CN112593036A - Low-silicon microalloyed high-temperature carburized gear steel and manufacturing method thereof - Google Patents
Low-silicon microalloyed high-temperature carburized gear steel and manufacturing method thereof Download PDFInfo
- Publication number
- CN112593036A CN112593036A CN202011377758.9A CN202011377758A CN112593036A CN 112593036 A CN112593036 A CN 112593036A CN 202011377758 A CN202011377758 A CN 202011377758A CN 112593036 A CN112593036 A CN 112593036A
- Authority
- CN
- China
- Prior art keywords
- steel
- temperature
- slag
- tapping
- equal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
-
- 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
- C21C7/10—Handling in a vacuum
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
Abstract
The invention discloses a low-silicon microalloyed high-temperature carburized gear steel and a manufacturing method thereof, wherein about 20 percent of scrap steel is added into a converter, then molten iron is added for smelting, and a control target of end point steel tapping is as follows: c is more than or equal to 0.08 percent, P is less than or equal to 0.015 percent, and the sliding plate slag stopping operation is carried out in the tapping process to reduce the slag; alloying is started about 90 seconds after tapping is started, and the adding sequence is as follows: ferro-aluminium-carbon powder-alloy-lime. The low-silicon microalloying high-temperature carburized gear steel and the manufacturing method thereof greatly reduce the enrichment of impurities on the inner side of a water gap, realize the stable state control of a stopper rod curve in the casting process, prevent the stopper rod curve from being involved in large-size impurities due to sudden fluctuation, realize at least 6-furnace continuous casting production, obviously prolong the service life of the gear, prevent the abnormal growth of austenite grains, improve the austenite grain coarsening temperature of the gear steel, and further achieve the effect of preventing the mixed crystals and coarse grains of the austenite grains of the gear steel after the high carburization temperature.
Description
Technical Field
The invention relates to the technical field of special steel, in particular to low-silicon microalloyed high-temperature carburized gear steel and a manufacturing method thereof.
Background
With the increasing environmental pollution and energy exhaustion, the high-temperature vacuum carburization technology with environmental protection, energy conservation, high performance and high efficiency becomes the main direction of the development and application of the international heat treatment technology in recent years. At present, the gas carburizing temperature commonly used at home and abroad is generally not higher than 930 ℃, and the high-temperature vacuum carburizing temperature can be 980 ℃ or even more than 1000 ℃ because the processing environment is oxygen-free. According to the calculation of the carburizing principle, the carburizing temperature is improved by about 53 ℃, and the carburizing time can be shortened by about 50%. Therefore, if the carburizing temperature is increased to 980 ℃, the carburizing time can be shortened to 50% of the original carburizing time. The high temperature vacuum carburization technique is becoming a necessary alternative to the gas carburization technique with its own advantages.
Starting in the nineties of the twentieth century, high temperature vacuum carburization technology began to find industrial application in europe and japan. However, only a few domestic automobile part production enterprises introduce high-temperature vacuum carburizing complete equipment so far, and the equipment is used as common carburizing equipment due to the lack of matched gear steel for high-temperature vacuum carburizing, so that the waste of enterprise and social resources is caused. Therefore, the development and research of the high-temperature vacuum carburized gear steel are urgent.
The main technical problem of the high-temperature vacuum carburized gear steel is that austenite grains of the gear steel have the phenomena of mixed grains and coarse grains after the carburization temperature is increased, so that the strength and the precision of the gear are influenced, and the gear cannot be used and is scrapped. In order to ensure the performance requirement of the high-temperature vacuum carburized gear, the austenite grain size is generally required to be 5.0-8.0 grade. In order to obtain the required grain size, the method generally adopted by people is to control the content of Al and N, or add elements such as Nb, Ti, V and the like to form carbon and nitrogen compound particles of Al, Nb, Ti and V to pin the austenite grain boundary of the steel, so as to prevent the austenite grain from growing abnormally in the heating process, thereby improving the coarsening temperature of the austenite grain of the gear steel, and ensuring that the structure and the performance of the gear after high-temperature vacuum carburization meet the use requirements of the gear.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides low-silicon microalloyed high-temperature carburized gear steel and a manufacturing method thereof, and solves the problems of mixed grains and coarse grains of austenite grains of the gear steel after the high carburization temperature.
In order to achieve the purpose, the invention provides the following technical scheme: a low-silicon microalloyed high-temperature carburized gear steel and a manufacturing method thereof, the method comprises the following steps:
the first step is as follows: smelting in a converter
Adding about 20% of scrap steel into a converter, then adding molten iron for smelting, and tapping at the end point: c is more than or equal to 0.08 percent, P is less than or equal to 0.015 percent, and the sliding plate slag stopping operation is carried out in the tapping process to reduce the slag; alloying is started about 90 seconds after tapping is started, and the adding sequence is as follows: ferro-aluminium-carbon powder-alloy-lime.
The second step is that: refining in LF ladle furnace
Controlling the alkalinity of the slag to be 2.0-3.0, and simultaneously controlling the flow of Ar gas well to prevent slag entrapment caused by severe rolling of molten steel; comprehensive deoxidation is carried out by adopting a slag surface composite deoxidizer and silicon carbide diffusion deoxidation, the dosage of the slag surface composite deoxidizer is more than or equal to 150kg, and more than or equal to 80kg of silicon carbide and a small amount of ferrosilicon powder are added in the middle and later stages of smelting to maintain the slag.
The third step: RH vacuum degassing
After the molten steel is treated for 5min in vacuum, ferrotitanium is added for nitrogen fixation, the vacuum degree is kept below 0.266kPa for more than or equal to 18min, which is beneficial to reducing large-particle inclusions; in order to ensure that nitrogen is stable and controllable, nitrogen is increased by blowing nitrogen in the whole process in vacuum treatment, and nitrogen is increased by feeding a nitrogen-chromium line after the vacuum treatment is finished; after the vacuum treatment is finished, the calcium treatment is forbidden to prevent the formation of Ca and Al composite inclusions from blocking a water gap; after vacuum treatment, hoisting the ladle to a soft argon blowing station for soft argon blowing operation, keeping argon blowing for more than 20min to promote floating, gathering and removing of impurities, and strictly keeping molten steel bare on the premise that the slag surface is not blown broken and slightly fluctuated by the soft argon blowing flow.
The fourth step: continuous casting
In the continuous casting process, measures such as argon sealing of a large ladle long nozzle, immersion of a middle ladle nozzle, covering agent of a middle ladle, mold covering slag and the like are used for carrying out whole-process protective pouring on molten steel, the pouring temperature of a middle ladle is controlled to be 1533 +/-10 ℃, pouring is carried out at a constant pulling speed, and meanwhile, technological measures such as electromagnetic stirring of a crystallizer, weak cooling of secondary cooling water and the like are adopted to improve the internal quality of a casting blank. In order to prevent the casting blank from generating micro cracks, the casting blank is hung into a slow cooling pit for high-temperature slow cooling after being cut, and the surface temperature of the cast blank in the pit is ensured to be more than or equal to 610 ℃.
The fifth step: heating and rolling the casting blank into round steel
A round steel sample simulation carburizing and quenching process comprises the following steps: carburizing is carried out by keeping the temperature at 1010 ℃ for two hours, carburizing is carried out by keeping the temperature at 1020 ℃ for four hours, carburizing is carried out by keeping the temperature at 1030 ℃ for six hours, and then quenching is carried out at 860 ℃ and tempering is carried out at 200 ℃.
Preferably, when the converter taps steel, the kinetic energy of stirring during tapping is utilized, and a proper amount of lime is added to perform slag washing to pre-make reducing slag, so that the alkalinity is ensured, and rephosphorization and silicon return are prevented; the components and the temperature are stirred evenly in a soft way in the whole tapping process; steel core aluminum is adopted for molten steel deoxidation; according to the slag amount (generally about 5 kg/t), adding a proper amount of modifier in time after tapping; high carbon manganese is used for alloying.
Preferably, the stopper rod curve of the continuous casting process is strictly controlled in the continuous casting process, and the steady state control of the stopper rod curve of the casting process is kept.
Preferably, the converter generates a large amount of brown flue gas in the steel making process, and the main components of the brown flue gas are iron oxide dust particles, high-concentration carbon monoxide gas and the like, so that the brown flue gas must be purified and recycled to prevent environmental pollution. The iron oxide dust particles obtained from the recovery equipment can be used for steelmaking; carbon monoxide can be used as a chemical raw material or a fuel; the heat brought out by the flue gas can be used for generating steam as a byproduct.
Preferably, during the RH vacuum degassing, too little amount of molten steel will cause the temperature to drop too quickly for processing purposes. The general capacity of the ladle is more than or equal to 30 t. When the molten steel capacity is large, the thermal stability is good, the treatment can be carried out leisurely, and a good treatment result is achieved.
Preferably, in the converter smelting process, the adding amount of the aluminum-iron alloy is controlled to be 80 +/-20 kg, and the tapping temperature is ensured to be more than or equal to 1610 ℃.
The beneficial effects are as follows:
(1) the low-silicon microalloyed high-temperature carburized gear steel and the manufacturing method thereof reduce the Al content by controlling the content of Al and N elements, then reduce the forming quantity of Al2O3 brittle inclusions by combining the effective control of smelting low oxygen content, adopt the treatment of strictly prohibiting calcium after vacuum, prolong the soft argon blowing time to promote the floating and removal of large-size inclusions, greatly reduce the enrichment of the inclusions at the inner side of a water gap, realize the steady-state control of a stopper rod curve in the casting process, prevent the stopper rod curve from being involved in the large-size inclusions due to sudden fluctuation, realize at least 6-furnace continuous casting production, obviously improve the service fatigue life of a gear, prevent the abnormal growth of austenite grains, and improve the coarsening temperature of the austenite grains of the gear steel, thereby achieving the effect of preventing the mixed crystals and the coarse grains of the austenite grains of the gear steel after the high carburization temperature.
(2) According to the low-silicon microalloyed high-temperature carburized gear steel and the manufacturing method thereof, impurities in steel are avoided by strictly controlling the content of microalloy elements, the stable production quality of the steel is ensured, and the production cost of the steel is reduced.
Detailed Description
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.
The invention provides a technical scheme that: a low-silicon microalloyed high-temperature carburized gear steel and a manufacturing method thereof comprise the following steps:
the first step is as follows: smelting in a converter
Adding about 20% of scrap steel into a converter, then adding molten iron for smelting, and tapping at the end point: c is more than or equal to 0.08 percent, P is less than or equal to 0.015 percent, and the sliding plate slag stopping operation is carried out in the tapping process to reduce the slag; alloying is started about 90 seconds after tapping is started, and the adding sequence is as follows: the method comprises the following steps of (1) controlling the adding amount of aluminum-iron, carbon powder, alloy and lime in a converter smelting process to be 80 +/-20 kg, ensuring that the tapping temperature is more than or equal to 1610 ℃, adding a proper amount of lime to carry out slag washing to pre-manufacture reducing slag by utilizing stirring kinetic energy during tapping when the converter taps, ensuring the alkalinity, and preventing rephosphorization and silicon return; the components and the temperature are stirred evenly in a soft way in the whole tapping process; steel core aluminum is adopted for molten steel deoxidation; according to the slag amount (generally about 5 kg/t), adding a proper amount of modifier in time after tapping; high carbon manganese is used for alloying.
The second step is that: refining in LF ladle furnace
Controlling the alkalinity of the slag to be 2.0-3.0, and simultaneously controlling the flow of Ar gas well to prevent slag entrapment caused by severe rolling of molten steel; comprehensive deoxidation is carried out by adopting a slag surface composite deoxidizer and silicon carbide diffusion deoxidation, the dosage of the slag surface composite deoxidizer is more than or equal to 150kg, and more than or equal to 80kg of silicon carbide and a small amount of ferrosilicon powder are added in the middle and later stages of smelting to maintain the slag. In the process of steel making, a converter generates a large amount of brown flue gas, the main components of which are iron oxide dust particles, high-concentration carbon monoxide gas and the like, so that the brown flue gas needs to be purified, recovered and comprehensively utilized to prevent environmental pollution. The iron oxide dust particles obtained from the recovery equipment can be used for steelmaking; carbon monoxide can be used as a chemical raw material or a fuel; the heat brought out by the flue gas can be used for generating steam as a byproduct.
The third step: RH vacuum degassing
After the molten steel is treated for 5min in vacuum, ferrotitanium is added for nitrogen fixation, the vacuum degree is kept below 0.266kPa for more than or equal to 18min, which is beneficial to reducing large-particle inclusions; in order to ensure that nitrogen is stable and controllable, nitrogen is increased by blowing nitrogen in the whole process in vacuum treatment, and nitrogen is increased by feeding a nitrogen-chromium line after the vacuum treatment is finished; after the vacuum treatment is finished, the calcium treatment is forbidden to prevent the formation of Ca and Al composite inclusions from blocking a water gap; after vacuum treatment, the ladle is lifted to a soft argon blowing station for soft argon blowing operation, argon blowing is kept for more than 20min to promote floating, gathering and removing of impurities, the soft argon blowing flow is subject to slight fluctuation of the slag surface without breaking the slag surface, molten steel is strictly forbidden to be exposed, and in the RH vacuum degassing process, the temperature is reduced too fast due to the excessively small molten steel amount, so that the treatment purpose cannot be achieved. The general capacity of the ladle is more than or equal to 30 t. When the molten steel capacity is large, the thermal stability is good, the treatment can be carried out leisurely, and a good treatment result is achieved.
The fourth step: continuous casting
In the continuous casting process, measures such as argon sealing of a large ladle long nozzle, immersion of a middle ladle nozzle, covering agent of a middle ladle, mold covering slag and the like are used for carrying out whole-process protective pouring on molten steel, the pouring temperature of a middle ladle is controlled to be 1533 +/-10 ℃, pouring is carried out at a constant pulling speed, and meanwhile, technological measures such as electromagnetic stirring of a crystallizer, weak cooling of secondary cooling water and the like are adopted to improve the internal quality of a casting blank. In order to prevent the casting blank from generating microcracks, the casting blank is hoisted into a slow cooling pit for high-temperature slow cooling after being cut, the surface temperature of the pit is required to be ensured to be more than or equal to 610 ℃, the stopper rod curve in the continuous casting process is strictly controlled in the continuous casting process, and the stable control of the stopper rod curve in the casting process is kept.
The fifth step: heating and rolling the casting blank into round steel
A round steel sample simulation carburizing and quenching process comprises the following steps: carburizing is carried out by keeping the temperature at 1010 ℃ for two hours, carburizing is carried out by keeping the temperature at 1020 ℃ for four hours, carburizing is carried out by keeping the temperature at 1030 ℃ for six hours, and then quenching is carried out at 860 ℃ and tempering is carried out at 200 ℃.
In summary, the low-silicon microalloyed high-temperature carburized gear steel and the manufacturing method thereof have the advantages that:
the content of Al and N elements is controlled, the content of Al is reduced, then the effective control of smelting low oxygen content is combined, the forming quantity of Al2O3 brittle inclusions is reduced, calcium treatment is strictly forbidden after vacuum is adopted, the soft argon blowing time is prolonged, the floating removal of large-size inclusions is promoted, the enrichment of the inclusions on the inner side of a water gap is greatly reduced, the steady state control of a stopper rod curve in the casting process is realized, the stopper rod curve is prevented from being involved in the large-size inclusions due to sudden fluctuation, at least 6-furnace continuous casting production can be realized, the service fatigue life of a gear is obviously prolonged, the abnormal growth of austenite grains is hindered, the austenite grain coarsening temperature of the gear steel is improved, and therefore the effects of preventing mixed crystals and coarse grains of the austenite grains of the gear steel after the high carburization temperature.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A low-silicon microalloyed high-temperature carburized gear steel and a manufacturing method thereof are characterized in that: the method comprises the following steps:
the first step is as follows: smelting in a converter
Adding about 20% of scrap steel into a converter, then adding molten iron for smelting, and tapping at the end point: c is more than or equal to 0.08 percent, P is less than or equal to 0.015 percent, and the sliding plate slag stopping operation is carried out in the tapping process to reduce the slag; alloying is started about 90 seconds after tapping is started, and the adding sequence is as follows: ferro-aluminium-carbon powder-alloy-lime;
the second step is that: refining in LF ladle furnace
Controlling the alkalinity of the slag to be 2.0-3.0, and simultaneously controlling the flow of Ar gas well to prevent slag entrapment caused by severe rolling of molten steel; comprehensive deoxidation is carried out by adopting a slag surface composite deoxidizer and silicon carbide diffusion deoxidation, the using amount of the slag surface composite deoxidizer is more than or equal to 150kg, and more than or equal to 80kg of silicon carbide and a small amount of ferrosilicon powder are added in the middle and later stages of smelting to maintain the slag;
the third step: RH vacuum degassing
After the molten steel is treated for 5min in vacuum, ferrotitanium is added for nitrogen fixation, the vacuum degree is kept below 0.266kPa for more than or equal to 18min, which is beneficial to reducing large-particle inclusions; in order to ensure that nitrogen is stable and controllable, nitrogen is increased by blowing nitrogen in the whole process in vacuum treatment, and nitrogen is increased by feeding a nitrogen-chromium line after the vacuum treatment is finished; after the vacuum treatment is finished, the calcium treatment is forbidden to prevent the formation of Ca and Al composite inclusions from blocking a water gap; after vacuum treatment, hoisting the steel ladle to a soft argon blowing station for soft argon blowing operation, keeping argon blowing for more than 20min to promote floating, gathering and removing of impurities, and strictly keeping molten steel bare on the premise that the slag surface is not blown broken and slightly fluctuated by the soft argon blowing flow;
the fourth step: continuous casting
In the continuous casting process, measures such as argon sealing of a large ladle long nozzle, immersion of a middle ladle nozzle, covering agent of a middle ladle, mold protecting slag and the like are used for carrying out whole-process protective pouring on molten steel, the pouring temperature of a middle ladle is controlled to be 1533 +/-10 ℃, pouring is carried out at a constant pulling speed, and meanwhile, technological measures such as electromagnetic stirring of a crystallizer, weak cooling of secondary cooling water and the like are adopted to improve the internal quality of a casting blank;
in order to prevent the casting blank from generating microcracks, the casting blank is hoisted into a slow cooling pit for high-temperature slow cooling after being cut, and the surface temperature of the pit is ensured to be more than or equal to 610 ℃;
the fifth step: heating and rolling the casting blank into round steel
A round steel sample simulation carburizing and quenching process comprises the following steps: carburizing is carried out by keeping the temperature at 1010 ℃ for two hours, carburizing is carried out by keeping the temperature at 1020 ℃ for four hours, carburizing is carried out by keeping the temperature at 1030 ℃ for six hours, and then quenching is carried out at 860 ℃ and tempering is carried out at 200 ℃.
2. The low silicon microalloyed high temperature carburized gear steel and its manufacturing method according to claim 1, characterized in that: when the converter taps, the stirring kinetic energy during tapping is utilized, and a proper amount of lime is added for slag washing to pre-manufacture reducing slag, so that the alkalinity is ensured, and rephosphorization and silicon return are prevented; the components and the temperature are stirred evenly in a soft way in the whole tapping process; steel core aluminum is adopted for molten steel deoxidation; according to the slag amount, adding a proper amount of modifier in time after tapping; high carbon manganese is used for alloying.
3. The low silicon microalloyed high temperature carburized gear steel and its manufacturing method according to claim 1, characterized in that: and the stopper curve in the continuous casting process is strictly controlled in the continuous casting process, and the steady-state control of the stopper curve in the casting process is kept.
4. The low silicon microalloyed high temperature carburized gear steel and its manufacturing method according to claim 1, characterized in that: the converter can generate a large amount of brown smoke in the steelmaking process, and the main components of the brown smoke comprise iron oxide dust particles, high-concentration carbon monoxide gas and the like, so the brown smoke must be purified, recovered and comprehensively utilized to prevent the environmental pollution, and the iron oxide dust particles obtained from the recovery equipment can be used for steelmaking; carbon monoxide can be used as a chemical raw material or a fuel; the heat brought out by the flue gas can be used for generating steam as a byproduct.
5. The low silicon microalloyed high temperature carburized gear steel and its manufacturing method according to claim 1, characterized in that: in the RH vacuum degassing process, the temperature is reduced too fast to achieve the treatment purpose due to the excessively small molten steel amount, the capacity of a steel ladle is generally more than or equal to 30t, when the molten steel capacity is large, the thermal stability is good, the treatment can be performed leisurely, a good treatment result is achieved, and the vacuum pump has enough capacity to ensure the vacuum level during degassing treatment and the treatment quality of the molten steel.
6. The low silicon microalloyed high temperature carburized gear steel and its manufacturing method according to claim 1, characterized in that: in the converter smelting process, the adding amount of the aluminum-iron alloy is controlled to be 80 +/-20 kg, and the tapping temperature is ensured to be more than or equal to 1610 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011377758.9A CN112593036A (en) | 2020-11-30 | 2020-11-30 | Low-silicon microalloyed high-temperature carburized gear steel and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011377758.9A CN112593036A (en) | 2020-11-30 | 2020-11-30 | Low-silicon microalloyed high-temperature carburized gear steel and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112593036A true CN112593036A (en) | 2021-04-02 |
Family
ID=75187396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011377758.9A Pending CN112593036A (en) | 2020-11-30 | 2020-11-30 | Low-silicon microalloyed high-temperature carburized gear steel and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112593036A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113667890A (en) * | 2021-07-21 | 2021-11-19 | 江苏联峰能源装备有限公司 | Low-silicon microalloyed high-temperature carburized gear steel and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006183094A (en) * | 2004-12-27 | 2006-07-13 | Nippon Steel Corp | Case hardening steel having excellent tooth flank fatigue strength and gear using the same |
| CN108893575A (en) * | 2018-07-06 | 2018-11-27 | 新疆八钢铁股份有限公司 | It is a kind of to refine the slag former applied in production |
| CN108950125A (en) * | 2018-07-25 | 2018-12-07 | 承德建龙特殊钢有限公司 | A method of reducing boron content in 20CrMnTiH pinion steel |
| CN109402498A (en) * | 2018-08-29 | 2019-03-01 | 宝钢特钢韶关有限公司 | A kind of high-temperature carburizing pinion steel and its manufacturing method |
-
2020
- 2020-11-30 CN CN202011377758.9A patent/CN112593036A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006183094A (en) * | 2004-12-27 | 2006-07-13 | Nippon Steel Corp | Case hardening steel having excellent tooth flank fatigue strength and gear using the same |
| CN108893575A (en) * | 2018-07-06 | 2018-11-27 | 新疆八钢铁股份有限公司 | It is a kind of to refine the slag former applied in production |
| CN108950125A (en) * | 2018-07-25 | 2018-12-07 | 承德建龙特殊钢有限公司 | A method of reducing boron content in 20CrMnTiH pinion steel |
| CN109402498A (en) * | 2018-08-29 | 2019-03-01 | 宝钢特钢韶关有限公司 | A kind of high-temperature carburizing pinion steel and its manufacturing method |
Non-Patent Citations (2)
| Title |
|---|
| 萧忠敏: "《武钢炼钢生产技术进步概况》", 31 December 2003, 冶金工业出版社 * |
| 陕西省安全生产委员会办公室: "《安全生产监督检查工作手册 第2册》", 31 October 2015, 陕西科学技术出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113667890A (en) * | 2021-07-21 | 2021-11-19 | 江苏联峰能源装备有限公司 | Low-silicon microalloyed high-temperature carburized gear steel and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020215688A1 (en) | Process for smelting ultra-low-carbon and ultra-low-sulfur steel | |
| CN108823346B (en) | method for producing secondary flaw detection Q345R medium steel plate with low cost | |
| CN109402498B (en) | High-temperature carburized gear steel and manufacturing method thereof | |
| CN109852893B (en) | Low-temperature high-toughness refractory steel and preparation method thereof | |
| CN102433504A (en) | Steel for medium/heavy duty vehicle gear shaft blank in cross wedge rolling process and preparation method thereof | |
| CN103276153B (en) | Method for reducing nitrogen content of welding steel wire rod | |
| CN109797345B (en) | Steel for sulfur-resistant gas cylinder pipe and manufacturing method thereof | |
| CN109837460B (en) | Steel INC35E for railway passenger car and freight car axle and manufacturing method thereof | |
| CN108893682B (en) | Die steel billet and preparation method thereof | |
| CN113528976B (en) | Non-quenched and tempered bar without surface cracks and preparation method thereof | |
| CN112593036A (en) | Low-silicon microalloyed high-temperature carburized gear steel and manufacturing method thereof | |
| CN101323891B (en) | Manufacturing method of pure high manganese steel cross frog | |
| CN114855060B (en) | Pipeline steel X80 and production method thereof | |
| CN113981306B (en) | Production method of high-cleanliness bearing steel | |
| CN113817968B (en) | Continuous casting production method for square billet of medium-carbon high-aluminum steel | |
| CN109930064A (en) | A kind of effective heat resisting steel of corrosion-resistant high-pressure boiler and its production method | |
| CN104099443A (en) | CrMo steel scrap dephosphorization and chrome-preservation smelting process | |
| CN110218839B (en) | Deep desulfurization method in bearing steel smelting process | |
| CN114480987A (en) | Rare earth-containing NM600 wear-resistant steel plate and preparation method thereof | |
| JPS6339336B2 (en) | ||
| CN116904863B (en) | High-cleanliness high-carbon steel and low-carbon-emission production method thereof | |
| CN115491457B (en) | Converter slagging process applied to deformed steel bar production | |
| CN115433805B (en) | Production method of ultralow-carbon steel | |
| CN116875912B (en) | High-purity high-carbon steel wire rod and production method thereof | |
| CN116356119B (en) | High-efficiency steelmaking nitrogen control method based on hydrogen-containing plasma blowing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210402 |
|
| RJ01 | Rejection of invention patent application after publication |