CN107164703A - A kind of production method of high ferro brake disc - Google Patents
A kind of production method of high ferro brake disc Download PDFInfo
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- CN107164703A CN107164703A CN201710369104.3A CN201710369104A CN107164703A CN 107164703 A CN107164703 A CN 107164703A CN 201710369104 A CN201710369104 A CN 201710369104A CN 107164703 A CN107164703 A CN 107164703A
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- ferro brake
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/12—Discs; Drums for disc brakes
- F16D65/125—Discs; Drums for disc brakes characterised by the material used for the disc body
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The present invention relates to a kind of production method of high ferro brake disc, including 1) smelting molten steel；The molten steel of casting high ferro brake disc is super-purity ferrite stainless steel, is refined through intermediate frequency furnace melting+LF VOD；2) high ferro brake disc is cast using full-automatic foundry production line；3) the high ferro brake disc castings after casting are heat-treated and machined again after being surface-treated through ball blast；4) product inspection；The super-purity ferrite stainless steel that the present invention is constituted using special composition, poured into a mould after being refined through intermediate frequency furnace melting+LF VOD, using full-automatic foundry production line, moulding is carried out with mound precoated sand and makes core, not only property indices meet the requirements the high ferro brake disc produced, and surface smoothness and dimensional accuracy can reach silica sol precision casting level；New approach is opened for the production of high ferro brake disc.
Description
Technical field
The present invention relates to brake disc production technical field, more particularly to a kind of production method of high ferro brake disc.
Background technology
High ferro brake disc requires higher to material and casting accuracy, generally makes high using super-purity ferrite stainless steel at present
Iron brake disc, but chromium content is 24% in the ZG00Cr24Mo1NiNbW of typical super-purity ferrite stainless steel such as this patent,
And chromium content is very high in high chrome and phosphorus content is very low, cause and oxide slag inclusion be also easy to produce in casting process；Again due to Gao Ge
Steel easily forms subcutaneous blowhole in high temperature with the oxygen solid solution in air, because poor fluidity is easily produced in foundry production
Raw food every；Oxidizable during its other high temperature, cast(ing) surface, which is also easy to produce inside oxide-film fold, oxide entrapment, easily forms oxidation folder
The defects such as debris slag inclusion, stomata, shrinkage porosite, cold shut, cause the difficulty of technological design to increase, thus increase Foundry Production difficulty.
High ferro brake disc is as used silica sand precoated sand Molding Casting, and its casting accuracy is often difficult to ensure that；In order to ensure casting
Manufacturing accuracy, some manufacturing enterprises use silica sol precision casting, the high ferro brake disc surface smoothness and dimensional accuracy produced
It is higher, but its production cost is higher, and cause severe environmental pollution.
The content of the invention
The invention provides a kind of production method of high ferro brake disc, the super-purity ferrite constituted using special composition is stainless
Steel, through intermediate frequency furnace melting+LF-VOD refine after pour into a mould, using full-automatic foundry production line, is carried out with mound precoated sand moulding with
Core is made, not only property indices meet the requirements the high ferro brake disc produced, and surface smoothness and dimensional accuracy can
Reach silica sol precision casting level；New approach is opened for the production of high ferro brake disc.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of production method of high ferro brake disc, comprises the following steps：
1) smelting molten steel；The molten steel of casting high ferro brake disc is super-purity ferrite stainless steel, through intermediate frequency furnace melting+LF-
VOD is refined；Detailed process is as follows：
The chemical composition of the super-purity ferrite stainless steel is by weight percentage：C≤0.02%；Si 0.4%~
1.0%；Mn0.4%~1.0%；P≤0.02%；S≤0.02%；Cr 22%~24%；Ni 1.5%~2.0%；Mo
2.5%~3.5%；Nb 0.2%~0.4%；V 0.5%~1.0%；W 1.0%~3.0%；Remaining is iron and inevitable
Impurity；
Intermediate frequency furnace stokehold carries out molten steel composition analysis, 1640 DEG C~1650 DEG C of tapping temperature using spectrometer；
LF refining process is used to carry out molten steel heat temperature raising and adjustment chemical composition, using 3 electrode insertions during heating
Submerged arc heating means in slag blanket, it is the 2%~8% of amount of metal to keep the quantity of slag；Argon is stirred, adduction gold adjustment chemical composition；
VOD refining process is used to the molten steel after the heating refining in LF refining furnace sending into VOD vacuum refining device vacuum
Carry out in the molten steel after double refining, double refining that O content is in below 10ppm, H content in below 0.8ppm in tank, S contents exist
Less than 0.01%；It is defined above that inclusion content of steel meets 2.5 grades of ASTM standard；
2) high ferro brake disc is cast using full-automatic foundry production line；Detailed process is as follows：
Moulding is carried out using 70~140 mesh mound precoated sands and core is made, and full-automatic foundry production line is by 12 station, 36 warm
Core box machine is constituted, and core, automatic drawing, automatic mould assembling, automatic casting, automatic shake out and sand processing function are made with automatic modeling；
Super-purity ferrite stainless steel molten steel comes out of the stove pouring temperature for 1570~1590 DEG C；
3) the high ferro brake disc castings after casting are heat-treated and machined again after being surface-treated through ball blast, heat treated
Cheng Wei：
950 DEG C~970 DEG C of normalized treatment；570 DEG C~590 DEG C of temper；
The examination and test of products is carried out after high ferro brake disc semi-finished product heat treatment after heat treatment, it is desirable to surface smoothness 1.6~3.2
Level；5~6 grades of dimensional accuracy；High ferro brake disc semi-finished product after the assay was approved finally give height through flaw detection, repair welding and machining
Iron brake disc finished product；
4) product inspection；High ferro brake disc end properties index is as follows：
Mechanical performance index：Tensile strength >=600MPa；Yield strength >=430MPa；Elongation percentage >=25%；Hardness >=
220HB；
Frictional behaviour：The coefficient of sliding friction≤0.2；
Metallographic structure：Iron plain sheet+a small amount of austenite+column carbide；
Examine above qualified high ferro brake disc finished product again through dynamic balance running it is qualified after, packaging and storage.
When adding raw material during the intermediate frequency furnace melting, Cr iron uses metal Cr and micro- carbon Cr, and the two presses 1：1 weight ratio adds
Plus.
Compared with prior art, the beneficial effects of the invention are as follows：
1) super-purity ferrite stainless steel is constituted using special composition, poured into a mould after being refined through intermediate frequency furnace melting+LF-VOD, refining
O content is in below 10ppm, H content in below 0.8ppm in molten steel afterwards, and S contents are below 0.01%；Inclusion content of steel
Meet 2.5 grades of ASTM standard defined above；
2) use full-automatic foundry production line, with automatic modeling make core, automatic drawing, automatic mould assembling, automatic casting, from
Dynamic shake out and sand processing function；Meet the industrial revolution 4.0 of China 2025 realize industrial automation, digitlization and it is intelligentized always
Ask；
3) using mound precoated sand as foundry sand, it is efficient environmental-protecting type casting sand, and intensity is high, fire resistance
It is good, exempt from swabbing after moulding, and the surface smoothness and inherent quality of casting can be significantly improved；With silica sol precision casting phase
Than production cost more than 20% can be reduced, and the production cycle shortens more than 5 days, and the rate of recovery of sand is up to more than 98%；
Brief description of the drawings
Fig. 1 is high ferro brake disc castings integrated cast structure schematic diagram one of the present invention.
Fig. 2 is high ferro brake disc castings integrated cast structure schematic diagram two of the present invention.
Fig. 3 is high ferro brake disc production technological process of the present invention.
Embodiment
The embodiment to the present invention is described further below in conjunction with the accompanying drawings：
A kind of production method of high ferro brake disc, comprises the following steps：
1) smelting molten steel；The molten steel of casting high ferro brake disc is super-purity ferrite stainless steel, through intermediate frequency furnace melting+LF-
VOD is refined；Detailed process is as follows：
The chemical composition of the super-purity ferrite stainless steel is by weight percentage：C≤0.02%；Si 0.4%~
1.0%；Mn0.4%~1.0%；P≤0.02%；S≤0.02%；Cr 22%~24%；Ni 1.5%~2.0%；Mo
2.5%~3.5%；Nb 0.2%~0.4%；V 0.5%~1.0%；W 1.0%~3.0%；Remaining is iron and inevitable
Impurity；
Intermediate frequency furnace stokehold carries out molten steel composition analysis, 1640 DEG C~1650 DEG C of tapping temperature using spectrometer；
LF refining process is used to carry out molten steel heat temperature raising and adjustment chemical composition, using 3 electrode insertions during heating
Submerged arc heating means in slag blanket, it is the 2%~8% of amount of metal to keep the quantity of slag；Argon is stirred, adduction gold adjustment chemical composition；
VOD refining process is used to the molten steel after the heating refining in LF refining furnace sending into VOD vacuum refining device vacuum
Carry out in the molten steel after double refining, double refining that O content is in below 10ppm, H content in below 0.8ppm in tank, S contents exist
Less than 0.01%；It is defined above that inclusion content of steel meets 2.5 grades of ASTM standard；
2) high ferro brake disc is cast using full-automatic foundry production line；Detailed process is as follows：
Moulding is carried out using 70~140 mesh mound precoated sands and core is made, and full-automatic foundry production line is by 12 station, 36 warm
Core box machine is constituted, and core, automatic drawing, automatic mould assembling, automatic casting, automatic shake out and sand processing function are made with automatic modeling；
Super-purity ferrite stainless steel molten steel comes out of the stove pouring temperature for 1570~1590 DEG C；
3) the high ferro brake disc castings after casting are heat-treated and machined again after being surface-treated through ball blast, heat treated
Cheng Wei：
950 DEG C~970 DEG C of normalized treatment；570 DEG C~590 DEG C of temper；
The examination and test of products is carried out after high ferro brake disc semi-finished product heat treatment after heat treatment, it is desirable to surface smoothness 1.6~3.2
Level；5~6 grades of dimensional accuracy；High ferro brake disc semi-finished product after the assay was approved finally give height through flaw detection, repair welding and machining
Iron brake disc finished product；
4) product inspection；High ferro brake disc end properties index is as follows：
Mechanical performance index：Tensile strength >=600MPa；Yield strength >=430MPa；Elongation percentage >=25%；Hardness >=
220HB；
Frictional behaviour：The coefficient of sliding friction≤0.2；
Metallographic structure：Iron plain sheet+a small amount of austenite+column carbide；
Examine above qualified high ferro brake disc finished product again through dynamic balance running it is qualified after, packaging and storage.
When adding raw material during the intermediate frequency furnace melting, Cr iron uses metal Cr and micro- carbon Cr, and the two presses 1：1 weight ratio adds
Plus.
Super-purity ferrite stainless steel is the new kinds of steel developed in recent years, is the new production for being replaced in nickel chromium stainless steel
Product, due to the development and application of super-purity ferrite stainless steel, can not only save substantial amounts of nickel, advantageously reduce production cost, and
Super-purity ferrite stainless steel it be a kind of anti-oxidant, sulfuration resistant, resistant to sea water, resisting chloride ion penetration, the high temperature resistance concentrated sulfuric acid and various acid
The ideal material of class, it, which can be used not only for casting, can also forge, roll various workpiece and steel plate；Therefore ultra pure iron is plain
Body stainless steel is the ideal material for manufacturing high ferro brake disc.In its chemical composition due to add Nb and Ti elements, can solid solution C and
N, changes the shape of carbon, solves the problems, such as rolling, casting and weld crack, also substantially increases material intergranular corrosion resistance performance,
Substantially increase Product processing cutting ability.
LF-VOD refinings are, by by middle frequency furnace fusing molten steel feeding LF-VOD refining furnaces, secondary fine to be carried out using duplex practice
A kind of method of ladle refining of refining.The liquid steel refining process of LF-VOD refining furnaces is to improve molten steel degree of purity, improve in casting
In one of most important method of quality, strong with affinability, deoxidation, dehydrogenation, denitrogenation, desulfurization, purification molten steel effect are good
Feature, suitable for production super-low sulfur, Ultra Low-oxygen steel grade.
LF-VOD refining process is broadly divided into two processes：First process is LF stove liquid steel refining processes；LF refining
Great advantage is that heat temperature raising can be carried out to molten steel and chemical analysis is controlled to adjust, using 3 electrode insertion slag blankets during heating
In i.e. submerged arc heating, the radiation of this method is small, there is protective effect to furnace lining, and the efficiency of heating surface is high.LF refining furnace is in itself
Do not have vacuum equipment typically.Refining when, i.e., be when being refined under the atmospheric pressure not vacuumized lean on reproducibility slag and
The oxide such as FeO, MnO, C effect generation CO gases in graphite electrode and slag, increase the reducing atmosphere of furnace gas during heating.Argon gas
Stirring is the most significant steps of LF refining, and argon gas stirring may advantageously facilitate the chemical reaction between slag, can accelerate slag it
Between material transmission, be conducive to deoxidation, the progress of desulphurization reaction of molten steel.Argon stirring can also remove non-metallic inclusion,
The complicated chemical composition of accurate adjustment；In addition Argon, which is stirred, can also accelerate the reduction of oxide in slag, and recyclable chromium etc. is valuable
The alloying element of value.LF stoves are refined by white slag, and white slag has very strong reproducibility, blowing argon gas stirring power in LF stoves
Reducing atmosphere good in LF stoves is improved, by good slag making function, it is the 2~8% of amount of metal to keep the quantity of slag.Can be effective
Reduction steel in oxygen, sulphur and inclusion content.
Second process is VOD vacuum refining molten steel processes：Molten steel after LF refining furnace heats up refining enters VOD vacuum
Double refining is carried out in refining equipment vacuum tank, to obtain pure molten steel and relatively low H, O, N gas content and low-sulfur, low be mingled with
The molten steel of thing.VOD vacuum refinings are stirred mainly by top blow oxygen lance, while being blown into argon gas through ladle bottom air brick and carrying out high intensity
Mix, hydrogen, nitrogen constantly spread to Argon Bubble in molten steel, certain partial pressure is formed in nitrogen bubble, hydrogen and nitrogen are in Argon Bubble
Partial pressure can with bubble floating when heated volumetric expansion, thus the partial pressure of hydrogen, nitrogen remains to keep relatively low level, therefore continues to inhale
Hydrogen and nitrogen are received, finally the surface of molten steel is spilt into Argon Bubble and is removed.
O content can be reduced to below 10PPm, H content drop by super-purity ferrite stainless steel molten steel after being refined through above procedure
It is low to below 0.8PPm；Because deoxidation is good in refining process, Al is can absorb2O3、SiO2Deng impurity, there is certain change
Property effect, casting inclusion content meets 2.5 grades of requirements above of ASTM standard.
The grain shape of nice foundry sand is approximate circle, and with higher intensity and high refractoriness, it is applied to Foundry Production
The severe contamination of hot investment casting production is solved the problems, such as, the production environment of casting is improved, solves and perplex foundry worker always
Anthraco-silicosis problem, also greatly shorten the production cycle, reduce percent defective, it is often more important that reduce resin and curing agent
Addition, add gas permeability with respect to hot investment casting, reduce casting defect produce, also greatly reduce and be manufactured into
This.Nice foundry sand is a kind of neutral material, is suitable for producing the casting of various materials, is also suitable for production high-alloy steel, stainless steel
With nickel base superalloy stainless steel and the super-purity ferrite stainless steel brake disc castings of precision.The application of nice foundry sand is also country
The primary study and promotion project of 13.5 plans, are national environmental protection key projects.
Nice foundry sand is that a kind of spherical casting being made by raw material of aluminium vanadine by calcination, the molten granulation of electricity, sub-sieve is used
Sand, it is the substitute of quartz sand, is also efficient environmental-protecting type casting sand, widely should have been obtained since being come out from nice foundry sand
With being mainly used in the facing sand of sand casting, static pressure line sand, although it is used for evaporative pattern and the casting of V methods is also achieved
Effect, if the surface smoothness and inherent quality of casting are significantly improved, but there is presently no the document announcement of more applications.
The present invention replaces hot investment casting to produce high ferro brake disc using mound precoated sand, not only greatly shortens the production cycle, also greatly
Big reduces percent defective, reduces production cost, has filled up the blank that domestic mound precoated sand instead of Ludox casting, has been
A kind of innovation of casting field.
Mound precoated sand produces simple production process during various casting, mainly according to the requirement of casting and the size of casting
To select the granularity of process and nice foundry sand, using hot-working curing molding, exempt from swabbing, direct mould assembling cast.
Mound precoated sand produces casting compared with quartz sand, and its intensity is high, and refractoriness is up to 1900 DEG C, and (quartz sand only has
1700 DEG C), therefore molding sand is unlikely to be burnt and crushes when high temperature is poured into a mould, the ashes produced in sand is reclaimed seldom, can make sand
Yield reaches more than 98%；Again because nice foundry sand is rounded, thus substantial amounts of binding agent and curing agent are saved, significantly
The gas permeability for adding sand mold；Because nice foundry sand has above advantage, saving compound, sand recovery with reference to it, reducing useless
Advantage in terms of product rate, simple production process, COMPREHENSIVE CALCULATING can about reduce production cost 20%.
Following examples are implemented lower premised on technical solution of the present invention, give detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
It is conventional method not mentionlet alone bright.
【Embodiment】
In the present embodiment, the structure of high ferro brake disc castings 1 produced as shown in Figure 1 and Figure 2, high ferro brake disc castings weight
About 120kg is measured, appearance and size is(diameter) x150 (thickness) mm；Cast sandbox size 850x850x (200/400) mm, on
The high 400mm of case, the high 200mm of nowel.Label 2 is rising head in figure, and 3 be running channel, and 4 be the chill that nowel is set；Using automation casting
Make production line, 10 casees of moulding speed/20,000 tons of hour annual production.
In the present embodiment super-purity ferrite stainless steel used in high ferro brake disc main chemical compositions composition (remaining be Fe and
Inevitable impurity) it is as follows：
The mechanics properties testing result of the high ferro brake disc produced by the method for the invention is as shown in the table：
Cast and referred to hot investment casting and the produced brake disc castings items of phenol resin sand casting using mound precoated sand
Mark is compared as follows shown in table：
| Casting method | Mound precoated sand is cast | Hot investment casting | Phenol resin sand is cast |
| Surface smoothness | 1.6-0.8 | 1.6-0,8 | 24 |
| Dimensional accuracy | 5 grades | 5 grades | 12 grades |
| Per case placement amount | 1 | 1 | 1 |
| Placer iron ratio | 3:1 | 3:1 | 4:1 |
| The sand rate of recovery | 98% | It is not recyclable | 85% |
| Production cycle/day | 2 | 10 | 9 |
| Yield rate | 100% | 96% | 98% |
| Repair rate | It is low | It is low | It is high |
| Allowance | 3 | 3 | 7 |
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (2)
1. a kind of production method of high ferro brake disc, it is characterised in that comprise the following steps：
1) smelting molten steel；The molten steel of casting high ferro brake disc is super-purity ferrite stainless steel, through intermediate frequency furnace melting+LF-VOD essences
Refining；Detailed process is as follows：
The chemical composition of the super-purity ferrite stainless steel is by weight percentage：C≤0.02%；Si 0.4%~1.0%；Mn
0.4%~1.0%；P≤0.02%；S≤0.02%；Cr 22%~24%；Ni 1.5%~2.0%；Mo 2.5%~
3.5%；Nb 0.2%~0.4%；V 0.5%~1.0%；W 1.0%~3.0%；Remaining is iron and inevitable impurity；
Intermediate frequency furnace stokehold carries out molten steel composition analysis, 1640 DEG C~1650 DEG C of tapping temperature using spectrometer；
LF refining process is used to carry out molten steel heat temperature raising and adjustment chemical composition, using 3 electrode insertion slag blankets during heating
In submerged arc heating means, keep the quantity of slag be amount of metal 2%~8%；Argon is stirred, adduction gold adjustment chemical composition；
VOD refining process is used to send into the molten steel after the heating refining in LF refining furnace in VOD vacuum refining device vacuum tanks
O content is in below 10ppm, H content in below 0.8ppm in molten steel after progress double refining, double refining, and S contents exist
Less than 0.01%；It is defined above that inclusion content of steel meets 2.5 grades of ASTM standard；
2) high ferro brake disc is cast using full-automatic foundry production line；Detailed process is as follows：
Moulding is carried out using 70~140 mesh mound precoated sands and core is made, and full-automatic foundry production line is by 12 station, 36 hot boxs
Machine is constituted, and core, automatic drawing, automatic mould assembling, automatic casting, automatic shake out and sand processing function are made with automatic modeling；It is ultrapure
Ferritic stainless steel molten steel comes out of the stove pouring temperature for 1570~1590 DEG C；
3) the high ferro brake disc castings after casting are heat-treated and machined again after being surface-treated through ball blast, heat treatment process
For：
950 DEG C~970 DEG C of normalized treatment；570 DEG C~590 DEG C of temper；
The examination and test of products is carried out after high ferro brake disc semi-finished product heat treatment after heat treatment, it is desirable to 1.6~3.2 grades of surface smoothness；
5~6 grades of dimensional accuracy；High ferro brake disc semi-finished product after the assay was approved finally give high ferro and stopped through flaw detection, repair welding and machining
Hull finished product；
4) product inspection；High ferro brake disc end properties index is as follows：
Mechanical performance index：Tensile strength >=600MPa；Yield strength >=430MPa；Elongation percentage >=25%；Hardness >=220HB；
Frictional behaviour：The coefficient of sliding friction≤0.2；
Metallographic structure：Iron plain sheet+a small amount of austenite+column carbide；
Examine above qualified high ferro brake disc finished product again through dynamic balance running it is qualified after, packaging and storage.
2. the production method of a kind of high ferro brake disc according to claim 1, it is characterised in that during the intermediate frequency furnace melting
When adding raw material, Cr iron uses metal Cr and micro- carbon Cr, and the two presses 1：1 weight is than addition.
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| CN108193130A (en) * | 2017-12-28 | 2018-06-22 | 辽宁福鞍重工股份有限公司 | A kind of method for centrifuging electroslag smelting casting production high ferro brake disc |
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| CN113798446A (en) * | 2021-09-18 | 2021-12-17 | 洛阳中重铸锻有限责任公司 | Water explosion-free preparation method for super duplex stainless steel valve body casting for circulating water pump |
| CN114182061A (en) * | 2021-10-22 | 2022-03-15 | 南京钢铁股份有限公司 | Smelting method of steel for high-speed rail brake disc |
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