CN115505824A - Manufacturing method of steel belt for SPA-H weather-resistant container with high surface quality - Google Patents
Manufacturing method of steel belt for SPA-H weather-resistant container with high surface quality Download PDFInfo
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- CN115505824A CN115505824A CN202211295007.1A CN202211295007A CN115505824A CN 115505824 A CN115505824 A CN 115505824A CN 202211295007 A CN202211295007 A CN 202211295007A CN 115505824 A CN115505824 A CN 115505824A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B1/30—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 plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—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 plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- 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
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to the field of metallurgy, and relates to a manufacturing method of a steel strip for a high-surface-quality SPA-H weather-resistant container, which comprises the steps of enabling desulfurized molten iron to enter a converter process to deeply desulfurize molten iron and smelt a pure steel edge, enabling the smelted molten iron to enter a CAS process to measure temperature and sample, enabling the smelted molten iron to enter an LF process to heat, desulfurize, remove impurities and finely adjust components after the smelted molten iron leaves the converter, enabling the molten iron to enter a rolling process through a continuous casting process and a heating process, and reeling and packing after the rolling process is finished through a layer cooling process, wherein the rolling process comprises the steps of high-pressure descaling, rough rolling with a vertical roller, finish rolling, high-pressure descaling and finish rolling 7 rack continuous rolling; the invention mainly designs and controls the steel-making, heating and rolling processes independently through reasonable chemical components; the surface quality is excellent, and the machining capacity is good; all the mechanical properties meet the technical requirements, the internal control requirements and the use requirements of users are met, the surface has no scale defects and pit defects, and the product has excellent plastic toughness and good comprehensive mechanical processing performance.
Description
Technical Field
The invention belongs to the field of metallurgy, and relates to a manufacturing method of a steel belt for a high-surface-quality SPA-H weather-resistant container.
Background
With the concern of manufacturing cost, mineral resources, energy, and the like, the container has a tendency to be long-lived and light-weighted, and the container is expected to be made of an aluminum material having a very light weight. The yield strength of the steel plate for the container is about 300MPa, the weathering steel SPA-H is designed by adding reasonable components of Cu, P, cr and Ni in low-carbon steel in a composite manner, the yield strength is 390-439, and the steel plate has strong corrosion resistance and can be completely used for manufacturing the container. In the container manufacturing industry, the internal structure and the outer plate are generally manufactured by hot rolling thin steel plates with the compression resistance of more than 345MPa and the atmospheric corrosion resistance. The steel plate used for manufacturing the container is more than 300 million tons every year, and along with the development of the container transportation industry, the demand of atmospheric corrosion resistant steel is gradually increased, so that the production and use cost is lower, and the cost performance is high. The container steel has good prospect in ocean transportation due to excellent forming and processing performance of the product.
In the manufacturing process of the existing weather-resistant hot-rolled wide steel strip, the weather-resistant elements and high silicon content of the series of products are not considered, the surface quality of the hot-rolled product is difficult to ensure, meanwhile, the performance influence factors are more, the yield ratio and the formability of the product are difficult to improve by only designing the components, the requirements on production conditions are met, and the general applicability is not realized; in addition, the alloy element nickel with more activity is added, so that the alloy cost is increased, and the total manufacturing cost is influenced.
Disclosure of Invention
In view of the above, the invention aims to provide a method for manufacturing a high-surface-quality SPA-H weather-resistant container steel strip, which adopts the design concept of low-carbon and low-manganese components, and has the advantages of high surface quality, high extensibility and good formability.
In order to achieve the purpose, the invention provides the following technical scheme: a manufacturing method of a steel belt for a high-surface-quality SPA-H weather-resistant container comprises the steps of enabling desulfurized molten iron to enter a converter process to be smelted with pure steel, enabling the smelted molten iron to enter a CAS process to carry out station entering temperature measurement and sampling, enabling the smelted molten steel to enter an LF process to carry out temperature rise, desulphurization, impurity removal and fine adjustment after the smelted molten steel is out of a station, enabling the smelted molten steel to enter a rolling process through a continuous casting process and a heating process, carrying out coiling and packaging after the rolling process is finished through a layer cooling process, and enabling the rolling process to comprise the steps of high-pressure descaling, rough rolling with a vertical roller, finish rolling high-pressure descaling and finish rolling 7 rack continuous rolling; the steel comprises the following chemical components in percentage by weight: 0.05 to 0.10 percent of C, 0.25 to 0.50 percent of Si, 0.40 to 0.60 percent of Mn, 0.07 to 0.15 percent of P, less than 0.015 percent of S, 0.25 to 0.40 percent of Cu, 0.30 to 1.2 percent of Cr, 0.02 to 0.09 percent of Ni, and the balance of Fe and inevitable impurities.
Optionally, in the step of desulfurizing molten iron, the molten iron enters the converter molten iron [ S ] by the depth of molten iron is less than or equal to 0.005%.
Optionally, in the converter smelting process, deep desulfurization molten iron and pure steel are adopted for smelting, and iron-containing resources with high content of residual elements such as slag steel, pig iron blocks and the like are not used; the smelting process pays attention to the change of the furnace condition, so that splashing can not occur, and the stable carbon and oxygen contents and steel tapping quantity at the end point of the converter are ensured.
Optionally, the tapping temperature in the converter working procedure is controlled to be 1650-1665 ℃, the content of tapping [ C ] is less than or equal to 0.05 percent, and the content of tapping [ O ] is 500-850 PPm; tapping and slag stopping are carried out, and the P content of the discharged slag is less than or equal to 0.003 percent; tapping 350-450 kg of thick slag agent and 600-800 kg of refined lime; the tapping process is argon blowing at a small flow rate, and the tapping and CAS cannot be stirred at a large flow rate.
Optionally, molten steel enters a station in the CAS procedure for temperature measurement and sampling, and aluminum particles are added on the slag surface of a steel ladle discharged from the CAS procedure at 60-100 kg/furnace.
Optionally, in the LF procedure, the molten steel enters a station, is heated, and is added with 500-2000 kg of lime per furnace, and bauxite is added according to the situation; the method of manually adding aluminum particles into the steel ladle is adopted, and a storage bin is not adopted for adding aluminum pills; the whole-process ladle argon blowing flow of LF is 5-15 Nm 3 H; before LF, the silicon, manganese, phosphorus and aluminum elements of the molten steel meet the target requirements.
Optionally, the continuous casting pouring period in the continuous casting process is controlled according to 38 min; the target temperature of the tundish molten steel is 1545-1560 ℃; the pouring process protects good pouring; under normal conditions, the argon blowing flow of the stopper rod is controlled to be less than or equal to 3L/min; the casting drawing speed is 1.1m/s.
Optionally, the charging temperature in the heating process is less than or equal to 600 ℃, a high-temperature fast firing process is adopted, the temperature of the preheating section is 1100 ℃, the temperature of the heating section is 1150-1270 ℃, the retention time is 40-50min, the temperature of the soaking section is 1230 ℃, the temperature of the slab discharging is 1230-1270 ℃, and the temperature difference between the surface and the center of the slab discharging is 40 ℃.
Optionally, in the rolling process,
1) In the aspect of scale removal: one group of high-pressure descaling boxes is used, the high-pressure descaling boxes are not sprayed with the descaling of the roughing mill at the same time, the water pressure is kept between 21 and 23MPa, the descaling frequency on the roughing mill is two groups of the finish rolling descaling boxes for 5 times, and the water pressure is 19 to 21MPa;
2) The rough rolling process comprises the following steps: the roughing mill adopts 5 times of reversible reduction, and the thickness of the intermediate blank is 33-35mm; the width of the vertical roll is reduced by 20mm by throwing the vertical roll for 1/3/5 pass of the vertical roll;
3) Finish rolling process: the descaling water is used between the frames F1 and F2, the three frames F1, F3 and F5 are used for spraying reverse water, and the secondary scale is controlled; the rolling speed and the rolling load are set with reference to a model system.
Optionally, in the layer cooling process, according to the iron scale composition principle, the coiling temperature is adjusted, the target temperature is reduced by 20 ℃, meanwhile, a precision rolling outlet intensive cooling device is put into use, front section cooling is concentrated, and the water cooling speed is 15-22 ℃/s.
The invention has the beneficial effects that: the invention relates to a manufacturing method of a steel belt for a high-surface-quality SPA-H weather-resistant container, which is characterized in that steel making, heating and rolling processes are independently designed and controlled through reasonable chemical components; the product is developed successfully under the existing conditions, has excellent surface quality and good machining capacity; all the mechanical properties meet the technical requirements, the internal control requirements and the use requirements of users are met, the surface has no scale defects and pit defects, and the product has excellent plastic toughness and good comprehensive mechanical processing performance.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the following embodiments are merely illustrative of the basic idea of the present invention, and features in the following embodiments and examples may be combined with each other without conflict.
The invention discloses a manufacturing method of a steel belt for a high-surface-quality SPA-H weather-resistant container, which adopts a low-carbon and low-manganese component design idea, and comprises the steps of enabling desulfurized molten iron to enter a converter process for smelting deep desulfurized molten iron and pure steel, enabling the smelted molten steel to enter a CAS process for station temperature measurement and sampling, enabling the smelted molten steel to enter an LF process for temperature rise, desulfurization, impurity removal and fine adjustment after leaving the converter process, enabling the smelted molten steel to enter a rolling process through a CAS process for heating, enabling the smelted molten steel to enter the rolling process through a continuous casting process and a heating process, and enabling the molten steel to be coiled and packed after the rolling process is finished through a layer cooling process, wherein the rolling process comprises the steps of high-pressure descaling, rough rolling with a vertical roller, finish rolling high-pressure descaling and finish rolling 7 rack continuous rolling; the steel comprises the following chemical components in percentage by weight: 0.05 to 0.10 percent of C, 0.25 to 0.50 percent of Si, 0.40 to 0.60 percent of Mn, 0.07 to 0.15 percent of P, less than 0.015 percent of S, 0.25 to 0.40 percent of Cu, 0.30 to 1.2 percent of Cr, 0.02 to 0.09 percent of Ni, and the balance of Fe and inevitable impurities, thereby ensuring that each item of a product mechanical test reaches the standard, the surface quality of the strip steel is good, no oxide skin and surface pockmark defects exist, and the use requirements of users are met.
Desulfurizing molten iron: the molten iron is deeply desulfurized and is less than or equal to 0.005 percent when entering the molten iron (S) of the converter.
A converter process: the converter smelting adopts deep desulfurization molten iron and pure steel for smelting without using iron-containing resources with more residual element content, such as slag steel, pig iron blocks and the like. The smelting process focuses on the change of furnace conditions, splashing cannot occur, and the stable carbon and oxygen contents and steel tapping amount at the end point of the converter are ensured. The tapping temperature is controlled to be 1650-1665 ℃, and the steel is tapped at the temperature of [ C ]]The content is less than or equal to 0.05 percent, tapping is carried out]The content is 500-850 PPm. Tapping and slag stopping are carried out, and the P content of the discharged slag is less than or equal to 0.003 percent; 350-450 kg of tapping slag thickening agent and 600-800 kg of refined lime. The tapping process is that argon (5-15 Nm) is blown at a small flow 3 And/h), the tapping and CAS can not be stirred by blowing argon at a large flow rate.
CAS procedure: molten steel enters a station for temperature measurement and sampling, and 60-100 kg of aluminum particles are added on the slag surface of a steel ladle discharged from a CAS station.
And LF (ladle furnace) procedure: the LF process mainly aims at heating, desulfurizing, removing impurities and finely adjusting components. Molten steel enters a station, is heated up and is added into a furnace with 500-2000 kg of lime, and bauxite is added according to the situation. The mode of manually adding aluminum particles into the steel ladle is adopted, and a storage bin is not adopted for adding aluminum pills. The whole-process ladle argon blowing flow of LF is 5-15 Nm 3 And h, the large-flow argon blowing stirring is not required. Before LF, the silicon, manganese, phosphorus and aluminum elements of the molten steel meet the target requirements.
And (3) continuous casting process: the continuous casting period is controlled according to 38 min. The target temperature of the tundish molten steel is 1545-1560 ℃. The pouring process protects good pouring. Under normal conditions, the argon blowing flow of the stopper rod is controlled to be less than or equal to 3L/min. Casting pulling speed is 1.1m/s
And (3) heating process: the charging temperature is less than or equal to 600 ℃, a high-temperature fast firing process is adopted, the temperature of a preheating section is 1100 ℃, the temperature of a heating section is 1150-1270 ℃, the retention time is 40-50min, the temperature of a soaking section is 1230 ℃, the discharging temperature of a plate blank is 1230-1270 ℃, and the temperature difference between the surface and the center of the plate blank is 40 ℃ when the plate blank is discharged.
The rolling process comprises the following steps:
(1) in the aspect of descaling, the high-pressure descaling boxes are used in one group, are not sprayed with the roughing mill for descaling, have water pressure of 21-23 MPa, and are used in two groups for 5 times of finish rolling descaling boxes, and have water pressure of 19-21 MPa.
(2) The rough rolling process comprises the following steps: the roughing mill adopts 5 times of reversible reduction, and the thickness of the intermediate billet is 33-35mm; the vertical roll is put into use for 1/3/5 passes of the vertical roll to reduce the width by 20mm,
(3) finish rolling process: the descaling water is used between the frames F1 and F2, the three frames F1, F3 and F5 are used for spraying reverse water, and the secondary scale is controlled; the rolling speed and the rolling load are set with reference to a model system.
A layer cooling process: according to the iron scale forming principle, the coiling temperature is adjusted, the target temperature is reduced by 20 ℃, meanwhile, a finish rolling outlet intensive cooling device is used, the front section is intensively cooled, and the water cooling speed is 15-22 ℃/s.
The attached table is an example of 3 batches of steel strip smelting compositions.
The attached table two is an example of 3 batches of steel strip process control cases.
The third attached table is 3 batches of examples of the mechanical properties and the technological properties of the steel strip.
Attached watch 1
Attached watch 2
Attached table III
| Test steel coil | Thickness/mm | Re/MPa | Rm/MPa | Re/Rm | A/％ | 180 degree test | Surface quality condition |
| A | 4.0 | 405 | 512 | 0.791 | 38 | d =1.0a pass | Non-oxidized iron sheet |
| B | 3.2 | 388 | 486 | 0.799 | 37 | d =1.0a pass | Non-oxidized iron sheet |
| C | 2.0 | 407 | 507 | 0.803 | 33.5 | d =1.0a pass | Non-oxidized iron sheet |
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A manufacturing method of a steel belt for a high-surface-quality SPA-H weather-resistant container is characterized by comprising the following steps: the method comprises the steps that desulfurized molten iron enters a converter process to be deeply desulfurized molten iron and is smelted with pure steel, the smelted molten iron enters a station through a CAS process to be subjected to temperature measurement and sampling, the molten iron after being discharged enters an LF process to be subjected to temperature rise, desulfurization, impurity removal and fine adjustment of components, then enters a rolling process through a continuous casting process and a heating process, the rolling process is coiled and packaged after being subjected to a layer cooling process, and the rolling process comprises the steps of high-pressure descaling, rough rolling with vertical rolls, finish rolling and high-pressure descaling and continuous rolling of a finish rolling 7 rack;
the steel comprises the following chemical components in percentage by weight: 0.05 to 0.10 percent of C, 0.25 to 0.50 percent of Si, 0.40 to 0.60 percent of Mn, 0.07 to 0.15 percent of P, less than 0.015 percent of S, 0.25 to 0.40 percent of Cu, 0.30 to 1.2 percent of Cr, 0.02 to 0.09 percent of Ni, and the balance of Fe and inevitable impurities.
2. The method for manufacturing the steel strip for the SPA-H weather-resistant container with high surface quality as claimed in claim 1, wherein the steps of: in the step of desulfurizing molten iron, the molten iron enters the converter to make the S content less than or equal to 0.005%.
3. The method for manufacturing the steel strip for the SPA-H weather-resistant container with high surface quality as claimed in claim 1, wherein the steps of: in the converter process, the converter smelting adopts deep desulfurization molten iron and pure steel to smelt without using iron-containing resources with more residual elements such as slag steel, pig iron blocks and the like; the smelting process pays attention to the change of the furnace condition, so that splashing can not occur, and the stable carbon and oxygen contents and steel tapping quantity at the end point of the converter are ensured.
4. The method for manufacturing the steel strip for the SPA-H weather resistant container with high surface quality as claimed in claim 3, wherein: the tapping temperature in the converter working procedure is controlled to be 1650-1665 ℃, the content of tapping [ C ] is less than or equal to 0.05 percent, and the content of tapping [ O ] is 500-850 PPm; tapping and slag stopping are carried out, and the P content of the discharged slag is less than or equal to 0.003 percent; 350-450 kg of tapping thick slag agent and 600-800 kg of refined lime; the tapping process is argon blowing at a small flow rate, and the tapping and CAS cannot be stirred at a large flow rate.
5. The method for manufacturing the steel strip for the SPA-H weather resistant container with high surface quality as claimed in claim 1, wherein: in the CAS process, molten steel enters a station for temperature measurement and sampling, and 60-100 kg of aluminum particles are added on the slag surface of a steel ladle when the CAS is out of the station.
6. The method for manufacturing the steel strip for the SPA-H weather-resistant container with high surface quality as claimed in claim 1, wherein the steps of: in the LF procedure, molten steel enters a station and is heated500-2000 kg lime is added into the furnace, and bauxite is added according to the situation; the method of manually adding aluminum particles into the steel ladle is adopted, and a storage bin is not adopted for adding aluminum pills; the flow of argon blown by the ladle in the whole LF process is 5-15 Nm 3 H; before LF, the silicon, manganese, phosphorus and aluminum elements of the molten steel meet the target requirements.
7. The method for manufacturing the steel strip for the SPA-H weather-resistant container with high surface quality as claimed in claim 1, wherein the steps of: the continuous casting pouring period in the continuous casting procedure is controlled according to 38 min; the target temperature of the tundish molten steel is 1545-1560 ℃; the pouring process protects good pouring; under normal conditions, the argon blowing flow of the stopper rod is controlled to be less than or equal to 3L/min; the casting drawing speed is 1.1m/s.
8. The method for manufacturing the steel strip for the SPA-H weather-resistant container with high surface quality as claimed in claim 1, wherein the steps of: in the heating process, the charging temperature is less than or equal to 600 ℃, a high-temperature quick firing process is adopted, the temperature of a preheating section is 1100 ℃, the temperature of a heating section is 1150-1270 ℃, the retention time is 40-50min, the temperature of a soaking section is 1230 ℃, the discharging temperature of a plate blank is 1230-1270 ℃, and the temperature difference between the surface and the center of the plate blank is 40 ℃ when the plate blank is discharged.
9. The method for manufacturing the steel strip for the SPA-H weather-resistant container with high surface quality as claimed in claim 1, wherein the steps of: in the rolling process, the rolling process comprises the steps of,
1) In the aspect of scale removal: the high-pressure descaling box is used as one group, is not sprayed with the roughing mill for descaling, and has water pressure of 21-23 MPa, two groups of finish rolling descaling boxes are used on the roughing mill for 5 times, and the water pressure is 19-21 MPa;
2) The rough rolling process comprises the following steps: the roughing mill adopts 5 times of reversible reduction, and the thickness of the intermediate blank is 33-35mm; the width of the vertical roll is reduced by 20mm by throwing the vertical roll for 1/3/5 pass of the vertical roll;
3) Finish rolling process: the descaling water is used between the frames F1 and F2, the three frames F1, F3 and F5 are used for spraying reverse water, and the secondary scale is controlled; the rolling speed and the rolling load are set with reference to a model system.
10. The method for manufacturing the steel strip for the SPA-H weather resistant container with high surface quality as claimed in claim 1, wherein: in the layer cooling process, the coiling temperature is adjusted according to the iron scale composition principle, the target temperature is reduced by 20 ℃, meanwhile, a precision rolling outlet intensive cooling device is put into use, the front section is intensively cooled, and the water cooling speed is 15-22 ℃/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211295007.1A CN115505824A (en) | 2022-10-21 | 2022-10-21 | Manufacturing method of steel belt for SPA-H weather-resistant container with high surface quality |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211295007.1A CN115505824A (en) | 2022-10-21 | 2022-10-21 | Manufacturing method of steel belt for SPA-H weather-resistant container with high surface quality |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139687A (en) * | 2007-10-12 | 2008-03-12 | 莱芜钢铁集团有限公司 | Weather-resistant hot rolled broad steel strip and method for manufacturing same |
| CN106947915A (en) * | 2017-03-16 | 2017-07-14 | 宁波钢铁有限公司 | A kind of low-cost and high-performance SPA H coils of hot-rolled steel and preparation method thereof |
| CN107574387A (en) * | 2017-09-23 | 2018-01-12 | 武钢集团昆明钢铁股份有限公司 | A kind of weather-proof low-yield point damper steel plate of 225MPa levels and strip production methods |
| CN111719081A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Control method for reducing cost of steel optimized alloy for container |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139687A (en) * | 2007-10-12 | 2008-03-12 | 莱芜钢铁集团有限公司 | Weather-resistant hot rolled broad steel strip and method for manufacturing same |
| CN106947915A (en) * | 2017-03-16 | 2017-07-14 | 宁波钢铁有限公司 | A kind of low-cost and high-performance SPA H coils of hot-rolled steel and preparation method thereof |
| CN107574387A (en) * | 2017-09-23 | 2018-01-12 | 武钢集团昆明钢铁股份有限公司 | A kind of weather-proof low-yield point damper steel plate of 225MPa levels and strip production methods |
| CN111719081A (en) * | 2019-03-21 | 2020-09-29 | 本钢板材股份有限公司 | Control method for reducing cost of steel optimized alloy for container |
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