CN102719761B - Wheel disc forging and manufacturing method thereof - Google Patents
Wheel disc forging and manufacturing method thereof Download PDFInfo
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- CN102719761B CN102719761B CN2011104496290A CN201110449629A CN102719761B CN 102719761 B CN102719761 B CN 102719761B CN 2011104496290 A CN2011104496290 A CN 2011104496290A CN 201110449629 A CN201110449629 A CN 201110449629A CN 102719761 B CN102719761 B CN 102719761B
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- 238000005242 forging Methods 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 46
- 230000008569 process Effects 0.000 claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000000137 annealing Methods 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 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
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper 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
- 230000000694 effects Effects 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000009413 insulation Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 12
- 238000009987 spinning Methods 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 9
- 238000005496 tempering Methods 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000012856 packing 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
- 230000008859 change Effects 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 238000013461 design Methods 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
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 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
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 241001062472 Stokellia anisodon 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
- 230000006872 improvement Effects 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
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 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
Classifications
-
- 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
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- Manufacture And Refinement Of Metals (AREA)
- Heat Treatment Of Steel (AREA)
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 manufacture method of the crucial forging of a kind of gas turbine group.
Background technology
1, current, the ingredient standard difference that the gas turbine wheel disk forging adopts, the principal element composition ranges such as ubiquity C, Mn, Cr, Mo are larger, need to carry out internal control to the principal element composition.
2, traditional gas turbine wheel disk forging adopts following production technique:
(1) smelt: the 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+tempering is processed
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 by electroslag can further reduce the inclusion rank of material and reduce the metallurgical imperfection such as ingot composition segregation;
(2), because traditional forging process lacks the spinning forging process, make in the heart section deformation process tension stress make material heart section be difficult for forging real, be difficult to guarantee the heart section flaw detection requirement of wheel disc forging.
(3), traditional forging postheat treatment is owing to adopting a normalizing treatment, comparatively thick and easily have a mixed grain structure, and novel process adopted double normalizing to process not only to make composition more homogenizing eliminate the microsegregation step refining crystal grain of going forward side by side, the impact of elimination mixed crystal, prepare for modifier treatment provides the tissue be 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 meet technical requirements.
Summary of the invention
The purpose of this invention is to provide a kind of wheel disc forging and manufacturing process, lack the electroslag smelting process to solve prior art, be difficult to guarantee the purity of molten steel; Lack the spinning forging process, make tension stress in heart section deformation process make material heart section be difficult for forging in fact, be difficult to guarantee the heart section flaw detection requirement of wheel disc forging.Forge postheat treatment and adopt a normalizing treatment, comparatively thick and easily have a 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 meet the 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 controls C, the Mn constituent content upper limit, improves the Ni constituent content, reduces P, S harmful element content, reduces elements Si content; Increase electroslag remelting process, adopt double normalizing to process by forging postheat treatment; 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 :≤0.015%, Cu :≤0.20%, all the other element of Fe.
Its processing step is as follows:
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 three-phase electric slag furnace remelting, packing ratio is controlled between 0.22-0.24.
C, crystallizer water temperature: crystallizer 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 in every 5 minutes, weight 80-100g.
Ingot annealing: 680 ℃ ± 10 ℃ annealing 25-28 hour.
Steel ingot forges: minute five fire forge, and design parameter is as follows:
Heating before forging: 1240 ± 10 ℃ of insulation 10-16h;
Forging range: 1240 ℃-800 ℃.
The first fire: steel ingot pressing tongs handle, round as a ball, pulling is to 600 all directions, and blanking 1250 is long, and clout enters stove;
The second fire: pull out to 400 all directions, blanking 890 length/parts, clout enters 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, round as a ball;
The 5th fire: spinning is to final dimension: H+265--φ 730
Forge postheat treatment:
In order to property heat treatment, to provide good tissue to guarantee, forge postheat treatment and adopt double normalizing to add the forging postheat treatment technique that expands hydrogen annealing, further reach structural constituent even, grain refining effect, and eliminate white point hidden danger.
Normalizing for the first time: 920 ± 15 ℃, be incubated >=4 hours, air cooling;
2, normalizing for the second time: 850-870 ℃, be incubated >=6 hours, air cooling;
3, expand hydrogen annealing: 640-660 ℃, be incubated >=40 hours;
Property heat treatment:
By the fully cooling material structure that makes that quenches, change fully, the complete through hardening of heart section, forging obtains 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. in Cooling Process, stir.
4. 20 minutes thermometrics after 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 structure grading figure and assessment methods.
Adopt positively effect of the present invention to be:
The Chemical Composition reasonable ratio, the material purity is good; Heart section forges real effective; The density of metal structure is good;
Specific targets are:
Hardness after modulation: HB293-341(Hs43-50);
Tensile strength: σ
b: 999MPa-1137Mpa;
Yield strength: 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 is answered≤68N/mm2, if forging only needs a tensile test bar or only need to check hardness, the Brinell hardness 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 by optimizing components; By electroslag remelting process, effectively raise the purity of molten steel; Research and development, improvement by Forging Technology make the forging tissue obtain homogenizing, and heart section fully forges; By 2 normalizing process forging postheat treatment material has been homogenized and refinement crystal grain; Optimization by 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.
The accompanying drawing explanation
The present invention is further described with enforcement below in conjunction with accompanying drawing:
Accompanying drawing 1 is process flow sheet of the present invention.
Embodiment
Embodiment mono-
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, crystallizer water temperature: 40 ℃ of crystallizer 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 in every 5 minutes, weight 90g.
Ingot annealing: annealed 26 hours for 682 ℃.
Steel ingot forges: minute five fire forge, and design parameter is as follows:
Heating before forging: 1242 ℃ of insulation 11h;
The first fire: steel ingot pressing tongs handle, round as a ball, pulling is to 600 all directions, and blanking 1250 is long, and clout enters stove;
The second fire: pull out to 400 all directions, blanking 890 length/parts, clout enters 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, round as a ball;
The 5th fire: spinning is to final dimension: H+265--φ 730
Forge postheat treatment:
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: by the fully cooling material structure that makes that quenches, change fully, the complete through hardening of heart section, forging obtains 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. in Cooling Process, stir.
4. 20 minutes thermometrics after water outlet, workpiece surface position temperature: 80 ℃.
Embodiment bis-
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, crystallizer water temperature: 40 ℃ of crystallizer 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 in every 5 minutes, weight 90g.
4, ingot annealing: annealed 26 hours for 685 ℃.
5, steel ingot forges: minute five fire forge, and design parameter is as follows:
Heating before forging: 1241 ℃ of insulation 16h;
The first fire: steel ingot pressing tongs handle, round as a ball, pulling is to 600 all directions, and blanking 1250 is long, and clout enters stove;
The second fire: pull out to 400 all directions, blanking 890 length/parts, clout enters 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, round as a ball;
The 5th fire: spinning is to final dimension: H+265--φ 730.
6, forge postheat treatment:
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: by the fully cooling material structure that makes that quenches, change fully, the complete through hardening of heart section, forging obtains 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. in Cooling Process, stir.
4. 20 minutes thermometrics after 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 structure grading figure and assessment methods.
Claims (2)
1. wheel disc forging, is characterized in that this forging further optimizes material composition content, controls C, the Mn constituent content upper limit, improves the Ni constituent content, reduces 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, by forge that postheat treatment is adopted double normalizing to process 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 :≤0.20%, all the other element of Fe.
2. wheel disc forge piece manufacturing process is characterized in that manufacturing technology steps is as follows:
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 ℃, and gas content H
2≤ 1.5ppm, O
2≤ 50ppm, N
2≤ 80ppm;
2) electrode base cast: adopt under argon shield and pour into a mould;
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 three-phase electric slag furnace remelting, packing ratio is controlled between 0.22-0.24;
C, crystallizer water temperature: crystallizer outlet water temperature is controlled between 30 ℃-60 ℃;
D, dry air total process protective: 4.3m3/min, dry air humidity 0.68g/m3;
E, reductor: aluminum shot added once in every 5 minutes, weight 80-100g;
4) ingot annealing: 680 ℃ ± 10 ℃ annealing 25-28 hour;
5) steel ingot forges: minute five fire forge, and design parameter is as follows:
Heating before forging: 1240 ± 10 ℃ of insulation 10-16h;
Forging range: 1240 ℃-800 ℃;
The first fire: steel ingot pressing tongs handle, round as a ball, pull out to 600 all directions, blanking 1250 length/parts, clout enters stove;
The second fire: pull out to 400 all directions, blanking 890 length/parts, clout enters 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, round as a ball;
The 5th fire: spinning is to final dimension: H=265--Ф 730;
6) forge postheat treatment: for good tissue is provided to property heat treatment, guarantee, forge postheat treatment and adopt double normalizing to add the forging postheat treatment technique that expands hydrogen annealing, further reach structural constituent even, grain refining effect, and eliminate white point hidden danger;
Normalizing for the first time: 920 ± 15 ℃, be incubated >=4 hours, air cooling;
Normalizing for the second time: 850-870 ℃, be incubated >=6 hours, air cooling;
Expand hydrogen annealing: 640-660 ℃, be incubated >=40 hours;
7) property heat treatment: by the fully cooling material structure that makes that quenches, change fully, the complete through hardening of heart section, forging obtains 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 Cooling Process;
D: 20 minutes thermometrics after 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 structure grading figure and assessment methods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104496290A CN102719761B (en) | 2011-12-29 | 2011-12-29 | Wheel disc forging and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104496290A CN102719761B (en) | 2011-12-29 | 2011-12-29 | Wheel disc forging and manufacturing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102719761A CN102719761A (en) | 2012-10-10 |
| CN102719761B true CN102719761B (en) | 2013-11-27 |
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