CN117025916A - Production method of 9Cr thick-wall stainless steel seamless steel pipe with yield strength of 110 steel grade - Google Patents
Production method of 9Cr thick-wall stainless steel seamless steel pipe with yield strength of 110 steel grade Download PDFInfo
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- CN117025916A CN117025916A CN202310965801.0A CN202310965801A CN117025916A CN 117025916 A CN117025916 A CN 117025916A CN 202310965801 A CN202310965801 A CN 202310965801A CN 117025916 A CN117025916 A CN 117025916A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 186
- 239000010959 steel Substances 0.000 title claims abstract description 186
- 239000010935 stainless steel Substances 0.000 title claims abstract description 35
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
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- 238000000034 method Methods 0.000 claims abstract description 41
- 230000000171 quenching effect Effects 0.000 claims abstract description 41
- 230000008569 process Effects 0.000 claims abstract description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000007670 refining Methods 0.000 claims abstract description 23
- 238000000137 annealing Methods 0.000 claims abstract description 20
- 238000009749 continuous casting Methods 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000012545 processing Methods 0.000 claims abstract description 12
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 12
- 238000010891 electric arc Methods 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 238000004512 die casting Methods 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 72
- 239000011521 glass Substances 0.000 claims description 20
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- 238000005242 forging Methods 0.000 claims description 11
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- 238000005496 tempering Methods 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 239000000314 lubricant Substances 0.000 claims description 8
- 230000001050 lubricating effect Effects 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000011575 calcium Substances 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 4
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 4
- 239000000378 calcium silicate Substances 0.000 claims description 4
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
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- 238000007654 immersion Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 239000008188 pellet Substances 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
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- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- 229910052717 sulfur Inorganic materials 0.000 description 1
Classifications
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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
-
- 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
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/085—Making tubes
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a production method of a 9Cr thick-wall stainless steel seamless steel pipe with yield strength of 110 steel grade, which comprises the following steps: the method comprises the steps of blank preparation, blank annealing, blank processing, extrusion molding, annealing treatment, quenching treatment by two liquid and self-stressing treatment. Wherein the blank preparation includes: (1) molten iron pretreatment, (2) electric arc furnace smelting, (3) external refining, (4) vacuum degassing, and (5) continuous casting or rolling or die casting to produce round billets. Extrusion molding comprises a reaming process, an extrusion process and a cooling process. The invention improves the mechanical property of the 9Cr seamless steel tube, solves the problems of serious water quenching cracks and oil quenching smoke, low yield and poor performance of the prior art, is beneficial to improving the yield and the product quality of the 9Cr thick-wall stainless steel seamless steel tube with 110 steel grade of yield strength, and reduces the production cost.
Description
Technical Field
The invention belongs to the technical field of industrial equipment production, and relates to a production method of a 9Cr thick-wall stainless steel seamless pipe with 110 steel grade yield strength.
Background
With the reduction of resources of the easily-extracted oil and gas field, people start to switch to the extraction of the oil and gas field under the severe conditions of high temperature, high pressure, high mineralization and corrosiveness, the common carbon steel pipe can not meet the use requirements, and the oil and gas well is stopped due to corrosion, so that a large number of scrapping accidents are caused, and great economic loss is caused. The dual-phase steel, the nickel-based alloy and other high alloy performances are excellent, but the cost is high, and the 9Cr has excellent mechanical property and corrosion resistance after heat treatment, is economical, is widely applied to the production field of petroleum machinery equipment and pipes, and has good development prospect. The 9Cr steel has good CO resistance 2 Corrosiveness and excellent toughness, and is very suitable for high-temperature high-CO 2 Partial pressure and trace H 2 In the corrosive environment with S content, the comprehensive performance is superior to that of common L80-13Cr, and the steel is currently the main steel for the oil-gas field exploitation environmentThe material is required. The current mature production process of the L80-9Cr steel pipe comprises the following steps: ingot casting, forging stock, blank processing, hot piercing, rolling and forming, tempering and the like, the steel pipe is easy to have the defects of rolling, cracking and the like, and the yield is low.
As the working conditions become complex, the common low steel grade L80-9Cr is difficult to bear complex high stress, and the material is required to have higher strength performance and good impact toughness. Under the condition of unchanged material composition, L80-9Cr can be quenched and tempered to 110 steel grade by reducing the tempering temperature. However, at this time, the plasticity and toughness are greatly reduced, the brittleness is extremely high, the cracking is extremely easy, and the use cannot be performed. The method has the advantages that component optimization is needed to be fundamentally carried out, the factors influencing the strength, the impact toughness and the corrosion resistance are combined, the chemical components and the production process of the 110 steel grade with higher strength are researched, the higher impact energy is considered under the high-strength condition, the quality of the steel pipe is improved, and the method has important significance in overcoming the technology.
Disclosure of Invention
The invention aims to provide a production method of a 9Cr thick-wall stainless steel seamless steel pipe with yield strength of 110 steel grade, which improves the strength and toughness of the steel for the stainless steel seamless steel pipe and is used for manufacturing oil and gas field exploitation equipment containing carbon dioxide.
The technical scheme of the invention is as follows: the production method of the 9Cr thick-wall stainless steel seamless steel pipe with the yield strength of 110 steel grade comprises the following steps:
smelting molten steel by an arc furnace, external refining and vacuum degassing process by taking molten iron as a raw material, producing a 9Cr initial raw material by continuous casting or rolling or die casting, and forging a round blank;
secondly, annealing the blank, namely heating the round blank to 800-860 ℃ in a chamber type heating furnace for annealing, and uniformly organizing to reduce the hardness;
thirdly, processing the blank, and cutting the annealed round blank; then, 5-10 mm of the outer circle is processed on one side, a through hole with the diameter of 30-90 mm is processed in the center, and the oxide skin on the outer surface and the center of the inside are removed to be loose and cracked;
extruding and forming, namely extruding the steel pipe by using a 6300T horizontal extruder unit to obtain a finished steel pipe, wherein the extruding and forming comprises a reaming process, an extruding process and a cooling process;
fifthly, annealing, heating the steel pipe to 840-870 ℃, preserving heat, cooling to below 500 ℃ in a furnace, and cooling to room temperature in an air cooling way;
performing double-liquid quenching treatment, namely heating a steel pipe to 950-980 ℃, preserving heat for 90-150 min, immersing in water for rapid cooling, rapidly transferring the steel pipe into oil when the temperature of the steel pipe reaches 200-400 ℃, cooling to below 80 ℃, and air cooling to room temperature;
tempering, namely heating the steel pipe to 560-600 ℃, preserving heat for 200-300 min, and cooling the steel pipe to room temperature by water;
straightening the finished product by adopting a pressure straightening mode;
the production method of the 9Cr thick-wall stainless steel seamless steel pipe with 110 steel grade yield strength is obtained by heating the steel pipe to 500-550 ℃, preserving heat for 120-180 min and air cooling to room temperature.
The steel for the seamless steel pipe comprises the following components in percentage by mass: c:0.10 to 0.16, si:0.40 to 1.20, mn:0.40 to 0.90, P: less than or equal to 0.020, S: less than or equal to 0.006, cr:8.5 to 10.5, ni:0.20 to 0.50, mo:0.92 to 1.15, nb: 0.02-0.06, V:0.05 to 0.10, al:0.01 to 0.05, ca:0.0003 to 0.02 percent, cu: less than or equal to 0.25, N: less than or equal to 0.050, O: less than or equal to 0.0040, H: less than or equal to 0.0004, and the balance of Fe and unavoidable impurities.
The blank preparation process comprises the following steps: (1) and (3) pretreating molten iron, wherein the molten iron is heated to 1250-1300 ℃, and P and S in the molten iron are less than or equal to 0.08 and less than or equal to 0.10 (in mass percent). (2) Smelting in an electric arc furnace, wherein the temperature of the electric arc furnace is 1650 ℃, the tapping temperature is more than or equal to 1635 ℃, C is more than or equal to 0.06, and P is less than or equal to 0.008 (mass percent). (3) Refining in a refining furnace, wherein the quantity of lime is adjusted to be 250 kg/t-300 kg/furnace in the external refining process, the deoxidation and the desulfurization are enhanced in the early refining stage according to slag conditions, the fluorite adjustment quantity is less than or equal to 1.5kg/t according to slag conditions, the white slag time is 20-60 min, aluminum wires are fed when the aluminum wires are discharged, the aluminum wires are controlled according to the Alt component mass percentage of 0.010-0.045%, and the tapping temperature is more than or equal to 1600 ℃. (4) Vacuum degassing, keeping the vacuum degree below 67Pa for 20-35 min, closing argon tightly in the pressure maintaining process, stirring for 1-2 min for sampling analysis after breaking, adding a calcium silicate wire, and adding Ca/Al mass ratio: and controlling the temperature of the molten steel to be between 1500 and 1570 ℃ at 0.12 and 0.25. (5) Preparing a round billet by continuous casting or rolling or die casting to produce a 9Cr starting material, wherein continuous casting or rolling directly produces a round billet, and die casting material forges the round billet.
The compression ratio of the rolled round billet is 3.0-10.0. The die casting is required to produce round blanks through forging procedures, the initial forging temperature is 1050-1100 ℃, the final forging temperature is not lower than 900-920 ℃, the finishing temperature is 800-880 ℃, the reduction of each pass is 15-80 mm, the feeding amount is 50-150 mm, and the final heat deformation amount is more than 15%.
In the reaming process, the cold blank is heated for 4 times in a primary electromagnetic induction furnace. The heating power of the 1 st time is 350KW, and the surface temperature of the blank is 800-900 ℃. The heating power of the 2 nd heating is 500KW, and the surface temperature is 1000-1050 ℃. The heating power of the 3 rd and 4 th times is 600 KW-900 KW, the surface temperature of the blank is 1140 ℃ to 1200 ℃, and the heating is completed. Sequentially removing phosphorus by high-pressure water, uniformly coating glass powder lubricant on the inner surface and the outer surface, placing the blank into a reaming barrel, and placing lubricating glass pellets at the bell mouth of the blank. And (3) reaming by using a 2500T vertical reamer, wherein the outer diameter of the blank is 5-10 mm smaller than the inner diameter of a reaming barrel, the reaming barrel is preheated to 100-200 ℃, the reaming speed is 150-250 mm/s, and the reaming ratio is 1.01-1.36.
In the extrusion process, the reamed blank is heated twice by a secondary electromagnetic induction furnace. The heating power of the 1 st heating step is 500KW, and the temperature of the blank is 1050-1100 ℃. The heating power of the 2 nd heating is 800KW, and the temperature of the blank is 1140-1200 ℃. Performing high-pressure water descaling under 18-23 MPa, uniformly smearing glass powder lubricant on the inner and outer surfaces, placing a lubricating glass pad at the front end of the extrusion die, wherein the inner cavity of the glass pad is 20-40 mm larger than the inner cavity of the extrusion die; extruding with 6300T horizontal extruder, the expanded blank has diameter smaller than the inner diameter of the extruding barrel by 4-10 mm, the extruding barrel is preheated to 260-450 deg.c and extruding speed of 200-350 mm/s and extruding ratio of 5-15.
The process of the double-liquid quenching treatment is as follows: (1) and (3) conveying the steel pipe into a quenching furnace, heating to 950-980 ℃, preserving heat for min, and immediately discharging after finishing heat preservation. (2) The steel pipe is quickly transferred to a rotary riding wheel in a water tank filled with circulating water, the rotating speed of the riding wheel is 30-40 rpm, the distance between each pair of towing wheels is 0.8-1.6 m, the steel pipe is driven by the towing wheels to rotate, an inner nozzle arranged at one end of the steel pipe is opened, the inner diameter of the inner nozzle is 25-50 mm smaller than that of the steel pipe, and inner water spray is axially sprayed into an inner hole of the steel pipe. (3) After the internal water spray cooling is carried out for 5-10 s, the whole rotary riding wheel device sinks, so that the diameter direction of the steel pipe is immersed below 200mm of the water surface, and the steel pipe is continuously cooled under the simultaneous actions of internal water spray and immersion. (4) When the temperature of the steel pipe is cooled to 200-400 ℃, the rotary riding wheel device is integrally lifted to enable the steel pipe to leave the water surface. (5) And rapidly transferring the water quenched steel pipe to a fixed support in a cooling oil groove, and using quenching oil as a cooling medium to reduce quenching stress and avoid cracks. (6) Cooling the steel pipe to below 80 ℃ and ending quenching.
In blank processing, a head is processed into a bullnose with the radius of R35mm, the internal and external circles are processed, polished and polished, the surface roughness Ra is less than or equal to 3.2 mu m, the diameter deviation is +/-1.0 mm, the length deviation is +/-10 mm, the flat end faces at two ends are 90 degrees, and the horn mouth angle of the head is 41-46 degrees.
The seamless steel pipe has the properties that the tensile strength is not less than 880MPa, the yield strength of Rp0.2 is 758-950 MPa, the elongation is not less than 15%, the area shrinkage is not less than 40%, the hardness is 275-320 HBW, and the full-size impact energy of a transverse Charpy V-shaped notch at-10 ℃ is not less than 25J.
The standard requirement of P110 steel grade is that the tensile strength is larger than or equal to 862Mpa, the yield strength is 758-965 Mpa, and the elongation is more than 15%. The base body is tempered sorbite by using a quenching and high-temperature tempering method.
The invention produces the 9Cr thick-wall stainless steel seamless steel pipe with 110 steel grade yield strength by optimizing the components of the blank, smelting in an electric arc furnace, forming continuous casting blanks or rolling blanks or casting ingots by a hot extrusion process, and combining water and oil double-liquid quenching heat treatment, improves the mechanical property of the 9Cr seamless steel pipe, overcomes the problems of serious water quenching cracks, serious oil quenching smoke, low yield and poor performance in the prior art, and is beneficial to improving the yield and the product quality of the 9Cr thick-wall stainless steel seamless steel pipe with 110 steel grade yield strength and reducing the production cost. The seamless steel pipe produced by the invention has good surface quality, high mechanical property after water-oil double-liquid quenching heat treatment, higher strength and good toughness.
Drawings
FIG. 1 is a schematic flow chart of a production device for a 9Cr thick-wall stainless steel seamless steel pipe with 110 steel grade yield strength;
FIG. 2 is a schematic process flow diagram of a 9Cr thick-walled stainless steel seamless steel pipe with a 110 steel grade yield strength;
FIG. 3 is a schematic view of the structure of a round blank;
FIG. 4 is a schematic view of the reamer;
FIG. 5 is a schematic view of the structure of the extruder;
FIG. 6 is a schematic diagram of a quenching cooling water tank structure;
fig. 7 is a schematic diagram of a quench cooling sump structure.
Wherein: 1-arc furnace, 2-refining furnace, 3-vacuum degassing furnace, 4-forging mill, 5-billet annealing furnace, 6-billet processing equipment, 7-primary electromagnetic induction heating furnace, 8-reamer, 9-secondary electromagnetic induction heating furnace, 10-extruder, 11-steel tube annealing furnace, 12-quenching furnace, 13-cooling water tank, 14-cooling oil tank, 15-tempering furnace, 16-straightener, 17-ejection mechanism, 18-reaming barrel base, 19-shear ring support, 20-shear ring, 21-reaming barrel, 22-reaming rod, 23-reaming head, 24-die holder, 25-extrusion die, 26-die support, 27-extrusion barrel liner, 28-extrusion barrel intermediate layer, 29-extrusion barrel jacket, 30-mandrel, 31-extrusion pad, 32-extrusion rod, 33-inner nozzle, 34-rotating supporting wheel, 35-circulating water, 36-water tank, 37-fixed support, 38-quenching oil, 39-stirring device, 40-oil tank, 41-billet, 42-steel tube.
Detailed Description
The present invention will be described in detail with reference to examples and drawings. The scope of the invention is not limited to the examples, and any modifications within the scope of the claims are within the scope of the invention.
As shown in FIG. 1, the production device of the 110-grade 9Cr thick-wall stainless steel seamless steel tube comprises an arc furnace 1, a refining furnace 2, a vacuum degassing furnace 3, a forging mill 4, a billet annealing furnace 5, a billet processing device 6, a primary electromagnetic induction heating furnace 7, a reamer 8, a secondary electromagnetic induction heating furnace 9, an extruder 10, a steel tube annealing furnace 11, a quenching furnace 12, a cooling water tank 13, a cooling oil tank 14, a tempering furnace 15 and a straightener 16. The electric arc furnace, the refining furnace, the vacuum degassing furnace, the forging mill, the blank annealing furnace, the blank processing equipment, the primary electromagnetic induction heating furnace, the reamer, the secondary electromagnetic induction heating furnace, the extruder, the steel tube annealing furnace, the quenching furnace, the cooling water tank, the cooling oil tank, the tempering furnace and the straightener are sequentially arranged.
As shown in fig. 4, the reamer is a 2500T vertical reamer, and includes an ejector mechanism 17, a reamer barrel base 18, a shear ring support 19, a shear ring 20, a reamer barrel 21, a reamer rod 22, and a reamer head 23. The diameter of the hole-expanding rod is 5-10 mm smaller than that of the hole-expanding head, the inner diameter of the shearing ring is 1-2 mm larger than that of the hole-expanding head, and the diameter of the blank is 5-10 mm smaller than that of the hole-expanding barrel.
As shown in fig. 5, the extruder is a 6300T horizontal extruder provided with a die holder 24, an extrusion die 25, a die support 26, an extrusion barrel liner 27, an extrusion barrel intermediate layer 28, an extrusion barrel jacket 29, a mandrel 30, an extrusion pad 31, and an extrusion rod 32. The steel pipe forming die is made of H13, the die hardness is HRC 48-51, and the cavity of the die support is 20-40 mm larger than the cavity of the extrusion die.
As shown in fig. 6, the cooling water tank 36 is provided with an inner nozzle 33 and a rotary riding wheel 34. The rotating riding wheel 34 is used for horizontally placing the seamless steel pipe during cooling, and the inner nozzle 33 is used for spraying circulating water into the inner hole of the seamless steel pipe along the axial direction. The cooling water tank 36 is filled with circulating water, and the cooling water tank 36 is provided with a water outlet connected to the inner nozzle 33 by a water pump.
As shown in fig. 7, the cooling oil tank 40 is provided with a fixing bracket 37 and a stirring device 39; the fixed bracket 37 is used for horizontally placing a seamless steel pipe when oil cooling, and the stirring device 39 is used for stirring quenching oil so as to promote the quenching oil to flow in the cooling oil groove.
Example 1
A production specification of the 9Cr thick-wall stainless steel seamless steel pipe with the yield strength of 110 steel grade is that the outer diameter phi is 180mm, the wall thickness is 45mm, and the chemical compositions are shown in table 1.1:
TABLE 1 chemical composition/(mass percent) of seamless steel pipe with 180mm x 45mm phi
Remarks: the balance of Fe and unavoidable impurities.
The invention relates to a method for producing a 9Cr thick-wall stainless steel seamless steel pipe with 110 steel grade yield strength, the production process is shown in figure 2, and the method comprises the following steps:
the method comprises the steps of preparing a round continuous casting blank through an electric arc furnace, external refining, vacuum degassing and continuous casting. (1) The molten iron is pretreated, the temperature for heating the molten iron is more than 1250 ℃, and the component mass percent is less than or equal to 0.08 and less than or equal to 0.10. (2) And (3) smelting in an electric arc furnace, wherein the mass percentage of steel components is controlled to be more than or equal to 0.06, P is controlled to be less than or equal to 0.008, and the tapping temperature is controlled to be more than or equal to 1635 ℃ during the smelting in the electric arc furnace. (3) Refining in a refining furnace, wherein the temperature is more than or equal to 1535 ℃. Adding 250 kg/t-300 kg/furnace of lime during external refining, carrying out fine adjustment on the quantity according to slag conditions, carrying out enhanced deoxidation and desulfurization at the early stage of refining, adjusting the consumption of fluorite according to slag conditions to be less than or equal to 1.5kg/t, feeding aluminum wires during slag tapping, controlling the slag tapping temperature to be more than or equal to 1600 ℃ according to the mass percentage of Alt components, wherein the slag tapping time is 20 min-60 min. (4) Vacuum degassing, keeping the vacuum degree below 67Pa for 20-35 min, closing argon tightly in the pressure maintaining process, stirring for 1-2 min for sampling analysis after breaking, adding a calcium silicate wire, and adding Ca/Al mass ratio: 0.12 to 0.25. (5) The continuous casting blank is cast at the temperature of 1500-1570 ℃ to produce the round continuous casting blank 41 with the diameter phi 375mm of 9Cr through a continuous casting process.
And (3) annealing the blank, namely heating the round blank to 800-860 ℃ in a chamber type heating furnace, annealing, preserving heat for 5-10 h, cooling to 350-500 ℃ at a speed of 20-50 ℃/h, discharging and cooling to room temperature.
And thirdly, processing the blank, namely cutting the annealed round blank according to the length of the finished steel pipe, and processing the blank with the outer diameter phi 358 mm/the inner diameter phi 65mm multiplied by the length 900 mm. The head is processed into a bullnose with the radius of R35mm, the internal and external circles are processed, polished and polished, the surface roughness Ra is less than or equal to 3.2 mu m, the diameter deviation is +/-1.0 mm, the length deviation is +/-10 mm, the flat end faces at two ends are 90 degrees, and the horn mouth angle of the head is 46 degrees.
And fourthly, performing extrusion forming of the steel pipe, wherein the extrusion forming comprises a reaming process, an extrusion process and a cooling process.
(1) And (3) reaming, namely heating the cold blank for 4 times in a primary electromagnetic induction furnace. The heating power of the 1 st time is 350KW, and the surface temperature of the blank is 800-900 ℃; the heating power of the 2 nd heating step is 500KW, and the surface temperature is 1000-1050 ℃; the heating power of the 3 rd and 4 th times is 600 KW-900 KW, the surface temperature of the blank is 1140 ℃ to 1200 ℃, and the heating is completed. Sequentially removing phosphorus by high-pressure water, uniformly coating glass powder lubricant on the inner surface and the outer surface, placing the blank into a reaming barrel, and placing lubricating glass pellets at the bell mouth of the blank. And (3) reaming by using a 2500T vertical reamer, wherein the inner diameter phi of a reaming barrel is 369mm, the reaming barrel is preheated to 100-200 ℃, the reaming speed is 150-250 mm/s, and the diameter phi of a reaming head is 102mm.
(2) And extrusion, namely heating the reamed blank twice by using a secondary electromagnetic induction furnace. The heating power of the 1 st heating step is 500KW, and the temperature of the blank is 1050-1100 ℃. The heating power of the 2 nd heating is 800KW, and the temperature of the blank is 1140-1200 ℃. And (3) performing high-pressure water descaling under the pressure of 18-23 MPa, uniformly smearing glass powder lubricant on the inner surface and the outer surface, placing a lubricating glass pad at the front end of the extrusion die, and enabling the inner cavity of the glass pad to be 20-40 mm larger than the inner cavity of the extrusion die. The barrel was extruded with a 6300T horizontal extruder to an inside diameter of phi 375mm. The extrusion barrel is preheated to 260-450 ℃, the extrusion speed is 200-350 mm/s, the diameter of the core rod phi is 91mm, the inner diameter phi 183.5mm of the extrusion die is used for extruding steel pipes with phi 180mm multiplied by 45 mm.
(3) And a cooling step of air-cooling the steel pipe after extrusion to obtain the steel pipe with finished product size.
And fifthly, annealing, heating the steel pipe to 840-870 ℃, preserving heat, cooling to below 500 ℃ in a furnace for min, and cooling to room temperature in an air way.
The double-liquid quenching treatment comprises water quenching and oil quenching, wherein the double-liquid quenching treatment comprises the following steps: (1) and (3) conveying the steel pipe into a quenching furnace, heating to 950-980 ℃, and immediately discharging after finishing heat preservation. (2) The steel pipe is quickly transferred to a rotary riding wheel in a water tank filled with circulating water, the rotating speed of the riding wheel is 30-40 rpm, the distance between each pair of towing wheels is 0.8-1.6 m, the steel pipe is driven by the towing wheels to rotate, an inner nozzle arranged at one end of the steel pipe is opened, the inner diameter of the inner nozzle is 25-50 mm smaller than that of the steel pipe, and inner water spray is axially sprayed into an inner hole of the steel pipe. (3) After the internal water spray cooling is carried out for 5-10 s, the whole rotary riding wheel device sinks, so that the diameter direction of the steel pipe is immersed below 200mm of the water surface, and the steel pipe is continuously cooled under the simultaneous actions of internal water spray and immersion. (4) When the temperature of the steel pipe is cooled to 200-400 ℃, the rotary riding wheel device is integrally lifted to enable the steel pipe to leave the water surface. (5) And rapidly transferring the water quenched steel pipe to a fixed support in a cooling oil groove, and using quenching oil as a cooling medium to reduce quenching stress and avoid cracks. (6) Cooling the steel pipe to below 80 ℃ and ending quenching.
And tempering, heating the steel pipe to 560-600 ℃, preserving heat for 200-300 min, and cooling to room temperature by water.
And straightening the finished product by adopting a pressure straightening mode.
The steel pipe is heated to 500-550 ℃, kept warm for 120-180 min, and cooled to room temperature in air, thus obtaining the 9Cr thick-wall stainless steel seamless steel pipe with 110 steel grade yield strength. The performance of the produced 9Cr thick-wall stainless steel seamless steel pipe with yield strength of 110 steel grade is tested, and the test data are shown in Table 1.2.
TABLE 1.2 Properties of a phi 180mm 45mm yield 110 grade 9Cr thick wall stainless Steel seamless Steel tube
Example 2
The production specification of the 9Cr thick-wall stainless steel seamless steel pipe with the yield strength of 110 steel grade is that the outer diameter phi 219mm is multiplied by the wall thickness of 35mm, and the chemical compositions are shown in table 2.1:
TABLE 2 chemical composition/(mass percent) of seamless steel pipe with diameter of 219mm x 35mm
Remarks: the balance of Fe and unavoidable impurities.
The production process of the 9Cr thick-wall stainless steel seamless steel pipe with the yield strength of 110 steel grade comprises the following steps:
the method comprises the steps of preparing a round continuous casting blank through an electric arc furnace, external refining, vacuum degassing and rolling. (1) The molten iron is pretreated, the temperature for heating the molten iron is more than 1250 ℃, and the component mass percent is less than or equal to 0.08 and less than or equal to 0.10. (2) The mass percentage of steel components during smelting is controlled to be more than or equal to 0.06, P is less than or equal to 0.008, and the tapping temperature is more than or equal to 1635 ℃. (3) Refining in a refining furnace, wherein the temperature is more than or equal to 1535 ℃. The method comprises the steps of (1) carrying out external refining on 250 kg/t-300 kg/furnace of lime, carrying out reinforced deoxidation and desulfurization in the earlier stage of refining according to the slag condition fine adjustment quantity, adjusting the consumption of fluorite according to the slag condition to be less than or equal to 1.5kg/t, carrying out white slag time for 20 min-60 min, feeding aluminum wires when the furnace is out, and controlling the tapping temperature to be more than or equal to 1600 ℃ according to the mass percentage of Alt components of 0.010% -0.045%. (4) Vacuum degassing, keeping the vacuum degree below 67Pa for 20-35 min, closing argon tightly in the pressure maintaining process, stirring for 1-2 min for sampling analysis after breaking, adding a calcium silicate wire, and adding Ca/Al mass ratio: and controlling the temperature of the molten steel to be between 1500 and 1570 ℃ at 0.12 and 0.25. (5) Rolling the blank, and producing a round blank with the diameter phi 430mm of 9Cr by rolling.
And (3) annealing the blank, namely heating the round blank to 820-850 ℃ in a chamber type heating furnace for annealing, preserving heat for 5-10 h, cooling to 350-500 ℃ at a speed of 20-50 ℃/h, and discharging and cooling to room temperature.
And thirdly, processing the blank, namely cutting the round blank according to the length of the finished steel pipe, and processing the blank with the outer diameter phi 415 mm/the inner diameter phi 60mm and the length 950 mm. The head is processed into a bullnose with the radius of R35mm, the internal and external circles are processed, polished and polished, the surface roughness Ra is less than or equal to 3.2 mu m, the diameter deviation is +/-1.0 mm, the length deviation is +/-10 mm, the flat end faces at two ends are 90 degrees, and the horn mouth angle of the head is 45 degrees.
And fourthly, performing extrusion forming of the steel pipe, wherein the extrusion forming comprises a reaming process, an extrusion process and a cooling process.
(1) Reaming, namely heating the cold blank in a primary electromagnetic induction furnace for 4 times; the heating power of the 1 st time is 350KW, and the surface temperature of the blank is 800-900 ℃. The heating power of the 2 nd heating step is 500KW, and the surface temperature is 1000-1050 ℃; the heating power of the 3 rd and 4 th times is 600 KW-900 KW, the surface temperature of the blank is 1140 ℃ to 1200 ℃, and the heating is completed. Sequentially removing phosphorus by high-pressure water, uniformly coating glass powder lubricant on the inner surface and the outer surface, placing the blank into a reaming barrel, and placing lubricating glass pellets at the bell mouth of the blank. And (3) reaming by using a 2500T vertical reamer, wherein the inner diameter phi 425mm of a reaming barrel is preheated to 100-200 ℃, the reaming speed is 150-250 mm/s, and the diameter phi 162mm of a reaming head.
(2) And extrusion, namely heating the reamed blank twice by using a secondary electromagnetic induction furnace. The heating power of the 1 st heating step is 500KW, and the temperature of the blank is 1050-1100 ℃. The heating power of the 2 nd heating is 800KW, and the temperature of the blank is 1140-1200 ℃. Performing high-pressure water descaling under 18-23 MPa, uniformly smearing glass powder lubricant on the inner and outer surfaces, placing a lubricating glass pad at the front end of the extrusion die, wherein the inner cavity of the glass pad is 20-40 mm larger than the inner cavity of the extrusion die; the barrel was extruded with a 6300T horizontal extruder to an inside diameter of phi 435mm. The extrusion barrel is preheated to 260-450 ℃, the extrusion speed is 200-350 mm/s, the diameter phi of the core rod is 151mm, the inner diameter phi of the extrusion die is 223mm, and the steel pipe with phi 219mm multiplied by 35mm is extruded.
(3) And a cooling step of air-cooling the extruded steel pipe to obtain a finished product of the steel pipe.
And fifthly, annealing, heating the steel pipe to 840-870 ℃, preserving heat, cooling to below 500 ℃ in a furnace for min, and cooling to room temperature in an air way.
The double-liquid quenching treatment comprises water quenching and oil quenching, wherein the double-liquid quenching treatment comprises the following steps: the process of the double-liquid quenching treatment is as follows: (1) and (3) conveying the steel pipe into a quenching furnace, heating to 950-980 ℃, and immediately discharging after finishing heat preservation. (2) The steel pipe is quickly transferred to a rotary riding wheel in a water tank filled with circulating water, the rotating speed of the riding wheel is 30-40 rpm, the distance between each pair of towing wheels is 0.8-1.6 m, the steel pipe is driven by the towing wheels to rotate, an inner nozzle arranged at one end of the steel pipe is opened, the inner diameter of the inner nozzle is 25-50 mm smaller than that of the steel pipe, and inner water spray is axially sprayed into an inner hole of the steel pipe. (3) After the internal water spray cooling is carried out for 5-10 s, the whole rotary riding wheel device sinks, so that the diameter direction of the steel pipe is immersed below 200mm of the water surface, and the steel pipe is continuously cooled under the simultaneous actions of internal water spray and immersion. (4) When the temperature of the steel pipe is cooled to 200-400 ℃, the rotary riding wheel device is integrally lifted to enable the steel pipe to leave the water surface; (5) the steel pipe after water quenching is quickly transferred to a fixed bracket in a cooling oil groove, quenching oil is used as a cooling medium, quenching stress is reduced, and cracks are avoided; (6) cooling the steel pipe to below 80 ℃ and ending quenching.
Tempering, heating the steel pipe to 560-600 deg.c, maintaining for 200-300 min, water cooling to room temperature
And straightening the finished product by adopting a pressure straightening mode.
The steel pipe is heated to 500-550 ℃, kept warm for 120-180 min, and cooled to room temperature in air, thus obtaining the 9Cr thick-wall stainless steel seamless steel pipe with 110 steel grade yield strength.
The performance of the produced 9Cr thick-wall stainless steel seamless steel pipe with yield strength of 110 steel grade was tested, and the test data are shown in Table 2.2.
TABLE 2.2 Properties of a phi 219mm 35mm yield 110 Steel grade 9Cr thick wall stainless Steel seamless Steel tube
Claims (10)
1. A production method of a 9Cr thick-wall stainless steel seamless steel pipe with 110 steel grade yield strength is characterized by comprising the following steps: the production method comprises the following steps:
smelting molten steel by an arc furnace, external refining and vacuum degassing process by taking molten iron as a raw material, producing a 9Cr initial raw material by continuous casting or rolling or die casting, and forging a round blank;
secondly, annealing the blank, namely heating the round blank to 800-860 ℃ in a chamber type heating furnace for annealing;
thirdly, processing the blank, cutting the annealed round blank, and removing the surface oxide skin and the internal center loose and crack;
extruding and forming, namely extruding the steel pipe by using a 6300T horizontal extruder unit to obtain a finished steel pipe, wherein the extruding and forming comprises a reaming process, an extruding process and a cooling process;
fifthly, annealing, heating the steel pipe to 840-870 ℃, preserving heat, cooling to below 500 ℃ in a furnace, and cooling to room temperature in an air cooling way;
performing double-liquid quenching treatment, namely heating a steel pipe to 950-980 ℃, preserving heat for 90-150 min, immersing in water for rapid cooling, rapidly transferring the steel pipe into oil when the temperature of the steel pipe reaches 200-400 ℃, cooling to below 80 ℃, and air cooling to room temperature;
tempering, namely heating the steel pipe to 560-600 ℃, preserving heat for 200-300 min, and cooling the steel pipe to room temperature by water;
straightening the finished product by adopting a pressure straightening mode;
the steel pipe is heated to 500-550 ℃, kept warm for 120-180 min, and cooled to room temperature in air, thus obtaining the 9Cr thick-wall stainless steel seamless steel pipe with 110 steel grade yield strength.
2. The method for producing a 9Cr thick-wall stainless steel seamless steel pipe of 110 steel grade yield strength according to claim 1, characterized by: the steel for the seamless steel pipe comprises the following components in percentage by mass: c:0.10 to 0.16, si:0.40 to 1.20, mn:0.40 to 0.90, P: less than or equal to 0.020, S: less than or equal to 0.006, cr:8.5 to 10.5, ni:0.20 to 0.50, mo:0.92 to 1.15, nb: 0.02-0.06, V:0.05 to 0.10, al:0.01 to 0.05, ca:0.0003 to 0.02 percent, cu: less than or equal to 0.25, N: less than or equal to 0.050, O: less than or equal to 0.0040, H: less than or equal to 0.0004, and the balance of Fe and unavoidable impurities.
3. The method for producing a 9Cr thick-wall stainless steel seamless steel pipe of 110 steel grade yield strength according to claim 1, characterized by: the blank preparation process comprises the following steps: (1) pretreating molten iron, heating the molten iron to 1250-1300 ℃, wherein P is less than or equal to 0.08 and S is less than or equal to 0.10; (2) smelting in an electric arc furnace, wherein the temperature of the electric arc furnace is 1650 ℃, the tapping temperature is more than or equal to 1635 ℃, C is more than or equal to 0.06, and P is less than or equal to 0.008 (mass percent); (3) refining in a refining furnace, wherein the quantity of lime is adjusted to be 250 kg/t-300 kg/furnace in a fine-tuning mode according to slag conditions, deoxidation and desulfurization are enhanced in the early stage of refining, the fluorite adjustment quantity is less than or equal to 1.5kg/t according to slag conditions, the slag time is 20-60 min, aluminum wires are fed when the aluminum wires are discharged, the aluminum wires are controlled according to the proportion of Alt components of 0.010-0.045% by mass, and the tapping temperature is more than or equal to 1600 ℃; (4) vacuum degassing, keeping the vacuum degree below 67Pa for 20-35 min, closing argon tightly in the pressure maintaining process, stirring for 1-2 min for sampling analysis after breaking, adding a calcium silicate wire, and adding Ca/Al mass ratio: controlling the temperature of molten steel to be between 1500 and 1570 ℃ under the control of 0.12 and 0.25; (5) preparing a round billet, and producing a 9Cr initial raw material by continuous casting or rolling or die casting, wherein the continuous casting or rolling directly produces the round billet, and the die casting raw material forges the round billet.
4. A method for producing a yield strength 110 steel grade 9Cr thick wall stainless steel seamless pipe according to claim 3, characterized by: the compression ratio of the rolled round blank is 3.0-10.0; the die casting raw materials need to be forged to produce round blanks, the initial forging temperature is not lower than 1050 ℃, the final forging temperature is not lower than 900 ℃, the finishing temperature is 800-880 ℃, the reduction of each pass is 15-80 mm, the feeding amount is 50-150 mm, and the final fire deformation amount is more than 15%.
5. The method for producing a 9Cr thick-wall stainless steel seamless steel pipe of 110 steel grade yield strength according to claim 1, characterized by: the reaming process is carried out, and the cold blank is heated for 4 times in a primary electromagnetic induction furnace; the heating power of the 1 st time is 350KW, and the surface temperature of the blank is 800-900 ℃; the heating power of the 2 nd heating step is 500KW, and the surface temperature is 1000-1050 ℃; heating power of 600 KW-900 KW for the 3 rd and 4 th times, and the surface temperature of the blank reaches 1140-1200 ℃ to finish heating; sequentially removing phosphorus by high-pressure water, uniformly coating glass powder lubricant on the inner surface and the outer surface, placing a blank into a reaming barrel, and placing lubricating glass pellets at a bell mouth of the blank; and (3) reaming by using a 2500T vertical reamer, wherein the outer diameter of the blank is 5-10 mm smaller than the inner diameter of a reaming barrel, the reaming barrel is preheated to 100-200 ℃, the reaming speed is 150-250 mm/s, and the reaming ratio is 1.01-1.36.
6. The method for producing a 9Cr thick-wall stainless steel seamless steel pipe of 110 steel grade yield strength according to claim 1, characterized by: the extrusion procedure, the blank after reaming is heated twice by a secondary electromagnetic induction furnace; the heating power of the 1 st time is 500KW, and the temperature of the blank is 1050-1100 ℃; heating power 800KW for the 2 nd time, and the temperature of the blank is 1140-1200 ℃; performing high-pressure water descaling under 18-23 MPa, uniformly smearing glass powder lubricant on the inner and outer surfaces, placing a lubricating glass pad at the front end of the extrusion die, wherein the inner cavity of the glass pad is 20-40 mm larger than the inner cavity of the extrusion die; extruding with 6300T horizontal extruder, the expanded blank has diameter smaller than the inner diameter of the extruding barrel by 4-10 mm, the extruding barrel is preheated to 260-450 deg.c and extruding speed of 200-350 mm/s and extruding ratio of 5-15.
7. The method for producing a 9Cr thick-wall stainless steel seamless steel pipe of 110 steel grade yield strength according to claim 1, characterized by: the process of the double-liquid quenching treatment is as follows: (1) the steel pipe is sent into a quenching furnace to be heated to 950 ℃ to 980 ℃, and the steel pipe is immediately discharged after finishing heat preservation; (2) rapidly transferring the steel pipe to a rotary riding wheel in a water tank filled with circulating water, wherein the rotating speed of the riding wheel is 30-40 rpm, the distance between each pair of towing wheels is 0.8-1.6 m, the steel pipe is driven by the towing wheels to rotate, an inner nozzle arranged at one end of the steel pipe is opened, the inner diameter of the inner nozzle is 25-50 mm smaller than that of the steel pipe, and inner water spray is axially sprayed into an inner hole of the steel pipe; (3) after the internal water spray cooling is carried out for 5 to 10 seconds, the whole rotary riding wheel device sinks, so that the diameter direction of the steel pipe is immersed below 200mm of the water surface, and the steel pipe is continuously cooled under the simultaneous actions of the internal water spray and the immersion; (4) when the temperature of the steel pipe is cooled to 200-400 ℃, the rotary riding wheel device is integrally lifted to enable the steel pipe to leave the water surface; (5) rapidly transferring the water quenched steel pipe to a fixed bracket in a cooling oil groove; (6) cooling the steel pipe to below 80 ℃ and ending quenching.
8. The method for producing a 9Cr thick-wall stainless steel seamless steel pipe of 110 steel grade yield strength according to claim 1, characterized by: the blank is processed, a head is processed to form a bullnose with the radius of R35mm, the internal and external circles are processed, polished and polished, the surface roughness Ra is less than or equal to 3.2 mu m, the diameter deviation is +/-1.0 mm, the length deviation is +/-10 mm, the flat end faces at two ends are 90 degrees, and the horn mouth angle of the head is 41-46 degrees.
9. The method for producing a 9Cr thick-wall stainless steel seamless steel pipe of 110 steel grade yield strength according to claim 1, characterized by: the seamless steel pipe has the following properties: the tensile strength is greater than or equal to 880MPa, the Rp0.2 yield strength is 758-950 MPa, the elongation is greater than or equal to 15%, the area shrinkage is greater than or equal to 40%, the hardness is 275-320 HBW, and the full-size impact energy of a transverse Charpy V-shaped notch at-10 ℃ is greater than or equal to 25J.
10. A yield strength 110 steel grade 9Cr thick wall stainless steel seamless steel pipe according to claim 1, characterized by: the diameter of the outer circle of the seamless steel tube is phi 120-phi 500mm; the wall thickness is 25 mm-70 mm.
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| CN118080600A (en) * | 2024-04-19 | 2024-05-28 | 邯郸新兴特种管材有限公司 | Manufacturing method of 110ksi steel grade non-magnetic seamless steel tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118080600A (en) * | 2024-04-19 | 2024-05-28 | 邯郸新兴特种管材有限公司 | Manufacturing method of 110ksi steel grade non-magnetic seamless steel tube |
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