CN115478224A - High-temperature-resistant corrosion-resistant seamless steel pipe and preparation method thereof - Google Patents
High-temperature-resistant corrosion-resistant seamless steel pipe and preparation method thereof Download PDFInfo
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- CN115478224A CN115478224A CN202211187826.4A CN202211187826A CN115478224A CN 115478224 A CN115478224 A CN 115478224A CN 202211187826 A CN202211187826 A CN 202211187826A CN 115478224 A CN115478224 A CN 115478224A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 97
- 239000010959 steel Substances 0.000 title claims abstract description 97
- 238000005260 corrosion Methods 0.000 title claims abstract description 32
- 230000007797 corrosion Effects 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 56
- 239000002994 raw material Substances 0.000 claims abstract description 48
- 238000011282 treatment Methods 0.000 claims abstract description 33
- 238000005098 hot rolling Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000003723 Smelting Methods 0.000 claims abstract description 18
- 238000005097 cold rolling Methods 0.000 claims abstract description 17
- 238000004381 surface treatment Methods 0.000 claims abstract description 17
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 12
- 238000005303 weighing Methods 0.000 claims abstract description 12
- 238000005242 forging Methods 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 238000002474 experimental method Methods 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000004140 cleaning Methods 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 11
- 230000003064 anti-oxidating effect Effects 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000010622 cold drawing Methods 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000008199 coating composition Substances 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 5
- 239000000839 emulsion Substances 0.000 claims description 5
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- 238000011221 initial treatment Methods 0.000 claims description 5
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- 239000002245 particle Substances 0.000 claims description 5
- 238000007517 polishing process Methods 0.000 claims description 5
- 229910052702 rhenium Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000009864 tensile test Methods 0.000 claims description 5
- 238000005491 wire drawing Methods 0.000 claims description 5
- 239000010687 lubricating oil Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims 1
- 239000011651 chromium Substances 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000010935 stainless steel Substances 0.000 abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 4
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 4
- 238000011160 research Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 9
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
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- 239000011265 semifinished product Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- 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
- B21C37/30—Finishing tubes, e.g. sizing, burnishing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a high-temperature-resistant corrosion-resistant seamless steel tube and a preparation method thereof, wherein the formula comprises the following components: C. mn, P, S, si, ni, cr, N, re and Fe, the method comprises the first step of weighing raw materials; step two, primary heat treatment; step three, smelting; step four, forging and hot rolling; step five, hot perforation; step six, secondary heat treatment; step seven, cold rolling and wheel drawing; step eight, surface treatment; step nine, heat treatment is carried out for three times; step ten, straightening; step eleven, performing surface finishing treatment; step twelve, detecting in an experiment; compared with the existing production process of the ultra-pure high-chromium ferrite stainless steel tube, the invention solves the problems of poor product plasticity and easy breakage by optimizing the formula; the invention develops a new process flow, improves the tolerance precision of the product and avoids the great waste of raw materials; the invention researches a brand-new heat treatment process, and greatly improves the properties of the product, such as hardness, compressive capacity, yield strength and the like.
Description
Technical Field
The invention relates to the technical field of seamless steel pipes, in particular to a high-temperature-resistant and corrosion-resistant seamless steel pipe and a preparation method thereof.
Background
The ultra-pure high-chromium ferrite stainless steel is a high-grade corrosion-resistant alloy material, has very strong electric corrosion resistance, uniform corrosion resistance and stress corrosion resistance, has good anti-seismic performance and heat transfer performance, can be widely applied to high-end fields such as a condensation system of a nuclear power station, a cooling system of a thermal power plant, seawater desalination and the like, is innovated in the last century abroad by a large amount of equipment and processes, has higher smelting level of the ultra-pure high-chromium ferrite stainless steel, and can not realize industrial wide application due to high strength and poor plasticity of products and easy fracture in the actual rolling process at home; the traditional integral production process limits the length of a semi-finished product to be only 3 meters, so that a large amount of raw materials are wasted, the finishing treatment of a subsequent product is influenced, and the tolerance precision is poor; the steel pipe produced by the existing heat treatment process has the problems of low hardness, poor pressure resistance and weak yield strength.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant and corrosion-resistant seamless steel pipe and a preparation method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a high-temperature-resistant corrosion-resistant seamless steel pipe comprises the following components in percentage by weight: C. mn, P, S, si, ni, cr, N, re and Fe, wherein the mass percent of each component is as follows: 0.035% of C, 1.5% of Mn, 0.30% of P, 0.025% of S, 0.08% of Si, less than or equal to 0.75% of Ni, 23-25% of Cr, 0.2% of N, 0.3% of Re and the balance of Fe.
Preferably, the mass percentage of each component is as follows: 0.035% C, 1.5% Mn, 0.30% P, 0.025% S, 0.08% Si, 0.75% Ni, 23% Cr, 0.2% N, 0.3% Re and 73.81% Fe.
A preparation method of a high-temperature-resistant corrosion-resistant seamless steel tube comprises the following steps of firstly, weighing raw materials; step two, primary heat treatment; step three, smelting; step four, forging and hot rolling; step five, hot perforation; step six, secondary heat treatment; step seven, cold rolling and wheel drawing; step eight, surface treatment; step nine, carrying out heat treatment for three times; step ten, straightening; step eleven, performing surface finishing treatment; step twelve, detecting in an experiment;
in the first step, the components in percentage by mass are as follows: selecting 0.035% of C, 1.5% of Mn, 0.30% of P, 0.025% of S, 0.08% of Si, 0.75% of Ni, 23% of Cr, 0.2% of N, 0.3% of Re and 73.81% of Fe, and weighing according to the mass percentage sum of 1;
in the second step, all the raw materials in the first step are added into a hearth to carry out primary heat treatment;
in the third step, the raw materials after heat treatment are put into a closed continuous roller hearth furnace and smelted at 1500-1800 ℃ until all components are dissolved to obtain a smelting solution;
in the fourth step, the smelting liquid obtained in the third step is taken, cast ingot forging is carried out, and then the cast ingot forging is sent into a strip steel hot rolling mill for hot rolling to obtain an extended strip steel;
in the fifth step, the band steel obtained in the fourth step is subjected to hot perforation treatment to prepare the wall of the steel pipe;
taking the pipe wall of the steel pipe obtained in the fifth step, and putting the pipe wall into a hearth for secondary heat treatment;
putting the pipe wall subjected to the secondary heat treatment into a hot rolling mill, cold rolling the pipe wall by a hot rolled plate at normal temperature, and cold drawing the pipe wall subjected to the cold rolling through a wire drawing die hole to obtain a steel pipe blank;
in the eighth step, the surface treatment is carried out on the steel pipe blank obtained in the seventh step, and the surface treatment comprises the steps of cleaning surface particles by adopting compressed air and cleaning the surface of the steel pipe by using a cleaning emulsion;
in the ninth step, the steel pipe blank subjected to primary treatment in the eighth step is put into a hearth for heat treatment for three times;
straightening the steel pipe blank subjected to the third heat treatment in the tenth step by adopting a roller straightening mode and low-temperature cold straightening;
performing surface finishing treatment on the straightened pipe blank in the eleventh step, wherein the surface finishing treatment comprises a surface finishing polishing process and special coating anti-oxidation treatment to obtain a finished steel pipe;
and in the twelfth step, the finished steel pipe obtained in the eleventh step is taken to carry out performance detection, wherein the performance detection comprises size testing, tensile testing, hardness testing, flattening testing, flaring testing, water pressure testing, ultrasonic testing, eddy current testing and crystal corrosion testing.
Preferably, in the second step, the length of the hearth is 20m, the temperature is set to be 100-780 ℃, the temperature is increased section by section and time by time, the temperature is increased by 100 ℃ in each time interval, the water is rapidly cooled after the temperature is increased, the rotating speed in the furnace is 50r/h, and the time from the feeding of the raw materials to the discharging of the raw materials is 7-8h.
Preferably, in the fourth step, homogenization annealing is performed on the ingot after the ingot is cast, so that the next operation can be continued.
Preferably, in the sixth step, the length of the hearth is 20m, the temperature is set to be 150-700 ℃, the temperature is 100 ℃ at each time interval, the water is rapidly cooled after the temperature is raised, the rotating speed in the furnace is 70r/h, and the time from the feeding of the raw materials to the discharging of the raw materials is 6-7h.
Preferably, in the ninth step, the length of the hearth is 20m, the temperature is set to be 180-680 ℃, the temperature is increased section by section and time by time, the temperature is increased by 100 ℃ in each time interval, the water is rapidly cooled after the temperature is increased, the rotating speed in the furnace is 80r/s, and the time from the feeding of the raw materials to the discharging of the raw materials is 5.5-6.6h.
Preferably, in the step ten, the straightening manner includes, but is not limited to, pressure straightening, tension straightening and stretch bending straightening.
Preferably, in the eleventh step, the coating formulation used for the oxidation protection treatment of the special coating comprises 70% of chemical and wetting oil and 30% of evaporating agent.
Compared with the prior art, the invention has the beneficial effects that: compared with the existing production process of the ultra-pure high-chromium ferrite stainless steel tube, the invention solves the problems of poor product plasticity and easy breakage by optimizing the formula; the invention develops a new process flow, improves the tolerance precision of the product and avoids the great waste of raw materials; the invention researches a brand-new heat treatment process, and greatly improves the properties of the product such as hardness, compressive capacity, yield strength and the like.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a technical solution provided by the present invention:
example 1:
a high-temperature-resistant corrosion-resistant seamless steel pipe comprises the following components in percentage by weight: C. mn, P, S, si, ni, cr, N, re and Fe, wherein the mass percent of each component is as follows: 0.035% C, 1.5% Mn, 0.30% P, 0.025% S, 0.08% Si, 0.75% Ni, 23% Cr, 0.2% N, 0.3% Re, and 73.81% Fe.
A preparation method of a high-temperature-resistant and corrosion-resistant seamless steel tube comprises the following steps of firstly, weighing raw materials; step two, primary heat treatment; step three, smelting; step four, forging and hot rolling; step five, hot perforation; step six, secondary heat treatment; step seven, cold rolling and wheel drawing; step eight, surface treatment; step nine, heat treatment is carried out for three times; step ten, straightening; step eleven, performing surface finishing treatment; step twelve, detecting in an experiment;
in the first step, the components in percentage by mass are as follows: selecting 0.035% of C, 1.5% of Mn, 0.30% of P, 0.025% of S, 0.08% of Si, 0.75% of Ni, 23% of Cr, 0.2% of N, 0.3% of Re and 73.81% of Fe, and weighing according to the mass percentage sum of 1;
in the second step, the raw materials in the first step are added into a hearth for carrying out primary heat treatment, wherein the length of the hearth is 20m, the temperature is set to be 100-780 ℃, the temperature is increased section by section and time by time, the temperature is increased by 100 ℃ in each time interval, the water is rapidly cooled after the temperature is increased, the rotating speed in the furnace is 50r/h, and the time from the feeding of the raw materials to the discharging of the raw materials is 7-8h;
in the third step, the raw materials after heat treatment are put into a closed continuous roller hearth furnace and smelted at 1500-1800 ℃ until all components are dissolved to obtain a smelting solution;
in the fourth step, the smelting liquid obtained in the third step is taken, cast ingots are forged, then the cast ingots are sent into a strip steel hot rolling mill for hot rolling to obtain extended strip steel, and homogenization annealing is carried out on the extended strip steel after the cast ingots are cast so as to continue the next operation;
in the fifth step, the band steel obtained in the fourth step is subjected to hot perforation treatment to prepare the wall of the steel pipe;
in the sixth step, the pipe wall of the steel pipe obtained in the fifth step is put into a hearth for secondary heat treatment, wherein the length of the hearth is 20m, the temperature is set to be 150-700 ℃, the temperature is 100 ℃ at each time interval, the steel pipe is rapidly cooled after being heated, the rotating speed in the furnace is 70r/h, and the time from feeding the raw material into the furnace to discharging the raw material from the furnace is 6-7h;
putting the pipe wall subjected to the secondary heat treatment into a hot rolling mill, cold rolling the pipe wall by a hot rolled plate at normal temperature, and cold drawing the pipe wall subjected to the cold rolling through a wire drawing die hole to obtain a steel pipe blank;
in the eighth step, the surface treatment is carried out on the steel pipe blank obtained in the seventh step, and the surface treatment comprises the steps of cleaning surface particles by adopting compressed air and cleaning the surface of the steel pipe by using a cleaning emulsion;
in the ninth step, the steel pipe blank subjected to primary treatment in the eighth step is put into a hearth for heat treatment for three times, wherein the length of the hearth is 20m, the temperature is set to be 180-680 ℃, the steel pipe blank is heated section by section and time by time, the temperature is increased at 100 ℃ in each time period, the steel pipe blank is rapidly cooled by water after being heated, the rotating speed in the furnace is 80r/s, and the time from feeding the raw materials into the furnace to discharging the furnace is 5.5-6.6 hours;
straightening the steel pipe blank subjected to the third heat treatment in the tenth step, wherein the straightening mode is roller straightening and low-temperature cold straightening is adopted, and the straightening mode comprises but is not limited to pressure straightening, tension straightening and stretch bending straightening;
in the eleventh step, the straightened tube blank is subjected to surface finishing treatment, which comprises a surface finishing polishing process and special coating anti-oxidation treatment, so as to obtain a finished steel tube, wherein the coating formula used in the special coating anti-oxidation treatment comprises 70% of chemical and lubricating oil and 30% of an evaporating agent;
and in the twelfth step, the finished steel pipe obtained in the eleventh step is taken for performance detection, wherein the performance detection comprises size test, tensile test, hardness test, flattening test, flaring test, water pressure test, ultrasonic test, eddy current test and crystal corrosion test.
Example 2:
a high-temperature-resistant corrosion-resistant seamless steel pipe comprises the following components in percentage by weight: C. mn, P, S, si, ni, cr, N, re and Fe, wherein the mass percent of each component is as follows: 0.035% C, 1.5% Mn, 0.30% P, 0.025% S, 0.08% Si, 0.70% Ni, 24% Cr, 0.2% N, 0.3% Re and 72.86% Fe.
A preparation method of a high-temperature-resistant corrosion-resistant seamless steel tube comprises the following steps of firstly, weighing raw materials; step two, primary heat treatment; step three, smelting; step four, forging and hot rolling; step five, hot perforation; step six, secondary heat treatment; step seven, cold rolling and wheel drawing; step eight, surface treatment; step nine, heat treatment is carried out for three times; step ten, straightening; step eleven, performing surface finishing treatment; step twelve, detecting in an experiment;
in the first step, the components in percentage by mass are as follows: selecting 0.035% of C, 1.5% of Mn, 0.30% of P, 0.025% of S, 0.08% of Si, 0.70% of Ni, 24% of Cr, 0.2% of N, 0.3% of Re and 72.86% of Fe, and weighing according to the mass percentage sum of 1;
in the second step, the raw materials in the first step are added into a hearth for carrying out primary heat treatment, wherein the length of the hearth is 20m, the temperature is set to be 100-780 ℃, the temperature is increased section by section and time by time, the temperature is increased by 100 ℃ in each time interval, the water is rapidly cooled after the temperature is increased, the rotating speed in the furnace is 50r/h, and the time from the feeding of the raw materials to the discharging of the raw materials is 7-8h;
in the third step, the raw materials after heat treatment are put into a closed continuous roller hearth furnace and smelted at 1500-1800 ℃ until all components are dissolved to obtain a smelting solution;
in the fourth step, the smelting liquid obtained in the third step is taken, cast ingots are forged, then the cast ingots are sent into a strip steel hot rolling mill for hot rolling to obtain extended strip steel, and homogenization annealing is carried out on the extended strip steel after the cast ingots are cast so as to continue the next operation;
in the fifth step, the band steel obtained in the fourth step is subjected to hot perforation treatment to prepare the wall of the steel pipe;
in the sixth step, the pipe wall of the steel pipe obtained in the fifth step is put into a hearth for secondary heat treatment, wherein the length of the hearth is 20m, the temperature is set to be 150-700 ℃, the temperature is 100 ℃ at each time interval, the steel pipe is rapidly cooled after being heated, the rotating speed in the furnace is 70r/h, and the time from feeding the raw material into the furnace to discharging the raw material from the furnace is 6-7h;
putting the pipe wall subjected to the secondary heat treatment into a hot rolling mill, cold rolling the pipe wall by a hot rolled plate at normal temperature, and cold drawing the pipe wall subjected to the cold rolling through a wire drawing die hole to obtain a steel pipe blank;
in the eighth step, the surface treatment is carried out on the steel pipe blank obtained in the seventh step, and the surface treatment comprises the steps of cleaning surface particles by adopting compressed air and cleaning the surface of the steel pipe by using a cleaning emulsion;
in the ninth step, the steel pipe blank subjected to primary treatment in the eighth step is put into a hearth for heat treatment for three times, wherein the length of the hearth is 20m, the temperature is set to be 180-680 ℃, the steel pipe blank is heated section by section and time by time, the temperature is 100 ℃ at each time interval, the steel pipe blank is rapidly cooled by water after being heated, the rotating speed in the furnace is 80r/s, and the time from feeding the raw materials into the furnace to discharging the raw materials is 5.5-6.6 hours;
straightening the steel pipe blank subjected to the third heat treatment in the tenth step, wherein the straightening mode is roller straightening and low-temperature cold straightening is adopted, and the straightening mode comprises but is not limited to pressure straightening, tension straightening and stretch bending straightening;
performing surface finishing treatment on the straightened pipe blank in the eleventh step, wherein the surface finishing treatment comprises a surface finishing polishing process and special coating anti-oxidation treatment to obtain a finished steel pipe, and a coating formula used in the special coating anti-oxidation treatment comprises 70% of chemical and lubricating oil and 30% of an evaporating agent;
and in the twelfth step, the finished steel pipe obtained in the eleventh step is taken for performance detection, wherein the performance detection comprises size test, tensile test, hardness test, flattening test, flaring test, water pressure test, ultrasonic test, eddy current test and crystal corrosion test.
Example 3:
a high-temperature-resistant corrosion-resistant seamless steel pipe comprises the following components in percentage by weight: C. mn, P, S, si, ni, cr, N, re and Fe, wherein the mass percent of each component is as follows: 0.035% C, 1.5% Mn, 0.30% P, 0.025% S, 0.08% Si, 0.65% Ni, 25% Cr, 0.2% N, 0.3% Re, and 71.91% Fe.
A preparation method of a high-temperature-resistant corrosion-resistant seamless steel tube comprises the following steps of firstly, weighing raw materials; step two, primary heat treatment; step three, smelting; step four, forging and hot rolling; step five, hot perforation; step six, secondary heat treatment; step seven, cold rolling and wheel drawing; step eight, surface treatment; step nine, heat treatment is carried out for three times; step ten, straightening; step eleven, performing surface finishing treatment; step twelve, detecting in an experiment;
in the first step, the components in percentage by mass are as follows: selecting 0.035% of C, 1.5% of Mn, 0.30% of P, 0.025% of S, 0.08% of Si, 0.65% of Ni, 25% of Cr, 0.2% of N, 0.3% of Re and 71.91% of Fe, and weighing according to the mass percentage sum of 1;
in the second step, the raw materials in the first step are added into a hearth for primary heat treatment, wherein the length of the hearth is 20m, the temperature is set to be 100-780 ℃, the temperature is increased section by section and time by time, the temperature is increased by 100 ℃ in each time period, the water is rapidly cooled after the temperature is increased, the rotating speed in the furnace is 50r/h, and the time from the feeding of the raw materials to the discharging of the raw materials is 7-8h;
in the third step, the raw materials after heat treatment are put into a closed continuous roller hearth furnace and smelted at 1500-1800 ℃ until all components are dissolved to obtain a smelting solution;
in the fourth step, the smelting liquid obtained in the third step is taken, cast ingots are forged, then the cast ingots are sent into a strip steel hot rolling mill for hot rolling to obtain extended strip steel, and homogenization annealing is carried out on the extended strip steel after the cast ingots are cast so as to continue the next operation;
in the fifth step, the band steel obtained in the fourth step is subjected to hot perforation treatment to prepare the wall of the steel pipe;
taking the wall of the steel pipe obtained in the fifth step, putting the wall into a hearth for secondary heat treatment, wherein the length of the hearth is 20m, the temperature is set to be 150-700 ℃, the temperature is increased to 100 ℃ at each time interval, the steel pipe is rapidly cooled after being heated, the rotating speed in the furnace is 70r/h, and the time from feeding the raw material into the furnace to discharging the raw material from the furnace is 6-7h;
putting the pipe wall subjected to the secondary heat treatment into a hot rolling mill, cold rolling the pipe wall by a hot rolled plate at normal temperature, and cold drawing the pipe wall subjected to the cold rolling through a wire drawing die hole to obtain a steel pipe blank;
in the eighth step, the surface treatment is carried out on the steel pipe blank obtained in the seventh step, and the surface treatment comprises the steps of cleaning surface particles by adopting compressed air and cleaning the surface of the steel pipe by using a cleaning emulsion;
in the ninth step, the steel pipe blank subjected to primary treatment in the eighth step is put into a hearth for heat treatment for three times, wherein the length of the hearth is 20m, the temperature is set to be 180-680 ℃, the steel pipe blank is heated section by section and time by time, the temperature is 100 ℃ at each time interval, the steel pipe blank is rapidly cooled by water after being heated, the rotating speed in the furnace is 80r/s, and the time from feeding the raw materials into the furnace to discharging the raw materials is 5.5-6.6 hours;
straightening the steel pipe blank subjected to the third heat treatment in the tenth step, wherein the straightening mode is roller straightening and low-temperature cold straightening is adopted, and the straightening mode comprises but is not limited to pressure straightening, tension straightening and stretch bending straightening;
performing surface finishing treatment on the straightened pipe blank in the eleventh step, wherein the surface finishing treatment comprises a surface finishing polishing process and special coating anti-oxidation treatment to obtain a finished steel pipe, and a coating formula used in the special coating anti-oxidation treatment comprises 70% of chemical and lubricating oil and 30% of an evaporating agent;
and in the twelfth step, the finished steel pipe obtained in the eleventh step is taken for performance detection, wherein the performance detection comprises size test, tensile test, hardness test, flattening test, flaring test, water pressure test, ultrasonic test, eddy current test and crystal corrosion test.
The properties of the examples are compared in the following table:
example 1 and domestic existing steel pipe properties are as follows:
based on the above, the invention determines the proportion components of the metal elements such as C, mn, P, S, si and the like again through the research on the metal elements, adjusts the harmful elements, and adds the rare earth Re, thereby thoroughly solving the industry key common problem of poor product plasticity; the invention develops a novel production process, namely weighing raw materials, carrying out primary heat treatment, smelting, forging and hot rolling, carrying out hot perforation, carrying out secondary heat treatment, carrying out cold rolling and wheel drawing, carrying out surface treatment, carrying out tertiary heat treatment, straightening, carrying out surface finishing treatment and carrying out experimental detection, and avoiding the problem of poor tolerance precision of products produced by the prior art, wherein parameters of polishing equipment in the surface finishing treatment are repeatedly adjusted, so that the polishing efficiency is finally improved by 20%, the oxidation resistance of products is greatly improved by an oxidation-resistant coating, and the oxidation resistance year is up to 6 years; the invention creates a whole set of technological parameters of heat treatment originally, and is assisted with a self-developed closed continuous roller hearth furnace to jointly form a heat treatment process, so that the compression resistance of a product reaches 620Mpa, exceeds the domestic standard by 24%, the yield strength reaches 400Mpa, exceeds the domestic standard by 40%, the hardness is 70-80hrb, exceeds the domestic standard by 17%, the elongation reaches 38%, exceeds the domestic standard by 110%, and the corrosion resistance reaches 6 years.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. A high-temperature-resistant corrosion-resistant seamless steel pipe comprises the following components in percentage by weight: C. mn, P, S, si, ni, cr, N, re and Fe, characterized in that: the weight percentage of each component is as follows: 0.035% of C, 1.5% of Mn, 0.30% of P, 0.025% of S, 0.08% of Si, less than or equal to 0.75% of Ni, 23-25% of Cr, 0.2% of N, 0.3% of Re and the balance of Fe.
2. The high temperature and corrosion resistant seamless steel tube of claim 1, wherein: the weight percentage of each component is as follows: 0.035% C, 1.5% Mn, 0.30% P, 0.025% S, 0.08% Si, 0.75% Ni, 23% Cr, 0.2% N, 0.3% Re, and 73.81% Fe.
3. A preparation method of a high-temperature-resistant corrosion-resistant seamless steel tube comprises the following steps of firstly, weighing raw materials; step two, primary heat treatment; step three, smelting; step four, forging and hot rolling; step five, hot perforation; step six, secondary heat treatment; step seven, cold rolling and drawing; step eight, surface treatment; step nine, heat treatment is carried out for three times; step ten, straightening; step eleven, performing surface finishing treatment; step twelve, detecting in an experiment; the method is characterized in that:
in the first step, the components in percentage by mass are as follows: selecting 0.035% of C, 1.5% of Mn, 0.30% of P, 0.025% of S, 0.08% of Si, 0.75% of Ni, 23% of Cr, 0.2% of N, 0.3% of Re and 73.81% of Fe, and weighing according to the mass percentage sum of 1;
in the second step, all the raw materials in the first step are added into a hearth to carry out primary heat treatment;
in the third step, the raw materials after heat treatment are put into a closed continuous roller hearth furnace and smelted at 1500-1800 ℃ until all components are dissolved to obtain a smelting solution;
in the fourth step, the smelting liquid obtained in the third step is taken, cast ingot forging is carried out, and then the cast ingot forging is sent into a strip steel hot rolling mill for hot rolling to obtain an extended strip steel;
in the fifth step, the band steel obtained in the fourth step is subjected to hot perforation treatment to prepare the wall of the steel pipe;
taking the pipe wall of the steel pipe obtained in the fifth step, and putting the pipe wall into a hearth for secondary heat treatment;
putting the pipe wall subjected to the secondary heat treatment into a hot rolling mill, cold rolling the pipe wall by a hot rolled plate at normal temperature, and cold drawing the pipe wall subjected to the cold rolling through a wire drawing die hole to obtain a steel pipe blank;
in the eighth step, the surface treatment is carried out on the steel pipe blank obtained in the seventh step, and the surface treatment comprises the steps of cleaning surface particles by adopting compressed air and cleaning the surface of the steel pipe by using a cleaning emulsion;
in the ninth step, the steel pipe blank subjected to primary treatment in the eighth step is put into a hearth for heat treatment for three times;
straightening the steel pipe blank subjected to the third heat treatment in the tenth step by adopting a roller straightening mode and low-temperature cold straightening;
performing surface finishing treatment on the straightened pipe blank in the eleventh step, wherein the surface finishing treatment comprises a surface finishing polishing process and special coating anti-oxidation treatment to obtain a finished steel pipe;
and in the twelfth step, the finished steel pipe obtained in the eleventh step is taken for performance detection, wherein the performance detection comprises size test, tensile test, hardness test, flattening test, flaring test, water pressure test, ultrasonic test, eddy current test and crystal corrosion test.
4. The method for preparing the high temperature and corrosion resistant seamless steel tube according to claim 3, wherein the method comprises the following steps: in the second step, the length of the hearth is 20m, the temperature is set to be 100-780 ℃, the temperature is increased section by section and time by time, the temperature is increased by 100 ℃ in each time interval, the water is rapidly cooled after the temperature is increased, the rotating speed in the furnace is 50r/h, and the time from the charging to the discharging of the raw materials is 7-8h.
5. The method for preparing the high temperature and corrosion resistant seamless steel tube according to claim 3, wherein the method comprises the following steps: in the fourth step, homogenization annealing is carried out on the ingot after the ingot casting, and the next operation can be continued.
6. The method for preparing the high temperature and corrosion resistant seamless steel tube according to claim 3, wherein the method comprises the following steps: in the sixth step, the length of the hearth is 20m, the temperature is set to be 150-700 ℃, the temperature is started to be 100 ℃ in each time period, the water is rapidly cooled after the temperature is raised, the rotating speed in the furnace is 70r/h, and the time from the feeding of the raw materials to the discharging of the raw materials is 6-7h.
7. The method for preparing the high temperature and corrosion resistant seamless steel tube according to claim 3, wherein the method comprises the following steps: in the ninth step, the length of the hearth is 20m, the temperature is set to be 180-680 ℃, the temperature is increased section by section and time by time, the temperature is increased by 100 ℃ in each time interval, the water is rapidly cooled after the temperature is increased, the rotating speed in the furnace is 80r/s, and the time from the charging of the raw materials to the discharging of the raw materials is 5.5-6.6h.
8. The method for preparing the high-temperature-resistant and corrosion-resistant seamless steel tube according to claim 3, wherein the method comprises the following steps: in the step ten, straightening modes include but are not limited to pressure straightening, tension straightening and stretch bending straightening.
9. The method for preparing the high temperature and corrosion resistant seamless steel tube according to claim 3, wherein the method comprises the following steps: in the eleventh step, the coating formula used for the special coating anti-oxidation treatment comprises 70% of chemical and lubricating oil and 30% of evaporating agent.
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| CN117046916A (en) * | 2023-08-11 | 2023-11-14 | 江苏鸿科金属科技有限公司 | High-corrosion-resistance stainless steel tube for nuclear power and processing technology thereof |
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