CN115491577B - Smelting method for improving cleanliness of steel for automobile hollow stabilizer bar - Google Patents
Smelting method for improving cleanliness of steel for automobile hollow stabilizer bar Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 101
- 239000010959 steel Substances 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000003723 Smelting Methods 0.000 title claims abstract description 34
- 239000003381 stabilizer Substances 0.000 title claims abstract description 26
- 230000003749 cleanliness Effects 0.000 title claims abstract description 11
- 239000002893 slag Substances 0.000 claims abstract description 52
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 49
- 239000011575 calcium Substances 0.000 claims abstract description 28
- 238000007670 refining Methods 0.000 claims abstract description 28
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 24
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000010079 rubber tapping Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 15
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 29
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 29
- 229910052717 sulfur Inorganic materials 0.000 claims description 24
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 20
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 20
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 20
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 13
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 13
- 238000009749 continuous casting Methods 0.000 claims description 13
- 239000004571 lime Substances 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000003223 protective agent Substances 0.000 claims description 10
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 5
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- 238000005275 alloying Methods 0.000 claims description 2
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 10
- 239000001301 oxygen Substances 0.000 abstract description 10
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- 229910000882 Ca alloy Inorganic materials 0.000 abstract description 3
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- 230000000052 comparative effect Effects 0.000 description 26
- 229910052757 nitrogen Inorganic materials 0.000 description 17
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- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 8
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- 230000009286 beneficial effect Effects 0.000 description 2
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- 229910052748 manganese Inorganic materials 0.000 description 2
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- 229910052710 silicon Inorganic materials 0.000 description 2
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- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 2
- 238000009489 vacuum treatment Methods 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
-
- 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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—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
- C21C7/10—Handling in a vacuum
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention belongs to the technical field of steelmaking, and particularly discloses a smelting method for improving the cleanliness of steel for an automobile hollow stabilizer bar, which adopts a BOF + LF + RH + CC process route, wherein a slag making material is added once during converter tapping, low-carbon low-calcium alloy is used in the whole process, the alkalinity of slag is controlled, high-grade powdery silicon carbide is used for making reducing slag, most of inclusions in steel after LF refining are kept as solid oxides, then the solid oxides are removed through RH high-vacuum strong stirring, and ideal denatured inclusions are obtained after a small amount of calcium treatment, so that the purpose of improving the cleanliness of the steel for the automobile hollow stabilizer bar is finally realized at a lower cost, and A-type, B-type and D-type inclusions of the steel can be controlled below 1.0 level, C-type inclusions are controlled below 0 level, and Ds-type inclusions are controlled below 0.5 level; the oxygen content of the finished product can be controlled below 0.0010 percent, and the S content is controlled below 0.005 percent.
Description
Technical Field
The invention belongs to the technical field of steel making, and particularly discloses a smelting method for improving cleanliness of steel for an automobile hollow stabilizer bar.
Background
Automotive stabilizer bars, also known as sway bars or stabilizer bars, are one of the important components of automotive auxiliary-type elastic elements. The stabilizer bar mainly bears the rotation torque in the use process, when the stabilizer bar is stressed, the farther away from the circle center, the larger the rotation torque borne by the stabilizer bar, and the zero torsion torque borne by the stabilizer bar at the circle center, so that the hollow stabilizer bar which is made of advanced high-strength steel and has lighter mass and higher stress is used for replacing the traditional solid stabilizer bar in the automobile industry, the use of the stabilizer bar cannot be greatly influenced, the high strength of the product is ensured, the mass of an automobile body can be effectively reduced, and the effective reduction of the mass of a single part by 20-40 percent is realized.
At present, the manufacturing technology of the hollow stabilizer bar of the automobile is divided into a welded pipe and a seamless pipe, a product adopting the seamless pipe technology has no welding seam, the performance is reliable, the cost is more competitive, but the higher requirement is provided for the internal quality of raw materials. The seamless tube technology production process includes perforation, circle correction, wall reduction, diameter reduction and the like, in the perforation process, metal is ground and expanded into a hole along the contour of a mandril top in a mode of taking axial deformation as a main mode and transverse deformation as an auxiliary mode, the distance between impurities which are distributed in a dispersed mode in the axial direction is gradually reduced and concentrated towards an inner wall area with the maximum deformation, and large impurities are spread into a discontinuous weak surface along the oblique transverse direction. In subsequent rounding, wall reduction and diameter reduction, the hollow pipe is sequentially contracted from outside to inside, and an interlayer containing an inclusion band in an inner wall area cannot be dissociated along with synchronous reduction of the body, so that the defects of bulging, opening breakage, skin warping, inward folding and the like of the inner wall of the hollow pipe can be caused. Therefore, the downstream processing of the steel for the automobile hollow stabilizer bar by adopting the seamless tube process has extremely strict requirements on non-metallic inclusions, and a new process needs to be explored to improve the cleanliness of the hot rolled round steel for the automobile hollow stabilizer bar.
The steel for the hollow stabilizer bar of the automobile is aluminum killed steel, the control of B-type, D-type and Ds-type inclusions is difficult, and the conventional control idea is to adopt low-alkalinity slag or not to carry out calcium treatment so as to reduce the CaO-Al with larger size in molten steel 2 O 3 The steel is liquid inclusion, but the steel grade simultaneously requires that the content of S is less than or equal to 0.005 percent, the low-alkalinity slag is not beneficial to removing sulfur, and certain cost is increased if KR treatment is adopted.
Disclosure of Invention
The invention aims to provide a smelting method for improving cleanliness of steel for an automobile hollow stabilizer bar. By controlling the carbon content at the end point of the converter, tapping double-slag-blocking, using low-carbon low-calcium alloy, adding the slag at the top of the steel ladle at one time during tapping, rapidly heating the LF molten steel after arriving at a station, using high-grade silicon carbide to produce reducing slag, strongly stirring in high vacuum degree by RH and carrying out small amount of calcium treatment, the effect of controlling non-metallic inclusions in the steel can be achieved, and meanwhile, the oxygen content and the sulfur content of the product can be ensured to reach lower levels.
The invention is realized by the following technical scheme:
a smelting method for improving cleanliness of steel for an automobile hollow stabilizer bar comprises the following steps of: c:0.24% -0.28%, si: 0.20-0.30%, mn: 1.20-1.40%, P is less than or equal to 0.020%, S is less than or equal to 0.005%, cr: 0.10-0.18%, ni is less than or equal to 0.20%, cu is less than or equal to 0.10%, al: 0.020-0.050%, ti: 0.020-0.040%, B:0.0015 to 0.0035 percent of the total weight of the alloy, less than or equal to 0.030 percent of As, less than or equal to 0.030 percent of Sn, less than or equal to 0.0012 percent of Ca, less than or equal to 0.0018 percent of O and the balance of Fe.
A smelting method for improving cleanliness of steel for an automobile hollow stabilizer bar comprises the following steps: and carrying out converter primary smelting, LF refining, RH vacuum treatment, continuous casting billet heating, rolling and stacking cooling after rolling on molten iron to obtain the finished steel for the automobile hollow stabilizer bar.
The method comprises the following specific steps:
(1) Converter primary smelting
The content of C at the smelting end point of the converter is controlled to be more than 0.08 percent, a sliding plate and a slag blocking cone are used for combined slag blocking during steel tapping, and primary smelting oxidizing slag is strictly forbidden to enter a steel ladle; adding aluminum for deoxidation during tapping, then adding silicomanganese, low-carbon ferromanganese and low-carbon ferrochromium for alloying, adding lime and furnace protecting agent once again for slagging (the total dosage is 7.5-9 kg/t), and not supplementing slagging materials during LF refining;
(2) LF refining
The LF molten steel is quickly electrified and heated after arriving at a station, high-grade powdery silicon carbide (the SiC content is more than or equal to 74%) is adopted for carrying out slag surface deoxidation, reduced foaming slag rich in CO gas is made to improve the slag desulfurization capacity and the impurity adsorption capacity, and the S content in the steel is controlled to be less than or equal to 0.005%; according to the LF primary sample detection result, silicon manganese, low-carbon ferromanganese and low-carbon ferrochrome are used for fine adjustment of molten steel components, no lime, fluorite and other slag-making materials are added, the content of FeO + MnO in slag is controlled to be below 0.85%, the alkalinity of refining slag is controlled to be 2.5-4.5, and the content of Al in molten steel after LF refining is controlled to be 0.030-0.050%;
(3) RH vacuum degassing
RH promotes the gas flow 96-120 Nm 3 And h, treating for more than or equal to 20min under high vacuum (less than or equal to 67 Pa), feeding titanium iron wires and ferroboron after air breaking, then treating with a small amount of calcium, wherein the dosage of the calcium wires in each furnace is 11.1-25.9 kg, the aluminum wires are not fed, and the soft blowing time is more than or equal to 15min before ladle casting.
(4) Continuous casting
The continuous casting adopts the whole-process protection casting and keeps the constant drawing speed.
The technical scheme principle and the beneficial effects of the invention are as follows:
(1) The low-carbon alloy is used, so that the end point carbon of the converter is improved to the maximum extent, the double slag blocking operation is performed to prevent slag from falling, and the initial oxidability of molten steel is reduced. The slag making material is added once during tapping, the LF slag melting time can be shortened, the high-grade powdery silicon carbide is used for making reducing slag, and a deoxidation product SiO 2 The slag melting can be further promoted when the slag enters the slag, the slag components are optimized, and the content of FeO + MnO in the slag is controlled to beLess than 0.85 percent. Under the conditions of not carrying out KR treatment and not adopting high alkalinity slag, the content of S in the refining molten steel can be controlled to be less than or equal to 0.005 percent. In addition, lower S content may also reduce the generation of class a sulfide inclusions.
(2) The low-calcium alloy is used in the whole process, lime and other slag-making materials are not added in the LF refining process, the content of Ca in the molten steel and the transmission of Ca from the slag to the molten steel can be reduced, and simultaneously, the deoxidation product SiO of silicon carbide 2 The Ca can be promoted to be changed into CaO again to enter the slag, so that most of the inclusions in the steel after LF refining are kept as solid oxides.
(3) After strong stirring in RH high vacuum degree, most of solid oxides can be removed, but a small amount of liquid or semi-liquid CaO-Al with the small size of 1-5 mu m exists 2 O 3 And impurities are contained, and are easy to aggregate and grow in the casting process. As a supplementary control means, a small amount of calcium treatment is carried out on the molten steel after vacuum treatment, on one hand, the castability of the molten steel is ensured, on the other hand, the calcium treatment effect is obviously improved, the obtained high-melting-point inclusions are not easy to deform and extend in the rolling process, and the formation probability of B-type and D-type inclusions is reduced.
(4) The whole continuous casting process protects casting, prevents secondary oxidation of molten steel, maintains constant drawing speed and creates favorable conditions for further floating of various inclusions.
Description of the drawings:
FIG. 1 shows the change of inclusions in molten steel in the smelting process of example 1 (the change rules of examples 2 and 3 are the same);
FIG. 2 shows the change of inclusions in molten steel in the smelting process of comparative example 1;
FIG. 3 shows the change of inclusions in molten steel in the smelting process of comparative example 3;
FIG. 4 shows the change of inclusions in molten steel in the process of smelting in comparative example 5.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but the scope of the present invention is not limited to the above-described embodiments. The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified. Modifications of the above embodiments, which are in accordance with the technical spirit of the present invention, are included in the scope of the present invention.
Example 1
Smelting components of a finished product: c:0.26 percent; si:0.27 percent; mn:1.33%, P:0.013%, S:0.005%, cr:0.15%, ni:0.003%, cu:0.014%, al:0.025%, ti:0.030%, B:0.0021%, as:0.002%, sn:0.002%, ca:0.0006 percent and the balance of Fe.
(1) Smelting in a converter: 130t of converter steel tapping amount, 0.08 percent of end point C content and 0.026 percent of S content, 1.3kg/t of deoxidizer aluminum cake, 1131.3 kg/t of silicomanganese (C is less than or equal to 1.8 percent), 17 percent or more of Si, 65 percent or more of Mn, 0.25 percent or less of P, 0.04 percent or less of S, 0.1 percent or less of water, 1131kg of low-carbon ferromanganese (C is less than or equal to 0.7 percent, 1.5 percent or less of Si, 80 percent or more of Mn, 0.15 percent or less of P, 0.02 percent or less of S, 0.1 percent or less of water), 62kg of low-carbon ferrochromium (C is less than or equal to 0.5 percent, 2.0 percent or less of Si, 55 percent or more of Cr, 96 percent or less of P, 0.03 percent or less of S, 0.1 percent or less of water), 50kg of low-nitrogen carburant (C is more than or equal to 96 percent, 0.030 percent or less of N, 0.04 percent or less than or equal to 0.04 percent of S, 0.5 percent or less of water, 50 kg/t of lime, 3.5kg/t of furnace protecting agent and 8.05kg/t (total adding amount of 8.05 kg/t) are added during steel tapping in turn.
(2) LF refining: heating the molten steel to 1620-1640 ℃, sampling, finely adjusting components according to the components, feeding 169kg of aluminum wire, then adding 240kg of silicon carbide for slag surface deoxidation, and adding 110kg of low-carbon ferromanganese, 107kg of low-carbon ferrochromium and 10kg of low-nitrogen carburant (the components are the same as in the step (1)). And in the last stage of LF, continuously adopting an Al line to adjust the Al content in the molten steel to be 0.043%. The composition of the refining slag is shown in Table 2, and the S content in the LF outgoing molten steel is 0.005%.
(3) RH vacuum degassing: lift gas flow 100Nm 3 Perh, ultimate vacuum degree of 60Pa, high vacuum retention time of 22min, sampling and detecting components after breaking the air, feeding 30kg of ferrotitanium wire, then adding 20kg of ferroboron, then feeding 18.5kg of calcium wire, not feeding aluminum wire, and carrying out steel casting after soft blowing for 23 min.
(4) Continuous casting: the whole process is protected and cast, and the constant drawing speed is 0.85m/min.
The steel prepared in example 1 is subjected to non-metallic inclusion detection by GB/T10561 Standard A method, and the grade is as follows: grade A is 0.5, grade A is 0.0, grade B is less than or equal to 1.0, grade B is less than or equal to 0.0, grade C is less than or equal to 0.0, grade D is less than or equal to 1.0, grade D is less than or equal to 0.5, and grade Ds is less than or equal to 0.5. The S content of the finished product is 0.005 percent, and the oxygen content of the rolled material is 0.0008 percent.
Example 2
Smelting components of a finished product: c:0.26 percent; si:0.26 percent; mn:1.34%, P:0.013%, S:0.005%, cr:0.15%, ni:0.003%, cu:0.014%, al:0.025%, ti:0.029%, B:0.0022%, as:0.002%, sn:0.002%, ca:0.0006 percent and the balance of Fe.
(1) Smelting in a converter: 130t of converter steel output, 0.08 percent of end point C content and 0.026 percent of S content, 1.3kg/t of deoxidizer aluminum cake, 1135kg of silicon-manganese alloy (C is less than or equal to 1.8 percent, si is less than or equal to 17 percent, mn is more than or equal to 65 percent, P is less than or equal to 0.25 percent, S is less than or equal to 0.04 percent, and water is less than or equal to 0.1 percent) are added during steel output in sequence, 62kg of low-carbon ferrochromium (C is less than or equal to 0.5 percent, si is less than or equal to 2.0 percent, cr is more than or equal to 55 percent, P is less than or equal to 0.04 percent, S is less than or equal to 0.15 percent, S is less than or equal to 0.02 percent, and water is less than or equal to 0.1 percent), 50kg of low-nitrogen carburant (C is more than or equal to 96 percent, N is less than or equal to 0.030 percent, S is less than or equal to 0.04 percent, water is less than or equal to 0.5 percent, and 50 kg/t, and 3.5kg/t of lime and 4.55kg/t of furnace protecting agent (total adding amount of 8.05 kg/t).
(2) LF refining: heating the molten steel to 1620-1640 ℃, sampling, finely adjusting components according to the components, feeding 169kg of aluminum wire, then adding 240kg of silicon carbide for slag surface deoxidation, and adding 110kg of low-carbon ferromanganese, 107kg of low-carbon ferrochromium and 10kg of low-nitrogen carburant (the components are the same as in the step (1)). And in the last stage of LF, continuously adopting an Al line to adjust the Al content in the molten steel to be 0.043%. The composition of the refining slag is shown in Table 2, and the content of S in the LF outlet molten steel is 0.005%.
(3) RH vacuum degassing: lift gas flow 100Nm 3 Perh, ultimate vacuum degree of 60Pa, high vacuum retention time of 22min, sampling and detecting components after breaking the air, feeding 30kg of ferrotitanium wire, then adding 20kg of ferroboron, then feeding 18.5kg of calcium wire, not feeding aluminum wire, and carrying out steel casting after soft blowing for 23 min.
(4) Continuous casting: the whole process is protected and cast, and the constant drawing speed is 0.85m/min.
The steel prepared in the example 2 is subjected to non-metallic inclusion detection by a GB/T10561 standard A method, and the grade is as follows: grade A is 0.5, grade A is 0.0, grade B is less than or equal to 1.0, grade B is less than or equal to 0.0, grade C is less than or equal to 0.0, grade D is less than or equal to 1.0, grade D is less than or equal to 0.5, and grade Ds is less than or equal to 0.5. The S content of the finished product is 0.005 percent, and the oxygen content of the rolled material is 0.0009 percent.
Example 3
Smelting components of a finished product: c:0.26 percent; si:0.27 percent; mn:1.33%, P:0.013%, S:0.005%, cr:0.15%, ni:0.003%, cu:0.014%, al:0.025%, ti:0.030%, B:0.0021%, as:0.002%, sn:0.002%, ca:0.0006 percent and the balance of Fe.
(1) Smelting in a converter: 130t of converter steel output, 0.08 percent of end point C content and 0.026 percent of S content, 1.3kg/t of deoxidizer aluminum cake, 1131 kg/t of silicon-manganese alloy (less than or equal to 1.8 percent of C, less than or equal to 17 percent of Si, more than or equal to 65 percent of Mn, less than or equal to 0.25 percent of P, less than or equal to 0.04 percent of S and less than or equal to 0.1 percent of water), 1131kg of low-carbon ferromanganese (less than or equal to 0.7 percent of C, less than or equal to 1.5 percent of Si, more than or equal to 80 percent of Mn, less than or equal to 0.15 percent of P, less than or equal to 0.02 percent of S and less than or equal to 0.1 percent of water), 62kg of low-carbon-containing agent (more than or equal to 96 percent of C, less than or equal to 0.030 percent of N, less than or equal to 0.04 percent of S and less than or equal to 0.5 percent of water, 50 kg/t of low-nitrogen carburant, and 4.3kg/t of lime and 4.55kg/t of furnace protecting agent (8.85 kg/t of total added amount of added.
(2) LF refining: heating the molten steel to 1620-1640 ℃, sampling, finely adjusting components according to the components, feeding 169kg of aluminum wire, then adding 240kg of silicon carbide for slag surface deoxidation, and adding 110kg of low-carbon ferromanganese, 107kg of low-carbon ferrochromium and 10kg of low-nitrogen carburant (the components are the same as in the step (1)). And in the last stage of LF, continuously adopting an Al line to adjust the Al content in the molten steel to be 0.043%. The composition of the refining slag is shown in Table 2, and the S content in the LF outgoing molten steel is 0.005%.
(3) RH vacuum degassing: lift gas flow 100Nm 3 Perh, ultimate vacuum degree of 60Pa, high vacuum retention time of 22min, sampling and detecting components after breaking the air, feeding 30kg of ferrotitanium wire, then adding 20kg of ferroboron, then feeding 18.5kg of calcium wire, not feeding aluminum wire, and carrying out steel casting after soft blowing for 23 min.
(4) Continuous casting: the whole process is protected and cast, and the constant drawing speed is 0.85m/min.
The steel prepared in the example 3 is subjected to non-metallic inclusion detection by a GB/T10561 standard A method, and the grade is as follows: grade A is 0.5, grade A is 0.0, grade B is less than or equal to 1.0, grade B is less than or equal to 0.5, grade C is less than or equal to 0.0, grade D is less than or equal to 1.0, grade D is less than or equal to 0.5, and grade Ds is less than or equal to 0.5. The S content of the finished product is 0.005 percent, and the oxygen content of the rolled material is 0.0009 percent.
Comparative example 1
The tapped slag amount and the LF-added slag charge of comparative example 1 were different from those of the examples, and the remaining operations were substantially the same as those of example 1.
Smelting components of a finished product: c:0.26 percent; si:0.27 percent; mn:1.33%, P:0.013%, S:0.005%, cr:0.15%, ni:0.003%, cu:0.014%, al:0.025%, ti:0.030%, B:0.0021%, as:0.002%, sn:0.002%, ca:0.0006 percent and the balance of Fe.
(1) Smelting in a converter: 130t of converter steel tapping amount, 0.08 percent of end point C content and 0.026 percent of S content, 1.3kg/t of deoxidizer aluminum cake, 1131kg of silicon-manganese alloy, 1192kg of low-carbon ferromanganese, 62kg of low-carbon ferrochrome, 50kg of low-nitrogen carburant, 2.5kg/t of lime and 4.55kg/t of furnace protecting agent (the total adding amount is 7.05 kg/t) are added in sequence during steel tapping.
(2) LF refining: heating the molten steel to 1620-1640 ℃, sampling, finely adjusting components according to the components, adding 1.8kg/t of lime, feeding 169kg of aluminum wire, adding 240kg of silicon carbide for slag surface deoxidation, and adding 110kg of low-carbon ferromanganese, 107kg of low-carbon ferrochrome and 10kg of low-nitrogen carburant (the components are the same as in the step (1)). And in the final stage of LF, al wires are continuously adopted to adjust the Al content in the molten steel to be 0.043%. The composition of the refining slag is shown in Table 2, and the content of S in the LF outlet molten steel is 0.005%.
(3) RH vacuum degassing: lift gas flow 100Nm 3 Perh, ultimate vacuum degree of 60Pa, high vacuum retention time of 22min, sampling and detecting components after breaking the air, feeding 30kg of ferrotitanium wire, then adding 20kg of ferroboron, then feeding 18.5kg of calcium wire, not feeding aluminum wire, and carrying out steel casting after soft blowing for 23 min.
(4) Continuous casting: the whole process is protected and cast, and the constant drawing speed is 0.85m/min.
The steel prepared in the comparative example 1 is subjected to non-metallic inclusion detection by a GB/T10561 standard A method, and the grade is as follows: grade A is 0.5, grade A is 0.0, grade B is less than or equal to 1.5, grade B is less than or equal to 1.0, grade C is less than or equal to 0.0, grade D is less than or equal to 1.5, grade D is less than or equal to 1.0, and grade Ds is less than or equal to 1.5. The S content of the finished product is 0.005 percent, and the oxygen content of the rolled material is 0.0009 percent.
Comparative example 2
The LF deoxidizer of comparative example 2 is different from that of example, and the rest of the operation is substantially the same as that of example 1.
Smelting components of a finished product: c:0.26 percent; si:0.27 percent; mn:1.33%, P:0.013%, S:0.005%, cr:0.15%, ni:0.003%, cu:0.014%, al:0.025%, ti:0.030%, B:0.0021%, as:0.002%, sn:0.002%, ca:0.0006 percent and the balance of Fe.
(1) Smelting in a converter: 130t of converter steel tapping amount, 0.08 percent of end point C content and 0.026 percent of S content, 1.3kg/t of deoxidizer aluminum cake, 1131kg of silicon-manganese alloy, 1192kg of low-carbon ferromanganese, 62kg of low-carbon ferrochrome, 50kg of low-nitrogen carburant, 3.5kg/t of lime and 4.55kg/t of furnace protecting agent (the total adding amount is 8.05 kg/t) are added in sequence during steel tapping.
(2) LF refining: heating the molten steel to 1620-1640 ℃, sampling, finely adjusting components according to the components, feeding 169kg of aluminum wire, and then adding 240kg of calcium carbide (CaC) 2 More than or equal to 70 percent) of the slag surface is deoxidized, and 110kg of low-carbon ferromanganese, 107kg of low-carbon ferrochrome and 10kg of low-nitrogen carburant are added (the components are the same as in the step (1)). And in the last stage of LF, continuously adopting an Al line to adjust the Al content in the molten steel to be 0.043%. The composition of the refining slag is shown in Table 2, and the content of S in the LF outlet molten steel is 0.005%.
(3) RH vacuum degassing: lift gas flow 100Nm 3 Perh, ultimate vacuum degree of 60Pa, high vacuum retention time of 22min, sampling and detecting components after breaking the air, feeding 30kg of ferrotitanium wire, then adding 20kg of ferroboron, then feeding 18.5kg of calcium wire, not feeding aluminum wire, and carrying out steel casting after soft blowing for 23 min.
(4) Continuous casting: the whole process is protected and cast, and the constant drawing speed is 0.85m/min.
The steel prepared in the comparative example 2 is subjected to non-metallic inclusion detection by a GB/T10561 standard A method, and the grade is as follows: grade A is 0.5, grade A is 0.0, grade B is less than or equal to 1.0, grade B is less than or equal to 0.5, grade C is less than or equal to 0.0, grade D is less than or equal to 1.5, grade D is less than or equal to 1.0, and grade Ds is less than or equal to 1.5. The S content of the finished product is 0.005 percent, and the oxygen content of the rolled material is 0.0008 percent.
Comparative example 3
The RH lift gas flow rate of comparative example 3 is different from that of example, and the rest of the operation is substantially the same as that of example 1.
Smelting components of a finished product: c:0.26 percent; si:0.27 percent; mn:1.33%, P:0.013%, S:0.005%, cr:0.15%, ni:0.003%, cu:0.014%, al:0.025%, ti:0.030%, B:0.0021%, as:0.002%, sn:0.002%, ca:0.0006 percent and the balance of Fe.
(1) Smelting in a converter: 130t of converter steel tapping amount, 0.08 percent of end point C content and 0.026 percent of S content, 1.3kg/t of deoxidizer aluminum cake, 1131kg of silicon-manganese alloy, 1192kg of low-carbon ferromanganese, 62kg of low-carbon ferrochrome, 50kg of low-nitrogen carburant, 3.5kg/t of lime and 4.55kg/t of furnace protecting agent (the total adding amount is 8.05 kg/t) are added in sequence during steel tapping.
(2) LF refining: heating the molten steel to 1620-1640 ℃, sampling, finely adjusting components according to the components, feeding 169kg of aluminum wire, then adding 240kg of silicon carbide for slag surface deoxidation, and adding 110kg of low-carbon ferromanganese, 107kg of low-carbon ferrochromium and 10kg of low-nitrogen carburant (the components are the same as in the step (1)). And in the last stage of LF, continuously adopting an Al line to adjust the Al content in the molten steel to be 0.043%. The composition of the refining slag is shown in Table 2, and the content of S in the LF outlet molten steel is 0.005%.
(3) RH vacuum degassing: lift gas flow 80Nm 3 Perh, ultimate vacuum degree of 60Pa, high vacuum retention time of 22min, sampling and detecting components after breaking the air, feeding 30kg of ferrotitanium wire, then adding 20kg of ferroboron, then feeding 18.5kg of calcium wire, not feeding aluminum wire, and carrying out steel casting after soft blowing for 23 min.
(4) Continuous casting: the whole process is protected and cast, and the constant drawing speed is 0.85m/min.
The steel prepared in the comparative example 3 is subjected to non-metallic inclusion detection by a GB/T10561 standard A method, and the grade is as follows: grade A is 1.0, grade A is 0.0, grade B is less than or equal to 1.5, grade C is less than or equal to 0.0, grade D is less than or equal to 1.0 and grade Ds is less than or equal to 1.0. The S content of the finished product is 0.005 percent, and the oxygen content of the rolled material is 0.0010 percent.
Comparative example 4
The calcium treatment operation (without calcium treatment) of comparative example 4 was different from that of example 1, and the remaining operation was substantially the same as that of example.
Smelting components of a finished product: c:0.26 percent; si:0.27 percent; mn:1.33%, P:0.013%, S:0.005%, cr:0.15%, ni:0.003%, cu:0.014%, al:0.025%, ti:0.030%, B:0.0021%, as:0.002%, sn:0.002%, ca:0.0003 percent and the balance of Fe.
(1) Smelting in a converter: 130t of converter steel tapping amount, 0.08 percent of end point C content and 0.026 percent of S content, 1.3kg/t of deoxidizer aluminum cake, 1131kg of silicon-manganese alloy, 1192kg of low-carbon ferromanganese, 62kg of low-carbon ferrochrome, 50kg of low-nitrogen carburant, 3.5kg/t of lime and 4.55kg/t of furnace protecting agent (the total adding amount is 8.05 kg/t) are added in sequence during steel tapping.
(2) LF refining: heating the molten steel to 1620-1640 ℃, sampling, feeding 169kg of aluminum wires according to the fine adjustment of components, then adding 240kg of silicon carbide for slag surface deoxidation, and adding 110kg of low-carbon ferromanganese, 107kg of low-carbon ferrochromium and 10kg of low-nitrogen carburant. And in the last stage of LF, continuously adopting an Al line to adjust the Al content in the molten steel to be 0.043%. The composition of the refining slag is shown in Table 2, and the content of S in the LF outlet molten steel is 0.005%.
(3) RH vacuum degassing: increasing the gas flow rate by 100Nm 3 H, the ultimate vacuum degree is 60Pa, the high vacuum is kept for 22min, sampling is carried out after the vacuum breaking, components are detected, 30kg of ferrotitanium wire is fed, 20kg of ferroboron is added, calcium treatment is not carried out, the aluminum wire is not fed, and steel is fed and cast after soft blowing for 23 min.
(4) Continuous casting: the whole process is protected and cast, and the constant drawing speed is 0.85m/min.
The steel prepared in the comparative example 4 is subjected to non-metallic inclusion detection by a GB/T10561 standard A method, and the grade is as follows: grade A is 1.0, grade A is 0.0, grade B is less than or equal to 2.0, grade B is less than or equal to 1.0, grade C is less than or equal to 0.0, grade D is less than or equal to 1.5, grade D is less than or equal to 1.0, and grade Ds is less than or equal to 1.0. The S content of the finished product is 0.005 percent, and the oxygen content of the rolled material is 0.0008 percent.
Comparative example 5
The calcium treatment operation (excess calcium treatment) of comparative example 5 was different from that of example, and the rest of the operation was substantially the same as that of example 1.
Smelting components of a finished product: c:0.26 percent; si:0.27 percent; mn:1.33%, P:0.013%, S:0.005%, cr:0.15%, ni:0.003%, cu:0.014%, al:0.025%, ti:0.030%, B:0.0021%, as:0.002%, sn:0.002%, ca:0.0010 percent and the balance of Fe.
(1) Smelting in a converter: 130t of converter steel tapping amount, 0.08 percent of end point C content and 0.026 percent of S content, 1.3kg/t of deoxidizer aluminum cake, 1131kg of silicon-manganese alloy, 1192kg of low-carbon ferromanganese, 62kg of low-carbon ferrochrome, 50kg of low-nitrogen carburant, 3.5kg/t of lime and 4.55kg/t of furnace protecting agent (the total adding amount is 8.05 kg/t) are added in sequence during steel tapping.
(2) LF refining: heating the molten steel to 1620-1640 ℃, sampling, feeding 169kg of aluminum wires according to the fine adjustment of components, then adding 240kg of silicon carbide for slag surface deoxidation, and adding 110kg of low-carbon ferromanganese, 107kg of low-carbon ferrochromium and 10kg of low-nitrogen carburant. And in the last stage of LF, continuously adopting an Al line to adjust the Al content in the molten steel to be 0.043%. The composition of the refining slag is shown in Table 2, and the content of S in the LF outlet molten steel is 0.005%.
(3) RH vacuum degassing: lift gas flow 100Nm 3 Perh, ultimate vacuum degree of 60Pa, high vacuum retention time of 22min, sampling and detecting components after breaking the air, feeding 30kg of ferrotitanium wire, then adding 20kg of ferroboron, then feeding 27.5kg of calcium wire, not feeding aluminum wire, and carrying out steel casting after soft blowing for 23 min.
(4) Continuous casting: the whole process is protected and cast, and the constant drawing speed is 0.85m/min.
The steel prepared in the comparative example 5 is subjected to non-metallic inclusion detection by a GB/T10561 standard A method, and the grade is as follows: grade A is 0.5, grade A is 0.0, grade B is less than or equal to 1.0, grade B is less than or equal to 0.5, grade C is less than or equal to 0.0, grade D is less than or equal to 1.5, grade D is less than or equal to 1.0, and grade Ds is less than or equal to 1.5. The S content of the finished product is 0.005 percent, and the oxygen content of the rolled material is 0.0009 percent.
TABLE 1 examples and comparative examples chemical compositions
| Categories | C/％ | Si/％ | Mn/％ | P/％ | S/％ | Cr/％ | Al/％ | Ti/％ | B/％ | Ca/％ |
| Example 1 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0006 |
| Example 2 | 0.26 | 0.26 | 1.34 | 0.013 | 0.005 | 0.15 | 0.025 | 0.029 | 0.0022 | 0.0006 |
| Example 3 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0006 |
| Comparative example 1 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0006 |
| Comparative example 2 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0006 |
| Comparative example 3 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0006 |
| Comparative example 4 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0003 |
| Comparative example 5 | 0.26 | 0.27 | 1.33 | 0.013 | 0.005 | 0.15 | 0.025 | 0.030 | 0.0021 | 0.0010 |
TABLE 2 detailed Process for each example and comparative example
TABLE 3 non-metallic inclusions, O content and fatigue life of finished products in examples and comparative examples
Claims (3)
1. A smelting method for improving cleanliness of steel for an automobile hollow stabilizer bar is characterized by comprising the following steps:
(1) Controlling the content of C at the smelting end point of the converter to be more than 0.08 percent, and using a sliding plate and a slag stopping cone to stop slag during tapping;
(2) Adding aluminum for deoxidation during converter tapping, then adding silicomanganese, low-carbon ferromanganese and low-carbon ferrochrome for alloying, adding lime and furnace protecting agent with the total amount of 7.5-9 kg/t for slagging once, and not supplementing slag-making materials in the LF refining process;
(3) Rapidly electrifying and heating LF molten steel after arriving at a station, deoxidizing the slag surface by adopting powdery silicon carbide with the SiC content of more than or equal to 74 percent, making reduced foaming slag rich in CO gas, controlling the S content in the steel to be less than or equal to 0.005 percent, using fine adjustment components of silicomanganese, low-carbon ferromanganese and low-carbon ferrochromium, controlling the FeO and MnO contents in the slag to be less than 0.85 percent, controlling the alkalinity of refining slag to be 2.5-4.5, and controlling the Al content in the molten steel after the refining to be 0.030-0.050 percent;
(4) RH lifting gas flow rate of 96-120 Nm 3 H, high vacuum position less than or equal to 67PaThe treatment time is more than or equal to 20min, titanium iron wires are fed firstly after the air is broken, ferroboron is added, then a small amount of calcium treatment is carried out, the dosage of the calcium wires in each furnace is 11.1-25.9 kg, aluminum wires are not fed, and the materials are stirred for more than 15min and then are subjected to ladle casting;
(5) The continuous casting adopts the whole-process protection casting and keeps constant drawing speed.
2. The smelting method for improving the cleanliness of the steel for the automobile hollow stabilizer bar according to claim 1, wherein silicomanganese, low-carbon ferromanganese and low-carbon ferrochrome used in the steps (2) and (3) are low-carbon low-calcium content alloys.
3. The steel for the automobile hollow stabilizer bar smelted according to the method of claim 1, wherein the steel for the automobile hollow stabilizer bar comprises the following components in percentage by mass: c:0.24% -0.28%, si: 0.20-0.30%, mn: 1.20-1.40%, P is less than or equal to 0.020%, S is less than or equal to 0.005%, cr: 0.10-0.18%, ni is less than or equal to 0.20%, cu is less than or equal to 0.10%, al: 0.020-0.050%, ti:0.020% -0.040%, B:0.0015 to 0.0035 percent of the total weight of the alloy, less than or equal to 0.030 percent of As, less than or equal to 0.030 percent of Sn, less than or equal to 0.0012 percent of Ca, less than or equal to 0.0018 percent of O and the balance of Fe.
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Patent Citations (4)
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| JP2008248323A (en) * | 2007-03-30 | 2008-10-16 | Sanyo Special Steel Co Ltd | METHOD FOR MANUFACTURING HIGH Ni-Fe ALLOY STEEL CONTAINING EXTREMELY LOW Si EXTREMELY LOW C AND EXTREMELY LOW S |
| CN110846581A (en) * | 2019-12-05 | 2020-02-28 | 中天钢铁集团有限公司 | Smelting method for realizing ultrahigh purity of bearing steel by controlling alkalinity of furnace slag and combining electromagnetic stirring of tundish |
| CN112143852A (en) * | 2020-08-24 | 2020-12-29 | 南京钢铁股份有限公司 | Smelting preparation method of high-cleanliness titanium-containing steel grade |
| CN114107595A (en) * | 2021-11-03 | 2022-03-01 | 中天钢铁集团有限公司 | Obtaining solid Al2O3Refining process of inclusions |
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