WO2022143363A1 - 一种含Zr焊丝钢热轧盘条及其生产工艺 - Google Patents

一种含Zr焊丝钢热轧盘条及其生产工艺 Download PDF

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WO2022143363A1
WO2022143363A1 PCT/CN2021/140663 CN2021140663W WO2022143363A1 WO 2022143363 A1 WO2022143363 A1 WO 2022143363A1 CN 2021140663 W CN2021140663 W CN 2021140663W WO 2022143363 A1 WO2022143363 A1 WO 2022143363A1
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wire
steel
hot
wire rod
slag
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PCT/CN2021/140663
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French (fr)
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郭峰
刘一龙
李超
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苏州骐骥焊接材料有限公司
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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

Definitions

  • the invention relates to the field of welding wire and metallurgy technology, in particular to a hot-rolled wire rod of Zr-containing welding wire steel and a production process thereof.
  • the wire rod is used to produce ⁇ 0.8- ⁇ 2.0mm gas shielded solid welding wire. It has excellent welding process performance, can be welded in all positions, and the weld is beautifully formed. It has excellent crack resistance and high low temperature impact toughness. Mainly used for pipelines and nuclear power projects, such as single-pass or multi-pass welding of carbon steel and low-alloy steel with a strength of 450 or 500MPa.
  • Deoxidizing elements such as Al, Ti, Zr are added to the steel, which has a high resistance to rust or dirt on the surface of the steel, and can also be used for rescue welding of boilers and pipes.
  • Zr is similar to Ti and Al elements, and it is easy to react with nitrogen and oxygen, and the corresponding inclusions have a high melting point (ZrO 2 has a melting point of 2700 ° C), and its inclusions will block the nozzle.
  • Al, Ti, Zr, etc. are added to the steel at the same time. Alloying elements, the fluidity of molten steel is poor, and it is difficult to control the production of steelmaking and continuous casting, especially the casting production of billets is extremely difficult.
  • the present invention provides a Zr-containing welding wire steel hot-rolled wire rod and a production process thereof.
  • a reasonable LF slag-making and deoxidizing process a zirconium-iron alloy addition method and timing, etc.
  • the Zr content in the molten steel can be controlled to meet the standard requirements.
  • tundish slag, protective casting measures and other means the nodulation phenomenon of molten steel during the casting process is avoided, and the normal casting of molten steel is ensured.
  • the invention solves the problem of Zr alloying and continuous casting billet casting process control in the production process of welding wire steel.
  • a Zr-containing welding wire steel hot-rolled wire rod the chemical composition of which is calculated by weight percentage as follows: C ⁇ 0.06%, Si: 0.45-0.55%, Mn: 0.95-1.05%, P ⁇ 0.020%, S: ⁇ 0.018%, Cr: ⁇ 0.10%, Ni: ⁇ 0.10%, Cu: ⁇ 0.20, Mo: ⁇ 0.10, V: ⁇ 0.02, Ti: 0.07 ⁇ 0.13%, Al: 0.06 ⁇ 0.12%, Zr: 0.03 ⁇ 0.09%, balance For Fe and inevitable impurities.
  • its chemical composition is calculated by weight percentage: C0.06%, Si0.52%, Mn0.99%, P0.010%, S 0.001%, Cr 0.03%, Ni 0.010%, Cu 0.013, Mo 0.004, V 0.004, Ti 0.10, Al 0.07%, Zr 0.06%, and the balance is Fe and inevitable impurities.
  • its chemical composition is calculated by weight percentage: C0.06%, Si 0.52%, Mn0.98%, P 0.012%, S 0.002%, Cr 0.03%, Ni 0.007%, Cu 0.011, Mo 0.004, V 0.001 , Ti 0.12%, Al: 0.09%, Zr: 0.03%, and the balance is Fe and inevitable impurities.
  • its chemical composition is calculated by weight percentage: C0.06%, Si 0.55%, Mn0.97%, P 0.014%, S 0.001%, Cr 0.04%, Ni 0.008%, Cu 0.010, Mo 0.004, V 0.003 , Ti 0.08%, Al: 0.09%, Zr: 0.05%, the balance is Fe and inevitable impurities, and the balance is Fe and inevitable impurities.
  • a production process of Zr-containing welding wire steel hot-rolled wire rod comprising the following steps:
  • Step S1 converter smelting and deoxidizing alloying: control requirements for tapping components: C ⁇ 0.03%, P ⁇ 0.010%, and tapping temperature ⁇ 1620°C; deoxidizing alloying is performed during tapping, and the sequence and weight of adding alloys are: tapping After 1/3, add 3.2-4.0kg/t aluminum ingot for pre-deoxidation, and add 13-14kg/t high silicon silicon manganese and 0.5-1.0kg/t ferrosilicon for alloying; tapping after 2/3 Add 5.5-6.5kg/t lime and 3-4kg/t calcium aluminate slag making material to form refining primary slag;
  • Step S2 LF refining:
  • the LF refining furnace After the LF refining furnace enters the station, add slag-forming materials, and the components of the slag-forming materials are lime 4-8kg/t, 0-3kg/t fluorite, so that the slag has good fluidity and basicity R is 2.0-5.0; in the refining process, the weight percentage of aluminum beans and ferrosilicon powder is 1:2 for diffusion and deoxidation, and it is added to the slag surface in small amounts and multiple times, and the total addition amount is 0.5-1.0kg/t; in the early stage, aluminum was used. The Al content is adjusted on the line, and the target value is controlled at 0.08-0.13%;
  • Zr alloying use high silicon silicon manganese or medium carbon ferromanganese and ferrosilicon to fine-tune the composition to make the composition of molten steel meet the standard, of which C ⁇ 0.06%, Si: 0.45 ⁇ 0.55%, Mn: 0.95 ⁇ 1.05%, S ⁇ 0.003%, Al: 0.08 ⁇ 0.13%, the composition is qualified and the temperature reaches 1620 ⁇ 1650, first add 1.0kg/t zirconium-iron alloy (iron barrel) at one time, and feed at the wire feeding speed of 3-5m/s 4.5-5.5m/t titanium-iron cored wire, and finally feed 2-3m/t silicon calcium wire for calcium treatment; adjust the argon flow during wire feeding to ensure that the molten steel is not exposed; the exit temperature is 1600-1620°C;
  • Step S3 casting and producing a billet:
  • Step S4 controlled rolling and controlled cooling and wire rod rolling to obtain a hot-rolled wire rod
  • step S5 the hot-rolled wire rod is inspected, packaged and put into storage.
  • the wire feeding speed of the titanium-iron cored wire in the step S2 is 3-5 m/s.
  • the carbon-free covering agent + carbonized rice husks are added after the silicon-calcium wire is fed to keep warm.
  • the step S3 adopts the stopper rod integral nozzle ladle and the low carbon steel mold slag.
  • the tundish is subjected to argon blowing operation before the pouring starts, and the ladle slide plate is started after 1-2 minutes of argon blowing; the tundish adopts the stopper rod integral nozzle ladle, and the tundish thermal insulation covering agent is used, and the use of carbonization is strictly prohibited.
  • Rice husk clean the long nozzle before pouring the large bag, add a sealing gasket, cover the long nozzle, and then start pouring to ensure that the long nozzle is properly sealed with argon.
  • the liquidus temperature of the middle bag is 1518°C, and the superheat degree is 40 ⁇ 60°C; low carbon steel mold slag is used. During the pouring process, add frequently, less, and evenly. Depending on the situation, a slag picking ring is required to keep the liquid level of the mold stable. ; Check the casting billet, and carry out grinding treatment for the continuous casting billet with serious surface defects.
  • the starting rolling temperature is 1000-1060°C
  • the finishing rolling is 880-920°C
  • the MINI rolling mill is 900-940°C
  • the spinning temperature is 860-900°C
  • the insulation cover and the fan are all turned off.
  • the invention improves the yield of Zr element, deeply deoxidizes, reduces the formation of high melting point inclusions such as ZrO2, improves removal effect and reduces nodule; the production process of the invention controls the chemical composition of the product and stabilizes the mechanical properties.
  • the method controls the carbon content at the end of the converter, and it is strictly forbidden to use calcium carbide and silicon carbide for deoxidation in the refining process. Water carbonizes.
  • appropriate amount of aluminum wire is selected for deoxidation and alloying, ferrosilicon powder and aluminum beans are diffused and deoxidized to form white slag, calcium carbide and silicon carbide are strictly prohibited, and the white slag time is more than 10 minutes, which further reduces the [S] and gas content in the steel.
  • the Zr alloying method of the present invention ensures that the wire feeding speed is 3-5m/s; in the final stage of refining, when the content of C, Si, Mn, P, S, and Al meets the target range, FeZr80, a zirconium-iron alloy, is added at one time, and then the titanium-iron ladle is fed at one time.
  • the core wire FeTi70 refers to the feeding amount of 4.5-5.5m/t to improve the yield of Ti and Zr. Adjust the argon flow during the feeding period to ensure that the molten steel is not exposed.
  • the invention appropriately increases the amount of refining slag, adjusts the flow rate and time of soft blowing after Zr alloying, ensures the uniformity of Al, Ti and Zr elements in the steel, and reduces the secondary oxidation of the elements.
  • the present invention appropriately increases the pouring temperature to alleviate the molten steel nodule problem.
  • the invention formulates reasonable blank heating and wire rod rolling processes to ensure product quality.
  • FIG. 1 is a comparison chart of the tensile strength and the reduction in area of the specific embodiment of the present invention.
  • Fig. 2 is a low-magnification photo of pickling of Zr-containing welding wire steel casting billet according to a specific embodiment of the present invention, wherein Fig. 2(a) is a low-magnification photo of pickling of Zr-containing welding wire steel casting billet obtained in Example 1, Fig. 2(b) ) is a low magnification photo of the Zr-containing welding wire steel casting billet obtained in Example 3 by pickling.
  • a Zr-containing welding wire steel hot-rolled wire rod the chemical composition of the Zr-containing welding wire steel hot-rolled wire rod is calculated by weight percentage: C0.06%, Si0.52%, Mn0.99%, P0.010%, S 0.001%, Cr 0.03%, Ni 0.010%, Cu 0.013, Mo 0.004, V 0.004, Ti 0.10, Al0.07%, Zr0.06%, the balance is Fe and inevitable impurities.
  • a production process of Zr-containing welding wire steel hot-rolled wire rod comprising the following steps:
  • Step S1 converter smelting deoxidation alloying
  • Control requirements for tapping composition C: 0.023%, P: 0.007%, tapping temperature: 1620°C; deoxidation alloying is performed during tapping, and the order and weight of adding alloys are: add 3.4kg/t after tapping 1/3
  • the aluminum ingot is pre-deoxidized, and 13kg/t high-silicon manganese and 1.0kg/t ferrosilicon are added for alloying; 6.0kg/t lime and 3.5kg/t aluminum are added at one time after tapping 2/3.
  • Calcium acid slag making material to form refining primary slag;
  • Step S2 LF refining:
  • slag-forming materials After the LF refining furnace enters the station, add slag-forming materials.
  • the components of the slag-forming materials are lime 4kg/t and 0kg/t fluorite, so that the slag has good fluidity and basicity R is 3.0; refining process Use aluminum beans and ferrosilicon powder to carry out diffusion deoxidation according to the weight percentage of 1:2, add them on the slag surface in small amounts and several times, and the total addition amount is 0.8kg/t; in the early stage, the Al content was adjusted with aluminum wire, and the target value was controlled at 0.10%;
  • Zr alloying use high silicon silicon manganese or medium carbon ferromanganese and ferrosilicon to fine-tune the composition to make the composition of molten steel meet the standard, among which C ⁇ 0.06%, Si: 0.45%, Mn: 1.01%, S: 0.002%, Al: 0.12%, after the composition test is qualified and the temperature reaches 1620, 1.0kg/t zirconium-iron alloy (iron barrel) is added at one time, and 5m/t titanium-iron cored wire is fed at a wire feeding speed of 3m/s.
  • the feeding speed of the iron-titanium cored wire is 5m/s, and finally 2.5m/t of calcium-silicon wire is fed for calcium treatment; the flow of argon gas is adjusted during feeding to ensure that the molten steel is not exposed; the exit temperature is 1600°C; the calcium-silicon wire is fed After silk, add carbon-free covering agent + carbonized rice husk to keep warm;
  • Step S3 casting and producing a billet:
  • the tundish Before pouring, the tundish shall be blown with argon, and the ladle slide shall be started after 1-2 minutes of argon blowing; the tundish shall use the stopper-rod integral nozzle ladle, and the tundish thermal insulation covering agent shall be used, and the use of carbonized rice husks is strictly prohibited; Clean the long nozzle, add a gasket, cover the long nozzle, and then start pouring to ensure that the long nozzle is properly sealed with argon. , the superheat degree is 50 °C; use low carbon steel mold slag; check the casting billet, and carry out grinding treatment on the continuous casting billet with serious surface defects;
  • Step S4 controlled rolling and controlled cooling and wire rod rolling: the opening rolling temperature is 1060°C, the finishing rolling is 910°C, the MINI rolling mill is 930°C, the spinning temperature is 880°C, the heat preservation cover and the fan are all turned off, and the hot-rolled wire rod is obtained;
  • step S5 the hot-rolled wire rod is inspected, packaged and put into storage.
  • a Zr-containing welding wire steel hot-rolled wire rod the chemical composition of the Zr-containing welding wire steel hot-rolled wire rod is calculated by weight percentage: C0.06%, Si 0.52%, Mn0.98%, P 0.012%, S 0.002% , Cr 0.03%, Ni 0.007%, Cu 0.011, Mo 0.004, V 0.001, Ti 0.12%, Al: 0.09%, Zr: 0.03%, the balance is Fe and inevitable impurities.
  • a production process of Zr-containing welding wire steel hot-rolled wire rod comprising the following steps:
  • Step S1 converter smelting deoxidation alloying
  • Control requirements for tapping composition C: 0.029%, P: 0.008%, tapping temperature: 1630°C; deoxidation alloying is carried out during tapping, and the order and weight of adding alloys are: 1/3 after tapping, add 3.2kg/t
  • the aluminum ingot is pre-deoxidized, and 14kg/t high-silicon manganese and 0.5kg/t ferrosilicon are added for alloying; 6.5kg/t lime and 3kg/t aluminate are added at one time after tapping 2/3.
  • Calcium slag making material to form refining primary slag;
  • Step S2 LF refining:
  • Zr alloying Use high silicon silicon manganese or medium carbon ferromanganese and ferrosilicon to fine-tune the composition to make the composition of molten steel meet the standard, among which C ⁇ 0.06%, Si: 0.5%, Mn: 0.95%, S: 0.003%, Al: 0.08%, after the composition test is qualified and the temperature reaches 1635 °C, first add 1.0kg/t zirconium-iron alloy (in iron drum) at one time, and feed 4.5m/t titanium-iron core cladding at a wire feeding speed of 4m/s wire, and finally feed 2m/t calcium calcium wire for calcium treatment; adjust the argon flow during wire feeding to ensure that the molten steel is not exposed; the exit temperature is 1620°C; after feeding the silicon calcium wire, add carbon-free covering agent + carbonized rice husk for heat preservation ;
  • Step S3 casting and producing a billet:
  • the tundish Before pouring, the tundish shall be blown with argon, and the ladle slide shall be started after 1-2 minutes of argon blowing; the tundish shall use the stopper-rod integral nozzle ladle, and the tundish thermal insulation covering agent shall be used, and the use of carbonized rice husks is strictly prohibited; Clean the long nozzle, add a gasket, cover the long nozzle, and then start pouring to ensure that the long nozzle is properly argon-sealed, the insertion depth of the submerged nozzle is controlled within 80mm, and bias flow is strictly prohibited; , the superheat degree is 40 °C; use low-carbon steel mold slag; check the casting billet, and carry out grinding treatment on the continuous casting billet with serious surface defects;
  • Step S4 controlled rolling and controlled cooling and wire rod rolling: the opening rolling temperature is 1000°C, the finishing rolling is 880°C, the MINI rolling mill is 900°C, the spinning temperature is 860°C, the heat preservation cover and the fan are all turned off, and the hot-rolled wire rod is obtained;
  • step S5 the hot-rolled wire rod is inspected, packaged and put into storage.
  • a Zr-containing welding wire steel hot-rolled wire rod the chemical composition of the Zr-containing welding wire steel hot-rolled wire rod is calculated by weight percentage: C0.06%, Si 0.55%, Mn0.97%, P 0.014%, S 0.001% , Cr 0.04%, Ni 0.008%, Cu 0.010, Mo 0.004, V 0.003, Ti 0.08%, Al: 0.09%, Zr: 0.05%, and the balance is Fe and inevitable impurities.
  • a production process of Zr-containing welding wire steel hot-rolled wire rod comprising the following steps:
  • Step S1 converter smelting deoxidation alloying
  • Control requirements for tapping composition C: 0.033%, P: 0.009%, tapping temperature: 1646 °C; deoxidation alloying is carried out during tapping, and the order and weight of adding alloys are: 1/3 after tapping, add 4.0kg/t
  • the aluminum ingot is pre-deoxidized, and 13.6kg/t high-silicon manganese and 0.80kg/t ferrosilicon are added for alloying; after 2/3 of the steel is tapped, 5.5kg/t lime and 4kg/t aluminum are added at one time.
  • Calcium acid slag making material to form refining primary slag;
  • Step S2 LF refining:
  • slag-forming materials the components of which are lime 8kg/t, 3kg/t fluorite, so that the slag has good fluidity and basicity R is 5.0; refining process
  • the aluminum beans and ferrosilicon powder are used for diffusion deoxidation according to the weight percentage of 1:2, and they are added to the slag surface in small amounts and multiple times, and the total addition amount is 1.0kg/t; in the early stage, the Al content was adjusted with aluminum wire, and the target value was controlled. at 0.13%;
  • Zr alloying use high silicon silicon manganese or medium carbon ferromanganese and ferrosilicon to fine-tune the composition to make the composition of molten steel meet the standard, among which C ⁇ 0.06%, Si: 0.55%, Mn: 1.05%, S: 0.001%, Al: 0.13%, after the composition test is qualified and the temperature reaches 1650, 1.0kg/t zirconium-iron alloy (in iron barrels) is added at one time, and 5.5m/t titanium-iron cored wire is fed at a wire feeding speed of 5m/s , and finally feed 3m/t of calcium-silicon wire for calcium treatment; adjust the argon flow during feeding to ensure that the molten steel is not exposed; the exit temperature is 1610 °C; after feeding the silicon-calcium wire, add carbon-free covering agent + carbonized rice husk to keep warm;
  • Step S3 casting and producing a billet:
  • the temperature is 1650°C, and the component testing is qualified, first add 1.0kg/t zirconium-iron alloy (in iron barrels) at one time, and feed 5.0m at a wire feeding speed of 4m/s /t Titanium-iron cored wire, the target is refined and deeply deoxidized in the early stage, and the oxygen content is controlled to a lower level. Finally, the zirconium content is controlled at 0.05%, and the titanium content is controlled at 0.08%, which stabilizes the yield of zirconium and titanium elements;
  • the tundish Before pouring, the tundish shall be blown with argon, and the ladle slide shall be started after 1-2 minutes of argon blowing; the tundish shall use the stopper-rod integral nozzle ladle, and the tundish thermal insulation covering agent shall be used, and the use of carbonized rice husks is strictly prohibited; Clean the long nozzle, add a gasket, cover the long nozzle, and then start pouring to ensure that the long nozzle is properly sealed with argon, and the insertion depth of the submerged nozzle is controlled within 140mm, and bias flow is strictly prohibited; , the superheat degree is 60 °C; use low-carbon steel mold slag; check the casting billet, and carry out grinding treatment on the continuous casting billet with serious surface defects;
  • Step S4 controlled rolling, controlled cooling and wire rod rolling: the opening rolling temperature is 1030°C, the finishing rolling is 920°C, the MINI rolling mill is 940°C, the spinning temperature is 900°C, the heat preservation cover and the fan are all turned off, and the hot-rolled wire rod is obtained;
  • step S5 the hot-rolled wire rod is inspected, packaged and put into storage.
  • the invention solves the problem of secondary oxidation of Zr-Ti-Al elements in steel by rationally arranging Zr-Ti-Al alloying sequence, adding method and timing of zirconium, so as to make Zr-Ti-Al elements evenly distributed in steel , Solve the problem of nodules at the nozzle during the pouring process and improve the surface quality of the continuous casting billet.
  • FIG. 1 it is a comparison chart of the tensile degree and area shrinkage rate of the samples of Zr-containing wire steel hot-rolled wire rod obtained in Example 1 and Example 3; the numbers X4190204400101, X4190204400102, X4190319500101, and X41 90319500102 are implemented
  • the Zr-containing welding wire steel hot-rolled wire rod rolling test piece numbers obtained in Example 1 numbered X4190204400101, X4190204400102, X4190319500101, X4190319500102, are the Zr-containing welding wire steel hot-rolling wire rod rolling test piece numbers obtained in Example 3, It can be seen from Fig. 1 that the mechanical properties of the wire rod produced by the present invention meet the requirements of "tensile strength ⁇ 600MPa, section shrinkage rate ⁇ 60%".
  • Example 1 As shown in Table 1, the low magnification inspection results of the steel billets in Example 1 and Example 3 are shown, in which samples 1, 2, and 3 are the low magnification inspection results of the Zr-containing welding wire steel billets prepared in Example 1. Samples 4, 5, and 6 And 7 is the low magnification test result of the Zr-containing welding wire steel billet prepared in Example 3, it can be seen that the low magnification of the billet is better, and the indicators such as center porosity and segregation meet the requirements.
  • Figure 2(a) is a low magnification photo of the pickling of the Zr-containing welding wire steel billet prepared in Example 1
  • Figure 2(b) is the pickling of the Zr-containing welding wire steel billet prepared in Example 3.
  • the low magnification photo shows that the pickling surface of the billet is good, and the low magnification quality of the continuous casting billet meets the product requirements.

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Abstract

本发明提供一种含Zr焊丝钢热轧盘条及其生产工艺，其化学成分按照重量百分比计算为：C≤0.06％，Si：0.45～0.55％，Mn：0.95～1.05％，P≤0.020％，S：≤0.018％，Cr：≤0.10％，Ni：≤0.10％，Cu：≤0.20，Mo：≤0.10，V：≤0.02，Ti：0.07～0.13％，Al：0.06～0.12％，Zr：0.03～0.09％，余量为Fe和不可避免的杂质。通过采用合理的LF造渣脱氧工艺、锆铁合金加入方式及时机等手段保证控制钢水中Zr含量满足标准要求。通过采用合理的连铸工艺参数、中间包保护渣、保护浇铸措施等手段避免了钢水在浇铸过程出现结瘤现象，保证了钢水正常浇铸。本发明解决了焊丝钢生产过程中Zr合金化及连铸小方坯浇注工艺控制问题。

Description

一种含Zr焊丝钢热轧盘条及其生产工艺 技术领域
本发明涉及焊丝以及冶金技术领域，具体涉及一种含Zr焊丝钢热轧盘条及其生产工艺。
背景技术
该盘条用于生产Φ0.8-Φ2.0mm气体保护实心焊丝，具有优良的焊接工艺性能，可进行全位置焊接、焊缝成形美观，具有优良的抗裂性能，较高的低温冲击韧性。主要用于管道、核电工程，如450或500MPa级强度的碳钢及低合金钢的单道或多道焊接。
钢中添加Al、Ti、Zr等脱氧元素，对钢材表面锈迹或脏污耐受能力较高，也可用于锅炉、管道的抢救焊接。但是Zr与Ti、Al元素类似，极易与氮、氧反应，相应夹杂物熔点较高(ZrO 2熔点达2700℃)，其夹杂物会堵塞水口，在钢中同时添加Al、Ti、Zr等合金元素，其钢水流动性较差，炼钢及连铸生产控制困难，尤其是小方坯浇注生产难度极大，目前国内太钢、东北特钢生产模铸钢锭“二火材”，而我司采用连铸“一火材”，生产成本优势显著。因此，研究该钢种的冶炼和浇注生产工艺至关重要，主要包括转炉出钢脱氧合金化工艺，LF精炼脱氧造渣工艺，Zr合金化工艺及连铸小方坯生产工艺问题。
发明内容
针对上述技术问题，本发明提供一种含Zr焊丝钢热轧盘条及其生产工艺，通过采用合理的LF造渣脱氧工艺、锆铁合金加入方式及时机等手段保证控制钢水中Zr含量满足标准要求。通过采用合理的连铸工艺参数、中间包保护渣、保护浇铸措施等手段避免了钢水在浇铸过程出现结瘤现象，保证了钢水正常浇铸。本发明解决了焊丝钢生产过程中Zr合金化及连铸小方坯浇注工艺控制问题。
一种含Zr焊丝钢热轧盘条，其化学成分按照重量百分比计算为：C≤0.06％，Si：0.45～0.55％，Mn：0.95～1.05％，P≤0.020％，S：≤0.018％，Cr：≤0.10％，Ni：≤0.10％，Cu：≤0.20，Mo：≤0.10，V：≤0.02，Ti：0.07～0.13％，Al：0.06～0.12％，Zr：0.03～0.09％，余量为Fe和不可避免的杂质。
优选的，其化学成分按照重量百分比计算为：C0.06％，Si0.52％，Mn0.99％，P0.010％，S 0.001％，Cr 0.03％，Ni 0.010％，Cu 0.013，Mo 0.004，V 0.004，Ti 0.10，Al0.07％，Zr0.06％，余量为Fe和不可避免的杂质。
优选的，其化学成分按照重量百分比计算为：C0.06％，Si 0.52％，Mn0.98％，P 0.012％， S 0.002％，Cr 0.03％，Ni 0.007％，Cu 0.011，Mo 0.004，V 0.001，Ti 0.12％，Al：0.09％，Zr：0.03％，余量为Fe和不可避免的杂质。
优选的，其化学成分按照重量百分比计算为：C0.06％，Si 0.55％，Mn0.97％，P 0.014％，S 0.001％，Cr 0.04％，Ni 0.008％，Cu 0.010，Mo 0.004，V 0.003，Ti 0.08％，Al：0.09％，Zr：0.05％，余量为Fe和不可避免的杂质，余量为Fe和不可避免的杂质。
一种含Zr焊丝钢热轧盘条的生产工艺，包括以下步骤：
步骤S1、转炉冶炼脱氧合金化：出钢成分控制要求：C≤0.03％，P≤0.010％，出钢温度≥1620℃；出钢时进行脱氧合金化，加入合金的顺序及重量为：出钢1/3后加入3.2-4.0kg/t的铝锭预脱氧，并加入13-14kg/t的高硅硅锰和0.5-1.0kg/t的硅铁进行合金化；出钢2/3后一次性加入5.5-6.5kg/t的石灰和3-4kg/t的铝酸钙造渣料，形成精炼初渣；
步骤S2、LF精炼：
1)LF精炼炉进站之后补加造渣料，所述造渣料的组分为石灰4-8kg/t、0-3kg/t萤石，使炉渣具有良好的流动性以及碱度R为2.0-5.0；精炼过程采用铝豆和硅铁粉重量百分比为按照1:2进行扩散脱氧，将其分少量多次加在渣面上，总加入量为0.5-1.0kg/t；前期用铝线调整Al含量，目标值控制在0.08-0.13％；
2)Zr合金化：使用高硅硅锰或中碳锰铁、硅铁进行成分微调，使钢水中成分达标，其中C≤0.06％、Si:0.45～0.55％、Mn:0.95～1.05％、S≤0.003％、Al:0.08～0.13％，成分合格以及温度达到1620～1650后，先一次性加入1.0kg/t的锆铁合金(铁桶装)，以3-5m/s的喂丝速度喂入4.5-5.5m/t钛铁包芯线，最后喂入硅钙线2-3m/t进行钙处理；喂丝期间调整氩气流量，确保钢水不裸露；出站温度1600-1620℃；
3)LF出站后，对钢液进行软吹氩气，氩气流量10-40NL/min，软吹时间≥5分钟，喂钛线后严格控制在20min以内大包开浇；
步骤S3、浇铸生产铸坯：
1)钢水上连铸机进行浇注，开浇前对中间包冲击区及各个流次间进行氩气吹扫后启动钢包滑板开浇，开浇温度为1558～1578℃，目标过热度为40～60℃，拉速控制在1.9～2.5m/min，结晶器水流量为1850L/min，结晶器电磁搅拌参数为电流400A、频率4Hz，末端电磁搅拌参数为电流500A、频率10Hz，二冷比水流量0.8-1.0L/kg，浇注过程全程保护浇注；
2)在LF炉精炼末期，成分微调合格及温度达到1620～1650℃之后，先一次性加入1.0kg/t的锆铁合金(铁桶装)，再以3-5m/s的喂丝速度喂入4.5-5.5m/t钛铁包芯线，前期精炼深脱氧，控制了较低的氧含量，最终将锆含量控制在0.03～0.06％，钛含量控制在0.08～0.12％，稳定了锆、钛元素的收得率；
步骤S4、控轧控冷和线材轧制，得到热轧盘条；
步骤S5、对所述热轧盘条检验、打包入库。
上述方案中，所述步骤S2中钛铁包芯线的喂丝速度3～5m/s。
上述方案中，所述步骤S2中硅钙线喂丝后加入无碳覆盖剂+碳化稻壳保温。
上述方案中，所述步骤S3采用塞棒整体水口钢包，使用低碳钢保护渣。
进一步的，所述步骤S3中开浇前中间包进行吹氩操作，吹氩1～2分钟后启动钢包滑板开浇；中间包采用塞棒整体水口钢包，使用中间包保温覆盖剂，严禁使用碳化稻壳；大包开浇前清洗长水口并加密封垫、套长水口后开浇，确保长水口氩封正常，没入式水口插入深度控制在80～140mm之间，严禁偏流；开机第一轮中包温度液相线温度为1518℃，过热度为40～60℃；使用低碳钢保护渣，浇注过程勤加、少加、均匀加，视情况要求挑渣圈，保持结晶器液面稳定；对铸坯进行检查，对表面缺陷严重的连铸坯进行修磨处理。
上述方案中，所述步骤S4中：开轧温度1000～1060℃，进精轧880～920℃，MINI轧机900～940℃，吐丝温度860～900℃，保温罩及风机全部关闭。
与现有技术相比，本发明的有益效果是：
本发明提高Zr元素收得率，深度脱氧，减少ZrO 2等高熔点夹杂物生成、提高去除效果及降低结瘤；本发明生产工艺，控制产品的化学成分、力学性能稳定。本发明控制转炉终点碳含量，精炼过程严禁使用电石和碳化硅脱氧，喂丝后加入“无碳覆盖剂+碳化稻壳”保温，中间包采用无碳覆盖剂保温，减少冶炼、浇注过程中钢水增碳。本发明精炼前期选用适量铝线进行脱氧合金化，硅铁粉和铝豆扩散脱氧造白渣，严禁使用电石和碳化硅，白渣时间≥10分钟，进一步降低钢中[S]、气体含量。本发明Zr合金化：确保喂丝速度3～5m/s；精炼末期在C、Si、Mn、P、S、Al含量满足目标范围，一次性加入锆铁合金FeZr80，再一次性喂入钛铁包芯线FeTi70参考喂丝量4.5-5.5m/t，提高Ti、Zr收得率，喂丝期间调整氩气流量，确保钢水不裸露。本发明适当提高精炼渣量、调整Zr合金化后软吹流量及时间，确保钢中Al、Ti、Zr元素均匀性，减少元素二次氧化。本发明适当提高浇注温度以缓解钢水结瘤问题。本发明制订合理的坯料加热、盘条轧制工艺，确保产品质量。
附图说明
图1是本发明具体实施方式的抗拉程度和断面收缩率结果对比图。
图2是本发明具体实施方式的含Zr焊丝钢铸坯酸洗低倍照片，其中图2(a)为实施例1制得的含Zr焊丝钢铸坯酸洗低倍照片，图2(b)为实施例3制得的含Zr焊丝钢铸坯酸洗低倍照片。
具体实施方式
下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
实施例1
一种含Zr焊丝钢热轧盘条，所述含Zr焊丝钢热轧盘条的化学成分按照重量百分比计算：C0.06％，Si0.52％，Mn0.99％，P0.010％，S 0.001％，Cr 0.03％，Ni 0.010％，Cu 0.013，Mo 0.004，V 0.004，Ti 0.10，Al0.07％，Zr0.06％，余量为Fe和不可避免的杂质。
一种含Zr焊丝钢热轧盘条的生产工艺，包括以下步骤：
步骤S1、转炉冶炼脱氧合金化：
出钢成分控制要求：C：0.023％，P：0.007％，出钢温度：1620℃；出钢时进行脱氧合金化，加入合金的顺序及重量为：出钢1/3后加入3.4kg/t的铝锭预脱氧，并加入13kg/t的高硅硅锰和1.0kg/t的硅铁进行合金化；出钢2/3后一次性加入6.0kg/t的石灰和3.5kg/t的铝酸钙造渣料，形成精炼初渣；
步骤S2、LF精炼：
1)LF精炼炉进站之后补加造渣料，所述造渣料的组分为石灰4kg/t、0kg/t萤石，使炉渣具有良好的流动性以及碱度R为3.0；精炼过程采用铝豆和硅铁粉按照重量百分比为1:2进行扩散脱氧，将其分少量多次加在渣面上，总加入量为0.8kg/t；前期用铝线调整Al含量，目标值控制在0.10％；
2)Zr合金化：使用高硅硅锰或中碳锰铁、硅铁进行成分微调，使钢水中成分达标，其中C≤0.06％、Si:0.45％、Mn:1.01％、S：0.002％、Al:0.12％，成分检测合格以及温度达到1620后，先一次性加入1.0kg/t的锆铁合金(铁桶装)，以3m/s的喂丝速度喂入5m/t钛铁包芯线，钛铁包芯线的喂丝速度5m/s，最后喂入硅钙线2.5m/t进行钙处理；喂丝期间调整氩气流量，确保钢水不裸露；出站温度1600℃；硅钙线喂丝后加入无碳覆盖剂+碳化稻壳保温；
3)LF出站后，对钢液进行软吹氩气，氩气流量30NL/min，软吹时间≥5分钟，喂钛线后严格控制在20min以内大包开浇；
步骤S3、浇铸生产铸坯：
1)钢水上连铸机进行浇注，开浇前对中间包冲击区及各个流次间进行氩气吹扫后启动钢包滑板开浇，开浇温度为1558℃，目标过热度为50℃，拉速控制在2.2m/min，结晶器水流量为1850L/min，结晶器电磁搅拌参数为电流400A、频率4Hz，末端电磁搅拌参数为电流500A、频率10Hz，二冷比水流量为0.9L/kg，浇注过程全程保护浇注；
2)在LF炉精炼末期，成分微调合格及温度1620℃，先一次性加入1.0kg/t的锆铁合金 (铁桶装)，再以5m/s的喂丝速度喂入5.5m/t钛铁包芯线，目标前期精炼深脱氧，控制了较低的氧含量，最终将锆含量控制在0.06％，钛含量控制在0.10％，稳定了锆、钛元素的收得率；
开浇前中间包进行吹氩操作，吹氩1～2分钟后启动钢包滑板开浇；中间包采用塞棒整体水口钢包，使用中间包保温覆盖剂，严禁使用碳化稻壳；大包开浇前清洗长水口并加密封垫、套长水口后开浇，确保长水口氩封正常，没入式水口插入深度控制在120mm之间，严禁偏流；开机第一轮中包温度液相线温度为1518℃，过热度为50℃；使用低碳钢保护渣；对铸坯进行检查，对表面缺陷严重的连铸坯进行修磨处理；
步骤S4、控轧控冷和线材轧制：开轧温度1060℃，进精轧910℃，MINI轧机930℃，吐丝温度880℃，保温罩及风机全部关闭，得到热轧盘条；
步骤S5、对所述热轧盘条检验、打包入库。
实施例2
一种含Zr焊丝钢热轧盘条，所述含Zr焊丝钢热轧盘条的化学成分按照重量百分比计算：C0.06％，Si 0.52％，Mn0.98％，P 0.012％，S 0.002％，Cr 0.03％，Ni 0.007％，Cu 0.011，Mo 0.004，V 0.001，Ti 0.12％，Al：0.09％，Zr：0.03％，余量为Fe和不可避免的杂质。
一种含Zr焊丝钢热轧盘条的生产工艺，包括以下步骤：
步骤S1、转炉冶炼脱氧合金化：
出钢成分控制要求：C：0.029％，P：0.008％，出钢温度：1630℃；出钢时进行脱氧合金化，加入合金的顺序及重量为：出钢1/3后加入3.2kg/t的铝锭预脱氧，并加入14kg/t的高硅硅锰和0.5kg/t的硅铁进行合金化；出钢2/3后一次性加入6.5kg/t的石灰和3kg/t的铝酸钙造渣料，形成精炼初渣；
步骤S2、LF精炼：
1)LF精炼炉进站之后补加造渣料，所述造渣料的组分为石灰6kg/t、1kg/t萤石，使炉渣具有良好的流动性以及碱度R为2.0；精炼过程采用铝豆和硅铁粉按照重量百分比为1:2进行扩散脱氧，将其分少量多次加在渣面上，总加入量为0.5kg/t；前期用铝线调整Al含量，目标值控制在0.08％；
2)Zr合金化：使用高硅硅锰或中碳锰铁、硅铁进行成分微调，使钢水中成分达标，其中C≤0.06％、Si:0.5％、Mn:0.95％、S：0.003％、Al:0.08％，成分检测合格以及温度达到1635℃后，先一次性加入1.0kg/t的锆铁合金(铁桶装)，以4m/s的喂丝速度喂入4.5m/t钛铁包芯线，最后喂入硅钙线2m/t进行钙处理；喂丝期间调整氩气流量，确保钢水不裸露；出站温度1620℃；硅钙线喂丝后加入无碳覆盖剂+碳化稻壳保温；
3)LF出站后，对钢液进行软吹氩气，氩气流量10NL/min，软吹时间≥5分钟，喂钛线后严格控制在20min以内大包开浇；
步骤S3、浇铸生产铸坯：
1)钢水上连铸机进行浇注，开浇前对中间包冲击区及各个流次间进行氩气吹扫后启动钢包滑板开浇，开浇温度为1578℃，目标过热度为60℃，拉速控制在1.9m/min，结晶器水流量为1850L/min，结晶器电磁搅拌参数为电流400A、频率4Hz，末端电磁搅拌参数为电流500A、频率10Hz，二冷比水流量为0.8L/kg，浇注过程全程保护浇注；
2)在LF炉精炼末期，成分微调合格及温度1635℃，先一次性加入1.0kg/t的锆铁合金(铁桶装)，以3m/s的喂丝速度喂入4.5m/t钛铁包芯线，前期精炼深脱氧，控制了较低的氧含量，最终将锆含量控制在0.03％，钛含量控制在0.12％，稳定了锆、钛元素的收得率；
开浇前中间包进行吹氩操作，吹氩1～2分钟后启动钢包滑板开浇；中间包采用塞棒整体水口钢包，使用中间包保温覆盖剂，严禁使用碳化稻壳；大包开浇前清洗长水口并加密封垫、套长水口后开浇，确保长水口氩封正常，没入式水口插入深度控制在80mm之间，严禁偏流；开机第一轮中包温度液相线温度为1518℃，过热度为40℃；使用低碳钢保护渣；对铸坯进行检查，对表面缺陷严重的连铸坯进行修磨处理；
步骤S4、控轧控冷和线材轧制：开轧温度1000℃，进精轧880℃，MINI轧机900℃，吐丝温度860℃，保温罩及风机全部关闭，得到热轧盘条；
步骤S5、对所述热轧盘条检验、打包入库。
实施例3
一种含Zr焊丝钢热轧盘条，所述含Zr焊丝钢热轧盘条的化学成分按照重量百分比计算：C0.06％，Si 0.55％，Mn0.97％，P 0.014％，S 0.001％，Cr 0.04％，Ni 0.008％，Cu 0.010，Mo 0.004，V 0.003，Ti 0.08％，Al：0.09％，Zr：0.05％，余量为Fe和不可避免的杂质。
一种含Zr焊丝钢热轧盘条的生产工艺，包括以下步骤：
步骤S1、转炉冶炼脱氧合金化：
出钢成分控制要求：C：0.033％，P：0.009％，出钢温度：1646℃；出钢时进行脱氧合金化，加入合金的顺序及重量为：出钢1/3后加入4.0kg/t的铝锭预脱氧，并加入13.6kg/t的高硅硅锰和0.80kg/t的硅铁进行合金化；出钢2/3后一次性加入5.5kg/t的石灰和4kg/t的铝酸钙造渣料，形成精炼初渣；
步骤S2、LF精炼：
1)LF精炼炉进站之后补加造渣料，所述造渣料的组分为石灰8kg/t、3kg/t萤石，使炉渣具有良好的流动性以及碱度R为5.0；精炼过程采用铝豆和硅铁粉按照重量百分比为1:2进行 扩散脱氧，将其分少量多次加在渣面上，总加入量为1.0kg/t；前期用铝线调整Al含量，目标值控制在0.13％；
2)Zr合金化：使用高硅硅锰或中碳锰铁、硅铁进行成分微调，使钢水中成分达标，其中C≤0.06％、Si:0.55％、Mn:1.05％、S：0.001％、Al:0.13％，成分检测合格以及温度达到1650后，先一次性加入1.0kg/t的锆铁合金(铁桶装)，以5m/s的喂丝速度喂入5.5m/t钛铁包芯线，最后喂入硅钙线3m/t进行钙处理；喂丝期间调整氩气流量，确保钢水不裸露；出站温度1610℃；硅钙线喂丝后加入无碳覆盖剂+碳化稻壳保温；
3)LF出站后，对钢液进行软吹氩气，氩气流量40NL/min，软吹时间≥5分钟，喂钛线后严格控制在20min以内大包开浇；
步骤S3、浇铸生产铸坯：
1)钢水上连铸机进行浇注，开浇前对中间包冲击区及各个流次间进行氩气吹扫后启动钢包滑板开浇，开浇温度为1560℃，目标过热度为40℃，拉速控制在2.5m/min，结晶器水流量为1850L/min，结晶器电磁搅拌参数为电流400A、频率4Hz，末端电磁搅拌参数为电流500A、频率10Hz，二冷比水流量为1.0L/kg，浇注过程全程保护浇注；
2)在LF炉精炼末期，成分微调合格及温度1650℃、成分检测合格后，先一次性加入1.0kg/t的锆铁合金(铁桶装)，以4m/s的喂丝速度喂入5.0m/t钛铁包芯线，目标前期精炼深脱氧，控制了较低的氧含量，最终将锆含量控制在0.05％，钛含量控制在0.08％，稳定了锆、钛元素的收得率；
开浇前中间包进行吹氩操作，吹氩1～2分钟后启动钢包滑板开浇；中间包采用塞棒整体水口钢包，使用中间包保温覆盖剂，严禁使用碳化稻壳；大包开浇前清洗长水口并加密封垫、套长水口后开浇，确保长水口氩封正常，没入式水口插入深度控制在140mm之间，严禁偏流；开机第一轮中包温度液相线温度为1518℃，过热度为60℃；使用低碳钢保护渣；对铸坯进行检查，对表面缺陷严重的连铸坯进行修磨处理；
步骤S4、控轧控冷和线材轧制：开轧温度1030℃，进精轧920℃，MINI轧机940℃，吐丝温度900℃，保温罩及风机全部关闭，得到热轧盘条；
步骤S5、对所述热轧盘条检验、打包入库。
本发明通过合理安排Zr-Ti-Al合金化顺序、锆的加入方式及加入时机、使得Zr-Ti-Al元素在钢中的均匀分布、解决钢中Zr-Ti-Al元素的二次氧化问题、解决浇注过程水口结瘤问题、改善连铸坯表面质量问题。
如图1所示，为实施例1和实施例3所得含Zr焊丝钢热轧盘条的样品抗拉程度和断面收缩率结果对比图；其中编号为X4190204400101、X4190204400102、X4190319500101、X41 90319500102的是实施例1制得的含Zr焊丝钢热轧盘条轧制试片号，编号为X4190204400101、X4190204400102、X4190319500101、X4190319500102的是实施例3制得的含Zr焊丝钢热轧盘条轧制试片号，从图1中可以看出本发明生产的盘条力学性能满足“抗拉强度≤600MPa、断面收缩率≥60％”要求。
如表1所示为实施例1和实施例3的钢坯低倍检测情况，其中样品1、2、3为实施例1制得的含Zr焊丝钢钢坯低倍检测结果，样品4、5、6和7为实施例3制得的含Zr焊丝钢钢坯低倍检测结果，可以看出钢坯低倍情况较好，中心疏松、偏析等指标符合要求。
Figure PCTCN2021140663-appb-000001
如图2所示，图2(a)为实施例1制得的含Zr焊丝钢铸坯酸洗低倍照片，图2(b)为实施例3制得的含Zr焊丝钢铸坯酸洗低倍照片，可以看出铸坯酸洗表面良好，连铸坯低倍质量符合产品要求。
应当理解，虽然本说明书是按照各个实施例描述的，但并非每个实施例仅包含一个独立的技术方案，说明书的这种叙述方式仅仅是为清楚起见，本领域技术人员应当将说明书作为一个整体，各实施例中的技术方案也可以经适当组合，形成本领域技术人员可以理解的其他实施方式。
上文所列出的一系列的详细说明仅仅是针对本发明的可行性实施例的具体说明，它们并非用以限制本发明的保护范围，凡未脱离本发明技艺精神所作的等效实施例或变更均应包含在本发明的保护范围之内。

Claims (9)

  1. 一种含Zr焊丝钢热轧盘条，其特征在于，其化学成分按照重量百分比计算为：C≤0.06％，Si：0.45～0.55％，Mn：0.95～1.05％，P≤0.020％，S：≤0.018％，Cr：≤0.10％，Ni：≤0.10％，Cu：≤0.20，Mo：≤0.10，V：≤0.02，Ti：0.07～0.13％，Al：0.06～0.12％，Zr：0.03～0.09％，余量为Fe和不可避免的杂质；
    所述含Zr焊丝钢热轧盘条是按照以下工艺生产的，包括以下步骤：
    步骤S1、转炉冶炼脱氧合金化：
    出钢成分控制要求：C≤0.03％，P≤0.010％，出钢温度≥1620℃；出钢时进行脱氧合金化，加入合金的顺序及重量为：出钢1/3后加入3.2-4.0kg/t的铝锭预脱氧，并加入13-14kg/t的高硅硅锰和0.5-1.0kg/t的硅铁进行合金化；出钢2/3后一次性加入5.5-6.5kg/t的石灰和3-4kg/t的铝酸钙造渣料，形成精炼初渣；
    步骤S2、LF精炼：
    1)LF精炼炉进站之后补加造渣料，所述造渣料的组分为石灰4-8kg/t、0-3kg/t萤石，使炉渣具有良好的流动性以及碱度R为2.0-5.0；精炼过程采用铝豆和硅铁粉按照重量百分比为1:2进行扩散脱氧，将其分少量多次加在渣面上，总加入量为0.5-1.0kg/t；前期用铝线调整Al含量，目标值控制在0.08-0.13％；
    2)Zr合金化：使用高硅硅锰或中碳锰铁、硅铁进行成分微调，使钢水中成分达标，其中C≤0.06％、Si:0.45～0.55％、Mn:0.95～1.05％、S≤0.003％、Al:0.08～0.13％，成分检测合格以及温度达到1620～1650℃后，先一次性加入1.0kg/t的锆铁合金，以3-5m/s的喂丝速度喂入4.5-5.5m/t钛铁包芯线，最后喂入硅钙线2-3m/t进行钙处理；喂丝期间调整氩气流量，确保钢水不裸露；出站温度1600-1620℃；
    3)LF出站后，对钢液进行软吹氩气，氩气流量10-40NL/min，软吹时间≥5分钟，喂钛线后严格控制在20min以内大包开浇；
    步骤S3、浇铸生产铸坯：
    1)钢水上连铸机进行浇注，开浇前对中间包冲击区及各个流次间进行氩气吹扫后启动钢包滑板开浇，开浇温度为1558～1578℃，目标过热度为40～60℃，拉速控制在1.9～2.5m/min，结晶器水流量为1850L/min，结晶器电磁搅拌参数为电流400A、频率4Hz，末端电磁搅拌参数为电流500A、频率10Hz，二冷比水流量为0.8-1.0L/kg，浇注过程全程保护浇注；
    2)在LF炉精炼末期，成分微调合格及温度达到1620～1650℃之后，先一次性加入1.0kg/t的锆铁合金，再以3-5m/s的喂丝速度喂入4.5-5.5m/t钛铁包芯线，最终将锆含量控制在0.03～0.06％，钛含量控制在0.08～0.12％，稳定了锆、钛元素的收得率；
    步骤S4、控轧控冷和线材轧制，得到热轧盘条；
    步骤S5、对所述热轧盘条检验、打包入库。
  2. 根据权利要求1所述的含Zr焊丝钢热轧盘条，其特征在于，其化学成分按照重量百分比计算为：C0.06％，Si0.52％，Mn0.99％，P0.010％，S 0.001％，Cr 0.03％，Ni 0.010％，Cu 0.013，Mo 0.004，V 0.004，Ti 0.10，Al0.07％，Zr0.06％，余量为Fe和不可避免的杂质。
  3. 根据权利要求1所述的含Zr焊丝钢热轧盘条，其特征在于，其化学成分按照重量百分比计算为：C0.06％，Si 0.52％，Mn0.98％，P 0.012％，S 0.002％，Cr 0.03％，Ni 0.007％，Cu 0.011，Mo 0.004，V 0.001，Ti 0.12％，Al：0.09％，Zr：0.03％，余量为Fe和不可避免的杂质。
  4. 根据权利要求1所述的含Zr焊丝钢热轧盘条，其特征在于，其化学成分按照重量百分比计算为：C0.06％，Si 0.55％，Mn0.97％，P 0.014％，S 0.001％，Cr 0.04％，Ni 0.008％，Cu 0.010，Mo 0.004，V 0.003，Ti 0.08％，Al：0.09％，Zr：0.05％，余量为Fe和不可避免的杂质，余量为Fe和不可避免的杂质。
  5. 根据权利要求1所述的含Zr焊丝钢热轧盘条，其特征在于，所述步骤S2中钛铁包芯线的喂丝速度3～5m/s。
  6. 根据权利要求1所述的含Zr焊丝钢热轧盘条，其特征在于，所述步骤S2中硅钙线喂丝后加入无碳覆盖剂+碳化稻壳保温。
  7. 根据权利要求1所述的含Zr焊丝钢热轧盘条，其特征在于，所述步骤S3采用塞棒整体水口钢包，使用低碳钢保护渣。
  8. 根据权利要求7所述的含Zr焊丝钢热轧盘条，其特征在于，所述步骤S3中开浇前中间包进行吹氩操作，吹氩1～2分钟后启动钢包滑板开浇；中间包采用塞棒整体水口钢包，使用中间包保温覆盖剂，严禁使用碳化稻壳；大包开浇前清洗长水口并加密封垫、套长水口后开浇，确保长水口氩封正常，没入式水口插入深度控制在80～140mm之间，严禁偏流；开机第一轮中包温度液相线温度为1518℃，过热度为40～60℃；使用低碳钢保护渣；对铸坯进行检查，对表面缺陷严重的连铸坯进行修磨处理。
  9. 根据权利要求1所述的含Zr焊丝钢热轧盘条，其特征在于，所述步骤S4中：开轧温度1000～1060℃，进精轧880～920℃，轧机900～940℃，吐丝温度860～900℃，保温罩及风机全部关闭。
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