CN118007014A - Low-carbon emission smelting method for superfine wiredrawing clean steel - Google Patents
Low-carbon emission smelting method for superfine wiredrawing clean steel Download PDFInfo
- Publication number
- CN118007014A CN118007014A CN202410157597.4A CN202410157597A CN118007014A CN 118007014 A CN118007014 A CN 118007014A CN 202410157597 A CN202410157597 A CN 202410157597A CN 118007014 A CN118007014 A CN 118007014A
- Authority
- CN
- China
- Prior art keywords
- equal
- less
- percent
- steel
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 132
- 239000010959 steel Substances 0.000 title claims abstract description 132
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 45
- 238000003723 Smelting Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005491 wire drawing Methods 0.000 title claims abstract description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000010079 rubber tapping Methods 0.000 claims abstract description 43
- 238000003756 stirring Methods 0.000 claims abstract description 37
- 229910052742 iron Inorganic materials 0.000 claims abstract description 23
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 18
- 239000000956 alloy Substances 0.000 claims abstract description 18
- 238000007670 refining Methods 0.000 claims abstract description 18
- 238000009749 continuous casting Methods 0.000 claims abstract description 15
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 13
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 11
- 230000023556 desulfurization Effects 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002699 waste material Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000005498 polishing Methods 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 84
- 238000007664 blowing Methods 0.000 claims description 43
- 239000002893 slag Substances 0.000 claims description 43
- 229910052786 argon Inorganic materials 0.000 claims description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 20
- 239000010936 titanium Substances 0.000 claims description 20
- 229910052719 titanium Inorganic materials 0.000 claims description 20
- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 10
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims description 9
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 229910052758 niobium Inorganic materials 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 229910052718 tin Inorganic materials 0.000 claims description 9
- 229910052720 vanadium Inorganic materials 0.000 claims description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 8
- 239000004571 lime Substances 0.000 claims description 8
- 238000007872 degassing Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 2
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 238000009847 ladle furnace Methods 0.000 description 14
- 239000007788 liquid Substances 0.000 description 13
- 239000003795 chemical substances by application Substances 0.000 description 9
- 238000005266 casting Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000000498 cooling water Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000009842 primary steelmaking Methods 0.000 description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- -1 cleanliness Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 235000012431 wafers Nutrition 0.000 description 1
Classifications
-
- 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a low-carbon emission smelting method for superfine wire drawing clean steel, and belongs to the technical field of smelting. The method comprises the steps of firstly, performing deep desulfurization treatment on molten iron; step two, mixing the waste steel and the molten iron in the step one according to a certain proportion to form waste molten steel, and smelting in an electric furnace; thirdly, tapping by an electric furnace, and adding alloy when the tapping amount reaches 15 t; step four, transferring the scrap steel water added with the alloy in the step three into an LF refining furnace for refining, wherein the LF refining adopts staged feeding and stirring treatment; and fifthly, carrying out RH vacuum treatment on the LF refined steel scraps in the fourth step, tapping, and carrying out subsequent continuous casting, polishing and rolling. The low-carbon emission smelting method for the superfine wiredrawing clean steel reduces carbon dioxide emission so as to meet the requirements of low-carbon green products and improve the product quality.
Description
Technical Field
The invention provides a low-carbon emission smelting method for superfine wire drawing clean steel, and belongs to the technical field of smelting.
Background
The superfine clean steel for wiredrawing mainly comprises products such as cutting steel wires and steel cords, wherein the cutting steel wires are mainly used for cutting silicon wafers and used for processing in the field of semiconductors, and the current consumption is relatively low. Steel cords are common rubber skeleton materials and are widely applied to radial tires of various automobiles, trucks and airplanes.
In the production process of the steel cord, a cord steel wire rod with the diameter of 5.5mm is required to be drawn into filaments with the diameter of 0.15-0.40 mm, and the cutting steel wire is required to be drawn to be below 0.10mm, and the elongation is above 1000 times, so that high requirements are put on the internal and external quality of the wire rod, and particularly high requirements are put on the content of residual elements of molten steel, cleanliness, gas and the like.
In order to ensure that the cord steel wire rod has excellent cleanliness, residual elements and gas control level, the metallurgical field at present adopts a smelting combination of a blast furnace and a converter, but the blast furnace smelting needs raw materials such as coke and the like, has long smelting period and high carbon emission level, and is not environment-friendly;
The clean steel is produced by adopting an electric furnace smelting process, and the problems of high residual elements and gases and unstable steel quality exist. The main reason is that the control of nitrogen in the electric furnace steelmaking process is a difficult point, firstly, nitrogen accounting for 3/4 of the air volume is dissociated under the action of electric arc to dissolve into steel; secondly, part of nitrogen is also carried in the scrap steel. On the other hand, after the scrap steel is recycled for many times, the residual Cr, ni, cu and other elements are higher, the residual elements are easy to exceed the standard requirements when the scrap steel is added into an electric furnace for smelting, and the current general mode is to dilute the whole molten steel by adding molten iron so as to reduce the content of the residual elements, but correspondingly reduce the proportion of the scrap steel, thereby increasing the carbon emission.
Disclosure of Invention
The invention provides a low-carbon emission smelting method for superfine wire drawing clean steel aiming at the problems, and solves the problem that the product quality is reduced due to the fact that the content of residual elements is difficult to control in the preparation process of the superfine wire drawing clean steel.
A low-carbon emission smelting method for superfine wire drawing clean steel adopts scrap steel for smelting processing;
step one, carrying out deep desulfurization treatment on molten iron;
step two, mixing the waste steel and the molten iron in the step one according to a certain proportion to form waste molten steel, and smelting in an electric furnace;
thirdly, tapping by an electric furnace, and adding alloy when the tapping amount reaches 15 t;
Step four, transferring the scrap steel water added with the alloy in the step three into an LF refining furnace for refining, wherein the LF refining adopts staged feeding and stirring treatment;
and fifthly, carrying out RH vacuum treatment on the LF refined steel scraps in the fourth step, tapping, and carrying out subsequent continuous casting, polishing and rolling.
In the low-carbon emission smelting method for superfine wiredrawing clean steel, in the first step, molten iron is subjected to deep desulfurization treatment, and the content of S in the desulfurized molten iron is less than or equal to 0.005%; the temperature of the molten iron after desulfurization is not lower than 1250 ℃.
The invention relates to a low-carbon emission smelting method for superfine wire drawing clean steel, wherein in the second step, before molten iron is added into the steel, the steel is classified according to the steel scrap ratio of 100%, the steel scrap ratio of 70% and the steel scrap ratio of more than 50%, and the concrete classification is as follows:
Elemental residue control with scrap ratio of 100%: cr is less than or equal to 0.06 percent, ni is less than or equal to 0.06 percent, cu is less than or equal to 0.05 percent, mo is less than or equal to 0.01 percent, ti is less than or equal to 0.05 percent, sn is less than or equal to 0.015 percent, nb is less than or equal to 0.005 percent, V is less than or equal to 0.05 percent, al is less than or equal to 0.05 percent, and S is less than or equal to 0.006 percent;
Element residue control with scrap ratio of 70%: less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Ni, less than or equal to 0.07 percent of Cu, less than or equal to 0.015 percent of Mo, less than or equal to 0.1 percent of Ti, less than or equal to 0.015 percent of Sn, less than or equal to 0.01 percent of Nb, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Al, and less than or equal to 0.01 percent of S;
Element residue control with scrap ratio of more than 50 percent: less than or equal to 0.15 percent of Cr, less than or equal to 0.1 percent of Ni, less than or equal to 0.1 percent of Cu, less than or equal to 0.02 percent of Mo, less than or equal to 0.1 percent of Ti, less than or equal to 0.015 percent of Sn, less than or equal to 0.01 percent of Nb, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Al, and less than or equal to 0.015 percent of S.
The invention relates to a low-carbon emission smelting method for superfine wiredrawing clean steel, wherein in the third step, when the tapping amount reaches 15t, alloys are added in the following sequence: 1/3 low nitrogen carburant, low titanium low aluminum ferrosilicon, low carbon ferromanganese, 2/3 low nitrogen carburant, lime and special synthetic slag for cord steel.
The low-carbon emission smelting method for superfine wiredrawing clean steel is characterized by comprising the following steps of: the lime addition amount is controlled to be 0.8kg/t, the synthetic slag addition amount is controlled to be 10kg/t, and the alkalinity is controlled to be 0.8-1.1.
The low-carbon emission smelting method for superfine wire drawing clean steel comprises the following steps of feeding and stirring in stages in LF refining:
(1) Firstly, switching on and starting bottom blowing argon after adding alloy thick scrap molten steel into place, and then electrifying and heating;
(2) Taking a first molten steel sample after argon is blown from the bottom for 5-8min, and continuing to open the bottom for blowing; the connection stage is B1;
(3) Supplementing alloy and carbon powder according to B1 stage sampling, and powering on to quickly remove slag; the connection stage is B2;
(4) Rapidly reducing ladle bottom blowing and performing pre-soft stirring after the molten steel components, slag melting and temperature reach standards;
(5) And switching to a soft stirring mode after the front soft stirring is finished, and tapping after the soft stirring is finished.
According to the low-carbon emission smelting method for the superfine wiredrawing clean steel, the argon flow is 350-450NL/min during the argon bottom blowing process in the step (1);
(2) Controlling the flow rate of bottom blowing argon to be 500-600NL/min;
(4) The flow rate of soft stirring before the step is 100-150NL/min, and the time is more than 8min;
(5) In the step, the soft stirring mode time is more than or equal to 25min, and the flow is less than 100NL/min.
The invention relates to a low-carbon emission smelting method for superfine wire drawing clean steel, which comprises the following steps of vacuum degree of RH vacuum treatment not more than 2mbar, degassing time not less than 15 minutes and clean circulation time not less than 8 minutes.
Advantageous effects
The low-carbon emission smelting method for the superfine wiredrawing clean steel reduces carbon dioxide emission so as to meet the requirements of low-carbon green products and improve the product quality.
The invention provides the adopted low-carbon emission smelting method for the superfine wiredrawing clean steel, and the scrap steel components are classified so as to ensure that the requirements of residual elements of steel types are met under the condition of different scrap steel ratios. Optimizing the end-point control of the primary smelting furnace and tapping deoxidation, ensuring that the oxygen content is lower than 8ppm, simultaneously adding special synthetic slag in electric furnace tapping, ensuring that the refining is finished in advance, ensuring that slag steel reaction tends to balance, ensuring inclusion denaturation, further reducing gas components in steel through the RH treatment, and simultaneously reducing inclusions in steel. The continuous casting adopts constant temperature and constant pulling speed casting, and the continuous casting strong cooling technology controls the segregation of the continuous casting blank.
According to the low-carbon emission smelting method for the superfine wire drawing clean steel, the adopted alloy charging sequence is that a small amount of carburant is added in the electric furnace tapping process to deoxidize primary steelmaking water, carbon deoxidization products are CO gas which cannot enter molten steel to form inclusion, and meanwhile, the yield of low-titanium low-aluminum silicon iron and low-carbon ferromanganese can be improved.
The low-carbon emission smelting method for superfine wire drawing clean steel can ensure that the inclusion control level of the steel is ensured under the condition of high scrap ratio, and the wire drawing to below 0.4mm is ensured not to be broken due to the inclusion.
Drawings
Fig. 1 is a schematic diagram of the LF refining staged addition and agitation staging of the present invention.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
The low-carbon emission smelting method for the superfine wiredrawing clean steel comprises the following specific steps:
1. KR desulfurization: the deep desulfurization of the molten iron is required, the S% of the desulfurized molten iron is less than or equal to 0.005%, and the slag skimming is clean. The temperature of the molten iron after desulfurization is not lower than 1250 ℃.
2. Smelting in an electric furnace:
The scrap steel is classified, different scrap steel is adopted according to different scrap steel ratios, and the specific requirements are as follows:
Scrap ratio 100%: less than or equal to 0.06 percent of Cr, less than or equal to 0.06 percent of Ni, less than or equal to 0.05 percent of Cu, less than or equal to 0.01 percent of Mo, less than or equal to 0.05 percent of Ti, less than or equal to 0.015 percent of Sn, less than or equal to 0.005 percent of Nb, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Al, and less than or equal to 0.006 percent of S.
Scrap steel ratio of more than 70 percent: less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Ni, less than or equal to 0.07 percent of Cu, less than or equal to 0.015 percent of Mo, less than or equal to 0.1 percent of Ti, less than or equal to 0.015 percent of Sn, less than or equal to 0.01 percent of Nb, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Al, and less than or equal to 0.01 percent of S.
Scrap steel ratio of more than 50 percent: less than or equal to 0.15 percent of Cr, less than or equal to 0.1 percent of Ni, less than or equal to 0.1 percent of Cu, less than or equal to 0.02 percent of Mo, less than or equal to 0.1 percent of Ti, less than or equal to 0.015 percent of Sn, less than or equal to 0.01 percent of Nb, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Al, and less than or equal to 0.015 percent of S.
Electric furnace charge: the total loading (molten iron and scrap steel) is 110-120t, and different scrap steel is selected according to different scrap steel ratios. If the scrap ratio is 100%, the first desulfurization is not participated.
The electric furnace terminal adopts a high-carbon tapping process, and the terminal C is required: more than or equal to 0.45 percent, the end point P is less than or equal to 0.010 percent, and the end point temperature is 1620+/-40 ℃.
When the tapping amount of the electric furnace is about 15t, the alloy starts to be added.
Feeding sequence: 1/3 low nitrogen carburant-low titanium low aluminum ferrosilicon-low carbon ferromanganese-2/3 low nitrogen carburant-lime-synthetic slag special for cord steel, wherein the lime addition amount is controlled at 0.8kg/t, the synthetic slag addition amount is controlled at 10kg/t, and the alkalinity is controlled at 0.8-1.1. The primary steelmaking water is deoxidized by adding a small amount of carburant in the tapping process of the electric furnace, and CO gas is used as deoxidized product of carbon, so that impurities can not be formed in molten steel, and the yield of low-titanium low-aluminum ferrosilicon and low-carbon ferromanganese can be improved.
And (3) adopting eccentric bottom tapping, reserving 8t of steel, starting the ladle bottom argon blowing when the electric furnace starts tapping, controlling the pressure at the early stage of tapping to be 0.3-0.7 MPa, controlling the flow reference value to be 200-1000NL/min, and adjusting the bottom argon blowing flow to be 0.3-0.6 MPa after tapping 3/4, wherein the flow reference value is 200-800N L/min.
3. LF refining treatment
As shown in fig. 1: argon control:
LF (ladle furnace) station entering, namely, after molten steel is in place, switching on and starting bottom blowing argon, and then electrifying and heating, wherein the argon flow is 350-450N L/min, taking a first molten steel sample after 5-8min, continuously switching on and blowing the bottom, controlling the argon flow to be 500-600N L/min, and electrifying and rapidly melting slag; and (3) adding alloy and carbon powder into the steel ladle according to the detection components of the B1 stage, rapidly reducing ladle bottom blowing before soft stirring after the molten steel components, slag melting and temperature reach standards, wherein the flow rate of the before soft stirring is 100-150NL/min for more than 8min, then switching into a soft stirring mode, and the flow rate is less than 100N L/min (when RH is exceeded, soft stirring is adjusted to RH tapping). Slag adjustment is not needed in the refining process, and RH vacuum treatment is carried out after the component temperature is in place.
4. RH vacuum treatment
RH adopts the treatment mode, the degassing time is more than or equal to 15 minutes under the vacuum degree less than or equal to 2mbar, the net circulation time is more than or equal to 8 minutes, and then the vacuum breaking and tapping are carried out.
After RH breaks the sky, firstly opening the argon flow of the large bottom blowing, consulting the flow 300-400N L/min to ensure that the bottom blowing of the bottom blowing ladle is smooth, then gradually adjusting the bottom blowing of the ladle to a soft stirring state within 2-3min, consulting the flow 40-100N L/min, and ensuring that the fluctuation condition of the slag surface is observed frequently in the early stage, the amplitude is controlled according to +/-8 mm, the molten steel is not exposed, and immediately adding a heat preservation agent after confirming that the soft stirring standard is met, requiring the heat preservation agent to be uniformly spread, observing the soft stirring effect midway, and ensuring that the state is always kept; the soft stirring time is more than or equal to 25 minutes;
5. continuous casting
Using 140 x 140mm continuous casting machine
And (3) molten steel protection: and full-protection casting is carried out by adopting a large ladle long nozzle, an argon seal, a submerged nozzle, a tundish covering agent and covering slag.
Tundish liquid level: the weight of molten steel is not less than 18 tons during ladle changing and normal casting.
Crystallizer liquid level: the liquid level is set to 75-85%, and the fluctuation of the liquid level of the crystallizer is controlled within +/-7%.
And (3) covering slag: the high-carbon steel (cord steel) covering slag is used, and the slag is added by adopting an automatic slag adding device. Adding slag according to the principles of frequent addition, little addition and even addition, strictly preventing the slag surface from reddening, and keeping the black slag state.
The continuous casting secondary cooling water distribution adopts a forced cooling process, the specific water quantity is 2.1L/kg, the superheat degree of the tundish is controlled at 28-38 ℃, and the pulling speed is 2.3m/min.
The measures can ensure that the inclusion control level of steel is ensured under the condition of high scrap ratio, and the wire drawing to below 0.4mm is ensured without breaking due to inclusion.
Example 1
The composition requirements for production SGLX A (steel scrap ratio is more than or equal to 50%) are as follows:
initial smelting furnace, electric furnace loading: the total loading (molten iron and scrap steel) is 118t, the scrap steel ratio is more than or equal to 50 percent, the scrap steel component Cr is less than or equal to 0.15 percent, ni is less than or equal to 0.1 percent, cu is less than or equal to 0.1 percent, mo is less than or equal to 0.02 percent, ti is less than or equal to 0.1 percent, sn is less than or equal to 0.015 percent, nb is less than or equal to 0.01 percent, V is less than or equal to 0.05 percent, al is less than or equal to 0.05 percent and S is less than or equal to 0.015 percent.
End point C of electric furnace: 0.52%, endpoint P:0.008% and end point temperature 1610 ℃.
When the tapping amount of the electric furnace is about 15t, firstly adding 100kg of carburant, and then adding 30kg of low-titanium low-aluminum ferrosilicon and 200kg of low-carbon ferromanganese alloy.
Lime is added in an amount of 80kg, synthetic slag is added in an amount of 1000kg, and the alkalinity is controlled at 0.88.
And adopting eccentric bottom tapping, and reserving the steel for 8t. When the electric furnace starts tapping, the ladle bottom argon blowing is started, the pressure at the early tapping stage is controlled to be 0.8MPa, the flow reference value is 248NL/min, the bottom argon blowing flow is adjusted to be 0.36MPa after tapping is performed by 3/4, and the flow reference value is 210NL/min.
LF refining, after LF molten steel is in place, firstly switching on and starting bottom blowing argon, then electrifying and heating, wherein the argon flow is 380NL/min, taking a first molten steel sample after 5-8min, continuously switching on and blowing the bottom, controlling the argon flow at 550NL/min, and electrifying and rapidly melting slag; and (3) supplementing 100kg of low-carbon ferromanganese, 20kg of low-titanium low-aluminum ferrosilicon and 6kg of carbon powder according to the component B1, rapidly reducing ladle bottom blowing after the molten steel component, slag melting and temperature reach standards, performing front soft stirring, wherein the front soft stirring flow is 130NL/min, and tapping after the time is more than 8min, performing RH vacuum treatment.
RH vacuum treatment: RH adopts the treatment mode, the degassing time is more than or equal to 15 minutes, the net circulation time is more than or equal to 8 minutes under the vacuum degree of 1.2mbar, and then the steel is broken and tapped.
After RH breaks the sky, firstly open the argon flow of the large bottom blowing, the flow 330NL/min, then the bottom blowing step by step small ladle bottom blowing argon is carried out to a soft stirring state within 2min, the flow 80NL/min, the fluctuation condition of the slag surface is observed for the former period, the fluctuation of the slag surface is slightly controlled according to +/-8 mm, the thermal insulation agent is added, and the soft stirring time is 25 minutes
Continuous casting: and full-protection casting is carried out by adopting a large ladle long nozzle, an argon seal, a submerged nozzle, a tundish covering agent and covering slag.
The components of the finished product are as follows:
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo | Al | Ti | As | Sn |
| 0.823 | 0.23 | 0.51 | 0.10 | 0.008 | 0.02 | 0.02 | 0.03 | 0.008 | 0.002 | 0.0011 | 0.003 | 0.003 |
crystallizer liquid level: the liquid level is set to 75-85%, and the fluctuation of the liquid level of the crystallizer is controlled within +/-5%.
The specific water quantity of the secondary cooling water distribution of continuous casting is 2.1L/kg, the superheat degree of the tundish is controlled at 35 ℃, and the pulling speed is 2.3m/min.
With the above measures, SGLX a successfully poured the 12 furnace.
Example two
The composition requirements for production SGLX A (steel scrap ratio is more than or equal to 70%) are as follows:
1. Primary smelting furnace
Electric furnace charge: the total loading (molten iron and scrap steel) is 117t, the scrap steel ratio is more than or equal to 70 percent,
The scrap steel comprises less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Ni, less than or equal to 0.07 percent of Cu, less than or equal to 0.015 percent of Mo, less than or equal to 0.1 percent of Ti, less than or equal to 0.015 percent of Sn, less than or equal to 0.01 percent of Nb, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Al and less than or equal to 0.01 percent of S. .
End point C of electric furnace: 0.55%, endpoint P:0.009%, end point temperature 1615 ℃.
When the tapping amount of the electric furnace is about 15t, 90kg of carburant is firstly added, and then 32kg of low-titanium low-aluminum ferrosilicon and 210kg of low-carbon ferromanganese alloy are added.
Lime is added in an amount of 80kg, synthetic slag is added in an amount of 1000kg, and the alkalinity is controlled at 0.89.
And adopting eccentric bottom tapping, and reserving the steel for 8t. When the electric furnace starts tapping, the ladle bottom argon blowing is started, the pressure at the early tapping stage is controlled to be 0.7MPa, the flow reference value is 229NL/min, the bottom argon blowing flow is adjusted to be 0.38MPa after tapping is performed by 3/4, and the flow reference value is 220NL/min.
3. LF refining
After LF molten steel is in place, firstly switching on and starting bottom blowing argon, then electrifying and heating, taking a first molten steel sample after the argon flow is 340NL/min and 5-8min, continuously switching on and blowing the bottom, controlling the argon flow to 520NL/min, and electrifying and rapidly melting slag; 110kg of low-carbon ferromanganese, 22kg of low-titanium low-aluminum ferrosilicon and 5kg of carbon powder are added according to the component B1, the ladle bottom blowing is rapidly reduced to carry out front soft stirring after the molten steel component, slag melting and temperature reach standards, the front soft stirring flow is 120NL/min, and RH vacuum treatment is carried out on tapping after the time is more than 8 min.
4. RH vacuum treatment
RH adopts the treatment mode, the degassing time is more than or equal to 15 minutes, the net circulation time is more than or equal to 8 minutes under the vacuum degree of 1.1mbar, and then the steel is broken and tapped.
After RH breaks the sky, firstly open the argon flow of the large bottom blowing, the flow 321NL/min, then the bottom blowing step by step small ladle bottom blowing argon is carried out to a soft stirring state within 2min, the flow 82NL/min, the fluctuation condition of the slag surface is observed for the former period, the fluctuation of the slag surface is slightly controlled according to +/-8 mm, the thermal insulation agent is added, and the soft stirring time is 25 minutes
5. Continuous casting
And full-protection casting is carried out by adopting a large ladle long nozzle, an argon seal, a submerged nozzle, a tundish covering agent and covering slag.
The components of the finished product are as follows:
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo | Al | Ti | As | Sn |
| 0.826 | 0.21 | 0.52 | 0.10 | 0.007 | 0.02 | 0.02 | 0.04 | 0.008 | 0.002 | 0.0010 | 0.003 | 0.003 |
crystallizer liquid level: the liquid level is set to 75-85%, and the fluctuation of the liquid level of the crystallizer is controlled within +/-5%.
The specific water quantity of the secondary cooling water distribution of continuous casting is 2.1L/kg, the superheat degree of the tundish is controlled at 35 ℃, and the pulling speed is 2.3m/min.
With the above measures, SGLX a successfully poured the 15 furnace.
Example III
The composition requirements for production SGLX A (steel scrap ratio is more than or equal to 100%) are as follows:
1. Primary smelting furnace
Electric furnace charge: the total loading (molten iron and scrap steel) is 118t, the whole scrap steel is smelted,
The scrap steel comprises less than or equal to 0.06 percent of Cr, less than or equal to 0.06 percent of Ni, less than or equal to 0.05 percent of Cu, less than or equal to 0.01 percent of Mo, less than or equal to 0.05 percent of Ti, less than or equal to 0.015 percent of Sn, less than or equal to 0.005 percent of Nb, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Al and less than or equal to 0.006 percent of S.
End point C of electric furnace: 0.48%, endpoint P:0.008%, end point temperature 1608 ℃.
When the tapping amount of the electric furnace is about 15t, 120kg of carburant is firstly added, and then 36kg of low-titanium low-aluminum ferrosilicon and 220kg of low-carbon ferromanganese alloy are added.
Lime is added in an amount of 80kg, synthetic slag is added in an amount of 1000kg, and the alkalinity is controlled at 0.91.
And adopting eccentric bottom tapping, and reserving the steel for 8t. When the electric furnace starts tapping, the ladle bottom argon blowing is started, the pressure at the early tapping stage is controlled to be 0.7MPa, the flow reference value is 232NL/min, the bottom argon blowing flow is adjusted to be 0.35MPa after tapping is performed by 3/4, and the flow reference value is 227NL/min.
3. LF refining
After LF molten steel is in place, firstly switching on and starting bottom blowing argon, then electrifying and heating, taking a first molten steel sample after 5-8min at the argon flow rate of 365NL/min, continuously switching on and blowing the bottom, controlling the argon flow rate at 527NL/min, and electrifying and rapidly melting slag; 130kg of low-carbon ferromanganese, 27kg of low-titanium low-aluminum ferrosilicon and 7kg of carbon powder are added according to the component B1, the ladle bottom blowing is rapidly reduced to carry out front soft stirring after the molten steel component, slag melting and temperature reach standards, the front soft stirring flow is 112NL/min, and RH vacuum treatment is carried out on tapping after the time is more than 8 min.
4. RH vacuum treatment
RH adopts the treatment mode, the degassing time is more than or equal to 15 minutes, the net circulation time is more than or equal to 8 minutes under the vacuum degree of 1.3mbar, and then the steel is broken and tapped.
After RH breaks the sky, firstly open the argon flow of the large bottom blowing, the flow 325NL/min, then the bottom blowing step by step small ladle bottom blowing argon is carried out to a soft stirring state within 2min, the flow 86NL/min, the fluctuation condition of the slag surface is observed for the former period, the fluctuation of the slag surface is slightly controlled according to +/-8 mm, the thermal insulation agent is added, and the soft stirring time is 25 minutes
5. Continuous casting
And full-protection casting is carried out by adopting a large ladle long nozzle, an argon seal, a submerged nozzle, a tundish covering agent and covering slag.
The composition of the finished product is shown in the following table:
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo | Al | Ti | As | Sn |
| 0.823 | 0.22 | 0.53 | 0.11 | 0.008 | 0.03 | 0.04 | 0.05 | 0.008 | 0.002 | 0.0010 | 0.003 | 0.003 |
crystallizer liquid level: the liquid level is set to 75-85%, and the fluctuation of the liquid level of the crystallizer is controlled within +/-5%.
The specific water quantity of the secondary cooling water distribution of continuous casting is 2.1L/kg, the superheat degree of the tundish is controlled at 35 ℃, and the pulling speed is 2.3m/min. With the above measures, SGLX a successfully poured 13 furnaces.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (8)
1. A low-carbon emission smelting method for superfine wiredrawing clean steel is characterized by comprising the following steps of: the method adopts scrap steel for smelting processing;
step one, carrying out deep desulfurization treatment on molten iron;
step two, mixing the waste steel and the molten iron in the step one according to a certain proportion to form waste molten steel, and smelting in an electric furnace;
thirdly, tapping by an electric furnace, and adding alloy when the tapping amount reaches 15 t;
Step four, transferring the scrap steel water added with the alloy in the step three into an LF refining furnace for refining, wherein the LF refining adopts staged feeding and stirring treatment;
and fifthly, carrying out RH vacuum treatment on the LF refined steel scraps in the fourth step, tapping, and carrying out subsequent continuous casting, polishing and rolling.
2. The low carbon emission smelting method for ultra-fine wire drawing clean steel according to claim 1, wherein: in the step one, the molten iron is subjected to deep desulfurization treatment, and the S content of the desulfurized molten iron is less than or equal to 0.005%; the temperature of the molten iron after desulfurization is not lower than 1250 ℃.
3. The low carbon emission smelting method for ultra-fine wire drawing clean steel according to claim 1, wherein: before molten iron is added into the scrap steel in the second step, the scrap steel is classified according to the scrap steel ratio of 100%, the scrap steel ratio of 70% and the scrap steel ratio of more than 50%, and the concrete classification is as follows:
Elemental residue control with scrap ratio of 100%: cr is less than or equal to 0.06 percent, ni is less than or equal to 0.06 percent, cu is less than or equal to 0.05 percent, mo is less than or equal to 0.01 percent, ti is less than or equal to 0.05 percent, sn is less than or equal to 0.015 percent, nb is less than or equal to 0.005 percent, V is less than or equal to 0.05 percent, al is less than or equal to 0.05 percent, and S is less than or equal to 0.006 percent;
Element residue control with scrap ratio of 70%: less than or equal to 0.1 percent of Cr, less than or equal to 0.1 percent of Ni, less than or equal to 0.07 percent of Cu, less than or equal to 0.015 percent of Mo, less than or equal to 0.1 percent of Ti, less than or equal to 0.015 percent of Sn, less than or equal to 0.01 percent of Nb, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Al, and less than or equal to 0.01 percent of S;
Element residue control with scrap ratio of more than 50 percent: less than or equal to 0.15 percent of Cr, less than or equal to 0.1 percent of Ni, less than or equal to 0.1 percent of Cu, less than or equal to 0.02 percent of Mo, less than or equal to 0.1 percent of Ti, less than or equal to 0.015 percent of Sn, less than or equal to 0.01 percent of Nb, less than or equal to 0.05 percent of V, less than or equal to 0.05 percent of Al, and less than or equal to 0.015 percent of S.
4. The low carbon emission smelting method for ultra-fine wire drawing clean steel according to claim 1, wherein: in the third step, when the tapping amount reaches 15t, the alloy is added in the following sequence: 1/3 low nitrogen carburant, low titanium low aluminum ferrosilicon, low carbon ferromanganese, 2/3 low nitrogen carburant, lime and special synthetic slag for cord steel.
5. The low carbon emission smelting method for ultra-fine wire drawing clean steel according to claim 4, wherein: the lime addition amount is controlled to be 0.8kg/t, the synthetic slag addition amount is controlled to be 10kg/t, and the alkalinity is controlled to be 0.8-1.1.
6. The low carbon emission smelting method for ultra-fine wire drawing clean steel according to claim 1, wherein: the LF refining is carried out in stages, and the steps of feeding and stirring are as follows:
(1) Firstly, switching on and starting bottom blowing argon after adding alloy thick scrap molten steel into place, and then electrifying and heating;
(2) Taking a first molten steel sample after argon is blown from the bottom for 5-8min, and continuing to open the bottom for blowing; the connection stage is B1;
(3) Supplementing alloy and carbon powder according to B1 stage sampling, and powering on to quickly remove slag; the connection stage is B2;
(4) Rapidly reducing ladle bottom blowing and performing pre-soft stirring after the molten steel components, slag melting and temperature reach standards;
(5) And switching to a soft stirring mode after the front soft stirring is finished, and tapping after the soft stirring is finished.
7. The low carbon emission smelting method for ultra-fine wire drawing clean steel according to claim 6, wherein: (1) Argon flow is 350-450NL/min during bottom blowing of argon;
(2) Controlling the flow rate of bottom blowing argon to be 500-600NL/min;
(4) The flow rate of soft stirring before the step is 100-150NL/min, and the time is more than 8min;
(5) In the step, the soft stirring mode time is more than or equal to 25min, and the flow is less than 100NL/min.
8. The low carbon emission smelting method for ultra-fine wire drawing clean steel according to claim 1, wherein: fifthly, the vacuum degree of RH vacuum treatment is less than or equal to 2mbar, the degassing time is more than or equal to 15 minutes, and the net circulation time is more than or equal to 8 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410157597.4A CN118007014A (en) | 2024-02-04 | 2024-02-04 | Low-carbon emission smelting method for superfine wiredrawing clean steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410157597.4A CN118007014A (en) | 2024-02-04 | 2024-02-04 | Low-carbon emission smelting method for superfine wiredrawing clean steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118007014A true CN118007014A (en) | 2024-05-10 |
Family
ID=90949530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410157597.4A Pending CN118007014A (en) | 2024-02-04 | 2024-02-04 | Low-carbon emission smelting method for superfine wiredrawing clean steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118007014A (en) |
-
2024
- 2024-02-04 CN CN202410157597.4A patent/CN118007014A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106148844B (en) | A kind of preparation method of sulfur-bearing ultralow titanium high standard bearing steel | |
| CN108330245B (en) | High-purity smelting method for stainless steel | |
| CN102071287B (en) | Method for melting high-temperature-resistance and high-pressure-resistance alloy steel | |
| KR101113717B1 (en) | Method and melting system for manufacturing a steel containing high contents of manganese and low contents of carbon | |
| CN110453032B (en) | Method for smelting ultralow manganese steel by using high-manganese molten iron | |
| CN108893576B (en) | Smelting method of welding rod steel H08A | |
| JP4736466B2 (en) | Method for producing high chromium molten steel | |
| CN110983161B (en) | Smelting method for realizing ultrahigh purity of bearing steel by controlling adding time of low-aluminum low-titanium ferrosilicon and combining with tundish electromagnetic stirring | |
| CN109252010B (en) | Smelting method for controlling oxidability of IF steel top slag | |
| CN114318154A (en) | High-cleanliness welding wire steel L-S3 and preparation method thereof | |
| CN108148946B (en) | LF furnace refining process | |
| CN111793772B (en) | High-standard bearing steel efficient production process | |
| CN112442572A (en) | Deoxidation control method for high-end bearing steel inclusion | |
| CN112342455A (en) | Smelting method of industrial pure iron | |
| CN114606357A (en) | Method for removing phosphorus and leaving carbon in medium-high carbon steel by converter | |
| CN112795720A (en) | Method for producing industrial pure iron by duplex converter method | |
| CN112322958A (en) | Low-carbon aluminum-containing steel and smelting control method thereof | |
| CN110527786B (en) | Method for directly alloying and steelmaking by using manganese ore in converter | |
| CN112877587A (en) | Method for smelting high-manganese TWIP steel by adopting electric arc furnace and ladle refining furnace | |
| CN116904832A (en) | Method for efficiently preparing ultra-pure steel pure iron | |
| CN115141904B (en) | Continuous casting blank for preparing low-carbon cold-rolled substrate and smelting process thereof | |
| CN115505685A (en) | Method for reducing oxidative damage of RH top slag of ultra-low carbon steel | |
| CN118007014A (en) | Low-carbon emission smelting method for superfine wiredrawing clean steel | |
| JPH10130714A (en) | Production of steel for wire rod excellent in wire drawability and cleanliness | |
| CN114836593A (en) | Smelting process of low-carbon aluminum-containing cold forging steel |
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 |