CN106086310A - A kind of seamless pure calcium line and preparation method thereof - Google Patents
A kind of seamless pure calcium line and preparation method thereof Download PDFInfo
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- CN106086310A CN106086310A CN201610721530.4A CN201610721530A CN106086310A CN 106086310 A CN106086310 A CN 106086310A CN 201610721530 A CN201610721530 A CN 201610721530A CN 106086310 A CN106086310 A CN 106086310A
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- 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
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- 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
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- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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Abstract
The present invention relates to a kind of seamless pure calcium line and preparation method thereof, described seamless pure calcium line includes outer layer and internal layer, described outer layer is for overlap joint and is welded to connect, described lap-joint is fold inward shape, described lap-joint is for be made up of four layers of described outer layer, wherein, ecto-entad is once respectively ground floor, the second layer, third layer and the 4th layer, and described ground floor and the second layer are welded to connect.The present invention is in addition to having existing seamless pure calcium line advantage, and production cost should decrease, additionally, feeding wire machine can use existing monolayer pure calcium line feeding wire machine, promote relatively easy, to solving splash, the nitrogen pick-up that the double-deck pure calcium line of current domestic monolayer exists, reduce smelting cost significant.
Description
Technical field
The invention belongs to technical field of smelting, relate to a kind of seamless pure calcium line and preparation method thereof.
Background technology
Nonmetallic inclusionsin steel is one of principal element affecting steel performance, improves Molten Steel Cleanliness, reduces in steel
Oxygen content and oxide are mingled with, always a big difficult point of smelting iron and steel.At present, Molten Steel Cleanliness is required big compared with high steel grade
Aluminum is all used to carry out pre-deoxidation or final deoxidizing, containing a large amount of deoxidation products Al2O3Molten steel continuous casting unstable, be susceptible to water
Mouth dross, affects steel performance.That causes nozzle clogging is mainly composed of Al2O3, it is necessary to remove to greatest extent, to remaining in steel
Al in water2O3It is mingled with and carries out degenerative treatments so that it is form the calcium-aluminate of low melting point, steel performance impact is dropped to by it
Low.
Since last century the nineties, domestic each steel mill steel treatment standard technology is, molten steel is first with silicomanganese, ferrosilicon
Or ferro-aluminum deoxidation, then add aluminum shot at LF stove and carry out top of the slag final deoxidizing, according to steel grade needs, double with molten steel feeding silicon-calcium wire, monolayer
The pure calcium line of layer is referred to as the various calcium heart yearns such as seamed solid pure calcium line, calcium ferroaluminum wire and is carried out Calcium treatment, it is ensured that molten steel is final (Ca)
Reach about 20ppm, so that it is guaranteed that continuous casting is smoothed out.For satisfied steel-making needs, refining operation platform has various calcium simultaneously
Heart yearn, has tied up this most crowded platform space；Change heart yearn kind to extend refining time, increase refining cost, etc., from
And bring problems to steel making operation.
Since 2010, due to domestic calcium metal technical progress of industry, simple metal calcium pump manufacturing cost declines to a great extent, with pure
Metal calcium pump is that the pure calcium line of monolayer of primary raw material is developed rapidly.Monolayer pure calcium line refine Calcium treatment is used to be fed by calcium
To the deeper position of molten steel, thus obtain higher calcium recovery rate, ensure that calcium treatment effect is more stable；The pure calcium line of monolayer does not contains
Silicon, easy to operate can be applicable to low-silicon steel；Than using, silico-calcium, calcium iron wire Calcium treatment cost are lower, but there is Calcium treatment process
Middle molten steel splash is serious, and the more problem of molten steel nitrogen pick-up have impact on the use of the pure calcium line of monolayer.
For overcoming the pure calcium line of monolayer to use splash major defect, being developed double-deck pure calcium line, double-deck pure calcium line utilizes
Calcium metal slow release method, wraps up pure for Ф 6-8mm calcium pump and compressing with two layers of thin steel strip, had both inherited monolayer pure calcium line calcium
Process that easy to operate, calcium recovery rate is stable, the advantage of low cost, be greatly reduced molten steel splash simultaneously, reduce molten steel nitrogen pick-up, base
Originally meeting iron and steel and produce needs, shortcoming is to compare the pure calcium line of monolayer, and double-deck pure calcium line calcium ferrum ratio is low.
But, either monolayer or double-deck pure calcium line, all there is Calcium treatment splash, molten steel nitrogen pick-up problem, and calcium is inhaled
Problem that yield is on the low side.
Due to calcium metal fusing point low (843 ° of C), boiling point low (1450 ° of C), easily float on slag surface in molten steel
React with the oxide in the oxygen in air and slag liquid and scaling loss is fallen.Therefore generally use the core-spun yarn containing calcium metal or calcium alloy such as
CaSi core-spun yarn (Ca28% Si50%) or CaFe core-spun yarn (Ca is about 30%, Fe about 70%) and seamed solid calcium core-spun yarn
(outer layer steel belt occlusion overlap joint), and to be added to molten metal deep when processing as far as possible, utilize the static pressure of molten metal, make calcium metal become
Become before calcium bubble and i.e. react with the oxygen in steel, sulfur etc., it is to avoid one adds and reforms into calcium bubble floating and lose.
Above-mentioned seamed core-spun yarn has been able to meet the technology requirement of a part of steel grade refine, but the most very
Preferable.This is because there will be molten steel during Ca Si wire feeding to increase silicon phenomenon, the lastness of the increase steel to be had influence on of silicone content
Energy；Do not have aforesaid increasing silicon phenomenon when using Ca-Fe core-spun yarn, but be packaged in the Fe-Ca powder composition within core-spun yarn
After core-spun yarn enters molten steel, the most softened under the effect of high temperature, even if higher feeding wire speed, core-spun yarn also cannot penetrate height
Temperature molten steel enters deep, is mostly positioned at the top of molten steel, and calcium metal, by Quick-gasifying, forms calcium bubble, at it not yet with in steel
The surface of molten steel has been floated to so that the recovery rate of calcium metal is relatively low only has about 10%, greatly when impurity haptoreaction
The calcium metal of amount the most unnecessarily wastes；Using seamed solid calcium core-spun yarn molten steel to have boiling phenomenon, the recovery rate of calcium metal is relatively
Low only have about 20%, and add the N content in molten steel.This is because the most seamed core-spun yarn processing technology is physical connection
And have gap, its gap is about 0.05-0.1, molten steel from gap enter, which increase calcium fusing and gasification speed
Degree；2. at a temperature of refined molten steel, seamed core-spun yarn steel band softens rapidly, and overlapping part steel band intensity reduces can not fetter metal
Calcium steam, the latter quickly goes out the excessive mistake of molten steel, and causes splash；The most seamed core-spun yarn, owing to there is gap, causes air to be retained
In gap, enter add molten steel after molten steel gaseous impurity, increase splash simultaneously.
Additionally, abroad also developed seamless pure calcium line technology, seamless pure calcium line is that pure calcium powder first wraps into the thin steel of 1-1.5mm
Band, then thin steel strip is welded as seamless steel pipe.As patent CN201420389712 discloses a kind of pure calcium core-spun yarn of seamless welding.
This technology improves calcium absorptivity, reduces Calcium treatment splash, but due to the most seamless pure calcium line technical matters problem, makes seamless pure
Calcium line price is high and needs unique wire-feeding device comprising straightening wire-leading device, causes use cost high, and this product be nobody shows any interest in China's steel industry.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention provides a kind of seamless pure calcium line and preparation method thereof, and it is pure that this is seamless
There is not gap in calcium line, will not be deposited in gap by air, avoids expulsion events, low cost of manufacture after entering molten steel.
The invention provides following technical scheme:
A kind of seamless pure calcium line, including outer layer and internal layer, described outer layer is for overlap joint and is welded to connect, and described lap-joint is in infolding
Stacked, described lap-joint is made up of four layers of described outer layer, and wherein, ecto-entad respectively is ground floor, the second layer, third layer
With the 4th layer, described ground floor and the second layer are welded to connect.
Wherein, described inwardly will described lap-joint roll up in the inside.
Pure for monolayer calcium line calcium core is completely encapsulated in the space that outer layer is formed by the present invention, described ground floor and second layer weldering
Connecing in succession, fuse into one, this is seamless there is not gap in pure calcium line, will not be deposited in gap by air, keeps away after entering molten steel
Exempt from expulsion events, reduce molten steel N increment.
In such scheme preferably, the junction of described outer layer, the two ends for the opening of described outer layer mutually overlap,
Mutually after overlap joint, the two ends of the opening of described outer layer overlap a part and contacting with each other, and the part then overlapped is rolled over again
Fold once.
Briefly, the junction of described outer layer, i.e. one overlapping edges on another edge, the most described lap-joint to
It is overlapped on following side to fold, in occlusion state.
In any of the above-described scheme preferably, the coupling part of described overlap joint is blocked in inside.
In any of the above-described scheme preferably, the junction of described outer layer is for being tightly connected.
In any of the above-described scheme preferably, the laser welding that is welded as of described ground floor and the second layer connects.
In any of the above-described scheme preferably, the weld penetration of described steel band is 0.8-1.7mm.
In any of the above-described scheme preferably, the weld seam of described welding is for running through described ground floor and the second layer, or institute
State weld seam for running through described ground floor and portion of second layer.
In any of the above-described scheme preferably, the junction of the described second layer and third layer connects for overlap joint or welding connects
Connect.
In any of the above-described scheme preferably, the junction of described third layer and the 4th layer connects for overlap joint.
In any of the above-described scheme preferably, described outer layer material is steel.
In any of the above-described scheme preferably, described outer layer is steel band.
In any of the above-described scheme preferably, the thickness of described steel band is 0.5-0.8mm.
In any of the above-described scheme preferably, the thickness of described steel band is 0.55-0.62mm.
Existing seamless pure calcium line thickness of strips is typically at 1.2-1.5mm, and in the present invention, thickness of strips is that 0.5-0.8mm is
Can meet production requirement, additionally steel band is the thinnest, and in the seamless pure calcium line of Unit Weight, the ratio of calcium is the highest, and use cost is low.
In any of the above-described scheme preferably, the overall diameter of described seamless pure calcium line is 9.5-11.5mm.
Ladle size and a diameter of positive correlation of calcium pump, ladle is the biggest, and calcium pump diameter used by seamless pure calcium line is the biggest, seamless pure
Calcium line external diameter is the biggest.The present invention matches for the more preferable size with ladle, and the overall diameter of described seamless pure calcium line is set as
9.5-11.5mm, make production technology and product more preferable.
In any of the above-described scheme preferably, described internal layer is steel band.
In any of the above-described scheme preferably, parcel calcium metal in described internal layer.
In any of the above-described scheme preferably, parcel calcium pump or other calcium metal in described internal layer.
In any of the above-described scheme preferably, a diameter of 6.5-8.5 of described calcium pump.
In any of the above-described scheme preferably, a diameter of 6.8-8 of described calcium pump.
In any of the above-described scheme preferably, in described calcium pump, calcium content is more than or equal to 96%.
In any of the above-described scheme preferably, calcium ferrum ratio (20-40) in described seamless pure calcium line: (60-80).
In any of the above-described scheme preferably, calcium ferrum ratio (28-31) in described seamless pure calcium line: (72-69).
The present invention optimizes calcium ferrum ratio in seamless pure calcium line, i.e. meets production requirement, both made calcium content meet requirement, again
Reduce use cost.
The present invention also provides for the preparation method of described seamless pure calcium line, and described lap-joint uses laser welding to connect, weldering
Meet speed 3-15m/min, steel band weld penetration 0.8-1.7mm.
Laser-welded product smooth in appearance, can be used directly；And can transform on the basis of present pure calcium line production line and form；
Outer layer steel belt can be thinner, and other welding procedure is not accomplished.The setting of laser weld parameters in the present invention, it is possible to effectively ensure
Welding effect, improves subsequent production efficiency.In the range of the steel band weld penetration that the laser welding of the present invention is reached, it is possible to really
Protect steel band and be welded into confined space, stop calcium steam excessive.Speed of welding is low, higher than 15 m/min less than 3m/min production efficiency
Welder power is too big, and cost is high.
In any of the above-described scheme preferably, described steel band weld penetration is 0.8-1.2mm.
In any of the above-described scheme preferably, described laser welding is that laser welds continuously, and laser output power is
2-5KW, negative out of focus is 0.4-1.0mm.
Wherein laser power refers to output.
In any of the above-described scheme preferably, laser output power is 2kw.
In any of the above-described scheme preferably, described negative out of focus is 0.6mm.
In the present invention, laser welding can be by welding together the outside two-layer of pure for monolayer calcium line snapping steel band, it is achieved single
The outer layer steel belt total enclosing of the pure calcium line of layer, is completely encapsulated in calcium core in steel band confined space, thus improves steel band high temperature
Lower constraint calcium steam ability, is transported to the 1.6m molten steel degree of depth by calcium core.Use seamless steel pipe that calcium metal is quickly sent to 1.6m steel
Water depth, can make calcium metal steam the most excessive with molten steel balance.Seamless steel pipe is only used calcium metal maximum to be sent to
So degree of depth, reaches to improve calcium recovery rate, the purpose of minimizing splash.After the present invention is seamless pure calcium line enters molten steel, Ca receives
Rate is up to 25-45%.Existing seamed pure calcium line calcium recovery rate is generally about 20%；Existing seamless pure calcium line calcium recovery rate is
About 35%；The calcium recovery rates such as silicon-calcium wire are relatively low, are about 15%；The effect of the seamless pure calcium line of the present invention, hence it is evident that be better than existing
Product.
The present invention is in addition to having existing seamless pure calcium line advantage, and production cost should decrease, it addition, feeding wire machine can
Use existing monolayer pure calcium line feeding wire machine, promote relatively easy, to solving splash, the increasing that the double-deck pure calcium line of current domestic monolayer exists
Nitrogen, reduces smelting cost significant.
Accompanying drawing explanation
Fig. 1 is the schematic cross-section of a preferred embodiment ectomesoderm of a kind of seamless pure calcium line of the present invention；
Fig. 2 be Fig. 1 outer layer cross section in the schematic diagram of weld penetration.
Detailed description of the invention
In order to further appreciate that the technical characteristic of the present invention, below in conjunction with specific embodiment, the present invention is explained in detail
State.Embodiment only has exemplary effect to the present invention, and does not have any restrictive effect, those skilled in the art
The amendment of any unsubstantiality made on the basis of the present invention, all should belong to protection scope of the present invention.
In describing the invention, it is to be understood that in term " on ", D score, " top ", " end ", " interior ", " outward ", etc.
Orientation or the position relationship of instruction are based on orientation shown in the drawings or position relationship, are for only for ease of the description present invention and Jian
Change and describe rather than instruction or the hint device of indication or element must have specific orientation, with specific azimuth configuration or
Operation, is therefore not considered as limiting the invention.
Embodiment 1:
As shown in Figure 1-2, a kind of seamless pure calcium line, including outer layer and internal layer, described outer layer 1 is for overlap joint and is welded to connect, described
Lap-joint is fold inward shape, and described lap-joint is made up of four layers of described outer layer, and wherein, ecto-entad respectively is ground floor
2, the second layer 3, third layer 4 and the 4th layer 5, described ground floor 2 and the second layer 3 are welded to connect.
In the present embodiment, the junction of described outer layer, the two ends for the opening of described outer layer mutually overlap, and mutually overlap
The two ends of the opening of rear described outer layer overlap a part and contacting with each other, and the part then overlapped is folded again at.
In the present embodiment, the coupling part of described overlap joint is blocked in inside.
In the present embodiment, the junction of described outer layer is for being tightly connected.
In the present embodiment, the laser welding that is welded as of described ground floor 2 and the second layer 3 connects.
In the present embodiment, the weld penetration 0.8-1.7mm of described steel band.(as in figure 2 it is shown, wherein R to be weld seam deep
Degree)
In the present embodiment, the weld seam of described welding is for running through described ground floor 2 and the second layer 3, or described weld seam is for running through
State ground floor 2 and portion of second layer 3.
In the present embodiment, the junction of the described second layer 3 and third layer 4 connects for overlap joint or is welded to connect.
In the present embodiment, the junction of described third layer 4 and the 4th layer 5 connects for overlap joint.
In the present embodiment, described outer layer material is steel.
In the present embodiment, described outer layer is steel band.
In the present embodiment, the thickness of described steel band is 0.5-0.8mm.The thickness being preferably described steel band is 0.55-
0.62mm。
In the present embodiment, the weld penetration 0.8-1.7mm of described steel band.
In the present embodiment, the overall diameter of described seamless pure calcium line is 9.5-11.5mm.
In the present embodiment, described outer layer is steel band.
In the present embodiment, parcel calcium metal in described internal layer.
In the present embodiment, coated metal calcium pump or other calcium metal in described internal layer.
In the present embodiment, a diameter of 6.5-8.5mm of described calcium pump, preferably 6.8-8.
In the present embodiment, in described calcium pump, calcium content is more than or equal to 96%.
In the present embodiment, calcium ferrum ratio (20-40) in described seamless pure calcium line: (60-80), it is preferably (28-31): (72-
69).
Embodiment 2:
The preparation method of the seamless pure calcium line described in embodiment 1, described lap-joint uses laser welding to connect, speed of welding 3-
15m/min, steel band weld penetration 0.8-1.7mm.
Embodiment 3:
The preparation method of seamless pure calcium line described in embodiment 1, wherein said steel band weld penetration 0.8-1.2mm.
Embodiment 4:
The preparation method of the seamless pure calcium line described in embodiment 2, wherein said laser welding is that laser welds continuously, and laser instrument is defeated
Going out power is 2KW, and negative out of focus is 0.6mm.
Embodiment 5:
In the present embodiment, the seamless pure calcium line to embodiment 1 uses different preparation method contrast, listed by (1) specific as follows-(4)
Preparation parameter:
(1) the continuous laser welding using output to be 2kw, speed of welding 15-25m/min, steel band weld penetration 0.3-
0.5mm;
(2) the continuous laser welding using output to be 2kw, speed of welding 2-3m/min, steel band weld penetration 1.4-
1.7mm;
(3) the continuous laser welding using output to be 2kw, speed of welding 7-12m/min, steel band weld penetration 0.5-
0.8mm；
(4) the continuous laser welding using output to be 2kw, speed of welding 5-6m/min, steel band weld penetration 0.8-
1.4mm;
Above sample detection proves, monolayer pure calcium line two-layer lap-joint speed of welding is 5-6m/min, and steel band weld penetration is
0.8-1.4mm, this type high power laser bonding machine most meets pilot production level.
(1) other experiment conditions of-(4) are identical, only consider that speed of welding and steel band weld penetration are to pilot production level
Meet situation.
Embodiment 6:
In the present embodiment, the seamless pure calcium line to embodiment 1 uses different preparation method to prepare, after the sample application obtained
Calcium recovery rate is analyzed, the preparation parameter listed by (1) specific as follows-(2):
(1), use laser welding, speed of welding 5-6m/min, steel band weld penetration 0.8mm, enter in steel mill's steel grade is smelted
Row refine Calcium treatment, calcium recovery rate is 35%.
(2), use laser welding, speed of welding 4-5m/min, steel band weld penetration 1.2mm, smelt at steel mill's steel grade
In carry out refine Calcium treatment, calcium recovery rate is 42%.
(1) identical with other experiment conditions of (2), only consider speed of welding and the steel band weld penetration shadow to calcium recovery rate
Ring.
Embodiment 7:
As it is shown in figure 1, a kind of seamless pure calcium line, including outer layer and internal layer, described outer layer 1 is for overlap joint and is welded to connect, described in take
Meeting place is fold inward shape, and described lap-joint is made up of four layers of described outer layer, wherein, ecto-entad respectively be ground floor 2,
The second layer 3, third layer 4 and the 4th layer 5, described ground floor 2 and the second layer 3 are welded to connect.
Embodiment 8:
The present embodiment is on the basis of embodiment 7, and the junction of described outer layer, for the two ends phase lap of the opening of described outer layer 1
Connecing, mutually after overlap joint, the two ends of the opening of described outer layer 1 overlap a part and contacting with each other, the part then overlapped
It is folded again at.
Embodiment 9:
The present embodiment is on the basis of embodiment 8, and the coupling part of described overlap joint is blocked in inside.
Embodiment 10:
The present embodiment is on the basis of embodiment 9, and the junction of described outer layer 1 is for being tightly connected.
Embodiment 11:
The present embodiment is on the basis of embodiment 10, and the laser welding that is welded as of described ground floor 2 and the second layer 3 connects.
Embodiment 12:
The present embodiment on the basis of embodiment 11, the weld penetration 0.8-1.7mm of described steel band.(as in figure 2 it is shown, wherein R is
For weld penetration)
Embodiment 13:
The present embodiment is on the basis of embodiment 7, and the weld seam of described welding is for running through described ground floor 2 and the second layer 3.
Embodiment 14:
The present embodiment is on the basis of embodiment 7, and described weld seam is for running through described ground floor 2 and portion of second layer 3.
Embodiment 15:
The present embodiment is on the basis of embodiment 7, and the junction of the described second layer 3 and third layer 4 connects for overlap joint.
Embodiment 16:
The present embodiment is on the basis of embodiment 7, and the junction of the described second layer 3 and third layer 4 is for being welded to connect.
Embodiment 17:
The present embodiment is on the basis of embodiment 7, and the junction of described third layer 4 and the 4th layer 5 connects for overlap joint.
Embodiment 18:
The present embodiment is on the basis of embodiment 7, and described outer layer material is steel.
Embodiment 19:
The present embodiment is on the basis of embodiment 18, and described outer layer is steel band.
Embodiment 20:
The present embodiment is on the basis of embodiment 19, and the thickness of described steel band is 0.55-0.62mm.The weld penetration of described steel band
0.8-1.7mm.The overall diameter of described seamless pure calcium line is 9.5-11.5mm.
Embodiment 21:
The present embodiment is on the basis of embodiment 20, and described outer layer is steel band.Parcel calcium metal in described internal layer.In described internal layer
Coated metal calcium pump or other calcium metal.The a diameter of 6.8-8 of described calcium pump.In described calcium pump, calcium content is more than or equal to 96%.
Embodiment 22:
The present embodiment is on the basis of embodiment 21, and in described seamless pure calcium line, calcium ferrum is than being (28-31): (72-69).
Embodiment 23:
The preparation method of the seamless pure calcium line described in embodiment 7, described lap-joint uses laser welding to connect, speed of welding 3-
15m/min, steel band weld penetration 0.8-1.7mm.
Embodiment 24:
The preparation method of seamless pure calcium line described in embodiment 7, wherein said steel band weld penetration 0.8-1.2mm.
Embodiment 25:
The preparation method of the seamless pure calcium line described in embodiment 7, wherein said laser welding is that laser welds continuously, and laser instrument is defeated
Going out power is 2KW, and negative out of focus is 0.6mm.
Claims (10)
1. a seamless pure calcium line, including outer layer and internal layer, it is characterised in that: described outer layer is for overlap joint and is welded to connect, described
Lap-joint is fold inward shape, and described lap-joint is made up of four layers of described outer layer, and wherein, ecto-entad respectively is first
Layer, the second layer, third layer and the 4th layer, described ground floor and the second layer are welded to connect.
Seamless pure calcium line the most according to claim 1, it is characterised in that: the junction of described outer layer, for described outer layer
The two ends of opening mutually overlap, and mutually after overlap joint, the two ends of the opening of described outer layer overlap a part and contacting with each other, so
After the part that overlaps be folded again at.
Seamless pure calcium line the most according to claim 1, it is characterised in that: described ground floor and the second layer be welded as laser
It is welded to connect.
Seamless pure calcium line the most according to claim 1, it is characterised in that: the weld seam of described welding is for running through described ground floor
And the second layer, or described weld seam is for running through described ground floor and portion of second layer.
Seamless pure calcium line the most according to any one of claim 1 to 4, it is characterised in that: described outer layer is steel band, described
The thickness of steel band is 0.5-0.8mm.
Seamless pure calcium line the most according to any one of claim 1 to 4, it is characterised in that: outside described seamless pure calcium line
A diameter of 9.5-11.5mm.
Seamless pure calcium line the most according to any one of claim 1 to 4, it is characterised in that: parcel calcium gold in described internal layer
Belong to.
Seamless pure calcium line the most according to any one of claim 1 to 4, it is characterised in that: calcium in described seamless pure calcium line
Ferrum ratio (20-40): (60-80).
9., according to the preparation method of pure calcium line seamless according to any one of claim 1 to 8, described lap-joint uses laser welding
Connecting, speed of welding 3-15m/min, steel band weld penetration is 0.8-1.7mm.
The preparation method of seamless pure calcium line the most according to claim 9, it is characterised in that: described laser welding is laser
Welding continuously, laser output power is 2-5KW, and negative out of focus is 0.4-1.0mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111254255A (en) * | 2020-03-24 | 2020-06-09 | 辽宁东戴河新区佳联科技有限公司 | Inner-buckled solid pure calcium cored wire |
| CN114082908A (en) * | 2021-11-20 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for reducing temperature of molten steel in casting furnace |
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| CN114082908A (en) * | 2021-11-20 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for reducing temperature of molten steel in casting furnace |
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Application publication date: 20161109 |