CN113245376A - Controlled rolling and controlled cooling method for producing high-quality wire steel by using 83m stelmor roller way matched with Morgan fifth-generation rolling mill - Google Patents
Controlled rolling and controlled cooling method for producing high-quality wire steel by using 83m stelmor roller way matched with Morgan fifth-generation rolling mill Download PDFInfo
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- CN113245376A CN113245376A CN202110390837.1A CN202110390837A CN113245376A CN 113245376 A CN113245376 A CN 113245376A CN 202110390837 A CN202110390837 A CN 202110390837A CN 113245376 A CN113245376 A CN 113245376A
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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
- 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
- B21B37/46—Roll speed or drive motor control
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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
- B21B45/008—Heat shields
Abstract
The invention discloses a controlled rolling and controlled cooling method for producing high-quality wire steel by using a Morgan fifth generation rolling mill matched with a 83m Stelmor roller way, which is characterized by comprising the following steps of: the method comprises the following steps: a stelmor roller way heat preservation cover, wherein the first six openings comprise 200-mm slits, and the rest are completely closed; the stelmor roller speed is increased by 0.01m/s by adopting the speed of each two groups of roller; controlling the heating temperature of the casting blank to be 1050-1100 ℃; the initial rolling temperature is 960-1000 ℃, the finish rolling inlet temperature is 860-880 ℃, and the spinning temperature is 850-860 ℃. The invention aims to provide a controlled rolling and cooling method for producing high-quality wire steel by using a Morgan fifth generation rolling mill matched with an 83m Stelmor roller way, so that the tensile strength of the high-quality wire steel (H08C) is more than or equal to 700MPa, the surface shrinkage is more than or equal to 60%, and the metallographic structure is ferrite, pearlite and a small amount of bainite.
Description
Technical Field
The invention relates to the technical field of metallurgy and rolling, in particular to a controlled rolling and cooling method for producing high-quality wire steel by using a Morgan fifth generation rolling mill and a 83m Steyr roller way.
Background
The No. 1 wire of a ladle steel long material factory is a high-speed wire rod production factory, and the main rolling mill equipment is a Morgan fifth generation rolling mill introduced from the Morgan company, wherein the main rolling mill equipment comprises a pre-finishing mill, a pinch roll, a wire laying head and the like, and is provided with a stelmor cooling wire. 6 groups of water tanks are arranged on the whole line, and one group is arranged after pre-finish rolling, and the temperature of a finish rolling inlet is mainly controlled; 5 groups of water tanks are arranged behind the finishing mill and distributed on a distance of about 50m, and the cooling after finishing rolling is mainly controlled to ensure that the temperature reaches the required spinning temperature. The individual tank flows can be controlled manually or automatically to achieve the desired control conditions. In addition, a cooling guide is arranged between the finishing mill frames to regulate the finishing temperature and the finishing outlet temperature. A83 m-long stelmor cooling line is arranged behind the laying head, a heat-insulating cover is arranged on the cooling line, and 10 fans are arranged below the laying head, so that standard cooling and delay cooling can be realized. The stelmor roller way has adjustable speed to adjust the distance of the coil and also play the role of cooling control.
Although the Morgan fifth generation rolling mills in China are basically the same, the stelmor roller ways of various high-speed wire production plants are different in length, so that the structure performance after controlled rolling and controlled cooling is also different. The stelmor roller way length of a general steel mill is more than 100 meters, and the delayed cooling is well controlled. The 83 m-long stelmor roller way is shorter, the product performance and the structure of the product subjected to delayed cooling control on the 83 m-long stelmor cooling line often cannot meet the requirements, and particularly, the high-quality wire steel has higher requirements on the performance and the structure of a finished product. Therefore, in order to ensure the excellent drawing performance and structure, a controlled rolling and controlled cooling method for producing high-quality wire steel by using a Morgan fifth generation rolling mill and a 83m Stelmor roller way is required to be researched, so that the tensile strength of the high-quality wire steel (H08C) is more than or equal to 700MPa, the surface shrinkage is more than or equal to 60 percent, and the metallographic structure is ferrite, pearlite and a small amount of bainite.
Disclosure of Invention
The invention aims to provide a controlled rolling and cooling method for producing high-quality wire steel by using a Morgan fifth generation rolling mill matched with an 83m Stelmor roller way, so that the tensile strength of the high-quality wire steel (H08C) is more than or equal to 700MPa, the surface shrinkage is more than or equal to 60%, and the metallographic structure is ferrite, pearlite and a small amount of bainite.
In order to solve the technical problems, the invention adopts the following technical scheme:
a controlled rolling and controlled cooling method for producing high-quality wire steel by using a Morgan fifth-generation rolling mill and a 83m Stelmo roller way comprises the following steps:
a stelmor roller way heat preservation cover, wherein the first six openings comprise 200-mm slits, and the rest are completely closed; the stelmor roller speed is increased by 0.01m/s by adopting the speed of each two groups of roller;
controlling the heating temperature of the casting blank to be 1050-1100 ℃; the initial rolling temperature is 960-1000 ℃, the finish rolling inlet temperature is 860-880 ℃, and the spinning temperature is 850-860 ℃.
Furthermore, the first-stage speed of the roller way is 0.13 m/s.
Further, the wire steel is H08C wire steel.
Furthermore, the welding wire steel comprises the following chemical components, by mass, 0.011% of C, 0.10-0.40% of Si, 1.30-1.90% of Mn, 0.025% or less of P, 0.025% or less of S, 0.20-0.60% of Mo, 0.10-0.40% of Ti, 0.020% or less of B, and the balance of Fe and inevitable impurities thereof.
Compared with the prior art, the invention has the beneficial technical effects that:
the production method has the advantages that the high-quality wire steel is produced on the equipment matched with the 83m Stelmor roller way of the Morgan rolling mill, the structure is ferrite + pearlite and bainite as few as possible while the strength and the face shrinkage are improved, the produced high-quality wire steel can obtain excellent structure and performance, and the drawing and welding performance of the high-quality wire steel (H08C) is improved.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a line graph of tensile strength for a five-pack scheme;
FIG. 2 is a line graph of elongation for a five-pack protocol;
FIG. 3 is a surface shrinkage line graph of a five-group scheme;
FIG. 4 shows metallographic structures of the first to fifth process schemes;
fig. 5 is a photograph of the metallographic structure of the finished product.
Detailed Description
A controlled rolling and cooling method for producing high-quality wire steel by a Morgan fifth generation rolling mill matched with an 83m Stelmo roller way ensures that on equipment matched with the 83m Stelmo roller way of the Morgan rolling mill, while the strength and the face shrinkage are improved, the structure is ferrite plus pearlite and bainite as little as possible, and the produced high-quality wire steel can obtain excellent structure and performance so as to improve the drawing and welding performance of the high-quality wire steel (H08C).
The main production steps of high-quality wire steel (H08C) are as follows:
molten iron pretreatment → 80 ton top-bottom combined blown converter → LF furnace refining → continuous casting blank → acceptance inspection, feeding → billet heating → high pressure water descaling → roughing mill rolling → medium mill rolling → pre-finishing mill rolling → controlled water cooling → diameter gauge → laying head → stelmor roller cooling → coil collection → trimming, surface quality inspection → packing → weighing → tag hanging → warehousing.
TABLE 1 stock heating schedule
| Heating period time | Time of soaking period | Total heating time | Temperature of heating zone | Temperature of soaking zone |
| 1h20min | 40min | 2h | 1050-1100℃ | 1060-1100℃ |
TABLE 2 Rolling Process parameters
The first six of the stelmor roller way heat preservation covers are provided with 200-mm cracks and the rest are completely closed.
The heating temperature of the casting blank is controlled to be 1050-1100 ℃, and the aim is to ensure that the heating temperature of the steel blank is uniform inside and outside and also prevent Si from being precipitated due to overhigh steel temperature. The initial rolling temperature is 960-1000 ℃, the finish rolling inlet temperature is 860-880 ℃, the spinning temperature is 850-860 ℃, the initial rolling temperature and the spinning temperature cannot be too high, otherwise, due to too high cooling speed, bainite structures in the metallographic structure of the finished product are too much, the reduction of the face shrinkage rate is caused, and the drawing performance is poor.
In order to enhance the slow cooling effect of the stelmor roller way, 200-plus-300 mm gaps are formed in the first six heat-insulating covers, so that the wire rod enters the phase change temperature as soon as possible, and meanwhile, the temperature difference between the lap joint point and the non-lap joint point of the wire rod cannot be too large. The stelmor roller way speed is increased by 0.01m/s by adopting the speed of every two groups of roller ways, the wire rod is enabled to pass through the change of the roller way speed while the wire rod is in the heat-insulating cover as long as possible, the position of a lap joint point is staggered, and the uniformity of cooling the wire rod is ensured.
TABLE 3H 08C chemical composition
According to the chemical composition and CCT curve of H08C and the characteristics of equipment, the experimental process parameters are formulated as follows:
TABLE 4 stock heating schedule
TABLE 5 Rolling Process parameters
In order to improve the drawing property of H08C, the tensile strength is reduced as much as possible, and the elongation and the area shrinkage are increased. Thus, five different process schemes are given and comparative experiments are performed as shown in table 6.
TABLE 6 mechanical property test results of each case
As can be seen from table 6 and the examination results of fig. 1 to 3, the tensile strength gradually decreases as a whole, and the elongation and the area shrinkage rate increase as a whole, as the cooling rate decreases.
FIG. 4 shows metallographic structures of the first to fifth process schemes, the metallographic structures of the first to third schemes are B structures, and the metallographic structures of the fourth to fifth schemes are F + P + B structures(small amount)The structure and the grain size are basically about 10.5 grades. It can be seen that the spinning temperature is about 860 ℃ and the roller speed is highWhen the degree is 0.13m/s, the wire rod obtains F + P + B(small amount)And (4) organizing.
In the fifth scheme, the metallographic structure has the most ferrite, the least bainite and the best surface shrinkage, so the fifth scheme is selected as the controlled rolling and controlled cooling parameter for producing the high-quality wire steel (H08C).
The high-quality wire steel H08C produced by adopting the controlled rolling and controlled cooling parameters of the invention has the advantages that the tensile strength and the surface shrinkage rate both meet the standard requirements, the proportion of ferrite and pearlite is high, the surface shrinkage rate is good, and the use requirements of users can be met, as can be seen from Table 7. By adopting a proper rolling and cooling control process, the strength and the dough shrinkage are ensured, the tissue of a finished product is also ensured to be controlled, and the defect caused by the short stelmor roller way is well overcome.
TABLE 7 results of mechanical Properties examination
| Furnace number | Tensile strength (MPa) | Elongation after Break (%) | Face shrinkage (%) |
| Example 1 | 727 | 21 | 69 |
| Example 2 | 722 | 21 | 69 |
| Example 3 | 725 | 21 | 68 |
| Example 4 | 727 | 21 | 67 |
| Example 5 | 721 | 22 | 68 |
| Example 6 | 724 | 22 | 70 |
| Example 7 | 727 | 22 | 67 |
| Example 8 | 722 | 22 | 66 |
| Example 9 | 714 | 22 | 70 |
| Example 10 | 721 | 22 | 69 |
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (4)
1. A controlled rolling and controlled cooling method for producing high-quality wire steel by using a Morgan fifth-generation rolling mill and a 83m Stelmo roller way is characterized in that: the method comprises the following steps:
a stelmor roller way heat preservation cover, wherein the first six openings comprise 200-mm slits, and the rest are completely closed; the stelmor roller speed is increased by 0.01m/s by adopting the speed of each two groups of roller;
controlling the heating temperature of the casting blank to be 1050-1100 ℃; the initial rolling temperature is 960-1000 ℃, the finish rolling inlet temperature is 860-880 ℃, and the spinning temperature is 850-860 ℃.
2. The controlled rolling and controlled cooling method for producing high-quality wire steel by using the Morgan fifth generation rolling mill and the 83m Steyr roller bed in cooperation with the claim 1, is characterized in that: the first section speed of the roller way is 0.13 m/s.
3. The controlled rolling and controlled cooling method for producing high-quality wire steel by using the Morgan fifth generation rolling mill and the 83m Steyr roller bed in cooperation with the claim 1, is characterized in that: the welding wire steel is H08C welding wire steel.
4. The controlled rolling and controlled cooling method for producing high-quality wire steel by using the Morgan fifth generation rolling mill and the 83m Steyr roller bed, which is characterized in that: the welding wire steel comprises the following chemical components, by mass, less than or equal to 0.011% of C, 0.10-0.40% of Si, 1.30-1.90% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 0.20-0.60% of Mo, 0.10-0.40% of Ti, less than or equal to 0.020% of B, and the balance of Fe and inevitable impurities.
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| CN202110390837.1A CN113245376A (en) | 2021-04-12 | 2021-04-12 | Controlled rolling and controlled cooling method for producing high-quality wire steel by using 83m stelmor roller way matched with Morgan fifth-generation rolling mill |
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| CN202110390837.1A CN113245376A (en) | 2021-04-12 | 2021-04-12 | Controlled rolling and controlled cooling method for producing high-quality wire steel by using 83m stelmor roller way matched with Morgan fifth-generation rolling mill |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114871397A (en) * | 2022-03-28 | 2022-08-09 | 本钢板材股份有限公司 | High-quality steel wire rod for cold heading and preparation method thereof |
| CN115245956A (en) * | 2022-09-22 | 2022-10-28 | 江苏永钢集团有限公司 | Production method of bainite high-strength welding wire steel with uniform structure |
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2021
- 2021-04-12 CN CN202110390837.1A patent/CN113245376A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114871397A (en) * | 2022-03-28 | 2022-08-09 | 本钢板材股份有限公司 | High-quality steel wire rod for cold heading and preparation method thereof |
| CN115245956A (en) * | 2022-09-22 | 2022-10-28 | 江苏永钢集团有限公司 | Production method of bainite high-strength welding wire steel with uniform structure |
| CN115245956B (en) * | 2022-09-22 | 2022-12-13 | 江苏永钢集团有限公司 | Production method of bainite high-strength welding wire steel with uniform structure |
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