CN105543725A - Composite stainless steel strip for vehicle exhaust pipe and production process thereof - Google Patents
Composite stainless steel strip for vehicle exhaust pipe and production process thereof Download PDFInfo
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- CN105543725A CN105543725A CN201510983502.5A CN201510983502A CN105543725A CN 105543725 A CN105543725 A CN 105543725A CN 201510983502 A CN201510983502 A CN 201510983502A CN 105543725 A CN105543725 A CN 105543725A
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- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- 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
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention discloses a composite stainless steel strip for a vehicle exhaust pipe and a production process thereof. The composite stainless steel strip is prepared by the following raw materials in parts by weight: 33-45 parts of stainless steel, 15-30 parts of zinc, 5-10 parts of aluminum, 3.5-8 parts of magnesium, 2-3 parts of silicon, 1-5 parts of manganese, 11-15 parts of nickel, 0.2-0.3 part of beryllium, 0.5-0.8 part of chromium, 0.2-0.5 part of zirconium, 0.4-0.9 part of beryllium, 1-4 parts of lead, 2-4 parts of tin, and the balance of iron and inevitable impurities. The components and structure of steel for the vehicle exhaust pipe are designed according to the use working conditions of high-temperature resistance and corrosion resistance and the process requirements of stainless steel formation machining, so that the stainless steel is excellent in high-temperature resistance and intergranular corrosion resistance, and has the characteristics of excellent formability, corrosion resistance, high-temperature resistance, oxidation resistance, excellent deep drawing performance, smooth exhaust, no pollution, energy conservation, environmental protection, cost reduction and prolonging of service life.
Description
Technical field
The present invention relates to vapor pipe field, be specifically related to the effective Composite Stainless Steel Strip of a kind of auto exhaust and production technique thereof.
Background technology
Automobile exhaust pipe is in automobile rear end, and residing operating ambient temperature is very high, and require very high to thermotolerance, shock resistance and erosion resistance, these components are manufactured by steel plate by means of press working, therefore require that mother metal steel plate has pressure forming.On the other hand, the envrionment temperature of use also improves year by year, is necessary the addition of the alloying elements such as increase Cr, Mo, Nb and improves hot strength, oxidation-resistance and thermal fatigue characteristics etc.When Addition ofelements increases, adopt simple manufacture method that the processibility of mother metal steel plate just can be made to reduce, therefore usually can not carry out pressure forming.
The index of processibility has ductility and deep drawability etc., but in the processing of vapor pipe, important having becomes elongation and the r value of basic index.In the production process of current internal sheet metal due to deformation rate during finish rolling and technique passage grasp bad, straightening tension force, speed are improper, cause thickness and precision not high, template poor quality.Cause during automobile exhaust pipe tubulation and often occur the situation such as crackle and stammerer.In the raising of r value, it is effective for strengthening cold rolling draft, but, above-mentioned component by thicker material (about 1.5 ~ 2mm) as mother metal, so in the existing manufacturing process limited to a certain degree at the thickness of cold rolling mother metal, can not fully guarantee cold rolling draft.
In order to address this problem, composition and manufacture method descend many time, to make r value be improved without detriment to hot properties.
In the prior art, CN102107209 discloses a kind of manufacturing method of stainless steel band for automobile exhaust pipe, but it mainly relates to the improvement to rolling technology, the material adopted is still the existing stainless steel trade mark 304 stainless steel, and the problems referred to above caused due to 304 stainless compositions do not obtain basic overcoming.
Unexamined Patent 9-279312 publication has disclosed following technology, namely the above-mentioned plasticity being used as the ferrite series stainless steel plate of high temperature steel is improved by composition adjustment, if just like this, then for the thickening material that cold rolling draft is lower, there is the problems such as punching press crackle.
JP 2002-30346 publication defines hot fine rolling and starts temperature, finishing temperature, and according to the best hot-roll annealing temperature that the relation between Nb content and hot-roll annealing temperature is determined, but especially, due to the impact of other element (C, N, Cr, Mo etc.) relevant with Nb system precipitate, if just like this, then usually sufficient processibility can not be obtained.In addition, Unexamined Patent 8-199235 publication discloses the method for hot-rolled sheet being carried out the ageing treatment of 1 ~ 30 hour in the scope of 650 ~ 900 DEG C.This is the technological thought promoting recrystallize before cold rolling by making Nb precipitate separate out, even if but use the method, also usually can not obtain sufficient processibility, there is the problem that production efficiency significantly declines.
Summary of the invention
For solving the problem, the invention provides the effective Composite Stainless Steel Strip of a kind of auto exhaust and production technique thereof.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of effective Composite Stainless Steel Strip of auto exhaust and production technique thereof, comprise and being prepared from by the raw material of following weight part:
Stainless steel 33 ~ 45 parts, 15 ~ 30 parts, zinc, 5 ~ 10 parts, aluminium, 3.5 ~ 8 parts, magnesium, silicon 2 ~ 3 parts, 1 ~ 5 part, manganese, 11 ~ 15 parts, nickel, beryllium 0.2 ~ 0.3 part, chromium 0.5 ~ 0.8 part, zirconium 0.2 ~ 0.5 part, beryllium 0.4 ~ 0.9 part, 1 ~ 4 part, lead, 2 ~ 4 parts, tin, surplus are iron and inevitable impurity.
Further, comprise the steps:
S1: take stainless steel 33 ~ 45 parts, 15 ~ 30 parts, zinc, 5 ~ 10 parts, aluminium, 3.5 ~ 8 parts, magnesium, silicon 2 ~ 3 parts, 1 ~ 5 part, manganese, 11 ~ 15 parts, nickel, beryllium 0.2 ~ 0.3 part, chromium 0.5 ~ 0.8 part, zirconium 0.2 ~ 0.5 part, beryllium 0.4 ~ 0.9 part, plumbous 1 ~ 4 part, 2 ~ 4 parts, tin, surplus be that iron and inevitable impurity join in smelting furnace and enters melting, obtains stainless steel hybrid metal liquid;
S2: the stainless steel hybrid metal liquid obtained in step S1 is poured in continuous casting installation for casting, obtained stainless steel materials;
S3, step S2 is obtained stainless steel materials carry out hot rolling through finishing mill, pressure rolling becomes Stainless Steel Band;
S4, by annealed for the Stainless Steel Band of step S3 gained process, carry out acid-water washing operation afterwards;
S5, the Stainless Steel Band after acid-water washing is added cupric electrolysis by electroplating machine carry out two-sided copper facing operation, then carry out being rolled into tubulose 2-3 time through roller press; Obtain stainless steel vapor pipe finished product.
Further, in described step S1, smelting temperature is 1100 ~ 1500 DEG C, and soaking time is 1 ~ 2 hour.
Further, in described step S2, casting temperature is 800 ~ 1000 DEG C.
Further, in described step S3, final rolling temperature is 600 DEG C ~ 800 DEG C, and the time is 0.5 ~ 1h.
Further, in described step S4 acid-water washing, the concentration of pickle solution is between 3 ~ 8 degree.
Further, in described step S4 acid-water washing, annealing temperature is 1060 ~ 1080 DEG C.
Beneficial effect of the present invention: need high temperature resistant and corrosion resistant applying working condition according to the effective steel of auto exhaust, and the processing requirement of stainless steel forming process devises composition and the tissue of steel, added by the appropriate proportioning of Cr, Ti and Cu and make stainless high temperature resistant and intergranular corrosion resistance performance excellence; By adding suitable Nb, and the processing parameter of controlled working process, thus the amount of precipitation of control Nb compound, make stainless elongation and r value meet processing request, thus make stainless processing characteristics good, meet the processing request of automobile exhaust pipe; There is excellent formability, solidity to corrosion, high temperature resistant, anti-oxidant good deep drawing quality, smooth in exhaust, pollution-free, energy-conserving and environment-protective, the characteristic that reduces costs, increase the service life, in current automotive material today to lightweight, energy-saving and environmental protection future development, there is wide development space.
Embodiment
In order to make objects and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present invention includes and be prepared from by the raw material of following weight part: be prepared from by the raw material of following weight part:
Stainless steel 33 ~ 45 parts, 15 ~ 30 parts, zinc, 5 ~ 10 parts, aluminium, 3.5 ~ 8 parts, magnesium, silicon 2 ~ 3 parts, 1 ~ 5 part, manganese, 11 ~ 15 parts, nickel, beryllium 0.2 ~ 0.3 part, chromium 0.5 ~ 0.8 part, zirconium 0.2 ~ 0.5 part, beryllium 0.4 ~ 0.9 part, 1 ~ 4 part, lead, 2 ~ 4 parts, tin, surplus are iron and inevitable impurity.
A kind of effective Composite Stainless Steel Strip of auto exhaust and production technique thereof, comprise the steps:
S1: take stainless steel 33 ~ 45 parts, 15 ~ 30 parts, zinc, 5 ~ 10 parts, aluminium, 3.5 ~ 8 parts, magnesium, silicon 2 ~ 3 parts, 1 ~ 5 part, manganese, 11 ~ 15 parts, nickel, beryllium 0.2 ~ 0.3 part, chromium 0.5 ~ 0.8 part, zirconium 0.2 ~ 0.5 part, beryllium 0.4 ~ 0.9 part, plumbous 1 ~ 4 part, 2 ~ 4 parts, tin, surplus be that iron and inevitable impurity join in smelting furnace and enters melting, obtains stainless steel hybrid metal liquid;
S2: the stainless steel hybrid metal liquid obtained in step S1 is poured in continuous casting installation for casting, obtained stainless steel materials;
S3, step S2 is obtained stainless steel materials carry out hot rolling through finishing mill, pressure rolling becomes Stainless Steel Band;
S4, by annealed for the Stainless Steel Band of step S3 gained process, carry out acid-water washing operation afterwards;
S5, the Stainless Steel Band after acid-water washing is added cupric electrolysis by electroplating machine carry out two-sided copper facing operation, then carry out being rolled into tubulose 2-3 time through roller press; Obtain stainless steel vapor pipe finished product.
In described step S1, smelting temperature is 1100 ~ 1500 DEG C, and soaking time is 1 ~ 2 hour.
In described step S2, casting temperature is 800 ~ 1000 DEG C.
In described step S3, final rolling temperature is 600 DEG C ~ 800 DEG C, and the time is 0.5 ~ 1h.
In described step S4 acid-water washing, the concentration of pickle solution is between 3 ~ 8 degree.
In described step S4 acid-water washing, annealing temperature is 1060 ~ 1080 DEG C.
embodiment 1:
S1: take stainless steel 39 parts, 16 parts, zinc, 9 parts, aluminium, 3.5 parts, magnesium, silicon 3 parts, 5 parts, manganese, 15 parts, nickel, beryllium 0.25 part, chromium 0.8 part, zirconium 0.5 part, beryllium 0.9 part, plumbous 4 parts, 4 parts, tin, surplus be that iron and inevitable impurity join in smelting furnace and enters melting, obtains stainless steel hybrid metal liquid;
S2: the stainless steel hybrid metal liquid obtained in step S1 is poured in continuous casting installation for casting, obtained stainless steel materials;
S3, step S2 is obtained stainless steel materials carry out hot rolling through finishing mill, pressure rolling becomes Stainless Steel Band;
S4, by annealed for the Stainless Steel Band of step S3 gained process, carry out acid-water washing operation afterwards;
S5, the Stainless Steel Band after acid-water washing is added cupric electrolysis by electroplating machine carry out two-sided copper facing operation, then carry out being rolled into tubulose 2-3 time through roller press; Obtain stainless steel vapor pipe finished product.
In described step S1, smelting temperature is 1400 DEG C, and soaking time is 1 hour.
In described step S2, casting temperature is 900 DEG C.
In described step S3, final rolling temperature is 600 DEG C, and the time is 0.5h.
In described step S4 acid-water washing, the concentration of pickle solution is between 7 degree.
In described step S4 acid-water washing, annealing temperature is 170 DEG C.
embodiment 2:
S1: take stainless steel 45 parts, 30 parts, zinc, 10 parts, aluminium, 8 parts, magnesium, silicon 3 parts, 5 parts, manganese, 15 parts, nickel, beryllium 0.3 part, chromium 0.8 part, zirconium 0.5 part, beryllium 0.9 part, plumbous 4 parts, 4 parts, tin, surplus be that iron and inevitable impurity join in smelting furnace and enters melting, obtains stainless steel hybrid metal liquid;
S2: the stainless steel hybrid metal liquid obtained in step S1 is poured in continuous casting installation for casting, obtained stainless steel materials;
S3, step S2 is obtained stainless steel materials carry out hot rolling through finishing mill, pressure rolling becomes Stainless Steel Band;
S4, by annealed for the Stainless Steel Band of step S3 gained process, carry out acid-water washing operation afterwards;
S5, the Stainless Steel Band after acid-water washing is added cupric electrolysis by electroplating machine carry out two-sided copper facing operation, then carry out being rolled into tubulose 2-3 time through roller press; Obtain stainless steel vapor pipe finished product.
In described step S1, smelting temperature is 1500 DEG C, and soaking time is 2 hours.
In described step S2, casting temperature is 1000 DEG C.
In described step S3, final rolling temperature is 800 DEG C, and the time is 1h.
In described step S4 acid-water washing, the concentration of pickle solution is between 8 degree.
In described step S4 acid-water washing, annealing temperature is 1080 DEG C.
embodiment 3:
S1: take stainless steel 33 parts, 15 parts, zinc, 5 parts, aluminium, 3.5 parts, magnesium, silicon 2 parts, 1 part, manganese, 11 parts, nickel, beryllium 0.2 part, chromium 0.5 part, zirconium 0.2 part, beryllium 0.4 part, plumbous 1 part, 2 parts, tin, surplus be that iron and inevitable impurity join in smelting furnace and enters melting, obtains stainless steel hybrid metal liquid;
S2: the stainless steel hybrid metal liquid obtained in step S1 is poured in continuous casting installation for casting, obtained stainless steel materials;
S3, step S2 is obtained stainless steel materials carry out hot rolling through finishing mill, pressure rolling becomes Stainless Steel Band;
S4, by annealed for the Stainless Steel Band of step S3 gained process, carry out acid-water washing operation afterwards;
S5, the Stainless Steel Band after acid-water washing is added cupric electrolysis by electroplating machine carry out two-sided copper facing operation, then carry out being rolled into tubulose 2-3 time through roller press; Obtain stainless steel vapor pipe finished product.
In described step S1, smelting temperature is 1100 DEG C, and soaking time is 1 hour.
In described step S2, casting temperature is 800 DEG C.
In described step S3, final rolling temperature is 600 DEG C, and the time is 0.5h.
In described step S4 acid-water washing, the concentration of pickle solution is between 3 degree.
In described step S4 acid-water washing, annealing temperature is 1060 DEG C.
Beneficial effect of the present invention: bright according to the high temperature resistant and corrosion resistant applying working condition of auto exhaust effective steel needs, and the processing requirement of stainless steel forming process devises composition and the tissue of steel, added by the appropriate proportioning of Cr, Mo, Ti and Cu and make stainless high temperature resistant and intergranular corrosion resistance performance excellence; By adding suitable Nb, and the processing parameter of controlled working process, thus the amount of precipitation of control Nb compound, make stainless elongation and r value meet processing request, thus make stainless processing characteristics good, meet the processing request of automobile exhaust pipe; There is excellent formability, solidity to corrosion, high temperature resistant, anti-oxidant good deep drawing quality, smooth in exhaust, pollution-free, energy-conserving and environment-protective, the characteristic that reduces costs, increase the service life, in current automotive material today to lightweight, energy-saving and environmental protection future development, there is wide development space.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. the effective Composite Stainless Steel Strip of auto exhaust, is characterized in that, comprises and being prepared from by the raw material of following weight part:
Stainless steel 33 ~ 45 parts, 15 ~ 30 parts, zinc, 5 ~ 10 parts, aluminium, 3.5 ~ 8 parts, magnesium, silicon 2 ~ 3 parts, 1 ~ 5 part, manganese, 11 ~ 15 parts, nickel, beryllium 0.2 ~ 0.3 part, chromium 0.5 ~ 0.8 part, zirconium 0.2 ~ 0.5 part, beryllium 0.4 ~ 0.9 part, 1 ~ 4 part, lead, 2 ~ 4 parts, tin, surplus are iron and inevitable impurity.
2. the effective Composite Stainless Steel Strip of auto exhaust and a production technique thereof, is characterized in that, comprise the steps:
S1: take stainless steel 33 ~ 45 parts, 15 ~ 30 parts, zinc, 5 ~ 10 parts, aluminium, 3.5 ~ 8 parts, magnesium, silicon 2 ~ 3 parts, 1 ~ 5 part, manganese, 11 ~ 15 parts, nickel, beryllium 0.2 ~ 0.3 part, chromium 0.5 ~ 0.8 part, zirconium 0.2 ~ 0.5 part, beryllium 0.4 ~ 0.9 part, plumbous 1 ~ 4 part, 2 ~ 4 parts, tin, surplus be that iron and inevitable impurity join in smelting furnace and enters melting, obtains stainless steel hybrid metal liquid;
S2: the stainless steel hybrid metal liquid obtained in step S1 is poured in continuous casting installation for casting, obtained stainless steel materials;
S3, step S2 is obtained stainless steel materials carry out hot rolling through finishing mill, pressure rolling becomes Stainless Steel Band;
S4, by annealed for the Stainless Steel Band of step S3 gained process, carry out acid-water washing operation afterwards;
S5, the Stainless Steel Band after acid-water washing is added cupric electrolysis by electroplating machine carry out two-sided copper facing operation, then carry out being rolled into tubulose 2-3 time through roller press; Obtain stainless steel vapor pipe finished product.
3. the effective Composite Stainless Steel Strip of a kind of auto exhaust according to claim 2 and production technique thereof, is characterized in that, in described step S1, smelting temperature is 1100 ~ 1500 DEG C, and soaking time is 1 ~ 2 hour.
4. the effective Composite Stainless Steel Strip of a kind of auto exhaust according to claim 2 and production technique thereof, is characterized in that, in described step S2, casting temperature is 800 ~ 1000 DEG C.
5. the effective Composite Stainless Steel Strip of a kind of auto exhaust according to claim 2 and production technique thereof, is characterized in that, in described step S3, final rolling temperature is 600 DEG C ~ 800 DEG C, and the time is 0.5 ~ 1h.
6. the effective Composite Stainless Steel Strip of a kind of auto exhaust according to claim 2 and production technique thereof, is characterized in that, in described step S4 acid-water washing, the concentration of pickle solution is between 3 ~ 8 degree.
7. the effective Composite Stainless Steel Strip of a kind of auto exhaust according to claim 2 and production technique thereof, is characterized in that, in described step S4 acid-water washing, annealing temperature is 1060 ~ 1080 DEG C.
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| CN201510983502.5A CN105543725A (en) | 2015-12-24 | 2015-12-24 | Composite stainless steel strip for vehicle exhaust pipe and production process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106191626A (en) * | 2016-07-13 | 2016-12-07 | 安徽奥丰汽车配件有限公司 | A kind of automobile exhaust pipe special metals material and preparation method thereof |
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| CN104160054A (en) * | 2012-03-09 | 2014-11-19 | 新日铁住金不锈钢株式会社 | Ferritic stainless steel sheet |
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| CN103534377A (en) * | 2011-05-16 | 2014-01-22 | 新日铁住金不锈钢株式会社 | Martensitic stainless steel plate for bicycle disc brake rotor and manufacturing method therefor |
| CN103608479A (en) * | 2011-06-16 | 2014-02-26 | 新日铁住金不锈钢株式会社 | Ferritic stainless-steel sheet with excellent non-ridging property and process for producing same |
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| CN106191626A (en) * | 2016-07-13 | 2016-12-07 | 安徽奥丰汽车配件有限公司 | A kind of automobile exhaust pipe special metals material and preparation method thereof |
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Application publication date: 20160504 |
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