CN117947331A - Preparation method of super duplex stainless steel plate blank electrode - Google Patents
Preparation method of super duplex stainless steel plate blank electrode Download PDFInfo
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- CN117947331A CN117947331A CN202410262589.6A CN202410262589A CN117947331A CN 117947331 A CN117947331 A CN 117947331A CN 202410262589 A CN202410262589 A CN 202410262589A CN 117947331 A CN117947331 A CN 117947331A
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- stainless steel
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- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000005266 casting Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 13
- 244000035744 Hura crepitans Species 0.000 claims abstract description 9
- 238000007670 refining Methods 0.000 claims abstract description 9
- 238000004512 die casting Methods 0.000 claims abstract description 4
- 229910000885 Dual-phase steel Inorganic materials 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 238000005261 decarburization Methods 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 7
- 239000011651 chromium Substances 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 claims description 4
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 4
- 229910021419 crystalline silicon Inorganic materials 0.000 claims description 4
- 239000010436 fluorite Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 abstract description 9
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 6
- 239000010935 stainless steel Substances 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000003749 cleanliness Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910001309 Ferromolybdenum Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910001114 SAF 2507 Inorganic materials 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- SJKRCWUQJZIWQB-UHFFFAOYSA-N azane;chromium Chemical compound N.[Cr] SJKRCWUQJZIWQB-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000009865 steel metallurgy Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The embodiment of the invention provides a preparation method of a super duplex stainless steel plate blank electrode. The method adopts a process route of medium frequency furnace smelting, AOD furnace refining and sand box die casting. The invention adopts the technological route of intermediate frequency furnace smelting, AOD refining and sand box casting and finally heat treatment through electrode smelting control of the super duplex stainless steel plate blank. Not only meets the requirement of too narrow component range of the consumable electrode part of the dual-phase steel, but also ensures that the material has higher cleanliness and component uniformity, and controls the precipitation of the intermediate phase of the stainless steel.
Description
Technical Field
The application relates to the technical field of stainless steel metallurgy, in particular to a preparation method of a super duplex stainless steel plate blank electrode.
Background
The duplex stainless steel is the stainless steel with the ferrite and the austenite accounting for about 50% of each structure, the excellent toughness and the weldability of the austenitic stainless steel are combined with the higher strength and the chloride stress corrosion resistance of the ferritic stainless steel, the advantages of the two are utilized to rapidly develop from the 90 th century, and the duplex stainless steel has been widely applied at home and abroad at present.
The super duplex stainless steel is based on stainless steel, and has relatively high balance component design to the Cr, mo and N content in the steel while controlling the carbon content in relatively low level. The steel has high stress corrosion resistance, pore corrosion resistance and crevice corrosion resistance.
UNS S32750 is a super duplex stainless steel suitable for ASME standard and has the composition shown in table 1 below.
Table 1 UNS s32750 standard composition (wt%) currently consumable electrode production most use vacuum consumable furnace/electric furnace smelting, LF refining, VD vacuum degassing casting process routes. The route has a more severe equipment requirement, and the production electrode can not flexibly adjust the specification according to the requirement due to vacuum casting, so that the operation is complex.
Disclosure of Invention
The embodiment of the invention provides a preparation method of a super duplex stainless steel plate blank electrode, which comprises the following steps: intermediate frequency furnace smelting, argon oxygen decarburization AOD furnace refining and sand box die casting.
In some embodiments, the intermediate frequency furnace smelting comprises:
Pre-starting the slag charge bedding before smelting, wherein the smelting process is started at 50% power, and sequentially adding pure iron, furnace return materials, tungsten bars, electrolytic nickel, molybdenum bars, metallic chromium and chromium nitride iron;
After slag skimming is finished, new slag is additionally manufactured to prevent P from returning, and the added slag comprises lime and fluorite, so that the fluidity of furnace burden is ensured. In some embodiments, the AOD furnace refining includes:
Oxygen blowing and decarburization are carried out in the oxidation period of the dual-phase steel until the content of N is controlled below 0.02%, the content of Mn and Cr is controlled at the upper limit, and the content of C is controlled by deoxidizing crystalline Si in the reduction period.
In some embodiments, the flask molding includes:
And (3) casting by a bottom pouring method, wherein a sand box is added with a riser to improve a solidification structure, the amount of riser steel water is more than 30% of the casting weight, and the casting is free of center looseness and shrinkage cavity.
In some embodiments, the flask molding further comprises:
The sand box is uniformly provided with air outlet holes so as to reduce the pressure applied to the primary shell.
The electrode prepared by the method provided by the embodiment of the invention has good surface quality, and no obvious air holes are formed on the polished surface after heat treatment. The chemical components are qualified, and the PRE value requirement is met. The interior of the material has no obvious segregation, looseness, shrinkage cavity, obvious bubbles, cracks and the like, and various inclusions meet the requirements.
The electrode raw materials prepared by the method of the embodiment of the invention are scrap steel and various alloys, slag formers and deoxidizers, and compared with the corrosion-resistant alloy with the same level, nitrogen is used for replacing part of nickel, molybdenum and the like, so that the production cost is reduced; meanwhile, in the casting process, the ways of covering slag, low superheat degree and the like are adopted, so that the solid solution effect of nitrogen in molten steel is ensured, and escape is reduced.
Detailed Description
In order to more fully understand the features and technical content of the embodiments of the present application, the implementation of the embodiments of the present application will be described in detail below, which is for reference only, but is not intended to limit the embodiments of the present application.
Besides providing an extra production route, the invention has simple equipment and more flexible casting specification, and reduces the smelting cost of electrode ton steel to 3000 yuan/ton.
The invention provides a preparation method of a super duplex stainless steel plate slab ingot-drawing electrode, wherein the nitrogen content of the electrode is higher than 0.3%, and the pitting corrosion equivalent is higher than 41. The invention comprises two aspects of design of internal control components and smelting process. The invention relates to a dual-phase stainless steel slab ingot stripping electrode, which is smelted by adopting a mode of a 3-ton medium-frequency induction furnace, a 3-ton argon oxygen decarburization (argon oxygen decarburizationfurnace, AOD) furnace and die casting.
The properties of duplex stainless steel are affected by the ratio of the two phases. The most important factor affecting corrosion resistance is the balance ratio of austenite and ferrite.
The influencing factors influencing the phase ratio of the duplex stainless steel include two, namely the composition of the duplex stainless steel, which has a decisive effect on the phase ratio, and the solution temperature of the duplex stainless steel. Therefore, during smelting of the duplex stainless steel, the internal control components must be designed, the ferrite content is ensured to be controlled to be 50%, and the designed internal control components are shown in table 2.
TABLE 2 control composition (wt%) in duplex stainless steel SAF 2507
The carbon content is controlled below 0.02%, which is beneficial to improving corrosion resistance, and the sensitization problem of the steel is negligible due to the low carbon content and the existence of ferrite phase. Si content is too high to be detrimental to the thermoplasticity, and Si as a ferrite forming element can significantly raise the precipitation temperature and precipitation rate of a part of unstable phases, and can promote the phase equilibrium temperature to move toward a lower temperature direction, approaching the precipitation temperature of the precipitated phases, so that the control is required to be at a lower level. Although the Mn content has little influence on precipitation and the like, grain boundary segregation is liable to occur, but a certain Mn content is required to ensure the solubility of N. Cr and N are controlled at the upper limit, so that the corrosion resistance of the material can be ensured, and the maximum harmful phase sigma phase precipitation temperature of the material is the lowest; the Ni element belongs to an austenite forming element, and increases the phase equilibrium temperature of the material, and as Ni increases, the precipitation temperature and precipitation rate of a part of the precipitated phase are greatly reduced, preferably at the middle and lower limits. Mo is controlled at the upper limit, which is favorable for keeping the ferrite content stable and ensuring the corrosion resistance of the material. The N content is controlled at the upper limit, so that the cavitation erosion resistance of the material can be improved, the balance stability of a two-phase structure can be maintained at high temperature, and the stability is of great significance to welding. The internal control component standard of P and S is stricter, and the material performance is ensured. O is controlled at a lower level, which is beneficial to ensuring the cleanliness and inclusion level of the material.
(1) Preparing steelmaking raw materials.
Alloy furnace burden: pure iron, scrap steel, high nitrogen ferrochrome, nickel plates, ferromolybdenum and chromium nitride; slag former and deoxidizer: active lime, fluorite, crystalline silicon and aluminum ingot.
The alloy furnace burden, the slag former and the deoxidizer should be ensured to be clean and free of greasy dirt and the like before smelting, baked and kept clean and dry.
(2) Intermediate frequency induction furnace smelting
To ensure the drying of the neutral furnace lining of the intermediate frequency furnace and to purify the molten steel. Before smelting, active lime and fluorite are put into a furnace to slag (accounting for 1% -1.5% of the total molten steel). Adding scrap steel, ferrochrome, nickel plate and ferromolybdenum. The power of the intermediate frequency furnace is just set to be 50% of the total power at the beginning of the power supply, the duration is about 10 minutes, and the power is gradually adjusted to be maximum after the induction preheating of the furnace body is stable.
After smelting, along with melting of materials in the bottom of the furnace, the materials need to be rammed in time to prevent bridging, and meanwhile pure iron, scrap steel, nickel plates, ferromolybdenum and chromium nitride are added. After furnace burden is melted down, taking molten steel by a quartz tube, performing air cooling solidification to obtain a spectrum sample, performing smelting analysis, if the components are proper, then adjusting the power of an intermediate frequency furnace to about 50%, transferring the molten steel into a ladle baked in advance, and rapidly adding the molten steel into an AOD furnace for refining in order to ensure the temperature of the molten steel.
(3) Refining in AOD furnace
The AOD furnace has the greatest effect of oxygen blowing, decarburization and chromium retention, and can be divided into four stages of oxygen blowing, reduction, component adjustment and tapping. Adding lime and magnesia into the molten steel after adding into a furnace to perform slag formation, then blowing oxygen, performing decarburization, and performing sampling analysis by using the same method when the decarburization degree is less than 0.02% of the required degree; in the reduction stage, in order to ensure that the carbon content is not increased again, reducing by using elemental crystalline silicon, simultaneously blowing argon to stir, and after the reduction is finished, taking a spectrum sample and a gas sample for component analysis; in the component adjustment stage, the component adjustment is carried out,
According to the spectrum result, chromium nitride, electrolytic nickel and the like can be added into the AOD furnace to carry out component fine adjustment to target internal control components; after the component adjustment is finished, a small amount of aluminum ingot (about 20 Kg) is added for Wen Zhenjing to ensure the casting temperature (1550+/-10 ℃) after the protection of the covering agent is added to the surface of the molten steel, and casting is carried out after about 3 minutes.
(4) Electrode treatment
During the cooling process of the sand box, the cast electrode can generate metal intermediate phases and inclusions such as carbide, nitride and the like, and the precipitation of the metal intermediate phases and the inclusions can adversely affect the plasticity, toughness and corrosion resistance of the electrode. In order to ensure the subsequent processing and grinding of the electrode, the electrode needs to be subjected to solution heat treatment. The solid solution temperature was set to 1120 (+ -20) deg.C, and water-cooled.
The technical schemes described in the embodiments of the present application may be arbitrarily combined without any collision.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. A method for preparing a super duplex stainless steel plate blank electrode, which is characterized by comprising the following steps: intermediate frequency furnace smelting, argon oxygen decarburization AOD furnace refining and sand box die casting.
2. The method for preparing the super duplex stainless steel slab electrode according to claim 1, wherein the intermediate frequency furnace smelting comprises:
Pre-starting the slag charge bedding before smelting, wherein the smelting process is started at 50% power, and sequentially adding pure iron, furnace return materials, tungsten bars, electrolytic nickel, molybdenum bars, metallic chromium and chromium nitride iron;
after slag skimming is finished, new slag is additionally manufactured to prevent P from returning, and the added slag comprises lime and fluorite, so that the fluidity of furnace burden is ensured.
3. The method for preparing a super duplex stainless steel slab electrode according to claim 1, wherein the AOD furnace refining comprises:
Oxygen blowing and decarburization are carried out in the oxidation period of the dual-phase steel until the content of N is controlled below 0.02%, the content of Mn and Cr is controlled at the upper limit, and the content of C is controlled by deoxidizing crystalline Si in the reduction period.
4. The method of preparing a super duplex stainless steel slab electrode according to claim 1, wherein the flask molding comprises:
And (3) casting by a bottom pouring method, wherein a sand box is added with a riser to improve a solidification structure, the amount of riser steel water is more than 30% of the casting weight, and the casting is free of center looseness and shrinkage cavity.
5. The method of preparing a super duplex stainless steel slab electrode according to claim 4, wherein the flask molding further comprises:
The sand box is uniformly provided with air outlet holes so as to reduce the pressure applied to the primary shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410262589.6A CN117947331A (en) | 2024-03-07 | 2024-03-07 | Preparation method of super duplex stainless steel plate blank electrode |
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| CN202410262589.6A CN117947331A (en) | 2024-03-07 | 2024-03-07 | Preparation method of super duplex stainless steel plate blank electrode |
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| CN117947331A true CN117947331A (en) | 2024-04-30 |
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