CN103225037B - High-carbon gray cast iron automobile brake disk and production method thereof - Google Patents
High-carbon gray cast iron automobile brake disk and production method thereof Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 71
- 229910001060 Gray iron Inorganic materials 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 77
- 229910052802 copper Inorganic materials 0.000 claims abstract description 34
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 32
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 239000000126 substance Substances 0.000 claims abstract description 27
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 26
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 42
- 239000010949 copper Substances 0.000 claims description 40
- 239000011572 manganese Substances 0.000 claims description 32
- 229910052742 iron Inorganic materials 0.000 claims description 28
- 238000005275 alloying Methods 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 244000309464 bull Species 0.000 claims description 15
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 12
- 230000007547 defect Effects 0.000 claims description 11
- 239000002699 waste material Substances 0.000 claims description 11
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 10
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 10
- 108010038629 Molybdoferredoxin Proteins 0.000 claims description 10
- 229910000805 Pig iron Inorganic materials 0.000 claims description 10
- HBELESVMOSDEOV-UHFFFAOYSA-N [Fe].[Mo] Chemical compound [Fe].[Mo] HBELESVMOSDEOV-UHFFFAOYSA-N 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 claims description 10
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 239000002667 nucleating agent Substances 0.000 claims description 10
- 238000010792 warming Methods 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 8
- 239000002054 inoculum Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 7
- 239000006249 magnetic particle Substances 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 6
- 239000007858 starting material Substances 0.000 claims description 6
- 238000009864 tensile test Methods 0.000 claims description 6
- 208000037656 Respiratory Sounds Diseases 0.000 claims description 5
- 206010039509 Scab Diseases 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 5
- 238000005422 blasting Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000001228 spectrum Methods 0.000 claims description 5
- 238000007669 thermal treatment Methods 0.000 claims description 5
- 230000001052 transient effect Effects 0.000 claims description 5
- WUPRCGRRQUZFAB-DEGKJRJSSA-N corrin Chemical compound N1C2CC\C1=C\C(CC/1)=N\C\1=C/C(CC\1)=N/C/1=C\C1=NC2CC1 WUPRCGRRQUZFAB-DEGKJRJSSA-N 0.000 claims description 2
- 229910000617 Mangalloy Inorganic materials 0.000 claims 2
- 230000000979 retarding effect Effects 0.000 abstract description 30
- 229910052804 chromium Inorganic materials 0.000 abstract description 23
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 23
- 229910052748 manganese Inorganic materials 0.000 abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 20
- 230000003245 working effect Effects 0.000 abstract description 4
- 239000011651 chromium Substances 0.000 description 27
- 229910002804 graphite Inorganic materials 0.000 description 23
- 239000010439 graphite Substances 0.000 description 23
- 229910001018 Cast iron Inorganic materials 0.000 description 22
- 230000000694 effects Effects 0.000 description 11
- 229910001562 pearlite Inorganic materials 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 7
- 239000011574 phosphorus Substances 0.000 description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 6
- 230000005496 eutectics Effects 0.000 description 6
- 238000011081 inoculation Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000011733 molybdenum Substances 0.000 description 6
- 239000010451 perlite Substances 0.000 description 6
- 235000019362 perlite Nutrition 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000005864 Sulphur Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 239000002075 main ingredient Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910004072 SiFe Inorganic materials 0.000 description 2
- NCJRLCWABWKAGX-UHFFFAOYSA-N [Si].[Ca].[Ba] Chemical compound [Si].[Ca].[Ba] NCJRLCWABWKAGX-UHFFFAOYSA-N 0.000 description 2
- 230000002929 anti-fatigue Effects 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- VAKIVKMUBMZANL-UHFFFAOYSA-N iron phosphide Chemical compound P.[Fe].[Fe].[Fe] VAKIVKMUBMZANL-UHFFFAOYSA-N 0.000 description 2
- 229940040145 liniment Drugs 0.000 description 2
- 239000000865 liniment Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 241000276425 Xiphophorus maculatus Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention relates to a kind of High-carbon gray cast iron automobile brake disk and production method thereof, described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.7% ~ 3.8%, Mn:0.5% ~ 0.8%, Cu:0.3% ~ 0.5%, Cr:0.1% ~ 0.2%, Mo:0.2% ~ 0.4%, Si:1.6% ~ 2.0%, N:0.1% ~ 0.2%, P:0.01% ~ 0.12%, S:0.05% ~ 0.12%, surplus is Fe.Retarding disc of the present invention has the outstanding features such as braking temperature rise is little, wear-resistant, thermal fatigue resistance is effective, the performance of brake system of car is obviously improved, work-ing life significantly improves, and simultaneously also effectively eliminate Yin Gaowen brake failure and the potential safety hazard brought, economic worth is high.
Description
Technical field
The present invention relates to auto parts machinery field, be specifically related to a kind of High-carbon gray cast iron automobile brake disk and production method thereof.
Background technology
Retarding disc is the vital part of automotive brake, plays vital effect to the safety traffic of automobile.The inefficacy of car brake disk has two kinds, and a kind of is wear out failure progressively, and a kind of is unexpected fracture failure.And the situation of fracture failure is actually rare suddenly, most retarding disc operationally not only subjects normal force and the tangential force of brake pad, and subjects thermal load.Generally, the reason that retarding disc lost efficacy is due to the frictional wear caused of repeatedly braking in life-time service process, finally causes retarding disc crack and even ftracture.At present, domestic brake system of car, retarding disc many employings gray cast iron material, namely conventional graphitic cast iron composition (what have adds micro-alloying), because carbon content is low, in tissue, Graphite Precipitation amount is on the low side, graphite microstructure disperses, matrix does not reach alloying index request yet, and heat conductivility and wear resisting property are all not good enough, there is the shortcomings such as easy to wear and braking ability is unstable in using, cause retarding disc asynchronous with integeral vehicle life, repeatedly retarding disc be need change in using, certain potential safety hazard and economical load brought to user
Such as: in currently available products, model is HT0483 graphitic cast iron retarding disc main ingredient is Fe, as follows to main ingredient (by weight percentage), matrix and mechanics property analysis contained by all the other:
| Heat (batch) number bag | C | Si | Mn | P | S | Tensile strength/MPa | Perlite | Hardness/HB |
| 2X12I15-1 | 3.37 | 2.2 | 0.74 | 0.091 | 0.064 | 185 | 85% | 213 |
| 2X12I15-5 | 3.39 | 2.39 | 0.76 | 0.092 | 0.05 | 189 | 86% | 214 |
| 2X12I15-A | 3.37 | 2.37 | 0.72 | 0.086 | 0.047 | 187 | 85% | 213 |
| 2X12I17-4 | 3.35 | 2.14 | 0.92 | 0.083 | 0.047 | 183 | 87% | 214 |
Described model is that HT0483 retarding disc carbon content is low, the amount of precipitation of graphite is less, graphite microstructure disperses, silicone content is high, and the heat conductivility that graphite structure is intrinsic and wear resisting property can not give full play to, through test prove this retarding disc heat conductivility and wear resisting property bad, easy to wear, work-ing life is low, braking quality is unstable, during use, there is very large potential safety hazard.
Summary of the invention
Object of the present invention is just to provide a kind of new High-carbon gray cast iron automobile brake disk and production method thereof, and to overcome, existing retarding disc on market is not wear-resisting, the easy shortcoming such as aging, fragile, unstable properties.
Technical scheme: a kind of High-carbon gray cast iron automobile brake disk, this High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.7% ~ 3.8%, Mn:0.5% ~ 0.8%, Cu:0.3% ~ 0.5%, Cr:0.1% ~ 0.2%, Mo:0.2% ~ 0.4%, Si:1.6% ~ 2.0%, N:0.1% ~ 0.2%, P:0.01% ~ 0.12%, S:0.05% ~ 0.12%, surplus is Fe.
Optimal way as technical scheme: described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.71% ~ 3.79%, Mn:0.53% ~ 0.77%, Cu:0.33% ~ 0.47%, Cr:0.11% ~ 0.18%, Mo:0.25% ~ 0.37%, Si:1.62% ~ 1.95%, N:0.11% ~ 0.18%, P:0.02% ~ 0.11%, S:0.06% ~ 0.11%, surplus is Fe.
Preferred again as technical scheme: described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.73% ~ 3.77%, Mn:0.58% ~ 0.73%, Cu:0.37% ~ 0.45%, Cr:0.13% ~ 0.19%, Mo:0.28% ~ 0.35%, Si:1.65% ~ 1.80%, N:0.13% ~ 0.17%, P:0.03% ~ 0.09%, S:0.07% ~ 0.10%, surplus is Fe.
Preferred again as technical scheme: described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.74% ~ 3.78%, Mn:0.62% ~ 0.65%, Cu:0.42% ~ 0.49%, Cr:0.12% ~ 0.15%, Mo:0.32% ~ 0.34%, Si:1.63% ~ 1.69%, N:0.14% ~ 0.15%, P:0.05% ~ 0.07%, S:0.08% ~ 0.09%, surplus is Fe.
Preferred again as technical scheme: described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.75%, Mn:0.56%, Cu:0.39%, Cr:0.17%, Mo:0.29%, Si:1.67%, N:0.16%, P:0.04%, S:0.05%, surplus is Fe.
This patent due to carbon content high, Graphite Precipitation quantity is many and long, also increases, must add alloying element along with ferritic amount, suppresses the length of graphite, increases content of pearlite in alloy; And ensureing that content of pearlite in alloy is 90% ~ 95%, ferrite exists: 5% ~ 10%, and ensure that Brinell hardness is at L245 ± 25HB, tensile strength is within the scope of 200 ~ 240MPa; In graphitic cast iron, addible alloying element is a lot, from object that is stable and refine pearlite, has copper, nickel, chromium, molybdenum, vanadium, titanium, nitrogen, antimony, niobium, tin etc.But alloying element add form and the quantity that membership affects graphite, the machinability of infringement retarding disc, the block hard phase that some alloying element is formed comes off when rubbing, can unstable wear.And the alloying element price such as Cu, Mo, Cr are more expensive, Mo and Cr also increases the shrinkage tendency solidified in cooling, so can only add by trace, this patent considers cost factor and the control to addition, select copper, chromium, molybdenum, nitrogen four kinds of alloying elements, and according to retarding disc needs, suitably control add-on.As follows to the concrete analysis of this patent each component:
Carbon (C), in this patent graphitic cast iron, carbon mainly exists with the form of graphite, graphite does not almost have intensity, be considered as cavity in the base, impart the damping capacity that graphitic cast iron is stronger, its thermal conductivity is large simultaneously, heat storage capacity is strong, can spread out of the heat that drag friction produces very soon, the temperature making retarding disc keep lower, stablizes its performance; In addition, the Patterns for Close-Packed Hexagonal Crystal structure of graphite, makes it have effect of unlubricated friction liniment, reduces frictional coefficient, slows down the frictional wear of retarding disc.Common grey iron retarding disc, carbon content is generally no more than 3.4%, in order to play the advantage of graphite in braking in graphitic cast iron, carbon content is brought up to and is accounted for 3.7% ~ 3.8% of total component by this patent, to improve recovery electric heating system, thermal conductivity, the performance such as wear resistance and damping capacity of retarding disc.
Silicon (Si), the effect of described silicon in cast iron expands eutectic transformation temperature range, reduces eutectic transformation temperature, reduces crystallization excessively cold, promotes the greying of carbon, prevent cementite phase, therefore silicon is indispensable in graphitic cast iron.But silicon also promotes ferritic formation in matrix strongly, reduce intensity and the hardness of cast iron, affect the wear resisting property of material.So for ensureing the intensity of retarding disc, hardness and wear resisting property, silicone content controls accounting for 1.6% ~ 2.0% of total component by this patent.
Manganese (Mn), described manganese is anti-graphited element in cast iron, but in certain content range, manganese energy refinement flake graphite, has effect that is stable and refine pearlite, strengthening matrix simultaneously, improve the mechanical property of graphitic cast iron, also favourable to wear resisting property, but Fe content is too high, can increase chilling tendency.So manganese is as alloying element, and the content of manganese controls accounting for 0.5% ~ 0.8% of total component by this patent.
Phosphorus (P), described phosphorus has the graphited effect of certain promotion in cast iron, but its effect is very micro-, generally do not use as Addition ofelements, but phosphorus is due to the segregation behavior in process of setting, easily form hard and crisp iron phosphide eutectic tissue at eutectic cell crystal boundary, improve the hardness of matrix, be conducive to wear resistance, pretend as braking wear part, allowed a certain amount of phosphorus to exist, if phosphorus amount is higher, the iron phosphide eutectic of separating out is many, obviously can reduce tensile property.This patent phosphorus adds with starting material, total the content of phosphorus is account for component 0.01% ~ 0.12%.
Sulphur (S), described sulphur can form segregation phase sulphur eutectic in graphitic cast iron, affect the performance of graphitic cast iron, must be limited, but sulphur is in the scope of 0.05% ~ 0.12%, be conducive to the forming core of graphite in process of setting, therefore the content of sulphur is controlled in 0.05% ~ 0.12% scope accounting for total component by this patent.
Copper (Cu), the graphitizability of copper is about 1/6 of silicon, therefore the chilling tendency of cast iron can be reduced, copper also can reduce the critical temperature of austenitic transformation simultaneously, therefore copper can promote pearlitic formation, increase pearlitic content, simultaneously energy refine pearlite and strengthening perlite and ferrite wherein, thus increase hardness and the intensity of cast iron.So this patent suitably adds a certain amount of alloy element copper, and the content of copper is controlled in 0.3% ~ 0.5% scope accounting for total component.
Chromium (Cr), during through experimental results demonstrate that massfraction is 0.005% ~ 0.02%, chromium energy refinement graphite, stop ferrite to be formed, increasing pearlite fraction, is a kind of widely used alloying element, so the content of this patent chromium is account for total component 0.1% ~ 0.2%.
Molybdenum (Mo), molybdenum is typical compound formation element, is very strong perlite stable element, its energy refinement graphite, when massfraction is 0.2% ~ 0.4%, molybdenum energy refine pearlite, the ferrite in perlite can be strengthened simultaneously, thus effectively can improve intensity and the hardness of cast iron.The content of this patent molybdenum is account for total component 0.2% ~ 0.4%.
Nitrogen (N), nitrogen has the effect of comparatively strong stabilizing pearlite in graphitic cast iron, carries high-tensile successful, is also improved the effect of wear resistance.N generally adds with the form of CrN, MnN, and but, N easily causes gas hole defect to occur, and is unsuitable for thin-section casting, so the content of this patent nitrogen is account for total component 0.1% ~ 0.2%.
A production method for High-carbon gray cast iron automobile brake disk, described production method comprises the following steps:
Step 1: prepare starting material: the magnesium iron pig iron, low-carbon waste steel, ferrochrome, molybdenum-iron, ferromanganese, electrolytic copper, MnN or CrN;
Step 2: dissolve: the magnesium iron pig iron, low-carbon waste steel are added in middle frequency furnace, described middle frequency furnace rated output is 1800 ~ 2200KW, melting rate 3.2 ~ 3.4t/h, smelting state is 550k ~ 565w.h/t, melting 1 ~ 3 hour, treats that furnace charge melts completely, when temperature reaches 1450 DEG C ~ 1550 DEG C, to its sampling, by its chemical composition of spectrum analyzer rapid detection; According to detected result, ensure that C accounts for 3.7% ~ 3.8% of total component by weight percentage, adjust and add ferrochrome adjustment alloying elements cr, making Cr remain on 0.1% ~ 0.2% of total component; Adjust and add molybdenum-iron adjustment Alloy Elements Mo, making Mo remain on 0.2% ~ 0.4% of total component; Adjust and add MnN or CrN and adjust alloying element N, make N remain on 0.1% ~ 0.2% of total component; Adjust and add ferromanganese adjustment alloying element Mn, making Mn remain on 0.5% ~ 0.8% of total component; Continue to be warming up to 1510 DEG C ~ 1530 DEG C, come out of the stove, iron liquid is put into bull ladle, adjusts in bull ladle and add electrolytic copper, make the content of Cu be account for total component 0.3% ~ 0.5%; Adjustment elements Si, P, S, its amount accounting for total component is by weight percentage met: Si:1.6% ~ 2.0%, P:0.01% ~ 0.12%, S:0.05% ~ 0.12%, surplus is Fe;
Step 3: cast: in bull ladle, iron liquid liquid level is ladle-to-ladle lower than starting during bag mouth 28 ~ 32mm, and when ladle-to-ladle, iron liquid is poured in pouring ladle, in casting process, the strict duration of pouring controlling whole iron clad water, completes cast at 6 ~ 12min, within after cast terminates 1 ~ 3 hour, unpacks, take off part, foundry goods horizontal is cooled, free shrink, cleaning dead head and burr, cylinder impeller blasting cast(ing) surface oxide skin and local scab, polishing dead head undesirable root;
Step 4: thermal treatment: foundry goods is heat-treated by heat treatment furnace, heat treatment process parameter is: normal temperature enters stove, is warming up to 520 ~ 550 DEG C with 60 ~ 100 DEG C/h temperature rise rate, then keeps constant temperature 3 ~ 4h, cool to 250 ~ 300 DEG C with the furnace to come out of the stove, and carry out air cooling;
Step 5: adopt traditional mechanical workout pattern, by drawing matching requirements size, it is processed, then transient equilibrium detection is carried out, as required duplicate removal process is carried out to converted products, carry out magnetic-particle inspection afterwards again, detect the defects such as casting crack, have the foundry goods of crackle directly to discard, the formation finished product of flawless defect.
As the optimal way of technical scheme, total also pour with stream the composite inoculant accounting for raw material component 0.3% ~ 0.5% when coming out of the stove in described step 2, in parcel, when pouring into a mould in described step 3, also add the fine granularity nucleating agent accounting for the total component 0.1% ~ 0.15% of raw material.
As the optimal way of technical scheme, also pour into a mould test wedge in described step 3 when pouring into a mould and starting, in cast, in middle and latter stage, pour into a mould chemical composition sample respectively, every iron clad water pours into a mould one group of tensile test bar blank.
As the optimal way of technical scheme, according to detected result in described step 2, if C accounts for the amount of total component by weight percentage lower than 3.7%, add the carburelant that high violent steel scrap or carbon content are greater than 98.5%, to adjust and meet that C content accounts for total component 3.7 ~ 3.8%.
As technical scheme further preferably, according to detected result in described step 2, if C accounts for the amount of total component by weight percentage lower than 3.7%, add the carburelant that high violent steel scrap or carbon content are greater than 98.5%, to adjust and meet that C content accounts for total component 3.73% ~ 3.77%.
Preferred again as technical scheme, adjusts elements Si in described step 2, makes Si content be account for total component by weight percentage 1.64% ~ 1.67%.
Beneficial effect of the present invention: the present invention adopts the graphitic cast iron of high-carbon content, carbon content is brought up to 3.7% ~ 3.8% by the basis being no more than 3.4% in common grey iron brake flange carbon content, carbon mainly exists with the form of graphite in graphitic cast iron, graphite does not almost have intensity, imparts the damping capacity that graphitic cast iron is stronger, and its thermal conductivity is large simultaneously, heat storage capacity is strong, can spread out of the heat that drag friction produces very soon, the temperature making retarding disc keep lower, stablizes its performance; In addition, the Patterns for Close-Packed Hexagonal Crystal structure of graphite, makes it have effect of unlubricated friction liniment, reduces frictional coefficient, slows down the frictional wear of retarding disc.But isolate effect due to graphite itself, for ensureing its hardness and wear resistance, this patent is by reasonable selection alloy element, ensure that the content of matrix Medium pearlite, enhance perlite, optimize graphite length, under the condition of high-carbon content (graphite volume fraction is higher), obtain higher mechanical property and cutting ability, the lifting by a relatively large margin that simultaneously made the thermal conductivity of material, wear resistance and thermal fatigue resistance have.Adopt the automobile brake disc that this patent method manufactures, there is the outstanding features such as braking temperature rise is little, wear-resistant, thermal fatigue resistance is effective, the performance of brake system of car is obviously improved, work-ing life significantly improves, simultaneously also effectively eliminate Yin Gaowen brake failure and the potential safety hazard brought, economic worth is high.
Embodiment
Embodiment 1: a kind of High-carbon gray cast iron automobile brake disk, described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.7% ~ 3.71%, Mn:0.5% ~ 0.51%, Cu:0.3% ~ 0.31%, Cr:0.1% ~ 0.11%, Mo:0.2% ~ 0.22%, Si:1.6% ~ 1.62%, N:0.1% ~ 0.12%, P:0.01% ~ 0.03%, S:0.05% ~ 0.06%, surplus is Fe.
Embodiment 2: a kind of High-carbon gray cast iron automobile brake disk, described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.79% ~ 3.8%, Mn:0.78% ~ 0.8%, Cu:0.49% ~ 0.5%, Cr:0.19% ~ 0.2%, Mo:0.38% ~ 0.4%, Si:1.98% ~ 2.0%, N:0.19% ~ 0.2%, P:0.11% ~ 0.12%, S:0.11% ~ 0.12%, surplus is Fe.
Embodiment 3: a kind of High-carbon gray cast iron automobile brake disk, described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.75%, Mn:0.65%, Cu:0.4%, Cr:0.15%, Mo:0.3%, Si:1.8%, N:0.15%, P:0.05%, S:0.08%, surplus is Fe.
Embodiment 4: a kind of High-carbon gray cast iron automobile brake disk, described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.74%, Mn:0.60%, Cu:0.43%, Cr:0.14%, Mo:0.33%, Si:1.65%, N:0.17%, P:0.09%, S:0.11%, surplus is Fe.
Embodiment 5: a kind of High-carbon gray cast iron automobile brake disk, described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.76%, Mn:0.72%, Cu:0.38%, Cr:0.19%, Mo:0.28%, Si:1.75%, N:0.13%, P:0.04%, S:0.07%, surplus is Fe.
Embodiment 6: a kind of High-carbon gray cast iron automobile brake disk, described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.78%, Mn:0.65%, Cu:0.49%, Cr:0.13%, Mo:0.32%, Si:1.69%, N:0.145%, P:0.06%, S:0.085%, surplus is Fe.
Embodiment 7: a kind of High-carbon gray cast iron automobile brake disk, described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.75%, Mn:0.56%, Cu:0.39%, Cr:0.17%, Mo:0.29%, Si:1.67%, N:0.16%, P:0.04%, S:0.05%, surplus is Fe.
Embodiment 8: a kind of High-carbon gray cast iron automobile brake disk, described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.73% ~ 3.738%, Mn:0.58% ~ 0.585%, Cu:0.37% ~ 0.373%, Cr:0.13% ~ 0.137%, Mo:0.28% ~ 0.283%, Si:1.65% ~ 1.66%, N:0.13% ~ 0.135%, P:0.03% ~ 0.034%, S:0.07% ~ 0.075%, surplus is Fe.
Embodiment 9: a kind of High-carbon gray cast iron automobile brake disk, described High-carbon gray cast iron automobile brake disk chemical composition components by weight percentage is as follows: C:3.765% ~ 3.77%, Mn:0.727% ~ 0.73%, Cu:0.445% ~ 0.45%, Cr:0.182% ~ 0.19%, Mo:0.342% ~ 0.35%, Si:1.795% ~ 1.80%, N:0.167% ~ 0.17%, P:0.088% ~ 0.09%, S:0.093% ~ 0.10%, surplus is Fe.
Embodiment 10: a certain model High-carbon gray cast iron automobile brake disk, C content (by weight percentage) is brought up to 3.75% on common retarding disc 3.4% basis, Si content (by weight percentage) is reduced to 1.65% on the basis of common retarding disc 2.4%, adjusting and improving alloying element makes this retarding disc content of pearlite in alloy be 95%, ferrite content is 5%, component (by weight percentage) contained by the High-carbon gray cast iron automobile brake disk of this model and performance analysis as follows:
| Heat (batch) number bag | C% | Si% | Mn% | P% | S% | Cu% | Ｍo% | Perlite | Tensile strength | Hardness |
| 3X12C11-4 | 3.75 | 1.65 | 0.76 | 0.07 | 0.09 | 0.48 | 0.35 | 95 | 240 | 230 |
These all the other components of model High-carbon gray cast iron automobile brake disk (by weight percentage) are: N:0.17%, Cr:0.12%, and surplus is Fe.
Owing to adding C content in this model retarding disc chemical composition, thus graphite length is added, improve heat conduction situation, easy heat radiation, reduce Si content, adjust and improve intensity and the hardness that retarding disc usually improves in alloy part unit, thus make retarding disc in mechanical property, tension intensity, hardness, cutting ability, wear-resisting, the aspects such as antifatigue reach a new height, have wear-resisting, heat resistanceheat resistant, the effect of antifatigue, extend the work-ing life of retarding disc, common retarding disc generally uses 3 years needs to change, adopt basic 6 years of this model retarding disc without the need to changing, save cost, economic worth is high.
Embodiment 11: a kind of production method of High-carbon gray cast iron automobile brake disk, described production method comprises the following steps:
Step 1: prepare starting material: the magnesium iron pig iron, low-carbon waste steel, ferrochrome, molybdenum-iron, ferromanganese, electrolytic copper, CrN, high violent steel scrap;
Step 2: dissolve: the magnesium iron pig iron, low-carbon waste steel are added in middle frequency furnace, described middle frequency furnace rated output is 2200KW, melting rate 3.4t/h, smelting state is 565w.h/t, melting 3 hours, treats that furnace charge melts completely, when temperature reaches 1550 DEG C, to its sampling, by its chemical composition of spectrum analyzer rapid detection; According to detected result, add high violent steel scrap, to adjust and meet that C content accounts for total component 3.79%.Adjust and add ferrochrome adjustment alloying elements cr, making Cr remain on 0.13% of total component; Adjust and add molybdenum-iron adjustment Alloy Elements Mo, making Mo remain on 0.35% of total component; Adjust and add CrN and adjust alloying element N, make N remain on 0.14% of total component; Adjust and add ferromanganese adjustment alloying element Mn, making Mn remain on 0.75% of total component; Continue to be warming up to 1530 DEG C, come out of the stove, iron liquid is put into bull ladle, adjusts in bull ladle and add electrolytic copper, make the content of Cu be account for total component 0.45%; Adjustment elements Si, P, S, its amount accounting for total component is by weight percentage met: Si:1.78%, P:0.08%, S:0.08%, surplus is Fe;
Step 3: cast: in bull ladle, iron liquid liquid level is ladle-to-ladle lower than starting during bag mouth 32mm, and when ladle-to-ladle, iron liquid is poured in pouring ladle, in casting process, the strict duration of pouring controlling whole iron clad water, 12min completes cast, and cast terminates to unpack for latter 3 hours, take off part, foundry goods horizontal is cooled, free shrink, cleaning dead head and burr, cylinder impeller blasting cast(ing) surface oxide skin and local scab, polishing dead head undesirable root;
Step 4: thermal treatment: foundry goods is heat-treated by heat treatment furnace, heat treatment process parameter is: normal temperature (20 DEG C ~ 25 DEG C) enters stove, is warming up to 550 DEG C with 100 DEG C/h temperature rise rate, then keeps constant temperature 4h, cool to 300 DEG C with the furnace to come out of the stove, and carry out air cooling;
Step 5: adopt traditional mechanical workout pattern, processes it by drawing matching requirements size, then carries out transient equilibrium detection, when needing, duplicate removal process is carried out to converted products, carry out magnetic-particle inspection afterwards again, detect the defects such as casting crack, described magnetic-particle inspection method is by iron and steel etc.
magneticsubstancemake
workpiecegive
magnetization, utilize the leakage field of its rejected region to adsorb
magneticfeature, according to magnetic distribution display be detected object
surface imperfectionwith near surface flaw
a kind ofmethod.The foundry goods of crackle is had directly to discard by detecting, the formation finished product of flawless defect.
Embodiment 12: a kind of production method of High-carbon gray cast iron automobile brake disk, comprises the following steps:
Step 1: prepare starting material: the magnesium iron pig iron, low-carbon waste steel, composite inoculant and fine granularity nucleating agent, ferrochrome, molybdenum-iron, ferromanganese, electrolytic copper, MnN;
Step 2: dissolve: the magnesium iron pig iron, low-carbon waste steel are added in middle frequency furnace, described middle frequency furnace is 3T middle frequency furnace, rated output is 2000KW, melting rate 3.3t/h, smelting state is 560w.h/t, melting 2 hours, treat that furnace charge melts completely, when temperature reaches 1500 DEG C, to its sampling, by its chemical composition of spectrum analyzer rapid detection; According to detected result, ensure that C accounts for 3.75% of total component by weight percentage, adjust and add ferrochrome adjustment alloying elements cr, making Cr remain on 0.17% of total component; Adjust and add molybdenum-iron adjustment Alloy Elements Mo, making Mo remain on 0.29% of total component, adjust and add MnN adjustment alloying element N, making N remain on 0.16% of total component, adjust and add ferromanganese adjustment alloying element Mn, making Mn remain on 0.56% of total component; Continue to be warming up to 1520 DEG C, come out of the stove, iron liquid is put into bull ladle, the for a change crystallization condition of iron liquid, eliminate spoken parts in traditional operas, artificial increase graphite wafer check figure, obtain fine platy graphite structure, reduce ferritic content in matrix, refine pearlite lamellar spacing simultaneously, improve the performance of graphitic cast iron, improve the homogeneity of the structure and properties of casting section, reduce sensitivity profile, pour the composite inoculant accounting for the total component 0.4% of raw material at the Shi Suiliu that taps a blast furnace, described composite inoculant composition is based on SiFe alloy, and barium, calcium, rare earth element are added in combination.Adjust in bull ladle and add electrolytic copper, making the content of Cu be account for total component 0.39%; Adjustment elements Si, P, S, its amount accounting for total component is by weight percentage met: Si:1.67%, P:0.04%, S:0.05%, surplus main ingredient is Fe;
Step 3: cast: in bull ladle, iron liquid liquid level is ladle-to-ladle lower than starting during bag mouth 30mm, and when ladle-to-ladle, iron liquid is poured in pouring ladle, the strict duration of pouring controlling whole iron clad water in casting process, 10min completes cast, in parcel, the fine granularity nucleating agent accounting for the total component 0.13% of raw material is added during cast, carry out instant inoculation, prevent inoculation fade; Described fine granularity nucleating agent is classified by particle size, and the present embodiment granularity used is 1-3, is a kind of low silicon barium calcium nucleating agent, because its dynamics is small, is mainly used in instant inoculation.Cast terminates to unpack for latter 2 hours, takes off part, foundry goods horizontal is cooled, free shrink, cleaning dead head and burr, cylinder impeller blasting cast(ing) surface oxide skin and local scab, polishing dead head undesirable root;
Step 4: thermal treatment: foundry goods is heat-treated by heat treatment furnace, heat treatment process parameter is: normal temperature (20 DEG C ~ 25 DEG C) enters stove, is warming up to 530 DEG C with 80 DEG C/h temperature rise rate, then keeps constant temperature 3.5h, cool to 280 DEG C with the furnace to come out of the stove, and carry out air cooling;
Step 5: adopt traditional mechanical workout pattern, processes it by drawing matching requirements size, then carries out transient equilibrium detection, when needing, duplicate removal process is carried out to converted products, carry out magnetic-particle inspection afterwards again, detect the defects such as casting crack, described magnetic-particle inspection method is by iron and steel etc.
magneticsubstancemake
workpiecegive
magnetization, utilize the leakage field of its rejected region to adsorb
magneticfeature, according to magnetic distribution display be detected object
surface imperfectionwith near surface flaw
a kind ofmethod.The foundry goods of crackle is had directly to discard by detecting, the formation finished product of flawless defect.
Embodiment 13: a kind of production method of High-carbon gray cast iron automobile brake disk, described production method comprises the following steps:
Step 1: prepare starting material: the magnesium iron pig iron, low-carbon waste steel, composite inoculant and fine granularity nucleating agent, ferrochrome, molybdenum-iron, ferromanganese, electrolytic copper, MnN, the carburelant that carbon content is greater than 98.5%;
Step 2: dissolve: the magnesium iron pig iron, low-carbon waste steel are added in middle frequency furnace, described middle frequency furnace rated output is 1800KW, melting rate 3.2t/h, smelting state is 550kw.h/t, melting 1 hour, treats that furnace charge melts completely, when temperature reaches 1450 DEG C, to its sampling, by its chemical composition of spectrum analyzer rapid detection; According to detected result, add the carburelant that carbon content is greater than 98.5%, to adjust and meet that C content accounts for total component 3.73% ~ 3.77%, adjust and add ferrochrome adjustment alloying elements cr, making Cr remain on 0.17% of total component, adjust and add molybdenum-iron adjustment Alloy Elements Mo, make Mo remain on 0.28% of total component, adjust and add MnN adjustment alloying element N, making the content of N remain on 0.19% of total component, adjust and add ferromanganese adjustment alloying element Mn, making Mn remain on 0.8% of total component; Continue to be warming up to 1510 DEG C, come out of the stove, iron liquid is put into bull ladle, and pour the composite inoculant accounting for the total component 0.3% of raw material at the Shi Suiliu that taps a blast furnace, described composite inoculant composition is based on SiFe alloy, and barium, calcium, rare earth element are added in combination.Adjust in bull ladle and add electrolytic copper, making the content of Cu account for 0.5% of total component; Adjustment elements Si, P, S, make its amount accounting for total component by weight percentage meet Si:1.65%, P:0.11%, S:0.12%, surplus main ingredient is Fe;
Step 3: cast: in bull ladle, iron liquid liquid level is ladle-to-ladle lower than starting during bag mouth 28mm, and when ladle-to-ladle, iron liquid is poured in pouring ladle, the strict duration of pouring controlling whole iron clad water in casting process, 6min completes cast, in parcel, the fine granularity nucleating agent accounting for the total component 0.1% of raw material is added during cast, carry out instant inoculation, prevent inoculation fade; Described fine granularity nucleating agent is classified by particle size, and the present embodiment granularity used is 1-3, is a kind of low silicon barium calcium nucleating agent, because its dynamics is small, is mainly used in instant inoculation.Cast terminates to unpack for latter 1 hour, takes off part, foundry goods horizontal is cooled, free shrink, cleaning dead head and burr, cylinder impeller blasting cast(ing) surface oxide skin and local scab, polishing dead head undesirable root;
Step 4: thermal treatment: foundry goods is heat-treated by heat treatment furnace, heat treatment process parameter is: normal temperature (20 DEG C ~ 25 DEG C) enters stove, is warming up to 520 DEG C with 60 DEG C/h temperature rise rate, then keeps constant temperature 3h, cool to 250 DEG C with the furnace to come out of the stove, and carry out air cooling;
Step 5: adopt traditional mechanical workout pattern, by drawing matching requirements size, it is processed, then transient equilibrium detection is carried out, when needing, duplicate removal process is carried out to converted products, carry out magnetic-particle inspection afterwards again, detect the defects such as casting crack, have the foundry goods of crackle directly to discard, the formation finished product of flawless defect.
Embodiment 14: the present embodiment content is substantially identical with embodiment 13 content, same section content no longer repeats, as different from Example 13: in the present embodiment step 3, also pour into a mould test wedge when pouring into a mould and starting, middle and the latter stage in cast, pour into a mould chemical composition sample respectively, every iron clad water pours into a mould one group of tensile test bar blank, described test wedge, chemical composition sample, tensile test bar blank are respectively when same stove molten iron melts and materials, after cooling, test wedge is triangular in shape, for observing material; Chemical composition sample is rhombus, for changing into analysis; Tensile test bar blank is vertical cyclindrical shape, for tension test.Test wedge by analysis after test, chemical composition sample, tensile test bar blank for preservation of filing, the present embodiment in order to review material, do not waste material preserved three kinds of samples melted down from white silk.
Claims (5)
1. a production method for High-carbon gray cast iron automobile brake disk, is characterized in that: comprise the following steps:
Step 1: prepare starting material: the magnesium iron pig iron, low-carbon waste steel, ferrochrome, molybdenum-iron, ferromanganese, electrolytic copper, MnN or CrN;
Step 2: fusing: the magnesium iron pig iron, low-carbon waste steel are added in middle frequency furnace, described middle frequency furnace rated output is 1800 ~ 2200KW, melting rate 3.2 ~ 3.4t/h, smelting state is 550k ~ 565w.h/t, melting 1 ~ 3 hour, treats that furnace charge melts completely, when temperature reaches 1450 DEG C ~ 1550 DEG C, to its sampling, by its chemical composition of spectrum analyzer rapid detection; According to detected result, ensure that C accounts for 3.7% ~ 3.8% of total component by weight percentage, adjust and add ferrochrome adjustment alloying elements cr, make Cr remain on 0.1% ~ 0.2% of total component, adjust and add molybdenum-iron adjustment Alloy Elements Mo, making Mo remain on 0.2% ~ 0.4% of total component, adjust and add MnN or CrN and adjust alloying element N, make N remain on 0.1% ~ 0.2% of total component, adjust and add ferromanganese adjustment alloying element Mn, making Mn remain on 0.5% ~ 0.8% of total component; Continue to be warming up to 1510 DEG C ~ 1530 DEG C, come out of the stove, iron liquid is put into bull ladle, adjusts in bull ladle and add electrolytic copper, make the content of Cu be account for total component 0.3% ~ 0.5%; Adjustment elements Si, P, S, its amount accounting for total component is by weight percentage met: Si:1.6% ~ 2.0%, P:0.01% ~ 0.12%, S:0.05% ~ 0.12%, surplus is Fe;
Step 3: cast: in bull ladle, iron liquid liquid level is ladle-to-ladle lower than starting during bag mouth 28 ~ 32mm, and when ladle-to-ladle, iron liquid is poured in pouring ladle, in casting process, the strict duration of pouring controlling whole iron clad water, completes cast at 6 ~ 12min, within after cast terminates 1 ~ 3 hour, unpacks, take off part, foundry goods horizontal is cooled, free shrink, cleaning dead head and burr, cylinder impeller blasting cast(ing) surface oxide skin and local scab, polishing dead head undesirable root;
Step 4: thermal treatment: foundry goods is heat-treated by heat treatment furnace, heat treatment process parameter is: normal temperature enters stove, is warming up to 520 ~ 550 DEG C with 60 ~ 100 DEG C/h temperature rise rate, then keeps constant temperature 3 ~ 4h, cool to 250 ~ 300 DEG C with the furnace to come out of the stove, and carry out air cooling;
Step 5: adopt traditional mechanical workout pattern, by drawing matching requirements size, it is processed, then transient equilibrium detection is carried out, as required duplicate removal process is carried out to converted products, carry out magnetic-particle inspection afterwards again, detect casting crack defect, have the foundry goods of crackle directly to discard, the formation finished product of flawless defect.
2. the production method of High-carbon gray cast iron automobile brake disk according to claim 1, it is characterized in that: total also pour with stream the composite inoculant accounting for raw material component 0.3% ~ 0.5% when coming out of the stove in described step 2, in parcel, when pouring into a mould in described step 3, also add the fine granularity nucleating agent accounting for the total component 0.1% ~ 0.15% of raw material.
3. the production method of High-carbon gray cast iron automobile brake disk according to claim 1, it is characterized in that: in described step 3, also pour into a mould test wedge when pouring into a mould and starting, in cast, in middle and latter stage, pour into a mould chemical composition sample respectively, every iron clad water pours into a mould one group of tensile test bar blank.
4. the production method of High-carbon gray cast iron automobile brake disk according to claim 1, it is characterized in that: according to detected result in described step 2, if C accounts for the amount of total component by weight percentage lower than 3.7%, add the carburelant that high manganese steel scrap or carbon content are greater than 98.5%, to adjust and meet that C content accounts for total component 3.7 ~ 3.8%.
5. the production method of High-carbon gray cast iron automobile brake disk according to claim 1, it is characterized in that: according to detected result in described step 2, if C accounts for the amount of total component by weight percentage lower than 3.7%, add the carburelant that high manganese steel scrap or carbon content are greater than 98.5%, to adjust and meet that C content accounts for total component 3.73% ~ 3.77%.
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