CN114160580A - Cooling method for improving flatness of weathering steel A709Gr50 - Google Patents
Cooling method for improving flatness of weathering steel A709Gr50 Download PDFInfo
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- CN114160580A CN114160580A CN202111385417.0A CN202111385417A CN114160580A CN 114160580 A CN114160580 A CN 114160580A CN 202111385417 A CN202111385417 A CN 202111385417A CN 114160580 A CN114160580 A CN 114160580A
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- 238000001816 cooling Methods 0.000 title claims abstract description 36
- 229910000870 Weathering steel Inorganic materials 0.000 title claims abstract description 27
- 238000005096 rolling process Methods 0.000 claims abstract description 59
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 12
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 10
- 238000012797 qualification Methods 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of 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
- B21B37/76—Cooling control on the run-out table
-
- 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
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/04—Flatness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/20—End shape; fish tail; tongue
Abstract
The invention discloses a cooling method for improving the flatness of weathering steel A709GR50, which relates to the technical field of steel production, and comprises the following chemical components in percentage by mass: 0.04-0.12%, Mn: 1.0% -1.5%, Si: 0.30-0.60%, Cr: 0.35-0.60%, Cu: 0.20-0.45%, Ni: 0.05 to 0.15 percent, no Ca, and the balance of Fe and inevitable impurities. After rolling, ultra-fast cold water cooling is adopted, the collecting pipes are opened for 6-10 groups, the water ratio is 1.4-1.9, the tail part has a shielding function, meanwhile, the water feeding of the 1 st group is manually closed, the problem that the tail part buckles and the like due to the fact that the upper surface is too cold is reduced, the steel plate flatness is less than or equal to 6mm/2m, the one-time pass rate of weather-resistant steel plate types is improved by 16%, the production cost is reduced, the delivery speed of the steel plate is improved, and the customer satisfaction and the market comprehensive competitiveness are improved.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a cooling method for improving the straightness of weathering steel A709GR 50.
Background
At present, the vertical type of a header nozzle on the ultra-fast cooling equipment is arranged, the lower header nozzle is obliquely arranged and is 30 degrees relative to the vertical direction, when the weathering steel is subjected to ultra-fast cooling water cooling, the tail part can be unevenly deformed and deformed due to the fact that a lower header water column is sprayed to the upper surface of the tail part, the tail part buckling is generated, the unevenness of the tail part is 11-15mm/2m, the thermal straightening cannot be effectively leveled, the later stage is required to be leveled and saved through a flattening machine, and the buckling generation rate of the tail part is about 30 percent.
In order to reduce the production cost and improve the satisfaction degree of customers on the shape of the weathering steel plate, a cooling method for improving the flatness of the weathering steel A709Gr50 needs to be developed on the premise of ensuring the production efficiency.
Disclosure of Invention
The invention aims at the technical problems, overcomes the defects of the prior art, and provides a cooling method for improving the straightness of weathering steel A709GR50, which comprises the following steps:
1) heating the plate blank in a heating furnace for 0.75-1.5 min/mm at 1190-1230 ℃ and the temperature uniformity of the plate blank is less than or equal to 15 ℃;
2) removing scale for 1 time by a scale removing box after the plate blank is taken out of the furnace;
3) the rolling mill adopts single-billet, double-billet or multi-billet rolling, the rolling adopts even pass rolling, and the last pass leveling function is used;
4) controlling the initial rolling temperature to be above 1050 ℃, and descaling the rough rolling mill for 2-3 times;
5) the initial rolling temperature of the second stage is less than or equal to 830 ℃, the thickness ratio of the intermediate billet is more than or equal to 1.7, the finish rolling mill descales for 2-3 times, the rolling speed is 1.5-3.0 m/s, the last pass flattening speed is 1.0m/s, and the final rolling temperature is 810-850 ℃;
6) after the steel plate is discharged from the rolling mill, the steel plate is cooled by ultra-fast cooling, 6-10 groups of collecting pipes are opened, the water ratio is 1.4-1.9, the roller speed is 0.5-1.2 m/s, and the acceleration is 0.003-0.008 m/s2Applying a tail shielding function, wherein the shielding amount is 70-90%, the tail shielding length is 2-5 m, manually closing the water feeding of the group 1, and the temperature of red return is 640-680 ℃;
7) straightening for 1-3 times by using a hot straightening machine after cooling, wherein the straightening force is 10000-20000 KN;
8) the steel plate is put in storage after being subjected to edge cutting, sampling, sizing, surface inspection and flaw detection qualification;
9) and (4) delivering the steel plate after the performance detection is qualified.
The technical scheme of the invention is further defined as follows:
according to the cooling method for improving the flatness of the weathering steel A709GR50, after the step 4), the intermediate blank is properly soaked in water for 2-6 times.
The cooling method for improving the straightness of the weathering steel A709GR50 comprises the following chemical components in percentage by mass: 0.04-0.12%, Mn: 1.0% -1.5%, Si: 0.30-0.60%, Cr: 0.35-0.60%, Cu: 0.20-0.45%, Ni: 0.05 to 0.15 percent, no Ca, and the balance of Fe and inevitable impurities.
The cooling method for improving the straightness of the weathering steel A709GR50 comprises the following chemical components in percentage by mass: 0.05 to 0.11 percent, Mn: 1.05-1.40%, Si: 0.35-0.55%, Cr: 0.40-0.55%, Cu: 0.25% -0.40%, Ni: 0.06 to 0.14 percent, no Ca, and the balance of Fe and inevitable impurities.
The cooling method for improving the straightness of the weathering steel A709GR50 comprises the following chemical components in percentage by mass: 0.06% -0.10%, Mn: 1.1% -1.35%, Si: 0.35-0.50%, Cr: 0.45-0.55%, Cu: 0.25% -0.35%, Ni: 0.07 to 0.13 percent, no Ca is added, and the balance is Fe and inevitable impurities.
The cooling method for improving the straightness of the weathering steel A709GR50 comprises the following chemical components in percentage by mass: 0.07-0.09%, Mn: 1.1% -1.25%, Si: 0.40-0.50%, Cr: 0.48-0.55%, Cu: 0.26-0.35%, Ni: 0.08 to 0.13 percent, no Ca is added, and the balance is Fe and inevitable impurities.
The cooling method for improving the flatness of the weathering steel A709GR50 comprises the following steps: the thickness is 50-100 mm, and the width is 2000-4500 mm.
The invention has the beneficial effects that: the component design of the invention meets the requirements of the tubular pile plate and reaches the design standard of weathering resistant steel; the tail shielding function and manual closing of the water feeding of the group 1 are utilized, the bad plate types such as tail buckling and the like caused by the supercooling of the upper surface of the tail are reduced, the straightness of a steel plate is less than or equal to 6mm/2m, and the cooling uniformity of the upper surface and the lower surface is improved; on the premise of ensuring the production efficiency, the production cost is not increased, and the one-time qualification rate of the weather-resistant steel plate type is improved by 16 percent; the contract exchange rate of the weather-resistant plate is improved, the contract delivery date is integrally advanced by 2 days, the dissatisfaction risk of plate type incompatibility is reduced, and the comprehensive satisfaction degree of customers is improved.
Drawings
FIGS. 1 to 5 are metallographic structure diagrams of examples.
Detailed Description
Example 1
The cooling method for improving the flatness of the weathering steel a709GR50 provided in this embodiment comprises the following chemical components by mass percent: c: 0.076%, Mn: 1.159%, Si: 0.465%, Cr: 0.504%, Cu: 0.272%, Ni: 0.102%, Ca is not added, and the balance is Fe and inevitable impurities.
The method for producing the 40 by 3000mm weathering steel A709Gr50 by using the 260 by 2770mm blank comprises the following steps:
1) heating the plate blank in a heating furnace for 0.78min/mm at 1198 ℃ and 2 ℃ for uniformity;
2) after the plate blank is taken out of the furnace, descaling for 1 time by a descaling box, and removing scale on the surface of the blank;
3) the rolling mill adopts double-blank rolling, the rolling adopts even pass rolling, and the rolling mill has the function of flattening the last pass;
4) controlling the initial rolling temperature at 1068 ℃, roughly rolling for 1/2/5 times to remove scale, and removing secondary iron scale;
5) the intermediate blank is penetrated with water for 2 times so as to improve the production efficiency;
6) the initial rolling temperature of the second stage is 818 ℃, the thickness ratio of the intermediate billet is 2.48, 2 times of descaling are carried out before finish rolling, secondary iron scale is removed, the rolling speed is 1.5-2.5 m/s, the final pass flattening speed is 1.0m/s, and the final rolling temperature is 831 ℃;
7) after the steel plate is taken out of the rolling mill, the steel plate is cooled by ultra-fast cooling, 6 groups of collecting pipes are opened, the water ratio is 1.5, the roller speed is 0.8m/s, and the acceleration is 0.007m/s2Applying a tail shielding function, wherein the shielding amount is 85 percent, the tail shielding length is 3m, manually closing the water feeding of the group 1, and the temperature of the red returning is 679 ℃;
8) straightening for 2 times by using a hot straightening machine after cooling, wherein the straightening force is 12240KN, and the integral plate shape of the steel plate is ensured;
9) the steel plate is put in storage after being subjected to edge cutting, sampling, sizing, surface inspection and flaw detection qualification;
10) and (4) delivering the steel plate after the performance detection is qualified.
Example 2
The cooling method for improving the straightness of weathering steel A709Gr50 provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.078%, Mn: 1.155%, Si: 0.444%, Cr: 0.522%, Cu: 0.288%, Ni: 0.091%, no Ca, and the balance Fe and inevitable impurities.
The method for producing 45 x 3000mm weathering steel A709Gr50 by using a 260 x 2770mm blank comprises the following steps:
1) heating the plate blank in a heating furnace for 1.11min/mm at 1194 ℃ and 5 ℃ for uniformity;
2) after the plate blank is taken out of the furnace, descaling for 1 time by a descaling box, and removing scale on the surface of the blank;
3) the rolling mill adopts double-blank rolling, the rolling adopts even pass rolling, and the rolling mill has the function of flattening the last pass;
4) controlling the initial rolling temperature at 1062 ℃, rough rolling for 1/2/5 times of descaling, and removing secondary iron scale;
5) the intermediate blank is penetrated with water for 3 times so as to improve the production efficiency;
6) the initial rolling temperature of the second stage is 814 ℃, the thickness ratio of the intermediate billet is 2.02, the secondary scale is removed by 2 times of descaling before finish rolling, the rolling speed is 1.5-2.5 m/s, the last leveling speed is 1.0m/s, and the final rolling temperature is 828 ℃;
7) after the steel plate is taken out of the rolling mill, the steel plate is cooled by ultra-fast cooling, 6 groups of collecting pipes are opened, the water ratio is 1.57, the roller speed is 0.88m/s, and the acceleration is 0.007m/s2Applying a tail shielding function, wherein the shielding amount is 85 percent, the tail shielding length is 3m, manually closing the water feeding of the group 1, and the red returning temperature is 653 ℃;
8) straightening for 2 times by using a hot straightening machine after cooling, wherein the straightening force is 13070KN, and the integral plate type of the steel plate is ensured;
9) the steel plate is put in storage after being subjected to edge cutting, sampling, sizing, surface inspection and flaw detection qualification;
10) and (4) delivering the steel plate after the performance detection is qualified.
Example 3
The cooling method for improving the straightness of weathering steel A709Gr50 provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.081%, Mn: 1.142%, Si: 0.451%, Cr: 0.542%, Cu: 0.275%, Ni: 0.106% by weight, Ca was not added, and the balance was Fe and inevitable impurities.
The method for producing 60 x 3330mm weathering steel A709Gr50 by using 260 x 2770mm blanks comprises the following steps:
1) the slab enters a heating furnace to be heated, wherein the heating time is 0.89min/mm, the heating temperature is 1208 ℃, and the temperature uniformity of the slab is 7 ℃;
2) after the plate blank is taken out of the furnace, descaling for 1 time by a descaling box, and removing scale on the surface of the blank;
3) the rolling mill adopts multi-billet (four-billet) rolling, the rolling adopts even pass rolling, and the rolling mill has the function of flattening the last pass;
4) the initial rolling temperature is controlled at 1074 ℃, and 1/2/5 rough rolling passes are carried out to remove scale and remove secondary iron scale;
5) the intermediate blank is penetrated with water for 4 times so as to improve the production efficiency;
6) the initial rolling temperature of the second stage is 806 ℃, the thickness ratio of the intermediate billet is 1.77, 2 times of descaling and secondary scale removal are carried out before finish rolling, the rolling speed is 1.5-2.0 m/s, the last leveling speed is 1.0m/s, and the final rolling temperature is 823 ℃;
7) after the steel plate is taken out of the rolling mill, the steel plate is cooled by ultra-fast cooling, 7 groups of collecting pipes are opened, the water ratio is 1.7, the roller speed is 0.8m/s, and the acceleration is 0.005m/s2Applying a tail shielding function, wherein the shielding amount is 80 percent, the tail shielding length is 3m, manually closing the water feeding of the 1 st group, and returning to the red temperature of 662 ℃;
8) straightening for 2 times by using a hot straightening machine after cooling, wherein the straightening force is 15380KN, and the integral plate type of the steel plate is ensured;
9) the steel plate is put in storage after being subjected to edge cutting, sampling, sizing, surface inspection and flaw detection qualification;
10) and (4) delivering the steel plate after the performance detection is qualified.
The results of metallographic examination of examples 1 to 3 are as follows:
| Test item | Average grain size |
| 4752 | 8.0 |
| 4753 | 8.0 |
| 4754 | 9.5 |
| 4755 | 9.0 |
| 4756 | 9.5 |
the performance was tested as follows:
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 (7)
1. A cooling method for improving the flatness of weathering steel A709GR50 is characterized in that: the method comprises the following steps:
1) heating the plate blank in a heating furnace for 0.75-1.5 min/mm at 1190-1230 ℃ and the temperature uniformity of the plate blank is less than or equal to 15 ℃;
2) removing scale for 1 time by a scale removing box after the plate blank is taken out of the furnace;
3) the rolling mill adopts single-billet, double-billet or multi-billet rolling, the rolling adopts even pass rolling, and the last pass leveling function is used;
4) controlling the initial rolling temperature to be above 1050 ℃, and descaling the rough rolling mill for 2-3 times;
5) the initial rolling temperature of the second stage is less than or equal to 830 ℃, the thickness ratio of the intermediate billet is more than or equal to 1.7, the finish rolling mill descales for 2-3 times, the rolling speed is 1.5-3.0 m/s, the last pass flattening speed is 1.0m/s, and the final rolling temperature is 810-850 ℃;
6) after the steel plate is discharged from the rolling mill, the steel plate is cooled by ultra-fast cooling, 6-10 groups of collecting pipes are opened, the water ratio is 1.4-1.9, the roller speed is 0.5-1.2 m/s, and the acceleration is 0.003-0.008 m/s2Applying a tail shielding function, wherein the shielding amount is 70-90%, the tail shielding length is 2-5 m, manually closing the water feeding of the group 1, and the temperature of red return is 640-680 ℃;
7) straightening for 1-3 times by using a hot straightening machine after cooling, wherein the straightening force is 10000-20000 KN;
8) the steel plate is put in storage after being subjected to edge cutting, sampling, sizing, surface inspection and flaw detection qualification;
9) and (4) delivering the steel plate after the performance detection is qualified.
2. The cooling method for improving the flatness of the weathering steel a709GR50 according to claim 1, wherein: and (4) properly penetrating water for 2-6 times through the intermediate blank after the step 4).
3. The cooling method for improving the flatness of the weathering steel a709GR50 according to claim 1, wherein: the chemical components and mass percentage are as follows: 0.04-0.12%, Mn: 1.0% -1.5%, Si: 0.30-0.60%, Cr: 0.35-0.60%, Cu: 0.20-0.45%, Ni: 0.05 to 0.15 percent, no Ca, and the balance of Fe and inevitable impurities.
4. The cooling method for improving the flatness of the weathering steel A709GR50 as claimed in claim 3, wherein: the chemical components and mass percentage are as follows: 0.05 to 0.11 percent, Mn: 1.05-1.40%, Si: 0.35-0.55%, Cr: 0.40-0.55%, Cu: 0.25% -0.40%, Ni: 0.06 to 0.14 percent, no Ca, and the balance of Fe and inevitable impurities.
5. The cooling method for improving the flatness of the weathering steel A709GR50 as claimed in claim 3, wherein: the chemical components and mass percentage are as follows: 0.06% -0.10%, Mn: 1.1% -1.35%, Si: 0.35-0.50%, Cr: 0.45-0.55%, Cu: 0.25% -0.35%, Ni: 0.07 to 0.13 percent, no Ca is added, and the balance is Fe and inevitable impurities.
6. The cooling method for improving the flatness of the weathering steel A709GR50 as claimed in claim 3, wherein: the chemical components and mass percentage are as follows: 0.07-0.09%, Mn: 1.1% -1.25%, Si: 0.40-0.50%, Cr: 0.48-0.55%, Cu: 0.26-0.35%, Ni: 0.08 to 0.13 percent, no Ca is added, and the balance is Fe and inevitable impurities.
7. The cooling method for improving the flatness of the weathering steel a709GR50 according to claim 1, wherein: the product specification is as follows: the thickness is 50-100 mm, and the width is 2000-4500 mm.
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| WO2020098288A1 (en) * | 2018-11-12 | 2020-05-22 | 南京钢铁股份有限公司 | Q690d thick plate produced by ultra fast cooling process and manufacturing method |
| CN112108527A (en) * | 2020-08-28 | 2020-12-22 | 武汉钢铁有限公司 | Method for controlling plate shape of steel for hot-rolled high-strength stirring tank body |
| JP2021137841A (en) * | 2020-03-05 | 2021-09-16 | 日本製鉄株式会社 | Cooling device and cooling method for hot rolled steel sheet |
-
2021
- 2021-11-22 CN CN202111385417.0A patent/CN114160580A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104593695A (en) * | 2015-01-21 | 2015-05-06 | 首钢总公司 | Hot-rolled heavy gauge weathering resistant steel high in strength and low in nickel to copper ratio and production method of steel |
| CN106011647A (en) * | 2016-07-21 | 2016-10-12 | 唐山钢铁集团有限责任公司 | 460MPa-level extra-thick plate and production method thereof |
| CN107841689A (en) * | 2017-10-19 | 2018-03-27 | 南京钢铁股份有限公司 | A kind of weather-resistant steel plate and its manufacture method |
| CN108971225A (en) * | 2018-09-27 | 2018-12-11 | 武汉钢铁有限公司 | A kind of weather-proof checkered steel plate and its production method |
| WO2020098288A1 (en) * | 2018-11-12 | 2020-05-22 | 南京钢铁股份有限公司 | Q690d thick plate produced by ultra fast cooling process and manufacturing method |
| JP2021137841A (en) * | 2020-03-05 | 2021-09-16 | 日本製鉄株式会社 | Cooling device and cooling method for hot rolled steel sheet |
| CN112108527A (en) * | 2020-08-28 | 2020-12-22 | 武汉钢铁有限公司 | Method for controlling plate shape of steel for hot-rolled high-strength stirring tank body |
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