CN106939392A - A kind of material for being used to cast automobile gas exhausting manifold branch - Google Patents
A kind of material for being used to cast automobile gas exhausting manifold branch Download PDFInfo
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- CN106939392A CN106939392A CN201710217975.3A CN201710217975A CN106939392A CN 106939392 A CN106939392 A CN 106939392A CN 201710217975 A CN201710217975 A CN 201710217975A CN 106939392 A CN106939392 A CN 106939392A
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- 239000000463 material Substances 0.000 title claims abstract description 43
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 15
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000010955 niobium Substances 0.000 description 19
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- 239000011651 chromium Substances 0.000 description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 13
- 229910001566 austenite Inorganic materials 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 208000025599 Heat Stress disease Diseases 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 150000001722 carbon compounds Chemical class 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Supercharger (AREA)
Abstract
The present invention discloses a kind of material for being used to cast automobile gas exhausting manifold branch, by weight percentage, consists of the following composition：C 0.30~0.50%, Si 1.0~2.5%, Mn≤2.0%, P≤0.04%, S≤0.03%, Cr 24.0~27.0%, Ni 10.0~11.5%, Mo≤0.5%, W≤0.60%, Nb 0.6~0.8%, V≤0.12, Cu≤0.25%, surplus is Fe.The material is up to 1100 DEG C of environment suitable for temperature, with good resistance to elevated temperatures.The nickelic material castings of D5S can be substituted and make exhaust manifold, while reducing production cost.
Description
Technical field
The present invention relates to a kind of material for being used to cast automobile turbocharger sub-unit exhaust manifold.
Background technology
With the progress and the application of technology for Turbocharger Manufacturing of engine technology, the work temperature of exhaust manifold is significantly improved
Degree, the original hundreds of degree lifting of the exhausting waste gas temperature of automobile engine is to more than 1050 DEG C, automobile gas exhausting manifold branch and vapour
Car engine turbine room air inlet is joined directly together, and long-term work is under cold/hot temperature repeat state, it is desirable to make exhaust discrimination
The material of pipe has good casting character, high-temperature behavior and heat resistance, meets the performance requirement of exhaust manifold.
High-nickel austenite nodular cast iron being used current automobile turbocharger sub-unit exhaust manifold more（D5S）Material is cast
Make, maximum operating temperature is 950 DEG C, high-nickel austenite nodular cast iron（D5S）Material matrix is that austenite adds a small amount of carbon
Compound, product needs heat treatment, and Technology for Heating Processing is directly connected to size, composition and the form of carbide.Automobile engine is arranged
Gas manifold works under oxidizing gas, surge and alternating hot and cold cycling condition, with bolt by exhaust manifold and adjacent parts
Fasten and suffer restraints, it is impossible to which free wxpansion and contraction, metallographic structure have excessive carbide, material fragility can be increased, led
Cause product local brittle larger, produce structural stress, weaken the room temperature and high-temperature behavior of matrix.D5S exhaust manifolds are high in temperature
Violent oxidation reaction can occur when more than 600 DEG C, surface forms thick more than 3mm oxide skin, under stress long term,
The thermal fatigue limit that alternating thermal stress has exceeded material is also easy to produce heat fatigue cracking failure.It can not preferably meet automobile whirlpool
Take turns the performance requirement of booster sub-unit exhaust manifold.
The content of the invention
The technical problem to be solved in the present invention is to overcome existing automobile turbocharger sub-unit exhaust manifold material therefor
Defect be used to cast the material of automobile turbocharger sub-unit automobile gas exhausting manifold branch there is provided a kind of.
In order to solve the above-mentioned technical problem, the invention provides following technical scheme：
A kind of material for being used to cast automobile gas exhausting manifold branch, by weight percentage, is consisted of the following composition：
C 0.30~0.50%, Si 1.0~2.5%, Mn≤2.0%, P≤0.04%, S≤0.03%, Cr 24.0~27.0%,
Ni 10.0~11.5%, Mo≤0.5%, W≤0.60%, Nb 0.6~0.8%, V≤0.12, Cu≤0.25%, surplus is
Fe。
Preferably, the material by weight percentage, is consisted of the following composition：
C 0.36%、Si 2.22%、Mn 1.04%、P ≤0.018%、S ≤0.023%、Cr 24.44%、Ni 11.0%、Mo
0.008%th, W 0.007%, Nb 0.78%, V 0.12%, Cu 0.034%, surplus is Fe.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and constitutes a part for specification, the reality with the present invention
Applying example is used to explain the present invention together, is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is 1.4837（1.48% Nb）The metallograph of material.
Fig. 2 is the metallograph of material after the present invention is improved.
Embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing, it will be appreciated that preferred reality described herein
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Embodiment 1
1. prepare raw material by the formula ratio of table 1
Primary raw material：Trace carbon ferrochrome, electrolytic nickel, melting niobium, useless high-quality mild steel（Thickness is more than 10mm）And return material etc., into
Point, ratio, strictly to control in shape and purity.
2. steel scrap carries out Shot Blasting, it is ensured that uses preceding non-corroding, and goes aqueous vapor by 300 DEG C of bakings.
3. charging sequence
1/2 → steel scrap of chromic carbide iron（W, V, Cu, Mo are that steel scrap is brought into）→ melting niobium → chromic carbide iron 1/2 → returns material → electrolysis
Nickel → 1/2 → blowing argon gas of slag making deoxidier decontamination → slag making deoxidier 1/2 → 75# ferrosilicon（Furnace charge dissolving latter temperature reaches
Added after being skimmed at 1560 DEG C）→ X-alloy alterant（Efficient deoxidation degassing grain refiner）→ static blowing argon gas → are before coming out of the stove
Add electrolytic manganese → tapping → cast（Argon gas is protected）.
4. ensure that molten steel is not oxidized in smelting process, bell must be covered in casting process, reduce temperature it is quick under
Drop.
The knockout 5. cast is unpacked after 15 minutes.
By substantial amounts of experimental study, determine that the chemical composition ranges of the invention are shown in Table 1.
The chemical composition of the material of table 1（Mass fraction, %, surplus is Fe）
Extracting wherein a batch of material actual measurement chemical composition is：C 0.36%、Si 2.22%、Mn 1.04%、P 0.018%、S
0.023%th, Cr 24.44%, Ni 11.0%, Mo 0.008%, W 0.007%, Nb 0.78%, V 0.12%, Cu 0.034%, surplus
For Fe.
The room-temperature mechanical property of material of the present invention is shown in Table 2.The mechanical behavior under high temperature of material of the present invention is shown in Table 3.Material of the present invention
The high temperature resistant mechanical property of material is shown in Table 4.
The room-temperature mechanical property of the material of the present invention of table 2
The mechanical behavior under high temperature of the material of the present invention of table 3（Detected by inspection center of Shanghai Inst. of Materials）
The high temperature resistant mechanical property of the material of the present invention of table 4（Detected by inspection center of Shanghai Inst. of Materials）
1.4837 materials are high-chromium-nickel steels, and its elementary organization is that corrosion resistance is stronger under austenite, high temperature, but is deposited when in steel
Ferrite former chromium, titanium, silicone content be in the upper limit or at 600~900 DEG C（649~871）DEG C slow cooling, is deposited sometimes
In a small amount of delta ferrite tissue, so that the chemical stability of steel declines, when ferritic volume fraction is more than 5% in steel,
σ phases are easily produced from ferrite, σ phases are Fe-Cr intermetallic compounds, often in Cr23C6Forming core on type carbide, with similar
Structure, the very high HC68 of hardness makes material occur fragility, is harmful to corrosion resistance.
The microscopic structure of material directly influences the performance and used life of machine components, the casting of 1.4837 heat resisting steel materials
Make turbocharger sub-unit exhaust manifold product, technical requirements metallographic structure is austenite plus carbide, carbide it is many
Less and species is not quantitative, it is necessary to which we inquire into the metallographic structure with 1.4837 material products of research using means such as Metallographic Analysis
Relation between composition and performance, optimization improves the smelting component proportioning of product, raw to guide product casting and manufacturing process
Output meets the qualified products of product technology condition and performance requirement.
Cr is most important alloying element in 1.4837 steel, the Cr of the higher formation of phosphorus content23C6Carbide is more, so as to subtract
Lack the chromium content in austenite, made uneven microstructure, reduce the heat resistance of steel, if being heated in the range of 500~750 DEG C,
Cr23C6Carbide can again be separated out on austenite grain boundary again, make its surrounding matrix formation Cr depletion zone, so that it is rotten to produce intergranular
Erosion.
In order to prevent Intergranular Corrosion of Austenitic Stainless Steel, Nb is added in steel.The affinity of Nb and carbon is than chromium and carbon
Affinity is big, and NbC carbide is initially formed in steel, and carbon is largely fixed by niobium, substitution alloy carbide Cr23C6, make shape
Into Cr23C6Possibility substantially reduce, be not enough to cause intercrystalline corrosion, to improve the intergranular corrosion resistance performance of stainless steel.Niobium portion
Divide and dissolve in solid solution, play solution strengthening effect, the quenching degree of steel is significantly improved when dissolving in austenite, it is micro- with carbide and oxide
In the presence of particle shape formula, crystal grain thinning and the quenching degree for reducing steel, trace niobium can be in the plasticity or the situation of toughness for not influenceing steel
The lower intensity for improving steel, impact flexibility simultaneously reduce its brittle transition temperature；The high-temperature behavior of refractory steel, such as creep strength can be improved
Deng.
But I haven't seen you for ages more than Nb contents reduces Cr23C6Content, makes product obtain preferable performance, by 1.4837 material Nb members
The difference of plain addition, applicant has shown that Nb contents are less than 0.6 in progress great number tested data research（Mass fraction, %）When, production
Product can produce decrepitation, and the additional proportion that Nb niobium elements are verified by lot of experiments is 0.6~0.8（Mass fraction, %）When,
Corrosion resistance is also relatively strong under room-temperature mechanical property, maximum operation (service) temperature, high temperature, and mechanical behavior under high temperature is optimal.Carbide morphology
See Fig. 1, Fig. 2.
Melting Nb is rare noble element, and price per ton is up to more than 800,000 yuan, and niobium member is reduced on the basis of 1.4837
The content of element, every product can save 16 yuan or so of cost i.e. 3% or so of product cost of content of niobium.
D5S is austenite ductile Ni-resist cast iron, and nickel content is up to more than 34%, and China is the country that a nickel resources lack,
So adding Nb contents 0.6~0.8 using 1.4837 materials（Mass fraction, %）Material substitution D5S materials, are on the one hand improved
The performance of turbocharger sub-unit exhaust manifold, while reducing the cost of product.
Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention,
Although the present invention is described in detail with reference to the foregoing embodiments, for a person skilled in the art, it still may be used
To be modified to the technical scheme described in foregoing embodiments, or to which part technical characteristic progress equivalent.
Within the spirit and principles of the invention, any modifications, equivalent substitutions and improvements made etc., should be included in the present invention's
Within protection domain.
Claims (3)
1. a kind of material for being used to cast automobile gas exhausting manifold branch, by weight percentage, is consisted of the following composition：
C 0.30~0.50%, Si 1.0~2.5%, Mn≤2.0%, P≤0.04%, S≤0.03%, Cr 24.0~27.0%,
Ni 10.0~11.5%, Mo≤0.5%, W≤0.60%, Nb 0.6~0.8%, V≤0.12, Cu≤0.25%, surplus is
Fe, surplus is Fe.
2. material according to claim 1, it is characterised in that：The material by weight percentage, by following component group
Into：
C 0.36%、Si 2.22%、Mn 1.04%、P 0.018%、S 0.023%、Cr 24.44%、Ni 11.0%、Mo 0.008%、
W 0.007%, Nb 0.78%, V 0.12%, Cu 0.034%, surplus is Fe.
3. the answering in resistant to elevated temperatures casting automobile turbocharger sub-unit exhaust manifold is made of material described in claim 1
With.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710217975.3A CN106939392A (en) | 2017-04-05 | 2017-04-05 | A kind of material for being used to cast automobile gas exhausting manifold branch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710217975.3A CN106939392A (en) | 2017-04-05 | 2017-04-05 | A kind of material for being used to cast automobile gas exhausting manifold branch |
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| CN106939392A true CN106939392A (en) | 2017-07-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107939501A (en) * | 2017-11-27 | 2018-04-20 | 绩溪县徽洋车桥有限责任公司 | A kind of material for casting exhaust manifold |
| CN108641570A (en) * | 2018-05-09 | 2018-10-12 | 苏州市大华精密机械有限公司 | The production technology of automobile manifold |
| CN110616380A (en) * | 2018-06-20 | 2019-12-27 | 无锡市东明冠特种金属制造有限公司 | Non-magnetic martensite and preparation method thereof |
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| CN107939501A (en) * | 2017-11-27 | 2018-04-20 | 绩溪县徽洋车桥有限责任公司 | A kind of material for casting exhaust manifold |
| CN108641570A (en) * | 2018-05-09 | 2018-10-12 | 苏州市大华精密机械有限公司 | The production technology of automobile manifold |
| CN110616380A (en) * | 2018-06-20 | 2019-12-27 | 无锡市东明冠特种金属制造有限公司 | Non-magnetic martensite and preparation method thereof |
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