CN112536420A - Preparation process of eccentric casting wear-resistant bent pipe - Google Patents
Preparation process of eccentric casting wear-resistant bent pipe Download PDFInfo
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- CN112536420A CN112536420A CN202011301240.7A CN202011301240A CN112536420A CN 112536420 A CN112536420 A CN 112536420A CN 202011301240 A CN202011301240 A CN 202011301240A CN 112536420 A CN112536420 A CN 112536420A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D35/00—Equipment for conveying molten metal into beds or moulds
- B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
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- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/40—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
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- 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
- Y02P10/20—Recycling
Abstract
The invention discloses a preparation process of an eccentric casting wear-resistant elbow, in particular to the technical field of elbows, the invention adopts a pouring mode, simultaneously, the casting melt is discharged at high temperature and poured at low temperature in the pouring process, the high temperature discharge is convenient to carry out slag removal and degassing on the casting melt, the defects of slag inclusion, air holes and the like in the casting melt are reduced, the low temperature pouring can prevent shrinkage porosity, reduce the casting defects of sand sticking, precipitated gas, coarse crystal grains and the like, simultaneously, the slow, fast and slow pouring modes are adopted, the impact of the casting melt on molding sand can be reduced, the gas discharge is facilitated, the cold shut condition is prevented, the quality of elbow blanks in the pouring process can be ensured, the content of manganese is 11-14 percent, high manganese steel can ensure that the strength and the wear resistance of the elbows are more ideal, the elbows are produced by adopting the pouring mode, the thicknesses of the side walls of the elb, the practicability of the bent pipe can be ensured to be more ideal to a certain extent.
Description
Technical Field
The invention relates to the technical field of bent pipes, in particular to a preparation process of an eccentric casting wear-resistant bent pipe.
Background
The traditional pipeline is a concentric pipeline, the rear stretching surface of the bent pipe is thinned, the compression surface is thickened, the thickening amount is larger than the thinning amount, and the thickening of the inner side of the small-radius pipeline is particularly obvious. This thickening is unnecessary from a design point of view, and excessive thickening also has some effect on the piping system. In order to solve the problems that the rear stretching surface of the bent pipe is thinned, the compression surface is thickened and the thickening amount needs to be larger than the thinning amount in the prior art, an eccentric straight pipe is designed. The tube wall thickness of a lateral wall of the eccentric pipeline is greater than the tube wall thickness of the other side, so that after the side with the greater tube wall thickness and the side with the smaller tube wall thickness are bent to form the eccentric elbow, the side with the greater tube wall thickness is stretched, and the side with the smaller tube wall thickness is compressed, so that the thicknesses of the stretching surface and the compression surface are closer, the condition that the stretching surface of the elbow is too thin and the compression surface of the elbow is too thick is avoided, the quality of the elbow is improved, and the service life of the elbow is prolonged.
The existing eccentric elbow pipe adopts different preset thicknesses of the side wall to solve the problems, but the stretching and compressing amount and the position of the side wall are difficult to accurately ensure, so that the situation that part of the side wall is too thin or too thick can occur, meanwhile, the existing elbow pipe mostly adopts common carbon steel, the strength and the wear resistance of the elbow pipe are not ideal enough, and the service performance of the elbow pipe can be influenced, so that a wear-resistant elbow pipe preparation process is needed to solve the problems.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a preparation process of an eccentric casting wear-resistant elbow, and the technical problems to be solved by the invention are as follows: the existing manufacturing method of the bent pipe adopts a method that different thicknesses are preset on the side wall for bending, the operation process is difficult to accurately control the compression and the stretching of the thickness of the side wall, and meanwhile, the strength and the wear resistance of the bent pipe are not ideal enough, so that the use performance of the bent pipe is possibly influenced.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation process of an eccentric casting wear-resistant bent pipe comprises the following steps:
s1, making a casting mold by using the molding sand and the core sand as molding materials, drying the molding sand and the core sand in an oven before the casting mold, wherein the molding sand and the core sand are directly put into the oven in the drying process, the molding sand and the core sand are heated at 50-60 ℃ and kept at the temperature for 10min, then the oven is controlled to raise the temperature to 150-170 ℃ and kept for 5min for inconvenience, finally the temperature of the molding sand and the core sand is reduced to room temperature by adopting a natural cooling mode, and then the mold is made according to the drawing requirements.
S2, selecting casting raw materials, wherein the casting raw materials are mixed raw materials consisting of 10-20% of recycled iron, 60-75% of pig iron and 20-25% of waste steel, the used waste steel and recycled iron are cleaned before use to remove surface rust, impurities and soil, and the pig iron, the waste steel and recycled iron are required to remove surface oxidation layers before use.
S3, putting the mixed raw materials into an electric arc furnace for smelting, putting various raw materials into the bottom of the electric arc furnace layer by layer according to the principle that the raw materials are tight at the bottom and loose at the top, controlling the smelting temperature at 1550 ℃, and simultaneously adjusting chemical elements to ensure that the chemical elements comprise the following components in percentage by mass: mn: 11-14%, C: 1-1.5%, Si: 0.3-1.0 percent of the total weight of the alloy, less than or equal to 0.1 percent of P, less than or equal to 0.05 percent of S and the balance of Fe, adding a flux in the smelting process, and adding a pretreatment agent which takes Cr as a main component and Ni as an auxiliary component into the electric arc furnace before tapping the raw molten iron.
S4, slagging off the original liquid iron in S3, adding an inoculant into the slagging-off original liquid iron, pouring the original liquid iron into a pouring cup after primary inoculation is completed, adding a sulfur-oxygen inoculant into the pouring cup for secondary inoculation, spreading perlite on the original liquid iron again for slagging off to purify the original liquid iron and immediately slagging off after the secondary inoculation is completed, and standing the original liquid iron in the pouring cup for a period of time to obtain the final casting liquid iron.
S5, pouring the casting melt into a casting mold, wherein the pouring temperature is 1400-1450 ℃, pouring is carried out according to the principles of high-temperature tapping and low-temperature pouring, and meanwhile, slow pouring is carried out at the beginning of the pouring process, then fast pouring is carried out, slow pouring is carried out before the fast pouring is finished, the slow pouring is carried out according to the principles of slow, fast and slow, and the pouring time is kept between 60 and 100S.
S6, after pouring, carrying out heat preservation molding, cooling, taking out the casting to obtain a bent pipe rough blank, then carrying out water toughening treatment on the bent pipe rough blank, firstly heating the bent pipe rough blank to 1050-.
And S7, inspecting and processing the obtained semi-finished product, cleaning a foreign matter removing core on the surface of the semi-finished product, cutting off a casting head, polishing the surface of the semi-finished product to obtain a finished product, and inspecting and warehousing the finished product.
As a further scheme of the invention: the time of the first inoculation in the step S4 is kept at 100-300S, and the time of the second inoculation is kept at 50-65S.
As a further scheme of the invention: the speed of the quick casting in the S5 is 2 Kg/S.
As a further scheme of the invention: the flux in S3 may be one of limestone or fluorite.
The invention has the beneficial effects that:
1. according to the invention, a pouring mode is adopted, meanwhile, the casting solution is poured out at high temperature and poured at low temperature in the pouring process, the high-temperature tapping is convenient for removing slag and degassing from the casting solution, the defects of slag inclusion, air holes and the like in the casting solution are reduced, the low-temperature pouring can prevent shrinkage porosity, the casting defects of sand sticking, precipitated gas, coarse crystal grains and the like, meanwhile, the slow, fast and slow pouring modes are adopted, the impact of the casting solution on molding sand can be reduced, the gas discharge is facilitated, the cold shut condition is prevented, the quality of the blank of the bent pipe in the pouring process can be ensured, the content of manganese is 11-14%, the high manganese steel can ensure that the strength and the wear resistance of the bent pipe are more ideal, the bent pipe is produced by adopting the pouring mode, the thickness of the side wall of the bent pipe is ensured to be the same, and the.
2. According to the invention, the rough blank of the bent pipe is treated in a water toughening treatment mode, so that the strength and toughness of the blank of the bent pipe are improved, and the mechanical property of the bent pipe is ensured to be more ideal.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: comprises the following steps of (a) carrying out,
s1, making a casting mold by using the molding sand and the core sand as molding materials, drying the molding sand and the core sand in an oven before the casting mold, wherein the molding sand and the core sand are directly put into the oven in the drying process, the molding sand and the core sand are heated at 50-60 ℃ and kept at the temperature for 10min, then the oven is controlled to raise the temperature to 150-170 ℃ and kept for 5min for inconvenience, finally the temperature of the molding sand and the core sand is reduced to room temperature by adopting a natural cooling mode, and then the mold is made according to the drawing requirements.
S2, selecting casting raw materials, wherein the casting raw materials are mixed raw materials consisting of 10-20% of recycled iron, 60-75% of pig iron and 20-25% of waste steel, the used waste steel and recycled iron are cleaned before use to remove surface rust, impurities and soil, and the pig iron, the waste steel and recycled iron are required to remove surface oxidation layers before use.
S3, putting the mixed raw materials into an electric arc furnace for smelting, putting various raw materials into the bottom of the electric arc furnace layer by layer according to the principle that the raw materials are tight at the bottom and loose at the top, controlling the smelting temperature at 1550 ℃, and simultaneously adjusting chemical elements to ensure that the chemical elements comprise the following components in percentage by mass: mn: 11-14%, C: 1-1.5%, Si: 0.3-1.0 percent of the total weight of the alloy, less than or equal to 0.1 percent of P, less than or equal to 0.05 percent of S and the balance of Fe, adding a flux in the smelting process, and adding a pretreatment agent which takes Cr as a main component and Ni as an auxiliary component into the electric arc furnace before tapping the raw molten iron.
S4, slagging off the original liquid iron in S3, adding an inoculant into the slagging-off original liquid iron, pouring the original liquid iron into a pouring cup after primary inoculation is completed, adding a sulfur-oxygen inoculant into the pouring cup for secondary inoculation, spreading perlite on the original liquid iron again for slagging off to purify the original liquid iron and immediately slagging off after the secondary inoculation is completed, and standing the original liquid iron in the pouring cup for a period of time to obtain the final casting liquid iron.
And S5, pouring the casting melt into the casting mold, wherein the pouring temperature is 1450 ℃, pouring is carried out according to the principle of high-temperature tapping and low-temperature pouring, and meanwhile, slow pouring is carried out at the beginning of the pouring process, then fast pouring is carried out, slow pouring is carried out before the fast pouring is finished, the slow pouring is carried out according to the principle of slow, fast and slow, and the pouring time is kept between 60 and 100S.
S6, after pouring, carrying out heat preservation molding, cooling, taking out the casting to obtain a bent pipe rough blank, then carrying out water toughening treatment on the bent pipe rough blank, firstly heating the bent pipe rough blank to 1050-.
And S7, inspecting and processing the obtained semi-finished product, cleaning a foreign matter removing core on the surface of the semi-finished product, cutting off a casting head, polishing the surface of the semi-finished product to obtain a finished product, and inspecting and warehousing the finished product.
The time for the first inoculation in S4 is kept at 100-300S, and the time for the second inoculation is kept at 50-65S.
The speed of rapid casting in S5 is 2 Kg/S.
The flux in S3 may be one of limestone or fluorite.
Example 2: comprises the following steps of (a) carrying out,
s1, making a casting mold by using the molding sand and the core sand as molding materials, drying the molding sand and the core sand in an oven before the casting mold, wherein the molding sand and the core sand are directly put into the oven in the drying process, the molding sand and the core sand are heated at 50-60 ℃ and kept at the temperature for 10min, then the oven is controlled to raise the temperature to 150-170 ℃ and kept for 5min for inconvenience, finally the temperature of the molding sand and the core sand is reduced to room temperature by adopting a natural cooling mode, and then the mold is made according to the drawing requirements.
S2, selecting casting raw materials, wherein the casting raw materials are mixed raw materials consisting of 10-20% of recycled iron, 60-75% of pig iron and 20-25% of waste steel, the used waste steel and recycled iron are cleaned before use to remove surface rust, impurities and soil, and the pig iron, the waste steel and recycled iron are required to remove surface oxidation layers before use.
S3, putting the mixed raw materials into an electric arc furnace for smelting, putting various raw materials into the bottom of the electric arc furnace layer by layer according to the principle that the raw materials are tight at the bottom and loose at the top, controlling the smelting temperature at 1550 ℃, and simultaneously adjusting chemical elements to ensure that the chemical elements comprise the following components in percentage by mass: mn: 11-14%, C: 1-1.5%, Si: 0.3-1.0 percent of the total weight of the alloy, less than or equal to 0.1 percent of P, less than or equal to 0.05 percent of S and the balance of Fe, adding a flux in the smelting process, and adding a pretreatment agent which takes Cr as a main component and Ni as an auxiliary component into the electric arc furnace before tapping the raw molten iron.
S4, slagging off the original liquid iron in S3, adding an inoculant into the slagging-off original liquid iron, pouring the original liquid iron into a pouring cup after primary inoculation is completed, adding a sulfur-oxygen inoculant into the pouring cup for secondary inoculation, spreading perlite on the original liquid iron again for slagging off to purify the original liquid iron and immediately slagging off after the secondary inoculation is completed, and standing the original liquid iron in the pouring cup for a period of time to obtain the final casting liquid iron.
And S5, pouring the casting melt into the casting mold, wherein the pouring temperature is 1400 ℃, pouring is carried out according to the principle of high-temperature tapping and low-temperature pouring, and meanwhile, slow pouring is carried out at the beginning of the pouring process, then fast pouring is carried out, slow pouring is carried out before the fast pouring is finished, the slow pouring is carried out according to the principle of slow, fast and slow, and the pouring time is kept between 60 and 100S.
S6, after pouring, carrying out heat preservation molding, cooling, taking out the casting to obtain a bent pipe rough blank, then carrying out water toughening treatment on the bent pipe rough blank, firstly heating the bent pipe rough blank to 1050-.
And S7, inspecting and processing the obtained semi-finished product, cleaning a foreign matter removing core on the surface of the semi-finished product, cutting off a casting head, polishing the surface of the semi-finished product to obtain a finished product, and inspecting and warehousing the finished product.
The time for the first inoculation in S4 is kept at 100-300S, and the time for the second inoculation is kept at 50-65S.
The speed of rapid casting in S5 is 2 Kg/S.
The flux in S3 may be one of limestone or fluorite.
Comparative example 1:
the manufacturing process of the eccentric cast wear-resistant bent pipe according to the comparative example is the same as that of example 1, except that the casting temperature of the cast melt in step S5 is 1380, and the rest is the same as that of example 1.
Comparative example 2:
the manufacturing process of the eccentric cast wear-resistant bent pipe according to the comparative example is the same as that of example 1, except that the casting temperature of the cast melt in step S5 is 1350, and the rest is the same as that of example 1.
From the above example the following table can be obtained:
| casting temperature | δ(％) | Grain size | |
| Example 1 | 1450 | 4.32 | 1 |
| Example 2 | 1400 | 11 | 3 |
| Comparative example 1 | 1380 | 18 | 4 |
| Comparative example 2 | 1350 | 21.2 | 5 |
From the comparison in the table above, it can be seen that: the brittleness transition temperature of the steel is reduced along with the reduction of the pouring temperature, the pouring temperature has obvious influence on the grain size and various mechanical properties of the high manganese steel, the pouring temperature is 1450 ℃, and the ideal mechanical properties and grain size of the wear-resistant steel pipe made of the high manganese steel can be ensured.
The points to be finally explained are: although the present invention has been described in detail with reference to the general description and the specific embodiments, on the basis of the present invention, the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The preparation process of the eccentric casting wear-resistant bent pipe is characterized by comprising the following steps of:
s1, making a casting mold by using molding sand and core sand as molding materials, drying the molding sand and the core sand in a drying furnace before the casting mold, wherein the molding sand and the core sand are directly put into the drying furnace in the drying process, firstly, the molding sand and the core sand are heated at 50-60 ℃, the temperature is kept unchanged for 10min, then, the drying furnace is controlled to raise the temperature to 150-170 ℃ and keep the temperature inconvenient for 5min, finally, the molding sand and the core sand are cooled to room temperature by adopting a natural cooling mode, and then, the mold is made according to the drawing requirements;
s2, selecting casting raw materials, wherein the casting raw materials are mixed raw materials consisting of 10-20% of recycled iron, 60-75% of pig iron and 20-25% of waste steel, the used waste steel and recycled iron are cleaned before use to remove surface rust, impurities and soil, and the pig iron, the waste steel and recycled iron are required to remove surface oxidation layers before use;
s3, putting the mixed raw materials into an electric arc furnace for smelting, putting various raw materials into the bottom of the electric arc furnace layer by layer according to the principle that the raw materials are tight at the bottom and loose at the top, controlling the smelting temperature at 1550 ℃, and simultaneously adjusting chemical elements to ensure that the chemical elements comprise the following components in percentage by mass: mn: 11-14%, C: 1-1.5%, Si: 0.3-1.0 percent of the total weight of the molten iron, less than or equal to 0.1 percent of P, less than or equal to 0.05 percent of S and the balance of Fe, adding a flux in the smelting process, and adding a pretreatment agent which takes Cr as a main component and Ni as an auxiliary component into the electric arc furnace before the raw molten iron is discharged;
s4, slagging off the original liquid iron in S3, adding an inoculant into the slagging-off original liquid iron, pouring the original liquid iron into a pouring cup after primary inoculation is completed, adding a sulfur-oxygen inoculant into the pouring cup for secondary inoculation, spreading perlite on the original liquid iron again for slagging off to purify the original liquid iron and immediately slagging off after the secondary inoculation is completed, and standing the original liquid iron in the pouring cup for a period of time to obtain a final casting solution;
s5, pouring the casting melt into a casting mold, wherein the pouring temperature is 1400-1450 ℃, pouring is carried out according to the principles of high-temperature tapping and low-temperature pouring, meanwhile, slow pouring is carried out at the beginning of the pouring process, then fast pouring is carried out, slow pouring is carried out before the fast pouring is finished, the slow pouring is carried out according to the principles of slow, fast and slow, and the pouring time is kept between 60 and 100S;
s6, after pouring, carrying out heat preservation molding, cooling, taking out a casting to obtain a bent pipe rough blank, then carrying out water toughening treatment on the bent pipe rough blank, firstly heating the bent pipe rough blank to 1050-;
and S7, inspecting and processing the obtained semi-finished product, cleaning a foreign matter removing core on the surface of the semi-finished product, cutting off a casting head, polishing the surface of the semi-finished product to obtain a finished product, and inspecting and warehousing the finished product.
2. The process for preparing an eccentrically cast wear-resistant elbow pipe according to claim 1, wherein the process comprises the following steps: the time of the first inoculation in the step S4 is kept at 100-300S, and the time of the second inoculation is kept at 50-65S.
3. The process for preparing an eccentrically cast wear-resistant elbow pipe according to claim 1, wherein the process comprises the following steps: the speed of the quick casting in the S5 is 2 Kg/S.
4. The process for preparing an eccentrically cast wear-resistant elbow pipe according to claim 1, wherein the process comprises the following steps: the flux in S3 may be one of limestone or fluorite.
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| CN202011301240.7A CN112536420A (en) | 2020-11-19 | 2020-11-19 | Preparation process of eccentric casting wear-resistant bent pipe |
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| CN202011301240.7A CN112536420A (en) | 2020-11-19 | 2020-11-19 | Preparation process of eccentric casting wear-resistant bent pipe |
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