CN102719761A - Wheel disc forging and manufacturing method thereof - Google Patents
Wheel disc forging and manufacturing method thereof Download PDFInfo
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- CN102719761A CN102719761A CN2011104496290A CN201110449629A CN102719761A CN 102719761 A CN102719761 A CN 102719761A CN 2011104496290 A CN2011104496290 A CN 2011104496290A CN 201110449629 A CN201110449629 A CN 201110449629A CN 102719761 A CN102719761 A CN 102719761A
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- 238000005242 forging Methods 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 238000000137 annealing Methods 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 18
- 238000009413 insulation Methods 0.000 claims description 14
- 239000002893 slag Substances 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 238000009987 spinning Methods 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 8
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 238000005496 tempering Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000470 constituent Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- 229910000734 martensite Inorganic materials 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 229910001563 bainite Inorganic materials 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000010080 roll forging Methods 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000009864 tensile test Methods 0.000 claims description 4
- 238000010891 electric arc Methods 0.000 claims description 3
- 238000009863 impact test Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 230000002349 favourable effect Effects 0.000 claims description 2
- 230000007704 transition Effects 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a wheel disc forging and a manufacturing method thereof and belongs to the technical field of mechanical manufacture. The manufacturing method further optimizes material components, controls the upper limits of C and Mn content, improves Ni content, reduces content of harmful P and S, reduces Si content and temper brittleness of Mn, utilizes an electroslag remelting process so that the purity of molten steel is improved, and utilizes post-forging heat treatment comprising two normalizing processes so that materials are further homogenized and grains are fined. Raw materials adopted by the manufacturing method comprise C, Mn, Si, P, S, Cr, Ni, Al, Cu and Fe. The manufacturing method comprises the following steps of electrode blank smelting, electroslag remelting smelting, steel ingot annealing, steel ingot forging, post-forging heat treatment, property heat treatment, and property and microstructure examination. The wheel disc forging obtained by the manufacturing method and the manufacturing method have the advantages that a ratio of chemical components is reasonable; material purity is high; forging effects on the core are good; density of the metal microstructure is good; and the problems that a wheel disc forging obtained by the existing manufacturing method is unqualified in the forging flaw detection and a mechanical property especially such as a material ductile-brittle transition temperature does not satisfy the requirement are solved.
Description
Technical field
The invention belongs to machinery manufacturing technology field, relate to the method for manufacture of the crucial forging of a kind of gas turbine group.
Background technology
1, present, the ingredient standard that the gas turbine wheel disk forging adopts is different, and principal element composition ranges such as ubiquity C, Mn, Cr, Mo are bigger, need carry out internal control to the principal element composition.
2, traditional gas turbine wheel disk forging adopts following production technique:
(1) smelts: EBT (electric arc furnace)+LF refining+VD vacuum outgas, the steel ingot of making a bet;
(2) forge: the flat-die forging pressing machine forges, and pulling, pier be thick, go out finished product, and total forging ratio is greater than 3;
(3) conditioning heat treatment: normalizing+tempering;
(4) property heat treatment: quenching+temper
3, the shortcoming of traditional technology is:
(1), because traditional smelting technology lacks the electroslag smelting process, therefore be difficult to guarantee purity, the requirement of molten steel, the wash heat process through electroslag can further reduce the inclusion rank of material and reduce metallurgical imperfection such as steel ingot component segregation;
(2), because traditional forging process lacks the spinning forging process, make that to receive tensile stress that material heart portion be difficult for to be forged in the heart portion deformation process real, be difficult to guarantee the heart portion flaw detection requirement of wheel disc forging.
(3), traditional forging post-heat-treated is owing to adopt a normalizing treatment; Comparatively thick and be prone to exist mixed grain structure; And novel process adopted double normalizing to handle not only to make composition more homogenizing eliminate the microsegregation step refining crystal grain of going forward side by side; The influence of elimination mixed crystal is prepared for modifier treatment provides the tissue that is complementary.
(4), traditional hardening and tempering process do not adopt shrend to arrive the deep cooling quenching technology of room temperature, so forging is difficult to through hardening, thus mechanical property especially ductile-brittle transition temperature be difficult to satisfy technical requirements.
Summary of the invention
The purpose of this invention is to provide a kind of wheel disc forging and ME, lack the electroslag smelting process, be difficult to guarantee the purity of molten steel to solve prior art; Lack the spinning forging process, make to receive tensile stress to make material heart portion be difficult for forging in fact in the heart portion deformation process, be difficult to guarantee the heart portion flaw detection requirement of wheel disc forging.Forge post-heat-treated and adopt a normalizing treatment, comparatively thick and be prone to exist mixed grain structure.Hardening and tempering process does not adopt shrend to arrive the deep cooling quenching technology of room temperature, so forging is difficult to through hardening, thus mechanical property especially ductile-brittle transition temperature be difficult to satisfy problems such as technical requirements.
The technical solution adopted for the present invention to solve the technical problems is that the forging component content is further optimized, and control C, the Mn constituent content upper limit improve the Ni constituent content, reduce P, S harmful element content, reduce elements Si content; Increase electroslag remelting process, adopt double normalizing to handle through forging post-heat-treated; Its component content weight percent is:
C:0.25%-0.28%, Mn:0.30%-0.35%, Si≤0.020%, P≤0.012%, S≤0.010%, Cr:1.45%-1.55%, Ni:2.70%-2.80%, Al: Cu≤0.015%: all the other element of Fe≤0.20%.
Its process step is following:
The electrode base is smelted:
Adopt electric arc furnace smelting (EAF)+electric furnace refining (LF)+vacuum outgas (VD);
Inspection by sampling: ladle sample analytical chemistry composition meets the composition requirement, VD end temp VD tapping temperature: 1550～1570 ℃. gas content H≤1.5ppm, O≤50ppm, N≤80ppm
The cast of electrode base:
The employing argon shield is made a bet;
Electric slag refusion and smelting: the electroslag remelting process parameter is:
A, slag system: adopt 2 yuan of slag systems, i.e. aluminum oxide 28%-32%, Calcium Fluoride (Fluorspan) improves 68%-72%.
B, packing ratio: adopt the remelting of three-phase electricity slag hearth, packing ratio is controlled between the 0.22-0.24.
C, mold water temperature: mold outlet water temperature is controlled between 30 ℃-60 ℃.
D, dry air total process protective: 3.7-.8m3/min, dry air humidity＜0.1g/m3.
E, reductor: the AL grain added once weight 80-100g in per 5 minutes.
Steel ingot annealing: annealed 25-28 hour for 680 ℃ ± 10 ℃.
Steel ingot forges: divide five fire to forge, concrete parameter is following:
Heating before forging: 1240 ± 10 ℃ of insulation 10-16h;
Forging range: 1240 ℃-800 ℃.
First fire: steel ingot pressing tongs handle, round as a ball, pulling is to 600 all directions, and blanking 1250 is long, and clout is gone into stove;
Second fire: pull out to 400 all directions, blanking 890 length/parts, clout is gone into stove;
The 3rd fire: jumping-up is to H=330--φ 670, and roll forging is to H=630--φ 485;
The 4th fire: spinning is to H=400--φ 600, and is round as a ball;
The 5th fire: spinning to final dimension: H+265--φ 730
Forge post-heat-treated:
In order to provide favorable tissue to guarantee to property heat treatment, forge post-heat-treated and adopt double normalizing to add the forging post-heat-treated technology that expands hydrogen annealing, it is even further to reach structural constituent, grain refining effect, and eliminate white point hidden danger.
Normalizing for the first time: 920 ± 15 ℃, be incubated >=4 hours, air cooling;
2, for the second time normalizing: 850-870 ℃, be incubated >=6 hours, air cooling;
3, expand hydrogen annealing: 640-660 ℃, be incubated >=40 hours;
Property heat treatment:
Through the fully cooling of quenching material structure is changed fully, the complete through hardening of heart portion, forging obtains the tempered martensite or the tempering bainite tissue of homogeneous.
Austenitizing: 840-850 ℃ insulation, soaking time >=5 hour;
Cooling: 1. quenchant: water.Water-cooled time 40min.
2. water temperature 20-25 ℃.
3. stir in the water-cooled process.
4. 20 minutes thermometrics after the water outlet, workpiece surface position temperature is wanted≤149 ℃.
Performance and tissue check:
Hardness: test by GB/T230-2004.
Stretch: GB/T 228 metallic substance tensile test at room temperature methods.
Impact: the 229 metallic substance summers of GB/T are than pendulum impact test method.
Grain fineness number: GB/T 6394 metal mean grain size measuring methods.
Microstructure: GB/T 13320 steel stamp work metallographic structures grading figure and assessment method.
Adopt positively effect of the present invention to be:
The Chemical Composition reasonable ratio, the material purity is good; Heart portion forges real effective; The density of metal structure is good;
Specific targets are:
Modulation back hardness: HB293-341 (Hs43-50);
Tensile strength: σ
b: 999MPa-1137Mpa;
Ys: σ s >=758Mpa;
Unit elongation: A >=50%;
Relative reduction in area: Z >=35%;
Ductile-brittle transition temperature: FATT (50%)≤33 ℃;
The intensity consistence: the intensity difference of the tensile strength of coupon and forging body should≤68N/mm2, if forging only needs a tensile test bar or only needs check hardness, the HB value difference on the forging body should be less than 20HB).
Metallographic examination: reach 3 grades of autstenitic grain sizes or better, be organized as tempered martensite or tempering shellfish body tissue.
Adopt the present invention to improve material hardening capacity and comprehensive mechanical property through optimizing components; Effectively raise the purity of molten steel through electroslag remelting process; Research and development, improvement through Forging Technology make the forging tissue obtain homogenizing, and heart portion fully forges; Through 2 normalizing process forging post-heat-treated material has been homogenized and refinement crystal grain; Optimization through quenching technology fully changes the microstructure of forging, thereby solved the especially material ductile-brittle transition temperature problem that can't meet the demands of the defective and mechanical property of forging flaw detection.
Description of drawings
[0028] the present invention is further specified with implementing below in conjunction with accompanying drawing:
Accompanying drawing 1 is process flow sheet of the present invention.
Embodiment
Embodiment one
The electrode base is smelted:
Inspection by sampling: ladle sample analytical chemistry composition, component content is:
C：0.256%、Mn：0.32%、Si：0.019%、P：0.009%、S：0.006%、Cr：1.48%、Ni：2.72%、Al：0.014%、Cu：0.16%、Fe：95.16%。
VD end temp VD tapping temperature: 1555 ℃. gas content H:1.2ppm, O:45ppm, N≤78ppm
Electrode base cast: adopt argon shield to make a bet;
Electric slag refusion and smelting: the electroslag remelting process parameter is:
A, slag system: aluminum oxide 30%, Calcium Fluoride (Fluorspan) improves 70%.
B, packing ratio: packing ratio: 0.23.
C, mold water temperature: 40 ℃ of mold outlet water temperatures.
D, dry air total process protective: 4.3m3/min, dry air humidity: 0.68g/m3.
E, reductor: the AL grain added once weight 90g in per 5 minutes.
Steel ingot annealing: annealed 26 hours for 682 ℃.
Steel ingot forges: divide five fire to forge, concrete parameter is following:
Heating before forging: 1242 ℃ of insulation 11h;
First fire: steel ingot pressing tongs handle, round as a ball, pulling is to 600 all directions, and blanking 1250 is long, and clout is gone into stove;
Second fire: pull out to 400 all directions, blanking 890 length/parts, clout is gone into stove;
The 3rd fire: jumping-up is to H=330--φ 670, and roll forging is to H=630--φ 485;
The 4th fire: spinning is to H=400--φ 600, and is round as a ball;
The 5th fire: spinning to final dimension: H+265--φ 730
Forge post-heat-treated:
Normalizing for the first time: 922 ℃, insulation: 7 hours, air cooling;
Normalizing for the second time: 870 ℃, insulation: 10 hours, air cooling;
Expand hydrogen annealing: 640 ℃, insulation: 42 hours;
Property heat treatment: through the fully cooling of quenching material structure is changed fully, the complete through hardening of heart portion, forging obtains the tempered martensite or the tempering bainite tissue of homogeneous.
Austenitizing: 841 ℃ of insulations, soaking time: 6 hours;
Cooling: 1. quenchant: water.Water-cooled time 40min.
2. water temperature is 21 ℃.
3. stir in the water-cooled process.
4. 20 minutes thermometrics after the water outlet, workpiece surface position temperature: 80 ℃.
Embodiment two
1, the electrode base is smelted:
Inspection by sampling: ladle sample analytical chemistry composition, component content is:
C：0.276%、Mn：0.34%、Si：0.017%、P：0.010%、S：0.007%、Cr：1.53%、Ni：2.76%、Al：0.012%、Cu：0.14%、Fe：95.31%。
VD end temp VD tapping temperature: 1565 ℃. gas content H:1.1ppm, O:32ppm, N≤68ppm
2, electrode base cast: adopt argon shield to make a bet;
3, electric slag refusion and smelting: the electroslag remelting process parameter is:
A, slag system: aluminum oxide 30.5%, Calcium Fluoride (Fluorspan) improves 69.5%.
B, packing ratio: packing ratio: 0.23.
C, mold water temperature: 40 ℃ of mold outlet water temperatures.
D, dry air total process protective: 4.5m3/min, dry air humidity: 0.67g/m3.
E, reductor: the AL grain added once weight 90g in per 5 minutes.
4, steel ingot annealing: annealed 26 hours for 685 ℃.
5, steel ingot forges: divide five fire to forge, concrete parameter is following:
Heating before forging: 1241 ℃ of insulation 16h;
First fire: steel ingot pressing tongs handle, round as a ball, pulling is to 600 all directions, and blanking 1250 is long, and clout is gone into stove;
Second fire: pull out to 400 all directions, blanking 890 length/parts, clout is gone into stove;
The 3rd fire: jumping-up is to H=330--φ 670, and roll forging is to H=630--φ 485;
The 4th fire: spinning is to H=400--φ 600, and is round as a ball;
The 5th fire: spinning to final dimension: H+265--φ 730.
6, forge post-heat-treated:
Normalizing for the first time: 923 ℃, insulation: 7 hours, air cooling;
Normalizing for the second time: 862 ℃, insulation: 10 hours, air cooling;
Expand hydrogen annealing: 650 ℃, insulation: 42 hours;
7, property heat treatment: through the fully cooling of quenching material structure is changed fully, the complete through hardening of heart portion, forging obtains the tempered martensite or the tempering bainite tissue of homogeneous.
Austenitizing: 845 ℃ of insulations, soaking time: 6 hours;
Cooling: 1. quenchant: water.Water-cooled time 40min.
2. water temperature is 21 ℃.
3. stir in the water-cooled process.
4. 20 minutes thermometrics after the water outlet, workpiece surface position temperature: 62 ℃.
8, performance and tissue check:
Hardness: test by GB/T230-2004.
Stretch: GB/T 228 metallic substance tensile test at room temperature methods.
Impact: the 229 metallic substance summers of GB/T are than pendulum impact test method.
Grain fineness number: GB/T 6394 metal mean grain size measuring methods.
Microstructure: GB/T 13320 steel stamp work metallographic structures grading figure and assessment method.
Claims (2)
1. wheel disc forging is characterized in that this forging further optimizes material composition content, and control C, the Mn constituent content upper limit improve the Ni constituent content, reduce P, S harmful element content, reduces Si content to reduce the temper brittleness with the Mn element; Increase the purity that electroslag remelting process improves molten steel, through forge that post-heat-treated is adopted double normalizing to handle material has been homogenized and refinement crystal grain; Its forging component content or weight percent are:
C:0.25%-0.28%, Mn:0.30%-0.35%, Si≤0.020%, P≤0.012%, S≤0.010%, Cr:1.45%-1.55%, Ni:2.70%-2.80%, Al; ≤0.015%, Cu: all the other element of Fe≤0.20%.
2. wheel disc forging ME is characterized in that manufacturing technology steps is following:
1) the electrode base is smelted:
Adopt electric arc furnace smelting (EAF)+electric furnace refining (LF)+vacuum outgas (VD);
Inspection by sampling: ladle sample analytical chemistry composition meets the composition requirement, VD end temp VD tapping temperature: 1550～1570 ℃. gas content H≤1.5ppm, O≤50ppm, N≤80ppm
2) electrode base cast: adopt argon shield to make a bet;
3) electric slag refusion and smelting: the electroslag remelting process parameter is:
A, slag system: adopt 2 yuan of slag systems, i.e. aluminum oxide 28%-32%, Calcium Fluoride (Fluorspan) improves 68%-72%;
B, packing ratio: adopt the remelting of three-phase electricity slag hearth, packing ratio is controlled between the 0.22-0.24;
C, mold water temperature: mold outlet water temperature is controlled between 30 ℃-60 ℃;
D, dry air total process protective: 3.7-.8m3/min, dry air humidity＜0.1g/m3;
E, reductor: the AL grain added once weight 80-100g in per 5 minutes;
4) steel ingot annealing: annealed 25-28 hour for 680 ℃ ± 10 ℃;
5) steel ingot forges: divide five fire to forge, concrete parameter is following:
Heating before forging: 1240 ± 10 ℃ of insulation 10-16h;
Forging range: 1240 ℃-800 ℃;
First fire: steel ingot pressing tongs handle, round as a ball, pulling is to 600 all directions, and blanking 1250 is long, and clout is gone into stove;
Second fire: pull out to 400 all directions, blanking 890 length/parts, clout is gone into stove;
The 3rd fire: jumping-up is to H=330--Φ 670, and roll forging is to H=630-Φ 485;
The 4th fire: spinning is to H=400--Φ 600, and is round as a ball;
The 5th fire: spinning to final dimension: H+265--Ф 730
6) forge post-heat-treated:, favorable tissue guarantees that forge post-heat-treated and adopt double normalizing to add the forging post-heat-treated technology that expands hydrogen annealing, it is even further to reach structural constituent for being provided to property heat treatment, grain refining effect, and eliminate white point hidden danger;
Normalizing for the first time: 920 ± 15 ℃, be incubated >=4 hours, air cooling;
Normalizing: 850-870 ℃ for the second time, be incubated >=6 hours, air cooling;
Expand hydrogen annealing: 640-660 ℃, be incubated >=40 hours;
7) property heat treatment: through the fully cooling of quenching material structure is changed fully, the complete through hardening of heart portion, forging obtains the tempered martensite or the tempering bainite tissue of homogeneous;
Austenitizing: 840-850 ℃ insulation, soaking time >=5 hour;
Cooling: a: quenchant: water: water-cooled time 40min;
B: water temperature 20-25 ℃;
C: stir in the water-cooled process;
D: 20 minutes thermometrics after the water outlet, workpiece surface position temperature is wanted≤149 ℃;
8) performance and tissue check:
Hardness: test by GB/T230-2004;
Stretch: GB/T 228 metallic substance tensile test at room temperature methods;
Impact: the 229 metallic substance summers of GB/T are than pendulum impact test method;
Grain fineness number: GB/T 6394 metal mean grain size measuring methods;
Microstructure: GB/T 13320 steel stamp work metallographic structures grading figure and assessment method.
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| CN2011104496290A CN102719761B (en) | 2011-12-29 | 2011-12-29 | Wheel disc forging and manufacturing method thereof |
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|---|---|---|---|
| CN2011104496290A CN102719761B (en) | 2011-12-29 | 2011-12-29 | Wheel disc forging and manufacturing method thereof |
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| CN110819761A (en) * | 2019-11-26 | 2020-02-21 | 二重（德阳）重型装备有限公司 | Bottom pouring steel ingot or electrode blank and preparation method thereof |
| CN112008031A (en) * | 2020-08-25 | 2020-12-01 | 无锡继平锻造有限公司 | Forging and heat treatment process of valve body for shale gas exploitation |
| CN112658605A (en) * | 2020-12-11 | 2021-04-16 | 无锡市星达石化配件有限公司 | Machining process for oversized outer circular flange |
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| CN115109986A (en) * | 2022-07-11 | 2022-09-27 | 中国铁建重工集团股份有限公司 | Large-size electroslag remelting high manganese steel forging stock and manufacturing method thereof |
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