CN106148811A - A kind of automobile gas exhausting manifold branch high temperature resistant nodular cast iron part and preparation method thereof - Google Patents
A kind of automobile gas exhausting manifold branch high temperature resistant nodular cast iron part and preparation method thereof Download PDFInfo
- Publication number
- CN106148811A CN106148811A CN201610681042.5A CN201610681042A CN106148811A CN 106148811 A CN106148811 A CN 106148811A CN 201610681042 A CN201610681042 A CN 201610681042A CN 106148811 A CN106148811 A CN 106148811A
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- CN
- China
- Prior art keywords
- ferrum liquid
- high temperature
- bag
- gas exhausting
- manifold branch
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
Abstract
The invention discloses a kind of automobile gas exhausting manifold branch high temperature resistant nodular cast iron part and preparation method thereof, the percentage by weight of each chemical constituent of this nodular iron casting is: C 3.2 3.8%, Si 4.9 5.3%, Mo 1.3 1.8%, Mn 0.7 1.1%, Cr 0.5 0.8%, Al 0.2 0.4%, V 0.1 0.2%, Nb 0.3 0.6%, Co 0.2 0.5%, Pm 0.05 0.1%, P≤0.04%, S≤0.02%, and surplus is Fe.The present invention is by improving the content of Si, Mo, Mn, it is simultaneously introduced the alloying elements such as Al, Nb, Co, Pm, and by adjusting casting smelting technique, in conjunction with the rational spheroidizing process of science and Technology for Heating Processing, the nodular iron casting prepared is made at high temperature to have good mechanical performance and chemical stability, use temperature up to 900 1000 DEG C, fully meet the use requirement of automobile gas exhausting manifold branch.
Description
Technical field
The present invention relates to a kind of automobile gas exhausting manifold branch high temperature resistant nodular cast iron part and preparation method thereof, belong to spheroidal graphite cast-iron
Technical field.
Background technology
The birth of automobile has had the history of a century, quickly grows, has the most become the most topmost vehicles
With the important driving force spurred economic growth, also it is that people live indispensable important component part.Foundry goods is automobile product
One of important composition of parts, cast product application on auto parts and components occupies critical role.The master of automotive castings
Want feature be complex-shaped, wall thickness is relatively thin, dimensional accuracy is high, production lot is big, require that reliability is the most high.Automobile will to the greatest extent may be used
Low can alleviate own wt, it is desirable to foundry goods should be light, also to have the highest intensity.The material of past many auto parts and components
It is casting pig, the most mostly changes nodular iron casting into.
Automobile gas exhausting manifold branch is one of vitals of automobile exhaust system, and it is connected with automobile engine by flange,
And the waste gas produced in electromotor is discharged outside car, its internal temperature is close to engine temperature, and outside contacts with natural environment,
Its operating temperature is at 150-200 DEG C.In order to protect environment, auto-maker improves the burning of fuel by updating technology
Rate and discharge the purifying rate of gas, result makes the temperature of discharge gas more and more higher, and the delivery temperature of part vehicle is even more than
800 DEG C.This resistance to elevated temperatures just requiring there is excellence for the nodular iron casting of automobile gas exhausting manifold branch.
Summary of the invention
It is an object of the invention to provide a kind of automobile gas exhausting manifold branch high temperature resistant nodular cast iron part and preparation method thereof.
For achieving the above object, the present invention adopts the following technical scheme that
A kind of automobile gas exhausting manifold branch high temperature resistant nodular cast iron part, the percentage by weight of its each chemical constituent is: C 3.2-3.8%,
Si 4.9-5.3%、Mo 1.3-1.8%、Mn 0.7-1.1%、Cr 0.5-0.8%、Al 0.2-0.4%、V 0.1-0.2%、Nb
0.3-0.6%, Co 0.2-0.5%, Pm 0.05-0.1%, P≤0.04%, S≤0.02%, surplus is Fe.
The preparation method of a kind of automobile gas exhausting manifold branch high temperature resistant nodular cast iron part, comprises the following steps:
(1) weigh the furnace charges such as the pig iron, steel scrap, molybdenum filament, carborundum, ferromanganese, foundry returns to join in medium-frequency induction furnace and melt
Refining, smelting temperature is 1460-1490 DEG C, and after furnace charge all melts, sample analysis also adjusts ferrum liquid composition, rises after reaching requirement
Temperature, to 1520-1550 DEG C, is 200-300W at power, and rotating speed is magnetic agitation 10-under conditions of 1000-1500r/min
15min, stands 20-30min, comes out of the stove；
(2), before ferrum liquid is come out of the stove, first add in the base wells on bag dam, nodularization bag side and be equivalent to ferrum liquid quality 1.2-1.4%
Rare earth ferrosilicomagnesium nodulizer, covers the silicon strontium inovulant being equivalent to ferrum liquid quality 0.5-0.8% on nodulizer, is then breeding
Agent surface uniformly spreads that last layer is clean, be dried, rustless magnesium iron is considered to be worth doing and consolidated, when ferrum liquid is come out of the stove, by ferrum liquid by lid bag aperture
Carrying out nodularization and inoculation in flowing into nodularization bag, temperature controls, at 1470-1510 DEG C, after treating spheroidizing reacion, to exist immediately
Collection swelling perlite powder is spread on ferrum liquid surface, is 500-600W at power, and frequency is ultrasonic vibration 20-under conditions of 30-40kHz
30mim, and scratch clean the scum silica frost on ferrum liquid surface, stand 10-15min, then chill block analysis is produced in sampling, and detection nodularization is qualified
After can pour into a mould；
(3) before cast, nodularization bag and bag being baked to 780-840 DEG C, pouring temperature controls at 1440-1460 DEG C, cast speed
Degree controls at 0.4-0.6kg/s；
(4) foundry goods to moulding by casting carries out heat treatment: first with the ramp of 60-80 DEG C/h to 540-580 DEG C, be incubated 4-
6h, then with the ramp of 50-70 DEG C/h to 920-960 DEG C, it is incubated 2-4h；Then Cooling Quenching in 0-80 DEG C of cold oil is put into,
Cooling 5-20s；Last microwave heating 3-4h under conditions of power is 300-400W, then under conditions of power is 700-800W
Microwave heating 1-2h, air cooling of coming out of the stove.
Beneficial effects of the present invention:
The present invention, by improving the content of Si, Mo, Mn, is simultaneously introduced the alloying elements such as Al, Nb, Co, Pm, and is cast by adjustment
Smelting technology, in conjunction with the rational spheroidizing process of science and Technology for Heating Processing, makes the nodular iron casting prepared at high temperature have good
Good mechanical performance and chemical stability, use temperature up to 900-1000 DEG C, and the use fully meeting automobile gas exhausting manifold branch is wanted
Ask.
Detailed description of the invention
A kind of automobile gas exhausting manifold branch high temperature resistant nodular cast iron part, the percentage by weight of its each chemical constituent is: C 3.2-
3.8%、Si 4.9-5.3%、Mo 1.3-1.8%、Mn 0.7-1.1%、Cr 0.5-0.8%、Al 0.2-0.4%、V 0.1-0.2%、
Nb 0.3-0.6%, Co 0.2-0.5%, Pm 0.05-0.1%, P≤0.04%, S≤0.02%, surplus is Fe.
The preparation method of a kind of automobile gas exhausting manifold branch high temperature resistant nodular cast iron part, comprises the following steps:
(1) weigh the furnace charges such as the pig iron, steel scrap, molybdenum filament, carborundum, ferromanganese, foundry returns to join in medium-frequency induction furnace and melt
Refining, smelting temperature is 1480 DEG C, and after furnace charge all melts, sample analysis also adjusts ferrum liquid composition, is warming up to after reaching requirement
1530 DEG C, be 250W at power, and rotating speed is magnetic agitation 12min under conditions of 1200r/min, stands 25min, comes out of the stove；
(2), before ferrum liquid is come out of the stove, in the base wells on bag dam, nodularization bag side, the rare earth being equivalent to ferrum liquid quality 1.3% is first added
Magnesium ferrosilicon nodulizer, covers the silicon strontium inovulant being equivalent to ferrum liquid quality 0.7% on nodulizer, then equal on inovulant surface
Even spread that last layer is clean, be dried, rustless magnesium iron consider and consolidated, when ferrum liquid is come out of the stove, by ferrum liquid by the inflow nodularization of lid bag aperture
Carrying out nodularization and inoculation in bag, temperature controls at 1490 DEG C, after treating spheroidizing reacion, spreads collection immediately on ferrum liquid surface swollen
Swollen crushed crude pearlite, is 550W at power, and frequency is ultrasonic vibration 25mim under conditions of 35kHz, and scratches clean the floating of ferrum liquid surface
Slag, stands 15min, and then chill block analysis is produced in sampling, can pour into a mould after detection nodularization is qualified；
(3) before cast, nodularization bag and bag being baked to 800 DEG C, pouring temperature controls at 1450 DEG C, and poring rate controls
0.5kg/s；
(4) foundry goods to moulding by casting carries out heat treatment: first with the ramp of 70 DEG C/h to 560 DEG C, be incubated 5h, then with 60
DEG C/ramp of h to 940 DEG C, be incubated 3h；Then put into Cooling Quenching in 25 DEG C of cold oil, cool down 10s；At power it is finally
Microwave heating 4h under conditions of 350W, microwave heating 1.5h under conditions of power is 750W, air cooling of coming out of the stove.
Through inspection, its mechanical property is: tensile strength 724Mpa, yield strength 649Mpa, percentage elongation 13.3%, and 950 DEG C go out
The cycle-index of existing crackle: 586 times.
Claims (2)
1. an automobile gas exhausting manifold branch high temperature resistant nodular cast iron part, it is characterised in that the percentage by weight of its each chemical constituent
For: C 3.2-3.8%, Si 4.9-5.3%, Mo 1.3-1.8%, Mn 0.7-1.1%, Cr 0.5-0.8%, Al 0.2-0.4%, V
0.1-0.2%, Nb 0.3-0.6%, Co 0.2-0.5%, Pm 0.05-0.1%, P≤0.04%, S≤0.02%, surplus is Fe.
2. a preparation method for automobile gas exhausting manifold branch high temperature resistant nodular cast iron part as claimed in claim 1, its feature exists
In comprising the following steps:
Weigh the furnace charges such as the pig iron, steel scrap, molybdenum filament, carborundum, ferromanganese, foundry returns to join medium-frequency induction furnace carries out melting,
Smelting temperature is 1460-1490 DEG C, and after furnace charge all melts, sample analysis also adjusts ferrum liquid composition, heats up after reaching requirement
To 1520-1550 DEG C, being 200-300W at power, rotating speed is magnetic agitation 10-15min under conditions of 1000-1500r/min,
Stand 20-30min, come out of the stove；
Before ferrum liquid is come out of the stove, in the base wells on bag dam, nodularization bag side, first add the rare earth being equivalent to ferrum liquid quality 1.2-1.4%
Magnesium ferrosilicon nodulizer, covers the silicon strontium inovulant being equivalent to ferrum liquid quality 0.5-0.8%, then at inovulant table on nodulizer
Face uniformly spreads that last layer is clean, be dried, rustless magnesium iron consider and consolidated, when ferrum liquid is come out of the stove, by ferrum liquid by the inflow of lid bag aperture
Carrying out nodularization and inoculation in nodularization bag, temperature controls at 1470-1510 DEG C, after treating spheroidizing reacion, immediately at ferrum liquid
Collection swelling perlite powder is spread on surface, is 500-600W at power, and frequency is ultrasonic vibration 20-30mim under conditions of 30-40kHz,
And scratch clean the scum silica frost on ferrum liquid surface, and stand 10-15min, then sampling produces chill block analysis, after detection nodularization is qualified
Pour into a mould；
Before cast, nodularization bag and bag being baked to 780-840 DEG C, pouring temperature controls at 1440-1460 DEG C, poring rate control
System is at 0.4-0.6kg/s；
(4) foundry goods to moulding by casting carries out heat treatment: first with the ramp of 60-80 DEG C/h to 540-580 DEG C, be incubated 4-
6h, then with the ramp of 50-70 DEG C/h to 920-960 DEG C, it is incubated 2-4h；Then Cooling Quenching in 0-80 DEG C of cold oil is put into,
Cooling 5-20s；Last microwave heating 3-4h under conditions of power is 300-400W, then under conditions of power is 700-800W
Microwave heating 1-2h, air cooling of coming out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610681042.5A CN106148811A (en) | 2016-08-18 | 2016-08-18 | A kind of automobile gas exhausting manifold branch high temperature resistant nodular cast iron part and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610681042.5A CN106148811A (en) | 2016-08-18 | 2016-08-18 | A kind of automobile gas exhausting manifold branch high temperature resistant nodular cast iron part and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107236896A (en) * | 2017-06-30 | 2017-10-10 | 马鞍山市兴隆铸造有限公司 | A kind of casting method of mortar pump pump body cast |
| CN107747067A (en) * | 2017-10-23 | 2018-03-02 | 宁国市正兴耐磨材料有限公司 | A kind of corrosion resistant low-chromium wear-resistant ball and its casting method |
| CN110777292A (en) * | 2019-10-22 | 2020-02-11 | 山东力得汽车科技股份有限公司 | Production method for performing tip passivation on flake graphite of flake graphite cast iron |
Citations (3)
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| CN101851722A (en) * | 2009-04-01 | 2010-10-06 | 西峡县西泵特种铸造有限公司 | Formula of high silicon molybdenum ductile iron exhaust manifold and preparation method thereof |
| CN102888551A (en) * | 2012-10-30 | 2013-01-23 | 齐齐哈尔市精铸良铸造有限责任公司 | High-temperature-resistant antioxidant exhaust manifold nodular cast iron and preparation method thereof |
| CN103820700A (en) * | 2014-01-30 | 2014-05-28 | 南车戚墅堰机车车辆工艺研究所有限公司 | Heat-resisting spheroidal graphite cast iron and preparation method thereof |
-
2016
- 2016-08-18 CN CN201610681042.5A patent/CN106148811A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101851722A (en) * | 2009-04-01 | 2010-10-06 | 西峡县西泵特种铸造有限公司 | Formula of high silicon molybdenum ductile iron exhaust manifold and preparation method thereof |
| CN102888551A (en) * | 2012-10-30 | 2013-01-23 | 齐齐哈尔市精铸良铸造有限责任公司 | High-temperature-resistant antioxidant exhaust manifold nodular cast iron and preparation method thereof |
| CN103820700A (en) * | 2014-01-30 | 2014-05-28 | 南车戚墅堰机车车辆工艺研究所有限公司 | Heat-resisting spheroidal graphite cast iron and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107236896A (en) * | 2017-06-30 | 2017-10-10 | 马鞍山市兴隆铸造有限公司 | A kind of casting method of mortar pump pump body cast |
| CN107747067A (en) * | 2017-10-23 | 2018-03-02 | 宁国市正兴耐磨材料有限公司 | A kind of corrosion resistant low-chromium wear-resistant ball and its casting method |
| CN110777292A (en) * | 2019-10-22 | 2020-02-11 | 山东力得汽车科技股份有限公司 | Production method for performing tip passivation on flake graphite of flake graphite cast iron |
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Application publication date: 20161123 |
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