CN114686779A - High-corrosion-resistance weather-resistant steel and preparation method and application thereof - Google Patents
High-corrosion-resistance weather-resistant steel and preparation method and application thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 238000005260 corrosion Methods 0.000 claims abstract description 72
- 230000007797 corrosion Effects 0.000 claims abstract description 69
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 238000005098 hot rolling Methods 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 6
- 230000023556 desulfurization Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 45
- 229910000870 Weathering steel Inorganic materials 0.000 claims description 38
- 229910052802 copper Inorganic materials 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 description 15
- 239000000956 alloy Substances 0.000 description 15
- 239000011651 chromium Substances 0.000 description 13
- 238000005266 casting Methods 0.000 description 9
- 229910000604 Ferrochrome Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 229910000851 Alloy steel Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
-
- 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
- C21C7/068—Decarburising
-
- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses high-corrosion-resistance weather-resistant steel and a preparation method and application thereof, belonging to the technical field of steel smelting. The chemical components of the high corrosion-resistant and weather-resistant steel comprise, by mass, less than or equal to 0.12% of C, 1.90-2.30% of Si, less than or equal to 1.50% of Mn, 0.030-0.070% of P, less than or equal to 0.015% of S, 1.90-2.30% of Cr1, 0.10-0.40% of Ni, 0.20-0.60% of Cu, more than or equal to 0.010% of Als, and the balance of Fe and unavoidable impurities; the preparation method comprises the following steps: molten iron desulfurization → converter smelting → LF → RH → LF → slab continuous casting → hot rolling → laminar cooling → coiling. The weather resistant steel with high corrosion resistance has the atmospheric corrosion resistance index I of 11.03-12.19, has excellent atmospheric corrosion resistance, can be used in hot and humid areas in a naked mode, can be widely used for building, bridge construction or vehicle manufacturing, and has application value.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to high-corrosion-resistance weather-resistant steel and a preparation method and application thereof.
Background
The damage of steel corrosion to various fields of national economy and national defense construction is a common and serious problem. Statistically, in some industrially developed countries, the economic loss due to corrosion accounts for 2-4% of the total value of national economic production, wherein atmospheric corrosion is the main form of corrosion of steel structures, accounting for about half of the total corrosion loss. Therefore, the method has great significance for the research and development of the high-corrosion-resistant weathering steel.
The weathering steel is also named as atmospheric corrosion resistant steel, and is a low alloy steel with good corrosion resistance in the atmosphere. Through a large amount of research at home and abroad, at present, it is generally believed that after long-time exposure to the atmosphere, a layer of compact oxidation product with good adhesion is generated on the surface of the high-corrosion-resistance weathering steel, so that a steel matrix is isolated from external corrosive substances, and the corrosion resistance of the high-corrosion-resistance weathering steel is obviously improved. The domestic weathering steel is mainly used for railway vehicles, containers and the like, is more widely and naked and used in the fields of steel structure buildings and municipal facilities in foreign countries, and the maximum application of the weathering steel is to build bridges and expand the use of naked modes, such as: exterior components such as building roofs, shutters, steel ribs, exterior panel lights, and the like.
In order to meet the market demand, it is necessary to develop weathering steel having good corrosion resistance.
Disclosure of Invention
The invention aims to solve the technical problem that the existing weathering steel has poorer atmospheric corrosion resistance.
The technical scheme adopted by the invention for solving the technical problems is as follows: the high corrosion-resistant weathering steel comprises the following chemical components in percentage by mass: less than or equal to 0.12 percent of C, 1.90-2.30 percent of Si, less than or equal to 1.50 percent of Mn, 0.030-0.070 percent of P, less than or equal to 0.015 percent of S, 1.90-2.30 percent of Cr, 0.10-0.40 percent of Ni0, 0.20-0.60 percent of Cu, more than or equal to 0.010 percent of Als, and the balance of Fe and inevitable impurities.
Further, the high corrosion-resistant weathering steel comprises the following chemical components in percentage by mass: 0.06-0.08% of C, 2.00-2.20% of Si, 0.85-1.00% of Mn, 0.040-0.060% of P, less than or equal to 0.007% of S, 2.00-2.20% of Cr, 0.20-0.30% of Ni, Cu: 0.28-0.38%, Als: 0.015-0.050%, and the balance of Fe and inevitable impurities.
The weather resistant index I of the high corrosion resistant steel is 11.03-12.19.
The corrosion rate of the high corrosion-resistant weathering steel relative to Q355B is less than or equal to 30 percent.
The yield strength of the high corrosion-resistant weathering steel is 540-600MPa, the tensile strength is 750-850MPa, the elongation is more than or equal to 18 percent, and the impact value at minus 40 ℃ is more than or equal to 27J.
The invention also provides a preparation method of the high corrosion-resistant weathering steel, which comprises the following steps:
molten iron desulfurization → converter smelting → LF → RH refining → LF → slab continuous casting → hot rolling → laminar cooling → coiling.
Wherein, the charging [ S ] in the molten iron desulphurization procedure is controlled to be less than or equal to 0.002%; the end point [ C ] in the smelting process of the converter is controlled to be 0.04-0.06%, the [ S ] is less than or equal to 0.005%, and the tapping temperature is more than or equal to 1700 ℃.
Wherein, the outbound temperature in the first LF procedure is controlled to be 1640-; controlling [ C ] in the RH refining procedure to be less than or equal to 0.02 percent; controlling the outlet temperature in the second LF procedure to be 1590-1600 ℃; controlling delta T in the slab continuous casting process: 20 to 40 ℃.
Wherein, the rough rolling full length is descaled in the hot rolling procedure, the finish rolling start temperature is less than or equal to 1020 ℃, and the finish rolling temperature is 810-850 ℃; sparse cooling is adopted in the laminar cooling process; the coiling temperature in the coiling process is controlled to be 580-620 ℃.
The invention also provides application of the high-corrosion-resistance weathering steel in the fields of buildings, bridge construction or vehicle manufacturing, and exposed use in hot and humid areas.
The invention has the beneficial effects that: the high-corrosion-resistance weathering steel has simple components, the atmospheric corrosion resistance index I of the high-corrosion-resistance weathering steel prepared by combining with the preparation method of the invention is up to 11.03-12.19 and far higher than 6.0, and the excellent atmospheric corrosion resistance of the product is realized.
Because the alloy amount is added in the alloy smelting process of the invention, the temperature drop in the process is large, the alloy carburization and heating carburization are large, and the ferrochrome melting effect is poor due to the excessive temperature drop, so that the RH procedure insert tube is seriously bonded, so that the production requirement of the steel grade of the invention can not be met by the common converter smelting-LF-RH-slab continuous casting mode. Therefore, the invention adopts double LF procedures, although one LF procedure is added, the production cost is increased, the invention has more advantages in the effective utilization of temperature, component carbon and alloy (alloy loss phenomenon caused by adhesion of an insert tube is avoided) and the refining sulfur control efficiency, and the production risk is reduced to a great extent.
The steel has good atmospheric corrosion resistance, low later maintenance cost and long service life of products, and the full-period use cost is reduced; meanwhile, the environmental pollution is reduced, and the accident risk of corrosion failure is reduced. In addition, the high-corrosion-resistance weather-resistant steel can be used in hot and humid areas in an exposed mode, can be widely applied to the fields of buildings, bridge construction or vehicle manufacturing, and has good application value.
Detailed Description
The technical solution of the present invention can be specifically implemented as follows.
The high corrosion-resistant weathering steel comprises the following chemical components in percentage by mass: less than or equal to 0.12 percent of C, 1.90-2.30 percent of Si, less than or equal to 1.50 percent of Mn, 0.030-0.070 percent of P, less than or equal to 0.015 percent of S, 1.90-2.30 percent of Cr, 0.10-0.40 percent of Ni, 0.20-0.60 percent of Cu, more than or equal to 0.010 percent of Als, and the balance of Fe and inevitable impurities.
Preferably, the high corrosion-resistant weathering steel comprises the following chemical components in percentage by mass: 0.06-0.08% of C, 2.00-2.20% of Si, 0.85-1.00% of Mn, 0.040-0.060% of P, less than or equal to 0.007% of S, 2.00-2.20% of Cr, 0.20-0.30% of Ni, Cu: 0.28-0.38%, Als: 0.015-0.050%, and the balance of Fe and inevitable impurities.
Among them, since too high carbon content causes formation of large and coarse brittle carbide particles in steel which are unfavorable for plasticity and toughness, and also causes a segregation band in the center of steel sheet which is unfavorable for bending property and formability, and also increases welding carbon equivalent which is unfavorable for welding processing, the present invention is designed to have C less than or equal to 0.12%, preferably C0.06-0.08%. Because the excessive Mn content can cause casting blank cracks in the continuous casting process and can also reduce the welding performance of steel, the Mn content is less than or equal to 1.50 percent, and the Mn content is preferably 0.85 to 1.00 percent. Because S can form sulfide inclusion to deteriorate the performance of steel, and meanwhile, pitting corrosion expansion is easy to form in the corrosion process, and the corrosion performance is adversely affected, the S is less than or equal to 0.015 percent, and preferably less than or equal to 0.007 percent. Because the content of Al is too high, the nitrogen oxide of the Al is easy to precipitate at the austenite grain boundary to cause the generation of casting blank cracks, therefore, the invention designs that Als is more than or equal to 0.010 percent, and the preferable Als: 0.015-0.050%.
The contents of Si, P, Cu, Cr and Ni in the steel influence the calculated value of the atmospheric corrosion resistance index I, and the Si, P, Cu, Cr and Ni are main alloy elements for improving the atmospheric corrosion resistance of the steel; therefore, after the elements of C, Mn, S and Al are determined, in order to improve the atmospheric corrosion resistance, the contents of Si, P, Cu, Cr and Ni in the steel are determined based on an atmospheric corrosion resistance index calculation formula in appendix D guideline for evaluating the atmospheric corrosion resistance of low alloy steel in Weathering structural Steel (GB/T4171-2008): i ═ 26.01 (% Cu) +3.88 (% Ni) +1.20 (% Cr) +1.49 (% Si) +17.28 (% P) -7.29 (% Cu) (% Ni) -9.10 (% Ni) (% P) -33.39 (% Cu) 2.
When the content of Cu is too high, the melting point of the Cu is lower than the heating temperature of the steel billet, the precipitated Cu is gathered at an austenite crystal boundary in a liquid state, and cracks are easily generated during heating or hot rolling after the content of the precipitated Cu reaches a certain degree; while too low or too high a Cu content will reduce the calculated value of the atmospheric corrosion resistance index I, the present invention contemplates Cu 0.20-0.60%, preferably Cu0.28-0.38%. Too high Ni increases the adhesion of scale, hot rolling defects are formed on the surface by pressing into steel, Ni is a precious metal, and too high Ni content significantly increases the cost of steel alloy, so the present invention designs Ni 0.10-0.40%, preferably Ni 0.20-0.30%. Since too high Si content makes descaling difficult during rolling and also leads to a reduction in weldability, the present invention contemplates Si 1.90-2.30%, preferably Si 2.00-2.20%. Too high P content can significantly reduce the plasticity and low temperature toughness of the steel, so the invention designs P: 0.030 to 0.070%, preferably 0.040 to 0.060%. Since the production cost is increased by the excessively high Cr content, the present invention is designed to have Cr of 1.90-2.30%, preferably Cr of 2.00-2.20%.
The weather resistant steel has the weather resistant index I of 11.03-12.19, which is far greater than 6.0, and realizes excellent weather resistance of the product.
The corrosion rate of the high corrosion-resistant weathering steel relative to Q355B is less than or equal to 30 percent.
The yield strength of the high corrosion-resistant weathering steel is 540-600MPa, the tensile strength is 750-850MPa, the elongation is more than or equal to 18 percent, and the impact value at minus 40 ℃ is more than or equal to 27J.
The invention also provides a preparation method of the high-corrosion-resistance weathering steel, which comprises the following steps:
molten iron desulfurization → converter smelting → LF → RH refining → LF → slab continuous casting → hot rolling → laminar cooling → coiling.
Wherein, the main technical measures in the molten iron desulphurization procedure are deep desulphurization and desulfuration residue scraping, and the charging of [ S ] in the furnace needs to be controlled to be less than or equal to 0.002 percent; the main technical measures in the smelting process of the converter are controlling the resulfurization of the converter, controlling the end point temperature, reducing the slag discharge amount, adding ferrochromium and washing tapping slag, wherein the end point C is required to be controlled to be 0.04-0.06 percent, the S is less than or equal to 0.005 percent and the tapping temperature is more than or equal to 1700 ℃.
Wherein, the main technical measures in the first LF procedure are temperature regulation, ferrochrome addition and chromium component adjustment, and the outbound temperature needs to be controlled to be 1640-; the main technical measures in the RH refining procedure are vacuum decarburization and deoxidation, alloying of Als, Mn and Si, wherein [ C ] needs to be controlled to be less than or equal to 0.02 percent, and Als, Mn and Si meet the requirements; the main technical measures in the second LF procedure are temperature regulation, final alloy regulation, refining desulfurization, and the components need to be controlled to meet the requirements, and the outlet temperature is 1590-1600 ℃; the main technical measures in the slab continuous casting process are casting protection and low alloy steel casting powder, the casting speed needs to be controlled to be constant as much as possible, and the casting speed is delta T: 20-40 ℃.
In the smelting process of the high corrosion-resistant weather-resistant steel, the alloy amount is large, the temperature drop in the process is large, so that the alloy carburization and heating carburization are large, and the ferrochrome melting effect is poor due to the excessive temperature drop, so that the RH process insert tube is seriously bonded, and therefore, the production requirement of the steel cannot be met by a common converter smelting-LF-RH-slab continuous casting mode.
Therefore, the invention adopts double LF procedures, although one LF procedure is added, the production cost is increased, the invention has more advantages in the effective utilization of temperature, component carbon and alloy (alloy loss phenomenon caused by adhesion of an insert tube is avoided) and the refining sulfur control efficiency, and the production risk is reduced to a great extent. The ferrochrome entering the LF procedure for the first time is controlled by reducing the lower limit of the component requirement by 0.15 percent, and because the content of other alloy elements is low and easy to oxidize, the ferrochrome is not prepared when entering the LF for the first time, is primarily prepared after RH decarburization and deoxidation, and is finely adjusted after entering the LF for the second time.
In addition, in the hot rolling and layer cooling process of the high-corrosion-resistant weathering steel, the casting blank is hot-charged by hot delivery or immediately stacked and slowly cooled and charged in a furnace within 24 hours, the tapping temperature is 1210-; sparse cooling is adopted in the laminar cooling process; the coiling temperature in the coiling procedure is controlled to be 580-620 ℃.
For steel with high alloy content, the casting blank is easy to generate edge crack defects when the stacking time is long and the charging temperature is low, so the casting blank is subjected to hot conveying hot charging or is immediately stacked for slow cooling and is charged in 24 hours. Because the high Cr steel has strong hardenability and large cooling rate, martensite structure is easy to appear, and the toughness and plasticity of the product are adversely affected, so that cooling water between the racks is completely closed, the rolling speed can be reduced, and the cooling rate is reduced; meanwhile, laminar cooling adopts sparse cooling, and the cooling rate is reduced.
Based on the excellent corrosion resistance of the high corrosion-resistant weathering steel, the invention also provides the application of the high corrosion-resistant weathering steel, and the high corrosion-resistant weathering steel is used in the fields of buildings, bridge construction or vehicle manufacturing and is used in a hot and humid area in an exposed manner.
The technical solution and effects of the present invention will be further described below by way of practical examples.
Examples
The invention provides 3 groups of embodiments for preparing the high corrosion-resistant weathering steel by adopting the component proportion and the preparation method of the high corrosion-resistant weathering steel; in addition, 2 pairs of comparative examples are provided, wherein comparative example 1 is a normal high corrosion and weather resistant steel Q450NQR1, and comparative example 2 is a low alloy high strength steel Q355B. The distribution ratios of the components in the examples and the comparative examples of the invention are shown in table 1, the corrosion resistance of the prepared alloy steel is detected according to TB/T2375 test method of periodic infiltration corrosion test of high corrosion and weathering steel for railways, and the final atmospheric corrosion resistance index I and the relative Q355B corrosion rate are shown in table 1.
TABLE 1 examples and comparative examples Main Components (%) and Corrosion resistance
The embodiment and the comparative example show that the atmospheric corrosion resistance index I of the high corrosion-resistant weathering steel exceeds 6.0, is far greater than that of common high corrosion-resistant weathering steel and low-alloy high-strength steel, can realize excellent atmospheric corrosion resistance, can be used for bare or light coating in dry areas, reduces coating and rust removal cost, reduces failure accidents caused by corrosion, reduces environmental pollution, can be used in the fields of building, bridge construction or vehicle manufacturing, and has good application prospect.
Claims (10)
1. The high-corrosion-resistance weathering steel is characterized by comprising the following chemical components in percentage by mass: less than or equal to 0.12 percent of C, 1.90-2.30 percent of Si, less than or equal to 1.50 percent of Mn, 0.030-0.070 percent of P, less than or equal to 0.015 percent of S, 1.90-2.30 percent of Cr, 0.10-0.40 percent of Ni, 0.20-0.60 percent of Cu, more than or equal to 0.010 percent of Als, and the balance of Fe and inevitable impurities.
2. The high corrosion and weather resistant steel as claimed in claim 1, wherein the chemical composition is, in mass percent: 0.06-0.08% of C, 2.00-2.20% of Si, 0.85-1.00% of Mn, 0.040-0.060% of P, less than or equal to 0.007% of S, 2.00-2.20% of Cr, 0.20-0.30% of Ni0.20%, Cu: 0.28-0.38%, Als: 0.015-0.050%, and the balance of Fe and inevitable impurities.
3. The highly corrosion-resistant weathering steel according to claim 2, characterized in that: the atmospheric corrosion resistance index I of the high corrosion-resistant weathering steel is 11.03-12.19.
4. The highly corrosion-resistant weathering steel according to claim 2, characterized in that: the relative corrosion rate of Q355B of the high corrosion-resistant weathering steel is less than or equal to 30 percent.
5. The highly corrosion-resistant weathering steel according to claim 2, characterized in that: the yield strength of the high-corrosion-resistant weathering steel is 540-600MPa, the tensile strength is 750-850MPa, the elongation is more than or equal to 18%, and the impact value at minus 40 ℃ is more than or equal to 27J.
6. The method for preparing the highly corrosion-resistant and weathering steel according to any of claims 1 to 5, characterized by comprising the steps of:
molten iron desulfurization → converter smelting → LF → RH refining → LF → slab continuous casting → hot rolling → laminar cooling → coiling.
7. The method for preparing the high corrosion and weather resistant steel as claimed in claim 6, wherein: controlling the charging [ S ] in the molten iron desulphurization procedure to be less than or equal to 0.002%; the end point [ C ] in the smelting process of the converter is controlled to be 0.04-0.06%, the [ S ] is less than or equal to 0.005%, and the tapping temperature is more than or equal to 1700 ℃.
8. The method for preparing high corrosion and weather resistant steel according to claim 6, wherein: controlling the outbound temperature to be 1640-1650 ℃ in the first LF procedure; controlling [ C ] in the RH refining procedure to be less than or equal to 0.02 percent; controlling the outlet temperature in the second LF procedure to be 1590-1600 ℃; controlling delta T in the slab continuous casting process: 20-40 ℃.
9. The method for preparing high corrosion and weather resistant steel according to claim 6, wherein: the rough rolling full-length scale removal in the hot rolling procedure is carried out, the finish rolling initial temperature is less than or equal to 1020 ℃, and the finish rolling final temperature is 810-850 ℃; sparse cooling is adopted in the laminar cooling process; the coiling temperature in the coiling process is controlled to be 580-620 ℃.
10. Use of a highly corrosion and weathering resistant steel according to any of claims 1 to 5, characterized in that: the coating is used in the fields of buildings, bridge construction or vehicle manufacturing, and is exposed in hot and humid areas.
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