CN110117751B - Wear-resistant corrosion-resistant bimetal composite pipe material and preparation method thereof - Google Patents
Wear-resistant corrosion-resistant bimetal composite pipe material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a wear-resistant corrosion-resistant bimetal composite pipe material and a preparation method thereof. When the pipe is manufactured, the inner wall of the pipe is poured, the outer surface of the inner wall is provided with a plurality of bulges, after the pipe is cooled to the low temperature or the normal temperature, the inner wall is placed into a casting mold, molten steel on the outer wall is smelted, then the outer wall of the pipe is poured, and the inner wall and the outer wall of the pipe are firmly connected together by the plurality of bulges; and after the bimetal tube blank is cast, cleaning and polishing the bimetal tube blank, and then carrying out heat treatment on the whole bimetal tube blank. The prepared bimetal composite pipe overcomes the defects of the bimetal composite pipe manufactured by the prior art and has the characteristics of low cost, good wear resistance, corrosion resistance and the like.
Description
Technical Field
The invention relates to a bimetal composite pipe material and a preparation method thereof, belonging to the technical field of metal materials and processing.
Background
The conveying pipeline plays a role in lifting the weight in the fluid transportation process of industries such as petroleum, chemical engineering, nuclear power and the like, along with the rapid development of modern industry, the factors of more and more varieties of conveyed fluid species, more and more complex use conditions and environmental media and the like also put forward higher and higher requirements on the comprehensive performance of conveying pipeline products, the traditional materials cannot meet the use conditions, the conveying pipeline made of a single material is gradually eliminated, and therefore, the bimetallic composite pipe material and the production technology thereof are rapidly developed, and the bimetallic pipeline is more and more applied.
The conventional design principle of the bimetallic pipeline is that the outer surface of the pipeline meets the allowable pressure and stress of pipeline design, and the inner surface (inner wall) of the pipeline is resistant to corrosion, abrasion and fluid scouring and the like. The bimetal composite pipe has all the characteristics of outer surface and inner wall materials, and compared with an integral carbon steel pipe or an alloy pipe, the bimetal composite pipe has the advantages that the use safety, the reliability and the service life are greatly improved compared with a single-material pipeline.
In recent years, researchers have conducted a lot of research on improving corrosion resistance, wear resistance, service life and performance of bimetal composite pipes, and several bimetal composite pipe materials and structures are developed domestically. At present, the bimetal pipeline mainly has the following technologies:
patent CN104328334A discloses a high-wear-resistance high-chromium cast iron for bimetal composite pipes and a preparation method thereof, the content of chromium (Cr) in the high-wear-resistance high-chromium cast iron is as high as 9.0-14.0%, the cost is obviously increased, and a small amount of V, Ti elements are added, so that the cost of raw materials is increased. The mechanical properties of the material are as follows: HRC: 40-50, and the impact toughness is only: 3-5 j/cm2, and obviously has low mechanical property index.
Patent CN101774010A discloses a production method of a bimetal metallurgical composite wear-resistant pipe blank, which adopts a method of pouring outer layer molten metal and then pouring inner layer molten metal to prepare a bimetal pipe. The outer layer is made of plain carbon steel or low-alloy high-strength steel material, and the inner layer is made of high-chromium white cast iron material. Because the two materials have different components, the alloy content is greatly different, and the contraction coefficients are not necessarily consistent. Therefore, it is difficult to achieve complete metallurgical fusion between the two, and a certain gap must exist between the two after the two are cooled. In addition, the process is not easy to control in actual production. The outer layer is made of plain carbon steel or low-alloy high-strength steel material, and the inner layer is made of high-chromium white cast iron material. Wherein, the high-chromium white cast iron is made of Cr26 and Cr15, and the alloy cost is high.
Patent CN201680072U discloses a "wear-resistant heat-resistant corrosion-resistant composite pipeline", which compounds high-chromium cast iron alloy and porous SiC ceramic on the inner surface of a carbon steel pipeline at high temperature by vacuum negative pressure cast infiltration process. The content of chromium (Cr) in the high-chromium cast iron used in the patent reaches 28-30%, and a fine nail is required to be adopted in advance to fix the porous SiC ceramic on the inner wall in production, so that the molten iron impact force is very large during pouring, and the SiC ceramic has the possibility of being washed away.
Patent CN101603613A discloses a "bimetal wear-resistant composite pipe", the outer wall of the invention adopts a steel pipe, the inner wall adopts an alloy, and the two are metallurgically bonded. Firstly, the inner wall alloy uses noble metals such as nickel (0.85-1.12 percent of nickel), molybdenum (1.33-1.66 percent of molybdenum) and the like, so that the cost of raw materials is increased, and relevant indexes such as mechanical property, metallographic structure appearance and the like which can be achieved by using the alloy are not disclosed in the invention.
To sum up, the outer wall of the existing bimetallic pipe is generally made of carbon steel or alloy steel, the inner wall of the existing bimetallic pipe is made of high-chromium white cast iron or high-chromium white cast iron embedded with ceramic particles, and the like, and the prepared bimetallic pipe has the following defects and shortcomings: firstly, the inner wall is made of high-chromium white cast iron, the manufacturing cost of raw materials is high, the bimetallic tube adopts liquid-liquid compounding or another metal is poured after one metal is poured and cooled to a certain temperature, the two metals are difficult to achieve metallurgical combination, a certain gap exists between the two metals, and the safety can not be ensured in the using process. Therefore, there is an urgent need to develop a bimetallic composite pipe having low cost, excellent performance and guaranteed safety.
Disclosure of Invention
The invention aims to overcome the defects and provide a wear-resistant corrosion-resistant bimetal composite pipe material and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
the wear-resistant corrosion-resistant bimetal composite pipe material adopts carbide-containing martensite wear-resistant nodular cast iron as the inner wall of a pipe, and comprises the following chemical components in percentage by weight: c: 3.5-3.8%, Si 1.9-2.3%, Mn 1-1.5%, Cr 0.1-0.3%, B: 0.02 to 0.25 percent of Cu, 0.1 to 0.28 percent of V, 0.8 to 1 percent of Mo, 0.6 to 0.8 percent of Ni, 0.8 to 1.0 percent of Cu, 0.1 to 0.3 percent of Nb, 0.05 to 0.2 percent of N, 0.02 to 0.03 percent of Ce, 0.03 to 0.05 percent of Mg, 0.03 to 0.05 percent of Re, S, P not more than 0.03 percent, the balance being Fe and impurities, and the total amount of the impurities not more than 0.06 percent;
the outer surface is made of low-alloy wear-resistant steel, and the weight percentages of chemical components are as follows: c: 0.15 to 0.35 percent of Si, 0.3 to 0.6 percent of Mn, 0.8 to 1.0 percent of Mn, 0.6 to 1.6 percent of Cr, 0.8 to 1 percent of Mo, 1 to 1.5 percent of Ni, 0.8 to 1.9 percent of Cu, 0.1 to 0.3 percent of Nb, 0.1 to 0.3 percent of N, 0.1 to 0.3 percent of Re, S, P being less than or equal to 0.03 percent, the balance being Fe and impurities, and the total amount of the impurities being less than or equal to 0.05 percent.
The preparation method of the wear-resistant corrosion-resistant bimetal composite pipe material comprises the following steps:
(1) firstly, casting an inner wall:
a. firstly, designing the thickness of an inner wall and the outer surface of the inner wall according to requirements, wherein the outer surface of the inner wall is provided with a plurality of bulges;
b. preparing raw materials according to the mass percent of the elements, and weighing the raw materials with the required weight: pig iron, scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferroboron, ferrovanadium, nickel, copper, ferroniobium, nodulizer, manganese nitride, rare earth ferrosilicon and cerium silicon carbide;
c. smelting raw materials, namely adding materials except key alloy and a nodulizer into the raw materials in a reasonable sequence and at a proper time for smelting, and tapping iron into a spheroidizing ladle when the molten iron smelting temperature reaches 1500-1550 ℃;
d. adding a key alloy and spheroidizing inoculation, smashing ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride and cerium silicon carbide into small pieces with the size of 3-5 mm in order to ensure the yield of rare elements, drying the small pieces, putting the small pieces into a casting ladle, putting a spheroidizing agent at the bottommost part of the casting ladle, putting ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride, cerium silicon carbide and an inoculant on the upper part of the spheroidizing agent, covering an iron sheet accounting for 1% of the mass of the molten iron on the uppermost part of the spheroidizing agent to prevent the spheroidizing reaction from being carried out prematurely, flushing the molten iron liquid into the spheroidizing ladle, slagging after the iron liquid reacts, and standing;
e. casting molding, namely casting the spheroidized inoculated molten iron into a casting mold, cooling and solidifying the molten iron to obtain an as-cast nodular cast iron pipe, and cleaning and polishing the as-cast nodular cast iron pipe;
(2) putting the inner wall into a casting mold, smelting outer wall molten steel, then pouring the outer wall, and firmly connecting the inner pipe wall and the outer pipe wall together by a plurality of bulges:
a. according to the integral modeling, smelting low alloy steel, putting the prepared inner wall into a casting mold, pouring low alloy steel liquid, wrapping a plurality of bulges with hot outer molten steel, according to the principle of expansion with heat and contraction with cold, after the outer molten steel is cooled, more tightly wrapping the bulges to realize seamless connection, and after cooling and forming, preparing a bimetallic tube blank; cleaning and polishing;
b. carrying out integral heat treatment on the bimetallic pipe, firstly heating and preserving heat, quenching after the heat preservation time is up, and then carrying out tempering treatment;
c. shot blasting, size and performance detection and warehousing.
In the preparation method, the charging sequence in the step (1) c is as follows: pig iron-scrap steel, part of ferroalloy-scrap steel, performing furnace front analysis after melting the scrap steel, adding an intermediate alloy, and then adjusting the components of molten steel; the key alloy is ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride and cerium silicon carbide.
And (3) controlling the temperature rise speed of the temperature rise and preservation in the step (2) b to be below 600 ℃ per hour to be 80-100 ℃, preserving the temperature for 1 hour at 300 ℃ and 600 ℃, quickly raising the temperature to 880-920 ℃ after 600 ℃, preserving the temperature, and calculating the heat preservation time according to the thickness of the bimetal wall, wherein the heat preservation time is generally 1 hour every 25 mm. The quenching liquid is 8-10% NaCl water solution or quenching liquid or quenching oil. The tempering temperature is 200-245 ℃.
The invention has the beneficial effects that:
(1) the inner wall of the bimetal composite pipe adopts a carbide martensitic ductile cast iron material. In the manufacturing process of the composite pipe inner wall material, elements such as chromium, vanadium, boron, cerium, nitrogen, niobium and the like are added to carry out micro-alloying treatment on the material, and a large number of orthogonal experiments are carried out to obtain the optimal range of the addition amount (weight percentage) of the elements: 1-1.5% of Mn, 0.1-0.3% of Cr, B: 0.02-0.25 percent of the alloy, 0.1-0.28 percent of V, 0.8-1 percent of Mo, 0.6-0.8 percent of Ni, 0.8-1.0 percent of Cu, 0.1-0.3 percent of Nb, 0.05-0.2 percent of N and 0.02-0.03 percent of Ce, and when the addition amount of the elements is in the range, the material contains martensite matrix and massive and granular dispersion distributed carbide in a metallographic structure after heat treatment, and the microstructure plays a strong role in improving the wear resistance and the corrosion resistance of the material. Meanwhile, compared with common high-chromium cast iron (the Cr is more than 15 percent generally), the alloy cost is greatly reduced, so that the material has high cost performance.
The structure determines the usability, the metallographic structure of the material of the inner wall of the bimetal composite pipe contains a certain number of independently distributed (dispersed) granular and blocky carbides, and the carbides have high hardness (HV 2400-2600), so that the inner wall of the bimetal composite pipe has good wear resistance. Because carbides are independently distributed in the structure (some carbides are in dispersion distribution), the function of cutting and cracking the matrix is reduced, and the material has good toughness. After detection and heat treatment, the mechanical property indexes of the inner wall of the pipe are as follows: HRC 59-61, impact toughness: 8 to 12j/cm2. The hardness is equivalent to that of high-chromium cast iron, and the impact toughness is 2-3 times that of the high-chromium cast iron. The macro hardness and the carbide hardness are beneficial to improving the wear resistance and the corrosivity of the material, and the toughness is beneficial to ensuring that the material is broken or cracked in the using process, so that the use reliability is improved.
In addition: the inner wall metal pipe is a martensite nodular cast iron material containing carbide after heat treatment, and the metallographic structure contains graphite spheres and a certain amount of granular and blocky carbides which are dispersedly distributed on a martensite matrix, so that the material has excellent wear resistance, and the inner wall metal pipe also has good corrosion resistance.
(2) The preparation method comprises the steps of firstly pouring the inner wall, forming a plurality of bulges on the outer surface of the inner wall, cooling to a low temperature (below 300 ℃) or a normal temperature, putting the inner wall into a casting mold, smelting molten steel on the outer wall, then pouring the outer wall, and firmly connecting the inner pipe wall and the outer pipe wall together by virtue of the plurality of bulges. The plurality of bulges are wrapped by the hot outer molten steel, and according to the principle of expansion with heat and contraction with cold, the bulges can be wrapped more tightly after the outer molten steel is cooled, so that no gap can be generated, and the method is one of the advantages superior to centrifugal casting of the bimetallic tube.
(3) After the bimetallic tube blank is cast, the bimetallic tube blank is cleaned and then is subjected to heat treatment integrally, the inner wall of the bimetallic tube blank is made of alloyed nodular cast iron, the outer wall of the bimetallic tube blank is made of low alloy steel, and the temperature ranges of quenching and tempering of the bimetallic tube blank and the low alloy steel are basically consistent through testing the heat treatment curves of the bimetallic tube blank and the low alloy steel, so that the temperature points of phase change of the bimetallic tube blank and the low alloy steel in the quenching process are basically consistent, the heat treatment is carried out at the same temperature point, the possibility of cracking or crazing in the heat treatment process is avoided, and the: the heat treatment process adopts any one of 8-10% NaCl aqueous solution, quenching liquid or quenching oil, and can achieve the final purpose, and the heat treatment process is simpler and saves energy.
In addition: the three quenching media are all liquid, namely, after the heat preservation time is up, the casting is directly put into the liquid quenching media, which is favorable for ensuring the quenching uniformity and consistency, and the mechanical property indexes of all parts of the quenched casting can be consistent. Thereby ensuring the safety and reliability of the bimetallic pipe in the using process.
The mechanical property indexes of the inner wall of the bimetallic tube after heat treatment are as follows: HRC 59-61, impact toughness: 8 to 12j/cm2(ii) a The mechanical property index of the outer wall is as follows: HRC 49-51, impact toughness: 68-80 j/cm2。
(4) According to the preparation method of the wear-resistant corrosion-resistant bimetal composite pipe material, the final metallographic structure of the carbide-containing martensite ductile cast iron prepared on the inner wall of the pipe after heat treatment is as follows: martensite + carbide + graphite nodules + a small amount of retained austenite. Wherein: the carbides are independently distributed, are in block and dispersed particle shapes, and have high hardness (HV 2400-2600).
The bimetallic tube disclosed by the invention not only has good wear resistance, but also has excellent corrosion resistance, and compared with the performance test results of a metal tube in the prior art, the results are shown in the following table. Table 1 shows the results of the combined use statistics of several media. Several comparative pipe thicknesses referred to in the table were consistent.
TABLE 1
Drawings
FIG. 1 is a schematic view of the inner and outer surfaces of a bimetal composite pipe according to the present invention;
FIG. 2 is a structural diagram of the inner wall metal material of the bimetal composite tube manufactured by the present invention.
Detailed Description
In the specific embodiment of the invention, the outer walls of the wear-resistant and corrosion-resistant bimetal composite pipe materials are made of low-alloy wear-resistant steel, and the wear-resistant and corrosion-resistant bimetal composite pipe materials comprise the following chemical components in percentage by weight: c: 0.15 to 0.35 percent of Si, 0.3 to 0.6 percent of Mn, 0.8 to 1.0 percent of Mn, 0.6 to 1.6 percent of Cr, 0.8 to 1 percent of Mo, 1 to 1.5 percent of Ni, 0.8 to 1.9 percent of Cu, 0.1 to 0.3 percent of Nb, 0.1 to 0.3 percent of N, 0.1 to 0.3 percent of Re, S, P being less than or equal to 0.03 percent, the balance being Fe and impurities, and the total amount of the impurities being less than or equal to 0.05 percent. The following is a further description with reference to specific examples.
Example 1
The preparation method of the wear-resistant corrosion-resistant bimetal composite pipe material comprises the following steps:
preparing an inner wall:
firstly, molding. The method comprises the steps of firstly designing the thickness of an inner wall and the outer surface of the inner wall according to the drawing requirements of a bimetallic tube, designing a plurality of bulges on the outer surface of the inner wall, and enabling the bulges to be surrounded by outer surface metal liquid when the outer wall metal liquid is poured.
And secondly, configuring raw materials. Weighing the following raw materials in parts by weight: pig iron, scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferroboron, ferrovanadium, nickel, copper, ferroniobium, nodulizer, manganese nitride, rare earth ferrosilicon and cerium silicon carbide.
And thirdly, smelting the raw materials. According to the requirements of material components, various furnace charges are clean and free of impurities. The metal charge materials are added in a reasonable sequence and at a proper time. The feeding sequence is as follows: pig iron-scrap steel, part of ferroalloy-scrap steel, melting the scrap steel, performing furnace front analysis, adding an intermediate alloy, and adjusting the components of molten steel. When the smelting temperature of molten iron reaches 1550 ℃, tapping into a spheroidizing ladle.
Fourthly, adding the key alloy and carrying out spheroidizing inoculation treatment. In order to ensure the absorption of chromium, boron, vanadium, niobium, nitrogen and cerium, the ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride and cerium silicon carbide are smashed into small blocks with the size of 3-5 mm, the small blocks are dried and then placed into a casting ladle, a nodulizer is placed at the bottommost part of the casting ladle, the ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride, cerium silicon carbide and an inoculant are placed on the upper part of the nodulizer, and an iron sheet accounting for 1% of the mass of the molten iron is covered at the topmost part of the casting ladle to prevent the premature spheroidization. And (4) pouring the molten iron in the third step into a spheroidizing ladle, slagging after the molten iron is reacted, standing, and then pouring.
Fifthly, casting and molding. And pouring the spheroidized inoculated molten iron into a casting mold, wherein the casting mold is a precoated sand casting mold or a lost foam casting mold or a water glass casting mold and the like. And cooling and solidifying the molten iron to obtain the as-cast nodular cast iron pipe.
Sixthly, cleaning and polishing. And cleaning, grinding and polishing the nodular cast iron pipe prepared in the fifth step for later use.
Putting the inner wall into a casting mould, smelting molten steel on the outer wall, and then casting the outer wall:
and a seventh step of smelting molten low-alloy steel according to a drawing and integral molding, putting the inner wall prepared in the sixth step into a casting mold, pouring the molten low-alloy steel, and cooling and forming to prepare a bimetallic pipe blank.
And eighthly, cleaning and grinding.
The ninth step of the self-lifting, heat treatment. And (2) carrying out heat treatment on the bimetallic pipe, controlling the temperature rise rate to 80-100 ℃ per hour below 600 ℃, carrying out heat preservation for 1 hour at 300 ℃ and 600 ℃ respectively, rapidly raising the temperature to-900 ℃ after 600 ℃, carrying out heat preservation, and calculating the heat preservation time according to the thickness of the bimetallic wall, wherein the heat preservation time is generally 1 hour every 25 mm. And after the heat preservation time is up, quenching, wherein the quenching liquid is 8% NaCl aqueous solution. Tempering is generally carried out immediately after quenching is finished, the tempering temperature is 235 ℃, and the tempering time is 3 hours.
The tenth step of shot blasting, size and performance detection and warehousing is carried out.
Analyzing the weight percentage content of the inner wall of the bimetallic tube by a spectrometer as follows: c: 3.8%, Si 2.3%, Mn 1.5%, Cr 0.3%, B: 0.25 percent of Ni, 0.28 percent of V, 1 percent of Mo, 0.8 percent of Ni, 1.0 percent of Cu, 0.3 percent of Nb and 0.2 percent of N0.03 percent of Ce, 0.05 percent of Mg, 0.05 percent of Re, S, P0.02.02 percent of Re and the balance of Fe and impurities. The mechanical property indexes of the inner wall of the bimetallic tube after heat treatment are as follows: HRC61, impact toughness: 12j/cm2。
Example 2
The preparation method of the wear-resistant corrosion-resistant bimetal composite pipe material comprises the following steps:
preparing an inner wall:
firstly, molding. The method comprises the steps of firstly designing the thickness of an inner wall and the outer surface of the inner wall according to the drawing requirements of a bimetallic tube, designing a plurality of bulges on the outer surface of the inner wall, and enabling the bulges to be surrounded by outer surface metal liquid when the outer wall metal liquid is poured.
And secondly, configuring raw materials. Weighing the following raw materials in parts by weight: pig iron, scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferroboron, ferrovanadium, nickel, copper, ferroniobium, nodulizer, manganese nitride, rare earth ferrosilicon and cerium silicon carbide.
And thirdly, smelting the raw materials. According to the requirements of material components, various furnace charges are clean and free of impurities. The metal charge materials are added in a reasonable sequence and at a proper time. The feeding sequence is as follows: pig iron-scrap steel, part of ferroalloy-scrap steel, melting the scrap steel, performing furnace front analysis, adding an intermediate alloy, and adjusting the components of molten steel. When the smelting temperature of the molten iron reaches 1530 ℃, tapping into a spheroidizing ladle.
Fourthly, adding the key alloy and carrying out spheroidizing inoculation treatment. In order to ensure the absorption of chromium, boron, vanadium, niobium, nitrogen and cerium, the ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride and cerium silicon carbide are smashed into small blocks with the size of 3-5 mm, the small blocks are dried and then placed into a casting ladle, a nodulizer is placed at the bottommost part of the casting ladle, the ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride, cerium silicon carbide and an inoculant are placed on the upper part of the nodulizer, and an iron sheet accounting for 1% of the mass of the molten iron is covered at the topmost part of the casting ladle to prevent the premature spheroidization. And (4) pouring the molten iron in the third step into a spheroidizing ladle, slagging after the molten iron is reacted, standing, and then pouring.
Fifthly, casting and molding. And pouring the spheroidized inoculated molten iron into a casting mold, wherein the casting mold is a precoated sand casting mold or a lost foam casting mold or a water glass casting mold and the like. And cooling and solidifying the molten iron to obtain the as-cast nodular cast iron pipe.
Sixthly, cleaning and polishing. And cleaning, grinding and polishing the nodular cast iron pipe prepared in the fifth step for later use.
Putting the inner wall into a casting mould, smelting molten steel on the outer wall, and then casting the outer wall:
and a seventh step of smelting molten low-alloy steel according to a drawing and integral molding, putting the inner wall prepared in the sixth step into a casting mold, pouring the molten low-alloy steel, and cooling and forming to prepare a bimetallic pipe blank.
And eighthly, cleaning and grinding.
The ninth step of the self-lifting, heat treatment. And (2) carrying out heat treatment on the bimetallic pipe, controlling the temperature rise rate to be 80-100 ℃ per hour below 600 ℃, carrying out heat preservation for 1 hour at 300 ℃ and 600 ℃ respectively, rapidly raising the temperature to 890 ℃ after 600 ℃, carrying out heat preservation, and calculating the heat preservation time according to the thickness of the bimetallic wall, wherein the heat preservation time is generally 1 hour per 25 mm. And after the heat preservation time is up, quenching is carried out, and the quenching liquid is selected. Tempering is generally carried out immediately after quenching is finished, the tempering temperature is 225 ℃, and the tempering time is 2.5 hours.
The tenth step of shot blasting, size and performance detection and warehousing is carried out.
Analyzing the weight percentage content of the inner wall of the bimetallic tube by a spectrometer as follows: c: 3.7%, Si 2.2%, Mn 1.3%, Cr 0.25%, B: 0.23%, V0.25%, Mo 0.9%, Ni 0.8%, Cu 1.0%, Nb 0.3%, N0.2%, Ce 0.03%, Mg 0.04%, Re 0.04%, S: 0.03%, P: 0.03 percent, and the balance of Fe and impurities. The mechanical property indexes of the inner wall of the bimetallic tube after heat treatment are as follows: HRC60, impact toughness: 11j/cm2。
Example 3
The preparation method of the wear-resistant corrosion-resistant bimetal composite pipe material comprises the following steps:
preparing an inner wall:
firstly, molding. The method comprises the steps of firstly designing the thickness of an inner wall and the outer surface of the inner wall according to the drawing requirements of a bimetallic tube, designing a plurality of bulges on the outer surface of the inner wall, and enabling the bulges to be surrounded by outer surface metal liquid when the outer wall metal liquid is poured.
And secondly, configuring raw materials. According to the mass percentage of the raw material elements: c: 3.5-3.8%, Si 1.9-2.3%, Mn 1-1.5%, Cr 0.1-0.3%, B: 0.02 to 0.25 percent of Cu, 0.1 to 0.28 percent of V, 0.8 to 1 percent of Mo, 0.6 to 0.8 percent of Ni, 0.8 to 1.0 percent of Cu, 0.1 to 0.3 percent of Nb, 0.05 to 0.2 percent of N, 0.02 to 0.03 percent of Ce, 0.03 to 0.05 percent of Mg, 0.03 to 0.05 percent of Re, S, P is less than or equal to 0.03 percent, and the balance of Fe and impurities. Weighing the following raw materials in parts by weight: pig iron, scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferroboron, ferrovanadium, nickel, copper, ferroniobium, nodulizer, manganese nitride, rare earth ferrosilicon and cerium silicon carbide.
And thirdly, smelting the raw materials. According to the requirements of material components, various furnace charges are clean and free of impurities. The metal charge materials are added in a reasonable sequence and at a proper time. The feeding sequence is as follows: pig iron-scrap steel, part of ferroalloy-scrap steel, melting the scrap steel, performing furnace front analysis, adding an intermediate alloy, and adjusting the components of molten steel. When the smelting temperature of molten iron reaches 1500 ℃, tapping iron into a spheroidizing ladle.
Fourthly, adding the key alloy and carrying out spheroidizing inoculation treatment. In order to ensure the absorption of chromium, boron, vanadium, niobium, nitrogen and cerium, the ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride and cerium silicon carbide are smashed into small blocks with the size of 3-5 mm, the small blocks are dried and then placed into a casting ladle, a nodulizer is placed at the bottommost part of the casting ladle, the ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride, cerium silicon carbide and an inoculant are placed on the upper part of the nodulizer, and an iron sheet accounting for 1% of the mass of the molten iron is covered at the topmost part of the casting ladle to prevent the premature spheroidization. And (4) pouring the molten iron in the third step into a spheroidizing ladle, slagging after the molten iron is reacted, standing, and then pouring.
Fifthly, casting and molding. And pouring the spheroidized inoculated molten iron into a casting mold, wherein the casting mold is a precoated sand casting mold or a lost foam casting mold or a water glass casting mold and the like. And cooling and solidifying the molten iron to obtain the as-cast nodular cast iron pipe.
Sixthly, cleaning and polishing. And cleaning, grinding and polishing the nodular cast iron pipe prepared in the fifth step for later use.
Putting the inner wall into a casting mould, smelting molten steel on the outer wall, and then casting the outer wall:
and a seventh step of smelting molten low-alloy steel according to a drawing and integral molding, putting the inner wall prepared in the sixth step into a casting mold, pouring the molten low-alloy steel, and cooling and forming to prepare a bimetallic pipe blank.
And eighthly, cleaning and grinding.
The ninth step of the self-lifting, heat treatment. And (2) carrying out heat treatment on the bimetallic pipe, controlling the temperature rise rate to be 80-100 ℃ per hour below 600 ℃, respectively carrying out heat preservation for 1 hour at 300 ℃ and 600 ℃, rapidly raising the temperature to 920 ℃ after 600 ℃, and carrying out heat preservation for 1 hour according to the thickness of the bimetallic wall, wherein the heat preservation time is generally 1 hour per 25 mm. And after the heat preservation time is up, quenching, wherein the quenching liquid is 10% NaCl aqueous solution. Tempering is generally carried out immediately after quenching is finished, the tempering temperature is 245 ℃, and the tempering time is 2 hours.
The tenth step of shot blasting, size and performance detection and warehousing is carried out.
Analyzing the weight percentage content of the inner wall of the bimetallic tube by a spectrometer as follows: c: 3.6%, Si 2.1%, Mn 1.0%, Cr 0.26%, B: 0.22%, V0.26%, Mo 0.88%, Ni 0.76%, Cu 0.96%, Nb 0.26%, N0.18%, Ce 0.03%, Mg 0.04%, Re 0.04%, S: 0.025%, P: 0.026%, and Fe and impurities in balance. The mechanical property indexes of the inner wall of the bimetallic tube after heat treatment are as follows: HRC61, impact toughness: 10j/cm2。
Example 4
The preparation method of the wear-resistant corrosion-resistant bimetal composite pipe material comprises the following steps:
preparing an inner wall:
firstly, molding. The method comprises the steps of firstly designing the thickness of an inner wall and the outer surface of the inner wall according to the drawing requirements of a bimetallic tube, designing a plurality of bulges on the outer surface of the inner wall, and enabling the bulges to be surrounded by outer surface metal liquid when the outer wall metal liquid is poured.
And secondly, configuring raw materials. Weighing the following raw materials in parts by weight: pig iron, scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferroboron, ferrovanadium, nickel, copper, ferroniobium, nodulizer, manganese nitride, rare earth ferrosilicon and cerium silicon carbide.
And thirdly, smelting the raw materials. According to the requirements of material components, various furnace charges are clean and free of impurities. The metal charge materials are added in a reasonable sequence and at a proper time. The feeding sequence is as follows: pig iron-scrap steel, part of ferroalloy-scrap steel, melting the scrap steel, performing furnace front analysis, adding an intermediate alloy, and adjusting the components of molten steel. When the smelting temperature of the molten iron reaches 1530 ℃, tapping into a spheroidizing ladle.
Fourthly, adding the key alloy and carrying out spheroidizing inoculation treatment. In order to ensure the absorption of chromium, boron, vanadium, niobium, nitrogen and cerium, the ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride and cerium silicon carbide are smashed into small blocks with the size of 3-5 mm, the small blocks are dried and then placed into a casting ladle, a nodulizer is placed at the bottommost part of the casting ladle, the ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride, cerium silicon carbide and an inoculant are placed on the upper part of the nodulizer, and an iron sheet accounting for 1% of the mass of the molten iron is covered at the topmost part of the casting ladle to prevent the premature spheroidization. And (4) pouring the molten iron in the third step into a spheroidizing ladle, slagging after the molten iron is reacted, standing, and then pouring.
Fifthly, casting and molding. And pouring the spheroidized inoculated molten iron into a casting mold, wherein the casting mold is a precoated sand casting mold or a lost foam casting mold or a water glass casting mold and the like. And cooling and solidifying the molten iron to obtain the as-cast nodular cast iron pipe.
Sixthly, cleaning and polishing. And cleaning, grinding and polishing the nodular cast iron pipe prepared in the fifth step for later use.
Putting the inner wall into a casting mould, smelting molten steel on the outer wall, and then casting the outer wall:
and a seventh step of smelting molten low-alloy steel according to a drawing and integral molding, putting the inner wall prepared in the sixth step into a casting mold, pouring the molten low-alloy steel, and cooling and forming to prepare a bimetallic pipe blank.
And eighthly, cleaning and grinding.
The ninth step of the self-lifting, heat treatment. And (2) carrying out heat treatment on the bimetallic pipe, controlling the temperature rise rate of below 600 ℃ per hour to be 80-100 ℃, respectively carrying out heat preservation for 1 hour at 300 ℃ and 600 ℃, rapidly raising the temperature to 880 ℃ after 600 ℃ and carrying out heat preservation, wherein the heat preservation time is calculated according to the thickness of the bimetallic wall, and the heat preservation time is generally carried out for 1 hour every 25 mm. And after the heat preservation time is up, quenching is carried out, and quenching oil is selected as quenching liquid. Tempering is generally carried out immediately after quenching is finished, the tempering temperature is 245 ℃, and the tempering time is 3 hours.
The tenth step of shot blasting, size and performance detection and warehousing is carried out.
Analyzing the weight percentage content of the inner wall of the bimetallic tube by a spectrometer as follows: c: 3.61%, Si 2.21%, Mn 1.3%, Cr 0.27%, B: 0.23%, V0.26%, Mo 0.98%, Ni 0.75%, Cu 0.96%, Nb 0.24%, N0.18%, Ce 0.03%, Mg 0.04%, Re 0.04%, S: 0.021%, P: 0.023 percent, and the balance of Fe and impurities. The mechanical property indexes of the inner wall of the bimetallic tube after heat treatment are as follows: HRC60, impact toughness: 11j/cm2。
While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims.
Claims (5)
1. The wear-resistant corrosion-resistant bimetal composite pipe material is characterized in that the inner wall of a pipe is made of carbide-containing martensite wear-resistant nodular cast iron, the metallographic structure of the material contains a martensite matrix and massive and granular carbides which are dispersedly distributed, and the weight percentages of chemical components are as follows: c: 3.5-3.8%, Si 1.9-2.3%, Mn 1-1.5%, Cr 0.1-0.3%, B: 0.02 to 0.25 percent of Cu, 0.1 to 0.28 percent of V, 0.8 to 1 percent of Mo, 0.6 to 0.8 percent of Ni, 0.8 to 1.0 percent of Cu, 0.1 to 0.3 percent of Nb, 0.05 to 0.2 percent of N, 0.02 to 0.03 percent of Ce, 0.03 to 0.05 percent of Mg, 0.03 to 0.05 percent of Re, S, P not more than 0.03 percent, the balance being Fe and impurities, and the total amount of the impurities not more than 0.06 percent;
the outer surface is made of low-alloy wear-resistant steel; the weight percentage of chemical components is as follows: c: 0.15 to 0.35 percent of Si, 0.3 to 0.6 percent of Mn, 0.8 to 1.0 percent of Mn, 0.6 to 1.6 percent of Cr, 0.8 to 1 percent of Mo, 1 to 1.5 percent of Ni, 0.8 to 1.9 percent of Cu, 0.1 to 0.3 percent of Nb, 0.1 to 0.3 percent of N, 0.1 to 0.3 percent of Re, S, P being less than or equal to 0.03 percent, the balance being Fe and impurities, and the total amount of the impurities being less than or equal to 0.05 percent.
2. The method for preparing the wear-resistant corrosion-resistant bimetal composite pipe material as claimed in claim 1, which is characterized by comprising the following steps:
(1) firstly, casting an inner wall:
a. firstly, designing the thickness of an inner wall and the outer surface of the inner wall according to requirements, wherein the outer surface of the inner wall is provided with a plurality of bulges;
b. preparing raw materials according to the mass percent of the elements, and weighing the raw materials with the required weight: pig iron, scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferroboron, ferrovanadium, nickel, copper, ferroniobium, nodulizer, manganese nitride, rare earth ferrosilicon and cerium silicon carbide;
c. smelting raw materials, namely adding materials except key alloy and a nodulizer into the raw materials in a reasonable sequence and at a proper time for smelting, and tapping iron into a spheroidizing ladle when the molten iron smelting temperature reaches 1500-1550 ℃;
d. adding a key alloy and carrying out spheroidizing inoculation, smashing ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride and cerium silicon carbide into small blocks with the size of 3-5 mm, drying and then putting the small blocks into a casting ladle, putting a spheroidizing agent at the bottommost part of the casting ladle, putting ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride, cerium silicon carbide and an inoculant on the upper part of the spheroidizing agent, covering an iron sheet accounting for 1% of the mass of molten iron on the topmost part of the casting ladle to prevent the spheroidizing reaction from being carried out prematurely, flushing molten iron liquid into the spheroidizing ladle, slagging after the reaction of the iron liquid is finished, and standing;
e. casting molding, namely casting the spheroidized inoculated molten iron into a casting mold, cooling and solidifying the molten iron to obtain an as-cast nodular cast iron pipe, and cleaning and polishing the as-cast nodular cast iron pipe;
(2) putting the inner wall into a casting mold, smelting outer wall molten steel, then pouring the outer wall, and firmly connecting the inner pipe wall and the outer pipe wall together by a plurality of bulges:
a. according to the integral modeling, smelting low alloy steel, putting the prepared inner wall into a casting mold, pouring low alloy steel liquid, wrapping a plurality of bulges by hot outer molten steel, according to the principle of expansion with heat and contraction with cold, after the outer molten steel is cooled, wrapping the bulges more tightly by the outer wall steel alloy, so that seamless connection is realized, and after cooling forming, preparing a bimetallic tube blank; cleaning and polishing;
b. carrying out heat treatment on the whole bimetallic pipe, firstly heating and preserving heat, quenching after the heat preservation time is up, and then carrying out tempering treatment; the temperature rise and heat preservation is that the temperature rise speed per hour is controlled to be 80-100 ℃ below 600 ℃, heat preservation is carried out for 1 hour at 300 ℃ and 600 ℃ respectively, after the temperature is 600 ℃, the temperature is quickly raised to 880-920 ℃ for heat preservation, the heat preservation time is calculated according to the thickness of a bimetal wall, and the heat preservation is carried out for 1 hour every 25 mm;
c. shot blasting, size and performance detection and warehousing.
3. The method for preparing a wear-resistant corrosion-resistant bimetal composite pipe material according to claim 2, wherein the feeding sequence in the step (1) c is as follows: pig iron-scrap steel, part of ferroalloy-scrap steel, performing furnace front analysis after melting the scrap steel, adding an intermediate alloy, and then adjusting the components of molten steel; the key alloy is ferrochrome, ferroboron, ferrovanadium, ferroniobium, manganese nitride and cerium silicon carbide.
4. The preparation method of the wear-resistant corrosion-resistant bimetal composite pipe material according to claim 2, wherein 8-10% NaCl aqueous solution or quenching oil is selected as the quenching liquid.
5. The method for preparing the wear-resistant corrosion-resistant bimetal composite pipe material according to claim 2, wherein the tempering temperature is 200-245 ℃.
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