CN115354212B - 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
- CN115354212B CN115354212B CN202211000785.3A CN202211000785A CN115354212B CN 115354212 B CN115354212 B CN 115354212B CN 202211000785 A CN202211000785 A CN 202211000785A CN 115354212 B CN115354212 B CN 115354212B
- Authority
- CN
- China
- Prior art keywords
- smelting
- nitrogen
- electroslag
- percent
- 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.)
- Active
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 inclusion in Cr-Mn-Ni high-nitrogen austenitic stainless steel, which adopts a process route of 'induction furnace smelting + argon-oxygen furnace smelting + die casting electrode blank + electroslag remelting' for production, raw materials are carefully selected during the induction furnace smelting, and lime with the amount of 1% -4% of molten steel is added into the furnace before the raw materials are added; when the argon-oxygen furnace is used for smelting, oxygen is firstly blown for decarburization until the carbon content is not more than 0.02%, then nitrogen is blown for stirring, ferrosilicon is added into the furnace for reduction, the alkalinity of slag is controlled to be 1.5-2.5 in the reduction period, and the alloy composition meets the requirement for tapping; adding steel into a ladle, blowing nitrogen at bottom, and feeding a silicon-calcium wire into the ladle; hanging the bag, casting into an electrode blank, demoulding, cutting a riser, and air-cooling; the dummy electrode is welded at the riser end of the electrode blank, and then electroslag is controlled by atmosphere protection, slag system optimization, power supply system and circulating water temperature. The electroslag is carried out by adopting the smelting process in the embodiment, so that large-size inclusions in 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 added into stainless steel as an element which is cheap and environment-friendly, and can obviously improve the mechanical property, corrosion property and other properties. Metallurgical workers commonly refer to austenitic stainless steels having nitrogen contents exceeding 0.40% as high nitrogen steels. The Cr-Mn-Ni high-nitrogen austenitic stainless steel has high strength, high toughness, high wear resistance, excellent corrosion resistance and no magnetism, and is the preferred material for petroleum drill collars and nonmagnetic centralizers. Compared with the common steel material, the non-magnetic material has advanced smelting technology and high price.
With the development of petroleum exploration and development towards high depth and complex stratum, drilling technology such as ultra-deep wells, high-inclination wells, large-displacement wells and the like is applied, drilling tool products are used under conditions of complex environments such as underground low temperature, corrosion, high pressure and the like, and the drilling tool products are difficult to transport, assemble and disassemble, so that the materials are required to have excellent mechanical properties and high quality stability so as to ensure the service life of the drilling tool products.
Through researches, nonmetallic inclusion in steel has obvious influence on corrosion resistance, mechanical property and service life of materials, and large-size nonmetallic inclusion is one of main factors causing corrosion cracking in the use process of products. The high-quality and high-reliability comprehensive performance of the Cr-Mn-Ni high-nitrogen austenitic stainless steel material is that how to reasonably control large-size nonmetallic inclusions in the steel is the important weight in the production process.
Disclosure of Invention
The invention aims to solve the problems in the background art and provides a smelting method for controlling large-size inclusions in Cr-Mn-Ni high-nitrogen austenitic stainless steel.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a smelting method for controlling large-size inclusion in Cr-Mn-Ni high-nitrogen austenitic stainless steel adopts a process route of induction furnace smelting, argon-oxygen furnace smelting, die casting electrode blank and electroslag remelting for production, and the specific smelting steps are as follows:
step 1), during induction furnace smelting, raw materials are carefully selected, low-phosphorus steel seeds are returned to a feed head by 400-600 kg/t, ferrochrome by 200-300 kg/t, ferromolybdenum by 5-10 kg/t and nickel plates by 20-30 kg/t, and lime with the planned amount of molten steel of 1% -4% is added into the furnace before feeding;
step 2), firstly oxidizing smelting and then reducing smelting during smelting in an argon-oxygen furnace, blowing oxygen and decarbonizing in an oxidation period until the carbon content is lower than 0.02%, adding fluorite 5-10 kg/t and lime 30-50 kg/t in a reduction period for slagging, controlling the alkalinity of slag to be 1.5-2.5, adding electrolytic manganese to be 200-300 kg/t for adjusting the manganese content, adding ferrosilicon to be 30-50 kg/t and aluminum ingot to be 7-10 kg/t for oxygen blowing, heating and reducing, and supplementing alloy fine-tuning components according to a sampling chemical analysis result and process target components, blowing nitrogen and supplementing nitrogen alloy to be 20-40 kg/t for adjusting the nitrogen content, wherein the components meet the requirement of tapping;
step 3), adding steel into a steel ladle, blowing nitrogen at the bottom of 100-300 m/h, controlling the total weak stirring time of molten steel in the steel ladle to be 7-11 min, and feeding a calcium silicate wire into the steel ladle by using special wire feeding equipment at the time of weak stirring for 3-5 min at the speed of 40-100 m/min, wherein the wire feeding speed is controlled between 0.8-1.5 kg/t of the calcium silicate wire with the specification phi 8-phi 16 mm;
step 4), pouring the suspension package into an electrode blank, demoulding, cutting a riser along a riser line, and transferring to an electroslag procedure after air cooling;
step 5), polishing the surface of the electrode blank by using a grinder to clean scum, floating dust and floating rust by using visible light, welding a false electrode, and remelting electroslag;
step 6), electroslag ingot inspection and down-turning forging.
The chemical composition of the product requires: less than or equal to 0.05 percent of C, less than or equal to 1.00 percent of Si, 16.00 to 22.00 percent of Mn, less than or equal to 4.00 percent of Ni, 16.50 to 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 to 0.60 percent of N, and the balance of iron, wherein the smelting process carries out internal control on part of alloy elements: si 0.40-0.60% and Al less than or equal to 0.010%.
During electroslag remelting, the false electrode must be welded at the electrode blank riser end, and the electroslag process adopts nitrogen gas for protectionProtecting, nitrogen flow rate is 30-10 Nm 3 And/h, the slag system used for electroslag remelting is 60% -CaF 2 +20%-Al 2 O 3 +20% -CaO full premelting 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 Taking 0.09-0.12, taking a large value from a small ingot, taking a small value from a large ingot), and the highest current (unit: a) Preferably the crystallizer diameter (unit: mm) k 2 Multiple (coefficient k) 2 Taking 20-25, taking small value from small ingot and taking large value from large ingot), controlling the fluctuation range of current to +/-30% - +/-50%, and controlling the temperature difference of the circulating water 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 large-size inclusions in Cr-Mn-Ni high-nitrogen austenitic stainless steel, si is controlled to be 0.40% -0.60%, a certain amount of Si exists in the steel to ensure good deoxidization, and the lower aluminum-based nonmetallic inclusions in the steel are controlled by controlling Al to be less than or equal to 0.010%.
And a certain amount of lime is added before smelting in the induction furnace, so that high-alkalinity slag is formed in the initial stage of smelting, and meanwhile, erosion of the furnace bottom and the furnace lining is reduced, and foreign impurities are prevented from being brought into steel.
Feeding a silicon-calcium wire into the ladle, wherein the silicon-calcium wire plays two roles: on the one hand, the molten steel is further deoxidized, and free oxygen and unstable oxide in the steel are removed. On the other hand, aluminum-based inclusions in the steel are modified to generate easily deformed silicate inclusions, so that the purposes of controlling the size and the quantity of nonmetallic inclusions in an electrode blank are achieved.
The false electrode is welded at the electroslag at the electrode blank riser, the electrode blank riser faces upwards, gas and impurities at 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 the electroslag ingot are both in V-shaped segregation, so that the removal of the impurities and the gas in the electroslag process is facilitated.
The nitrogen protection in the electroslag process is beneficial to forming inert atmosphere above the slag surface in the electroslag process, thereby inhibiting the oxidation reaction of the electrode blank surface above the slag surface and oxygen molecules in the atmosphere, and avoiding the generated oxide from entering steel through slag liquid to form nonmetallic inclusion.
The electroslag system adopts 60% -CaF 2 +20%-Al 2 O 3 +20% -CaO full premelting slag, the high alkalinity premelting slag can be favorable for reducing hydrogen increase and oxygen increase in the electroslag process, and the oversized-diameter inclusions are easier to be adsorbed and removed by slag.
The electroslag adopts a high-voltage low-current power supply system, the current fluctuation range is controlled to +/-30% - +/-50%, smaller molten drops are obtained at the end part of the electrode blank, the contact specific surface area of the metal molten drops and slag liquid is larger, and the removal of nonmetallic inclusion 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 outlet of the crystallizer is controlled to be 30-50 ℃, the solidification speed in the electroslag process is slower, the metal molten pool in the crystallizer is relatively deeper, and the floating of nonmetallic inclusion in steel is facilitated.
Detailed Description
Example 1: a smelting method for controlling large-size inclusion 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 component requirements in the technical standard of products 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 to 22.00 percent of Mn, less than or equal to 4.00 percent of Ni, 16.50 to 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 to 0.60 percent of N and the balance of iron. And (3) carrying out internal control on part of alloy elements: si 0.40-0.60% and Al less than or equal to 0.010%.
The specific smelting steps are as follows:
step 1), smelting raw materials in an induction furnace, namely 4.5t of a return stub bar with P less than or equal to 0.010%, 1.8t of ferrochrome, 50kg of ferromolybdenum, 200kg of nickel plate, and adding 100kg of lime into the induction furnace before adding the raw materials;
step 2), firstly oxidizing smelting and then reducing smelting during smelting in an argon-oxygen furnace, blowing oxygen and decarbonizing to 0.016% in an oxidation period, adding 50kg of fluorite and 300kg of lime in a reduction period for slagging, controlling the alkalinity of slag to be 2.0, adding 2000kg of electrolytic manganese to adjust the manganese content, adding 350kg of ferrosilicon and 70kg of aluminum ingot for oxygen blowing, heating and reducing, then supplementing alloy fine tuning components according to a sampling chemical analysis result and process target components, adding 200kg of nitriding alloy to adjust the nitrogen content, and enabling the components to meet the requirement of tapping;
step 3), adding steel into the steel ladle, wherein the bottom blowing nitrogen flow is 230 m/h, and 10kg of silicon-calcium wires are fed into the steel ladle by adopting special wire feeding equipment, wherein the specification of the silicon-calcium wires is 13mm, and the wire feeding speed is 50m/min;
step 4), hanging and packaging to cast electrode blanks with the specification of phi 420mm and 3200mm, demoulding, cutting a riser along a riser line, and air-cooling;
step 5), polishing and cleaning scum, floating dust, floating rust and the like on the surface of the electrode blank by adopting a grinder, welding a dummy electrode at the riser end of the electrode blank, and then remelting electroslag slag in a phi 580/620mm specification crystallizer by adopting 60% -CaF 2 +20%-Al 2 O 3 +20% -CaO full premelting slag, nitrogen protection is adopted in the electroslag process, and the nitrogen flow is 20Nm 3 And/h, adopting a high-voltage low-current power supply system, controlling the highest secondary voltage to 66V, the highest current to 12500A, controlling the fluctuation range of the current to +/-30% - +/-50%, and controlling the water inlet and outlet temperature difference of the circulating water of the crystallizer to 32-47 ℃.
Step 6), electroslag ingot inspection and down-turning forging.
Two groups of smelting are respectively carried out by adopting a conventional smelting method and a smelting method according to the embodiment, 3 electroslag ingots are produced in each group, nonmetallic inclusion is detected by sampling at two ends of a tail cap after the electroslag ingots are forged, and the nonmetallic inclusion detection statistical result of the high-nitrogen austenitic stainless steel product produced by adopting the conventional smelting method and the smelting method of the embodiment is shown as 1:
TABLE 1 nonmetallic inclusion
| Classification | Number of samples | There is a large size of non-goldNumber of samples of inclusions | Average diameter of large-size nonmetallic inclusion |
| Conventional method | 30 pieces | 8 pieces of | 18.75μm |
| This embodiment | 30 pieces | 1 number of | 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 ratio of the nonmetallic inclusions 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 this example, only 2 large-size nonmetallic inclusions were present, with a ratio of 6.67%, and the average diameter of the large-size nonmetallic inclusions was 15. Mu.m.
The large-size nonmetallic inclusion in the Cr-Mn-Ni high-nitrogen austenitic stainless steel of the embodiment is reduced by 20 percent compared with the conventional process, and the average diameter of the large-size nonmetallic inclusion is reduced by 3.75 mu m compared with the conventional process. The invention has remarkable effect on controlling the number and the diameter of large-size inclusions in Cr-Mn-Ni high-nitrogen austenitic stainless steel, and provides basic guarantee for improving the product performance.
Claims (1)
1. A smelting method for controlling large-size inclusion in Cr-Mn-Ni high-nitrogen austenitic stainless steel is characterized in that the smelting method adopts a process route of 'induction furnace smelting + argon oxygen furnace smelting + die casting electrode blank + electroslag remelting' for production, and the chemical composition of the product requires: less than or equal to 0.05 percent of C, less than or equal to 1.00 percent of Si, 16.00 to 22.00 percent of Mn, less than or equal to 4.00 percent of Ni, 16.50 to 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 to 0.60 percent of N, and the balance of iron, wherein the smelting process carries out internal control on part of alloy elements: si is 0.40-0.60%, al is less than or equal to 0.010%; the specific smelting steps are as follows:
step 1), during induction furnace smelting, raw materials are carefully selected, low-phosphorus steel seeds are returned to a feed head by 400-600 kg/t, ferrochrome by 200-300 kg/t, ferromolybdenum by 5-10 kg/t and nickel plates by 20-30 kg/t, and lime with the planned amount of molten steel of 1% -4% is added into the furnace before feeding;
step 2), firstly oxidizing smelting and then reducing smelting during smelting in an argon-oxygen furnace, blowing oxygen and decarbonizing in an oxidation period until the carbon content is lower than 0.02%, adding fluorite 5-10 kg/t and lime 30-50 kg/t in a reduction period for slagging, controlling the alkalinity of slag to be 1.5-2.5, adding electrolytic manganese to be 200-300 kg/t for adjusting the manganese content, adding ferrosilicon to be 30-50 kg/t and aluminum ingot to be 7-10 kg/t for oxygen blowing, heating and reducing, and supplementing alloy fine-tuning components according to a sampling chemical analysis result and process target components, blowing nitrogen and supplementing nitrogen alloy to be 20-40 kg/t for adjusting the nitrogen content, wherein the components meet the requirement of tapping;
step 3), adding steel into a steel ladle, blowing nitrogen at the bottom of 100-300 m/h, controlling the total weak stirring time of molten steel in the steel ladle to be 7-11 min, and feeding a calcium silicate wire into the steel ladle by using special wire feeding equipment at the time of weak stirring for 3-5 min at the speed of 40-100 m/min, wherein the wire feeding speed is controlled between 0.8-1.5 kg/t of the calcium silicate wire with the specification phi 8-phi 16 mm;
step 4), pouring the hanging bag into an electrode blank, removing a riser along a riser line after demoulding, and transferring to an electroslag procedure after air cooling;
step 5), polishing the surface of the electrode blank by using a grinder to clean scum, floating dust and floating rust by using visible light, welding a false electrode, and remelting electroslag; during electroslag remelting, the dummy electrode must be welded at the electrode blank riser end, the electroslag process adopts nitrogen protection, and the nitrogen flow is 30-10 Nm 3 And/h, the slag system used for electroslag remelting is 60% -CaF 2 +20%-Al 2 O 3 +20% -CaO full premelting slag; the electroslag remelting process adopts a high-voltage low-current power supply system, and the highest secondary voltage (unit: V) is k of the diameter (unit: mm) of the crystallizer 1 Multiple, coefficient k 1 Taking 0.09-0.12, taking a large value from a small ingot, and taking a small value from a large ingot; the highest current (unit: A) is k of the crystallizer diameter (unit: mm) 2 Multiple, coefficient k 2 Taking 20 to the upper part25, taking small value from small ingot, taking large value from large ingot, controlling the fluctuation range of current to +/-30% - +/-50%, and controlling the temperature difference of circulating water entering and exiting the crystallizer to 30-55 ℃;
step 6), electroslag ingot inspection and down-turning forging.
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 CN115354212A (en) | 2022-11-18 |
| CN115354212B true 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) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115354212A (en) | 2022-11-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102816979B (en) | Production method of low-carbon sulfur series free-cutting steel continuous casting billet | |
| CN110565012B (en) | Continuous casting manufacturing method of ultra-high chromium ferrite stainless steel | |
| CN102021488A (en) | Steel for nuclear-island seamless steel tube and production method thereof | |
| CN108893682B (en) | Die steel billet and preparation method thereof | |
| CN113088812A (en) | High-strength-toughness ultralow-temperature impact-resistant tubing head forging blank and manufacturing method thereof | |
| CN113385647A (en) | High-carbon high-manganese steel vertical bending type slab continuous casting method | |
| CN115354212B (en) | Smelting method for controlling large-size inclusion in Cr-Mn-Ni high-nitrogen austenitic stainless steel | |
| CN114941101B (en) | Steel for bearing shaft of automobile engine and production method thereof | |
| CN114480987A (en) | Rare earth-containing NM600 wear-resistant steel plate and preparation method thereof | |
| CN111304532B (en) | Heat-resistant austenitic stainless steel and preparation method thereof | |
| CN110714161B (en) | High-sulfur free-cutting steel for automobile and production process thereof | |
| CN103233092B (en) | Process for smelting steel special for corrosion-resistant heat exchanger | |
| CN103114248B (en) | Steel for drilling tools and method for smelting steel for drilling tools | |
| CN115109986B (en) | Large-size electroslag remelting high manganese steel forging stock and manufacturing method thereof | |
| CN110952025A (en) | Mining wear-resistant KYNM500 steel and preparation method thereof | |
| CN113913676B (en) | Metallurgy method for improving morphology of as-cast sulfide of medium-carbon high-sulfur free-cutting steel | |
| CN114000046A (en) | Large-section austenitic stainless steel forged bar with low ferrite content and manufacturing process thereof | |
| CN113718104A (en) | Preparation process of low-oxygen high-titanium-iron alloy | |
| CN113186445A (en) | Method for controlling inclusion content of stainless steel product | |
| CN113136523A (en) | Process for smelting nitrogen-containing duplex stainless steel in argon-oxygen furnace | |
| CN111534742A (en) | Pipe blank for preventing internal cracks of steel pipe blank of gas cylinder, manufacturing method and application | |
| CN110951940A (en) | Method for continuously casting nickel-based alloy by large-size round billet | |
| CN115558839B (en) | Production method of P91 steel ingot | |
| CN114959183B (en) | Refining slag system based on aluminum deoxidized Cr5 supporting roller steel and application process thereof | |
| CN116121629B (en) | Preparation method of gear steel 18CrNiMo7-6 |
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 |