CN113943893A - Production method of 700 MPa-grade rare earth-containing welding wire steel - Google Patents

Production method of 700 MPa-grade rare earth-containing welding wire steel Download PDF

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Publication number
CN113943893A
CN113943893A CN202111108088.5A CN202111108088A CN113943893A CN 113943893 A CN113943893 A CN 113943893A CN 202111108088 A CN202111108088 A CN 202111108088A CN 113943893 A CN113943893 A CN 113943893A
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rare earth
percent
welding wire
production method
wire steel
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CN202111108088.5A
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吕刚
赵晓敏
杨鲁明
白月琴
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel 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
    • 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
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • 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
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a production method of a rare earth-containing 700 MPa-grade welding wire steel, which mainly comprises the following preparation processes: molten iron desulfurization, converter, LF refining and continuous casting. The prepared 700 MPa-grade rare earth-containing welding wire steel can improve the corrosion resistance and low-temperature impact toughness of a welding seam.

Description

Production method of 700 MPa-grade rare earth-containing welding wire steel
Technical Field
The invention relates to the technical field of metallurgy, in particular to a production method of welding wire steel containing rare earth at 700 MPa.
Background
The 700 MPa-grade welding wire steel is high-strength welding steel and is mainly used for welding engineering machinery manufacturing, boiler pressure vessels, automobile industry, bridge building structures and the like. The rare earth has good improvement effect on the welding performance of the welding wire steel, and can improve the corrosion resistance and the low-temperature impact toughness of the welding line.
Disclosure of Invention
The invention aims to provide a production method of 700MPa grade welding wire steel containing rare earth on the basis of 700MPa grade welding wire steel production, and solves the technical problems in rare earth and low-carbon steel steelmaking control.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a production method of rare earth-containing 700 MPa-grade welding wire steel, which mainly comprises the following production steps:
the C content in the molten steel at the converter end point is not less than 0.06 wt%, and the P content is not more than 0.025 wt%; the converter tapping temperature is 1620-1644 ℃, and a deoxidizer aluminum iron is added into the converter tapping; after the ladle reaches the refining step, measuring the temperature when the ladle bottom is soft and argon is blown for 5min, and fixing oxygen after the molten steel stops blowing argon and is calmed for 1 min; controlling the target of active oxygen to be 40-50ppm, and supplementing an aluminum deoxidizer when the oxygen is high;
after LF refining is finished, adding a calcium iron wire for calcium treatment to convert high-melting-point Al2O3 into low-melting-point calcium aluminate, improving castability, effectively preventing nozzle nodulation, simultaneously adding rare earth alloy to ensure that soft blowing is carried out for more than 8 minutes after refining, and ensuring the uniformity of ladle temperature and the floating of fine inclusions; the continuous casting superheat degree is set to be 25-35 ℃, and the drawing speed is 1.9-2.2 m/min.
Further, the chemical components are obtained by mass percent: c is less than or equal to 0.10%, Si: 0.45-0.60%, Mn: 1.55-1.70%, Cr: 0.15-0.25%, Ti 0.05-0.16%, Ni: 0.65-0.75%, Mo: 0.20-0.30%, RE: 0.0001-0.0020 percent, and the balance of Fe and inevitable impurities, wherein P in the impurities is less than or equal to 0.020 percent, and S is less than or equal to 0.020 percent.
Further, the chemical components are obtained by mass percent: c: 0.06%, Si: 0.503%, Mn: 1.61%, Cr: 0.18%, Ti 0.06%, Ni: 0.68%, Mo: 0.23%, RE: 5ppm, the balance being Fe and unavoidable impurities, P: 0.012 percent and 0.005 percent of S.
Further, the chemical components are obtained by mass percent: c: 0.06%, Si: 0.514%, Mn: 1.62%, Cr: 0.17%, Ti 0.06%, Ni: 0.66%, Mo: 0.20%, RE: 2ppm, the balance being Fe and unavoidable impurities, P: 0.009%, and S0.006%.
Further, the chemical components are obtained by mass percent: c: 0.06%, Si: 0.597%, Mn: 1.60%, Cr: 0.18%, Ti 0.06%, Ni: 0.68%, Mo: 0.23%, RE: 1ppm, the balance being Fe and unavoidable impurities, P: 0.012 percent and 0.005 percent of S.
Compared with the prior art, the invention has the beneficial technical effects that:
by adding the rare earth element, the low-temperature impact toughness of the welding seam is improved by more than 30 percent compared with the low-temperature impact toughness of the similar welding wire without the rare earth element, and meanwhile, the corrosion resistance of the welding wire is also improved to a certain extent.
The corrosion resistance and the low-temperature impact toughness of the welding line are effectively improved.
Detailed Description
The main preparation process of the 700MPa grade welding wire steel containing rare earth in the embodiment is as follows: molten iron desulfurization, converter, LF refining and continuous casting.
Molten iron desulphurization: blast furnace slag is removed before desulfurization so as to improve desulfurization efficiency; melting iron ore into molten iron, desulfurizing the molten iron by a KR method, namely stirring the molten iron by a stirring paddle with the rotating speed of 90r/min for 2min, and adding a desulfurizing agent, wherein the desulfurizing agent is 9: 1, stirring and reacting the mixed lime powder and fluorite for 10min, and standing for 5 min. And after the molten iron is desulfurized and stood, the desulfurized slag is removed, the desulfurization effect is stabilized, the desulfurized slag is prevented from entering a converter to cause the resulfurization of the converter, and the sulfur content in the steel is ensured to be controlled below 0.01 percent.
Converter: smelting by a combined blown converter, adopting a double slag method and a post-furnace recarburization process. Tapping for one time, using a slag blocking ball or a slag blocking plug to block slag during tapping, and finally deoxidizing by adopting ferro-aluminum. End point control target: c is less than or equal to 0.05 percent, and the tapping temperature T is more than or equal to 1620 ℃. The addition of the deoxidizer is started when the molten steel is tapped to 1/3, the addition of the alloy is started after the addition of the deoxidizer, and the addition amount of the alloy is adjusted according to the end point carbon and the tapping amount.
Refining: the converter molten steel is transported to a refining operation line by a ladle transport vehicle and refined in the whole Ar blowing state. Heating in a mode of gradually increasing the temperature rising speed from low grade to high grade, and carrying out slagging, fine adjustment and temperature rising operation according to the components and temperature change of the molten steel. In order to ensure the low-carbon requirement of the finished wire rod, the carbon content is strictly controlled by LF refining, and the carbon content is controlled to be 0.05%. After the ladle reaches the refining process, the temperature is measured when the ladle bottom is soft and argon is blown for 5min, and oxygen is determined after the molten steel stops blowing argon and is calmed for 1 min. The active oxygen control target is 40-50ppm, and when the oxygen is high, the aluminium deoxidizer is added. In the refining process, 400kg of lime and 50-100kg of fluorite are added for slagging and desulfurization. After LF refining is finished, 500 m iron-calcium wires are added for calcium treatment, so that high-melting-point Al2O3 is converted into low-melting-point calcium aluminate, the castability is improved, nozzle nodulation is effectively prevented, meanwhile, rare earth ferroalloy (the addition amount is 30ppm) is added, soft blowing is guaranteed for more than 8 minutes, and the uniformity of ladle temperature and floating of fine inclusions are guaranteed. The oxygen content in steel directly affects the yield of rare earth.
Continuous casting: the water amount of the crystallizer is 130-.
TABLE 1 composition and temperature of converter tapping
Tapping temperature, DEG C Carbon content of steel tapping, wt% Phosphorus content of tapping, wt%
Example 1 1622 0.04 0.012
Example 2 1643 0.05 0.010
Example 3 1634 0.03 0.014
TABLE 2 continuous casting Process parameters
Degree of superheat (. degree. C.) Pulling speed (m/min)
Example 1 28 2.1
Example 2 29 2.1
Example 3 30 2.1
TABLE 3 relationship between refining activity oxygen and rare earth yield
Figure BDA0003273239080000041
TABLE 4 Final product composition (wt%, balance iron)
C Si Mn P S Cr Ti Ni Mo RE(ppm)
Example 1 0.06 0.503 1.61 0.012 0.005 0.18 0.06 0.68 0.23 5
Example 2 0.06 0.514 1.62 0.009 0.006 0.17 0.06 0.66 0.20 2
Example 3 0.06 0.597 1.60 0.012 0.005 0.18 0.06 0.68 0.23 1
By adding the rare earth element, the low-temperature impact toughness of the welding line is improved by more than 30 percent compared with the low-temperature impact toughness of the similar welding wire without the rare earth element, and meanwhile, the corrosion resistance of the welding line is also improved to a certain extent.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.

Claims (5)

1. A production method of 700MPa grade welding wire steel containing rare earth is characterized by mainly comprising the following production steps:
the C content in the molten steel at the converter end point is not less than 0.06 wt%, and the P content is not more than 0.025 wt%; the converter tapping temperature is 1620-1644 ℃, and a deoxidizer aluminum iron is added into the converter tapping; after the ladle reaches the refining step, measuring the temperature when the ladle bottom is soft and argon is blown for 5min, and fixing oxygen after the molten steel stops blowing argon and is calmed for 1 min; controlling the target of active oxygen to be 40-50ppm, and supplementing an aluminum deoxidizer when the oxygen is high;
after LF refining is finished, adding a calcium iron wire for calcium treatment to convert high-melting-point Al2O3 into low-melting-point calcium aluminate, improving castability, effectively preventing nozzle nodulation, simultaneously adding rare earth alloy to ensure that soft blowing is carried out for more than 8 minutes after refining, and ensuring the uniformity of ladle temperature and the floating of fine inclusions; the continuous casting superheat degree is set to be 25-35 ℃, and the drawing speed is 1.9-2.2 m/min.
2. The production method of the rare earth-containing 700MPa grade welding wire steel according to claim 1, characterized in that the chemical components are obtained by mass percent: c is less than or equal to 0.10%, Si: 0.45-0.60%, Mn: 1.55-1.70%, Cr: 0.15-0.25%, Ti 0.05-0.16%, Ni: 0.65-0.75%, Mo: 0.20-0.30%, RE: 0.0001-0.0020 percent, and the balance of Fe and inevitable impurities, wherein P in the impurities is less than or equal to 0.020 percent, and S is less than or equal to 0.020 percent.
3. The production method of the rare earth-containing 700MPa grade welding wire steel according to claim 2, characterized in that the chemical components are obtained by mass percent: c: 0.06%, Si: 0.503%, Mn: 1.61%, Cr: 0.18%, Ti 0.06%, Ni: 0.68%, Mo: 0.23%, RE: 5ppm, the balance being Fe and unavoidable impurities, P: 0.012 percent and 0.005 percent of S.
4. The production method of the rare earth-containing 700MPa grade welding wire steel according to claim 1, characterized in that the chemical components are obtained by mass percent: c: 0.06%, Si: 0.514%, Mn: 1.62%, Cr: 0.17%, Ti 0.06%, Ni: 0.66%, Mo: 0.20%, RE: 2ppm, the balance being Fe and unavoidable impurities, P: 0.009%, and S0.006%.
5. The production method of the rare earth-containing 700MPa grade welding wire steel according to claim 1, characterized in that the chemical components are obtained by mass percent: c: 0.06%, Si: 0.597%, Mn: 1.60%, Cr: 0.18%, Ti 0.06%, Ni: 0.68%, Mo: 0.23%, RE: 1ppm, the balance being Fe and unavoidable impurities, P: 0.012 percent and 0.005 percent of S.
CN202111108088.5A 2021-09-22 2021-09-22 Production method of 700 MPa-grade rare earth-containing welding wire steel Pending CN113943893A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114571133A (en) * 2022-02-16 2022-06-03 包头钢铁（集团）有限责任公司 Weather-resistant 550 MPa-grade welding wire steel
CN114905120A (en) * 2022-05-11 2022-08-16 包头钢铁（集团）有限责任公司 Method for improving welding performance of welding wire
CN116752040A (en) * 2023-06-13 2023-09-15 包头钢铁（集团）有限责任公司 Production method of titanium-nickel-molybdenum series 700 MPa-grade welding wire steel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114571133A (en) * 2022-02-16 2022-06-03 包头钢铁（集团）有限责任公司 Weather-resistant 550 MPa-grade welding wire steel
CN114905120A (en) * 2022-05-11 2022-08-16 包头钢铁（集团）有限责任公司 Method for improving welding performance of welding wire
CN114905120B (en) * 2022-05-11 2024-06-11 包头钢铁（集团）有限责任公司 Method for improving welding performance of welding wire
CN116752040A (en) * 2023-06-13 2023-09-15 包头钢铁（集团）有限责任公司 Production method of titanium-nickel-molybdenum series 700 MPa-grade welding wire steel

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Application publication date: 20220118