CN115896470A - Electroslag remelting method for ultra-pure ultra-low-carbon nitrogen-controlled austenitic stainless steel for nuclear power - Google Patents
Electroslag remelting method for ultra-pure ultra-low-carbon nitrogen-controlled austenitic stainless steel for nuclear power Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 41
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 28
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000012298 atmosphere Substances 0.000 claims abstract description 17
- 230000001681 protective effect Effects 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 11
- 229910052786 argon Inorganic materials 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 8
- 229910004709 CaSi Inorganic materials 0.000 claims description 6
- 239000012300 argon atmosphere Substances 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 238000003723 Smelting Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 229910004261 CaF 2 Inorganic materials 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910008455 Si—Ca Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides an electroslag remelting method of ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power, belonging to the technical field of metallurgical manufacturing. The electroslag remelting method of the ultra-pure ultra-low-carbon nitrogen-controlled austenitic stainless steel for nuclear power is characterized by comprising the following steps of: electroslag preparation: adding a deoxidizer into slag for remelting ultra-pure ultra-low-carbon nitrogen-controlled austenitic stainless steel for nuclear power, and uniformly mixing to prepare electroslag; and remelting electroslag under a protective atmosphere to obtain the ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel electroslag ingot. The ultra-high-purity ultra-low-carbon nitrogen-controlled austenitic stainless steel electroslag remelting method for nuclear power has the advantages that the purity of the obtained product is high, and the industrial prospect is good.
Description
Technical Field
The invention relates to an electroslag remelting method of ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power, belonging to the technical field of metallurgical manufacturing.
Background
The components and inclusion standard requirements of the ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel (material: X2CrNiMo18.12 (nitrogen control)) for nuclear power are respectively shown in the table 1 and the table 2.
TABLE 1 chemical composition (wt%)
TABLE 2 inclusions
At present, the steel ingot for the material is generally remelted by electroslag, one or more deoxidizing agents are added in the process of the electroslag remelting, and the deoxidizing agents generate a large amount of deoxidizing products, generate endogenous impurities and pollute molten steel.
CN111139362A discloses a remelting method of high-purity 316LN stainless steel, which comprises the following steps: preparing slag charge: preparing slag charge according to the mass percentage, wherein the mixture ratio of the slag charge is CaF 2 ：40～50％，CaO：20～25％，SiO 2 :20 to 25%, mgO:5 to 10 percent; electroslag remelting: argon is adopted for protection and rapid smelting, the smelting speed is not lower than 0.92D1Kg/h, and D1 is the average diameter of a crystallizer for electroslag remelting; vacuum consumable remelting: controlling the smelting vacuum degree to be 5-10 Pa; sampling and detecting, namely sampling at a position 10cm away from a dead head and an arc end of the consumable ingot to detect the contents of oxygen, nitrogen and aluminum. The method has the following defects: the slag system is completely discarded with Al 2 O 3 Oxides, to some extent, reducing Al 2 O 3 Impurities are included, but the alkalinity is lower, and the capacity of adsorbing the impurities is not ideal.
CN104789787A discloses an electroslag remelting method of high-purity austenitic nitrogen-containing stainless steel for nuclear power, which comprises the following steps: selecting a cylindrical metal electrode for electroslag; processing the metal electrode by a machining method; welding and heating the metal electrode and a stainless steel false electrode for electroslag; selecting CaF 2 50％～60％，Al 2 O 3 15％～25％，CaO 10％～20％，MgO 5％～10％，SiO 2 3 to 6 percent of slag systems are subjected to slagging treatment; carrying out feeding treatment; and performing die cooling. The method has the following defects: although molten steel is purified, the effect of removing inclusions is not ideal enough due to low alkalinity and less CaO, and a composite deoxidizer of Si-Ca powder and Al powder is adopted, so although the oxygen in a steel ingot can be treated to a lower level, the deoxidizer necessarily produces a large amount of CaO-Al 2 O 3 -SiO 2 The composite inclusion pollutes molten steel and reduces the purity of steel ingots.
CN111139393A discloses a smelting method of austenitic stainless steel for 316H nuclear power, which comprises the following steps: primary smelting of molten steel; decarbonizing; primary reduction: adding lime with the addition of 12-15 Kg/T steel and fluorite, carrying out primary reduction for more than or equal to 15 minutes, and sampling to confirm components after breaking empty; deslagging after primary reduction; and (3) secondary reduction: VD is added into the low-melting-point low-alkalinity slag system; pouring; electroslag remelting: removing the peel of the surface of the electrode ingot, cutting off the head and the tail, then carrying out electroslag remelting in protective atmosphere, selecting a low-melting-point high-alkalinity slag system, and annealing heat treatment after the electroslag is finished. Compared with the prior art, the nonmetallic inclusions of the austenitic stainless steel for 316H nuclear power obtained by the method are remarkably improved, but the coarse inclusions and the fine inclusions of the B-grade and the D-grade cannot be eliminated, and the industrial requirement of the austenitic stainless steel needing purer cannot be met.
CN115341101A discloses a control method for producing large-sized austenitic stainless steel electroslag remelting ingot non-metallic inclusions, which comprises the following steps: adopting a protective atmosphere electroslag furnace; preparing before remelting; adding the remelting slag system into a crystallizer; selecting corresponding ternary pre-melted slag with good fluidity according to the alloy melting point to the heavy melted slag system, and realizing good steel slag separation in the electroslag process; and carrying out an electroslag remelting process, and controlling a proper electroslag melting speed to achieve effective slag discharge in a solidification process. Compared with the prior art, the nonmetallic inclusion of the austenitic stainless steel electroslag remelting ingot obtained by the method has obvious progress, but the D-level fine inclusion can not be eliminated, and the industrial requirement of the austenitic stainless steel with high purity can not be met.
Disclosure of Invention
The invention solves the first technical problem of providing an electroslag remelting method of ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power.
The electroslag remelting method of the ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power comprises the following steps:
a. electroslag preparation: adding a deoxidizer into slag for remelting ultra-pure ultra-low-carbon nitrogen-controlled austenitic stainless steel for nuclear power, and uniformly mixing to prepare electroslag; the slag for remelting the nuclear power ultra-pure ultra-low-carbon nitrogen-controlled austenitic stainless steel comprises the following components in parts by weight: caF 2 35 to 45 portions of Al 2 O 3 25 to 35 portions of CaO, 25 to 35 portions of SiO 2 2-5 parts of MgO, 3-5 parts of MgO; wherein, al 2 O 3 The weight ratio of the CaO to the raw material is 1.0-1.2; alkalinity: 10 to 17.5, and the alkalinity is CaO content and SiO 2 The ratio of the contents; wherein the deoxidizer is a mixture of CaSi particles and Ca particles, the addition amount of the CaSi particles is 0.021-0.04% of the weight of the slag charge, and the addition amount of the Ca particles is 0.021-0.04% of the weight of the slag charge0.01 to 0.03 percent of;
b. and (4) remelting electroslag under a protective atmosphere to obtain the ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel electroslag ingot.
Wherein, the weight of the slag charge for remelting the ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power in the step a is 0.05-0.06D 2 kg, wherein D is the average diameter of the remelting mould in cm.
And c, the protective atmosphere in the step b is argon atmosphere, and the furnace atmosphere before the start of electroslag remelting, after electrode exchange in the electroslag remelting process and the electroslag remelting process is protected by 100% argon atmosphere.
Wherein, before the electroslag remelting is started and after the electrode exchange in the electroslag remelting process, the atmosphere in the furnace is replaced by argon, and the flow of the argon is 250-300 m 3 H, until the oxygen concentration of the atmosphere in the furnace is less than or equal to 0.5PPm.
Wherein, when the furnace atmosphere in the electroslag remelting process is protected by 100 percent argon atmosphere, the flow of the argon is 30-50 m 3 H, the oxygen concentration is less than or equal to 0.5PPm.
Wherein, the electrode melting speed in the electroslag remelting process in the step b is 0.80-1.0 Dkg/h, and the D is the average diameter of the crystallizer and has the unit of mm.
The nuclear power ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel obtained by the nuclear power ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel electroslag remelting method has the following non-metallic inclusion analysis results: a coarse system: 0.0, A fine line: 0.0, B crude system: 0.0, B fine line: 0.0, C crude: 0.0, C fine line: 0.0, D crude: 0.0, line D: 0.0.
the invention has the beneficial effects that:
1. the ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel electroslag remelting method for nuclear power provided by the invention has the advantages that the formed surface of the prepared ultra-low carbon nitrogen-controlled austenitic stainless steel ingot is good in forming quality, and the components such as carbon, nitrogen and the like are stable.
2. The electroslag remelting method for the ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power provided by the invention has the advantages that the electroslag remelting degree for the ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power is high, the inclusion content is low, and the electroslag remelting method can reach 0.0 grade of A-type coarse system, 0.0 grade of fine system, 0.0 grade of B-type coarse system, 0.0 grade of fine system, 0.0 grade of C-type coarse system, 0.0 grade of fine system, 0.0 grade of D-type coarse system, 0.5 grade of fine system and 0.5 grade of DS-type.
Detailed Description
Embodiments of the present invention are described in detail below with reference to specific examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples were carried out under conventional conditions without specifying the specific conditions.
Example 1
According to the weight ratio of table 3, respectively mixing the CaF of each group 2 、Al 2 O 3 、CaO、SiO 2 Mixing MgO to obtain slag, adding CaSi grains and Ca grains into the slag, and mixing to obtain electroslag;
TABLE 3
| Numbering | CaF 2 | Al 2 O 3 | CaO | SiO 2 | MgO | Particles of CaSi | Ca particle |
| 1 | 825 | 519 | 481 | 40 | 58 | 0.576 | 0.384 |
| 2 | 780 | 491 | 455 | 38 | 55 | 0.545 | 0.363 |
| 3 | 646 | 546 | 509 | 45 | 73 | 0.550 | 0.370 |
| 4 | 689 | 566 | 510 | 47 | 76 | 0.576 | 0.384 |
| 5 | 865 | 481 | 462 | 38 | 77 | 0.673 | 0.480 |
The method for electroslag remelting of the ultra-pure ultra-low-carbon nitrogen-controlled austenitic stainless steel for nuclear power specifically comprises the following steps:
a. after the electrode is put into the crystallizer, covering a sealed atmosphere protection cover;
b. introducing argon into the crystallizer, and replacing air in the furnace until the oxygen concentration in the furnace is less than or equal to 0.5PPm;
c. the electroslag is adopted for arc striking and slagging;
d. in the electroslag remelting process, continuously keeping introducing argon for atmosphere protection, and maintaining the oxygen concentration above slag in the furnace to be less than or equal to 0.5PPm;
e. in the electroslag process, the melting speed of the electrode is controlled to be 0.80-1.0 Dkg/h, and D is the diameter of the crystallizer and the unit is mm.
f. After electrode exchange, argon is quickly introduced to replace oxygen in the furnace, and the oxygen concentration in the crystallizer is kept below 0.5PPm.
g. After the electroslag ingot was produced, a sample was taken from the ingot and analyzed for chemical components and inclusions, and the results are shown in tables 4 and 5.
TABLE 4 chemical composition (wt%)
| Element(s) | C | Si | Mn | P | S | Cr | Ni | Mo | N |
| Results 1 | 0.025 | 0.55 | 1.61 | 0.018 | 0.002 | 17.62 | 12.02 | 2.48 | 0.076 |
| Results 2 | 0.024 | 0.57 | 1.60 | 0.017 | 0.001 | 17.60 | 12.00 | 2.50 | 0.075 |
| Results 3 | 0.028 | 0.52 | 1.58 | 0.019 | 0.001 | 17.57 | 11.98 | 2.46 | 0.077 |
| Results 4 | 0.029 | 0.50 | 1.70 | 0.018 | 0.002 | 17.45 | 11.96 | 2.47 | 0.076 |
| Results 5 | 0.026 | 0.52 | 1.59 | 0.017 | 0.001 | 17.58 | 12.10 | 2.48 | 0.075 |
| Element(s) | Cu | Ta | Co | B | |||||
| Results 1 | 0.05 | 0.002 | 0.03 | 0.0005 | |||||
| Results 2 | 0.04 | 0.003 | 0.02 | 0.0004 | |||||
| Results 3 | 0.05 | 0.002 | 0.02 | 0.0004 | |||||
| Results 4 | 0.04 | 0.003 | 0.03 | 0.0004 | |||||
| Results 5 | 0.05 | 0.002 | 0.03 | 0.0005 |
TABLE 5 inclusions
| Categories | Coarse A | A is thin | B coarse | B is thin | C coarse | Fine diameter of C | D coarse | D is thin | DS |
| Results 1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 |
| Results 2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Results 3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 |
| Results 4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Results 5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
It can be seen from tables 4 and 5 that the electroslag ingot produced by the method of the present invention has low inclusion content, and the steel ingot is ultra pure.
The present embodiments are to be considered as illustrative and not restrictive, and modifications and improvements on the basis of the present invention may be made by those skilled in the art after reading the present specification without departing from the scope of the invention as defined by the appended claims.
Claims (8)
1. The electroslag remelting method of the ultra-pure ultra-low-carbon nitrogen-controlled austenitic stainless steel for nuclear power is characterized by comprising the following steps of:
a. electroslag preparation: adding a deoxidizer into slag for remelting ultra-pure ultra-low-carbon nitrogen-controlled austenitic stainless steel for nuclear power, and uniformly mixing to prepare electroslag; the slag for remelting the nuclear power ultra-pure ultra-low-carbon nitrogen-controlled austenitic stainless steel comprises the following components in parts by weight: caF 2 35 to 45 portions of Al 2 O 3 25 to 35 portions of CaO, 25 to 35 portions of CaO and SiO 2 2-5 parts of MgO, 3-5 parts of MgO; wherein, al 2 O 3 The weight ratio of the CaO to the raw material is 1.0-1.2; alkalinity: 10 to 17.5, and the alkalinity is CaO content and SiO 2 The ratio of the contents; wherein the deoxidizer is a mixture of CaSi particles and Ca particles, and the CaSi particles are addedThe amount of the Ca particles is 0.021-0.04 percent of the weight of the slag charge, and the addition amount of the Ca particles is 0.01-0.03 percent of the weight of the slag charge;
b. and (4) remelting electroslag under a protective atmosphere to obtain the ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel electroslag ingot.
2. The electroslag remelting method for the nuclear power ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel as claimed in claim 1, wherein in the step a, the weight of the slag for remelting the nuclear power ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel is 0.05-0.06D 2 kg, wherein D is the average diameter of the remelting mould in cm.
3. The electroslag remelting method for the ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power as claimed in claim 1, characterized in that: and b, the protective atmosphere in the step b is argon atmosphere, and the furnace atmosphere before the electroslag remelting is started, in the electroslag remelting process and after the electrode exchange in the electroslag remelting process is protected by 100% argon atmosphere.
4. The electroslag remelting method for the ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power as claimed in claim 3, characterized in that: before the start of electroslag remelting and after electrode exchange in the process of slag remelting, the atmosphere in the furnace is replaced by argon, and the flow of the argon is 250-300 m 3 And h, until the oxygen concentration of the atmosphere in the furnace is less than or equal to 0.5PPm.
5. The electroslag remelting method for the ultra-pure ultra-low carbon and nitrogen-controlled austenitic stainless steel for nuclear power, according to claim 3, is characterized in that: when the furnace atmosphere in the electroslag remelting process is protected by 100 percent argon atmosphere, the flow of the argon is 30-50 m 3 H, the oxygen concentration is less than or equal to 0.5PPm.
6. The electroslag remelting method for the ultra-pure ultra-low carbon and nitrogen-controlled austenitic stainless steel for nuclear power, according to claim 1, is characterized in that: and b, the electrode melting speed in the electroslag remelting process in the step b is 0.80-1.0 Dkg/h, and D is the average diameter of the crystallizer and the unit is mm.
7. The ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power obtained by the electro-slag remelting method of ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power of any one of claims 1 to 6.
8. The ultra-pure ultra-low carbon nitrogen-controlled austenitic stainless steel for nuclear power of claim 7, characterized in that the analysis result of the non-metallic inclusions is as follows: a coarse system: 0.0, A fine line: 0.0, B crude: 0.0, B fine line: 0.0, C crude: 0.0, C fine line: 0.0, D crude: 0.0, line D: 0.0.
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| PCT/CN2023/135809 WO2024140018A1 (en) | 2022-12-27 | 2023-12-01 | Ultrapure ultralow-carbon nitrogen-controlled austenitic stainless steel for nuclear power and electroslag remelting method therefor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024140018A1 (en) * | 2022-12-27 | 2024-07-04 | 二重（德阳）重型装备有限公司 | Ultrapure ultralow-carbon nitrogen-controlled austenitic stainless steel for nuclear power and electroslag remelting method therefor |
| CN118996287A (en) * | 2024-08-19 | 2024-11-22 | 福建洲凯新材料有限公司 | Austenitic stainless steel and preparation method thereof |
| WO2025020393A1 (en) * | 2023-07-21 | 2025-01-30 | 中国科学院金属研究所 | Vacuum consumable remelting smelting method capable of reducing content of oxide inclusions |
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| JPS6061195A (en) * | 1983-08-04 | 1985-04-08 | Kobe Steel Ltd | Flux for electroslag build-up welding |
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| CN115896470B (en) | 2024-09-17 |
| WO2024140018A1 (en) | 2024-07-04 |
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