CN117947247B - Seamless thin-wall high-nitrogen steel pipe and preparation method thereof - Google Patents
Seamless thin-wall high-nitrogen steel pipe and preparation method thereof Download PDFInfo
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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Abstract
A seamless thin-wall high-nitrogen steel pipe and a preparation method thereof belong to the technical field of stainless steel hot extrusion molding. In order to prepare the thin-wall steel pipe with high strength, high plasticity and high corrosion resistance, the preparation process flow of the invention comprises the steps of cylindrical steel casting, 1 st solid solution treatment, 2 nd hot extrusion, 1 st heat treatment, 1 st acid washing, 1 st cold rolling, 2 nd heat treatment, 2 nd acid washing, 2 nd cold rolling and 2 nd solid solution treatment; the material comprises the following components of 0.6-1.4wt% of nitrogen, 16.0-24.0wt% of chromium, 5.0-17.0wt% of manganese, 0.5-4.5wt% of nickel, 0.2-0.5wt% of silicon, 1.5-3.5wt% of molybdenum, 0.05-0.3wt% of niobium, 0.01-0.25wt% of titanium, less than or equal to 0.1wt% of cobalt, 0.01-0.1wt% of zinc and the like. The invention relates to a thin-wall steel pipe.
Description
Technical Field
The invention belongs to the technical field of stainless steel hot extrusion molding, and particularly relates to a seamless thin-wall high-nitrogen steel pipe and a preparation method thereof.
Background
The forming of the thin-wall long tubular forging is one of the difficulties in the field of metal plastic forming, the traditional long tubular forming process comprises drawing forming, spinning forming, extrusion forming and the like, the drawing forming process is mostly used for directly drawing a thin plate into a thin-wall tubular part, the wall thickness of the formed part is very thin, and the long tubular part with relatively thin wall thickness and excellent mechanical properties cannot be manufactured through the process. The spinning forming process is mainly used for thinning and strengthening the wall thickness of the thin-wall hollow revolving body, and blanks cannot be directly formed into long pipe parts through the process. Extrusion processes are mostly used for forming thick-walled pipe fittings, but the pipe length and wall thickness of formed parts are limited, and it is difficult to directly manufacture thin-walled long pipe-shaped parts by the processes. At present, the thin-wall steel pipe used in the fields of military gun tubes, ships and oceanographic engineering, petrochemical industry and the like is required to have the characteristics of light weight, high strength, high plasticity and high corrosion resistance, but the prior art cannot meet the requirements.
The invention patent with the application number 201310041404 and the invention name of 'a hot extrusion process of a thin wall 23000mm ultralong tube' discloses a process comprising blank processing, annular furnace heating, induction heating, lubrication, hot extrusion, cooling and inspection, wherein the wall thickness of the thin wall tube developed by the method is 5.5mm, the maximum tensile strength is 685MPa, and the elongation is 41 percent, but the wall thickness of the method has a certain limitation.
Disclosure of Invention
The invention aims to solve the problems of preparing a thin-wall steel pipe with high strength, high plasticity and high corrosion resistance, and provides a seamless thin-wall high-nitrogen steel pipe and a preparation method thereof.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
The preparation process flow of the preparation method comprises the steps of cylindrical steel casting, 1 st solid solution treatment, 2 nd hot extrusion, 1 st heat treatment, 1 st acid washing, 1 st cold rolling, 2 nd heat treatment, 2 nd acid washing, 2 nd cold rolling and 2 nd solid solution treatment;
The seamless thin-wall high-nitrogen steel pipe comprises the following material components: 0.6-1.4wt% of nitrogen, 16.0-24.0wt% of chromium, 5.0-17.0wt% of manganese, 0.5-4.5wt% of nickel, 0.2-0.5wt% of silicon, 1.5-3.5wt% of molybdenum, 0.05-0.3wt% of niobium, 0.01-0.25wt% of titanium, less than or equal to 0.1wt% of cobalt, 0.01-0.1wt% of zinc, 0.01-0.1wt% of lead, 0.05-0.35wt% of vanadium, less than or equal to 0.1wt% of copper, less than or equal to 0.05wt% of carbon, less than or equal to 0.008wt% of sulfur, less than or equal to 0.02wt% of phosphorus, and the balance of iron.
Further, the process for casting the cylindrical steel comprises the steps of coating refractory material powder in a casting mold, pouring the molten high nitrogen molten steel at 1550-1600 ℃ after induction heating into the casting mold, carrying out heat preservation for 1-4 hours, cooling the casting mold to room temperature by water to obtain cast round steel with the diameter of 35-160 mm, and then peeling, sawing, deep hole machining and lathe machining the cast round steel to finally obtain the cylindrical steel with the following material parameters: the roughness is 4-6 mu m, the cutting inclination of the end face after sawing is less than or equal to 2mm, the aperture after center hole processing is 8mm, the concentricity of drilling is less than or equal to 0.2mm, the diameter is 30-155 mm, and the length is 0.5-4 m.
Further, the 1 st solid solution treatment process is to adopt a continuous gas furnace to carry out solid solution treatment on the cylindrical steel, the gas furnace starts to heat rapidly from room temperature, the heating rate is 20 ℃/min-40 ℃/min, the heating is carried out to 820 ℃ -880 ℃, the temperature is kept for 10-30 min, the slow heating is continued, the heating rate is 10 ℃/min-30 ℃/min, the heating is carried out to 1050 ℃ -1180 ℃, the temperature is kept for 1 h-20 h, and the cylindrical steel after the 1 st solid solution treatment is obtained after the solid solution treatment is carried out by water cooling to room temperature rapidly after the furnace is taken out.
Further, the 2 times of hot extrusion process is to carry out hot extrusion molding on the cylindrical steel by adopting an extruder, put the cylindrical steel into an extrusion cylinder, heat the cylindrical steel to 1140-1280 ℃, keep the temperature for 1-6 hours, and move the extrusion head made of pure Mo forwards at a moving speed of 3-12 mm/s, wherein the outer diameter of a round pipe formed by the 1 st time of extrusion molding is 30-155 mm, and the wall thickness is 10-20 mm; the 2 nd extrusion molding is to ream the round tube obtained by the 1 st extrusion molding, the moving speed of the extrusion head is 4 mm/s-16 mm/s, the outer diameter of the round tube obtained by the 2 nd extrusion molding is 30 mm-155 mm, and the wall thickness is 8 mm-16 mm.
Further, the process of the 1 st heat treatment and the 1 st acid washing is as follows:
The 1 st heat treatment adopts a continuous gas furnace heating method, a round tube formed by extrusion for the 2 nd time is quickly heated to 1050-1180 ℃ at 10-30 ℃/min, the temperature is kept for 1-20 h, the round tube is cooled to room temperature after being discharged, then the round tube is subjected to 1 st acid washing, mixed acid of HNO 3 and HF with the mass ratio of 3:1 is arranged in a pickling tank, the round tube is subjected to acid washing, peeling and degreasing treatment, the acid washing time is 4-20 h, and then the round tube after the 1 st acid washing is obtained after water washing and drying, wherein the outer diameter is 26-150 mm, and the wall thickness is 6-12 mm.
Further, the 1 st cold rolling process is to cold-roll the round tube after the 1 st acid washing into a round tube with the diameter of 22 mm-120 mm, the wall thickness of 3 mm-6 mm and the length of 1 m-8 m by a cold rolling mill once, and then remove oil by alcohol after cold rolling to obtain the round tube after the 1 st cold rolling.
Further, the 2 nd heat treatment and 2 nd acid washing processes are as follows:
The 2 nd heat treatment adopts a continuous gas furnace heating method, the round tube after the 1 st cold rolling is quickly heated to 780-820 ℃ at a heating speed of 20-40 ℃/min, the temperature is kept for 0.5-4 h, the heating speed is 5-15 ℃/min, the temperature is 1050-1180 ℃, the temperature is kept for 0.5-4 h, the furnace is taken out, the water is cooled to room temperature, then the 2 nd pickling is carried out, the mixed acid of HNO 3 and HF with the mass ratio of 3:1 is configured in a pickling tank, the pickling and peeling and degreasing treatment are carried out on the round tube, the pickling time is 5-20 h, then the water washing and drying are carried out, and the round tube after the 2 nd pickling is obtained, wherein the outer diameter is 20-118 mm, the wall thickness is 2-5 mm, and the length is 1-8 m.
Further, the process of the 2 nd cold rolling is to utilize a cold rolling mill to carry out the 2 nd cold rolling on the round tube after the 2 nd acid washing to obtain a thin-wall round tube with the diameter of 15 mm-110 mm, the wall thickness of 1 mm-3 mm and the length of 1.5 m-12 m, and the round tube after the 2 nd cold rolling is obtained after the cold rolling and oil removal by alcohol.
Further, the process of the 2 nd solid solution treatment is to adopt a continuous gas furnace to carry out the solid solution treatment on the round tube after the 2 nd cold rolling, the gas furnace starts to heat from room temperature, the heating rate is 15 ℃/min-25 ℃/min, the heating is carried out to 1050 ℃ -1180 ℃, the heat is preserved for 2 h-10 h, and the round tube after the 2 nd solid solution treatment is obtained after the furnace is taken out and rapidly cooled to the room temperature.
A seamless thin-wall high-nitrogen steel pipe prepared by the preparation method of the seamless thin-wall high-nitrogen steel pipe is 15-110 mm in diameter, 1-3 mm in wall thickness and 1.5-12 m in pipe length.
The beneficial effects are that:
According to the preparation method of the seamless thin-wall high-nitrogen steel pipe, the high strength and the high plasticity of the high-nitrogen steel pipe material can realize the forming of the thin-wall pipe through a plurality of hot extrusion processes and a plurality of cold rolling processes, and the phenomena of surface roughness increase and surface protrusion of a circular pipe are not caused in the hot extrusion and cold rolling processes.
The high-nitrogen steel pipe prepared by the preparation method of the seamless thin-wall high-nitrogen steel pipe can greatly lighten the weight of structural members, improve the structural stability, and has the mechanical property and the quality meeting the application requirements in the fields of military barrels, ships, ocean engineering, petrochemical industry and the like, and can replace the prior 316L stainless steel pipe.
Detailed Description
The first embodiment is as follows:
The preparation process flow of the preparation method comprises the steps of cylindrical steel casting, 1 st solid solution treatment, 2 nd hot extrusion, 1 st heat treatment, 1 st acid washing, 1 st cold rolling, 2 nd heat treatment, 2 nd acid washing, 2 nd cold rolling and 2 nd solid solution treatment;
The seamless thin-wall high-nitrogen steel pipe comprises the following material components: 0.6-1.4wt% of nitrogen, 16.0-24.0wt% of chromium, 5.0-17.0wt% of manganese, 0.5-4.5wt% of nickel, 0.2-0.5wt% of silicon, 1.5-3.5wt% of molybdenum, 0.05-0.3wt% of niobium, 0.01-0.25wt% of titanium, less than or equal to 0.1wt% of cobalt, 0.01-0.1wt% of zinc, 0.01-0.1wt% of lead, 0.05-0.35wt% of vanadium, less than or equal to 0.1wt% of copper, less than or equal to 0.05wt% of carbon, less than or equal to 0.008wt% of sulfur, less than or equal to 0.02wt% of phosphorus, and the balance of iron.
Further, the process for casting the cylindrical steel comprises the steps of coating refractory material powder in a casting mold, pouring molten high nitrogen molten steel at 1580 ℃ after induction heating into the casting mold, preserving heat for 3 hours, cooling the casting mold to room temperature by water to obtain cast round steel with the diameter of 35-160 mm, and then peeling, sawing, deep hole machining and lathe machining the cast round steel to finally obtain the cylindrical steel with the following material parameters: the roughness is 4-6 mu m, the cutting inclination of the end face after sawing is less than or equal to 2mm, the aperture after center hole processing is 8mm, the concentricity of drilling is less than or equal to 0.2mm, the diameter is 230-155 mm, and the length is 0.5-4 m.
Further, the 1 st solid solution treatment process is to adopt a continuous gas furnace to carry out solid solution treatment on the cylindrical steel, the gas furnace starts to heat rapidly from room temperature, the heating rate is 20 ℃/min, the temperature is heated to 850 ℃, the heat preservation is carried out for 10min, the slow heating is continued, the heating rate is10 ℃/min, the temperature is heated to 1060 ℃, the heat preservation is carried out for 8h, and the cylindrical steel after the 1 st solid solution treatment is obtained after the solid solution treatment is carried out by rapidly cooling the cylindrical steel to room temperature.
Further, the 2 times of hot extrusion process is to carry out hot extrusion molding on the cylindrical steel by adopting an extruder, put the cylindrical steel into an extrusion cylinder, heat the cylindrical steel to 1200 ℃, keep the temperature for 4 hours, move the extrusion head made of pure Mo forwards at the moving speed of 3mm/s, and the outer diameter of a round pipe formed by the 1 st time of extrusion molding is 30-155 mm, and the wall thickness is 10-20 mm; the 2 nd extrusion molding is to ream the round tube obtained by the 1 st extrusion molding, the moving speed of the extrusion head is 4mm/min, the outer diameter of the round tube obtained by the 2 nd extrusion molding is 30 mm-155 mm, and the wall thickness is 8 mm-16 mm.
Further, the process of the 1 st heat treatment and the 1 st acid washing is as follows:
The 1 st heat treatment adopts a continuous gas furnace heating method, a round tube formed by extrusion for the 2 nd time is quickly heated to 1050 ℃ at 15 ℃/min, the temperature is kept for 30min, water is cooled to room temperature after discharging, then the 1 st acid washing is carried out, the mixed acid of HNO 3 and HF with the mass ratio of 3:1 is prepared in a pickling tank, the round tube is subjected to acid washing, peeling and degreasing treatment, the acid washing time is 30h, and then the round tube after the 1 st acid washing is obtained by washing and drying, wherein the outer diameter is 26 mm-150 mm, and the wall thickness is 6 mm-12 mm.
Further, the 1 st cold rolling process is to cold-roll the round tube after the 1 st acid washing into a round tube with the diameter of 60 mm-1200 mm, the wall thickness of 2.5 mm-14 mm and the length of 1 m-8 m by a cold rolling mill once, and then remove oil by alcohol after cold rolling to obtain the round tube after the 1 st cold rolling.
Further, the 2 nd heat treatment and 2 nd acid washing processes are as follows:
The 2 nd heat treatment adopts a continuous gas furnace heating method, the round tube after the 1 st cold rolling is quickly heated to 800 ℃ at a heating speed of 25 ℃/min, the heat is preserved for 2 hours, the slow heating is continued, the heating speed is 10 ℃/min, the heat is preserved for 1 hour, the furnace is taken out, the water is cooled to room temperature, then the 2 nd pickling is carried out, the mixed acid of HNO 3 and HF with the mass ratio of 3:1 is configured in a pickling tank, the pickling peeling and degreasing treatment is carried out on the round tube, the pickling time is 12 hours, and then the water washing and drying are carried out, so that the round tube after the 2 nd pickling is obtained, the outer diameter is 20 mm-118 mm, the wall thickness is 2 mm-5 mm, and the length is 1 m-8 m.
Further, the process of the 2 nd cold rolling is to utilize a cold rolling mill to carry out the 2 nd cold rolling on the round tube after the 2 nd acid washing to obtain a thin-wall round tube with the diameter of 15 mm-110 mm, the wall thickness of 1 mm-3 mm and the length of 1.5 m-12 m, and the round tube after the 2 nd cold rolling is obtained after the cold rolling and oil removal by alcohol.
Further, the process of the 2 nd solid solution treatment is to adopt a continuous gas furnace to carry out the solid solution treatment on the round tube after the 2 nd cold rolling, the gas furnace starts to heat from room temperature, the heating rate is 20 ℃/min, the temperature is heated to 1080 ℃, the heat is preserved for 8 hours, and the round tube after the 2 nd solid solution treatment is obtained after the furnace is taken out and rapidly cooled to the room temperature by water cooling.
The seamless thin-wall high-nitrogen steel pipe prepared by the preparation method of the seamless thin-wall high-nitrogen steel pipe is 15-110 mm in diameter, 1-3 mm in wall thickness and 1.5-12 m in pipe length.
The seamless thin-wall high-nitrogen steel pipe prepared by the preparation method of the seamless thin-wall high-nitrogen steel pipe is sampled according to the GB/T2975 standard, 5 samples are respectively taken from different batches of high-nitrogen steel pipes, the mechanical property test result is an average value of the 5 samples, the mechanical property accords with the GB/T14976-2002 standard, the actual detection result accords with the mechanical property standard, and the specific detection value is shown in the table 1: the high nitrogen-filled steel is data after cold rolling, and 316L is data measured in a solution treated state.
TABLE 1 mechanical Properties of Standard 316L stainless Steel and high Nitrogen Steel
The second embodiment is as follows:
The preparation process flow of the preparation method comprises the steps of cylindrical steel casting, 1 st solid solution treatment, 2 nd hot extrusion, 1 st heat treatment, 1 st acid washing, 1 st cold rolling, 2 nd heat treatment, 2 nd acid washing, 2 nd cold rolling and 2 nd solid solution treatment;
The seamless thin-wall high-nitrogen steel pipe comprises the following material components: 0.6-1.4wt% of nitrogen, 16.0-24.0wt% of chromium, 5.0-17.0wt% of manganese, 0.5-4.5wt% of nickel, 0.2-0.5wt% of silicon, 1.5-3.5wt% of molybdenum, 0.05-0.3wt% of niobium, 0.01-0.25wt% of titanium, less than or equal to 0.1wt% of cobalt, 0.01-0.1wt% of zinc, 0.01-0.1wt% of lead, 0.05-0.35wt% of vanadium, less than or equal to 0.1wt% of copper, less than or equal to 0.05wt% of carbon, less than or equal to 0.008wt% of sulfur, less than or equal to 0.02wt% of phosphorus, and the balance of iron.
Further, the process for casting the cylindrical steel comprises the steps of coating refractory material powder in a casting mold, pouring the molten high nitrogen molten steel at 1550 ℃ after induction heating into the casting mold, preserving heat for 4 hours, cooling the casting mold to room temperature by water to obtain cast round steel with the diameter of 35-160 mm, and then peeling, sawing, deep hole processing and lathe processing the cast round steel to finally obtain the cylindrical steel with the following material parameters: the roughness is 4-6 mu m, the cutting inclination of the end face after sawing is less than or equal to 2mm, the aperture after center hole processing is 8mm, the concentricity of drilling is less than or equal to 0.2mm, the diameter is 30-155 mm, and the length is 0.5-4 m.
Further, the 1 st solid solution treatment process is to adopt a continuous gas furnace to carry out solid solution treatment on the cylindrical steel, the gas furnace starts to heat rapidly from room temperature, the heating rate is 30 ℃/min, the temperature is heated to 840 ℃, the heat preservation is carried out for 25min, the slow heating is continued, the heating rate is 20 ℃/min, the temperature is heated to 1100 ℃, the heat preservation is carried out for 10h, and the cylindrical steel after the 1 st solid solution treatment is obtained after the solid solution treatment is carried out by rapidly cooling the cylindrical steel to room temperature.
Further, the 2 times of hot extrusion process is to carry out hot extrusion molding on the cylindrical steel by adopting an extruder, put the cylindrical steel into an extrusion cylinder, heat the cylindrical steel to 1200 ℃, keep the temperature for 4.5 hours, and move the extrusion head made of pure Mo forwards at a moving speed of 12mm/s, wherein the outer diameter of a round pipe formed by the 1 st time of extrusion molding is 30-155 mm, and the wall thickness is 10-20 mm; the 2 nd extrusion molding is to ream the round tube obtained by the 1 st extrusion molding, the moving speed of the extrusion head is16 mm/s, the outer diameter of the round tube obtained by the 2 nd extrusion molding is 30 mm-155 mm, and the wall thickness is 8 mm-16 mm.
Further, the process of the 1 st heat treatment and the 1 st acid washing is as follows:
The 1 st heat treatment adopts a continuous gas furnace heating method, a round tube formed by extrusion for the 2 nd time is rapidly heated to 1120 ℃ at 20 ℃/min, the temperature is kept for 2 hours, water is cooled to room temperature after the round tube is discharged, then the round tube is subjected to 1 st acid washing, the mixed acid of HNO 3 and HF with the mass ratio of 3:1 is prepared in a pickling tank, the round tube is subjected to acid washing, peeling and degreasing treatment, the acid washing time is 6 hours, and then the round tube is subjected to water washing and drying, so that the round tube with the outer diameter of 26 mm-150 mm and the wall thickness of 6 mm-12 mm after the 1 st acid washing is obtained.
Further, the 1 st cold rolling process is to cold-roll the round tube after 1 st acid washing into a round tube with the diameter of 22 mm-120 mm, the wall thickness of 3 mm-6 mm and the length of 1 m-8 m by a cold rolling mill once, and then remove oil by alcohol after cold rolling to obtain the round tube after 1 st cold rolling.
Further, the 2 nd heat treatment and 2 nd acid washing processes are as follows:
The 2 nd heat treatment adopts a continuous gas furnace heating method, the round tube after the 1 st cold rolling is quickly heated to 780 ℃ at a heating speed of 25 ℃/min, the heat is preserved for 1h, the slow heating is continued, the heating speed is 12 ℃/min, the heat is preserved for 3h, the furnace is taken out, the water is cooled to room temperature, then the 2 nd pickling is carried out, the mixed acid of HNO 3 and HF with the mass ratio of 3:1 is configured in a pickling tank, the pickling peeling and degreasing treatment is carried out on the round tube, the pickling time is 20, and then the water washing and drying are carried out, so that the round tube after the 2 nd pickling is obtained, the outer diameter is 20 mm-118 mm, the wall thickness is 2 mm-5 mm, and the length is 1 m-8 m.
Further, the process of the 2 nd cold rolling is to utilize a cold rolling mill to carry out the 2 nd cold rolling on the round tube after the 2 nd acid washing to obtain a thin-wall round tube with the diameter of 15 mm-110 mm, the wall thickness of 1 mm-3 mm and the length of 1.5 m-12 m, and oil is removed by alcohol after the cold rolling to obtain the round tube after the 2 nd cold rolling.
And further, the 2 nd solid solution treatment process is to adopt a continuous gas furnace to carry out solid solution treatment on the round tube after the 2 nd cold rolling, the gas furnace starts heating from room temperature, the heating rate is 18 ℃/min, the temperature is heated to 1100 ℃, the heat preservation is carried out for 6 hours, and the round tube after the 2 nd solid solution treatment is obtained after the furnace is taken out and rapidly cooled to room temperature.
The seamless thin-wall high-nitrogen steel pipe prepared by the preparation method of the seamless thin-wall high-nitrogen steel pipe is 15-110 mm in diameter, 1-3 mm in wall thickness and 1.5-12 m in pipe length.
And a third specific embodiment:
The preparation process flow of the preparation method comprises the steps of cylindrical steel casting, 1 st solid solution treatment, 2 nd hot extrusion, 1 st heat treatment, 1 st acid washing, 1 st cold rolling, 2 nd heat treatment, 2 nd acid washing, 2 nd cold rolling and 2 nd solid solution treatment;
The seamless thin-wall high-nitrogen steel pipe comprises the following material components: 0.6-1.4wt% of nitrogen, 16.0-24.0wt% of chromium, 5.0-17.0wt% of manganese, 0.5-4.5wt% of nickel, 0.2-0.5wt% of silicon, 1.5-3.5wt% of molybdenum, 0.05-0.3wt% of niobium, 0.01-0.25wt% of titanium, less than or equal to 0.1wt% of cobalt, 0.01-0.1wt% of zinc, 0.01-0.1wt% of lead, 0.05-0.35wt% of vanadium, less than or equal to 0.1wt% of copper, less than or equal to 0.05wt% of carbon, less than or equal to 0.008wt% of sulfur, less than or equal to 0.02wt% of phosphorus, and the balance of iron.
Further, the process for casting the cylindrical steel comprises the steps of coating refractory material powder in a casting mold, pouring molten high nitrogen molten steel at 1600 ℃ after induction heating into the casting mold, preserving heat for 1h, cooling the casting mold to room temperature by water to obtain cast round steel with the diameter of 35-160 mm, and then peeling, sawing, deep hole machining and lathe machining the cast round steel to finally obtain the cylindrical steel with the following material parameters: the roughness is 4-6 mu m, the cutting inclination of the end face after sawing is less than or equal to 2mm, the aperture after center hole processing is 8mm, the concentricity of drilling is less than or equal to 0.2mm, the diameter is 30-155 mm, and the length is 0.5-4 m.
Further, the 1 st solid solution treatment process is to adopt a continuous gas furnace to carry out solid solution treatment on the cylindrical steel, the gas furnace starts to heat rapidly from room temperature, the heating rate is 35 ℃/min, the temperature is raised to 860 ℃, the heat is preserved for 30min, the slow heating is continued, the heating rate is 30 ℃/min, the temperature is raised to 1170 ℃, the heat is preserved for 20h, and the cylindrical steel after the 1 st solid solution treatment is obtained after the furnace is taken out and cooled to room temperature rapidly.
Further, the 2 times of hot extrusion process is to carry out hot extrusion molding on the cylindrical steel by adopting an extruder, put the cylindrical steel into an extrusion cylinder, heat the cylindrical steel to 1280 ℃, keep the temperature for 6 hours, and move the extrusion head made of pure Mo forwards at a movement rate of 8mm/s, wherein the outer diameter of a round pipe formed by the 1 st time of extrusion molding is 30-155 mm, and the wall thickness is 10-20 mm; the 2 nd extrusion molding is to ream the round tube obtained by the 1 st extrusion molding, the moving speed of the extrusion head is 12mm/s, the outer diameter of the round tube obtained by the 2 nd extrusion molding is 30 mm-155 mm, and the wall thickness is 8 mm-16 mm.
Further, the process of the 1 st heat treatment and the 1 st acid washing is as follows:
the 1 st heat treatment adopts a continuous gas furnace heating method, a round tube formed by extrusion for the 2 nd time is quickly heated to 1180 ℃ at 30 ℃/min, the temperature is kept for 12 hours, water is cooled to room temperature after the round tube is discharged, then the 1 st acid washing is carried out, the mixed acid of HNO 3 and HF with the mass ratio of 3:1 is prepared in a pickling tank, the round tube is subjected to acid washing, peeling and degreasing treatment, the acid washing time is 20 hours, and then the round tube after the 1 st acid washing is obtained, the outer diameter is 26 mm-150 mm, and the wall thickness is 6 mm-12 mm.
Further, the 1 st cold rolling process is to cold-roll the round tube after 1 st acid washing into a round tube with the diameter of 22 mm-120 mm, the wall thickness of 3 mm-6 mm and the length of 1 m-8 m by a cold rolling mill once, and then remove oil by alcohol after cold rolling to obtain the round tube after 1 st cold rolling.
Further, the 2 nd heat treatment and 2 nd acid washing processes are as follows:
The 2 nd heat treatment adopts a continuous gas furnace heating method, the round tube after the 1 st cold rolling is quickly heated to 820 ℃ at a heating speed of 40 ℃/min, the heat is preserved for 3.5 hours, the continuous slow heating is carried out, the heating speed is 12 ℃/min, the heating is carried out to 1160 ℃, the heat is preserved for 4 hours, the furnace is taken out, the water is cooled to room temperature, then the 2 nd pickling is carried out, the mixed acid of HNO 3 and HF with the mass ratio of 3:1 is configured in a pickling tank, the pickling peeling and degreasing treatment is carried out on the round tube, the pickling time is 18 hours, then the water washing and the drying are carried out, and the round tube after the 2 nd pickling is obtained, wherein the outer diameter is 20 mm-118 mm, the wall thickness is 2 mm-5 mm, and the length is 1 m-8 m.
Further, the process of the 2 nd cold rolling is to utilize a cold rolling mill to carry out the 2 nd cold rolling on the round tube after the 2 nd acid washing to obtain a thin-wall round tube with the diameter of 15 mm-110 mm, the wall thickness of 1 mm-3 mm and the length of 1.5 m-12 m, and oil is removed by alcohol after the cold rolling to obtain the round tube after the 2 nd cold rolling.
And further, the process of the 2 nd solid solution treatment is to adopt a continuous gas furnace to carry out the solid solution treatment on the round tube after the 2 nd cold rolling, the gas furnace starts heating from room temperature, the heating rate is 25 ℃/min, the heating is carried out to 1140 ℃, the heat preservation is carried out for 10 hours, and the round tube after the 2 nd solid solution treatment is obtained after the furnace is taken out and rapidly cooled to room temperature.
The seamless thin-wall high-nitrogen steel pipe prepared by the preparation method of the seamless thin-wall high-nitrogen steel pipe is 15-110 mm in diameter, 1-3 mm in wall thickness and 1.5-12 m in pipe length.
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although the application has been described above with reference to specific embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the features of the disclosed embodiments may be combined with each other in any manner so long as there is no structural conflict, and the exhaustive description of these combinations is not given in this specification solely for the sake of brevity and resource saving. Therefore, it is intended that the application not be limited to the particular embodiments disclosed herein, but that the application will include all embodiments falling within the scope of the appended claims.
Claims (3)
1. The preparation method of the seamless thin-wall high-nitrogen steel pipe is characterized in that the preparation process flow of the preparation method comprises the steps of cylindrical steel casting, 1 st solid solution treatment, 2 times of hot extrusion, 1 st heat treatment, 1 st acid washing, 1 st cold rolling, 2 times of heat treatment, 2 nd acid washing, 2 nd cold rolling and 2 nd solid solution treatment;
The seamless thin-wall high-nitrogen steel pipe comprises the following material components: 0.6 to 1.4 weight percent of nitrogen, 16.0 to 24.0 weight percent of chromium, 5.0 to 17.0 weight percent of manganese, 0.5 to 4.5 weight percent of nickel, 0.2 to 0.5 weight percent of silicon, 1.5 to 3.5 weight percent of molybdenum, 0.05 to 0.3 weight percent of niobium, 0.01 to 0.25 weight percent of titanium, less than or equal to 0.1 weight percent of cobalt, 0.01 to 0.1 weight percent of zinc, 0.01 to 0.1 weight percent of lead, 0.05 to 0.35 weight percent of vanadium, less than or equal to 0.1 weight percent of copper, less than or equal to 0.05 weight percent of carbon, less than or equal to 0.008 weight percent of sulfur, less than or equal to 0.02 weight percent of phosphorus, and the balance of iron;
The 1 st solid solution treatment process is to adopt a continuous gas furnace to carry out solid solution treatment on the cylindrical steel, wherein the gas furnace starts to heat rapidly from room temperature, the heating rate is 20 ℃/min-40 ℃/min, the heating is carried out to 820 ℃ -880 ℃, the heat preservation is carried out for 10-30 min, the slow heating is continued, the heating rate is 10 ℃/min-30 ℃/min, the heating is carried out to 1050 ℃ -1180 ℃, the heat preservation is carried out for 1 h-20 h, and the cylindrical steel after the 1 st solid solution treatment is obtained after the furnace is taken out and cooled rapidly to room temperature for solid solution treatment;
The 2 times of hot extrusion process is to carry out hot extrusion molding on the cylindrical steel by adopting an extruder, put the cylindrical steel into an extrusion cylinder, heat the cylindrical steel to 1140-1280 ℃, keep the temperature for 1-6 hours, and move the extrusion head made of pure Mo forwards at a moving speed of 3-12 mm/s, wherein the outer diameter of a round pipe formed by the 1 st time of extrusion molding is 30-155 mm, and the wall thickness is 10-20 mm; the 2 nd extrusion molding is to ream the round tube obtained by the 1 st extrusion molding, the moving speed of the extrusion head is 4 mm/s-16 mm/s, the outer diameter of the round tube obtained by the 2 nd extrusion molding is 30 mm-155 mm, and the wall thickness is 8 mm-16 mm;
The 1 st heat treatment and 1 st acid washing process comprises the following steps:
The 1 st heat treatment adopts a continuous gas furnace heating method, a round tube formed by extrusion for the 2 nd time is quickly heated to 1050-1180 ℃ at 10-30 ℃/min, heat preservation is carried out for 1-20 h, water cooling is carried out to room temperature after the round tube is discharged, then 1 st acid washing is carried out, mixed acid of 95wt% HNO 3 and 5wt% HF with the mass ratio of 3:1 is configured in an acid washing tank, the round tube is subjected to acid washing and peeling and degreasing treatment, the acid washing time is 4-20 h, then water washing and drying are carried out, and the round tube after the 1 st acid washing is obtained, wherein the outer diameter is 26-150 mm, and the wall thickness is 6-12 mm;
the process of cold rolling for the 1 st time is that cold rolling the round tube after the 1 st time of acid washing into a round tube with the diameter of 22 mm-120 mm, the wall thickness of 3 mm-6 mm and the length of 1 m-8 m by a cold rolling machine for one time, and degreasing by alcohol after cold rolling to obtain the round tube after the 1 st time of cold rolling;
the 2 nd heat treatment and 2 nd acid washing processes are as follows:
The 2 nd heat treatment adopts a continuous gas furnace heating method, a round tube after the 1 st cold rolling is quickly heated to 780-820 ℃ at a heating speed of 20-40 ℃/min, the temperature is kept for 0.5-4 h, the heating speed is 5-15 ℃/min, the temperature is 1050-1180 ℃, the temperature is kept for 0.5-4 h, the furnace is taken out, the water is cooled to room temperature, then the 2 nd pickling is carried out, a mixed acid of HNO 3 and HF with the mass ratio of 3:1 is configured in a pickling tank, the pickling peeling and degreasing treatment is carried out on the round tube, the pickling time is 5-20 h, then the water washing and drying are carried out, and the round tube after the 2 nd pickling is obtained, wherein the outer diameter is 20-118 mm, the wall thickness is 2-5 mm, and the length is 1-8 m;
The process of the 2 nd cold rolling is that the round tube after the 2 nd acid washing is subjected to the 2 nd cold rolling by a cold rolling mill to obtain a thin-wall round tube with the diameter of 15 mm-110 mm, the wall thickness of 1 mm-3 mm and the length of 1.5 m-12 m, and the round tube after the 2 nd cold rolling is obtained after the cold rolling is deoiled by alcohol;
The process of the 2 nd solid solution treatment is to adopt a continuous gas furnace to carry out the solid solution treatment on the round tube after the 2 nd cold rolling, the gas furnace starts heating from room temperature, the heating rate is 15 ℃/min-25 ℃/min, the heating is carried out to 1050 ℃ -1180 ℃, the heat preservation is carried out for 2 h-10 h, and the round tube after the 2 nd solid solution treatment is obtained after the furnace is taken out and rapidly cooled to room temperature.
2. The method for preparing the seamless thin-wall high-nitrogen steel pipe according to claim 1, wherein the process of casting the cylindrical steel is characterized in that refractory material powder is coated in a casting mould, the molten high-nitrogen molten steel at 1550 ℃ -1600 ℃ after induction heating is poured into the casting mould, the casting mould is cooled to room temperature after heat preservation for 1-4 hours, the cast round steel with the diameter of 35-160 mm is obtained, and then the cast round steel is peeled, sawed, deep hole machined and lathe machined, and finally the material parameters of the cylindrical steel are obtained: the roughness is 4-6 mu m, the cutting inclination of the end face after sawing is less than or equal to 2mm, the aperture after center hole processing is 8mm, the concentricity of drilling is less than or equal to 0.2mm, the diameter is 30-155 mm, and the length is 0.5-4 m.
3. A seamless thin-wall high nitrogen steel pipe prepared by the preparation method of the seamless thin-wall high nitrogen steel pipe according to any one of claims 1 to 2, which is characterized in that the diameter of the seamless thin-wall high nitrogen steel pipe is 15mm to 110mm, the wall thickness is 1mm to 3mm, and the pipe length is 1.5m to 12m.
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