CN104907470A - 13Cr9Mo2Co1NiVNbNB steel forged piece manufacturing method - Google Patents
13Cr9Mo2Co1NiVNbNB steel forged piece manufacturing method Download PDFInfo
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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
Technical field
The present invention relates to Forging Technology technical field, specifically, is a kind of manufacture method of novel ferritic stainless steel (13Cr9Mo2Co1NiVNbNB) forging.
Background technology
CO
2the environmental problem that discharge causes day by day by the whole world is paid close attention to, and adopts and develops important, the effective measure that supercritical technology is current various countries minimizing CO2 discharge.Improving vapor (steam) temperature can make the efficiency of steam turbine effectively be promoted, and reduces coal consumption and CO2 discharge.Europe and Japan are that employing and development supercritical technology have developed 620 ~ 630 DEG C of ultra supercritical heat-resisting steel materials in succession.China is also designing, is manufacturing the supercritical turbine group that reheat steam temperature is 620 DEG C now.This respect, higher steam parameter proposes more harsh requirement to power station steel, only has the suitable material obtaining and have enough creep strengths, as 13Cr9Mo2Co1NiVNbNB ferritic stainless steel, just can complete the design and manufaction of supercritical turbine group, implementation efficiency increases.
13Cr9Mo2Co1NiVNbNB steel belongs to boracic nitrogenous steel, its ability 620 DEG C of high temperature, long time creep strength, there is good antioxygenic property and processing performance, production and the application of the important spare part of 1,000,000 grade supercritical turbine groups can be used for.But the steel grades of 13Cr9Mo2Co1NiVNbNB steel is complicated, alloying element is numerous, smelt difficulty greatly, and the crackle tendency of this material is large, and solderability is poor, not easily grasps by the method that it manufactures forging.
There is no 13Cr9Mo2Co1NiVNbNB steel before China, its manufacturing process such as forging and heat treatment is scarcely acquainted with equally.And manufacturing process conventional before adopting carries out production and processing to 13Cr9Mo2Co1NiVNbNB steel, cause forging grain size thick, not only cannot ensure the quality of forging inside, the uniformity of forging tissue, and cannot meet that parts reply is long-time to be run and the properties requirements such as the ambient temperature mechanical properties of needs, metallographic structure, elevated temperature tensile, persistence in the adverse circumstances such as high temperature, oxidation, high load capacity, alternate stress.Manufacturing supercritical turbine group parts with 13Cr9Mo2Co1NiVNbNB steel, in the process as valve disc, valve seat, valve rod, cause waste meaningless in a large number.
Summary of the invention
The object of the invention is to overcome above-mentioned weak point, a kind of manufacture method of 13Cr9Mo2Co1NiVNbNB steel forgings is provided, can make to utilize 13Cr9Mo2Co1NiVNbNB steel to manufacture supercritical turbine group parts by the method, as valve disc, valve seat, valve rod are completed smoothly: 13Cr9Mo2Co1NiVNbNB steel ingot is through abundant forging deformation, heat treatment after forging and property heat treatment, make it the requirements that forging can meet supercritical turbine group parts technical specification, and processing technology is reasonable, forging qualification rate is high, waste meaningless before avoiding.
For achieving the above object, this invention takes following technical scheme.
A manufacture method for 13Cr9Mo2Co1NiVNbNB steel forgings, is characterized in that, comprises following steps:
(1) raw material steel ingot inspection
The inspection of raw and process materials is carried out to the 13Cr9Mo2Co1NiVNbNB steel ingot adopted;
(2) Heating Steel Ingots
Heat 13Cr9Mo2Co1NiVNbNB steel ingot, its treatment step is:
steel ingot is placed in≤heating furnace of 600 DEG C is incubated, and temperature retention time is no less than 2 hours;
with the heating rate of≤50 ± 10 DEG C/h, make steel ingot be heated to 900 ± 20 DEG C slowly, the heat time is no less than 6 hours;
again with the heating rate of≤70 ± 10 DEG C/h, make steel ingot be heated to 1160 ± 20 DEG C slowly, the heat time is no less than 3.8 hours;
be incubated after steel ingot reaches 1160 ± 20 DEG C, temperature retention time is no less than 3.5 hours;
By heating the initial forging temperature making 13Cr9Mo2Co1NiVNbNB steel ingot reach required;
(3) cogging of steel ingot and blanking
1. 13Cr9Mo2Co1NiVNbNB Heating Steel Ingots is carried out upsetting pull distortion to austenite structure state;
2. the method adopting die heat to cut carries out blanking by the regulation of Forging Technology to steel ingot;
(4) forge
initial forging temperature is 1160 DEG C, and final forging temperature is 850 DEG C; Each heat time>=1 hour;
2 ~ 3 upsetting pulls are carried out to forging stock, make forging ratio to reach needed for technique>=3.5;
end two fire time forging, adopts end two fire time to carry out sub-material to forging stock, to each cross section reserve>=deflection of 30% to be to ensure the deflection in last fire time each cross section;
time forging of last fire, controls forging stock temperature at 1180 DEG C and ensures heat penetration;
(5) heat treatment after forging
Annealing heat treatment is carried out to forging stock, 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 is not limit, 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 is not limit, and is warming up to 650 DEG C ± 10 DEG C, is incubated 50 hours;
When being 5. chilled to 400 DEG C with the speed stove of≤50 DEG C/h, then with the speed stove of≤20 DEG C/h be chilled 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 of examining the forged pieces and forging is identified;
(7) roughing and inspection and mark
By a roughing process stipulation, turnery processing is carried out to forging, check each shelves size and identify;
(8) first time ultrasonic examination (UT)
Carry out ultrasonic examination to the forging after a roughing, ultrasonic examination is undertaken by the regulation of EN10308-3 credit rating 3;
(9) positive tempering heat treatment
Positive tempering heat treatment is carried out to the forging after a roughing, the steps include:
1., after forging is heated to 1000 DEG C ± 20 DEG C, >=6 hours are incubated;
2. by forging air cooling to room temperature;
3. forging is reheated to 700 DEG C ± 20 DEG C again, be incubated 8 hours;
4. then forging stove is chilled to room temperature;
The crystal grain being narrower than more than 6 grades can be obtained 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;
2. then by forging oil cooling to < 80 DEG C;
3. a tempering, is heated to 570 DEG C ± 20 DEG C by forging, be incubated 4 hours;
4. then by forging air cooling to room temperature;
5. double tempering, is heated to 700 DEG C ± 20 DEG C by forging, be incubated 4 hours;
6. then by forging air cooling to room temperature;
(11) secondary roughing and inspection and mark
By secondary roughing process stipulation, turnery processing is carried out to forging, check each shelves size and identify;
(12) second time ultrasonic examination (UT)
Carry out ultrasonic examination to the forging after secondary roughing, ultrasonic examination is undertaken by the regulation of EN10308-3 credit rating 3;
(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: extract sample by the requirement of roughing figure in appointed part and carry out Mechanics Performance Testing, test comprises: yield strength, tensile strength, percentage elongation, shrinkage factor, just 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, namely product has been accused and has been payed into the treasury.
Further, adopt manufacture method of the present invention to forge valve disc, in the process that step (4) is forged, the bar portion of valve disc should adopt pulling operation, and the head of valve disc should adopt loose tool to carry out gathering stock.
Further, adopt manufacture method of the present invention to forge valve seat, in the process that step (4) is forged, saddle forging operation should be adopted, sufficient forging deformation is carried out to each cross section of valve seat forging stock, 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 and utilize 13Cr9Mo2Co1NiVNbNB steel to manufacture supercritical turbine group parts, as the forging method of valve disc, valve seat, valve rod, and processing technology is reasonable, and forging qualification rate is high, waste meaningless before avoiding.
(2) for China designs, manufactures supercritical turbine group and done the deposit of basic technology, its economic benefit clearly.
(3) be conducive to production and the application of China's supercritical turbine group, be conducive to China CO
2reduction of discharging.
(4) be conducive to Chinese Enterprise and enter international market, improve the competitiveness of Chinese products 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
Provide the detailed description of the invention of the manufacture method of 13Cr9Mo2Co1NiVNbNB steel forgings of the present invention below in conjunction with accompanying drawing, but it is noted that enforcement of the present invention is not limited to following embodiment.
embodiment 1
A manufacture method for 13Cr9Mo2Co1NiVNbNB steel forgings, comprises following steps (see Fig. 1):
(1) raw material steel ingot inspection
The inspection of raw and process materials is carried out to the 13Cr9Mo2Co1NiVNbNB steel ingot adopted, comprises the inspection of reinspection to chemical composition and surface of steel ingot.
(2) Heating Steel Ingots (see Fig. 2)
Heat 13Cr9Mo2Co1NiVNbNB steel ingot, its treatment step is:
steel ingot is placed in≤heating furnace of 600 DEG C is incubated, and temperature retention time is no less than 2 hours.
with the heating rate of≤50 ± 10 DEG C/h, make steel ingot be heated to 900 ± 20 DEG C slowly, the heat time is no less than 6 hours.
again with the heating rate of≤70 ± 10 DEG C/h, make steel ingot be heated to 1160 ± 20 DEG C slowly, the heat time is no less than 3.8 hours.
be incubated after steel ingot reaches 1160 ± 20 DEG C, temperature retention time is no less than 3.5 hours.
The initial forging temperature making 13Cr9Mo2Co1NiVNbNB steel ingot reach required is processed by " Heating Steel Ingots ".
(3) cogging of steel ingot and blanking
1. 13Cr9Mo2Co1NiVNbNB Heating Steel Ingots is carried out upsetting pull distortion to austenite structure state.
2. the method adopting die heat to cut carries out blanking by the regulation of Forging Technology to steel ingot.
(4) forge
initial forging temperature is 1160 DEG C, and final forging temperature is 850 DEG C; Each heat time>=1 hour.
2 ~ 3 upsetting pulls are carried out to forging stock, make forging ratio to reach needed for technique>=3.5.
end two fire time forging, adopts end two fire time to carry out sub-material to forging stock, to each cross section reserve>=deflection of 30% to be to ensure the deflection in last fire time each cross section.
time forging of last fire, controls forging stock temperature at 1180 DEG C, can suitably improve 20 DEG C and ensure heat penetration.
If forging valve disc, the bar portion of valve disc should adopt pulling operation, and the head of valve disc should adopt loose tool to carry out gathering stock (see Fig. 5).
If forging valve seat, saddle forging operation should be adopted, sufficient forging deformation is carried out to each cross section of valve seat forging stock, until by the forging of valve seat forging stock to the forging ' s block dimension set.
(5) heat treatment after forging
Annealing heat treatment is carried out to forging stock, 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 is not limit, 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 is not limit, and is warming up to 650 DEG C ± 10 DEG C, is incubated 50 hours.
When being 5. chilled to 400 DEG C with the speed stove of≤50 DEG C/h, then with the speed stove of≤20 DEG C/h be chilled 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 of examining the forged pieces and forging is identified.
(7) roughing and inspection and mark
By a roughing process stipulation, turnery processing is carried out to forging, check each shelves size and identify.
(8) first time ultrasonic examination (UT)
Carry out ultrasonic examination to the forging after a roughing, ultrasonic examination is undertaken by the regulation of EN10308-3 credit rating 3.
(9) positive tempering heat treatment
Positive tempering heat treatment is carried out to the forging after a roughing, the steps include:
1., after forging is heated to 1000 DEG C ± 20 DEG C, >=6 hours are incubated.
2. by forging air cooling to room temperature.
3. forging reheats to 700 DEG C ± 20 DEG C again, is incubated 8 hours.
4. then forging stove is chilled to room temperature (implication of " stove is cold " is: after forging insulation terminates, close fire door, cut off heat-treatment furnace power supply, forging in heat treatment burner hearth along with furnace temperature is cooled to room temperature together) (see Fig. 3).
The crystal grain being narrower than more than 6 grades can be obtained by the positive tempering heat treatment of step (9).
(10) mechanical property heat treatment (see 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.
2. then by forging oil cooling to < 80 DEG C.
3. a tempering, is heated to 570 DEG C ± 20 DEG C by forging, be incubated 4 hours.
4. then by forging air cooling to room temperature.
5. double tempering, is heated to 700 DEG C ± 20 DEG C by forging, be incubated 4 hours.
6. then by forging air cooling to room temperature.
(11) secondary roughing and inspection and mark
By secondary roughing process stipulation, turnery processing is carried out to forging, check each shelves size and identify.
(12) second time ultrasonic examination (UT)
Carry out ultrasonic examination to the forging after secondary roughing, ultrasonic examination is undertaken by the regulation of EN10308-3 credit rating 3.
(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: extract sample by the requirement of roughing figure in appointed part and carry out Mechanics Performance Testing, test comprises: yield strength, tensile strength, percentage elongation, shrinkage factor, just shellfish (v-notch) ballistic work, hardness.Concrete Mechanics Performance Testing value is in table 1.
table 1. Mechanics Performance Testing value
，
Note: * is the mean value of 3 impact specimens, allows one of them sample ballistic work lower than setting, but should lower than 17J.
mechanical behavior under high temperature is tested: test high-temperature instantaneous mechanical property and creep rupture strength.Concrete Mechanics Performance Testing value is 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 no more than 2 grades with the deviation of mean grain size.
Forging A, B, C, D, DS five type field trash all should more than 2.5 grades.
(15) examination and test of products is payed into the treasury
After the assay was approved, namely product has been accused and has been payed into the treasury.
Know in enforcement of the present invention:
(1) Forging Technology and Technology for Heating Processing are to the performance impact of 13Cr9Mo2Co1NiVNbNB steel very greatly, and because the resistance of deformation of 13Cr9Mo2Co1NiVNbNB steel is large, need many fire secondary during forging, 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 the key factors being related to forging quality.
(3) the positive tempering heat treatment in forging process can obtain the uniform formation that ferrite adds carbide, can make the further refinement of grain size, can guarantee subsequently mechanical property heat treatment austenitizing time carbide can fully dissolve.
to the test of the 13Cr9Mo2Co1NiVNbNB steel forgings that embodiment 1 is processed:
By SQB44.35-2014 technical standard, the 13Cr9Mo2Co1NiVNbNB steel valve seat adopting the method for testing of embodiment 1 step (14) to process embodiment 1 and valve disc forging are tested.
Test result is as follows:
table 4. the mechanical property of the 13Cr9Mo2Co1NiVNbNB steel valve seat that embodiment 1 is processed and valve disc forging
。
table 5. the high-temperature instantaneous mechanical property of the 13Cr9Mo2Co1NiVNbNB steel valve seat that embodiment 1 is processed and valve disc forging
。
table 6. the creep rupture strength of the 13Cr9Mo2Co1NiVNbNB steel valve seat that embodiment 1 is processed and valve disc forging
。
table 7. the field trash of the 13Cr9Mo2Co1NiVNbNB steel valve seat that embodiment 1 is processed and valve disc forging and grain size number
。
The foregoing is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from manufacture method of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. a manufacture method for 13Cr9Mo2Co1NiVNbNB steel forgings, is characterized in that, comprises following steps:
(1) raw material steel ingot inspection
The inspection of raw and process materials is carried out to the 13Cr9Mo2Co1NiVNbNB steel ingot adopted;
(2) Heating Steel Ingots
Heat 13Cr9Mo2Co1NiVNbNB steel ingot, its treatment step is:
steel ingot is placed in≤heating furnace of 600 DEG C is incubated, and temperature retention time is no less than 2 hours;
with the heating rate of≤50 ± 10 DEG C/h, make steel ingot be heated to 900 ± 20 DEG C slowly, the heat time is no less than 6 hours;
again with the heating rate of≤70 ± 10 DEG C/h, make steel ingot be heated to 1160 ± 20 DEG C slowly, the heat time is no less than 3.8 hours;
be incubated after steel ingot reaches 1160 ± 20 DEG C, temperature retention time is no less than 3.5 hours;
By heating the initial forging temperature making 13Cr9Mo2Co1NiVNbNB steel ingot reach required;
(3) cogging of steel ingot and blanking
1. 13Cr9Mo2Co1NiVNbNB Heating Steel Ingots is carried out upsetting pull distortion to austenite structure state;
2. the method adopting die heat to cut carries out blanking by the regulation of Forging Technology to steel ingot;
(4) forge
initial forging temperature is 1160 DEG C, and final forging temperature is 850 DEG C; Each heat time>=1 hour;
2 ~ 3 upsetting pulls are carried out to forging stock, make forging ratio to reach needed for technique>=3.5;
end two fire time forging, adopts end two fire time to carry out sub-material to forging stock, to each cross section reserve>=deflection of 30% to be to ensure the deflection in last fire time each cross section;
time forging of last fire, controls forging stock temperature at 1180 DEG C and ensures heat penetration,
(5) heat treatment after forging
Annealing heat treatment is carried out to forging stock, 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 is not limit, 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 is not limit, and is warming up to 650 DEG C ± 10 DEG C, is incubated 50 hours;
When being 5. chilled to 400 DEG C with the speed stove of≤50 DEG C/h, then with the speed stove of≤20 DEG C/h be chilled 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 of examining the forged pieces and forging is identified;
(7) roughing and inspection and mark
By a roughing process stipulation, turnery processing is carried out to forging, check each shelves size and identify;
(8) ultrasonic examination (UT)
Carry out ultrasonic examination to the forging after a roughing, ultrasonic examination is undertaken by the regulation of EN10308-3 credit rating 3;
(9) positive tempering heat treatment
Positive tempering heat treatment is carried out to the forging after a roughing, the steps include:
1., after forging is heated to 1000 DEG C ± 20 DEG C, >=6 hours are incubated;
2. by forging air cooling to room temperature;
3. forging is reheated to 700 DEG C ± 20 DEG C again, be incubated 8 hours;
4. then forging stove is chilled to room temperature;
The crystal grain being narrower than more than 6 grades can be obtained 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;
2. then by forging oil cooling to < 80 DEG C;
3. a tempering, is heated to 570 DEG C ± 20 DEG C by forging, be incubated 4 hours;
4. then by forging air cooling to room temperature;
5. double tempering, is heated to 700 DEG C ± 20 DEG C by forging, be incubated 4 hours;
6. then by forging air cooling to room temperature;
(11) secondary roughing and inspection and mark
By secondary roughing process stipulation, turnery processing is carried out to forging, check each shelves size and identify;
(12) ultrasonic examination (UT)
Carry out ultrasonic examination to the forging after secondary roughing, ultrasonic examination is undertaken by the regulation of EN10308-3 credit rating 3;
(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: extract sample by the requirement of roughing figure in appointed part and carry out Mechanics Performance Testing, test comprises: yield strength, tensile strength, percentage elongation, shrinkage factor, just 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, namely product has been accused and has been payed into the treasury.
2. the manufacture method of 13Cr9Mo2Co1NiVNbNB steel forgings according to claim 1, it is characterized in that, in the process that step (4) is forged, the bar portion of the valve disc of supercritical turbine group should adopt pulling operation, and the head of valve disc should adopt loose tool to carry out gathering stock.
3. the manufacture method of 13Cr9Mo2Co1NiVNbNB steel forgings according to claim 1, it is characterized in that, in the process that step (4) is forged, the valve seat of supercritical turbine group should adopt saddle forging operation, sufficient forging deformation is carried out to each cross section of valve seat forging stock, until by the forging of valve seat forging stock to the forging ' s block dimension set.
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| CN112746151A (en) * | 2020-12-30 | 2021-05-04 | 安徽省瑞杰锻造有限责任公司 | Normalizing heat treatment process for 50SiMn forging |
| CN113145777A (en) * | 2020-12-31 | 2021-07-23 | 无锡派克新材料科技股份有限公司 | Manufacturing method for improving strength and low-temperature impact property of austenite ferrite duplex stainless steel |
| CN114622127A (en) * | 2022-03-11 | 2022-06-14 | 中国航发北京航空材料研究院 | Preparation method of novel engine oversized fan casing |
| CN114622127B (en) * | 2022-03-11 | 2023-03-24 | 中国航发北京航空材料研究院 | Preparation method of novel engine oversized fan casing |
| CN116713419A (en) * | 2023-06-26 | 2023-09-08 | 重庆新承航锐科技股份有限公司 | Thermal processing method and system for improving mechanical properties of 13Cr10Mo1W1VNbN gas turbine wheel disc forging |
| CN116713419B (en) * | 2023-06-26 | 2024-07-23 | 重庆新承航锐科技股份有限公司 | Thermal processing method and system for improving mechanical properties of 13Cr10Mo1W1VNbN gas turbine wheel disc forging |
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| CN117265440A (en) * | 2023-09-25 | 2023-12-22 | 浙江大隆特材有限公司 | Preparation method of nickel-based superalloy forging |
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