CN110714162A - Method for manufacturing high-temperature bolt for steam turbine - Google Patents
Method for manufacturing high-temperature bolt for steam turbine Download PDFInfo
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- CN110714162A CN110714162A CN201911053740.0A CN201911053740A CN110714162A CN 110714162 A CN110714162 A CN 110714162A CN 201911053740 A CN201911053740 A CN 201911053740A CN 110714162 A CN110714162 A CN 110714162A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000010791 quenching Methods 0.000 claims description 34
- 230000000171 quenching effect Effects 0.000 claims description 34
- 238000005496 tempering Methods 0.000 claims description 25
- 238000003754 machining Methods 0.000 claims description 24
- 238000003723 Smelting Methods 0.000 claims description 15
- 238000005242 forging Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 239000003921 oil Substances 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 238000005553 drilling Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 239000010955 niobium Substances 0.000 claims description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 239000010937 tungsten Substances 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 4
- 239000007769 metal material Substances 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 229910000734 martensite Inorganic materials 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000007514 turning Methods 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000000110 cooling liquid Substances 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- 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
- 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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
- C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
-
- 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
- C22C38/04—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
- C22C38/44—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
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
-
- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
Landscapes
- 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)
- General Engineering & Computer Science (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a method for manufacturing a high-temperature bolt for a steam turbine, belongs to the technical field of heat treatment processes of metal materials, and provides a method for manufacturing a high-temperature bolt for a steam turbine, which can effectively control the internal quality and the mechanical property of the bolt. The high-temperature bolt for the steam turbine produced by the method ensures the heat treatment effect of the metal material aiming at the specific material components by adopting the specific heat treatment process, so that the obtained product has good surface and internal quality, basically no defect, proper hardenability and uniform tempered martensite in microstructure, has higher yield strength, high-temperature endurance strength, toughness and oxidation and corrosion resistance, and can meet the operation requirement of the high-temperature bolt for the steam turbine.
Description
Technical Field
The invention relates to the technical field of heat treatment processes of metal materials, in particular to a manufacturing method of a high-temperature bolt for a steam turbine.
Background
The 10Cr11Co3W3NiMoVNbNB steel is a novel 9-12Cr martensite heat-resistant steel for an ultra-supercritical parameter unit, is mainly used for manufacturing high-temperature blades, bolts and other high-temperature end parts and the like, and has the upper limit of the use temperature of 630 ℃. The material has high yield strength, high-temperature endurance strength, toughness and oxidation and corrosion resistance.
The high-temperature bolts for the ultra-supercritical steam turbine unit in the thermal power plant are subjected to the combined action of high-temperature thermal stress and complex load in the operation, the failure and the fracture of a single bolt can enable the fastening force of the cylinder to be rearranged, the service life loss of other bolts around the cylinder is accelerated, and the leakage of high-temperature and high-pressure steam is caused. Therefore, the safety of the bolt connection of the cylinder of the turbine of the ultra-supercritical unit is an important component for ensuring the safe operation of the unit.
In the production and manufacturing process of the steam turbine fastener: in the processes of electric furnace smelting, electroslag remelting, forging, quenching and tempering heat treatment, machining and the like, if technological parameters are not controlled well, quality defects or improper high-temperature performance are caused, so that accidents such as failure of a stud of a fastener occur, and the safe operation of a generator set is seriously influenced. Therefore, the quenching and tempering heat treatment process of the high-temperature bolt is reasonably designed, the matrix structure and the precipitated phase of the material are regulated and controlled, the service performance of the bolt at high temperature is improved, and the safety and the reliability of the fastener bolt are ensured.
Disclosure of Invention
The invention aims to provide a method for manufacturing a high-temperature bolt for a steam turbine, which can effectively control the internal quality and the mechanical property of the bolt.
The technical scheme adopted by the invention for solving the technical problems is as follows: the manufacturing method of the high-temperature bolt for the steam turbine is applied to a fastener stud with the bolt specification of M36 multiplied by 3 mm-M160 multiplied by 4mm and the length of 430-520 mm, and the fastener stud comprises the following components in percentage by weight: 0.08 to 0.12 percent of carbon, less than or equal to 0.10 percent of silicon, 0.35 to 0.55 percent of manganese, 10.00 to 12.00 percent of chromium, 0.10 to 0.40 percent of molybdenum, 0.15 to 0.25 percent of vanadium, 0.40 to 0.70 percent of nickel, 2.7 to 3.2 percent of cobalt, 2.50 to 3.0 percent of tungsten, less than or equal to 0.04 percent of titanium, less than or equal to 0.01 percent of aluminum, 0.05 to 0.12 percent of niobium, 0.010 to 0.025 percent of nitrogen, 0.010 to 0.025 percent of boron, less than or equal to 0.015 percent of phosphorus, less than or equal to 0.010 percent of sulfur, and the balance of iron;
the manufacturing method comprises smelting, forging, quenching and tempering heat treatment and machining treatment in sequence;
the quenching and tempering heat treatment is a treatment process for performing the following steps on the round-rod-shaped fastener blank after smelting and forging:
A. quenching: the quenching temperature is 1085-1115 ℃, the quenching time is 60-120 min, and the oil cooling is carried out;
B. tempering: quenching at the temperature of not less than 700 ℃ for 45-75 min, and air cooling;
after quenching and tempering heat treatment, the mechanical property of the fastener blank is required to meet the following index requirements:
① tensile strength Rm (MPa) 900-1030;
② yield strength Rp0.02 is more than or equal to 690 MPa;
③ elongation A (%) > 15;
④ the section audience rating Z (%) is more than or equal to 45;
⑤ impact energy KV2(J) is more than or equal to 11;
⑥ hardness HB 290-330;
⑦ 660 deg.CStrength for a long time: stress (N/mm)2)245, the breaking time (h) is more than or equal to 100.
Further, the method comprises the following steps: according to different specifications of bolts, the setting of the quenching temperature and time parameters and the tempering temperature and time parameters in the quenching and tempering heat treatment process respectively correspond to the following table:
| bolt specification (mm) | Quenching temperature (. degree. C.) | Quenching time (min) | Tempering temperature (. degree.C.) | Tempering time (min) |
| ≤M52 | 1090 | 60 | 700 | 45 |
| M56～M100 | 1100 | 90 | 710 | 60 |
| ≥M110 | 1110 | 120 | 720 | 75 |
。
Further, the method comprises the following steps: an electric furnace smelting and slag remelting process is adopted in the smelting process, and chemical components are controlled in the smelting process to meet the requirements on the components of the fastener stud.
Further, the method comprises the following steps: the minimum forging ratio during forging was 5: 1.
Further, the method comprises the following steps: in the machining process, checking of fastener blank, drilling through holes, machining of an outer circle and cleaning of burrs are performed.
The invention has the beneficial effects that: the high-temperature bolt for the steam turbine produced by the method ensures the heat treatment effect of the metal material aiming at the specific material components by improving the heat treatment process, so that the obtained product has good surface and internal quality, basically no defect, proper hardenability and uniform tempered martensite in microstructure, thereby having higher yield strength, high-temperature endurance strength, toughness and oxidation and corrosion resistance, and being capable of meeting the operation requirements of the high-temperature bolt for the steam turbine.
Detailed Description
According to the manufacturing method of the high-temperature bolt for the steam turbine, the processes of smelting, forging, machining and the like can be processed by adopting the existing process technology; the invention aims at the process improvement of the quenching and tempering heat treatment process so as to improve the product quality through the heat treatment process.
Example 1
Quenching a forged phi 44mm round bar by an electric furnace electroslag remelting smelting process at 1090 ℃ for 60min, carrying out oil quenching, tempering at 700 ℃, preserving heat for 45min, and cooling to room temperature; the mechanical property of the quenched and tempered product meets the requirement after quenching and tempering.
When the inner hole of the stud is machined, the rotating speed of a main shaft is set to 40 revolutions per minute and the feeding amount is 0.08 mm per revolution when the inner hole is drilled, and high-pressure cooling liquid of 11.0bar is started to punch the cuttings out of the hole. Machining an M42 multiplied by 3mm double-end cylindrical thread, reserving a machining allowance of 2.5mm on the radius, performing finish turning, reserving a machining allowance of a 1.8mm turning thread, and during the thread machining, adopting a hard alloy thread forming cutter-a thread 4-tooth chaser, performing feed twice, wherein the feed amount is 1.0mm and 0.8mm respectively, the turning speed is 100M/min, and the feed amount is 3 mm/r.
When the high-temperature fastener stud of the steam turbine with the specification is processed, each stud needs to consume about 8 working hours, and the qualification rate is 99.5%.
Example 2
Quenching a forged phi 80mm round bar by an electric furnace and electroslag remelting smelting process at 1100 ℃, preserving heat for 90min, performing oil quenching, tempering at 710 ℃, preserving heat for 60min, and cooling to room temperature; the mechanical property of the quenched and tempered product meets the requirement after quenching and tempering.
When the stud inner hole is machined, the rotating speed of a main shaft is set to 35 revolutions per minute when the inner hole is drilled, the feeding amount is 0.075 mm per revolution, high-pressure cooling liquid with high pressure of 10.5bar is started, and chips are punched out of the hole. The machining method comprises the steps of machining an M76 multiplied by 4mm double-end cylindrical thread, reserving a machining allowance of 2.8mm on the radius, performing finish turning machining, reserving a machining allowance of 2.0mm turning threads, and during machining of the threads, adopting a hard alloy thread forming cutter-a thread 4-tooth chaser, feeding twice, wherein the feed amount is 1.2mm and 0.8mm respectively, the turning speed is 90M/min, and the feed amount is 3 mm/r.
When the high-temperature fastener stud of the steam turbine with the specification is processed, each stud needs to consume about 10 working hours, and the qualification rate is 99.5%.
Example 3
Quenching a forged phi 170mm round bar by an electric furnace electroslag remelting smelting process at 1110 ℃ for 120min, carrying out oil quenching, tempering at 720 ℃, carrying out heat preservation for 75min, and cooling to room temperature; the mechanical property of the quenched and tempered product meets the requirement after quenching and tempering.
When the inner hole of the stud is machined, the rotating speed of a main shaft is set to 30 revolutions per minute and the feeding amount is 0.095 mm per revolution when the inner hole is drilled, and 8.5bar high-pressure cooling liquid is started to punch the cuttings out of the hole. The machining method comprises the steps of machining an M160 multiplied by 4mm double-end cylindrical thread, reserving a machining allowance of 4.8mm on the radius, performing finish turning machining, reserving a machining allowance of a 2.4mm turning thread, and during machining of the thread, adopting a hard alloy thread forming cutter-a thread 3-tooth chaser, performing feed for three times, wherein the feed amount is respectively 1.1mm, 0.9mm and 0.4mm, the turning speed is 80M/min, and the feed amount is 4 mm/r.
When the steam turbine fastener stud with the specification is processed, each piece needs about 16 working hours, and the qualification rate is 98%.
Claims (5)
1. The manufacturing method of the high-temperature bolt for the steam turbine is characterized by comprising the following steps: the bolt is applied to a fastener stud with the bolt specification of M36 multiplied by 3 mm-M160 multiplied by 4mm and the length of 430-520 mm, and the fastener stud comprises the following components in percentage by weight: 0.08 to 0.12 percent of carbon, less than or equal to 0.10 percent of silicon, 0.35 to 0.55 percent of manganese, 10.00 to 12.00 percent of chromium, 0.10 to 0.40 percent of molybdenum, 0.15 to 0.25 percent of vanadium, 0.40 to 0.70 percent of nickel, 2.7 to 3.2 percent of cobalt, 2.50 to 3.0 percent of tungsten, less than or equal to 0.04 percent of titanium, less than or equal to 0.01 percent of aluminum, 0.05 to 0.12 percent of niobium, 0.010 to 0.025 percent of nitrogen, 0.010 to 0.025 percent of boron, less than or equal to 0.015 percent of phosphorus, less than or equal to 0.010 percent of sulfur, and the balance of iron;
the manufacturing method comprises smelting, forging, quenching and tempering heat treatment and machining treatment in sequence;
the quenching and tempering heat treatment is a treatment process for performing the following steps on the round-rod-shaped fastener blank after smelting and forging:
A. quenching: the quenching temperature is 1085-1115 ℃, the quenching time is 60-120 min, and the oil cooling is carried out;
B. tempering: quenching at the temperature of not less than 700 ℃ for 45-75 min, and air cooling;
after quenching and tempering heat treatment, the mechanical property of the fastener blank is required to meet the following index requirements:
① tensile strength Rm (MPa) 900-1030;
② yield strength Rp0.02 is more than or equal to 690 MPa;
③ elongation A (%) > 15;
④ the section audience rating Z (%) is more than or equal to 45;
⑤ impact energy KV2(J) is more than or equal to 11;
⑥ hardness HB 290-330;
⑦ 660 ℃ permanent strength stress (N/mm)2)245, the breaking time (h) is more than or equal to 100.
2. A method for manufacturing a high-temperature bolt for a steam turbine according to claim 1, wherein: according to different specifications of bolts, the setting of the quenching temperature and time parameters and the tempering temperature and time parameters in the quenching and tempering heat treatment process respectively correspond to the following table:
。
3. A method for manufacturing a high-temperature bolt for a steam turbine according to claim 1, wherein: an electric furnace smelting and slag remelting process is adopted in the smelting process, and chemical components are controlled in the smelting process to meet the requirements on the components of the fastener stud.
4. A method for manufacturing a high-temperature bolt for a steam turbine according to claim 1, wherein: the minimum forging ratio during forging was 5: 1.
5. A method of manufacturing a high-temperature bolt for a steam turbine according to any one of claims 1 to 4, wherein: in the machining process, checking of fastener blank, drilling through holes, machining of an outer circle and cleaning of burrs are performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911053740.0A CN110714162A (en) | 2019-10-31 | 2019-10-31 | Method for manufacturing high-temperature bolt for steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911053740.0A CN110714162A (en) | 2019-10-31 | 2019-10-31 | Method for manufacturing high-temperature bolt for steam turbine |
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|---|---|
| CN110714162A true CN110714162A (en) | 2020-01-21 |
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| CN201911053740.0A Pending CN110714162A (en) | 2019-10-31 | 2019-10-31 | Method for manufacturing high-temperature bolt for steam turbine |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004100027A (en) * | 2002-09-12 | 2004-04-02 | Nippon Steel Corp | Steel for liquid-phase diffusion bonding having excellent resistance to low-temperature transformation crack |
| CN101525727A (en) * | 2009-04-22 | 2009-09-09 | 四川江油六合汽轮机材料有限公司 | Heat-resisting steel material used as vane or bolt of ultra-supercritical steam turbine and preparation method thereof |
| CN103602919A (en) * | 2010-12-28 | 2014-02-26 | 株式会社东芝 | Forging heat resistant steel, manufacturing method thereof, forged parts and manufacturing method thereof |
-
2019
- 2019-10-31 CN CN201911053740.0A patent/CN110714162A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004100027A (en) * | 2002-09-12 | 2004-04-02 | Nippon Steel Corp | Steel for liquid-phase diffusion bonding having excellent resistance to low-temperature transformation crack |
| CN101525727A (en) * | 2009-04-22 | 2009-09-09 | 四川江油六合汽轮机材料有限公司 | Heat-resisting steel material used as vane or bolt of ultra-supercritical steam turbine and preparation method thereof |
| CN103602919A (en) * | 2010-12-28 | 2014-02-26 | 株式会社东芝 | Forging heat resistant steel, manufacturing method thereof, forged parts and manufacturing method thereof |
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