CN112157121A - Preparation method of 30MnSi hot-rolled wire rod - Google Patents
Preparation method of 30MnSi hot-rolled wire rod Download PDFInfo
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- CN112157121A CN112157121A CN202011024393.1A CN202011024393A CN112157121A CN 112157121 A CN112157121 A CN 112157121A CN 202011024393 A CN202011024393 A CN 202011024393A CN 112157121 A CN112157121 A CN 112157121A
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- 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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B2045/0212—Cooling devices, e.g. using gaseous coolants using gaseous coolants
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- 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 preparation method of a 30MnSi hot-rolled wire rod. The invention aims to solve the technical problem of providing a preparation method which can enable a 30MnSi hot-rolled wire rod to have small intensity fluctuation, good plasticity and uniform structure performance. The method comprises the following steps: a. heating, rolling and spinning a 30MnSi billet to obtain a wire rod; b. cooling the wire rod after spinning by adopting stelmor air cooling control, collecting coils and packaging to obtain the wire rod; the stelmor air cooling adopts an air cooling roller way delayed slow cooling mode, and the speed of the air cooling roller way is controlled to be less than or equal to 0.34 m/s. The 30MnSi hot-rolled wire rod prepared by the method has the tensile strength of 680-700 MPa, the range difference of less than or equal to 20MPa, the tensile strength difference of the same ring of less than or equal to 10MPa, the elongation after fracture of more than or equal to 25 percent and the reduction of area of more than or equal to 50 percent.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a preparation method of a 30MnSi hot-rolled wire rod.
Background
The 30MnSi hot-rolled wire rod is one of the most common products for manufacturing prestressed concrete steel rods, and after the wire rod is subjected to the working procedures of drawing, nicking, heat treatment and the like, the wire rod is widely applied to large-scale projects such as high-rise civil buildings, ports, water conservancy and the like due to the advantages of good obdurability matching, low looseness, weldability, strong bond capacity with concrete and the like.
Since the 30MnSi hot rolled wire rod needs to be drawn, it is required to have proper strength and good plasticity and good drawing property in order to ensure good drawing property and stability. The tensile strength of the alloy is required to be 670-700 MPa by general users, too high strength easily causes drawing difficulty, large die loss is caused, and too low strength causes insufficient performance of a finished product; the elongation after breakage is required to be more than or equal to 25 percent, the reduction of area is required to be more than or equal to 40 percent so as to meet the drawing requirement, and if the plasticity is too low, the fracture is easily caused in the drawing process. Therefore, higher requirements are put on the cooling process after the wire rod is rolled.
In the prior art, slow cooling measures are usually taken after rolling to reduce the strength of the wire rod and improve the plasticity of the wire rod.
In the 'production practice of 30MnSi hot-rolled smooth disk strips for PC steel bars, published in the 32 nd volume, 5 th of Sichuan metallurgy', in 10 months 2010, by Jiang Chichuan, Liujun, Liyi et al, it is disclosed that in the air cooling line slow cooling step, all fans are turned off, 1 section and 11 sections of the heat preservation cover are turned on, and 2-10 sections are all turned off; the technical measures of delayed cooling control after rolling are disclosed in ' development and application of 30MnSi hot rolled wire rod ' published in southern metals ' total 149 by Juebiping, Li ShaoJun, Li academic Engineers and the like in 2006, 4 months.
However, in the actual production process, due to the influence of the fluctuation of chemical components, spinning temperature and the like, and the problems of boundary lapping and non-boundary lapping (the stacking density of the boundary lapping part is high, the cooling speed is low, the stacking density of the non-boundary lapping part is low, the cooling speed is high, and the difference between the temperature of the boundary lapping point and the temperature of the non-boundary lapping point is over 100 ℃ under the natural cooling condition through a tester), the speed of the roller way is matched and the like of the wire rod on the roller way after spinning, the performance fluctuation of the tail part and the same circle of the boundary lapping point and the non-boundary point in the same batch and the same reel head is large.
In the literature, the Rm of the production practice of the 30MnSi hot-rolled polished circular disk strip for the PC steel bar is 695-725 MPa (the range difference is 30 MPa); the Rm of the document 'development and application of 30MnSi hot rolled wire rod' is 720-780 MPa, the range difference is 60MPa, and the Rm difference of the same circle reaches 50 MPa. It can be seen from the above documents that too high a strength and large fluctuation are common problems in the production of 30 MnSi.
Patent document CN109201756A discloses a "rolling and cooling control method for a 30MnSi steel bar for construction", which discloses a method capable of promoting the wire to form a pearlite structure and effectively adjusting the effect of mechanical properties thereof, and only the heating temperature, the spinning temperature, the roller speed, the fan opening degree and the opening of the heat-insulating cover are explained, but the control target and the actual control situation of the mechanical properties are not explained.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method which can enable a 30MnSi hot-rolled wire rod to have small intensity fluctuation, good plasticity and uniform structure performance.
The technical scheme adopted by the invention for solving the technical problems is to provide a preparation method of a 30MnSi hot-rolled wire rod. The method comprises the following steps:
a. heating, rolling and spinning a 30MnSi billet to obtain a wire rod;
b. cooling the wire rod after spinning by adopting stelmor air cooling control, collecting coils and packaging to obtain the wire rod;
the stelmor air cooling adopts an air cooling roller way delayed slow cooling mode, and the speed of the air cooling roller way is controlled to be less than or equal to 0.34 m/s.
In the preparation method of the 30MnSi hot-rolled wire rod, in the step b, the speed of an air-cooled roller table is controlled to be 0.3-0.34 m/s in the stelmor air cooling.
Only open 1#Fan and 1#A heat preservation cover and a Jialing device corresponding to the fan, and a control 1#The flow of the fan is 20 ten thousand meters3/h；1#The opening degree of the Jialing device of the fan is 100 percent.
Further, in the step b, the stelmor air-cooled roller way speed is controlled as follows: the roller way speed of the 1 st to 3 rd roller ways is 0.3m/s, the roller way speed of the 4 th roller way is 0.31m/s, the roller way speed of the 5 th roller way is 0.32m/s, the roller way speed of the 6 th roller way is 0.33m/s, and the roller way speed of the 7 th to 13 th roller ways is 0.34 m/s.
Further, in the step b, in the stelmor air cooling process, the wire rod after spinning is from spinning to 1#And during the end period of the fan, the cooling speed of the wire rod is controlled to be 6-30 ℃/s.
Further, the wire rod goes from laying to discharging 1#The average cooling speed difference between the boundary point and the non-boundary point is less than or equal to 1 ℃/s.
Further, in the step b, in the stelmor air cooling process, the wire rod is controlled from spinning to discharging 1#When the fan is used, the temperature of the wire rod is 700-750 ℃ of the boundary point, and the temperature of the non-boundary point is 700-730 ℃.
Further, in step b, in the stelmor air cooling process, the wire rod passes through 1#The cooling speed after the fan is less than or equal to 2 ℃/s.
In the preparation method of the 30MnSi hot-rolled wire rod, in the step a, the spinning temperature is 900-915 ℃.
Further, in the step b, the temperature of the collection roll is more than or equal to 450 ℃.
The invention has the beneficial effects that:
according to the method, through the control of the roller way speed, the fan, the Jialing device, the opening of the heat preservation cover and the winding temperature, the 30MnSi hot-rolled wire rod for the PC steel bar has the advantages of small strength fluctuation, good plasticity and uniform structure performance. The 30MnSi hot-rolled wire rod prepared by the method has the tensile strength of 680-700 MPa, the range difference of less than or equal to 20MPa, the tensile strength difference of the same ring of less than or equal to 10MPa, the elongation after fracture of more than or equal to 25 percent and the reduction of area of more than or equal to 50 percent.
Detailed Description
Specifically, the invention provides a preparation method of a 30MnSi hot-rolled wire rod. The method comprises the following steps:
a. heating, rolling and spinning a 30MnSi billet to obtain a wire rod;
b. and (3) cooling the wire rod after spinning by adopting stelmor air cooling control, collecting the coil and packaging to obtain the wire rod.
In step a of the invention, the spinning temperature is controlledThe purpose of the temperature of 900-915 ℃ is as follows: (1) the control of the scale, if the temperature is lower, the scale on the surface of the wire rod is easy to break, oxygen rapidly diffuses in the scale on the surface of the wire rod, and FeO in contact with the surface of the wire rod is continuously oxidized into Fe2O3And Fe3O4Therefore, the red rust phenomenon appears on the surface of the wire rod, so that the iron scale before drawing is difficult to remove and the drawing fracture phenomenon appears, and the loss of the die is increased; (2) and the mechanical property is controlled, if the temperature is too high, austenite grains after spinning continue to grow, so that ferrite grains of a finished product are coarse, the spacing between pearlite lamellae is increased, and the strength and the plasticity of the wire rod are reduced.
In step b of the invention, the stelmor air-cooled roller way speed is controlled as follows: the roller way speed of the roller ways from the 1 st section to the 3 rd section (before phase change) is 0.3m/s, the roller way speed of the roller way from the 4 th section (during phase change) is increased by 0.1m/s section by section, and the junction points are changed through the change of the roller way speed and the natural falling of the wire rod among the roller ways, so that the temperature of the same coil rod in the phase change process is more uniform, and the hot rolled wire rod with uniform tissue performance is obtained; the speed of the roller ways of the 7 th segment and the subsequent roller ways (after phase change) is kept to be 0.34m/s and is not promoted any more, so that the wire rod after phase change can stay for a longer time at a high-temperature segment, the thermal stress concentration in the cooling process is reduced, the release of the processing stress and the phase change stress is accelerated, and the plasticity of the wire rod is improved.
In step b of the invention, the control of the fan and the Jialing device: 1#The blower presses 20 ten thousand meters3Flow rate/h is controlled from laying to 1#During the end period of the fan, the cooling speed of the wire rod is controlled to be between 6 and 30 ℃/s and 2#And then the fans are all closed; 1#The opening degree of a Jialing device of the fan is 100 percent so as to improve the cooling speed of a boundary point, reduce the temperature difference between the boundary point and a non-boundary point of the same coil, and control the temperature difference between the boundary point and the non-boundary point within 30 ℃; and controls the wire rod to go out 1#The temperature of the fan is 700-750 ℃ at the boundary point and 700-730 ℃ at the non-boundary point, so that the uniformity of the structure performance of the same circle of wire rods is improved, and the subsequent drawing is more stable.
The steps of the inventionb, controlling the heat preservation cover: 1#The heat preservation cover corresponding to the fan is completely opened, 2#And then the heat-insulating covers corresponding to the fans are all closed, so that the cooling speed of the wire rod in the period is less than or equal to 2 ℃/s, the wire rod can be ensured to fully complete phase transformation, a uniform ferrite and pearlite structure is obtained, the retention time of the wire rod in a high-temperature section is prolonged, the thermal stress concentration in the cooling process is reduced, the release of the processing stress and the phase transformation stress is accelerated, and the plasticity of the wire rod is improved.
In the step b, the temperature of the coil is more than or equal to 450 ℃, so that the coil is continuously kept at a higher temperature to reduce the thermal stress concentration in the cooling process, accelerate the release of the processing stress and the phase change stress and improve the plasticity of the wire rod.
The present invention is further illustrated in detail by the following specific examples.
Example 1
Preparation of 30MnSi hot-rolled wire rod with specification
Heating 30MnSi steel billet by a stepping heating furnace, and rolling the billet into the product by a 30-frame high-speed wire rolling unit
And (3) controlling the spinning temperature to be 900-915 ℃ by cooling the light circle with the specification through a water cooling tank, and then spinning through a spinning machine, wherein the actual spinning temperature is 900 ℃.
And (3) performing controlled cooling on the wire rod after spinning in a stelmor air cooling line, wherein the control parameters of the stelmor air cooling line are as follows:
(1) roller bed speed: the roller way speeds of the 1 st to 3 rd roller ways are all 0.3m/s, the roller way speed of the 4 th roller way is 0.31m/s, the roller way speed of the 5 th roller way is 0.32m/s, the roller way speed of the 6 th roller way is 0.33m/s, and the roller way speeds of the 7 th to 13 th roller ways are all 0.34 m/s.
(2) A fan: 1#The flow of the fan is 20 ten thousand meters3/h，2#And then the fans are all closed.
(3) Jialing device: 1#The opening degree of the Jialing device corresponding to the fan is 100 percent, 2#And then the Jialing devices corresponding to the fans are all closed.
(4) A heat preservation cover: 1#The heat preservation cover corresponding to the fan is completely opened, 2#And then the heat preservation covers corresponding to the fans are all closed.
(5) Temperature and cooling rate of key points: wire rod outlet 1#The temperature of the fan is 715 ℃ at the boundary point, 700 ℃ at the non-boundary point and 15 ℃ at the temperature difference; from laying to discharge 1#The average cooling speed of the fan is 6.75 ℃/s, and the average cooling speed of the fan without the junction is 7.30 ℃/s; the winding temperature is 450 ℃, and the wire rod is discharged from the outlet 1#The average cooling rate during the fan to header was 0.86 ℃/s.
Prepared by the method
The 30MnSi hot-rolled wire rod structure with the specification is ferrite and pearlite, and the grain size of the ferrite is 11.0 grade; the tensile strength joint point is 691MPa, the non-joint point is 700MPa, and the difference of the tensile strength of the same circle is 9 MPa; the percentage elongation after fracture is 28.5 percent, and the percentage elongation without fracture is 31.0 percent; the area shrinkage was 57% at the boundary point and 59% at the non-boundary point.
Example 2
Preparation of 30MnSi hot-rolled wire rod with specification
Heating 30MnSi steel billet by a stepping heating furnace, and rolling the billet into the product by a 30-frame high-speed wire rolling unit
And (3) controlling the spinning temperature to be 900-915 ℃ by cooling the light circle with the specification through a water cooling box, and then spinning through a spinning machine, wherein the actual spinning temperature is 915 ℃.
And (3) performing controlled cooling on the wire rod after spinning in a stelmor air cooling line, wherein the control parameters of the stelmor air cooling line are as follows:
(1) roller bed speed: the roller way speeds of the 1 st to 3 rd roller ways are all 0.3m/s, the roller way speed of the 4 th roller way is 0.31m/s, the roller way speed of the 5 th roller way is 0.32m/s, the roller way speed of the 6 th roller way is 0.33m/s, and the roller way speeds of the 7 th to 13 th roller ways are all 0.34 m/s.
(2) A fan: 1#The flow of the fan is 20 ten thousand meters3/h，2#And then the fans are all closed.
(3) Jialing device: 1#The opening degree of the Jialing device corresponding to the fan is 100 percent, 2#And then the Jialing devices corresponding to the fans are all closed.
(4) A heat preservation cover: 1#The heat preservation cover corresponding to the fan is completely opened, 2#And then the heat preservation covers corresponding to the fans are all closed.
(5) Temperature and cooling rate of key points: wire rod outlet 1#The temperature of the fan is 736 ℃, 714 ℃ and 22 ℃ when the temperature is not limited; from laying to discharge 1#The average cooling speed of the fan is 6.53 ℃/s, and the average cooling speed of the fan without the junction is 7.36 ℃/s; the winding temperature is 476 ℃, and the wire rod is discharged from the outlet 1#The average cooling rate during the fan to header was 0.81 ℃/s.
Prepared by the method
The 30MnSi hot-rolled wire rod structure with the specification is ferrite and pearlite, and the grain size of the ferrite is 11.0 grade; the tensile strength contact point is 680MPa, the non-contact point is 690MPa, and the difference of the tensile strength of the same circle is 10 MPa; the elongation percentage after fracture is 30.0 percent of a boundary point and the non-boundary point is 31.5 percent; the area shrinkage was 64% at the boundary point and 67% at the non-boundary point.
Example 3
Preparation of 30MnSi hot-rolled wire rod with specification
Heating 30MnSi steel billet by a stepping heating furnace, and rolling the billet into the product by a 30-frame high-speed wire rolling unit
The spinning temperature of the light circle with the specification is controlled to be 900-915 ℃ through cooling of a water cooling box, and then spinning is carried out through a spinning machine, wherein the actual spinning temperature is 907 ℃.
And (3) performing controlled cooling on the wire rod after spinning in a stelmor air cooling line, wherein the control parameters of the stelmor air cooling line are as follows:
(1) roller bed speed: the roller way speeds of the 1 st to 3 rd roller ways are all 0.3m/s, the roller way speed of the 4 th roller way is 0.31m/s, the roller way speed of the 5 th roller way is 0.32m/s, the roller way speed of the 6 th roller way is 0.33m/s, and the roller way speeds of the 7 th to 13 th roller ways are all 0.34 m/s.
(2) A fan: 1#The flow of the fan is 20 ten thousand meters3/h，2#And then the fans are all closed.
(3) Jialing device: 1#The opening degree of the Jialing device corresponding to the fan is 100 percent, 2#And then the Jialing devices corresponding to the fans are all closed.
(4) A heat preservation cover: 1#The heat preservation cover corresponding to the fan is completely opened, 2#And then the heat preservation covers corresponding to the fans are all closed.
(5) Temperature and cooling rate of key points: go out 1#When the fan is used, the temperature of the wire rod is 750 ℃, the non-contact point is 722 ℃, and the temperature difference is 28 ℃; from laying to discharge 1#The average cooling speed of the fan is 6.0 ℃/s, and the average cooling speed of the fan without the junction is 6.75 ℃/s; the winding temperature is 491 ℃, and the winding temperature is 1 ℃ from the beginning#The average cooling rate during the fan to header was 0.83 ℃/s.
Prepared by the method
The 30MnSi hot-rolled wire rod structure with the specification is ferrite and pearlite, and the grain size of the ferrite is 11.0 grade; the tensile strength bonding point is 684MPa, the non-bonding point is 691MPa, and the difference of the tensile strength of the same circle is 7 MPa; the elongation percentage after fracture is 27.5 percent of a boundary point and the non-boundary point is 30.0 percent; the area shrinkage was 58% at the boundary point and 59% at the non-boundary point.
Comparative example 1
Preparation of 30MnSi hot-rolled wire rod with specification
Heating a 30MnSi billet (the same furnace blank as the example 1) by a stepping heating furnace, and rolling the billet into the billet by a 30-rack high-speed wire rolling unit
And (3) controlling the spinning temperature to be 900-915 ℃ by cooling the light circle with the specification through a water cooling tank, and then spinning through a spinning machine, wherein the actual spinning temperature is 900 ℃. And (3) performing controlled cooling on the wire rod after spinning in a stelmor air cooling line, wherein the control parameters of the stelmor air cooling line are as follows:
(1) roller bed speed: the roller way speeds of the 1 st to 3 rd roller ways are all 0.3m/s, the roller way speed of the 4 th roller way is 0.31m/s, the roller way speed of the 5 th roller way is 0.32m/s, the roller way speed of the 6 th roller way is 0.33m/s, and the roller way speeds of the 7 th to 13 th roller ways are all 0.34 m/s.
(2) A fan: all fans are turned off.
(3) Jialing device: all the Jialing devices are turned off.
(4) A heat preservation cover: all the heat preservation covers are opened.
(5) Temperature and cooling rate of key points: go out 1#When the fan is used, the temperature of the wire rod is 820 ℃, the non-boundary point is 745 ℃, and the temperature difference is 75 ℃; from laying to discharge 1#The average cooling speed of the fan is 3 ℃/s, and the average cooling speed of the fan without the junction is 5.7 ℃/s; the winding temperature was 310 ℃.
Prepared by the method
The 30MnSi hot-rolled wire rod structure with the specification is ferrite and pearlite, and the grain size of the ferrite is 10 grades; the tensile strength joint point is 685MPa, the non-joint point is 730MPa, and the difference of the tensile strength of the same circle is 45 MPa; the elongation percentage after fracture is 24.5 percent of a boundary point and the non-boundary point is 27.0 percent; the area shrinkage was 51% at the boundary point and 54% at the non-boundary point.
Compared with the embodiment 1, the wire rod is naturally cooled after spinning, the cooling speed is slow, the wire rod is in a high-temperature state for a long time, austenite grains grow further before phase transformation, final ferrite grains are coarsened, the cooling speed in the phase transformation period is faster, the pearlite lamellar spacing is reduced, the strength of a finished product is increased, and the plasticity is reduced; meanwhile, the cooling speed of the joint is far lower than that of the non-joint, so that the difference of the mechanical properties of the wire rod in the same circle is increased.
Comparative example 2
Preparation of 30MnSi hot-rolled wire rod with specification
Heating a 30MnSi billet (the same furnace blank as the example 2) by a stepping heating furnace, and rolling the billet into the billet by a 30-rack high-speed wire rolling unit
And (3) controlling the spinning temperature to be 900-915 ℃ by cooling the light circle with the specification through a water cooling box, and then spinning through a spinning machine, wherein the actual spinning temperature is 915 ℃.
And (3) performing controlled cooling on the wire rod after spinning in a stelmor air cooling line, wherein the control parameters of the stelmor air cooling line are as follows:
(1) roller bed speed: the roller way speeds of the 1 st to 3 rd roller ways are all 0.3m/s, the roller way speed of the 4 th roller way is 0.31m/s, the roller way speed of the 5 th roller way is 0.32m/s, the roller way speed of the 6 th roller way is 0.33m/s, and the roller way speeds of the 7 th to 13 th roller ways are all 0.34 m/s.
(2) A fan: 1#～4#The flow of the fan is 20 ten thousand meters3/h，5#And then the fans are all closed.
(3) Jialing device: 1#～4#The opening degree of the Jialing device corresponding to the fan is 100 percent and 5 percent#And then the Jialing devices corresponding to the fans are all closed.
(4) A heat preservation cover: 1#～4#The heat preservation cover corresponding to the fan is completely opened, 5#And then the heat preservation covers corresponding to the fans are all closed.
(5) Temperature and cooling rate of key points: go out 1#When the fan is used, the temperature of the wire rod is 735 ℃, the non-boundary point is 715 ℃ and the temperature difference is 20 ℃; from laying to discharge 1#The average cooling speed of the fan is 6.53 ℃/s, and the average cooling speed of the fan without the junction is 7.36 ℃/s; the winding temperature was 195 ℃.
Prepared by the method
The 30MnSi hot-rolled wire rod structure with the specification is ferrite and pearlite, and the grain size of the ferrite is 11.5 grade; the tensile strength joint point is 752MPa, the non-joint point is 735MPa, and the difference of the tensile strength of the same circle is 17 MPa; the elongation percentage after fracture is 32.0 percent of a lap point and the non-lap point is 33 percent; the area shrinkage was 63% at the boundary point and 62% at the non-boundary point.
Compared with the embodiment 2, the fans 1# to 4# are all in an open state after the wire rod is spun, and when the wire rod enters the heat-preserving cover (the fan 5 #), the temperature of the fan is already below 600 ℃, the phase change is completed, and then the mechanical property is basically not obviously influenced. But because the fan accelerates cooling before and during phase change, ferrite grains are finer, the pearlite lamellar spacing is smaller, so that the strength and the plasticity are higher, the tensile strength is far beyond the control target of 680-700 MPa, the drawing is difficult, the die loss is large, the fracture is easy, and the difference of the tensile strength of the same circle is larger than that of the embodiment.
Claims (9)
- The preparation method of the 1.30MnSi hot-rolled wire rod is characterized by comprising the following steps: the method comprises the following steps:a. heating, rolling and spinning a 30MnSi billet to obtain a wire rod;b. cooling the wire rod after spinning by adopting stelmor air cooling control, collecting coils and packaging to obtain the wire rod;the stelmor air cooling adopts an air cooling roller way delayed slow cooling mode, and the speed of the air cooling roller way is controlled to be less than or equal to 0.34 m/s.
- 2. The method of producing a 30MnSi hot rolled wire rod according to claim 1, characterized in that: in step b, the stelmor air cooling meets at least one of the following conditions:controlling the speed of the air cooling roller bed to be 0.3-0.34 m/s;only open 1#Fan and 1#A heat preservation cover and a Jialing device corresponding to the fan, and a control 1#The flow of the fan is 20 ten thousand meters3/h；1#The opening degree of the Jialing device of the fan is 100 percent.
- 3. The method of producing a 30MnSi hot-rolled wire rod according to claim 1 or 2, characterized in that: in the step b, the stelmor air-cooled roller way speed is controlled as follows: the roller way speed of the 1 st to 3 rd roller ways is 0.3m/s, the roller way speed of the 4 th roller way is 0.31m/s, the roller way speed of the 5 th roller way is 0.32m/s, the roller way speed of the 6 th roller way is 0.33m/s, and the roller way speed of the 7 th to 13 th roller ways is 0.34 m/s.
- 4. The method of producing a 30MnSi hot rolled wire rod according to claim 2, characterized in that: in the step b, in the stelmor air cooling process, the wire rod after spinning is from spinning to 1#And during the end period of the fan, the cooling speed of the wire rod is controlled to be 6-30 ℃/s.
- 5. The method of producing a 30MnSi hot rolled wire rod according to claim 2, characterized in that: in the step b, in the stelmor air cooling process, the wire rod is controlled from spinning to discharging 1#When the fan is used, the temperature of the wire rod is 700-750 ℃ of the boundary point, and the temperature of the non-boundary point is 700-730 ℃.
- 6. The method of producing a 30MnSi hot rolled wire rod according to claim 2, characterized in that: in the step b, in the stelmor air cooling process, the wire rod is discharged from the spinning to the outlet 1#Average cooling rate difference between a boundary point and a non-boundary point when using a fan≤1℃/s。
- 7. The method of producing a 30MnSi hot rolled wire rod according to claim 2, characterized in that: step by stepIn step b, in the stelmor air cooling process, the wire rod passes through 1#The cooling speed after the fan is less than or equal to 2 ℃/s.
- 8. The method of producing a 30MnSi hot rolled wire rod according to claim 1, characterized in that: in the step a, the spinning temperature is 900-915 ℃.
- 9. The method of producing a 30MnSi hot rolled wire rod according to claim 1, characterized in that: in the step b, the temperature of the collection roll is more than or equal to 450 ℃.
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