line often uses a controlled rolling and controlled cooling process and a cooling bed at a lower temperature, the strength of the steel bar is improved to resist the braking pressure, the braking effect is achieved, and meanwhile, the alloy consumption and the production cost are reduced. But the lower temperature of the upper cooling bed causes the iron scale of the steel bar produced by the high-speed bar production line to be thinner (usually less than or equal to 7 mu m), and the rust-proof capability of the steel bar is weakened when the thickness of the iron scale is thinner, thereby affecting the appearance and the sale of the product.
In summary, the following problems exist in the prior art: how to improve the thickness of the iron scale and enhance the rust-proof capability of the steel bar.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is how to improve the thickness of the iron scale and enhance the rust prevention capability of the steel bar.
To this end, in one aspect, an embodiment of the present invention provides a method for producing a high-speed bar-material screw-thread steel with a low cost and a surface scale thickness of 10 μm or more, where the method for producing a high-speed bar-material screw-thread steel with a low cost and a surface scale thickness of 10 μm or more includes:
the method comprises the following steps of smelting blast furnace molten iron, desulfurizing and pretreating the molten iron, smelting converter molten steel, blowing argon, LF refining, continuous casting of square billets, heating by a heating furnace, rough rolling, intermediate rolling, pre-finish rolling, controlled cooling and recovery, finish rolling, controlled cooling and recovery after rolling;
the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.20 to 0.25Wt%, si: less than or equal to 0.35Wt%, mn: 0.8-1.1 Wt%, P: less than or equal to 0.045Wt%, S: less than or equal to 0.045Wt%, nb: 0.015-0.035 Wt%, N: less than or equal to 0.009Wt%;
a heat preservation device is used on the cooling bed, and the storage mode of the cooling bed steel bars is changed from one tooth to a plurality of teeth, so that the heat dissipation is slowed down, and the retention time of the high-temperature area of the steel bars on the cooling bed is prolonged;
the deformation of the last two machine frame passes is more than 17 percent.
Specifically, the high-speed bar deformed steel bar is HRB400E straight deformed steel bar.
Specifically, the heating time of the billet is 60-90 minutes, and the initial rolling temperature is 1000-1040 ℃.
Specifically, the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.20Wt%, si:0.26Wt%, mn:0.92Wt%, P:0.033Wt%, S:0.026Wt%, nb:0.020Wt%, N: less than or equal to 0.0045Wt percent.
Specifically, the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.23Wt%, si:0.31Wt%, mn:0.95Wt%, P:0.028Wt%, S:0.027Wt%, nb:0.016Wt%, N: less than or equal to 0.0069Wt percent.
Specifically, the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.22Wt%, si:0.30Wt%, mn:1.00Wt%, P:0.030Wt%, S:0.032Wt%, nb:0.021Wt%, N: less than or equal to 0.0052Wt%.
Specifically, the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.25Wt%, si:0.29Wt%, mn:0.90Wt%, P:0.029Wt%, S:0.031Wt%, nb:0.028Wt%, N: less than or equal to 0.0078Wt%.
Specifically, the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.24Wt%, si:0.33Wt%, mn:0.96Wt%, P:0.031Wt%, S:0.028Wt%, nb:0.030Wt%, N: less than or equal to 0.0048Wt percent.
On the other hand, the embodiment of the invention also provides a high-speed bar deformed steel bar with low cost and the surface oxide scale thickness of more than 10 micrometers, and a production method of the high-speed bar deformed steel bar with low cost and the surface oxide scale thickness of more than 10 micrometers is adopted, wherein the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.20 to 0.25Wt%, si: less than or equal to 0.35Wt%, mn: 0.8-1.1 Wt%, P: less than or equal to 0.045Wt%, S: less than or equal to 0.045Wt%, nb: 0.015-0.035 Wt%, N: less than or equal to 0.009Wt%.
Specifically, the high-speed bar deformed steel bar is HRB400E straight deformed steel bar.
The production method of the high-speed bar deformed steel bar with low cost and the surface iron scale thickness of more than 10 mu m reduces the production cost, and compared with the HRB400E steel bar of a conventional production line, the production method has the advantages that the addition of the silicon-manganese alloy is reduced, and the production cost is reduced. Meanwhile, the austenite recrystallization temperature is increased, non-recrystallization rolling at a higher temperature is realized, the effect of precipitation strengthening is achieved, the strength is improved, and the thickness of the iron scale is increased; the thickness of the iron scale on the surface of the steel bar is increased to more than 10 mu m while keeping high yield and high finishing rolling speed of the high-speed bar, the surface quality is good and the mechanical property is qualified.
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
The invention provides a production method of high-speed bar deformed steel bar with low cost and surface oxide scale thickness of more than 10 mu m, which comprises the following steps:
the production process of the single-wire high-speed bar steel bar comprises the following steps: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, argon blowing, square billet continuous casting, heating by a heating furnace, rough rolling (6 frames), medium rolling (6 frames), pre-finish rolling (6 frames), single line, controlled cooling and recovery section, finish rolling (4 frames), finish rolling (diameter shearing 2 frames), controlled cooling and recovery section after rolling, pinch rolls, disc double-length shear, braking device, hub device, cooling bed cooling, fixed-length shear, inspection, packaging and warehousing
The production process of the double-line high-speed bar steel bar comprises the following steps: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, argon blowing, square billet continuous casting, heating by a heating furnace, rough rolling (6 frames), medium rolling (6 frames), pre-finish rolling (6 frames) and splitting into two lines, a controlled cooling and recovery section multiplied by 2, finish rolling (4 frames) multiplied by 2, a shearing diameter of 2 frames multiplied by 2, a controlled cooling and recovery section multiplied by 2 after rolling, a pinch roll multiplied by 2, a disc double-length shear multiplied by 2, a braking device multiplied by 2, a hub device multiplied by 2, cooling bed cooling, fixed-length shearing, inspection, packaging and warehousing, converter molten steel smelting: the S of the charged molten iron is required to be less than or equal to 0.050Wt%; argon is blown from the bottom in the whole process of smelting, the gas flow is increased in the later stage of blowing, and the stirring of a molten pool is enhanced; the end point of the converter is controlled to be less than or equal to 0.15Wt% C and less than or equal to 0.037Wt% P.
And (3) square billet continuous casting, wherein ladle slag discharging detection control is adopted, the pouring temperature of a tundish is 1520-1540 ℃, the tundish uses a common covering agent and common square billet covering slag, and the single flow pulling speed of a casting blank is 3.0-4.0 m/min.
The components adopt low Si, the surface does not become red and the iron scale is good; low Mn, no Si iron is added, and only Mn brought by the Si-Mn alloy is added; nb is added to increase the austenite recrystallization temperature so as to provide a foundation for realizing controlled rolling; and controlling the N element in the steel in a reasonable interval, so that most of N is combined with Nb to reduce free N in the steel.
1. The components:
(1) Low Si: silicon contained in the silicon-killed steel can form pits in an iron scale layer and expand silicates in the iron scale layer, so that the adhesion of the oxide scale to the steel is increased, and the iron scale of a final product is in red, black or red-black alternate distribution. Therefore, the low Si is controlled during the component design, only the silicomanganese alloy is added for deoxidation alloying during the converter alloying, and the Si in the steel is kept at a lower level without adding the Si-Fe deoxidation alloying, thereby being beneficial to the production of iron scale and reducing the cost.
(2) Low Mn: mn has a solid solution strengthening effect and improves the hardenability of the steel to enable the CCT curve to move to the right, mn is controlled at a lower level to reduce the cost and stably control the hardenability of the steel, and the lost strength is compensated by fine crystal strengthening at a lower temperature.
(3) Adding Nb to raise austenite recrystallization temperature, implementing unrecrystallized rolling at higher temperature and having precipitation strengthening effect, raising strength and increasing iron scale thickness. Nb is low in small specifications and high in large specifications.
(4) The N element in the steel is controlled in a reasonable interval, and the N and the Nb are combined to produce a compound, so that the precipitation strengthening effect is achieved. Meanwhile, the phenomenon that the solid solution form N in the steel is too high is avoided, the nitrogen in the solid solution form is a strong austenite forming and stabilizing element, the effect is about 20 times that of nickel, the nitrogen increases the stability of austenite, so that the normal transformation from austenite to a ferrite plus pearlite structure is incomplete under a certain cooling speed, and a part of the austenite is transformed into granular bainite, so that the formation of a bainite structure in the steel is promoted, and the plasticity of the steel is not stable. The upper limit of N control in the steel with the small specification and the lower limit of N control in the steel with the cooling speed of the cooling bed is slightly lower, and the upper limit of N control in the steel with the large specification and the lower limit of N control in the steel with the cooling speed of the cooling bed is slightly higher.
(5) The control method of N is as follows: the nitrogen content and the oxygen content at the converter end point are in a certain proportional relation, the oxygen content at the converter end point or oxygen element [ O ] is controlled to be less than or equal to 0.09%, and argon is used as converter bottom blowing gas; argon is used for bottom blowing of an argon steel ladle, a ladle covering agent is added before argon blowing, the fact that the molten steel is exposed and absorbs N is avoided, and the exposed area of the surface of the molten steel of the steel ladle is controlled to be smaller than 40cm x 40cm (the argon is inert gas, the solubility of the argon in the molten steel is almost zero and does not chemically react with other elements in the steel); in the continuous casting process, a ladle long nozzle is used for protecting pouring, argon is blown for protecting (the flow of argon is more than 20L/min), and a sealing gasket is used for controlling nitrogen increase in steel.
TABLE 1 HRB400E ingredients (wt%)
2. Arranging a rolling line: 6 rough rolling frames, 6 middle rolling frames, 6 pre-finish rolling frames, a controlled cooling device, a recovery section, 4 finishing mill groups, a controlled cooling device, a recovery section and 2 reducing mills.
6 stands of short stress line rolling mill of roughing mill group, 6 stands of short stress line rolling mill of medium rolling, 6 stands of short stress line rolling mill of pre-finish rolling (all stands are connected by loop, the bar is cut twice from the 4 th stand and enters two channels at the outlet of pre-finish rolling respectively)
The finishing mill group is divided into two lines and adopts 4 top traffic cantilevers (V type) of 45 degrees to have no turning round super heavy load type Morgan rolling mill, totally 2 groups of modules, and every group of modules is driven alone by a motor, compares the collective transmission, has following advantage: each group of rollers can be independently regulated, the speed regulation range is wide, and the speed regulation flexibility is high; each motor has small power and small size; is convenient for maintenance and repair.
The reducing unit adopts 2 frames of 45-degree top-cross cantilever reducing machines for independent transmission. The addition of the reducing unit can realize rolling below the recrystallization temperature or in a dual-phase region (namely rolling by a heating machine), and the aims of refining grains and improving the performance of steel are fulfilled by designing a deformation system of the last two passes to crush the grains and inducing ferrite phase change by deformation. In addition, the production rate of the rolling mill can be improved, the dimensional tolerance and the surface quality of products can be improved, the variety and the specification can be increased, the metallurgical performance of the products can be improved, and the like.
The heat preservation device is used on the cooling bed, and the storage mode of the cooling bed steel bars is changed from one tooth to a plurality of teeth, so that the heat dissipation is slowed down, and the retention time of the high-temperature area of the steel bars on the cooling bed is prolonged;
the deformation of the last two machine frame passes is more than 17 percent.
The high-speed bar deformed steel bar is HRB400E straight deformed steel bar.
The heating time of the billet is 60 to 90 minutes, and the initial rolling temperature is 1000 to 1040 ℃.
3. The rolling process comprises the following steps:
(1) The heating time of the billet is 60-90 minutes, and the initial rolling temperature is as follows: 1020 +/-30 ℃.
(2) Double-line and single-line rolling with phi 10-phi 18mm specifications: the temperature of finish rolling and the temperature of the reducing mill are controlled, the austenite recrystallization temperature is increased by Nb, the non-recrystallization rolling of austenite can be realized at higher temperature, cooling control equipment cannot be installed behind the reducing mill, the formation of the scale is facilitated, and the temperature of the reducing mill can be slightly higher due to large deformation during single-line rolling, so that the generation of the scale is more facilitated.
(3) Double-line and single-line rolling with phi 20-phi 25 specifications: the finish rolling unit is not used, the water tank after pre-finish rolling and finish rolling is used by utilizing the concept of graded cooling control, the water tank is kept in a long-open state, the problem that the intensity of primary cooling is overlarge, and the control of organization and iron scale is not facilitated is avoided, and the temperature of the reducing mill can be slightly higher due to the large deformation amount during single-line rolling, so that the generation of the iron scale is more facilitated. After the reducing mill, no cooling control equipment is installed or used before the upper cooling bed, so that the steel bar is in a natural cooling state, and the surface of the steel bar obtains higher temperature of the upper cooling bed.
(4) And the pass deformation of the last two frames (K1 and K2) is more than 17 percent.
TABLE 2 Rolling Key temperature (wt%)
(5) The heat preservation device is used on the cooling bed, and the storage mode of the cooling bed steel bars is changed from one tooth to a plurality of teeth, so that the heat dissipation is slowed down, and the retention time of the high-temperature area of the steel bars on the cooling bed is prolonged.
The measures can improve the thickness of the iron scale on the surface of the steel bar produced by double-line two-segmentation to 10 mu m or more and the thickness of the iron scale on the surface of the steel bar produced by single line to 12 mu m or more when the final rolling speed of a high-speed bar production line is 30-45 m/s, and the mechanical property is qualified.
The high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.20Wt%, si:0.26Wt%, mn:0.92Wt%, P:0.033Wt%, S:0.026Wt%, nb:0.020Wt%, N: less than or equal to 0.0045Wt percent.
The high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.23Wt%, si:0.31Wt%, mn:0.95Wt%, P:0.028Wt%, S:0.027Wt%, nb:0.016Wt%, N: less than or equal to 0.0069Wt percent.
The high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.22Wt%, si:0.30Wt%, mn:1.00Wt%, P:0.030Wt%, S:0.032Wt%, nb:0.021Wt%, N: less than or equal to 0.0052Wt%.
The high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.25Wt%, si:0.29Wt%, mn:0.90Wt%, P:0.029Wt%, S:0.031Wt%, nb:0.028Wt%, N: less than or equal to 0.0078Wt%.
The high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.24Wt%, si:0.33Wt%, mn:0.96Wt%, P:0.031Wt%, S:0.028Wt%, nb:0.030Wt%, N: less than or equal to 0.0048Wt percent.
The invention also provides a high-speed bar deformed steel bar with low cost and the surface oxide scale thickness of more than 10 mu m, and a production method of the high-speed bar deformed steel bar with low cost and the surface oxide scale thickness of more than 10 mu m is adopted, and the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.20 to 0.25Wt%, si: less than or equal to 0.35Wt%, mn:0.8 to 1.1Wt%, P: less than or equal to 0.045Wt%, S: less than or equal to 0.045Wt%, nb: 0.015-0.035 Wt%, N: less than or equal to 0.009Wt%
Specifically, the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.20Wt%, si:0.26Wt%, mn:0.92Wt%, P:0.033Wt%, S:0.026Wt%, nb:0.020Wt%, N: less than or equal to 0.0045Wt percent.
Specifically, the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.23Wt%, si:0.31Wt%, mn:0.95Wt%, P:0.028Wt%, S:0.027Wt%, nb:0.016Wt%, N: less than or equal to 0.0069Wt percent.
Specifically, the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.22Wt%, si:0.30Wt%, mn:1.00Wt%, P:0.030Wt%, S:0.032Wt%, nb:0.021Wt%, N: less than or equal to 0.0052Wt%.
Specifically, the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.25Wt%, si:0.29Wt%, mn:0.90Wt%, P:0.029Wt%, S:0.031Wt%, nb:0.028Wt%, N: less than or equal to 0.0078Wt%.
Specifically, the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.24Wt%, si:0.33Wt%, mn:0.96Wt%, P:0.031Wt%, S:0.028Wt%, nb:0.030Wt%, N: less than or equal to 0.0048Wt percent.
The high-speed bar deformed steel bar is HRB400E straight deformed steel bar. Compared with the HRB400E steel bar of the conventional production line, the addition of the silicon-manganese alloy is reduced, and the production cost is reduced. The thickness of the iron scale on the surface of the steel bar is increased to more than 10 mu m while keeping high yield and high finishing rolling speed of the high-speed bar, the surface quality is good, and the mechanical property is qualified.
The production method of the high-speed bar deformed steel bar with low cost and the surface iron scale thickness of more than 10 mu m reduces the production cost, and compared with the HRB400E steel bar of the conventional production line, the addition of the silicon-manganese alloy is reduced, and the production cost is reduced. Meanwhile, the austenite recrystallization temperature is increased, non-recrystallization rolling at a higher temperature is realized, the effect of precipitation strengthening is achieved, the strength is improved, and the thickness of the iron scale is increased; the thickness of the iron scale on the surface of the steel bar is increased to more than 10 mu m while keeping high yield and high finishing rolling speed of the high-speed bar, the surface quality is good and the mechanical property is qualified.
Example (b):
1. the process for producing phi 10-25 mm straight twisted steel bars by using double-line high-speed bars comprises the following steps: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, argon blowing, square billet continuous casting, heating by a heating furnace, rough rolling (6 frames), medium rolling (6 frames), pre-finish rolling (6 frames) and splitting into double lines, a controlled cooling and recovery section multiplied by 2, finish rolling (4 frames) multiplied by 2, a shearing diameter of 2 frames multiplied by 2, a controlled cooling and recovery section multiplied by 2 after rolling, a pinch roll multiplied by 2, a disc double-length shear multiplied by 2, a braking device multiplied by 2, a rotating hub device multiplied by 2, cooling bed cooling, fixed-length shearing, inspecting, packaging and warehousing.
2. The heating time of the billet is 60 to 90 minutes, and the initial rolling temperature is 1000 to 1040 ℃.
3. The following components are mixed and prepared in a specific process. Wherein, table 3 is the composition (in weight percent) of the steels of the respective examples. Table 4 shows the production specifications, process parameters, mechanical properties, scale thickness corresponding to the example steels described in table 3.
Table 3: chemical composition (wt%) of product
| Examples of the invention | C | Si | Mn | P | S | Nb | N |
| Example 1 | 0.20 | 0.26 | 0.92 | 0.033 | 0.026 | 0.020 | ≤0.0045 |
| Example 2 | 0.23 | 0.31 | 0.95 | 0.028 | 0.027 | 0.016 | ≤0.0069 |
| Example 3 | 0.22 | 0.30 | 1.00 | 0.030 | 0.032 | 0.021 | ≤0.0052 |
| Example 4 | 0.25 | 0.29 | 0.90 | 0.029 | 0.031 | 0.028 | ≤0.0078 |
| Example 5 | 0.24 | 0.33 | 0.96 | 0.031 | 0.028 | 0.030 | ≤0.0048 |
Table 4: specific process parameters and mechanical properties of the examples
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it should be apparent to one skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A high-speed bar screw steel with low cost and the surface oxidized iron sheet thickness of more than 10 mu m, which is characterized in that,
the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.20 to 0.25Wt%, si: less than or equal to 0.35Wt%, mn:0.8 to 1.1Wt%, P: less than or equal to 0.045Wt%, S: less than or equal to 0.045Wt%, nb: 0.015-0.035 Wt%, N: less than or equal to 0.009Wt%; the balance of iron and inevitable impurities;
the production method of the high-speed bar deformed steel bar comprises the following steps:
a heat preservation device is used on the cooling bed, and the storage mode of the cooling bed steel bars is changed from one tooth to a plurality of teeth, so that the heat dissipation is slowed down, and the retention time of the high-temperature area of the steel bars on the cooling bed is prolonged;
the pass deformation of the last two frames is more than 17 percent;
the above measures improve the thickness of the iron scale on the surface of the steel bar produced by double-line two-segmentation to 10 mu m or more and the thickness of the iron scale on the surface of the steel bar produced by single-line production to 12 mu m or more when the final rolling speed of a high-speed bar production line is 30-45 m/s, and the mechanical property is qualified;
the finish rolling temperature is as follows: phi 10-phi 18 single and double lines: 900 plus or minus 20 ℃; phi 20-phi 25 single and double lines: 880 +/-20 ℃;
the temperature of the reducing mill is as follows: phi 10-phi 18 double lines: 860 plus or minus 20 ℃; phi 10-phi 18 single line: 880 plus or minus 20 ℃; phi 20-phi 25 double lines: 830 +/-20 ℃; Φ 20 to Φ 25 single line: 860 +/-20 ℃.
2. The low-cost high-speed bar deformed steel bar with a surface scale thickness of more than 10 μm according to claim 1, wherein the high-speed bar deformed steel bar is HRB400E straight deformed steel bar.
3. The low-cost high-speed bar deformed steel bar with the surface oxide scale thickness of more than 10 μm according to claim 1, wherein the high-speed bar deformed steel bar has the following chemical components: mn: 0.8-0.96 Wt%.
4. The low-cost high-speed bar deformed steel bar with the surface scale thickness of more than 10 μm according to claim 1, wherein the chemical composition of the high-speed bar deformed steel bar is as follows: nb: 0.030-0.035 Wt%.
5. The low-cost high-speed bar deformed steel bar with the surface scale thickness of more than 10 μm according to claim 1, wherein the chemical composition of the high-speed bar deformed steel bar is as follows: c:0.22wt%, si:0.30wt%, P:0.030wt%, S:0.032wt%.
6. The low-cost high-speed bar deformed steel bar with the surface oxide scale thickness of more than 10 μm according to claim 1, wherein the high-speed bar deformed steel bar has the following chemical components: c:0.25wt%, si:0.29wt%, mn:0.90wt%, P:0.029wt%, S:0.031wt%.
7. The low-cost high-speed bar deformed steel bar with the surface scale thickness of more than 10 μm according to claim 1, wherein the chemical composition of the high-speed bar deformed steel bar is as follows: c:0.24wt%, si:0.33wt%, mn:0.96wt%, P:0.031wt%, S:0.028wt%, nb:0.030wt%, N: less than or equal to 0.0048wt percent.
8. The low-cost high-speed bar deformed steel bar with the surface scale thickness of more than 10 μm according to claim 1, wherein the chemical composition of the high-speed bar deformed steel bar is as follows: c:0.20wt%, si:0.26wt%, mn:0.92wt%, P:0.033wt%, S:0.026wt%, N: less than or equal to 0.0045wt percent.
9. The low-cost high-speed bar deformed steel bar with the surface scale thickness of more than 10 μm according to claim 1, wherein the chemical composition of the high-speed bar deformed steel bar is as follows: c:0.23wt%, si:0.31wt%, mn:0.95wt%, P:0.028wt%, S:0.027 wt.%.
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