CN105734393A - Production method for non-oriented electrical steel - Google Patents
Production method for non-oriented electrical steel Download PDFInfo
- Publication number
- CN105734393A CN105734393A CN201610233558.3A CN201610233558A CN105734393A CN 105734393 A CN105734393 A CN 105734393A CN 201610233558 A CN201610233558 A CN 201610233558A CN 105734393 A CN105734393 A CN 105734393A
- Authority
- CN
- China
- Prior art keywords
- steel
- rolling
- production
- calcium
- electrical steel
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
Abstract
The invention discloses a production method for non-oriented electrical steel. The production method comprises the working procedures of converter smelting, RH refining, heating and rolling; in the RH refining working procedure, when alloying is carried out, calcium-containing silicon iron or a calcium-containing alloy is added to conduct micro-calcium treatment, and the content of calcium in the steel ranges from 10 ppm to 30 ppm; in the heating working procedure, the highest heating temperature is not higher than 1170 DEG C; and in the rolling working procedure, the roughing RDT temperature is controlled to range from 970 DEG C to 990 DEG C. According to the method, the RH completely rises directly, the LF temperature rise link of the technological process is omitted, the process is smoothened, and therefore the production cost is reduced; according to the method, sequence continuous casting stabilized production of the electrical steel is achieved, the highest continuous casting number is larger than 15, and most economical production within the service life of a middle ladle is achieved; according to the method, the oxidation iron sheet structure of the surface of an obtained steel belt is effectively improved, the surface quality is greatly improved, and the stage of the surface of the steel belt obtained after cold rolling is improved; and by means of the method, mixed rolling between the electrical steel and a common product is achieved, and the yield of a production line is released to the maximum degree.
Description
Technical field
The invention belongs to field of steel metallurgy, the production method of especially a kind of non-oriented electrical steel.
Background technology
Adopting sheet bar process to produce non-oriented electrical steel and obtained tremendous development, domestic many sheet billets produce low code non-oriented electrical steel in can successfully producing, but production stability all has much room for improvement.Being primarily present following problems in non-oriented electrical steel production process: 1, due to a variety of causes, different producers defines different production process routes, and the LF+RH duplex that need to adopt aborning having produces, and causes technique to repeat, and cost is wasted；2, electrical sheet belongs to high-silicon high aluminum steel, and castability is poor, be difficult to sequence casting so that production stability is poor, cost is high；3, general hot rolling mill adopts the production model of the corresponding rolling line of two casting machines, when electrical sheet contract is not extremely sufficient, adopts single line to produce, largely effects on the performance producing line production capacity, increase ton steel cost；4, electrical sheet due to silicone content higher, surface is easily formed silicon olivine class iron scale, it is difficult to pickling remove, affect steel strip surface quality.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of can the production method of non-oriented electrical steel of stable mass production.
For solving above-mentioned technical problem, the technical solution used in the present invention is: it includes converter smelting, RH refine, heating and rolling process；Add calcic ferrosilicon when described RH refining procedure carries out alloying or calcium containing alloy carries out micro-Calcium treatment, control calcium content 10～30ppm in steel；Described heating process, maximum heating temperature is not higher than 1170 DEG C；Described rolling process, roughing RDT temperature controls at 970～990 DEG C.
Converter smelting operation of the present invention, tapping temperature is more than 1680 DEG C.
Heating process of the present invention, adopts weak oxide atmosphere.
Adopt produced by technique scheme and have the beneficial effects that: the present invention adopt RH completely straight on, reduce the LF intensification link of technological process, made technique in order, reduced production cost；Present invention achieves the sequence casting steady production of electrical sheet, the highest company waters and reaches 15 stoves, it is achieved that most economical production in the middle bag life-span (general traditional handicraft casting sequence be 6～8 stoves often water time)；Gained steel strip surface scale structure of the present invention is effectively improved, and surface quality is greatly improved, and improves the surface grade after cold rolling band steel.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the surface picture of non-oriented electrical steel hot rolled steel plate of the present invention；
Fig. 2 is conventional method gained non-oriented electrical steel surface of steel plate photo.
Detailed description of the invention
The production method of this non-oriented electrical steel includes converter smelting, RH refine, heating and rolling process, the production of low code non-oriented electrical steel suitable in W1300～W600, the processing step of each operation is: (1) converter smelting: converter adopts high temperature tapping, and tapping temperature is more than 1680 DEG C.
(2) RH refining procedure: do not walk LF after the tapping of converter smelting operation and heat up, adopts RH directly to go up technique, makes technological process in order, reduce cost；Adding calcic ferrosilicon or calcium containing alloy when RH carries out alloying and carry out micro-Calcium treatment, control calcium content 10～30ppm in steel, the controlled quentity controlled variable of calcium is separately watered and is normally connected and waters that to control content different, is effectively improved pourability of molten steel.
(3) heating process: controlling heating furnace and be heated to be weak oxide atmosphere (oxygen content is 2～5wt%), calorific value controls at 2600～2900kcal/m3, in stove, each section of maximum heating temperature is not higher than 1170 DEG C, controls roughing RDT temperature at 970～990 DEG C, effectively controls steel strip surface scale structure, is beneficial to iron scale pickling and removes.
(4) rolling process: set up the mixed rolling model of electrical sheet and straight carbon steel SS400 or cold rolling material SPHC, it is achieved electrical sheet and the mixed rolling of different in width specification SS400 or SPHC, discharges and produces line production capacity.
Fig. 1 is the surface picture of this method gained non-oriented electrical steel steel plate, and Fig. 2 is the surface picture of conventional method gained non-oriented electrical steel steel plate；From Fig. 1,2, this method can efficiently reduce the generation of scale on surface, and surface quality and surface grade are greatly improved.
Embodiment 1: the production method of this non-oriented electrical steel adopts following concrete technology.
(1) converter smelting: tapping temperature 1695 DEG C, tap oxygen position 654ppm.
(2) RH refining procedure: carry out alloying by the component requirements of electrical sheet W800；Add calcic ferrosilicon when RH carries out alloying and carry out micro-Calcium treatment, control calcium content 15～25ppm in steel.
(3) heating process: controlling heating furnace and be heated to be weak oxide atmosphere, calorific value controls at 2600～2900kcal/m3, each section of maximum heating temperature 1150 DEG C in stove, control roughing RDT temperature at 990 DEG C.
(4) rolling process: the cold rolling material SPHC of 1215mm width electrical sheet W800 and 1250mm carries out mixed rolling.
Watering secondary company and water 14 stoves, stable production process, steel strip surface quality is good.The electrical sheet width range 1215～1230mm of rolling, thickness deviation ± 0.08mm, convexity≤30 μm, steel band does not have obvious shape wave；Rolling SPHC width range: 1250～1268mm, thickness deviation ± 0.10mm, convexity≤40 μm.Cold rolling material mechanical performance meets standard-required, and the electromagnetic performance of gained electrical sheet W800 is as shown in table 1.
Table 1: the electromagnetic performance of gained electrical sheet W800
| Heat | P1.5/50(W/kg) | B50/50(T) |
| 1 | 4.613 | 1.725 |
| 2 | 4.761 | 1.728 |
| 3 | 4.770 | 1.729 |
| 4 | 4.640 | 1.726 |
| 5 | 4.911 | 1.727 |
| 6 | 4.608 | 1.729 |
| 7 | 4.617 | 1.727 |
| 8 | 4.591 | 1.729 |
| 9 | 4.756 | 1.733 |
| 10 | 4.815 | 1.747 |
| 11 | 4.551 | 1.729 |
| 12 | 4.525 | 1.729 |
| 13 | 4.494 | 1.738 |
| 14 | 4.662 | 1.732 |
Embodiment 2: the production method of this non-oriented electrical steel adopts following concrete technology.
(1) converter smelting: tapping temperature 1700 DEG C, tap oxygen position 680ppm.
(2) RH refining procedure: carry out alloying by the component requirements of electrical sheet W800；Add calcic ferrosilicon when RH carries out alloying and carry out micro-Calcium treatment, control calcium content 13～28ppm in steel.
(3) heating process: controlling heating furnace and be heated to be weak oxide atmosphere, calorific value controls at 2600～2900kcal/m3, each section of maximum heating temperature 1165 DEG C in stove, control roughing RDT temperature at 980 DEG C.
(4) rolling process: 1215mm width electrical sheet W800 and 1500mm straight carbon steel SS400 carries out mixed rolling.
Watering secondary company and water 15 stoves, stable production process, steel strip surface quality is good.The electrical sheet width range 1215～1232mm of rolling, thickness deviation ± 0.10mm, convexity≤30 μm, steel band does not have obvious shape wave；Rolling SS400 width range: 1500～1520mm, thickness deviation ± 0.12mm, convexity≤50 μm.The electromagnetic performance of gained electrical sheet W800 is as shown in table 2.
Table 2: the electromagnetic performance of gained electrical sheet W800
| Heat | P1.5/50(W/kg) | B50/50(T) |
| 1 | 4.835 | 1.735 |
| 2 | 4.837 | 1.732 |
| 3 | 4.638 | 1.734 |
| 4 | 4.961 | 1.728 |
| 5 | 4.621 | 1.73 |
| 6 | 4.744 | 1.74 |
| 7 | 4.666 | 1.734 |
| 8 | 4.779 | 1.737 |
| 9 | 4.73 | 1.741 |
| 10 | 4.6 | 1.726 |
| 11 | 4.76 | 1.739 |
| 12 | 4.55 | 1.737 |
| 13 | 4.67 | 1.737 |
| 14 | 4.88 | 1.736 |
| 15 | 4.78 | 1.74 |
Embodiment 3: the production method of this non-oriented electrical steel adopts following concrete technology.
(1) converter smelting: tapping temperature 1685 DEG C, tap oxygen position 672ppm.
(2) RH refining procedure: carry out alloying by the component requirements of electrical sheet W600；Add calcic ferrosilicon when RH carries out alloying and carry out micro-Calcium treatment, control calcium content 10～20ppm in steel.
(3) heating process: controlling heating furnace and be heated to be weak oxide atmosphere, calorific value controls at 2600～2900kcal/m3, each section of maximum heating temperature 1160 DEG C in stove, control roughing RDT temperature at 970 DEG C.
(4) rolling process: the cold rolling material SPHC of 1215mm width electrical sheet W600 and 1250mm carries out mixed rolling.
Watering secondary company and water 15 stoves, stable production process, steel strip surface quality is good.The electrical sheet width range 1215～1230mm of rolling, thickness deviation ± 0.09mm, convexity≤30 μm, steel band does not have obvious shape wave；Rolling SPHC width range: 1252～1270mm, thickness deviation ± 0.10mm, convexity≤44 μm.Cold rolling material mechanical performance meets standard-required, and the electromagnetic performance of gained electrical sheet W600 is as shown in table 3.
Table 3: the electromagnetic performance of gained electrical sheet W600
| Heat | P1.5/50(W/kg) | B50/50(T) |
| 1 | 3.891 | 1.707 |
| 2 | 3.844 | 1.713 |
| 3 | 3.95 | 1.714 |
| 4 | 3.972 | 1.71 |
| 5 | 4.125 | 1.698 |
| 6 | 4.114 | 1.703 |
| 7 | 4.071 | 1.709 |
| 8 | 4.071 | 1.711 |
| 9 | 4.15 | 1.711 |
| 10 | 4.143 | 1.713 |
| 11 | 4.129 | 1.71 |
| 12 | 4.284 | 1.705 |
| 13 | 4.2 | 1.715 |
| 14 | 4.143 | 1.716 |
| 15 | 4.178 | 1.716 |
Embodiment 4: the production method of this non-oriented electrical steel adopts following concrete technology.
(1) converter smelting: tapping temperature 1682 DEG C, tap oxygen position 665ppm.
(2) RH refining procedure: carry out alloying by the component requirements of electrical sheet W1300；Add calcic ferrosilicon when RH carries out alloying and carry out micro-Calcium treatment, control calcium content 20～30ppm in steel.
(3) heating process: controlling heating furnace and be heated to be weak oxide atmosphere, calorific value controls at 2600～2900kcal/m3, each section of maximum heating temperature 1170 DEG C in stove, control roughing RDT temperature at 982 DEG C.
(4) rolling process: 1215mm width electrical sheet W1300 and 1500mm straight carbon steel SS400 carries out mixed rolling.
Watering secondary company and water 14 stoves, stable production process, steel strip surface quality is good.The electrical sheet width range 1215～1230mm of rolling, thickness deviation ± 0.80mm, convexity≤30 μm, steel band does not have obvious shape wave；Rolling SS400 width range: 1500～1520mm, thickness deviation ± 0.11mm, convexity≤48 μm.The electromagnetic performance of gained electrical sheet W1300 is as shown in table 4.
Table 4: the electromagnetic performance of gained electrical sheet W1300
| Heat | P1.5/50(W/kg) | B50/50(T) |
| 1 | 5.123 | 1.755 |
| 2 | 5.032 | 1.756 |
| 3 | 5.210 | 1.761 |
| 4 | 5.045 | 1.753 |
| 5 | 4.911 | 1.748 |
| 6 | 5.205 | 1.757 |
| 7 | 5.263 | 1.761 |
| 8 | 5.089 | 1.754 |
| 9 | 5.134 | 1.756 |
| 10 | 5.224 | 1.750 |
| 11 | 5.068 | 1.749 |
| 12 | 5.146 | 1.753 |
| 13 | 5.185 | 1.756 |
| 14 | 5.149 | 1.758 |
Claims (3)
1. the production method of a non-oriented electrical steel, it is characterised in that: it includes converter smelting, RH refine, heating and rolling process；Add calcic ferrosilicon when described RH refining procedure carries out alloying or calcium containing alloy carries out micro-Calcium treatment, control calcium content 10～30ppm in steel；Described heating process, maximum heating temperature is not higher than 1170 DEG C；Described rolling process, roughing RDT temperature controls at 970～990 DEG C.
2. the production method of a kind of non-oriented electrical steel according to claim 1, it is characterised in that: described converter smelting operation, tapping temperature is more than 1680 DEG C.
3. the production method of a kind of non-oriented electrical steel according to claim 1 and 2, it is characterised in that: described heating process, adopt weak oxide atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610233558.3A CN105734393A (en) | 2016-04-15 | 2016-04-15 | Production method for non-oriented electrical steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610233558.3A CN105734393A (en) | 2016-04-15 | 2016-04-15 | Production method for non-oriented electrical steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105734393A true CN105734393A (en) | 2016-07-06 |
Family
ID=56254383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610233558.3A Pending CN105734393A (en) | 2016-04-15 | 2016-04-15 | Production method for non-oriented electrical steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105734393A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106493177A (en) * | 2016-10-31 | 2017-03-15 | 武汉钢铁股份有限公司 | A kind of different in width specification strip steel mixed rolling method based on CSP techniques |
| CN108642239A (en) * | 2018-05-14 | 2018-10-12 | 北京科技大学 | The method for carrying out molten steel alloying with silicon and Calcium treatment using calcium ferro-silicon alloy containing metal |
| CN110578036A (en) * | 2019-09-26 | 2019-12-17 | 湖南华菱涟钢薄板有限公司 | RH refining method and smelting process of aluminum-containing electrical steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001348652A (en) * | 2000-06-07 | 2001-12-18 | Nkk Corp | Nonoriented silicon steel sheet and its production method |
| CN102758150A (en) * | 2011-04-28 | 2012-10-31 | 宝山钢铁股份有限公司 | High-yield-strength non-oriented electrical steel plate and manufacturing method thereof |
| CN103305659A (en) * | 2012-03-08 | 2013-09-18 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate with excellent magnetism and calcium treatment method thereof |
| CN103388106A (en) * | 2013-06-27 | 2013-11-13 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate with high magnetic induction and low iron loss, and manufacturing method thereof |
| CN105132808A (en) * | 2015-10-14 | 2015-12-09 | 安徽工业大学 | Method for preparing compound element processed non-oriented silicon steel for high-efficiency motor |
-
2016
- 2016-04-15 CN CN201610233558.3A patent/CN105734393A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001348652A (en) * | 2000-06-07 | 2001-12-18 | Nkk Corp | Nonoriented silicon steel sheet and its production method |
| CN102758150A (en) * | 2011-04-28 | 2012-10-31 | 宝山钢铁股份有限公司 | High-yield-strength non-oriented electrical steel plate and manufacturing method thereof |
| CN103305659A (en) * | 2012-03-08 | 2013-09-18 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate with excellent magnetism and calcium treatment method thereof |
| CN103388106A (en) * | 2013-06-27 | 2013-11-13 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate with high magnetic induction and low iron loss, and manufacturing method thereof |
| CN105132808A (en) * | 2015-10-14 | 2015-12-09 | 安徽工业大学 | Method for preparing compound element processed non-oriented silicon steel for high-efficiency motor |
Non-Patent Citations (2)
| Title |
|---|
| 《刘玠文集》编辑小组: "《刘玠文集》", 31 May 2014, 冶金工业出版社 * |
| 松本吉弘 编，李兴烈 等译: "《计算机控制系统》", 31 March 1985, 冶金工业出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106493177A (en) * | 2016-10-31 | 2017-03-15 | 武汉钢铁股份有限公司 | A kind of different in width specification strip steel mixed rolling method based on CSP techniques |
| CN106493177B (en) * | 2016-10-31 | 2018-06-26 | 武汉钢铁有限公司 | A kind of different in width specification strip steel mixed rolling method based on CSP techniques |
| CN108642239A (en) * | 2018-05-14 | 2018-10-12 | 北京科技大学 | The method for carrying out molten steel alloying with silicon and Calcium treatment using calcium ferro-silicon alloy containing metal |
| CN110578036A (en) * | 2019-09-26 | 2019-12-17 | 湖南华菱涟钢薄板有限公司 | RH refining method and smelting process of aluminum-containing electrical steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103160729B (en) | Medium-carbon microalloyed steel for engineering machinery caterpillar chain piece and production process thereof | |
| CN101962734B (en) | Steel for ball mill steel ball and preparation method thereof | |
| CN110565012B (en) | Continuous casting manufacturing method of ultra-high chromium ferrite stainless steel | |
| CN110616381A (en) | Austenite grain size refinement control method of high-temperature carburized gear steel | |
| CN104032214A (en) | Non-quenched and tempered steel and production technology | |
| CN104988422A (en) | Extremely-thick hardening and tempering high-strength steel plate for water and electricity and production method thereof | |
| CN105112804A (en) | AISI410SS martensite stainless steel for valve and preparation process of AISI410SS martensite stainless steel | |
| CN104294155A (en) | Ultra-low carbon oriented silicon steel and preparation method thereof | |
| CN110284049A (en) | A kind of secondary refining method for improving ultra-deep and rushing cold rolling glassed steel casting sequence | |
| CN105734393A (en) | Production method for non-oriented electrical steel | |
| CN103627955A (en) | Steel for high-carbon wear-resisting ball material and production method thereof | |
| CN103710620A (en) | Large-thickness steel plate for low-temperature pressure container and production process thereof | |
| CN106834959A (en) | High hardness wear-resisting ball material steel and its production method | |
| CN109518079A (en) | A kind of production method of hydrogen-contacting equipment 15CrMoR steel plate | |
| CN108950381A (en) | Normalizing type marine engineering equipment special thick low-alloy high strength steel plate and its production method | |
| CN102277532A (en) | Cold working mold steel Cr8 and production method thereof | |
| CN103695601B (en) | Processing method of molten steel used for checkered plate smelted in converter | |
| CN104357761A (en) | Sulfur-containing free-cutting die steel smelting technique | |
| CN103774040B (en) | PSB830 finish rolling deformed bar and hot metal containing V-Ti smelt the technique of this reinforcing bar | |
| CN102758128A (en) | Method for producing deep-draw hot-rolled strip steel by micro carbon aluminium killed steel | |
| CN103966526A (en) | Steel plate for large-wall-thickens oil-gas transmission pipe fitting tee and production method of steel plate | |
| CN102211155B (en) | Calcium treatment method of low-carbon low silicon aluminium killed steels under CSP (Cast Steel Plate) condition | |
| CN103643127B (en) | The production method of 500MPa level hydrogen-contacting equipment Plate Steel | |
| CN102747274A (en) | Vanadium-boron microalloyed waste heat treatment reinforced bar steel and production technique thereof | |
| CN105154779B (en) | A kind of seamless steel tube for nuclear power and preparation method thereof |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160706 |