CN109266988A - A kind of sinking roller and stabilizing roller - Google Patents
A kind of sinking roller and stabilizing roller Download PDFInfo
- Publication number
- CN109266988A CN109266988A CN201811383018.9A CN201811383018A CN109266988A CN 109266988 A CN109266988 A CN 109266988A CN 201811383018 A CN201811383018 A CN 201811383018A CN 109266988 A CN109266988 A CN 109266988A
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- Prior art keywords
- roller
- stabilizing
- sinking
- cobalt
- matrix
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- 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
- C22C38/40—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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a kind of sinking roller and stabilizing rollers.Sinking roller and stabilizing roller use iron-based material as matrix, roller set is installed on matrix, roller set material be by weight percentage include following component cobalt-base alloys: 10% ~ 40% Cr, 0.1% ~ 15% Ni, 0.1% ~ 15% W, 0.1% ~ 10% Mo, 0.01% ~ 5.0% V, 0.01% ~ 5.0% Ti, 0.01% ~ 1.5% C, 0.01% ~ 20% Fe, 0.01% ~ 5.0% Al, 0.1% ~ 3.0% Mn, 0.01% ~ 5.0% Nb, 0.1% ~ 3.0% Si, remaining be Co and inevitable impurity.Sinking roller and stabilizing roller of the invention uses the roller set made of cobalt-base alloys, to make the heat-resisting bath corrosion of the working face of sinking roller and stabilizing roller and reduce dry slag, the time is used after extending processing every time, reduce the number of processing and replacement, reduce waste product resulting from and improves product total quality, production cost can be greatlyd save, and makes the processing of sinking roller and stabilizing roller and manufacture more convenient.
Description
Technical field
The present invention relates to the equipment in the hot coating technology field of metallurgy industry, in particular it relates to a kind of hot dip
Sinking roller and stabilizing roller are equipped with the roller set of cobalt-base alloys on the matrix of roller.
Background technique
Due to hot coating process high production efficiency, so having obtained relatively broad answer in metallurgy and clad steel sheet industry
With.Hot plating technology includes that hot-dip aluminizing zinc (GL), hot pure zinc plating (GI), hot dip zinc-aluminium, hot dip fine aluminium etc. are several.With hot galvanizing work
For skill, for strip when continuous hot galvanizing produces, steel band changes the direction of motion by the sinking roller being immersed in zinc liquid.Due to
Sinking roller and axle sleeve are in the zinc liquid of melting, it will usually serious melting zine corrosion occur.In addition, due to sinking roller and surely
Fixed roll is directly contacted with hot dips liquid such as galvanizing flux, aluminum plating liquids, cause roll surface wearing and corrode it is more serious, therefore, sinking roller and
The working life of stabilizing roller is shorter.
Currently, material used in sinking roller and stabilizing roller mostly uses 00Cr17Ni14Mo2 (to be equivalent to SUS316L material
Matter), 1Cr13 stainless steel material or in surface spray-coating anticorrosive anti-wear layer.In particular, generally in surface spray-coating Co-
WC or MoB/CoCr-WC etc. is used as anticorrosive anti-wear layer, causes anticorrosive anti-wear due to material and spraying process etc.
Layer exist centainly as crackle, it is not fine and close the defects of, the penetrating power of plating solution is stronger in addition, it is easy to penetrate spray coating and rotten
Erosion roll surface causes spray coating to fail, while the defect of spray coating is also easy dry slag.However, in use, due to dry slag etc.
Reason be easy to cause the product produced, and there are mass defects, if surface grooves print, spangle are unequal, to cause sinking roller
Service life is unstable after each repair with stabilizing roller, replaces frequently, and makes unstable product quality.Therefore, it needs to change
Into sinking roller and stabilizing roller, to prolong its service life, product quality is improved.
Summary of the invention
Present invention seek to address that the above-mentioned problems in the prior art.Therefore, the present invention provides one kind to be equipped with roller
The sinking roller and stabilizing roller of set, its operating condition in hot-dip aluminizing zinc liquid, heat galvanizing liquid, hot dip zinc-aluminium, hot dip fine aluminium liquid etc.
Under, there is good heating conduction, enough intensity, elongation percentage, lesser thermal expansion coefficient, low modulus of elasticity etc. are good
Heat-resistant anti-fatigue parameter, compared with existing iron-based material and ceramic material bearing shell roller set, service life and reliable and stable degree mention significantly
It is high.
Sinking roller and stabilizing roller of the invention, as matrix, is equipped with roller set, the roller using iron-based material on matrix
The material of set is the cobalt-base alloys for by weight percentage including following component: 10%~40% Cr, 0.1%~15%
Ni, 0.1%~15% W, 0.1%~10% Mo, 0.01%~5.0% V, 0.01%~5.0% Ti, 0.01%
~1.5% C, 0.01%~20% Fe, 0.01%~5.0% Al, 0.1%~3.0% Mn, 0.01%~5.0%
Nb, 0.1%~3.0% Si, remaining be Co and inevitable impurity.
In accordance with the present invention it is preferred that cobalt-base alloys includes following component: 20%~30% Cr, 0.1%~10%
Ni, 0.1%~10% W, 0.1%~5.5% Mo, 0.01%~3.0% V, 0.01%~3.0% Ti, 0.01%
~1.5% C, 0.01%~15% Fe, 0.01%~3.0% Al, 0.1%~2.0% Mn, 0.01%~3.0%
Nb, 0.1%~2.0% Si, remaining be Co and inevitable impurity.Roller set with a thickness of 1mm-50mm.
According to the present invention, described matrix is heat-resisting iron-based material, for example, ferritic stainless steels, austenitic stainless steels
Or austenite-ferrite type stainless steel etc..
The invention has the advantages that sinking roller and stabilizing roller use the roller set made of cobalt-base alloys, thus improving
While the corrosion resistance of sinking roller and stabilizing roller, wear resistance, the working face that can also improve sinking roller and stabilizing roller is heat-resisting
Bath corrosion and reduction dry slag, use the time after extending processing every time, reduce the number of processing and replacement, reduce
Waste product resulting from simultaneously improves product total quality, can greatly save production cost, and make sinking roller and stabilizing roller
Processing and manufacture it is more convenient.
In the present invention, sinking roller is identical with structure with the material of stabilizing roller, therefore, hereinafter will be with sinking roller
Example explains the present invention.
The sinking roller of hot dip according to the present invention includes matrix and the roller set that is mounted on matrix.According to the present invention, base
Body is iron-based material, for example, ferritic stainless steels, austenitic stainless steels or austenite-ferrite type stainless steel etc. are heat-resisting
Steel grade.Roller covers the working surface layers as sinking roller.
There are gap, the matching relationship between matrix and roller set between matrix and the roller set of sinking roller or stabilizing roller of the invention
For hot charging, interference fit or cold charge, clearance fit, fixture (such as pin, screw, keyway) is fixed or is welded and fixed.
In the present invention, the material of the roller set 2 of sinking roller and stabilizing roller according to the present invention is cobalt-base alloys, thickness
1mm-50mm, to meet the needs for using and repeatedly processing roller set face in use process.By weight percentage, cobalt-base alloys
Including following components: 10%~40% Cr, 0.1%~15% Ni, 0.1%~15% W, 0.1%~10% Mo,
0.01%~5.0% V, 0.01%~5.0% Ti, 0.01%~1.5% C, 0.01%~20% Fe, 0.01%
~5.0% Al, 0.1%~3.0% Mn, 0.01%~5.0% Nb, 0.1%~3.0% Si, remaining is Co and not
Evitable impurity.
In the following, will be explained in detail the specific effect of each component.
Chromium (Cr) is the important alloying element of cobalt-base alloys.High chromium content can guarantee the inoxidizability of alloy and resistance to
Corrosivity, chromium can form the phase and intermetallic compound of a series of different tissues structures with cobalt, while chromium and carbon are easy to form
The carbide reinforced phase of Cr7C3, Cr23C6 and solution strengthening matrix, therefore, chromium can significantly improve the room temperature and high temperature of cobalt-base alloys
Mechanical property.However, the too low resistance to high temperature corrosion performance that will reduce cobalt-base alloys of chromium content, and chromium content is excessively high will reduce cobalt
The creep rupture strength of based alloy.Therefore, in the present invention, it is preferred to, in cobalt-base alloys the content of chromium be 10wt% extremely
40wt%.It is further preferred that taking into account room temperatures and the high-temperature mechanics such as corrosion resistance, resistance to high temperature corrosion performance, creep rupture strength
Can, the content of chromium is set to 20wt%-30wt%.
Nickel (Ni) can be dissolved well in Co matrix, and nickel is as stable alpha-Co and fault quantity in cobalt-base alloys
Essential element, Co3Ni and CoNi3 ordered phase is likely to form in cobalt-base alloys, nickel can improve toughness, but cannot improve
The intensity of cobalt-base alloys, no invigoration effect.In the present invention, it is preferred to which the content of nickel is 0.01wt- in cobalt-base alloys
15wt%.If the content of Ni is more than 15wt%, the intensity of cobalt-base alloys will be reduced to a certain degree.Preferably, the content of nickel
For 0.1wt% to 10wt%.
Carbon (C) and alloying element such as Cr, W, Mo for being added etc. form carbide, obtain certain tissue and intensity.At this
In invention, the content of carbon is 0.01wt% to 1.5wt%.
Iron (Fe) is the element of strong stable alpha-Co, and γ-Fe and α-Co can be infinitely dissolved.Increase such as with iron-content, cobalt-based
The hardness decline of alloy, magnetic conductivity increase, and iron promotes intermetallic compound σ phase and skeletal like carbide in cobalt-base alloys
Generation.In the present invention, the content of iron is 0.01%~20%.Preferably, the content of iron is 0.01wt% to 15wt%.
Tungsten (W) can promote carbide to be formed and reinforce second-phase strength effect, itself again can solution strengthening matrix, be solid
Molten intensified element.Cobalt and tungsten can form two kinds of interphases of WCo3, W6Co7.With the variation of temperature, the solubility of tungsten becomes
Change.In the present invention, it is preferred to which the content of tungsten is 0.1wt% to 15wt%.
Molybdenum (Mo) can also promote carbide to be formed and reinforce second-phase strength effect, similar with the effect of tungsten, and itself
Energy solution strengthening matrix, is solution strengthening element.But molybdenum is harmful to the high-temperature corrosion resistance of cobalt-base alloys.In the present invention,
Preferably, the content of molybdenum is 0.1wt% to 10wt%.It is further preferred that the content of molybdenum is 0.1wt% to 5.5wt%.
The solid solution and precipitation strength of vanadium (V) element matrix, and improve heat resistance significantly.It simultaneously can be
Alloy i.e. generation of the fire check of hot stage before being cooled to room temperature is reduced to a certain extent, i.e., avoids out to a certain extent
It splits.In the present invention, the content of vanadium is 0.01wt% to 5.0wt%.It is further preferred that the content of vanadium be 0.01wt% extremely
3.0wt%.
The solid solution and precipitation strength of titanium (Ti) element matrix, and improve heat resistance significantly.In the present invention
In, the content of titanium is 0.01wt% to 5.0wt%.It is further preferred that the content of titanium is 0.01wt% to 3.0wt%.
Aluminium (Al) has deoxidation, anti-oxidant, solution strengthening effect.In the present invention, the content of aluminium be 0.01wt% extremely
5.0wt%.It is further preferred that the content of aluminium is 0.01wt% to 3.0wt%.
Manganese (Mn) improves the mobility and casting character of alloy, can play deoxidation, slag making.In the present invention, manganese
Content is 0.1wt% to 3.0wt%.It is further preferred that the content of manganese is 0.1wt% to 2.0wt%.
Carbon, nitrogen, oxygen in niobium (Nb) and metal have extremely strong affinity, can refine crystal grain, improve the intensity of metal and change
Kind plasticity and toughness, while significantly improving resistance to corrosion.In the present invention, the content of niobium is 0.01wt% to 5.0wt%.More
Add preferably, the content of niobium is 0.01wt% to 3.0wt%.
Silicon (Si) can also improve the mobility and casting character of alloy, can play deoxidation, slag making.In the present invention,
The content of silicon is 0.1wt% to 3.0wt%.It is further preferred that the content of silicon is 0.1wt% to 2.0wt%.
As sinking roller, the stabilizing roller of hot dip according to the present invention includes matrix 1 and the roller that is mounted on matrix
Set.In particular, matrix is iron-based material, for example, ferritic stainless steels, austenitic stainless steels or two phase stainless steel etc.
Heat-resisting steel grade.The material of the roller set of stabilizing roller is cobalt-base alloys, with a thickness of 1mm-50mm.By weight percentage, cobalt-base alloys
Including following components: 10%~40% Cr, 0.1%~15% Ni, 0.1%~15% W, 0.1%~10% Mo,
0.01%~5.0% V, 0.01%~5.0% Ti, 0.01%~1.5% C, 0.01%~20% Fe, 0.1%~
5.0% Al, 0.1%~3.0% Mn, 0.1%~5.0% Nb, 0.1%~3.0% Si, remaining is Co and can not
The impurity avoided.
Herein, it should be pointed out that it is applied in cobalt-base alloys in the roller of sinking roller and stabilizing roller of the invention, it can not
The impurity avoided refers to sulphur (S), the element of phosphorus (P) equal size within the allowable range.
The present invention obtains the material of the working surface layers of optimal proportion, so that cobalt-based closes by the way that the above ingredient to be combined
Gold is that sinking roller and stabilizing roller bring anticorrosive anti-wear and heat-resisting good result, extends the maintenance replacement cycle, therefore
Just reduce replacement number, reduces the loss for the bring a large amount of waste product and defect ware that resume production because replacing axle sleeve, subtract
Lack loss and also just improves benefit.
In the following, the present invention more fully will be explained in conjunction with specific embodiments.
The matrix of sinking roller and stabilizing roller is that 00Cr17Ni14Mo2 stainless steel material (it is stainless to be equivalent to austenite Ultra-low carbon
Steel SUS316L), chemical component is C≤0.03wt%, Cr 16wt%~18wt%, Ni 10wt%~14wt%, Mo
2.00wt%~3.00wt%, Mn≤2.00wt%, Si≤1.00wt%；The mounted roller set on its matrix, the material that roller covers are
Cobalt-base alloys, the ingredient of cobalt-base alloys are as follows: Cr 25wt%, Ni 0.2wt%, W 15wt%, Mo 3wt%, V 0.01wt%,
Ti 0.1wt%, C 0.3wt%, Fe 6wt%, Si 2.0wt%, Mn 3.0wt%, Al 5.0wt%, Nb 5.0wt%, P
< 0.07wt%, S < 0.07wt%, remaining is Co.Roller set and matrix is gap-matched, roller set with a thickness of 29mm, roller set
It with matrix is installed on matrix by way of hot charging, interference fit.
The sinking roller and stabilizing roller of the sinking roller of embodiment 1 and stabilizing roller and prior art are used in identical unit,
Using the result shows that, sinking roller of the invention and stabilizing roller after roll surface is processed, every time using the time be 10 days or more,
The sinking roller of technology and the time that uses of stabilizing roller are 3-5 days.Sinking roller and stabilizing roller of the invention is using the time
There are the sinking roller of technology and 2 times or more using the time of stabilizing roller, that is, sinking roller and stabilizing roller of the invention uses the time
It is apparently higher than the sinking roller and stabilizing roller of the prior art.
Claims (5)
1. the sinking roller and stabilizing roller of a kind of hot dip, the sinking roller and stabilizing roller use iron-based material as matrix, in base
Roller set is installed, which is characterized in that the material of the roller set is the cobalt-based consisted of the following compositions by weight percentage on body
Alloy: 10%~40% Cr, 0.1%~15% Ni, 0.1%~15% W, 0.1%~10% Mo, 0.01%~
5.0% V, 0.01%~5.0% Ti, 0.01%~1.5% C, 0.01%~20% Fe, 0.01%~5.0%
Al, 0.1%~3.0% Mn, 0.01%~5.0% Nb, 0.1%~3.0% Si, remaining for Co and inevitably
Impurity,
Wherein, roller set with a thickness of 1mm-50mm.
2. the sinking roller and stabilizing roller of hot dip as described in claim 1, which is characterized in that the cobalt-base alloys is by following
By weight percentage at being grouped as: 20%~30% Cr, 0.1%~10% Ni, 0.1%~10% W, 0.1%
~5.5% Mo, 0.01%~3.0% V, 0.01%~3.0% Ti, 0.01%~1.5% C, 0.01%~15%
Fe, 0.01%~3.0% Al, 0.1%~2.0% Mn, 0.01%~3.0% Nb, 0.1%~2.0% Si,
Remaining is Co and inevitable impurity.
3. the sinking roller and stabilizing roller of hot dip as described in claim 1, which is characterized in that described matrix is heat-resisting iron-based
Material.
4. the sinking roller and stabilizing roller of hot dip as claimed in claim 3, which is characterized in that the heat-resisting iron-based material is
Ferritic stainless steels, austenitic stainless steels or austenite-ferrite type stainless steel.
5. the sinking roller and stabilizing roller of hot dip as described in claim 1, which is characterized in that the roller set and described matrix
Between matching relationship be that hot charging, interference fit or cold charge, clearance fit, fixture are fixed or be welded and fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811383018.9A CN109266988A (en) | 2018-11-20 | 2018-11-20 | A kind of sinking roller and stabilizing roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811383018.9A CN109266988A (en) | 2018-11-20 | 2018-11-20 | A kind of sinking roller and stabilizing roller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109266988A true CN109266988A (en) | 2019-01-25 |
Family
ID=65189486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811383018.9A Withdrawn CN109266988A (en) | 2018-11-20 | 2018-11-20 | A kind of sinking roller and stabilizing roller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109266988A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110343986A (en) * | 2019-07-17 | 2019-10-18 | 攀钢集团工程技术有限公司 | For the construction method in zinc-plated sinking roller shaft end composite bush |
| CN112281099A (en) * | 2020-10-13 | 2021-01-29 | 江苏联捷冶金设备有限公司 | Tungsten-cobalt alloy sink roll and preparation method thereof |
| CN114807757A (en) * | 2022-04-25 | 2022-07-29 | 朝阳联强轧辊有限公司 | Die steel roll for large and medium channel steel finished product rack and casting process thereof |
-
2018
- 2018-11-20 CN CN201811383018.9A patent/CN109266988A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110343986A (en) * | 2019-07-17 | 2019-10-18 | 攀钢集团工程技术有限公司 | For the construction method in zinc-plated sinking roller shaft end composite bush |
| CN112281099A (en) * | 2020-10-13 | 2021-01-29 | 江苏联捷冶金设备有限公司 | Tungsten-cobalt alloy sink roll and preparation method thereof |
| CN114807757A (en) * | 2022-04-25 | 2022-07-29 | 朝阳联强轧辊有限公司 | Die steel roll for large and medium channel steel finished product rack and casting process thereof |
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Application publication date: 20190125 |