CN115807185B - Production method of low-cost high-strength atmospheric corrosion resistant container hot rolled steel strip Q450NQR1 for railway - Google Patents
Production method of low-cost high-strength atmospheric corrosion resistant container hot rolled steel strip Q450NQR1 for railway Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
- 230000007797 corrosion Effects 0.000 title claims abstract description 30
- 238000005260 corrosion Methods 0.000 title claims abstract description 30
- 238000005096 rolling process Methods 0.000 claims abstract description 40
- 238000010079 rubber tapping Methods 0.000 claims abstract description 11
- 230000009467 reduction Effects 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 6
- 239000004571 lime Substances 0.000 claims abstract description 6
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 239000000498 cooling water Substances 0.000 claims abstract description 4
- 230000004907 flux Effects 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 23
- 239000010949 copper Substances 0.000 claims description 22
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 14
- 229910052759 nickel Inorganic materials 0.000 claims description 12
- 238000007670 refining Methods 0.000 claims description 12
- 238000003723 Smelting Methods 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 6
- 238000005275 alloying Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- 229910000870 Weathering steel Inorganic materials 0.000 abstract description 9
- 238000013461 design Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 241000271039 Agkistrodon Species 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
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- 238000006722 reduction reaction Methods 0.000 description 1
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- 229910052720 vanadium Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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
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- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a low-cost high-strength atmospheric corrosion resistant container hot rolled steel strip Q450NQR1 production method for railways, which comprises the following steps: 1) The tapping temperature of the converter is 1630-1650 ℃; 2) Adding 9-11kg/t of refined lime into steel; soft blowing time is 5-10 minutes, and superheat degree is 24-28 ℃; 3) During continuous casting, special mold flux for weathering steel is adopted, and the tundish temperature is 1550-1560 ℃; 4) The tapping temperature is controlled between 1050 ℃ and 1090 ℃; 5) The rolling reduction of the continuous rolling mill F1 is more than or equal to 40%, the rolling reduction of the continuous rolling mill F2 is more than or equal to 33%, the final rolling temperature is 880-890 ℃, the cooling water temperature is 24-28 ℃, and the curling temperature is 560-600 ℃. The invention aims to provide a production method of a low-cost high-performance atmospheric corrosion resistant hot rolled steel strip Q450NQR1, which has the advantages of stable production process, excellent performance, good plate shape and good corrosion resistance.
Description
Technical Field
The invention relates to the field of hot rolled steel strips of CSP production lines, in particular to a method for producing a container hot rolled steel strip Q450NQR1 for a low-cost high-strength atmospheric corrosion-resistant railway.
Background
Q450NQR1 is an atmospheric corrosion resistant hot rolled steel strip for railway containers, is widely applied to industries such as railway vehicles, cable grooves, containers and the like, and is gradually popularized and applied to 450-700 MPa-level high-strength steel plates in China. Compared with the steel for common standard containers, the high-strength steel plate can reduce the weight by 15-40%, and can greatly save the transportation cost. Because of its special purpose, users put higher demands on the atmospheric corrosion resistance, the strong plasticity and the flatness of the steel strip after being opened.
The invention aims to solve the problems that the chemical components and the hot continuous casting and rolling process of 450 MPa-level atmospheric corrosion resistant steel are developed based on CSP production line process through reasonable component design, good mechanical property and corrosion resistance are obtained by utilizing Ti, cu, cr, ni and other alloy elements, the mechanical property, microstructure and corrosion resistance of the atmospheric corrosion resistant steel strip Q450NQR1 subjected to CSP test of steel are carefully researched through microalloying and controlled rolling and controlled cooling process, and the mechanical property, grain size and corrosion resistance of the atmospheric corrosion resistant steel strip Q450NQR1 meet the standard requirements of a hot rolled sheet of steel for railways.
The invention discloses a steel plate with high strength and high corrosion resistance and the production method thereof, the yield strength of which is 450MPa, with the publication number of CN103290331A, which adopts a conventional rolling mill process, and the addition of moderate-content alloy element Cr ensures that the steel has excellent atmospheric corrosion resistance. But the Cr content is 2.80-4.0%, the smelting difficulty is high, and the production is difficult. The technology route of the patent is different from that of the literature, the technology is based on the csp hot rolling continuous casting and rolling production technology, the microalloying low-cost component design is adopted, the mechanical property, the microstructure and the corrosion resistance are good, and the use requirements of users are met.
The invention discloses a steel with the yield strength of 450MPa for railway wagon parts and a production method thereof, which are disclosed in the publication number CN102925798A, wherein precious metal elements of Nb and V are added on the basis of C-Mn steel, and the steel has no corrosion resistance although the yield strength reaches more than 450 MPa. The patent adopts the design of micro-alloying low-cost components, has good mechanical property, microstructure and corrosion resistance, and meets the use requirement of users.
The patent with publication number CN 111534746A 'weathering steel for wide-width 450 MPa-level hot-rolled container and the manufacturing method thereof' provides a method for producing the weathering steel by adopting a conventional rolling mill, and overcomes the defects that the weathering steel for 450 MPa-level hot-rolled container has high cost and the user cannot normally use due to warping after opening the weathering steel. The method provides a production method of the hot rolled steel strip Q450NQR1 with atmospheric corrosion resistance based on a CSP production line technology, adopting Ti, nb, cu, cr, ni microalloy design, low-cost high-strength thin-specification technology design, and a controlled rolling and cooling technology.
Disclosure of Invention
The invention aims to provide a production method of a low-cost high-performance atmospheric corrosion resistant hot rolled steel strip Q450NQR1, which adopts a continuous casting and rolling process and has the advantages of stable production process, excellent performance, good plate shape and good corrosion resistance.
In order to solve the technical problems, the invention adopts the following technical scheme:
The invention discloses a production method of a container hot rolled steel strip Q450NQR1 for a low-cost high-strength atmospheric corrosion resistant railway, which comprises the following steps:
1) Smelting by adopting a single slag process at 1630-1650 ℃ of tapping temperature of the converter, deoxidizing and alloying low-carbon ferromanganese and ferrosilicon alloy, wherein the thickness of a slag layer of the converter is less than 50mm, the smelting time is more than 40 minutes, the tapping time is 6 minutes, and in order to stabilize the production time sequence, copper plates and nickel plate alloys are added into the converter during the steel production;
2) The addition amount of lime in the refining treatment process is 9-11kg/t of steel; refining soft blowing time is 5-10 minutes, and the superheat degree of molten steel is 24-28 ℃; deoxidized aluminum is added at one time in the refining process, so that the floating time of inclusions is ensured to be full;
3) When continuous casting is performed, special covering slag for weathering steel (the specific component percentage of the special covering slag for weathering steel is as follows: siO 2 30.78％,CaO 31.05％,Al2O3 4.93％,Na2O 8.68％,K2 O0.22%, density 0.73g/ml, melting point 1103 ℃, viscosity 1.52 Poise), ladle temperature 1550-1560 ℃, furnace temperature not less than 980 ℃ except mixed casting and tail blank, pulling speed average 3.8-4.0m/min;
4) The heating process comprises the following steps: strictly controlling the atmosphere in the heating furnace to be a reducing atmosphere, controlling the heating speed of a heating section to be 12-15 ℃/min, controlling the tapping temperature to be 1050-1090 ℃ and reducing the enrichment of copper on the grain boundary and the surface of a casting blank;
5) And (3) rolling and cooling processes: the rolling reduction of the continuous rolling mill F1 is more than or equal to 40%, the rolling reduction of the continuous rolling mill F2 is more than or equal to 33%, the final rolling temperature is set to 880-890 ℃, the cooling adopts concentrated laminar cooling before cooling, the cooling water temperature is 24-28 ℃, and the curling temperature is 560-600 ℃.
Further, the lime addition amount during the refining treatment is 10kg/t of steel.
Further, the tundish temperature was 1555 ℃.
Further, the steel strip comprises the following chemical components in percentage by mass of ：C：0.05～0.07％、Si：0.20～0.30％、Mn：0.60～0.70％、P：≤0.020％、S：≤0.009％、Als：0.17～0.27％、Cr：0.40～0.45％、Cu：0.3-0.45％、Ni：0.15-0.25％、Ti：0.45-0.65％、O:≤0.0040％％、N：≤0.0050％;, and the balance of iron and unavoidable impurities.
Further, the steel strip comprises the following chemical components in percentage by mass, wherein the balance of ：C：0.05％、Si：0.21％、Mn：0.62％、P：0.018％、S：0.006％、Als：0.24％、Cr：0.42％、Cu：0.38％、Ni：0.20％、Ti：0.50％、O:0.0042％％、N：0.0048％; is Fe and unavoidable impurities.
Further, the steel strip comprises the following chemical components in percentage by mass, wherein the balance of ：C：0.07％、Si：0.26％、Mn：0.66％、P：0.013％、S：0.004％、Als：0.26％、Cr：0.45％、Cu：0.41％、Ni：0.24％、Ti：0.58％、O:0.0030％％、N：0.0039％; is Fe and unavoidable impurities.
Further, the steel strip comprises the following chemical components in percentage by mass, wherein the balance of ：C：0.07％、Si：0.23％、Mn：0.64％、P：0.014％、S：0.006％、Als：0.23％、Cr：0.44％、Cu：0.40％、Ni：0.20％、Ti：0.57％、O:0.0028％％、N：0.0037％; is Fe and unavoidable impurities.
Further, the steel strip comprises the following chemical components in percentage by mass, wherein the balance of ：C：0.06％、Si：0.24％、Mn：0.66％、P：0.015％、S：0.005％、Als：0.22％、Cr：0.43％、Cu：0.36％、Ni：0.22％、Ti：0.52％、O:0.0032％％、N：0.0040％; is Fe and unavoidable impurities.
Compared with the prior art, the invention has the beneficial technical effects that:
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is an atmospheric corrosion resistant steel strip Q450NQR1 microstructure, wherein a, b, c, d are different thicknesses of the steel strip Q450NQR1 microstructure, respectively.
Detailed Description
A low-cost high-performance atmospheric corrosion resistant hot rolled steel strip Q450NQR1 production method comprises the following steps of enabling the steel strip to contain the chemical components in percentage by mass (unit, wt%) ：C：0.05～0.07、Si：0.20～0.30、Mn：0.60～0.70、P：≤0.020、S：≤0.009、Als：0.17～0.27、Cr：0.40～0.45、Cu：0.3-0.45、Ni：0.15-0.25、Ti：0.45-0.65、O:≤0.0040％、N：≤0.0050％; and the balance of iron and unavoidable impurities; the production method of the steel plate comprises KR desulfurization, converter, LF furnace, CSP continuous casting, heating furnace, CSP rolling mill, laminar cooling, curling, inspection, packing, jet printing and warehousing.
The production method specifically comprises the following steps:
1) The tapping temperature of the converter is 1630-1650 ℃, the single slag process is adopted for smelting, the low-carbon ferromanganese and ferrosilicon alloy are adopted for deoxidization alloying, and the thickness of the slag layer of the converter is less than 50mm. The smelting time is more than 40 minutes, the tapping time is 6 minutes, and in order to stabilize the production time sequence, copper plates and nickel plate alloys are added in a converter during the production of the steel. At present, copper plates of storage raw materials are single in weight, cu content component control requirements are narrow, and copper plates are adopted to match with waste oxygen lance copper heads during production.
2) The addition amount of lime in the refining treatment process is 10kg/t of steel, and the yield of low-carbon ferrochrome added during production is deviated from theoretical calculation to reach 39kg of Cr-adding amount of 0.01%. The refining soft blowing time of the test steel is 7 minutes, and the superheat degree of molten steel is 24-28 ℃. And taking an oxygen-nitrogen sample from the refining off-site, wherein the nitrogen content is 36ppm and 42ppm. Deoxidized aluminum is added at one time in the refining process, so that the floating time of the inclusions is ensured to be full.
3) When the steel is continuously cast, special covering slag for weathering steel (the specific component percentage of the special covering slag for weathering steel is as follows: siO 2 30.78％,CaO 31.05％,Al2O3 4.93％,Na2O 8.68％,K2 O0.22%, density 0.73g/ml, melting point 1103 deg.C, viscosity 1.52 Poise), ladle temperature 1555 deg.C, ladle composition hit test standard requirement except mixed casting and tail billet, pull rate average 3.8-4.0m/min.
4) The heating process comprises the following steps: the atmosphere in the heating furnace is strictly controlled to be a reducing atmosphere, the heating speed of the heating section is controlled to be 12-15 ℃/min, the tapping temperature is controlled to be 1050-1090 ℃, and the enrichment of copper on the grain boundary and the surface of a casting blank is reduced.
5) And (3) rolling and cooling processes: in order to ensure uniform plate shape performance, refine austenite grains and avoid mixed crystals, the rolling reduction of a continuous rolling mill F1 is more than or equal to 40%, the rolling reduction of F2 is more than or equal to 33%, the final rolling temperature is set to 880-890 ℃, the cooling adopts pre-concentrated laminar cooling, the cooling water temperature is 24-28 ℃, and the curling temperature is 560-600 ℃.
The focus of the invention as a whole is on:
(1) The steel Q450NQR1 for the steel-clad CSP hot-rolled railway container adopts the design of C-Mn-Ti-Nb-Cu-Cr-Ni alloy, and obtains good mechanical property and atmospheric corrosion resistance through the measures of microalloying, steel cleaning and purifying, tissue singulation, controlled rolling and controlled cooling process and the like, and various indexes of the product meet the standard requirements.
(2) The steel strip Q450NQR1 has the thickness of 5.8mm, 4.5mm, 3.0mm and 2.75mm, the structure types of the steel strip are ferrite and pearlite, the crystal grains are uniform and fine, the grain size is 11-12 grades, and the class A, class B and DS inclusions are 0.5 grade, 0.5 grade and 0.5 grade respectively, and the steel is pure and meets the standard requirements.
(3) The Q450NQR1 steel strip with the test production specification has stable head, tail and transverse mechanical properties, good cold forming and impact properties, and the relative corrosion rate of the Q450NQR1 steel strip is 48 percent, thereby meeting the standard requirements.
The invention has the outstanding advantages that on the basis of low-cost component design, the advantages of large reduction and short flow of the CSP rolling mill are fully exerted, the CSP process railway container Q550NQR1 and Q450NQR1 steel plates are developed, and the steel plates meeting the railway container performance, use and corrosion resistance are produced by adopting lower rolling load and high-efficiency rolling through researching Ti element and each microalloy action mechanism and adjusting and optimizing the reduction, rolling process, cooling mode and process.
The invention is further described below with reference to examples.
Example 1
The smelting chemical components with the mass percentage of ：C：0.05、Si：0.21、Mn：0.62、P：0.018、S：0.006、Als：0.24、Cr：0.42、Cu：0.38、Ni：0.20、Ti：0.50、O:0.0042％、N：0.0048％; and the balance of Fe and unavoidable impurities. The steel plate with the thickness of 5.8mm is rolled, the detailed rolling and heat treatment process is shown in table 1, and the mechanical properties are shown in table 2.
Example 2
The smelting chemical components with the mass percentage of ：C：0.07、Si：0.26、Mn：0.66、P：0.013、S：0.004、Als：0.26、Cr：0.45、Cu：0.41、Ni：0.24、Ti：0.58、O:0.0030％、N：0.0039％; and the balance of Fe and unavoidable impurities. The steel plate with the thickness of 4.5mm is rolled, the detailed rolling and heat treatment process is shown in table 1, and the mechanical properties are shown in table 2.
Example 3
The smelting chemical components with the mass percentage of ：C：0.07、Si：0.23、Mn：0.64、P：0.014、S：0.006、Als：0.23、Cr：0.44、Cu：0.40、Ni：0.20、Ti：0.57、O:0.0028％、N：0.0037％; and the balance of Fe and unavoidable impurities. The steel plate with the thickness of 3.0mm is rolled, the detailed rolling and heat treatment process is shown in table 1, and the mechanical properties are shown in table 2.
Example 4
The smelting chemical components with the mass percentage of ：C：0.06、Si：0.24、Mn：0.66、P：0.015、S：0.005、Als：0.22、Cr：0.43、Cu：0.36、Ni：0.22、Ti：0.52、O:0.0032％、N：0.0040％; and the balance of Fe and unavoidable impurities. The steel plate with the thickness of 2.75mm is rolled, the detailed rolling and heat treatment process is shown in table 1, and the mechanical properties are shown in table 2.
TABLE 1 main rolling process parameters of Q450NQR1
TABLE 2 mechanical Properties of various thicknesses of the trial Q450NQR1 Steel strip
TABLE 3 Q450NQR1 periodic infiltration test results
As shown in FIG. 1, microstructure and inclusion analysis were performed on steel strip samples with test thicknesses of 5.8mm, 4.5mm, 3.0mm and 2.75mm, the steel strip structures with various thicknesses were ferrite + pearlite, the crystal grains were fine and uniform, the grain sizes of FIGS. 1 (a) and (B) were 11 grades, the grain sizes of FIGS. 1 (c) and (d) were 12 grades, and the class A, class B and DS inclusions were 0.5 grade, 0.5 grade and 0.5 grade, and the steel was pure, meeting the product standard requirements.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (6)
1. A production method of a low-cost high-strength atmospheric corrosion resistant container hot rolled steel strip Q450NQR1 for a railway is characterized by comprising the following steps: the method comprises the following steps:
1) The tapping temperature of the converter is 1630-1650 ℃, a single slag process is adopted for smelting, low-carbon ferromanganese and ferrosilicon alloy are adopted for deoxidization alloying, the thickness of a slag layer of the converter is less than 50mm, the smelting time is more than 40 minutes, the tapping time is 6 minutes, and copper plates and nickel plate alloys are added into the converter during the production of the steel in order to stabilize the production time sequence;
2) The addition amount of lime in the refining treatment process is 9-11kg/t of steel; refining soft blowing time is 5-10 minutes, and the superheat degree of molten steel is 24-28 ℃; deoxidized aluminum is added at one time in the refining process, so that the floating time of inclusions is ensured to be full;
3) During continuous casting, special mold flux for weather-resistant steel is adopted, the ladle temperature is 1550-1560 ℃, the furnace temperature is not less than 980 ℃ except for mixed casting and tail blank, and the pulling speed is 3.8-4.0m/min on average;
4) The heating process comprises the following steps: strictly controlling the atmosphere in the heating furnace to be a reducing atmosphere, controlling the heating speed of a heating section to be 12-15 ℃/min, controlling the tapping temperature to be 1050-1090 ℃ and reducing the enrichment of copper on the grain boundary and the surface of a casting blank;
5) And (3) rolling and cooling processes: the rolling reduction of the continuous rolling mill F1 is more than or equal to 40%, the rolling reduction of the continuous rolling mill F2 is more than or equal to 33%, the final rolling temperature is 880-890 ℃, the cooling adopts the concentrated laminar cooling before cooling, the cooling water temperature is 24-28 ℃, and the curling temperature is 560-600 ℃;
The steel strip comprises the following chemical components in percentage by mass of ：C：0.05～0.07%、Si：0.20～0.30%、Mn：0.60～0.70%、P：≤0.020%、S：≤0.009%、Als：0.17～0.27%、Cr：0.40～0.45%、Cu：0.3-0.45%、Ni：0.15-0.25%、Ti：0.45-0.65%、O:≤0.0040%、N：≤0.0050%; and the balance of iron and unavoidable impurities.
2. The method for producing the low-cost high-strength atmospheric corrosion resistant railway container hot rolled steel strip Q450NQR1 according to claim 1, wherein: the addition amount of lime in the refining treatment process is 10 kg/t.
3. The method for producing the low-cost high-strength atmospheric corrosion resistant railway container hot rolled steel strip Q450NQR1 according to claim 1, wherein: the temperature of the tundish is 1555 ℃.
4. The method for producing the low-cost high-strength atmospheric corrosion resistant railway container hot rolled steel strip Q450NQR1 according to claim 1, wherein: the steel strip comprises the following chemical components in percentage by mass, wherein the balance of ：C：0.07%、Si：0.26%、Mn：0.66%、P：0.013%、S：0.004%、Als：0.26%、Cr：0.45%、Cu：0.41%、Ni：0.24%、Ti：0.58%、O:0.0030%、N：0.0039%; is Fe and unavoidable impurities.
5. The method for producing the low-cost high-strength atmospheric corrosion resistant railway container hot rolled steel strip Q450NQR1 according to claim 1, wherein: the steel strip comprises the following chemical components in percentage by mass, wherein the balance of ：C：0.07%、Si：0.23%、Mn：0.64%、P：0.014%、S：0.006%、Als：0.23%、Cr：0.44%、Cu：0.40%、Ni：0.20%、Ti：0.57%、O:0.0028%、N：0.0037%; is Fe and unavoidable impurities.
6. The method for producing the low-cost high-strength atmospheric corrosion resistant railway container hot rolled steel strip Q450NQR1 according to claim 1, wherein: the steel strip comprises the following chemical components in percentage by mass, wherein the balance of ：C：0.06%、Si：0.24%、Mn：0.66%、P：0.015%、S：0.005%、Als：0.22%、Cr：0.43%、Cu：0.36%、Ni：0.22%、Ti：0.52%、O:0.0032%、N：0.0040%; is Fe and unavoidable impurities.
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