CN113680815B - Steel rolling method for reducing impurity clamping size of cord steel plate - Google Patents
Steel rolling method for reducing impurity clamping size of cord steel plate Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 139
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 94
- 239000010959 steel Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000012535 impurity Substances 0.000 title claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000009987 spinning Methods 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims description 38
- 239000000446 fuel Substances 0.000 claims description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 11
- 239000003546 flue gas Substances 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- 238000001514 detection method Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920013754 low-melting plastic Polymers 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
-
- 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
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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a steel rolling method for reducing the size of impurities in a cord steel plate. The steel rolling method for reducing the impurity size of the cord steel wire rod provided by the invention provides a new inclusion control thought, and the impurity size of the cord steel wire rod can be effectively reduced in the rolling process by optimizing the heating temperature, the rolling surface temperature, the spinning temperature and the air cooling speed in the rolling process, and the prepared cord steel wire rod impurity has the characteristics of small size, easiness in deformation and the like, so that the drawing breakage rate of the cord steel caused by impurities is obviously reduced.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a steel rolling method for reducing the size of impurities in a cord steel plate.
Background
Steel cords are common rubber matrix materials and are widely used in radial tires for various automobiles, trucks, and airplanes. In the production process of the steel cord, the cord steel wire rod raw material with the diameter of 5.5mm needs to be drawn into filaments with the diameter of 0.15-0.38 mm, and the elongation rate can reach 1000 times. In the drawing process, the temperature of the steel wire is generally not more than 300 ℃, at the temperature, inclusions in the steel wire are very fragile and do not generate plastic deformation, the size of the inclusions is basically unchanged, and the diameter of the steel wire is continuously reduced along with the drawing process, so that the relative area of the inclusions is continuously increased and the damage is gradually increased on the cross section of the steel wire where the inclusions are located. If the size of the inclusions in the cross section can be reduced, the workability of the steel cord wire rod can be improved, and the downstream industry technology progress can be promoted.
Therefore, research and development personnel of iron and steel enterprises do a great deal of work to improve the cleanliness of cord steel, reduce the size of inclusions in continuous casting billets and obtain remarkable results, but the number of inclusions in the pursued steel is extremely small, the cleanliness of molten steel is extremely high, and the process route is generally treated by RH, so that the process flow is long and the production cost is high.
However, from another point of view, if the inclusions can be deformed simultaneously during the rolling, the size of the inclusions in the cross section of the wire rod can be reduced. However, most of the inclusions belong to composite oxides, have a high melting point, and are difficult to deform under ordinary rolling conditions. In recent years, the inclusion control level has been increasing, and a system mainly comprising low-melting inclusions whose melting point can be controlled at about 1200 ℃ has been developed, for example, a method for controlling ultra-low-melting plastic inclusion, which can obtain SiO with low melting point, has been disclosed in the prior art 2 -MnO-(CaO-MgO-Al 2 O 3 ) Inclusions of the system of SiO 2 ≥45％、MnO≥20％、CaO-MgO-Al 2 O 3 Less than or equal to 25 percent and a small amount of other components, which provides conditions for controlling the size of the steel rolling inclusion. Unfortunately, there is no report in the prior art on the reduction of inclusion size with simultaneous shrinkage of the inclusion size during rolling.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects of the prior art that the size of inclusions in the steel wire rod of the cord is difficult to reduce, the related study that the sizes of the inclusions are simultaneously reduced in the steel rolling process is not performed, and the like, so that the steel rolling method for reducing the sizes of the inclusions in the steel wire rod of the cord is provided.
Therefore, the invention provides the following technical scheme:
the invention provides a steel rolling method for reducing the impurity clamping size of a cord steel plate, which comprises the following steps:
blank preparation: the blank is low-melting-point inclusion cord steel;
and (3) heat treatment: the method comprises the steps of preheating, heating and soaking, wherein the temperature of the preheating stage is 1000-1050 ℃, the temperature of the heating stage is 1250-1300 ℃, and the temperature of the soaking stage is 1250-1300 ℃;
rolling treatment: the initial rolling temperature is 1150-1200 ℃, the surface temperature of rolled pieces is 1150-1300 ℃, the final rolling speed is more than or equal to 100m/s, and the spinning temperature is 980-1020 ℃;
and (3) cooling treatment: the cooling rate is 10-20 ℃/s.
Optionally, the air-fuel ratio of the heating stage and the soaking stage is less than or equal to 0.6, and the moisture content in the flue gas is less than or equal to 5%.
Optionally, the air-fuel ratio of the heating stage and the soaking stage is 0.4-0.6.
Optionally, the temperature difference in the length direction of the blank soaking stage is less than or equal to 40 ℃;
optionally, the temperature difference of the length direction is 20-40 ℃ when the blank is heated.
Optionally, the finishing rate is 100-110m/s.
Optionally, when the room temperature is more than 20 ℃, the laying temperature is controlled to 980-1000 ℃;
when the room temperature is less than or equal to 20 ℃, the laying temperature is controlled to be 1000-1020 ℃.
Optionally, in the cooling treatment step, a stelmor air cooling line is adopted, and when the room temperature is more than 20 ℃, the number 1-3 fan is set to be 100% of rated air quantity, and the number 4-5 fan is set to be 40-60% of rated air quantity;
when the room temperature is less than or equal to 20 ℃, the number 1-3 fan is set to 90-95% of rated air quantity, and the number 4-5 fan is set to 30-50% of rated air quantity.
Optionally, the low-melting-point inclusion cord steel refers to cord steel with inclusion melting point below 1200 ℃;
optionally, the low melting point inclusion cord steel is LX72A, LX82A, LX86A, LX92A or LX96A.
The invention provides a cord steel wire rod, which is prepared by adopting the rolling method.
The technical scheme of the invention has the following advantages:
the steel rolling method for reducing the impurity size of the cord steel wire rod provided by the invention provides a new inclusion control thought, and the impurity size of the cord steel wire rod can be effectively reduced in the rolling process by optimizing the heating temperature, the rolling surface temperature, the spinning temperature and the air cooling system in the rolling process, and the prepared cord steel wire rod impurity has the characteristics of small size, easiness in deformation and the like, so that the drawing breakage rate of the cord steel caused by impurities is obviously reduced. Specifically, by adopting the technical scheme, the furnace temperature of the soaking section of the cord steel casting blank is increased to 1250-1300 ℃, the initial rolling temperature is controlled to 1150-1200 ℃, the low-melting-point inclusion in the blank can be heated to the vicinity of the melting point, the temperature of the low-melting-point inclusion is reduced to below the solidus temperature of the inclusion when the rolling temperature is carried out, the deformability of the inclusion can reach a better state although the inclusion is not in a liquid state, if the inclusion is in a molten state when the rolling is carried out, the deformation of the inclusion is necessarily facilitated, and broken wires are not easy to generate in the wire rod drawing process. Meanwhile, the temperature in the rolling process is controlled to 1150-1300 ℃, and the spinning temperature and the fan are matched to ensure that the structure performance suitable for drawing can be obtained under different room temperature conditions in the rolling process.
The steel rolling method for reducing the impurity size of the cord steel plate strip provided by the invention also needs to control the air-fuel ratio and the water vapor content in the heating furnace within a certain range, so that the problems of decarburization, coarse grains and the like caused by high-temperature heating can be reduced under the high-temperature heating condition.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge.
Example 1
The embodiment provides a steel rolling method for reducing the impurity size of a cord steel plate, which comprises the following specific steps:
the rolled blank is LX82A, the rolling specification is 5.5mm, the temperature of a preheating section of a heating furnace is controlled to be 1000-1030 ℃, the temperature of a heating section is controlled to be 1250-1280 ℃, and the temperature of a soaking section is controlled to be 1250-1280 ℃; the air-fuel ratio of the heating stage and the soaking stage is controlled to be 0.55, and the moisture content in the flue gas is less than or equal to 5 percent; controlling the temperature difference of the blank in the length direction of the soaking stage to be about 40 ℃;
performing high-line torsion-free rolling by adopting a rolling mill layout of 6-pass rough rolling and 6-pass middle rolling, 4-pass pre-finish rolling and 10-pass finish rolling, controlling the initial rolling temperature to 1150-1180 ℃, controlling the surface temperature of rolled pieces in the rolling process to 1150-1200 ℃, controlling the rolling speed to 105m/s and controlling the wire-laying temperature to 980-1000 ℃;
and (3) adjusting the air quantity of the fans 1-5 on the air cooling line to be 100%, 60%, 50% of rated air quantity, and closing the rest fans, wherein the specification is 5.5mm.
The obtained cord steel wire rod was subjected to inclusion detection, 12 cross sections were taken per furnace, and the size of the inclusion was 8 μm at the maximum.
Example 2
The embodiment provides a steel rolling method for reducing the impurity size of a cord steel plate, which comprises the following specific steps:
the rolled blank is LX86A, the rolling specification is 5.5mm, the preheating section temperature of the heating furnace is controlled to 1010-1050 ℃, the heating section temperature is controlled to 1260-1290 ℃, the soaking section temperature is controlled to 1260-1290 ℃, the air-fuel ratio of the heating stage and the soaking stage is controlled to be 0.58, and the moisture content in the flue gas is less than or equal to 5%; controlling the temperature difference in the length direction of the blank soaking stage to be about 35 ℃;
performing high-line torsion-free rolling by adopting a rolling mill layout of 6-pass rough rolling and 6-pass middle rolling, 4-pass pre-finish rolling and 10-pass finish rolling, wherein the initial rolling temperature is controlled to be 1170-1190 ℃, the surface temperature of rolled pieces in the rolling process is controlled to be 1180-1250 ℃, the rolling speed is 102m/s, and the wire laying temperature is controlled to be 980-1000 ℃;
and (3) adjusting the air quantity of the fans 1-5 on the air cooling line to be 100%, 50% and 50% of rated air quantity, and closing the rest fans, wherein the specification is 5.5mm.
The obtained cord steel wire rod was subjected to inclusion detection, 12 cross sections were taken per furnace, and the size of the inclusion was 6 μm at the maximum.
Example 3
The embodiment provides a steel rolling method for reducing the impurity size of a cord steel plate, which comprises the following specific steps:
the rolled blank is LX92A, the rolling specification is 5.5mm, the preheating section temperature of the heating furnace is controlled to be 1020-1050 ℃, the heating section temperature is controlled to be 1270-1300 ℃, the soaking section temperature is controlled to be 1270-1300 ℃, the air-fuel ratio in the heating stage and the soaking stage is controlled to be 0.50, and the moisture content in the flue gas is less than or equal to 5%; controlling the temperature difference in the length direction of the blank soaking stage to be about 30 ℃;
performing high-line torsion-free rolling by adopting a rolling mill layout of 6-pass rough rolling and 6-pass middle rolling, 4-pass pre-finish rolling and 10-pass finish rolling, wherein the initial rolling temperature is controlled to 1180-1200 ℃, the surface temperature of rolled pieces in the rolling process is controlled to 1200-1300 ℃, the rolling speed is 101m/s, and the wire-laying temperature is controlled to 1000-1020 ℃;
and (3) adjusting the air quantity of the fans 1-5 on the air cooling line to 95%, 90%, 50%, 30% of rated air quantity, and closing the rest fans, wherein the specification is 5.5mm.
The obtained cord steel wire rod was subjected to inclusion detection, 12 cross sections were taken per furnace, and the size of the inclusion was 5 μm at the maximum.
Example 4
The embodiment provides a steel rolling method for reducing the impurity size of a cord steel plate, which comprises the following specific steps:
the rolled blank is LX82A, the rolling specification is 5.5mm, the preheating section temperature of the heating furnace is controlled to 1100-1040 ℃, the heating section temperature is controlled to 1260-1290 ℃, and the soaking section temperature is controlled to 1260-1280 ℃; controlling the air-fuel ratio of the heating stage and the soaking stage to be 0.60, wherein the moisture content in the flue gas is less than or equal to 5%; controlling the temperature difference in the length direction of the blank soaking stage to be about 28 ℃;
performing high-line torsion-free rolling by adopting a rolling mill layout of 6-pass rough rolling and 6-pass middle rolling, 4-pass pre-finish rolling and 10-pass finish rolling, controlling the initial rolling temperature to 1155-1185 ℃, controlling the surface temperature of rolled pieces in the rolling process to 1155-1200 ℃, controlling the rolling speed to 105m/s and controlling the wire laying temperature to 1000-1020 ℃;
and (3) adjusting the air quantity of the fans 1-5 on the air cooling line to 95%, 90%, 50%, 40% of rated air quantity, and closing the rest fans, wherein the specification is 5.5mm.
The obtained cord steel wire rod was subjected to inclusion detection, 12 cross sections were taken per furnace, and the size of the inclusion was 9 μm at the maximum.
Example 5
The embodiment provides a steel rolling method for reducing the impurity size of a cord steel plate, which comprises the following specific steps:
the rolled blank is LX86A, the rolling specification is 5.5mm, the preheating section temperature of the heating furnace is controlled to 1015-1045 ℃, the heating section temperature is controlled to 1265-1295 ℃, the soaking section temperature is controlled to 1260-1290 ℃, the air-fuel ratio in the heating stage and the soaking stage is controlled to be 0.59, and the moisture content in the flue gas is less than or equal to 5%; controlling the temperature difference in the length direction of the blank soaking stage to be about 40 ℃;
performing high-line torsion-free rolling by adopting a rolling mill layout of 6-pass rough rolling and 6-pass middle rolling, 4-pass pre-finish rolling and 10-pass finish rolling, wherein the initial rolling temperature is controlled to 1175-1195 ℃, the surface temperature of rolled pieces in the rolling process is controlled to 1185-1255 ℃, the rolling speed is 102m/s, and the wire laying temperature is controlled to 1000-1020 ℃;
and (3) adjusting the air quantity of the fans 1-5 on the air cooling line to 92%, 90%, 40%, 30% of rated air quantity, and closing the rest fans, wherein the specification is 5.5mm.
The obtained cord steel wire rod was subjected to inclusion detection, 12 cross sections were taken per furnace, and the size of the inclusion was 10 μm at the maximum.
Example 6
The embodiment provides a steel rolling method for reducing the impurity size of a cord steel plate, which comprises the following specific steps:
the rolled blank is LX92A, the rolling specification is 5.5mm, the preheating section temperature of the heating furnace is controlled at 1025-1050 ℃, the heating section temperature is controlled at 1260-1290 ℃, the soaking section temperature is controlled at 1275-1300 ℃, the air-fuel ratio in the heating stage and the soaking stage is controlled at 0.42, and the moisture content in the flue gas is less than or equal to 5%; controlling the temperature difference in the length direction of the blank soaking stage to be about 37 ℃;
performing high-line torsion-free rolling by adopting a rolling mill layout of 6-pass rough rolling and 6-pass middle rolling, 4-pass pre-finish rolling and 10-pass finish rolling, wherein the initial rolling temperature is controlled to 1185-1200 ℃, the surface temperature of a rolled piece in the rolling process is controlled to 1250-1300 ℃, the rolling speed is 101m/s, and the wire laying temperature is controlled to 980-1000 ℃;
and (3) adjusting the air quantity of the fans 1-5 on the air cooling line to be 100%, 60%, 50% of rated air quantity, and closing the rest fans, wherein the specification is 5.5mm.
The obtained cord steel wire rod was subjected to inclusion detection, 12 cross sections were taken per furnace, and the size of the inclusion was 9 μm at the maximum.
Comparative example 1
The comparative example provides a steel rolling method for reducing the impurity size of a cord steel plate, which comprises the following specific steps:
the rolled blank is LX82A, the rolling specification is 5.5mm, the preheating section temperature of the heating furnace is controlled to 900-950 ℃, the heating section temperature is controlled to 980-1060 ℃, the soaking section temperature is controlled to 1010-1150 ℃, the air-fuel ratio of the heating stage and the soaking stage is controlled to 0.65, and the moisture content in the flue gas is less than or equal to 5%; controlling the temperature difference in the length direction of the blank soaking stage to be about 40 ℃;
performing high-line torsion-free rolling by adopting a rolling mill layout of 6-pass rough rolling, 6-pass middle rolling, 4-pass pre-finish rolling and 10-pass finish rolling, wherein the initial rolling temperature is controlled to be 970-1000 ℃, the surface temperature of a rolled piece in the rolling process is 950-1000 ℃, the rolling speed is 110m/s, and the wire-spinning temperature is controlled to be 850-870 ℃;
and (3) adjusting the air quantity of the fans 1-5 on the air cooling line to be 100%, 90% of rated air quantity, and closing the rest fans, wherein the specification is 5.5mm.
The obtained cord steel wire rod was subjected to inclusion detection, 12 cross sections were taken per furnace, and the size of the inclusion was 22 μm at the maximum.
Comparative example 2
The comparative example provides a steel rolling method for reducing the impurity size of a cord steel plate, which comprises the following specific steps:
the rolled blank is LX82A, the rolling specification is 5.5mm, the temperature of a preheating section of a heating furnace is controlled to be 1000-1030 ℃, the temperature of a heating section is controlled to be 1250-1280 ℃, and the temperature of a soaking section is controlled to be 1250-1280 ℃; the air-fuel ratio of the heating stage and the soaking stage is controlled to be 0.62, and the moisture content in the flue gas is less than or equal to 5%; controlling the temperature difference in the length direction of the blank soaking stage to be about 40 ℃;
performing high-line torsion-free rolling by adopting a rolling mill layout of 6-pass rough rolling and 6-pass middle rolling, 4-pass pre-finish rolling and 10-pass finish rolling, controlling the initial rolling temperature to 1150-1180 ℃, controlling the surface temperature of rolled pieces to 1150-1200 ℃ in the rolling process, controlling the rolling speed to 105m/s and controlling the wire-laying temperature to 850-900 ℃;
and (3) adjusting the air quantity of the fans 1-5 on the air cooling line to be 100%, 50% and 50% of rated air quantity, and closing the rest fans, wherein the specification is 5.5mm.
The obtained cord steel wire rod was subjected to inclusion detection, 12 cross sections were taken per furnace, and the size of the inclusion was 18 μm at the maximum.
Comparative example 3
The comparative example provides a steel rolling method for reducing the impurity size of a cord steel plate, which comprises the following specific steps:
the rolled blank is LX82A, the rolling specification is 5.5mm, the preheating section temperature of the heating furnace is controlled to 900-950 ℃, the heating section temperature is controlled to 980-1060 ℃, the soaking section temperature is controlled to 1010-1150 ℃, the air-fuel ratio of the heating stage and the soaking stage is controlled to 0.55, and the moisture content in the flue gas is less than or equal to 5%; controlling the temperature difference in the length direction of the blank soaking stage to be about 40 ℃;
performing high-line torsion-free rolling by adopting a rolling mill layout of 6-pass rough rolling and 6-pass middle rolling, 4-pass pre-finish rolling and 10-pass finish rolling, controlling the initial rolling temperature to 1150-1180 ℃, controlling the surface temperature of rolled pieces in the rolling process to 1150-1200 ℃, controlling the rolling speed to 105m/s and controlling the wire-laying temperature to 980-1000 ℃;
and (3) adjusting the air quantity of the fans 1-5 on the air cooling line to be 100%, 50% and 50% of rated air quantity, and closing the rest fans, wherein the specification is 5.5mm.
The obtained cord steel wire rod was subjected to inclusion detection, 12 cross sections were taken per furnace, and the size of the inclusion was 19 μm at the maximum.
Experimental example
The drawing wire breakage rate is tested, the test method is to roll 5 rolls respectively by adopting the processes of the examples and the comparative examples, and the production test is carried out by customers, and the test results are shown in the following table:
TABLE 1
| Sample of | Drawing wire breakage rate | Sample of | Drawing wire breakage rate |
| Example 1 | 1.2 times/ton | Example 6 | 1.3 times/ton |
| Example 2 | 1.3 times/ton | Comparative example 1 | 3.2 times/ton |
| Example 3 | 1.5 times/ton | Comparative example 2 | 2.8 times/ton |
| Example 4 | 1.2 times/ton | Comparative example 3 | 3.5 times/ton |
| Example 5 | 1.2 times/ton |
According to the test results, the rolling method provided by the invention can effectively reduce the size of inclusions in the cord steel wire rod in the rolling process, and the prepared cord steel wire rod inclusions have the characteristics of small size, easiness in deformation and the like, so that the drawing breakage rate of the cord steel caused by inclusions is obviously reduced.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. A method of rolling steel to reduce the size of cord steel coil inclusions comprising the steps of:
blank preparation: the blank is low-melting-point inclusion cord steel;
and (3) heat treatment: the method comprises the steps of preheating, heating and soaking, wherein the temperature of the preheating stage is 1000-1050 ℃, the temperature of the heating stage is 1250-1300 ℃, and the temperature of the soaking stage is 1250-1300 ℃;
rolling treatment: the initial rolling temperature is 1150-1200 ℃, the surface temperature of rolled pieces is 1150-1300 ℃, the final rolling speed is more than or equal to 100m/s, and the spinning temperature is 980-1020 ℃;
and (3) cooling treatment: the cooling rate is 10-20 ℃/s; in the cooling treatment step, when the room temperature is more than 20 ℃, the number 1-3 fan is set to be 100% of rated air quantity, and the number 4-5 fan is set to be 40-60% of rated air quantity;
when the room temperature is less than or equal to 20 ℃, the number 1-3 fan is set to 90-95% of rated air quantity, and the number 4-5 fan is set to 30-50% of rated air quantity.
2. The method for reducing the impurity size of a steel cord rod according to claim 1, wherein the air-fuel ratio in the heating stage and the soaking stage is not more than 0.6, and the moisture content in the flue gas is not more than 5%.
3. A steel rolling method for reducing the impurity size of a steel cord rod according to claim 2, wherein the air-fuel ratio of the heating stage and the soaking stage is 0.4 to 0.6.
4. The method of claim 1, wherein the temperature difference in the length direction of the blank soaking stage is equal to or less than 40 ℃.
5. A method of rolling steel to reduce the impurity size of a steel cord strip according to claim 1, characterized in that said finishing rate is 100-110m/s.
6. A method of rolling steel to reduce the size of cord steel coil inclusions as in claim 1, wherein the laying temperature is controlled to 980-1000 ℃ at room temperature > 20 ℃;
when the room temperature is less than or equal to 20 ℃, the laying temperature is controlled to be 1000-1020 ℃.
7. The method of reducing the impurity size of a steel cord rod according to claim 4, wherein said temperature difference in the length direction is 20-40 ℃ when said billet is heated.
8. A steel rolling method for reducing the impurity size of a cord steel strip according to any one of claims 1 to 7, characterized in that said low melting point inclusion cord steel means a cord steel having an inclusion melting point of 1200 ℃ or less.
9. The method of reducing the impurity size of a steel cord rod according to claim 8, wherein said low melting point inclusion cord steel is LX72A, LX82A, LX86A, LX92A or LX96A.
10. A cord steel wire rod prepared by the steel rolling method of any one of claims 1 to 9.
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