CN113652601A - High-speed wire threaded steel with small strength fluctuation difference in same circle and surface oxidized iron sheet thickness of more than 10 mu m and production method thereof - Google Patents
High-speed wire threaded steel with small strength fluctuation difference in same circle and surface oxidized iron sheet thickness of more than 10 mu m and production method thereof 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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- 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
- B21B37/76—Cooling control on the run-out table
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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
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides high-speed wire threaded steel with small intensity fluctuation difference in the same circle and surface oxidized iron sheet thickness of more than 10 mu m and a production method thereof, wherein the production method of the high-speed wire threaded steel comprises the following steps: sequentially carrying out blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, square billet continuous casting, high-speed wire rod rolling, spinning, inspection, packaging and warehousing; when rolling high-speed wires, controlling the heating temperature of a casting blank to 1050-1170 ℃, the heating time of a billet to 80-120 minutes, and the starting rolling temperature to 950-1010 ℃; the high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.21-0.25 Wt%, Si: 0.55-0.70 Wt%, Mn: 0.8-0.95 Wt%, P: less than or equal to 0.040 Wt%, S: less than or equal to 0.040 Wt%, Nb: 0.018-0.028 Wt%, N: not more than 0.0065 Wt%, Cr: less than or equal to 0.09 Wt%, B: less than or equal to 0.0009Wt percent. The method can control the yield fluctuation of the same-circle strength of the HRB400E wire rod threaded steel bar with the specification of phi 6-12 mm within 30MPa, and the thickness of the iron scale is more than 10 mu m.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to high-speed wire threaded steel with small intensity fluctuation difference in the same circle and surface oxidized iron sheet thickness of more than 10 mu m and a production method thereof.
Background
At present, the corrosion and performance stability of steel are always hot points concerned by users, and in order to ensure the performance stability, lower rolling temperature and lower spinning temperature are often adopted in the industry. The spinning temperature is too low, although the performance is stable, the thickness and the integrity of the iron scale are affected, and the thickness is only 4-5 μm generally. The thickness and the integrity of the iron scale on the surface of the wire rod are positively correlated with the antirust capability of the wire rod, and the thicker the thickness is, the more complete the thickness is, the better the antirust capability is.
In summary, the following problems exist in the prior art: the rust-proof capability of the surface of the deformed steel bar of the high-speed wire rod is insufficient due to the small thickness of the oxidized iron sheet.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is how to solve the problem of insufficient antirust capability due to small thickness of the oxide scale on the surface of the high-speed wire threaded steel.
Therefore, in one aspect, the embodiment of the invention provides a method for producing a high-speed wire threaded steel with small strength fluctuation difference in the same circle and with a surface scale thickness of more than 10 μm, and the method for producing the high-speed wire threaded steel with small strength fluctuation difference in the same circle and with a surface scale thickness of more than 10 μm comprises the following steps:
sequentially carrying out blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, square billet continuous casting, high-speed wire rod rolling and wire laying;
when rolling high-speed wire rods, controlling the heating temperature of a casting blank to 1050-1170 ℃, the heating time of a billet to 80-120 minutes, and the starting rolling temperature to 950-1010 ℃;
the high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.21-0.25 Wt%, Si: 0.55-0.70 Wt%, Mn: 0.8-0.95 Wt%, P: less than or equal to 0.040 Wt%, S: less than or equal to 0.040 Wt%, Nb: 0.018-0.028 Wt%, N: not more than 0.0065 Wt%, Cr: less than or equal to 0.09 Wt%, B: less than or equal to 0.0009Wt percent.
Specifically, the molten iron S in the converter during the smelting of the molten steel is kept to be less than or equal to 0.040 Wt%, and the whole process of bottom blowing argon is adopted in the smelting process.
Specifically, ladle slag tapping detection control is adopted during square billet continuous casting, the pouring temperature of a tundish is 1525-1545 ℃, and the single flow pulling speed of a casting blank is controlled to be 2.5-4.5 m/min.
Specifically, the wire rod enters a stelmor cooling mode after being rolled at a high speed, the stelmor is set to be a sectional type step roller way, and the speed of the stelmor roller way is not less than 40 m/min.
Specifically, the finish rolling temperature is controlled to be 860-920 ℃.
On the other hand, the embodiment of the invention also provides high-speed wire threaded steel with smaller strength fluctuation difference in the same circle and with the surface oxidized iron sheet thickness of more than 10 micrometers, and a production method of the high-speed wire threaded steel with smaller strength fluctuation difference in the same circle and with the surface oxidized iron sheet thickness of more than 10 micrometers is adopted, wherein the high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.21-0.25 Wt%, Si: 0.55-0.70 Wt%, Mn: 0.8-0.95 Wt%, P: less than or equal to 0.040 Wt%, S: less than or equal to 0.040 Wt%, Nb: 0.018-0.028 Wt%, N: not more than 0.0065 Wt%, Cr: less than or equal to 0.09 Wt%, B: less than or equal to 0.0009Wt percent.
Specifically, the high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.22 Wt%, Si: 0.60 Wt%, Mn: 0.85 Wt%, P: 0.028 Wt%, S: 0.022 Wt%, Nb: 0.022 Wt%, B: 0.0007 Wt%, N: 0.004 Wt%, Cr: 0.06 Wt%.
Specifically, the high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.21 Wt%, Si: 0.58 Wt%, Mn: 0.90 Wt%, P: 0.03 Wt%, S: 0.025 Wt%, Nb: 0.02 Wt%, B: 0.0006 Wt%, N: 0.0055 Wt%, Cr: 0.05 Wt%.
Specifically, the high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.24 Wt%, Si: 0.63 Wt%, Mn: 0.91 Wt%, P: 0.029 Wt%, S: 0.024 Wt%, Nb: 0.025 Wt%, B: 0.0004 Wt%, N: 0.0043 Wt%, Cr: 0.07 Wt%.
Specifically, the high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.25 Wt%, Si: 0.61 Wt%, Mn: 0.87 Wt%, P: 0.027 Wt%, S: 0.028 Wt%, Nb: 0.019 Wt%, B: 0.0005 Wt%, N: 0.0047 Wt%, Cr: 0.04 Wt%.
The production method of the high-speed wire threaded steel with small intensity fluctuation difference in the same circle and the surface oxidized iron sheet thickness of more than 10 mu m ensures a certain rolling speed during rolling, and is stable and high in deformation rate and beneficial to grain refinement. Stelmor sets up sectional type ladder roll table, makes the rolled piece move in the middle of, prevents the off tracking, influences follow-up album and rolls up, falls the in-process, and the coil that the winding overlaps can separate, makes the coil cooling more even. The method can control the yield fluctuation of the same-circle strength of the HRB400E wire rod threaded steel bar with the specification of phi 6-12 mm within 30MPa, and the thickness of the iron scale is more than 10 mu m.
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 wire threaded steel with small intensity fluctuation difference in the same circle and with the surface oxidized iron sheet thickness of more than 10 mu m, which comprises the following steps:
sequentially carrying out blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, square billet continuous casting, high-speed wire rod rolling and wire laying;
when rolling high-speed wire rods, controlling the heating temperature of a casting blank to 1050-1170 ℃, the heating time of a billet to 80-120 minutes, and the starting rolling temperature to 950-1010 ℃;
the high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.21-0.25 Wt%, Si: 0.55-0.70 Wt%, Mn: 0.8-0.95 Wt%, P: less than or equal to 0.040 Wt%, S: less than or equal to 0.040 Wt%, Nb: 0.018-0.028 Wt%, N: not more than 0.0065 Wt%, Cr: less than or equal to 0.09 Wt%, B: less than or equal to 0.0009Wt percent.
Keeping the S content of the molten iron entering the converter in the smelting of the molten steel of the converter to be less than or equal to 0.040Wt percent, and adopting bottom blowing argon in the whole smelting process.
And (3) during the continuous casting of the square billet, adopting ladle slag discharging detection control, controlling the pouring temperature of a tundish to be 1525-1545 ℃, and controlling the uniflow pulling speed of a casting blank to be 2.5-4.5 m/min.
And after the high-speed wire rod is rolled, entering stelmor cooling, wherein the stelmor is set into a sectional type step roller way, and the speed of the stelmor roller way is not less than 40 m/min.
The finish rolling temperature is controlled to be 860-920 ℃.
In order to achieve the purpose, the invention adopts the technical scheme that:
the process route of the invention is as follows: smelting blast furnace molten iron, desulfurizing and pre-treating the molten iron, smelting converter molten steel, continuously casting square billets, rolling at a high speed, spinning, inspecting, packaging and warehousing; wherein, the process characteristics of each stage are as follows:
smelting molten steel in a converter: s is required to be less than or equal to 0.040 Wt% when the molten iron enters the furnace; 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; controlling the end point of the converter to be less than or equal to 0.15 Wt% C and less than or equal to 0.037 Wt% P;
and (3) square billet continuous casting, wherein ladle deslagging detection control is adopted, the pouring temperature of a tundish is 1525-1545 ℃, the tundish uses a common covering agent and common square billet covering slag, and the single flow pulling speed of a casting blank is 2.5-4.5 m/min.
Rolling the high-speed wire rods: the heating temperature of a casting blank is controlled to be 1050-1170 ℃, the heating time of a steel billet is controlled to be 80-120 minutes, and the initial rolling temperature is controlled to be 950-1010 ℃.
The specific technical measures of the invention comprise:
1. reasonable components:
(1) nb is added to control Mn, Cr, B, N and other elements affecting the hardenability of steel. The Nb element has a precipitation strengthening effect, improves the austenite recrystallization temperature, realizes controlled rolling at a higher temperature, and can improve the performance and the thickness of an iron scale; when the contents of Mn, Cr, B and N are higher, the hardenability of steel can be improved, uneven cooling is caused, the stability of the same-circle structure of the steel bars is influenced, and the performance stability is further influenced, so that the steel bars are controlled at a lower level. The strength lost by the elements is compensated by Nb, C and Si elements and controlled rolling and controlled cooling. Because the addition of Nb is beneficial to the formation of a bainite structure and is not beneficial to the stable control of the performance, the contents of Mn, Cr, B and N are controlled to be lower, and the content of Nb is not suitable to be too high.
(2) C, Si, the solid solution strengthening effect is provided, the strength is more stable, and the strength is controlled at a higher level.
According to the influence of the components in the steel on uneven cooling of the wire rod, the Mn content in the steel is properly reduced, Cr brought by scrap steel is controlled, N and B in the steel are controlled, Nb is added, and the Si content is increased, as shown in Table 1.
TABLE 1 vanadium microalloying HRB400E composition (wt%)
2. Designing a rolling mill: 6 roughing mills, 6 middle mills, 6 pre-finishing mills, a controlled cooling device, a recovery section, 8 finishing mills, a controlled cooling device, a recovery section and 2 diameter shearing units (no controlled cooling device is arranged behind the diameter shearing units).
3. The rolling process comprises the following steps:
(1) a cold control device is used in front of a finishing mill group and a diameter shearing unit to control the lower finish rolling temperature and the higher diameter shearing temperature, so that the controlled rolling of an austenite recrystallization region at higher temperature is realized; the cooling control device is not installed or used after the diameter cutting unit, and the higher spinning temperature is controlled (table 2). The carbo-nitride of Nb can pin the grain boundary and prevent the grain from growing.
(2) All cold devices are composed of a plurality of small water tanks, and can be separately controlled to realize graded cold control, the small water tanks cannot be continuously opened, and the surface temperature of a rolled piece is prevented from being too low by using an interval opening mode. When the water tank is used for controlling the temperature, the flow of the single small water tank is 100% and is opened, so that the pressure and the flow are stable, the stable control of the temperature of a rolled piece can be realized, and the stable performance is facilitated.
TABLE 2 Rolling Key temperature
4. Rolling speed: ensures a certain rolling speed, is stable and has higher deformation rate, thus being beneficial to grain refinement. (Table 2)
5. Stelmor roller bed: the No. 1 heat preservation cover and the No. 1 fan are closed, so that the time that the wire rod after spinning is in a high-temperature area is prolonged, and the formation of iron oxide scales is facilitated; and the wire rod in the high-temperature area has fast heat transfer, and the fan and the heat-insulating cover are not opened in the high-temperature area after spinning, so that the temperature of the wire rod is uniform, and the uniformity and the stability of the performance are facilitated.
The stelmor roller way speed is not less than 40 m/min. Stelmor sets up sectional type ladder roll table, makes the rolled piece move in the middle of, prevents the off tracking, influences follow-up album and rolls up, falls the in-process, and the coil that the winding overlaps can separate, makes the coil cooling more even.
6. And (4) checking: before packaging, the length of the non-cold section of the head and the tail of the wire rod is required to be seen, and 8-15 circles of the head and the tail of the wire rod are cut off. And during mechanical inspection, the part after the non-cold section is cut off.
The invention also provides high-speed wire threaded steel with smaller intensity fluctuation difference in the same circle and with the surface oxidized iron sheet thickness of more than 10 mu m, and a production method of the high-speed wire threaded steel with smaller intensity fluctuation difference in the same circle and with the surface oxidized iron sheet thickness of more than 10 mu m is adopted, and the high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.21 to 0.25 Wt%, Si: 0.55-0.70 Wt%, Mn: 0.8-0.95 Wt%, P: less than or equal to 0.040 Wt%, S: less than or equal to 0.040 Wt%, Nb: 0.018-0.028 Wt%, N: not more than 0.0065 Wt%, Cr: less than or equal to 0.09 Wt%, B: less than or equal to 0.0009Wt percent.
The high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.22 Wt%, Si: 0.60 Wt%, Mn: 0.85 Wt%, P: 0.028 Wt%, S: 0.022 Wt%, Nb: 0.022 Wt%, B: 0.0007 Wt%, N: 0.004 Wt%, Cr: 0.06 Wt%.
The high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.21 Wt%, Si: 0.58 Wt%, Mn: 0.90 Wt%, P: 0.03 Wt%, S: 0.025 Wt%, Nb: 0.02 Wt%, B: 0.0006 Wt%, N: 0.0055 Wt%, Cr: 0.05 Wt%.
The high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.24 Wt%, Si: 0.63 Wt%, Mn: 0.91 Wt%, P: 0.029 Wt%, S: 0.024 Wt%, Nb: 0.025 Wt%, B: 0.0004 Wt%, N: 0.0043 Wt%, Cr: 0.07 Wt%.
The high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.25 Wt%, Si: 0.61 Wt%, Mn: 0.87 Wt%, P: 0.027 Wt%, S: 0.028 Wt%, Nb: 0.019 Wt%, B: 0.0005 Wt%, N: 0.0047 Wt%, Cr: 0.04 Wt%.
The production method of the high-speed wire threaded steel with small intensity fluctuation difference in the same circle and the surface oxidized iron sheet thickness of more than 10 mu m ensures a certain rolling speed during rolling, and is stable and high in deformation rate and beneficial to grain refinement. Stelmor sets up sectional type ladder roll table, makes the rolled piece move in the middle of, prevents the off tracking, influences follow-up album and rolls up, falls the in-process, and the coil that the winding overlaps can separate, makes the coil cooling more even. The method can control the yield fluctuation of the same-circle strength of the HRB400E wire rod threaded steel bar with the specification of phi 6-12 mm within 30MPa, and the thickness of the iron scale is more than 10 mu m.
Example (b):
the invention adopts the following component proportions and specific processes for controlling the same-circle strength fluctuation and the thickness of an iron scale of a HRB400E wire rod threaded steel bar with the specification of phi 6-12 mm. Wherein, table 3 is the composition (in weight percent) of the steels of the respective examples. Table 4 shows the production specifications, process parameters, and mechanical properties corresponding to the example steels described in table 1. Designing a produced rolling mill: 6 roughing mills, 6 middle mills, 6 pre-finishing mills, a controlled cooling device, a recovery section, 8 finishing mills, controlled cooling, a recovery section and 2 diameter shearing units. The stelmor first stage roller speed was 40 m/min. The mechanical properties were tested after cutting off the head and tail of the coil rod for 12 turns each.
Table 3: chemical composition (wt%) of product
| Examples of the invention | C | Si | Mn | P | S | Nb | B | N | Cr |
| Example 1 | 0.22 | 0.60 | 0.85 | 0.028 | 0.022 | 0.022 | 0.0007 | 0.0040 | 0.06 |
| Example 2 | 0.21 | 0.58 | 0.90 | 0.030 | 0.025 | 0.020 | 0.0006 | 0.0055 | 0.05 |
| Example 3 | 0.24 | 0.63 | 0.91 | 0.029 | 0.024 | 0.025 | 0.0004 | 0.0043 | 0.07 |
| Example 4 | 0.25 | 0.61 | 0.87 | 0.027 | 0.028 | 0.019 | 0.0005 | 0.0047 | 0.04 |
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 is within the scope of the present invention that any person skilled in the art may make equivalent changes and modifications without departing from the spirit and principle of the present invention.
Claims (10)
1. A production method of high-speed wire threaded steel with small intensity fluctuation difference in the same circle and with the surface oxidized iron sheet thickness of more than 10 micrometers is characterized by comprising the following steps of:
sequentially carrying out blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, square billet continuous casting, high-speed wire rod rolling and wire laying;
when rolling high-speed wires, controlling the heating temperature of a casting blank to 1050-1170 ℃, the heating time of a billet to 80-120 minutes, and the starting rolling temperature to 950-1010 ℃;
the high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.21-0.25 Wt%, Si: 0.55-0.70 Wt%, Mn: 0.8-0.95 Wt%, P: less than or equal to 0.040 Wt%, S: less than or equal to 0.040 Wt%, Nb: 0.018-0.028 Wt%, N: not more than 0.0065 Wt%, Cr: less than or equal to 0.09 Wt%, B: less than or equal to 0.0009Wt percent.
2. The method for producing the high-speed wire deformed steel bar with small intensity fluctuation difference and the surface iron scale thickness of more than 10 μm according to claim 1, wherein the molten steel in the converter is kept at the molten iron S of less than or equal to 0.040 Wt% during the smelting process, and argon is blown from the bottom in the whole smelting process.
3. The method for producing a high-speed wire-rod-shaped deformed steel bar with small intensity fluctuation difference in the same circle and the surface oxide scale thickness of more than 10 μm according to claim 1, wherein ladle deslagging detection control is adopted during square billet continuous casting, the pouring temperature of a tundish is 1525-1545 ℃, and the single flow drawing speed of a casting blank is controlled to be 2.5-4.5 m/min.
4. The method for producing a high-speed wire-rod deformed steel bar having a small variation in strength among turns and a surface oxide scale thickness of 10 μm or more according to claim 1, wherein the high-speed wire rod is cooled after being rolled, and the stelmor is provided as a stepped segmented roller table having a speed of not less than 40 m/min.
5. The method for producing a high-speed wire-rod deformed steel bar having a small variation in strength in the same revolution and a surface oxide scale thickness of 10 μm or more according to claim 1, wherein the finish rolling temperature is controlled to 860 to 920 ℃.
6. The production method of the high-speed wire threaded steel with small strength fluctuation difference in the same circle and the surface oxidized iron sheet thickness of more than 10 μm, which is characterized by adopting the production method of the high-speed wire threaded steel with small strength fluctuation difference in the same circle and the surface oxidized iron sheet thickness of more than 10 μm as claimed in claim 1, wherein the high-speed wire threaded steel comprises the following chemical components in percentage by weight: c: 0.21-0.25 Wt%, Si: 0.55-0.70 Wt%, Mn: 0.8-0.95 Wt%, P: less than or equal to 0.040 Wt%, S: less than or equal to 0.040 Wt%, Nb: 0.018-0.028 Wt%, N: not more than 0.0065 Wt%, Cr: less than or equal to 0.09 Wt%, B: less than or equal to 0.0009Wt percent.
7. The high-speed wire deformed steel bar with small intensity fluctuation difference and the surface oxidized iron sheet thickness of more than 10 μm in the same circle as the claim 6, which is characterized by comprising the following chemical components in percentage by weight: c: 0.22 Wt%, Si: 0.60 Wt%, Mn: 0.85 Wt%, P: 0.028 Wt%, S: 0.022 Wt%, Nb: 0.022 Wt%, B: 0.0007 Wt%, N: 0.004 Wt%, Cr: 0.06 Wt%.
8. The high-speed wire deformed steel bar with small intensity fluctuation difference and the surface oxidized iron sheet thickness of more than 10 μm in the same circle as the claim 6, which is characterized by comprising the following chemical components in percentage by weight: c: 0.21 Wt%, Si: 0.58 Wt%, Mn: 0.90 Wt%, P: 0.03 Wt%, S: 0.025 Wt%, Nb: 0.02 Wt%, B: 0.0006 Wt%, N: 0.0055 Wt%, Cr: 0.05 Wt%.
9. The high-speed wire deformed steel bar with small intensity fluctuation difference and the surface oxidized iron sheet thickness of more than 10 μm in the same circle as the claim 6, which is characterized by comprising the following chemical components in percentage by weight: c: 0.24 Wt%, Si: 0.63 Wt%, Mn: 0.91 Wt%, P: 0.029 Wt%, S: 0.024 Wt%, Nb: 0.025 Wt%, B: 0.0004 Wt%, N: 0.0043 Wt%, Cr: 0.07 Wt%.
10. The high-speed wire deformed steel bar with small intensity fluctuation difference and the surface oxidized iron sheet thickness of more than 10 μm in the same circle as the claim 6, which is characterized by comprising the following chemical components in percentage by weight: c: 0.25 Wt%, Si: 0.61 Wt%, Mn: 0.87 Wt%, P: 0.027 Wt%, S: 0.028 Wt%, Nb: 0.019 Wt%, B: 0.0005 Wt%, N: 0.0047 Wt%, Cr: 0.04 Wt%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110763383.8A CN113652601B (en) | 2021-07-06 | 2021-07-06 | High-speed wire threaded steel with small intensity fluctuation difference and surface iron scale thickness of more than 10 mu m in same circle and production method thereof |
| CN202211385334.6A CN115652178B (en) | 2021-07-06 | 2021-07-06 | High-speed wire rod screw steel with small same-circle strength fluctuation difference and surface oxide scale thickness of more than 10 mu m |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110763383.8A CN113652601B (en) | 2021-07-06 | 2021-07-06 | High-speed wire threaded steel with small intensity fluctuation difference and surface iron scale thickness of more than 10 mu m in same circle and production method thereof |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211385334.6A Division CN115652178B (en) | 2021-07-06 | 2021-07-06 | High-speed wire rod screw steel with small same-circle strength fluctuation difference and surface oxide scale thickness of more than 10 mu m |
Publications (2)
| Publication Number | Publication Date |
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| CN113652601A true CN113652601A (en) | 2021-11-16 |
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| CN114836608A (en) * | 2022-04-26 | 2022-08-02 | 包头钢铁（集团）有限责任公司 | Production method for reducing performance same-circle difference of HRB400E disc spiral steel bar |
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| CN115652178B (en) | 2023-07-14 |
| CN113652601B (en) | 2022-11-29 |
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