CN114231843A - Manufacturing method of plate-band weathering steel product for container gooseneck tunnel - Google Patents
Manufacturing method of plate-band weathering steel product for container gooseneck tunnel Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 244000261422 Lysimachia clethroides Species 0.000 title claims abstract description 25
- 229910000870 Weathering steel Inorganic materials 0.000 title claims description 19
- 238000001816 cooling Methods 0.000 claims abstract description 60
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- 238000005096 rolling process Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims abstract description 5
- 238000009749 continuous casting Methods 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 11
- 239000000956 alloy Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 238000005452 bending Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 description 18
- 239000011651 chromium Substances 0.000 description 16
- 239000010949 copper Substances 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 239000011572 manganese Substances 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 229910006540 α-FeOOH Inorganic materials 0.000 description 2
- 241000931705 Cicada Species 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a manufacturing method of a plate and strip weather-resistant steel product for a container gooseneck tunnel, belonging to the field of steel production, wherein the working procedures comprise a converter → an LF furnace for refining → continuous casting → a casting blank hot-fed steel rolling heating furnace → rolling → cooling → coiling, and the cooling is divided into two cooling modes of an ultra-fast cooling section and a laminar cooling section; the ultra-fast cooling speed is 50-60 ℃/s, and the laminar flow cooling outlet temperature is set at 550 ℃ and 580 ℃. Compared with the prior art, the bending die has the characteristics of uniform yield strength and bending resilience angle less than or equal to 2 degrees.
Description
Technical Field
The invention relates to a steel production method, in particular to a method for manufacturing a plate and band weathering steel product for a container gooseneck tunnel based on an ultra-fast cooling process.
Background
The container and the transportation thereof enable products in all corners of the world to easily log in all parts of the world, are important carrying tools of global trade flow, and play an indispensable role in international trade and world economy. China has been in the cicada union world for many years and the first container production and sales are achieved, and a complete container manufacturing industrial chain with high standardization degree is formed.
In the manufacturing of the container, the gooseneck tunnel is the most special part, and in order to ensure that the plate belt product for the gooseneck tunnel meets the technical requirements of the manufacturing of the container, the adopted SPA-H plate belt product has high performance requirements, needs to have thick thickness and large width, is complex to machine and form, and has stable dimensional precision after machining and no resilience. When the plate strip for the gooseneck tunnel is produced, the product structure performance is improved by adding a large amount of alloy Cu, Cr and Ni, so that the manufacturing cost of the plate strip product is greatly increased. For example, patent "a P segregation-free weathering steel hot-rolled thin strip and manufacturing method thereof" (CN201410591781.6) discloses weathering steel, which comprises the following components: 0.07-0.12%; si: 0.30-0.50%; mn: 0.4-0.55%; p: 0.06-0.15%; s: less than or equal to 0.02 percent and more than 0 percent; cr: 0.6-0.8%; ni: 0.03-0.11%; cu: 0.2-0.5%; al: less than or equal to 0.046 percent and more than 0 percent; b: less than or equal to 0.003 percent and more than 0 percent; the yield strength is more than or equal to 390MPa, the tensile strength is more than or equal to 490MPa, the elongation after fracture is more than or equal to 21 percent, but the alloy elements are added with more Cr: 0.6-0.8 percent, and B element is required to be added, so the alloy cost is higher. And Cr is seriously harmful to the health of people in a + 6-valent state, has huge toxicity, and other alloy elements have to be added in order to reduce the Cr content, so that the production cost is increased.
In addition, the conventional SPA-H plate strip has the technical defect that the resilience angle is larger than 5 degrees after 90-degree bending processing of the edge part due to uneven strength in the gooseneck groove processing process, and the requirement on the size of subsequent assembly, welding and assembly is not met.
Disclosure of Invention
The technical task of the invention is to provide a manufacturing method of a weather-resistant steel product with a plate strip for a gooseneck tunnel of a container, aiming at the defects of the prior art, the invention ensures that the performance of the weather-resistant steel specification strip steel for the gooseneck tunnel in the width direction is more uniform and the yield ratio is lower through a novel laminar cooling process and component system design, so as to solve the problems that the assembly precision cannot meet the assembly size requirement and the efficiency is reduced due to bending resilience in the processing and using process of a client.
The technical scheme for solving the technical problem is as follows: a manufacturing method of weather-resistant steel products of plate strips for a container gooseneck tunnel comprises the procedures of converter → LF furnace refining → continuous casting → casting blank hot delivery steel rolling heating furnace → rolling → cooling → coiling, and is characterized in that: the cooling is divided into an ultra-fast cooling section and a laminar cooling section; the ultra-fast cooling speed is 50-60 ℃/s, and the laminar flow cooling outlet temperature is set at 550 ℃ and 580 ℃.
The weathering resistant steel product comprises the following chemical components in percentage by mass: c: 0.08-0.11%, Si: 0.20-0.35%, Mn: 0.45-0.55%, P: 0.075-0.090%, S is less than or equal to 0.010%, Cu: 0.26-0.32%, Cr: 0.35-0.42%, Ni: 0.09-0.13 percent of the total weight of the alloy, and the balance of Fe and inevitable impurities.
The ultra-fast cooling section is provided with four groups of cooling headers, and each group of headers is opened 6 and closed 4 groups of water.
The ultra-fast cold pressure setting value of the ultra-fast cold section is 0.5MPa, and the water-to-water ratio is 0.7.
The outlet temperature of the ultrafast cooling section is 630-650 ℃.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the invention adopts the design of low-copper and low-chromium alloy components, and reduces the production cost on the premise of ensuring the performance;
2. the special ultra-fast cooling process is adopted, the heating, rolling and layer cooling processes are optimized, so that the weathering steel product with uniform yield strength (the yield strength is more than or equal to 355MPa, the tensile strength is more than or equal to 490MPa, and the elongation is more than or equal to 22%) is obtained, the produced performance is qualified, the surface quality meets the container manufacturing, the JIS3125 standard requirement and the requirement of bending resilience in later processing of customers are met, and the bending resilience angle is less than or equal to 2 degrees;
3. the method realizes the stable batch production of the weathering steel for the gooseneck tunnel of the container with the size range of 4.0-4.5X1390-1400mm on the conventional hot continuous rolling production line, the single rolling process can continuously produce more than 1200 tons, and the yield reaches more than 97.5 percent;
4. the limit negative difference production of the weathering steel for the container gooseneck tunnel is realized, the container forming rate reaches over 107.5 percent, and steel is saved by 3 percent under the condition of meeting the requirements of the processing and the use performance of the container gooseneck tunnel.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The invention provides a rolling method of plate and strip products for a container gooseneck tunnel based on an ultra-fast cooling process through new components and a cooling process design, and the rolling method has stable surface quality and plate shape quality, meets the standard in performance, has small processing resilience and can be stably produced in batches.
The invention discloses a plate and strip weathering steel component system for a container gooseneck tunnel, which comprises the following chemical components in percentage by mass: c: 0.08-0.11%, Si: 0.20-0.35%, Mn: 0.45-0.55%, P: 0.075-0.090%, S is less than or equal to 0.010%, Cu: 0.26-0.32%, Cr: 0.35-0.42%, Ni: 0.09-0.13 percent of the total weight of the alloy, and the balance of Fe and inevitable impurities.
C: the steel can improve the strength, is a main interstitial solid solution strengthening element, and can greatly improve the strength of steel. However, if the content of C is too high, the weldability, cold formability and impact toughness of the steel are significantly deteriorated, and at the same time, problems such as too large springback are caused, pearlite transformation is promoted, and atmospheric corrosion resistance of the steel is reduced. The invention adopts a low-C design, and the C content is 0.08-0.11%; the optimized scheme is 0.08-0.09%.
Si: the strength of the steel can be improved through solid solution strengthening, the segregation of manganese and phosphorus can be inhibited by a proper amount of silicon, the atmospheric corrosion resistance of the steel can also be improved, the smelting cost is increased when the content is lower than 0.20%, and the surface of a hot-rolled steel plate is easy to be rough when the content is higher than 0.30%, so that the content of Si in the invention is 0.20-0.35%; the optimized scheme is 0.31-0.33%.
Mn: the strength can be improved through solid solution strengthening, the phase transition temperature of steel can be reduced, crystal grains can be refined, the low-temperature toughness of the steel can be improved, but the hardenability is increased due to too much Mn content, so that the weldability and the toughness of a welding heat affected zone are deteriorated, and the cost is increased at the same time, in the invention, through alloy collocation, a relatively low manganese design is adopted, and the Mn content is 0.45-0.55%; the optimized scheme is 0.49-0.52%.
P: the high-phosphorus-content high-ductility weather-resistant steel is a main alloy element in the traditional weather-resistant steel, the phosphorus content is too low, the weather resistance is difficult to guarantee, but when the phosphorus content is too high, high-temperature cracks are easy to generate, the low-temperature crack sensitivity is increased, the ductility and the toughness of a welding line are deteriorated, and the P content is 0.075-0.09%; the optimized scheme is 0.079-0.085%.
S: the sulfide inclusions generated not only seriously affect the mechanical property of the steel, but also have serious deterioration effect on the corrosion resistance of the steel, so the S content of the steel is reduced as much as possible to be less than 0.010 percent; the optimized scheme is 0.004-0.005%.
Cu: the Cu content of the steel is 0.26-0.32 percent, and the Cu content is high enough to improve the atmospheric corrosion resistance of the steel and the strength of the steel; the optimized scheme is 0.26-0.27%.
Cr has an obvious effect of improving the passivation capability of steel, can promote the surface to form a compact passivation film or a protective rust layer, but the excessively high Cr content is not favorable for welding and toughness, and the Cr content is 0.35-0.42 percent in the invention; the optimized scheme is 0.37-0.39%.
Ni is an important alloy element for improving the marine atmospheric corrosion resistance of the weathering steel. In addition, Ni can refine the crystal grains of the steel, improve the low-temperature toughness of the steel and effectively prevent the network fracture caused by Cu hot brittleness, and the Ni content in the steel is designed to be 0.09-0.13%; the optimized scheme is 0.10-0.11%.
In the prior art, Cr is used for improving the atmospheric corrosion resistance of steelThe most important element of the performance, the Cr content is increased to be beneficial to refining the alpha-FeOOH, when the Cr content in the alpha-FeOOH of the rust layer/metal interface exceeds 5 percent, corrosive anions, particularly Cl, can be effectively inhibited-The invasion of ions, which is particularly important in marine environments, is generally in the range: 0.6 to 0.8 percent. Meanwhile, Cr is easy to generate toxicity in a +6 valence state, and seriously harms the health of people. Therefore, Nb and Ti are added in the production to overcome the defects of strength and corrosion resistance caused by low Cr content in the formula, but the addition of alloy elements causes the production cost to be increased. Therefore, the trade-off between the Cr content and the Cr content is a difficult point in the art. According to the technology, only one kind of Ni is added and the production process is matched for rolling and cooling control, so that the balance of the strength and the corrosion resistance of the low-Cr-content steel plate with the C content of 0.08-0.11% is realized, the cooling uniformity in the width direction is ensured, and the weathering steel product with uniform yield strength is obtained.
The production process comprises the procedures of converter → LF furnace refining → continuous casting → hot-feeding and rolling heating furnace of casting blank → rolling → ultrafast cooling → laminar cooling → coiling.
S1 refining in converter and LF furnace
S2, continuous casting
S3, heating the casting blank
The slab length is 8500-10800mm, the width is 1400-1420mm, the thickness is 210mm, the hot slab time is more than or equal to 120min, the cold slab time is more than or equal to 150min, the temperature of the soaking section is ensured to be 1220-1280 ℃, the temperature of the slab is ensured to be uniform, and the temperature difference between the same slab and the slab is less than or equal to 15 ℃.
S4 rough rolling
The rough rolling is carried out for 6 passes (3+3 mode), the rough rolling finishing temperature is controlled at 1060-1100 ℃, the thickness of the intermediate blank is 34-38mm, the rough rolling reduction is 172-176mm, and a heat preservation cover is put at the rough rolling outlet, so that the overall temperature of the intermediate blank is ensured, and the temperature drop of the edge part is reduced.
S5 finish rolling
Cooling water in the finishing mill frame is boiled for 2 groups, and the water cutting clearance on the working roll is less than or equal to 1mm, so that the temperature of the plate blank is ensured to be uniform and stable in the rolling process.
The initial rolling temperature of finish rolling is integrally controlled to be 980-1050 ℃, the finish rolling is carried out for 7 times, and the final rolling temperature is 830-860 ℃.
The reduction rates of finish rolling F1-F7 are respectively 34-38%, 36-42%, 31-35%, 24-28%, 18-21%, 10-13% and 7.5-10%, the reduction rate of the first two passes is guaranteed to be more than 30%, and the grain refinement of the steel plate after rolling is guaranteed.
S6, laminar cooling
Designing an ultra-fast cooling process: the cooling section is divided into an ultra-fast cooling section and a laminar cooling section, the ultra-fast cooling section is provided with four groups of cooling headers, a special cooling mode is adopted for the weathering steel for the gooseneck tunnel, 4 groups of water are opened and closed for each group of headers, the setting value of the ultra-fast cooling pressure is 0.5MPa medium pressure mode, the water-to-water ratio is 0.7, the ultra-fast cooling speed is 50-60 ℃/s, and within 4s, the precision rolling outlet temperature is 830-850 ℃ and the rapid cooling speed is increased to the ultra-fast cooling outlet temperature is 630-650 ℃ so as to obtain refined ferrite and pearlite structures, and the laminar cooling outlet temperature is set to 550-580 ℃. Compared with the conventional laminar cooling process, the defects of uneven cooling in the width direction and impermeable cooling in the thickness direction are overcome by the detailed arrangement of the ultra-fast cooling process.
The process ensures the cooling uniformity in the width direction to obtain the weathering steel product with uniform yield strength, the fluctuation range of the yield strength of the same coil is reduced to be within 10MPa, and the bending resilience angle is less than or equal to 2 degrees.
S7, winding
The coiling temperature is 550 ℃ and 580 ℃.
The invention obtains the plate and strip product for the gooseneck tunnel of the container, which has stable performance, small resilience, stable batch production, good plate shape and good surface quality, through the process control of new component design, ultra-fast cooling process, development and application of a model, heating, rough rolling, finish rolling, coiling process and the like.
To better compare the formulations of the present application with the prior art, comparative tests were performed.
The chemical components and the technical characteristics of the process are adopted in the embodiments 1 to 4; the chemical composition of comparative example 1 was the same as example 2 and the process was carried out using conventional techniques. The production specification ranges from 4.0 to 4.5mm in thickness and 1390 and 1400mm in width.
The chemical compositions (in weight percent) of examples 1-4 and comparative examples are shown in the following table, with the balance being iron and unavoidable impurities.
| Item | C | Si | Mn | P | S | Cu | Cr | Ni |
| Example 1 | 0.092 | 0.324 | 0.51 | 0.082 | 0.005 | 0.26 | 0.39 | 0.11 |
| Example 2 | 0.089 | 0.313 | 0.49 | 0.079 | 0.004 | 0.27 | 0.38 | 0.10 |
| Example 3 | 0.093 | 0.332 | 0.52 | 0.083 | 0.004 | 0.27 | 0.39 | 0.11 |
| Example 4 | 0.094 | 0.331 | 0.50 | 0.085 | 0.005 | 0.26 | 0.37 | 0.10 |
| Comparative example | 0.089 | 0.313 | 0.49 | 0.079 | 0.004 | 0.27 | 0.38 | 0.10 |
The process flow routes of examples 1-4 and comparative examples are: slab heating → rough rolling → finish rolling → laminar cooling (cooling strategy is front stage) → coiling. The main process control parameters are shown in the following table.
The properties of the steel products of the examples and the comparative examples are shown in the following table.
From the data in the table, the steel products produced in the examples 1 to 3 have the strength fluctuation range reduced from 22MPa to within 10MPa in the width direction of the strip steel; the resilience angle after 90-degree machining is controlled within 2 degrees, the requirements of JIS3125 standards and bending resilience in later-stage machining of customers are met, the bending resilience angle is less than or equal to 2 degrees, the requirements of users are met, the bending machine does not need to increase the 2s holding time, and the operating efficiency and the subsequent assembly precision are improved. The obtained rolled steel has stable surface quality and plate shape, can continuously produce more than 1200 tons in a single rolling process, has the yield of more than 97.5 percent, realizes the ultimate negative difference production of the weathering steel for the container gooseneck tunnel, has the container yield of more than 107.5 percent, and saves 3 percent of steel under the condition of meeting the requirements of the processing and the use performance of the container gooseneck tunnel. Even though the comparative example is realistic in composition and the embodiment, the controlled rolling and controlled cooling modes are different and are front section cooling, the cooling speed is low, and the cooling modes are different, so that the problem that the strength fluctuation range in the width direction cannot be overcome under the condition of large width is solved, batch bending resilience phenomenon occurs in the processing process of customers due to high material yield strength, the resilience angle reaches 5-9 degrees, the subsequent assembly size precision does not reach the standard, and the container assembly production rhythm is influenced.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (5)
1. A manufacturing method of weather-resistant steel products of plate strips for a container gooseneck tunnel comprises the procedures of converter → LF furnace refining → continuous casting → casting blank hot delivery steel rolling heating furnace → rolling → cooling → coiling, and is characterized in that: the cooling is divided into an ultra-fast cooling section and a laminar cooling section; the ultra-fast cooling speed is 50-60 ℃/s, and the laminar flow cooling outlet temperature is set at 550 ℃ and 580 ℃.
2. The method for manufacturing a plate and strip weathering steel product for a container gooseneck tunnel according to claim 1, characterized in that: the weathering steel product comprises the following chemical components in percentage by mass: c: 0.08-0.11%, Si: 0.20-0.35%, Mn: 0.45-0.55%, P: 0.075-0.090%, S is less than or equal to 0.010%, Cu: 0.26-0.32%, Cr: 0.35-0.42%, Ni: 0.09-0.13 percent of the total weight of the alloy, and the balance of Fe and inevitable impurities.
3. The method for manufacturing a plate and strip weathering steel product for a container gooseneck tunnel according to claim 1, characterized in that: the ultra-fast cooling section is provided with four groups of cooling headers, and each group of headers is opened and closed with 6 groups of water and 4 groups of water.
4. The method for manufacturing a plate and strip weathering steel product for a container gooseneck tunnel according to claim 1, characterized in that: the ultra-fast cold section ultra-fast cold pressure setting value is 0.5MPa in a medium pressure mode, and the water-to-water ratio is 0.7.
5. The method for manufacturing a plate and strip weathering steel product for a container gooseneck tunnel according to claim 1, characterized in that: the outlet temperature of the ultra-fast cooling section is 630-650 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111465034.4A CN114231843A (en) | 2021-12-03 | 2021-12-03 | Manufacturing method of plate-band weathering steel product for container gooseneck tunnel |
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| CN202111465034.4A CN114231843A (en) | 2021-12-03 | 2021-12-03 | Manufacturing method of plate-band weathering steel product for container gooseneck tunnel |
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| CN202111465034.4A Pending CN114231843A (en) | 2021-12-03 | 2021-12-03 | Manufacturing method of plate-band weathering steel product for container gooseneck tunnel |
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Citations (6)
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| CN101824525A (en) * | 2010-05-07 | 2010-09-08 | 攀钢集团钢铁钒钛股份有限公司 | Production method of hot milling steel plate |
| CN102691004A (en) * | 2012-06-20 | 2012-09-26 | 武汉钢铁(集团)公司 | Production method for treating weathering steel for containers without sand blasting or shot blasting |
| JP2014118629A (en) * | 2012-12-19 | 2014-06-30 | Nippon Steel & Sumitomo Metal | Steel sheet pile and its manufacturing method |
| 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 |
| CN107419191A (en) * | 2017-08-16 | 2017-12-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Ultra-thin weathering steel and its production method |
| CN111926261A (en) * | 2020-08-31 | 2020-11-13 | 日照钢铁控股集团有限公司 | High-strength weathering steel with yield strength of 550MPa and production method thereof |
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2021
- 2021-12-03 CN CN202111465034.4A patent/CN114231843A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101824525A (en) * | 2010-05-07 | 2010-09-08 | 攀钢集团钢铁钒钛股份有限公司 | Production method of hot milling steel plate |
| CN102691004A (en) * | 2012-06-20 | 2012-09-26 | 武汉钢铁(集团)公司 | Production method for treating weathering steel for containers without sand blasting or shot blasting |
| JP2014118629A (en) * | 2012-12-19 | 2014-06-30 | Nippon Steel & Sumitomo Metal | Steel sheet pile and its manufacturing method |
| 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 |
| CN107419191A (en) * | 2017-08-16 | 2017-12-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Ultra-thin weathering steel and its production method |
| CN111926261A (en) * | 2020-08-31 | 2020-11-13 | 日照钢铁控股集团有限公司 | High-strength weathering steel with yield strength of 550MPa and production method thereof |
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