CN113512680B - Concrete conveying pipe and preparation method thereof and concrete pump truck - Google Patents

Concrete conveying pipe and preparation method thereof and concrete pump truck Download PDF

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Publication number
CN113512680B
CN113512680B CN202110687895.0A CN202110687895A CN113512680B CN 113512680 B CN113512680 B CN 113512680B CN 202110687895 A CN202110687895 A CN 202110687895A CN 113512680 B CN113512680 B CN 113512680B
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pipe
quenching
welding
concrete
double
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CN113512680A (en
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刘拼拼
李坤
李庶
廖凯
聂一彪
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Zoomlion Heavy Industry Science and Technology Co Ltd
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Zoomlion Heavy Industry Science and Technology 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/60—Aqueous agents
    • 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
    • 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
    • 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
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/024—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes
    • F16L23/026—Flanged joints the flanges being connected by members tensioned axially characterised by how the flanges are joined to, or form an extension of, the pipes by welding
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/02—Rigid pipes of metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The invention relates to the field of engineering machinery, and discloses a concrete conveying pipe and a preparation method thereof, wherein the concrete conveying pipe comprises an inner pipe, an outer pipe and a flange, wherein the inner pipe comprises the following components in percentage by weight: 0.95-1.1% of C, 0.25-0.4% of Si, 0.4-0.55% of Mn, 1.45-1.75% of Gr, 0.15-0.25% of Ni, 0.1-0.2% of Cu, 0.05-0.1% of RE and the balance of Fe. The preparation method of the concrete conveying pipe comprises the following steps: induction quenching is carried out on a double-layer pipe consisting of an inner pipe and an outer pipe, then tempering is carried out, and finally flange welding is carried out. The concrete conveying pipe prepared by the method can prolong the service life of the concrete conveying pipe and avoid cracking of the inner pipe after quenching.

Description

Concrete conveying pipe, preparation method thereof and concrete pump truck
Technical Field
The invention relates to the field of engineering machinery, in particular to a concrete conveying pipe, a preparation method thereof and a concrete pump truck.
Background
The concrete delivery pipe is a pipeline for pumping concrete to a destination by concrete pumping equipment such as a pump truck, a vehicle-mounted pump, a trailer pump and the like. In addition to large pumping pressure, the concrete itself is very complex and often contains large-particle hard sharp-angled aggregate. This requires that the concrete delivery pipe, in addition to being able to withstand the pumping pressure, also have excellent wear resistance.
Currently, concrete delivery pipes can be divided into two broad categories, single-layer pipes and double-layer pipes. The single-layer pipe forms a hardening layer with the thickness of 1-2mm on the inner side of the conveying pipe through inner wall induction quenching, and the wear-resistant effect is achieved. The single-layer conveying pipe has strong bearing capacity, but the hardening layer is thin and has low hardness, so the single-layer conveying pipe is not wear-resistant and has short service life. Double pipes are usually mechanically combined by drawing the inner and outer pipes, followed by induction quenching. The outer pipe of the double-layer pipe usually has a pressure bearing function for a low-carbon steel pipe, and the inner pipe has a wear-resisting function for medium-carbon steel. Or the inner pipe is made of high-carbon steel and high-chromium cast iron materials, integral quenching is adopted, and then simple compounding is carried out, but gaps usually exist between the inner pipe and the outer pipe in the obtained double-layer pipe. For the double-layer pipe, when the inner pipe is made of medium carbon steel, although the composite is better, the wear resistance is limited, and the service life is general; when the inner pipe is made of high-carbon steel or high-chromium cast iron, the inner pipe has poor hardness and brittleness, the inner pipe and the outer pipe are poor in compounding, the outer pipe has limited supporting effect on the inner pipe, and the inner pipe is easy to crack, so that the service life is shortened.
The high-carbon chromium steel has excellent wear resistance, and the quenching is usually carried out by integral quenching and oil cooling in production. But the integral quenching is adopted, so that the heat preservation time is long, the energy consumption is large, and the production cost is high; cooling with oil poses a fire risk and environmental pollution. During the quenching process of the thin-wall steel pipe, when the ratio of the wall thickness to the outer diameter is reduced, the cracking risk of the steel pipe is increased. In the on-line quenching production of the thin-wall steel pipe, most of the existing manufacturers adopt water as cooling liquid, but for the high-carbon bearing thin-wall steel pipe, if water is adopted as a cooling medium, the cooling speed is high, and the risk of quenching cracking is further increased.
Furthermore, from an analysis of the early failure modes of the delivery tube, it was found that the delivery tube failure was mainly concentrated in the vicinity of the orifice wear-through. The reason is that the conventional welding method is adopted, the hardness of the inner pipe near the pipe orifice can be reduced due to overlarge heat input amount in the flange welding process, and the wear resistance of the conveying pipe near the pipe orifice is reduced. And the welding power is reduced, and the problems of the flange welding infirm, the cold joint and the like can be caused by reducing the heat input quantity of the flange welding.
Disclosure of Invention
The invention aims to prolong the service life of a concrete conveying pipe and solve the problems of poor wear resistance, easiness in cracking, reduction in pipe orifice hardness and the like of the concrete conveying pipe.
The inventor of the invention finds that the carbon content and the chromium content in the inner tube material are increased, and the rare earth metal element is added into the inner tube material, so that higher hardness and wear resistance can be obtained, the structure of the inner tube material is improved, the hardenability of the inner tube material is improved, and the quenching cracking tendency is reduced. In a preferred embodiment, the induction quenching is carried out by using an aqueous solution containing alkylbenzene derivatives and chlorides, so that the inner tube material can further obtain higher hardness and wear resistance, the structure of the inner tube material can be further improved, the hardenability of the inner tube material can be improved, and the quenching cracking tendency can be reduced.
In order to achieve the above object, a first aspect of the present invention provides a concrete conveying pipe, which comprises an inner pipe, an outer pipe and a flange, wherein the inner pipe is composed of the following components by weight: 0.95-1.1% of C, 0.25-0.4% of Si, 0.4-0.55% of Mn, 1.45-1.75% of Gr, 0.15-0.25% of Ni, 0.1-0.2% of Cu, 0.05-0.1% of RE and the balance of Fe.
In a second aspect the present invention provides a method of making a concrete pipe, the method comprising: performing induction quenching on a double-layer pipe consisting of an inner pipe and an outer pipe, then tempering, and finally performing flange welding;
wherein, the inner pipe comprises the following components by weight percent: 0.95-1.1% of C, 0.25-0.4% of Si, 0.4-0.55% of Mn, 1.45-1.75% of Gr, 0.15-0.25% of Ni, 0.1-0.2% of Cu, 0.05-0.1% of RE and the balance of Fe.
The third aspect of the invention provides a concrete pump truck which comprises the concrete conveying pipe.
Through the technical scheme, the invention has the following beneficial effects:
(1) the inner tube comprises rare earth metal elements, has higher carbon content and chromium content, has better wear resistance and longer service life compared with a medium-carbon steel inner tube material, and is not easy to crack after being quenched.
(2) The induction quenching process adopted in the preferred embodiment of the invention can obviously improve the problem of quenching cracking of the inner tube, and can obtain the inner tube with uniform tissue and hardness, high hardness and good wear resistance.
(3) The tempering process adopted in the preferred embodiment of the invention can release quenching stress while maintaining the wear resistance of the steel pipe, improve the toughness and avoid cracking in the subsequent use process.
(4) According to the invention, the cold metal transition welding technology is adopted to carry out flange welding in the preferred embodiment, so that the reduction of the hardness of the flange welding line can be avoided, and the service life of the concrete conveying pipe is prolonged.
Drawings
Fig. 1 is a sectional view showing the structure of a concrete pipe according to the present invention.
Description of the reference numerals
1 flange 2 wear-resistant sleeve 3 flange weld joint 4 outer pipe 5 inner pipe
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For numerical ranges, each range between its endpoints and individual point values, and each individual point value can be combined with each other to give one or more new numerical ranges, and such numerical ranges should be construed as specifically disclosed herein.
The invention provides a concrete conveying pipe in a first aspect, which comprises an inner pipe, an outer pipe and a flange, wherein the inner pipe comprises the following components in percentage by weight: 0.95-1.1% of C, 0.25-0.4% of Si, 0.4-0.55% of Mn, 1.45-1.75% of Gr, 0.15-0.25% of Ni, 0.1-0.2% of Cu, 0.05-0.1% of RE and the balance of Fe. Further preferably, the inner tube is composed of the following components in percentage by weight: 0.97-1.05% of C, 0.31-0.37% of Si, 0.43-0.51% of Mn, 1.52-1.66% of Gr, 0.17-0.22% of Ni, 0.11-0.14% of Cu, 0.06-0.08% of RE and the balance of Fe.
According to the present invention, the kind of the rare earth element is not particularly limited, and preferably, the RE is at least one of La, Ce, Pr, Nd, and Y.
According to the present invention, preferably, the inner pipe is a seamless pipe or a welded pipe.
According to the invention, the wall thickness of the inner tube can be selected within wide limits, preferably 2-5 mm.
According to the present invention, the material of the outer tube is not particularly limited, and preferably, the outer tube is a seamless tube of a low carbon alloy steel or a welded tube of a low carbon alloy steel, wherein the carbon content in the low carbon alloy steel material is less than 0.25% by weight.
According to the invention, the wall thickness of the outer tube can be selected within wide limits, preferably 1.5-2.5 mm.
According to the invention, preferably, the flange is cast from a low carbon alloy steel material (the carbon content in the low carbon alloy steel material is less than 0.25% by weight); further preferably, the flange is cast from 20 gauge steel and/or Q345 low carbon alloy steel.
According to the invention, preferably, the concrete delivery pipe further comprises a wear-resistant sleeve.
According to the present invention, the material of the wear-resistant sleeve is not particularly limited, and may be made of, for example, a high-chromium cast iron material or a medium-carbon steel material. Preferably, the wear-resistant sleeve is cast by a high-chromium cast iron material with the Gr content of 22-28% by weight; further preferably, the wear sleeve is cast from a high chromium cast iron having a Gr content of 26% by weight.
In a second aspect the present invention provides a method of making a concrete pipe, the method comprising: performing induction quenching on a double-layer pipe consisting of an inner pipe and an outer pipe, then tempering, and finally performing flange welding;
wherein, the inner pipe comprises the following components in percentage by weight: 0.95-1.1% of C, 0.25-0.4% of Si, 0.4-0.55% of Mn, 1.45-1.75% of Gr, 0.15-0.25% of Ni, 0.1-0.2% of Cu, 0.05-0.1% of RE and the balance of Fe. Further preferably, the inner pipe consists of the following components in percentage by weight: 0.97-1.05% of C, 0.31-0.37% of Si, 0.43-0.51% of Mn, 1.52-1.66% of Gr, 0.17-0.22% of Ni, 0.11-0.14% of Cu, 0.06-0.08% of RE and the balance of Fe.
According to the present invention, the kind of the rare earth element is not particularly limited, and preferably, the RE is at least one of La, Ce, Pr, Nd, and Y.
According to the present invention, preferably, the RE is a combination of La and Ce, and further preferably, the mass ratio of La to Ce is 1: 1-2.
According to the invention, the conditions of the induction hardening can be selected within a wide range, preferably the induction hardening comprises a heating phase and a cooling phase.
According to the present invention, to further improve the hardenability of the double tube, preferably, the conditions of the heating stage include: the quenching current is 300-400A, and the quenching voltage is 450-550V; further preferably, the conditions of the heating phase include: the quenching current is 330-375A, and the quenching voltage is 475-530V.
According to the invention, preferably, in the heating stage, the double-layer pipe rotates around the axis of the induction heater to advance, the advancing speed of the double-layer pipe is 500-; further preferably, the traveling speed of the double-layer pipe is 540-590mm/min, and the rotating speed of the double-layer pipe is 160-175 r/min.
According to the present invention, in order to reduce the cracking rate of the double-layer pipe during on-line quenching, it is preferable that the quenching liquid used during the cooling stage is an aqueous solution containing an alkylbenzene derivative and a chloride.
According to the present invention, in order to further reduce the cracking rate of the double-layer pipe in on-line quenching, it is preferable that the total concentration of the alkylbenzene derivative and the chloride in the quenching liquid is 10 to 20% by weight, more preferably 12 to 16% by weight.
According to the present invention, the kind of the alkylbenzene derivative is not particularly limited as long as it is soluble in water. Preferably, the alkylbenzene derivative is alkylbenzene sulfonic acid and/or sodium alkylbenzene sulfonate; more preferably, the alkyl group in the alkylbenzene derivative is dodecyl; further preferably, the alkylbenzene sulfonic acid is dodecylbenzene sulfonic acid (CAS number 27176-87-0), and the sodium alkylbenzene sulfonate is sodium dodecylbenzene sulfonate (CAS number 25155-30-0).
According to the present invention, the kind of the chloride is not particularly limited, and preferably, the chloride is at least one of sodium chloride, zinc chloride and potassium chloride.
According to the present invention, in order to eliminate the cracking phenomenon of the double-layer pipe during on-line quenching, it is preferable that the mass ratio of the alkylbenzene derivative to the chloride is 15-25: 1; more preferably 18 to 23: 1.
according to the invention, preferably, the quenching liquid is contacted with the inner wall of the inner pipe in the cooling stage, and the flow rate of the quenching liquid is 10-20L/min, more preferably 13-17L/min. The outer wall temperature of the outer tube may be cooled to below 100 c for a defined dwell time of the cooling stage.
According to the present invention, preferably, the manner of contacting the quenching liquid with the inner wall of the inner pipe is spraying.
According to the invention, preferably, the conditions of tempering comprise: the temperature is 100-250 ℃, and the time is 0.5-5 h; further preferably, the condition of tempering includes: the temperature is 135-150 ℃ and the time is 1.5-3 h.
According to the present invention, it is preferable that the flange welding is performed using a cold metal transition welding technique, and the conditions of the cold metal transition welding technique include: the welding current is 130-160A, the welding voltage is 9-15V, and the welding speed is 3-8 mm/s; further preferably, the conditions of the cold metal transition welding technique include: the welding current is 135-150A, the welding voltage is 10-13V, and the welding speed is 4-6 mm/s.
According to the invention, the double-layer pipe is preferably obtained by mechanically compounding the inner pipe and the outer pipe, and further preferably, the mechanical compounding is cold drawing and/or spinning.
According to the present invention, preferably, the inner pipe is a seamless pipe or a welded pipe.
According to the invention, the wall thickness of the inner tube can be selected within wide limits, preferably 2-5 mm.
According to the present invention, the material of the outer pipe is not particularly limited, and preferably, the outer pipe is a seamless pipe of low carbon alloy steel or a welded pipe of low carbon alloy steel.
According to the invention, the wall thickness of the outer tube can be selected within wide limits, preferably 1.5-2.5 mm.
According to the invention, the concrete conveying pipe is preferably also equipped with a wear-resistant sleeve.
The composition of the flange and the wear-resistant sleeve is the same as that of the flange and the wear-resistant sleeve described in the first aspect, and a description thereof will not be repeated.
The invention provides a concrete pump truck, which comprises the concrete conveying pipe.
The present invention will be described in detail below by way of examples. In the following examples of the present invention,
the flange is cast by Q345 low-carbon alloy steel.
The wear-resistant sleeve is cast by high-chromium cast iron with the Gr weight content of 26 percent.
The welding wire adopted in the flange welding process is a low-carbon steel welding wire with the diameter of 1 mm.
Example 1
This example illustrates the preparation of a concrete delivery pipe
The inner pipe comprises the following components in percentage by weight: 1.01% of C, 0.35% of Si, 0.46% of Mn, 1.58% of Gr, 0.19% of Ni, 0.12% of Cu, 0.07% of La and the balance of Fe.
The inner tube is a seamless tube with a wall thickness of 2.5mm, and the outer tube is a Q345 welded tube with a wall thickness of 2 mm.
(1) The double-layer pipe is prepared by compounding the inner pipe and the outer pipe through a cold-drawing machine, and then the double-layer pipe is subjected to induction quenching on a quenching machine tool, wherein the induction quenching comprises a heating stage and a cooling stage. In the heating stage, the quenching current is adjusted to be 355A, the quenching voltage is 510V for heating, and the double-layer pipe rotates around the axis of the quenching inductor and moves at the rotating speed of 160r/min and the moving speed of 580 mm/min. In the cooling stage, quenching liquid is adopted for cooling, the quenching liquid is sprayed along the inner wall of the inner pipe, the flow rate of the quenching liquid is 15L/min, and the outer wall of the outer pipe is cooled to be below 100 ℃ after the quenching liquid is cooled; the quenching liquid is an aqueous solution of sodium dodecyl benzene sulfonate and zinc chloride (the mass ratio of the sodium dodecyl benzene sulfonate to the zinc chloride is 20: 1), and the concentration of the quenching liquid is 13 wt%.
(2) And (3) putting the quenched double-layer pipe into a tempering furnace for tempering, wherein the tempering temperature is 150 ℃, and the tempering time is 2 hours. The cooling mode is furnace cooling.
(3) Firstly, the wear-resistant sleeve and the flange are assembled through hydraulic pressure, and then the flange assembled with the wear-resistant sleeve is welded on the outer pipe to obtain the concrete conveying pipe. The flange welding is carried out by adopting a cold metal transition welding technology, the welding current is 140A, the welding voltage is 12V, and the welding speed is 5 mm/s.
Example 2
This example illustrates the preparation of a concrete delivery pipe
The inner pipe comprises the following components in percentage by weight: 0.95% of C, 0.25% of Si, 0.4% of Mn, 1.45% of Gr, 0.15% of Ni, 0.1% of Cu, 0.05% of Ce and the balance of Fe.
The inner tube is a seamless tube with a wall thickness of 2.5mm, and the outer tube is a Q345 welded tube with a wall thickness of 2 mm.
(1) The double-layer pipe is prepared by compounding the inner pipe and the outer pipe through a cold-drawing machine, and then the double-layer pipe is subjected to induction quenching on a quenching machine tool, wherein the induction quenching comprises a heating stage and a cooling stage. In the heating stage, the quenching current is adjusted to be 300A, the quenching voltage is 450V, the heating is carried out, the double-layer pipe rotates around the axis of the quenching inductor, the rotating speed is 150r/min, and the advancing speed is 500 mm/min. In the cooling stage, quenching liquid is adopted for cooling, the quenching liquid is sprayed along the inner wall of the inner pipe, the flow rate of the quenching liquid is 10L/min, and the outer wall of the outer pipe is cooled to be below 100 ℃ after the quenching liquid is cooled; the quenching liquid is an aqueous solution of dodecylbenzene sulfonic acid and sodium chloride (the mass ratio of the dodecylbenzene sulfonic acid to the sodium chloride is 15: 1), and the concentration of the quenching liquid is 10 wt%.
(2) And (3) putting the quenched double-layer pipe into a tempering furnace for tempering, wherein the tempering temperature is 100 ℃, and the tempering time is 5 hours. The cooling mode is furnace cooling.
(3) Firstly, the wear-resistant sleeve and the flange are assembled through hydraulic pressure, and then the flange assembled with the wear-resistant sleeve is welded on the outer pipe to obtain the concrete conveying pipe. The flange welding adopts a cold metal transition welding technology to carry out flange welding, the welding current is 130A, the welding voltage is 9V, and the welding speed is 3 mm/s.
Example 3
This example illustrates the preparation of a concrete delivery pipe
The inner pipe comprises the following components in percentage by weight: the content of C was 1.1%, the content of Si was 0.4%, the content of Mn was 0.55%, the content of Gr was 1.75%, the content of Ni was 0.25%, the content of Cu was 0.2%, the content of Ce and La was 0.1% (the mass ratio of La to Ce was 1: 1), and the balance was Fe.
The inner tube is a seamless tube with a wall thickness of 2.5mm, and the outer tube is a Q345 welded tube with a wall thickness of 2 mm.
(1) The method comprises the following steps of combining an inner pipe and an outer pipe through a cold-drawing machine to obtain a double-layer pipe, and then carrying out induction quenching on the double-layer pipe on a quenching machine tool, wherein the induction quenching comprises a heating stage and a cooling stage. In the heating stage, the quenching current is adjusted to be 400A, the quenching voltage is adjusted to be 550V for heating, the double-layer pipe rotates around the axis of the quenching inductor to advance, the rotating speed is 200r/min, and the advancing speed is 600 mm/min. In the cooling stage, quenching liquid is adopted for cooling, the quenching liquid is sprayed along the inner wall of the inner pipe, the flow rate of the quenching liquid is 20L/min, and the outer wall of the outer pipe is cooled to be below 100 ℃ after the quenching liquid is cooled; the quenching liquid is an aqueous solution of dodecyl benzene sulfonic acid and zinc chloride (the mass ratio of the dodecyl benzene sulfonic acid to the zinc chloride is 25: 1), and the concentration of the quenching liquid is 20 wt%.
(2) And (3) putting the quenched double-layer pipe into a tempering furnace for tempering, wherein the tempering temperature is 250 ℃, and the tempering time is 0.5 h. The cooling mode is furnace cooling.
(3) Firstly, the wear-resistant sleeve and the flange are assembled through hydraulic pressure, and then the flange assembled with the wear-resistant sleeve is welded on the outer pipe to obtain the concrete conveying pipe. The flange welding adopts a cold metal transition welding technology to carry out flange welding, the welding current is 160A, the welding voltage is 15V, and the welding speed is 8 mm/s.
Example 4
This example illustrates the preparation of a concrete delivery pipe
The inner pipe comprises the following components in percentage by weight: 0.97% of C, 0.31% of Si, 0.43% of Mn, 1.52% of Gr, 0.17% of Ni, 0.11% of Cu, 0.06% of La and the balance of Fe.
The inner tube is a seamless tube with a wall thickness of 2.5mm, and the outer tube is a Q345 welded tube with a wall thickness of 2 mm.
(1) The double-layer pipe is prepared by compounding the inner pipe and the outer pipe through a cold-drawing machine, and then the double-layer pipe is subjected to induction quenching on a quenching machine tool, wherein the induction quenching comprises a heating stage and a cooling stage. In the heating stage, the quenching current is adjusted to be 330A, the quenching voltage is 475V, heating is carried out, the double-layer pipe rotates around the axis of the quenching inductor to advance, the rotating speed is 160r/min, and the advancing speed is 540 mm/min. In the cooling stage, quenching liquid is adopted for cooling, the quenching liquid is sprayed along the inner wall of the inner pipe, the flow rate of the quenching liquid is 13L/min, and after the quenching liquid is cooled, the temperature of the outer wall of the outer pipe is cooled to be below 100 ℃; the quenching liquid is an aqueous solution of sodium dodecyl benzene sulfonate and zinc chloride (the mass ratio of the sodium dodecyl benzene sulfonate to the zinc chloride is 18: 1), and the concentration of the quenching liquid is 12 wt%.
(2) And (3) putting the quenched double-layer pipe into a tempering furnace for tempering, wherein the tempering temperature is 130 ℃, and the tempering time is 3 hours. The cooling mode is furnace cooling.
(3) Firstly, the wear-resistant sleeve and the flange are assembled through hydraulic pressure, and then the flange assembled with the wear-resistant sleeve is welded on the outer pipe to obtain the concrete conveying pipe. The flange welding adopts a cold metal transition welding technology to carry out flange welding, the welding current is 135A, the welding voltage is 10V, and the welding speed is 4 mm/s.
Example 5
This example illustrates the preparation of a concrete delivery pipe
The inner pipe comprises the following components in percentage by weight: the content of C was 1.05%, the content of Si was 0.37%, the content of Mn was 0.51%, the content of Gr was 1.66%, the content of Ni was 0.22%, the content of Cu was 0.14%, the content of La was 0.08%, and the balance was Fe.
The inner tube is a seamless tube with a wall thickness of 2.5mm, and the outer tube is a Q345 welded tube with a wall thickness of 2 mm.
(1) The double-layer pipe is prepared by compounding the inner pipe and the outer pipe through a cold-drawing machine, and then the double-layer pipe is subjected to induction quenching on a quenching machine tool, wherein the induction quenching comprises a heating stage and a cooling stage. In the heating stage, the quenching current is adjusted to 375A, the quenching voltage is 530V for heating, and the double-layer pipe rotates around the axis of the quenching inductor and advances at 175r/min and 590 mm/min. In the cooling stage, quenching liquid is adopted for cooling, the quenching liquid is sprayed along the inner wall of the inner pipe, the flow rate of the quenching liquid is 17L/min, and after the quenching liquid is cooled, the temperature of the outer wall of the outer pipe is cooled to be below 100 ℃; the quenching liquid is an aqueous solution of sodium dodecyl benzene sulfonate and zinc chloride (the mass ratio of the sodium dodecyl benzene sulfonate to the zinc chloride is 23: 1), and the concentration of the quenching liquid is 16 wt%.
(2) And (3) putting the quenched double-layer pipe into a tempering furnace for tempering, wherein the tempering temperature is 210 ℃, and the tempering time is 1.5 h. The cooling mode is furnace cooling.
(3) Firstly, the wear-resistant sleeve and the flange are assembled through hydraulic pressure, and then the flange assembled with the wear-resistant sleeve is welded on the outer pipe to obtain the concrete conveying pipe. The flange welding adopts a cold metal transition welding technology to carry out flange welding, the welding current is 150A, the welding voltage is 13V, and the welding speed is 6 mm/s.
Example 6
The concrete duct was prepared according to the method of example 1, except that La was replaced by Sc of equal mass.
Example 7
The concrete conveying pipe was produced in the same manner as in example 1, except that the concentration of the quenching liquid was 30% by weight.
Example 8
The concrete pipe was prepared according to the method of example 1 except that sodium dodecylbenzenesulfonate was replaced with polyacrylamide.
Example 9
The concrete transporting pipe was manufactured in the same manner as in example 1, except that in the heating stage, the quenching current was adjusted to 410A and the quenching voltage was adjusted to 560V for heating, and the double-walled pipe was rotated around the axis of the quenching inductor at a rotation speed of 140r/min and at a speed of 450 mm/min.
Example 10
The concrete ducts were prepared according to the method of example 1, except that the tempering temperature was 270 ℃ and the tempering time was 2 hours.
Example 11
The concrete duct was prepared as in example 1, except that the quenching liquid was replaced with water.
Example 12
The concrete ducts were prepared as in example 1, except that the flange welding was performed by argon gas shield welding.
Comparative example 1
The concrete duct was prepared according to the method of example 1, except that La was replaced with Cu of equal weight.
Comparative example 2
Concrete ducts were prepared according to the method of example 1, except that "the content of C was 0.88% and the content of Si was 0.48%".
Comparative example 3
Concrete ducts were prepared according to the method of example 1 except that "the content of Mn was 1.11% and the content of Gr was 0.93%".
Comparative example 4
The concrete duct was prepared according to the method of example 1 except that the tempering process of step (2) was not included.
Test example 1
The concrete ducts prepared in the above examples and comparative examples were tested according to the following test methods, and the results are shown in table 1.
Service life
The useful life of a concrete delivery pipe is measured in terms of the amount of concrete pumped by the delivery pipe before it is installed into failure (i.e., the delivery pipe inner pipe wears through or cracks). Wherein, the service life unit is 1 ten thousand ═ 10000m 3 。
Hardness test
The test was carried out using the standard of GBT 230.1-2004.
Hardness of inner pipe at flange welding seam
The test was carried out using the standard GBT 4342-1991.
Cracking of inner pipe
The cracking conditions of the inner pipe in the preparation process and the use process of the concrete conveying pipe are respectively represented by 'A', 'B' and 'No', wherein 'A' represents cracking after quenching, 'B' represents cracking in the use process, and 'No' represents that the inner pipe does not crack after quenching and in the use process.
Impact toughness
The test was carried out using the standard GBT 229-2007.
TABLE 1
Figure BDA0003125442910000141
As can be seen from the results in Table 1, the concrete conveying pipe prepared by the method of the invention can prolong the service life of the concrete conveying pipe and avoid cracking of the inner pipe after quenching.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including various technical features being combined in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims (4)

1. A method of making a concrete pipe, comprising: performing induction quenching on a double-layer pipe consisting of an inner pipe and an outer pipe, then tempering, and finally performing flange welding;
wherein, the inner pipe comprises the following components in percentage by weight: 0.97-1.05% of C, 0.31-0.37% of Si, 0.43-0.51% of Mn, 1.52-1.66% of Cr, 0.17-0.22% of Ni, 0.11-0.14% of Cu, 0.06-0.08% of RE and the balance of Fe;
RE is La or Sc;
the induction quenching comprises a heating stage and a cooling stage, and the conditions of the heating stage comprise: the quenching current is 330-375A, and the quenching voltage is 475-530V; the quenching liquid adopted in the cooling stage process is an aqueous solution containing alkylbenzene derivatives and chlorides;
the total concentration of alkylbenzene derivatives and chlorides in the quenching liquid is 12-16 wt%;
the mass ratio of the alkylbenzene derivative to the chloride is 18-23: 1;
the alkylbenzene derivative is alkylbenzene sulfonic acid and/or sodium alkylbenzene sulfonate;
the chloride is at least one of sodium chloride, zinc chloride and potassium chloride.
2. The method as claimed in claim 1, wherein, in the heating stage, the double-layer tube rotationally advances around the axis of the induction heater, the advancing speed of the double-layer tube is 500-600mm/min, and the rotating speed of the double-layer tube is 150-200 r/min;
and/or, in the cooling stage, the quenching liquid is contacted with the inner wall of the inner pipe, and the flow rate of the quenching liquid is 10-20L/min.
3. The method of claim 1, wherein the condition of tempering comprises: the temperature is 100 ℃ and 250 ℃, and the time is 0.5-5 h;
and/or performing flange welding by adopting a cold metal transition welding technology, wherein the conditions of the cold metal transition welding technology comprise: the welding current is 130-160A, the welding voltage is 9-15V, and the welding speed is 3-8 mm/s.
4. A concrete pump truck characterized by comprising a concrete conveying pipe prepared by the method of any one of claims 1 to 3.
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