CN115725898B - High-speed bar screw thread steel with low cost and surface oxide scale thickness of more than 10 mu m - Google Patents
High-speed bar screw thread steel with low cost and surface oxide 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
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- 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
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Abstract
The invention provides a high-speed bar threaded steel with low cost and surface oxide scale thickness of more than 10 mu m, which comprises the following chemical components in percentage by weight: c:0.20 to 0.25Wt percent, si: less than or equal to 0.35Wt percent, mn:0.8 to 1.1Wt percent, P: less than or equal to 0.045wt%, S: less than or equal to 0.045wt%, nb:0.015 to 0.035wt%, N: less than or equal to 0.009wt%; the balance of iron and unavoidable impurities, the thickness of the surface iron scale of the steel bar produced by double-line double-segmentation is increased to 10 mu m or more, and the thickness of the surface iron scale of the steel bar produced by single-line production is increased to 12 mu m or more.
Description
The invention is as follows: 2021105928685, filing date: 2021, 5, 28, title: a method for producing high-speed bar threaded steel with low cost and surface oxide scale thickness of more than 10 mu m is applied separately.
Technical Field
The invention relates to the field of metallurgy, in particular to high-speed bar screw thread steel with low cost and surface oxide scale thickness of more than 10 mu m.
Background
At present, the external dimension of the steel bar produced by the high-speed bar is well controlled, the final rolling speed can reach 45 m/s or more, the advantages of high yield, high quality and low cost are achieved, and the method is a development trend of the production of the current medium-small-specification deformed bar. The single-line and two-line high-speed bars are braked by using a brake roller before being fed into a cooling bed after finish rolling, and when the temperature of the cooling bed on the steel bar is too high, the brake roller can easily press the steel bar to deform if the clamping force is too high, and the external dimension exceeds national standard; if the clamping force is too small, the braking effect is insufficient. Therefore, domestic high-speed bar production lines often use a controlled rolling and cooling process and a cooling bed at a lower temperature, the strength of the steel bars is improved to resist the braking pressure, the braking effect is achieved, and the alloy consumption and the production cost are reduced. But the lower upper cooling bed temperature makes the iron scale of the steel bar produced by the high-speed bar production line thinner (usually less than or equal to 7 mu m), and the rust resistance of the steel bar is weakened when the thickness of the iron scale is thinner, thus influencing the appearance and sales of products.
In summary, the following problems exist in the prior art: how to increase the thickness of the iron scale and enhance the rust resistance of the steel bar.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is how to increase the thickness of the iron scale and enhance the rust resistance of the steel bar.
Therefore, in one aspect, the embodiment of the invention provides a method for producing high-speed bar threaded steel with a low cost and a surface oxide scale thickness of more than 10 μm, which comprises the following steps:
the method comprises the following steps of blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, argon blowing, LF refining, billet continuous casting, heating by a heating furnace, rough rolling, middle rolling, pre-finish rolling, controlled cooling and recovery, finish rolling, controlled cooling after rolling and recovery;
the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.20 to 0.25Wt percent, si: less than or equal to 0.35Wt percent, mn:0.8 to 1.1Wt percent, P: less than or equal to 0.045wt%, S: less than or equal to 0.045wt%, nb:0.015 to 0.035wt%, N: less than or equal to 0.009wt%;
the heat preservation device is used on the cooling bed, and the storage mode of the steel bars of the cooling bed is changed from one tooth to a plurality of teeth, so that the heat dissipation is slowed down, and the residence time of the steel bars on the cooling bed in a high-temperature area is prolonged;
the deformation of the last two frame passes is more than 17%.
Specifically, the high-speed bar deformed steel bar is an HRB400E straight deformed steel bar.
Specifically, the billet is heated for 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%.
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%.
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%.
On the other hand, the embodiment of the invention also provides a low-cost high-speed bar threaded steel with the surface oxide scale thickness of more than 10 mu m, which adopts a production method of the low-cost high-speed bar threaded steel with the surface oxide scale thickness of more than 10 mu m, and the high-speed bar threaded steel comprises the following chemical components in percentage by weight: c:0.20 to 0.25Wt percent, si: less than or equal to 0.35Wt percent, mn:0.8 to 1.1Wt percent, P: less than or equal to 0.045wt%, S: less than or equal to 0.045wt%, nb:0.015 to 0.035wt%, N: less than or equal to 0.009Wt percent.
Specifically, the high-speed bar deformed steel bar is an HRB400E straight deformed steel bar.
The production method of the high-speed bar threaded steel with low cost and the surface oxide 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 amount of the silicon-manganese alloy is reduced, and the production cost is reduced. Meanwhile, the austenite recrystallization temperature is increased, unrecrystallized rolling at a higher temperature is realized, the precipitation strengthening effect is achieved, the strength is improved, and meanwhile, the thickness of the oxide scale is increased; the thickness of the oxide scale on the surface of the steel bar is increased to more than 10 mu m while the high yield and the high finishing rolling speed of the high-speed bar are maintained, and the surface quality is good and the mechanical property is qualified.
Detailed Description
The present invention will now be described for a clearer understanding of technical features, objects, and effects of the present invention.
The invention provides a production method of high-speed bar threaded steel 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 desulfurization pretreatment, converter molten steel smelting, argon blowing, square billet continuous casting, heating by a heating furnace, rough rolling (6 frames), middle rolling (6 frames), pre-finish rolling (6 frames), single line, cooling control and recovery section, finish rolling (4 frames), finish rolling (2 frames of shearing diameter), cooling control and recovery section after rolling, pinch roll, disc double-length shearing, braking device, hub device, cooling bed cooling, fixed-length shearing, inspection packaging and warehousing
The production process of the double-wire high-speed bar steel bar comprises the following steps: blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, argon blowing, billet continuous casting, heating by a heating furnace, rough rolling (6 frames), middle rolling (6 frames), pre-finish rolling (6 frames) and cutting into double lines, controlled cooling and recovery sections X2, finish rolling (4 frames) X2, shearing diameter 2 frames X2, post-rolling controlled cooling and recovery sections X2, pinch rolls X2, disc multiple-length shears X2, a braking device X2, a hub device X2, cooling by a cooling bed, fixed-length shearing, inspection packaging and warehousing of converter molten steel smelting: the requirement S for molten iron entering the furnace is less than or equal to 0.050wt%; argon is blown at the bottom in the whole smelting process, the gas flow is increased in the later period of blowing, and the stirring of a molten pool is enhanced; the converter endpoint control C is less than or equal to 0.15wt% and P is less than or equal to 0.037wt%.
And (3) billet continuous casting, namely adopting ladle slag tapping detection control, wherein the pouring temperature of a tundish is 1520-1540 ℃, a common covering agent is used for the tundish, a common billet covering slag is used for the tundish, and the single-flow drawing speed of a casting blank is 3.0-4.0 m/min.
The components adopt low Si, the surface is not reddish, and the iron scale is good; the Mn is low, si iron is not added, and the Mn brought by the Si-Mn alloy is only used; nb is added to improve the austenite recrystallization temperature, so that a foundation is provided for realizing controlled rolling; the N element in the steel is controlled in a reasonable interval, so that most N is combined with Nb to reduce free N in the steel.
1. The components are as follows:
(1) Low Si: silicon contained in the silicon killed steel can form pits in the iron scale layer and expand silicate in the iron scale, so that the adhesion of the iron scale to the steel is increased, and the iron scale of the final product is distributed in red, black or red-black phases. Therefore, the composition design controls low Si, only Si-Mn alloy is added for deoxidization alloying during converter alloying, si-Fe deoxidization alloying is not added, si in the steel is kept at a lower level, the production of iron scale is facilitated, and the cost can be reduced.
(2) Low Mn: mn has the effects of solid solution strengthening and improves the hardenability of steel to enable a CCT curve to move right, mn is controlled at a lower level, the cost can be reduced, the hardenability of the steel is stably controlled, and the lost strength is compensated by fine grain strengthening at a lower temperature.
(3) And adding Nb to raise the recrystallization temperature of austenite, realize unrecrystallized rolling at higher temperature, have the effect of precipitation strengthening, raise strength and increase the thickness of iron oxide scale. Nb is low in the small specification and high in the large specification.
(4) N element in steel is controlled in a reasonable interval, and N and Nb are combined to produce a compound, so that the effect of precipitation strengthening is achieved. Meanwhile, the condition that the solid solution form N in the steel is too high is avoided, the solid solution form N 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 under a certain cooling speed, the normal transformation from austenite to ferrite and pearlite structures is incomplete, and part of austenite is transformed into granular bainite, the formation of bainite structures in the steel is promoted, and the plasticity of the steel is poor. The upper limit of N control in the steel with the cooling speed of the cooling bed being too high is slightly lower in the small specification, and the upper limit of N control in the steel with the cooling speed of the cooling bed being slower in the large specification is slightly higher.
(5) The control method of N is as follows: the nitrogen content and the oxygen content of the converter end point are in a certain proportional relation, the oxygen content or oxygen element [ O ] of the converter end point is controlled to be less than or equal to 0.09%, and argon is used as bottom blowing gas of the converter; argon is used for bottom blowing of an argon ladle, a ladle covering agent is added before argon blowing, so that naked N absorption of molten steel is avoided, and the naked area of the surface of the molten steel of the ladle is controlled to be less than 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), after the argon is blown into the ladle, argon bubbles formed in the molten steel are in vacuum conditions relative to oxygen, nitrogen and hydrogen in the steel, the oxygen, the nitrogen and the hydrogen diffuse into the argon bubbles and are carried out along with the rising of the argon bubbles; the continuous casting process uses a ladle long nozzle for protection casting and argon protection (the argon flow is more than 20L/min), and a sealing gasket for controlling nitrogen increase in steel.
TABLE 1 HRB400E component (wt%)
2. And (3) rolling line arrangement: 6 roughing stands, 6 intermediate stands, 6 pre-finish rolling stands, a cooling control device, a recovery section, 4 finishing mill groups, a cooling control device, a recovery section and 2 reducing mills.
6 short stress line rolling mills of the roughing mill set, 6 short stress line rolling mills of the middle rolling mill set and 6 short stress line rolling mills of the pre-finish rolling mill set (all the frames are connected through a loop, the bar is subjected to two-section from the 4 th frame, and the bar enters two channels respectively at the pre-finish rolling outlet)
The finishing mill comprises two lines, namely a 4-frame 45-degree top-cross cantilever (V-shaped) torsion-free overweight load type Morgan mill, wherein 2 groups of modules are adopted, each group of modules is independently driven by a motor, and compared with collective transmission, the finishing mill has the following advantages: 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; and the overhaul and the maintenance are convenient.
The reducing machine set adopts a 2-frame 45-degree top-intersecting cantilever reducing machine for independent transmission. The reduction unit is added to realize rolling (namely hot engine rolling) in a two-phase region or below the recrystallization temperature, and the deformation system of the last two passes is designed to break crystal grains and induce ferrite phase transformation by adding deformation so as to achieve the aim of refining the crystal grains and improving the performance of the steel. In addition, the production rate of the rolling mill, the dimensional tolerance and the surface quality of the product, the variety and the specification are increased, the metallurgical performance of the product is improved, and the like can be improved.
The heat preservation device is used on the cooling bed, and the storage mode of the steel bars of the cooling bed is changed from one tooth to a plurality of teeth, so that the heat dissipation is slowed down, and the residence time of the steel bars on the cooling bed in a high-temperature area is prolonged;
the deformation of the last two frame passes is more than 17%.
The high-speed bar deformed steel bar is an HRB400E straight deformed steel bar.
The billet is heated for 60-90 minutes, and the initial rolling temperature is 1000-1040 ℃.
3. The rolling process comprises the following steps:
(1) The billet heating time is 60-90 minutes, and the initial rolling temperature is as follows: 1020.+ -. 30 ℃.
(2) Double-line and single-line rolling with the specification of phi 10-phi 18 mm: the temperature of the entering finish rolling and the temperature of the entering reducing mill are controlled, because Nb increases the austenite recrystallization temperature, the austenite can be rolled without recrystallization at a higher temperature, and no cooling control equipment is required to be arranged after the reducing mill, so that the forming of the oxide scale is facilitated, and the temperature of the entering reducing mill can be slightly higher due to the large deformation during single-line rolling, so that the forming of the oxide scale is more facilitated.
(3) Double-line and single-line rolling with phi 20-phi 25 specifications: the finishing mill group is not put into use, the water tanks after finish rolling and finish rolling are used by utilizing the thought of graded cooling control and kept in a long-open state, the excessive intensity of primary cooling is avoided, the control of tissues and iron scales is not facilitated, and the temperature of the reducing mill can be slightly higher due to the large deformation during single-line rolling, so that the method is more beneficial to the generation of the iron scales. The cooling control equipment is not installed and used before the upper cooling bed after the reducing mill, so that the steel bars are in a natural cooling state, and the surface of the steel bars obtains higher temperature of the upper cooling bed.
(4) The pass deformation of the last two frames (K1, K2) is more than 17%.
TABLE 2 Rolling Key temperature (wt%)
(5) The heat preservation device is used on the cooling bed, and the storage mode of the steel bars of the cooling bed is changed from one tooth to a plurality of teeth, so that the heat dissipation is slowed down, and the residence time of the steel bars on the cooling bed in a high temperature area is increased.
The measures can increase the thickness of the surface iron scale of the steel bar produced by double-line double-cutting to 10 mu m or more and the thickness of the surface iron scale of the steel bar produced by single line to 12 mu m or more when the final rolling speed of the 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%.
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%.
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%.
The invention also provides a low-cost high-speed bar threaded steel with the surface scale thickness of more than 10 mu m, which adopts a production method of the low-cost high-speed bar threaded steel with the surface scale thickness of more than 10 mu m, and the high-speed bar threaded steel comprises the following chemical components in percentage by weight: c:0.20 to 0.25Wt percent, si: less than or equal to 0.35Wt percent, mn:0.8 to 1.1Wt percent, P: less than or equal to 0.045wt%, S: less than or equal to 0.045wt%, nb:0.015 to 0.035wt%, 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%.
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%.
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%.
The high-speed bar deformed steel bar is an HRB400E straight deformed steel bar. Compared with the HRB400E steel bar of the conventional production line, the addition amount of the silicon-manganese alloy is reduced, and the production cost is reduced. The thickness of the oxide scale on the surface of the steel bar is increased to more than 10 mu m while the high yield and the high finishing rolling speed of the high-speed bar are maintained, and the surface quality is good and the mechanical property is qualified.
The production method of the high-speed bar threaded steel with low cost and the surface oxide 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 amount of the silicon-manganese alloy is reduced, and the production cost is reduced. Meanwhile, the austenite recrystallization temperature is increased, unrecrystallized rolling at a higher temperature is realized, the precipitation strengthening effect is achieved, the strength is improved, and meanwhile, the thickness of the oxide scale is increased; the thickness of the oxide scale on the surface of the steel bar is increased to more than 10 mu m while the high yield and the high finishing rolling speed of the high-speed bar are maintained, and the surface quality is good and the mechanical property is qualified.
Examples:
1. the process for producing the phi 10-25 mm straight twisted steel by the double-wire high-speed bar comprises the following steps: blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, argon blowing, square billet continuous casting, heating by a heating furnace, rough rolling (6 frames), middle rolling (6 frames), pre-finish rolling (6 frames) and cutting into double lines, cooling control and recovery sections X2, finish rolling (4 frames) X2, diameter shearing 2 frames X2, cooling control and recovery sections X2 after rolling, pinch rolls X2, disc multiple-length shears X2, a braking device X2, a hub device X2, cooling by a cooling bed, cutting to a fixed length, inspecting, packaging and warehousing.
2. The billet is heated for 60-90 minutes, and the initial rolling temperature is 1000-1040 ℃.
3. The following components and specific processes are adopted. Wherein, table 3 is the composition (in weight%) of each example steel. 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%)
| Examples | 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 technological parameters and mechanical properties of each embodiment
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. In order that the components of the invention may be combined without conflict, any person skilled in the art shall make equivalent changes and modifications without departing from the spirit and principles of the invention.
Claims (9)
1. A low-cost high-speed bar screw steel with a surface oxide scale thickness of more than 10 mu m is characterized in that,
the high-speed bar deformed steel bar comprises the following chemical components in percentage by weight: c:0.20 to 0.25 weight percent, si: less than or equal to 0.35 weight percent, mn:0.8 to 1.1 weight percent, P: less than or equal to 0.045wt%, S: less than or equal to 0.045wt percent, nb:0.015 to 0.035 weight percent, N: less than or equal to 0.009wt%; the balance of iron and unavoidable impurities;
the production method of the high-speed bar screw-thread steel adopts the following steps:
sequentially carrying out blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, argon blowing, LF refining, billet continuous casting, heating by a heating furnace, rough rolling, middle rolling, pre-finish rolling, controlled cooling and recovery, finish rolling, entering a reducing mill, and controlled cooling and recovery after rolling;
the billet heating time is 60-90 minutes, and the initial rolling temperature is 1000-1040 ℃;
the heat preservation device is used on the cooling bed, and the storage mode of the steel bars of the cooling bed is changed from one tooth to a plurality of teeth, so that the heat dissipation is slowed down, and the residence time of the steel bars on the cooling bed in a high-temperature area is prolonged;
the pass deformation of the last two frames is more than 17%;
the final rolling speed of the high-speed bar production line is 30-45 m/s, the thickness of the surface iron scale of the steel bar produced by double-line double-segmentation is increased to 10 mu m or more, and the thickness of the surface iron scale of the steel bar produced by single-line production is increased to 12 mu m or more;
finish rolling temperature: single and double lines of Φ10- Φ18: 900+/-20 ℃; single and double lines of phi 20-phi 25: 880+ -20 ℃;
inlet reducing mill temperature: phi 10-phi 18 double wire: 860±20 ℃; single line of phi 10-phi 18: 880+ -20 ℃; phi 20-phi 25 double wire: 830+/-20 ℃; single line of phi 20-phi 25: 860±20 ℃.
2. The low cost high speed bar deformed steel bar with a surface scale thickness of 10 μm or more according to claim 1, wherein the high speed bar deformed steel bar is an HRB400E straight deformed steel bar.
3. The low-cost high-speed bar screw-thread steel with a surface scale thickness of 10 μm or more according to claim 1, wherein the high-speed bar screw-thread steel has the chemical composition that: mn:0.8 to 0.96 weight percent.
4. The low-cost high-speed bar screw-thread steel with a surface scale thickness of 10 μm or more according to claim 1, wherein the high-speed bar screw-thread steel has the chemical composition that: nb:0.030 to 0.035 percent by weight.
5. The low-cost high-speed bar screw-thread steel with a surface scale thickness of 10 μm or more according to claim 1, wherein the high-speed bar screw-thread steel has the chemical composition that: c:0.22wt%, si:0.30wt%, P:0.030wt%, S:0.032wt%.
6. The low-cost high-speed bar screw-thread steel with a surface scale thickness of 10 μm or more according to claim 1, wherein the high-speed bar screw-thread steel has the chemical composition that: c:0.25wt%, si:0.29wt%, mn:0.90wt%, P:0.029wt%, S:0.031wt%.
7. The low-cost high-speed bar screw-thread steel with a surface scale thickness of 10 μm or more according to claim 1, wherein the high-speed bar screw-thread steel has the chemical composition that: 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%.
8. The low-cost high-speed bar screw-thread steel with a surface scale thickness of 10 μm or more according to claim 1, wherein the high-speed bar screw-thread steel has the chemical composition that: c:0.20wt%, si:0.26wt%, mn:0.92wt%, P:0.033wt%, S:0.026wt%, N: less than or equal to 0.0045wt%.
9. The low-cost high-speed bar screw-thread steel with a surface scale thickness of 10 μm or more according to claim 1, wherein the high-speed bar screw-thread steel has the chemical composition that: c:0.23wt%, si:0.31wt%, mn:0.95wt%, P:0.028wt%, S:0.027wt%.
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