CN116287802A - Manufacturing method of C276 alloy square flat material - Google Patents
Manufacturing method of C276 alloy square flat material Download PDFInfo
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- CN116287802A CN116287802A CN202310190452.XA CN202310190452A CN116287802A CN 116287802 A CN116287802 A CN 116287802A CN 202310190452 A CN202310190452 A CN 202310190452A CN 116287802 A CN116287802 A CN 116287802A
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 42
- 239000000956 alloy Substances 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 title claims abstract description 25
- 238000005242 forging Methods 0.000 claims abstract description 80
- 238000003723 Smelting Methods 0.000 claims abstract description 62
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000007670 refining Methods 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 11
- 238000005520 cutting process Methods 0.000 claims abstract description 10
- 238000003801 milling Methods 0.000 claims abstract description 6
- 238000004513 sizing Methods 0.000 claims abstract description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 24
- 229910052786 argon Inorganic materials 0.000 claims description 16
- 238000005266 casting Methods 0.000 claims description 11
- 239000002893 slag Substances 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 238000011010 flushing procedure Methods 0.000 abstract 1
- 238000005303 weighing Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 10
- 238000001514 detection method Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910000601 superalloy Inorganic materials 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- 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
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/023—Alloys based on nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- Engineering & Computer Science (AREA)
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Abstract
The invention provides a manufacturing method of a C276 alloy square flat bar, which comprises the following steps: weighing metal Ni, metal Cr, metal W, metal Mo and pure Fe, adding into a smelting furnace, smelting, vacuumizing, refining, argon-flushing, and pouring to obtain an electrode rod; s2, performing barreling treatment on the electrode rod, and performing electroslag remelting to obtain an electroslag ingot; s3, performing sizing cutting on the electroslag ingot; s4, axially forging and pressing the electroslag ingot through a forging press to axially deform the electroslag ingot, so as to obtain a forged ingot I; s5, clamping two ends of a forging ingot by a forging press, forging the forging ingot into rectangular pieces along the radial direction of the first forging ingot, and finally forging the rectangular pieces into square and flat blanks along the axial direction by the forging press; s6, mechanically milling the forged square and flat blank to obtain a target product. The method for manufacturing the C276 alloy square and flat material ensures the surface quality of the electroslag ingot, ensures that the axial deformation is more uniform by customizing the height-diameter ratio of the electroslag ingot, and ensures that the microscopic grain structure of the material is more uniform by alternately carrying out the axial deformation and the radial deformation.
Description
Technical Field
The invention relates to the technical field of high-temperature alloy, in particular to a manufacturing method of a C276 alloy square flat material.
Background
The C276 alloy is an alloy which takes Ni as a matrix and adds a large amount of Cr and Mo elements to improve corrosion resistance, and the high-temperature alloy has excellent high-temperature durable strength, oxidation resistance, corrosion resistance and other performances, and can be widely applied to the industries of nuclear power, aerospace, petrochemical industry and the like; the C276 alloy is a typical Ni-Cr-Mo series deformation superalloy, has excellent welding performance due to low carbon content and optimized composition, can ensure corrosion resistance without heat treatment after welding, and is an important superalloy in the application fields of nuclear power and the like.
Disclosure of Invention
The invention aims to overcome and supplement the defects existing in the prior art, and provides a manufacturing method of a C276 alloy square and flat material, wherein a metal raw material required by C276 is manufactured by melting in a vacuum induction furnace, refining in a low vacuum, casting into an electrode, polishing, electroslag remelting in protective atmosphere, forging and polishing, and the vacuum induction furnace is adopted for melting, so that the accurate control of chemical components can be realized, the lower C, si content (C < 0.01 percent; si < 0.08 percent) can be ensured, better metallurgical structure can be obtained by adjusting electroslag remelting, and the appearance size of 150 multiplied by 900mm and relatively uniform structure performance can be achieved by forging.
The technical scheme adopted by the invention is as follows:
a method for manufacturing a C276 alloy square flat bar, wherein: the manufacturing method of the alloy square flat comprises the following steps:
s1, according to mass fraction, the C276 alloy square flat material comprises the following components: 15.0 to 16.0 percent of Cr, 15.2 to 16.0 percent of Mo, 4.5 to 6.0 percent of Fe, 3.5 to 4.0 percent of W and the balance of Ni and unavoidable impurity elements, wherein the sum of the Ni, the Cr, the W, the Mo and the Fe is 100 percent, the surfaces of raw materials and returned materials are required to be clean and dry, have no greasy dirt and oxidation, have accurate chemical components and have the purity of more than 99 percent, the raw materials are added into a smelting furnace for smelting and vacuumizing, the vacuum degree is controlled to be less than or equal to 15Pa, the vacuum degree is controlled to be less than or equal to 5Pa for refining after the ingredients are completely melted, argon is flushed after refining and casting is carried out, and an electrode bar is obtained;
s2, performing barreling treatment on the electrode rod, ensuring that the surface of the electrode is free of defects such as heavy skin and flying thorns, avoiding pollution to a metal molten pool in the electroslag remelting process, adding the electrode rod into a smelting furnace for smelting, adopting a smelting mode of 'filling end' for melting first, facilitating stability control of current and smelting rate in the electroslag remelting process in a formal smelting stage, aiming at obtaining good surface quality of the electroslag ingot, adding a ternary slag system into the smelting furnace for electroslag remelting for 40-60min, and then smelting for 12-18h to obtain the electroslag ingot, wherein argon is filled in the smelting process to control oxygen content within 1%, isolating air as much as possible, and reducing reaction of alloy with oxygen and nitrogen in the atmosphere to obtain the electroslag ingot;
s3, performing sizing cutting on the electroslag ingot, wherein the length-diameter ratio of the electroslag ingot after cutting is controlled to be 2.0-2.5; height-to-diameter ratio H: d=2.0 to 2.5 can ensure more uniform radial deformation in the subsequent upsetting process, and then the cut electroslag ingot is heated and kept warm; the heating temperature is controlled to be 1210-1230 ℃, and the heat preservation time is controlled to be 7-10 h; the purpose is to fully heat the inside and the outside of the electroslag ingot so that the material temperature of the electroslag ingot is in the optimal recrystallization temperature range in the subsequent forging heat deformation process;
s4, axially deforming the electroslag ingot in the step S3 by axially forging and pressing the electroslag ingot through a forging press, and removing part of as-cast dendrite tissues and simultaneously increasing the radial cross-sectional area through axial deformation so as to meet the size requirement of a subsequent flat material to obtain a forged ingot I;
s5, clamping two ends of one end and the tail of a forging ingot by a free forging press, radially deforming the forging ingot along the radial forging press of the forging ingot, forging the forging ingot into a rectangular piece by a round piece, heating and preserving heat for one time, returning the rectangular piece to the furnace for multiple times in the process of S5, preserving heat for 45-120 min at 1220+/-10 ℃, and finally axially forging and pressing the rectangular piece by the forging press, switching the radial deformation into the axial deformation, and secondarily heating and preserving heat to forge the rectangular piece into a square flat blank;
s6, mechanically milling the forged square and flat blank to obtain a target product.
Preferably, the method for manufacturing the C276 alloy square flat bar material comprises the following steps: the melting temperature of the step S1 is 1500-1520 ℃, the refining time is 1-10h, and the casting temperature is 1470-1490 ℃.
Preferably, the method for manufacturing the C276 alloy square flat bar material comprises the following steps: and the vacuum degree of argon filling in the step S1 is 4000-6000 Pa.
Preferably, the method for manufacturing the C276 alloy square flat bar material comprises the following steps: and S2, controlling the voltage of electroslag remelting to be 30-38V, controlling the smelting voltage to be 31-35V and the smelting current to be 11000-13500A.
Preferably, the method for manufacturing the C276 alloy square flat bar material comprises the following steps: the ternary slag system in the step S2 comprises CaF 2 、Al 2 O 3 And CaO, the mass ratio is 67-73: 14-16: 14 to 16.
Preferably, the method for manufacturing the C276 alloy square flat bar material comprises the following steps: the length ratio of the forging ingot I to the electroslag ingot in the step S4 is 62-70:100; the linear speed of the electroslag ingot under axial forging through a forging press is 15-20 mm/s.
Preferably, the method for manufacturing the C276 alloy square flat bar material comprises the following steps: the primary heating temperature in the step S5 is 1210-1230 ℃, and the heat preservation time is 45-120 min; the secondary heating temperature is 1090-1110 ℃, and the heat preservation time is 30-60 min.
The invention has the advantages that:
(1) According to the manufacturing method of the C276 alloy square and flat material, the high-quality raw materials are selected, so that the residual C, si element is prevented from being brought in; optimizing the element component proportion, precisely controlling the chemical components after vacuum induction smelting, and remelting in a protective atmosphere to isolate the reaction of the material and O, N elements in the atmosphere; the fluctuation range of smelting parameters of electroslag remelting is reduced, the surface quality of an electroslag ingot is ensured, the axial deformation is more uniform by a method for customizing the height-diameter ratio of the electroslag ingot, and the microscopic grain structure of the material is more uniform by alternate axial deformation and radial deformation.
Drawings
FIG. 1 is a scanning electron microscope image of a C276 alloy square flat bar material of example 1 of the present invention.
Detailed Description
The invention will be further described with reference to the following specific drawings and examples.
Example 1
A method for manufacturing a C276 alloy square flat bar, wherein: the manufacturing method of the alloy square flat comprises the following steps:
s1, according to mass fraction, the C276 alloy square flat material comprises the following components: 15.0 to 16.0 percent of Cr, 15.2 to 16.0 percent of Mo, 4.5 to 6.0 percent of Fe, 3.5 to 4.0 percent of W and the balance of Ni and unavoidable impurity elements, wherein the sum of the Ni, the Cr, the W, the Mo and the Fe is 100 percent, the raw materials are added into a smelting furnace for smelting and vacuumizing, the vacuum degree is controlled to be less than or equal to 15Pa, after ingredients are completely melted, the vacuum degree is controlled to be less than or equal to 5Pa for refining, argon is flushed after refining, and the electrode bar is obtained after casting; the melting temperature is 1500-1520 ℃, the refining time is 1h, and the casting temperature is 1479 ℃; the vacuum degree of argon filling is 6000Pa;
s2, performing barreling treatment on an electrode side with phi 440mm, wherein the surface grinding light quantity is 3mm, then adding an electrode rod into a smelting furnace for smelting, wherein the electrode rod adopts a smelting mode of 'filling end' for smelting firstly, so that stability control of current and smelting rate in an electroslag remelting process in a formal smelting stage is facilitated, the purpose of obtaining good surface quality of an electroslag ingot is achieved, a ternary slag system is added into the smelting furnace for electroslag remelting for 50min, and then smelting is performed for 12h to obtain an electroslag ingot with phi 508mm, the oxygen content is controlled within 1% in the smelting process, and the Ar gas flow is 8.0L/min, so that the electroslag ingot is obtained; controlling the voltage of electroslag remelting to be 30-38V, controlling the smelting voltage to be 31-35V and the smelting current to be 11000-13500A; the ternary slag system comprises CaF2 and Al 2 O 3 And CaO, the mass ratio is 70:15:15;
s3, performing sizing cutting on the electroslag ingot with the diameter phi of 508mm, wherein the length-diameter ratio of the electroslag ingot after cutting is controlled to be 2.25; heating and preserving heat of the cut electroslag ingot; the heating temperature is controlled to be 1210-1230 ℃, and the heat preservation time is 8 hours;
s4, axially forging and pressing the electroslag ingot obtained in the step S3 through a forging press to axially deform the electroslag ingot, so as to obtain a forged ingot I; the length ratio of the first forging ingot to the electroslag ingot is 65:100; the linear speed of the electroslag ingot under axial forging through a forging press is 15mm/s;
s5, clamping two ends of one end of a forging ingot by a free forging press, radially deforming the forging ingot along the radial forging press of the forging ingot, wherein the overall reduction rate is not more than 25% of the total stroke until the radial dimension of the forging ingot is changed from round deformation to a rectangle with the diameter of 200+/-50 x 920+/-20 mm, heating and preserving heat of a rectangular piece at 1210-1230 ℃ for 45min, and finally axially forging and pressing the rectangular piece by the forging press, and secondarily heating and preserving heat at 1090-1110 ℃ for 30min to forge the rectangular piece into a square flat blank with the diameter of 175 x 925 mm;
s6, mechanically milling the forged square and flat blank to obtain a target product with the thickness of 150 multiplied by 900mm, performing contact method 100% ultrasonic detection on the target product, and warehousing and shipping after the target product is qualified.
Example 2
A method for manufacturing a C276 alloy square flat bar, wherein: the manufacturing method of the alloy square flat comprises the following steps:
s1, according to mass fraction, the C276 alloy square flat material comprises the following components: 15.0 to 16.0 percent of Cr, 15.2 to 16.0 percent of Mo, 4.5 to 6.0 percent of Fe, 3.5 to 4.0 percent of W and the balance of Ni and unavoidable impurity elements, wherein the sum of the Ni, the Cr, the W, the Mo and the Fe is 100 percent, the raw materials are added into a smelting furnace for smelting and vacuumizing, the vacuum degree is controlled to be less than or equal to 15Pa, after ingredients are completely melted, the vacuum degree is controlled to be less than or equal to 5Pa for refining, argon is flushed after refining, and the electrode bar is obtained after casting; the melting temperature is 1500-1520 ℃, the refining time is 5h, and the casting temperature is 1477 ℃; the vacuum degree of argon filling is 6000Pa;
s2, performing barreling treatment on an electrode side with phi 440mm, wherein the surface grinding light quantity is 4mm, then adding an electrode rod into a smelting furnace for smelting, wherein the electrode rod adopts a smelting mode of 'filling end' for smelting firstly, so that stability control of current and smelting rate in an electroslag remelting process in a formal smelting stage is facilitated, the purpose is to obtain good surface quality of an electroslag ingot, adding a ternary slag system into the smelting furnace for electroslag remelting for 50min, and then smelting for 12h to obtain an electroslag ingot with phi 508mm, wherein argon filling gas content is controlled within 1%, and Ar gas flow is 8.3L/min, so as to obtain the electroslag ingot; controlling the voltage of electroslag remelting to be 30-38V, controlling the smelting voltage to be 31-35V and the smelting current to be 11000-13500A; the ternary slag system comprises CaF2 and Al 2 O 3 And CaO, the mass ratio is 70:15:15;
s3, performing sizing cutting on the electroslag ingot with the diameter phi of 508mm, wherein the length-diameter ratio of the electroslag ingot after cutting is controlled to be 2.28; heating and preserving heat of the cut electroslag ingot; the heating temperature is controlled to be 1210-1230 ℃, and the heat preservation time is 8 hours;
s4, axially forging and pressing the electroslag ingot obtained in the step S3 through a forging press to axially deform the electroslag ingot, so as to obtain a forged ingot I; the length ratio of the first forging ingot to the electroslag ingot is 67:100; the linear speed of the electroslag ingot under axial forging through a forging press is 15mm/s;
s5, clamping two ends of one end of a forging ingot by a free forging press, radially deforming the forging ingot along the radial forging press of the forging ingot, wherein the overall reduction rate is not more than 25% of the total stroke until the radial dimension of the forging ingot is changed from round deformation to a rectangle with the diameter of 200+/-50 x 920+/-20 mm, heating and preserving heat of a rectangular piece at 1210-1230 ℃ for 100min, and finally axially forging and pressing the rectangular piece by the forging press, and secondarily heating and preserving heat at 1090-1110 ℃ for 40min to forge the rectangular piece into a square flat blank with the diameter of 175 x 925 mm;
s6, mechanically milling the forged square and flat blank to obtain a target product with the thickness of 150 multiplied by 900mm, performing contact method 100% ultrasonic detection on the target product, and warehousing and shipping after the target product is qualified.
Example 3
A method for manufacturing a C276 alloy square flat bar, wherein: the manufacturing method of the alloy square flat comprises the following steps:
s1, according to mass fraction, the C276 alloy square flat material comprises the following components: 15.0 to 16.0 percent of Cr, 15.2 to 16.0 percent of Mo, 4.5 to 6.0 percent of Fe, 3.5 to 4.0 percent of W and the balance of Ni and unavoidable impurity elements, wherein the sum of the Ni, the Cr, the W, the Mo and the Fe is 100 percent, the raw materials are added into a smelting furnace for smelting and vacuumizing, the vacuum degree is controlled to be less than or equal to 15Pa, after ingredients are completely melted, the vacuum degree is controlled to be less than or equal to 5Pa for refining, argon is flushed after refining, and the electrode bar is obtained after casting; the melting temperature is 1500-1520 ℃, the refining time is 10 hours, and the casting temperature is 1485 ℃; the vacuum degree of argon filling is 6000Pa;
s2, performing barreling treatment on an electrode side with phi 440mm, wherein the surface grinding quantity is 5mm, then adding an electrode rod into a smelting furnace for smelting, wherein the electrode rod adopts a smelting mode of 'filling end' for smelting firstly, so that stability control of current and smelting rate in an electroslag remelting process in a formal smelting stage is facilitated, the purpose is to obtain good surface quality of an electroslag ingot, adding a ternary slag system into the smelting furnace for electroslag remelting for 50min, and then smelting for 12h to obtain an electroslag ingot with phi 508mm, wherein argon filling gas content is controlled within 1%, and Ar gas flow is 8.0L/min, so as to obtain the electroslag ingot; controlling the voltage of electroslag remelting to be 30-38V, controlling the smelting voltage to be 31-35V and the smelting current to be 11000-13500A; the ternary slag system comprises CaF 2 、Al 2 O 3 And CaO, the mass ratio is 70:15:15;
s3, performing sizing cutting on the electroslag ingot with the diameter phi of 508mm, wherein the length-diameter ratio of the electroslag ingot after cutting is controlled to be 2.25; heating and preserving heat of the cut electroslag ingot; the heating temperature is controlled to be 1210-1230 ℃, and the heat preservation time is 8 hours;
s4, axially forging and pressing the electroslag ingot obtained in the step S3 through a forging press to axially deform the electroslag ingot, so as to obtain a forged ingot I; the length ratio of the first forging ingot to the electroslag ingot is 64:100; the linear speed of the electroslag ingot under axial forging by a forging press was 15mm/s.
S5, clamping two ends of one end of a forging ingot by a free forging press, radially deforming the forging ingot along the radial forging press of the forging ingot, wherein the overall reduction rate is not more than 25% of the total stroke until the radial dimension of the forging ingot is changed from round deformation to a rectangle with the diameter of 200+/-50 x 920+/-20 mm, heating and preserving heat of a rectangular piece at 1210-1230 ℃ for 120min, and finally axially forging and pressing the rectangular piece by the forging press, and secondarily heating and preserving heat at 1090-1110 ℃ for 60min to forge the rectangular piece into a square flat blank with the diameter of 175 x 925 mm;
s6, mechanically milling the forged square and flat blank to obtain a target product with the thickness of 150 multiplied by 900mm, performing contact method 100% ultrasonic detection on the target product, and warehousing and shipping after the target product is qualified.
The elemental composition detection results of examples 1-3 were as follows:
TABLE 1 elemental composition wt%
As can be seen from Table 1, the C276 alloy Fang Biancai produced in examples 1-3 has precisely controlled chemical composition after vacuum induction melting.
2. Grain size of
The scanning electron microscope images of the 150X900mm square flat bars of the examples 1-3 and the example 1 are shown in FIG. 1, wherein the central grain sizes are respectively 5 grade, 4.5 grade and 5 grade.
3. Ultrasonic detection result
The square and flat materials in examples 1-3 are qualified according to GB/T4162 equivalent flat bottom hole phi 3.0mm, the clutter is smaller than-6 dB, and the bottom wave loss is smaller than 6dB.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (7)
1. A manufacturing method of a C276 alloy square flat bar is characterized by comprising the following steps: the manufacturing method of the alloy square flat comprises the following steps:
s1, according to mass fraction, the C276 alloy square flat material comprises the following components: 15.0 to 16.0 percent of Cr, 15.2 to 16.0 percent of Mo, 4.5 to 6.0 percent of Fe, 3.5 to 4.0 percent of W and the balance of Ni and unavoidable impurity elements, wherein the sum of the Ni, the Cr, the W, the Mo and the Fe is 100 percent, the raw materials are added into a smelting furnace for smelting and vacuumizing, the vacuum degree is controlled to be less than or equal to 15Pa, after ingredients are completely melted, the vacuum degree is controlled to be less than or equal to 5Pa for refining, argon is flushed after refining, and the electrode bar is obtained after casting;
s2, performing barreling treatment on the electrode rod, then adding the electrode rod into a smelting furnace for smelting, adding a ternary slag system into the smelting furnace for electroslag remelting for 40-60min, and then smelting for 12-18h to obtain an electroslag ingot, wherein argon is filled in the smelting process to control the oxygen content to be within 1%, so as to obtain the electroslag ingot;
s3, performing sizing cutting on the electroslag ingot, controlling the length-diameter ratio of the cut electroslag ingot to be 2.0-2.5, heating and preserving heat of the cut electroslag ingot, controlling the heating temperature to be 1210-1230 ℃ and preserving heat for 7-10 hours;
s4, axially forging and pressing the electroslag ingot obtained in the step S3 through a forging press to axially deform the electroslag ingot, so as to obtain a forged ingot I;
s5, clamping two ends of a forging ingot by a free forging press, radially deforming the forging ingot along the radial forging press of the forging ingot I, forging the forging ingot I into a rectangular piece by a round piece, heating and preserving heat for the rectangular piece at one time, and finally axially forging and pressing the rectangular piece by the forging press, heating and preserving heat for the second time, and forging into a square flat blank;
s6, mechanically milling the forged square and flat blank to obtain a target product.
2. The method for manufacturing a C276 alloy square flat bar according to claim 1, wherein: the melting temperature of the step S1 is 1500-1520 ℃, the refining time is 1-10h, and the casting temperature is 1470-1490 ℃.
3. The method for manufacturing a C276 alloy square flat bar according to claim 1, wherein: and the vacuum degree of argon filling in the step S1 is 4000-6000 Pa.
4. The method for manufacturing a C276 alloy square flat bar according to claim 1, wherein: and S2, controlling the voltage of electroslag remelting to be 30-38V, controlling the smelting voltage to be 31-35V and the smelting current to be 11000-13500A.
5. The method for manufacturing a C276 alloy square flat bar according to claim 1, wherein: the ternary slag system in the step S2The component (C) is CaF 2 、Al 2 O 3 And CaO, the mass ratio is 67-73: 14-16: 14 to 16.
6. The method for manufacturing a C276 alloy square flat bar according to claim 1, wherein: the length ratio of the forging ingot I to the electroslag ingot in the step S4 is 62-70:100; the linear speed of the electroslag ingot under axial forging through a forging press is 15-20 mm/s.
7. The method for manufacturing a C276 alloy square flat bar according to claim 1, wherein: the primary heating temperature in the step S5 is 1210-1230 ℃, and the heat preservation time is 45-120 min; the secondary heating temperature is 1090-1110 ℃, and the heat preservation time is 30-60 min.
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