CN104073712A - High-carbon vanadium titanium grey cast iron and manufacturing method thereof, as well as vehicle brake disk and manufacturing method thereof - Google Patents
High-carbon vanadium titanium grey cast iron and manufacturing method thereof, as well as vehicle brake disk and manufacturing method thereof Download PDFInfo
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- CN104073712A CN104073712A CN201410320124.8A CN201410320124A CN104073712A CN 104073712 A CN104073712 A CN 104073712A CN 201410320124 A CN201410320124 A CN 201410320124A CN 104073712 A CN104073712 A CN 104073712A
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 109
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 229910001060 Gray iron Inorganic materials 0.000 title claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 127
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 18
- 239000010936 titanium Substances 0.000 claims abstract description 18
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 18
- 239000010439 graphite Substances 0.000 claims abstract description 14
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 14
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 239000011651 chromium Substances 0.000 claims abstract description 12
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000010703 silicon Substances 0.000 claims abstract description 7
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 7
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 5
- 229910001018 Cast iron Inorganic materials 0.000 claims description 76
- 229910052742 iron Inorganic materials 0.000 claims description 60
- 238000005266 casting Methods 0.000 claims description 32
- 230000006698 induction Effects 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 22
- 238000002844 melting Methods 0.000 claims description 21
- 230000008018 melting Effects 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- MRHSJWPXCLEHNI-UHFFFAOYSA-N [Ti].[V].[Fe] Chemical compound [Ti].[V].[Fe] MRHSJWPXCLEHNI-UHFFFAOYSA-N 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 7
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 7
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 239000005864 Sulphur Substances 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 230000000979 retarding effect Effects 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- -1 sodium aluminum fluoride Chemical compound 0.000 claims 2
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000000758 substrate Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 31
- 229910052748 manganese Inorganic materials 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 238000011534 incubation Methods 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 239000003643 water by type Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 208000034189 Sclerosis Diseases 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 210000001161 mammalian embryo Anatomy 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 208000025599 Heat Stress disease Diseases 0.000 description 1
- 241000863032 Trieres Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000923 precious metal alloy Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses high-carbon vanadium titanium grey cast iron, comprising the following components in percentage by weight: 3.8-4.2% of carbon, 0.4-0.8% of silicon, 0.4-0.8% of manganese, 0.15-0.25% of vanadium, 0.10-0.25% of titanium, not greater than 0.25% of chromium and the balance of ferrum and other impurities. In the high-carbon vanadium titanium grey cast iron, the content of pearlite is greater than 95%, the content of A type graphite is greater than 80%, and V, Ti and common metal elements with lower cost are used for reducing the cost; V and Ti can be used for greatly thinning the graphite and a substrate in a high-carbon vanadium titanium grey cast iron structure and is quite easy to form hardening phases VC and TiC with high microhardness with a carbon electrode, respectively, so that the hardness is improved. In addition, the content of pearlite in the high-carbon vanadium titanium grey cast iron is greater than 95%, so that such mechanical properties as tensile strength and hardness are improved; moreover, since the content of A type graphite is greater than 80%, the abrasive resistance and the heat resistance are improved. In addition, the invention further provides a manufacturing method of high-carbon vanadium titanium grey cast iron, as well as a vehicle brake disk made from high-carbon vanadium titanium grey cast iron and a manufacturing method thereof.
Description
Technical field
The present invention relates to cast iron alloy and auto parts field, particularly a kind of high-carbon vanadium titanium graphitic cast iron and manufacture method, automobile brake disc and manufacture method.
Background technology
Retarding disc is the important component part of automobile brake system, is the important leverage of vehicle safety travel.In recent years, along with the fast development of China's road traffic, automobile is progressively to future developments such as high speed, heavy duty, lightweights, and this has higher requirement to brake system of car performance.
Now, the material of automobile brake disc is all generally to adopt common graphitic cast iron and low-alloy cast iron two classes.Because the strength of materials, the hardness of common grey iron are lower, be prone to serious wear or heat fatigue cracking situation, can not meet present situation automobile high loading, high-speed requirement.Low-alloy cast iron is mainly in plain cast iron, to have added the precious metal alloys elements such as Ni, Mo, although can meet high-intensity requirement, production cost is high.
Summary of the invention
In order to solve the problem of prior art, the invention process provides high-carbon vanadium titanium graphitic cast iron and the manufacture method that a kind of cost is low and intensity is high, automobile brake disc and the manufacture method by this high-carbon vanadium titanium graphitic cast iron, made.Described technical scheme is as follows:
A kind of high-carbon vanadium titanium graphitic cast iron, according to weight percent, calculate, it comprises: 3.8～4.2% carbon, 0.4～0.8% silicon, 0.4～0.8% manganese, 0.15～0.25% vanadium, 0.10～0.25% titanium ,≤0.25% chromium, and surplus is iron and other impurity; And the content of pearlite in alloy in described high-carbon vanadium titanium graphitic cast iron is more than 95%, A type graphite content is more than 80%.
Preferably, described other impurity comprises p and s, and content≤0.1% of described sulphur is, content≤0.1% of described phosphorus.
Preferably, the carbon equivalent ce=C+1/3 (Si+P) of described high-carbon vanadium titanium graphitic cast iron), and described carbon equivalent ce is 4.00～4.6; Wherein, C represents the content of carbon in described high-carbon vanadium titanium graphitic cast iron, and Si represents the content of sulphur in described high-carbon vanadium titanium graphitic cast iron, and P represents the content of phosphorus in described high-carbon vanadium titanium graphitic cast iron.
A kind of manufacture method of high-carbon vanadium titanium graphitic cast iron, it is for the preparation of the high-carbon vanadium titanium graphitic cast iron described in any one in the claims 1 to 3, comprise the steps: S1, the initial material that the foundry returns of the steel scrap of the vanadium titanium iron of 40-45 weight part, 28-35 weight part and 25-32 weight part is formed drops into melting in medium-frequency induction furnace and obtains molten iron; S2 adds 0.1～0.15% 75SiFe, then the molten iron in step S1 is bred in described casting ladle in casting ladle; S3, can form described high-carbon vanadium titanium graphitic cast iron after the molten iron having bred casting in step S2.
Preferably, described step S1 comprises: S11, drops into the foundry returns of 25-32 weight part in medium-frequency induction furnace, then from the furnace bottom of medium-frequency induction furnace, adds the carburelant of 1.7-2.0%; S12, then the steel scrap of the vanadium titanium iron of 40-45 weight part and 28-35 weight part is dropped into described medium-frequency induction furnace and starts melting; S13, melting to initial material melted after 30-40 minute, after hot 8-13 minute, and then add successively the ferromanganese of 0.5-0.7%, the ferrotianium of the ferrochrome of 0.07-0.15%, 0.08-0.15% to carry out composition modified, the carbon equivalent that makes modified rear molten iron is 4.00～4.25.
Preferably, the carbon that in the molten iron after described step S13 is modified, the weight proportion of each chemical composition is 3.8～4.2%, 0.4～0.8% silicon, 0.4～0.8% manganese, 0.15～0.25% vanadium, 0.10～0.25% titanium, ≤ 0.25% chromium, surplus is iron and other impurity.
Preferably, in described step S1, also added 1.0～1.5% Wingdale of the gross weight of described initial material, and the granularity of described Wingdale is 30～50mm.
Preferably, the granularity of the 75SiFe adding in described step S1 is 0.5～2.0mm.
An automobile brake disc, it is formed by above-mentioned high-carbon vanadium titanium graphitic cast iron casting.
A manufacture method for automobile brake disc, comprises the steps: step a, and the high-carbon vanadium titanium gray cast iron smelting described in any one in the claims 1 to 3 is become to molten iron; Step b adds 0.1～0.2% 75SiFe of weight of molten iron in step a, then the molten iron in step a is poured in casting ladle and bred in casting ladle; Step c, pours into and in the sand mold chamber of retarding disc, start casting, and pouring temperature was 1370～1400 ℃ in the 5-8 of molten iron after step b has bred minute.
The beneficial effect that technical scheme provided by the invention is brought is:
High-carbon vanadium titanium graphitic cast iron of the present invention and manufacture method, automobile brake disc and manufacture method are passed through the raw body of abundant at a low price vanadium titanium as initial material; And V and Ti can make graphite and the matrix in high-carbon vanadium titanium microstructure of grey cast iron obtain remarkable refinement, and easily form microhardness high sclerosis phase VC and TiC with carbon electrode respectively simultaneously, improved hardness.In addition, the content of pearlite in alloy in high-carbon vanadium titanium microstructure of grey cast iron is more than 95%, has improved the mechanical properties such as tensile strength and hardness, and A type graphite content is more than 80%, has improved wear resistance and thermotolerance.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below embodiment of the present invention is described further in detail.
The invention process provides a kind of high-carbon vanadium titanium graphitic cast iron, according to weight percent, calculate, it comprises: 3.8～4.2% C (carbon), 0.4～0.8% Si (silicon), 0.4～0.8% Mn (manganese), 0.15～0.25% V (vanadium), 0.10～0.25% Ti (titanium) ,≤0.25% Cr (chromium), and surplus is Fe (iron) and other impurity; Wherein, the content of pearlite in alloy in above-mentioned high-carbon vanadium titanium graphitic cast iron is more than 95%, A type graphite content is more than 80%.
Above-mentioned other impurity comprises P (phosphorus) and S (sulphur), and wherein, S can make high-carbon vanadium titanium graphitic cast iron produce hot cracking tendency; P can make high-carbon vanadium titanium graphitic cast iron have cold cracking inclination.According to weight percent, calculate S content≤0.1%, P content≤0.1% of high-carbon vanadium titanium graphitic cast iron of the present invention.
Above-mentioned C and Si are the strong graphited elements that promotes, that is: in high-carbon vanadium titanium graphitic cast iron, the content of C and Si is high, its graphite is just many.Graphite can improve wear resistance and the thermotolerance of high-carbon vanadium titanium graphitic cast iron, therefore in order to guarantee the graphite in high-carbon vanadium titanium graphitic cast iron, in high-carbon vanadium titanium graphitic cast iron, just need certain carbon equivalent ce, CE=C+1/3 (Si+P) wherein), C represents the content of carbon in high-carbon vanadium titanium graphitic cast iron, Si represents the content of sulphur in high-carbon vanadium titanium graphitic cast iron, and P represents the content of phosphorus in high-carbon vanadium titanium graphitic cast iron.But the too high meeting of CE causes the pearlite fraction in high-carbon vanadium titanium microstructure of grey cast iron not enough, CE is too low can cause again the quantity of graphite in high-carbon vanadium titanium microstructure of grey cast iron not enough; Therefore, preferred, the carbon equivalent ce of high-carbon vanadium titanium graphitic cast iron of the present invention is 4.00～4.6.
In high-carbon vanadium titanium graphitic cast iron of the present invention, only have lower-cost V, Ti and common metal, reduced cost; And V and Ti can make graphite and the matrix in high-carbon vanadium titanium microstructure of grey cast iron obtain remarkable refinement, and easily form microhardness high sclerosis phase VC and TiC with carbon electrode respectively simultaneously, improved hardness.In addition, the content of pearlite in alloy in high-carbon vanadium titanium microstructure of grey cast iron is more than 95%, has improved the mechanical properties such as tensile strength and hardness, and A type graphite content is more than 80%, has improved wear resistance and thermotolerance.
In conjunction with test below, verify the performance of high-carbon vanadium titanium graphitic cast iron of the present invention:
3 parts of different above-mentioned high-carbon vanadium titanium graphitic cast iron of weight percent content are placed in respectively to the melting that heats up in medium-frequency induction furnace, and smelting temperature to control be 1530 ℃, to guarantee the purity of melt.The molten iron obtaining after melting completes is respectively through being cast into the test rod (according to GB9439-88 standard) of Φ 30 * 300 after having bred.
For convenient contrast, table 1 has been listed the chemical composition of the coupon that above-mentioned 3 test rods and the common graphitic cast iron HT300 that does not add vanadium titanium make; Wherein sample 1-3 is high-carbon vanadium titanium graphitic cast iron of the present invention; Sample number 4 coupons of making for the common graphitic cast iron HT300 that does not add vanadium titanium.
The chemical composition of table 1 test rod
The test rod of above-mentioned sample 1-4 is respectively processed to 2 tension coupons, 2 wear-resisting coupons, 2 hardness samples according to GB977-84 standard, GB/T12444. 2-2006 standard and GB231-84 standard respectively, and according to following condition, carry out tensile strength, hardness and cut resistance test respectively.
Test for tensile strength:
On WEW-300B type (300KN) the microcomputer hydraulic universal testing machine that stretch-proof test is produced in Jinan Memec testing installation company limited, under room temperature condition, carry out.The data of its tension test are as shown in table 2 below:
Table 2 tensile strength test data
As can be seen from Table 2, the test rod that the test rod tensile strength that high-carbon vanadium titanium graphitic cast iron of the present invention is made is made apparently higher than graphitic cast iron HT300, and exceed 12%～15%.
Hardness test:
The HB-3000C type Brinell tester that hardness test is produced at Laizhou City Huaxing testing tool carries out, and pressure head diameter is 5mm.The data of its tension test are as shown in table 3 below:
Table 3 hardness test data
As can be seen from Table 3, the test rod that the test rod hardness that high-carbon vanadium titanium graphitic cast iron of the present invention is made is made apparently higher than graphitic cast iron HT300.Consolidated statement 2 and table 3 can find out that test rod that high-carbon vanadium titanium graphitic cast iron of the present invention is made can reach and surpass the mechanical property requirements of the test rod that graphitic cast iron HT300 makes.
Cut resistance test:
On the MRH-3 type high-speed loop block abrasion tester that wear test is produced in Jinan trier factory, carry out.And test conditions is: metal to-metal contact, and load 49N, to mill material GCr15 steel, to bull ring rotating speed 300r/min, outer ring diameter 49.22mm, fraction time 30min.Its testing data is as shown in table 4 below:
Table 4 cut resistance test data
As shown in Table 4, the sample that high-carbon vanadium titanium graphitic cast iron of the present invention is made is compared with the test rod of making higher than graphitic cast iron HT300, and wear rate reduces by 15%～20%.Therefore, tensile strength, hardness and the cut resistance test of the test rod by above, and corresponding data can find out that tensile strength, hardness and the wear resisting property of high-carbon vanadium titanium graphitic cast iron of the present invention are good, and be all better than common grey iron HT300; And high-carbon vanadium titanium graphitic cast iron of the present invention is in common graphitic cast iron, to add lower-cost V, Ti, and Panzhihua Region has abundant v-ti magnetite ore resources, because utilize these Mineral resources effectively to reduce costs.
The present invention also provides a kind of manufacture method of high-carbon vanadium titanium graphitic cast iron, and it comprises the steps:
Step S1, the initial material that the foundry returns of the steel scrap of the vanadium titanium iron of 40-45 weight part, 28-35 weight part and 25-32 weight part is formed drops into melting in medium-frequency induction furnace and obtains molten iron.
Particularly, the first step, S11, drops into the foundry returns of 25-32 weight part in medium-frequency induction furnace, then from the furnace bottom of medium-frequency induction furnace, adds the carburelant of 1.7-2.0%.
Second step S12, then the steel scrap of the vanadium titanium iron of 40-45 weight part and 28-35 weight part is dropped in medium-frequency induction furnace, and start melting.In the process of melting, in medium-frequency induction furnace, the temperature of melting remains 1520～1530 ℃.Preferably, initial material is the foundry returns that weight part is 40 vanadium titanium iron, weight part is 30 steel scrap and weight part are 30.
The 3rd step S13, melting to middle initial material melted after 30-40 minute, after hot 8-13 minute, and then add successively the ferromanganese of 0.5-0.7%, the ferrotianium of the ferrochrome of 0.07-0.15%, 0.08-0.15% to carry out composition modified, making the carbon equivalent of the molten iron after modified is 4.00～4.6; And the C that in this molten iron, the weight proportion of each chemical composition is 3.8～4.2% (carbon), 0.4～0.8% Si (silicon), 0.4～0.8% Mn (manganese), 0.15～0.25% V (vanadium), 0.10～0.25% Ti (titanium) ,≤0.25% Cr (chromium), surplus is Fe (iron) and other impurity, now, cast iron melting completes.It should be noted that, the percentage composition of above-mentioned carburelant, ferrochrome, ferromanganese and ferrotianium is the per-cent that accounts for initial material weight.
Step S2 breeds the molten iron in step S1 8～12 minutes in casting ladle.Particularly, first in casting ladle, add 75SiFe, then the molten iron in frequency induction furnace is cooled to a little when temperature is 1480～1500 ℃ and is poured in casting ladle rapidly.And the weight of 75SiFe is to add 0.1～0.15% of weight of molten iron.
Step S3, forms high-carbon vanadium titanium graphitic cast iron after the molten iron casting after having bred.
In the present embodiment, for improving fluxing effect, in step S1, need add initial material gross weight 1.0～1.5%, and the granularity Wingdale that is 30～50mm.
In the present embodiment, in step S2, the granularity of 75SiFe is 0.5～2.0mm.
The method of producing high-carbon vanadium titanium graphitic cast iron in the present invention is described below in conjunction with concrete embodiment:
Embodiment mono-:
The foundry returns that is 27 by weight part drops in medium-frequency induction furnace, then adds 2.0% carburelant from the furnace bottom of medium-frequency induction furnace.Afterwards, the vanadium titanium iron that is 45 by weight part and weight part are that to drop into temperature be melting in the medium-frequency induction furnace of 1520 ℃ for 28 steel scrap.It is overheated 13 minutes that melting to material melted after 35 minutes, and then adding successively 0.15% ferrotianium, 0.7% ferromanganese, 0.15% ferrochrome to carry out composition, modified to make the carbon equivalent of molten iron be 4.500.And in this molten iron, the weight proportion of each chemical composition is: 4.2% C, and 0.8% Si, 0.8% Mn, 0.25% V, 0.25% Ti, 0.25% Cr, surplus is Fe and other impurity.
Above-mentioned molten iron is poured in casting ladle and bred, and the incubation time is 12min; Wherein, tapping temperature when molten iron is poured casting ladle into is 1480 ℃, and waters to wrap in and pour the 75SiFe that first adds weight of molten iron 0.2% before molten iron into, and granularity is 1mm.
After molten iron casting after having bred, form high-carbon vanadium titanium graphitic cast iron.
Embodiment bis-:
The foundry returns that is 25 by weight part drops in medium-frequency induction furnace, then adds 1.8% carburelant from the furnace bottom of medium-frequency induction furnace.Afterwards, the vanadium titanium iron that is 43 by weight part and weight part are that to drop into temperature be melting in the medium-frequency induction furnace of 1520 ℃ for 32 steel scrap.It is overheated 10 minutes that melting to material melted after 30 minutes, and then adding successively 0.12% ferrotianium, 0.6% ferromanganese, 0.12% ferrochrome to carry out composition, modified to make the carbon equivalent of molten iron be 4.30.And in this molten iron, the weight proportion of each chemical composition is: 4.0% C, and 0.6% Si, 0.6% Mn, 0.25% V, 0.18% Ti, 0.15% Cr, surplus is Fe and other impurity.
Gained molten iron is poured in casting ladle and bred, and the incubation time is 10min; Wherein, tapping temperature when molten iron is poured casting ladle into is 1500 ℃, and waters to wrap in and pour the 75SiFe that first adds weight of molten iron 0.5% before molten iron into, and granularity is 1.5mm.
After molten iron casting after having bred, form high-carbon vanadium titanium graphitic cast iron.。
Embodiment tri-:
The foundry returns that is 32 by weight part drops in medium-frequency induction furnace, then adds 1.7% carburelant from the furnace bottom of medium-frequency induction furnace.Afterwards, the vanadium titanium iron that is 40 by weight part and weight part are that to drop into temperature be melting in the medium-frequency induction furnace of 1525 ℃ for 28 steel scrap.It is overheated 8 minutes that melting to material melted after 40 minutes, and then adding successively 0.08% ferrotianium, 0.5% ferromanganese, 0.07% ferrochrome to carry out composition, modified to make the carbon equivalent of molten iron be 4.60.And in this molten iron, the weight proportion of each chemical composition is: 3.8% C, and 0.4% Si, 0.4% Mn, 0.15% V, 0.10% Ti, 0.1% Cr, surplus is Fe and other impurity.
Gained molten iron is poured in casting ladle and bred, and the incubation time is 8min; Wherein, tapping temperature when molten iron is poured casting ladle into is 1490 ℃, and waters to wrap in and pour the 75SiFe that first adds weight of molten iron 0.4% before molten iron into, and granularity is 0.8mm.
After molten iron casting after having bred, form high-carbon vanadium titanium graphitic cast iron.
The present invention also provides a kind of automobile brake disc, and it forms with above-mentioned high-carbon vanadium titanium graphitic cast iron casting.Particularly, the manufacture method of this automobile brake disc comprises the steps:
Step a, becomes molten iron by above-mentioned high-carbon vanadium titanium gray cast iron smelting; Preferably, in the process of melting, add granularity be the Wingdale of 30～50mm as slag former, add-on is weight of molten iron 1.0～1.5%
Step b, pours the molten iron in step a in casting ladle into and breeds, and the incubation time is 8～12min; Wherein, tapping temperature when molten iron is poured casting ladle into is 1480～1500 ℃, waters to wrap in and pours the 75SiFe that first adds weight of molten iron 0.1～0.2% before molten iron into;
Step c, pours in the 5-8 after step b has bred minute in the sand mold chamber of retarding disc and starts casting, and pouring temperature is 1370～1400 ℃.Cast and cooling after obtain the thick embryo of retarding disc.The thick embryo of retarding disc can obtain qualified automobile brake disc after ball blast and deburring.Preferably, in after having bred 6 minutes of molten iron, start casting.
It should be noted that, when high-carbon vanadium titanium graphitic cast iron of the present invention has improved mechanical property, wear resistance and the thermotolerances such as tensile strength and hardness, the automobile brake disc of being made by this high-carbon vanadium titanium graphitic cast iron obviously also has high-tensile and hardness and good wear resistance and thermotolerance.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a high-carbon vanadium titanium graphitic cast iron, it is characterized in that, according to weight percent, calculate, it comprises: 3.8～4.2% carbon, 0.4～0.8% silicon, 0.4～0.8% manganese, 0.15～0.25% vanadium, 0.10～0.25% titanium ,≤0.25% chromium, and surplus is iron and other impurity;
And the content of pearlite in alloy in described high-carbon vanadium titanium graphitic cast iron is more than 95%, A type graphite content is more than 80%.
2. high-carbon vanadium titanium graphitic cast iron according to claim 1, is characterized in that, described other impurity comprises p and s, and content≤0.1% of described sulphur is, content≤0.1% of described phosphorus.
3. high-carbon vanadium titanium graphitic cast iron according to claim 1, is characterized in that, the carbon equivalent ce=C+1/3 (Si+P) of described high-carbon vanadium titanium graphitic cast iron), and described carbon equivalent ce is 4.00～4.6; Wherein, C represents the content of carbon in described high-carbon vanadium titanium graphitic cast iron, and Si represents the content of sulphur in described high-carbon vanadium titanium graphitic cast iron, and P represents the content of phosphorus in described high-carbon vanadium titanium graphitic cast iron.
4. a manufacture method for high-carbon vanadium titanium graphitic cast iron, is characterized in that, it,, for the preparation of the high-carbon vanadium titanium graphitic cast iron described in any one in the claims 1 to 3, comprises the steps:
S1, the initial material that the foundry returns of the steel scrap of the vanadium titanium iron of 40-45 weight part, 28-35 weight part and 25-32 weight part is formed drops into melting in medium-frequency induction furnace and obtains molten iron;
S2 adds 0.1～0.15% 75SiFe, then the molten iron in step S1 is bred in described casting ladle in casting ladle;
S3, can form described high-carbon vanadium titanium graphitic cast iron after the molten iron having bred casting in step S2.
5. the manufacture method of high-carbon vanadium titanium graphitic cast iron according to claim 4, is characterized in that, described step S1 comprises: S11, drops into the foundry returns of 25-32 weight part in medium-frequency induction furnace, then from the furnace bottom of medium-frequency induction furnace, adds the carburelant of 1.7-2.0%;
S12, then the steel scrap of the vanadium titanium iron of 40-45 weight part and 28-35 weight part is dropped into described medium-frequency induction furnace and starts melting;
S13, melting to initial material melted after 30-40 minute, after hot 8-13 minute, and then add successively the ferromanganese of 0.5-0.7%, the ferrotianium of the ferrochrome of 0.07-0.15%, 0.08-0.15% to carry out composition modified, the carbon equivalent that makes modified rear molten iron is 4.00～4.25.
6. the manufacture method of high-carbon vanadium titanium graphitic cast iron according to claim 5, it is characterized in that, the carbon that in molten iron after described step S13 is modified, the weight proportion of each chemical composition is 3.8～4.2%, 0.4～0.8% silicon, 0.4～0.8% manganese, 0.15～0.25% vanadium, 0.10～0.25% titanium, ≤ 0.25% chromium, surplus is iron and other impurity.
7. the manufacture method of high-carbon vanadium titanium graphitic cast iron according to claim 4, it is characterized in that, in described step S1, also added 1.0～1.5% Wingdale or sodium aluminum fluoride of the gross weight of described initial material, and the granularity of described Wingdale or sodium aluminum fluoride is 30～50mm.
8. vanadium-titanium cast iron automobile brake disc according to claim 4, is characterized in that, the granularity of the 75SiFe adding in described step S1 is 0.5～2.0mm.
9. an automobile brake disc, is characterized in that, its casting of the high-carbon vanadium titanium graphitic cast iron described in any one in the claims 1 to 3 forms.
10. a manufacture method for automobile brake disc, is characterized in that, comprises the steps:
Step a, becomes molten iron by the high-carbon vanadium titanium gray cast iron smelting described in any one in the claims 1 to 3;
Step b adds 0.1～0.2% 75SiFe of weight of molten iron in step a, then the molten iron in step a is poured in casting ladle and bred in casting ladle;
Step c, pours into and in the sand mold chamber of retarding disc, start casting, and pouring temperature was 1370～1400 ℃ in the 5-8 of molten iron after step b has bred minute.
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| CN112708818A (en) * | 2019-10-25 | 2021-04-27 | 攀钢集团钛业有限责任公司 | Foundry pig iron and preparation method thereof |
| CN116287960A (en) * | 2022-12-02 | 2023-06-23 | 山东宏马工程机械有限公司 | High-heat-conductivity brake disc and preparation method thereof |
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