CN106903246A - The forging technology of 2Cr11Mo1VNbN steel used for steam turbine blades forging - Google Patents
The forging technology of 2Cr11Mo1VNbN steel used for steam turbine blades forging Download PDFInfo
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- CN106903246A CN106903246A CN201710137793.5A CN201710137793A CN106903246A CN 106903246 A CN106903246 A CN 106903246A CN 201710137793 A CN201710137793 A CN 201710137793A CN 106903246 A CN106903246 A CN 106903246A
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- steam turbine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/20—Control devices specially adapted to forging presses not restricted to one of the preceding subgroups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K3/00—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like
- B21K3/04—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like blades, e.g. for turbines; Upsetting of blade roots
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The present invention relates to a kind of forging technology of 2Cr11Mo1VNbN steel used for steam turbine blades forging, the forging technology includes：Before forging during heating, control charging temperature is no more than 600 DEG C, low temperature programming rate is no more than 70 DEG C/h, simultaneously 650~750 DEG C, insulation 6~8 hours, again 1190 ± 10 DEG C are warming up to the programming rate no more than 100 DEG C/h, 1100 ± 10 DEG C are cooled to after being incubated 4~6 hours at 1190 ± 10 DEG C, forging of coming out of the stove for 2~4 hours is incubated；During forging, take the clamping jaw of A, B two laterally to draw using precise forging machine and play or push away dozen forging, after feeding, clamp ingot tail end, B chucks are pointed at rising head end.There is provided it is an object of the invention to overcome delta ferrite level in the 2Cr11Mo1VNbN steel used for steam turbine blades tissues for producing in the prior art is high, forging is easily ftractureed and has a strong impact on its obdurability shortcoming and a kind of solve the problems, such as 2Cr11Mo1VNbN steel used for steam turbine blades forging cracking, meet its obdurability requirement, reduce machining allowance and the forging technology of the 2Cr11Mo1VNbN steel used for steam turbine blades forging of improve production efficiency.
Description
Technical field
The present invention relates to ferrous materials manufacturing process control field, more particularly to a kind of 2Cr11Mo1VNbN turbine blades
With the forging technology of steel forgings.
Background technology
The production method for 2Cr11Mo1VNbN steel used for steam turbine blades routine is at present：Heated by open die forgings general
III group of steel of technical requirements is heated, using oil（Water）Press forging molding, not only forges big surplus, forging deformation amount, deformation
Speed and deformation temperature are difficult precise control, while δ-ferrite content is high in tissue, forging is easily ftractureed, and has a strong impact on it
Obdurability, production cost and percent defective are higher.
The content of the invention
It is an object of the invention to overcome the above-mentioned 2Cr11Mo1VNbN steel used for steam turbine blades groups for producing in the prior art
Knit middle δ-ferrite content it is high, forging easily ftracture and have a strong impact on the shortcoming of its obdurability and a kind of solution is provided
2Cr11Mo1VNbN steel used for steam turbine blades forging crackings problem, meet its obdurability requirement, reduce machining allowance and carry
The forging technology of the 2Cr11Mo1VNbN steel used for steam turbine blades forging of high efficiency.
To achieve these goals, the present invention is adopted the following technical scheme that：A kind of 2Cr11Mo1VNbN turbine blades
With the forging technology of steel forgings, the forging technology includes：Before forging during heating, control charging temperature is no more than 600 DEG C, and in the temperature
The lower insulation of degree 3~5 hours, low temperature programming rate is no more than 70 DEG C/h, while 650~750 DEG C, insulation 6~8 hours, then
1190 ± 10 DEG C are warming up to the programming rate no more than 100 DEG C/h, are cooled to after being incubated 4~6 hours at 1190 ± 10 DEG C
1100 ± 10 DEG C, it is incubated forging of coming out of the stove for 2~4 hours；During forging, the equipment advantage of precise forging machine is made full use of, take the clamping jaw of A, B two
Laterally draw to beat or push away and play forging, after feeding, clamp ingot tail end, B chucks are pointed at rising head end.
The first reduction in pass is controlled for 20mm, it is 2m/min to push away and beat speed, to improve forging inside plasticity.
Strict during main transformer shape forging to control draught per pass for 40mm, rapidity of blow is no more than 4m/min, it is ensured that forging
Internal fully forging is saturating and reduces the generation of stress.
Control last a time to draw and beat speed for 1.5m/min, to ensure forging surface quality.
To keep good Forging Plasticity and avoiding δ-ferritic generation, whole forging process controls the initial forging temperature to be
960~990 DEG C, final forging temperature is 850~880 DEG C.
Wherein optimal forging temperature is 860 DEG C, and when controlling last a time to forge, initial forging temperature is no more than 920 DEG C, most
The final forging temperature of a time is no more than 870 DEG C afterwards.
The good effect that technical scheme is produced is as follows：The present invention solves 2Cr11Mo1VNbN turbine blades
With δ-ferrite content in cracking, annealed structure in steel forgings forging process, the technical barrier of high, forging obdurability difference, not only makes
Product quality is guaranteed, and the machine-finish allowance of the production method is small, production efficiency is high, reduce production cost, together
When forging permeability it is good, the mechanical property of each several part is uniform and obdurability is high, extends service life, and production technology is more passed through
Ji, science.
Forging before heating when, according to the material alloys constituent content it is high, pyroconductivity is low, Forging Plasticity is poor the characteristics of, be anti-
Temperature stress and structural stress are only produced during low-temperature heat and is ftractureed, control charging temperature is no more than 600 DEG C and at such a temperature
Insulation 3~5 hours, afterwards with the programming rate no more than 70 DEG C/h be warming up to 650~750 DEG C, insulation 6~8 hours, make electricity
Slag ingot internal and external temperature is fully consistent, it is to avoid because of temperature stress cracking, then be warming up to 1190 with the programming rate no more than 100 DEG C/h
± 10 DEG C, for ensure the abundant heat penetration of ESR ingot and as far as possible δ-ferritic precipitation is reduced or avoided, 1190 ± 10 DEG C be incubated 4~
1100 ± 10 DEG C are cooled to after 6 hours, forging of coming out of the stove for 2~4 hours is incubated.
By following control deflection, it is 20mm to control first drafts to forging process, and main purpose is to improve as cast condition group
Knit, improve Forging Plasticity；Main transformer shape draught per pass is 40mm, controls to draw and beats speed for 4m/min, and it is 2m/ to push away and beat speed
Min, to ensure forging surface quality, controls last a time to draw and beats speed for 1.5m/min；Meanwhile, surveyed repeatedly in forging process
Temperature, whole forging process keeps forging temperature between 850~990 DEG C, wherein 860 DEG C is Optimal Temperature；Control simultaneously last
When a time is forged, temperature can start forging when being no more than 920 DEG C, so both can ensure that the fully forging of forging inside was saturating, again may be used
Temperature rise is avoided to cause forging inside to produce a large amount of δ-ferrites and produce stress to cause forging crack.
Brief description of the drawings
Fig. 1 is heating schedule curve map before the turbine blade steel forging of the embodiment of the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is further elaborated and explanation.
Embodiment one
The forging technology of 2Cr11Mo1VNbN steel used for steam turbine blades forging, with a diameter of φ 125mm specifications（Forging stock size is φ
140mm）2Cr11Mo1VNbN steel used for steam turbine blades forging as a example by, be analyzed.Rule are heated before the specification blade steel forging
Model such as Fig. 1, control charging temperature is no more than 600 DEG C and is incubated 3 hours at such a temperature, afterwards with the intensification no more than 70 DEG C/h
Speed be warming up to 650~750 DEG C, insulation 6 hours, then be warming up to 1190 ± 10 DEG C with the programming rate no more than 100 DEG C/h
And it is cooled to 1100 ± 10 DEG C after being incubated 4 hours, insulation is come out of the stove forging for 2 hours；Forging process control deflection, deformation velocity and
Deformation temperature, it is ensured that homogeneous deformation, it is to avoid tissue and temperature stress.
Its process route is：Electric furnace smelting+vacuum refining → electroslag remelting → precise forging machine forging molding → annealing → alignment
→ Physico-chemical tests, inspection → machine add to finished product → detection, inspection → packaging → delivery.
Material used is 2Cr11Mo1VNbN steel, and ESR ingot is my company oneself production.
Specific production procedure is：Electric furnace smelting+vacuum refining → electroslag remelting → heating → precise forging machine forging and molding → forging
After annealing → surface examination, Physico-chemical tests（Low power, nonmetal inclusion, grain size, mechanical property（One draws three punchings, duration running）、
δ-ferrite content, ultrasonic examination）, blanking → machining → Magnetic testing, dimension control → delivery.
Forging device therefor is SXP-65 type precise forging machines, the equipment advantage of SXP-65 precise forging machines is made full use of, according to forging
The forging program of technics institution, is laterally drawn to beat or push away and beats after taking the clamping jaw of A, B two to clamp, and blank is forged to the profile being pre-designed
Size.Forging is just tempered after being forged after terminating, alignment, inspection, ultrasonic examination, blanking, machining, Magnetic testing, quenched
The work such as treatment, final production goes out to meet the steel used for steam turbine blades forging of high-quality requirement, reaches every mechanical performance index
Arrive：Tensile strength Rm≥965N/mm2, yield strength Rp0.2≥690N/mm2, elongation after fracture δ5>=15%, contraction percentage of area Z >=
45%, impact absorbing energy Akv2>=11J, carries out hot test at 649 DEG C, and under the effect of 228Mpa power, rupture time is not shorter than
25 hours.
When precise forging machine is forged, each passage deformation size is controlled to be followed successively by φ 480mm- φ 460mm- φ 420mm- φ 380mm-
φ340mm-φ300mm-φ260mm-φ220mm-φ180mm-φ140mm.Drawn in forging process and beat, push away and beat alternately,
And control drawing to beat speed for 4m/min, it is 2m/min to push away and beat speed, is to ensure forging surface quality, and the last a time of control is drawn and beaten
Speed is 1.5m/min, whole forging process, keeps forging temperature between 850~990 DEG C, wherein 860 DEG C is Optimal Temperature,
When controlling last a time to forge simultaneously, temperature can start forging when being no more than 920 DEG C.
Embodiment two
The forging technology of 2Cr11Mo1VNbN steel used for steam turbine blades forging, with a diameter of φ 185mm specifications（Forging stock size is φ
200mm）2Cr11Mo1VNbN steel used for steam turbine blades forging as a example by, be analyzed.Add before controlling the specification blade steel forging
Heat is：Charging temperature is no more than 600 DEG C and is incubated 5 hours at such a temperature, afterwards with the programming rate liter no more than 70 DEG C/h
Temperature to 650~750 DEG C, insulation 8 hours, then with the programming rate no more than 100 DEG C/h be warming up to 1190 ± 10 DEG C and insulation 6
1100 ± 10 DEG C are cooled to after hour, forging of coming out of the stove for 4 hours is incubated；Forging process control deflection, deformation velocity and deformation temperature
Degree, it is ensured that homogeneous deformation, it is to avoid tissue and temperature stress.
Specific production procedure is：Electric furnace smelting+vacuum refining → electroslag remelting → heating → precise forging machine forging and molding → forging
After annealing → surface examination, Physico-chemical tests（Low power, nonmetal inclusion, grain size, mechanical property（One draws three punchings, duration running）、
δ-ferrite content, ultrasonic examination）, blanking → machining → Magnetic testing, dimension control → delivery.
Forging device therefor is SXP-65 type precise forging machines, the equipment advantage of SXP-65 precise forging machines is made full use of, according to forging
The forging program of technics institution, is laterally drawn to beat or push away and beats after taking the clamping jaw of A, B two to clamp, and blank is forged to the profile being pre-designed
Size.Forging is just tempered after being forged after terminating, alignment, inspection, ultrasonic examination, blanking, machining, Magnetic testing, quenched
The work such as treatment, final production goes out to meet the steel used for steam turbine blades forging of high-quality requirement, reaches every mechanical performance index
Arrive：Tensile strength Rm≥965N/mm2, yield strength Rp0.2≥690N/mm2, elongation after fracture δ5>=15%, contraction percentage of area Z >=
45%, impact absorbing energy Akv2>=11J, carries out hot test at 649 DEG C, and under the effect of 228Mpa power, rupture time is not shorter than
25 hours.
When precise forging machine is forged, each passage deformation size is controlled to be followed successively by φ 580mm- φ 560mm- φ 520mm- φ 480mm-
φ440mm-φ400mm-φ360mm-φ320mm-φ280mm-φ240mm-φ200mm.Drawn in forging process and beat, push away to beat and hand over
For carrying out, and control to draw and beat speed for 4m/min, it is 2m/min to push away and beat speed, is guarantee forging surface quality, controls last
Passage is drawn and beats speed for 1.5m/min, whole forging process, keeps forging temperature between 850~990 DEG C, wherein 860 DEG C are
Optimal Temperature, while when controlling last a time to forge, temperature can start forging when being no more than 920 DEG C.
Each process control, greatly reduces forging surplus more than, not only makes stock utilization and forging efficiency significantly
Improve, follow-up amount of machining is also accordingly reduced, so as to reduce the integrated cost of steel used for steam turbine blades product；Avoid simultaneously
δ-ferritic generation, makes the obdurability of material also be greatly improved.
By the strict control of above-mentioned each operation, Physico-chemical tests result such as table 1 is obtained.
The testing result of the example of table 1
Claims (6)
1. a kind of forging technology of 2Cr11Mo1VNbN steel used for steam turbine blades forging, it is characterised in that：The forging technology includes：
Before forging during heating, control charging temperature is no more than 600 DEG C, and is incubated 3~5 hours at such a temperature, and low temperature programming rate does not surpass
Cross 70 DEG C/h, at the same 650~750 DEG C, insulation 6~8 hours, then be warming up to the programming rate no more than 100 DEG C/h
1190 ± 10 DEG C, 1100 ± 10 DEG C are cooled to after being incubated 4~6 hours at 1190 ± 10 DEG C, are incubated forging of coming out of the stove for 2~4 hours；Forging
When making, the equipment advantage of precise forging machine is made full use of, take two clamping jaws laterally to draw and play or push away dozen forging.
2. the forging technology of 2Cr11Mo1VNbN steel used for steam turbine blades forging according to claim 1, it is characterised in that：
The first reduction in pass is controlled for 20mm, it is 2m/min to push away and beat speed, to improve forging inside plasticity.
3. the forging technology of 2Cr11Mo1VNbN steel used for steam turbine blades forging according to claim 1, it is characterised in that：
Strict during main transformer shape forging to control draught per pass for 40mm, rapidity of blow is no more than 4m/min, it is ensured that forging inside is fully
Forging is saturating and reduces the generation of stress.
4. the forging technology of the 2Cr11Mo1VNbN steel used for steam turbine blades forging according to claim any one of 1-3, its
It is characterised by：Control last a time to draw and beat speed for 1.5m/min, to ensure forging surface quality.
5. the forging technology of 2Cr11Mo1VNbN steel used for steam turbine blades forging according to claim 1, it is characterised in that：
To keep good Forging Plasticity and avoiding δ-ferritic generation, it is 960~990 that whole forging process control initial forging temperature
DEG C, final forging temperature is 850~880 DEG C.
6. the forging technology of 2Cr11Mo1VNbN steel used for steam turbine blades forging according to claim 5, it is characterised in that：
Optimal forging temperature is 860 DEG C, and when controlling last a time to forge, initial forging temperature is no more than 920 DEG C, the end of last a time
Forging temperature is no more than 870 DEG C.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107598067A (en) * | 2017-09-18 | 2018-01-19 | 无锡宏达重工股份有限公司 | A kind of processing technology of X12CrMoWVNbN10 stator blades ring forging |
| CN107598068A (en) * | 2017-09-29 | 2018-01-19 | 中国航发航空科技股份有限公司 | A kind of blade of aviation engine forging technology based on nickel base superalloy |
| CN107617713A (en) * | 2017-09-12 | 2018-01-23 | 中原特钢股份有限公司 | A kind of big specification crystallization roll steel forgings forging method |
| CN108160888A (en) * | 2017-12-26 | 2018-06-15 | 洛阳晟雅镁合金科技有限公司 | A kind of forging rolling technique of ZK61M magnesium alloys Round Billet |
| CN109536677A (en) * | 2018-11-28 | 2019-03-29 | 青岛毅凯重型锻造有限公司 | The production technology of steam turbine forging |
| CN118109742A (en) * | 2024-04-19 | 2024-05-31 | 上海核工程研究设计院股份有限公司 | Method for producing austenitic stainless steel and austenitic stainless steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107617713A (en) * | 2017-09-12 | 2018-01-23 | 中原特钢股份有限公司 | A kind of big specification crystallization roll steel forgings forging method |
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| CN107598067A (en) * | 2017-09-18 | 2018-01-19 | 无锡宏达重工股份有限公司 | A kind of processing technology of X12CrMoWVNbN10 stator blades ring forging |
| CN107598068A (en) * | 2017-09-29 | 2018-01-19 | 中国航发航空科技股份有限公司 | A kind of blade of aviation engine forging technology based on nickel base superalloy |
| CN107598068B (en) * | 2017-09-29 | 2019-09-20 | 中国航发航空科技股份有限公司 | A kind of blade of aviation engine forging technology based on nickel base superalloy |
| CN108160888A (en) * | 2017-12-26 | 2018-06-15 | 洛阳晟雅镁合金科技有限公司 | A kind of forging rolling technique of ZK61M magnesium alloys Round Billet |
| CN109536677A (en) * | 2018-11-28 | 2019-03-29 | 青岛毅凯重型锻造有限公司 | The production technology of steam turbine forging |
| CN118109742A (en) * | 2024-04-19 | 2024-05-31 | 上海核工程研究设计院股份有限公司 | Method for producing austenitic stainless steel and austenitic stainless steel |
| CN118109742B (en) * | 2024-04-19 | 2024-07-05 | 上海核工程研究设计院股份有限公司 | Method for producing austenitic stainless steel and austenitic stainless steel |
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