CN114406000A - Continuous casting and rolling method for common low-carbon steel medium plate - Google Patents
Continuous casting and rolling method for common low-carbon steel medium plate Download PDFInfo
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- CN114406000A CN114406000A CN202210058870.9A CN202210058870A CN114406000A CN 114406000 A CN114406000 A CN 114406000A CN 202210058870 A CN202210058870 A CN 202210058870A CN 114406000 A CN114406000 A CN 114406000A
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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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
- B21B43/003—Transfer to bed
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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
- B21B45/004—Heating 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
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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
- B21B45/04—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 de-scaling, e.g. by brushing
Abstract
The invention discloses a continuous casting and rolling method of a common low-carbon steel medium plate, which relates to the technical field of steel production.A blank produced by a continuous casting workshop is directly conveyed to a steel rolling workshop through a conveying roller way and is loaded into a heating furnace without a pile cooling link, and the surface temperature of the blank is more than 800 ℃ when the blank is loaded into the furnace; and (3) blank heating process: the furnace time is more than or equal to 60min, the soaking time is more than or equal to 10min, the temperature uniformity is less than or equal to 15 ℃, and the furnace discharging temperature is 1120-1250 ℃. Compared with the traditional heating mode, the method has the advantages of greatly reducing the gas consumption, being beneficial to the control of the production rhythm, reducing the production cost, reducing the surface defects of the steel plate caused by the uneven heating temperature rate of the steel billet, and the like.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a continuous casting and rolling method of a common low-carbon steel medium plate.
Background
The total yield of steel in China is increased year by year, the huge consumption of energy is accompanied, and the production process of the steel mainly depends on the energy conversion of coal, gas and electric power, so that the reduction of energy consumption of steel per ton is an important means for controlling the production cost and improving the product profit.
At present, the main production modes of the medium plate are as follows: firstly, the smelted molten steel is poured into a crystallizer of a continuous casting machine, a steel billet which meets the technical requirements and the design size is produced by controlling the solidification speed and the drawing speed of the molten steel, and the continuously cast steel billet needs to be placed into a cold-piled pit for slow cooling. When the temperature of the steel billet is slowly cooled to be lower than 200 ℃, the steel billet is loaded into a stepping heating furnace according to the arrangement of a steel rolling plan, is uniformly heated to 1100-1250 ℃, is discharged and enters a rolling procedure. In the production process, the steel billet undergoes the process of reducing the high-temperature state from continuous casting to below 200 ℃ and then raising the temperature again, and the process is accompanied with the consumption of heat and the great waste of energy sources, thereby increasing the production cost. Meanwhile, under the influence of the production process, the heating temperature of each steel billet is inconsistent, and under the influence of the steel rolling rhythm, the fluctuation of the heating rate and the heat preservation time of the steel billet in the secondary heating process is large, so that the steel billet is heated unevenly, and the rolling plate shape, the surface quality of a product and the like are influenced to a certain extent.
Disclosure of Invention
The invention aims at the technical problems and overcomes the defects of the prior art, provides a continuous casting and rolling method of a common low-carbon steel medium plate, improves the layout of a steel-making workshop and a steel-rolling workshop, connects a continuous casting production line and a steel-rolling production line,
the blank produced by the continuous casting workshop is directly conveyed to a steel rolling workshop through a conveying roller way and is loaded into a heating furnace without a pile cooling link, and the surface temperature of the blank is more than 800 ℃ when the blank is loaded into the furnace;
and (3) blank heating process: the furnace time is more than or equal to 60min, the soaking time is more than or equal to 10min, the temperature uniformity is less than or equal to 15 ℃, and the furnace discharging temperature is 1120-1250 ℃.
The technical scheme of the invention is further defined as follows:
the continuous casting and rolling method for the common low-carbon steel medium plate comprises the following steps of: the thickness is 150mm, the width is less than or equal to 3200mm, and the length is less than or equal to 17600 mm.
The continuous casting and rolling method for the common low-carbon steel medium plate comprises the following chemical components in percentage by mass: c is less than or equal to 0.25 percent, Si is less than or equal to 0.5 percent, Mn: 0.8 to 2 percent of Fe, less than or equal to 0.04 percent of P, less than or equal to 0.04 percent of S, less than or equal to 0.01 percent of Nb, less than or equal to 0.1 percent of Ti, less than or equal to 0.4 percent of Cr, less than or equal to 0.4 percent of Ni, less than or equal to 0.3 percent of Cu, less than or equal to 0.3 percent of Mo, and the balance of Fe and inevitable impurities.
According to the continuous casting and rolling method for the common low-carbon steel medium plate, the surface quality of the steel billet is checked before charging, and if burrs exist, the steel billet needs to be cleaned; the defects of no allowance of cracks and large-area unevenness need to be detected before the billet is put into the heating furnace.
In the continuous casting and rolling method for the common low-carbon steel medium plate, a reciprocating medium plate mill is required for rolling, and the rolled piece is subjected to heat preservation in the rolling process.
The invention has the beneficial effects that: the invention firstly reforms the layout of the steel-making and steel-rolling workshops, connects the continuous casting production line with the steel-rolling production line, cancels the cold-stacking scheme in the process design, organizes the production plan in advance, namely directly conveys the steel billet which is just produced to the inlet of the stepping heating furnace, heats the steel billet in the furnace to the temperature required by the process, preserves the temperature, and discharges the steel billet according to the steel-rolling rhythm. When the method is adopted for production, the time for heating the steel billet to the temperature required by the process is short, the heat preservation time in the furnace is long, and the integral temperature uniformity of the steel billet is better. In addition, because the temperature rise range is small when the billet is heated to the target temperature, the temperature rise rate can be properly reduced in the heating process, and the surface defects of the billet surface caused by the high heating rate are avoided to a certain extent. Compared with the traditional method for production, the method can save the gas consumption of the heating furnace per ton steel in the aspect of energy consumption by about 18 percent.
Detailed Description
The continuous casting and rolling method for the common low-carbon steel medium plate provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.24%, Si: 0.12%, Mn: 0.96%, P: 0.003%, S: 0.009%, Nb: 0.002%, Ti: 0.08%, Cr: 0.12%, Ni: 0:25%, Cu: 0:09%, Mo: 0.004%, and the balance of Fe and inevitable impurities.
The specifications of the produced continuous casting billet are as follows: the thickness is 150mm, the width is 2865mm, and the length is 8650 mm; the specification of the finished product is 12mm multiplied by 2800mm multiplied by 10 m. And (3) shearing to produce 10 steel plates, and taking a performance detection sample at the tail part of the first steel plate in the shearing process.
And (3) directly conveying the blank produced by the continuous casting machine to the position of a steel charging furnace door of the heating furnace through a roller way, simultaneously inspecting the surface quality of the blank, purging redundant burrs, and confirming that the surface has no defects such as cracks, rough surface and the like.
And (3) moving the steel billets in the heating furnace to the outlet direction in sequence along with the movement of the stepping inner beam of the heating furnace, opening a steel loading furnace door when the vacant position at the inlet of the heating furnace meets the condition of loading the steel billets, starting a steel loading machine, and feeding the blanks into the stepping heating furnace, wherein the temperature of the blanks is 810 ℃ during loading. After the steel billet is loaded into the heating furnace, the steel billet moves along with the walking beam, the moving speed of the walking beam of the heating furnace is adjusted according to the steel rolling rhythm, and the steel billet passes through 3 areas of the preheating section, the heating section and the heat preservation section in the furnace in sequence.
The time of the blank in the furnace is 75min totally, the soaking time is 25min, the temperature uniformity is 8 ℃, and the tapping temperature is 1145 ℃. And conveying the steel billets to a descaling box through a conveying roller way after the steel billets are discharged, removing oxide skins on the upper and lower surfaces of the steel billets, conveying the steel billets to an inlet of a rolling mill through the roller way after descaling, and entering a rolling process.
The rolling process adopts a 3500 reciprocating steckel mill to roll 11 passes, and rolling is adopted in 9 th and 10 th passes to ensure the final rolling temperature of the rolled piece.
After rolling, the temperature of a rolled piece is reduced by adopting a laminar cooling mode, so that the product performance meets the design requirement, meanwhile, the rolled piece is divided into 3 sections by a flying shear, and the sections are straightened by a hot straightening machine, then are loaded on a cooling bed and conveyed to a shearing area.
And cutting the size of the steel plate after the rolled piece enters a finishing area, simultaneously cutting a performance detection sample, spraying marks on the cut steel plate, warehousing after the surface inspection is qualified, and detecting the cut sample in a physical and chemical room.
And (4) manager detection is carried out, the steel plate produced by the rolled piece meets the technical requirements, and the steel plate enters a delivery flow for customers to use.
The invention greatly reduces the consumption of gas for each ton of steel, is more beneficial to the control of production rhythm, and reduces the defects of pitted surface, pitted pit and the like formed on the surface of a product caused by uneven heating temperature rate of a steel billet while reducing the production cost. Compared with the traditional method for production, the gas consumption of the heating furnace per ton of steel can be saved by about 18 percent when the process is adopted for production, the gas cost per ton of steel is saved by about 8.5 yuan, the annual output of one production line is calculated according to 160 ten thousand tons, and the cost can be saved by 1360 ten thousand yuan per year.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A continuous casting and rolling method of a common low-carbon steel medium plate is characterized by comprising the following steps: the layout of a steel-making workshop and a steel-rolling workshop is reformed, a continuous casting production line and a steel-rolling production line are connected,
the blank produced by the continuous casting workshop is directly conveyed to a steel rolling workshop through a conveying roller way and is loaded into a heating furnace without a pile cooling link, and the surface temperature of the blank is more than 800 ℃ when the blank is loaded into the furnace;
and (3) blank heating process: the furnace time is more than or equal to 60min, the soaking time is more than or equal to 10min, the temperature uniformity is less than or equal to 15 ℃, and the furnace discharging temperature is 1120-1250 ℃.
2. The continuous casting and rolling method of a common low-carbon steel medium plate according to claim 1, characterized in that: specification of produced blank: the thickness is 150mm, the width is less than or equal to 3200mm, and the length is less than or equal to 17600 mm.
3. The continuous casting and rolling method of a common low-carbon steel medium plate according to claim 1, characterized in that: the low-carbon steel comprises the following chemical components in percentage by mass: c is less than or equal to 0.25 percent, Si is less than or equal to 0.5 percent, Mn: 0.8 to 2 percent of Fe, less than or equal to 0.04 percent of P, less than or equal to 0.04 percent of S, less than or equal to 0.01 percent of Nb, less than or equal to 0.1 percent of Ti, less than or equal to 0.4 percent of Cr, less than or equal to 0.4 percent of Ni, less than or equal to 0.3 percent of Cu, less than or equal to 0.3 percent of Mo, and the balance of Fe and inevitable impurities.
4. The continuous casting and rolling method of a common low-carbon steel medium plate as claimed in claim 3, wherein: the low-carbon steel comprises the following chemical components in percentage by mass: c: 0.20-0.25%, Si: 0.1-0.4%, Mn: 1.0 to 1.6 percent of Fe, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, less than or equal to 0.01 percent of Nb, less than or equal to 0.1 percent of Ti, less than or equal to 0.15 percent of Cr, less than or equal to 0.1 percent of Ni, less than or equal to 0.1 percent of Cu, less than or equal to 0.1 percent of Mo, and the balance of Fe and inevitable impurities.
5. The continuous casting and rolling method of a common low-carbon steel medium plate according to claim 1, characterized in that: checking the surface quality of the steel billet before charging, and cleaning up the steel billet if burrs exist; the defects of no allowance of cracks and large-area unevenness need to be detected before the billet is put into the heating furnace.
6. The continuous casting and rolling method of a common low-carbon steel medium plate according to claim 1, characterized in that: the rolling needs to be carried out by using a reciprocating medium plate rolling mill, and the rolled piece is insulated in the rolling process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210058870.9A CN114406000A (en) | 2022-01-19 | 2022-01-19 | Continuous casting and rolling method for common low-carbon steel medium plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210058870.9A CN114406000A (en) | 2022-01-19 | 2022-01-19 | Continuous casting and rolling method for common low-carbon steel medium plate |
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| Publication Number | Publication Date |
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| CN114406000A true CN114406000A (en) | 2022-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210058870.9A Pending CN114406000A (en) | 2022-01-19 | 2022-01-19 | Continuous casting and rolling method for common low-carbon steel medium plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115537636A (en) * | 2022-09-23 | 2022-12-30 | 南京钢铁股份有限公司 | Method for improving rolling efficiency of A32-grade marine medium plate |
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2022
- 2022-01-19 CN CN202210058870.9A patent/CN114406000A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115537636A (en) * | 2022-09-23 | 2022-12-30 | 南京钢铁股份有限公司 | Method for improving rolling efficiency of A32-grade marine medium plate |
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