CN103131961A - Corrosion-resistant stainless steel plate, and preparation method and application thereof - Google Patents
Corrosion-resistant stainless steel plate, and preparation method and application thereof Download PDFInfo
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- CN103131961A CN103131961A CN2013100740919A CN201310074091A CN103131961A CN 103131961 A CN103131961 A CN 103131961A CN 2013100740919 A CN2013100740919 A CN 2013100740919A CN 201310074091 A CN201310074091 A CN 201310074091A CN 103131961 A CN103131961 A CN 103131961A
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Abstract
The invention discloses a corrosion-resistant stainless steel plate, and a preparation method and application thereof. The corrosion-resistant stainless steel plate is characterized by comprising the following components in percentage by mass: at most 0.020% of C, at most 0.80% of Si, at most 1.00% of Mn, at most 0.010% of S, at most 0.030% of P, 19.50-20.50% of Cr, 17.50-18.50% of Ni, 6.50-7.00% of Mo, 0.50-1.00% of Cu, 0.22-0.30% of N, 0.10-0.15% of Re and the balance of Fe. The corrosion-resistant stainless steel has favorable corrosion resistance, mechanical properties and weldability.
Description
Technical field
The present invention relates to a kind of stainless steel, especially a kind of corrosion-resistant stainless steel plate and preparation method thereof and application.
Background technology
Usually contain SO in coal-fired plant flue gas
2, SO
3, NO
x, HCl, the sour gas such as HF, these gases directly enter atmosphere will cause serious environmental pollution, namely cause acid rain.Clearly emphasized to want strengthen environmental protection and improvement in " 18 is large " report, so the discharging of coal-fired plant flue gas will be subject to more and more stricter restriction.According to version standard in 2011, Chinese firepower electrical plant (coal firing boiler) Air Pollutant Emission limit value was: flue dust 20mg/m
3, sulfurous gas 50mg/m
3, oxynitride (NO
2) 100mg/m
3, mercury and mercuric compounds 0.03mg/m
3Coal-fired plant flue gas must pass through flue gas desulfurization (FGD---Flue Gas Desulfurization) technique can reach emission standard.Flue gas desulfurization technique has multiple, but most adopts lime-limestone wet-process technique.Usually the clean flue gas after flue gas desulphurization system absorption tower purification has the heat temperature raising discharging and does not heat direct discharging dual mode through smoke stack emission, namely adds interchanger (GGH) and does not add interchanger (GGH), and the chimney that does not generally add GGH is called wet chimney.Increasing Introduction For Flue Gas Desulfarization System Of Electric Power Plant adopts wet chimney operation, the characteristics of not establishing the FGD system of GGH are: simplified system, shortened the import and export flue, reduced investment running cost, save a large amount of maintenance works of the higher GGH of failure rate, but increased the anticorrosive work of chimney.This is to be approximately 50 ℃ of left and right because in wet chimney, the temperature of clean flue gas is low, and still contains a small amount of SO in clean flue gas
2, SO
3, NO
x, HCl, the sour gas such as HF, this moment, smoke condensation was serious, caused the dew point corrosion of chimney inner flue, was mainly the dew point corrosion of reductibility dilute sulphuric acid.In addition, the Cl that sucks in condensing droplet
-, F
-Also can cause the local corrosions such as spot corrosion, crevice corrosion.Obviously, the corrodibility of wet chimney is also very complicated very by force, China adopts non-metallic material as corrosion-proof lining mostly at present, as glass flake, acid resisting brick/clay, borosilicate glass foam block etc., minority adopts titanium material (TA2) as corrosion-proof lining, in view of China's national situation, adopt nickel-base alloy too expensive.The inherent defect of non-metallic material easily causes coming off of corrosion protective lining and the problem such as aging, and the later maintenance of nonmetal corrosion protective lining trouble, and workload is large, and life cycle cost is high; And the process for machining and manufacturing of titanium material is strict, easily causes welding flaw, can not directly weld with the chimney plain steel.
And at present on the market the corrosion-resistant of stainless material can reach the service requirements of flue gas desulphurization system.
Summary of the invention
According to the deficiencies in the prior art, the object of the present invention is to provide a kind of erosion resistance, mechanical property, corrosion-resistant stainless steel plate that welding property is good.
The present invention is for addressing the above problem, the technical scheme of taking is: a kind of corrosion-resistant stainless steel plate, by mass percentage, composed of the following components: C :≤0.020%, Si :≤0.80%, Mn :≤1.00%, S :≤0.010%, P :≤0.030%, Cr:19.50～20.50%, Ni:17.50～18.50%, Mo:6.50～7.00%, Cu:0.50～1.00%, N:0.22～0.30%, Re:0.10%～0.15%, its surplus is Fe.
A kind of corrosion-resistant stainless steel plate, by mass percentage, composed of the following components: C:0.012%, Si:0.75%, Mn:0.74%, S:0.008%, P:0.028%, Cr:19.98%, Ni:18.01%, Mo:6.56%, Cu:0.89%, N:0.25%, Re:0.12%, Fe:52.652%.
A kind of corrosion-resistant stainless steel plate the preparation method, stainless material is cold-rolled to 1.6mm thickness, then carry out solution treatment, solid solution temperature is 1150 ℃, the insulation 20min.
The anticorrosion construction method of the wet chimney lining of a kind of coal fired power plant flue gas desulfurization system take the corrosion-resistant stainless steel plate as plate, comprises following processing step:
At first a fixedly is welded in first and second block of corrosion-resistant stainless steel plate in the carbon steel substrate;
The described first block of corrosion-resistant stainless steel plate of b and second overlapping phase seal welding of corrosion-resistant stainless steel plate portion, perhaps described first block of corrosion-resistant stainless steel plate and second block of corrosion-resistant stainless steel plate are by corrosion-resistant stainless steel plate welding bar seal welding;
C so successively the corrosion-resistant stainless steel plate is fixing and seal welding until whole inner wall of stack all covered fully by the corrosion-resistant stainless steel plate.
Principle of the present invention is: chromium metal is the most basic alloying element that stainless steel obtains corrosion resistance nature, chromium thermodynamic instability but easily passivation, and chromium and ferrous alloy composition sosoloid can make ferrous alloy have the anti-corrosion characteristics of passivation.It is mainly Cr that stainless passive film forms
2O
3Or CrOOH, therefore appropriate chromium alloying is conducive to the raising of alloy passivation and erosion resistance.In the dilute sulphuric acid of reductibility, it is more obvious that chromium and nickel, molybdenum and copper are used in conjunction with effect.Nickel is the thermodynamic instability element, can passivation but passivation ability not as chromium.The corrosion potential of iron nickel alloy moves to positive dirction with the increase of nickel content.Erosion resistance all improves with the increase of nickel content in the nitric acid of sulfuric acid, hydrochloric acid and the oxidisability of reductibility.Illustrate that nickel can improve the thermodynamic stability of ferrous alloy.On the other hand, nickel is that austenite former can enlarge the austenitic area strongly, can improve technique and the mechanical property of alloy.Metal molybdenum is stainless steel and various non-corrosive metal alloy element commonly used, and molybdenum can promote the passivation of alloy and passivation again, falls the low-alloyed blunt electric current that causes.It can make stainless steel surface form the oxide film of rich molybdenum, and this oxide film is not soluble in reductant, so molybdenum can improve alloy reducing resistance medium ability, and can effectively suppress spot corrosion and the crevice corrosion that chlorion causes.These effects of molybdenum are to produce having under the prerequisite of chromium, and corrosion-resistant lining material of the present invention has higher chromium and molybdenum, has effectively brought into play the compound action of chromium and molybdenum.Metallic copper is stainless steel alloy element commonly used, and copper can improve stainless corrosion resistance to sulfuric acid, and the electropotential of copper is higher than hydrogen, can suppress hydrogen evolution corrosion.Being used in conjunction with of copper and molybdenum can be suppressed the dissolving of passive film, and the copper content in stainless steel can be up to 3.Elemental nitrogen is the new alloy method that grew up in 20th century, is strong austenite former.Solubleness can reach 0.4 in austenite, nitrogen be cheap and the element that substitutes effectively nickel (0.1N can be for 2.3～3.0Ni).The solution strengthening of nitrogen can improve the intensity of steel; Nitrogen can improve stainless corrosion resistance nature, especially anti-spot corrosion and crevice corrosion behavior; In this external high-alloy stainless steel, nitrogen can effectively suppress carbide and intermetallic phase when separating out, and improves the processing performances such as welding.The rare earth treatment high-alloy stainless steel starts from U.S. Carpenter company, and rare earth element alloyization is used widely.Rare earth can be controlled form and the desulfating and deoxidation of sulfide, improves the mechanical property of steel.Rare earth plays the effect of microalloying.But Grain Boundary Segregation crystal grain thinning in rare earth atom.Rare earth is little in the solubleness of steel, must strictly control add-on.Be equipped with in addition copper, nitrogen and rare earth and replenish alloying, make it have very strong anti-dilute sulphuric acid corrosive nature and anti-local corrosion performance, have good mechanical property and cold and hot working performance, can substitute nickel-base alloy in Dilute Sulphuric Acid Medium.
The invention has the beneficial effects as follows: this corrosion-resistant stainless steel plate adopts Gao Ge, molybdenum, nitrogen alloying, and with the balance nickel chromium equivalent, the modification of copper trace, the solution treatment condition that adopts simultaneously is 1150 ℃, 20min makes this stainless steel plate have good corrosion resistance nature, mechanical property and welding property.This corrosion-resistant stainless steel can be applicable to the wet chimney corrosion-proof lining of coal fired power plant flue gas desulfurization system.
Description of drawings
Accompanying drawing 1 be the embodiment of the present invention one with the stainless steel plate of contrast material in dilute sulphuric acid 0.1mm/a etc. corrosion curve.
Accompanying drawing 2 overlapping welding seal form schematic diagram.
Accompanying drawing 3 lath fillet welding seal form schematic diagram.
Accompanying drawing 4 butt welding fillet welding seal form schematic diagram.
Accompanying drawing 5 thin plate wallpaper construction technology step 1 schematic diagram.
Accompanying drawing 6 thin plate wallpaper construction technology step 2 schematic diagram.
Accompanying drawing 7 thin plate wallpaper construction technology step 3 schematic diagram.
Accompanying drawing 8 thin plate wallpaper construction technology step 4 schematic diagram.
Specific embodiments
The present invention will be further described below in conjunction with accompanying drawing.
Embodiment one
Make the corrosion-resistant stainless steel plate, stainless material is cold-rolled to 1.6mm thickness, then carry out solution treatment, solid solution temperature is 1150 ℃, insulation 20min.This corrosion-resistant stainless steel plate composition sees Table 1.
Comparative Examples one
Make the corrosion-resistant stainless steel plate, stainless material is cold-rolled to 1.6mm thickness, then carry out solution treatment, solid solution temperature is 1150 ℃, insulation 20min.This corrosion-resistant stainless steel plate composition sees Table 1.
Comparative Examples two
Make the corrosion-resistant stainless steel plate, will be cold-rolled to 1.6mm thickness by stainless material, then carry out solution treatment, solid solution temperature is 1150 ℃, insulation 20min.This corrosion-resistant stainless steel plate composition sees Table 1.
Comparative Examples three
Make the nickel alloy C-276 plate, the nickel alloy C-276 material is cold-rolled to 1.6mm thickness, then carry out solid solution, solid solution temperature is 1150 ℃, insulation 20min.Composition sees Table 1.
Comparative Examples four
Make titanium material TA2 plate, titanium material TA2 is cold-rolled to 1.6mm thickness, then carry out solid solution, solid solution temperature is 1150 ℃, insulation 20min.Composition sees Table 1.
Comparative Examples five
Make the corrosion-resistant stainless steel plate, stainless material is cold-rolled to 1.6mm thickness, then carry out solution treatment, solid solution temperature is 1030 ℃, insulation 8min.This corrosion-resistant stainless steel plate composition is with embodiment one.
Table 1 embodiment of the present invention and contrast material composition
As shown in Figure 1, the erosion resistance in dilute sulphuric acid is Comparative Examples three, embodiment one, Comparative Examples one, Comparative Examples two and Comparative Examples four from high to low, at 20%H
2SO
4Below, the erosion resistance of embodiment one and Comparative Examples three (being nickel alloy C-276) approach.Embodiment one contains enough chromium-nickel content, simultaneously with high molybdenum (〉 6.5%) alloying, and replenish alloying with nitrogen and copper, in the situation that guarantee minimum nickel content, to reduce material cost, implement one and have best erosion resistance, and Comparative Examples one chromium too high levels has exceeded the balance nickel equivalent, causes intermetallic separating out, and has reduced erosion resistance, second Comparative Examples is because Re contains quantity not sufficient, and its erosion resistance is reduced.
The stainless steel plate of embodiment one, its corrosion speed in the dilute sulphuric acid of chloride ion-containing is as shown in table 2.
The corrosion speed (mm/a) of the stainless steel plate of table 2 embodiment one in the dilute sulphuric acid of chloride ion-containing
Table 2 shows that the stainless steel plate of embodiment one has better chromium nickel equivalent, and is also very stable in the dilute sulphuric acid of chloride ion-containing, and even in the very high dilute sulphuric acid of chlorion (chlorion is up to ppm up to ten thousand), still have good corrosion resistance nature.
Our stainless steel plate of having studied embodiment one adds corrosion resistance nature in the dilute sulphuric acid of chlorion at fluoride ion and fluoride ion in addition.Result is as shown in table 3.
The corrosion speed (mm/a) of the stainless steel plate of table 3 embodiment one in the dilute sulphuric acid of fluorine-containing chlorion
Experimental data in table 3 shows, the stainless steel plate of embodiment one is also corrosion resistant in the dilute sulphuric acid of fluoride ion and fluorine-containing chlorion.Therefore be fit to very much wet chimney environment.
The corrosion speed contrast in the dilute sulphuric acid of fluorine-containing chlorion of the stainless steel plate of table 4 embodiment one and Comparative Examples
| Sample | 50%H 2SO 4 | 50%H 2SO 4+1.0Cl - | 50%H 2SO 4+1.0F - |
| Embodiment one | 0.01214 | 0.05702 | 0.02831 |
| Comparative Examples one | 0.05438 | 0.08937 | 0.04563 |
| Comparative Examples two | 0.09811 | 0.1123 | 0.09765 |
Table 4 shows that the stainless steel plate erosion resistance of embodiment one is higher than the stainless steel plate of Comparative Examples one and Comparative Examples two.
Stainless steel of the present invention belongs to high chromium-stainless steel, adopts simultaneously high molybdenum alloy, and has added anti-spot corrosion elemental nitrogen.Experimental formula according to the spot corrosion index: PREN=1%Cr+3.3%Mo+16%N calculates and shows, stainless spot corrosion index of the present invention can reach 45.(15%H at 80 ℃
2SO
4+ 0.2%Cl
-), (15%H
2SO
4+ 0.5%Cl
-) and (15%H
2SO
4+ 0.2%F
-) medium, the stainless steel plate of embodiment one is carried out the spot corrosion experiment, result is not found point corrosion pit.Illustrate that stainless steel that the component of embodiment one is made has higher anti-spot corrosion and anti-fluorine, chloride ion corrosion performance.In addition, according to ASTMG48 at FeCl
3Measuring the stainless Critical Crevice corrosion temperature that the component of embodiment one makes in solution is 113 ℃, be more or less the same with 122 ℃ of the Critical Crevice temperature of nickel alloy C-276, so the anti-crevice corrosion behavior of the stainless steel plate of embodiment one is good.
Stress corrosion crack (SCC) is one of the most dangerous local corrosion collapse mode.So stainless steel plate, as the structured material that uses in corrosive environment, must its Sensitivity of Stress Corrosion of evaluation.With reference to the regulation of GB/T17898-1999, specimen size is 0.9 * 15 * 75, and polish with grinding machine the side.Sample is bent to U-shaped on universal testing machine with the 10mm pressure head.Then adopt tetrafluoroethylene screw stress application, respectively at the (15%H of 80 ℃
2SO
4+ 0.2%Cl
-), (15%H
2SO
4+ 0.5%Cl
-) and (15%H
2SO
4+ 0.2%F
-) test in medium.Result does not find that the stainless steel plate of embodiment one produces stress corrosion crack (SCC).
Below we compare the mechanical property of the stainless steel plate of embodiment one and Comparative Examples five.The mechanical property of embodiment one stainless steel plate and cupping are as being worth as shown in table 5,7; The mechanical property of Comparative Examples five, as shown in table 6.
The stainless steel plate mechanical property of table 5 embodiment one
The stainless steel plate mechanical property of table 6 Comparative Examples five
The stainless steel plate Erichsen number of table 7 embodiment one
| Heat-treat condition | Cup area of bed (mm) | Erichsen number (mm) |
| 1030 ℃ * 8 minutes | Φ10 | 6.0 |
| 1150 ℃ * 20 minutes | Φ10 | 10.7 |
Can get from table 5, table 6 and table 7, through 1150 ℃, the stainless steel plate of the solution treatment of 20min, its mechanical property and contrast technique are (through 1030 ℃, that the stainless steel plate of the solution treatment of 8min) improves is many, and about unit elongation on average was doubled, this moment, sheet material plasticity was improved greatly.Erichsen number improves more than 40%, has better deep-draw and forming property this moment.
The mechanical property contrast of the stainless steel plate of table 8 embodiment one and Comparative Examples one and Comparative Examples two
| Sample | Tensile strength (Mpa) | Yield strength (Mpa) | Unit elongation (%) |
| Embodiment one | 716 | 400 | 46 |
| Comparative Examples one | 700 | 389 | 40 |
| Comparative Examples two | 687 | 378 | 33 |
Can get from table 8, the mechanical property of the stainless steel plate of embodiment one is better than Comparative Examples one and Comparative Examples two.The component ratio that has shown stainless steel plate of the present invention is selected the best, is that the mechanical property of stainless steel plate of the present invention is better than the stainless steel plate that other component ratios are made.
The wet chimney corrosion-proof lining of a kind of coal fired power plant flue gas desulfurization system adopts the corrosion-resistant stainless steel plate to make.Adopt corrosion-resistant stainless steel plate wallpaper technique to carry out anticorrosive construction, concrete manufacture craft is divided two stages: corrosion-resistant stainless steel plate 1 and the fixedly weldering of carbon steel substrate 2 and the sealing weld of corrosion-resistant stainless steel plate.Detailed process is as follows: 1. cleaning carbon steel substrate 2, for the chimney that renovates, it is carried out cleaning with clear water after the shot-peening sandblasting, and also need except above-mentioned steps for newly-built chimney polish its surface.Corrosion-resistant stainless steel plate 1 also need keep cleaning surfaces.
With first plot of corrosion-resistant stainless steel plate 1 tack-weld in carbon steel substrate 2, and adopt in plate plug welding 4 and edges of boards fixedly fillet welding 5 first block of corrosion-resistant stainless steel plate is firmly fixed in carbon steel substrate 2.Gage of wire is 0.89mm or 1.1mm, can adopt bulk material the present invention to do the filler metal welding, certainly preferably adopts nickel-base alloy 625 to do filler metal.In plate, plug welding 4 needs pre-punched hole on stainless steel plate 1, and aperture Φ 12.7mm is good, pitch of holes 60cm.Edges of boards are fillet welding 5 length 25mm fixedly, spacing 150mm.
Second block of corrosion-resistant stainless steel plate 1 is fixed in carbon steel substrate 2 with the mode in the of first, difference be second block of corrosion-resistant stainless steel plate can with first overlapping lap seal fillet welding 3, can be not overlapping and seal fillet welding 3 by other one little corrosion-resistant stainless steel plate welding bar yet.The limit section of sealing fillet welding 3 needs overlapping 25mm.Corrosion-resistant stainless steel plate 1 is fixing and seal welding is until whole inner wall of stack is all covered (seeing Fig. 2-8) fully by corrosion-resistant stainless steel plate 1 so successively.
Claims (4)
1. corrosion-resistant stainless steel plate, it is characterized in that: by mass percentage, composed of the following components: C :≤0.020%, Si :≤0.80%, Mn :≤1.00%, S :≤0.010%, P :≤0.030%, Cr:19.50～20.50%, Ni:17.50～18.50%, Mo:6.50～7.00%, Cu:0.50～1.00%, N:0.22～0.30%, Re:0.10%～0.15%, its surplus is Fe.
2. a kind of corrosion-resistant stainless steel plate as claimed in claim 1, it is characterized in that: by mass percentage, composed of the following components: C:0.012%, Si:0.75%, Mn:0.74%, S:0.008%, P:0.028%, Cr:19.98%, Ni:18.01%, Mo:6.56%, Cu:0.89%, N:0.25%, Re:0.12%, Fe:52.652%.
One kind as claimed in claim 1 the corrosion-resistant stainless steel plate the preparation method, it is characterized in that: stainless material is cold-rolled to 1.6mm thickness, then carries out solution treatment, solid solution temperature is 1150 ℃, the insulation 20min.
4. the anticorrosion construction method of the wet chimney lining of coal fired power plant flue gas desulfurization system take the described corrosion-resistant stainless steel plate of claim 1 or 2 as plate, is characterized in that: comprise following processing step:
At first a fixedly is welded in first and second block of corrosion-resistant stainless steel plate in the carbon steel substrate;
The described first block of corrosion-resistant stainless steel plate of b and second overlapping phase seal welding of corrosion-resistant stainless steel plate portion, perhaps described first block of corrosion-resistant stainless steel plate and second block of corrosion-resistant stainless steel plate are by corrosion-resistant stainless steel plate welding bar seal welding;
C so successively the corrosion-resistant stainless steel plate is fixing and seal welding until whole inner wall of stack all covered fully by the corrosion-resistant stainless steel plate.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104046913A (en) * | 2013-11-28 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Application of stainless steel material, flue, and flue making method |
| CN106551589A (en) * | 2017-02-08 | 2017-04-05 | 张有明 | A kind of constant temperature drinking device |
| CN106834967A (en) * | 2017-02-10 | 2017-06-13 | 杭州振华钣金有限公司 | It is a kind of to be exclusively used in formula of stainless steel of cable pulley of crane and preparation method thereof |
| CN106834966A (en) * | 2017-02-10 | 2017-06-13 | 杭州振华钣金有限公司 | A kind of processing technology of cable pulley of crane |
| CN111560566A (en) * | 2020-05-18 | 2020-08-21 | 江苏京成机械制造有限公司 | Corrosion-resistant alloy material and desulfurization pipe fitting based on same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102212758A (en) * | 2011-05-24 | 2011-10-12 | 宣达实业集团有限公司 | High-alloy stainless steel for impurity-containing dilute sulphuric acid medium and processing method thereof |
| CN202400843U (en) * | 2011-12-24 | 2012-08-29 | 宣达实业集团有限公司 | Dry absorption tower for producing concentrated sulfuric acid |
-
2013
- 2013-03-08 CN CN201310074091.9A patent/CN103131961B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102212758A (en) * | 2011-05-24 | 2011-10-12 | 宣达实业集团有限公司 | High-alloy stainless steel for impurity-containing dilute sulphuric acid medium and processing method thereof |
| CN202400843U (en) * | 2011-12-24 | 2012-08-29 | 宣达实业集团有限公司 | Dry absorption tower for producing concentrated sulfuric acid |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104046913A (en) * | 2013-11-28 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Application of stainless steel material, flue, and flue making method |
| CN106551589A (en) * | 2017-02-08 | 2017-04-05 | 张有明 | A kind of constant temperature drinking device |
| CN106834967A (en) * | 2017-02-10 | 2017-06-13 | 杭州振华钣金有限公司 | It is a kind of to be exclusively used in formula of stainless steel of cable pulley of crane and preparation method thereof |
| CN106834966A (en) * | 2017-02-10 | 2017-06-13 | 杭州振华钣金有限公司 | A kind of processing technology of cable pulley of crane |
| CN111560566A (en) * | 2020-05-18 | 2020-08-21 | 江苏京成机械制造有限公司 | Corrosion-resistant alloy material and desulfurization pipe fitting based on same |
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|---|---|
| CN103131961B (en) | 2015-09-09 |
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Effective date of registration: 20170821 Address after: Dong'ou Industrial Zone Oubei town of Yongjia County, Wenzhou City, Zhejiang province 325100 Patentee after: ZHEJIANG XUANDA SPEICAL ALLOY FLOW EQUIPMENT CO., LTD. Address before: Dong'ou Industrial Zone Oubei town of Yongjia County, Wenzhou City, Zhejiang province 325105 Patentee before: Xuanda Industrial Group Co., Ltd. |