CN113106349A - Alloy welding wire steel wire rod and preparation method thereof - Google Patents

Alloy welding wire steel wire rod and preparation method thereof Download PDF

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Publication number
CN113106349A
CN113106349A CN202110409846.0A CN202110409846A CN113106349A CN 113106349 A CN113106349 A CN 113106349A CN 202110409846 A CN202110409846 A CN 202110409846A CN 113106349 A CN113106349 A CN 113106349A
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less
equal
percent
molten steel
steel
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CN202110409846.0A
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Chinese (zh)
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徐灯亮
梁鹏
翟进坡
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Tangshan City Delong Iron and Steel Co Ltd
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Tangshan City Delong Iron and Steel Co Ltd
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Priority to CN202110409846.0A priority Critical patent/CN113106349A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/3073—Fe as the principal constituent with Mn as next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron

Abstract

The invention provides an alloy welding wire steel wire rod and a preparation method thereof, and belongs to the technical field of welding steel. The invention provides an alloy welding wire steel wire rod which comprises the following chemical components in percentage by mass: 0.060 to 0.100 percent of C, 0.80 to 0.90 percent of Si, 1.40 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, 0.0020 to 0.0030 percent of B, 0.10 to 0.15 percent of Ti, less than or equal to 0.0025 percent of O, less than or equal to 0.0035 percent of N, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of. According to the invention, by optimally designing the chemical component ranges of the wire rod, the welding seam strength of the finished welding wire made of the wire rod is high, the welding bead forming effect is good, and the low-temperature impact absorption power is high and stable.

Description

Alloy welding wire steel wire rod and preparation method thereof
Technical Field
The invention relates to the technical field of welding steel, in particular to an alloy welding wire steel wire rod and a preparation method thereof.
Background
As an efficient welding material, compared with a welding rod, the solid welding wire has the advantages of low welding cost, low energy consumption, small welding deformation, wide application range, strong anti-rust capability, no need of slag removal after welding and the like, is easy to realize automatic welding, can promote the wide application of a welding robot, and becomes a leading material for the intelligent and efficient development of welding. The alloy welding wire is mainly used for welding large-scale structural parts, has wide application range and large market capacity, and the quality of the base metal wire rod influences the dust generation amount, the welding bead forming and slag removal performance of the welding process of the finished welding wire and the low-temperature impact energy of a welding seam. The alloy welding wire prepared by the existing base metal wire rod has high dust generation amount in the welding process, poor welding bead forming and slag removing performance, low-temperature impact energy of a welding seam, easy damage and serious limitation on popularization and application of the alloy welding wire. Therefore, it is desirable to provide a high performance solder material.
Disclosure of Invention
The invention aims to provide an alloy welding wire steel wire rod and a preparation method thereof, the welding wire prepared from the alloy welding wire steel wire rod provided by the invention has the advantages that the dust content is small in the welding process, the welding bead forming and slag removing performance is good, the formed welding seam has high impact absorption power at the temperature of-30 ℃, the welding wire can be used for welding large structural members, and the welding performance is good.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an alloy welding wire steel wire rod which comprises the following chemical components in percentage by mass: 0.060 to 0.100 percent of C, 0.80 to 0.90 percent of Si, 1.40 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, 0.0020 to 0.0030 percent of B, 0.10 to 0.15 percent of Ti, less than or equal to 0.0025 percent of O, less than or equal to 0.0035 percent of N, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of.
Preferably, the alloy welding wire steel wire rod comprises the following chemical components in percentage by mass: 0.080% of C, 0.85% of Si, 1.45% of Mn, less than or equal to 0.010% of P, less than or equal to 0.008% of S, 0.0020-0.0030% of B, 0.10-0.15% of Ti, less than or equal to 0.0025% of O, less than or equal to 0.0035% of N, less than or equal to 0.10% of Cr, less than or equal to 0.001% of Ni, 0.10% of Cu, less than or equal to 0.10% of Mo, and the.
The invention provides a preparation method of an alloy welding wire steel wire rod in the technical scheme, which comprises the following steps:
(1) sequentially carrying out converter smelting and alloying on the molten iron and the scrap steel to obtain crude molten steel; the molten iron comprises the following chemical components in percentage by mass: less than or equal to 0.040 percent of S, less than or equal to 0.130 percent of P, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of Mo and the balance of Fe; the chemical components of the scrap steel comprise the following components in percentage by mass: less than or equal to 0.040 percent of S, less than or equal to 0.045 percent of P, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of Mo and the balance of Fe; the alloying is to add silicon-manganese alloy and ferrosilicon in turn into the melt obtained by smelting in the converter;
(2) refining the coarse steelmaking liquid obtained in the step (1) to obtain semi-refined molten steel;
(3) sequentially adding ferroboron and ferrotitanium into the semi-refined molten steel obtained in the step (2) to obtain refined molten steel;
(4) casting the refined molten steel obtained in the step (3) to obtain a casting blank;
(5) and (4) rolling the casting blank obtained in the step (4) to obtain the alloy welding wire steel wire rod.
Preferably, the mass ratio of the molten iron to the scrap steel in the step (1) is 1: (0.1-0.2).
Preferably, in the step (1), the raw molten steel comprises the following components in percentage by mass: 0.060-0.070% of C, 0.75-0.80% of Si, 1.35-1.40% of Mn, less than or equal to 0.015% of P, less than or equal to 0.10% of Cr, less than or equal to 0.10% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.10% of Mo, less than or equal to 0.0020% of N, and the balance of iron.
Preferably, the refining in the step (2) is to sequentially add lime and a diffusion deoxidizer into the crude molten steel.
Preferably, the using amount of the lime is 0.5-0.7% of the mass of the rough smelting molten steel; the diffusion deoxidizer is ferrosilicon powder, and the dosage of the ferrosilicon powder is 0.08-0.10% of the mass of the crude molten steel.
Preferably, the semi-refined molten steel in the step (2) comprises the following components in percentage by mass: 0.060-0.090% of C, 0.80-0.85% of Si, 1.40-1.45% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 0.0025% of N and the balance of iron.
Preferably, the ferrotitanium alloy in step (3) includes Ti70 and Ti 30.
Preferably, the refined molten steel in the step (3) comprises, by mass, 0.060 to 0.100% of C, 0.80 to 0.90% of Si, 1.40 to 1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.0020 to 0.0030% of B, 0.10 to 0.15% of Ti, less than or equal to 0.10% of Cr, less than or equal to 0.10% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.10% of Mo, less than or equal to 0.0020% of O, less than or equal to 0.0030% of.
The invention provides an alloy welding wire steel wire rod which comprises the following chemical components in percentage by mass: 0.060 to 0.100 percent of C, 0.80 to 0.90 percent of Si, 1.40 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, 0.0020 to 0.0030 percent of B, 0.10 to 0.15 percent of Ti, less than or equal to 0.0025 percent of O, less than or equal to 0.0035 percent of N, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of. According to the invention, by optimally designing the chemical component ranges of the wire rod, the welding seam strength of the finished welding wire made of the wire rod is high, the welding bead forming effect is good, and the low-temperature impact absorption power is high and stable. Experimental results show that the alloy welding wire steel wire rod with the specification of 5.5mm provided by the invention is drawn into a welding wire with the specification of 1.2mm, the welding seam strength is high, and the welding seam strength is not less than 615 MPa; high low-temperature impact energy, impact absorption energy at-30 ℃ is more than or equal to 120KV2is/J and stable; the welding bead of the finished welding wire has good forming and slag removing performance.
The production method provided by the invention is simple to operate and suitable for industrial production.
Detailed Description
The invention provides an alloy welding wire steel wire rod which comprises the following chemical components in percentage by mass: 0.060 to 0.100 percent of C, 0.80 to 0.90 percent of Si, 1.40 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, 0.0020 to 0.0030 percent of B, 0.10 to 0.15 percent of Ti, less than or equal to 0.0025 percent of O, less than or equal to 0.0035 percent of N, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of.
According to the mass percentage, the alloy welding wire steel wire rod provided by the invention comprises 0.060-0.100% of C, and preferably 0.080-0.090%. According to the invention, by adding a small amount of carbon element, the strength of the welding seam of the finished welding wire can be ensured on the basis of reducing the dust generation amount.
According to the mass percentage, the alloy welding wire steel wire rod provided by the invention comprises 0.80-0.90% of Si, and preferably 0.85-0.87%. According to the invention, a certain amount of silicon element is added, so that the yield point and tensile strength of the welding line can be improved, and the dust generation amount in the welding process can be reduced by controlling the content of the silicon element within the range.
According to the mass percentage, the alloy welding wire steel wire rod provided by the invention comprises 1.40-1.50% of Mn, and preferably 1.45-1.47%. According to the invention, a certain amount of manganese element is added, so that the yield point and tensile strength of a welding line can be improved, and the dust generation amount in the welding process can be reduced by controlling the content of manganese element within the range.
According to the mass percentage, the alloy welding wire steel wire rod provided by the invention comprises 0.0020-0.0030% of B, and preferably 0.0025-0.0028%. The invention can improve the hardenability of the welding seam and promote the formation of the strengthened structure of the welding seam by introducing trace B element.
According to the mass percentage, the alloy welding wire steel wire rod provided by the invention comprises 0.10-0.15% of Ti, and preferably 0.12-0.13%. According to the invention, a certain amount of titanium element is added, so that the weld joint structure can be refined, the welding heat affected zone is reduced, and the weld joint strength is stabilized.
According to the mass percentage, the alloy welding wire steel wire rod provided by the invention comprises P less than or equal to 0.015 percent, S less than or equal to 0.015 percent, O less than or equal to 0.0025 percent, N less than or equal to 0.0035 percent, Ni less than or equal to 0.10 percent, Cr less than or equal to 0.10 percent, Cu less than or equal to 0.10 percent and Mo less than or equal to 0.10 percent. The invention can further improve the welding effect by reducing the content of impurity elements.
According to the invention, by optimally designing the chemical component ranges of the wire rod, the welding seam strength of the finished welding wire made of the wire rod is high, the welding bead forming effect is good, and the low-temperature impact absorption power is high and stable.
The invention also provides a preparation method of the alloy welding wire steel wire rod in the technical scheme, which comprises the following steps:
(1) sequentially carrying out converter smelting and alloying on the molten iron and the scrap steel to obtain crude molten steel; the molten iron comprises the following chemical components in percentage by mass: less than or equal to 0.040 percent of S, less than or equal to 0.130 percent of P, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of Mo and the balance of Fe; the chemical components of the scrap steel comprise the following components in percentage by mass: less than or equal to 0.040 percent of S, less than or equal to 0.045 percent of P, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of Mo and the balance of Fe; the alloying is to add silicon-manganese alloy and ferrosilicon in turn into the melt obtained by smelting in the converter;
(2) refining the coarse steelmaking liquid obtained in the step (1) to obtain semi-refined molten steel;
(3) sequentially adding ferroboron and ferrotitanium into the semi-refined molten steel obtained in the step (2) to obtain refined molten steel;
(4) casting the refined molten steel obtained in the step (3) to obtain a casting blank;
(5) and (4) rolling the casting blank obtained in the step (4) to obtain the alloy welding wire steel wire rod.
The invention carries out converter smelting and alloying on molten iron and scrap steel in sequence to obtain crude molten steel.
In the invention, the chemical components of the molten iron comprise the following components in percentage by mass: s is less than or equal to 0.040 percent, P is less than or equal to 0.130 percent, Cr is less than or equal to 0.10 percent, Ni is less than or equal to 0.10 percent, Cu is less than or equal to 0.10 percent, Mo is less than or equal to 0.10 percent, and the balance of Fe, preferably S is less than or equal to 0.037 percent, P is less than or equal to 0.125 percent, Ni is less than or equal to 0.05 percent, Cu is less than or equal to 0.05 percent, Mo is less than or equal to 0.03 percent, and the balance of Fe, more preferably S is less than or equal to 0.035 percent, P is less than or equal. The source of the molten iron is not particularly limited in the invention, as long as the chemical components and the content of the molten iron meet the requirements. In the invention, when the chemical composition of the molten iron is within the above range, the requirements of the chemical composition ranges of S, P, Cr, Ni, Cu and Mo elements in the alloy welding wire steel wire rod can be met.
In the invention, the chemical components of the scrap steel comprise the following components in percentage by mass: s is less than or equal to 0.040 percent, P is less than or equal to 0.045 percent, Cr is less than or equal to 0.10 percent, Ni is less than or equal to 0.10 percent, Cu is less than or equal to 0.10 percent, Mo is less than or equal to 0.10 percent, and the balance of Fe, preferably S is less than or equal to 0.035 percent, P is less than or equal to 0.042 percent, Cr is less than or equal to 0.05 percent, Ni is less than or equal to 0.04 percent, Cu is less than or equal to 0.03 percent, Mo is less than or equal to 0.02 percent, and the balance of Fe, more preferably S is less than or equal to 0.029 percent, P is less than or equal. The source of the scrap steel is not specially limited, and the chemical components and the content of the scrap steel can meet the requirements. In the invention, when the chemical composition of the scrap steel is within the above range, the requirements of the chemical composition ranges of S, P, Cr, Ni, Cu and Mo elements in the alloy welding wire steel wire rod can be met.
In the present invention, the mass ratio of the molten iron to the scrap steel is preferably 1: (0.1 to 0.2), more preferably 1: (0.15-0.17). The invention adopts the molten iron and the scrap steel as raw materials, and simultaneously limits the proportion of the molten iron and the scrap steel in the range, thereby ensuring that the smelting end point temperature meets the control range.
In the invention, the converter smelting is preferably carried out in bottom blowing argon; the flow rate of the argon gas is preferably 400-450 Nm3A/min, more preferably 420 to 430Nm3And/min. In the invention, bottom blowing argon is adopted in the whole smelting process of the converter, so that the nitrogen content at the molten steel smelting end point is reduced. The invention has no special limitation on other operations of the converter smelting, and the method only needs to ensure that the melt obtained by the converter smelting contains 0.05-0.06% of C, less than or equal to 0.012% of P, less than or equal to 0.030% of S, less than or equal to 0.10% of Ni, less than or equal to 0.10% of Cu and less than or equal to 0.10% of Cr.
In the present invention, the alloying is preferably carried out during tapping of the melt obtained by converter smelting; the alloying is to add silicon-manganese alloy and ferrosilicon in turn into the melt obtained by smelting in the converter; the alloying time is preferably 1/4 when the melt obtained by converter smelting is tapped 1/5-1/3. The specific components and the dosage of the silicon-manganese alloy and the silicon iron are not specially limited, as long as 0.060-0.070% of C, 0.75-0.80% of Si, 1.35-1.40% of Mn, less than or equal to 0.015% of P, less than or equal to 0.10% of Cr, less than or equal to 0.10% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.10% of Mo and less than or equal to 0.0020% of N in the rough smelting molten steel can be ensured. The invention carries out alloying in the process of melt tapping, can make the components of the alloy more uniform and further reduce the content of impurity elements.
In the present invention, the tapping is preferably carried out by transferring a melt obtained by converter smelting from a furnace to a ladle; the tapping temperature is preferably 1600-1620 ℃, and more preferably 1610 ℃; the tapping time is preferably 3-4 min, and more preferably 3.5 min.
The invention preferably pre-treats the ladle before tapping, preferably by argon evacuation of the ladle. In the invention, the time for evacuating the argon is preferably 1-2 min, and more preferably 1.7 min. In the invention, the air in the steel ladle can be discharged by adopting argon evacuation before tapping, so that the oxygen increase and nitrogen increase of molten steel are reduced.
In the present invention, the ladle is preferably a red ladle which is normally continuously circulated.
In the invention, the raw molten steel preferably comprises the following components in percentage by mass: 0.060-0.070% of C, 0.75-0.80% of Si, 1.35-1.40% of Mn, less than or equal to 0.015% of P, less than or equal to 0.10% of Cr, less than or equal to 0.10% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.10% of Mo, less than or equal to 0.0020% of N, and the balance of iron. In the present invention, when the composition of the raw molten steel is within the above range, the subsequent operation is facilitated.
After the coarse molten steel is obtained, the invention refines the coarse molten steel to obtain semi-refined molten steel.
In the present invention, the refining is preferably performed by adding lime and a diffusion deoxidizer to the raw molten steel in this order.
In the invention, the dosage of the lime is preferably 0.5-0.7% of the mass of the crude molten steel, and more preferably 0.6%. The lime is added into the rough smelting molten steel in order to ensure that the refining slag meets the required alkalinity requirement so as to further remove impurities in the molten steel.
After lime is added, the invention preferably carries out argon blowing stirring and electrode heating on the product obtained by adding the lime in turn; the argon blowing and stirring time is preferably 2-5 min, and more preferably 3 min. The invention has no special limitation on the flow of argon gas in the argon blowing and stirring process, and only needs to ensure that the exposed area of the liquid level of the molten steel is within the range of 300 mm. In the invention, when the argon blowing stirring time is in the range, the refining can be promoted to early form slag, the submerged arc of the refining electrode is convenient, and the oxygen increase and nitrogen increase of the molten steel are reduced.
In the invention, the time for heating the electrode is preferably 10-15 min, and more preferably 10-12 min; the diffusion deoxidizer is preferably added in the electrode heating process; when the diffusion deoxidizer is added, argon blowing and stirring are preferably carried out; the diffusion deoxidizer is preferably ferrosilicon powder, and the usage amount of the ferrosilicon powder is preferably 0.08-0.10% of the mass of the crude molten steel, and more preferably 0.09%. The invention has no special limitation on the flow of argon gas in the argon blowing and stirring process, and only needs to ensure that molten steel is not exposed and the slag surface fluctuates. The operation of heating the electrode is not particularly limited in the present invention, and may be performed by an electrode heating operation known to those skilled in the art. The specific time for adding the diffusion deoxidizer is not specially limited, and the diffusion deoxidizer can be added in the electrode heating process. The components of the ferrosilicon powder are not particularly limited, the generated refining slag can be in an off-white slag state, and the alkalinity of the refining final slag is controlled to be R1.5-2.0, (MnO + FeO) < 1%. The molten steel is refined under the conditions, the molten steel can be prevented from being subjected to oxygen absorption and nitrogen absorption, and the content of inclusions in the molten steel is reduced to the maximum extent.
In the invention, the semi-refined molten steel preferably comprises the following components in percentage by mass: 0.060-0.090% of C, 0.80-0.85% of Si, 1.40-1.45% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 0.0025% of N and the balance of iron, more preferably 0.070-0.080% of C, 0.81-0.83% of Si, 1.41-1.43% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.03-0.05% of Cr, 0.001-0.005% of Ni, 0.01-0.05% of Cu, less than or equal to 0.0025% of N and the balance; the oxygen activity in the semi-refined molten steel is preferably less than or equal to 10ppm, more preferably less than or equal to 8ppm, and even more preferably less than or equal to 6 ppm. In the present invention, when the content of the component of the semi-refined molten steel is within the above range, the content of impurities in the molten steel can be further reduced. And when the components of the semi-refined molten steel do not meet the requirements, adjusting the components according to actual conditions.
After semi-refined molten steel is obtained, ferroboron and ferrotitanium are sequentially added into the semi-refined molten steel to obtain refined molten steel.
In the invention, the temperature of the semi-refined molten steel is preferably 1590-1600 ℃, and more preferably 1593-1598 ℃. According to the invention, by controlling the temperature of the semi-refined molten steel, adverse effects on production operation caused by the subsequent addition of ferroboron and ferrotitanium and temperature drop in the soft blowing process are avoided, the stability control of the casting temperature and the drawing speed of the tundish is realized, and the quality of the casting blank is ensured.
In the invention, the process of sequentially adding ferroboron and ferrotitanium into the semi-refined molten steel is preferably carried out under the condition of argon blowing. The invention has no special limitation on the argon flow in the argon blowing process, and only needs to ensure that the molten steel is not exposed and the slag surface fluctuates. The invention can prevent the molten steel from absorbing oxygen and nitrogen in the process of sequentially adding the ferroboron and the ferrotitanium into the semi-refined molten steel under the condition of argon blowing.
The dosage of the ferroboron alloy is not specially limited, and the mass content of the element B in the molten steel can be within the range of 0.0030-0.0040%. In the invention, the ferroboron is added into the semi-refined molten steel, and the high-potential nitrogen in the local dead zone of the molten steel is removed by using the element B, so that the overall nitrogen content of the molten steel is further reduced.
In the present invention, the ferrotitanium alloy preferably includes Ti70 and Ti 30; the Ti70 is preferably selected from 70-75% of Ti, less than or equal to 2.5% of Al and the balance of Fe in percentage by mass; the Ti30 preferably comprises 30-35% of Ti, less than or equal to 7.5% of Al and the balance of Fe in percentage by mass. The source of the ferrotitanium alloy is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used.
In the invention, the ferrotitanium is preferably added after the ferroboron is added and argon is blown for 3-5 min, and more preferably 4 min; the addition mode of the ferrotitanium alloy is preferably that Ti70 alloy and Ti30 alloy are added in sequence. In the present invention, the Ti70 alloy and the Ti30 alloy are preferably added in amounts of 50% respectively based on the control target range of the chemical element TiAnd (4) adding. According to the invention, Ti70 is added firstly when the ferrotitanium alloy is added, and Ti30 is added for refining, so that the absorptivity of titanium element is improved, and Al in molten steel is reduced2O3The amount of the produced high-price alloy is reduced, and the castability of the molten steel is improved.
According to the invention, the obtained melt is preferably subjected to soft blowing after the ferrotitanium alloy is added, so as to obtain refined molten steel. The invention adopts soft blowing to promote the floating of the inclusion to the maximum extent.
In the invention, the soft blowing time is preferably 12-15 min, and more preferably 13.5 min; the gas used for the soft blowing is preferably argon. The invention has no special limitation on the argon flow in the soft blowing, and only needs to ensure that the molten steel is not exposed and the slag surface fluctuates.
In the invention, the refining molten steel preferably comprises, by mass, 0.060 to 0.10% of C, 0.80 to 0.90% of Si, 1.40 to 1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.0020 to 0.0030% of B, 0.10 to 0.15% of Ti, less than or equal to 0.10% of Cr, less than or equal to 0.10% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.10% of Mo, less than or equal to 0.0020% of O, less than or equal to 0.0030% of N and the balance of iron, more preferably comprises 0.08% of C, 0.85% of Si, 1.45% of Mn, less than or equal to 0.012% of P, less than or equal to 0.010% of S, 0.0020.0030.0% of B, 0.13% of Ti, less than or equal to 0.05% of Cr. In the present invention, when the content of the components of the refined molten steel is within the above range, the content of impurities in the molten steel can be further reduced. When the components of the refining molten steel do not meet the requirements, alloying materials are preferably added into the refining molten steel, and argon is blown softly for 3 min. The specific components and the dosage of the alloying materials are not specially limited, so long as the chemical components of the refined molten steel meet the requirements.
In the invention, the time for obtaining the refined molten steel from the crude steel-making liquid is preferably 40-45 min, and more preferably 43 min. In the invention, when the time for obtaining the refined molten steel from the crude steel-making liquid is in the range, the impurity content can be further reduced, and the components in the molten steel can meet the requirements.
After the refined molten steel is obtained, the invention carries out casting on the refined molten steel to obtain a casting blank.
In the present invention, the operation of casting the refined molten steel is preferably: transferring the refined molten steel to a tundish to obtain tundish molten steel; and casting the tundish molten steel into a crystallizer, and performing secondary cooling by using aerial fog of a continuous casting machine to obtain a casting blank.
The invention preferably transfers the refined molten steel to a tundish to obtain tundish molten steel.
In the invention, when the refined molten steel is transferred to the tundish, a covering agent is preferably added into the tundish; the covering agent preferably comprises the following components in percentage by mass: less than or equal to 2.0 percent of C, 40-43 percent of CaO and SiO2 35～38％、Al2O310-12%, 3-4% of MgO, 2-3% of CaF and the balance of impurities. The specific dosage of the covering agent is not specially limited, and the thickness of the slag surface is controlled to be 20-30 mm. The invention adopts the low-carbon covering agent to prevent the molten steel from contacting with air to cause oxidation.
In the invention, the chemical components of the tundish molten steel are preferably as follows by mass percent: 0.060 to 0.100 percent of C, 0.80 to 0.90 percent of Si, 1.40 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, 0.0020 to 0.0030 percent of B, 0.10 to 0.15 percent of Ti, less than or equal to 0.0025 percent of O, less than or equal to 0.0035 percent of N, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of Mo, less than or equal to 0.010 percent of P, less than or equal to 0.008 percent of S, 0.0020 to 0.0030 percent of B, 0.10 to 0.15 percent of Ti, less than or equal to 0.0025 percent of O, less than or equal to 0.0035 percent of N, less than or equal to 0.030 percent of Cr, less than or equal to.
In the invention, the superheat degree of the tundish molten steel is preferably 15-25 ℃, and more preferably 20 ℃. In the present invention, when the degree of superheat of the tundish molten steel is within the above range, the quality of the cast slab can be further improved.
After the tundish molten steel is obtained, the tundish molten steel is preferably cast into a crystallizer, and is subjected to secondary cooling by the aerial fog of a continuous casting machine to obtain a casting blank.
In the invention, the casting is preferably carried out by adopting a tundish stopper rod argon blowing process. The tundish stopper rod argon blowing process is not particularly limited, and the tundish stopper rod argon blowing process known by persons skilled in the art can be adopted. In the invention, the pouring is carried out by adopting the tundish stopper rod argon blowing process, so that the molten steel can be stirred and purified, the stopper rod can be prevented from being blocked, and the continuous casting production can be carried out more smoothly.
In the present invention, the casting is preferably performed under electromagnetic stirring conditions; the electromagnetic stirring is preferably crystallizer electromagnetic stirring and tail end electromagnetic stirring; the current of the electromagnetic stirring of the crystallizer is preferably 300-320A, and the frequency of the electromagnetic stirring of the crystallizer is preferably 3-7 Hz; the current of the tail end electromagnetic stirring is preferably 300-320A, and the frequency of the tail end electromagnetic stirring is preferably 3-7 Hz; the pulling speed of the casting blank is preferably 2.0-2.2 m/min; the billet of the crystallizer is preferably 160X 160 mm. In the invention, the problem of center segregation and looseness of the casting blank can be solved by adopting a stirring mode combining electromagnetic stirring of the crystallizer and electromagnetic stirring of the tail end.
In the invention, the casting is preferably performed by using the special welding steel casting powder, and the thickness of the special welding steel casting powder is preferably 10-15 mm. In the present invention, the source of the special welding steel mold flux is not particularly limited, and the special welding steel mold flux known to those skilled in the art may be used. The invention adopts the special covering slag for welding steel to protect the molten steel, and can reduce the adsorption of nitrogen and oxygen to the molten steel.
In the invention, the specific water amount of the secondary cooling of the gas mist of the continuous casting machine is preferably 0.45-0.55L/t, and more preferably 0.5L/t. The invention adopts the mode of secondary cooling of gas mist, so that the uniformity of the chemical components in the casting blank can be improved.
After a casting blank is obtained, the casting blank is rolled to obtain the alloy welding wire steel wire rod.
The rolling operation is not particularly limited, and the rolling is carried out according to a steel wire rod process for rolling welding wires. In the invention, the specification of the alloy welding wire steel wire rod is preferably 5.5 mm.
By controlling the operation parameters in the preparation method, the mechanical property of the alloy welding wire steel wire rod is further improved, so that the welding wire made of the wire rod has high welding seam strength, good welding bead forming effect, high and stable low-temperature impact absorption power.
The preparation method provided by the invention is simple to operate and suitable for industrial production.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The production equipment comprises: 80t converter, 80t LF refining furnace, 6 machine/6-strand continuous casting machine (R9m, 160mm),
Figure BDA0003023726370000101
Continuous wire rod rolling production line
Figure BDA0003023726370000102
Specification wire rods;
(1) adding molten iron and scrap steel into a converter for smelting to obtain a melt; argon bottom blowing is carried out in the whole smelting process of the converter, and the bottom blowing flow is 400Nm3/h；
The molten iron comprises the following chemical components in percentage by mass: 0.040% of S, 0.130% of P, 0.05% of Cr, 0.05% of Ni, 0.05% of Cu, 0.02% of Mo and the balance of Fe; the chemical components of the scrap steel are as follows by mass percent: 0.040% of S, 0.040% of P, 0.05% of Cr, 0.04% of Ni, 0.02% of Cu, 0.01% of Mo and the balance of Fe; the mass ratio of the molten iron to the scrap steel is 1: 0.1; 0.05% of C, 0.012% of P, 0.030% of S, 0.05% of Ni, 0.05% of Cu and 0.04% of Cr in the melt;
(2) sequentially adding silicon-manganese alloy and ferrosilicon for alloying when the melt is tapped at 1/4 to obtain rough molten steel; wherein the tapping temperature is 1600 ℃, a red ladle is used for tapping, argon in the ladle is evacuated for 1min before tapping, and the tapping time is 3 min; 0.060% of C, 0.75% of Si, 1.35% of Mn, 0.015% of P, 0.04% of Cr, 0.05% of Ni, 0.05% of Cu, 0.0020% of N and the balance of iron in the rough molten steel;
(3) adding 400kg of lime into the crude steel-making liquid, then blowing argon and stirring, heating an electrode after 3min of argon-blowing and stirring, continuously adding 64kg of ferrosilicon powder in the electrode heating process to carry out slag surface diffusion deoxidation, heating the electrode for 10min, and obtaining semi-refined molten steel with the refining slag alkalinity of R1.5 and the (MnO + FeO) of 0.95 percent;
the using amount of the lime is 0.5 percent of the mass of the rough smelting molten steel; the using amount of the ferrosilicon powder is 0.08 percent of the mass of the rough smelting molten steel; the semi-refined molten steel comprises the following components in percentage by mass: 0.060% of C, 0.80% of Si, 1.40% of Mn, 0.015% of P, 0.015% of S, 0.04% of Cr, 0.0024% of N, 0.005% of Ni, 0.05% of Cu and the balance of iron, wherein the oxygen activity is 10 ppm.
(4) Firstly adding ferroboron into 1590 ℃ semi-refined molten steel, wherein the mass content of the element B in the molten steel is 0.0030%, then sequentially adding Ti70 alloy and Ti30 alloy after soft argon blowing is carried out for 3min, and then carrying out soft argon blowing for 12min to obtain refined molten steel;
wherein the refining molten steel comprises, by mass, 0.060% of C, 0.80% of Si, 1.40% of Mn, 0.015% of P, 0.015% of S, 0.0030% of B, 0.10% of Ti, 0.04% of Cr, 0.005% of Ni, 0.05% of Cu, 0.0020% of O, 0.0028% of N, and the balance of Fe;
the time for obtaining refined molten steel from the crude steel-making liquid is 40 min;
(5) casting the refined molten steel by adopting a tundish stopper rod argon blowing process to obtain a casting blank;
the specific operation is to transfer the refined molten steel to a tundish to obtain tundish molten steel; casting the tundish molten steel into a crystallizer, and carrying out secondary cooling by using aerial fog of a continuous casting machine to obtain a casting blank;
wherein, when the refined molten steel is transferred to a tundish, a covering agent is added into the tundish, and the covering agent comprises the following components in percentage by mass: 1.5 percent of C, 40 percent of CaO, and SiO237％、Al2O312％、MgO 4 percent, 3 percent of CaF and the balance of impurities, controlling the thickness of the slag surface to be 20mm, and controlling the superheat degree of the tundish molten steel to be 15 ℃; the tundish molten steel comprises the following chemical components in percentage by mass: 0.060% of C, 0.80% of Si, 1.40% of Mn, 0.015% of P, 0.015% of S, 0.0030% of B, 0.10% of Ti, 0.0025% of O, 0.0033% of N, 0.04% of Cr, 0.005% of Ni, 0.05% of Cu and the balance of Fe;
electromagnetic stirring of a crystallizer and electromagnetic stirring of the tail end are adopted during casting; the current of the electromagnetic stirring of the crystallizer is 300A, and the frequency is preferably 3 Hz; the current of the electromagnetic stirring at the tail end is 320A, and the frequency is 7 Hz; the casting blank pulling speed is 2.0 m/min; the special protective slag for welding steel is adopted, and the thickness of a slag layer of the crystallizer is controlled to be 10 mm; the specific water amount is 0.5L/ton;
(6) rolling the casting blank according to a steel wire rod process for rolling welding wires to obtain an alloy welding wire steel wire rod with the specification of 5.5 mm;
the alloy welding wire steel wire rod comprises the following chemical components in percentage by mass: 0.060% of C, 0.80% of Si, 1.40% of Mn, 0.015% of P, 0.015% of S, 0.0030% of B, 0.10% of Ti, 0.0025% of O, 0.0033% of N, 0.04% of Cr, 0.005% of Ni, 0.05% of Cu and the balance of Fe.
Example 2
The production equipment comprises: 80t converter, 80t LF refining furnace, 6 machine/6-strand continuous casting machine (R9m, 160mm),
Figure BDA0003023726370000121
Continuous wire rod rolling production line
Figure BDA0003023726370000122
Specification wire rods;
(1) adding molten iron and scrap steel into a converter for smelting to obtain a melt; argon bottom blowing is carried out in the whole smelting process of the converter, and the bottom blowing flow is 420Nm3/h；
The molten iron comprises the following chemical components in percentage by mass: 0.037% of S, 0.125% of P, 0.04% of Cr, 0.03% of Ni, 0.02% of Cu, 0.03% of Mo and the balance of Fe; the chemical components of the scrap steel are as follows by mass percent: 0.035% of S, 0.042% of P, 0.03% of Cr, 0.03% of Ni, 0.01% of Cu, 0.02% of Mo and the balance of Fe; the mass ratio of the molten iron to the scrap steel is 1: 0.15; 0.055% of C, 0.01% of P, 0.025% of S, 0.03% of Ni, 0.04% of Cu and 0.05% of Cr in the melt;
(2) sequentially adding silicon-manganese alloy and ferrosilicon for alloying when the melt is tapped at 1/4 to obtain rough molten steel; wherein the tapping temperature is 1610 ℃, a red ladle is used for tapping, argon in the ladle is evacuated for 1.7min before tapping, and the tapping time is 4 min; 0.065% of C, 0.77% of Si, 1.37% of Mn, 0.012% of P, 0.05% of Cr, 0.03% of Ni, 0.03% of Cu, 0.0018% of N and the balance of Fe in the primary molten steel;
(3) adding 480kg of lime into the crude steel-making liquid, then blowing argon for stirring, heating an electrode after 3min of argon blowing stirring, and continuously adding 72kg of ferrosilicon powder in the electrode heating process for diffusion deoxidation of slag surface, heating the electrode for 12min, wherein the alkalinity of refined slag is R1.7, (MnO + FeO) is 0.80 percent, and thus obtaining semi-refined molten steel;
the using amount of the lime is 0.60 percent of the mass of the rough smelting molten steel; the using amount of the ferrosilicon powder is 0.09 percent of the mass of the rough smelting molten steel; the semi-refined molten steel comprises the following components in percentage by mass: 0.080% of C, 0.83% of Si, 1.43% of Mn, 0.012% of P, 0.010% of S, 0.05% of Cr, 0.0022% of N, 0.003% of Ni, 0.03% of Cu and the balance of iron, wherein the oxygen activity is 6 ppm;
(4) firstly adding ferroboron into 1593 ℃ semi-refined molten steel, ensuring that the mass content of the element B in the molten steel is 0.0035%, then sequentially adding Ti70 alloy and Ti30 alloy after soft argon blowing is carried out for 3min, and then carrying out soft argon blowing for 13.5min to obtain refined molten steel;
the refining molten steel comprises, by mass, 0.080% of C, 0.85% of Si, 1.45% of Mn, 0.012% of P, 0.010% of S, 0.05% of Cr, 0.0035% of B, 0.13% of Ti, 0.003% of Ni, 0.03% of Cu, 0.0018% of O, 0.0027% of N and the balance of Fe;
the time for obtaining refined molten steel from the crude steel-making liquid is 43 min;
(5) casting the refined molten steel by adopting a tundish stopper rod argon blowing technology to obtain a casting blank;
the specific operation is to transfer the refined molten steel to a tundish to obtain tundish molten steel; casting the tundish molten steel into a crystallizer, and carrying out secondary cooling by using aerial fog of a continuous casting machine to obtain a casting blank;
wherein, when the refined molten steel is transferred to a tundish, a covering agent is added into the tundish, and the covering agent comprises the following components in percentage by mass: c1.8%, CaO 43%, SiO235％、Al2O310 percent, 3.5 percent of MgO, 3 percent of CaF and the balance of impurities, controlling the thickness of the slag surface to be 20mm, and controlling the superheat degree of the tundish molten steel to be 25 ℃; the tundish molten steel comprises the following chemical components in percentage by mass: 0.08 percent of C, 0.85 percent of Si, 1.45 percent of Mn, 0.012 percent of P, 0.01 percent of S, 0.05 percent of Cr, 0.0035 percent of B, 0.13 percent of Ti, 0.003 percent of Ni, 0.03 percent of Cu, 0.0021 percent of O, 0.0031 percent of N and the balance of iron;
electromagnetic stirring of a crystallizer and electromagnetic stirring of the tail end are adopted during casting; the current of the electromagnetic stirring of the crystallizer is 30A, and the frequency is preferably 3 Hz; the current of the electromagnetic stirring at the tail end is 320A, and the frequency is 7 Hz; the pulling speed of the crystallizer is 2.0 m/min; adopting special protective slag for welding steel, and controlling the thickness of a crystallizer slag layer to be 13 mm; the specific water amount is 0.5L/ton;
(6) rolling the casting blank according to a steel wire rod process for rolling welding wires to obtain an alloy welding wire steel wire rod with the specification of 5.5 mm; the alloy welding wire steel wire rod comprises the following chemical components in percentage by mass: 0.080% of C, 0.85% of Si, 1.45% of Mn, 0.012% of P, 0.010% of S, 0.05% of Cr, 0.0035% of B, 0.13% of Ti, 0.003% of Ni, 0.03% of Cu, 0.0021% of O, 0.0031% of N and the balance of iron.
Example 3
The production equipment comprises: 80t converter, 80t LF refining furnace, 6 machine/6-strand continuous casting machine (R9m, 160mm),
Figure BDA0003023726370000131
Continuous wire rod rolling production line
Figure BDA0003023726370000132
Specification wire rods;
(1) molten iron and scrap steel are added into a converter for smeltingRefining to obtain a melt; argon bottom blowing is carried out in the whole smelting process of the converter, and the bottom blowing flow is 450Nm3/h；
The molten iron comprises the following chemical components in percentage by mass: 0.035% of S, 0.116% of P, 0.03% of Cr, 0.02% of Ni, 0.04% of Cu, 0.02% of Mo and the balance of Fe; the chemical components of the scrap steel are as follows by mass percent: 0.029% of S, 0.045% of P, 0.03% of Cr, 0.02% of Ni, 0.03% of Cu, 0.01% of Mo and the balance of Fe; the mass ratio of the molten iron to the scrap steel is 1: 0.2; 0.06% of C, 0.008% of P, 0.02% of S, 0.01% of Ni, 0.01% of Cu and 0.03% of Cr in the melt;
(2) sequentially adding silicon-manganese alloy and ferrosilicon for alloying when the melt is tapped at 1/4 to obtain rough molten steel; wherein the tapping temperature is 1620 ℃, a red ladle is used for tapping, argon in the ladle is evacuated for 2min before tapping, and the tapping time is 3.5 min; 0.07% of C, 0.80% of Si, 1.40% of Mn, 0.01% of P, 0.03% of Cr, 0.01% of Ni, 0.01% of Cu, 0.0017% of N and the balance of iron in the primary molten steel;
(3) adding 560kg of lime into the crude steel-making liquid, then blowing argon and stirring, heating an electrode after 3min of argon-blowing and stirring, adding 80kg of ferrosilicon powder in the electrode heating process to diffuse and deoxidize the slag surface, heating the electrode for 15min, and obtaining semi-refined molten steel with the refining slag alkalinity of R2.0 and the (MnO + FeO) of 0.75 percent;
the using amount of the lime is 0.7 percent of the mass of the rough smelting molten steel; the using amount of the ferrosilicon powder is 0.10 percent of the mass of the rough smelting molten steel; the semi-refined molten steel comprises the following components in percentage by mass: 0.090% of C, 0.85% of Si, 1.45% of Mn, 0.01% of P, 0.008% of S, 0.03% of Cr, 0.0019% of N, 0.001% of Ni, 0.01% of Cu and the balance of Fe, wherein the oxygen activity is 7 ppm;
(4) firstly adding ferroboron into semi-refined molten steel at 1600 ℃ to ensure that the mass content of B in the molten steel is 0.0040%, sequentially adding Ti70 alloy and Ti30 alloy after soft argon blowing is carried out for 5min, then carrying out soft argon blowing for 12min, supplementing alloy materials, adjusting the chemistry to a target control range, and increasing the soft blowing time for 3min to obtain refined molten steel;
the refining molten steel comprises, by mass, 0.10% of C, 0.90% of Si, 1.50% of Mn, 0.010% of P, 0.008% of S, 0.03% of Cr, 0.0030% of B, 0.15% of Ti, 0.001% of Ni, 0.01% of Cu, 0.0016% of O, 0.0023% of N, and the balance of Fe;
the time for obtaining refined molten steel from the crude steel-making liquid is 45 min;
(5) blowing argon by a tundish stopper rod to the refined molten steel for casting to obtain a casting blank;
the specific operation is to transfer the refined molten steel to a tundish to obtain tundish molten steel; casting the tundish molten steel into a crystallizer, and carrying out secondary cooling by using aerial fog of a continuous casting machine to obtain a casting blank;
wherein, when the refined molten steel is transferred to a tundish, a covering agent is added into the tundish, and the covering agent comprises the following components in percentage by mass: c2.0%, CaO 42%, SiO236％、Al2O311 percent of MgO, 3 percent of CaF and the balance of impurities, controlling the thickness of the slag surface to be 30mm, and controlling the superheat degree of the tundish molten steel to be 25 ℃; the tundish molten steel comprises the following chemical components in percentage by mass: 0.10% of C, 0.90% of Si, 1.50% of Mn, 0.01% of P, 0.008% of S, 0.03% of Cr, 0.0030% of B, 0.15% of Ti, 0.001% of Ni, 0.01% of Cu, 0.0023% of O, 0.0028% of N and the balance of iron;
electromagnetic stirring of a crystallizer and electromagnetic stirring of the tail end are adopted during casting; the current of the electromagnetic stirring of the crystallizer is 300A, and the frequency is preferably 3 Hz; the current of the electromagnetic stirring at the tail end is 320A, and the frequency is 7 Hz; the pulling speed of the crystallizer is 2.0 m/min; the special protective slag for welding steel is adopted, and the thickness of a crystallizer slag layer is controlled to be 15 mm; the specific water amount is 0.5L/ton;
(6) rolling the casting blank according to a steel wire rod process for rolling welding wires to obtain an alloy welding wire steel wire rod with the specification of 5.5 mm; the alloy welding wire steel wire rod comprises the following chemical components in percentage by mass: 0.100% of C, 0.90% of Si, 1.50% of Mn, 0.010% of P, 0.008% of S, 0.03% of Cr, 0.0030% of B, 0.15% of Ti, 0.001% of Ni, 0.01% of Cu, 0.0023% of O, 0.0028% of N and the balance of iron.
The alloy welding wire steel wire rod with the specification of 5.5mm prepared in the embodiment 1-3 is made into a finished welding wire with the diameter of 1.2mm through mechanical dephosphorization, drawing and copper plating. The welding performance of the finished welding wire is tested (GB/T25776-.
Table 1 results of performance testing
Figure BDA0003023726370000151
As can be seen from Table 1, the finished welding wire made of the alloy welding wire steel wire rod provided by the invention has the advantages of high stability of welding line mechanical properties, strong low-temperature impact absorption energy, good welding bead forming and slag removing performance and good welding effect.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. An alloy welding wire steel wire rod comprises the following chemical components in percentage by mass: 0.060 to 0.100 percent of C, 0.80 to 0.90 percent of Si, 1.40 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, 0.0020 to 0.0030 percent of B, 0.10 to 0.15 percent of Ti, less than or equal to 0.0025 percent of O, less than or equal to 0.0035 percent of N, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of.
2. An alloy wire steel wire rod according to claim 1, wherein the chemical composition in mass percent is: 0.080% of C, 0.85% of Si, 1.45% of Mn, less than or equal to 0.010% of P, less than or equal to 0.008% of S, 0.0020-0.0030% of B, 0.10-0.15% of Ti, less than or equal to 0.0025% of O, less than or equal to 0.0035% of N, less than or equal to 0.10% of Cr, less than or equal to 0.001% of Ni, 0.10% of Cu, less than or equal to 0.10% of Mo, and the.
3. The method for preparing the alloy welding wire steel wire rod of claim 1 or 2, comprising the following steps:
(1) sequentially carrying out converter smelting and alloying on the molten iron and the scrap steel to obtain crude molten steel; the molten iron comprises the following chemical components in percentage by mass: less than or equal to 0.040 percent of S, less than or equal to 0.130 percent of P, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of Mo and the balance of Fe; the chemical components of the scrap steel comprise the following components in percentage by mass: less than or equal to 0.040 percent of S, less than or equal to 0.045 percent of P, less than or equal to 0.10 percent of Cr, less than or equal to 0.10 percent of Ni, less than or equal to 0.10 percent of Cu, less than or equal to 0.10 percent of Mo and the balance of Fe; the alloying is to add silicon-manganese alloy and ferrosilicon in turn into the melt obtained by smelting in the converter;
(2) refining the coarse steelmaking liquid obtained in the step (1) to obtain semi-refined molten steel;
(3) sequentially adding ferroboron and ferrotitanium into the semi-refined molten steel obtained in the step (2) to obtain refined molten steel;
(4) casting the refined molten steel obtained in the step (3) to obtain a casting blank;
(5) and (4) rolling the casting blank obtained in the step (4) to obtain the alloy welding wire steel wire rod.
4. The preparation method according to claim 3, wherein the mass ratio of the molten iron to the scrap steel in the step (1) is 1: (0.1-0.2).
5. The preparation method according to claim 3, wherein the raw molten steel in the step (1) comprises the following components in percentage by mass: 0.060-0.070% of C, 0.75-0.80% of Si, 1.35-1.40% of Mn, less than or equal to 0.015% of P, less than or equal to 0.10% of Cr, less than or equal to 0.10% of Ni, less than or equal to 0.10% of Cu, less than or equal to 0.10% of Mo, less than or equal to 0.0020% of N, and the balance of iron.
6. The method according to claim 3, wherein the refining in the step (2) is performed by sequentially adding lime and a diffusion deoxidizer to the raw molten steel.
7. The preparation method of claim 6, wherein the amount of lime is 0.5-0.7% of the mass of the raw molten steel; the diffusion deoxidizer is ferrosilicon powder, and the dosage of the ferrosilicon powder is 0.08-0.10% of the mass of the crude molten steel.
8. The method according to claim 3, wherein the semi-refined molten steel in the step (2) comprises the following components in percentage by mass: 0.060-0.090% of C, 0.80-0.85% of Si, 1.40-1.45% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 0.0025% of N and the balance of iron.
9. The method according to claim 3, wherein the ferrotitanium alloy in the step (3) comprises Ti70 and Ti 30.
10. The method according to claim 3, wherein the refined molten steel in the step (3) contains, in mass%, 0.060 to 0.100% C, 0.80 to 0.90% Si, 1.40 to 1.50% Mn, 0.015% or less P, 0.015% or less S, 0.0020 to 0.0030% B, 0.10 to 0.15% Ti, 0.10% or less Cr, 0.10% or less Ni, 0.10% or less Cu, 0.10% or less Mo, 0.0020% or less O, 0.0030% or less N, and the balance Fe.
CN202110409846.0A 2021-04-16 2021-04-16 Alloy welding wire steel wire rod and preparation method thereof Withdrawn CN113106349A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113798729A (en) * 2021-09-23 2021-12-17 包头钢铁（集团）有限责任公司 Rare earth solid welding wire with excellent low-temperature impact toughness

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113798729A (en) * 2021-09-23 2021-12-17 包头钢铁（集团）有限责任公司 Rare earth solid welding wire with excellent low-temperature impact toughness

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