CN112391571A - Control method for cleanliness of high-strength high-aluminum high-manganese steel - Google Patents
Control method for cleanliness of high-strength high-aluminum high-manganese steel Download PDFInfo
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- CN112391571A CN112391571A CN202011337770.7A CN202011337770A CN112391571A CN 112391571 A CN112391571 A CN 112391571A CN 202011337770 A CN202011337770 A CN 202011337770A CN 112391571 A CN112391571 A CN 112391571A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C21C7/076—Use of slags or fluxes as treating agents
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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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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for controlling cleanliness of high-strength high-aluminum high-manganese steel, which comprises the following steps: adding molten iron into the converter; when tapping is carried out by the converter, the mass percentage content of the manganese element is reduced by 0.2 percent according to the target lower limit, and the carbon element is firstly used for deoxidation in the tapping process; the mass percentage of the aluminum element in the LF refining process is controlled according to 0.45-0.55%, and the mass percentage of the manganese element is controlled according to 1.8 +/-0.1%. The control method provided by the invention can effectively ensure the cleanliness of steel grades represented by high-strength high-aluminum high-manganese by controlling the converter end point, the primary hit of LF refining and the mass percentages of manganese elements and aluminum elements.
Description
Technical Field
The invention relates to the field of molten steel smelting, in particular to a control method for cleanliness of high-strength high-aluminum high-manganese steel.
Background
The high-strength high-aluminum high-manganese steel refers to steel with the AlS content of 0.5-0.6% and the Mn content of 1.7-19%. Because the steel has high aluminum content and is easy to oxidize, high manganese production is difficult to hit at one time, the problems of poor molten steel quality and poor cleanliness, the casting of the whole first furnace cannot be completed during production and the like are easily caused.
Therefore, how to effectively improve the cleanliness of the high-strength high-aluminum high-manganese steel is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a control method of cleanliness of high-strength high-aluminum high-manganese steel, which is used for reducing molten steel inclusions and improving the cleanliness.
In order to achieve the purpose, the invention provides the following technical scheme:
a control method for cleanliness of high-strength high-aluminum high-manganese steel comprises the following steps:
adding molten iron into the converter;
when tapping is carried out by the converter, the mass percentage content of the manganese element is reduced by 0.2 percent according to the target lower limit, and the carbon element is firstly used for deoxidation in the tapping process;
the mass percentage of the aluminum element in the LF refining process is controlled according to 0.45-0.55%, and the mass percentage of the manganese element is controlled according to 1.8 +/-0.1%.
Preferably, the method further comprises the following steps:
in the continuous casting process, a calcium aluminate covering agent and low-carbon aluminum killed steel casting powder are added.
Preferably, after tapping from the converter and before entering the tundish, the method further comprises the following steps:
when the tundish is poured for the first time, molten steel Q235B is poured, and a preset weight of steel slag is reserved at the end of pouring of the molten steel Q235B.
Preferably, the molten steel Q235B poured in the tundish for the first time is completely deoxidized in the refining process, the control target of the mass percentage content of AlS in the molten steel Q235B is 0.01-0.02%, and the control target of the mass percentage content of S elements at the outlet is less than or equal to 0.005%.
Preferably, the predetermined weight is 5 to 10 tons.
Preferably, the method further comprises the following steps:
during converter tapping, quantitatively adding aluminum with target weight at last in alloying; the calculation method of the target weight comprises the following steps: the molten steel amount is multiplied by 0.5 percent multiplied by the aluminum content of the aluminum alloy and multiplied by the yield of the aluminum alloy.
Preferably, before the molten iron is added into the converter, the method further comprises the following steps:
and cleaning the converter, the ladle pot and the vacuum chamber by adopting low-sulfur molten steel.
The invention provides a control method of cleanliness of high-strength high-aluminum high-manganese steel, which comprises the following steps: adding molten iron into the converter; when tapping is carried out by the converter, the mass percentage content of the manganese element is reduced by 0.2 percent according to the target lower limit, and the carbon element is firstly used for deoxidation in the tapping process; the mass percentage of the aluminum element in the LF refining process is controlled according to 0.45-0.55%, and the mass percentage of the manganese element is controlled according to 1.8 +/-0.1%. The control method provided by the invention can effectively ensure the cleanliness of steel grades represented by high-strength high-aluminum high-manganese by controlling the converter end point, the primary hit of LF refining and the mass percentages of manganese elements and aluminum elements.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a specific embodiment of the method for controlling cleanliness of high-strength, high-aluminum and high-manganese steel provided by the invention.
Detailed Description
The core of the invention is to provide a control method of cleanliness of high-strength high-aluminum high-manganese steel, which is used for reducing molten steel inclusions and improving the cleanliness.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for controlling cleanliness of high-strength, high-aluminum and high-manganese steel according to an embodiment of the present invention.
In the embodiment, the method for controlling the cleanliness of the high-strength high-aluminum high-manganese steel comprises the following steps:
step S1: adding molten iron into the converter;
step S2: when tapping is carried out by the converter, the mass percentage content of the manganese element is reduced by 0.2 percent according to the target lower limit, and the carbon element is firstly used for deoxidation in the tapping process; specifically, the target lower limit of the mass percentage content of the manganese element should be the lowest value of the mass percentage content of the manganese element corresponding to the steel grade;
step S3: the mass percentage of the aluminum element in the LF refining process is controlled according to 0.45-0.55%, and the mass percentage of the manganese element is controlled according to 1.8 +/-0.1%.
Further, the method also comprises the following steps:
in the continuous casting process, a calcium aluminate covering agent and low-carbon aluminum killed steel casting powder are added. After the converter steel tapping enters a steel ladle and a tundish and enters a crystallizer for continuous casting, a calcium aluminate covering agent is added to reduce the content of harmful elements and impurities in the steel. Meanwhile, the low-carbon aluminum killed steel casting powder is used to improve the cleanliness of the high-strength high-aluminum high-manganese steel.
In addition to the above embodiments, the present invention further includes, after tapping from the converter and before entering the tundish:
when the tundish is poured for the first time, molten steel Q235B is poured, and a preset weight of steel slag is reserved at the end of pouring of the molten steel Q235B. Before the high-strength high-aluminum high-manganese steel molten steel is formally cast, the Q235B molten steel with lower performance requirement is firstly used for casting the tundish, thereby reducing the refractory impurities in the tundish and further improving the cleanliness of the high-strength high-aluminum high-manganese steel molten steel.
Further, the preset weight is 5-10 tons, namely 5-10 tons of steel slag are reserved in the ladle at the end of the casting heat of the molten steel Q235B. In the steps, 5-10 tons of steel slag are reserved to mainly prevent the Q235B molten steel from slag falling, and the purity in the tundish and the crystallizer is guaranteed.
On the basis of the above embodiments, the molten steel of Q235B poured for the first time is poured into the tundish, and the refining process is performed such that the control target of the mass percentage content of AlS in the molten steel of Q235B is 0.01% -0.02%, and the control target of the mass percentage content of S elements out of the tundish is not more than 0.005%.
In addition to the above embodiments, the method further includes:
during converter tapping, quantitatively adding aluminum with target weight at last in alloying; the calculation method of the target weight comprises the following steps: the molten steel amount is multiplied by 0.5 percent multiplied by the aluminum content of the aluminum alloy and multiplied by the yield of the aluminum alloy. Wherein the yield of the aluminum alloy refers to the ratio of the final obtained amount of the aluminum alloy to the initial input amount in unit time.
In addition to the above embodiments, before adding molten iron into the converter, the method further includes:
and cleaning the converter, the ladle pot and the vacuum chamber by adopting low-sulfur molten steel. Above-mentioned cleaning process can effectively get rid of the dregs in converter, ladle jar and the vacuum chamber, reduces in the high-strength high aluminium high manganese steel smelting process, the influence of dregs to the molten iron.
According to the control method for the cleanliness of the high-strength high-aluminum high-manganese steel, the converter end point is controlled, the manganese element and the aluminum element of the converter are alloyed and refined in an LF (ladle furnace) mode at one time, the Mn is added according to the lower limit of 0.2% of the target in the converter tapping process, the C element is used for deoxidation in the tapping process, the aluminum is quantitatively added in the alloying process, for example, 1000kg is obtained, the aluminum in the LF refining process is controlled according to 0.45-0.55%, and the Mn is controlled according to 1.8 +/-0.1%. And finally, adopting a calcium aluminate covering agent and low-carbon aluminum killed steel casting powder in the continuous casting process. The technical improvement or the process invention can solve the problem of maintaining the cleanliness represented by high strength, high aluminum and high manganese, and can be widely applied to production.
The control method for the cleanliness of the high-strength high-aluminum high-manganese steel provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (7)
1. A control method for cleanliness of high-strength high-aluminum high-manganese steel is characterized by comprising the following steps:
adding molten iron into the converter;
when tapping is carried out by the converter, the mass percentage content of the manganese element is reduced by 0.2 percent according to the target lower limit, and the carbon element is firstly used for deoxidation in the tapping process;
the mass percentage of the aluminum element in the LF refining process is controlled according to 0.45-0.55%, and the mass percentage of the manganese element is controlled according to 1.8 +/-0.1%.
2. The method for controlling the cleanliness of the high-strength high-aluminum high-manganese steel according to claim 1, further comprising the steps of:
in the continuous casting process, a calcium aluminate covering agent and low-carbon aluminum killed steel casting powder are added.
3. The method for controlling the cleanliness of the high-strength high-aluminum high-manganese steel according to claim 1, wherein after tapping from the converter and before entering the tundish, the method further comprises:
when the tundish is poured for the first time, molten steel Q235B is poured, and a preset weight of steel slag is reserved at the end of pouring of the molten steel Q235B.
4. The method for controlling the cleanliness of a high-strength high-aluminum high-manganese steel according to claim 3, wherein the molten steel Q235B poured for the first time is poured in a tundish, the refining process is completely deoxidized, the control target of the mass percentage content of AlS in the molten steel Q235B is 0.01% -0.02%, and the control target of the mass percentage content of S elements out of a station is less than or equal to 0.005%.
5. The method for controlling cleanliness of a high-strength, high-aluminum, high-manganese steel according to claim 3, wherein the predetermined weight is 5 to 10 tons.
6. The method for controlling the cleanliness of the high-strength high-aluminum high-manganese steel according to any one of claims 1 to 5, further comprising the steps of:
during converter tapping, quantitatively adding aluminum with target weight at last in alloying; the calculation method of the target weight comprises the following steps: the molten steel amount is multiplied by 0.5 percent multiplied by the aluminum content of the aluminum alloy and multiplied by the yield of the aluminum alloy.
7. The method for controlling the cleanliness of the high-strength high-aluminum high-manganese steel according to any one of claims 1 to 5, wherein before the molten iron is added into the converter, the method further comprises the following steps:
and cleaning the converter, the ladle pot and the vacuum chamber by adopting low-sulfur molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011337770.7A CN112391571A (en) | 2020-11-25 | 2020-11-25 | Control method for cleanliness of high-strength high-aluminum high-manganese steel |
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| CN202011337770.7A CN112391571A (en) | 2020-11-25 | 2020-11-25 | Control method for cleanliness of high-strength high-aluminum high-manganese steel |
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Citations (10)
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|---|---|---|---|---|
| US20080164003A1 (en) * | 2005-03-05 | 2008-07-10 | Jens Kempken | Method and Installation for Producing Light Gauge Steel with a High Manganese Content |
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| CN111408698A (en) * | 2020-05-06 | 2020-07-14 | 攀钢集团西昌钢钒有限公司 | Control method for surface quality of high-strength high-aluminum high-vanadium steel casting blank |
| CN111455131A (en) * | 2020-05-29 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting and continuous casting method of high-cleanliness wear-resistant steel |
-
2020
- 2020-11-25 CN CN202011337770.7A patent/CN112391571A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080164003A1 (en) * | 2005-03-05 | 2008-07-10 | Jens Kempken | Method and Installation for Producing Light Gauge Steel with a High Manganese Content |
| CN103468866A (en) * | 2013-09-26 | 2013-12-25 | 攀钢集团攀枝花钢钒有限公司 | Refining technology for molten medium-high carbon steel |
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