CN111218542A - Low argon blowing process of medium-frequency induction melting furnace - Google Patents
Low argon blowing process of medium-frequency induction melting furnace Download PDFInfo
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- CN111218542A CN111218542A CN201911365497.6A CN201911365497A CN111218542A CN 111218542 A CN111218542 A CN 111218542A CN 201911365497 A CN201911365497 A CN 201911365497A CN 111218542 A CN111218542 A CN 111218542A
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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
- C21C7/072—Treatment with gases
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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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5241—Manufacture of steel in electric furnaces in an inductively heated furnace
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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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- Organic Chemistry (AREA)
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a low argon blowing process of a medium-frequency induction melting furnace, which comprises the following steps: the method comprises the steps of furnace body transformation, gas supply preparation, raw material melting, argon supply, flow regulation, molten steel processing and product pouring. Compared with other treatment processes, the process is mature, argon is blown into the induction furnace from the bottom of the induction furnace through the round hole formed in the bottom of the shell of the medium-frequency melting furnace and the high-purity argon source is connected externally, impurities in molten steel slowly float up along with argon bubbles in the use process of the medium-frequency induction furnace, the impurities in the molten steel are reduced, the quality of the molten steel is improved, the purity of the produced molten steel is close to that of vacuum smelting molten steel, the smelting cost is greatly reduced, different high-end precision casting requirements are met, the use effect of an additive is improved, the rejection rate is reduced, the service life of a furnace lining is prolonged, the investment is low, a brand new refining function is endowed to the induction furnace, and powerful technical support is provided for improving the.
Description
Technical Field
The invention relates to an argon blowing process for metal processing, in particular to a low argon blowing process of a medium-frequency induction melting furnace.
Background
The induction furnace that the frequency is in 150 ~ 10000Hz within range is called medium frequency induction furnace, and medium frequency induction furnace is the special type smelting equipment who is applicable to smelting high-quality steel and alloy, and it is fast to have a melting speed, production efficiency is high, strong adaptability, use nimble, the electromagnetic stirring is effectual, start convenient operation, molten steel are covered by the slag, reduce advantages such as atmosphere to molten steel pollution, and medium frequency induction furnace's complete sets includes: a power supply and electric appliance control part, a furnace body part, a transmission device and a water cooling system.
The existing intermediate frequency induction melting furnace only has a basic melting function, and after the refined master batch is melted by the intermediate frequency induction furnace, molten steel is contacted with oxygen in the air, so that oxide inclusions are easily generated, the molten steel is polluted again, the purity of the molten steel is insufficient, and the product quality is influenced. Therefore, a low argon blowing process of the medium-frequency induction melting furnace is provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a low argon blowing process of a medium-frequency induction melting furnace, which has a mature process, wherein through a round hole formed at the bottom of a shell of the medium-frequency melting furnace and externally connected with a high-purity argon gas source, argon gas is blown into the induction furnace from the bottom of the induction furnace in the using process of the medium-frequency induction furnace, so that inclusions in molten steel slowly float up along with argon bubbles, the inclusions in the molten steel are reduced, the quality of the molten steel is improved, the purity of the produced molten steel is close to that of the molten steel smelted in vacuum, the smelting cost is greatly reduced, different high-end precision casting requirements are met, the use effect of an additive is improved, the rejection rate is reduced, the service life of a furnace lining is prolonged, the investment is low, a brand new refining function is endowed to the induction furnace, and.
In order to achieve the purpose, the invention provides the following technical scheme: a low argon blowing process of a medium-frequency induction melting furnace comprises the following steps:
s1, furnace body modification: processing a round hole in the center of the bottom of the intermediate frequency induction furnace shell and installing a gas diffuser;
s2, preparation of air supply: preparing an argon gas source, sequentially connecting a pressure gauge, a flow meter and a needle valve at an outlet of the gas source, and connecting the gas source with a gas diffuser;
s3, melting the raw materials: selecting returned raw materials, directly putting the raw materials into a medium-frequency melting furnace for melting, and adjusting to obtain qualified molten steel according to chemical component requirements;
s4, argon supply: after the molten steel in the smelting furnace is fully melted, gradually opening the needle valve to enable an argon gas source to be conveyed to the interior of the medium-frequency induction furnace through the gas diffuser;
s5, flow regulation: the flow of the gas is manually observed and adjusted, so that the liquid level of the steel is ensured to have bubble spots, and secondary oxidation and slag entrapment caused by the fact that the molten steel is exposed to air due to the fact that the gas flow is too large and the molten steel rolls over are avoided;
s6, molten steel processing: blowing for more than a period of time under the conditions of certain argon supply pressure and flow, and then adding lime for slagging to obtain qualified molten steel;
s7, pouring a product: the high-purity qualified molten steel is cast into a product, and various high-end production requirements are met.
Preferably, the diameter of the round hole processed on the shell of the medium frequency induction furnace is 18 mm.
Preferably, the purity of the argon source gas is 99.99%.
Preferably, the range of the pressure meter is 0-9 Mpa, and the range of the flow meter is 0-250L/min.
Preferably, the argon supply pressure is 3Mpa, the argon flow is 150L/min, and the continuous air supply time is more than 30min during molten steel processing.
The invention has the technical effects and advantages that:
the invention has mature and mature process, the circular hole arranged at the bottom of the shell of the medium-frequency melting furnace is externally connected with a high-purity argon gas source, argon gas is blown into the induction furnace from the bottom of the induction furnace in the using process of the medium-frequency induction furnace, inclusions in molten steel are promoted to slowly float upwards along with argon bubbles, the inclusions in the molten steel are reduced, the quality of the molten steel is improved, the purity of the produced molten steel is close to the purity of the molten steel smelted in vacuum, the smelting cost is greatly reduced, different high-end precision casting requirements are met, the use effect of an additive is improved, the rejection rate is reduced, the service life of a furnace lining is prolonged, the investment is low, a brand new refining function is endowed to the induction furnace, and powerful.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A low argon blowing process of a medium-frequency induction melting furnace comprises the following steps:
s1, furnace body modification: processing a round hole in the center of the bottom of the intermediate frequency induction furnace shell and installing a gas diffuser;
s2, preparation of air supply: preparing an argon gas source, sequentially connecting a pressure gauge, a flow meter and a needle valve at an outlet of the gas source, and connecting the gas source with a gas diffuser;
s3, melting the raw materials: selecting returned raw materials, directly putting the raw materials into a medium-frequency melting furnace for melting, and adjusting to obtain qualified molten steel according to chemical component requirements;
s4, argon supply: after the molten steel in the smelting furnace is fully melted, gradually opening the needle valve to enable an argon gas source to be conveyed to the interior of the medium-frequency induction furnace through the gas diffuser;
s5, flow regulation: the flow of the gas is manually observed and adjusted, so that the liquid level of the steel is ensured to have bubble spots, and secondary oxidation and slag entrapment caused by the fact that the molten steel is exposed to air due to the fact that the gas flow is too large and the molten steel rolls over are avoided;
s6, molten steel processing: blowing for more than a period of time under the conditions of certain argon supply pressure and flow, and then adding lime for slagging to obtain qualified molten steel;
s7, pouring a product: the high-purity qualified molten steel is cast into a product, and various high-end production requirements are met.
Preferably, the diameter of the round hole processed on the shell of the medium frequency induction furnace is 18 mm.
Preferably, the purity of the argon source gas is 99.99%.
Preferably, the range of the pressure meter is 0-9 Mpa, and the range of the flow meter is 0-250L/min.
Preferably, the argon supply pressure is 3Mpa, the argon flow is 150L/min, and the continuous air supply time is more than 30min during molten steel processing.
In summary, the following steps: compared with other treatment processes, the low argon blowing process of the medium-frequency induction melting furnace provided by the invention has the following advantages: the process is mature, through the round hole arranged at the bottom of the shell of the medium-frequency melting furnace and externally connected with a high-purity argon gas source, argon gas is blown into the induction furnace from the bottom of the induction furnace in the use process of the medium-frequency induction furnace, inclusions in molten steel are enabled to slowly float up along with argon bubbles, the inclusions in the molten steel are reduced, the quality of the molten steel is improved, the purity of the produced molten steel is enabled to be close to the purity of the molten steel of vacuum smelting, the smelting cost is greatly reduced, different high-end precision casting requirements are met, the use effect of an additive is improved, the rejection rate is reduced, the service life of a furnace lining is prolonged, the investment is low, a brand new refining function is endowed to the.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (5)
1. A low argon blowing process of a medium-frequency induction melting furnace is characterized in that: the method comprises the following steps:
s1, furnace body modification: processing a round hole in the center of the bottom of the intermediate frequency induction furnace shell and installing a gas diffuser;
s2, preparation of air supply: preparing an argon gas source, sequentially connecting a pressure gauge, a flow meter and a needle valve at an outlet of the gas source, and connecting the gas source with a gas diffuser;
s3, melting the raw materials: selecting returned raw materials, directly putting the raw materials into a medium-frequency melting furnace for melting, and adjusting to obtain qualified molten steel according to chemical component requirements;
s4, argon supply: after the molten steel in the smelting furnace is fully melted, gradually opening the needle valve to enable an argon gas source to be conveyed to the interior of the medium-frequency induction furnace through the gas diffuser;
s5, flow regulation: the flow of the gas is manually observed and adjusted, so that the liquid level of the steel is ensured to have bubble spots, and secondary oxidation and slag entrapment caused by the fact that the molten steel is exposed to air due to the fact that the gas flow is too large and the molten steel rolls over are avoided;
s6, molten steel processing: blowing for more than a period of time under the conditions of certain argon supply pressure and flow, and then adding lime for slagging to obtain qualified molten steel;
s7, pouring a product: the high-purity qualified molten steel is cast into a product, and various high-end production requirements are met.
2. The low argon blowing process of the medium-frequency induction melting furnace as claimed in claim 1, characterized in that: the diameter of a round hole processed on the shell of the medium-frequency induction furnace is 18 mm.
3. The low argon blowing process of the medium-frequency induction melting furnace as claimed in claim 1, characterized in that: the purity of the argon source is 99.99%.
4. The low argon blowing process of the medium-frequency induction melting furnace as claimed in claim 1, characterized in that: the range of the pressure meter is 0-9 Mpa, and the range of the flow meter is 0-250L/min.
5. The low argon blowing process of the medium-frequency induction melting furnace as claimed in claim 1, characterized in that: the argon supply pressure is 3Mpa, the argon flow is 150L/min, and the gas supply duration is more than 30 min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911365497.6A CN111218542A (en) | 2019-12-26 | 2019-12-26 | Low argon blowing process of medium-frequency induction melting furnace |
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| CN201911365497.6A CN111218542A (en) | 2019-12-26 | 2019-12-26 | Low argon blowing process of medium-frequency induction melting furnace |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08246026A (en) * | 1995-03-06 | 1996-09-24 | Nkk Corp | Method for controlling form of inclusion in molten steel |
| CN101067179A (en) * | 2007-06-07 | 2007-11-07 | 泰州金鼎精密铸造有限公司 | Bottom blowing type intermediate frequency smelting furnace and in-furnace auxiliary refining method |
| CN102010936A (en) * | 2010-04-22 | 2011-04-13 | 广西钟山长城矿山机械厂 | Process method for refining austenitic manganese steel by blowing argon gas into medium frequency induction furnace |
| CN108530091A (en) * | 2018-05-18 | 2018-09-14 | 广西长城机械股份有限公司 | It is a kind of to utilize medium-frequency induction furnace made of improvement air brick |
| CN108660290A (en) * | 2017-03-29 | 2018-10-16 | 鞍钢股份有限公司 | A kind of compound ar blowing refining device and method in Medium frequency induction furnace roof bottom |
-
2019
- 2019-12-26 CN CN201911365497.6A patent/CN111218542A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08246026A (en) * | 1995-03-06 | 1996-09-24 | Nkk Corp | Method for controlling form of inclusion in molten steel |
| CN101067179A (en) * | 2007-06-07 | 2007-11-07 | 泰州金鼎精密铸造有限公司 | Bottom blowing type intermediate frequency smelting furnace and in-furnace auxiliary refining method |
| CN102010936A (en) * | 2010-04-22 | 2011-04-13 | 广西钟山长城矿山机械厂 | Process method for refining austenitic manganese steel by blowing argon gas into medium frequency induction furnace |
| CN108660290A (en) * | 2017-03-29 | 2018-10-16 | 鞍钢股份有限公司 | A kind of compound ar blowing refining device and method in Medium frequency induction furnace roof bottom |
| CN108530091A (en) * | 2018-05-18 | 2018-09-14 | 广西长城机械股份有限公司 | It is a kind of to utilize medium-frequency induction furnace made of improvement air brick |
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