CN112496062B - Method for improving performance uniformity of high-carbon steel wire rod in same circle - Google Patents
Method for improving performance uniformity of high-carbon steel wire rod in same circle Download PDFInfo
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Abstract
The invention aims to provide a method for improving the performance uniformity of the same circle of a high-carbon steel wire rod. Meanwhile, the controlled cooling process is optimized, and the space between two adjacent coils of wire rods and the cooling speed are controlled in a segmented manner, so that the overall strength of the wire rods is improved. The high-carbon steel wire rod produced by the method has the transverse temperature fluctuation of less than 20 ℃, the same-circle strength fluctuation of less than 40MPa, the minimum strength value of more than 20MPa, the sorbite proportion of more than or equal to 80 percent, no bainite, martensite and other abnormal structures, and the wire breaking rate of drawing of customers is less than or equal to 0.3 times per ton.
Description
Technical Field
The invention belongs to the technical field of steel rolling production, and particularly relates to a method for improving performance uniformity of a same ring of a high-carbon steel wire rod.
Background
The high-carbon steel wire rod is a main raw material for producing prestressed steel strands and steel wire ropes, and the stability of the product performance is important to the production process of downstream customers and the stability of the performance of finished products. The tensile strength of the wire rod is large in fluctuation, so that the stress state of the die and the load of the wire drawing machine are in an unstable state in the drawing process of the wire rod, the die loss is large, the wire drawing breakage rate is increased, and the production efficiency and the steel wire quality are affected. In addition, the steel wires are slipped and the tensile stress is unstable due to different strength of each steel wire in the pre-tensioning process, and the hidden harm is generated to the pre-stressed member. Therefore, it is important to reduce the fluctuation in the strength of the high-carbon steel wire rod.
In the transportation process of the hot-rolled wire rod on the stelmor roller way, due to different stacking densities at different transverse positions, under the condition of the same air volume, the phase change time points and the phase change cooling speed at different positions are different, and finally the phase change organization is different, so that the wire rod has larger performance fluctuation at the same circle. A 'Jialing device' is used below a Stelmo roller way at home and abroad for adjusting the air volume distribution of the lap joint area and the non-lap joint area, wherein the lap joint areas at two sides respectively account for 1/4 of the coil diameter D of the wire rod. However, through accurate analysis of transverse cooling conditions of the wire rod in the actual production process, for the wire rod within the 1/6D area of the end part of the lap joint point, the bulk density is between the lap joint point and the non-lap joint point, the air volume of the area is larger by the area of the lap joint point, the bulk density is not matched with the air volume, a local forced cooling area is easily formed at the area, the transverse temperature fluctuation is larger, the temperature difference can reach more than 60 ℃, and further the performance fluctuation of the same coil of the wire rod is larger. Especially for high carbon steel with high Cr content, the performance fluctuation phenomenon in the same circle is more obvious due to high cooling strength, and can not be completely eliminated only by a Jialing device.
Disclosure of Invention
The invention aims to provide a method for improving performance uniformity of a same circle of a high-carbon steel wire rod. Meanwhile, the air quantity of the fan and the speed of the roller way are optimized, and the space between two adjacent coils of wire rods and the cooling speed are controlled in a segmented manner, so that the overall strength of the wire rods is improved. The high-carbon steel wire rod produced by the method has the transverse temperature fluctuation of less than 20 ℃, the same-circle strength fluctuation of less than 40MPa, the minimum strength value improved by more than 20MPa, no abnormal structures such as bainite, martensite and the like, and the wire breaking rate of drawing by customers is less than or equal to 0.3 times per ton.
In order to realize the purpose, the invention adopts the following technical scheme:
the method for improving the performance uniformity of the same coil of the high-carbon steel wire rod is characterized in that the wire rod contains 0.70-0.84% of C by mass and 0.33-0.38% of Cr by mass, the wire rod is cooled on a stelmor air cooling line after spinning, the transverse cooling uniformity is adjusted by adding a wind shield device on the stelmor, the transverse temperature difference is less than 20 ℃, the interval between two adjacent coils of the wire rod and the cooling speed are controlled in a segmented mode, and the overall strength of the wire rod is improved while the performance fluctuation of the same coil is reduced. Wherein:
the spinning temperature is 880-900 ℃, and the space S between two adjacent coils of wire rod after spinningi＝DπViV, unit m;
wherein D is the coil diameter of the wire rod and the unit m; viThe roller speed is in m/s; v is the final rolling speed of the wire rod in m/s; the following relationship is satisfied:
when the cooling temperature is 600-900 ℃, S is 0.11-0.16 m, and the cooling speed is 11-13 ℃/S; when the cooling temperature is 550-600 ℃, the S is 0.06-0.12 m, and the cooling speed is 1.1-2.3 ℃/S;
in order to meet the requirement of high strength of the export wire rod with the carbon content of 0.70-0.84%, 0.33-0.38% of Cr element is added into the components for strengthening, the hardenability of the wire rod is greatly improved by the increase of Cr, the pearlite transformation range is narrowed, meanwhile, Ms and Mf points of steel are reduced in the phase transformation process, and when the undercooled austenite is subjected to phase transformation at a lower temperature and a higher cooling speed, martensite or bainite and other abnormal structures which are not beneficial to deformation are easily generated. The existence of martensite and bainite leads the strength of the wire to be high and the toughness to be poor, thus causing the wire breakage rate of a user to be increased in the drawing process, greatly increasing the production cost and reducing the production efficiency, therefore, the phase transformation process needs to be accurately controlled, the non-uniformity of the same-circle structure is reduced, and the generation of abnormal structures is avoided.
The spinning temperature is set to be 880-900 ℃, a proper austenite grain size can be obtained, and hardenability in a phase change process and supercooling degree during phase change are enhanced, so that the tensile strength of the wire rod is improved. According to the invention, the distance between two adjacent coils of wire rods is set according to the wire rod rolling speed and the roller way speed, and the matching of the finish rolling speed and the roller way speed can ensure that the wire rods have better ring shapes, so that the formation of reverse insertion is avoided. In addition, the position of the lap joint point of the wire rods is constantly changed by changing the distance between two adjacent coils of the wire rods, so that the transverse cooling gradient of the wire rods is reduced, the phase change time and the supercooling degree of each position tend to be consistent, and the performance is uniform.
When the cooling temperature is 600-900 ℃, the wire rod is not subjected to phase change, the space S between two adjacent coils of the wire rod is controlled to be 0.11-0.16 m, the cooling speed of the wire rod is 11-13 ℃/S, under the process parameters, the wire rod can be cooled to the phase change temperature in the shortest time, the maximum supercooling degree is obtained, and the tensile strength of the wire rod is favorably improved;
when the cooling temperature is 550-600 ℃, controlling the space S between two adjacent coils of wire rods to be 0.06-0.12 m, and the cooling speed to be 1.1-2.3 ℃/S; in the temperature range, the lap joint point and the non-lap joint point of the wire rod are all positioned in the pearlite transformation range, and the lower the temperature is, the finer the lamella spacing is, and the higher the strength of the wire rod is. The lowest temperature is more than or equal to 550 ℃, the formation of low-temperature bainite and martensite is avoided, the highest temperature is less than or equal to 600 ℃, the temperature is close to the nose tip temperature of pearlite transformation, and the acceleration of the pearlite transformation is facilitated. The wire rod is cooled at the speed of 1.1-2.3 ℃/s, the retention time of a pearlite phase transformation interval can be prolonged, the sufficient phase transformation is ensured, and the residual austenite is prevented from being transformed into low-temperature bainite and martensite.
Furthermore, in the method for improving the performance uniformity of the high-carbon steel same ring, the wind baffles are arranged at two sides of the outlet of the air channel and positioned at 1/6D-2/6D inside the lap joint, and the installation direction is vertical to the outlet of the air channel.
By tracking the production process of the wire rod, for the specification of 9-13 mm, the stacking density of the overlapping point side part 1/6D range and the stacking density of the inner side 2/6D range are obviously different, as shown in figure 1. The stacking density in the range of 2/6D in the inner part is between the lap joint point and the non-lap joint point, and the air volume is greatly influenced by the edge part, so that the stacking density at the position is not matched with the air volume, a local strong cooling area is easily formed, the transverse temperature fluctuation is larger and can reach more than 60 ℃, bainite or martensite structures are easily generated in the strong cooling area in the phase change process, and the performance fluctuation of the same coil of the wire rod is larger. By adding the wind shield device at the junction of the inner side 1/6D and the 2/6D of the lap joint point, the influence of the air quantity at the lap joint point on the inner side 2/6D area can be effectively reduced, the cooling strength at the position is reduced, and the transverse temperature fluctuation of the wire rod is reduced to be within 20 ℃.
Further, in the method for improving the performance uniformity of the high-carbon steel same-circle roller bed, the wind shield plates are arranged on the outlets of odd-numbered exhaust ducts of 4-40 m roller beds and fixed in a spot welding mode, the width L1 above the outlets of the air ducts is 16cm, the angle alpha of the contact positions of the wind shield plates and the outlets of the air ducts is 45 degrees, the width L2 below the wind shield plates is 10cm, the height H is 30cm, and the thickness B is 0.5 cm.
Install the deep bead on the odd number exhaust airway export of 4 ~ 40m roll table, install from first platform fan top, end to 4 th section roll table, the wire rod has not carried out the phase transition yet, one row of increase deep bead in interval, both the inboard amount of wind of reducible overlap joint, can guarantee again that this region has sufficient cooling strength, make the wire rod bulk density and cooling strength phase-match everywhere on horizontal, thereby reduce the time and the temperature difference that the phase transition took place for each point, be favorable to the temperature and the cold speed control of later stage phase transition section, avoid the production of local abnormal tissue, improve wire rod tissue homogeneity.
The width L1 above the air duct outlet is 16cm, so that the width of the air baffle is larger than that of the air duct outlet, the air baffle can be lapped on the air duct outlet, and the placement stability of the air baffle is improved; the width L2 of the wind shield below the air duct outlet is 10cm, the height H is 30cm, and the width is consistent with the width of the air opening, so that transverse incoming air at two sides can be effectively blocked, and the influence of the air quantity at the edge of the lap joint on the inner 2/6D area is reduced; the thickness B of the wind shield is 0.5cm, so that the wind shield has enough strength, the weight of the wind shield can be reduced, and the wind shield can be firmly installed on the outlet of the air duct through spot welding.
Compared with the prior art, the invention has the advantages that at least the following two aspects are presented:
1. the deep bead device that adds on the wind channel export has compensatied good spirit device not enough to horizontal air regulation, can carry out the accuracy to local amount of wind distribution and regulate and control, and this device processing is simple, simple to operate, and is with low costs to the equipment transformation, and is showing to the horizontal temperature homogeneity improvement effect of wire rod, can reduce to <20 ℃ from >60 ℃ with horizontal temperature fluctuation.
2. The high-carbon steel wire rod produced by the method has the same-circle tensile strength fluctuation of less than 40MPa, the lowest strength value can be improved by more than 20MPa, the sorbite proportion is more than or equal to 80 percent, no abnormal structures such as bainite, martensite and the like exist, the wire breakage rate is less than 0.3 times per ton, the wire drawing cost is greatly reduced, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus for improving the performance uniformity of the same coil of the high-carbon steel wire rod according to the present invention;
FIG. 2 is a cross-sectional temperature profile of a wire rod according to an embodiment of the present invention;
FIG. 3 is a cross-directional temperature profile of a comparative example wire rod of the present invention;
FIG. 4 is a metallographic structure drawing of a wire rod at a position 2/6D inside a lap joint according to an embodiment of the invention;
FIG. 5 is a metallographic representation of a wire rod at a location 2/6D inboard of the lap joint of the comparative example of the present invention;
FIG. 6 is a graph of a transverse cooling zone profile for a Stelmor section of the present invention;
FIG. 7 is a schematic view of a wind deflector according to the present invention;
wherein: 1-air outlet; 2-roller bed; 3-wind guard
Figure 8 strength profiles of the wire rods of the examples of the invention and the comparative examples.
Detailed Description
The technical solution of the present invention is further described with reference to the following specific embodiments. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The method is implemented in a high-carbon steel wire rod with the thickness of 11mm, and the internal control tensile strength is more than or equal to 1050 MPa. The wire rod comprises 0.72% of C by mass and 0.36% of Cr by mass, the wire rod is cooled on a stelmor air cooling line after spinning, a wind shield device is additionally arranged on the stelmor to adjust the transverse cooling uniformity, the wind shields are arranged on the outlets of odd exhaust ducts of 4-40 m roller ways and are positioned at 0.21m positions on the inner side of a lap joint point, the wind shields are respectively arranged on the left and the right, and the mounting direction of the wind shields is vertical to the outlets of the air ducts.
And controlling the space between two adjacent coils of wire rods and the cooling speed in a segmented manner, wherein:the spinning temperature is 889 ℃, and the space S between two adjacent coils of wire rods after spinningi＝DπViV, unit m; controlling the final rolling speed V to be 58m/S, the diameter D of the ring after spinning to be 1.28m, and SiThe settings are shown in table 1.
The temperature is measured by a thermal infrared imager, the transverse temperature distribution of the wire rod at a certain position on the stelmor roller way is shown in figure 2, and the transverse temperature difference is 18 ℃. According to the calculation of the temperature measurement curve, the cooling speed of each transverse position of the wire rod is the same, and when the temperature is 600 ℃ and is less than 889 ℃, the average cooling speed is 12.5 ℃/s; when 550 ℃ < temperature <600 ℃, the average cooling rate is 2.1 ℃/s.
And (3) carrying out performance uniformity inspection on a whole circle of wire rod, averagely shearing 10 equal-length samples, respectively detecting metallographic structures and mechanical properties of each sample, sequentially marking the samples by 1-1 and 1-2 … 1-10, wherein the metallographic structures at the positions 1/6D inside the lap joint are shown in a figure 4, and the tensile strength of the same circle is shown in a table 2.
Example 2
The method is implemented in a 12mm high-carbon steel wire rod, and the internal control tensile strength is more than or equal to 1100 MPa. The wire rod comprises 0.76% of C by mass and 0.35% of Cr by mass, the wire rod is cooled on a stelmor air cooling line after being spun, a wind shield device is additionally arranged on the stelmor to adjust the transverse cooling uniformity, wind shields are arranged on the outlets of odd number exhaust ducts of 4-40 m roller ways and are positioned at 0.23m positions on the inner side of a lap joint, the wind shields are respectively arranged on the left and the right, and the mounting direction of the wind shields is vertical to the outlets of the air ducts.
And performing sectional control on the space between two adjacent coils of wire rods and the cooling speed, wherein: the spinning temperature is 884 ℃, and the space S between two adjacent coils of wire rods after spinningi＝DπViV, unit m; the final rolling speed V is controlled to be 46m/S, the diameter D of the ring after spinning is controlled to be 1.35m, and SiThe settings are shown in table 1.
The temperature is measured by a thermal infrared imager, and the maximum transverse temperature difference of the wire rod on the stelmor roller way is 16 ℃. According to the calculation of the temperature measurement curve, the cooling speed of each transverse position of the wire rod is the same, and when the temperature is 600 ℃ and is less than 884 ℃, the average cooling speed is 12.1 ℃/s; when 550 ℃ < temperature <600 ℃, the average cooling rate is 1.8 ℃/s.
Taking a whole circle of wire rod to carry out performance uniformity test, averagely shearing 10 equal-length samples, respectively detecting metallographic structures and mechanical properties of each sample, sequentially marking the samples with the numbers of 1-1 and 1-2 … 1-10, and showing the tensile strength of the same circle as that of table 2.
Example 3
The method is implemented in a high-carbon steel wire rod with the thickness of 12.5mm, and the internal control tensile strength is more than or equal to 1150 MPa. The wire rod comprises 0.81% of C by mass and 0.37% of Cr by mass, the wire rod is cooled on a stelmor air cooling line after being spun, a wind shield device is additionally arranged on the stelmor to adjust the transverse cooling uniformity, wind shields are arranged on the outlets of odd number exhaust ducts of 4-40 m roller ways and are positioned at 0.21m positions on the inner side of a lap joint, the wind shields are respectively arranged on the left and the right, and the mounting direction of the wind shields is vertical to the outlets of the air ducts.
And controlling the space between two adjacent coils of wire rods and the cooling speed in a segmented manner, wherein: the spinning temperature is 897 ℃, and the space S between two adjacent coils of wire rod after spinningi＝DπViV, unit m; controlling the final rolling speed V to be 42m/S, the diameter D of the ring after spinning to be 1.30m, and SiThe settings are shown in table 1.
The temperature is measured by a thermal infrared imager, and the maximum transverse temperature difference of the wire rod on the stelmor roller way is 17 ℃. According to the calculation of the temperature measurement curve, the cooling speed of each transverse position of the wire rod is the same, and when the temperature is 600 ℃ and is less than 897 ℃, the average cooling speed is 11.9 ℃/s; when 550 ℃ < temperature <600 ℃, the average cooling rate is 1.6 ℃/s.
Taking a whole circle of wire rod to carry out performance uniformity test, averagely shearing 10 equal-length samples, respectively detecting metallographic structure and mechanical property of each sample, sequentially marking 1-1, 1-2 … 1-10 according to the sequence, and showing the tensile strength of the same circle as shown in Table 2.
Example 4
The method is implemented in a 13mm high-carbon steel wire rod, and the internal control tensile strength is more than or equal to 1150 MPa. The wire rod comprises 0.83 mass percent of C and 0.38 mass percent of Cr, the wire rod is cooled on a stelmor air cooling line after spinning, a wind shield device is additionally arranged on the stelmor to adjust the transverse cooling uniformity, the wind shields are arranged on the outlets of odd exhaust ducts of 4-40 m roller ways and are positioned at 0.22m positions on the inner side of a lap joint point, the wind shields are respectively arranged on the left and the right, and the mounting direction is vertical to the outlets of the air ducts.
And controlling the space between two adjacent coils of wire rods and the cooling speed in a segmented manner, wherein: the spinning temperature is 892 ℃, and the space S between two adjacent coils of wire rods after spinningi＝DπViV, unit m; controlling the final rolling speed V to be 36m/S, the diameter D of the ring after spinning to be 1.32m, and SiThe settings are shown in table 1.
The temperature is measured by a thermal infrared imager, and the maximum transverse temperature difference of the wire rod on the stelmor roller way is 15 ℃. According to the calculation of the temperature measurement curve, the cooling speed of each transverse position of the wire rod is the same, and when the temperature is 600 ℃ and is lower than 892 ℃, the average cooling speed is 11.5 ℃/s; when 550 ℃ < temperature <600 ℃, the average cooling rate is 1.9 ℃/s.
Taking a whole circle of wire rod to carry out performance uniformity test, averagely shearing 10 equal-length samples, respectively detecting metallographic structures and mechanical properties of each sample, sequentially marking the samples with the numbers of 1-1 and 1-2 … 1-10, and showing the tensile strength of the same circle as that of table 2.
Comparative example 1
The method is implemented in a high-carbon steel wire rod with the thickness of 11mm, and the internal control tensile strength is more than or equal to 1050 MPa. The wire rod comprises 0.73 mass percent of C and 0.35 mass percent of Cr, and the wire rod is cooled on a stelmor air cooling line after spinning.
And controlling the space between two adjacent coils of wire rods and the cooling speed in a segmented manner, wherein: the spinning temperature is 875 ℃, and the distance between two adjacent coils of wire rod after spinning is Si＝DπViV, unit mm; controlling the final rolling speed V to be 58m/S, the diameter D of the ring after spinning to be 1.28m, and SiThe settings are shown in table 1.
The temperature is measured by a thermal infrared imager, the transverse temperature distribution of the wire rod at a certain position on the stelmor roller way is shown in figure 3, and the transverse temperature difference is 62 ℃. According to the calculation of the temperature measurement curve, when the temperature is 600 ℃ and <875 ℃, the average cooling speed at 2/6D inside the lap joint point is 14.6 ℃/s, and the average cooling speed at the rest positions is 11.8 ℃/s; when 550 ℃ < temperature <610 ℃, the average cooling rate was 3.2 ℃/s at 2/6D inside the lap point, and 1.7 ℃/s at the rest of the positions.
And (3) carrying out performance uniformity inspection on a whole circle of wire rod, averagely shearing 10 equal-length samples, respectively detecting metallographic structures and mechanical properties of each sample, sequentially marking the samples by 1-1 and 1-2 … 1-10, wherein the metallographic structures at the positions 1/6D inside the lap joint are shown in a figure 5, and the tensile strength of the same circle is shown in a table 2.
Comparative example 2
The method is implemented in a 12mm high-carbon steel wire rod, and the internal control tensile strength is more than or equal to 1100 MPa. The wire rod contains 0.77% of C and 0.36% of Cr by mass, and the wire rod is cooled on a stelmor air cooling line after spinning.
And controlling the space between two adjacent coils of wire rods and the cooling speed in a segmented manner, wherein: the spinning temperature is 882 ℃, and the space S between two adjacent coils of wire rod after spinningi＝DπViV, unit m; controlling the final rolling speed V to be 46m/S, the diameter D of the ring after spinning to be 1.35m, and SiThe settings are shown in table 1.
The temperature is measured by a thermal infrared imager, and the maximum transverse temperature difference is 71 ℃. According to the calculation of the temperature measurement curve, when the temperature is 600 ℃ and less than 882 ℃, the average cooling speed at 2/6D inside the lap joint point is 13.7 ℃/s, and the average cooling speed at the rest positions is 11.5 ℃/s; when 550 ℃ < temperature <600 ℃, the average cooling rate is 2.9 ℃/s at 2/6D inside the lap point, and 1.6 ℃/s at the rest of the positions.
Taking a whole circle of wire rod to carry out performance uniformity test, averagely shearing 10 equal-length samples, respectively detecting metallographic structures and mechanical properties of each sample, sequentially marking the samples with the numbers of 1-1 and 1-2 … 1-10, and showing the tensile strength of the same circle as that of table 2.
Comparative example 3
The method is implemented in a high-carbon steel wire rod with the thickness of 12.5mm, and the internal control tensile strength is more than or equal to 1150 MPa. The wire rod comprises 0.82 mass percent of C and 0.38 mass percent of Cr, and the wire rod is cooled on a stelmor air cooling line after spinning.
And controlling the space between two adjacent coils of wire rods and the cooling speed in a segmented manner, wherein: the spinning temperature is 885 ℃, and the space S between two adjacent coils of wire rods after spinningi＝DπViV, unit m; controlling the final rolling speed V to be 42m/S, the diameter D of the ring after spinning to be 1.30m, and SiThe settings are shown in table 1.
The measurement is carried out by adopting a thermal infrared imager, and the maximum transverse temperature difference is 69 ℃. When the temperature is 600 ℃ and <890 ℃, the average cooling speed at 2/6D at the inner side of the lap joint point is 14.2 ℃/s, and the cooling speed at the rest positions is 11.9 ℃/s; when 550 ℃ < temperature <610 ℃, the average cooling rate at 2/6D inside the lap point was 2.8 ℃/s, and the cooling rate at the rest of the positions was 1.8 ℃/s.
Taking a whole circle of wire rod to carry out performance uniformity test, averagely shearing 10 equal-length samples, respectively detecting metallographic structures and mechanical properties of each sample, sequentially marking the samples with the numbers of 1-1 and 1-2 … 1-10, and showing the tensile strength of the same circle as that of table 2.
Comparative example 4
The method is implemented in a 13mm high-carbon steel wire rod, and the internal control tensile strength is more than or equal to 1150 MPa. The wire rod comprises 0.84% of C and 0.36% of Cr by mass, and the wire rod is cooled on a stelmor air cooling line after spinning.
And controlling the space between two adjacent coils of wire rods and the cooling speed in a segmented manner, wherein: the spinning temperature is 879 ℃, and the space S between two adjacent coils of wire rod after spinningi＝DπViV, unit m; controlling the final rolling speed V to be 36m/S, the diameter D of the ring after spinning to be 1.32m, and SiThe settings are shown in table 1.
The measurement is carried out by adopting a thermal infrared imager, and the maximum transverse temperature difference is 85 ℃. When the temperature is 600 ℃ and <890 ℃, the average cooling speed at 2/6D at the inner side of the lap joint point is 13.9 ℃/s, and the cooling speed at the rest positions is 11.5 ℃/s; when 550 ℃ < temperature <610 ℃, the average cooling rate was 3.2 ℃/s at 2/6D inside the lap point, and the cooling rate was 2.1 ℃/s at the rest of the positions.
Taking a whole circle of wire rod to carry out performance uniformity test, averagely shearing 10 equal-length samples, respectively detecting metallographic structures and mechanical properties of each sample, sequentially marking the samples with the numbers of 1-1 and 1-2 … 1-10, and showing the tensile strength of the same circle as that of table 2.
TABLE 1 setting/m of space S between two adjacent coils of wire rod in each section of roller way of examples and comparative examples
| |
1 |
2 |
3 stages | 4 stages | 5 paragraph | 6 paragraphs of | 7 paragraph | 8 paragraph | 9 |
10 paragraph | Outlet section | |
| Example 1 | 0.08 | 0.09 | 0.10 | 0.11 | 0.11 | 0.12 | 0.11 | 0.10 | 0.08 | 0.06 | 0.06 | 0.07 |
| Example 2 | 0.11 | 0.11 | 0.12 | 0.14 | 0.14 | 0.14 | 0.14 | 0.13 | 0.10 | 0.08 | 0.07 | 0.09 |
| Example 3 | 0.11 | 0.11 | 0.12 | 0.13 | 0.14 | 0.14 | 0.12 | 0.12 | 0.10 | 0.09 | 0.07 | 0.08 |
| Example 4 | 0.12 | 0.13 | 0.14 | 0.15 | 0.16 | 0.16 | 0.13 | 0.13 | 0.11 | 0.10 | 0.09 | 0.09 |
| Comparative example 1 | 0.08 | 0.09 | 0.09 | 0.10 | 0.10 | 0.11 | 0.10 | 0.09 | 0.07 | 0.06 | 0.06 | 0.07 |
| Comparative example 2 | 0.11 | 0.11 | 0.12 | 0.13 | 0.13 | 0.14 | 0.13 | 0.12 | 0.11 | 0.09 | 0.08 | 0.09 |
| Comparative example 3 | 0.11 | 0.11 | 0.12 | 0.13 | 0.14 | 0.14 | 0.12 | 0.12 | 0.10 | 0.09 | 0.07 | 0.08 |
| Comparative example 4 | 0.12 | 0.13 | 0.14 | 0.15 | 0.16 | 0.16 | 0.13 | 0.13 | 0.11 | 0.10 | 0.09 | 0.09 |
TABLE 2 results of tensile strength measurements/MPa of the same circle of examples and comparative examples
In the examples, the structures of the same rings are pearlite structures, the sorbite proportion is more than 80%, abnormal structures such as bainite and martensite are not generated, the structures at 2/6D inside the lap joint of the comparative example are pearlite, bainite and a small amount of martensite, and the structures at the rest positions are normal. The distribution range of the tensile strength of the comparative example and the example is shown in fig. 8, and the comparison shows that the strength of the comparative wire rod of the example is improved by more than 20MPa compared with the minimum value of the strength of the comparative wire rod, the strength fluctuation of the same circle of the example is less than 40MPa, and the performance uniformity of the same circle is greatly improved.
After trial and tracking of customers, the yarn breakage rates of the examples 1, 2, 3 and 4 are respectively 0.3, 0.1, 0.2 and 0.1 times/ton and are respectively lower than the yarn breakage rates of the comparative examples 1, 2, 3 and 4, namely 1.3, 2.1, 3.4 and 2.6 times/ton, the production efficiency is greatly improved, and the production cost caused by yarn breakage is greatly reduced.
The above-mentioned examples only express the specific embodiments of the present invention, but should not be construed as limiting the scope of the present invention. Any modifications of the present invention which would occur to one skilled in the art and having the benefit of this disclosure are intended to be included within the scope of the present invention.
Claims (2)
1. The method for improving the performance uniformity of the high-carbon steel wire rod in the same circle is characterized in that the wire rod comprises the following components in percentage by mass: 0.70-0.84%, Cr: 0.33-0.38%, the wire rod spinning temperature is 880-900 ℃, cooling is carried out on a stelmor air cooling line after spinning, wind shield devices are additionally arranged on the stelmor, the wind shields are arranged on two sides of an air duct outlet and positioned at 1/6D inside a lap joint point, the mounting direction is vertical to the air duct outlet, and the transverse temperature difference of the wire rod<The space between two adjacent coils and the cooling speed are controlled in a segmented way at the temperature of 20 ℃, and the space S between two adjacent coilsi=DπViV, S at a cooling temperature of 600 < 900 DEG Ci= 0.11-0.16 m, and the average cooling speed is 11-13 ℃/s; when the cooling temperature is more than 550 and less than 600 ℃, Si= 0.06-0.12 m, and the average cooling speed is 1.1-2.3 ℃/s; wherein, the space S between the coiled stripsiThe unit is m; d is the coil diameter of the wire rod and the unit m; viThe roller speed is in m/s; v is the final rolling speed of the wire rod in m/s.
2. The method for improving the performance uniformity of the same coil of the high-carbon steel wire rod according to claim 1, wherein the wind shield is installed at an outlet of an odd number of exhaust ducts of a 4-40 m roller bed and fixed by spot welding, the width L1 above the outlet of the air ducts is 16cm, the angle alpha of the contact position of the wind shield and the outlet of the air ducts is 45 degrees, the width L2 below the wind shield is 10cm, the height H is 30cm, and the thickness B is 0.5 cm.
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| CN113695386B (en) * | 2021-07-06 | 2023-06-20 | 广西柳钢华创科技研发有限公司 | HRB400E high-speed wire rod threaded steel with same-circle strength fluctuation not greater than 20Mpa and production method thereof |
| CN115652178B (en) * | 2021-07-06 | 2023-07-14 | 广西柳钢华创科技研发有限公司 | High-speed wire rod screw steel with small same-circle strength fluctuation difference and surface oxide scale thickness of more than 10 mu m |
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