CN115109890A - Bimetal composite three-way pipe and processing technology thereof - Google Patents

Bimetal composite three-way pipe and processing technology thereof Download PDF

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Publication number
CN115109890A
CN115109890A CN202210323310.1A CN202210323310A CN115109890A CN 115109890 A CN115109890 A CN 115109890A CN 202210323310 A CN202210323310 A CN 202210323310A CN 115109890 A CN115109890 A CN 115109890A
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composite
treatment
percent
way pipe
rare earth
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CN115109890B (en
Inventor
刘叶佳
张强
陈洋铭
程凯
周秋华
胡晨飞
王佳
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Jiangsu Longshan Pipe Fittings Co ltd
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Jiangsu Longshan Pipe Fittings Co ltd
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    • 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
    • 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
    • C21C7/0025—Adding carbon material
    • 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
    • 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
    • C21C7/064—Dephosphorising; Desulfurising
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
    • C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • 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
    • 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
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C23G1/081—Iron or steel solutions containing H2SO4
    • 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

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Abstract

The invention discloses a bimetal composite three-way pipe, and particularly relates to the technical field of flange bolts, which comprises the following raw materials: carbon, phosphorus, chromium, nickel, molybdenum, titanium, vanadium, copper, a composite rare earth element, niobium, tungsten, boron, sulfur, and the balance of iron and inevitable impurities. The composite rare earth element can isolate sulfur and phosphorus outside a grain boundary, can reduce the range of solid cooling solidification, and can increase the precipitation of niobium carbide by adding niobium and titanium, the rare earth element can increase the precipitation of niobium carbide and is in dispersion distribution, the particle size is less than 20nm, and part of the rare earth element is easy to be deviated at the grain boundary or near the grain boundary, and can generate a barrier effect on the migration of the grain boundary, so that the dynamic recrystallization activation energy of the material is improved, the dynamic recrystallization can be inhibited, the hardness and the wear resistance of the composite three-way pipe can be improved by tungsten and chromium, and the stability and the wear resistance of the material can be improved by the interaction of a tungsten matrix and the grain boundary, dislocation and cavity during processing by the rare earth element.

Description

Bimetal composite three-way pipe and processing technology thereof
Technical Field
The invention relates to the technical field of three-way pipes, in particular to a bimetal composite three-way pipe and a processing technology thereof.
Background
As the name implies, a pipe joint with three openings is called a three-way pipe. The three-way pipe is widely used in pipe networks for conveying liquid and gas. Because of the different conveying media, the material of three-way pipe divide into: the three-way pipe is a basic element widely applied to petrochemical, electric power, machinery, building, light industry and other departments, and is used when a branch pipeline is additionally arranged in the middle of the pipeline; secondly, in order to ensure that the air permeability of the ceramic water pipeline buried underground is good, a section of three-way pipe is additionally arranged in the middle of the pipeline at a certain distance, a T-shaped pipe orifice is upwards, and a cobble or a pottery jar is covered on the pipe orifice for protection, and the two processes of liquid filling cold extrusion bulging and hot press molding are generally adopted for processing at present.
In practical engineering application, the pipe fitting is an important component of a pipeline system, and the composite bimetal three-way pipe fitting is a special pipe fitting and plays an important role in key parts of the pipeline system. However, the existing composite bimetal three-way pipe has insufficient mechanical properties in the use process, particularly the three-way pipe exposed outside has poor wear resistance, so that the composite bimetal three-way pipe has short service life and cannot meet the use requirements of people.
Disclosure of Invention
In order to overcome the above defects in the prior art, the embodiment of the invention provides a bimetal composite three-way pipe and a processing technology thereof, and the invention aims to solve the following problems: how to improve the wear resistance of the bimetal composite three-way pipe and improve the service life of the bimetal composite three-way pipe.
In order to achieve the purpose, the invention provides the following technical scheme: a bimetal composite three-way pipe comprises the following raw materials in percentage by weight: 0.25-0.65% of carbon, 0.005-0.015% of phosphorus, 3-10% of chromium, 0.46-0.52% of nickel, 0.2-0.4% of molybdenum, 0.6-1.0% of titanium, 0.2-0.8% of vanadium, 0.2-0.3% of copper, 0.1-0.5% of composite rare earth element, 0.05-0.15% of niobium, 0.1-0.35% of tungsten, 0.005-0.05% of boron, less than or equal to 0.05% of sulfur and the balance of iron and inevitable impurities.
In a preferred embodiment, the composition comprises the following raw materials in percentage by weight: 0.35 to 0.55 percent of carbon, 0.008 to 0.012 percent of phosphorus, 5 to 7 percent of chromium, 0.48 to 0.50 percent of nickel, 0.25 to 0.35 percent of molybdenum, 0.7 to 0.9 percent of titanium, 0.4 to 0.6 percent of vanadium, 0.24 to 0.26 percent of copper, 0.2 to 0.4 percent of composite rare earth element, 0.08 to 0.12 percent of niobium, 0.2 to 0.25 percent of tungsten, 0.02 to 0.03 percent of boron, less than or equal to 0.05 percent of sulfur and the balance of iron and inevitable impurities.
In a preferred embodiment, the composition comprises the following raw materials in percentage by weight: 0.45% of carbon, 0.001% of phosphorus, 6% of chromium, 0.48% of nickel, 0.3% of molybdenum, 0.8% of titanium, 0.5% of vanadium, 0.25% of copper, 0.3% of composite rare earth element, 0.01% of niobium, 0.23% of tungsten, 0.025% of boron, less than or equal to 0.05% of sulfur, and the balance of iron and inevitable impurities.
In a preferred embodiment, the composite rare earth element is a mixture of lanthanum, cerium, yttrium and scandium, and the weight ratio of lanthanum, cerium, yttrium and scandium is 1: (0.8-1.3): (0.5-0.8): (0.6-0.8), and the inevitable impurities are less than or equal to 0.005.
A processing technology of a bimetal composite three-way pipe comprises the following specific preparation steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, introducing the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, introducing low current into the intermediate frequency furnace, heating to 1300-1400 ℃ at the heating rate of 8-10 ℃/min, heating to 1500-1600 ℃ at the heating rate of 6-9 ℃/min with full load current, precipitating and deoxidizing a deoxidizer after the ingredients in the intermediate frequency furnace are melted, adding a carburant, and then carrying out slag skimming treatment to obtain a base material;
step two: transferring the base material melted in the step one into a refining furnace, continuing to keep the temperature at 1500-;
step three: injecting the mixed casting liquid obtained in the step two into a tubular mold for casting, cooling and molding after casting, and demolding to obtain a prefabricated steel pipe;
step four: placing the prefabricated steel pipe obtained in the third step into a heat treatment furnace for heat treatment for 2-4h at 480 ℃ of 420-;
step five: placing the prefabricated steel pipe treated in the fourth step on an induction quenching machine tool for quenching treatment, and carrying out acid pickling treatment after quenching treatment;
step six: smearing a lubricant on the surface of the prefabricated steel pipe after acid cleaning, then placing the prefabricated steel pipe into a resistance furnace to be heated to 650 plus 700 ℃, preserving heat for 10-16min, and then placing the prefabricated steel pipe into an ECAE (electron cyclotron resonance AE) mold to be subjected to equal-diameter angular pressure treatment for 2-4 times;
step seven: and (5) homogenizing the materials treated in the sixth step, and then performing aging treatment to obtain the bimetal composite three-way pipe.
In a preferred embodiment, the low current control output power in the first step is 900-1000KW, the full load current control output power is 2200-2600KW, the deoxidizer in the first step is a ferrosilicon alloy, and the recarburizing agent is a graphite-based recarburizing agent.
In a preferred embodiment, in the third step, the tubular mold is preheated before being poured, the preheating time is 70-90 ℃, the preheating time is 20-30min, after the preheating, a release agent is sprayed on the surface of the tubular mold, and the cooling temperature during the cooling and forming in the third step is 4-8 ℃, and the tubular mold is cooled to room temperature.
In a preferred embodiment, the induction quenching machine tool in the fifth step heats the prefabricated steel pipe to 380 ℃ at 340-.
In a preferred embodiment, the temperature for the homogenization treatment in the seventh step is 480-620 ℃, and the time for the homogenization treatment is 3-4 h.
In a preferred embodiment, the temperature of the aging treatment in the seventh step is 320-.
The invention has the technical effects and advantages that:
1. the bimetal composite three-way pipe prepared by the raw material formula of the invention is added with chromium, nickel, molybdenum, titanium, vanadium, niobium, copper, tungsten and composite rare earth elements, wherein the nickel and the niobium not only can improve the strength of the composite three-way pipe, but also have better corrosion resistance effect on acid and alkali in the atmosphere, can prevent intergranular corrosion, the molybdenum, the titanium, the boron and the vanadium can refine crystal grains in the alloy, so that the internal structure of the alloy is compact, the mechanical property of the composite three-way pipe can be improved, the composite rare earth elements can isolate sulfur and phosphorus outside a grain boundary, the range of solid cooling solidification can be reduced, the refinement of a casting structure is realized, the solubility of the rare earth elements is realized by adding the niobium and the titanium, the rare earth elements can increase the precipitation of niobium carbide, the niobium carbide is in dispersion distribution, the particles are smaller than 20nm, and part of the rare earth elements are easy to segregate at the grain boundary or near the grain boundary, the migration of the grain boundary is hindered, so that the dynamic recrystallization activation energy of the material is improved, the dynamic recrystallization can be inhibited, tungsten and chromium can improve the hardness and the wear resistance of the composite three-way pipe, and the rare earth elements can enable the interaction of a tungsten matrix and the grain boundary, dislocation and cavity during processing to improve the stability and the wear resistance of the material;
2. the invention carries out heat treatment, quenching treatment, equal channel angular pressing treatment, acid washing treatment, homogenization treatment and aging treatment on the formed precast steel pipe, and the quenching treatment adopts an induction quenching technology, so that the material is more uniform in quenching, the equal channel angular pressing treatment can effectively improve the deformation resistance and the wear resistance of the material, and the service life is longer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1:
the invention provides a bimetal composite three-way pipe which comprises the following raw materials in percentage by weight: 0.25% of carbon, 0.005% of phosphorus, 3% of chromium, 0.46% of nickel, 0.2% of molybdenum, 0.6% of titanium, 0.2% of vanadium, 0.2% of copper, 0.1% of composite rare earth element, 0.05% of niobium, 0.1% of tungsten, 0.005% of boron, less than or equal to 0.05% of sulfur and the balance of iron and inevitable impurities.
In a preferred embodiment, the composite rare earth element is a mixture of lanthanum, cerium, yttrium and scandium, and the weight ratio of lanthanum, cerium, yttrium and scandium is 1: 1: 0.7: 0.7, and the inevitable impurities are less than or equal to 0.005.
A processing technology of a bimetal composite three-way pipe comprises the following specific preparation steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, introducing the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, introducing low current into the intermediate frequency furnace, heating to 1350 ℃ at a heating rate of 9 ℃/min, heating to 1550 ℃ at a heating rate of 8 ℃/min with full load current, mixing materials in the intermediate frequency furnace, melting, deoxidizing, precipitating, deoxidizing, adding a carburant, and then removing slag to obtain a base material;
step two: transferring the base material melted in the step one into a refining furnace, keeping the temperature at 1550 ℃, carrying out deoxidation and desulfurization treatment, uniformly mixing the weighed carbon, phosphorus, chromium, nickel, molybdenum, titanium, vanadium, niobium, copper, tungsten and boron, adding the mixture into the refining furnace for melting and mixing, adding the weighed composite rare earth elements after the melting and mixing are finished, continuously melting and mixing, and then sampling to measure the percentage content of each element to obtain a mixed casting solution;
step three: injecting the mixed casting liquid obtained in the step two into a tubular mold for casting, cooling and molding after casting, and demolding to obtain a prefabricated steel pipe;
step four: placing the prefabricated steel pipe obtained in the third step into a heat treatment furnace for heat treatment at 450 ℃ for 3h, then heating to 580 ℃ for heat treatment for 4h, and continuing heating to 630 ℃ for heat treatment for 3 h;
step five: placing the prefabricated steel pipe treated in the fourth step on an induction quenching machine tool for quenching treatment, and performing acid pickling treatment after quenching treatment is completed;
step six: smearing a lubricant on the surface of the pickled prefabricated steel pipe, then putting the prefabricated steel pipe into a resistance furnace to be heated to 680 ℃, preserving heat for 15min, and then putting the prefabricated steel pipe into an ECAE (equal channel angular compression) die to be processed for 3 times;
step seven: and (5) homogenizing the materials treated in the sixth step, and then performing aging treatment to obtain the bimetal composite three-way pipe.
In a preferred embodiment, the output power is controlled to 950KW at a low current in the first step, the output power is controlled to 2400KW at a full load current, the deoxidizer is ferrosilicon alloy in the first step, and the recarburizer is graphite-based recarburizer.
In a preferred embodiment, the tube-making mold in the third step is preheated before being poured, the preheating time is 80 ℃ and 25min, the release agent is sprayed on the surface of the tube-making mold after the preheating is completed, and the cooling temperature is 6 ℃ during the cooling forming in the third step and the tube-making mold is cooled to room temperature.
In a preferred embodiment, the induction quenching machine tool in the fifth step heats the prefabricated steel pipe to 360 ℃ by means of electromagnetic induction heating, keeps the temperature for 50min, cools the prefabricated steel pipe to 130 ℃, heats the prefabricated steel pipe to 380 ℃ by means of electromagnetic induction heating again, and during the acid pickling treatment in the fifth step, the prefabricated steel pipe is firstly soaked in a calcium hydroxide solution at 53 ℃ for 8min, then is washed by water, and is placed in a potassium hydrogen sulfate solution to be soaked at room temperature for 4min after the washing is finished.
In a preferred embodiment, the temperature for the homogenization in the seventh step is 550 ℃, and the time for the homogenization is 3.5 h.
In a preferred embodiment, the temperature for aging treatment in the seventh step is 340 ℃, the treatment time is 8h, and air cooling is performed to room temperature after aging treatment.
Example 2:
different from the embodiment 1, the bimetal composite three-way pipe comprises the following raw materials in percentage by weight: 0.45% of carbon, 0.001% of phosphorus, 6% of chromium, 0.48% of nickel, 0.3% of molybdenum, 0.8% of titanium, 0.5% of vanadium, 0.25% of copper, 0.3% of composite rare earth element, 0.01% of niobium, 0.23% of tungsten, 0.02-0.03% of boron, less than or equal to 0.05% of sulfur and the balance of iron and inevitable impurities.
Example 3:
different from the embodiments 1-2, the bimetal composite three-way pipe comprises the following raw materials in percentage by weight: 0.65% of carbon, 0.015% of phosphorus, 10% of chromium, 0.52% of nickel, 0.4% of molybdenum, 1.0% of titanium, 0.8% of vanadium, 0.3% of copper, 0.5% of composite rare earth element, 0.15% of niobium, 0.35% of tungsten, 0.05% of boron, less than or equal to 0.05% of sulfur and the balance of iron and inevitable impurities.
Example 4:
the invention provides a bimetal composite three-way pipe which comprises the following raw materials in percentage by weight: 0.25% of carbon, 0.005% of phosphorus, 3% of chromium, 0.46% of nickel, 0.2% of molybdenum, 0.6% of titanium, 0.2% of vanadium, 0.2% of copper, 0.05% of niobium, 0.1% of tungsten, 0.005% of boron, less than or equal to 0.05% of sulfur, and the balance of iron and inevitable impurities.
In a preferred embodiment, the unavoidable impurities are 0.005 or less.
A processing technology of a bimetal composite three-way pipe comprises the following specific preparation steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, introducing the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, introducing low current into the intermediate frequency furnace, heating to 1350 ℃ at a heating rate of 9 ℃/min, heating to 1550 ℃ at a heating rate of 8 ℃/min with full load current, mixing materials in the intermediate frequency furnace, melting, deoxidizing, precipitating, deoxidizing, adding a carburant, and then removing slag to obtain a base material;
step two: transferring the base material melted in the first step into a refining furnace, keeping the temperature at 1550 ℃, carrying out deoxidation and desulfurization treatment, uniformly mixing the weighed carbon, phosphorus, chromium, nickel, molybdenum, titanium, vanadium, niobium, copper, tungsten and boron, adding the mixture into the refining furnace, carrying out melting mixing, sampling and measuring the percentage content of each element after the melting mixing is finished, and obtaining a mixed casting solution;
step three: injecting the mixed casting liquid obtained in the step two into a tubular mold for casting, cooling and molding after casting, and demolding to obtain a prefabricated steel pipe;
step four: placing the prefabricated steel pipe obtained in the third step into a heat treatment furnace for heat treatment at 450 ℃ for 3h, then heating to 580 ℃ for heat treatment for 4h, and continuing heating to 630 ℃ for heat treatment for 3 h;
step five: placing the prefabricated steel pipe treated in the fourth step on an induction quenching machine tool for quenching treatment, and carrying out acid pickling treatment after quenching treatment;
step six: smearing a lubricant on the surface of the pickled prefabricated steel pipe, then putting the prefabricated steel pipe into a resistance furnace to be heated to 680 ℃, preserving heat for 15min, and then putting the prefabricated steel pipe into an ECAE (equal channel angular compression) die to be processed for 3 times;
step seven: and (5) homogenizing the materials treated in the sixth step, and then performing aging treatment to obtain the bimetal composite three-way pipe.
In a preferred embodiment, the output power is controlled to 950KW at a low current in the first step, the output power is controlled to 2400KW at a full load current, the deoxidizer is ferrosilicon alloy in the first step, and the recarburizer is graphite-based recarburizer.
In a preferred embodiment, the tube-making mold in the third step is preheated before being poured, the preheating time is 80 ℃ and 25min, the release agent is sprayed on the surface of the tube-making mold after the preheating is completed, and the cooling temperature is 6 ℃ during the cooling forming in the third step and the tube-making mold is cooled to room temperature.
In a preferred embodiment, the induction quenching machine tool in the fifth step heats the prefabricated steel pipe to 360 ℃ by means of electromagnetic induction heating, keeps the temperature for 50min, cools the prefabricated steel pipe to 130 ℃, heats the prefabricated steel pipe to 380 ℃ by means of electromagnetic induction heating again, and during the acid pickling treatment in the fifth step, the prefabricated steel pipe is firstly soaked in a calcium hydroxide solution at 53 ℃ for 8min, then is washed by water, and is placed in a potassium hydrogen sulfate solution to be soaked at room temperature for 4min after the washing is finished.
In a preferred embodiment, the temperature for the homogenization in the seventh step is 550 ℃, and the time for the homogenization is 3.5 h.
In a preferred embodiment, the temperature for the aging treatment in the seventh step is 340 ℃, the treatment time is 8 hours, and air cooling is performed to room temperature after the aging treatment.
Example 5:
the invention provides a bimetal composite three-way pipe which comprises the following raw materials in percentage by weight: 0.25% of carbon, 0.005% of phosphorus, 3% of chromium, 0.46% of nickel, 0.2% of molybdenum, 0.6% of titanium, 0.2% of vanadium, 0.2% of copper, 0.1% of composite rare earth element, 0.05% of niobium, 0.1% of tungsten, 0.005% of boron, less than or equal to 0.05% of sulfur and the balance of iron and inevitable impurities.
In a preferred embodiment, the composite rare earth element is a mixture of lanthanum, cerium, yttrium and scandium, and the weight ratio of lanthanum, cerium, yttrium and scandium is 1: 1: 0.7: 0.7, and the inevitable impurities are less than or equal to 0.005.
A processing technology of a bimetal composite three-way pipe comprises the following specific preparation steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, introducing the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, then introducing low current into the intermediate frequency furnace, heating to 1350 ℃ at a heating rate of 9 ℃/min, then heating to 1550 ℃ at a heating rate of 8 ℃/min with full load current, mixing materials in the intermediate frequency furnace, melting, then deoxidizing, precipitating and deoxidizing, adding a carburant, and then carrying out slag removing treatment to obtain a base material;
step two: transferring the base material melted in the step one into a refining furnace, keeping the temperature at 1550 ℃, carrying out deoxidation and desulfurization treatment, uniformly mixing the weighed carbon, phosphorus, chromium, nickel, molybdenum, titanium, vanadium, niobium, copper, tungsten and boron, adding the mixture into the refining furnace for melting and mixing, adding the weighed composite rare earth elements after the melting and mixing are finished, continuously melting and mixing, and then sampling to measure the percentage content of each element to obtain a mixed casting solution;
step three: injecting the mixed casting liquid obtained in the step two into a tubular mold for casting, cooling and molding after casting, and demolding to obtain a prefabricated steel pipe;
step four: placing the prefabricated steel pipe obtained in the third step into a heat treatment furnace for heat treatment at 450 ℃ for 3h, then heating to 580 ℃ for heat treatment for 4h, and continuing heating to 630 ℃ for heat treatment for 3 h;
step five: placing the prefabricated steel pipe treated in the fourth step on an induction quenching machine tool for quenching treatment, and carrying out acid pickling treatment after quenching treatment;
step six: and (5) homogenizing the materials treated in the fifth step, and then performing aging treatment to obtain the bimetal composite three-way pipe.
In a preferred embodiment, the output power is controlled to 950KW at a low current in the first step, the output power is controlled to 2400KW at a full load current, the deoxidizer is ferrosilicon alloy in the first step, and the recarburizer is graphite-based recarburizer.
In a preferred embodiment, the tube-making mold in the third step is preheated before being poured, the preheating time is 80 ℃ and 25min, the release agent is sprayed on the surface of the tube-making mold after the preheating is completed, and the cooling temperature is 6 ℃ during the cooling forming in the third step and the tube-making mold is cooled to room temperature.
In a preferred embodiment, the induction quenching machine tool in the fifth step heats the prefabricated steel pipe to 360 ℃ by means of electromagnetic induction heating, keeps the temperature for 50min, cools the prefabricated steel pipe to 130 ℃, heats the prefabricated steel pipe to 380 ℃ by means of electromagnetic induction heating again, and during the acid pickling treatment in the fifth step, the prefabricated steel pipe is firstly soaked in a calcium hydroxide solution at 53 ℃ for 8min, then is washed by water, and is placed in a potassium hydrogen sulfate solution to be soaked at room temperature for 4min after the washing is finished.
In a preferred embodiment, the temperature for the homogenization in the sixth step is 550 ℃, and the time for the homogenization is 3.5 h.
In a preferred embodiment, the temperature for the aging treatment in the sixth step is 340 ℃, the treatment time is 8 hours, and air cooling is performed to room temperature after the aging treatment.
The bimetal composite three-way pipes prepared in the above examples 1 to 5 were respectively used as an experimental group 1, an experimental group 2 and an experimental group 3, the experiment groups 4 and 5 adopt a traditional double-metal composite three-way pipe (adopting carbon steel produced by Zheng Wanda heavy industry Co., Ltd.) as a control group for testing, and respectively carry out tests on the tensile strength, the yield strength and the abrasion resistance of the selected double-metal composite three-way pipe (the tensile strength and the yield strength adopt GB/T228-02, ASTME8M-08, ISO 6892 plus 2009, JISZ 2241-98 standard for testing under normal temperature, dead load and axial loading on a tensile testing machine, when in abrasion resistance testing, the product is respectively placed on an Amsler type abrasion testing machine, 245 plus 1960 load is applied to the surface of the product, the upper shaft is rotated for 200r/min, and the abrasion resistance is tested after 8 min). The test results are shown in table one:
Figure BDA0003572551150000101
watch 1
As can be seen from the table I, compared with the traditional bimetal composite three-way pipe, the bimetal composite three-way pipe produced by the invention has better tensile strength, yield strength and wear resistance, compared with the example 1, the example 4 is lack of composite rare earth elements, compared with the example 1, the tensile strength, yield strength and wear resistance of the bimetal composite three-way pipe are reduced, compared with the example 1, the example 5 is not subjected to equal-diameter angular pressure treatment, compared with the example 1, the tensile strength, yield strength and wear resistance of the bimetal composite three-way pipe are reduced, therefore, the bimetal composite three-way pipe is added with chromium, nickel, molybdenum, titanium, vanadium, niobium, copper, tungsten and composite rare earth elements, nickel and niobium not only can improve the strength of the composite three-way pipe, but also has better corrosion resistance effect on acid and alkali in the atmosphere, and can prevent intergranular corrosion, and the molybdenum, titanium, boron and vanadium can refine grains in the alloy, the internal structure of the alloy is compact, the mechanical property of the composite three-way pipe can be improved, the composite rare earth elements can isolate sulfur and phosphorus outside a grain boundary, the range of solid cooling solidification can be reduced, the refinement of a cast structure is realized, the solubility of the rare earth elements is realized by adding niobium and titanium, the niobium carbide precipitation is increased by the rare earth elements, the particles are distributed in a dispersed manner, the particles are smaller than 20nm, partial rare earth elements are easy to be partially gathered at the grain boundary or nearby the grain boundary, and the migration of the grain boundary is hindered, so that the dynamic recrystallization activation energy of the material is improved, the dynamic recrystallization can be inhibited, the hardness and the wear resistance of the composite three-way pipe can be improved by the tungsten and the chromium, and the rare earth elements can enable a tungsten matrix to interact with the grain boundary, dislocation and a cavity to improve the stability and the wear resistance of the material during processing; the invention carries out heat treatment, quenching treatment, equal channel angular pressing treatment, acid washing treatment, homogenization treatment and aging treatment on the formed precast steel pipe, and the quenching treatment adopts an induction quenching technology, so that the material is more uniform in quenching, the equal channel angular pressing treatment can effectively improve the deformation resistance and the wear resistance of the material, and the service life is longer.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.

Claims (10)

1. A bimetal composite three-way pipe is characterized in that: comprises the following raw materials in percentage by weight: 0.25-0.65% of carbon, 0.005-0.015% of phosphorus, 3-10% of chromium, 0.46-0.52% of nickel, 0.2-0.4% of molybdenum, 0.6-1.0% of titanium, 0.2-0.8% of vanadium, 0.2-0.3% of copper, 0.1-0.5% of composite rare earth element, 0.05-0.15% of niobium, 0.1-0.35% of tungsten, 0.005-0.05% of boron, less than or equal to 0.05% of sulfur and the balance of iron and inevitable impurities.
2. The bimetal composite tee of claim 1, wherein: comprises the following raw materials in percentage by weight: 0.35 to 0.55 percent of carbon, 0.008 to 0.012 percent of phosphorus, 5 to 7 percent of chromium, 0.48 to 0.50 percent of nickel, 0.25 to 0.35 percent of molybdenum, 0.7 to 0.9 percent of titanium, 0.4 to 0.6 percent of vanadium, 0.24 to 0.26 percent of copper, 0.2 to 0.4 percent of composite rare earth element, 0.08 to 0.12 percent of niobium, 0.2 to 0.25 percent of tungsten, 0.02 to 0.03 percent of boron, less than or equal to 0.05 percent of sulfur and the balance of iron and inevitable impurities.
3. The bimetal composite three-way pipe according to claim 1, characterized in that: comprises the following raw materials in percentage by weight: 0.45% of carbon, 0.001% of phosphorus, 6% of chromium, 0.48% of nickel, 0.3% of molybdenum, 0.8% of titanium, 0.5% of vanadium, 0.25% of copper, 0.3% of composite rare earth element, 0.01% of niobium, 0.23% of tungsten, 0.025% of boron, less than or equal to 0.05% of sulfur, and the balance of iron and inevitable impurities.
4. The bimetal composite tee of claim 1, wherein: the composite rare earth element is a mixture of lanthanum, cerium, yttrium and scandium, and the weight ratio of the lanthanum to the cerium to the yttrium to the scandium is 1: (0.8-1.3): (0.5-0.8): (0.6-0.8), and the inevitable impurities are less than or equal to 0.005.
5. A processing technology of a bimetal composite three-way pipe is characterized by comprising the following steps: the preparation method comprises the following specific steps:
the method comprises the following steps: weighing the raw materials according to the weight percentage, introducing the weighed scrap iron, scrap steel and scrap alloy steel into an intermediate frequency furnace, then introducing low current into the intermediate frequency furnace, heating to 1300-1400 ℃ at the heating rate of 8-10 ℃/min, then heating to 1500-1600 ℃ at the heating rate of 6-9 ℃/min with full load current, carrying out precipitation deoxidation on the materials after the materials are melted in the intermediate frequency furnace, adding a recarburizing agent, and carrying out slag skimming treatment to obtain a base material;
step two: transferring the base material melted in the first step into a refining furnace, continuing to preserve heat at 1500-1600 ℃, performing deoxidation and desulfurization treatment, uniformly mixing the weighed carbon, phosphorus, chromium, nickel, molybdenum, titanium, vanadium, niobium, copper, tungsten and boron, adding the mixture into the refining furnace for melting and mixing, adding the weighed composite rare earth elements after melting and mixing, continuing to melt and mix, and then sampling and measuring the percentage content of each element to obtain a mixed casting solution;
step three: injecting the mixed casting liquid obtained in the step two into a tubular mold for casting, cooling and molding after casting, and demolding to obtain a prefabricated steel pipe;
step four: placing the prefabricated steel pipe obtained in the third step into a heat treatment furnace for heat treatment for 2-4h at 480 ℃ of 420-;
step five: placing the prefabricated steel pipe treated in the fourth step on an induction quenching machine tool for quenching treatment, and carrying out acid pickling treatment after quenching treatment;
step six: smearing a lubricant on the surface of the prefabricated steel pipe after acid cleaning, then placing the prefabricated steel pipe into a resistance furnace to be heated to 650 plus 700 ℃, preserving heat for 10-16min, and then placing the prefabricated steel pipe into an ECAE (electron cyclotron resonance AE) mold to be subjected to equal-diameter angular pressure treatment for 2-4 times;
step seven: and (5) homogenizing the materials treated in the sixth step, and then performing aging treatment to obtain the bimetal composite three-way pipe.
6. The processing technology of the bimetal composite three-way pipe according to claim 5, characterized in that: the output power is controlled to be 900-class 1000KW by the medium-low current in the first step, the output power is controlled to be 2200-class 2600KW by the full-load current, the deoxidizer is the ferrosilicon alloy in the first step, and the recarburizing agent is a graphite-based recarburizing agent.
7. The processing technology of the bimetal composite three-way pipe according to claim 5, characterized in that: preheating the pipe-making mould in the third step for 20-30min at 70-90 ℃ before pouring, spraying a release agent on the surface of the pipe-making mould after preheating, and cooling to 4-8 ℃ during cooling and forming in the third step to room temperature.
8. The processing technology of the bimetal composite three-way pipe according to claim 5, characterized in that: and the step five induction quenching machine tool heats the prefabricated steel pipe to 340-.
9. The processing technology of the bimetal composite three-way pipe according to claim 5, characterized in that: the temperature for the homogenization treatment in the seventh step is 480-620 ℃, and the time for the homogenization treatment is 3-4 h.
10. The processing technology of the bimetal composite three-way pipe according to claim 5, characterized in that: and in the seventh step, the temperature of the aging treatment is 320-360 ℃, the treatment time is 7-10h, and the air cooling is carried out to the room temperature after the aging treatment.
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