CN106435124A - Technique for producing shining stainless steel pipe - Google Patents
Technique for producing shining stainless steel pipe Download PDFInfo
- Publication number
- CN106435124A CN106435124A CN201611197045.8A CN201611197045A CN106435124A CN 106435124 A CN106435124 A CN 106435124A CN 201611197045 A CN201611197045 A CN 201611197045A CN 106435124 A CN106435124 A CN 106435124A
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- heat treatment
- steel pipe
- steel tube
- production technology
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a technique for producing a shining stainless steel pipe. The technique comprises the steps of unreeling, forming, welding and cutting. Between the welding step and the cutting step, the technique further comprises the following steps that the stainless steel pipe is firstly placed into a heat treatment box filled with protective gas, air pressure in the heat treatment box is 0.4MPa-0.65MPa, the temperature of the stainless steel pipe is made to reach 1000 DEG C-1100 DEG C, and the time of heat treatment is 300-420 seconds; and then the stainless steel pipe is moved to a cooling pipe filled with protective gas to be cooled naturally, the time of cooling treatment is 300-420 seconds, and the pressure in the cooling pipe is 0.4MPa-0.65MPa. According to the technique for producing the shining stainless steel pipe, an original step that the stainless steel pipe is conveyed to a heat treatment station after being cut is omitted; and when the surface of the stainless steel pipe is subjected to heat treatment, grey black oxide skin is not generated, subsequent acid pickling and polishing are not needed, the working process is simpler, and pollution is avoided in the production process.
Description
Technical field
The present invention relates to stainless steel tube true qualities whitening processing field, more particularly, to a kind of bright stainless steel pipe without pickling
Production technology.
Background technology
Current stainless steel tube in process, sequentially passes through and unreels, molding, after welding and cutting, then transports to heat
Process station, made annealing treatment under air ambient.In this production technology, due to stainless steel tube moulding process and heat treatment
Technique separately two lines, need setting place specially to place in the way stainless steel tube after cutting being moved to heat treatment station stainless
Steel pipe, and transportation expends the time and needs extra transporting equipment.For being processed into the steel plate of stainless steel tube in rolling
Under state, its surface is also more bright, but when being made annealing treatment under air ambient, the surface of stainless steel tube is in hot conditionss
Under occur and aoxidize and produce black oxidation skin, affect stainless steel tube epidermis quality.
This hard grey black oxide skin is typically removed by the method that Fluohydric acid. and nitric acid carry out pickling, or employing is beaten
Mill mode removes, and removes the stainless steel tube package sale again after black oxidation skin.However, the cost using acid washing method is big, row
Environment can be polluted after dirt, and corrosivity are larger, harmful；And make a return journey except black oxide skin by polishing, its work
Sequence is relatively complicated, and the brightness of this part and other positions can be made after detail sanding cannot to unify, and finished product color and luster is poor.Separately
External oxidation skin chemical treatment method also has the inorganic additive using a kind of free of contamination acid wash passivation cream and room temperature nonhazardouss
Cleanout fluid is embathed, thus improving the surface anticorrosion quality of stainless steel productss, reaches the whitening processing purpose of rustless steel true qualities.
However, acid wash passivation cream is contacted with skin can corrode skin, imprudence suction can lead to laryngopharynx swelling and pain, and amount causes pulmonary's water when many
Swollen.
For solving problem above, the present invention is provided with heat treatment and the cold treatment work of stainless steel tube between welding and cutting
Sequence, two original line of production technology are unified into one, and after eliminating cutting originally, transport stainless steel tube is to heat treatment station
Step, and in heat treatment and cold-treating process, stainless steel tube is constantly in full of in the environment of protective gas, it is to avoid
The surface of stainless steel tube grey black oxide skin in the case that temperature is higher, so that the stainless steel tube after cooling need not be again
Carry out pickling, decrease the pollution that blowdown process causes.
Content of the invention
It is an object of the invention to provide a kind of bright stainless steel pipe production technology without pickling, after eliminating cutting originally
Transport stainless steel tube to the step of heat treatment station, and the surface of stainless steel tube is not in grey black oxidation in heat treatment
Skin, subsequently need not carry out pickling or polishing again, and operation is simpler, and production process is pollution-free.
For achieving the above object, the present invention provides a kind of bright stainless steel pipe production technology, including unreeling, molding, welding,
Cutting, further comprising the steps of between welding and cutting：
Heat treatment step：Stainless steel tube is made to be placed in full of in the heat treatment box of protective gas, the air pressure in heat treatment box is
0.4MPa-0.65MPa；The temperature of stainless steel tube is made to reach 1000 DEG C -1100 DEG C, heat treatment time is the 300-420 second；
Cold treatment step：Stainless steel tube was moved to full of natural cooling in the cooling pipe of protective gas, cold treatment time
For the 300-420 second, the air pressure in cooling pipe is 0.4MPa-0.65MPa.
As a further improvement on the present invention, it is provided with the high-frequency heating pipe that outside is wound with coil, institute in described heat treatment box
State stainless steel tube and pass through described high-frequency heating pipe.
As the further improvement of the present invention, in described heat treatment step, the temperature in heat treatment box is made to reach 1060
℃.
As the further improvement of the present invention, in described heat treatment step, heat treatment time is 360 seconds.
As the further improvement of the present invention, in described cold treatment step, the cold treatment time is 360 seconds.
As the further improvement of the present invention, the air pressure in described heat treatment box and cooling pipe is 0.5MPa.
As the further improvement of the present invention, also has cleaning step after described cold treatment step：With clear water to stainless
Steel pipe is carried out and cools down.
As the further improvement of the present invention, described protective gas is one of them of nitrogen or argon.
Beneficial effect
Compared with prior art, the bright stainless steel pipe production technology of the present invention has advantages below：
1st, transport again after having cut stainless steel tube before comparing, to another production line, heat treatment is carried out to stainless steel tube, this
Two original line of production technology are unified into one by invention, and after eliminating cutting originally, transport stainless steel tube is to heat treatment station
Step, the local special stainless steel tube placed and cut into multistage need not be set, without extra transporting equipment, save life
Product time and cost of transportation；
2nd, protective gas makes stainless steel tube be difficult to react with other materials during heat treatment and natural cooling,
Thus avoiding stainless steel pipe surface the phenomenon of grey black oxide skin and fouling, being cooled to the stainless steel tube after room temperature need not be again
Remove grey black oxide skin by way of pickling or polishing, it is to avoid because of using acidic materials etching apparatus, equipment uses
Time longer, and it also avoid acidic materials and with human contact, it damaged, safety is more in process of production
High；And eliminate the polishing to grey black oxide skin, can make the surface color of stainless steel tube and smoothness evenly it is ensured that finished product
Surface quality；
3rd, it is provided with the high-frequency heating pipe that outside is wound with coil in heat treatment box, firing rate is fast；
4th, the water in water washing chamber can not only be carried out to stainless steel tube, moreover it is possible to accelerate the rate of cooling of stainless steel tube, making
It is quickly down to room temperature, thus natural cooling need not be carried out using longer cooling pipe, has saved device fabrication cost and has set
The standby space taking.
By description below and combine accompanying drawing, the present invention will become more fully apparent, and these accompanying drawings are used for explaining the present invention
Embodiment.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of bright stainless steel pipe production technology.
In figure, heat treatment box 1；High-frequency heating pipe 11；Cooling pipe 2；Water washing chamber 3；Water inlet 31；Outlet 32；Stainless
Steel pipe 4.
Specific embodiment
With reference now to Description of Drawings embodiments of the invention,.
Embodiment 1
The specific embodiment of the present invention is as shown in figure 1, a kind of bright stainless steel pipe production technology, its equipment bag using
Include heat treatment box 1, cooling pipe 2 and the water washing chamber 3 being sequentially arranged along stainless steel tube 4 moving direction.It is provided with outer in heat treatment box 1
Side is wound with the high-frequency heating pipe 11 of coil, and stainless steel tube 4 passes through described high-frequency heating pipe 11.In heat treatment box 1 and cooling pipe 2
It is each filled with the protective gas that air pressure is 0.4MPa, protective gas adopts nitrogen.Water washing chamber 3 is provided with water inlet 31 and outlet
32, wherein, water inlet 31 and outlet 32 along with being reversely sequentially arranged of the moving direction of stainless steel tube 4, water inlet 31 is arranged
In the bottom of water washing chamber 3, outlet 32 is arranged on the top of water washing chamber 3, and water enters water washing chamber 3 from water inlet 31, and from water outlet
Mouth 32 outflow water washing chambers 3.The flow process of bright stainless steel pipe production technology includes unreeling, molding, welding, cutting, wherein, in welding
Further comprising the steps of and cutting between：
1) heat treatment step：Stainless steel tube 4 is made to be placed in full of in the heat treatment box 1 of nitrogen, the air pressure in heat treatment box 1 is
0.4MPa；The temperature of stainless steel tube 4 is made to reach 1000 DEG C, heat treatment time is 420 seconds；
2) cold treatment step：Stainless steel tube 4 was moved to full of natural cooling in the cooling pipe 2 of nitrogen, cold treatment time
For 300 seconds, the air pressure in cooling pipe 2 was 0.4MPa；
3) cleaning step：Stainless steel tube 4 moves to water washing chamber 3, by the clear water in water washing chamber 3, stainless steel tube 4 is entered
Row cleans and is cooled to room temperature.
Stainless steel tube 4 after cleaning is cut into multistage and packs.
Because stainless steel tube 4 adopts the natural type of cooling in cooling pipe 2, stainless steel tube 4 and room in cooling procedure
The temperature difference of temperature tapers into so as to rate of cooling constantly slows down, and the water energy passed through in water washing chamber 3 accelerates the cold of stainless steel tube 4
But speed, so as to quickly be down to room temperature, thus longer cooling pipe 2 need not be adopted, save device fabrication cost and equipment
The space taking.
Transport again after having cut stainless steel tube 4 before comparing, to another production line, heat treatment is carried out to stainless steel tube, this
Two original line of production technology are unified into one by invention, and after eliminating cutting originally, transport stainless steel tube 4 is to heat treatment work
The step of position, need not set the stainless steel tube that local special placement cuts into multistage, without extra transporting equipment, save
Production time and cost of transportation.Additionally, protective gas makes stainless steel tube be difficult to it during heat treatment and natural cooling
Its material reacts, thus avoiding stainless steel pipe surface the phenomenon of grey black oxide skin and fouling, after being cooled to room temperature
Stainless steel tube need not remove grey black oxide skin again by way of pickling or polishing, it is to avoid because rotten using acidic materials
Erosion equipment, the time that equipment uses is longer, and it also avoid acidic materials and human contact and it is damaged, in production
During safety higher；And eliminate the polishing to grey black oxide skin, surface color and the smoothness of stainless steel tube can be made
Evenly it is ensured that finished surface quality.
Embodiment 2
It is with the difference of embodiment 1, in heat treatment box 1 and cooling pipe 2, be each filled with the nitrogen that air pressure is 0.65MPa
Gas.The flow process of bright stainless steel pipe production technology includes unreeling, molding, welding, cutting, wherein, between welding and cutting also
Comprise the following steps：
1) heat treatment step：Stainless steel tube 4 is made to be placed in full of in the heat treatment box 1 of nitrogen, the air pressure in heat treatment box 1 is
0.65MPa；The temperature of stainless steel tube 4 is made to reach 1100 DEG C, heat treatment time is 300 seconds；
2) cold treatment step：Stainless steel tube 4 was moved to full of natural cooling in the cooling pipe 2 of nitrogen, cold treatment time
For 420 seconds, the air pressure in cooling pipe 2 was 0.65MPa；
3) cleaning step：Stainless steel tube 4 moves to water washing chamber 3, by the clear water in water washing chamber 3, stainless steel tube 4 is entered
Row cleans and is cooled to room temperature.
Embodiment 3
It is with the difference of embodiment 1, in heat treatment box 1 and cooling pipe 2, be each filled with the nitrogen that air pressure is 0.5MPa
Gas.The flow process of bright stainless steel pipe production technology includes unreeling, molding, welding, cutting, wherein, between welding and cutting also
Comprise the following steps：
1) heat treatment step：Stainless steel tube 4 is made to be placed in full of in the heat treatment box 1 of nitrogen, the air pressure in heat treatment box 1 is
0.5MPa；The temperature of stainless steel tube 4 is made to reach 1060 DEG C, heat treatment time is 360 seconds；
2) cold treatment step：Stainless steel tube is moved to full of natural cooling in the cooling pipe 2 of nitrogen, the cold treatment time is
360 seconds, the air pressure in cooling pipe 2 was 0.5MPa；
3) cleaning step：Stainless steel tube 4 moves to water washing chamber 3, by the clear water in water washing chamber 3, stainless steel tube 4 is entered
Row cleans and is cooled to room temperature.
In above three embodiment, protective gas can also adopt argon, and the cost that it is obtained with nitrogen is all relatively low, is suitable for
Aborning as protective gas.
Above in association with most preferred embodiment, invention has been described, but the invention is not limited in enforcement disclosed above
Example, and modification, the equivalent combinations that the various essence according to the present invention are carried out should be covered.
Claims (8)
1. a kind of bright stainless steel pipe production technology, including unreeling, molding, welding, cutting is it is characterised in that in welding and cut
Further comprising the steps of between cutting：
Heat treatment step：Stainless steel tube is made to be placed in the heat treatment box (1) full of protective gas, the air pressure in heat treatment box (1)
For 0.4MPa-0.65MPa；The temperature of stainless steel tube is made to reach 1000 DEG C -1100 DEG C, heat treatment time is the 300-420 second；
Cold treatment step：Natural cooling in the cooling pipe (2) that stainless steel tube is moved to full of protective gas, the cold treatment time is
The 300-420 second, the air pressure in cooling pipe (2) is 0.4MPa-0.65MPa.
2. a kind of bright stainless steel pipe production technology according to claim 1 is it is characterised in that described heat treatment box (1)
In be provided with outside and be wound with the high-frequency heating pipe (11) of coil, described stainless steel tube passes through described high-frequency heating pipe (11).
3. a kind of bright stainless steel pipe production technology according to claim 1 is it is characterised in that described heat treatment step
In, make the temperature in heat treatment box reach 1060 DEG C.
4. a kind of bright stainless steel pipe production technology according to claim 1 is it is characterised in that described heat treatment step
In, heat treatment time is 360 seconds.
5. a kind of bright stainless steel pipe production technology according to claim 1 is it is characterised in that described cold treatment step
In, the cold treatment time is 360 seconds.
6. a kind of bright stainless steel pipe production technology according to claim 1 is it is characterised in that described heat treatment box (1)
It is 0.5MPa with the air pressure in cooling pipe (2).
7. a kind of bright stainless steel pipe production technology according to claim 1 to 5 is it is characterised in that in described cold treatment
Also has cleaning step after step：With clear water, stainless steel tube is carried out and cools down.
8. a kind of bright stainless steel pipe production technology according to claim 1, described protective gas is nitrogen or argon
One of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611197045.8A CN106435124A (en) | 2016-12-22 | 2016-12-22 | Technique for producing shining stainless steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611197045.8A CN106435124A (en) | 2016-12-22 | 2016-12-22 | Technique for producing shining stainless steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106435124A true CN106435124A (en) | 2017-02-22 |
Family
ID=58215218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611197045.8A Pending CN106435124A (en) | 2016-12-22 | 2016-12-22 | Technique for producing shining stainless steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106435124A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2692160Y (en) * | 2003-10-10 | 2005-04-13 | 吴德应 | Stainless steel pipe on line solid melt heat treatment device |
| CN101117657A (en) * | 2007-08-29 | 2008-02-06 | 太仓市金鑫铜管有限公司 | Bright annealing furnace |
| CN101559446A (en) * | 2009-05-25 | 2009-10-21 | 广州永大不锈钢有限公司 | Method for preparing welded stainless steel pipe of boiler |
| CN201442966U (en) * | 2009-07-03 | 2010-04-28 | 山东荣泰电炉制造有限公司 | Thin-wall stainless steel tube solid solution heat treatment device |
| CN101787418A (en) * | 2010-03-15 | 2010-07-28 | 长沙电机厂有限责任公司 | Metal material continuous- molding on-line anti-oxidation method and device thereof |
| CN201825987U (en) * | 2010-09-27 | 2011-05-11 | 上海宇洋特种金属材料有限公司 | Novel sealing device for high-temperature resistant protective gas |
| CN103710644A (en) * | 2014-01-23 | 2014-04-09 | 江苏银环精密钢管股份有限公司 | Stainless steel seamless steel tube for sulfuric acid waste heat recovery device |
-
2016
- 2016-12-22 CN CN201611197045.8A patent/CN106435124A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2692160Y (en) * | 2003-10-10 | 2005-04-13 | 吴德应 | Stainless steel pipe on line solid melt heat treatment device |
| CN101117657A (en) * | 2007-08-29 | 2008-02-06 | 太仓市金鑫铜管有限公司 | Bright annealing furnace |
| CN101559446A (en) * | 2009-05-25 | 2009-10-21 | 广州永大不锈钢有限公司 | Method for preparing welded stainless steel pipe of boiler |
| CN201442966U (en) * | 2009-07-03 | 2010-04-28 | 山东荣泰电炉制造有限公司 | Thin-wall stainless steel tube solid solution heat treatment device |
| CN101787418A (en) * | 2010-03-15 | 2010-07-28 | 长沙电机厂有限责任公司 | Metal material continuous- molding on-line anti-oxidation method and device thereof |
| CN201825987U (en) * | 2010-09-27 | 2011-05-11 | 上海宇洋特种金属材料有限公司 | Novel sealing device for high-temperature resistant protective gas |
| CN103710644A (en) * | 2014-01-23 | 2014-04-09 | 江苏银环精密钢管股份有限公司 | Stainless steel seamless steel tube for sulfuric acid waste heat recovery device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104393118B (en) | The crystal silicon solar batteries Wet chemical processing method that making herbs into wool is carried out with cleaning substep | |
| US3806366A (en) | Continuous pickling of cast rod | |
| JP5821987B2 (en) | Heat treatment apparatus and heat treatment method | |
| CN106498136B (en) | A kind of device of high-pressure liquid or above-critical state quenching | |
| CN107363034A (en) | A kind of silico briquette cleaning drying device | |
| CN109097534B (en) | Very thin precise stainless steel strip busbar bright annealing technology | |
| CN107738370A (en) | A kind of polysilicon chip preparation technology | |
| CN207852624U (en) | A kind of polycrystalline silicon texturing cleaning machine | |
| CN105220235B (en) | A kind of single polycrystalline etching method | |
| CN117139395B (en) | Surface cleaning process and cleaning device for alloy copper strip production | |
| CN106435124A (en) | Technique for producing shining stainless steel pipe | |
| CN105864630B (en) | High-purity ammon charging system and fill the methods for filling of high-purity ammon using it | |
| CN206783771U (en) | A kind of strip spray does the wash the closed descaling bath of formula | |
| CN107090582A (en) | A kind of bite method detected for the grinding burn of bearing parts surface | |
| WO2024011965A1 (en) | Multifunctional strip treatment system, and method for using same | |
| JPS61217531A (en) | Cooling method for steel strip | |
| CN211578706U (en) | Chain type alkali-acid simultaneous polishing equipment | |
| CN206345881U (en) | A kind of device of high-pressure liquid or above-critical state quenching | |
| CN108467000A (en) | A method of replace carbon dioxide to carry out beer filling using nitrogen | |
| CN208562525U (en) | A kind of stainless steel bearing passivation cleaning device | |
| CN115956009A (en) | Method for machining steel sheet | |
| CN210136844U (en) | Chain type alkali polishing production line for crystalline silicon battery piece | |
| CN113751961A (en) | Production process of stainless steel pipe with ultrahigh cleanliness | |
| JP2013252984A (en) | Chemical polishing device | |
| CN112553451A (en) | Continuous stress relief annealing process for cold-rolled stainless steel strip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170222 |
|
| RJ01 | Rejection of invention patent application after publication |