CN113462961B - Production method of rare earth-containing round-link chain wire rod - Google Patents

Production method of rare earth-containing round-link chain wire rod Download PDF

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CN113462961B
CN113462961B CN202110625108.XA CN202110625108A CN113462961B CN 113462961 B CN113462961 B CN 113462961B CN 202110625108 A CN202110625108 A CN 202110625108A CN 113462961 B CN113462961 B CN 113462961B
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rare earth
wire rod
link chain
tapping
chain wire
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CN113462961A (en
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吕刚
涛雅
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
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a method for producing a rare earth-containing round-link chain wire rod, which mainly comprises the following processes of molten iron desulphurization, converter, LF refining, continuous casting and wire rod rolling; the chemical components (by mass percent) are as follows: 0.17-0.24% of C, 0.17-0.37% of Si, 1.50-1.80% of Mn, 0.001-0.003% of B, 0.0009-0.0020% of RE element Ce0.0009, and the balance of Fe and inevitable impurities, wherein P in the impurities is less than or equal to 0.020%, and S in the impurities is less than or equal to 0.020%. The invention aims to provide a production method of a rare earth-containing round-link chain wire rod, which aims to improve the Hanjie performance of the round-link chain wire rod.

Description

Production method of rare earth-containing round-link chain wire rod
Technical Field
The invention relates to a production method of a rare earth-containing round-link chain wire rod.
Background
20Mn2A is a common round-link chain wire rod and is mainly used for producing round-link chains, but the performance is not good enough at present, and how to improve the welding performance and the corrosion resistance is a problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a production method of a rare earth-containing round-link chain wire rod.
In order to solve the technical problems, the invention adopts the following technical scheme:
a production method of a rare earth-containing round-link chain wire rod comprises the following steps:
the converter operation fully utilizes the advantages of a top-bottom combined blown converter, adopts a low-oxygen-pressure large-flow oxygen lance technology, strives for one-time converter-reversing tapping by adopting high-carbon-drawing operation on the premise of ensuring the slag-making and P-removing in the front and middle stages and the slag-making and S-removing in the middle and later stages, and achieves the tapping target requirements that C is more than or equal to 0.08 percent and P is less than or equal to 0.015 percent; slag stopping tapping is adopted for converter tapping, and slag discharging is strictly controlled to prevent P return;
after LF refining is finished, adding iron calcium wire for calcium treatment to enable high-melting-point Al 2 O 3 The calcium aluminate with low melting point is converted, the castability is improved, the nozzle nodulation is effectively prevented, meanwhile, the rare earth alloy is added, the soft blowing after refining is ensured for more than 10 minutes, and the uniformity of the ladle temperature and the floating of fine impurities are ensured; the superheat degree of continuous casting is set to be 25-35 ℃, and the drawing speed is 1.9-2.2 m/min; in order to ensure that the ideal structure of 20Mn2A ferrite and pearlite is obtained, controlled cooling is carried out by adopting a high spinning temperature and a delayed cooling process according to the characteristics of steel grades, and the initial rolling temperature is as follows: 1000 +/-30 ℃, finish rolling temperature of 890 +/-20 ℃, spinning temperature of 850 +/-20 ℃, stelmor cooling fan closing, first and second heat-preserving covers opening, last three heat-preserving covers opening, the rest all closing, cooling roller speed: 0.17m/s, 0.19m/s, 0.21m/s, 0.23m/s, 0.25m/s, 0.27m/s, 0.29m/s, 0.31m/s, 0.33m/s, 0.35 m/s.
Further, the rare earth-containing round-link chain wire rod comprises the following chemical components in percentage by mass: 0.17-0.24% of C, 0.17-0.37% of Si, 1.50-1.80% of Mn, 0.001-0.003% of B, 0.0009-0.0020% of RE element Ce, and the balance of Fe and inevitable impurities, wherein P in the impurities is less than or equal to 0.020%, and S in the impurities is less than or equal to 0.020%.
Further, continuous casting: the water amount of the crystallizer is 130-.
Further, 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.
Compared with the prior art, the invention has the beneficial technical effects that:
through adding rare earth, the corrosion resistance of the round-link chain containing the rare earth 20Mn2A is improved by 30 percent compared with that of the common round-link chain through the use evaluation of users, and the round-link chain is easier to weld and less prone to weld cracking.
Detailed Description
The main preparation process of the rare earth 20Mn 2A-containing round-link chain steel in the embodiment is as follows: the method comprises the steps of molten iron desulfurization, converter, LF refining, continuous casting and wire rod rolling.
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 more than or equal to 0.08 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: and conveying the converter molten steel to a refining operation line by a ladle transfer car, and refining in a full-process 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.
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 10 minutes after refining, and ensuring the uniformity of ladle temperature and the floating of fine inclusions; continuous casting: the water amount of the crystallizer is 130-135m3, the air fog cooling is adopted, the covering slag adopts the special covering slag for universal circulation, the electromagnetic stirring frequency of the crystallizer is 3.5Hz, the current is 270A, and the pulling speed is 2.1 m/min.
Rolling: in order to ensure that the ideal structure of 20Mn2A ferrite and pearlite is obtained, controlled cooling is carried out by adopting a high spinning temperature and a delayed cooling process according to the characteristics of steel grades, and the initial rolling temperature is as follows: 1000 +/-30 ℃, finish rolling temperature of 890 +/-20 ℃, spinning temperature of 850 +/-20 ℃, stelmor cooling fan closing, first and second heat-preserving covers opening, last three heat-preserving covers opening, the rest all closing, cooling roller speed: 0.17m/s, 0.19m/s, 0.21m/s, 0.23m/s, 0.25m/s, 0.27m/s, 0.29m/s, 0.31m/s, 0.33m/s, 0.35 m/s.
TABLE 1 composition and temperature of converter tapping
Tapping temperature, DEG C Carbon content of steel tapping, wt% Phosphorus content of the tap, wt%
Example 1 1632 0.08 0.011
Example 2 1634 0.10 0.010
TABLE 2 continuous casting Process parameters
Degree of superheat (. degree. C.) Pulling speed(m/min)
Example 1 28 2.1
Example 2 31 2.1
TABLE 3 relationship between refining activity oxygen and rare earth yield
Figure BDA0003101878620000041
TABLE 4 Final product composition (wt%, balance iron)
Figure BDA0003101878620000042
TABLE 5 mechanical Properties
Rm/MPa Z/％
Example 1 610 64
Example 2 612 61
Require that ≤680 ≥50
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims (3)

1. A production method of a rare earth-containing round-link chain wire rod is characterized by comprising the following steps: the method comprises the following steps:
the converter operation fully utilizes the advantages of a top-bottom combined blown converter, adopts a low-oxygen-pressure large-flow oxygen lance technology, strives for one-time converter-reversing tapping by adopting high-carbon-drawing operation on the premise of ensuring the slag-making and P-removing in the front and middle stages and the slag-making and S-removing in the middle and later stages, and achieves the tapping target requirements that C is more than or equal to 0.08 percent and P is less than or equal to 0.015 percent; slag stopping tapping is adopted for converter tapping, and slag discharging is strictly controlled to prevent P return;
after LF refining is finished, adding a ferro-calcium wire for calcium treatment to convert high-melting-point Al2O3 into low-melting-point calcium aluminate, improving the castability, effectively preventing nozzle nodulation, simultaneously adding rare earth alloy to ensure that soft blowing is carried out for more than 10 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; in order to ensure that the ideal structure of 20Mn2A ferrite and pearlite is obtained, controlled cooling is carried out by adopting a high spinning temperature and a delayed cooling process according to the characteristics of steel grades, and the initial rolling temperature is as follows: 1000 +/-30 ℃, finish rolling temperature of 890 +/-20 ℃, spinning temperature of 850 +/-20 ℃, stelmor cooling fan closing, first and second heat-preserving covers opening, last three heat-preserving covers opening, the rest all closing, cooling roller speed: 0.17m/s, 0.19m/s, 0.21m/s, 0.23m/s, 0.25m/s, 0.27m/s, 0.29m/s, 0.31m/s, 0.33m/s, 0.35 m/s;
the rare earth-containing round-link chain wire rod comprises the following chemical components in percentage by mass: 0.17-0.24% of C, 0.17-0.37% of Si, 1.50-1.80% of Mn, 0.001-0.003% of B, 0.0009-0.0020% of RE element Ce, and the balance of Fe and inevitable impurities, wherein P in the impurities is less than or equal to 0.020%, and S in the impurities is less than or equal to 0.020%.
2. The method for producing a rare earth-containing round-link chain wire rod according to claim 1, wherein: continuous casting: the water amount of the crystallizer is 130-.
3. The method for producing a rare earth-containing round-link chain wire rod according to claim 1, wherein: 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.
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CN114507765A (en) * 2022-01-04 2022-05-17 包头钢铁（集团）有限责任公司 Method for improving rare earth yield by controlling slag amount of ladle furnace
CN114635081A (en) * 2022-02-11 2022-06-17 包头钢铁（集团）有限责任公司 Production method of high-quality round-link chain wire rod
CN114635073A (en) * 2022-02-17 2022-06-17 包头钢铁（集团）有限责任公司 Production method of 38CrMoAl steel nitride wire rod

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CN104561730B (en) * 2014-12-22 2016-09-07 天津钢铁集团有限公司 A kind of production method of GCr15 Bearing Steel Billet
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