CN115612784A - SPHD steel and method for reducing addition amount of RH process aluminum-based deoxidizer - Google Patents
SPHD steel and method for reducing addition amount of RH process aluminum-based deoxidizer Download PDFInfo
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 96
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 82
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 49
- 229910052760 oxygen Inorganic materials 0.000 claims description 49
- 239000001301 oxygen Substances 0.000 claims description 49
- 238000007664 blowing Methods 0.000 claims description 40
- 238000007670 refining Methods 0.000 claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 229910000655 Killed steel Inorganic materials 0.000 abstract description 4
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 7
- 238000009489 vacuum treatment Methods 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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
- 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
-
- 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
-
- 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
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- 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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- 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 belongs to the technical field of ferrous metallurgy, in particular to SPHD steel and a method for reducing the addition of an aluminum-based deoxidizer in an RH process in the production process thereof, which are more standard and scientific compared with the prior deoxidation system, reduce the consumption cost of the deoxidizer and obtain certain economic benefit; the addition amount of the aluminum-based deoxidizer is reduced, so that Al in steel is reduced 2 O 3 Inclusion ofThe quality of molten steel is reduced and improved; the castability of the molten steel is improved, and the production efficiency is improved; can ensure to reduce the consumption of the aluminum-based deoxidizer and improve the quality of molten steel, has reference value for other aluminum killed steel, and has certain popularization significance.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to SPHD steel and a method for reducing the addition of an aluminum-based deoxidizer in an RH process.
Background
SPHD steel belongs to low-carbon aluminum killed steel, has excellent deep drawing performance, is widely used as high-quality cold-rolled raw material steel, is mainly used for producing cold-rolled steel plates or steel strips in a cold-rolling production line, and is used as deep processing materials for stamping panel forming and the like. The quality requirement of SPHD steel on molten steel is very strict, and the SPHD steel belongs to aluminum killed steel, so a large amount of aluminum-based deoxidizer is required to be added for deoxidation in the refining process, and simultaneously, 0.02-0.05% of acid-soluble aluminum in the steel is also required to be kept. Because the price of the aluminum-based deoxidizer is high, if the aluminum-based deoxidizer in the RH refining process is not well controlled, the production cost is greatly increased, and the Al-based deoxidizer has poor Al control performance 2 O 3 As a deoxidation product, the steel liquid can be polluted, the inclusion content is increased, and the castability of the steel liquid is influenced. In the face of intense market competition, cost reduction, efficiency improvement and potential improvement are problems to be solved urgently by steel enterprises, so that a method for reducing the consumption of RH refining aluminum-based deoxidizer without influencing the cleanliness of molten steel is needed to be developed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention mainly aims to provide SPHD steel and a method for reducing the addition amount of an aluminum-based deoxidizer in an RH process thereof, which can solve the problems of cost waste and Al waste caused by excessive addition of the aluminum-based deoxidizer in the RH refining process of the SPHD steel 2 O 3 The pollution to molten steel.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
a method for reducing the addition of Al-based deoxidizer in SPHD steel RH process is characterized by controlling the addition of Al-based deoxidizer according to RH arrival temperature, vacuum duration and oxygen blowing amount.
As a preferable scheme of the method for reducing the addition amount of the aluminum-based deoxidizer in the SPHD steel RH process, the method comprises the following steps: according to the RH arrival temperature, the vacuum time and the oxygen blowing amount, the adding amount of the aluminum-based deoxidizer is controlled as follows:
(1) RH arrival temperature is lower than 1620 ℃, vacuum time is less than 25min, oxygen blowing amount is less than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.45-1.50 kg/t;
(2) RH arrival temperature is lower than 1620 ℃, vacuum time is less than 25min, and oxygen blowing amount is more than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.51-1.60 kg/t;
(3) RH arrival temperature is lower than 1620 ℃, vacuum time is longer than 25min, oxygen blowing amount is larger than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.30-1.33 kg/t;
(4) RH arrival temperature is lower than 1620 ℃, vacuum time is longer than 25min, oxygen blowing amount is less than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.34-1.36 kg/t;
(5) RH arrival temperature is higher than 1620 ℃, vacuum time is less than 25min, oxygen blowing amount is less than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.10-1.15 kg/t;
(6) RH arrival temperature is higher than 1620 ℃, vacuum time is less than 25min, and oxygen blowing amount is more than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.38-1.43 kg/t;
(7) The RH arrival temperature is higher than 1620 ℃, the vacuum time is longer than 25min, and the oxygen blowing amount is larger than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.28-1.35 kg/t;
(8) RH arrival temperature is higher than 1620 ℃, vacuum time is higher than 25min, and oxygen blowing amount is less than 60m 3 When in use, 1.20 to 1.26kg/t of aluminum-based deoxidizer is added.
As a preferable scheme of the method for reducing the addition amount of the aluminum-based deoxidizer in the SPHD steel RH process, the method comprises the following steps: other parameters of the RH process when the aluminum-based deoxidizer is added are as follows: the maximum vacuum degree is less than or equal to 5kPa, and the circulating air flow is 25 to 50NL/min.
As a preferable scheme of the method for reducing the addition amount of the aluminum-based deoxidizer in the SPHD steel RH process, the method comprises the following steps: the parameters of the RH device adopted by the RH process are as follows: the inner diameter of the vacuum tank is 1800-2100 mm, the height of the vacuum tank is 8000-9500 mm, the inner diameter of the hot bend pipe is 1500-1800 mm, and the inner diameter of the dip pipe is 500-800 mm.
As a preferable scheme of the method for reducing the addition amount of the aluminum-based deoxidizer in the SPHD steel RH process, the method comprises the following steps: the parameters of the RH device adopted by the RH process are as follows: the inner diameter of the vacuum tank is 1800-2000 mm, the height of the vacuum tank is 8000-9000 mm, the inner diameter of the hot bend pipe is 1600-1800 mm, and the inner diameter of the dip pipe is 500-700 mm.
As a preferable scheme of the method for reducing the addition amount of the aluminum-based deoxidizer in the SPHD steel RH process, the method comprises the following steps: before the aluminum-based deoxidizer is added in the RH process, a refining agent is added according to the proportion of 1.0-1.3 kg/t, and the refining agent comprises the following components: 40 to 45 weight percent of CaO and Al 2 O 3 25～28％、Al 20～25％、SiO 2 5～10％。
As a preferable scheme of the method for reducing the addition amount of the aluminum-based deoxidizer in the SPHD steel RH process, the method comprises the following steps: the molten steel after the converter process directly enters an RH process or undergoes other refining procedures and then enters the RH process, the carbon content at the smelting end point of the converter is 0.04-0.07 wt%, the end point temperature is 1660-1690 ℃, and the oxygen content at the end point is 400-700 ppm.
In order to solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solutions:
the SPHD steel is prepared by adopting the method for reducing the addition of the RH process aluminum-based deoxidizer in the production process of the SPHD steel.
As a preferable scheme of the SPHD steel of the invention, the following steps are adopted: the SPHD steel comprises, by weight, less than or equal to 0.06 percent of C, less than or equal to 0.05 percent of Si, 0.2 to 0.35 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.02 percent of S, and Al t 0.02 to 0.05, and the balance Fe and inevitable impurities, wherein W in the SPHD steel [Als] /W [Alt] ≥94％，W [Als] Is the acid-soluble aluminum content, W [Alt] Is the total aluminum content.
The invention has the following beneficial effects:
the invention provides SPHD steel and a method for reducing the addition of an aluminum-based deoxidizer in an RH process in the production process thereof, compared with the prior deoxidation systemThe method is standard and scientific, reduces the consumption cost of the deoxidizer and obtains certain economic benefit; the addition amount of the aluminum-based deoxidizer is reduced, so that Al in steel is reduced 2 O 3 The inclusion is reduced, and the quality of molten steel is improved; the castability of the molten steel is improved, and the production efficiency is improved; can ensure to reduce the consumption of the aluminum-based deoxidizer and improve the quality of molten steel, has reference value for other aluminum killed steel, and has certain popularization significance.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
According to one aspect of the invention, the invention provides the following technical scheme:
a method for reducing the addition of Al-based deoxidizer in SPHD steel RH process is characterized by controlling the addition of Al-based deoxidizer according to RH arrival temperature, vacuum duration and oxygen blowing amount.
According to the RH arrival temperature, the vacuum time and the oxygen blowing amount, the adding amount of the aluminum-based deoxidizer is controlled as follows:
(1) RH arrival temperature is lower than 1620 ℃, vacuum time is less than 25min, oxygen blowing amount is less than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.45-1.50 kg/t;
(2) RH arrival temperature is lower than 1620 ℃, vacuum time is less than 25min, and oxygen blowing amount is more than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.51-1.60 kg/t;
(3) RH arrival temperature is lower than 1620 ℃, vacuum time is longer than 25min, and oxygen blowing amount is larger than 60m 3 Then, adding an aluminum-based deoxidizer according to 1.30-1.33 kg/t;
(4) RH arrival temperature is lower than 1620 ℃, vacuum time is longer than 25min, oxygen blowing amount is less than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.34-1.36 kg/t;
(5) The RH arrival temperature is higher than 1620 ℃, the vacuum time is less than 25min,oxygen blowing amount is less than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.10-1.15 kg/t;
(6) RH arrival temperature is higher than 1620 ℃, vacuum time is less than 25min, and oxygen blowing amount is more than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.38-1.43 kg/t;
(7) The RH arrival temperature is higher than 1620 ℃, the vacuum time is longer than 25min, and the oxygen blowing amount is larger than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.28-1.35 kg/t;
(8) RH arrival temperature is higher than 1620 ℃, vacuum time is higher than 25min, and oxygen blowing amount is less than 60m 3 When the aluminum-based deoxidizer is added, the aluminum-based deoxidizer is added according to the proportion of 1.20 to 1.26 kg/t.
The aluminum-based deoxidizer is an aluminum-based deoxidizer commonly used in the art, such as aluminum particles, aluminum blocks, aluminum bars and the like, and the addition amount thereof can be properly adjusted according to the specific aluminum-based deoxidizer.
Other parameters of the RH process when the aluminum-based deoxidizer is added are as follows: the maximum vacuum degree is less than or equal to 5kPa, and the circulating air flow is 25 to 50NL/min.
The parameters of the RH device adopted by the RH process are as follows: the inner diameter of the vacuum tank is 1800-2100 mm, the height of the vacuum tank is 8000-9500 mm, the inner diameter of the hot bend pipe is 1500-1800 mm, and the inner diameter of the dip pipe is 500-800 mm. Preferably, the parameters of the RH apparatus used in the RH process are: the inner diameter of the vacuum tank is 1800-2000 mm, the height of the vacuum tank is 8000-9000 mm, the inner diameter of the hot bend pipe is 1600-1800 mm, and the inner diameter of the dip pipe is 500-700 mm.
Before the aluminum-based deoxidizer is added in the RH process, a refining agent is added according to the proportion of 1.0-1.3 kg/t, and the refining agent comprises the following components: 40 to 45 weight percent of CaO and Al 2 O 3 25～28％、Al 20～25％、SiO 2 5 to 10 percent. Specifically, the refining agent is added in an amount of, for example, but not limited to, any one of 1.0kg/t, 1.1kg/t, 1.2kg/t, 1.3kg/t, or a range between any two of them.
The molten steel after the converter process directly enters an RH process or undergoes other refining procedures and then enters the RH process, the carbon content at the smelting end point of the converter is 0.04-0.07 wt%, the end point temperature is 1660-1690 ℃, and the oxygen content at the end point is 400-700 ppm.
In the converter smelting process, no carbon powder is added after the number of times that the end point oxygen content of converter blowing is below 700ppm, the number of times that the end point oxygen content is 700-800 ppm is added with carbon powder according to 0.08-0.15 kg/t, and the number of times that the end point oxygen content is more than 800ppm is pre-deoxidized by adding carbon powder according to 0.15-0.30 kg/t.
The invention also provides SPHD steel which is prepared by adopting the method for reducing the addition of the aluminum-based deoxidizer in the RH process in the production process of the SPHD steel. The SPHD steel comprises, by weight, not more than 0.06% of C, not more than 0.05% of Si, 0.2-0.35% of Mn, not more than 0.025% of P, not more than 0.02% of S, and Al t 0.02 to 0.05, and the balance Fe and inevitable impurities, wherein W in the SPHD steel [Als] /W [Alt] ≥94％，W [Als] Is the acid-soluble aluminum content, W [Alt] For total aluminum content, a higher ratio indicates a higher cleanliness of the molten steel.
The technical solution of the present invention is further illustrated by the following specific examples.
Example 1
The production process of SPHD steel has the heat molten steel amount of 197.1t.
The end point carbon content of the converter is 0.0436%, the end point temperature is 1684 ℃, and the end point oxygen is 682ppm;
the station entering temperature of RH refining is 1634 ℃, the vacuum treatment time is 15.5min, and the oxygen blowing amount is 39.98m 3 Controlling the addition amount of aluminum particles to be 220kg, namely 1.12kg/t according to the RH arrival temperature, the vacuum time length and the oxygen blowing amount; the maximum vacuum degree during the aluminum pellet feeding was 3.715kPa, and the circulating air flow rate was 28.505NL/min.
RH outbound W [Als] ＝0.0467％，W [Alt] ＝0.0492％，W [Als] /W [Alt] ＝0.9491。
Example 2
The production process of SPHD steel has the heat molten steel amount of 191.6t.
The end point carbon content of the converter is 0.0632%, the end point temperature is 1670 ℃, and the end point oxygen is 484ppm;
the RH refining station entering temperature is 1633 ℃, the vacuum treatment time is 17min, and the oxygen blowing amount is 39.97m 3 Controlling the addition amount of aluminum particles to be 213kg, namely 1.11kg/t, according to the RH arrival temperature, the vacuum time length and the oxygen blowing amount; when aluminum particles are addedThe maximum vacuum was 3.114kPa and the loop flow rate was 45.478NL/min.
RH outbound W [Als] ＝0.0449％，W [Alt] ＝0.0472％，W [Als] /W [Alt] ＝0.9512。
Example 3
The production process of SPHD steel has the molten steel amount in the furnace of 195.5t.
The end point carbon content of the converter is 0.0695%, the end point temperature is 1661 ℃, and the end point oxygen is 439ppm;
the station entering temperature of RH refining is 1618 ℃, the vacuum treatment time is 26min, and the oxygen blowing amount is 48.87m 3 Controlling the addition amount of aluminum particles to be 256kg, namely 1.31kg/t, according to the RH arrival temperature, the vacuum time and the oxygen blowing amount; the maximum vacuum degree during the addition of the aluminum particles was 4.332kPa, and the circulating air flow rate was 38.910NL/min.
RH outbound W [Als] ＝0.0463％，W [Alt] ＝0.0489％，W [Als] /W [Alt] ＝0.9467。
Comparative example 1
The production process of SPHD steel has the heat molten steel amount of 197.6t.
The end point carbon content of the converter is 0.0402%, the end point temperature is 1679 ℃, and the end point oxygen is 730ppm;
the RH refining station entering temperature is 1578 ℃, the vacuum treatment time is 28.5min, and the oxygen blowing amount is 69.97m 3 318kg of aluminum particles are added, namely 1.609kg/t; the maximum vacuum degree during the addition of the aluminum particles was 2.813kPa, and the circulating air flow rate was 51.248NL/min.
RH outbound W [Als] ＝0.0464％，W [Alt] ＝0.0514％，W [Als] /W [Alt] ＝0.9027。
As can be seen from the above examples and comparative examples, the W of SPHD steel prepared in comparative example 1 [Als] /W [Alt] =0.9027, and the adding amount of aluminum particles is 1.609kg per ton of steel; compared with the comparative example 1, the examples 1 to 3 adopt the method for reducing the addition amount of the aluminum-based deoxidizer in the RH process in the SPHD steel production process, the addition amount of the aluminum-based deoxidizer is controlled according to the RH arrival temperature, the vacuum time and the oxygen blowing amount, and the addition amount of the aluminum particles is reduced compared with the comparative example 1 in the example 1By 30.4%, and W [Als] /W [Alt] The improvement is 5.14%; example 2 the amount of added aluminum particles was reduced by 31.0% compared to comparative example 1, and W was [Als] /W [Alt] The improvement is 5.37%; example 3 the amount of added aluminum particles was reduced by 18.6% compared to comparative example 1, while W was reduced by [Als] /W [Alt] The improvement is 4.87%. The method provided by the invention controls the addition amount of the aluminum-based deoxidizer according to the technological parameters such as RH arrival temperature, vacuum duration, oxygen blowing amount and the like, can reduce the consumption of the aluminum-based deoxidizer, further reduce the production cost, and simultaneously can reduce Al 2 O 3 The inclusion is generated, and the quality and the castability of the molten steel are improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the content of the present specification or other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The SPHD steel is characterized in that the weight percentage of C is less than or equal to 0.06, si is less than or equal to 0.05, mn0.2-0.35, P is less than or equal to 0.025, S is less than or equal to 0.02, al t 0.02 to 0.05, and the balance Fe and inevitable impurities, wherein W in the SPHD steel [Als] /W [Alt] Not less than 94%, wherein W [Als] Is the acid-soluble aluminum content, W [Alt] Is the total aluminum content.
2. A method for reducing the addition of aluminum-based deoxidizer in SPHD steel RH process is characterized in that the addition of the aluminum-based deoxidizer is controlled according to RH arrival temperature, vacuum duration and oxygen blowing amount.
3. The method according to claim 2, characterized in that the amount of aluminum-based deoxidizer added is controlled according to the RH arrival temperature, the vacuum duration and the oxygen blowing amount, and specifically:
(1) RH arrival temperature is lower than 1620 ℃, vacuum time is less than 25min, oxygen blowing amount is less than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.45-1.50 kg/t;
(2) RH arrival temperature is lower than 1620 ℃, vacuum duration is less than 25min, and oxygen blowing amount is more than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.51-1.60 kg/t;
(3) RH arrival temperature is lower than 1620 ℃, vacuum time is longer than 25min, oxygen blowing amount is larger than 60m 3 Then, adding an aluminum-based deoxidizer according to 1.30-1.33 kg/t;
(4) RH arrival temperature is lower than 1620 ℃, vacuum time is longer than 25min, and oxygen blowing amount is less than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.34-1.36 kg/t;
(5) RH arrival temperature is higher than 1620 ℃, vacuum time is less than 25min, oxygen blowing amount is less than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.10-1.15 kg/t;
(6) RH arrival temperature is higher than 1620 ℃, vacuum time is less than 25min, and oxygen blowing amount is more than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.38-1.43 kg/t;
(7) The RH arrival temperature is higher than 1620 ℃, the vacuum time is longer than 25min, and the oxygen blowing amount is larger than 60m 3 Then, adding an aluminum-based deoxidizer according to the proportion of 1.28-1.35 kg/t;
(8) RH arrival temperature is higher than 1620 ℃, vacuum duration is higher than 25min, and oxygen blowing amount is less than 60m 3 When in use, 1.20 to 1.26kg/t of aluminum-based deoxidizer is added.
4. The method according to claim 2, characterized in that the other parameters of the RH process when the al-based deoxidizer is added are: the maximum vacuum degree is less than or equal to 5kPa, and the circulating air flow is 25 to 50NL/min.
5. The method of claim 2, wherein the parameters of the RH equipment used in the RH process are: the inner diameter of the vacuum tank is 1800-2100 mm, the height of the vacuum tank is 8000-9500 mm, the inner diameter of the hot bend pipe is 1500-1800 mm, and the inner diameter of the dip pipe is 500-800 mm.
6. The method of claim 5, wherein the RH process employs RH equipment having parameters: the inner diameter of the vacuum tank is 1800-2000 mm, the height of the vacuum tank is 8000-9000 mm, the inner diameter of the hot bend pipe is 1600-1800 mm, and the inner diameter of the dip pipe is 500-700 mm.
7. The method as claimed in claim 2, wherein before the addition of the al-based deoxidizer in the RH process, a refining agent is added in an amount of 1.0 to 1.3kg/t, the refining agent having a composition comprising: caO 40-45 wt%, al 2 O 3 25～28％、Al 20～25％、SiO 2 5～10％。
8. The method as claimed in claim 7, wherein before the addition of the aluminum-based deoxidizer in the RH process, the refining agent is added at 1.1-1.2 kg/t.
9. The method as claimed in claim 2, wherein the molten steel after the converter process is directly subjected to the RH process or subjected to other refining processes to be subjected to the RH process, the converter smelting end point carbon content is 0.04-0.07 wt%, the end point temperature is 1660-1690 ℃, and the end point oxygen content is 400-700 ppm.
10. SPHD steel produced by a method according to any one of claims 2 to 9.
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| CN202211385745.5A CN115612784A (en) | 2022-11-07 | 2022-11-07 | SPHD steel and method for reducing addition amount of RH process aluminum-based deoxidizer |
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