CN104907470B - 13Cr9Mo2Co1NiVNbNB steel forged piece manufacturing method - Google Patents

13Cr9Mo2Co1NiVNbNB steel forged piece manufacturing method Download PDF

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CN104907470B
CN104907470B CN201510207046.5A CN201510207046A CN104907470B CN 104907470 B CN104907470 B CN 104907470B CN 201510207046 A CN201510207046 A CN 201510207046A CN 104907470 B CN104907470 B CN 104907470B
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forging
steel
hours
heat treatment
incubated
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CN201510207046.5A
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CN104907470A (en
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董士良
王强
吴铁明
戴月良
曾海明
蔡娟
朱广忠
孙文彬
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上海宏钢电站设备铸锻有限公司
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Abstract

The invention discloses a 13Cr9Mo2Co1NiVNbNB steel forged piece manufacturing method. The method comprises the steps of examination of the raw material steel ingots, heating of the steel ingots, cogging and blanking of the steel ingots, forging, heat treatment after forging, examination and identification of the size of a forged piece, primary rough machining and examination and identification, primary ultrasonic flaw detection, positive temper heat treatment, mechanical property heat treatment, secondary rough machining and examination and identification, secondary ultrasonic flaw detection, sample cutting, mechanical property testing and metallographic structure examination, and product examination. According to the method for manufacturing ultra-supercritical turboset parts, such as valve discs, valve seats and valve rods by means of 13Cr9Mo2Co1NiVNbNB steel through forging, machining technology is reasonable, the qualified rate of forged pieces is high, and waste caused in the prior art is avoided. The method provides the basic technology for designing and manufacturing ultra-supercritical turbosets in China and generates quite remarkable economic benefits.

Description

The manufacture method of 13Cr9Mo2Co1NiVNbNB steel forgings
Technical field
The present invention relates to Forging Technology technical field, specifically, be a kind of novel ferritic stainless steel (13Cr9Mo2Co1NiVNbNB) manufacture method of forging.
Background technology
CO2The environmental problem that discharge causes is paid close attention to by the whole world day by day, and it is current for using and developing supercritical technology Various countries reduce important, an effective measure of CO2 discharge.Improving vapor (steam) temperature can make the efficiency of steam turbine be had Effect promotes, and reduces coal consumption and CO2 discharge.Europe and Japan have developed 620~630 in succession for employing and development supercritical technology DEG C ultra supercritical heat-resisting steel material.China is the most also designing, is manufacturing the supercritical turbine that reheat steam temperature is 620 DEG C Group.This respect, higher steam parameter proposes more stringent requirement to power station steel, only obtains that to have enough creeps strong The suitable material of degree, such as 13Cr9Mo2Co1NiVNbNB ferritic stainless steel, just can complete setting of supercritical turbine group Meter and manufacture, it is achieved efficiency increases.
13Cr9Mo2Co1NiVNbNB steel belongs to boracic nitrogenous steel, its be resistant to 620 DEG C of high temperature, long time creep strength, have good Good antioxygenic property and processing performance, can be used for the production of the important spare part of million grade supercritical turbine groups and answer With.But, the steel grades of 13Cr9Mo2Co1NiVNbNB steel is complicated, alloying element is numerous, it is big to smelt difficulty, and this material The crackle tendency of material is big, and solderability is poor, is difficult to grasp by its method manufacturing forging.
13Cr9Mo2Co1NiVNbNB steel are not had before China, same to its manufacturing process such as forging and heat treatment It is to be scarcely acquainted with.And manufacturing process conventional before using carries out production to 13Cr9Mo2Co1NiVNbNB steel and adds Work, causes forging grain size thick, does not simply fail to guarantee quality within forging, the uniformity of forging tissue, and cannot Meet parts reply to run and the room temperature power of needs in the adverse circumstances such as high temperature, oxidation, high load capacity, alternate stress for a long time Learn the properties requirements such as performance, metallographic structure, elevated temperature tensile, persistency.Manufacturing with 13Cr9Mo2Co1NiVNbNB steel Supercritical turbine group parts, during valve disc, valve seat, valve rod, cause the most meaningless waste.
Summary of the invention
It is an object of the invention to overcome above-mentioned weak point, it is provided that the system of a kind of 13Cr9Mo2Co1NiVNbNB steel forgings Make method, can make to utilize 13Cr9Mo2Co1NiVNbNB steel to manufacture supercritical turbine group parts, such as valve by the method Dish, valve seat, valve rod are smoothly completed: 13Cr9Mo2Co1NiVNbNB steel ingot is through abundant forging deformation, heat treatment after forging and property Energy heat treatment, is allowed to forging and disclosure satisfy that the requirements of supercritical turbine group parts technical specification, and processing technique Rationally, forging qualification rate is high, it is to avoid waste meaningless before.
For achieving the above object, this invention takes techniques below scheme.
The manufacture method of a kind of 13Cr9Mo2Co1NiVNbNB steel forgings, it is characterised in that comprise the steps of
(1) raw material steel ingot inspection
The 13Cr9Mo2Co1NiVNbNB steel ingot used is carried out the inspection of raw and process materials;
(2) Heating Steel Ingots
Heating 13Cr9Mo2Co1NiVNbNB steel ingot, its process step is:
Steel ingot is placed in≤heating furnace of 600 DEG C in be incubated, temperature retention time is no less than 2 hours;
Heating with the speed of≤50 ± 10 DEG C/h, make steel ingot be heated to 900 ± 20 DEG C slowly, heat time heating time is many In 6 hours;
Heating with the speed of≤70 ± 10 DEG C/h, make steel ingot be heated to 1160 ± 20 DEG C slowly, heat time heating time is not Less than 3.8 hours;
Being incubated after steel ingot reaches 1160 ± 20 DEG C, temperature retention time is no less than 3.5 hours;
13Cr9Mo2Co1NiVNbNB steel ingot is made to reach required initial forging temperature by heat treated;
(3) cogging of steel ingot and blanking
1. 13Cr9Mo2Co1NiVNbNB Heating Steel Ingots is carried out upsetting pull deformation to austenite structure state;
2. the method using die heat to cut carries out blanking by the regulation of Forging Technology to steel ingot;
(4) forging
Initial forging temperature is 1160 DEG C, and final forging temperature is 850 DEG C;Each heat time heating time >=1 hour;
Forging stock is carried out 2~3 upsetting pulls, make forging ratio reach needed for technique >=3.5;
End two fire time forging, uses end two fire that forging stock is carried out sub-material, the deformation to each cross section reserved >=30% Measure to ensure the deflection in each cross section of last fire time;
Last fire time forging, controls forging stock temperature at 1180 DEG C and ensures heat penetration;
(5) heat treatment after forging
Forging stock is carried out heat treatment of annealing, the steps include:
1. by forging hot charging stove to 650 DEG C ± 10 DEG C, temperature retention time 3~5 hours;
2. programming rate does not limits, and is warming up to 860 DEG C ± 10 DEG C, after soaking, is incubated 3~4 hours;
3. open fire door air cooling to 300 DEG C ± 10 DEG C, be incubated 5~8 hours;
4. programming rate does not limits, and is warming up to 650 DEG C ± 10 DEG C, is incubated 50 hours;
When being 5. cooled to 400 DEG C with the speed stove of≤50 DEG C/h, then it is cooled to≤200 DEG C with the speed stove of≤20 DEG C/h Time, air cooling is to room temperature afterwards;
(6) forging's block dimension inspection and mark
Specify, by Forging Technology, each shelves size examined the forged pieces and forging is identified;
(7) roughing and inspection and mark
By a roughing process stipulation, forging is carried out turnery processing, check each shelves size and identify;
(8) ultrasonic examination for the first time (UT)
Forging after roughing is carried out ultrasonic examination, and the rule of EN10308-3 credit rating 3 are pressed in ultrasonic examination Determine to carry out;
(9) positive tempering heat treatment
Forging after roughing is carried out positive tempering heat treatment, the steps include:
1., after forging is heated to 1000 DEG C ± 20 DEG C, it is incubated >=6 hours;
2. by forging air cooling to room temperature;
3. forging is reheated to 700 DEG C ± 20 DEG C again, is incubated 8 hours;
The most then forging stove is cooled to room temperature;
Can obtain being narrower than the crystal grain of more than 6 grades by positive tempering heat treatment;
(10) mechanical property heat treatment
Align the forging after tempering heat treatment and carry out mechanical property heat treatment, the steps include:
1. quench, forging is heated to 1100 DEG C ± 20 DEG C, be incubated 4 hours;
The most then forging oil is cooled to < 80 DEG C;
The most once it is tempered, forging is heated to 570 DEG C ± 20 DEG C, be incubated 4 hours;
The most then by forging air cooling to room temperature;
5. double tempering, is heated to 700 DEG C ± 20 DEG C by forging, is incubated 4 hours;
The most then by forging air cooling to room temperature;
(11) secondary roughing and inspection and mark
By secondary roughing process stipulation, forging is carried out turnery processing, check each shelves size and identify;
(12) ultrasonic examination for the second time (UT)
Forging after secondary roughing is carried out ultrasonic examination, and the rule of EN10308-3 credit rating 3 are pressed in ultrasonic examination Determine to carry out;
(13) sample is extracted
Mechanical property sample is extracted by secondary roughing process stipulation;
(14) Mechanics Performance Testing and metallographic structure inspection
Ambient temperature mechanical properties is tested: extracts sample by the requirement of roughing figure in appointed part and carries out mechanical property survey Examination, test includes: yield strength, tensile strength, elongation percentage, shrinkage factor, proper shellfish (v-notch) ballistic work, hardness etc.;
Mechanical behavior under high temperature is tested: test high-temperature instantaneous mechanical property and creep rupture strength;
Metallographic structure checks: check field trash and grain size;
(15) examination and test of products is payed into the treasury
After the assay was approved, product has i.e. been accused and has payed into the treasury.
Further, the manufacture method forging valve disc of the present invention, during step (4) is forged, the bar portion of valve disc are used Should use pulling operation, the head of valve disc should use loose tool to carry out gathering stock.
Further, use the manufacture method forging valve seat of the present invention, during step (4) is forged, saddle should be used Reaming operation, cross section each to valve seat forging stock carries out sufficient forging deformation, until by the forging of valve seat forging stock to the forging's block dimension set.
The good effect of the manufacture method of 13Cr9Mo2Co1NiVNbNB steel forgings of the present invention is:
(1) provide utilize 13Cr9Mo2Co1NiVNbNB steel manufacture supercritical turbine group parts, as valve disc, Valve seat, the forging method of valve rod, and processing technique is reasonable, forging qualification rate is high, it is to avoid waste meaningless before.
(2) designing for China, manufacture supercritical turbine group and done the deposit of basic technology, its economic benefit is the brightest Aobvious.
(3) production and the application, beneficially China CO of China's supercritical turbine group are conducive to2Reduction of discharging.
(4) be conducive to Chinese Enterprise to enter international market, improve the Chinese products competitiveness in international market.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of the manufacture method of 13Cr9Mo2Co1NiVNbNB steel forgings of the present invention.
Fig. 2 is the technological specification figure of step (2) Heating Steel Ingots.
Fig. 3 is the artwork of the positive tempering heat treatment of step (9).
Fig. 4 is step (10) mechanical property process of thermal treatment figure.
Fig. 5 is the structural representation of step (4) valve disc forging.
Detailed description of the invention
The specific embodiment party of the manufacture method of 13Cr9Mo2Co1NiVNbNB steel forgings of the present invention is given below in conjunction with accompanying drawing Formula, it should be noted that the enforcement of the present invention is not limited to following embodiment.
Embodiment 1
The manufacture method of a kind of 13Cr9Mo2Co1NiVNbNB steel forgings, comprises the steps of (seeing Fig. 1):
(1) raw material steel ingot inspection
The 13Cr9Mo2Co1NiVNbNB steel ingot used is carried out the inspection of raw and process materials, including to the reinspection of chemical composition and steel The inspection of ingot surface.
(2) Heating Steel Ingots (seeing Fig. 2)
Heating 13Cr9Mo2Co1NiVNbNB steel ingot, its process step is:
Steel ingot is placed in≤heating furnace of 600 DEG C in be incubated, temperature retention time is no less than 2 hours.
Heating with the speed of≤50 ± 10 DEG C/h, make steel ingot be heated to 900 ± 20 DEG C slowly, heat time heating time is many In 6 hours.
Heating with the speed of≤70 ± 10 DEG C/h, make steel ingot be heated to 1160 ± 20 DEG C slowly, heat time heating time is not Less than 3.8 hours.
Being incubated after steel ingot reaches 1160 ± 20 DEG C, temperature retention time is no less than 3.5 hours.
Being processed by " Heating Steel Ingots " makes 13Cr9Mo2Co1NiVNbNB steel ingot reach required initial forging temperature.
(3) cogging of steel ingot and blanking
1. 13Cr9Mo2Co1NiVNbNB Heating Steel Ingots is carried out upsetting pull deformation to austenite structure state.
2. the method using die heat to cut carries out blanking by the regulation of Forging Technology to steel ingot.
(4) forging
Initial forging temperature is 1160 DEG C, and final forging temperature is 850 DEG C;Each heat time heating time >=1 hour.
Forging stock is carried out 2~3 upsetting pulls, make forging ratio reach needed for technique >=3.5.
End two fire time forging, uses end two fire that forging stock is carried out sub-material, the deflection to each cross section reserved >=30% To ensure the deflection in each cross section of last fire time.
Last fire time forging, controls forging stock temperature at 1180 DEG C, can properly increase 20 DEG C and ensure heat penetration.
If forging valve disc, the bar portion of valve disc should use pulling operation, and the head of valve disc should use loose tool to carry out local upsetting Slightly (see Fig. 5).
If forging valve seat, should use saddle forging operation, cross section each to valve seat forging stock carries out sufficient forging deformation, directly To the forging's block dimension by valve seat forging stock forging to setting.
(5) heat treatment after forging
Forging stock is carried out heat treatment of annealing, the steps include:
1. by forging hot charging stove to 650 DEG C ± 10 DEG C, temperature retention time 3~5 hours.
2. programming rate does not limits, and is warming up to 860 DEG C ± 10 DEG C, after soaking, is incubated 3~4 hours.
3. open fire door air cooling to 300 DEG C ± 10 DEG C, be incubated 5~8 hours.
4. programming rate does not limits, and is warming up to 650 DEG C ± 10 DEG C, is incubated 50 hours.
When being 5. cooled to 400 DEG C with the speed stove of≤50 DEG C/h, then it is cooled to≤200 DEG C with the speed stove of≤20 DEG C/h Time, air cooling is to room temperature afterwards.
(6) forging's block dimension inspection and mark
Specify, by Forging Technology, each shelves size examined the forged pieces and forging is identified.
(7) roughing and inspection and mark
By a roughing process stipulation, forging is carried out turnery processing, check each shelves size and identify.
(8) ultrasonic examination for the first time (UT)
Forging after roughing is carried out ultrasonic examination, and the rule of EN10308-3 credit rating 3 are pressed in ultrasonic examination Determine to carry out.
(9) positive tempering heat treatment
Forging after roughing is carried out positive tempering heat treatment, the steps include:
1., after forging is heated to 1000 DEG C ± 20 DEG C, it is incubated >=6 hours.
2. by forging air cooling to room temperature.
3. forging is reheated to 700 DEG C ± 20 DEG C again, is incubated 8 hours.
The most then forging stove is cooled to room temperature, and (" stove is cold " is meant that: after forging insulation terminates, closes fire door, cuts off Heat-treatment furnace power supply, forging is cooled to room temperature in heat treatment burner hearth together along with furnace temperature) (seeing Fig. 3).
Can obtain being narrower than the crystal grain of more than 6 grades by the positive tempering heat treatment of step (9).
(10) mechanical property heat treatment (seeing Fig. 4)
Align the forging after tempering heat treatment and carry out mechanical property heat treatment, the steps include:
1. quench, forging is heated to 1100 DEG C ± 20 DEG C, be incubated 4 hours.
The most then forging oil is cooled to < 80 DEG C.
The most once it is tempered, forging is heated to 570 DEG C ± 20 DEG C, be incubated 4 hours.
The most then by forging air cooling to room temperature.
5. double tempering, is heated to 700 DEG C ± 20 DEG C by forging, is incubated 4 hours.
The most then by forging air cooling to room temperature.
(11) secondary roughing and inspection and mark
By secondary roughing process stipulation, forging is carried out turnery processing, check each shelves size and identify.
(12) ultrasonic examination for the second time (UT)
Forging after secondary roughing is carried out ultrasonic examination, and the rule of EN10308-3 credit rating 3 are pressed in ultrasonic examination Determine to carry out.
(13) sample is extracted
Mechanical property sample is extracted by secondary roughing process stipulation.
(14) Mechanics Performance Testing and metallographic structure inspection
Ambient temperature mechanical properties is tested: extracts sample by the requirement of roughing figure in appointed part and carries out mechanical property survey Examination, test includes: yield strength, tensile strength, elongation percentage, shrinkage factor, proper shellfish (v-notch) ballistic work, hardness.Concrete power Learn performance test value and be shown in Table 1.
Table 1. Mechanics Performance Testing value
,
Note: * is the meansigma methods of 3 impact specimens, it is allowed to one of them sample ballistic work is less than setting, but is not lower than 17J。
Mechanical behavior under high temperature is tested: test high-temperature instantaneous mechanical property and creep rupture strength.Concrete mechanical property Test value is shown in Table 2 and table 3.
Table 2. high-temperature instantaneous Mechanics Performance Testing value
Table 3. creep rupture strength test value
Metallographic structure checks: check field trash and grain size
The mean grain size of forging should not be coarser than 3.0 grades, is less than 2 grades with the deviation of mean grain size.
Forging A, B, C, D, DS five type field trash be all not to be exceeded 2.5 grades.
(15) examination and test of products is payed into the treasury
After the assay was approved, product has i.e. been accused and has payed into the treasury.
Know in an embodiment of the present invention:
(1) Forging Technology and Technology for Heating Processing are very big to the performance impact of 13Cr9Mo2Co1NiVNbNB steel, due to The resistance of deformation of 13Cr9Mo2Co1NiVNbNB steel is big, needs many fire during forging, and the too high meeting of forging temperature causes grain coarsening.
(2), in forging process, the heating-up temperature of forging blank, temperature retention time and deformation rate are to be related to the weight of forging quality Want factor.
(3) the positive tempering heat treatment in forging process can obtain ferrite and adds the uniform formation of carbide, can make grain size Further refinement, can ensure that subsequently mechanical property heat treatment austenitizing time carbide can fully dissolve.
Test to the 13Cr9Mo2Co1NiVNbNB steel forgings of embodiment 1 processing:
By SQB44.35-2014 technical standard, use the method for testing of embodiment 1 step (14) that embodiment 1 is processed 13Cr9Mo2Co1NiVNbNB steel valve seat and valve disc forging are tested.
Test result is as follows:
The 13Cr9Mo2Co1NiVNbNB steel valve seat of table 4. embodiment 1 processing and the mechanical property of valve disc forging
The 13Cr9Mo2Co1NiVNbNB steel valve seat of table 5. embodiment 1 processing and the high-temperature instantaneous mechanical property of valve disc forging
The 13Cr9Mo2Co1NiVNbNB steel valve seat of table 6. embodiment 1 processing and the creep rupture strength of valve disc forging
The 13Cr9Mo2Co1NiVNbNB steel valve seat of table 7. embodiment 1 processing and the field trash of valve disc forging and grain size etc. Level
The foregoing is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For Yuan, on the premise of without departing from manufacture method of the present invention, it is also possible to make some improvements and modifications, these improvements and modifications Also protection scope of the present invention should be considered as.

Claims (3)

1. the manufacture method of a 13Cr9Mo2Co1NiVNbNB steel forgings, it is characterised in that comprise the steps of
(1) raw material steel ingot inspection
The 13Cr9Mo2Co1NiVNbNB steel ingot used is carried out the inspection of raw and process materials;
(2) Heating Steel Ingots
Heating 13Cr9Mo2Co1NiVNbNB steel ingot, its process step is:
Steel ingot is placed in≤heating furnace of 600 DEG C in be incubated, temperature retention time is no less than 2 hours;
Heating with the speed of≤50 ± 10 DEG C/h, make steel ingot be heated to 900 ± 20 DEG C slowly, heat time heating time is little no less than 6 Time;
Heating with the speed of≤70 ± 10 DEG C/h, make steel ingot be heated to 1160 ± 20 DEG C slowly, heat time heating time is no less than 3.8 hour;
Being incubated after steel ingot reaches 1160 ± 20 DEG C, temperature retention time is no less than 3.5 hours;
13Cr9Mo2Co1NiVNbNB steel ingot is made to reach required initial forging temperature by heat treated;
(3) cogging of steel ingot and blanking
1. 13Cr9Mo2Co1NiVNbNB Heating Steel Ingots is carried out upsetting pull deformation to austenite structure state;
2. the method using die heat to cut carries out blanking by the regulation of Forging Technology to steel ingot;
(4) forging
Initial forging temperature is 1160 DEG C, and final forging temperature is 850 DEG C;Each heat time heating time >=1 hour;
Forging stock is carried out 2~3 upsetting pulls, make forging ratio reach needed for technique >=3.5;
End two fire time forging, uses end two fire time forging stock to be carried out sub-material, to the deflection in each cross section reserved >=30% to protect The deflection in each cross section of the last fire time of card;
Last fire time forging, controls forging stock temperature at 1180 DEG C and ensures heat penetration,
(5) heat treatment after forging
The forging of step (4) forging gained is carried out heat treatment of annealing, the steps include:
1. by forging hot charging stove to 650 DEG C ± 10 DEG C, temperature retention time 3~5 hours;
2. programming rate does not limits, and is warming up to 860 DEG C ± 10 DEG C, after soaking, is incubated 3~4 hours;
3. open fire door air cooling to 300 DEG C ± 10 DEG C, be incubated 5~8 hours;
4. programming rate does not limits, and is warming up to 650 DEG C ± 10 DEG C, is incubated 50 hours;
When being 5. cooled to 400 DEG C with the speed stove of≤50 DEG C/h, then with the speed stove of≤20 DEG C/h be cooled to≤200 DEG C time, Air cooling is to room temperature afterwards;
(6) forging's block dimension inspection and mark
Specify, by Forging Technology, each shelves size examined the forged pieces and forging is identified;
(7) roughing and inspection and mark
By a roughing process stipulation, forging is carried out turnery processing, check each shelves size and identify;
(8) ultrasonic examination (UT)
Forging after roughing is carried out ultrasonic examination, and ultrasonic examination is entered by the regulation of EN10308-3 credit rating 3 OK;
(9) positive tempering heat treatment
Forging after roughing is carried out positive tempering heat treatment, the steps include:
1., after forging is heated to 1000 DEG C ± 20 DEG C, it is incubated >=6 hours;
2. by forging air cooling to room temperature;
3. forging is reheated to 700 DEG C ± 20 DEG C again, is incubated 8 hours;
The most then forging stove is cooled to room temperature;
Can obtain being narrower than the crystal grain of more than 6 grades by positive tempering heat treatment;
(10) mechanical property heat treatment
Align the forging after tempering heat treatment and carry out mechanical property heat treatment, the steps include:
1. quench, forging is heated to 1100 DEG C ± 20 DEG C, be incubated 4 hours;
The most then forging oil is cooled to < 80 DEG C;
The most once it is tempered, forging is heated to 570 DEG C ± 20 DEG C, be incubated 4 hours;
The most then by forging air cooling to room temperature;
5. double tempering, is heated to 700 DEG C ± 20 DEG C by forging, is incubated 4 hours;
The most then by forging air cooling to room temperature;
(11) secondary roughing and inspection and mark
By secondary roughing process stipulation, forging is carried out turnery processing, check each shelves size and identify;
(12) ultrasonic examination (UT)
Forging after secondary roughing is carried out ultrasonic examination, and ultrasonic examination is entered by the regulation of EN10308-3 credit rating 3 OK;
(13) sample is extracted
Mechanical property sample is extracted by secondary roughing process stipulation;
(14) Mechanics Performance Testing and metallographic structure inspection
Ambient temperature mechanical properties is tested: extracts sample by the requirement of roughing figure in appointed part and carries out Mechanics Performance Testing, surveys Examination includes: yield strength, tensile strength, elongation percentage, shrinkage factor, proper shellfish (v-notch) ballistic work, hardness etc.;
Mechanical behavior under high temperature is tested: test high-temperature instantaneous mechanical property and creep rupture strength;
Metallographic structure checks: check field trash and grain size;
(15) examination and test of products is payed into the treasury
After the assay was approved, product has i.e. been accused and has payed into the treasury.
The manufacture method of 13Cr9Mo2Co1NiVNbNB steel forgings the most according to claim 1, it is characterised in that in step (4), during forging, the bar portion of the valve disc of supercritical turbine group should use pulling operation, and the head of valve disc should use tire Mould carries out gathering stock.
The manufacture method of 13Cr9Mo2Co1NiVNbNB steel forgings the most according to claim 1, it is characterised in that in step (4), during forging, the valve seat of supercritical turbine group should use saddle forging operation, and cross section each to valve seat forging stock is carried out Sufficiently forging deformation, until by the forging of valve seat forging stock to the forging's block dimension set.
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CN102248357B (en) * 2010-05-20 2014-06-11 上海重型机器厂有限公司 Method for manufacturing low-pressure rotor of megawatt-grade supercritical steam turbine unit
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