CN112342451A - Production method of rare earth-containing H08A electrode steel - Google Patents
Production method of rare earth-containing H08A electrode steel Download PDFInfo
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- CN112342451A CN112342451A CN202010910392.0A CN202010910392A CN112342451A CN 112342451 A CN112342451 A CN 112342451A CN 202010910392 A CN202010910392 A CN 202010910392A CN 112342451 A CN112342451 A CN 112342451A
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- 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
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- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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- 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
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- 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
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- 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
- C21C7/064—Dephosphorising; Desulfurising
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing 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 method for producing rare earth-containing H08A electrode 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; the active oxygen control target is less than 50ppm, and when the oxygen is high, the aluminum deoxidizer is added. The method achieves the aim of improving the yield of the rare earth by controlling the numerical value of the active oxygen, and simultaneously effectively slows down the blockage of the continuous casting nozzle.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a production method of rare earth H08A-containing electrode steel.
Background
H08A welding rod steel is a common welding steel, mainly used for producing welding rods, the steel type is characterized by low carbon and low silicon, and because of the characteristics of the steel type, a deoxidizer is required to be added for deoxidation during steelmaking production, a large amount of aluminum-containing inclusions are produced, and thus a tundish nozzle is easy to block. The continuous casting water gap is blocked, so that the continuous casting pulling speed is forced to be reduced, the flow is lacked and even the casting is stopped, the production efficiency is influenced, the cost is increased, and more serious quality problems are caused.
The rare earth has a good improvement effect on the welding performance of the welding bar steel, can improve the corrosion resistance and low-temperature impact toughness of a welding line, but has strong oxidizability, is very easy to oxidize and consume when being added into steel-making production, has extremely low yield, and aggravates the blockage of a continuous casting nozzle.
Disclosure of Invention
The invention aims to provide a production method of rare earth-containing H08A electrode steel, which solves the technical problems in steel making control of rare earth and low-carbon and low-silicon steel.
In order to solve the technical problems, the invention adopts the following technical scheme:
a production method of rare earth-containing H08A electrode steel 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 active oxygen to be less than 50ppm, and supplementing an aluminum deoxidizer when the oxygen is high;
after LF refining is finished, adding iron calcium wire for calcium treatment to enable high-melting-point Al2O3Conversion to calcium aluminate with low melting point, improved castability, and effective prevention ofThe nozzle nodulation is carried out, and meanwhile, rare earth alloy is added, so that the soft blowing is ensured to be carried out for more than 8 minutes after refining, and the uniformity of the temperature of the ladle and the floating of fine impurities are ensured;
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 of the welding rod steel comprise, by mass: less than or equal to 0.08 percent of C, less than or equal to 0.03 percent of Si, 0.40 to 0.50 percent of Mn, 0.0010 to 0.020 percent of RE, and the balance of Fe and inevitable impurities, wherein P in the impurities is less than or equal to 0.020 percent, and S in the impurities is less than or equal to 0.020 percent.
Furthermore, the target active oxygen in the steel is 40-50 ppm.
Compared with the prior art, the invention has the beneficial technical effects that:
the yield of rare earth is improved, and the blockage of a continuous casting nozzle is effectively slowed down.
Detailed Description
The production method of the rare earth-containing H08A electrode steel in the embodiment comprises the following steps: 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. Normally blowing 1 gun of steel to discharge 0.04% of carbon, and supplementing 50kg of aluminum iron before discharging; blowing 1 gun of steel tapping carbon by normal point for 0.03 percent, and supplementing 80kg of aluminum iron before tapping; and (3) normally, 1 gun is blown to tap 0.02% of carbon, and 100kg of aluminum and iron are supplemented before tapping.
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 requirements of low carbon and low silicon of the finished product wire rod, the LF refining strictly controls the content of carbon and silicon, the content of carbon is controlled to be 0.05 percent, and the content of silicon is controlled to be 0.01 percent. 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 influences the yield of rare earth, when the active oxygen is less than 50ppm, the rare earth yield can be effectively ensured to be stabilized above 30%, and when the active oxygen is more than 50ppm, the rare earth yield is almost 0.
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 | 1620 | 0.05 | 0.011 |
| Example 2 | 1644 | 0.04 | 0.010 |
| Example 3 | 1633 | 0.03 | 0.020 |
| Example 4 | 1625 | 0.04 | 0.015 |
| Example 5 | 1640 | 0.04 | 0.018 |
TABLE 2 continuous casting Process parameters
TABLE 3 relationship between refining activity oxygen and rare earth yield
The oxygen content in steel directly influences the yield of rare earth, when the active oxygen is less than 50ppm, the rare earth yield can be effectively ensured to be stabilized above 30%, and when the active oxygen is more than 50ppm, the rare earth yield is almost 0.
TABLE 4 Final product composition (wt%, balance iron)
| C | Si | Mn | P | S | RE(ppm) | |
| Example 1 | 0.06 | 0.01 | 0.41 | 0.012 | 0.011 | 9 |
| Example 2 | 0.05 | 0.02 | 0.43 | 0.017 | 0.012 | 10 |
| Example 3 | 0.06 | 0.01 | 0.44 | 0.018 | 0.018 | 0.3 |
| Example 4 | 0.05 | 0.02 | 0.42 | 0.014 | 0.018 | 0 |
| Example 5 | 0.06 | 0.01 | 0.45 | 0.0160 | 0.019 | 0 |
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 (3)
1. The production method of the rare earth-containing H08A electrode steel 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 active oxygen to be less than 50ppm, and supplementing an aluminum deoxidizer when the oxygen is high;
after LF refining is finished, adding iron calcium wire for calcium treatment to enable high-melting-point Al2O3The 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 is ensured to be more than 8 minutes after refining, and the uniformity of the ladle temperature and the floating of fine impurities are ensured;
the continuous casting superheat degree is set to be 25-35 ℃, and the drawing speed is 1.9-2.2 m/min.
2. The method for producing the rare earth-containing H08A electrode steel as claimed in claim 1, wherein the chemical composition of the electrode steel comprises the following components by mass percent: less than or equal to 0.08 percent of C, less than or equal to 0.03 percent of Si, 0.40 to 0.50 percent of Mn, 0.0010 to 0.020 percent of RE, and the balance of Fe and inevitable impurities, wherein P in the impurities is less than or equal to 0.020 percent, and S in the impurities is less than or equal to 0.020 percent.
3. The method for producing steel with rare earth H08A welding rod according to claim 1, wherein the target of active oxygen control is 40-50 ppm.
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| CN202010910392.0A CN112342451A (en) | 2020-09-02 | 2020-09-02 | Production method of rare earth-containing H08A electrode steel |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113122767A (en) * | 2021-03-26 | 2021-07-16 | 江苏大学 | Rare earth steel production method for preventing continuous casting nozzle from nodulation |
| CN113943893A (en) * | 2021-09-22 | 2022-01-18 | 包头钢铁（集团）有限责任公司 | Production method of 700 MPa-grade rare earth-containing welding wire steel |
| CN113981305A (en) * | 2021-10-14 | 2022-01-28 | 包头钢铁（集团）有限责任公司 | Production method of titanium microalloyed 700 MPa-grade welding wire steel |
| CN114107593A (en) * | 2021-11-08 | 2022-03-01 | 包头钢铁（集团）有限责任公司 | Production method of 60 kg-grade welding wire steel |
| CN114507819A (en) * | 2022-01-28 | 2022-05-17 | 包头钢铁（集团）有限责任公司 | Production method of vehicle atmospheric corrosion resistant 500MPa grade welding wire steel |
| CN114908207A (en) * | 2022-04-18 | 2022-08-16 | 包头钢铁（集团）有限责任公司 | Method for improving rare earth yield by controlling sulfur content of molten steel |
| CN114990286A (en) * | 2022-05-11 | 2022-09-02 | 包头钢铁（集团）有限责任公司 | Method for reducing welding spatter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113122767A (en) * | 2021-03-26 | 2021-07-16 | 江苏大学 | Rare earth steel production method for preventing continuous casting nozzle from nodulation |
| CN113943893A (en) * | 2021-09-22 | 2022-01-18 | 包头钢铁（集团）有限责任公司 | Production method of 700 MPa-grade rare earth-containing welding wire steel |
| CN113981305A (en) * | 2021-10-14 | 2022-01-28 | 包头钢铁（集团）有限责任公司 | Production method of titanium microalloyed 700 MPa-grade welding wire steel |
| CN114107593A (en) * | 2021-11-08 | 2022-03-01 | 包头钢铁（集团）有限责任公司 | Production method of 60 kg-grade welding wire steel |
| CN114507819A (en) * | 2022-01-28 | 2022-05-17 | 包头钢铁（集团）有限责任公司 | Production method of vehicle atmospheric corrosion resistant 500MPa grade welding wire steel |
| CN114908207A (en) * | 2022-04-18 | 2022-08-16 | 包头钢铁（集团）有限责任公司 | Method for improving rare earth yield by controlling sulfur content of molten steel |
| CN114990286A (en) * | 2022-05-11 | 2022-09-02 | 包头钢铁（集团）有限责任公司 | Method for reducing welding spatter |
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