CN115354212A - Smelting method for controlling large-size inclusion in Cr-Mn-Ni high-nitrogen austenitic stainless steel - Google Patents
Smelting method for controlling large-size inclusion in Cr-Mn-Ni high-nitrogen austenitic stainless steel Download PDFInfo
- Publication number
- CN115354212A CN115354212A CN202211000785.3A CN202211000785A CN115354212A CN 115354212 A CN115354212 A CN 115354212A CN 202211000785 A CN202211000785 A CN 202211000785A CN 115354212 A CN115354212 A CN 115354212A
- Authority
- CN
- China
- Prior art keywords
- smelting
- percent
- furnace
- nitrogen
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5241—Manufacture of steel in electric furnaces in an inductively heated furnace
-
- 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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/54—Processes yielding slags of special composition
-
- 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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/18—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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a smelting method for controlling large-size impurities in Cr-Mn-Ni high-nitrogen austenitic stainless steel, which adopts a process route of 'smelting in an induction furnace, smelting in an argon-oxygen furnace, casting an electrode blank and electroslag remelting' to produce, wherein raw materials are carefully selected during smelting in the induction furnace, and lime with the molten steel amount of 1-4% is added into the furnace before the raw materials are added; blowing oxygen for decarburization when smelting in an argon-oxygen furnace until the carbon content is not more than 0.02%, then blowing nitrogen for stirring, adding ferrosilicon into the furnace for reduction, controlling the alkalinity of furnace slag to be 1.5-2.5 in the reduction period, adding alloy and adjusting components to meet the requirements for tapping; adding steel into a steel ladle, blowing nitrogen from the bottom, and simultaneously feeding a calcium silicon wire into the steel ladle; pouring the suspension ladle into an electrode blank, cutting a dead head after demoulding, and air cooling; the false electrode is welded at the top end of the electrode blank, and then electroslag is controlled by atmosphere protection, slag system optimization, power supply system and circulating water temperature. The smelting process in the embodiment is adopted for electroslag, so that large-size inclusions in the Cr-Mn-Ni high-nitrogen austenitic stainless steel can be effectively controlled.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a smelting method for controlling large-size inclusions in Cr-Mn-Ni high-nitrogen austenitic stainless steel.
Background
Nitrogen is used as a cheap and environment-friendly element to be added into stainless steel, so that the mechanical property, corrosion property and other properties of the stainless steel can be obviously improved. Austenitic stainless steels with nitrogen contents exceeding 0.40% are often referred to by metallurgists as high nitrogen steels. The Cr-Mn-Ni high-nitrogen austenitic stainless steel not only has high strength, high toughness and high wear resistance, but also has excellent corrosion resistance and non-magnetism, so that the Cr-Mn-Ni high-nitrogen austenitic stainless steel becomes a preferred material for petroleum drill collars and non-magnetism centralizers. Compared with common steel materials, the smelting technology of the non-magnetic material is advanced and the price is high.
With the development of petroleum exploration and development towards high depth and complex stratum, and the application of drilling technologies such as ultra-deep wells, highly deviated wells, extended reach wells and the like, drilling tool products are used under the conditions of complex environment and severe environment such as low temperature, corrosion, high pressure and the like in the pit, and are difficult to transport, assemble and disassemble, so that the materials of the drilling tool products are required to have excellent mechanical properties and high quality stability so as to ensure the service life of the drilling tool products.
Through research, the corrosion resistance, the mechanical property and the service life of the material are obviously influenced by the nonmetallic inclusion in the steel, and the large-size nonmetallic inclusion is one of the main factors causing corrosion cracking in the using process of the product. The Cr-Mn-Ni high-nitrogen austenitic stainless steel material is important in the production process for reasonably controlling large-size non-metallic inclusions in the steel in order to obtain high-quality and high-reliability comprehensive performance.
Disclosure of Invention
The object of the present invention is to solve the problems described in the background art and to provide a method for controlling large-size inclusions in Cr-Mn-Ni high-nitrogen austenitic stainless steel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a smelting method for controlling large-size inclusions in Cr-Mn-Ni high-nitrogen austenitic stainless steel is produced by adopting a process route of 'induction furnace smelting + argon oxygen furnace smelting + die casting electrode blank + electroslag remelting', and comprises the following specific smelting steps:
step 1), selecting raw materials of low-phosphorus steel during smelting in an induction furnace, returning to a stub bar at 400-600 kg/t, ferrochromium at 200-300 kg/t, ferromolybdenum at 5-10 kg/t and nickel plates at 20-30 kg/t, and adding lime accounting for 1-4% of the planned amount of molten steel into the furnace before feeding;
step 2), oxidizing smelting and then reducing smelting during smelting in an argon-oxygen furnace, blowing oxygen for decarburization in an oxidation period until the carbon content is lower than 0.02%, adding fluorite of 5-10 kg/t and lime of 30-50 kg/t for slagging in a reduction period, controlling the alkalinity of furnace slag of 1.5-2.5, electrolyzing manganese of 200-300 kg/t for adjusting the manganese content, adding ferrosilicon of 30-50 kg/t and aluminum ingot of 7-10 kg/t for oxygen blowing, heating and reducing, supplementing alloy fine adjustment components according to sampling chemical analysis results and process target components, blowing nitrogen and supplementing nitralloy of 20-40 kg/t for adjusting the nitrogen content, wherein the components meet the requirements of tapping;
step 3), steel is added into a steel ladle, nitrogen is blown at the bottom for 100-300 m/h, the total weak stirring time of the molten steel in the steel ladle is controlled to be 7-11 min, a special wire feeding device is adopted to feed a calcium silicon wire into the steel ladle for 3-5 min, the specification phi 8 to phi 16mm of the calcium silicon wire is controlled to be 40-100 m/min;
step 4), casting the electrode blank by a crane ladle, cutting a riser along a riser line after demoulding, and performing electroslag conversion after air cooling;
step 5), polishing the surface of the electrode blank by adopting a grinding wheel machine, clearing away floating slag, floating dust and floating rust by using visible light, welding a false electrode, and remelting electroslag;
and 6) carrying out electroslag ingot inspection, and carrying out down-turning forging.
The chemical composition requirements of the product are as follows: less than or equal to 0.05 percent of C, less than or equal to 1.00 percent of Si, 16.00-22.00 percent of Mn, less than or equal to 4.00 percent of Ni, 16.50-20.00 percent of Cr, less than or equal to 2.20 percent of Mo, less than or equal to 0.015 percent of S, less than or equal to 0.035 percent of P, 0.45-0.60 percent of N and the balance of iron, and the partial alloying elements are internally controlled in the smelting process: 0.40 to 0.60 percent of Si and less than or equal to 0.010 percent of Al.
The false electrode must be welded at the top end of electrode blank during electroslag remelting, and the electroslag process adopts nitrogen protection with 30-10 Nm of nitrogen flow 3 The slag system used for electroslag remelting is 60% -CaF 2 +20%-Al 2 O 3 +20% -CaO pre-melted slag.
The electroslag remelting process adopts a 'high-voltage low-current' power supply system, and the highest secondary voltage (unit: V) is preferably k of the diameter (unit: mm) of the crystallizer 1 Multiple (coefficient k) 1 0.09-0.12 is taken, a large value is taken for a small ingot, a small value is taken for a large ingot, and the highest current (unit: a) Preferably the diameter of the crystallizer (unit: mm) of k 2 Multiple (coefficient k) 2 Taking 20-25, small ingot and large ingot), controlling the current fluctuation range to +/-30-50%, and controlling the temperature difference between the circulating water inlet and outlet of the crystallizer to be 30-55 ℃.
The technical scheme of the invention has the following positive effects:
according to the smelting method for controlling the large-size impurities in the Cr-Mn-Ni high-nitrogen austenitic stainless steel, 0.40% -0.60% of Si is controlled, a certain amount of Si exists in the steel to ensure good deoxidation, and the aim of controlling the lower aluminum-based non-metallic impurities in the steel is achieved by controlling Al to be less than or equal to 0.010%.
A certain amount of lime is added before the smelting of the induction furnace, so that high-alkalinity furnace slag is formed conveniently in the initial smelting period, the erosion of the furnace bottom and the furnace lining is reduced, and foreign impurities are prevented from being brought into steel.
The silicon-calcium wire is fed into the steel ladle and has two functions: on the one hand, the molten steel is further deoxidized, and free oxygen and unstable oxides in the steel are removed. On the other hand, the aluminum-based inclusions in the steel are modified to generate easily deformable silicate inclusions, thereby achieving the purpose of controlling the size and the quantity of the non-metallic inclusions in the electrode blank.
The false electrode is welded at the end of the electrode blank riser for electroslag, the electrode blank riser is upward, so that gas and impurities at the end of the electrode blank riser are prevented from entering a slag pool and a metal molten pool to pollute slag liquid and molten steel, and the electrode blank and an electroslag ingot are in V-shaped segregation, thereby being beneficial to removing the impurities and the gas in the electroslag process.
The nitrogen protection in the electroslag process is beneficial to forming inert atmosphere above the slag surface in the electroslag process, so that the oxidation reaction of the electrode blank skin above the slag surface and oxygen molecules in the atmosphere is inhibited, and the generated oxides are prevented from entering steel through slag liquid to form non-metallic inclusions.
The electroslag system adopts 60% -CaF 2 +20%-Al 2 O 3 The 20% -CaO pre-melted slag is full, the high-alkalinity pre-melted slag can be beneficial to reducing hydrogen increase and oxygen increase in the electroslag process, and the inclusions with super-large diameters are easier to be absorbed and removed by the melted slag.
The electroslag adopts a high-voltage low-current power supply system, the current fluctuation range is controlled to be +/-30% -50%, smaller molten drops can be obtained at the end part of an electrode blank, the contact specific surface area of the metal molten drops and slag liquid is larger, and the removal of non-metallic inclusions in the molten steel melting stage is promoted.
The high-voltage low-current power supply system is adopted, the temperature difference between the circulating water inlet and the circulating water outlet of the crystallizer is controlled to be 30-50 ℃, the solidification speed in the electroslag process is slow, and a metal molten pool in the crystallizer is relatively deep, so that the floating of non-metal inclusions in steel is facilitated.
Detailed Description
Example 1: a smelting method for controlling large-size inclusions in Cr-Mn-Ni high-nitrogen austenitic stainless steel adopts a process route of '5 t induction furnace smelting +8t argon oxygen furnace smelting + die casting electrode blank +3t furnace electroslag remelting' to produce ZYNM7, and the components in the product technical standard have requirements: less than or equal to 0.05 percent of C, less than or equal to 1.00 percent of Si, 16.00-22.00 percent of Mn, less than or equal to 4.00 percent of Ni, 16.50-20.00 percent of Cr, less than or equal to 2.20 percent of Mo, less than or equal to 0.015 percent of S, less than or equal to 0.035 percent of P, 0.45-0.60 percent of N, and the balance of iron. Internal control is carried out on partial alloying elements: 0.40 to 0.60 percent of Si and less than or equal to 0.010 percent of Al.
The specific smelting steps are as follows:
step 1), smelting raw materials in an induction furnace, wherein P is less than or equal to 0.010 percent, the raw materials are returned to a stub bar for 4.5t, ferrochrome for 1.8t, ferromolybdenum for 50kg and a nickel plate for 200kg, and lime for 100kg is added into the induction furnace before the raw materials are added;
step 2), oxidizing smelting and then reducing smelting are carried out during smelting in an argon-oxygen furnace, oxygen blowing and decarburization are carried out to 0.016% in the oxidation period, fluorite 50kg and lime 300kg are added for slagging in the reduction period, the alkalinity of furnace slag is controlled to be 2.0, electrolytic manganese is added for 2000kg to adjust the manganese content, 350kg of ferrosilicon and 70kg of aluminum ingot are added into the furnace for oxygen blowing, heating and reduction, alloy fine adjustment components are added according to the sampling chemical analysis result and the process target components, 200kg of nitrided alloy is added to adjust the nitrogen content, and the components meet the requirements for tapping;
step 3), carrying out steel mixing in a steel ladle, carrying out bottom blowing nitrogen flow rate 230 m/h, feeding 10kg of calcium silicon wire with the specification phi 13mm into the steel ladle by adopting special wire feeding equipment, and carrying out wire feeding at the speed of 50m/min;
step 4), pouring a ladle into a phi 420mm and 3200mm specification electrode blank, cutting a riser along a riser line after demolding, and air cooling;
step 5), the surface of the electrode blank is polished by a grinding wheel machine to clean scum, floating dust, floating rust and the like, a false electrode is welded at the opening end of the electrode blank, and then an electroslag remelting electroslag system in a phi 580/620mm crystallizer adopts 60% -CaF 2 +20%-Al 2 O 3 +20% -CaO pre-melting slag, adopting nitrogen protection in electroslag process, and nitrogen flow rate being 20Nm 3 And h, adopting a high-voltage low-current power supply system, controlling the highest secondary voltage of 66V, the highest current of 12500A, the current fluctuation range to be +/-30 percent to +/-50 percent, and controlling the temperature difference between inlet water and outlet water of circulating water of the crystallizer to be 32-47 ℃.
And 6) carrying out electroslag ingot inspection, and carrying out down-turning forging.
Two groups of smelting are respectively carried out by adopting a conventional process smelting method and the smelting method according to the embodiment, each group produces 3 electroslag ingots, samples are taken from two ends of a tail cap after the electroslag ingots are forged to detect nonmetallic inclusions, and the statistical results of the detection of the nonmetallic inclusions of the high-nitrogen austenitic stainless steel products produced by adopting the conventional smelting method and the smelting method of the embodiment are shown in 1:
TABLE 1 non-metallic inclusions
| Classification | Number of samples | Number of specimens having large-sized nonmetallic inclusions | Average diameter of large-sized nonmetallic inclusion |
| Conventional methods | 30 pieces of | 8 are provided with | 18.75μm |
| This example | 30 pieces of | 1 is provided with | 15μm |
As can be seen from Table 1: in 30 samples of the product produced by the conventional process, 8 large-size nonmetallic inclusions exist, the percentage is 26.67%, and the average diameter of the large-size nonmetallic inclusions is 18.75 mu m. In 30 samples of the product produced by the smelting method in the embodiment, only 2 large-size nonmetallic inclusions exist, the proportion is 6.67%, and the average diameter of the large-size nonmetallic inclusions is 15 mu m.
In the Cr-Mn-Ni high-nitrogen austenitic stainless steel of the embodiment, the large-size nonmetallic inclusion accounts for 20 percent of that of the conventional process, and the average diameter of the large-size nonmetallic inclusion is reduced by 3.75 mu m of that of the conventional process. The method has obvious effect on controlling the number and the diameter of large-size inclusions in the Cr-Mn-Ni high-nitrogen austenitic stainless steel, and provides a basic guarantee for improving the product performance.
Claims (4)
1. A smelting method for controlling large-size inclusions in Cr-Mn-Ni high-nitrogen austenitic stainless steel is characterized by adopting a process route of induction furnace smelting, argon oxygen furnace smelting, die casting electrode blank and electroslag remelting to produce the Cr-Mn-Ni high-nitrogen austenitic stainless steel, and comprising the following specific smelting steps of:
step 1), selecting raw materials of low-phosphorus steel during smelting in an induction furnace, returning to a stub bar at 400-600 kg/t, ferrochromium at 200-300 kg/t, ferromolybdenum at 5-10 kg/t and nickel plates at 20-30 kg/t, and adding lime accounting for 1-4% of the planned amount of molten steel into the furnace before feeding;
step 2), oxidizing smelting and then reducing smelting are carried out during smelting in an argon-oxygen furnace, oxygen blowing and decarburization are carried out in the oxidation period until the carbon content is lower than 0.02%, fluorite is added in the reduction period to be 5-10 kg/t, lime is added in the reduction period to carry out slagging, the alkalinity of furnace slag is controlled to be 1.5-2.5, electrolytic manganese is added to be 200-300 kg/t to adjust the manganese content, ferrosilicon is added in the furnace to be 30-50 kg/t, aluminum ingot is added in the furnace to carry out oxygen blowing, heating and reduction, alloy fine adjustment components are added according to the sampling chemical analysis result and process target components, nitrogen is blown and nitrided alloy is added in the amount of 20-40 kg/t to adjust the nitrogen content, and the components meet the requirement of tapping;
step 3), steel is added into a steel ladle, nitrogen is blown at the bottom for 100-300 m/h, the total weak stirring time of the molten steel in the steel ladle is controlled to be 7-11 min, a special wire feeding device is adopted to feed a calcium silicon wire into the steel ladle for 3-5 min, the specification phi 8 to phi 16mm of the calcium silicon wire is controlled to be 40-100 m/min;
step 4), pouring the suspension ladle into an electrode blank, cutting off a riser along a riser line after demoulding, and performing electroslag conversion after air cooling;
step 5), polishing the surface of the electrode blank by adopting a grinding wheel machine, clearing away floating slag, floating dust and floating rust by using visible light, welding a false electrode, and remelting electroslag;
and 6) carrying out electroslag ingot inspection, and carrying out down-turning forging.
2. The smelting method for controlling large-size inclusions in Cr-Mn-Ni high-nitrogen austenitic stainless steel according to claim 1, characterized by comprising the following steps: the chemical composition requirements of the product are as follows: less than or equal to 0.05 percent of C, less than or equal to 1.00 percent of Si, 16.00-22.00 percent of Mn, less than or equal to 4.00 percent of Ni, 16.50-20.00 percent of Cr, less than or equal to 2.20 percent of Mo, less than or equal to 0.015 percent of S, less than or equal to 0.035 percent of P, 0.45-0.60 percent of N, and the balance of iron, wherein the partial alloying elements are internally controlled in the smelting process: 0.40 to 0.60 percent of Si and less than or equal to 0.010 percent of Al.
3. The smelting method for controlling large-size inclusions in Cr-Mn-Ni high-nitrogen austenitic stainless steel as claimed in claim 1 or 2, characterized in that: in the step 5), the false electrode must be welded at the top end of the electrode blank during electroslag remelting, and the electroslag process adopts nitrogen protection with the nitrogen flow of 30-10 Nm 3 The slag system used for electroslag remelting is 60% -CaF 2 +20%-Al 2 O 3 +20% -CaO pre-melted slag.
4. The smelting method for controlling large-size inclusions in Cr-Mn-Ni high-nitrogen austenitic stainless steel according to claim 3, characterized in that: in the step 5), the electroslag remelting process adopts a 'high-voltage low-current' power supply system, and the maximum secondary voltage (unit: v) is preferably the crystallizer diameter (unit: mm) of k 1 Multiple (coefficient k) 1 0.09-0.12 is taken, the small ingot is taken as the large value, the large ingot is taken as the small value, the highest current (unit: a) Preferably the diameter of the crystallizer (unit: mm) of k 2 Multiple (coefficient k) 2 20 to 25 percent of the total current, small ingot, large ingot and the like), controlling the current fluctuation range to +/-30 percent to +/-50 percent, the temperature difference between the inlet and outlet water of the circulating water of the crystallizer is controlled to be 30-55 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211000785.3A CN115354212B (en) | 2022-08-19 | 2022-08-19 | Smelting method for controlling large-size inclusion in Cr-Mn-Ni high-nitrogen austenitic stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211000785.3A CN115354212B (en) | 2022-08-19 | 2022-08-19 | Smelting method for controlling large-size inclusion in Cr-Mn-Ni high-nitrogen austenitic stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115354212A true CN115354212A (en) | 2022-11-18 |
| CN115354212B CN115354212B (en) | 2023-09-01 |
Family
ID=84003630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211000785.3A Active CN115354212B (en) | 2022-08-19 | 2022-08-19 | Smelting method for controlling large-size inclusion in Cr-Mn-Ni high-nitrogen austenitic stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115354212B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117660849A (en) * | 2024-01-31 | 2024-03-08 | 成都先进金属材料产业技术研究院股份有限公司 | Phosphorus-controlled 00Cr21Ni13Mn5N high-nitrogen austenitic stainless steel and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597721A (en) * | 2009-07-08 | 2009-12-09 | 中原特钢股份有限公司 | Steel for non-magnetic drilling tool and production method thereof |
| CN108866425A (en) * | 2018-07-24 | 2018-11-23 | 河南中原特钢装备制造有限公司 | Use the metallurgy and foundry technique of Ar-O_2 furnace smelting high-nitrogen magnetism-free stainless steel |
-
2022
- 2022-08-19 CN CN202211000785.3A patent/CN115354212B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597721A (en) * | 2009-07-08 | 2009-12-09 | 中原特钢股份有限公司 | Steel for non-magnetic drilling tool and production method thereof |
| CN108866425A (en) * | 2018-07-24 | 2018-11-23 | 河南中原特钢装备制造有限公司 | Use the metallurgy and foundry technique of Ar-O_2 furnace smelting high-nitrogen magnetism-free stainless steel |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117660849A (en) * | 2024-01-31 | 2024-03-08 | 成都先进金属材料产业技术研究院股份有限公司 | Phosphorus-controlled 00Cr21Ni13Mn5N high-nitrogen austenitic stainless steel and production method thereof |
| CN117660849B (en) * | 2024-01-31 | 2024-06-04 | 成都先进金属材料产业技术研究院股份有限公司 | Phosphorus-controlled 00Cr21Ni13Mn5N high-nitrogen austenitic stainless steel and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115354212B (en) | 2023-09-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101397628B (en) | Continuous casting bearing steel round steel and method for producing the same | |
| CN102816979B (en) | Production method of low-carbon sulfur series free-cutting steel continuous casting billet | |
| CN102021488B (en) | Steel for nuclear-island seamless steel tube and production method thereof | |
| CN101607306B (en) | Electroslag smelting casting method of fixed blades of water turbine | |
| CN104532102A (en) | Novel manufacturing technology of large-sized carburized bearing steel G20Cr2Ni4A for wind electricity | |
| CN108950432B (en) | Manufacturing method of high-strength and high-toughness low-alloy wear-resistant steel | |
| CN112981128B (en) | Smelting method of electrode bar base material for non-protective atmosphere electroslag remelting H13 steel | |
| CN114480974B (en) | Production method of high-strength fatigue-resistant sucker rod steel | |
| CN101450376A (en) | Turbine wicket gate double-refining casting technique | |
| CN114293101B (en) | Economical high-grade welding wire steel H04E and preparation method thereof | |
| CN113046638B (en) | SNS acid-resistant steel high-quality casting blank for gas pipeline and production method thereof | |
| CN114941101B (en) | Steel for bearing shaft of automobile engine and production method thereof | |
| CN115354212B (en) | Smelting method for controlling large-size inclusion in Cr-Mn-Ni high-nitrogen austenitic stainless steel | |
| CN111118409A (en) | Low-carbon martensitic stainless steel for valve box and smelting method thereof | |
| CN110541115A (en) | Method for manufacturing austenitic stainless steel 150 short-specification continuous casting round pipe blank | |
| CN114480987A (en) | Rare earth-containing NM600 wear-resistant steel plate and preparation method thereof | |
| CN103114248B (en) | Steel for drilling tools and method for smelting steel for drilling tools | |
| CN113528976A (en) | Non-quenched and tempered bar without surface cracks and preparation method thereof | |
| CN109852881B (en) | Steel for 45CrNiMoVA drill tool and production method thereof | |
| CN111101070A (en) | Steel for low-temperature liquid container tank car and preparation method thereof | |
| CN115058645A (en) | Continuous casting round billet for wind power large-wall-thickness low-cost low-temperature-resistant tower cylinder flange and manufacturing method thereof | |
| CN113186445A (en) | Method for controlling inclusion content of stainless steel product | |
| CN116083757B (en) | Crust breaking hammer and preparation method thereof | |
| CN114959183B (en) | Refining slag system based on aluminum deoxidized Cr5 supporting roller steel and application process thereof | |
| CN114807759B (en) | New energy automobile gear box bearing steel material and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |