CN104878315A - Automobile engine exhaust pipe and processing method thereof - Google Patents
Automobile engine exhaust pipe and processing method thereof Download PDFInfo
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- CN104878315A CN104878315A CN201510291625.2A CN201510291625A CN104878315A CN 104878315 A CN104878315 A CN 104878315A CN 201510291625 A CN201510291625 A CN 201510291625A CN 104878315 A CN104878315 A CN 104878315A
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- iron
- exhaust pipe
- engine exhaust
- nickel
- automobile engine
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Abstract
The invention provides an automobile engine exhaust pipe and a processing method thereof. The automobile engine exhaust pipe comprises, by mass, 1.5-2% of carbon, 1.3-1.5% of silicon, 15-40% of nickel, 0.03-0.05% of manganese, 1.2-2.0% of chromium, vanadium, the balance iron and inevitable impurities. The processing method includes (1), weighing the carbon, the silicon, the nickel, the manganese, the chromium, the vanadium and the iron according to the above mass ratio for standby; (2), melting, namely, adding the iron into a medium-frequency induction furnace, powering on the medium-frequency induction furnace to melt to form a molten pool prior to adding the nickel, and adding other alloys for melting; (3), spheroidizing molten iron by 1.2-1.8% of spheroidizing agent at the temperature of 1630-1680 DEG C, wherein an Ni-Mg alloy with the Mg content of 18-20% is selected as the spheroidizing agent; (4) pouring, namely, after spheroidizing is completed, transferring alloy liquid to a pouring site by a spheroidizing laddle for casting pouring at the temperature of 1420-1460 DEG C. The automobile engine exhaust pipe is high in heat resistance and low in cost.
Description
technical field:
The present invention relates to a kind of automobile engine exhaust pipe and working method thereof, belong to technical field of automobile.
background technology:
Along with the continuous lifting of motor car engine performance, require more and more higher to the use properties of the exhaust pipe of engine, high-Ni-Cr cast iron is as relatively more conventional heat resistant engines vapor pipe, existing high-Ni-Cr cast iron nodulizing agent all adopts low rare-earth nodularizer to carry out spheroidizing, namely add-on is 1.6%, breed and namely adopt 75SiFe, add-on is 0.8%.Owing to there is higher Mn, Cr alloy content, in matrix, there is carbide tissue along grain boundaries.Nodularization situation is unstable, and supercooled graphite or the vermiform decline graphite of a large amount of dendrite point-like appear in metallographic structure, and Oxygen potential is low, severe exacerbation coupon mechanical property.Existing high-Ni-Cr cast iron cost is also higher in addition.
summary of the invention:
The object of the invention is to provide a kind of automobile engine exhaust pipe and working method thereof for above-mentioned Problems existing, its resistance toheat is good and cost is low.
Above-mentioned object is achieved through the following technical solutions:
Automobile engine exhaust pipe, composition comprises according to the mass fraction: carbon, 1.5-2%; Silicon, 1.3-1.5%; Nickel, 15-40%; Manganese, 0.03-0.05%; Chromium 1.2-2.0%; All the other are iron and inevitable impurity.
Automobile engine exhaust pipe, composition comprises according to the mass fraction: carbon, 1.6-1.9%; Silicon, 1.35-1.45%; Nickel, 18-36%; Manganese, 0.035-0.045%; Chromium 1.3-1.8%; All the other are iron and inevitable impurity.
Automobile engine exhaust pipe, composition comprises according to the mass fraction: carbon, 1.7-1.8%; Silicon, 1.38-1.42%; Nickel, 20-32%; Manganese, 0.038-0.042%; Chromium 1.5-1.7%; All the other are iron and inevitable impurity.
Automobile engine exhaust pipe, composition comprises according to the mass fraction: carbon, 1.75%; Silicon, 1.40%; Nickel, 26%; Manganese, 0.04%; Chromium 1.6%; All the other are iron and inevitable impurity.
The working method of above-mentioned automobile engine exhaust pipe, the method comprises the steps:
(1) proportioning raw materials: carbon, silicon, nickel, manganese, chromium, vanadium, iron are weighed up for subsequent use by above-mentioned part by weight;
(2) melt: in medium-frequency induction furnace, first add iron, carry out adding nickel again after fusing forms molten bath in power transmission, finally add other alloy and carry out melting;
(3) spheroidizing: nodulizing agent select Mg content 18% ~ 20% Ni-Mg alloy, additional proportion is 1.2%-1.8%, and the spheroidization treatment temperature of molten iron selects 1630 DEG C ~ 1680 DEG C;
(4) pour into a mould: after spheroidizing terminates, aluminium alloy spheroidizing bag is transported to cast scene and carries out casting pouring, teeming temperature selects 1420 DEG C ~ 1460 DEG C to pour into a mould.
Beneficial effect:
The automobile engine exhaust pipe that the present invention produces, its resistance toheat is good and cost is low.
embodiment:
Embodiment 1:
Automobile engine exhaust pipe, composition comprises according to the mass fraction: carbon, 1.5%; Silicon, 1.3%; Nickel, 40%; Manganese, 0.05%; Chromium 1.2%; All the other are iron and inevitable impurity.
The working method of above-mentioned automobile engine exhaust pipe, the method comprises the steps:
(1) proportioning raw materials: carbon, silicon, nickel, manganese, chromium, vanadium, iron are weighed up for subsequent use by above-mentioned part by weight;
(2) melt: in medium-frequency induction furnace, first add iron, carry out adding nickel again after fusing forms molten bath in power transmission, finally add other alloy and carry out melting;
(3) spheroidizing: nodulizing agent select Mg content 18% ~ 20% Ni-Mg alloy, additional proportion is 1.2%-1.8%, and the spheroidization treatment temperature of molten iron selects 1630 DEG C ~ 1680 DEG C;
(4) pour into a mould: after spheroidizing terminates, aluminium alloy spheroidizing bag is transported to cast scene and carries out casting pouring, teeming temperature selects 1420 DEG C ~ 1460 DEG C to pour into a mould.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is: the automobile engine exhaust pipe in the present embodiment, and composition comprises according to the mass fraction: carbon, 2%; Silicon, 1.5%; Nickel, 15%; Manganese, 0.03%; Chromium 2.0%; All the other are iron and inevitable impurity.
Embodiment 3:
The difference of the present embodiment and embodiment 1 is: automobile engine exhaust pipe in the present embodiment, and composition comprises according to the mass fraction: carbon, 1.6%; Silicon, 1.35%; Nickel, 36%; Manganese, 0.045%; Chromium 1.3%; All the other are iron and inevitable impurity.
Embodiment 4:
The difference of the present embodiment and embodiment 1 is: automobile engine exhaust pipe in the present embodiment, and composition comprises according to the mass fraction: carbon, 1.9%; Silicon, 1.45%; Nickel, 18%; Manganese, 0.035%; Chromium 1.8%; All the other are iron and inevitable impurity.
Embodiment 5:
The difference of the present embodiment and embodiment 1 is: automobile engine exhaust pipe in the present embodiment, and composition comprises according to the mass fraction: carbon, 1.8%; Silicon, 1.38%; Nickel, 32%; Manganese, 0.038%; Chromium 1.7%; All the other are iron and inevitable impurity.
Embodiment 6:
The difference of the present embodiment and embodiment 1 is: automobile engine exhaust pipe in the present embodiment, and composition comprises according to the mass fraction: carbon, 1.7%; Silicon, 1.42%; Nickel, 20%; Manganese, 0.042%; Chromium 1.5%; All the other are iron and inevitable impurity.
Embodiment 7:
The difference of the present embodiment and embodiment 1 is: automobile engine exhaust pipe in the present embodiment, and composition comprises according to the mass fraction: carbon, 1.75%; Silicon, 1.40%; Nickel, 26%; Manganese, 0.04%; Chromium 1.6%; All the other are iron and inevitable impurity.
Below be only most preferred embodiment of the present invention, method of the present invention includes but not limited to above-described embodiment, and unaccomplished matter of the present invention belongs to the common practise of those skilled in the art.
Claims (5)
1. an automobile engine exhaust pipe, is characterized in that: composition comprises according to the mass fraction: carbon, 1.5-2%; Silicon, 1.3-1.5%; Nickel, 15-40%; Manganese, 0.03-0.05%; Chromium 1.2-2.0%; All the other are iron and inevitable impurity.
2. according to claim 1 automobile engine exhaust pipe, it is characterized in that: composition comprises according to the mass fraction: carbon, 1.6-1.9%; Silicon, 1.35-1.45%; Nickel, 18-36%; Manganese, 0.035-0.045%; Chromium 1.3-1.8%; All the other are iron and inevitable impurity.
3. according to claim 1 automobile engine exhaust pipe, it is characterized in that: composition comprises according to the mass fraction: carbon, 1.7-1.8%; Silicon, 1.38-1.42%; Nickel, 20-32%; Manganese, 0.038-0.042%; Chromium 1.5-1.7%; All the other are iron and inevitable impurity.
4. according to claim 1 automobile engine exhaust pipe, it is characterized in that: composition comprises according to the mass fraction: carbon, 1.75%; Silicon, 1.40%; Nickel, 26%; Manganese, 0.04%; Chromium 1.6%; All the other are iron and inevitable impurity.
5. a working method for above-mentioned automobile engine exhaust pipe, is characterized in that: the method comprises the steps:
(1) proportioning raw materials: carbon, silicon, nickel, manganese, chromium, vanadium, iron are weighed up for subsequent use by above-mentioned part by weight;
(2) melt: in medium-frequency induction furnace, first add iron, carry out adding nickel again after fusing forms molten bath in power transmission, finally add other alloy and carry out melting;
(3) spheroidizing: nodulizing agent select Mg content 18% ~ 20% Ni-Mg alloy, additional proportion is 1.2%-1.8%, and the spheroidization treatment temperature of molten iron selects 1630 DEG C ~ 1680 DEG C;
(4) pour into a mould: after spheroidizing terminates, aluminium alloy spheroidizing bag is transported to cast scene and carries out casting pouring, teeming temperature selects 1420 DEG C ~ 1460 DEG C to pour into a mould.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510291625.2A CN104878315A (en) | 2015-06-01 | 2015-06-01 | Automobile engine exhaust pipe and processing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510291625.2A CN104878315A (en) | 2015-06-01 | 2015-06-01 | Automobile engine exhaust pipe and processing method thereof |
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| CN104878315A true CN104878315A (en) | 2015-09-02 |
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| CN201510291625.2A Pending CN104878315A (en) | 2015-06-01 | 2015-06-01 | Automobile engine exhaust pipe and processing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105463303A (en) * | 2015-12-31 | 2016-04-06 | 芜湖恒耀汽车零部件有限公司 | Low-cost automotive exhaust pipe and manufacturing technology thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1927505A (en) * | 2006-09-26 | 2007-03-14 | 西峡县西泵特种铸造有限公司 | High nickel austenite spheroidal graphite cast iron automobile exhaust branch pipe and casting method |
| CN101403068A (en) * | 2008-11-06 | 2009-04-08 | 徐宏亮 | Austenite spheroidal iron and producing method thereof |
| CN103266262A (en) * | 2013-04-25 | 2013-08-28 | 中国石油天然气股份有限公司 | High-nickel ductile iron used at low-temperature and casting method thereof |
-
2015
- 2015-06-01 CN CN201510291625.2A patent/CN104878315A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1927505A (en) * | 2006-09-26 | 2007-03-14 | 西峡县西泵特种铸造有限公司 | High nickel austenite spheroidal graphite cast iron automobile exhaust branch pipe and casting method |
| CN101403068A (en) * | 2008-11-06 | 2009-04-08 | 徐宏亮 | Austenite spheroidal iron and producing method thereof |
| CN103266262A (en) * | 2013-04-25 | 2013-08-28 | 中国石油天然气股份有限公司 | High-nickel ductile iron used at low-temperature and casting method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 廉贞松: "汽车排气歧管用合金球铁的组织和性能", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105463303A (en) * | 2015-12-31 | 2016-04-06 | 芜湖恒耀汽车零部件有限公司 | Low-cost automotive exhaust pipe and manufacturing technology thereof |
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Application publication date: 20150902 |