CN113862570A - High-strength sulfuric acid dew point corrosion resistant steel and production method thereof - Google Patents
High-strength sulfuric acid dew point corrosion resistant steel and production method thereof Download PDFInfo
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- CN113862570A CN113862570A CN202111134176.2A CN202111134176A CN113862570A CN 113862570 A CN113862570 A CN 113862570A CN 202111134176 A CN202111134176 A CN 202111134176A CN 113862570 A CN113862570 A CN 113862570A
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000010935 stainless steel Substances 0.000 title claims description 6
- 238000004519 manufacturing process Methods 0.000 title abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 52
- 239000010959 steel Substances 0.000 claims abstract description 52
- 230000007797 corrosion Effects 0.000 claims abstract description 34
- 238000005260 corrosion Methods 0.000 claims abstract description 34
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 description 34
- 238000000034 method Methods 0.000 description 17
- 238000001816 cooling Methods 0.000 description 10
- 239000010949 copper Substances 0.000 description 10
- 239000011572 manganese Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000005728 strengthening Methods 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 238000009749 continuous casting Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 229910052718 tin Inorganic materials 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 229910052787 antimony Inorganic materials 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- -1 and in addition Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910001000 nickel titanium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—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
- C22C38/40—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
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a high-strength steel for resisting sulfuric acid dew point corrosion and a production method thereof, belonging to the field of steel production, wherein the steel comprises the following chemical components in percentage by mass: c: 0.03 to 0.07%, Si: 0.20 to 0.30%, Mn: 1.20-1.60%, P: not more than 0.020%, S not more than 0.020%, Cu: 0.20-0.55%, Ni: 0.12-0.20%, Cr: 0.30-0.60%, Mo 0.15-0.25%, Al: 0.015-0.040%; the balance being Fe and unavoidable impurities. Compared with the prior art have corrosion-resistant, high strength's characteristics.
Description
Technical Field
The invention relates to special steel and a production method thereof, in particular to high-strength sulfuric acid dew point corrosion resistant steel and a production method thereof.
Background
In the industries of petroleum, chemical industry, electric power, metallurgy and the like, coal and heavy oil are often used as main fuels, the sulfur content of the fuels is high, and gas generated in the combustion process contains SO2And further oxidized to form SO3When the temperature of the flue gas is reduced to be lower than the dew point temperature or the flue gas is contacted with the pipe wall of the flue gas duct with lower temperature, SO in the flue gas3The problem of severe corrosion of flue and flue duct walls due to the formation of high-concentration sulfuric acid by the action of water vapor is mainly solved by using sulfuric acid dew point corrosion resistant steel.
At present, in the steel for resisting sulfuric acid dew point corrosion which is used or disclosed at home and abroad, the Cu-Cr-Sb (Sn) series components are mainly used, for example, in CN201010019534.0, a steel for resisting sulfuric acid dew point corrosion and a preparation method thereof, the molten steel comprises the following chemical components: c: 0.03 to 0.08 wt%, Si: 0.10-0.45 wt%, Mn: 0.40-1.0 wt%, P: less than or equal to 0.025 wt%, S: less than or equal to 0.035 wt%, Cu: 0.15-0.50 wt%, Cr: 0.40 to 1.0 wt%, Sb: 0.02-0.15 wt%, Ni: 0.04-0.30 wt%, Ti: 0.01-0.05 wt%, N: less than or equal to 100 PPm. However, the general strength of the system steel is low, the tensile strength is generally less than 550MPa, and the fracture and the damage of bearing parts such as chimney equipment and the like are easily caused.
In recent years, new system component designs such as a Cu-Cr-Ni-Ti system and a Cu-Cr-Ni-V system are searched in the industry, but TiC can be separated out from Ti in the cooling process after finish rolling, and although the TiC can play a good precipitation strengthening effect, the TiC is firstly combined with N in steel at high temperature to form large-particle TiN at a grain boundary so as to reduce the corrosion resistance of the steel; v has a strong precipitation strengthening effect, but VN and VC have relatively low precipitation temperatures, so that the effect of inhibiting the growth of steel austenite grains in the heating furnace is limited, and the fine grain strengthening effect is not obvious.
Therefore, there is a need for a method of producing steel that is resistant to sulfuric acid dew point corrosion and whose product maintains high strength.
Disclosure of Invention
The technical task of the invention is to provide a high-strength steel for resisting sulfuric acid dew point corrosion and a production method thereof aiming at the defects of the prior art, the yield strength of the steel is more than or equal to 550MPa, the tensile strength is more than or equal to 600MPa, the elongation (A) is more than or equal to 18 percent, the corrosion resistance is equivalent to that of the conventional steel for resisting sulfuric acid dew point corrosion, the steel has excellent cold bending forming performance, and the preparation process is simple.
The invention provides a high-strength steel for resisting sulfuric acid dew point corrosion and a production method thereof, and compared with the conventional steel for resisting sulfuric acid dew point corrosion, the high-strength steel has obviously excellent performance. In addition, because the alloy elements are relatively simple, the influence of Sb element on the hot brittleness of the steel is avoided, the rolling process is relatively easy, and the method is favorable for batch industrial production.
The technical scheme for solving the technical problem is as follows: a high-strength steel for resisting sulfuric acid dew point corrosion is characterized in that: the chemical components and the mass percentage content are as follows: c: 0.03 to 0.07%, Si: 0.20 to 0.30%, Mn: 1.20-1.60%, P: not more than 0.020%, S not more than 0.020%, Cu: 0.20-0.55%, Ni: 0.12-0.20%, Cr: 0.30-0.60%, Mo 0.15-0.25%, Al: 0.015-0.040%; the balance being Fe and unavoidable impurities.
Further, the Cr + Mo content is more than or equal to 0.45 percent.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the steel for resisting the sulfuric acid dew point corrosion has good corrosion resistance;
2. the steel has excellent mechanical properties, the yield strength is more than or equal to 550MPa, the tensile strength is more than or equal to 600MPa, the elongation is more than or equal to 18 percent, and compared with the conventional sulfuric acid dew point corrosion resistant steel, the steel has obviously excellent strength performance and good welding performance;
3. the steel is designed by adopting Cu-Cr-Ni-Mo series components, compared with the Cu-Cr-Sb series, the use of Sb element is removed, the alloy elements are relatively simple, the influence of the Sb element on the hot brittleness of the steel is avoided, and the rolling process is easier;
4. the process of the invention replaces cold with heat, has low energy consumption, low pollution, short production time and strong market competitiveness;
5. the production process of the steel adopts two-stage rolling, wherein the austenite recrystallization region is rolled in the first stage, and the austenite is thinned by adopting large-deformation rolling; and in the second stage, rolling in an unrecrystallized area, further refining the structure, generating a deformation zone, increasing phase change nucleation points, facilitating the obtainment of fine structures, improving the strength and low-temperature toughness of the steel, being easy to control and being easy for industrial production.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The invention relates to a high-strength steel for resisting sulfuric acid dew point corrosion, which comprises the following chemical components in percentage by mass: c: 0.03 to 0.07%, Si: 0.20 to 0.30%, Mn: 1.20-1.60%, P: not more than 0.020%, S not more than 0.020%, Cu: 0.20-0.55%, Ni: 0.12-0.20%, Cr: 0.30-0.60%, Mo 0.15-0.25%, Al: 0.015-0.040%; the balance being Fe and unavoidable impurities.
The main alloying element content of the invention is based on the following principle:
c: the steel can improve strength and is a main interstitial solid solution strengthening element, but the welding performance, the forming performance and the impact toughness of the steel can be obviously deteriorated due to the excessively high content of C, pearlite transformation can be promoted, the atmospheric corrosion resistance of the steel can be reduced, and peritectic reaction can occur during molten iron solidification in the slab continuous casting process when the content of C is high, so that cracks are easily generated on the surface of a slab, and the surface quality of a finished product is influenced. The invention adopts low-C design, and the C content is 0.03-0.07%.
Si: the strength of the steel can be improved through solid solution strengthening, the atmospheric corrosion resistance of the steel can also be improved, the segregation of manganese and phosphorus can be inhibited by a proper amount of silicon, when the content of Si is lower than 0.20%, the smelting cost is increased, and when the content of Si is higher than 0.30%, the surface of a hot-rolled steel plate is easy to be rough, so that the content of Si in the invention is 0.20-0.30%.
Mn: the strength can be improved through solid solution strengthening, the phase transition temperature of the steel can be reduced, the crystal grains can be refined, and the comprehensive performance of the steel can be improved, wherein the Mn content is 1.20-1.60%.
P, S: p is easy to cause segregation in steel, welding performance is deteriorated, impact toughness of the steel is obviously reduced, brittle transition temperature is improved, S is easy to combine with Mn to generate MnS inclusions, and forming performance of the steel is influenced, so that the P and S elements are reduced as much as possible.
Cu: the Cu is a basic element for improving the corrosion resistance of the steel, and the enrichment of the Cu in the rust layer can greatly improve the protection of the rust layer. However, when the content is too high, cracks are easily generated on the surface of the steel in the heating process, and the hot brittleness of copper is caused, wherein the content of Cu is 0.20-0.55%.
Cr, Ni: the alloy elements are alloy elements for improving the corrosion resistance of the steel, the corrosion resistance effect of the coordination of Cr, Ni and Cu is better, the electrode potentials of the Cr and the Ni are lower and have passivation tendency, so that the corrosion resistance is improved, and in addition, the Ni element can reduce the hot brittleness influence caused by the Cu element in the hot rolling process. In the invention, the content of Cr is 0.30-0.60%, and the content of Ni is 0.12-0.20%. In the optimized scheme, the Cr: ni is 2-3: 1.
Mo: sb, Sn, Cr, and Mo are also effective elements for improving acid dew point corrosion resistance by the action of a slow electrochemical cathode-anode reaction. In the cold rolling annealing obtained by the subsequent annealing (annealing temperature 600 to 830 ℃) of the hot rolled steel sheet, the remarkable effect of improving the acid dew point corrosion resistance can be obtained by optimizing the contents of Cr and Mo and making the grain size of ferrite fine, and the general contents are selected from 0.10 to 0.25% of Cr and 0.03 to 0.07% of Mo (CN201580016949.3 'steel sheet excellent in acid dew point corrosion resistance, manufacturing method and exhaust gas flow path component', and when the Mo content exceeds 0.09%, the average grain size of ferrite is less than 12.0 μm, but the acid dew point corrosion resistance is remarkably lower than that of other groups. In recent years, the hot cooling is gradually the mainstream due to its high efficiency and energy saving, and the addition of the above proportion in the continuous casting and rolling process of thin slabs can not realize the refinement of ferrite grains without the participation of an annealing process, and further can not improve the acid resistance dew point corrosion. In the invention, the content of Cr is 0.30-0.60%, the content of Mo is 0.15-0.25%, and the content of Cr + Mo is more than or equal to 0.45%. In the optimized scheme, the Cr: mo is 2: 1. Under the matching of the proportion, Cr-Mo can effectively realize the dispersion of fine grains, is beneficial to obtaining fine and uniform tissues after rolling, improves the strength and the low-temperature toughness of steel, is beneficial to improving the welding performance, does not cause the waste of alloy and has the highest cost performance.
The invention is characterized in that the invention does not contain metal components such as Sb, Sn, Nb and V, and the reason is that Sb and Sn strongly promote the formation of pearlite, and segregation compounds are easily formed, thus reducing the toughness and corrosion resistance of steel, and in addition, Sb and Sn have toxicity and potential safety hazards in the production and storage processes; nb and V belong to precious metal elements, and although the addition of Nb and V can effectively promote fine grain strengthening and precipitation strengthening, the cost is high.
The performance indexes of the steel for resisting the dew point corrosion of the sulfuric acid are as follows: the yield strength is more than or equal to 550MPa, the tensile strength is more than or equal to 600MPa, and the elongation is more than or equal to 18 percent.
The production method of the steel for resisting the dew point corrosion of the sulfuric acid comprises the following steps: converter smelting, LF refining, slab continuous casting, slab heating, high-pressure water descaling, controlled rolling, controlled cooling and reeling. And the controlled rolling process comprises rough rolling, coiling of a hot coil box, finish rolling, laminar cooling and coiling.
In the slab heating procedure, the slab is heated to 1230-1270 ℃ in a hot charging mode, and the heating time is controlled to 140-200 min. The high-temperature quick firing is adopted, so that the full redissolution of alloy elements and better plasticity during rolling are ensured, and the requirements of the rolling process are met.
In the high-pressure water descaling process, the descaling water pressure is more than or equal to 18 MPa. And the scale is removed by adopting high-pressure water, so that the complete removal of the surface iron oxide scale is ensured, and the surface quality requirement is met.
In the rough rolling procedure, rough rolling is reversible rolling in 5 passes, the thickness of an intermediate blank is 32-40 mm, and the outlet temperature of the last pass of rough rolling is 1080-1140 ℃.
The coiling speed of the coiling procedure of the hot coiling box is 5.5 m/s. The invention adopts Cu-Cr-Ni-Mo series components, Mo can obviously delay the recrystallization speed, and a coiling procedure of a coil box is adopted in two-stage rolling, so that the dynamic recrystallization and grain growth process after rough rolling can be inhibited, most of austenite after rough rolling and refining is ensured to be reserved, the generation of fine tissues in the finish rolling process is facilitated, and the strength and the low-temperature toughness of steel are improved.
In the finish rolling process, the finish rolling is 7-pass continuous rolling, and the finish rolling temperature is 840-900 ℃.
The cooling process is controlled, and the cooling rate is more than or equal to 22 ℃/s.
In the coiling procedure, the coiling cooling adopts front-section concentrated cooling, and the coiling temperature is 600-650 ℃.
To better compare the formulations of the present application with the prior art, comparative tests were performed.
The control group and the groups of examples 1 to 6 are designed by adopting Cu-Cr-Ni-Mo series components, wherein the content of Mo in the control group is 0.7 percent, and the content of Cr and Mo in the control group is 0.26 percent; in examples 1 to 6, the Mo content was 0.15 to 0.25% and the Cr + Mo content was 0.45 to 0.84%. In particular, see the following table:
| C | Si | Mn | P | S | Al | Cu | Ni | Cr | Mo | |
| control group | 0.034 | 0.29 | 0.81 | 0.012 | 0.009 | 0.025 | 0.29 | 0.15 | 0.22 | 0.18 |
| Example 1 | 0.049 | 0.21 | 1.54 | 0.016 | 0.001 | 0.04 | 0.21 | 0.15 | 0.3 | 0.15 |
| Example 2 | 0.068 | 0.25 | 1.23 | 0.015 | 0.002 | 0.022 | 0.55 | 0.16 | 0.59 | 0.25 |
| Example 3 | 0.039 | 0.28 | 1.53 | 0.012 | 0.014 | 0.015 | 0.27 | 0.14 | 0.38 | 0.15 |
| Example 4 | 0.054 | 0.24 | 1.51 | 0.011 | 0.002 | 0.022 | 0.38 | 0.16 | 0.34 | 0.17 |
| Example 5 | 0.031 | 0.25 | 1.52 | 0.019 | 0.001 | 0.033 | 0.26 | 0.15 | 0.42 | 0.18 |
| Example 6 | 0.055 | 0.27 | 1.58 | 0.014 | 0.001 | 0.027 | 0.47 | 0.12 | 0.52 | 0.22 |
The control group and the examples 1 to 6 all adopt a thin slab continuous casting and rolling technology, and the production method comprises the following steps: converter smelting, LF refining, slab continuous casting, slab heating, high-pressure water descaling, controlled rolling, controlled cooling and reeling; and the controlled rolling process comprises rough rolling, finish rolling, laminar cooling and coiling. The difference is that the hot coil coiling procedure is carried out between the rough rolling and the finish rolling in the groups of examples 1-6, while the procedure is not carried out in the control group.
The specific control parameters for each group are as follows:
the comparison results are shown in the following table:
from the above results, it can be seen that although the control group is the technology of continuous casting and rolling of thin slabs designed for Cu-Cr-Ni-Mo series compositions, the Mo content is too low, and although the corrosion resistance can reach the lower limit of the product requirement, the strength and the low temperature impact toughness are low. By using the system and the production process of the invention, the resistance to sulfuric acid dew point corrosion meets the product requirements, the mechanical property is excellent, the yield strength is not less than 550MPa, the tensile strength is not less than 600MPa, the elongation is not less than 18%, and the performance is obviously excellent compared with the conventional steel for resisting sulfuric acid dew point corrosion.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (2)
1. A high-strength steel for resisting sulfuric acid dew point corrosion is characterized in that: the chemical components and the mass percentage content are as follows: c: 0.03 to 0.07%, Si: 0.20 to 0.30%, Mn: 1.20-1.60%, P: not more than 0.020%, S not more than 0.020%, Cu: 0.20-0.55%, Ni: 0.12-0.20%, Cr: 0.30-0.60%, Mo 0.15-0.25%, Al: 0.015-0.040%; the balance being Fe and unavoidable impurities.
2. The high-strength sulfuric acid dew point corrosion resistant steel according to claim 1, characterized in that: the Cr + Mo content is more than or equal to 0.45 percent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111134176.2A CN113862570A (en) | 2021-09-27 | 2021-09-27 | High-strength sulfuric acid dew point corrosion resistant steel and production method thereof |
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| CN202111134176.2A CN113862570A (en) | 2021-09-27 | 2021-09-27 | High-strength sulfuric acid dew point corrosion resistant steel and production method thereof |
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| CN202111134176.2A Pending CN113862570A (en) | 2021-09-27 | 2021-09-27 | High-strength sulfuric acid dew point corrosion resistant steel and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115011876A (en) * | 2022-05-30 | 2022-09-06 | 鞍钢股份有限公司 | Steel for resisting high-temperature sulfuric acid dew point corrosion and manufacturing method thereof |
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| JP2012180546A (en) * | 2011-02-28 | 2012-09-20 | Nisshin Steel Co Ltd | Sulfuric acid dew point corrosion resistant steel and exhaust gas flow-path constructional element |
| CN109898032A (en) * | 2019-04-30 | 2019-06-18 | 日照钢铁控股集团有限公司 | A kind of yield strength 700MPa grade high-strength weathering steel and its production method |
| JP6806291B1 (en) * | 2019-07-09 | 2021-01-06 | Ｊｆｅスチール株式会社 | Seamless steel pipe with excellent sulfuric acid dew point corrosion resistance and its manufacturing method |
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| JPH11131179A (en) * | 1997-10-24 | 1999-05-18 | Nkk Corp | Steel for welded structure, excellent in sulfuric acid dew point corrosion resistance, and its production |
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| JP2012180546A (en) * | 2011-02-28 | 2012-09-20 | Nisshin Steel Co Ltd | Sulfuric acid dew point corrosion resistant steel and exhaust gas flow-path constructional element |
| CN109898032A (en) * | 2019-04-30 | 2019-06-18 | 日照钢铁控股集团有限公司 | A kind of yield strength 700MPa grade high-strength weathering steel and its production method |
| JP6806291B1 (en) * | 2019-07-09 | 2021-01-06 | Ｊｆｅスチール株式会社 | Seamless steel pipe with excellent sulfuric acid dew point corrosion resistance and its manufacturing method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115011876A (en) * | 2022-05-30 | 2022-09-06 | 鞍钢股份有限公司 | Steel for resisting high-temperature sulfuric acid dew point corrosion and manufacturing method thereof |
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Application publication date: 20211231 |