CN106399627A - Core-spun yarn high-titanium titanium-silicon nitride alloy powder - Google Patents
Core-spun yarn high-titanium titanium-silicon nitride alloy powder Download PDFInfo
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- CN106399627A CN106399627A CN201611015749.9A CN201611015749A CN106399627A CN 106399627 A CN106399627 A CN 106399627A CN 201611015749 A CN201611015749 A CN 201611015749A CN 106399627 A CN106399627 A CN 106399627A
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- titanium
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- spun yarn
- steel
- silicon nitride
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- 239000010936 titanium Substances 0.000 title claims abstract description 33
- 239000000843 powder Substances 0.000 title claims abstract description 26
- 229910052581 Si3N4 Inorganic materials 0.000 title claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 21
- 239000000956 alloy Substances 0.000 title claims abstract description 21
- 229910052719 titanium Inorganic materials 0.000 title abstract description 13
- UGACIEPFGXRWCH-UHFFFAOYSA-N [Si].[Ti] Chemical compound [Si].[Ti] UGACIEPFGXRWCH-UHFFFAOYSA-N 0.000 title abstract description 11
- WKORWMLYJIMJKA-UHFFFAOYSA-N [Si][Ti][Ti] Chemical compound [Si][Ti][Ti] WKORWMLYJIMJKA-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 abstract description 12
- 238000011084 recovery Methods 0.000 abstract description 9
- 229910000742 Microalloyed steel Inorganic materials 0.000 abstract description 7
- 229910000616 Ferromanganese Inorganic materials 0.000 abstract description 6
- 229910000519 Ferrosilicon Inorganic materials 0.000 abstract description 6
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 42
- 239000010959 steel Substances 0.000 description 42
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 22
- 229910052742 iron Inorganic materials 0.000 description 15
- 229910052757 nitrogen Inorganic materials 0.000 description 13
- 239000002245 particle Substances 0.000 description 12
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 11
- 239000013078 crystal Substances 0.000 description 11
- 238000005266 casting Methods 0.000 description 9
- 229910000859 α-Fe Inorganic materials 0.000 description 9
- 229910001566 austenite Inorganic materials 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000001556 precipitation Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000004044 response Effects 0.000 description 6
- 238000005275 alloying Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000001953 recrystallisation Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- -1 alterant Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- B22F1/0003—
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
-
- 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
Abstract
The invention relates to core-spun yarn alloy powder, in particular to core-spun yarn high-titanium titanium-silicon nitride alloy powder which comprises the following element components in percentage by mass: 1.0-2.5% of Al, 5-15% of N, 2.5-5.0% of Mn, 1.0-2.5% of Mg, 40-60% of Ti, less than or equal to 0.1% of P, less than or equal to 0.1% of S, 35-50% of Si and the balance Fe. The alloy powder is added into micro-alloyed steel through a method of adopting a core-spun yarn, so that the problem that a recovery rate is low can be solved, and usage amount of ferrosilicon and ferromanganese further can be saved; and application of titanium-silicon nitride and core-spun yarn alloy thereof is developed, and economic benefits are remarkable.
Description
Technical field
The present invention relates to a kind of core-spun yarn alloyed powder.
Background technology
China is big steel country, but the ratio shared by the quantity of high-quality steel and kind is less, not only can not meet China's warp
Ji builds the requirement with national defense construction, and the waste of resource is quite serious, and the cost causing smelting iron and steel is continuously increased.Solution
Certainly the fundamental way of the problems referred to above is, the novel metallurgical subject micro-alloying technology being occurred using 20 century 70s, that is, exist
Micro (0.001%-0.1%) alloying element is added in steel, just can be to the performance of steel (such as high intensity, high tenacity, good solderable
Property and corrosion resistance) reach significant improvement, save valuable alloying element, with reduces cost, this is traditional iron and steel simultaneously
Produce the important symbol to modern production conversion.After the nineties in 20th century, the main iron and steel manufacturing country of China and the world is made in succession
Development plan that is fixed and implementing New Generation Steel PRODUCTION TRAITS, super fine organization, high-cleanness, high, the micro alloyed steel of high evenness become
Main Trends of The Development for ferrous materials.At present, micro alloyed steel accounts for the total ratio of steel, and world average level is about 15%,
Industrialized country reaches 30%, and China is less than 5%, and therefore China's urgent need micro-alloying technology transforms the original low-alloy of China
High-strength steel system, and micro alloyed steel kind and the Iron ＆ Steel Material of New Generation that exploitation is badly in need of is combined with controlled rolling and controlled cooling.
Core-spun yarn is to be intended to add the various additives (deoxidizer, desulfurizing agent, alterant, alloy etc.) in molten steel or iron liquid
It is broken into certain granularity, then included for a composite with random length with cold-rolled low carbon steel band.Cored
Line technology is a kind of external refining means growing up on the basis of spraying metallurgy technology the eighties.Core-spun yarn is applied to steel-making
And casting.Steel inclusion morphology can be purified for steel-making, improve molten steel castability, improve the serviceability of steel, and can significantly carry
Low alloy-consumption, drops in heavy alloyed recovery rate, reduces steel-making cost, remarkable in economical benefits.
Titanium silicon nitride core-spun yarn is new composite core-spun yarn in screw-thread steel wire production.Addition from the refine later stage, can
Improve the recovery rate of nitrogen in steel titanium, reduce other ferroalloy consumptions, there is significant economic benefit.Due to titanium silicon nitride alloy
Proportion kicks the beam（In high titanium titanium silicon nitride alloy, iron content is lower by more than 30% than ferro-titanium）, in adition process, swim in molten steel
Surface and be combined oxidized with slag, cause the recovery rate of titanium relatively low（Average out to 27%）, Ti content 0.0038% in steel, reach not
Require to internal quality control.And high titanium titanium silicon nitride alloy feeds in steel at Argon station by the form of core-spun yarn, on the one hand permissible
It is that alloy rapidly enters molten steel, it is to avoid alloy is aoxidized by slag in molten steel；On the other hand, through the molten steel oxygen of furnace rear deoxidation treatment
The property changed is low, it is possible to reduce the scaling loss of titanium, thus improving and stablizing the response rate in steel for the titanium.
The application for a patent for invention of applicant's application（Application number：201510160282.6, applying date 2015.04.07）Open
A kind of titanium silicon nitride core-spun yarn, including sandwich layer be wrapped in sheetmetal layer described sandwich layer outside, described sandwich layer is titanium silicon nitride
Alloy-layer, is provided with the mesh-supported layer that steel or ferrum are made, described titanium silicon nitride alloy-layer is by grain between described sandwich layer and sheetmetal layer
Footpath is the titanium silicon nitride alloying pellet composition of below 3mm.Carbon in the Ti of this invention and steel or nitrogen form a size of nano level
Compound, they are best to the thinning effect of tissue, improve the intensity of ferrous materials, nitrogen pick-up improves the stability of TiN granule, more
Effectively stop Austenite Grain Growth.Make full use of cheap nitrogen, under ensureing certain intensity level, titanium can be saved
Addition, further reduce non-hardened and tempered steel cost.
Content of the invention
It is an object of the invention to provide a kind of high titanium titanium silicon nitride alloyed powder of core-spun yarn, this alloyed powder is by adopting core-spun yarn
Method can not only solve the problems, such as that the response rate is low to be added in micro alloyed steel, and ferrosilicon, ferromanganese can also be saved
Usage amount, exploitation titanium silicon nitride and its core-spun yarn Alloyapplication, have significant economic benefit.
In order to realize above-mentioned purpose, present invention employs following technical scheme：
A kind of high titanium titanium silicon nitride alloyed powder of core-spun yarn, this alloy powder is made up of elements below component by mass percentage：
Al 1.0 ~ 2.5%,
N 5 ~ 15%,
Mn 2.5 ~ 5.0%,
Mg 1.0 ~ 2.5%,
Ti 40 ~ 60%,
P≤0.1%,
S≤0.1%,
Si 35~50%；
Fe surplus.
Preferably, this alloy powder is made up of elements below component by mass percentage：
Al 1.5~2.0%
N 8~12%
Mn 3.0~4.0%
Mg 1.5~2.0%
Ti 45~55%
P ≤0.1%
S ≤0.1%
Si 40~45%；
Fe surplus.
Preferably, the granularity of this alloy powder is 0.1 ~ 2.0mm.
The present invention chooses sponge iron and titanium sponge and ferrosilicon and ferromanganese is smelted in a vacuum furnace.In certain process conditions
Under, nitrogenized, make nitridation reach optimum efficiency（Regulation content）, then pour into ingot casting.Ingot casting becomes certain particle size through broken essence,
It is overmolding to a diameter of 13 millimeters of core-spun yarn using iron sheet.This kind of core-spun yarn is inserted into steel in the refine later stage with certain payingoff speed
In liquid, in final steel, Ti content averagely reaches the recovery rate average 60% of average 55%, the Si of the response rate of 0.008%, Ti.
Core-spun yarn using the present invention high titanium titanium silicon nitride alloyed powder is new composite core-spun yarn during iron and steel produces, in essence
Addition from the refining later stage, can improve the recovery rate of nitrogen in steel titanium silicon, reduce other ferroalloy consumptions, have significant economic benefit.
Its reason is carbon or the nitrogen a size of nano level compound of formation in Ti and steel, their strong obstructions of having grown up to crystal grain
Effect, and when the volume fraction shared by this nano level compound is 2%, best to the thinning effect of tissue.
Alloyed powder of the present invention is added in micro alloyed steel by the method using core-spun yarn, has the characteristics that following：
1) when stoping soaking, austenite crystal grows up：When the micro alloyed steels such as Ti heat with soaking before forging or rolling, not molten
The migration of the microalloy carbonitride Pinning austenite grain boundary of solution, stops its crystal grain from being grown up, thus makes micro alloyed steel in pressure
Just possess less austenite crystal before power processing, provide favourable condition for further fining ferrite grains.
2) stop austenite recrystallization during ausforming：During ausforming, analysed by strain inducing
The carbonitride precipitates of the Ti going out can suppress the growing up of crystal grain after deformed austeaite recrystallization and recrystallization, plays crystal grain thinning
Effect.Because the carbonitride particle preferential precipitation of the microalloy element of strain induced precipitate is in austenite crystal in hot procedure
On boundary, sub boundary and dislocation line, so as to the effective motion stoping crystal boundary, sub boundary and dislocation, its effect can not only stop
The beginning of recrystallization process, and the carrying out of recrystallization process can also be suppressed.
3) precipitation enhancement after ferrite transformation：After ausforming, ferrite transformation will occur, at this moment will have big
The disperse microalloy carbonitride particle of amount separates out, and the particle that these separate out equally also plays pinning effect to ferrite crystal grain, limit
Make it to grow up.On the other hand, these particles also play precipitation enhancement, improve the intensity of ferrous materials.
4）The size of microalloy Carbonitride Precipitation particle and its volume fraction play a decisive role to ferrite grain size,
Precipitation particles is less, and volume fraction is bigger, and the ferrite crystal grain being obtained is also less.Thus, make great efforts to make precipitation particles have
Larger volume fraction and less size are the big targets in grain refinement process, are also the direction of invention simultaneously.Adding
While entering these rare elements, nitrogen pick-up simultaneously, because changing Ti after nitrogen pick-up in alternate distribution, promote Ti (C, N
) separate out, so that the particle size of precipitated phase is obviously reduced, thus enhancing the precipitation enhancement of titanium, increasing substantially steel
Intensity.Nitrogen passes through to promote Ti (C, N) to separate out, and pinning austenite ferrite crystal boundary effectively has refined ferrite brilliant
Grain.Nitrogen pick-up may additionally facilitate the formation of Intragranular Acicular Ferrite, has refined ferritic structure further.To Trace Titanium Treatment non-hardened and tempered steel,
Nitrogen pick-up improves the stability of TiN granule, more effectively stops Austenite Grain Growth.Make full use of cheap nitrogen,
Ensure, under certain intensity level, the addition of vanadium can be saved, reduce the cost of non-hardened and tempered steel further.
Specific embodiment
Embodiment 1
A kind of high titanium titanium silicon nitride alloyed powder of core-spun yarn, this alloy powder is made up of elements below component by mass percentage：
Al 2.0%
N 10%
Mn 4.0%
Mg 2.0%
Ti 40%
P ≤0.1%
S ≤0.1%
Si 35%；
Fe surplus.
The present invention chooses sponge iron and titanium sponge and ferrosilicon and ferromanganese is smelted in a vacuum furnace.In certain process conditions
Under, nitrogenized, make nitridation reach optimum efficiency（Regulation content）, then pour into ingot casting.Ingot casting becomes certain particle size through broken essence,
It is overmolding to a diameter of 13 millimeters of core-spun yarn using iron sheet.This kind of core-spun yarn is inserted into steel in the refine later stage with certain payingoff speed
In liquid, in final steel, Ti content averagely reaches the recovery rate average 60% of average 55%, the Si of the response rate of 0.008%, Ti.
Embodiment 2
A kind of high titanium titanium silicon nitride alloyed powder of core-spun yarn, this alloy powder is made up of elements below component by mass percentage：
Al 1.0%
N 15%
Mn 4.0%
Mg 1.0%
Ti 50%
P ≤0.1%
S ≤0.1%
Si 35%；
Fe surplus.
The present invention chooses sponge iron and titanium sponge and ferrosilicon and ferromanganese is smelted in a vacuum furnace.In certain process conditions
Under, nitrogenized, make nitridation reach optimum efficiency（Regulation content）, then pour into ingot casting.Ingot casting becomes certain particle size through broken essence,
It is overmolding to a diameter of 13 millimeters of core-spun yarn using iron sheet.This kind of core-spun yarn is inserted into steel in the refine later stage with certain payingoff speed
In liquid, in final steel, Ti content averagely reaches the recovery rate average 60% of average 55%, the Si of the response rate of 0.008%, Ti.
Embodiment 3
A kind of high titanium titanium silicon nitride alloyed powder of core-spun yarn, this alloy powder is made up of elements below component by mass percentage：
Al 2.5%
N 5%
Mn 2.5%
Mg 2.0%
Ti 50%
P ≤0.1%
S ≤0.1%
Si 35%；
Fe surplus.
The present invention chooses sponge iron and titanium sponge and ferrosilicon and ferromanganese is smelted in a vacuum furnace.In certain process conditions
Under, nitrogenized, make nitridation reach optimum efficiency（Regulation content）, then pour into ingot casting.Ingot casting becomes certain particle size through broken essence,
It is overmolding to a diameter of 13 millimeters of core-spun yarn using iron sheet.This kind of core-spun yarn is inserted into steel in the refine later stage with certain payingoff speed
In liquid, in final steel, Ti content averagely reaches the recovery rate average 60% of average 55%, the Si of the response rate of 0.008%, Ti.
Claims (3)
1. a kind of high titanium titanium silicon nitride alloyed powder of core-spun yarn is it is characterised in that this alloy powder is by mass percentage by following unit
Plain component is constituted：
Al 1.0 ~ 2.5%,
N 5 ~ 15%,
Mn 2.5 ~ 5.0%,
Mg 1.0 ~ 2.5%,
Ti 40 ~ 60%,
P≤0.1%,
S≤0.1%,
Si 35~50%；
Fe surplus.
2. a kind of high titanium titanium silicon nitride alloyed powder of core-spun yarn according to claim 1 is it is characterised in that this alloy powder is pressed
Mass percent is made up of elements below component：
Al 1.5 ~ 2.0%,
N 8 ~ 12%,
Mn 3.0 ~ 4.0%,
Mg 1.5 ~ 2.0%,
Ti 45 ~ 55%,
P≤0.1%,
S≤0.1%,
Si 40~45%；
Fe surplus.
3. the high titanium titanium silicon nitride alloyed powder of a kind of core-spun yarn according to claim 1 and 2 is it is characterised in that this alloy powder
Granularity be 0.1 ~ 2.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015749.9A CN106399627A (en) | 2016-11-18 | 2016-11-18 | Core-spun yarn high-titanium titanium-silicon nitride alloy powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611015749.9A CN106399627A (en) | 2016-11-18 | 2016-11-18 | Core-spun yarn high-titanium titanium-silicon nitride alloy powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106399627A true CN106399627A (en) | 2017-02-15 |
Family
ID=58068873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611015749.9A Withdrawn CN106399627A (en) | 2016-11-18 | 2016-11-18 | Core-spun yarn high-titanium titanium-silicon nitride alloy powder |
Country Status (1)
| Country | Link |
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| CN (1) | CN106399627A (en) |
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|---|---|---|---|---|
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| CN105400927A (en) * | 2015-12-24 | 2016-03-16 | 马鞍山中科冶金材料科技有限公司 | Multi-element nitralloy core-spun yarn and application and application method of same to HRB400 steel reinforcing treatment technology |
| CN105463287A (en) * | 2015-12-24 | 2016-04-06 | 马鞍山中科冶金材料科技有限公司 | Multi-element nitralloy material and preparation method and application thereof |
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2016
- 2016-11-18 CN CN201611015749.9A patent/CN106399627A/en not_active Withdrawn
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|---|---|---|---|---|
| CN101260450A (en) * | 2008-04-30 | 2008-09-10 | 湖北猴王焊材有限公司 | Micro-alloy composite core-spun yarn for high-strength structure steel |
| CN101875994A (en) * | 2010-03-31 | 2010-11-03 | 湖北猴王焊材有限公司 | Novel weathering resistant steel microalloying compound core-spun yarn |
| CN202401117U (en) * | 2011-12-08 | 2012-08-29 | 攀枝花钢城集团有限公司 | Cored wire |
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Application publication date: 20170215 |