CN112658029B - Hot rolled steel strip performance control process for welded gas cylinder - Google Patents
Hot rolled steel strip performance control process for welded gas cylinder Download PDFInfo
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Abstract
The invention discloses a hot-rolled steel strip performance control process for a welded gas cylinder, which comprises the steps of heating a plate blank, rough rolling, finish rolling, laminar cooling and slow cooling, and specifically comprises the following steps: heating the plate blank, wherein the tail of the plate blank is 10-20 ℃ higher than the head of the plate blank; a heat-insulating cover is used between the rough rolling unit and the finish rolling unit; fine rolling, wherein the final rolling temperature is controlled to be 900-930 ℃; laminar cooling, wherein the hot head and hot tail control is adopted in the laminar cooling process, the coiling temperature of the steel strip head part with the length of 3m to 5m is increased by 30 ℃ on the basis of the controlled coiling temperature of the steel strip, the coiling temperature of the steel strip tail part with the length of 10m to 20m is increased by 20 ℃ on the basis of the controlled coiling temperature of the steel strip, and the coiling temperature of the steel strip is controlled to be 630-670 ℃; and (5) slowly cooling, namely, after the steel coil is off line, entering a slow cooling pit for slow cooling for 48 hours. According to the process, the uniformity and stability of the performance of the steel strips in the same batch of the through-rolling process are realized through the slab head and tail heating temperature control, the finishing mill inlet heat preservation measure, the finish rolling temperature control, the coiling temperature control and the steel coil slow cooling process.
Description
Technical Field
The invention belongs to the technical field of steel manufacturing, and particularly relates to a performance control process of a hot-rolled steel strip for a welded gas cylinder.
Background
The hot rolled steel strip for welding the gas cylinder has larger performance difference in coil passing strength due to different residual stresses generated by head and tail rolling of the steel strip and different temperature field distributions in the cooling process of the steel coil. The tensile strength difference is about 40MPa generally, and the tensile strength performance difference of the steel coils in the same batch is about 50MPa generally; the yield ratio is usually between 0.7 and 0.8, and the yield ratio is more than 0.8 at the head and tail ends.
The chinese patent document with the patent application number 201210567654.3 discloses a method for improving the uniformity of the performance of a steel coil for Ti microalloyed high-strength machinery, and the uniformity of the performance of a final product in the rolling direction is improved by adopting a U-shaped cooling mode in the cooling process. By adopting the induction heating of the edge part of the intermediate blank, the uniformity of the transverse performance of the final product is improved. However, the method aims at the research of Ti microalloyed steel strips, has higher requirements on the control precision of equipment, and does not research and describe the yield ratio of materials.
The Chinese patent document with the patent application number of 201210336652.3 discloses a production method for improving the uniformity of the strip steel coil passing mechanical properties, and better coil passing performance is relatively uniform by optimizing technological parameters in a rolling process and a U-shaped coiling process in a cooling process. However, the method adopts a hot rolling and cold rolling process method to improve the uniformity of the coil passing performance of the product, and meanwhile, the yield ratio of the material is not researched and elucidated.
The Chinese patent document with the patent application number of 201310738707.8 discloses a manufacturing process of a hot rolled steel plate coil for a welded gas cylinder, and explains a manufacturing process of the hot rolled steel plate coil for the welded gas cylinder. But the method can not effectively control the uniformity of the head and the tail properties of the steel strip.
Disclosure of Invention
The invention aims to provide a control process for improving the uniformity of the coil passing performance of a steel strip for a welded gas cylinder by optimizing rolling process parameters and a slow cooling process.
In order to achieve the purpose, the invention adopts the technical scheme that:
a hot-rolled steel strip performance control process for a welded gas cylinder comprises slab heating, rough rolling, finish rolling, laminar cooling and slow cooling, and specifically comprises the following steps:
heating the plate blank, wherein the tail of the plate blank is 10-20 ℃ higher than the head of the plate blank;
a heat-insulating cover is used between the rough rolling unit and the finish rolling unit, so that the temperature reduction of the tail part of the steel strip is slowed down, and the internal stress difference of the head and the tail of the steel strip caused by different rolling temperatures is improved;
finish rolling, wherein the finish rolling temperature is controlled to be 900-930 ℃, the internal stress is reduced by increasing the finish rolling temperature, and the yield ratio is reduced by utilizing a mechanism that the internal stress has greater influence on the yield strength;
laminar cooling, wherein the hot head and the hot tail are adopted for control in the laminar cooling process, the coiling temperature of the length of 3 m-5 m at the head of the steel strip is increased by 30 ℃ on the basis of the controlled coiling temperature of the steel strip, the coiling temperature of the length of 10 m-20 m at the tail of the steel strip is increased by 20 ℃ on the basis of the controlled coiling temperature of the steel strip, and the coiling temperature of the steel strip is controlled at 630-670 ℃;
and (4) slow cooling, namely, after the steel coil is off line, entering a slow cooling pit for slow cooling for 48 hours, and performing slow cooling by adopting the slow cooling pit, homogenizing crystal grains, reducing internal stress, improving the coiling performance uniformity and reducing the yield ratio.
Further, the heating temperature of the head of the plate blank is 1230 DEG 20 ℃, the heating temperature of the tail of the plate blank is 1250 DEG 20 ℃, and the heating time is 120-210 min.
Further, when the environmental temperature is higher than 20 ℃, the coiling temperature of the steel strip is controlled to be 630-650 ℃; when the environmental temperature is less than or equal to 20 ℃, the coiling temperature of the steel strip is controlled to be 650-670 ℃, and the performance stability of the steel strip for welding the gas cylinder is further improved by optimizing the coiling temperature.
Further, the temperature of the steel rolling into the slow cooling pit is 500-650 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the uniformity and stability of the performance of the steel strip for welding the gas cylinders in the same batch through rolling are realized through the control of the heating temperature of the head and the tail of the plate blank, the heat preservation measure of the heat preservation cover at the inlet of the finishing mill, the control of the finish rolling temperature, the control of the coiling temperature and the slow cooling process of the steel coil.
2. The tensile strength coil-passing performance difference of the steel belt for the welded gas cylinder produced by adopting the control process is basically controlled within 20 MPa.
3. The tensile property of the steel coils in the same batch for the welded gas cylinder produced by the control process is basically controlled within 30 MPa.
4. The yield ratio of the steel strip for the welded gas cylinder produced by adopting the control process of the invention is basically stabilized between 0.70 and 0.77, and the difference of the yield ratios of the head and the tail is small.
Detailed Description
The technical solutions and effects of the present invention are further described below with reference to specific examples, but the scope of the present invention is not limited thereto.
Example 1
The slab of the embodiment comprises the following chemical components: c:0.16wt%, si:0.03wt%, mn:0.88wt%, P:0.008wt%, S:0.008wt%, alt:0.035wt%, and the balance of Fe and other trace elements.
3X 1155X Cmm specification HP295 is produced by using 210X 1180X 10500mm of blank specification.
Heating the plate blank: the head is 1235 ℃, the tail is 1250 ℃, and the heating time is 150min; a heat preservation cover is arranged between the rough rolling unit and the finishing rolling unit; the finishing temperature is 923 ℃; steel strip final cooling temperature: 670 ℃ (environment temperature is 12 ℃), the coiling temperature of the 4m position of the head of the steel strip is 700 ℃, and the coiling temperature of the 12m position of the tail of the steel strip is 690 ℃; the steel coil enters a slow cooling pit for 48 hours at the temperature of 620 ℃ and then is sampled and inspected. And (3) rolling 20 batches in total, uncoiling the batch with the highest strength and the batch with the lowest strength, and taking a sample for testing every 5m at the tail end and the head end of the steel coil, wherein the position is about 20m away from the head of the steel strip and is the position with the lowest coiling performance according to the test result, and therefore the position is taken every 100m, and the position is taken every 50m, and the position is taken every 5m, and the lowest value and the highest value are shown in the table 1.
TABLE 1 Properties of the samples of this example
The tensile strength coil-through performance difference of the steel strip for the welded gas cylinder produced by the performance control process of the hot rolled steel strip for the welded gas cylinder in the embodiment is 12MPa, the performance of the steel coil in the same batch is basically controlled to be 21MPa, and the yield ratio of the steel strip is stabilized between 0.71 and 0.77. In a word, the performance control process of the hot-rolled steel strip for the welded gas cylinder in the embodiment is adopted to realize the uniformity and stability of the performance of the steel strip for the welded gas cylinder in the same batch.
Example 2
The slab of this example had the following chemical composition: c:0.17wt%, si:0.06wt%, mn:0.86wt%, P:0.006wt%, S:0.007wt%, alt:0.038wt%, the balance being Fe and other trace elements.
3X 1155X Cmm HP295 is produced from 210X 1180X 10300mm billets.
Heating a plate blank: the head is 1240 ℃, the tail is 1260 ℃, and the heating time is 160min; the finish rolling temperature is 918 ℃; steel strip final cooling temperature: the temperature of 640 ℃ (the ambient temperature is 33 ℃), the final cooling temperature of 5m at the head of the steel strip is 670 ℃, and the final cooling temperature of 15m at the tail of the steel strip is 660 ℃; and (3) taking a steel coil for 48 hours after the steel coil enters a slow cooling pit at 600 ℃. And (3) rolling 20 batches in total, uncoiling and sampling the batch with the highest strength and the batch with the lowest strength, and taking a sample with the lowest whole coiling performance at a position which is about 20m away from the head of the steel strip according to the inspection result, so that every 100m is taken at the tail end of the steel coil, 50m is taken at the head end of the steel coil, and every 5m is taken for inspection, wherein the lowest value and the highest value are shown in the table 2.
TABLE 2 Properties of the samples of this example
The tensile strength coil-through performance difference of the steel strip for the welded gas cylinder produced by the performance control process of the hot rolled steel strip for the welded gas cylinder in the embodiment is 17MPa, the performance of the steel coil in the same batch is basically controlled to be 15MPa, and the yield ratio of the steel strip is stabilized between 0.71 and 0.76. In a word, the performance control process of the hot rolled steel strip for the welded gas cylinders realizes the uniformity and stability of the performance of the steel strip for the welded gas cylinders in the same batch of coils.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. The control process for improving the uniformity of the coiling performance of the steel belt HP295 for the welded gas cylinder is characterized in that the chemical components of a steel belt HP295 for the welded gas cylinder are as follows: c:0.17wt%, si:0.06wt%, mn:0.86wt%, P:0.006wt%, S:0.007wt%, alt:0.038wt%, the balance being Fe and other trace elements;
the process comprises slab heating, rough rolling, finish rolling, laminar cooling and slow cooling, and specifically comprises the following steps:
heating the plate blank, wherein the tail part of the plate blank is 20 ℃ higher than the head part of the plate blank, the head part is 1240 ℃, the tail part is 1260 ℃, and the heating time is 160min;
a heat-insulating cover is used between the rough rolling unit and the finish rolling unit;
fine rolling, wherein the finish rolling temperature is controlled at 918 ℃;
laminar cooling, wherein hot head and hot tail control is adopted in the laminar cooling process, the coiling temperature of the 5m length of the head part of the steel strip is increased by 30 ℃ on the basis of the controlled coiling temperature of the steel strip and is 670 ℃, the coiling temperature of the 15m length of the tail part of the steel strip is increased by 20 ℃ on the basis of the controlled coiling temperature of the steel strip and is 660 ℃, the coiling temperature of the steel strip is 640 ℃, and the environmental temperature is 33 ℃;
slowly cooling, namely slowly cooling the steel coil in a slow cooling pit for 48 hours at 600 ℃ after the steel coil is off line;
the tensile strength coil-passing performance difference of the steel strip for the welded gas cylinder produced by the control process is 17MPa, the performance of the steel coil in the same batch is controlled to be 15MPa, and the yield ratio of the steel strip is stabilized between 0.73 and 0.75.
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| CN113862577B (en) * | 2021-10-12 | 2022-08-05 | 新疆八一钢铁股份有限公司 | Production method of high-strength low-yield-ratio welded gas cylinder steel |
| CN115418575A (en) * | 2022-10-21 | 2022-12-02 | 重庆钢铁股份有限公司 | High-precision low-yield-ratio steel belt for HP295 welded gas cylinder and production method thereof |
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