CN114606450A - Manufacturing method of steel strip for high-strength heavy truck refitted cargo compartment - Google Patents
Manufacturing method of steel strip for high-strength heavy truck refitted cargo compartment Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 76
- 239000010959 steel Substances 0.000 title claims abstract description 76
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 48
- 230000008569 process Effects 0.000 claims abstract description 34
- 239000000956 alloy Substances 0.000 claims abstract description 7
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 47
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 42
- 229910052742 iron Inorganic materials 0.000 claims description 22
- 229910052786 argon Inorganic materials 0.000 claims description 21
- 238000007664 blowing Methods 0.000 claims description 20
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 18
- 239000002893 slag Substances 0.000 claims description 15
- 238000010079 rubber tapping Methods 0.000 claims description 14
- 238000009749 continuous casting Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229910000805 Pig iron Inorganic materials 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 3
- 229910001570 bauxite Inorganic materials 0.000 claims description 3
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 239000006187 pill Substances 0.000 claims description 3
- 230000000754 repressing effect Effects 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 230000003009 desulfurizing effect Effects 0.000 claims description 2
- 239000008188 pellet Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims 1
- 229910052804 chromium Inorganic materials 0.000 abstract description 8
- 239000011651 chromium Substances 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 6
- 239000010936 titanium Substances 0.000 abstract description 6
- 229910052719 titanium Inorganic materials 0.000 abstract description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 229910052758 niobium Inorganic materials 0.000 abstract description 4
- 239000010955 niobium Substances 0.000 abstract description 4
- 238000005096 rolling process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005728 strengthening Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 abstract description 2
- 239000003562 lightweight material Substances 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- 239000011572 manganese Substances 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000009847 ladle furnace Methods 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
-
- 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
-
- 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
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
- C21C7/10—Handling in a vacuum
-
- 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
-
- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (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 high-strength steel strip for a heavy truck refitted cargo compartment, which reasonably designs the contents of C, Si, Mn, Nb, Ti and Cr elements, takes titanium and chromium as main elements, fully exerts the strengthening effect of cheap micro-alloy elements, combines the actual cooling capacity of a production line, improves the hardenability of steel through chromium, reasonably sets a rolling and cooling control process, realizes stable production under the existing equipment capacity, ensures that the strength, elongation and impact toughness of the steel meet the requirements, ensures that the high-strength steel for the truck compartment has good machining performance, further reduces the design value of the thickness of the compartment due to further improvement of yield strength, and is a light-weight material for replacing the low-strength and thick-specification truck compartment steel.
Description
Technical Field
The invention belongs to the field of metallurgy, and relates to a manufacturing method of a steel strip for a high-strength heavy truck refitted cargo compartment.
Background
The steel for the automobile carriage is a special steel material specially used for manufacturing a heavy-duty automobile container, and is mainly used for manufacturing a bottom plate, a side plate and a carriage front door and a carriage rear door of a commercial automobile carriage, the thickness specification of a product is 2.0-12 mm, the corresponding thickness specifications are different according to different purposes of a modified vehicle, and because the environment for using the heavy-duty modified vehicle is complex, carriage parts not only require a steel plate to have extremely high yield strength and low-temperature impact performance, but also require good cold roll forming performance, and the product requires pure steel and few harmful and residual elements. At present, mainstream products comprise Q345XT, Q420XT, Q500XT, Q600XT, Q700XT and the like, and due to the development of modern metallurgical technology and the requirement of light weight of automobiles, on the premise that the total weight is not changed, in order to effectively reduce the weight of an automobile body and improve the weight of loaded goods, high-strength steel for carriage bodies is gradually an important material for various modified automobile manufacturers. The Q700XT is used as a top-grade product of hot-rolled high-strength steel, the material strength is higher than Q600XT, the material toughness is higher than NM450M, Q700XT meets the requirement of users on light weight, and the steel has lower production and use costs and high cost performance. Meanwhile, the product is suitable for various processing modes of shearing, bending and splitting, has excellent comprehensive mechanical properties and has wide market prospect in the coming years.
Disclosure of Invention
In view of the above, the invention aims to provide a method for manufacturing a high-strength steel strip for a heavy truck refitted cargo compartment, which adopts low-carbon, high-manganese, niobium, titanium and chromium composite reinforced microalloying components to ensure that each item of a tensile test reaches the standard, the elongation is more than or equal to 14 percent, and the longitudinal impact energy at the temperature of-20 ℃ is more than or equal to 40J, so that the use requirements of users are met.
In order to achieve the purpose, the invention provides the following technical scheme: a manufacturing method of a high-strength steel strip for a modified cargo compartment of a heavy truck comprises the following steps:
s1, preparing materials: c: 0.05 percent to 0.09 percent; si: less than or equal to 0.20 percent; mn: 1.40% -1.60%; and Als: 0.015% -0.040%; nb: 0.03-0.05%; ti: 0.095 to 0.13 percent; cr: 0.1% -0.3%; n: less than or equal to 0.0085 percent; the balance of Fe;
s2, molten iron pretreatment: pretreating the proportioned blast furnace molten iron with molten iron, deeply desulfurizing the molten iron by the molten iron, wherein the scrap steel is A-type scrap steel;
s3, converter process: the pretreated blast furnace molten iron enters a converter, and the smelting process focuses on the change of furnace conditions; end point T: the RH + LF process is 1650-1665 ℃, the end point [ C ] is less than or equal to 0.05 percent, the end point [ O ] is 500-850 PPm, and the tapping and slag pushing are good;
s4, CAS procedure: molten steel enters a station for temperature measurement and sampling, and aluminum particles are added to the slag surface of a steel ladle discharged from a CAS (CAS System for slag tapping) station by 60-100 kg/furnace;
s5, LF process: the molten steel enters a station, is heated, is added into a furnace with 500-2000 kg of lime, 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; before LF, the silicon, manganese, phosphorus and aluminum elements of the molten steel meet the target requirements, the calcium treatment capacity is controlled, the soft argon blowing time is more than or equal to 8min, and the molten steel of the continuous casting platform is calmed for more than or equal to 5 min;
s6, RH step: measuring the temperature, determining the oxygen and sampling after the molten steel enters RH circulation for 3 min; the circulation time after the alloy is added is not less than 3min, and the net circulation time of molten steel under the ultimate vacuum degree is required to be 6-10 min; the RH process time is controlled according to 50-55 min/furnace; after RH repressing, the ladle is not subjected to argon blowing stirring and calcium treatment, and the RH outbound temperature is ensured: and the temperature is more than or equal to 1540 ℃, and all alloy elements are controlled in place according to target requirements.
S7, continuous casting: controlling the continuous casting period according to 40 min; the target temperature of the tundish molten steel is 1545-1560 ℃; the pouring process protects good pouring, and the argon blowing flow of the stopper rod is controlled to be less than or equal to 3L/min under the normal condition; and the cutting, the length fixing and the conveying mode of the billet are executed according to the requirements of an MES system.
Optionally, in the step of S2, the [ S ] in the RH + LF process is less than or equal to 0.005%, and the target [ S ] is less than or equal to 0.003%.
Optionally, in the step S3, the steel material in the converter smelting process is deep desulfurized molten iron with steel edges, and steel slag, iron particles, and pig iron blocks should not be used.
Optionally, the tapping thick slag agent is 350-450 kg/furnace, and the refined lime is 600-800 kg/furnace. The tapping process is low-flow argon blowing (5-15 Nm3/h), and the tapping and CAS cannot be stirred by high-flow argon blowing.
Optionally, in the step S5, the argon blowing flow of the ladle in the whole LF process is 5-15 Nm3/h, and the large-flow argon blowing stirring cannot be carried out;
optionally, in the step S6, the inbound oxygen content is required to be 300 to 700 PPm; RH adopts the treatment mode, and the ultimate vacuum degree is less than or equal to 273 Pa; optionally, aluminum pellets are added for deoxidation or aluminum alloying.
The invention has the beneficial effects that: the invention relates to a manufacturing method of a high-strength steel strip for a heavy truck refitted cargo compartment, which reasonably designs the contents of C, Si, Mn, Nb, Ti and Cr elements, adopts titanium and chromium as main elements, fully exerts the strengthening effect of cheap microalloy elements, combines the actual cooling capacity of a production line, improves the hardenability of steel through chromium, and reasonably sets a rolling and cooling control process, realizes stable production under the existing equipment capacity, ensures that the strength, elongation and impact toughness of the steel meet the requirements, so that the high-strength steel for the truck compartment has good mechanical processing performance, further reduces the design value of the thickness of the compartment due to further improvement of yield strength, and is a light weight material for replacing low-strength thick-specification compartment steel.
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 will be realized and attained by the structure particularly pointed out in the written description and claims thereof.
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.
In the concrete embodiment, according to the method,
the invention discloses an automobile beam steel strip with excellent performance and low cost and a manufacturing method thereof, which adopts the design idea of low-carbon, high-manganese, niobium, titanium and chromium composite strengthening microalloying components, and the contents of the chemical components are as follows (in weight percentage): c: 0.05 percent to 0.09 percent; si: less than or equal to 0.20 percent; mn: 1.40% -1.60%; and Als: 0.015% -0.040%; nb: 0.03-0.05%; ti: 0.095 to 0.13 percent; cr: 0.1 to 0.3 percent; n: less than or equal to 0.0085 percent; the balance of Fe and inevitable impurities, so that each item of the tensile test reaches the standard, the elongation is more than or equal to 14%, and the longitudinal impact energy at minus 20 ℃ is more than or equal to 40J, thereby meeting the use requirements of users.
Molten iron: the molten iron is deeply desulfurized (RH + LF process [ S ] is less than or equal to 0.005%, target [ S ] is less than or equal to 0.003%, and the scrap steel is A-type scrap steel (full steel edge).
A converter process: the steel materials in the converter smelting process are deep desulfurization molten iron and steel edges, and slag steel, iron particles and pig iron blocks cannot be used. The smelting process focuses on the change of furnace conditions. End point T: the RH + LF process is 1650-1665 ℃, the end point [ C ] is less than or equal to 0.05%, and the end point [ O ] is 500-850 PPm. The slag blocking during tapping is good; 350-450 kg of tapping thick slag agent and 600-800 kg of refined lime. The tapping process is low-flow argon blowing (5-15 Nm3/h), and the tapping and CAS cannot be stirred by high-flow argon blowing.
CAS procedure: molten steel enters a station for temperature measurement and sampling, and aluminum particles are added on the slag surface of a steel ladle when the CAS is out of the station by 60-100 kg/furnace.
An LF procedure: the LF process mainly aims at heating, fine adjustment of components and white slag formation. The molten steel enters the station and is heated up, and then 500-2000 kg of lime is added into the furnace, 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 argon blowing flow of the ladle in the whole LF process is 5-15 Nm3/h, and large-flow argon blowing stirring cannot be performed. Before LF, the silicon, manganese, phosphorus and aluminum elements of the molten steel meet the target requirements, the calcium treatment capacity is controlled, the soft argon blowing time is more than or equal to 8min, and the molten steel of the continuous casting platform is calmed for more than or equal to 5 min.
RH process: and (3) measuring the temperature, determining the oxygen and sampling after the molten steel enters RH circulation for 3 min. The on-site oxygen content is required to be 300-700 PPm. RH adopts the treatment mode, and the ultimate vacuum degree is less than or equal to 273 Pa. Optionally, aluminum shot deoxidation or aluminum alloying is added. The cycle time after the alloy is added is not less than 3 min. The net circulation time of the molten steel under the ultimate vacuum degree is required to be 6-10 min. The RH process time is controlled according to 50-55 min/furnace. After RH repressing, the ladle is not blown with argon and stirred and is not treated with calcium. Ensuring the RH outbound temperature: and the temperature is more than or equal to 1540 ℃, and all alloy elements are controlled in place according to target requirements.
And (3) continuous casting process: the continuous casting period is controlled according to 40 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. And the cutting, the length fixing and the conveying mode of the billet are executed according to the requirements of an MES system.
The invention has the technical characteristics that: the method comprises the steps of utilizing blast furnace molten iron, carrying out molten iron pretreatment, converter smelting, LF (ladle furnace) desulfurization and RH (relative humidity) vacuum degassing treatment, and carrying out proper casting blank drawing speed at a heating temperature of 1240-1270 ℃, wherein the total time of a heating furnace is more than or equal to 190min, the finish rolling inlet temperature is more than or equal to 1050 ℃, the finish rolling temperature is 840-880 ℃, the coiling temperature is 570-640 ℃, the layer cooling mode is front-section intensive cooling, and the water cooling speed is 10-25 ℃/s.
The steel of the invention has reasonable chemical component design, simple requirements on production conditions, controllable production process, 17% elongation average value, 59J of standard test impact performance average value at minus 20 ℃ and 123J of maximum value; the product is developed successfully under the existing conditions and has good machining capability.
The attached table is an example of 4 batches of steel strip melting compositions.
The attached table II shows an example of the process control of 4 batches of steel strips.
The third attached table is 4 batches of examples of the mechanical properties and the technological properties of the steel strip.
Attached watch 1
Attached watch 2
Attached table III
Remarking: less than 6mm without impact.
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 (6)
1. The manufacturing method of the steel strip for the modified cargo compartment of the high-strength heavy truck is characterized by comprising the following steps of:
s1, blending: c: 0.05 percent to 0.09 percent; si: less than or equal to 0.20 percent; mn: 1.40 to 1.60 percent; and Als: 0.015% -0.040%; nb: 0.03-0.05%; ti: 0.095 to 0.13 percent; cr: 0.1% -0.3%; n: less than or equal to 0.0085 percent; the balance of Fe;
s2, molten iron pretreatment: pretreating the proportioned blast furnace molten iron with molten iron, deeply desulfurizing the molten iron by the molten iron, wherein the scrap steel is A-type scrap steel;
s3, converter process: the pretreated blast furnace molten iron enters a converter, and the smelting process focuses on the change of furnace conditions; end point T: the RH + LF process is 1650-1665 ℃, the end point [ C ] is less than or equal to 0.05 percent, the end point [ O ] is 500-850 PPm, and the tapping and slag pushing are good;
s4, CAS procedure: molten steel enters a station for temperature measurement and sampling, and aluminum particles are added to the slag surface of a steel ladle discharged from a CAS (CAS System for slag tapping) station by 60-100 kg/furnace;
s5, LF process: the molten steel enters a station, is heated, is added into a furnace with 500-2000 kg of lime, 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; before LF, the silicon, manganese, phosphorus and aluminum elements of the molten steel meet the target requirements, the calcium treatment capacity is controlled, the soft argon blowing time is more than or equal to 8min, and the molten steel of the continuous casting platform is calmed for more than or equal to 5 min;
s6, RH step: measuring the temperature, determining the oxygen and sampling after the molten steel enters RH circulation for 3 min; the circulation time after the alloy is added is not less than 3min, and the net circulation time of molten steel under the ultimate vacuum degree is required to be 6-10 min; the RH process time is controlled according to 50-55 min/furnace; after RH repressing, the ladle is not subjected to argon blowing stirring and calcium treatment, and the RH outbound temperature is ensured: and the temperature is more than or equal to 1540 ℃, and all alloy elements are controlled in place according to target requirements.
S7, continuous casting: the continuous casting pouring period is controlled according to 40 min; the target temperature of the tundish molten steel is 1545-1560 ℃; the pouring process protects good pouring, and the argon blowing flow of the stopper rod is controlled to be less than or equal to 3L/min under the normal condition; and the cutting, the length fixing and the conveying mode of the billet are executed according to the requirements of an MES system.
2. The method for manufacturing a high-strength steel strip for a modified cargo compartment of a heavy-duty car according to claim 1, wherein: in the step of S2, the [ S ] of the RH + LF process is less than or equal to 0.005 percent, and the target [ S ] is less than or equal to 0.003 percent.
3. The method for manufacturing a high-strength steel strip for a modified cargo compartment of a heavy-duty car according to claim 1, wherein: in the step S3, the steel material in the converter smelting process is deep desulfurization molten iron with steel edges, and steel slag, iron particles and pig iron blocks cannot be used.
4. The method for manufacturing a high-strength steel strip for a modified cargo compartment of a heavy-duty car according to claim 1, wherein: 350-450 kg of tapping thick slag agent and 600-800 kg of refined lime. The tapping process is low-flow argon blowing (5-15 Nm3/h), and the tapping and CAS cannot be stirred by high-flow argon blowing.
5. The method for manufacturing a high-strength steel strip for a modified cargo compartment of a heavy-duty car according to claim 1, wherein: in the step S5, the argon flow rate of ladle blowing in the whole LF process is 5-15 Nm3And h, the large-flow argon blowing stirring is not required.
6. The method for manufacturing the high-strength steel strip for the modified cargo compartment of the heavy truck as claimed in claim 1, wherein: in the step S6, the inbound oxygen content is required to be 300-700 PPm; RH adopts the treatment mode, and the ultimate vacuum degree is less than or equal to 273 Pa; optionally, aluminum pellets are added for deoxidation or aluminum alloying.
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