CN115838897A - Martensite wear-resistant corrosion-resistant steel pipe for 415 HB-level sediment conveying pipeline and preparation method thereof - Google Patents
Martensite wear-resistant corrosion-resistant steel pipe for 415 HB-level sediment conveying pipeline and preparation method thereof Download PDFInfo
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- 238000001816 cooling Methods 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 20
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Abstract
The invention discloses a martensite wear-resistant corrosion-resistant steel pipe of 415 HB-level sediment conveying pipeline and a preparation method thereof, wherein the martensite wear-resistant corrosion-resistant steel pipe comprises the following chemical components in percentage by mass: c:0.1 to 0.25 percent; si:0.1 to 0.3 percent; mn:0.5-1.5%; cu:0.4 to 1.0 percent; ni:0.1 to 0.5 percent; cr:0.5-1.4%; nb:0.01 to 0.2 percent; al:0.035 to 0.10 percent; ti:0.01 to 0.04 percent; mo:0.1 to 0.4 percent; b:0.001-0.003%; 0.001-0.008% of N; s is less than or equal to 0.003 percent; p is less than or equal to 0.01 percent; the balance being Fe and unavoidable impurity elements. Heating to 850-950 deg.C, keeping the temperature for 15-30min, water quenching, and tempering at 200-300 deg.C for 1-2h to obtain martensite structure. The surface brinell hardness of the prepared steel plate is as follows: 415 plus or minus 15HB; the tensile strength is more than or equal to 1400MPa, the yield strength is more than or equal to 1050MPa, the elongation is more than or equal to 12 percent, the Charpy V-shaped impact energy at the temperature of minus 20 ℃ is more than or equal to 90J, and the excellent low-temperature toughness and strength are shown. In a slurry solution of 3.5% NaCl concentration, the anti-corrosive wear performance was 1.5 times or more that of the conventional NM 450. The thickness of the steel pipe is 15-30mm, and the diameter is 800-1200mm.
Description
Technical Field
The invention belongs to the technical field of low-alloy martensite wear-resistant corrosion-resistant steel, and particularly relates to a martensite wear-resistant corrosion-resistant steel pipe for 415 HB-level sediment conveying pipelines.
Background
The total dredging amount of China increases year by year, and the dredging engineering industry relates to various aspects such as the construction and maintenance of ports and channels of coastal and inland rivers, the construction of coastal industrial areas and the development of coastal cities, water conservancy flood control dredging, environmental protection and improvement, and the like. The dredging equipment can realize efficient excavation of seabed rock soil and synchronous long-distance transportation, the conveying pipeline has serious failure under the action of complex harsh environments (complex rock soil abrasion and seawater corrosion such as coarse sand, rock blocks, broken stones, sand mixed pebbles and the like), and the service life of the conventional low-alloy steel pipeline is generally not more than 6 months. The general martensite wear-resistant steel is difficult to form, the manufacturing efficiency and the manufacturing cost are far higher than those of common steel, and the toughness, the plasticity and the stress corrosion cracking resistance of the high-hardness martensite are lower, so that stress corrosion cracking occurs in the service process of a pipeline, and the construction progress is seriously influenced.
At present, most of high-grade wear-resistant steel is martensite steel, but certain difficulty is necessarily brought to the pipe manufacturing process due to high yield strength of the martensite steel. For example, the high hardness (500 HB, 550HB, 600 HB) slurry dredging pipes disclosed in Bao steel and the production method thereof, patent publication Nos. CN201710383618.4, CN108950422A, CN108950421A, the yield strength of which reaches more than 1200MPa, and the yield strength of the given example steel is more than 1300MPa, the stress corrosion resistance after the pipes are barely manufactured is inevitably influenced, and the result is true according to the actual use condition.
Publication No. CN 113789468A discloses a wear-resistant corrosion-resistant steel plate for a silt conveying pipeline and a preparation method thereof, wherein the corrosion resistance of the wear-resistant corrosion-resistant steel plate reaches more than 4 times of that of the conventional NM450, but the abrasion resistance of the wear-resistant corrosion-resistant steel plate is not given. The Sb element added is 0.08-0.12%, which improves the corrosion resistance of the steel, but is liable to cause surface cracks during continuous casting, rolling or heat treatment.
The publication number CN 113106341A discloses a high-strength and high-toughness weldable corrosion-resistant wear-resistant steel plate and a preparation method thereof, and the idea of a nanoscale Ti-containing second-phase reinforced matrix is provided, but the production efficiency is influenced due to the complex rolling and heat treatment processes. In addition, the addition of 0.12 to 0.25% of Zr can refine the structure and prevent hot shortness, but the large amount of Zr increases the size of Zr-containing inclusions in the steel, which affects the low-temperature toughness. The steel sheet as a corrosion-and abrasion-resistant steel sheet does not show a level of abrasion resistance.
Disclosure of Invention
In view of the above, the present invention aims to provide a martensite wear-resistant corrosion-resistant steel pipe for 415 HB-level sediment transport pipelines, which is a martensite wear-resistant steel pipe resistant to seawater wear corrosion, and solves the problem that the prior art cannot simultaneously consider the wear resistance and the workability of the steel plate.
In order to achieve the purpose, the invention adopts the following technical scheme:
the martensite wear-resistant corrosion-resistant steel pipe for 415HB level silt conveying pipelines comprises the following chemical components in percentage by mass:
c:0.1 to 0.25 percent; si:0.1 to 0.3 percent; mn:0.5-1.5%; cu:0.4 to 1.0 percent; ni:0.1 to 0.5 percent; cr:0.5-1.4%; nb:0.01 to 0.2 percent; al:0.035 to 0.10 percent; ti:0.01 to 0.04 percent; mo:0.1 to 0.4 percent; (ii) a B:0.001-0.003%; 0.001-0.008% of N; s is less than or equal to 0.003 percent; p is less than or equal to 0.01 percent; the balance being Fe and unavoidable impurity elements.
Preferably, the martensite wear-resistant corrosion-resistant steel pipe for the sediment conveying pipeline comprises the following chemical components in percentage by mass:
c:0.10 to 0.19 percent; si:0.12 to 0.18 percent; mn:0.5-1.5%; cu:0.4-0.6%; ni:0.2 to 0.4 percent; cr:0.5-1.2%; nb:0.01 to 0.1 percent; al:0.004-0.08%; ti:0.01 to 0.04 percent; mo:0.1 to 0.4 percent; b:0.001-0.003%; 0.005-0.008% of N; s is less than or equal to 0.003 percent; p is less than or equal to 0.01 percent; the balance being Fe and unavoidable impurity elements.
The action and the proportion of each element of the invention are as follows:
c: the important element for improving hardenability in the steel can obviously increase the hardness of martensite. Meanwhile, carbon is used as a solid solution element to improve the yield strength and tensile strength of the material, but the smelting difficulty is increased due to the excessively high carbon content, so that the steel is difficult to process, and the welding performance is poor. The carbon ratio of 0.1-0.25% is preferably selected, and the carbon content is preferably controlled to be 0.10-0.19%.
Si: silicon is an effective deoxidizer and can improve the purity of molten steel. Silicon also has the function of solid solution strengthening, and the strength and hardness of steel are improved, so that the wear resistance is improved. However, too high a silicon content deteriorates the weldability of the steel and also adversely affects the toughness. In the invention, the content of silicon is controlled to be 0.1-0.3%. Preferably, the silicon content is between 0.12 and 0.18%.
Mn: manganese is a deoxidizer and a desulfurizer, and the quality of steel can be improved by adding manganese into molten steel. Manganese is an effective element for expanding an austenite phase region as an alloy element, and even austenite can be obtained after water quenching after enough manganese is added. The addition of manganese to low alloy steel can improve the strength and hardenability of the steel. However, too high a manganese content causes segregation, affects the uniformity of the structure, and also affects the weldability. The invention controls the manganese content to be 0.5-1.5%, which is most beneficial to the performance.
Cu: the most common alloy elements for improving atmospheric corrosion resistance can offset the harmful effect of sulfur in steel. The addition of proper copper into steel can improve the hardenability and corrosion resistance of steel, and the effect is more obvious under the interaction of corrosion and abrasion. However, excessive copper adversely affects weldability and strength. The invention limits the copper content to 0.4-1.0%, preferably, the copper content is 0.4-0.6%.
Ni: nickel is an element for enlarging the austenite phase region, which can significantly improve the low-temperature toughness of steel, but Ni is a precious alloy element, so the present invention controls the content of nickel to be 0.1-0.5%, and preferably, the content of nickel is between 0.2-0.4%.
Cr: chromium is an element effective in increasing the electrode potential of steel, thereby improving corrosion resistance, and simultaneously improving hardenability, strength and hardness of steel. The invention is mainly used in the ocean dredging engineering, needs to be used in seawater for a long time, and therefore needs enough seawater corrosion resistance. However, too high a chromium content deteriorates the weldability and the workability. Therefore, the content of Cr is controlled to 0.5 to 1.4%, preferably 0.5 to 1.2%.
Nb/Ti: niobium and titanium are used as strong carbonitride forming elements, can pin austenite grain boundaries, can refine grain size, are precipitated in the rolling process, and play a role in strengthening a second phase. In order to further control the cost, the content of niobium and titanium is not too high, wherein the content of niobium is preferably 0.01-0.1%, and the content of titanium is preferably 0.01-0.04%.
Al: aluminum is used as a strong deoxidizing element and can reduce the content of oxygen in steel. Aluminum can also form AlN with nitrogen as a precipitation phase to prevent the growth of austenite at high temperature and refine the size of original austenite. The invention controls the content of aluminum to be 0.04-0.08%.
Mo: molybdenum can improve the hardenability and weldability of steel, can form Mo (C, N) with carbon and nitrogen in steel, plays a role in precipitation strengthening and improves the strength of the steel. The invention controls the content of molybdenum as follows: 0.1 to 0.4 percent.
B: a small amount of boron has great effect on hardenability, and 0.001-0.003% of trace boron is added in the invention, so that the use amount of other expensive alloying elements is reduced, and the cost is controlled. When the boron content is not controlled well, segregation is easily generated, and boride is precipitated, which is extremely disadvantageous to mechanical properties.
N: the invention contains less microalloy elements such as Nb, ti, mo and the like, is easy to form nitride or carbonitride with N, and plays a role of strengthening as a second phase. However, too high a nitrogen content may affect the ductility and toughness of the steel. The invention controls the content of nitrogen to be 0.001-0.008%, and preferably, the content of nitrogen is 0.005-0.008%.
S/P: harmful impurity elements which are difficult to avoid in the steelmaking process increase the brittleness of steel. Sulfur is very easy to form long strip-shaped inclusions such as MnS, and the plasticity and the toughness are deteriorated. Phosphorus deteriorates the weldability and reduces the plasticity. The two elements need to be strictly controlled, and S is controlled to be less than or equal to 0.003 percent; p is less than or equal to 0.01 percent.
The invention also provides a preparation method of the martensite wear-resistant corrosion-resistant steel pipe, which sequentially comprises the following steps:
1) Molten iron is pretreated by molten iron, smelted by a 120-ton converter, refined by LF, refined by RH and continuously cast by plate blanks, wherein the continuous casting drawing speed is 0.8-1.3m/min, the heating temperature is 1100-1300 ℃, and the heat preservation time is 2-5 hours;
2) Sequentially carrying out the following steps after continuous casting of a slab: heating, controlling rolling, controlling cooling, detecting flaw and carrying out heat treatment on the wide and thick plate production line;
wherein the rolling comprises 6-10 rough rolling passes and 10-20 finish rolling passes, the initial rolling temperature of the rough rolling is 1150-1200 ℃, the initial rolling temperature of the finish rolling is 950-1150 ℃, and the final rolling temperature is 850-880 ℃. The thickness of the manufactured continuous casting slab is 10-50mm. The cooling comprises air cooling or accelerated cooling after rolling, wherein the start cooling temperature is 750-770 ℃, and the final cooling temperature is 650-670 ℃. The heat treatment is quenching and tempering, and the quenching temperature interval is as follows: 850-950 ℃ and the tempering temperature range is 200-300 ℃, wherein the quenching heat preservation time is 15-30min, and the tempering heat preservation time is 1-2h. After rolling, the billet is cooled in air to room temperature, then heated to above 850-950 ℃ and kept warm for 15-30min, water quenching is carried out, and then tempering is carried out for 1-2h at 200-300 ℃ to finally obtain the martensite structure.
3) And (3) carrying out tube manufacturing on the obtained steel plate, including edge milling, pre-bending, press forming, seam closing and welding. The number of steps in the compression molding is 40-60. Backing welding is adopted for joint closing, the diameter of a welding wire is 1-2mm, and the welding voltage is 15-25V. The welding comprises inner welding and outer welding, both adopt a double-wire submerged arc welding mode, the diameter of a welding wire is 3-5mm, the welding voltage is 20-40V, and the welding speed is 800-900mm/min. The diameter of the prepared steel pipe is 800-1200mm, and the thickness is 15-30mm.
The tensile strength of the welding seam of the martensite wear-resistant corrosion-resistant steel pipe is not less than 1470Mpa, the yield strength is not less than 1300Mpa, the elongation is not less than 10%, the impact energy of the parent metal at the temperature of 20 ℃ below zero is not less than 80J, the impact energy of the fusion line, the fusion line plus 1mm, the fusion line plus 3mm and the impact energy of the fusion line plus 5mm at the temperature of 20 ℃ below zero are respectively more than 90J, 80J, 170J and 170J, and the welding performance is excellent.
Compared with the prior art, the corrosion resistance is further improved by adding Cu in the aspect of component design; ni is added to improve low-temperature toughness; the yield strength is adjusted by reducing the content of C, and the difficulty in pipe making is reduced.
Compared with the prior art, the invention has the advantages that:
by the process, the corrosion resistance is improved by adjusting chemical components; ni is added to improve low-temperature toughness; the yield strength is adjusted by reducing the content of C, and the difficulty in pipe making is reduced. The Brinell hardness of the surface of the steel plate is as follows: 415 plus or minus 15HB; tensile strength is more than or equal to 1400MPa, yield strength is more than or equal to 1050MPa, elongation is more than or equal to 12%, and Charpy V-shaped impact energy at minus 20 ℃ is more than or equal to 90J. The abrasion resistance was 1.5 times or more as high as that of the conventional NM450 in a 3.5% NaCl solution environment. Expensive alloy elements are not added, the rolling and tube making processes are simple, the cost is controlled, and the production efficiency is improved.
Drawings
FIG. 1 is a metallographic structure diagram of a steel obtained in example 1 of the present invention;
FIG. 2 is a metallographic structure drawing of a steel obtained in example 1 of the present invention;
FIG. 3 is a metallographic structure chart of a steel obtained in example 2 of the present invention;
FIG. 4 is a metallographic structure drawing of a steel obtained in example 2 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
Example 1
The chemical composition of the embodiment comprises the following components in percentage by mass: c:0.186%; si:0.16 percent; mn:0.74 percent; cu:0.4 percent; ni:0.26 percent; cr:0.56 percent; nb:0.02 percent; al:0.035%; ti:0.016 percent; mo:0.202 percent; b:0.0016 percent; 0.005 percent of N; s is less than or equal to 0.003 percent; p is less than or equal to 0.01 percent; the manufacturing process comprises the following steps: molten iron is pretreated by molten iron, smelted by a converter, refined by LF (ladle furnace), refined by RH (Ruhrstahl Heraeus) and continuously cast by slab, heated, and subjected to rolling, cooling, flaw detection and heat treatment by controlling a wide and thick plate production line. Wherein the continuous casting drawing speed is 1.0m/min, the heating temperature is 1150 ℃, the heat preservation time is 4 hours, the rough rolling is carried out for 7 passes, the finish rolling is carried out for 10 passes, the initial rolling temperature of the rough rolling is 1160 ℃, the initial rolling temperature of the finish rolling is 1000 ℃, the final rolling temperature is 880 ℃, and the air cooling is carried out after the rolling. The thickness of the manufactured steel plate is 16mm, the metallographic structure of the steel is shown in figures 1-2, and the matrix structure of the steel is martensite. The heat treatment process comprises the following steps: quenching and tempering, wherein the quenching temperature is as follows: 910 ℃, the tempering temperature is 200 ℃, the quenching heat preservation time is 20min, and the tempering heat preservation time is 1h. And (3) performing edge milling, pre-bending, press forming, joint closing and welding on the manufactured steel plate to finally obtain the martensite steel pipe, wherein the step number in the press forming is 50 times. Backing welding is adopted for joint closing, the diameter of a welding wire is 2mm, and the welding voltage is 25V. The welding comprises inner welding and outer welding, and adopts a double-wire submerged arc welding mode, the diameter of a welding wire is 4mm, the welding voltage is 30V, and the welding speed is 800mm/min. The diameter of the prepared steel pipe is 800mm. The mechanical properties and abrasion resistance are shown in table 1.
Example 2
The chemical composition of the embodiment comprises the following components in percentage by mass: c:0.176%; si:0.17 percent; mn:1.4 percent; cu:0.6 percent; ni:0.4 percent; cr:0.86 percent; nb:0.06 percent; al:0.045%; ti:0.036%; mo:0.1 percent; (ii) a B:0.0021%; 0.006 percent of N; s is less than or equal to 0.003 percent; p is less than or equal to 0.01 percent; the manufacturing process comprises the following steps: molten iron is pretreated by molten iron, smelted by a converter, refined by LF (ladle furnace), refined by RH (Ruhrstahl Heraeus) and continuously cast by slab, heated, and subjected to rolling, cooling, flaw detection and heat treatment by controlling a wide and thick plate production line. Wherein the continuous casting drawing speed is 1.1m/min, the heating temperature is 1300 ℃, the heat preservation time is 3 hours, the rough rolling is carried out for 9 passes, the finish rolling is carried out for 10 passes, the initial rolling temperature of the rough rolling is 1200 ℃, the initial rolling temperature of the finish rolling is 1050 ℃, the final rolling temperature is 860 ℃, and the air cooling is carried out after the rolling. The thickness of the manufactured steel plate is 25mm, the metallographic structure of the steel is shown in figures 3-4, and the matrix structure of the steel is martensite. The heat treatment process comprises the following steps: quenching and tempering, wherein the quenching temperature is as follows: the temperature is 950 ℃, the tempering temperature is 300 ℃, the quenching heat preservation time is 20min, and the tempering heat preservation time is 1.5h. And (3) milling edges, pre-bending, press forming, seaming and welding the manufactured steel plate to finally obtain the martensite steel pipe, wherein the step number in the press forming is 40 times. Backing welding is adopted for joint closing, the diameter of a welding wire is 2mm, and the welding voltage is 25V. The welding comprises inner welding and outer welding, and adopts a double-wire submerged arc welding mode, the diameter of a welding wire is 5mm, the welding voltage is 40V, and the welding speed is 900mm/min. The diameter of the prepared steel pipe is 1200mm. The mechanical properties and abrasion resistance are shown in table 1.
Example 3
The chemical composition of the embodiment comprises the following components in percentage by mass: c:0.1 percent; si:0.1 percent; mn:0.5 percent; cu:0.4 percent; ni:0.1 percent; cr:0.5 percent; nb:0.01 percent; al:0.035%; ti:0.01 percent; mo:0.1 percent; (ii) a B:0.001 percent; n:0.001 percent; s is less than or equal to 0.003 percent; p is less than or equal to 0.01 percent; the manufacturing process comprises the following steps: molten iron is pretreated by molten iron, smelted by a converter, refined by LF (ladle furnace), refined by RH (Ruhrstahl Heraeus) and continuously cast by slab, heated, and subjected to rolling, cooling, flaw detection and heat treatment by controlling a wide and thick plate production line. Wherein the continuous casting drawing speed is 0.8m/min, the heating temperature is 11000 ℃, the heat preservation time is 2 hours, the rough rolling is carried out for 6 passes, the finish rolling is carried out for 10 passes, the initial rolling temperature of the rough rolling is 1150 ℃, the initial rolling temperature of the finish rolling is 950 ℃, the final rolling temperature is 850 ℃, and the air cooling is carried out after the rolling. The thickness of the manufactured steel plate is 10mm, and the metallographic matrix structure of the steel is martensite. The heat treatment process comprises the following steps: quenching and tempering, wherein the quenching temperature is as follows: the temperature of 850 ℃, the tempering temperature of 200 ℃, the quenching heat preservation time of 15min and the tempering heat preservation time of 1h. And (3) milling edges, pre-bending, press forming, seaming and welding the manufactured steel plate to finally obtain the martensite steel pipe, wherein the step number in the press forming is 40 times. Backing welding is adopted for joint closing, the diameter of a welding wire is 1mm, and the welding voltage is 15V. The welding comprises inner welding and outer welding, and adopts a double-wire submerged arc welding mode, the diameter of a welding wire is 3mm, the welding voltage is 20V, and the welding speed is 800mm/min. The diameter of the prepared steel pipe is 800mm. The mechanical properties and abrasion resistance are shown in table 1.
Example 4
The chemical composition of the embodiment comprises the following components in percentage by mass: c:0.25 percent; si:0.3 percent; mn:1.5 percent; cu:1.0 percent; ni:0.5 percent; cr:1.4 percent; nb:0.2 percent; al:0.10 percent; ti:0.04 percent; mo:0.4 percent; (ii) a B:0.003%; n:0.008 percent; s is less than or equal to 0.003 percent; p is less than or equal to 0.01 percent; the manufacturing process comprises the following steps: molten iron is subjected to molten iron pretreatment, converter smelting, LF refining, RH refining, slab continuous casting, heating, rolling control of a wide and thick plate production line, cooling control, flaw detection and heat treatment. Wherein the continuous casting drawing speed is 1.3m/min, the heating temperature is 1300 ℃, the heat preservation time is 5 hours, the rough rolling is performed for 10 passes, the finish rolling is performed for 20 passes, the initial rolling temperature of the rough rolling is 1200 ℃, the initial rolling temperature of the finish rolling is 1050 ℃, the final rolling temperature is 860 ℃, and the air cooling is performed after the rolling. The thickness of the manufactured steel plate is 50mm, and the metallographic structure of the steel is martensite. The heat treatment process comprises the following steps: quenching and tempering, wherein the quenching temperature is as follows: the temperature is 950 ℃, the tempering temperature is 300 ℃, the quenching heat preservation time is 30min, and the tempering heat preservation time is 2h. And (3) milling edges, pre-bending, press forming, seaming and welding the manufactured steel plate to finally obtain the martensite steel pipe, wherein the step number in the press forming is 60 times. Backing welding is adopted for joint closing, the diameter of a welding wire is 2mm, and the welding voltage is 25V. The welding comprises inner welding and outer welding, and adopts a double-wire submerged arc welding mode, the diameter of a welding wire is 5mm, the welding voltage is 40V, and the welding speed is 900mm/min. The diameter of the prepared steel pipe is 1200mm. The mechanical properties and abrasion resistance are shown in table 1.
TABLE 1 comparison of the mechanical properties and abrasion resistance of the inventive examples with NM450 and Q235
The steel obtained in the above examples showed martensite in the microstructure, the brinell hardness of the steel sheet surface: 415 plus or minus 15HB; tensile strength is more than or equal to 1400MPa, yield strength is more than or equal to 1050MPa, elongation is more than or equal to 12%, and Charpy V-shaped impact energy at minus 20 ℃ is more than or equal to 90J. The abrasion resistance was 1.5 times or more as high as that of the conventional NM450 in a 3.5% NaCl solution environment.
The method can be realized by upper and lower limit values and interval values of intervals of process parameters (such as temperature, time and the like), and embodiments are not listed.
Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The martensite wear-resistant corrosion-resistant steel pipe for the 415 HB-level sediment conveying pipeline is characterized by comprising the following chemical components in percentage by mass:
c:0.1 to 0.25 percent; si:0.1 to 0.3 percent; mn:0.5-1.5%; cu:0.4 to 1.0 percent; ni:0.1 to 0.5 percent; cr:0.5-1.4%; nb:0.01 to 0.2 percent; al:0.035 to 0.10 percent; ti:0.01 to 0.04 percent; mo:0.1 to 0.4 percent; b:0.001-0.003%; 0.001 to 0.008 percent of N; s is less than or equal to 0.003 percent; p is less than or equal to 0.01 percent; the balance being Fe and unavoidable impurity elements.
2. The martensitic wear-resistant corrosion-resistant steel pipe for 415HB grade sediment conveying pipes according to claim 1, which is characterized in that the chemical composition of the martensitic wear-resistant corrosion-resistant steel pipe comprises:
c:0.10 to 0.19 percent; si:0.12 to 0.18 percent; mn:0.5-1.5%; cu:0.4 to 0.6 percent; ni:0.2 to 0.4 percent; cr:0.5-1.2%; nb:0.01 to 0.1 percent; al:0.004-0.08%; ti:0.01 to 0.04 percent; mo:0.1 to 0.4 percent; b:0.001-0.003%; 0.005-0.008% of N; s is less than or equal to 0.003 percent; p is less than or equal to 0.01 percent; the balance being Fe and unavoidable impurity elements.
3. The martensite wear-resistant corrosion-resistant steel pipe for 415HB grade sediment transport pipelines according to claim 1, wherein the surface Brinell hardness of the martensite wear-resistant corrosion-resistant steel pipe is as follows: 415 plus or minus 15HB; the tensile strength is more than or equal to 1400MPa, the yield strength is more than or equal to 1050MPa, the elongation is more than or equal to 12 percent, and the Charpy V-shaped impact energy at the temperature of minus 20 ℃ is more than or equal to 90J; under the environment of 3.5 percent NaCl solution, the abrasion resistance is more than 1.5 times of that of the traditional NM 450;
the tensile strength of the welding seam of the martensite wear-resistant corrosion-resistant steel pipe is more than or equal to 1470Mpa, the yield strength is more than or equal to 1300Mpa, the elongation is more than or equal to 10 percent, and the impact energy at minus 20 ℃ is more than or equal to 80J; the impact energy at-20 ℃ at the fusion line, the fusion line plus 1mm, the fusion line plus 3mm and the fusion line plus 5mm is respectively more than 90J, 80J, 170J and 170J.
4. A preparation method of a martensite wear-resistant corrosion-resistant steel pipe for 415 HB-level silt conveying pipelines comprises the following steps:
1) Molten iron is pretreated by molten iron, smelted by a 120-ton converter, refined by LF (ladle furnace), refined by RH (Ruhrstahl Heraeus) and continuously cast by plate blanks;
wherein the continuous casting drawing speed is 1.0-1.5m/min, the heating temperature is 1200-1400 ℃, and the heat preservation time is 3-6 hours;
2) The continuous casting plate blank is sequentially subjected to heating, wide and thick plate production line control rolling, controlled cooling, flaw detection and heat treatment to obtain a steel plate;
wherein, the rolling comprises rough rolling for 6 to 10 times and finish rolling for 10 to 20 times, the initial rolling temperature of the rough rolling is 1150 to 1200 ℃, the initial rolling temperature of the finish rolling is 950 to 1150 ℃, and the final rolling temperature is 850 to 880 ℃;
3) The obtained steel plate is subjected to edge milling, pre-bending, press forming, joint closing and welding to obtain the martensite wear-resistant corrosion-resistant steel pipe.
5. The manufacturing method according to claim 4, wherein the thickness of the continuous casting slab in the step 1) is 10-50mm.
6. The preparation method according to claim 4, wherein in the step 2), the controlled cooling comprises air cooling or accelerated cooling after rolling, the start cooling temperature is 750-770 ℃, and the end cooling temperature is 650-670 ℃.
7. The manufacturing method according to claim 4, wherein in the step 2), the heat treatment is quenching + tempering, and the quenching temperature range is as follows: quenching at 850-950 deg.C for 15-30min; the tempering temperature interval is 200-300 ℃, and the tempering heat preservation time is 1-2h.
8. The production method according to claim 4, wherein in the step 3), the number of steps in the press molding is 40 to 60 times.
9. The preparation method of claim 4, wherein in the step 3), backing welding is adopted for joint closing, the diameter of a welding wire is 1-2mm, and the welding voltage is 15-25V;
the welding comprises inner welding and outer welding, and adopts a double-wire submerged arc welding mode, the diameter of a welding wire is 3-5mm, the welding voltage is 20-40V, and the welding speed is 800-900mm/min.
10. The method according to claim 4, wherein in the step 3), the produced martensite wear-resistant and corrosion-resistant steel pipe has a diameter of 800-1200m and a thickness of 15-30mm.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100147424A1 (en) * | 2007-05-29 | 2010-06-17 | Jfe Steel Corporation | Abrasion-resistant steel excellent in formability and production method thereof |
| CN102407426A (en) * | 2010-09-26 | 2012-04-11 | 上海月月潮钢管制造有限公司 | Method for manufacturing low alloy steel tube of low-temperature pressure vessel |
| CN104662193A (en) * | 2012-09-19 | 2015-05-27 | 杰富意钢铁株式会社 | Wear-resistant steel plate having excellent low-temperature toughness and corrosion wear resistance |
| CN106271387A (en) * | 2015-05-11 | 2017-01-04 | 上海月月潮管道科技有限公司 | Inside cover the manufacture method of corrosion resisting alloy straight seam welded steel pipe |
| CN112063917A (en) * | 2020-07-28 | 2020-12-11 | 江阴兴澄特种钢铁有限公司 | Wear-resistant steel plate for artificial board machine equipment and manufacturing method thereof |
| CN113322409A (en) * | 2020-02-28 | 2021-08-31 | 宝山钢铁股份有限公司 | High-strength and high-toughness mining chain steel and manufacturing method thereof |
| CN113789468A (en) * | 2021-08-05 | 2021-12-14 | 莱芜钢铁集团银山型钢有限公司 | Wear-resistant corrosion-resistant steel plate for silt conveying pipeline and preparation method thereof |
-
2022
- 2022-11-18 CN CN202211445596.7A patent/CN115838897A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100147424A1 (en) * | 2007-05-29 | 2010-06-17 | Jfe Steel Corporation | Abrasion-resistant steel excellent in formability and production method thereof |
| CN102407426A (en) * | 2010-09-26 | 2012-04-11 | 上海月月潮钢管制造有限公司 | Method for manufacturing low alloy steel tube of low-temperature pressure vessel |
| CN104662193A (en) * | 2012-09-19 | 2015-05-27 | 杰富意钢铁株式会社 | Wear-resistant steel plate having excellent low-temperature toughness and corrosion wear resistance |
| CN106271387A (en) * | 2015-05-11 | 2017-01-04 | 上海月月潮管道科技有限公司 | Inside cover the manufacture method of corrosion resisting alloy straight seam welded steel pipe |
| CN113322409A (en) * | 2020-02-28 | 2021-08-31 | 宝山钢铁股份有限公司 | High-strength and high-toughness mining chain steel and manufacturing method thereof |
| CN112063917A (en) * | 2020-07-28 | 2020-12-11 | 江阴兴澄特种钢铁有限公司 | Wear-resistant steel plate for artificial board machine equipment and manufacturing method thereof |
| CN113789468A (en) * | 2021-08-05 | 2021-12-14 | 莱芜钢铁集团银山型钢有限公司 | Wear-resistant corrosion-resistant steel plate for silt conveying pipeline and preparation method thereof |
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