CN112474792B - Cogging rolling production method for industrial pure iron - Google Patents
Cogging rolling production method for industrial pure iron Download PDFInfo
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- CN112474792B CN112474792B CN202011155739.1A CN202011155739A CN112474792B CN 112474792 B CN112474792 B CN 112474792B CN 202011155739 A CN202011155739 A CN 202011155739A CN 112474792 B CN112474792 B CN 112474792B
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- rolling
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- blank
- cogging
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- 238000005096 rolling process Methods 0.000 title claims abstract description 71
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000002791 soaking Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000009749 continuous casting Methods 0.000 claims abstract description 12
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 230000002441 reversible effect Effects 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000005336 cracking Methods 0.000 description 8
- 239000011572 manganese Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Classifications
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/06—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a non-continuous process, e.g. triplet mill, reversing mill
-
- 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
-
- 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
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B2001/022—Blooms or billets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a cogging and rolling production method for industrial pure iron, belonging to the technical field of steel rolling cogging production in the metallurgical industry. The technical scheme is as follows: comprises the following process steps: (1) cutting the continuous casting plate blank into a plurality of rectangular blanks along the length direction; (2) heating the cut rectangular blank, wherein the temperature of a preheating section of a heating furnace is 600-900 ℃, the temperature of a soaking section is 1270-1280 ℃, and the soaking time is 90-100min; (3) rolling the heated rectangular blank, wherein the rolling passes are five or more, the rolling temperature of the first pass is 1200-1210 ℃, the rolling temperature of the second pass is 1180-1190 ℃, the rolling temperature of the third pass is 1140-1160 ℃, the rolling temperature of the fourth pass is 1110-1130 ℃, and the rolling temperature of the fifth pass is 1080-1100 ℃. The invention has the beneficial effects that: the crack defect of the corner part in the cogging process can be avoided.
Description
Technical Field
The invention relates to a cogging and rolling production method for industrial pure iron, belonging to the technical field of steel rolling cogging production in the metallurgical industry.
Background
The industrial pure iron is special steel with the purity not less than 99.8 percent, is an important basic material in the electronic industry, the national defense industry and the new energy industry, and is widely used for manufacturing soft magnetic materials, electromagnetic devices, amorphous materials, metal composite materials and the like. The industrial pure iron belongs to the steel grades of ultra-low carbon, ultra-low phosphorus, ultra-low manganese and ultra-low sulfur, and the higher the purity is, the more excellent the performance is.
During the cogging rolling process, the corner of the casting blank is easy to have crack defects. The main reasons are the following: 1) In the process of heating a casting blank and then deforming in a rolling mill, the temperature drop of four corners is larger than that of other parts, different phase regions appear at the corners and other parts, and the thermoplasticity of the four corners and other parts is obviously different. 2) The pure iron has low Mn content and low Mn/S content, and does not have enough Mn to fix S, so that iron-rich sulfides in an austenite state are increased, the bonding force of a grain boundary is reduced, and grain microcracks are formed at the corner parts of a casting blank.
Disclosure of Invention
The invention aims to provide a cogging rolling production method of industrial pure iron, which can avoid the defect of cracks at the corner of a casting blank in the cogging process and solve the problems in the background technology.
The technical scheme of the invention is as follows:
a cogging rolling production method of industrial pure iron comprises the following process steps:
(1) the method comprises the following steps of (1) cutting a continuous casting slab into a plurality of rectangular blanks along the length direction by adopting a continuous casting slab as a raw material;
(2) conveying the cut rectangular blank to a heating furnace for heating, wherein the temperature of a preheating section of the heating furnace is 600-900 ℃, the temperature of a soaking section is 1270-1280 ℃, and the soaking time is 90-100min;
(3) rolling the heated rectangular billet by using a reversible rolling mill, wherein the rolling pass is five or more, and the rolling pass is as follows: the rolling temperature of the first pass is 1200-1210 ℃, the rolling temperature of the second pass is 1180-1190 ℃, the rolling temperature of the third pass is 1140-1160 ℃, the rolling temperature of the fourth pass is 1110-1130 ℃ and the rolling temperature of the fifth pass is 1080-1100 ℃.
And the temperature of the rectangular blank is required to be kept for 30-35 seconds when the rectangular blank enters the third pass from the second pass and enters the fourth pass from the third pass.
The specification of the continuous casting plate blank is 240mm multiplied by 1200mm multiplied by 8980mm, and three rectangular blanks of 240mm multiplied by 395mm multiplied by 8980mm are cut.
And rolling the rectangular blank into 150mm square steel by ten passes.
The invention has the beneficial effects that: the heating temperature of the rectangular blank and the rolling temperature of each pass are reasonably controlled, and the waiting time of the rectangular blank before entering the third pass and the fourth pass is controlled, so that the temperature of the rectangular blank is equalized, the temperature of the corner is returned, and the crack defect of the corner in the cogging process is avoided.
Detailed Description
An industrial pure iron cogging rolling production method comprises the following process steps:
(1) the method comprises the following steps of (1) cutting a continuous casting slab into a plurality of rectangular blanks along the length direction by adopting a continuous casting slab as a raw material;
(2) conveying the cut rectangular blank to a heating furnace for heating, wherein the temperature of a preheating section of the heating furnace is 600-900 ℃, the temperature of a soaking section is 1270-1280 ℃, and the soaking time is 90-100min;
(3) rolling the heated rectangular billet by using a reversible rolling mill, wherein the rolling pass is five or more, and the rolling pass is as follows: the rolling temperature of the first pass is 1200-1210 ℃, the rolling temperature of the second pass is 1180-1190 ℃, the rolling temperature of the third pass is 1140-1160 ℃, the rolling temperature of the fourth pass is 1110-1130 ℃, and the rolling temperature of the fifth pass is 1080-1100 ℃.
In this embodiment, the specifications of the continuous casting slab are: 240mm × 1200mm × 8980mm, cut into three rectangular blanks 240mm × 395mm × 8980mm, and the finished product size: 150mm square steel.
The reversible rolling mill is divided into a front rolling mill and a rear rolling mill, each rolling mill rolls five times for ten times, wherein the temperature of the rolling mill for the first five times is only controlled, and the temperature needs to be kept for 30-35 seconds before the rolling mill for the third time and the rolling mill for the second time, so that the temperature of the continuous casting billet is equalized, and the corner is cooled again.
The continuous casting slab usually has chamfers at two sides, after the slab is cut into three rectangular blanks, the rectangular blank in the middle has no chamfers, one side of the rectangular blank at two sides has chamfers, and the side of the rectangular blank with the chamfers faces upwards in the steel loading process of the rectangular blank, so that the chamfers of the rectangular blank are ensured to be on the upper surface when the rectangular blank enters a rolling mill, and the inclination phenomenon can be avoided in the rolling process.
The industrial pure iron is suitable for producing the brand YT 1.
Example 1
Adopting a rectangular blank with 240mm × 395mm section after the plate blank is cut, wherein the casting blank has no arc surface, the temperature of the preheating section of the heating furnace is 600-900 ℃, the temperature of the soaking section is 1230-1270 ℃, and the soaking time is 60min. And (3) opening the high-pressure descaling water for the casting blank, and cogging and rolling the casting blank into 150mm square steel with the cracking proportion of 100%.
Example 2
Adopting a rectangular blank with 240mm × 395mm section after the plate blank is cut, wherein the casting blank has no arc surface, the temperature of the preheating section of the heating furnace is 600-900 ℃, the temperature of the soaking section is 1150-1180 ℃, and the soaking time is 80min. And (3) opening the high-pressure descaling water for the casting blank, and cogging and rolling the casting blank into 150mm square steel with the cracking proportion of 100%.
Example 3
Adopting a rectangular blank with 240mm × 395mm section after the plate blank is cut, wherein the casting blank has no arc surface, the temperature of the preheating section of the heating furnace is 600-900 ℃, the temperature of the soaking section is 1270 ℃, and the soaking time is 90min. And closing the high-pressure descaling water of the casting blank. Rolling for 10 seconds before entering the 3 rd and 4 th lanes. The cogging is rolled into 150mm square steel with 40 percent of cracking.
Example 4
Adopting a rectangular blank with 240mm × 395mm section after the plate blank is cut, wherein the casting blank has no arc surface, the temperature of the preheating section of the heating furnace is 600-900 ℃, the temperature of the soaking section is 1270 ℃, and the soaking time is 100min. And closing the high-pressure descaling water of the casting blank. Rolling for 30 seconds before entering the 3 rd and 4 th lanes.
The cogging is rolled into 150mm square steel, and the cracking proportion is 10%.
Example 5
Adopting a rectangular blank with 240mm × 395mm section after the plate blank is cut, wherein the casting blank has no arc surface, the temperature of the preheating section of the heating furnace is 600-900 ℃, the temperature of the soaking section is 1280 ℃, and the soaking time is 100min. And closing the high-pressure descaling water of the casting blank. Rolling for 35 seconds before entering the 3 rd and 4 th lanes.
The cogging is rolled into 150mm square steel with a cracking proportion of 9%.
Example 6
Adopting a rectangular blank with 240mm × 395mm section after the plate blank is cut, wherein the casting blank has no arc surface, the temperature of the preheating section of the heating furnace is 600-900 ℃, the temperature of the soaking section is 1280 ℃, and the soaking time is 100min. And closing the high-pressure descaling water of the casting blank. Rolling for 35 seconds before entering the 3 rd and 4 th lanes. The water content of the rolling groove of the rolling mill is 50 percent.
The cogging is rolled into 150mm square steel, and the cracking proportion is 8%.
Example 7
Adopting a rectangular blank with 240mm × 395mm section after the plate blank is cut, wherein the casting blank has no arc surface, the temperature of the preheating section of the heating furnace is 600-900 ℃, the temperature of the soaking section is 1280 ℃, and the soaking time is 100min. And closing the high-pressure descaling water of the casting blank. Rolling for 35 seconds before entering the 3 rd and 4 th lanes. The water content of the rolling groove of the BD1 rolling mill is up to 30 percent.
The cogging is rolled into 150mm square steel, and the cracking proportion is 3 percent.
Example 8
Adopting a rectangular blank with 240mm × 395mm section after the plate blank is cut, wherein the casting blank has no arc surface, the temperature of the preheating section of the heating furnace is 600-900 ℃, the temperature of the soaking section is 1280 ℃, and the soaking time is 100min. And closing the high-pressure descaling water of the casting blank. Rolling for 35 seconds before entering the 3 rd and 4 th lanes. The water content of the rolling groove of the BD1 rolling mill is 10 percent.
The cogging is rolled into 150mm square steel with a cracking proportion of 3 percent.
Claims (2)
1. A cogging rolling production method of industrial pure iron is characterized by comprising the following steps: comprises the following process steps:
(1) the method comprises the following steps of (1) adopting a continuous casting slab as a raw material, wherein the specification of the continuous casting slab is 240mm multiplied by 1200mm multiplied by 8980mm, and cutting the continuous casting slab into three rectangular blanks of 240mm multiplied by 395mm multiplied by 8980mm along the length direction;
(2) conveying the cut rectangular blank to a heating furnace for heating, wherein the temperature of a preheating section of the heating furnace is 600-900 ℃, the temperature of a soaking section is 1270-1280 ℃, and the soaking time is 90-100min;
(3) rolling the heated rectangular blank by using a reversible rolling mill, wherein the rolling passes are more than five, and the method comprises the following steps: the rolling temperature of the first pass is 1200-1210 ℃, the rolling temperature of the second pass is 1180-1190 ℃, the rolling temperature of the third pass is 1140-1160 ℃, the rolling temperature of the fourth pass is 1110-1130 ℃, the rolling temperature of the fifth pass is 1080-1100 ℃, and the temperature of the rectangular blank is required to be kept for 30 seconds-35 seconds when the rectangular blank enters the third pass from the second pass and enters the fourth pass from the third pass.
2. The cogging rolling production method of industrial pure iron according to claim 1, characterized in that: and the rectangular billet is rolled into square steel with the cross section of 150mm by ten times.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011155739.1A CN112474792B (en) | 2020-10-26 | 2020-10-26 | Cogging rolling production method for industrial pure iron |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011155739.1A CN112474792B (en) | 2020-10-26 | 2020-10-26 | Cogging rolling production method for industrial pure iron |
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| Publication Number | Publication Date |
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| CN112474792A CN112474792A (en) | 2021-03-12 |
| CN112474792B true CN112474792B (en) | 2023-03-24 |
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| CN114632816B (en) * | 2022-02-18 | 2024-02-23 | 包头钢铁（集团）有限责任公司 | Heating and rolling method for industrial pure iron |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2088764B (en) * | 1980-12-04 | 1984-11-21 | Nippon Steel Corp | Rolling steel bar or rod |
| CN102247985B (en) * | 2011-07-01 | 2013-06-26 | 河北省首钢迁安钢铁有限责任公司 | Method for producing steel for stirring tank with limit specification through hot rolling |
| CN103484643B (en) * | 2013-08-23 | 2015-04-15 | 安阳钢铁股份有限公司 | Method for preventing hot rolling edge fractures in oriented silicon steel |
| CN105839028B (en) * | 2015-01-12 | 2017-07-28 | 宝钢特钢有限公司 | Austenite heat-resistance Valve Steel manufacture method |
| EP3587610B1 (en) * | 2017-04-27 | 2022-07-06 | JFE Steel Corporation | Hot-rolled and annealed ferritic stainless steel sheet, and method for manufacturing same |
| CN108677084B (en) * | 2018-04-08 | 2020-11-03 | 敬业钢铁有限公司 | Production method of low-inclusion clean steel |
| CN109332379B (en) * | 2018-12-06 | 2020-10-23 | 唐山市德龙钢铁有限公司 | Hot-rolled narrow strip steel for stamping parts and preparation method and application thereof |
| CN109825763B (en) * | 2019-01-23 | 2021-04-30 | 邢台钢铁有限责任公司 | Industrial pure iron for high-conductivity cathode flat steel and production method thereof |
| CN109940043B (en) * | 2019-04-09 | 2020-07-03 | 唐山市德龙钢铁有限公司 | Preparation method of hot rolled strip steel easy to pickle |
| CN110180895B (en) * | 2019-05-28 | 2021-05-14 | 北京首钢股份有限公司 | Method for solving edge linear defect of hot-rolled high-carbon alloy steel |
| CN111195651B (en) * | 2020-02-13 | 2021-08-13 | 鞍山紫竹科技型钢有限公司 | Rolling process of hot-rolled U-shaped steel sheet pile |
| CN111349853B (en) * | 2020-03-02 | 2021-08-10 | 河北津西钢铁集团股份有限公司 | Rolling method for hot-rolled H-shaped steel by microalloy treatment |
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