CN116657043A - Steel for low-alkalinity bead wire and production process thereof - Google Patents
Steel for low-alkalinity bead wire and production process thereof Download PDFInfo
- Publication number
- CN116657043A CN116657043A CN202310607526.5A CN202310607526A CN116657043A CN 116657043 A CN116657043 A CN 116657043A CN 202310607526 A CN202310607526 A CN 202310607526A CN 116657043 A CN116657043 A CN 116657043A
- Authority
- CN
- China
- Prior art keywords
- steel
- percent
- equal
- alkalinity
- bead wire
- 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 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 239000011324 bead Substances 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 229910001567 cementite Inorganic materials 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 8
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 238000009749 continuous casting Methods 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 4
- 229910052791 calcium Inorganic materials 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- 238000005275 alloying Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910001562 pearlite Inorganic materials 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 235000019738 Limestone Nutrition 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 239000006004 Quartz sand Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000010459 dolomite Substances 0.000 claims description 2
- 229910000514 dolomite Inorganic materials 0.000 claims description 2
- 239000010903 husk Substances 0.000 claims description 2
- 239000006028 limestone Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 238000009987 spinning Methods 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 7
- 239000011651 chromium Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 238000005204 segregation Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000037390 scarring Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000007920 subcutaneous administration Methods 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/003—Cementite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention provides steel for a low-alkalinity bead wire and a production process thereof, wherein the steel comprises the following chemical components in percentage by weight: 0.70 to 0.75 percent of C, 0.15 to 0.30 percent of Si, 0.30 to 0.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.018 percent of S, 0.30 to 0.35 percent of Cr, less than or equal to 0.0055 percent of O, less than or equal to 0.0070 percent of N, and the balance of iron and unavoidable impurities. The production mode of converter, LF refining furnace, continuous casting, rolling control and cooling control technology is matched with low-cost alloy design, so that the wire rod steel for the bead wire, which can meet high strength, ensure sorbite rate, reduce the generation of network cementite and has good drawing performance, is produced.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to steel for a low-alkalinity bead wire and a production process thereof.
Background
The wire rod for the bead wire produced by a certain steel mill is an ultra-clean steel representative product, is mainly used for producing the bead wire or the steel cord, and is a representative steel grade of high-grade hard wire steel. Because of the special use performance, the drawing deformation is extremely large, and besides the high requirements on the quantity, the type and the morphology of inclusions, the steel is required to have low S, P content and the like, and the wire rod rolling tolerance size is accurate.
The bead wire rod should be cut off cleanly from the head to the tail. The surface quality is required to be smooth, and the defects of folding, ear, scarring, layering, macroscopic cracks, slag inclusion and the like are avoided. Local indentations and bumps, scratches, pitting are allowed, the depth or height (from the actual dimensions) of which should not be more than 0.10mm.
In order to meet the requirement of the service performance of products, the existing wire rod steel for the bead wire has more alloy elements, and the production cost is higher due to complex preparation process, for example, a bead wire and a manufacturing method thereof are disclosed in a patent document with the application number of N202210585121.1; the patent document with the application number of CN202210635620.7 discloses a hot-rolled wire rod for 80-grade bead wires, a preparation method thereof and an automobile tire.
Therefore, the wire rod production process preparation method which can meet the requirements of high strength, sorbite rate assurance, reduction of the generation of network cementite and good drawing performance of the wire rod for the bead wire is to be provided. So that the process production cost can be reduced while the service performance of the product is satisfied.
Disclosure of Invention
The invention aims to provide low-alkalinity steel for a bead wire and a production process thereof, and adopts a production mode of a converter, an LF refining furnace, a continuous casting, a rolling control and cooling control process and a low-cost alloy design to produce the steel for the bead wire, which can meet high strength, ensure sorbite rate, reduce generation of network cementite and has good drawing performance.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the low-alkalinity steel for the bead wire comprises the following chemical components in percentage by weight: 0.70 to 0.75 percent of C, 0.15 to 0.30 percent of Si, 0.30 to 0.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.018 percent of S, 0.30 to 0.35 percent of Cr, less than or equal to 0.0055 percent of O, less than or equal to 0.0070 percent of N, and the balance of iron and unavoidable impurities.
The tensile strength of the wire rod for the low-alkalinity bead wire is 1038-1100 MPa, and the area shrinkage is 41-52%; the non-metallic inclusion A+C is less than or equal to 1.5, and B+D is less than or equal to 1.5.
The metallographic structure in the steel is sorbite, pearlite and trace cementite, the class B is rated by the network cementite, and the sorbite rate reaches more than 1.5 level.
The thickness of the decarburized layer of the low-alkalinity bead wire steel is 0.04-0.06mm.
The reason for designing the components of the invention is as follows:
c: carbon can improve the strength and hardness of steel, but as the carbon content increases, the plasticity and toughness of steel decrease. The content of C in the invention is controlled to be 0.70-0.75%.
Si: silicon can also improve the strength and hardness of steel, reduce the plasticity and toughness of steel, and has the deoxidization effect of silicon element in the steelmaking process. The Si content of the invention is controlled to be 0.15-0.30%.
Mn: manganese can improve the strength of steel, can combine with sulfur to form manganese sulfide to eliminate hot embrittlement of steel, and can improve the hardenability and wear resistance of steel. The Mn content of the invention is controlled to be 0.30-0.60%.
P, S phosphorus and sulfur are harmful elements in steel, and phosphorus is dissolved in ferrite, so that the strength and hardness of the steel can be improved, the biggest harm is serious segregation, the tempering brittleness is increased, the plasticity and toughness of the steel are obviously reduced, and the steel is easy to crack during cold working, namely the phenomenon of cold embrittlement; sulfur reduces the plasticity of steel, increases the brittleness of steel, and deteriorates the quality of steel. The P is less than or equal to 0.020 percent, and the S is less than or equal to 0.018 percent.
Cr is carbide forming element and is reasonably matched with carbon and manganese, so that the hardenability of the steel is improved, the matrix can be strengthened, the grains are refined, the strength, the hardness, the hardenability and the wear resistance of the steel are improved, and the corrosion resistance and the oxidation resistance of the steel are improved. The addition of a small amount of chromium can improve the solubility of vanadium in austenite and enhance the solid solution strengthening effect of vanadium. The Cr content of the invention is 0.30-0.35%.
In order to ensure the quality of casting blanks, the production process of the low-alkalinity steel for the bead wires improves the surface quality of the casting blanks by controlling effective measures such as the superheat degree of molten steel, the blank drawing speed, the electromagnetic stirring of a continuous casting crystallizer, the electromagnetic stirring of a solidification tail end and the like, and reduces internal cracks and central defects. The process comprises the steps of blast furnace molten iron, molten iron pretreatment, smelting by a combined blown converter, LF refining, 150mm multiplied by 150mm billet continuous casting (electromagnetic stirring of a crystallizer and electromagnetic stirring of a solidification end), heating by a stepping heating furnace, high-speed wire rolling, controlled cooling, sampling, inspection, judgment, packaging and warehouse exchange, and specifically comprises the following process steps:
1) Smelting in a converter: 10-15% of scrap steel and 85-90% of molten iron; oxygen top and bottom combined blowing is carried out, the tapping temperature is 1580-1600 ℃, the tapping end point C is 0.50-0.70%, double slag of a converter is smelted, and the target primary pouring P is less than or equal to 0.008%; slag is strictly forbidden. Ton steel auxiliary material addition amount: 27-35 kg of active lime, 4-5 kg of dolomite, 10-15 kg of Australian ore and 24-32 kg of limestone. And (3) ladle alloying: adding lime, a pre-deoxidizer and ferroalloy for deoxidizing alloying when tapping 1/4-1/3, and blowing argon for more than or equal to 5min; target amount of ton steel alloy addition: 2.6 to 3.5kg of silicomanganese, 1.2 to 1.8kg of low-calcium ferrosilicon and 5.1 to 5.5kg of high-carbon ferrochromium.
2) Argon is blown statically: the static argon blowing time is more than or equal to 8min, the temperature before treatment is 1505-1530 ℃, the temperature after treatment is 1480-1510 ℃, the feeding speed of pure calcium cored wire after static argon blowing is 1.0-1.2 kg/t, and the feeding line speed is 2.8-3.2 m/s.
3) Refining in an LF furnace: white slag operation is required, and under the condition of ensuring slag fluidity, the slag alkalinity R is controlled to be 0.85-1.10, and meanwhile, the oxygen potential in the slag is controlled; detecting molten steel in real time, and finely adjusting alloy to ensure that the components of the molten steel meet the standard requirements; LF refining time is 60-80 min, and full analysis temperature is 1475-1550 ℃; ton steel auxiliary material addition amount: 2.67-3.0 kg of active lime, 3.0-3.2 kg of quartz sand, 0.4-0.67 kg of carbide slag and 0.50-1.0 kg of carbonized rice husk; 0.8-1.2 kg of medium-carbon ferromanganese, 1.0-1.2 kg of high-carbon ferrochromium and 0.85-1.35 kg of low-calcium ferrosilicon, and detecting molten steel in real time, and performing fine adjustment on alloy to ensure that the molten steel components reach standard requirements, wherein the soft blowing time is more than or equal to 12min.
4) Continuous casting: the electromagnetic stirring current of the crystallizer is 280-320A, the frequency is 4-6 Hz, and the crystallizer is positively and negatively rotated; the electromagnetic stirring current at the tail end is 280-320A, the frequency is 6-10 Hz, and the continuous rotation is realized. The platform temperature is 1537-1547 ℃, the tundish temperature is 1495-1515 ℃, the superheat degree is kept at 25-35 ℃, and the pulling speed is 2.0-2.3 m/min. The whole process protection casting is carried out, and square billet high-carbon steel casting powder is used as mold powder of a crystallizer; the casting blank cutting adopts a mode of combining automatic and manual work.
5) The heating process comprises the following steps: heating by a step heating furnace, wherein the preheating section is 860-900 ℃, the heating section is 1080-1120 ℃, the soaking section is 1120-1160 ℃, and the heating time is less than or equal to 2.5 hours;
6) The rolling process comprises the following steps: rough rolling temperature is 1000-1040 ℃; the finish rolling inlet temperature is 880-920 ℃; the spinning temperature is 860-900 ℃; air cooling roller way speed: 0.70-0.80 m/s of head roller way; the heat preservation cover is opened completely; and (3) a fan: 1 # -8 # Fully open, 1 # -5 # The blower controls the air quantity and 6 by frequency modulation of 20-30 Hz # -11 # The air quantity of the fan is controlled by 45-50% through an air door, and the fan is completely closed by 9# -11#.
Compared with the prior art, the invention has the beneficial effects that:
the invention can effectively improve the quality of the wire rod for the bead wire, and ensures the tensile strength value and the sorbite rate of the wire rod and reduces segregation and network cementite through component design and a rolling and cooling control process. The continuous casting adopts crystallizer electromagnetic stirring and terminal electromagnetic stirring, so that the surface quality of a casting blank is improved, and center segregation and center defects are reduced; the steel wire rod toughness is ensured by combining a steel rolling stelmor controlled rolling and cooling process with a strong cooling process to obtain a metallographic structure consisting of sorbite, pearlite and a small amount of cementite.
The tensile strength of the steel wire rod is 1038-1100 MPa, the area reduction rate is 41-52%, and the nonmetallic inclusion A+C is less than or equal to 1.5; B+D is less than or equal to 1.5.
In addition, in the invention, the slag alkalinity R of LF furnace refining is controlled to be 0.85-1.10, and the slag component of refined top slag is actually controlled to lead MnO-Al 2 O 3 -SiO 2 Inclusion-like components are controlled within the plastic region.
Drawings
FIG. 1 is a metallographic structure diagram of the product of example 1.
FIG. 2 is a chart showing the thickness of the decarburized layer of the product of example 1.
Detailed Description
The following is a further description of embodiments of the invention, in conjunction with examples.
The chemical compositions of the examples of the invention are shown in Table 1; the manufacturing process parameters of the embodiment of the invention are shown in Table 2; the addition amount of the smelting auxiliary materials in the embodiment of the invention is shown in Table 3; the low-power defect of the casting blank of the embodiment of the invention is shown in table 4: the mechanical properties of the product of the embodiment of the invention are shown in Table 5; the microstructure and nonmetallic inclusion of the inventive examples are shown in Table 6.
Table 1 example chemical composition
| Examples | C | Si | Mn | P | S | Cr | O | N |
| 1 | 0.71 | 0.29 | 0.33 | 0.012 | 0.009 | 0.323 | 0.0038 | 0.0019 |
| 2 | 0.71 | 0.21 | 0.32 | 0.016 | 0.009 | 0.316 | 0.0033 | 0.0028 |
| 3 | 0.74 | 0.2 | 0.31 | 0.013 | 0.013 | 0.308 | 0.0031 | 0.0025 |
| 4 | 0.72 | 0.19 | 0.40 | 0.015 | 0.012 | 0.316 | 0.003 | 0.0029 |
| 5 | 0.71 | 0.23 | 0.45 | 0.015 | 0.009 | 0.32 | 0.0023 | 0.0031 |
| 6 | 0.73 | 0.25 | 0.41 | 0.012 | 0.008 | 0.327 | 0.0026 | 0.0031 |
| 7 | 0.74 | 0.19 | 0.34 | 0.013 | 0.012 | 0.315 | 0.0027 | 0.0028 |
| 8 | 0.71 | 0.18 | 0.50 | 0.011 | 0.009 | 0.32 | 0.0019 | 0.0024 |
| 9 | 0.74 | 0.17 | 0.56 | 0.008 | 0.012 | 0.308 | 0.0026 | 0.0026 |
| 10 | 0.73 | 0.28 | 0.48 | 0.01 | 0.011 | 0.326 | 0.0032 | 0.0028 |
Table 2 example manufacturing process parameters (one)
Table 2 example manufacturing process parameters (two)
Table 3 example smelting auxiliary material addition amount
Table 4 results of the low-power defect inspection of the cast slab of the example
| Examples | Center porosity | Center segregation | Shrinkage cavity | Corner crack | Edge crack | Intermediate crack | Center crack | Subcutaneous air bubbles | Nonmetallic inclusion |
| 1 | 1.0 | 0.5 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| 2 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 1.0 | 0.5 | 0.5 |
| 3 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 1.0 | 0.5 | 0.5 |
| 4 | 1.0 | 0.5 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| 5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 1.0 | 0.5 | 0.5 |
| 6 | 0.5 | 0.5 | 1.0 | 0.5 | 0.5 | 0.5 | 1.0 | 0.5 | 0.5 |
| 7 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 1.0 | 0.5 | 0.5 |
| 8 | 1.0 | 0.5 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| 9 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 1.0 | 0.5 | 0.5 |
| 10 | 0.5 | 0.5 | 1.0 | 0.5 | 0.5 | 0.5 | 1.0 | 0.5 | 0.5 |
Table 5 mechanical properties of the products of the examples
| Examples | Tensile strength/MPa | Area reduction/% |
| 1 | 1079 | 42 |
| 2 | 1067 | 45 |
| 3 | 1081 | 44 |
| 4 | 1046 | 42 |
| 5 | 1096 | 42 |
| 6 | 1085 | 42 |
| 7 | 1093 | 44 |
| 8 | 1076 | 42 |
| 9 | 1055 | 47 |
| 10 | 1039 | 45 |
TABLE 6 microstructure and nonmetallic inclusion of example products
Claims (9)
1. The steel for the low-alkalinity bead wire is characterized by comprising the following chemical components in percentage by weight: 0.70 to 0.75 percent of C, 0.15 to 0.30 percent of Si, 0.30 to 0.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.018 percent of S, 0.30 to 0.35 percent of Cr, less than or equal to 0.0055 percent of O, less than or equal to 0.0070 percent of N, and the balance of iron and unavoidable impurities.
2. The steel for low-alkalinity bead wire according to claim 1, wherein the tensile strength of the wire rod for low-alkalinity bead wire is 1038 to 1100MPa and the reduction of area is 41% to 52%; the non-metallic inclusion A+C is less than or equal to 1.5, and B+D is less than or equal to 1.5.
3. The steel for low-alkalinity bead wires according to claim 1, wherein the metallographic structure in the steel is sorbite + pearlite + microcystone, the net cementite is rated as class B, and the sorbite rate is above 1.5.
4. The steel for low alkalinity bead wire according to claim 1, wherein the thickness of the decarburized layer of the steel for low alkalinity bead wire is 0.04 to 0.06mm.
5. A process for producing a steel for low alkalinity bead wire as claimed in any one of claims 1 to 4, comprising the process steps of:
1) Smelting in a converter: oxygen top and bottom combined blowing is carried out, the tapping temperature is 1580-1600 ℃, the tapping end point C is 0.50-0.70%, double slag of a converter is smelted, and the target primary pouring P is less than or equal to 0.008%;
2) Argon is blown statically: the static argon blowing time is more than or equal to 8min, the temperature before treatment is 1505-1530 ℃, and the temperature after treatment is 1480-1510 ℃;
3) Refining in an LF furnace: white slag operation is required, the slag alkalinity R is controlled to be 0.85-1.10, the LF refining time is 60-80 min, and the total analysis temperature is 1475-1550 ℃;
4) Continuous casting: the temperature of the platform is 1537-1547 ℃, the temperature of the tundish is 1495-1515 ℃, the superheat degree is kept at 25-35 ℃, and the pulling speed is 2.0-2.3 m/min;
5) The heating process comprises the following steps: heating by a step heating furnace, wherein the preheating section is 860-900 ℃, the heating section is 1080-1120 ℃, the soaking section is 1120-1160 ℃, and the heating time is less than or equal to 2.5 hours;
6) The rolling process comprises the following steps: rough rolling temperature is 1000-1040 ℃; the finish rolling inlet temperature is 880-920 ℃; the spinning temperature is 860-900 ℃; air cooling roller way speed: 0.70-0.80 m/s of head roller way; the heat preservation cover is opened completely; and (3) a fan: 1 # -8 # Fully open, 1 # -5 # The blower controls the air quantity and 6 by frequency modulation of 20-30 Hz # -11 # The fan passes through an air door 45%About 50% of the air quantity is controlled, and 9# -11# is totally closed.
6. The process for producing low alkalinity bead wire steel according to claim 5, wherein the converter smelting ton steel auxiliary material of step 1) is added in the following amounts: 27-35 kg of active lime, 4-5 kg of dolomite, 10-15 kg of Australian ore, 24-32 kg of limestone and 1/4-1/3 of tapping for deoxidization alloying, wherein the argon blowing time is more than or equal to 5min.
7. The process for producing a steel for a low alkalinity bead wire according to claim 5, wherein the step 2) is carried out by feeding 1.0-1.2 kg/t of pure calcium cored wire after static argon blowing, and the feeding speed is 2.8-3.2 m/s.
8. The process for producing low alkalinity bead wire steel according to claim 5, wherein the LF furnace smelting ton steel auxiliary material addition amount of step 3) is as follows: 2.67-3.0 kg of active lime, 3.0-3.2 kg of quartz sand, 0.4-0.67 kg of carbide slag and 0.50-1.0 kg of carbonized rice husk; the soft blowing time is more than or equal to 12min.
9. The process for producing a steel for a low alkalinity bead wire according to claim 5, wherein in the step 4), the crystallizer electromagnetic stirring current is 280-320A, the frequency is 4-6 Hz, and the rotation is positive and negative; the electromagnetic stirring current at the tail end is 280-320A, the frequency is 6-10 Hz, and the continuous rotation is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310607526.5A CN116657043A (en) | 2023-05-26 | 2023-05-26 | Steel for low-alkalinity bead wire and production process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310607526.5A CN116657043A (en) | 2023-05-26 | 2023-05-26 | Steel for low-alkalinity bead wire and production process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116657043A true CN116657043A (en) | 2023-08-29 |
Family
ID=87723593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310607526.5A Pending CN116657043A (en) | 2023-05-26 | 2023-05-26 | Steel for low-alkalinity bead wire and production process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116657043A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116875873A (en) * | 2023-09-08 | 2023-10-13 | 江苏省沙钢钢铁研究院有限公司 | Method for recycling cord thread/tire bead waste steel wire and preparing wire rod by using same |
-
2023
- 2023-05-26 CN CN202310607526.5A patent/CN116657043A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116875873A (en) * | 2023-09-08 | 2023-10-13 | 江苏省沙钢钢铁研究院有限公司 | Method for recycling cord thread/tire bead waste steel wire and preparing wire rod by using same |
| CN116875873B (en) * | 2023-09-08 | 2023-12-22 | 江苏省沙钢钢铁研究院有限公司 | Method for recycling cord thread/tire bead waste steel wire and preparing wire rod by using same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107287504B (en) | The middle carbon easy-cutting non-hardened and tempered steel and its manufacturing technique method of sulfur-bearing, tellurium | |
| CN109252097B (en) | Non-quenched and tempered steel of high-strength expansion-fracture connecting rod and continuous casting production process thereof | |
| CN110343954B (en) | Steel for automobile engine connecting rod and manufacturing method thereof | |
| CN109266966B (en) | Non-quenched and tempered round steel for direct cutting and production method thereof | |
| CN111961988B (en) | Production process and forging method of medium-carbon non-quenched and tempered steel for automobile expansion fracture connecting rod | |
| EP3050994A1 (en) | Non-quenched and tempered steel and manufacturing method therefor | |
| CN112342452B (en) | Manufacturing method of high-strength wire rod for tire bead steel wire | |
| CN114672723B (en) | 46MnVS series steel for expansion connecting rod and manufacturing method thereof | |
| CN114941101B (en) | Steel for bearing shaft of automobile engine and production method thereof | |
| CN115125448A (en) | Non-quenched and tempered steel for cold machining of hydraulic piston rod and preparation method | |
| CN116657043A (en) | Steel for low-alkalinity bead wire and production process thereof | |
| CN109487155B (en) | Non-quenched and tempered steel for hydraulic rod of high-pressure oil cylinder and production method thereof | |
| CN109930063B (en) | Steel for engineering machinery crawler chassis wheel body and production method thereof | |
| CN112143970A (en) | High-strength high-toughness non-quenched and tempered front axle steel and production method thereof | |
| CN114032454B (en) | Steel for PC prestressed steel wire and production process thereof | |
| CN113151744B (en) | Steel S48C for engineering machinery slewing bearing and production method thereof | |
| CN111057964B (en) | Steel for high-strength knuckle of new energy automobile and preparation method and application thereof | |
| CN113667900A (en) | High-hardenability carburizing steel, and manufacturing method and application thereof | |
| CN113604739A (en) | Steel for car driving shaft ball cage for precision forming and manufacturing method thereof | |
| CN116657041A (en) | Wire rod steel C82D2 for prestressed steel wire and steel strand and production process | |
| CN116949353B (en) | Bi-containing free-cutting non-quenched and tempered steel for automobile engine crankshaft and manufacturing method thereof | |
| CN113943895B (en) | High-quality steel for spring steel wire and production process thereof | |
| CN112126743B (en) | Production method of low-aluminum-content Cr5 steel ingot for supporting roll | |
| CN115418560B (en) | Steel for high-speed motor train traction motor bearing and production method thereof | |
| CN116640991A (en) | Steel SWRH42A for nail making and production process thereof |
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 |