CN111139336A - Deoxidized alloy cored wire for improving welding performance of steel and manufacturing method thereof - Google Patents
Deoxidized alloy cored wire for improving welding performance of steel and manufacturing method thereof Download PDFInfo
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- CN111139336A CN111139336A CN202010064307.3A CN202010064307A CN111139336A CN 111139336 A CN111139336 A CN 111139336A CN 202010064307 A CN202010064307 A CN 202010064307A CN 111139336 A CN111139336 A CN 111139336A
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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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- 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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Abstract
The invention discloses a deoxidized alloy core-spun yarn for improving the welding performance of steel, which comprises an outer protective layer and an inner alloy core layer, wherein the protective layer comprises two iron sheet layers and a CaO heat insulation layer clamped in the iron sheet layers; the core layer comprises an Ni-Mg alloy powder layer arranged inside and a Ti-Fe powder layer outside; wherein the mass ratio of each component in the core layer is Ni: ti: mg = 10: (3-20): (1-3). The invention also discloses a manufacturing method thereof, which comprises the steps of spreading CaO powder between two iron sheet layers, compacting, and then uniformly spreading FeTi70 alloy powder and NiMg20 alloy powder on the two iron sheet layers in sequence; rolling into core-spun yarn, compacting by drawing, and winding into coil. The cored wire can be deeply inserted into molten steel, so that the generated oxides, regardless of the components and the granularity, can reach the expected stable target. The core-spun yarn has the advantages that the tail end decomposition speed is delayed, the proportion can be controlled, and the metallurgical requirements of oxides can be met more accurately.
Description
Technical Field
The invention belongs to the technical field of steel metallurgy for high heat input welding, and particularly relates to a deoxidized alloy cored wire for improving the welding performance of steel and a manufacturing method thereof.
Background
Conventional welding is a main processing mode of a combined structure of steel materials, but the manual labor amount is large, the production efficiency is low, and the operation specification is strict. The high heat input welding has the advantages of being suitable for automation, improving manufacturing efficiency, reducing the amount of labor of manpower and the like, but the weld joint fusion line and the toughness of a heat affected zone of a steel plate material under the high heat input welding condition meet the design quality requirement, the steel plate produced by the traditional process can not reach the level, people mostly want to obtain the steel plate in an oxide metallurgy mode at present, even if the steel has a certain amount of high-melting-point oxide particles which are distributed in a fine and dispersed mode, the hot zone structure is restrained from growing excessively in the welding process on the premise of not reducing the toughness of the steel plate, and meanwhile, the steel plate is taken as a phase transformation induced nucleation point to induce the structure thinning after temperature reduction and phase transformation. The control of Ti oxides obtained by Ti treatment at specific oxygen sites and the inhibition of Ti oxides from aggregation and floating in the liquid state by Mg treatment are the efforts of material designers. In practice, different deoxidation alloys are fed to the steel step by step through the core-spun wire. In order to form desired oxide particles of Ti, Mg, etc., composite cored wires of Ti-Mg-Re, Ti-Mg-Ca, etc. are also used.
In the prior art, the following problems exist: firstly, the alloy in the wire reacts violently with the shallow molten steel, and the components in the steel are difficult to stably reach the expected target value, so that the steel has no quality reliability; secondly, the alloy wire is too active to reach the optimal depth for uniformly distributing the components, and the premature reaction also causes the component proportion in the steel to be difficult to control; thirdly, the prior deoxidized alloy component has no obvious effect on improving the welding performance.
Disclosure of Invention
The invention aims to provide a deoxidized alloy cored wire for improving the welding performance of steel and a manufacturing method thereof, which aim to solve the problems in the prior art.
The invention is realized by the following technical scheme: the utility model provides a improve deoxidation alloy cored wire of welding performance of steel which characterized in that: the alloy core layer is arranged inside the protective layer, and the protective layer comprises two iron sheet layers and a CaO heat insulation layer clamped in the iron sheet layers; the core layer comprises an Ni-Mg alloy powder layer arranged inside and a Ti-Fe powder layer outside; wherein the mass ratio of each component in the core layer is Ni: ti: mg = 10: (3-20): (1-3).
Further: wherein the mass ratio of each component of the core layer is Ni: ti: mg = 10: (7-8): (2-3).
The invention also discloses a manufacturing method of the cored wire, which comprises the following steps: the method comprises the following steps:
s1, selecting an iron plate with the thickness of 0.8-0.9 mm as an outer iron sheet layer, uniformly spreading CaO powder on the iron plate, coating an iron plate with the thickness of 0.5-0.6 mm on the CaO powder as an inner iron sheet layer, compacting the three layers by a press roller, and controlling the thickness of the CaO powder layer to be 0.2-0.3 mm;
s2, taking the composite material protective layer as a wrapping, and uniformly spreading FeTi70 alloy powder and NiMg20 alloy powder in sequence;
s3, rolling the core-spun yarn into a core-spun yarn, and rolling the core-spun yarn into a coil by drawing and compacting, wherein the diameter of the core-spun yarn is controlled to be 11-12 mm;
and S4, sealing by adopting a moisture-proof package.
Further: the powder falling in the winding process is separated and recycled by a magnetic separation method.
The invention has the advantages that: according to the invention, calcium oxide powder is added into the metal wrapping tape to serve as a heat insulation layer, so that the conduction of the temperature of the molten steel to the core of the cored wire is effectively delayed, before the surface metal layer is melted, the front end of the wire is driven to be more than 2m below the liquid level of the molten steel, and at the moment, the wire core metal starts to react with the molten steel, so that the generated oxides can reach the expected stable target no matter the components or the granularity. The decomposition speed of the tail end of the cored wire provided by the invention is delayed, so that the components of oxide forming elements in the cored wire can basically and completely enter molten steel, the proportion can be controlled, and the metallurgical requirements of oxides can be met more accurately.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an electron microscope spectrum of the main inclusions in steel grade 1 and a table of the distribution of the inclusions;
FIG. 3 is an electron micrograph of the major inclusions in steel type 2 and a table showing the distribution of the inclusions;
FIG. 4 is a histogram of the oxide distribution particle density ratio in steel grades 1 and 2.
The sequence numbers in the figures illustrate: 1 is a protective layer, 2 is an alloy core layer, 11 is an iron sheet layer, 12 is a CaO heat-insulating layer, 21 is a Ni-Mg alloy powder layer, and 22 is a Ti-Fe powder layer.
Detailed Description
The invention discloses a deoxidized alloy core-spun yarn for improving the welding performance of steel, which comprises a protective layer 1 and an alloy core layer 2 which are arranged outside, wherein the protective layer 1 comprises two iron sheet layers 11 and a CaO heat insulation layer 12 clamped in the iron sheet layers; the core layer 2 comprises an Ni-Mg alloy powder layer 21 arranged inside and a Ti-Fe powder layer 22 outside; wherein the mass ratio of each component of the core layer is Ni: ti: mg = 10: (3-20): (1-3); the preferred mass ratio is Ni: ti: mg = 10: (7-8): (2-3).
The invention also discloses a manufacturing method of the cored wire, which comprises the following steps:
s1, selecting an iron sheet with the thickness of 0.8-0.9 mm as an outer layer, uniformly spreading passivated CaO powder on the outer layer, spreading an iron sheet with the thickness of 0.5-0.6 mm on the CaO powder, controlling the clamping force to be more than or equal to 200N, and controlling the thickness of the CaO powder layer to be 0.2-0.3 mm;
s2, taking the composite material protective layer as a wrapping, and uniformly spreading FeTi70 alloy powder and NiMg20 alloy powder in sequence;
s3, rolling the core-spun yarn into a core-spun yarn, and rolling the core-spun yarn into a coil by drawing and compacting, wherein the diameter of the core-spun yarn is controlled to be 11-12 mm;
and S4, the outer package of the coil is sealed by double-layer plastic cloth moisture-proof package.
Preferably: the powder falling off in the winding process is separated and recycled by a magnetic separation method.
The cored wire can be stably fed to a depth below an expected depth in molten steel, an expected oxide component proportion is obtained, and stable and reliable production of steel for large-wire-energy welding is guaranteed.
According to the analysis of oxide inclusions by metallurgical thermodynamics and aging theory, the oxide of magnesium has a higher nucleation rate than that of titanium oxide, and does not substantially grow rapidly with time as the oxide formation time is prolonged. The composite deoxidation mode of adding magnesium after the deoxidation of the low-oxygen potential molten steel by titanium is favorable for obtaining a large amount of fine deoxidation inclusions, and on one hand, the oxide of titanium has smaller interface energy with the molten steel and higher homogeneous nucleation rate, so that the size distribution range of the initial deoxidation inclusions is narrower, and the curing growth is inhibited. On the other hand, magnesium is used as a strong deoxidizer, so that the dissolved oxygen in steel is extremely low, the growth rate of deoxidation inclusions is reduced, and more fine deoxidation Mg-Ti-O inclusions can be obtained.
Although the oxide of magnesium is fine, due to the characteristics of magnesium: low melting point of 650 deg.C, low boiling point of 1080 deg.C, high vapor pressure of 1600 deg.C above 2MPa, and low density of 1.74g/cm3Therefore, magnesium is difficult to be added into molten steel, and the magnesium is required to be added into the molten steel by an external force wire feeding machine in order to be smoothly dissolved in the steel. Even so, because the temperature of the molten steel is as high as more than 1540 ℃, the magnesium oxide in the wire fed into the steel is quickly vaporized due to good heat conductivity, the generated pressure leads the cored wire to be broken early, the wire end is difficult to enter the deep layer of the molten steel, and the deoxidation reaction is carried out on the surface of the molten steel, so that the beneficial oxide in the molten steel cannot be effectively formed.
According to the invention, calcium oxide powder is added into the metal wrapping tape to serve as a heat insulation layer, so that the conduction of the temperature of the molten steel to the core of the cored wire is effectively delayed, before the surface metal layer is melted, the front end of the wire is driven to be more than 2m below the liquid level of the molten steel, and at the moment, the wire core metal starts to react with the molten steel, so that the generated oxides can reach the expected stable target no matter the components or the granularity. The decomposition speed of the tail end of the cored wire provided by the invention is delayed, so that the components of oxide forming elements in the cored wire can basically and completely enter molten steel, the proportion can be controlled, and the metallurgical requirements of oxides can be met more accurately.
The invention selects the passivated CaO powder as the heat insulating layer, has better heat insulating property, is easy to float upwards in molten steel, is not easy to become new inclusion in the steel, and is not easy to react with Mg and Ti to reduce expected fine oxides; in addition, the passivated CaO powder is arranged in the interlayer, so that the final heat insulation layer can uniformly wrap the core metal;
the thickness of the outer layer iron sheet is 0.8-0.9 mm, so that the phenomenon that the heat insulation layer is damaged due to too thin and early melting of surface metal, and the front end of the steel cannot reach the expected depth when the steel is fed into a wire is avoided; the phenomenon that the proportion of occupied lines of the iron sheet is too high when the iron sheet is too thick is avoided, so that the efficiency and the cost are poor when the steel mill produces the steel sheet;
the alloy proportion of the cored wire can ensure that TiO and MgO particles with proper proportion are obtained in steel, and the cored wire reaches the optimal scale, thereby being fully beneficial to the weldability of a finished steel plate;
according to the invention, NiMg20 is selected as alloy powder, and because Mg and Ni already form an alloy, the vaporization point of the alloy powder is greatly improved, the reaction degree of Mg in steel is slowed down, and the alloy powder is beneficial to operation safety; selecting FeTi70 as another alloy powder, wherein the content of Ti is high, the content of effective component Ti in the wire is high, and the smelting efficiency is high under the same wire weight under the condition that the metal powder core accounts for a smaller proportion; while also taking into account cost considerations.
In the method, the FeTi70 alloy powder and the NiMg20 alloy powder are sequentially distributed during coiling, so that NiMg20 which is easy to generate vaporization reaction can be further wrapped at the center of the wire, and the phenomenon that Mg is vaporized too early and reacts with oxygen in steel on the surface of molten steel to influence the metallurgical effect is prevented.
The effect of the invention is further illustrated by the following specific comparative examples:
firstly, selecting the cored wire of the invention, wherein the mass ratio of each component is as follows: ti: ni: mg: CaO = 35.3: 47: 11.7: 3.1, the diameter of the cored wire is phi 12mm, the powder weight per unit length is more than or equal to 342g, and the iron sheet weight is less than or equal to 358 g.
Two steel grades are selected, wherein the steel grade 1 is used as a blank sample, the conventional Ni-Mg core-spun yarn is processed and used according to the prior art, the core-spun yarn disclosed by the invention is added into the steel grade 2, and the steps of proportioning, refining, deoxidizing and the like are respectively carried out. The method comprises the following specific steps:
steel grade 1: chemical components (wt%): c: 0.047%, Si: 0.22%, Mn: 1.53%, P: 0.007%, S: 0.001%, Alt: 0.032%, Nb: 0.042%, Ti: 0.014%, Cr: 0.22%, Mo: 0.16%, Ni: 0.23%, Cu: 0.23%, Pcm: 0.21%, CEV: 0.42 percent. The steel-making production process comprises the following steps: converter double-slag smelting, LF refining, RH vacuum treatment and continuous casting. Steel grade 1 was deoxidized with conventional SiMn alloy and Al. An electron micrograph of the cost steel is shown in fig. 2, and the mass ratio of each component in the inclusions is: c, O, Mg, Al, Si, S, Ca, Fe =5.4, 38.68, 1.67, 20.89, 0.87, 1.06, 25.37, 6.06.
Steel grade 2: chemical composition (wt%), C: 0.043%, Si: 0.18%, Mn: 1.56%, P: 0.008%, S: 0.001%, Alt: 0.011%, Nb: 0.039%, Ti: 0.014%, Cr: 0.21%, Mo: 0.17%, Ni: 0.22%, Cu: 0.21%, Pcm: 0.21%, CEV: 0.42 percent. The steel-making production process comprises the following steps: converter double-slag smelting, LF refining, feeding the deoxidizing alloy wire, RH vacuum treatment and continuous casting. And feeding the steel grade 2 into molten steel at a wire feeding speed of 1.2-2.0 m/s under the low-oxygen potential molten steel condition after SiMn composite deoxidation, and carrying out continuous casting protection pouring on the wire feeding molten steel after RH treatment. An electron micrograph of the cost steel is shown in fig. 3, and the mass ratio of each component in the inclusions is: mg, Al, Ca, Ti, Mn, Fe =2.87:38.12:6.57:16.08:3:7.17:8.29:3.36: 14.55.
In the two steel grades, the contents of partial components have slight difference for the process requirement, but the credibility of the performance comparison is not influenced. The detection shows that the composition of the inclusions in the steel grade 2 is as follows: central part Al2O3MgO, whose outer layer is coated with MnS-CaS and TiOXThe formation of such oxide inclusions is beneficial for improving the impact toughness of the welded joint of steel.
Meanwhile, the number of oxide inclusions with different sizes in unit volume of the two steel grades is counted, and the ratio of the number of the oxide inclusions with different sizes in unit volume of the steel grade 2 to the number of the oxide inclusions with different sizes in unit volume of the steel grade 1 is shown as an attached diagram 4. Counting the number of oxide inclusions with the grain size range of 200 nm-10 mu m, wherein the distribution density of inclusions with the grain size of 2 mu m or less of the steel grade is more than 3 times of that of inclusions with the grain size of 3 mu m or more of the steel grade 1, and the distribution density of the inclusions with the grain size of 3 mu m or more is similar.
Through comparison of impact toughness at different temperatures after welding, as shown in the following table, at 0 ℃, the impact toughness of the steel grade 1 and the impact toughness of the steel grade 2 are basically not different, the impact toughness of the steel grade 1 is obviously reduced along with the reduction of the impact temperature, and the reduction amplitude of the steel grade 2 is greatly reduced though the impact toughness is slightly reduced. The welding performance of the steel grade 2 is greatly improved.
Comparison of welding Properties (by electrogas welding, input energy 200KJ/cm)
In addition, the core-spun yarn is compared according to the influence generated when the core-spun yarn is added into molten steel at different yarn feeding speeds. The details are shown in the following table:
table of relationship between absorption rate of Mg and Ti in Steel grade 2 and wire feeding speed
| Sequence number | Speed of feeding wire | Thread feeding amount | Finished product Mg (ppm) | Absorption rate (%) | Finished product Ti (%) |
| 1 | 1.2 | 250 | 8.7 | 10.35 | 0.0164 |
| 2 | 1.5 | 250 | 10.8 | 12.86 | 0.0172 |
| 3 | 1.8 | 250 | 15.2 | 18.14 | 0.0175 |
| 4 | 2.0 | 250 | 12.3 | 14.67 | 0.0172 |
As can be seen from the table above, due to the influence of the buoyancy of the molten steel and the melting speed of the cored wire in the steel, the absorption rate of Mg in the cored wire is greatly different at different wire feeding temperatures, and the optimal wire feeding speed is 1.8-2.0 m/s.
Claims (4)
1. The utility model provides a improve deoxidation alloy cored wire of welding performance of steel which characterized in that:
the alloy core layer is arranged inside the protective layer, and the protective layer comprises two iron sheet layers and a CaO heat insulation layer clamped in the iron sheet layers; the core layer comprises an Ni-Mg alloy powder layer arranged inside and a Ti-Fe powder layer outside;
wherein the mass ratio of each component in the core layer is Ni: ti: mg = 10: (3-20): (1-3).
2. A cored wire of claim 1, wherein: wherein the mass ratio of each component of the core layer is Ni: ti: mg = 10: (7-8): (2-3).
3. A method of manufacturing a cored wire of claim 1, wherein: the method comprises the following steps:
s1, selecting an iron plate with the thickness of 0.8-0.9 mm as an outer iron sheet layer, uniformly spreading CaO powder on the iron plate, coating an iron plate with the thickness of 0.5-0.6 mm on the CaO powder as an inner iron sheet layer, compacting the three layers by a press roller, and controlling the thickness of the CaO powder layer to be 0.2-0.3 mm;
s2, taking the composite material protective layer as a wrapping, and uniformly spreading FeTi70 alloy powder and NiMg20 alloy powder in sequence;
s3, rolling the core-spun yarn into a core-spun yarn, and rolling the core-spun yarn into a coil by drawing and compacting, wherein the diameter of the core-spun yarn is controlled to be 11-12 mm;
and S4, sealing by adopting a moisture-proof package.
4. A method of manufacturing a cored wire according to claim 3, wherein: the powder falling in the winding process is separated and recycled by a magnetic separation method.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112226668A (en) * | 2020-10-13 | 2021-01-15 | 五矿营口中板有限责任公司 | Method for manufacturing low-alloy steel plate containing aluminum and suitable for large-line weldable |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102373371A (en) * | 2010-08-25 | 2012-03-14 | 宝山钢铁股份有限公司 | Method for raising large heat input weldability of thick steel plate |
| CN102851446A (en) * | 2012-09-10 | 2013-01-02 | 上海盛宝冶金科技有限公司 | Multilayer-structured calcium-core wire, and manufacturing method and purpose thereof |
| CN204097507U (en) * | 2014-09-10 | 2015-01-14 | 马鞍山市鑫海耐火材料有限责任公司 | The novel cored-wire of a kind of external refining |
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2020
- 2020-01-20 CN CN202010064307.3A patent/CN111139336A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373371A (en) * | 2010-08-25 | 2012-03-14 | 宝山钢铁股份有限公司 | Method for raising large heat input weldability of thick steel plate |
| CN102851446A (en) * | 2012-09-10 | 2013-01-02 | 上海盛宝冶金科技有限公司 | Multilayer-structured calcium-core wire, and manufacturing method and purpose thereof |
| CN204097507U (en) * | 2014-09-10 | 2015-01-14 | 马鞍山市鑫海耐火材料有限责任公司 | The novel cored-wire of a kind of external refining |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112226668A (en) * | 2020-10-13 | 2021-01-15 | 五矿营口中板有限责任公司 | Method for manufacturing low-alloy steel plate containing aluminum and suitable for large-line weldable |
| CN112226668B (en) * | 2020-10-13 | 2021-06-22 | 五矿营口中板有限责任公司 | Method for manufacturing low-alloy steel plate containing aluminum and suitable for large-line weldable |
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Application publication date: 20200512 |