CN116657049A - Wear-resistant seamless steel pipe for concrete pump truck and manufacturing method thereof - Google Patents
Wear-resistant seamless steel pipe for concrete pump truck and manufacturing method thereof Download PDFInfo
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- CN116657049A CN116657049A CN202310770714.XA CN202310770714A CN116657049A CN 116657049 A CN116657049 A CN 116657049A CN 202310770714 A CN202310770714 A CN 202310770714A CN 116657049 A CN116657049 A CN 116657049A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 83
- 239000010959 steel Substances 0.000 title claims abstract description 83
- 239000004567 concrete Substances 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 14
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 239000000126 substance Substances 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 abstract description 10
- 239000011159 matrix material Substances 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 20
- 230000000171 quenching effect Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000002356 single layer Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- C21D1/18—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
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- 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
- C22C38/04—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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention belongs to the technical field of seamless steel pipe production, and particularly relates to a wear-resistant seamless steel pipe for a concrete pump truck and a manufacturing method thereof, which are characterized by comprising the following chemical components in percentage by weight: 0.48 to 0.60 percent of C, 0.79 to 1.20 percent of Si, 0.20 to 0.80 percent of Mn, 0.15 to 0.50 percent of Cr, 0.05 to 0.20 percent of Ti, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, and the balance of Fe and unavoidable impurities. The steel pipe structure is a mixed structure of troostite, bainite and martensite of a hardening layer structure of the inner surface of the steel pipe, wherein the content of troostite, bainite structure is more than 55%. Yield strength > 500MPa; tensile strength is more than 800MPa; elongation after break > 16%; the longitudinal impact energy at 20 ℃ is more than 20J; the thickness of the hardening structure reaches 3.0-4.0mm, the thickness of the hardening structure can reach 60% -80% of the full wall thickness of the steel pipe, and the effective thickness of the wear-resistant layer of the wear-resistant steel pipe is greatly improved; hardness value of quench layer: HRC60-65. The beneficial effects of the invention are as follows: the wear-resistant steel pipe for the concrete pump truck can be provided with a steel pipe outer layer matrix with toughness, and a wear-resistant layer with hardness and excellent texture is provided for a steel pipe inner layer.
Description
Technical Field
The invention belongs to the technical field of seamless steel tube production, and particularly relates to a wear-resistant seamless steel tube for a concrete pump truck and a manufacturing method thereof.
Background
The pumping concrete is ready-mixed concrete which is transported along a conveying pipeline under the pressure of a concrete pump and is directly poured at the outlet of the pipeline, the conveying pipeline of the concrete pump truck is an important tool for conveying the concrete, the pipeline for conveying the concrete is developed, produced and used in recent ten years in China, the core idea is that an outer layer of steel pipe or the outer wall of the steel pipe has certain strength and toughness to bear the working pressure of conveying the concrete; the inner layer of the steel tube increases its wear resistance by a number of means, such as: 1) The single-layer wear-resistant pipe is characterized in that the inner wall of the steel pipe is subjected to structural transformation within a certain thickness range through a quenching process, and the wear resistance is increased by using a hardening layer; 2) The bimetal composite wear-resistant pipe is generally a steel pipe internally composited with an inner pipe with wear resistance, and the inner pipe is also generally a steel pipe with high hardness and poor plasticity; 3) And (3) performing overlaying welding of different materials or compounding other nonmetallic wear-resistant materials on the inner wall of the steel pipe, and the like, so that the wear resistance of the inner wall of the steel pipe is improved. The most widely used single-layer wear-resistant pipe has the advantages of low cost, strong process operability and meeting engineering requirements.
The main problems of the single-layer wear-resistant pipe are as follows: 1) The single-layer wear-resistant pipe is made of medium-high carbon steel, and the requirements of high hardness of the inner wall and toughness of the outer wall are a pair of contradictors; 2) The toughness of the hardened inner wall is poor, and cracking and falling phenomena are easy to occur in the service process, so that the steel pipe is locally ground and leaked; 3) The steel pipe matrix has higher carbon content and poorer toughness, and the hardening layer has insufficient thickness and the wear-resistant layer is thinner during the inner wall quenching processing, so that the steel pipe is not wear-resistant.
The invention provides a steel pipe with the hardness not reduced and the toughness increased, which provides good toughness for a matrix, increases the thickness of a hardening layer on the inner wall of the steel pipe, and increases the wear resistance, thus being a permanent and continuous pursuit in the industry.
Disclosure of Invention
The invention aims to provide a wear-resistant seamless steel pipe for a concrete pump truck and a manufacturing method thereof, which overcome the defects of the prior art, improve the toughness of the steel pipe under the condition that the hardness is not reduced by a reasonable heat treatment process, provide a good parent metal for a hardening structure of the inner surface of the steel pipe, ensure that the hardness of a hardening layer of the steel pipe is more than HRC60, the thickness reaches 3.0mm-4.0mm, reduce cracks on the inner surface of the steel pipe, ensure that the thickness of the hardening structure is 3.0mm-4.0mm, and meet the requirement of long-distance cement conveying of a cement pump truck.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
one of the technical proposal is as follows: the wear-resistant seamless steel pipe for the concrete pump truck is characterized by comprising the following chemical components in percentage by weight: 0.48 to 0.60 percent of C, 0.79 to 1.20 percent of Si, 0.20 to 0.80 percent of Mn, 0.15 to 0.50 percent of Cr, 0.05 to 0.20 percent of Ti, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, and the balance of Fe and unavoidable impurities.
The steel pipe structure is a mixed structure of troostite, bainite and martensite of a hardening layer structure of the inner surface of the steel pipe, and the yield strength is more than 500MPa; tensile strength is more than 800MPa; elongation after break > 16%; the longitudinal impact energy at 20 ℃ is more than 20J; the thickness of the hardening structure reaches 3.0-4.0mm, and the hardness value of the hardening layer is as follows: HRC60-65.
The second technical scheme is as follows: the manufacturing method of the wear-resistant seamless steel pipe for the concrete pump truck is characterized by comprising the following specific manufacturing processes: molten steel is smelted by a converter, refined outside the converter, vacuum treated, continuously cast and rolled to obtain a tube blank, the tube blank is heated by an annular furnace, the heating temperature is 1200-1240 ℃, and the tube blank is perforated, rolled by a tube mill and a sizing mill after being heated to be formed, so that the wear-resistant seamless steel tube for the concrete pump truck is obtained. And (3) carrying out normalizing treatment on the rolled steel pipe, wherein the normalizing temperature is 820-860 ℃. The normalized steel pipe is quenched and heat treated at 830-880 deg.c in water cooling mode, and tempered at 200-300 deg.c.
The component design principle of the invention is as follows:
c is the most economical and effective element to increase the hardness of wear resistant steel. The wear-resistant steel pipe is generally used in a quenching/quenching and tempering state, the C content is lower than 0.48%, the hardness after quenching is lower, the C content is higher than 0.60%, the plastic toughness index of the steel is rapidly reduced along with the increase of the carbon content, and the welding performance is also reduced, and the C content designed by the invention is 0.48% -0.60%.
Si has inferior hardenability to C, mn and Cr, but Si can obviously improve the strength and hardness of steel, and has better wear resistance. Si effectively increases the activity of carbon in austenite, inhibits precipitation of carbide in austenite, and thereby reduces crack initiation and propagation. When Si is in a certain range, the plasticity is not lowered. When Si is more than 1.5%, toughness of the steel is greatly reduced. Therefore, 0.79% to 1.20% is selected as the alloy content range of Si.
Mn is mainly an strengthening element and a hardenability element, strengthens a matrix, improves the hardenability of steel, but has too high Mn content, and can generate a large amount of netlike ferrite to increase the tempering brittleness of the steel. Mn content is 0.20-0.80%.
The Ti treatment can refine austenite grains, and Ti is 0.05-0.20%.
Cr can improve hardenability and form certain carbide to further improve the hardness and wear resistance of the steel.
And finally, after normalizing and quenching heat treatment, forming a mixed structure of troostite, bainite and martensite, wherein the toughness of the mixed structure is better than that of a simple martensite or martensite and troostite structure. In the quenched layer structure, troostite and bainite are taken as main materials, the content of martensite is low, the crack formation and expansion are relatively slow, and the quenched layer structure has better wear resistance.
S is a harmful element of steel grade, and too high S can affect the toughness of steel.
One of the innovative characteristics of the invention is that the method is adopted in low alloy steel, the C, mn content is controlled, the Si content is improved, and a proper amount of Ti and Cr alloying technical route is added. The steel pipe meets the strength and hardness requirements and has good toughness.
The second innovative feature of the invention is that the steel pipe reaches the required mechanical property through normalizing and quenching heat treatment, and the normalizing improves the toughness of the steel pipe matrix structure.
The invention is characterized in that according to the heat treatment process, the thickness of the hardening layer on the inner surface of the steel pipe reaches 3.0-4.0mm, and the thickness of the hardening structure can reach 60% -80% of the total wall thickness of the steel pipe.
The invention has the innovative characteristics that the mixed structure of troostite, bainite and martensite of the hardening layer structure of the inner surface of the steel pipe is mainly composed of troostite, bainite, and the troostite, the bainite structure is more than 55%.
Compared with the prior art, the invention has the beneficial effects that:
1) The yield strength of the wear-resistant seamless steel pipe reaches more than 500MPa; tensile strength is more than 800MPa; elongation after break > 16%; the longitudinal impact energy at 20 ℃ is more than 20J; hardness value of the hardening layer HRC60-65; the steel pipe structure is a mixed structure of troostite, bainite and martensite of a hardening layer structure of the inner surface of the steel pipe, can provide a tough steel pipe outer layer matrix for the wear-resistant steel pipe for the concrete pump truck, and provides a wear-resistant layer with hardness and excellent structure for the inner layer of the steel pipe.
2) Compared with the Chinese patent of CN111020370A, the invention reduces the content of martensite structure and increases the bainite structure under the same hardness, so that the steel pipe hardening layer has better wear resistance.
Detailed Description
The technical solutions of the present invention will be clearly and fully described below with reference to specific embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the embodiments that are needed in the embodiments or the prior art descriptions, and it is obvious that the embodiments in the following description are some embodiments of the present invention and that other embodiments may be obtained according to these embodiments without inventive effort for a person skilled in the art.
The components of the embodiments of the present invention generally described and illustrated in the specific embodiments herein can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as provided in the specific embodiments, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
The invention relates to a manufacturing method of a wear-resistant seamless steel pipe for a concrete pump truck, which comprises the following specific manufacturing processes: molten steel is smelted by a converter, refined outside the converter, vacuum treated, continuously cast and rolled to obtain a tube blank, the tube blank is heated by an annular furnace, the heating temperature is 1200-1240 ℃, and the tube blank is perforated after being heated and rolled and formed by a tube mill sizing mill, so that the wear-resistant seamless steel tube for the concrete pump truck is obtained. Normalizing the rolled steel pipe at 820-860 deg.c, and the steps of 825 deg.c, 845 deg.c, 830 deg.c, 855 deg.c and 835 deg.c in the examples 1-6. Carrying out quenching heat treatment on the normalized steel pipe, wherein the quenching temperature is 830-880 ℃, and 855 ℃, 840 ℃, 875 ℃, 845 and 865 ℃ are respectively selected from examples 1-6; the cooling mode is water cooling, tempering can be carried out at 200-300 ℃ after water cooling, 270 ℃, 230 ℃, 260 ℃, 245 ℃ and 280 ℃ are respectively selected in examples 1-6; finally, the finished steel pipe is obtained: the inner surface of the steel pipe is provided with a mixed structure of troostite, bainite and martensite, the thickness of the mixed structure reaches 3.0-4.0mm, and the hardness value is HRC60-65.
The composition designs of the steels of examples 1-6 and comparative examples 1-2 of the present invention are shown in Table 1. The main performance indexes of the finished products of examples 1-6 and comparative examples 1-2 of the present invention are shown in Table 2.
TABLE 1 composition design (wt%) of inventive and comparative steels
| Examples | Specification/mm | C | Si | Mn | Cr | P | S | Ti |
| 1 | Φ133*5.0 | 0.48 | 1.17 | 0.45 | 0.33 | 0.016 | 0.017 | 0.11 |
| 2 | Φ133*5.3 | 0.60 | 0.98 | 0.50 | 0.16 | 0.018 | 0.014 | 0.12 |
| 3 | Φ133*5.5 | 0.58 | 0.88 | 0.25 | 0.42 | 0.020 | 0.016 | 0.13 |
| 4 | Φ133*5.6 | 0.56 | 0.92 | 0.68 | 0.48 | 0.020 | 0.010 | 0.13 |
| 5 | Φ133*5.5 | 0.52 | 1.05 | 0.55 | 0.35 | 0.010 | 0.018 | 0.12 |
| 6 | Φ133*5.5 | 0.55 | 0.79 | 0.60 | 0.25 | 0.012 | 0.009 | 0.12 |
| Comparative example 1 | Φ133*5.5 | 0.55 | 0.25 | 0.76 | 0.40 | 0.018 | 0.010 | 0.016 |
| Comparative example 2 | Φ133*5.5 | 0.60 | 0.33 | 0.86 | 0.47 | 0.016 | 0.012 | 0.020 |
TABLE 2 mechanical Properties of the products of the invention
The inner surfaces of the finished steel pipes obtained in the examples 1-6 obtain mixed structures of troostite, bainite and martensite, the inner surfaces of the steel pipes of the comparative examples 1 and 2 obtain mixed structures of martensite and troostite, and the inner surface hardening layers of the steel pipes of the examples 1-6 are better in toughness and smaller in abrasion weight loss as shown by comparison.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The wear-resistant seamless steel pipe for the concrete pump truck is characterized by comprising the following chemical components in percentage by weight: 0.48 to 0.60 percent of C, 0.79 to 1.20 percent of Si, 0.20 to 0.80 percent of Mn, 0.15 to 0.50 percent of Cr, 0.05 to 0.20 percent of Ti, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, and the balance of Fe and unavoidable impurities.
2. The wear-resistant seamless steel tube for a concrete pump truck according to claim 1, wherein the steel tube structure is a mixed structure of troostite, bainite and martensite of a hardening layer structure of the inner surface of the steel tube, and the content of troostite, bainite structure is more than 55%; yield strength > 500MPa; tensile strength is more than 800MPa; elongation after break > 16%; longitudinal impact energy at 20 ℃): > 20J; the thickness of the hardening structure reaches 3.0-4.0mm, and the hardness value of the hardening layer is as follows: HRC60-65.
3. The manufacturing method of the wear-resistant seamless steel pipe for the concrete pump truck is characterized by comprising the following specific manufacturing processes: molten steel is smelted by a converter, refined outside the converter, vacuum treated, continuously cast and rolled to obtain a tube blank, the tube blank is heated by an annular furnace, the heating temperature is 1200-1240 ℃, and the tube blank is perforated, rolled by a tube mill and a sizing mill after being heated to be formed, so that the wear-resistant seamless steel tube for the concrete pump truck is obtained. And (3) carrying out normalizing treatment on the rolled steel pipe, wherein the normalizing temperature is 820-860 ℃. The normalized steel pipe is quenched and heat treated at 830-880 deg.c in water cooling mode, and tempered at 200-300 deg.c.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310770714.XA CN116657049A (en) | 2023-06-28 | 2023-06-28 | Wear-resistant seamless steel pipe for concrete pump truck and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310770714.XA CN116657049A (en) | 2023-06-28 | 2023-06-28 | Wear-resistant seamless steel pipe for concrete pump truck and manufacturing method thereof |
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| CN116657049A true CN116657049A (en) | 2023-08-29 |
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