CN115074504A - Method for manufacturing large-caliber thick-wall seamless steel pipe of 630 ℃ ultra-supercritical unit G115 - Google Patents
Method for manufacturing large-caliber thick-wall seamless steel pipe of 630 ℃ ultra-supercritical unit G115 Download PDFInfo
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- CN115074504A CN115074504A CN202210833644.3A CN202210833644A CN115074504A CN 115074504 A CN115074504 A CN 115074504A CN 202210833644 A CN202210833644 A CN 202210833644A CN 115074504 A CN115074504 A CN 115074504A
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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
- 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
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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Abstract
The invention relates to a method for manufacturing a large-caliber thick-wall seamless steel pipe of a 630 ℃ ultra-supercritical unit G115, belonging to the field of manufacturing of heat-resistant steel pipes. Aiming at the problem of insufficient impact toughness which is troubled for the production of G115 large-caliber thick-wall seamless steel pipes for a long time, the invention organically combines the processes of raw material (forging stock/steel ingot) preparation, closed upsetting, backward extrusion punching, extrusion forming, post-extrusion heat treatment (rapid cooling and annealing) and performance heat treatment, breaks through the process parameters of the CN103045962B patent, greatly improves the impact toughness of the steel pipes after heat treatment, and meets the standard requirements of T/CISA 003-2017 in various performances. The invention can be used for producing G115 large-caliber thick-wall seamless steel pipes with different specifications of 325-1200mm external diameter, 20-180mm wall thickness and less than or equal to 12500mm length, and can be applied to different fields of advanced ultra-supercritical boilers, four large pipelines of power stations and the like. And the steel ingot is used as a raw material, so that the production cost can be greatly saved.
Description
The present application is a patent application No.: 201810748433.3, name: a manufacturing method of a 630 ℃ ultra supercritical unit G115 large-caliber thick-wall seamless steel pipe is disclosed in the application date: 10/07/2018, divisional application of patent application.
Technical Field
The invention relates to a method for manufacturing a seamless steel pipe, in particular to a method for manufacturing a large-caliber thick-wall seamless steel pipe of a 630 ℃ ultra-supercritical unit G115.
Background
With the advancement of human beings in the 2l century, energy conservation and environmental protection have become two major topics of development of modern industry. Under the guidance of establishing a call in beautiful China, China is in the forefront of the world in the aspect of improving the thermal efficiency of a thermal power generating unit by adopting a method for improving steam parameters. The main bottleneck problem restricting the development of the thermal power generating unit to high parameters is a heat-resistant material, and the large-diameter boiler pipe and the header are the bottleneck problem in the bottleneck. Under the guidance of a 'multi-element composite reinforcement' theory, the steel research institute combines the research foundation of MARBN steel, adds precipitation type element Cu to further improve the strength, fully exerts B metallurgical reinforcement effect, further improves the strength and toughness of a crystal boundary at high temperature, controls Ni and Al, controls the proportion between B and N elements and other technical measures, and invents G115 steel (patent number CN 103045962B). The patent also discloses a hot working process and a heat treatment process system. Patent literature shows that: the G115 steel produced according to the optimal component design, the optimal processing technology and the optimal heat treatment technology has room temperature mechanical property, impact property, high temperature mechanical property and durability which are all higher than those of P92 steel in GB5310 and ASME standard and also higher than the durability strength (reported in literature value) of MARBN steel pipe invented by Abe et al in Japan. The high-temperature plasticity of the G115 steel is lower than that of the P92 steel, and the heating temperature of hot working given by CN103045962B is 1160-1180 +/-10 ℃ so as to avoid cracking in the hot working process.
Since 2016, G115 steel large-diameter pipes were developed industrially in northern heavy industry, Baote steels, and other units, and the pipe blanks were well formed by punching at a heating temperature of 1140. + -.10 ℃ and extruding at a temperature of 1170. + -.10 ℃, but the impact toughness after heat treatment was only about 20J. The low impact toughness becomes a key technical problem in the industrialization of G115 large-caliber thick-wall seamless steel pipes. Meanwhile, some studies on G115 steel have been carried out by domestic related units, and some documents have been published, for example, the effects of normalizing temperature on the structure and room temperature strength of G115 steel (vol.1 of proceedings on thermal processing of materials), which have not been concerned about how to improve impact properties, have been studied on the effects of normalizing temperature on the structure and room temperature strength of G115 steel.
Aiming at the problem of low industrialized impact performance of the G115 large-caliber pipe, the company develops the research on the relation between the G115 deformation temperature and the impact toughness, combines long-term accumulated technical experiences to carry out process system innovation, greatly improves the impact toughness of the steel pipe after heat treatment under the condition of ensuring the good surface of the pipe blank, meets the requirements of T/CISA 003-2017 standards on various performances, and breaks through the bottleneck of key materials of 630 ℃ advanced ultra-supercritical units in China.
Disclosure of Invention
The invention aims to provide a method for manufacturing a large-caliber thick-wall seamless steel pipe of a 630 ℃ ultra-supercritical unit G115, which greatly improves the impact toughness of the steel pipe after heat treatment and ensures that all properties meet the requirements of T/CISA 003-2017 standards.
The technical solution is as follows:
the method for manufacturing the large-caliber thick-wall seamless steel tube of the 630 ℃ advanced ultra-supercritical unit G115 comprises the following steps:
1) preparation of raw materials (forgings/ingots)
Preparing raw materials (forged blank/steel ingot) according to the patent CN 103045962B;
2) closed upsetting and backward extruding punching
Heating the forging stock (steel ingot) to 1140 +/-10 ℃, and soaking; removing surface oxide skin, spraying glass lubricant, performing closed upsetting on a blank making press, wherein the upsetting ratio is more than or equal to 1.3, performing backward extrusion punching, and the perforation ratio is more than or equal to 1.1 to prepare a hollow blank;
3) extrusion molding
Heating the hollow blank to 1240 +/-10 ℃, removing surface oxide skin, returning to the furnace for flushing for 30min, discharging from the furnace, spraying a glass lubricant, extruding the hollow blank into a tube blank on an extruder, wherein the extrusion speed is 15-30mm/s, and the extrusion ratio is more than or equal to 6;
4) post extrusion rapid cooling and annealing
The extruded tube blank is directly cooled by water, and the temperature of the outer surface of the tube blank is less than or equal to 350 ℃. Then, furnace annealing: annealing temperature 780 +/-10 ℃, temperature equalizing time 1-2 hours, heat preservation time 3-6 hours (calculated according to the wall thickness of not less than 2 min/mm), discharging and air cooling to room temperature.
5) Property heat treatment
The performance heat treatment is normalizing and tempering, and quenching and tempering can also be adopted.
Adopting a normalizing and tempering heat treatment mode: austenitizing at 1070 +/-10 ℃, keeping the temperature for 3 hours, keeping the temperature for 4 hours, and then cooling by air (the temperature can be calculated according to the size specification of the pipeline and the wall thickness of not less than 2 min/mm); and (3) cooling to room temperature, then tempering, wherein the tempering temperature is 780 +/-10 ℃, keeping the temperature for 3 hours, keeping the temperature for 4 hours, and then air cooling (the heat preservation time can be adjusted according to the size specification of the pipeline, and the calculation is carried out according to the wall thickness of not less than 2 min/mm).
Adopting a quenching and tempering heat treatment mode: austenitizing at 1070 +/-10 deg.c for 3 hr, maintaining for 4 hr, and water cooling (calculated in the thickness of pipe wall of not less than 2 min/mm); and (3) cooling to room temperature, then tempering, wherein the tempering temperature is 790 +/-10 ℃, keeping the temperature for 3 hours, keeping the temperature for 4 hours, and then air cooling (the heat preservation time can be adjusted according to the size specification of the pipeline, and the calculation is carried out according to the wall thickness of not less than 2 min/mm).
The invention organically combines the forging stock/steel ingot raw material through closed upsetting, backward extrusion punching, extrusion forming, heat treatment after extrusion (fast cooling and annealing) and performance heat treatment processes, breaks through the process parameters of the CN103045962B patent, and greatly improves the impact toughness of the steel pipe after heat treatment. Solves the problem of insufficient impact toughness which is puzzled for a long time in the production of G115 large-caliber thick-wall seamless steel pipes.
The method can be used for producing G115 large-caliber thick-wall seamless steel tubes with different specifications of 325-plus 1200mm outer diameter, 20-180mm wall thickness and less than or equal to 12500mm length, and can be applied to different fields of ultra-supercritical boilers, four large pipelines of power stations and the like. And the steel ingot is used as a raw material, so that the production cost can be greatly saved.
Drawings
FIG. 1 is a block diagram of the process flow of the present invention;
FIG. 2 is a microstructure of the finished product of the present invention;
FIG. 3 is a grain size diagram of the finished product of the present invention;
FIG. 4 is a microstructure diagram of a small sample cut and heat treated after annealing of the extruded G115 large caliber thick wall tube blank of the present invention;
FIG. 5 is a grain size diagram of a small sample cut after annealing of the G115 large-diameter thick-walled tube blank extruded in accordance with the present invention.
Detailed Description
The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.
Example 1:
specification of a finished steel pipe: 540mm × 70mm × 5000mm
1. Preparation of raw materials (forged billet/ingot)
According to the patent CN103045962B, a blank/ingot is prepared, and the ingot weighs 10 tons.
2. And heating the steel ingot to 1140 +/-10 ℃ by adopting a gas heating furnace.
3. Closed upsetting and backward extruding punching
Removing oxide skin on the surface of the steel ingot, spraying a glass lubricant on the surface, performing closed upsetting in a blank making press with the upsetting ratio of 1.56, performing backward extrusion punching with the punching ratio of 1.1, and preparing the hollow blank.
4. Extrusion molding
Heating the hollow blank to 1240 +/-10 ℃, removing oxide skin on the surface of the hollow blank, returning to the furnace, punching for 0.5 hour to make up for the surface temperature loss of the hollow blank, spraying a glass lubricant, extruding the hollow blank into a tube blank on an extruder, wherein the extrusion speed is 20mm/s, and the extrusion ratio is 6.2.
5. Post extrusion rapid cooling and annealing
The extruded tube blank is directly cooled by spraying water inside and outside, and the rotating linear speed of the steel tube is as follows: 26mm/s, water spray pressure: 2.2bar, flow: 340m 3 H, the cooling time is 10min, and the outer surface temperature of the tube blank after cooling is 280 ℃. And then, furnace annealing: annealing temperature 780 +/-10 ℃, temperature equalizing time 1 hour, heat preservation time 4 hours, discharging and air cooling to room temperature.
6. Property heat treatment
The heat treatment adopts a normalizing and tempering mode, the normalizing temperature is 1070 +/-10 ℃, the temperature is equalized for 3 hours and is kept for 4 hours, and the tube blank is taken out of the furnace and cooled in air.
Tempering temperature is 780 +/-10 ℃, temperature equalization is carried out for 3 hours, heat preservation is carried out for 4 hours, and then air cooling is carried out.
7. Straightening
The plates were straightened out on a 2500 ton press and the full length was 4mm curved.
8. Physical and chemical detection
8.1 mechanical Properties (transverse)
8.2.2 metallographic structure: tempering martensite; prior austenite grain size: 2.5 grade;
8.2.3 non-metallic inclusions
9. Finishing
The steel pipe is processed to have the external diameter phi of 540 plus 5-2mm and the wall thickness of 70 plus or minus 7mm by turning and boring processes.
10. Nondestructive testing
Carrying out ultrasonic detection according to GB/T5777-2008L 2 grade, and obtaining qualified products;
carrying out magnetic powder detection according to JB/T4730.4 to obtain qualified product;
and carrying out eddy current detection according to GB/T7735-2016B grade, and obtaining the qualified product.
11. Hydrostatic test
And (4) calculating according to a test pressure formula P which is 2SR/D, carrying out a hydraulic test according to the maximum test pressure of 20MPa, keeping the pressure for 10s, avoiding the leakage phenomenon and ensuring that the test is qualified.
12. Size and appearance inspection
And (5) carrying out size and appearance detection on the steel pipes one by one. The external dimension of the steel tube is measured by a vernier caliper, the external dimensions of the two ends of the steel tube are phi 540.5-phi 541.2mm, the measured wall thickness dimension is 71.5-72.1 mm, and the length is 6800 mm.
The surface quality of the steel pipe is checked by a visual method, and the steel pipe has no crack, folding and scabbing defects
13. Spraying label to put in storage
The marks of the steel pipes are sprayed, and the mark of each steel pipe is 300mm away from the tail end of the steel pipe ingot and comprises the grade of the steel pipe material, the furnace number, the ingot number and the nominal size.
Example 2
Example 1 other method steps are unchanged, the performance heat treatment in step 6, and the quenching and tempering mode is adopted to realize the invention.
Quenching temperature: at 1070 +/-10 deg.c, homogenizing for 3 hr, maintaining for 4 hr, water cooling, cooling to room temperature and tempering.
Tempering temperature: keeping the temperature at 790 +/-10 ℃ for 3 hours and keeping the temperature for 4 hours, and then cooling in air.
It should be understood that the above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and the present invention should be covered thereby. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (3)
1. A method for manufacturing a 630 ℃ ultra supercritical unit G115 large-caliber thick-wall seamless steel pipe is characterized by comprising the following steps:
preparing a forging stock/steel ingot raw material, performing closed upsetting and backward extrusion punching, performing extrusion forming, performing rapid cooling and annealing heat treatment after extrusion, and performing performance heat treatment;
the heating temperature of closed upsetting and backward extrusion punching is 1140 +/-10 ℃; removing surface oxide skin, spraying a glass lubricant, performing closed upsetting on a blank making press, performing backward extrusion punching, and forming a hollow blank, wherein the upsetting ratio is not less than 1.3, and the punching ratio is not less than 1.1;
extrusion forming heating temperature is 1240 +/-10 ℃, surface oxide skin is removed, furnace returning and punching are carried out for 30min, the blank is discharged from a furnace and sprayed with a glass lubricant, then the hollow blank is extruded into a tube blank on an extruder, the extrusion speed is 15-30mm/s, the extrusion ratio is more than or equal to 6, and the extrusion speed is 15-30 mm/s;
the tube blank is subjected to rapid cooling, annealing and performance heat treatment after extrusion to form the G115 large-caliber thick-wall seamless steel tube, the outer diameter of the G115 large-caliber thick-wall seamless steel tube is 325-1200mm, the wall thickness is 20-180mm, and the length is less than or equal to 12500 mm.
2. The manufacturing method of the 630 ℃ ultra supercritical unit G115 large-caliber thick-wall seamless steel tube is characterized in that in the process of extrusion and rapid cooling plus annealing, the rapid cooling system is as follows: directly cooling the extruded tube blank by water, wherein the temperature of the outer surface of the tube blank is less than or equal to 350 ℃; an annealing system: and (3) annealing in a furnace after quick cooling, wherein the heating temperature is 780 +/-10 ℃, the temperature equalizing time is 1-2 hours, the heat preservation time is adjusted according to the wall thickness, and is calculated according to the wall thickness of not less than 2min/mm, and the heat preservation time is as follows: and discharging the product from the furnace and cooling the product to room temperature after 3 to 6 hours.
3. The method for manufacturing the 630 ℃ ultra supercritical unit G115 large-caliber thick-wall seamless steel pipe according to the claim 1 is characterized in that the performance heat treatment is normalizing and tempering or quenching and tempering; normalizing and tempering heat treatment system: austenitizing normalizing temperature: air cooling at 1070 +/-10 ℃ after temperature equalization for 3 hours and heat preservation for 4 hours, tempering after cooling to room temperature, adjusting the temperature according to the wall thickness size, and calculating according to the wall thickness of not less than 2min/mm, wherein the tempering temperature is 780 +/-10 ℃, the temperature equalization for 3 hours and the heat preservation for 4 hours are air cooling; quenching and tempering heat treatment system: austenitizing quenching temperature: and at 1070 +/-10 ℃, carrying out temperature equalization for 3 hours and heat preservation for 4 hours, then carrying out water cooling, cooling to room temperature, then carrying out tempering, wherein the tempering temperature is 790 +/-10 ℃, carrying out heat preservation for 3 hours and heat preservation for 4 hours, then carrying out air cooling, and the heat preservation time is adjusted according to the wall thickness and is calculated according to the wall thickness of not less than 2 min/mm.
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| CN201810748433.3A CN108998650B (en) | 2018-07-10 | 2018-07-10 | Method for manufacturing large-caliber thick-wall seamless steel pipe of 630 ℃ ultra-supercritical unit G115 |
| CN202210833644.3A CN115074504B (en) | 2018-07-10 | 2018-07-10 | Manufacturing method of 630 ℃ ultra-supercritical unit G115 large-caliber thick-wall seamless steel tube |
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| CN110614289A (en) * | 2019-09-30 | 2019-12-27 | 内蒙古北方重工业集团有限公司 | Slow cooling method for large-scale extruded thick-wall blank made of Ni-Cu alloy heat-resistant steel |
| CN111057830A (en) * | 2019-12-09 | 2020-04-24 | 河北亚都管道装备集团有限公司 | Method for manufacturing large-caliber thick-wall seamless hot-pressing reducing pipe of 630 ℃ ultra-supercritical unit G115 and reducing pipe |
| CN113681237A (en) * | 2021-08-12 | 2021-11-23 | 内蒙古北方重工业集团有限公司 | Continuous friction weak standard welding method for ultrahigh-strength steel large-scale workpiece |
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| CN115074504B (en) | 2023-07-14 |
| CN108998650B (en) | 2023-02-28 |
| CN108998650A (en) | 2018-12-14 |
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