CN112853209B - Zr-containing welding wire steel hot-rolled wire rod and production process thereof - Google Patents

Zr-containing welding wire steel hot-rolled wire rod and production process thereof Download PDF

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CN112853209B
CN112853209B CN202011640406.8A CN202011640406A CN112853209B CN 112853209 B CN112853209 B CN 112853209B CN 202011640406 A CN202011640406 A CN 202011640406A CN 112853209 B CN112853209 B CN 112853209B
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steel
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wire rod
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CN112853209A (en
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郭峰
刘一龙
李超
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Suzhou Qiji Welding Material Co.,Ltd.
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Jiangsu Yonggang Group Co Ltd
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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
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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

Abstract

The invention provides a hot-rolled wire rod of Zr-containing welding wire steel and a production process thereof, wherein the hot-rolled wire rod comprises the following chemical components in percentage by weight: c is less than or equal to 0.06%, Si: 0.45-0.55%, Mn: 0.95-1.05%, P is less than or equal to 0.020%, S: less than or equal to 0.018%, Cr: less than or equal to 0.10 percent, Ni: less than or equal to 0.10 percent, Cu: less than or equal to 0.20, Mo: 0.10 or less, V: not more than 0.02，Ti: 0.07 to 0.13%, Al: 0.06-0.12%, Zr: 0.03 to 0.09 percent, and the balance of Fe and inevitable impurities. By adopting reasonable LF slagging and deoxidizing process, adding mode and time of ferrozirconium alloy and other measures, the Zr content in the molten steel is ensured to meet the standard requirement. The method avoids the nodulation phenomenon of the molten steel in the casting process by adopting reasonable continuous casting process parameters, tundish covering slag, protective casting measures and other measures, and ensures the normal casting of the molten steel. The invention solves the problems of Zr alloying and control of the pouring process of the continuous casting small square billet in the production process of the welding wire steel.

Description

Zr-containing welding wire steel hot-rolled wire rod and production process thereof
Technical Field
The invention relates to the technical field of welding wires and metallurgy, in particular to a hot-rolled wire rod of Zr-containing welding wire steel and a production process thereof.
Background
The wire rod is used for producing a gas shielded solid welding wire with phi 0.8-phi 2.0mm, has excellent welding process performance, can be welded at all positions, has attractive weld joint formation, and has excellent anti-cracking performance and higher low-temperature impact toughness. The method is mainly used for pipeline and nuclear power engineering, such as single-pass or multi-pass welding of carbon steel and low alloy steel with 450 or 500 MPa-grade strength.
The steel is added with deoxidizing elements such as Al, Ti, Zr and the like, has higher resistance to rust or dirt on the surface of steel, and can also be used for the rescue welding of boilers and pipelines. However, Zr is similar to Ti and Al elements, is easy to react with nitrogen and oxygen, and has higher melting point of corresponding inclusions (ZrO)2The melting point reaches 2700 ℃), the inclusions can block a water gap, the alloy elements such as Al, Ti, Zr and the like are simultaneously added into steel, the molten steel has poor liquidity, the steel making and continuous casting production are difficult to control, particularly the casting production difficulty of small square billets is extremely high, the prior domestic Tai steel and northeast special steel produce the die-cast steel ingot with 'two fire materials', but the I adopts the continuous casting of 'one fire material', and the production cost has obvious advantages. Therefore, the research on the smelting and pouring production process of the steel grade is very important, and mainly comprises the problems of a converter tapping deoxidation alloying process, an LF refining deoxidation slagging process, a Zr alloying process and a continuous casting billet production process.
Disclosure of Invention
Aiming at the technical problems, the invention provides the hot-rolled wire rod of the Zr-containing welding wire steel and the production process thereof, which ensure that the Zr content in the molten steel is controlled to meet the standard requirement by adopting the reasonable LF slagging and deoxidizing process, the adding mode and the time of the ferrozirconium alloy and other means. The method avoids the nodulation phenomenon of the molten steel in the casting process by adopting reasonable continuous casting process parameters, tundish covering slag, protective casting measures and other measures, and ensures the normal casting of the molten steel. The invention solves the problems of Zr alloying and control of the pouring process of the continuous casting small square billet in the production process of the welding wire steel.
The hot rolled wire rod of the Zr-containing welding wire steel comprises the following chemical components in percentage by weight: c is less than or equal to 0.06%, Si: 0.45-0.55%, Mn: 0.95-1.05%, P is less than or equal to 0.020%, S: less than or equal to 0.018%, Cr: less than or equal to 0.10 percent, Ni: less than or equal to 0.10 percent, Cu: less than or equal to 0.20, Mo: 0.10 or less, V: less than or equal to 0.02, Ti: 0.07 to 0.13%, Al: 0.06-0.12%, Zr: 0.03 to 0.09 percent, and the balance of Fe and inevitable impurities.
Preferably, the chemical components are as follows according to weight percentage: 0.06% of C, 0.52% of Si, 0.99% of Mn0.010% of P, 0.001% of S, 0.03% of Cr, 0.010% of Ni, 0.013% of Cu, 0.004% of Mo, 0.004% of V, 0.10% of Ti, 0.07% of Al, 0.06% of Zr0.06% and the balance of Fe and inevitable impurities.
Preferably, the chemical components are as follows according to weight percentage: 0.06% of C, 0.52% of Si, 0.98% of Mn0.98%, 0.012% of P, 0.002% of S, 0.03% of Cr, 0.007% of Ni, 0.011% of Cu, 0.004% of Mo, 0.001% of V, 0.12% of Ti, and Al: 0.09%, Zr: 0.03%, and the balance of Fe and inevitable impurities.
Preferably, the chemical components are as follows according to weight percentage: 0.06% of C, 0.55% of Si, 0.97% of Mn0.014% of P, 0.001% of S, 0.04% of Cr, 0.008% of Ni, 0.010% of Cu, 0.004% of Mo, 0.003% of V, 0.08% of Ti, Al: 0.09%, Zr: 0.05%, and the balance of Fe and inevitable impurities.
A production process of hot rolled wire rods of Zr-containing welding wire steel comprises the following steps:
step S1, converter smelting deoxidation alloying: controlling tapping components: c is less than or equal to 0.03 percent, P is less than or equal to 0.010 percent, and the tapping temperature is more than or equal to 1620 ℃; deoxidizing and alloying during tapping, wherein the sequence and the weight of the added alloy are as follows: 3.2-4.0kg/t of aluminum ingot is added for pre-deoxidation after tapping 1/3, and 13-14kg/t of high silicon manganese silicon and 0.5-1.0kg/t of silicon iron are added for alloying; 5.5-6.5kg/t lime and 3-4kg/t calcium aluminate slag making material are added at one time after the steel is tapped 2/3 to form refined primary slag;
step S2, LF refining:
1) replenishing slag making materials after an LF refining furnace enters a station, wherein the components of the slag making materials are 4-8kg/t lime and 0-3kg/t fluorite, so that the slag has good fluidity and the alkalinity R is 2.0-5.0; in the refining process, aluminum beans and ferrosilicon powder are subjected to diffusion deoxidation according to the weight percentage of 1:2, and are added on the slag surface for multiple times in small amount, and the total adding amount is 0.5-1.0 kg/t; adjusting Al content with aluminum wire at early stage, and controlling target value at 0.08-0.13%;
2) zr alloying: fine adjustment is carried out on components by using high-silicon manganese, medium-carbon ferromanganese and ferrosilicon to ensure that the components in the molten steel reach the standard, wherein C is less than or equal to 0.06%, Si is 0.45-0.55%, Mn is 0.95-1.05%, S is less than or equal to 0.003%, Al is 0.08-0.13%, after the components are qualified and the temperature reaches 1620-1650, 1.0kg/t of ferrozirconium alloy (iron barreled) is added at one time, 4.5-5.5m/t ferrotitanium core-spun yarns are fed at a yarn feeding speed of 3-5m/S, and finally, calcium silicate yarns are fed for calcium treatment at 2-3 m/t; adjusting the flow of argon gas during wire feeding to ensure that molten steel is not exposed; the exit temperature is 1600-1620 ℃;
3) after LF is out of the station, soft argon blowing is carried out on the molten steel, the argon flow is 10-40NL/min, the soft blowing time is more than or equal to 5 minutes, and ladle casting is carried out after titanium wires are fed and strictly controlled within 20 min;
step S3, casting and producing a casting blank:
1) the method comprises the following steps of pouring by a steel water continuous casting machine, starting a steel ladle sliding plate to open and pour after argon purging is carried out on a tundish impact area and among various streams before the opening and pouring, wherein the opening and pouring temperature is 1558-1578 ℃, the target superheat degree is 40-60 ℃, the pulling speed is controlled to be 1.9-2.5 m/min, the water flow of a crystallizer is 1850L/min, the electromagnetic stirring parameters of the crystallizer are 400A and 4Hz, the electromagnetic stirring parameters at the tail end are 500A and 10Hz, and the secondary cooling specific water flow is 0.8-1.0L/kg, and the whole process of pouring is protected and poured;
2) in the last stage of LF furnace refining, after the components are qualified by fine adjustment and the temperature reaches 1620-1650 ℃, 1.0kg/t of ferrozirconium alloy (iron barreled) is added at one time, and then 4.5-5.5m/t of ferrotitanium core-spun yarn is fed at the wire feeding speed of 3-5m/s, the refining is performed deep deoxidation in the early stage, the lower oxygen content is controlled, the zirconium content is controlled at 0.03-0.06%, the titanium content is controlled at 0.08-0.12%, and the yield of zirconium and titanium elements is stabilized;
step S4, controlled rolling and controlled cooling and wire rod rolling are carried out to obtain a hot-rolled wire rod;
and S5, inspecting the hot-rolled wire rod, packaging and warehousing.
In the scheme, the feeding speed of the ferrotitanium cored wire in the step S2 is 3-5 m/S.
In the scheme, the carbon-free covering agent and the carbonized rice hulls are added for heat preservation after the silicon-calcium wires are fed in the step S2.
In the scheme, the step S3 adopts a stopper rod integral nozzle ladle and uses low-carbon steel covering slag.
Further, before casting in the step S3, argon blowing operation is performed on the tundish, and after argon blowing is performed for 1-2 minutes, a steel ladle sliding plate is started to perform casting; the tundish adopts a stopper rod integral nozzle ladle, uses a tundish heat-insulating covering agent and strictly prohibits the use of carbonized rice husks; cleaning the long water gap before pouring the ladle, adding a sealing gasket, sleeving the long water gap, and then pouring, so as to ensure that the argon sealing of the long water gap is normal, controlling the insertion depth of the submerged water gap to be 80-140 mm, and strictly forbidding bias flow; starting up a first round of tundish, wherein the liquidus temperature of the tundish temperature is 1518 ℃, and the superheat degree is 40-60 ℃; the low-carbon steel protective slag is used, the pouring process is orderly added, less added and uniformly added, and slag rings are picked according to the requirements of the situation to keep the liquid level of the crystallizer stable; and inspecting the casting blank, and carrying out coping treatment on the continuous casting blank with serious surface defects.
In the foregoing scheme, in step S4: the initial rolling temperature is 1000-1060 ℃, the finish rolling temperature is 880-920 ℃, the MINI rolling mill is 900-940 ℃, the spinning temperature is 860-900 ℃, and the heat preservation cover and the fan are all closed.
Compared with the prior art, the invention has the beneficial effects that:
the invention improves the yield of Zr element, deeply deoxidizes and reduces ZrO2High-melting-point inclusions are generated, the removal effect is improved, and nodulation is reduced; the production process of the invention controls the chemical components of the product and has stable mechanical properties. According to the invention, the end point carbon content of the converter is controlled, calcium carbide and silicon carbide are strictly forbidden to be used for deoxidation in the refining process, a carbon-free covering agent and carbonized rice hulls are added for heat preservation after wire feeding, and a carbon-free covering agent is adopted for heat preservation in a tundish, so that the recarburization of molten steel in the smelting and pouring processes is reduced. In the early stage of refining, a proper amount of aluminum wires are selected for deoxidation alloying, ferrosilicon powder and aluminum beans are diffused and deoxidized to produce white slag, calcium carbide and silicon carbide are strictly forbidden to be used, the white slag time is more than or equal to 10 minutes, and the S in steel is further reduced]And gas content. The Zr alloying of the invention: ensuring the wire feeding speed to be 3-5 m/s; and in the final stage of refining, when the contents of C, Si, Mn, P, S and Al meet the target range, adding ferrozirconium alloy FeZr80 once, and feeding ferrotitanium cored wire FeTi70 once again with the reference wire feeding amount of 4.5-5.5m/t, so that the yield of Ti and Zr is improved, and the argon flow is adjusted during wire feeding to ensure that molten steel is not exposed. The invention properly improves the amount of refining slag, adjusts the soft blowing flow and time after Zr alloying, ensures the uniformity of Al, Ti and Zr elements in steel and reduces the secondary oxidation of the elements. The invention properly increases the pouring temperature to relieve the problem of molten steel nodulation. The invention makes and fitsThe product quality is ensured by the processes of blank heating and wire rod rolling.
Drawings
FIG. 1 is a graph comparing the results of tensile strength and reduction of area for an embodiment of the present invention.
FIG. 2 is a low magnification photograph of a Zr-containing wire steel casting blank pickling according to an embodiment of the present invention, in which FIG. 2(a) is a low magnification photograph of a Zr-containing wire steel casting blank pickling according to example 1, and FIG. 2(b) is a low magnification photograph of a Zr-containing wire steel casting blank pickling according to example 3.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example 1
The Zr-containing welding wire steel hot-rolled wire rod comprises the following chemical components in percentage by weight: 0.06% of C, 0.52% of Si, 0.99% of Mn0.010% of P, 0.001% of S, 0.03% of Cr, 0.010% of Ni, 0.013% of Cu, 0.004% of Mo, 0.004% of V, 0.10% of Ti, 0.07% of Al, 0.06% of Zr0.06% and the balance of Fe and inevitable impurities.
A production process of hot rolled wire rods of Zr-containing welding wire steel comprises the following steps:
step S1, converter smelting deoxidation alloying:
controlling tapping components: c: 0.023%, P: 0.007%, tapping temperature: 1620 ℃; deoxidizing and alloying during tapping, wherein the sequence and the weight of the added alloy are as follows: 3.4kg/t of aluminum ingot is added for pre-deoxidation after tapping 1/3, and 13kg/t of high silicon manganese silicon and 1.0kg/t of silicon iron are added for alloying; 6.0kg/t of lime and 3.5kg/t of calcium aluminate slag-making materials are added at one time after the steel is tapped 2/3 to form refined primary slag;
step S2, LF refining:
1) replenishing slag making materials after an LF refining furnace enters a station, wherein the slag making materials comprise 4kg/t lime and 0kg/t fluorite, so that the slag has good fluidity and the alkalinity R is 3.0; in the refining process, aluminum beans and ferrosilicon powder are adopted to carry out diffusion deoxidation according to the weight percentage of 1:2, and are added on the slag surface for multiple times in small amount, and the total adding amount is 0.8 kg/t; adjusting the Al content by using an aluminum wire in the early stage, and controlling the target value to be 0.10%;
2) zr alloying: fine adjustment is carried out on components by using high-silicon silicomanganese or medium-carbon ferromanganese and ferrosilicon to ensure that the components in the molten steel reach the standard, wherein C is less than or equal to 0.06%, Si is 0.45%, Mn is 1.01%, S: 0.002% of Al and 0.12% of Al, after the components are qualified and the temperature reaches 1620, firstly adding 1.0kg/t of ferrozirconium alloy (iron barreled) at one time, feeding 5m/t of ferrotitanium core-spun yarn at the yarn feeding speed of 3m/s, feeding 5m/s of ferrotitanium core-spun yarn, and finally feeding 2.5m/t of calcium silicate yarn for calcium treatment; adjusting the flow of argon gas during wire feeding to ensure that molten steel is not exposed; the outbound temperature is 1600 ℃; feeding silicon-calcium wires, adding a carbon-free covering agent and carbonized rice hulls, and preserving heat;
3) after LF is out of the station, soft argon blowing is carried out on the molten steel, the argon flow is 30NL/min, the soft blowing time is more than or equal to 5 minutes, and ladle casting is strictly controlled within 20 minutes after titanium wires are fed;
step S3, casting and producing a casting blank:
1) the method comprises the following steps of pouring by a steel water continuous casting machine, starting a steel ladle sliding plate to open and pour after argon purging is carried out on a tundish impact area and among various streams before the opening and pouring, wherein the opening and pouring temperature is 1558 ℃, the target superheat degree is 50 ℃, the pulling speed is controlled at 2.2m/min, the water flow of a crystallizer is 1850L/min, the electromagnetic stirring parameters of the crystallizer are 400A and 4Hz, the electromagnetic stirring parameters at the tail end are 500A and 10Hz, the secondary cooling specific water flow is 0.9L/kg, and the whole process of pouring protects pouring;
2) in the final stage of LF furnace refining, the components are fine-tuned to be qualified, the temperature is 1620 ℃, 1.0kg/t of ferrozirconium alloy (iron barreled) is added at one time, then 5.5m/t of ferrotitanium core-spun yarn is fed at a wire feeding speed of 5m/s, the target early stage refining is performed for deep deoxidation, the lower oxygen content is controlled, finally, the zirconium content is controlled at 0.06%, the titanium content is controlled at 0.10%, and the yield of zirconium and titanium elements is stabilized;
blowing argon into the tundish before casting, and starting a sliding plate of the ladle for casting after blowing argon for 1-2 minutes; the tundish adopts a stopper rod integral nozzle ladle, uses a tundish heat-insulating covering agent and strictly prohibits the use of carbonized rice husks; cleaning the long water gap before pouring the ladle, adding a sealing gasket and sleeving the long water gap, and then pouring, so as to ensure that the argon sealing of the long water gap is normal, controlling the insertion depth of the submerged water gap to be 120mm, and strictly forbidding bias flow; starting up the first round, wherein the liquidus temperature of the ladle temperature is 1518 ℃, and the superheat degree is 50 ℃; using low-carbon steel covering slag; inspecting the casting blank, and carrying out coping treatment on the continuous casting blank with serious surface defects;
step S4, controlled rolling and controlled cooling and wire rod rolling: the initial rolling temperature is 1060 ℃, the finish rolling temperature is 910 ℃, the MINI rolling mill is 930 ℃, the spinning temperature is 880 ℃, and the heat-insulating cover and the fan are all closed to obtain a hot-rolled wire rod;
and S5, inspecting the hot-rolled wire rod, packaging and warehousing.
Example 2
The Zr-containing welding wire steel hot-rolled wire rod comprises the following chemical components in percentage by weight: 0.06% of C, 0.52% of Si, 0.98% of Mn0.98%, 0.012% of P, 0.002% of S, 0.03% of Cr, 0.007% of Ni, 0.011% of Cu, 0.004% of Mo, 0.001% of V, 0.12% of Ti, and Al: 0.09%, Zr: 0.03%, and the balance of Fe and inevitable impurities.
A production process of hot rolled wire rods of Zr-containing welding wire steel comprises the following steps:
step S1, converter smelting deoxidation alloying:
controlling tapping components: c: 0.029%, P: 0.008%, tapping temperature: 1630 deg.C; deoxidizing and alloying during tapping, wherein the sequence and the weight of the added alloy are as follows: 3.2kg/t of aluminum ingot is added for pre-deoxidation after tapping 1/3, and 14kg/t of high silicon manganese silicon and 0.5kg/t of silicon iron are added for alloying; 6.5kg/t of lime and 3kg/t of calcium aluminate slag making materials are added at one time after the steel is tapped 2/3 to form refined primary slag;
step S2, LF refining:
1) replenishing slag making materials after an LF refining furnace enters a station, wherein the slag making materials comprise 6kg/t lime and 1kg/t fluorite, so that the slag has good fluidity and the alkalinity R is 2.0; in the refining process, aluminum beans and ferrosilicon powder are adopted to carry out diffusion deoxidation according to the weight percentage of 1:2, and are added on the slag surface for multiple times in small amount, and the total adding amount is 0.5 kg/t; adjusting the Al content by using an aluminum wire in the early stage, and controlling the target value to be 0.08%;
2) zr alloying: fine adjustment is carried out on components by using high-silicon silicomanganese or medium-carbon ferromanganese and ferrosilicon to ensure that the components in the molten steel reach the standard, wherein C is less than or equal to 0.06%, Si is 0.5%, Mn is 0.95%, S: 0.003 percent of Al and 0.08 percent of Al, after the components are qualified by detection and the temperature reaches 1635 ℃, firstly, 1.0kg/t of ferrozirconium alloy (iron barreled) is added at one time, 4.5m/t of ferrotitanium core-spun yarn is fed at the wire feeding speed of 4m/s, and finally, 2m/t of calcium silicate yarn is fed for calcium treatment; adjusting the flow of argon gas during wire feeding to ensure that molten steel is not exposed; the exit temperature is 1620 ℃; feeding silicon-calcium wires, adding a carbon-free covering agent and carbonized rice hulls, and preserving heat;
3) after LF is out of the station, performing soft argon blowing on the molten steel, wherein the argon flow is 10NL/min, the soft blowing time is more than or equal to 5 minutes, and the ladle is opened for casting after titanium wires are fed and strictly controlled within 20 min;
step S3, casting and producing a casting blank:
1) the method comprises the following steps of pouring by a steel water continuous casting machine, before pouring, argon purging is carried out on a tundish impact area and among various streams, then a steel ladle sliding plate is started to pour, the pouring temperature is 1578 ℃, the target superheat degree is 60 ℃, the pulling speed is controlled at 1.9m/min, the water flow of a crystallizer is 1850L/min, the electromagnetic stirring parameters of the crystallizer are 400A and 4Hz, the electromagnetic stirring parameters at the tail end are 500A and 10Hz, the secondary cooling specific water flow is 0.8L/kg, and the whole pouring process is protected and poured;
2) in the final stage of LF furnace refining, the fine adjustment of the components is qualified, the temperature is 1635 ℃, 1.0kg/t of ferrozirconium alloy (iron barreled) is added at one time, 4.5m/t of ferrotitanium core-spun yarn is fed at the wire feeding speed of 3m/s, the refining is performed deep deoxidation in the early stage, the lower oxygen content is controlled, finally the zirconium content is controlled at 0.03%, the titanium content is controlled at 0.12%, and the yield of zirconium and titanium elements is stabilized;
blowing argon into the tundish before casting, and starting a sliding plate of the ladle for casting after blowing argon for 1-2 minutes; the tundish adopts a stopper rod integral nozzle ladle, uses a tundish heat-insulating covering agent and strictly prohibits the use of carbonized rice husks; cleaning the long water gap before pouring the ladle, adding a sealing gasket and sleeving the long water gap, and then pouring, so as to ensure that the argon sealing of the long water gap is normal, controlling the insertion depth of the submerged water gap to be 80mm, and strictly forbidding bias flow; starting up the first round, wherein the liquidus temperature of the ladle temperature is 1518 ℃, and the superheat degree is 40 ℃; using low-carbon steel covering slag; inspecting the casting blank, and carrying out coping treatment on the continuous casting blank with serious surface defects;
step S4, controlled rolling and controlled cooling and wire rod rolling: the initial rolling temperature is 1000 ℃, the finish rolling temperature is 880 ℃, the MINI rolling mill is 900 ℃, the spinning temperature is 860 ℃, and the heat-insulating cover and the fan are completely closed to obtain a hot-rolled wire rod;
and S5, inspecting the hot-rolled wire rod, packaging and warehousing.
Example 3
The Zr-containing welding wire steel hot-rolled wire rod comprises the following chemical components in percentage by weight: 0.06% of C, 0.55% of Si, 0.97% of Mn0.014% of P, 0.001% of S, 0.04% of Cr, 0.008% of Ni, 0.010% of Cu, 0.004% of Mo, 0.003% of V, 0.08% of Ti, Al: 0.09%, Zr: 0.05%, and the balance of Fe and inevitable impurities.
A production process of hot rolled wire rods of Zr-containing welding wire steel comprises the following steps:
step S1, converter smelting deoxidation alloying:
controlling tapping components: c: 0.033%, P: 0.009%, tapping temperature: 1646 ℃; deoxidizing and alloying during tapping, wherein the sequence and the weight of the added alloy are as follows: after the steel 1/3 is tapped, 4.0kg/t of aluminum ingot is added for pre-deoxidation, and 13.6kg/t of high silicon-manganese-silicon and 0.80kg/t of silicon-iron are added for alloying; 5.5kg/t of lime and 4kg/t of calcium aluminate slag making materials are added at one time after the steel is tapped 2/3 to form refined primary slag;
step S2, LF refining:
1) replenishing slag making materials after an LF refining furnace enters a station, wherein the slag making materials comprise 8kg/t lime and 3kg/t fluorite, so that the slag has good fluidity and the alkalinity R is 5.0; in the refining process, aluminum beans and ferrosilicon powder are adopted to carry out diffusion deoxidation according to the weight percentage of 1:2, and are added on the slag surface for multiple times in small amount, and the total adding amount is 1.0 kg/t; adjusting the Al content by using an aluminum wire in the early stage, and controlling the target value to be 0.13%;
2) zr alloying: fine adjustment is carried out on components by using high-silicon silicomanganese or medium-carbon ferromanganese and ferrosilicon to ensure that the components in the molten steel reach the standard, wherein C is less than or equal to 0.06%, Si is 0.55%, Mn is 1.05%, S: 0.001 percent of Al and 0.13 percent of Al, after the components are qualified and the temperature reaches 1650, firstly adding 1.0kg/t of ferrozirconium alloy (iron barreled) at one time, feeding 5.5m/t of ferrotitanium core-spun yarn at the wire feeding speed of 5m/s, and finally feeding 3m/t of calcium silicate yarn for calcium treatment; adjusting the flow of argon gas during wire feeding to ensure that molten steel is not exposed; the outbound temperature is 1610 ℃; feeding silicon-calcium wires, adding a carbon-free covering agent and carbonized rice hulls, and preserving heat;
3) after LF is out of the station, performing soft argon blowing on the molten steel, wherein the argon flow is 40NL/min, the soft blowing time is more than or equal to 5 minutes, and the ladle is opened for casting after titanium wires are fed and strictly controlled within 20 min;
step S3, casting and producing a casting blank:
1) the method comprises the following steps of pouring by a steel water continuous casting machine, before pouring, argon purging is carried out on a tundish impact area and among various streams, then a steel ladle sliding plate is started to pour, the pouring temperature is 1560 ℃, the target superheat degree is 40 ℃, the pulling speed is controlled at 2.5m/min, the water flow of a crystallizer is 1850L/min, the electromagnetic stirring parameters of the crystallizer are 400A and 4Hz, the electromagnetic stirring parameters at the tail end are 500A and 10Hz, the secondary cooling specific water flow is 1.0L/kg, and the whole pouring process is protected and poured;
2) in the final stage of refining in an LF furnace, after the components are qualified by fine adjustment and the temperature is 1650 ℃ and the components are qualified by detection, firstly, 1.0kg/t of ferrozirconium alloy (iron barreled) is added at one time, 5.0m/t of ferrotitanium cored wire is fed at the wire feeding speed of 4m/s, refining and deep deoxidation are carried out at the early stage of the target, the lower oxygen content is controlled, finally, the zirconium content is controlled at 0.05 percent, the titanium content is controlled at 0.08 percent, and the yield of zirconium and titanium elements is stabilized;
blowing argon into the tundish before casting, and starting a sliding plate of the ladle for casting after blowing argon for 1-2 minutes; the tundish adopts a stopper rod integral nozzle ladle, uses a tundish heat-insulating covering agent and strictly prohibits the use of carbonized rice husks; cleaning the long water gap before pouring the ladle, adding a sealing gasket and sleeving the long water gap, and then pouring, so as to ensure that the argon sealing of the long water gap is normal, controlling the insertion depth of the submerged water gap to be 140mm, and strictly forbidding bias flow; starting up the first round, wherein the liquidus temperature of the ladle temperature is 1518 ℃, and the superheat degree is 60 ℃; using low-carbon steel covering slag; inspecting the casting blank, and carrying out coping treatment on the continuous casting blank with serious surface defects;
step S4, controlled rolling and controlled cooling and wire rod rolling: the initial rolling temperature is 1030 ℃, the finish rolling temperature is 920 ℃, the MINI rolling mill is 940 ℃, the spinning temperature is 900 ℃, and the heat-insulating cover and the fan are all closed to obtain a hot-rolled wire rod;
and S5, inspecting the hot-rolled wire rod, packaging and warehousing.
The Zr-Ti-Al alloying sequence, the adding mode and the adding time of the zirconium are reasonably arranged, so that the Zr-Ti-Al elements are uniformly distributed in the steel, the problem of secondary oxidation of the Zr-Ti-Al elements in the steel is solved, the problem of water gap nodulation in the pouring process is solved, and the surface quality of the continuous casting billet is improved.
FIG. 1 is a graph showing the results of comparison of the tensile strength and reduction of area of samples of hot rolled wire rods of Zr-containing wire steels obtained in examples 1 and 3; wherein the numbers of X4190204400101, X4190204400102, X4190319500101 and X4190319500102 are the numbers of the Zr-containing welding wire steel hot-rolled wire rod rolling test piece obtained in the example 1, the numbers of X4190204400101, X4190204400102, X4190319500101 and X4190319500102 are the numbers of the Zr-containing welding wire steel hot-rolled wire rod rolling test piece obtained in the example 3, and the mechanical properties of the wire rod produced by the method can be seen from figure 1 to meet the requirements that the tensile strength is less than or equal to 600MPa and the reduction of area is more than or equal to 60 percent.
As shown in table 1, the low-magnification test results of the billets of examples 1 and 3 are shown, wherein the low-magnification test results of the billets of the wire rods containing Zr prepared in example 1 are shown in samples 1, 2 and 3, and the low-magnification test results of the billets of the wire rods containing Zr prepared in example 3 are shown in samples 4, 5, 6 and 7.
Figure BDA0002879905090000081
As shown in FIG. 2, FIG. 2(a) is a low-magnification photograph of pickling a Zr-containing wire steel casting blank obtained in example 1, and FIG. 2(b) is a low-magnification photograph of pickling a Zr-containing wire steel casting blank obtained in example 3, it can be seen that the pickled surface of the casting blank is good, and the low-magnification quality of the casting blank meets the product requirements.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (9)

1. The hot-rolled wire rod of the Zr-containing welding wire steel is characterized by comprising the following chemical components in percentage by weight: c is less than or equal to 0.06%, Si: 0.45-0.55%, Mn: 0.95-1.05%, P is less than or equal to 0.020%, S: less than or equal to 0.018%, Cr: less than or equal to 0.10 percent, Ni: less than or equal to 0.10 percent, Cu: less than or equal to 0.20, Mo: 0.10 or less, V: less than or equal to 0.02, Ti: 0.07 to 0.13%, Al: 0.06-0.12%, Zr: 0.03-0.09%, and the balance of Fe and inevitable impurities;
the hot-rolled wire rod of the Zr-containing welding wire steel is produced according to the following process, and comprises the following steps:
step S1, converter smelting deoxidation alloying:
controlling tapping components: c is less than or equal to 0.03 percent, P is less than or equal to 0.010 percent, and the tapping temperature is more than or equal to 1620 ℃; deoxidizing and alloying during tapping, wherein the sequence and the weight of the added alloy are as follows: 3.2-4.0kg/t of aluminum ingot is added for pre-deoxidation after tapping 1/3, and 13-14kg/t of high silicon manganese silicon and 0.5-1.0kg/t of silicon iron are added for alloying; 5.5-6.5kg/t lime and 3-4kg/t calcium aluminate slag making material are added at one time after the steel is tapped 2/3 to form refined primary slag;
step S2, LF refining:
1) replenishing slag making materials after an LF refining furnace enters a station, wherein the components of the slag making materials are 4-8kg/t lime and 0-3kg/t fluorite, so that the slag has good fluidity and the alkalinity R is 2.0-5.0; in the refining process, aluminum beans and ferrosilicon powder are adopted to carry out diffusion deoxidation according to the weight percentage of 1:2, and are added on the slag surface for multiple times in small amount, and the total adding amount is 0.5-1.0 kg/t; adjusting Al content with aluminum wire at early stage, and controlling target value at 0.08-0.13%;
2) zr alloying: fine adjustment is carried out on components by using high-silicon manganese, medium-carbon ferromanganese and ferrosilicon to ensure that the components in the molten steel reach the standard, wherein C is less than or equal to 0.06%, Si is 0.45-0.55%, Mn is 0.95-1.05%, S is less than or equal to 0.003% and Al is 0.08-0.13%, after the components are qualified in detection and the temperature reaches 1620-1650 ℃, 1.0kg/t of ferrozirconium alloy is added at one time, 4.5-5.5m/t of ferrotitanium core-spun yarn is fed at a yarn feeding speed of 3-5m/S, and finally, calcium silicate yarn is fed for calcium treatment at 2-3 m/t; adjusting the flow of argon gas during wire feeding to ensure that molten steel is not exposed; the exit temperature is 1600-1620 ℃;
3) after LF is out of the station, soft argon blowing is carried out on the molten steel, the argon flow is 10-40NL/min, the soft blowing time is more than or equal to 5 minutes, and ladle casting is carried out after titanium wires are fed and strictly controlled within 20 min;
step S3, casting and producing a casting blank:
1) the method comprises the following steps of pouring by using an upper steel continuous casting machine, starting a steel ladle sliding plate to open and pour after argon purging is carried out on an impact area of a tundish and among various streams before the opening and pouring, wherein the opening and pouring temperature is 1558-1578 ℃, the target superheat degree is 40-60 ℃, the pulling speed is controlled to be 1.9-2.5 m/min, the water flow of a crystallizer is 1850L/min, the electromagnetic stirring parameters of the crystallizer are 400A and 4Hz, the electromagnetic stirring parameters at the tail end are 500A and 10Hz, the secondary cooling specific water flow is 0.8-1.0L/kg, and the whole process of pouring is protected and poured;
2) in the last stage of refining in an LF furnace, after the components are qualified by fine adjustment and the temperature reaches 1620-1650 ℃, firstly adding 1.0kg/t of ferrozirconium alloy at one time, then feeding 4.5-5.5m/t of ferrotitanium cored wires at the wire feeding speed of 3-5m/s, finally controlling the zirconium content at 0.03-0.06% and the titanium content at 0.08-0.12%, and stabilizing the yield of zirconium and titanium elements;
step S4, controlled rolling and controlled cooling and wire rod rolling are carried out to obtain a hot-rolled wire rod;
and S5, inspecting the hot-rolled wire rod, packaging and warehousing.
2. The hot rolled wire rod of Zr-containing wire steel according to claim 1, characterized by that its chemical composition in weight percent is: 0.06% of C, 0.52% of Si, 0.99% of Mn0.010% of P, 0.001% of S, 0.03% of Cr, 0.010% of Ni, 0.013% of Cu, 0.004% of Mo, 0.004% of V, 0.10% of Ti, 0.07% of Al, 0.06% of Zr0.06% and the balance of Fe and inevitable impurities.
3. The hot rolled wire rod of Zr-containing wire steel according to claim 1, characterized by that its chemical composition in weight percent is: 0.06% of C, 0.52% of Si, 0.98% of Mn0.98%, 0.012% of P, 0.002% of S, 0.03% of Cr, 0.007% of Ni, 0.011% of Cu, 0.004% of Mo, 0.001% of V, 0.12% of Ti, and Al: 0.09%, Zr: 0.03%, and the balance of Fe and inevitable impurities.
4. The hot rolled wire rod of Zr-containing wire steel according to claim 1, characterized by that its chemical composition in weight percent is: 0.06% of C, 0.55% of Si, 0.97% of Mn0.014% of P, 0.001% of S, 0.04% of Cr, 0.008% of Ni, 0.010% of Cu, 0.004% of Mo, 0.003% of V, 0.08% of Ti, Al: 0.09%, Zr: 0.05%, and the balance of Fe and inevitable impurities.
5. The Zr-containing wire-welded steel hot-rolled wire rod according to claim 1, wherein the feeding speed of the ferrotitanium cored wire in the step S2 is 3-5 m/S.
6. The Zr-containing wire rod according to claim 1, wherein said step S2 is performed by adding non-carbon covering agent + carbonized rice husk for heat preservation after feeding silicon-calcium wire.
7. The Zr-containing wire rod according to claim 1, wherein said step S3 is performed using a stopper rod integral nozzle ladle using low carbon steel mold flux.
8. The hot-rolled wire rod of the Zr-containing wire rod steel as claimed in claim 7, wherein the tundish is subjected to argon blowing operation before the start of the argon blowing in step S3, and the sliding plate of the ladle is started to start casting after the argon blowing operation is carried out for 1-2 minutes; the tundish adopts a stopper rod integral nozzle ladle, uses a tundish heat-insulating covering agent and strictly prohibits the use of carbonized rice husks; cleaning the long water gap before pouring the ladle, adding a sealing gasket, sleeving the long water gap, and then pouring, so as to ensure that the argon sealing of the long water gap is normal, controlling the insertion depth of the submerged water gap to be 80-140 mm, and strictly forbidding bias flow; starting up a first round of tundish, wherein the liquidus temperature of the tundish temperature is 1518 ℃, and the superheat degree is 40-60 ℃; using low-carbon steel covering slag; and inspecting the casting blank, and carrying out coping treatment on the continuous casting blank with serious surface defects.
9. The Zr wire containing steel hot rolled wire rod according to claim 1, wherein in said step S4: the initial rolling temperature is 1000-1060 ℃, the finish rolling temperature is 880-920 ℃, the rolling mill is 900-940 ℃, the spinning temperature is 860-900 ℃, and the heat-preserving cover and the fan are all closed.
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