CN115612912B - Refining method for controlling sulfur of structural steel for aluminum-containing shaft - Google Patents

Refining method for controlling sulfur of structural steel for aluminum-containing shaft Download PDF

Info

Publication number
CN115612912B
CN115612912B CN202211232456.1A CN202211232456A CN115612912B CN 115612912 B CN115612912 B CN 115612912B CN 202211232456 A CN202211232456 A CN 202211232456A CN 115612912 B CN115612912 B CN 115612912B
Authority
CN
China
Prior art keywords
slag
steel
refining
content
aluminum
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.)
Active
Application number
CN202211232456.1A
Other languages
Chinese (zh)
Other versions
CN115612912A (en
Inventor
屠兴圹
苏振伟
赵赟
周淼
黄云飞
高协清
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zenith Steel Group Co Ltd
Changzhou Zenith Special Steel Co Ltd
Original Assignee
Zenith Steel Group Co Ltd
Changzhou Zenith Special Steel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zenith Steel Group Co Ltd, Changzhou Zenith Special Steel Co Ltd filed Critical Zenith Steel Group Co Ltd
Priority to CN202211232456.1A priority Critical patent/CN115612912B/en
Publication of CN115612912A publication Critical patent/CN115612912A/en
Application granted granted Critical
Publication of CN115612912B publication Critical patent/CN115612912B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C21C7/0006—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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • 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
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • 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
    • 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
    • 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

Abstract

The invention belongs to the technical field of steelmaking, and particularly discloses a sulfur-controlling refining method of structural steel for aluminum-containing shafts, which comprises the steps of deoxidizing Si and Mn during converter tapping, adding lime and a slag melting agent to perform slag formation, controlling the alkalinity of slag in the refining process to be 1.5-3.5, deoxidizing the slag surface by adopting calcium carbide and silicon carbide during the refining process, adding fluorite and lime to perform slag formation according to the flowing condition of slag, and adjusting the content of Al in components by adopting an Al feeding line before the refining is finished. The invention adopts Si and Mn deoxidization to tapping steel of the converter, and the slag surface does not adopt aluminum-containing deoxidizer in the refining process, thereby controlling slag to be low-alkalinity slag, ensuring that the S content in molten steel in the refining process is not removed, adopting Al wire feeding to adjust the Al content before the refining is finished, simultaneously controlling the generation of low-melting-point calcium aluminate inclusion in the refining process, preventing the problem of exceeding Ds inclusion, achieving the purpose of smelting aluminum-containing sulfur-containing steel, reducing the production cost and improving the product quality.

Description

Refining method for controlling sulfur of structural steel for aluminum-containing shaft
Technical Field
The invention belongs to the technical field of steelmaking, relates to a production method of structural steel for shafts, and in particular relates to a sulfur-control refining method of structural steel for aluminum-containing shafts.
Background
The shaft parts are products with higher requirements in structural steel processing, and are mainly used for transmitting torque and bearing load, and the requirements of the parts on surface roughness, geometric shape, dimensional accuracy and the like are high, so that the requirements on the processing performance and the processing technology of raw materials are more and more severe. Meanwhile, with the continuous development of the automobile industry, the use amount of parts such as an automobile shock absorber shaft, a steering shaft and the like is gradually increased, and the use amount of structural steel for the shaft is also gradually increased in the market.
The high-quality carbon structural steel is a steel type commonly used for processing shaft parts, an aluminum block is generally adopted for strong deoxidization in the smelting process, so that the total oxygen in the steel is ensured to be controlled at a lower level, and meanwhile, al element in the steel can refine grains, so that the performance of the steel is improved. In order to improve the turning performance of shaft parts, a certain amount of S is usually added into steel, and MnS inclusions formed in the steel are adopted to become stress concentration points in the cutting process so as to obtain better machinability. But in the aluminum killed steel production process, aluminum blocks are generally adopted for deoxidization after a furnace, aluminum particles are adopted for deoxidization on the slag surface in the refining process, the slag alkalinity in the refining process is generally more than 5, along with the rising of the refining temperature, feO in the refining slag is gradually reduced, the S content in steel is gradually removed, and after the refining is finished, a FeS line is often required to be fed again for increasing S.
In order to ensure the service life of products in structural steel for aluminum-containing shafts, higher requirements are often put on Ds inclusion, the Ds inclusion is generally required to be less than 2.0 level, the Ds inclusion is a nonmetallic inclusion commonly used in aluminum deoxidized steel, the main component is low-melting-point calcium aluminate, and the problem that the Ds inclusion exceeds standard is often found in conventional process production. The Chinese patent 201610778355.2 proposes a process for controlling sulfur by adding slag of the last ladle casting into slag surface of the next ladle smelting process and utilizing slag surface sulfur to return into molten steel. Chinese patent 201811139368.0 'a control method for slagging process of bearing steel with all plastic inclusions' controls the process of tapping and refining by a converter to adopt aluminum-containing materialsAt the same time, the refining process controls the inclusion to be CaO-Al with better plasticity and low melting point through slag changing operation 2 O 3 -SiO 2 The Al content is controlled from the converter to the refining, so that the Al content in the steel is below 0.0015%, the steel becomes a typical production process of silicon deoxidized steel, but not aluminum deoxidized steel, in addition, the S content in the steel is a residual element, and the S content is removed to a certain extent through high-alkalinity slag in the earlier stage of refining. Therefore, aiming at the structural steel for the aluminum-containing shaft, the S content of which is 0.015-0.035%, the conventional production process is adopted to carry out slag surface strong deoxidation first, a large amount of low-melting-point calcium aluminate is easy to generate in the refining process, so that Ds inclusion exceeds standard, simultaneously desulfurization is carried out, S is increased by feeding a FeS line, and the production efficiency is low and the cost is increased.
Disclosure of Invention
The invention aims to provide a sulfur-controlling refining process of structural steel for aluminum-containing shafts, which is characterized in that aluminum blocks are not used for deoxidizing when converter tapping is performed, si and Mn in alloy are used for deoxidizing, aluminum-containing deoxidizing agent is not used for deoxidizing slag surface in LF refining, the alkalinity of slag in LF refining is controlled to form low-alkalinity slag, S in molten steel is not removed in a large amount, al content in steel is adjusted by feeding Al wires before LF refining is finished, and nonmetallic inclusion is ensured to be Al before calcium refining treatment 2 O 3 Thereby preventing the generation of low-melting-point calcium aluminate, controlling the S content in the LF refining process, avoiding the problem of S increase by feeding FeS again, and reducing the production cost.
The refining process of the structural steel for the aluminum-containing shaft for controlling sulfur comprises the following steps:
1) The converter uses molten iron and scrap steel as raw materials, a top-bottom combined blown converter is adopted for smelting, the tapping end temperature of the converter ranges from 1580 ℃ to 1640 ℃, and the end point S content is 0.015% -0.035%;
2) Firstly adding ferrosilicon, manganese, ferromanganese, carburant and the like in the converter tapping process for deoxidization alloying, namely adopting Si and Mn elements in the alloy for deoxidization, and then adding lime and a slag melting agent for slag formation;
wherein the CaO content in the lime is more than 90 percentThe activity is more than 300ml, the granularity is 5-60 mm, and CaO and Al in the slag melting agent 2 O 3 The content is 40% -50%, mgO and SiO 2 The content is less than 5 percent, and the granularity is 5-50 mm.
3) In the LF smelting process, calcium carbide and silicon carbide are adopted to carry out slag surface deoxidation, lime and fluorite are added according to the fluidity of the slag to carry out slag formation, the alkalinity of the slag in the LF refining process is controlled between 1.5 and 3.5, and the slag surface is forbidden to adopt an aluminum-containing deoxidizer to carry out deoxidation in the refining process;
wherein the granularity of the calcium carbide, the silicon carbide and the fluorite is between 3 and 20mm, and CaF in the fluorite 2 The content is more than 80 percent, siO 2 The content is less than 20 percent.
4) Before LF refining is finished, al content in the components is adjusted to be in place by adopting an Al wire, then 50-100 m of calcium wire is fed for carrying out denaturation treatment, soft blowing is carried out for 10-20 minutes, and molten steel is transported to continuous casting for casting.
The molten steel smelted before refining is finished is adjusted in place by other elements except Al element, and the temperature of the molten steel is also adjusted in place.
The key technical scheme of the invention comprises the following points:
(1) The invention adopts Al block deoxidization after the furnace is canceled, si and Mn in the alloy are utilized for deoxidization, LF refining is low-alkalinity slag, and the invention is unfavorable for S removal reaction.
(2) In the refining process, the aluminum-containing deoxidizer is not used for deoxidizing the slag surface, but calcium carbide and silicon carbide are used for deoxidizing the slag surface, and SiO in the slag is not existed 2 The problem of reduction ensures that the slag with low alkalinity is produced in the refining process, which is unfavorable for the S removal reaction.
(3) Before LF refining is finished, namely the temperature of molten steel and other alloy elements except Al element are adjusted in place, the Al content in the molten steel is adjusted to a target value by feeding Al wire, and the oxygen content in the steel is controlled at a lower level, so that the yield of the Al element can be improved by about 20%, the production cost is reduced, and the purpose of smelting aluminum-containing sulfur-containing structural steel is achieved.
(4) The aluminum-containing deoxidizer is not used for strong deoxidization after the converter and in the refining process, so that the reduction of CaO by Al in steel due to slag surface reaction is avoided, and Ca is provided for the steelThe source causes the inclusion to be treated with calcium in the refining process to generate calcium aluminate with low melting point, and before the refining is finished, other components are adjusted in place and then the Al content is adjusted by feeding Al wires, so that the slag surface reaction problem caused by adding Al particles to the slag surface is avoided, and the nonmetallic inclusion in the steel before the calcium treatment is ensured to be controlled to be Al 2 O 3 And the Ds inclusion exceeding problem is prevented.
The structural steel for the shaft comprises the following chemical components in percentage by mass: 0.10 to 0.55, si:0.10 to 0.40, mn:0.50 to 1.00, P is less than or equal to 0.035, S is 0.015 to 0.035, al:0.010 to 0.050, and the balance of iron and unavoidable impurities.
The invention adopts Si and Mn elements in the alloy to deoxidize after the furnace, proper lime and slag melting agent are added after the furnace to facilitate slag formation in the refining process, meanwhile, calcium carbide and silicon carbide are adopted to deoxidize the refining slag surface, the slag is always low-alkalinity slag from the start of refining to the end of refining, and on the premise of better slag fluidity, three elements of S removal are as follows: high temperature, low oxygen and high alkalinity, even if the temperature of molten steel is continuously increased along with the refining, and the oxygen in slag is gradually reduced, the slag is low-alkalinity slag, which is unfavorable for S removal reaction, thereby ensuring the S content in the molten steel, finally, the Al content in the molten steel is regulated by feeding Al wires before the refining is finished, and the generation of low-melting-point calcium aluminate inclusion in the refining process is controlled, so as to achieve the purpose of smelting aluminum-containing sulfur-containing structural steel.
The beneficial effects that adopt above-mentioned technical scheme to reach lie in:
the S content in the molten steel is not removed in the refining process, and meanwhile, the content of Al in the molten steel is controlled at a lower level before the refining is finished, the yield is improved by feeding Al wires to adjust the content of Al in the molten steel, the problem that Ds inclusion exceeds standard caused by the generation of low-melting-point calcium aluminate in the refining process is prevented, meanwhile, the problems that O and S are removed firstly in the traditional process, and S is increased by feeding FeS wires before the refining is finished are avoided, so that the production efficiency is improved, and the production cost is reduced.
Description of the drawings:
FIG. 1 is a schematic view of inclusions in refined steel as in example 1.
FIG. 2 is a schematic view of inclusions in steel before refining a calcium wire in example 1.
FIG. 3 is a schematic view of inclusions in a refined soft blown steel of example 1.
FIG. 4 is a schematic view of inclusions in refined steel as in comparative example 1.
FIG. 5 is a schematic view showing inclusions in steel before refining a calcium wire in comparative example 1.
FIG. 6 is a schematic view of inclusions in a refined soft blow finished steel of comparative example 1.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The production method of the present invention will be exemplified by using a 130 ton refining furnace for producing structural steel S15C, S35C, S C.
Example 1
The steel grade S15C, the converter tapping temperature is 1595 ℃, the tapping C is 0.08%, the tapping amount is 125 tons, 270kg of ferrosilicon and 460kg of silicomanganese are firstly added for deoxidization alloying during converter tapping, 50kg of carburant is added, and finally 500kg of lime and 200kg of slag forming agent are added for slag formation;
transferring molten steel to refining, taking slag samples and molten steel samples, sampling, heating molten steel, adding 80kg of calcium carbide to the slag surface for deoxidization, adding 50kg of fluorite for slag melting, heating for 10min, adding ferrosilicon and silicomanganese for adjusting the content of Si and Mn elements in the steel, adjusting the temperature, sampling, feeding 300m Al wire for adjusting the content of Al, taking slag samples and a steel water sample, namely, refining, taking slag samples, feeding 80 m calcium wire, soft blowing molten steel for 15min, transferring to continuous casting, soft blowing, finishing molten steel, sampling and inspecting nonmetallic inclusions after rolling the steel billet, wherein the slag samples and the molten steel samples are shown in the specification.
Example 2
The steel grade S35C, the tapping temperature of the converter is 1615 ℃, the tapping C is 0.09%, the tapping amount is 128 tons, 600kg of silicon-manganese and 620kg of high-carbon ferromanganese are firstly added for deoxidization alloying during tapping of the converter, 250kg of carburant is added, and finally 500kg of lime and 200kg of slag forming agent are added for slag formation;
transferring molten steel to refining, taking a slag sample and a steel water sample, heating the molten steel after sampling, adding 100kg of calcium carbide and 30kg of silicon carbide to the slag surface to deoxidize, adding 30kg of fluorite to perform slag melting, heating for 12min, adding ferrosilicon and ferrosilicon to adjust the content of Si and Mn in the steel, performing temperature adjustment, sampling at 1589 ℃ of the molten steel, feeding 350 m Al wire to adjust the content of Al, taking the slag sample and the steel water sample at the same time after the Al wire is fed, namely feeding 80 m calcium wire after refining is finished, transferring the molten steel to continuous casting after soft blowing for 13min, and sampling and inspecting nonmetallic inclusion after billet rolling.
Example 3
Steel grade S45C, converter tapping temperature 1625 ℃, tapping C of 0.10%, tapping amount of 125 tons, firstly adding 1150kg of silicomanganese for deoxidization alloying during converter tapping, simultaneously adding 360kg of carburant, and finally adding 500kg of lime and 200kg of slag former for slag formation;
transferring molten steel to refining, taking a slag sample and a steel water sample, heating the molten steel after sampling, adding 50kg of calcium carbide and 50kg of silicon carbide to the slag surface to deoxidize, heating for 15min, adding ferrosilicon and ferrosilicon to adjust the content of Si and Mn elements in the steel, adjusting the temperature, sampling at 1575 ℃, feeding 350 m Al wire to adjust the content of Al wire, taking the slag sample and the steel water sample at the same time after feeding the Al wire, namely, feeding 60m calcium wire after refining, transferring to continuous casting after soft blowing for 15min, sampling and inspecting nonmetallic inclusion after billet rolling.
Comparative example 1
The steel grade S15C, the converter tapping temperature is 1595 ℃, the tapping C is 0.08%, the tapping amount is 125 tons, firstly, 250kg of Al blocks are added for deoxidization during converter tapping, 260kg of ferrosilicon and 470kg of silicomanganese are added for alloying, simultaneously, 50kg of carburant is added, and finally, 500kg of lime and 200kg of slag former are added for slag formation;
transferring molten steel to refining, taking slag samples and molten steel samples, sampling, heating molten steel, adding 50kg aluminum particles and 30kg calcium carbide in total to deoxidize slag surface, heating for 8min, adding ferrosilicon and ferrosilicon to adjust Si and Mn element content in steel, adjusting temperature, sampling at 1600 ℃, feeding FeS line to adjust S content, taking slag samples and steel water samples at the same time after FeS line feeding, namely refining end samples, feeding 80 m calcium line, soft blowing molten steel for 15min, transferring to continuous casting, soft blowing end steel inclusion components as shown in FIG. 6, sampling and checking nonmetallic inclusion after billet rolling.
Comparative example 2
Steel grade S45C, converter tapping temperature 1625 ℃, tapping C of 0.12%, tapping amount of 125 tons, firstly adding 1150kg of silicomanganese for deoxidization alloying during converter tapping, simultaneously adding 360kg of carburant, and finally adding 500kg of lime and 200kg of slag former for slag formation;
transferring molten steel to refining, taking a slag sample and a steel water sample, heating the molten steel after sampling, adding 50kg of calcium carbide and 50kg of silicon carbide to the slag surface to deoxidize, heating for 15min, adding 400kg of lime and 200kg of fluorite to slag, adding ferrosilicon and ferrosilicon to adjust the content of Si and Mn in the steel, adjusting the temperature, sampling and feeding 300m Al wire to adjust the content of Al, taking the slag sample and the steel water sample after feeding Al wire, feeding FeS wire to adjust the content of S after 5min, taking the slag sample and the steel water sample after feeding FeS wire, namely finishing refining, feeding 65 m of calcium wire again, transferring to continuous casting after soft blowing of the molten steel for 18min, and sampling and checking nonmetallic inclusion after billet rolling.
The main components and the binary basicities of the refining furnace slag of examples 1 to 3 and comparative examples 1 to 2 of the present invention are shown in Table 1, the contents before feeding Al wire in the refining furnace, before feeding FeS wire in the examples and after feeding FeS wire in the comparative examples are shown in Table 2, and after rolling the billet, each of 5 samples was inspected for Ds rating and each sample was inspected for 200mm 2 The results are shown in Table 3.
TABLE 1
TABLE 2
TABLE 3 Table 3
As can be seen from the above table data, the Ds < 2.0 in the inclusion ratings of examples 1 to 3, but the Ds. Gtoreq.2.0 in the comparative examples, it can be seen from the inclusion in example 1 that the refining-incoming nonmetallic inclusion is mainly MnO-SiO 2 As shown in FIG. 1, the nonmetallic inclusion before the calcium treatment is Al 2 O 3 (FIG. 2), the nonmetallic inclusion at the end of soft blowing is Al 2 O 3 CaS (as in fig. 3); whereas the refining inlet nonmetallic inclusion in comparative example 1 was mainly Al 2 O 3 As shown in FIG. 4, the nonmetallic inclusion before the calcium treatment is CaO-Al 2 O 3 MgO, part of the inclusion enters a low-melting point region (as shown in figure 5), and the nonmetallic inclusion at the end of soft blowing is CaO-Al 2 O 3 CaS, predominantly low melting calcium aluminates (see fig. 6).
The binary alkalinity of the slag in the refining process of examples 1-3 is between 1.5 and 3.5, the S content in the steel in the refining process is reduced by 0.001-0.003%, and the requirement of the target components of the steel grade can be met without feeding FeS lines. The furnace of comparative example 1 adopts an Al block to carry out strong deoxidation, and meanwhile adopts Al particles to deoxidize during refining, so that the S content in steel during refining is reduced by 0.012%; the aluminum-containing deoxidizer is not adopted after the furnace and in the refining process in comparative example 2, but the S content in steel in the refining process is reduced by 0.010% by adjusting the alkalinity of the refining process, and the FeS line is fed in order to meet the requirements of target components of the steel.
The raw materials and equipment used in the invention are common raw materials and equipment in the field unless specified otherwise; the methods used in the present invention are conventional in the art unless otherwise specified. The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the invention, but all modifications of the foregoing embodiments according to the technical principles of the present invention are included in the scope of the present invention.

Claims (2)

1. The structural steel for the aluminum-containing shaft is characterized by comprising the following chemical components in percentage by mass: 0.10 to 0.55, si:0.10 to 0.40, mn:0.50 to 1.00, P is less than or equal to 0.035, S is 0.015 to 0.035, al:0.010 to 0.050, and the balance of iron and unavoidable impurities;
the preparation method of the structural steel for the shaft is that molten steel tapped from a converter is refined by an LF furnace, and the specific preparation method comprises the following steps:
(1) The converter uses molten iron and scrap steel as raw materials, a top-bottom combined blown converter is adopted for smelting, the tapping end temperature of the converter ranges from 1580 ℃ to 1640 ℃, and the end point S content is 0.015% -0.035%;
(2) Firstly adding ferrosilicon, manganese, ferromanganese and a carburant in the converter tapping process for deoxidization alloying, and then adding lime and a slag melting agent for slag formation;
the CaO content in lime is more than 90%, the activity is more than 300ml, the granularity is 5-60 mm, and CaO and Al in the slag melting agent 2 O 3 The content is 40% -50%, mgO and SiO 2 The content is less than 5 percent, and the granularity is 5-50 mm;
(3) In the LF furnace smelting process, calcium carbide and silicon carbide are adopted to carry out slag surface deoxidation, lime and fluorite are added according to slag fluidity to carry out slag formation, and the slag alkalinity in the LF refining process is controlled between 1.5 and 3.5;
the granularity of the calcium carbide, the silicon carbide and the fluorite is between 3 and 20mm, and CaF in the fluorite 2 The content is more than 80 percent, siO 2 The content is less than 20 percent;
(4) Before LF refining is finished, al content in the components is adjusted to be in place by adopting an Al wire, then 50-100 m of calcium wire is fed for carrying out denaturation treatment, soft blowing is carried out for 10-20 minutes, and molten steel is transported to continuous casting for casting.
2. The structural steel for aluminum-containing shafts according to claim 1, wherein in the step (4), the composition of the molten steel, other than Al element, which is smelted immediately before the end of refining is adjusted in place, and the temperature of the molten steel is also adjusted in place.
CN202211232456.1A 2022-10-10 2022-10-10 Refining method for controlling sulfur of structural steel for aluminum-containing shaft Active CN115612912B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211232456.1A CN115612912B (en) 2022-10-10 2022-10-10 Refining method for controlling sulfur of structural steel for aluminum-containing shaft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211232456.1A CN115612912B (en) 2022-10-10 2022-10-10 Refining method for controlling sulfur of structural steel for aluminum-containing shaft

Publications (2)

Publication Number Publication Date
CN115612912A CN115612912A (en) 2023-01-17
CN115612912B true CN115612912B (en) 2024-03-26

Family

ID=84861032

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211232456.1A Active CN115612912B (en) 2022-10-10 2022-10-10 Refining method for controlling sulfur of structural steel for aluminum-containing shaft

Country Status (1)

Country Link
CN (1) CN115612912B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110079724A (en) * 2019-06-12 2019-08-02 中天钢铁集团有限公司 A kind of Ultra Low-oxygen middle low carbon steel smelting process
CN110205443A (en) * 2019-06-21 2019-09-06 中天钢铁集团有限公司 A kind of siliceous aluminum killed steel Ultra Low-oxygen smelting process of low-carbon
CN111172353A (en) * 2020-01-03 2020-05-19 广东韶钢松山股份有限公司 Method for controlling cleanliness of molten steel and smelting control method for preventing nozzle nodulation in pouring process of sulfur-containing aluminum-containing steel
CN114107595A (en) * 2021-11-03 2022-03-01 中天钢铁集团有限公司 Obtaining solid Al2O3Refining process of inclusions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110079724A (en) * 2019-06-12 2019-08-02 中天钢铁集团有限公司 A kind of Ultra Low-oxygen middle low carbon steel smelting process
CN110205443A (en) * 2019-06-21 2019-09-06 中天钢铁集团有限公司 A kind of siliceous aluminum killed steel Ultra Low-oxygen smelting process of low-carbon
CN111172353A (en) * 2020-01-03 2020-05-19 广东韶钢松山股份有限公司 Method for controlling cleanliness of molten steel and smelting control method for preventing nozzle nodulation in pouring process of sulfur-containing aluminum-containing steel
CN114107595A (en) * 2021-11-03 2022-03-01 中天钢铁集团有限公司 Obtaining solid Al2O3Refining process of inclusions

Also Published As

Publication number Publication date
CN115612912A (en) 2023-01-17

Similar Documents

Publication Publication Date Title
CN110229992B (en) Smelting production method of titanium microalloyed low-cost Q355B steel plate
CN109136466B (en) Method for making steel from sulfur-containing and aluminum-containing steel
CN111172351B (en) Control method for medium-carbon sulfur-containing aluminum deoxidized non-quenched and tempered steel Ds inclusion
CN114085953B (en) Control method for acid dissolution of aluminum in aluminum-containing cold heading steel
CN111910045B (en) Smelting method of high-purity austenitic stainless steel
CN114318154B (en) High-cleanliness welding wire steel L-S3 and preparation method thereof
CN108893682B (en) Die steel billet and preparation method thereof
CN112029961B (en) Aluminum deoxidation method for nitrogen-containing super stainless steel
CN110819896A (en) Smelting method of ultrathin austenitic stainless steel strip for precision calendering
CN112442572A (en) Deoxidation control method for high-end bearing steel inclusion
CN111793772B (en) High-standard bearing steel efficient production process
CN113215476A (en) Method for producing industrial pure iron
CN113943893A (en) Production method of 700 MPa-grade rare earth-containing welding wire steel
CN112708720A (en) Smelting method for improving niobium yield of low-carbon low-silicon niobium-containing steel
CN115404393A (en) Production method of rare earth Ce treated 16MnHIC steel blank for flange
CN114606357A (en) Method for removing phosphorus and leaving carbon in medium-high carbon steel by converter
CN114182156A (en) Production method of low-aluminum carbon structural molten steel
CN112322958A (en) Low-carbon aluminum-containing steel and smelting control method thereof
CN108642239B (en) Method for alloying molten steel silicon and treating calcium by using metal-containing calcium-silicon-iron alloy
CN114737105B (en) Smelting method for producing sulfur-containing steel from low-sulfur molten iron
CN115612912B (en) Refining method for controlling sulfur of structural steel for aluminum-containing shaft
EP3674424B1 (en) Smelting method for ultra-low carbon 13cr stainless steel
CN114150101A (en) Method for producing electroplated tin substrate steel by using ladle casting residual molten steel
CN113913580A (en) Production method of ultralow-carbon low-aluminum structural molten steel
CN115354207B (en) Smelting method of medium carbon alloy structural steel for high-cleanliness ball screw

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
GR01 Patent grant
GR01 Patent grant