CN116891977B - Wire rod for extra-high-strength diamond wire bus and production method thereof - Google Patents
Wire rod for extra-high-strength diamond wire bus and production method thereof Download PDFInfo
- Publication number
- CN116891977B CN116891977B CN202311125991.1A CN202311125991A CN116891977B CN 116891977 B CN116891977 B CN 116891977B CN 202311125991 A CN202311125991 A CN 202311125991A CN 116891977 B CN116891977 B CN 116891977B
- Authority
- CN
- China
- Prior art keywords
- wire rod
- percent
- equal
- less
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910003460 diamond Inorganic materials 0.000 title claims abstract description 61
- 239000010432 diamond Substances 0.000 title claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 89
- 239000010959 steel Substances 0.000 claims abstract description 89
- 238000000034 method Methods 0.000 claims abstract description 82
- 230000008569 process Effects 0.000 claims abstract description 71
- 238000005096 rolling process Methods 0.000 claims abstract description 51
- 238000009749 continuous casting Methods 0.000 claims abstract description 43
- 238000007670 refining Methods 0.000 claims abstract description 36
- 238000003723 Smelting Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000000227 grinding Methods 0.000 claims abstract description 23
- 239000000126 substance Substances 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 50
- 238000001816 cooling Methods 0.000 claims description 42
- 239000002893 slag Substances 0.000 claims description 41
- 238000005204 segregation Methods 0.000 claims description 33
- 238000010079 rubber tapping Methods 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 229910052760 oxygen Inorganic materials 0.000 claims description 23
- 229910052698 phosphorus Inorganic materials 0.000 claims description 23
- 239000012535 impurity Substances 0.000 claims description 22
- 229910052717 sulfur Inorganic materials 0.000 claims description 20
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 18
- 229910001567 cementite Inorganic materials 0.000 claims description 18
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 18
- 238000005498 polishing Methods 0.000 claims description 18
- 238000002791 soaking Methods 0.000 claims description 18
- 238000009987 spinning Methods 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 239000010936 titanium Substances 0.000 claims description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 238000004513 sizing Methods 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 229910052719 titanium Inorganic materials 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 238000009792 diffusion process Methods 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 9
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 9
- 239000003546 flue gas Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 8
- 230000003064 anti-oxidating effect Effects 0.000 claims description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical group [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 238000005422 blasting Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 230000003749 cleanliness Effects 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 230000010485 coping Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000006872 improvement Effects 0.000 abstract description 4
- 238000000265 homogenisation Methods 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000005261 decarburization Methods 0.000 description 16
- 229910052757 nitrogen Inorganic materials 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000006477 desulfuration reaction Methods 0.000 description 7
- 230000023556 desulfurization Effects 0.000 description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 6
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 6
- 235000011941 Tilia x europaea Nutrition 0.000 description 6
- 229910000514 dolomite Inorganic materials 0.000 description 6
- 239000010459 dolomite Substances 0.000 description 6
- 239000004571 lime Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000005491 wire drawing Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 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 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000004381 surface treatment 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C21D2211/003—Cementite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a wire rod for an extra-high strength diamond wire bus and a production method thereof, and belongs to the technical field of steel preparation. The production method comprises the following steps: molten steel smelting, LF refining, continuous casting, grinding, heating and steel rolling. The production method of the wire rod for the ultra-high strength diamond wire bus adopts a small square billet one-fire process, and can realize the tissue homogenization, steel purification and surface quality improvement of the wire rod, improve the drawing performance of the wire rod and reduce the wire breakage rate in the production process of the diamond wire bus by reasonably designing the chemical components of the wire rod and combining with controlling the conditions of the whole process.
Description
Technical Field
The invention relates to the technical field of steel preparation, in particular to a wire rod for an ultra-high strength diamond wire bus and a production method thereof.
Background
The diamond wire busbar is used as a base line of the diamond wire and is used for cutting hard and brittle materials such as solar silicon chips, semiconductors, sapphires and the like after diamond is electroplated on the surface of the busbar. In the process of producing the diamond wire bus by using the wire rod with the diameter of 5.5mm, the machining procedures of surface treatment, drawing, heat treatment, electroplating and the like are carried out for a plurality of times, wherein the number of drawing passes is up to more than 50, and the total drawing compression rate is up to more than 99.993%.
Because the bus wire diameter is superfine and the compression rate in the processing process is extremely high, factors such as surface quality, decarburized layer, center segregation, inclusion and the like of the wire rod have great influence on the drawing process, and the existing ultrahigh-strength wire rod cannot meet the quality requirement of the diamond wire bus.
Under the prior art condition, the refining process has poor inclusion removal effect and insufficient inclusion plasticity, the central segregation control fluctuation of the billets causes larger fluctuation of wire rod network cementite, the billet decarburization inheritance in the heating process causes thicker wire rod decarburization layer, and the factors cause higher wire breakage rate of the wire rods produced by the billets in the bus wire drawing process.
Disclosure of Invention
The invention aims to provide a wire rod for an ultra-high strength diamond wire bus and a production method thereof, wherein a reasonable component system is designed, a reasonable process route and a reasonable production method are adopted to improve the surface quality of the wire rod in the small square billet process flow, reduce the depth of a decarburized layer of the wire rod, reduce the center segregation and grain boundary cementite fluctuation of the wire rod, reduce the size and quantity of inclusions, improve the drawing performance of the wire rod, reduce the wire breakage rate of the ultra-high strength wire rod in the process of producing the diamond wire bus, and effectively solve the problem that the wire breakage rate of the wire rod produced by the small square billet in the process of wire rod drawing.
The invention is realized by the following technical scheme:
the invention provides a production method of a wire rod for an extra-high strength diamond wire bus, which comprises the following chemical components in percentage by mass: c:0.90 to 0.95 percent, si:0.17 to 0.25 percent, mn:0.20 to 0.40 percent, cr:0.20 to 0.35 percent, S is less than or equal to 0.010 percent, P is less than or equal to 0.015 percent, al is less than or equal to 0.002 percent, ti is less than or equal to 0.001 percent, O is less than or equal to 0.0008 percent, N is less than or equal to 0.0020 percent, and the balance is Fe and unavoidable impurity elements;
the production method comprises the following steps:
smelting molten steel: smelting by adopting molten iron, controlling the tapping oxygen content to be less than or equal to 0.050 percent, controlling the terminal phosphorus to be less than or equal to 0.012 percent, and controlling the sulfur to be less than or equal to 0.012 percent;
LF refining: adopting high-alkalinity slag, wherein the alkalinity of primary slag formation is 2.1-2.4; adopting low-alkalinity slag, wherein the alkalinity of secondary slag forming is 0.8-1.0; when soft blowing is carried out, the argon flow is 45-48L/min, and the soft blowing time is more than or equal to 60min;
continuous casting; adopting square billet sections with the sizes of 160mm multiplied by 160mm to produce, adopting an integral nozzle to pour, controlling the continuous casting drawing speed to be 1.8m/min, and controlling the superheat degree to be 15-25 ℃; adopting crystallizer electromagnetic stirring and terminal electromagnetic stirring, wherein the current of the terminal electromagnetic stirring is 450-600A, and the frequency is 6-12Hz;
heating; adopting a high-temperature diffusion process, wherein the total heating time is more than or equal to 6 hours; wherein the soaking temperature is 1150-1200 ℃, the soaking period time is 2.5-2.6h, the furnace pressure is not lower than 20Pa, and the residual oxygen content of the flue gas is 0.5-3%;
rolling steel; the square billet subjected to high-temperature diffusion is subjected to the procedures of high-pressure water descaling, rough rolling, middle rolling, pre-finish rolling, finish rolling and reducing sizing in sequence to obtain a wire rod;
and (3) cooling control: and (5) feeding the rolled wire rod into a Steyr air cooling line for cooling after spinning.
Further, in the molten steel smelting process, the chemical components of the molten iron include, in mass percent: c: 3.9-4.3%, si: 0.22-0.25%, P: 0.10-0.13%, S: 0.021-0.025%, ti: 0.018-0.025%, and the balance being Fe and unavoidable impurities;
in the molten steel smelting process, self-produced scrap steel is adopted to ensure the cleanliness of steel and iron materials fed into the furnace;
in the molten steel smelting process, the converter adopts two slag forming processes, so that the phosphorus content is reduced by less than or equal to 0.10%;
in the molten steel smelting process, the converter is deoxidized by adopting silicon after the converter.
Further, in the LF refining process, micro aluminum micro titanium ferrosilicon powder is adopted for component adjustment.
Further, in the continuous casting process, two-cooling full-water forced cooling is adopted, and the specific water quantity of the two-cooling is controlled to be 1.6-1.8L/kg;
in the continuous casting process, the carbon segregation index of the continuous casting billet is 1.00-1.10.
Further, in the steel rolling process, the descaling pressure of high-pressure water is more than or equal to 20Mpa; the initial rolling temperature of rough rolling is 1100-1150 ℃; the finish rolling temperature is 890-930 ℃, the reducing sizing temperature is 910-950 ℃, and the dimensional accuracy of the wire rod is controlled to reach the C-level accuracy.
Further, in the cooling control process, the spinning temperature is controlled to 870-900 ℃, and the maximum air quantity of the fan is 200000m 3 And/h, the roller way speed is 0.90-1.20m/s;
in the cooling control process, a heat preservation cover is covered when the temperature of the wire rod is reduced to below 550 ℃.
Further, the production method further comprises a casting blank grinding process, wherein the casting blank grinding process is performed before the heating process;
the casting blank coping process comprises the following steps: and (3) carrying out surface full polishing on the surface of the steel billet, polishing the steel billet to a depth of 2-3mm, carrying out shot blasting after polishing to remove burrs generated during polishing, and then carrying out flaw detection and spot polishing of local defects.
Further, before the heating process, the surface of the billet is coated with an anti-oxidation coating before entering the furnace.
The invention also provides a wire rod for the extra-high strength diamond wire bus, which is prepared by adopting the production method of the wire rod for the extra-high strength diamond wire bus.
Further, the center segregation 0-level proportion of the wire rod for the ultra-high strength diamond wire bus reaches 100%;
the ratio of the 1 grade and the following grain boundary cementite reaches 100 percent;
the total decarburized layer depth is less than 30 mu m;
the inclusion maximum width is less than or equal to 5 mu m, the inclusion ratio of the width of 3 mu m or below reaches more than 99.7 percent, and the brittle inclusion area ratio is less than or equal to 3.5X10 -6 ；
The ultra-high strength diamond wire bus can stably reach more than 850km for continuous wire when being used for producing the diamond wire bus with the diameter of 43-45 mu m.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the production method of the wire rod for the ultra-high strength diamond wire bus adopts a small square billet one-fire process, and can realize the tissue homogenization, steel purification and surface quality improvement of the wire rod, improve the drawing performance of the wire rod and reduce the wire breakage rate in the production process of the diamond wire bus by reasonably designing the chemical components of the wire rod and combining with controlling the conditions of the whole process.
According to the production method of the wire rod for the extra-high strength diamond wire bus, inclusions are floated and discharged and plasticized by controlling the alkalinity and soft blowing time of refining slag in the refining process; the center segregation of continuous casting of the small square billets is reduced through control of the pulling speed, the superheat degree and the tail end electromagnetic stirring parameters; removing surface defects and decarburized layers through billet polishing; oxidation and decarburization in the heating process are reduced through the steel billet anti-oxidation coating and the control of the residual oxygen content of furnace gas of the heating furnace; homogenizing the components of the steel billet by heating at high temperature for a long time; the separation of the network cementite is avoided by rolling and cooling control; the whole process condition is optimized, the structure homogenization, steel purification and surface quality improvement of the wire rod under the small square billet process are realized, the wire rod drawing performance is improved, and the wire breakage rate in the diamond wire bus production process is reduced.
The wire rod for the ultra-high strength diamond wire bus has the center segregation 0 level proportion reaching 100%, the grain boundary cementite 1 level and below level proportion reaching 100%, the total decarburized layer depth being less than 30 mu m, the maximum inclusion width being less than or equal to 5 mu m, the inclusion width being 3 mu m and below accounting for more than 99.7%, the brittle inclusion area accounting for less than or equal to 3.5x10 -6 The method comprises the steps of carrying out a first treatment on the surface of the When the method is applied to producing diamond wire buses with the diameter of 43-45 mu m, the continuous wire can be stably reached to more than 850 km.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a photograph showing inclusions in a wire rod manufactured in example 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent, and the description thereof is merely illustrative of the present invention and not intended to be limiting. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The technical scheme of the invention is as follows:
the production method of the wire rod for the ultra-high strength diamond wire bus comprises the following chemical components in percentage by mass: c:0.90 to 0.95 percent, si:0.17 to 0.25 percent, mn:0.20 to 0.40 percent, cr:0.20 to 0.35 percent, S is less than or equal to 0.010 percent, P is less than or equal to 0.015 percent, al is less than or equal to 0.002 percent, ti is less than or equal to 0.001 percent, O is less than or equal to 0.0008 percent, N is less than or equal to 0.0020 percent, and the balance is Fe and unavoidable impurity elements;
the invention reasonably designs the chemical components of the wire rod:
c is a main strengthening element of the steel, and determines the metallographic structure, mechanical property and technological property of the steel. As the carbon content increases, the hardness, strength, and plasticity, toughness, and impact toughness of the steel increase, and the cold quenching tendency and aging tendency increase. If the C content is too low, the strength of the steel wire is insufficient, and if the C content is too high, the risk of wire rod drawing and wire breakage is increased. The C content in the wire rod is controlled to be 0.90-0.95%, so that the strength of the finished steel wire can be ensured, the carbon segregation tendency can be reduced, and the drawing performance can be improved.
Si is an important deoxidizing element and strengthening element. Si combines with oxygen in molten steel to form silicate inclusions, and the overall performance of the steel is destroyed; si is dissolved in ferrite to form solid solution, so that the strength and hardness of the steel are improved; si can obviously improve the elastic limit, yield strength and yield ratio of the steel wire; however, too high a content may deteriorate the plasticity and elongation properties of the steel wire. The Si content in the wire rod is controlled to be 0.17-0.25%, so that the full deoxidization of molten steel can be ensured, the plasticity can be improved, and the drawing wire breakage rate can be reduced.
Mn is a deoxidizing element, a strengthening element and a strong hardenability element, and meanwhile, the addition of Mn can reduce the harm of S element, but when the content is too high, the plasticity of steel is reduced, the hardenability is improved, and particularly, center segregation is easily caused to generate a quenching structure after rolling, so that drawing broken wires are caused. The Mn content in the wire rod is controlled to be 0.20-0.40%, so that the deoxidizing effect can be ensured, the strength of the steel wire can be ensured, and the drawing breakage rate can be reduced.
Cr can improve the strength and hardenability of the wire rod, refine the structure of the high-carbon steel wire rod, reduce the spacing between sorbite sheets and improve the drawing performance of the wire rod, but too high content of Cr can lead to too high strength and hardness of the wire rod, so that the wire rod is seriously work-hardened in the drawing process, the drawing performance is poor, and the content of Cr in the wire rod is controlled to be 0.20-0.35%, so that the wire rod has both high strength and excellent drawing performance.
A1 is a good deoxidizing element, but A1 is formed 2 O 3 The inclusion is needed to be avoided to the greatest extent in deep processing products such as wiredrawing and the like, so that the lower the Al content is, the better the Al content is, and the Al content in the wire rod is controlled to be less than or equal to 0.002 percent so as to reduce the quantity of brittle inclusions.
Ti is a residual element which is extremely harmful, and is extremely easy to form cubes or cuboid Ti (C, N) with edges and corners together with interstitial atoms such as C, N, so that the drawing performance and fatigue performance of the steel are affected, and the lower the content is, the better the content is, and the Ti content in the wire rod is controlled to be less than or equal to 0.001%.
S, P are harmful impurity elements which are easy to cause cold brittleness and hot brittleness, and the lower the content is, the better the content is, S is less than or equal to 0.010 percent and P is less than or equal to 0.015 percent in the wire rod, and adverse effects on various properties of the wire rod are avoided.
O, N: o is a harmful element in steel, almost all of the O exists in the form of oxide inclusions, and the higher the oxygen content is, the more the number of oxide inclusions is, and the more adverse is to deep drawing of the steel, so that O is controlled to be less than or equal to 0.0008%. N can obviously improve the strength of the steel, obviously reduce the plasticity, and improve the work hardening rate of the wire rod, so that the wire breakage rate is increased, and the N is controlled to be less than or equal to 0.0020 percent.
The production method of the wire rod for the extra-high strength diamond wire bus comprises the following steps:
step 1, smelting molten steel: in order to control harmful residual elements P, S and Ti in steel, special molten iron is selected, and the molten iron is pre-desulfurized, wherein the chemical components of the molten iron comprise the following components in percentage by mass: c: 3.9-4.3%, si: 0.22-0.25%, P: 0.10-0.13%, S: 0.021-0.025%, ti: 0.018-0.025%, and the balance of Fe and unavoidable impurities.
Meanwhile, the cleanliness of the steel and iron materials entering the furnace is guaranteed by adopting scrap steel. The phosphorus content is reduced by twice slagging of the converter to be less than or equal to 0.010%, the converter tapping adopts a sliding plate to stop slag, the slag discharging of the converter is stopped, and the inclusion of foreign impurities (large-particle impurities) is avoided from the source. The converter is deoxidized by silicon, deoxidizers such as A1, ti and the like are forbidden, the tapping oxygen content is less than or equal to 0.050%, the terminal phosphorus is less than or equal to 0.012%, and the sulfur is less than or equal to 0.012%.
Step 2, LF refining: adopting high-alkalinity slag, wherein the alkalinity of primary slag formation is 2.1-2.4; low-alkalinity slag is adopted, and the alkalinity of secondary slag formation is 0.8-1.0. In the refining process, slag is formed twice, high-alkalinity slag is adopted in the early stage of refining, so that deoxidation and desulfurization are facilitated, ladle erosion is reduced, slag with low alkalinity is formed for the second time, the plasticization of inclusions is realized, and adverse effects of the inclusions during drawing are reduced.
In order to ensure the denaturation and floating of the inclusions, the soft blowing time is strictly controlled to be more than or equal to 60min, the argon flow is 45-48L/min, and molten steel is not exposed during the soft blowing, so that nitrogen absorption and oxygen inhalation are prevented.
The refining process adopts micro aluminum micro titanium ferrosilicon powder to adjust the components, so that the risk of generating impurities containing Al and Ti is reduced.
Step 3, continuous casting; the production is carried out by adopting square billet sections with the dimensions of 160mm multiplied by 160mm, the integral nozzle is adopted for casting, the continuous casting drawing speed is controlled to be 1.8m/min, and the superheat degree is controlled to be 15-25 ℃.
Adopting crystallizer electromagnetic stirring and terminal electromagnetic stirring, wherein the current of the terminal electromagnetic stirring is 450-600A, and the frequency is 6-12Hz;
the secondary cooling total water intensity cooling is adopted, the secondary cooling specific water quantity is controlled to be 1.6-1.8L/kg, the component segregation of molten steel in the solidification process can be reduced, and the carbon segregation index of the obtained continuous casting billet is 1.00-1.10.
Step 4, grinding the casting blank: in order to reduce the influence of the surface defects of the wire rod on wire drawing, the surface of the steel billet is subjected to full polishing with the polishing depth of 2-3mm, burrs generated during polishing are removed by shot blasting after polishing, then flaw detection and local defect spot polishing are carried out, and various defects which possibly affect the surface quality of the rolled material are thoroughly removed.
Step 5, billet coating: an anti-oxidation coating is coated on the surface of the billet before the billet is put into the furnace, so as to avoid serious oxidation and decarburization caused by long-time heating of the billet in the heating furnace at high temperature.
Step 6, heating: the stability of the center segregation of the steel billet is a key to influence the stability of the wire rod drawing process.
In order to eliminate the influence of center segregation, a high-temperature diffusion process is adopted, so that the total time in the heating furnace is ensured to be not less than 6 hours; wherein the soaking temperature is 1150-1200 ℃, the soaking period is 2.5-2.6h, the furnace pressure is not lower than 20Pa, and the residual oxygen content of the flue gas is 0.5-3%.
Step 7, rolling steel; the square billet subjected to high-temperature diffusion is subjected to the procedures of high-pressure water descaling, rough rolling, middle rolling, pre-finish rolling, finish rolling and reducing sizing in sequence to obtain a wire rod;
in order to avoid the pressing-in of the billet oxide skin, the high-pressure water descaling pressure is more than or equal to 20MPa, the initial rolling temperature of rough rolling is 1100-1150 ℃, the finish rolling temperature is 890-930 ℃, the reducing sizing temperature is 910-950 ℃, and the size precision of the wire rod is controlled to reach the C-level precision.
The billet subjected to high-temperature diffusion is subjected to the working procedures of high-pressure water descaling, 6 rough rolling, 8 middle rolling, 6 pre-finish rolling, 8 finish rolling and 4 reducing sizing in sequence to obtain the wire rod with the diameter of 5.5 mm.
Step 8, cooling control: the rolled wire rod enters a Steyr air cooling line for cooling after spinning, the spinning temperature is controlled to be 870-900 ℃, and the maximum air quantity of a fan is 200000m 3 And/h, the roller way speed is 0.90-1.20m/s;
in the cooling control process, a heat preservation cover is covered when the temperature of the wire rod is reduced to below 550 ℃.
The wire rod for the extra-high-strength diamond wire bus has a center segregation 0-level proportion reaching 100%;
the ratio of the 1 grade and the following grain boundary cementite reaches 100 percent;
the total decarburized layer depth is less than 30 mu m;
the inclusion maximum width is less than or equal to 5 mu m, the inclusion ratio of the width of 3 mu m or below reaches more than 99.7 percent, and the brittle inclusion area ratio is less than or equal to 3.5X10 -6 ；
The ultra-high strength diamond wire bus can stably reach more than 850km for continuous wire when being used for producing the diamond wire bus with the diameter of 43-45 mu m.
For further explanation of the present invention, the extra-high strength wire rods for diamond wire bus bars provided by the present invention are described below with reference to examples, but it should be understood that these examples are implemented on the premise of the technical solution of the present invention, and detailed implementation and specific operation processes are given only for further explanation of the features and advantages of the present invention, and not for limitation of the claims of the present invention, and the scope of protection of the present invention is not limited to the examples described below.
Example 1
The wire rod for the extra-high strength diamond wire bus comprises the following components in percentage by mass: c:0.92%, si:0.22%, mn:0.34%, P:0.009%, S:0.005%, cr:0.24%, al:0.0009%, ti:0.0004%, O:0.0005%, N:0.0016%; the balance being Fe and unavoidable impurities.
The production of the wire rod for the extra-high strength diamond wire bus in the embodiment comprises the following steps:
smelting molten steel: the special molten iron comprises the following components in percentage by mass: c:4.1%, si:0.23%, P:0.13%, S:0.021%, ti:0.025%, the balance being Fe and unavoidable impurities; s content after pre-desulfurization is 0.005%; the self-produced clean scrap steel is limited to the blank head and the blank tail for producing low-carbon steel or hard wire steel; lime and dolomite are adopted to form slag making materials, and the consumption is 5.1 tons; the steel tapping C content is 0.14 percent, and the P content is 0.012 percent; adding a low-nitrogen carburant in the smelting and tapping process, wherein N is less than or equal to 0.001%; the converter tapping adopts a sliding plate to stop slag.
LF refining: in the refining process, the molten steel is subjected to slag formation twice, wherein the slag formation alkalinity of the first time is 2.4, and the slag formation alkalinity of the second time is 0.8; in the refining process, special ferrosilicon powder for micro aluminum and micro titanium is adopted for component adjustment; the soft blowing time is 65min in the refining process, and the argon flow is 46L/min.
Continuous casting: the continuous casting blank is produced by adopting an eight-machine eight-strand continuous casting machine with the section of 160mm multiplied by 160mm, the superheat degree is 21 ℃, the continuous casting drawing speed is 1.80m/min, the frequency of the tail end electromagnetic stirring current 550A is 10Hz, the specific water quantity of secondary cooling is 1.8L/kg, and the carbon segregation index of the continuous casting blank is detected to be 1.03-1.08.
Grinding a casting blank: and (3) carrying out surface full grinding on all billets, wherein the grinding depth is 2-3mm, and carrying out shot blasting, flaw detection and spot repair after grinding.
Heating: the billet is coated with an anti-oxidation coating before being put into a furnace, and a high-temperature diffusion process is adopted, wherein the soaking temperature is 1165-1190 ℃, the soaking period is 2.5 hours, the furnace pressure is 35Pa, and the residual oxygen content of flue gas is 1.3%.
Rolling: the high-pressure water descaling pressure is 20MPa, the rough rolling start temperature is 1110-1140 ℃, the finish rolling temperature is 920 ℃, and the reducing sizing mill temperature is 935 ℃.
And (3) cooling control: the rolled piece enters a Steyr cooling line after spinning, the spinning temperature is 890 ℃, and the air volumes of 1 # fan and 4# fan are respectively 200000m of maximum air volume 3 95%, 90%, 85% of the speed per hour, the wire rod feeding temperature is 520-550 ℃, and the roller speed is 0.90-1.20m/s.
And (3) checking the prepared wire rod: the average tensile strength of the wire rod is 1295MPa, and the average surface shrinkage is 36%; center segregation is 0 level; the proportion of the 1 grade and the following grain boundary cementite reaches 100 percent, wherein the 0 grade accounts for 80 percent; the surface has local punctiform decarburization, and the total decarburization layer depth is 25 mu m at the maximum; the maximum width of the inclusion is 4 μm, the inclusion ratio below 3 μm is 99.8%, and the brittle inclusion area ratio is 3.3X10 -6 。
And testing the prepared wire rod: when the diamond wire bus with the diameter of 45 μm is produced, 880km of continuous wire is achieved, and the average tensile strength of the diamond wire bus is up to 5100MPa.
Example 2
The wire rod for the extra-high strength diamond wire bus comprises the following components in percentage by mass: c:0.91%, si:0.21%, mn:0.30%, P:0.008%, S:0.007%, cr:0.26%, al:0.0013%, ti:0.0003%, O:0.0006%, N:0.0015%; the balance being Fe and unavoidable impurities.
The production of the wire rod for the extra-high strength diamond wire bus in the embodiment comprises the following steps:
smelting molten steel: the special molten iron comprises the following components in percentage by mass: c:4.3%, si:0.25%, P:0.10%, S:0.025%, ti:0.020%, the balance being Fe and unavoidable impurities; s content after pre-desulfurization is 0.006%; the self-produced clean scrap steel is limited to the blank head and the blank tail for producing low-carbon steel or hard wire steel; lime and dolomite are adopted to form slag making materials, and the consumption is 5.1 tons; the steel tapping C content is 0.13 percent, and the steel tapping P content is 0.013 percent; adding a low-nitrogen carburant in the smelting and tapping process, wherein N is less than or equal to 0.001%; the converter tapping adopts a sliding plate to stop slag.
LF refining: in the refining process, the molten steel is subjected to slag formation twice, wherein the primary slag formation alkalinity is 2.2, and the secondary slag formation alkalinity is 0.9; in the refining process, special ferrosilicon powder for micro aluminum and micro titanium is adopted for component adjustment; the soft blowing time is 60min in the refining process, and the argon flow is 48L/min.
Continuous casting: the method adopts an eight-machine eight-strand continuous casting machine with the section of 160mm multiplied by 160mm to produce, the superheat degree is 22 ℃, the continuous casting pulling speed is 1.80m/min, the frequency of the tail electromagnetic stirring current 550A is 10Hz, the specific water quantity of the secondary cooling is 1.8L/kg, and the carbon segregation index of the detected continuous casting blank is 1.06-1.10.
Grinding a casting blank: and (3) carrying out surface full grinding on all billets, wherein the grinding depth is 2-3mm, and carrying out shot blasting, flaw detection and spot repair after grinding.
Heating: the billet is coated with an anti-oxidation coating before being put into a furnace, and a high-temperature diffusion process is adopted, wherein the soaking temperature is 1160-1195 ℃, the soaking period is 2.6 hours, the furnace pressure is 30Pa, and the residual oxygen content of flue gas is 1.8%.
Rolling: the high-pressure water descaling pressure is 20MPa, the rough rolling start temperature is 1115-1140 ℃, the finish rolling temperature is 930 ℃, and the reducing sizing mill temperature is 925 ℃.
And (3) cooling control: the rolled piece enters a Steyr cooling line after spinning, the spinning temperature is 885 ℃, and the air volumes of 1 # fan and 4# fan are respectively 200000m of maximum air volumes 3 95%, 90%, 85% of the speed per hour, the wire rod feeding temperature is 520-550 ℃, and the roller speed is 0.90-1.20m/s.
And (3) checking the prepared wire rod: a wire rod tensile strength average value 1310MPa and a surface shrinkage average value 34%; center segregation is 0 level; the proportion of the 1 grade and the following grain boundary cementite reaches 100 percent, wherein the 0 grade accounts for 92 percent; the surface has local punctiform decarburization, and the depth of the total decarburization layer is less than 30 mum; the maximum width of the inclusion is 5 mu m, the inclusion ratio below 3 mu m is 99.8%, and the brittle inclusion area ratio is 2.4X10 -6 。
And testing the prepared wire rod: the wire is not broken when the diamond wire bus with the diameter of 43 μm is produced, and the average tensile strength of the diamond wire bus reaches 5150MPa.
Example 3
The wire rod for the extra-high strength diamond wire bus comprises the following components in percentage by mass: c:0.92%, si:0.24%, mn:0.32%, P:0.008%, S:0.009%, cr:0.28%, al:0.0008%, ti:0.0007%, O:0.0008%, N:0.0013%; the balance being Fe and unavoidable impurities.
The production of the wire rod for the extra-high strength diamond wire bus in the embodiment comprises the following steps:
smelting molten steel: the special molten iron comprises the following components in percentage by mass: c:3.9%, si:0.22%, P:0.11%, S:0.023%, ti:0.018%, the balance being Fe and unavoidable impurities; s content after pre-desulfurization is 0.005%; the self-produced clean scrap steel is limited to the blank head and the blank tail for producing low-carbon steel or hard wire steel; lime and dolomite are adopted to form slag making materials, and the consumption is 5.1 tons; the content of steel tapping C is 0.15 percent, and the content of P is 0.011 percent; adding a low-nitrogen carburant in the smelting and tapping process, wherein N is less than or equal to 0.001%; the converter tapping adopts a sliding plate to stop slag.
LF refining: in the refining process, the molten steel is subjected to slag formation twice, wherein the slag formation alkalinity of the first time is 2.1, and the slag formation alkalinity of the second time is 1.0; in the refining process, special ferrosilicon powder for micro aluminum and micro titanium is adopted for component adjustment; the soft blowing time is 66min in the refining process, and the argon flow is 45L/min.
Continuous casting: the continuous casting blank is produced by adopting an eight-machine eight-strand continuous casting machine with the section of 160mm multiplied by 160mm, the superheat degree is 20 ℃, the continuous casting drawing speed is 1.80m/min, the frequency of the tail end electromagnetic stirring current 550A is 10Hz, the specific water quantity of secondary cooling is 1.8L/kg, and the carbon segregation index of the continuous casting blank is detected to be 1.04-1.09.
Grinding a casting blank: and (3) carrying out surface full grinding on all billets, wherein the grinding depth is 2-3mm, and carrying out shot blasting, flaw detection and spot repair after grinding.
Heating: the billet is coated with the anti-oxidation coating before being put into the furnace, and a high-temperature diffusion process is adopted, wherein the soaking temperature is 1155-1185 ℃, the soaking period is 2.5 hours, the furnace pressure is 25Pa, and the residual oxygen content of the flue gas is 1.1%.
Rolling: the high-pressure water descaling pressure is 20MPa, the rough rolling start temperature is 1120-1145 ℃, the finish rolling temperature is 915 ℃, and the reducing sizing mill temperature is 935 ℃.
And (3) cooling control: the rolled piece enters a Steyr cooling line after spinning, the spinning temperature is 880 ℃, and the air volumes of 1 # fan and 4# fan are respectively 200000m of maximum air volumes 3 95%, 90%, 85% of the speed per hour, the wire rod feeding temperature is 510-550 ℃, and the roller speed is 0.90-1.20m/s.
And (3) checking the prepared wire rod: the average tensile strength of the wire rod is 1280MPa, and the average surface shrinkage is 38%; center segregation is 0 level; the proportion of the 1 grade and the following grain boundary cementite reaches 100 percent, wherein the 0 grade accounts for 86 percent; the surface has local punctiform decarburization, and the depth of the total decarburization layer is less than 25 mu m; the maximum width of the inclusion is 4 μm, the inclusion ratio below 3 μm is 99.7%, and the brittle inclusion area ratio is 3.1X10 -6 。
And testing the prepared wire rod: when the diamond wire bus with the diameter of 45 μm is produced, the wire is not broken up to 850km, and the average tensile strength of the diamond wire bus is up to 5080MPa.
Comparative example 1
The comparative wire rod comprises the following components in percentage by mass: c:0.91%, si:0.20%, mn:0.36%, P:0.011%, S:0.008%, cr:0.23%, al:0.0011%, ti:0.0007%, O:0.0011%, N:0.0021%; the balance being Fe and unavoidable impurities.
The production of this comparative example includes:
smelting molten steel: the special molten iron comprises the following components in percentage by mass: c:4.3%, si:0.25%, P:0.15%, S:0.019%, ti:0.023%, the balance being Fe and unavoidable impurities; s content after pre-desulfurization is 0.006%; the self-produced clean scrap steel is limited to the blank head and the blank tail for producing low-carbon steel or hard wire steel; lime and dolomite are adopted to form slag making materials, and the consumption is 5.1 tons; the steel tapping C content is 0.15 percent, and the steel tapping P content is 0.014 percent; adding a low-nitrogen carburant in the smelting and tapping process, wherein N is less than or equal to 0.001%; the converter tapping adopts a sliding plate to stop slag.
LF refining: primary slagging is adopted in the refining process, and the slagging alkalinity is 0.8; in the refining process, special ferrosilicon powder for micro aluminum and micro titanium is adopted for component adjustment; the soft blowing time is 50min in the refining process, and the argon flow is 40L/min.
Continuous casting: the method adopts an eight-machine eight-strand continuous casting machine with the section of 160mm multiplied by 160mm to produce, the superheat degree is 28 ℃, the continuous casting pulling speed is 1.85m/min, the frequency of the tail electromagnetic stirring current 550A is 10Hz, the specific water quantity of the secondary cooling is 1.9L/kg, and the carbon segregation index of the detected continuous casting blank is 1.06-1.15.
Grinding a casting blank: and (5) carrying out corner grinding on all billets.
Heating: soaking temperature is 1100-1150 ℃, soaking period time is 40min, furnace pressure is 20Pa, and residual oxygen content of flue gas is 3.3%.
Rolling: the high-pressure water descaling pressure is 20MPa, the rough rolling start temperature is 1050-1100 ℃, the finish rolling temperature is 920 ℃, and the reducing sizing mill temperature is 935 ℃.
And (3) cooling control: the rolled piece enters a Steyr cooling line after spinning, the spinning temperature is 890 ℃, and the air volumes of 1 # fan and 4# fan are respectively 200000m of maximum air volume 3 95%, 90%, 85% of the speed per hour, the wire rod feeding temperature is 520-550 ℃, and the roller speed is 0.90-1.20m/s.
And (3) checking the prepared wire rod: the average tensile strength of the wire rod is 1285MPa, and the average surface shrinkage is 35%; center segregation is less than or equal to 1 level, wherein 0 level is 60%; the grain boundary cementite is less than or equal to 2 grades, and the 0 grade accounts for 34 percent; the surface has local punctiform decarburization, and the total decarburization layer depth is 55 mu m at the maximum; the maximum width of the inclusion is 15 mu m, the inclusion with the width of 5 mu m or less accounts for 97.9 percent, and the brittle inclusion area accounts for 12.3X10 percent -6 。
And testing the prepared wire rod: when the diamond wire bus with the diameter of 45 μm is produced, the wire is not broken by 90km, and the average tensile strength of the diamond wire bus reaches 5100MPa.
Comparative example 2
The comparative wire rod comprises the following components in percentage by mass: c:0.89%, si:0.22%, mn:0.35%, P:0.009%, S:0.006%, cr:0.25%, al:0.0010%, ti:0.0005%, O:0.0013%, N:0.0024%; the balance being Fe and unavoidable impurities.
The production of this comparative example includes:
smelting molten steel: the special molten iron comprises the following components in percentage by mass: c:4.1%, si:0.25%, P:0.14%, S:0.019%, ti:0.013%, the balance being Fe and unavoidable impurities; s content after pre-desulfurization is 0.005%; the self-produced clean scrap steel is limited to the blank head and the blank tail for producing low-carbon steel or hard wire steel; lime and dolomite are adopted to form slag making materials, and the consumption is 5.0 tons; the steel tapping C content is 0.13 percent, and the P content is 0.012 percent; adding a low-nitrogen carburant in the smelting and tapping process, wherein N is less than or equal to 0.001%; the converter tapping adopts a sliding plate to stop slag.
LF refining: primary slagging is adopted in the refining process, and the slagging alkalinity is 0.9; in the refining process, special ferrosilicon powder for micro aluminum and micro titanium is adopted for component adjustment; the soft blowing time is 53min and the argon flow is 40L/min in the refining process.
Continuous casting: the continuous casting blank is produced by adopting an eight-machine eight-strand continuous casting machine with the section of 160mm multiplied by 160mm, the superheat degree is 32 ℃, the continuous casting drawing speed is 1.90m/min, the frequency of the tail end electromagnetic stirring current is 550A and 10Hz, the specific water quantity of secondary cooling is 1.9L/kg, and the carbon segregation index of the continuous casting blank is detected to be 1.07-1.17.
Grinding a casting blank: and (5) carrying out corner grinding on all billets.
Heating: soaking temperature is 1100-1150 ℃, soaking period time is 38min, furnace pressure is 23Pa, and residual oxygen content of flue gas is 2.8%.
Rolling: the high-pressure water descaling pressure is 20MPa, the rough rolling start temperature is 1050-1100 ℃, the finish rolling temperature is 920 ℃, and the reducing sizing mill temperature is 935 ℃.
And (3) cooling control: the rolled piece enters a Steyr cooling line after spinning, the spinning temperature is 890 ℃, and the air volumes of 1 # fan and 4# fan are respectively 200000m of maximum air volume 3 95%, 90%, 85% of the speed per hour, the wire rod feeding temperature is 520-550 ℃, and the roller speed is 0.90-1.20m/s.
And (3) checking the prepared wire rod: the tensile strength of the wire rod is 1300MPa, and the area shrinkage is 34%; center segregation is less than or equal to 1 level, wherein 0 level is 50%; the grain boundary cementite is less than or equal to 2 grades, and the 0 grade accounts for 42 percent; the surface has local punctiform decarburization, and the total decarburization layer depth is 45 mu m at the maximum; the maximum width of the inclusion is 10 mu m, the inclusion ratio below 5 mu m is 98.7%, and the brittle inclusion area ratio is 10.7X10 -6 。
And testing the prepared wire rod: 130km of continuous wire is achieved when the diamond wire bus with the diameter of 45 μm is produced, and the average tensile strength of the diamond wire bus reaches 5200MPa.
Comparative example 3
The comparative wire rod comprises the following components in percentage by mass: c:0.91%, si:0.24%, mn:0.33%, P:0.010%, S:0.008%, cr:0.24%, al:0.0011%, ti:0.0006%, O:0.0015%, N:0.0023%; the balance being Fe and unavoidable impurities.
The production of this comparative example includes:
smelting molten steel: the special molten iron comprises the following components in percentage by mass: c:3.9%, si:0.25%, P:0.16%, S:0.017%, ti:0.013%, the balance being Fe and unavoidable impurities; s content after pre-desulfurization is 0.005%; the self-produced clean scrap steel is limited to the blank head and the blank tail for producing low-carbon steel or hard wire steel; lime and dolomite are adopted to form slag making materials, and the consumption is 4.9 tons; the steel tapping C content is 0.15 percent, and the steel tapping P content is 0.012 percent; adding a low-nitrogen carburant in the smelting and tapping process, wherein N is less than or equal to 0.001%; the converter tapping adopts a sliding plate to stop slag.
LF refining: primary slagging is adopted in the refining process, and the slagging alkalinity is 0.8; in the refining process, special ferrosilicon powder for micro aluminum and micro titanium is adopted for component adjustment; the soft blowing time is 55min in the refining process, and the argon flow is 40L/min.
Continuous casting: the continuous casting blank is produced by adopting an eight-machine eight-strand continuous casting machine with the section of 160mm multiplied by 160mm, the superheat degree is 26 ℃, the continuous casting drawing speed is 1.80m/min, the frequency of the tail end electromagnetic stirring current 550A is 10Hz, the specific water quantity of secondary cooling is 1.9L/kg, and the carbon segregation index of the continuous casting blank is detected to be 1.06-1.15.
Grinding a casting blank: and (5) carrying out corner grinding on all billets.
Heating: soaking temperature is 1100-1150 ℃, soaking period time is 42min, furnace pressure is 30Pa, and residual oxygen content of flue gas is 3.0%.
Rolling: the high-pressure water descaling pressure is 20MPa, the rough rolling start temperature is 1050-1100 ℃, the finish rolling temperature is 920 ℃, and the reducing sizing mill temperature is 935 ℃.
And (3) cooling control: the rolled piece enters a Steyr cooling line after spinning, the spinning temperature is 890 ℃, and the air volumes of 1 # fan and 4# fan are respectively 200000m of maximum air volume 3 95%, 95% of/h,90 percent and 85 percent of the wire rod feeding temperature is 520 to 550 ℃, and the roller speed is 0.90 to 1.20m/s.
And (3) checking the prepared wire rod: the average tensile strength of the wire rod is 1290MPa, and the average surface shrinkage is 36%; center segregation is less than or equal to 1 level, wherein 0 level is 75%; the grain boundary cementite is less than or equal to 2 grades, and the 0 grade accounts for 38 percent; the surface has local punctiform decarburization, and the total decarburization layer depth is 60 mu m at the maximum; the maximum width of the inclusion is 12 mu m, the inclusion ratio below 5 mu m is 98.5%, and the brittle inclusion area ratio is 14.8X10 -6 。
And testing the prepared wire rod: when the diamond wire bus with the diameter of 45 μm is produced, 78km of the wire is not broken, and the average tensile strength of the diamond wire bus reaches 5100MPa.
Center segregation, grain boundary cementite, decarburized layer, inclusion and wire breakage length of the wire rod finished products prepared in examples 1 to 3 and comparative examples 1 to 3 were examined, respectively. The detection method of the center segregation, the grain boundary cementite and the total decarburized layer comprises the following steps: a coil rod is randomly selected in each embodiment and comparative example, a section of sample is cut every 2 circles from each coil rod, 50 samples are cut, the cross section of the cut sample is cut, polished and corroded by 4% nitrate alcohol, then the center segregation, grain boundary cementite and total decarburized layer of each sample are observed and counted through a metallographic microscope, the highest level and proportion of the center segregation and grain boundary cementite project are counted, and the maximum value of the total decarburized layer is recorded.
The method for detecting the inclusion comprises the following steps: each embodiment and each comparative example randomly selects a coil rod, each coil rod cuts a section of sample, and a longitudinal section sample is prepared for the sampled sample, so that the total area of the longitudinal section is not less than 500mm 2 And then polishing, cleaning after polishing, air-drying, carrying out surface scanning on the longitudinal section by using an ASPEX inclusion analysis system, and counting the maximum width of the inclusions, the quantity ratio of the inclusions with the width less than or equal to 3 mu m, the area ratio of the brittle inclusions (the length-width ratio less than or equal to 3) and the like according to the scanning result.
The statistical method of the broken wire length comprises the following steps: the specification, total length and number of broken wires in the production process of the production diamond wire bus are recorded, and the broken wire length (broken wire length=total length of production of the same specification diamond wire bus/(number of broken wires in the production process) is calculated.
The statistical results are shown in table 1 below:
TABLE 1
The center segregation of the wire rod prepared by the embodiment of the invention is stabilized at the level of 0 level, the proportion of the grain boundary cementite which is less than or equal to 1 level reaches 100%, and the decarburized layer is stabilized below 30 mu m.
The invention adopts an ASPEX inclusion analysis system to detect the inclusion of the wire rod, the detected photos are shown in figure 1, and the inclusion detection photos in examples 2-3 and comparative examples 1-3 are similar to example 1. The ASPEX inclusion analysis system can rapidly scan all inclusions in a set area, the scanning precision can reach 30nm, the length, the width, the area and the component composition of all the inclusions can be counted, and compared with the traditional metallographic examination, the ASPEX inclusion analysis system has the advantages of higher speed, higher scanning precision and accuracy, and can more comprehensively reflect the quality level of the inclusions in steel. The maximum width of the inclusion of the wire rod manufactured by the embodiment of the invention is less than 5 mu m, the inclusion ratio of 3 mu m or below reaches more than 99.7 percent, and the total area ratio of brittle inclusion is less than 3.5x10 -6 。
The wire rod manufactured by the embodiment of the invention is drawn into a steel wire with phi 43-45 mu m, and the statistical broken wire length reaches more than 850 km.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. The production method of the wire rod for the ultra-high strength diamond wire bus is characterized by comprising the following chemical components in percentage by mass: c:0.90 to 0.95 percent, si:0.17 to 0.25 percent, mn:0.20 to 0.40 percent, cr:0.20 to 0.35 percent, S is less than or equal to 0.010 percent, P is less than or equal to 0.015 percent, al is less than or equal to 0.002 percent, ti is less than or equal to 0.001 percent, O is less than or equal to 0.0008 percent, N is less than or equal to 0.0020 percent, and the balance is Fe and unavoidable impurity elements;
the production method comprises the following steps:
smelting molten steel: smelting by adopting molten iron, controlling the tapping oxygen content to be less than or equal to 0.050 percent, controlling the terminal phosphorus to be less than or equal to 0.012 percent, and controlling the sulfur to be less than or equal to 0.012 percent;
LF refining: adopting high-alkalinity slag, wherein the alkalinity of primary slag formation is 2.1-2.4; adopting low-alkalinity slag, wherein the alkalinity of secondary slag forming is 0.8-1.0; when soft blowing is carried out, the argon flow is 45-48L/min, and the soft blowing time is more than or equal to 60min;
continuous casting; adopting square billet sections with the sizes of 160mm multiplied by 160mm to produce, adopting an integral nozzle to pour, controlling the continuous casting drawing speed to be 1.8m/min, and controlling the superheat degree to be 15-25 ℃; adopting crystallizer electromagnetic stirring and terminal electromagnetic stirring, wherein the current of the terminal electromagnetic stirring is 450-600A, and the frequency is 6-12Hz;
heating; adopting a high-temperature diffusion process, wherein the total heating time is more than or equal to 6 hours; wherein the soaking temperature is 1150-1200 ℃, the soaking period time is 2.5-2.6h, the furnace pressure is not lower than 20Pa, and the residual oxygen content of the flue gas is 0.5-3%; before the heating process, the surface of the billet is coated with an anti-oxidation coating before entering the furnace;
rolling steel; the square billet subjected to high-temperature diffusion is subjected to the procedures of high-pressure water descaling, rough rolling, middle rolling, pre-finish rolling, finish rolling and reducing sizing in sequence to obtain a wire rod;
and (3) cooling control: the rolled wire rod enters a Steyr air cooling line for cooling after spinning;
in the continuous casting process, two-cooling full-water forced cooling is adopted, and the specific water quantity of the two-cooling is controlled to be 1.6-1.8L/kg;
in the continuous casting process, the carbon segregation index of the continuous casting billet is 1.00-1.10;
in the steel rolling process, the descaling pressure of high-pressure water is more than or equal to 20Mpa; the initial rolling temperature of rough rolling is 1100-1150 ℃; the finish rolling temperature is 890-930 ℃, the reducing sizing temperature is 910-950 ℃, and the dimensional accuracy of the wire rod is controlled to reach the C-level accuracy;
in the cooling control process, the spinning temperature is controlled to 870-900 ℃, and the maximum air quantity of a fan is 200000m 3 And/h, the roller way speed is 0.90-1.20m/s;
in the cooling control procedure, when the temperature of the wire rod is reduced to below 550 ℃, a heat preservation cover is covered;
the center segregation 0-level proportion of the wire rod for the extra-high-strength diamond wire bus manufactured by the production method of the wire rod for the extra-high-strength diamond wire bus reaches 100%;
the ratio of the 1 grade and the following grain boundary cementite reaches 100 percent;
the total decarburized layer depth is less than 30 mu m;
the inclusion maximum width is less than or equal to 5 mu m, the inclusion ratio of the width of 3 mu m or below reaches more than 99.7 percent, and the brittle inclusion area ratio is less than or equal to 3.5X10 -6 ；
The ultra-high strength diamond wire bus can stably reach more than 850km for continuous wire when being used for producing the diamond wire bus with the diameter of 43-45 mu m.
2. The method for producing a wire rod for ultra-high strength diamond wire bus bar according to claim 1, wherein in the molten steel smelting process, the chemical composition of molten iron comprises, in mass percent: c: 3.9-4.3%, si: 0.22-0.25%, P: 0.10-0.13%, S: 0.021-0.025%, ti: 0.018-0.025%, and the balance being Fe and unavoidable impurities;
in the molten steel smelting process, self-produced scrap steel is adopted to ensure the cleanliness of steel and iron materials fed into the furnace;
in the molten steel smelting process, the converter adopts two slag forming processes, so that the phosphorus content is reduced by less than or equal to 0.10%;
in the molten steel smelting process, the converter is deoxidized by adopting silicon after the converter.
3. The method for producing a wire rod for ultra-high strength diamond wire bus bars according to claim 1, characterized in that in the LF refining process, micro aluminum micro titanium ferrosilicon powder is used for component adjustment.
4. The method for producing a wire rod for ultra-high strength diamond wire bus bar according to claim 1, further comprising a cast slab grinding process performed before the heating process;
the casting blank coping process comprises the following steps: and (3) carrying out surface full polishing on the surface of the steel billet, polishing the steel billet to a depth of 2-3mm, carrying out shot blasting after polishing to remove burrs generated during polishing, and then carrying out flaw detection and spot polishing of local defects.
5. A wire rod for an ultra-high strength diamond wire bus, characterized in that the wire rod is manufactured by the manufacturing method of the wire rod for the ultra-high strength diamond wire bus according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311125991.1A CN116891977B (en) | 2023-09-04 | 2023-09-04 | Wire rod for extra-high-strength diamond wire bus and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311125991.1A CN116891977B (en) | 2023-09-04 | 2023-09-04 | Wire rod for extra-high-strength diamond wire bus and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116891977A CN116891977A (en) | 2023-10-17 |
| CN116891977B true CN116891977B (en) | 2023-11-21 |
Family
ID=88315121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311125991.1A Active CN116891977B (en) | 2023-09-04 | 2023-09-04 | Wire rod for extra-high-strength diamond wire bus and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116891977B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230008A (en) * | 2019-06-26 | 2019-09-13 | 江苏省沙钢钢铁研究院有限公司 | The production method of ultra-fine extra-high strength wire, wire rod and wire rod |
| CN110318001A (en) * | 2019-06-27 | 2019-10-11 | 江苏省沙钢钢铁研究院有限公司 | A kind of diamond wire bus high-carbon steel and its method of smelting |
| CN111187992A (en) * | 2020-02-26 | 2020-05-22 | 江苏省沙钢钢铁研究院有限公司 | Production method of continuous casting billet of wire rod for cutting diamond wire |
| CN111534753A (en) * | 2020-05-22 | 2020-08-14 | 江苏永钢集团有限公司 | Chromium alloyed cord steel wire rod and production process thereof |
| CN112011742A (en) * | 2020-10-22 | 2020-12-01 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 5000MPa grade diamond wire and production method thereof |
| CN112359277A (en) * | 2020-10-15 | 2021-02-12 | 中天钢铁集团有限公司 | Control method for segregation and net carbon of 86-level high-strength cord steel wire rod |
| CN113088818A (en) * | 2021-03-31 | 2021-07-09 | 江苏省沙钢钢铁研究院有限公司 | Ultra-high strength steel cord, wire rod for ultra-high strength steel cord and production method thereof |
| CN114318149A (en) * | 2021-12-28 | 2022-04-12 | 张家港荣盛特钢有限公司 | Grade 102 steel cord, grade 102 cord steel wire rod and production method thereof |
| CN115874115A (en) * | 2022-12-16 | 2023-03-31 | 江苏联峰实业有限公司 | Wire rod for steel wire of ultra-high strength phi-less than or equal to 0.30 ST-grade rubber tube and production process |
| CN115976415A (en) * | 2022-12-30 | 2023-04-18 | 江苏永钢集团有限公司 | Ultra-high strength 85-grade cord steel wire rod and production method thereof |
-
2023
- 2023-09-04 CN CN202311125991.1A patent/CN116891977B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230008A (en) * | 2019-06-26 | 2019-09-13 | 江苏省沙钢钢铁研究院有限公司 | The production method of ultra-fine extra-high strength wire, wire rod and wire rod |
| CN110318001A (en) * | 2019-06-27 | 2019-10-11 | 江苏省沙钢钢铁研究院有限公司 | A kind of diamond wire bus high-carbon steel and its method of smelting |
| CN111187992A (en) * | 2020-02-26 | 2020-05-22 | 江苏省沙钢钢铁研究院有限公司 | Production method of continuous casting billet of wire rod for cutting diamond wire |
| CN111534753A (en) * | 2020-05-22 | 2020-08-14 | 江苏永钢集团有限公司 | Chromium alloyed cord steel wire rod and production process thereof |
| CN112359277A (en) * | 2020-10-15 | 2021-02-12 | 中天钢铁集团有限公司 | Control method for segregation and net carbon of 86-level high-strength cord steel wire rod |
| CN112011742A (en) * | 2020-10-22 | 2020-12-01 | 江苏省沙钢钢铁研究院有限公司 | Wire rod for 5000MPa grade diamond wire and production method thereof |
| CN113088818A (en) * | 2021-03-31 | 2021-07-09 | 江苏省沙钢钢铁研究院有限公司 | Ultra-high strength steel cord, wire rod for ultra-high strength steel cord and production method thereof |
| CN114318149A (en) * | 2021-12-28 | 2022-04-12 | 张家港荣盛特钢有限公司 | Grade 102 steel cord, grade 102 cord steel wire rod and production method thereof |
| CN115874115A (en) * | 2022-12-16 | 2023-03-31 | 江苏联峰实业有限公司 | Wire rod for steel wire of ultra-high strength phi-less than or equal to 0.30 ST-grade rubber tube and production process |
| CN115976415A (en) * | 2022-12-30 | 2023-04-18 | 江苏永钢集团有限公司 | Ultra-high strength 85-grade cord steel wire rod and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116891977A (en) | 2023-10-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108866271B (en) | Method for manufacturing high-silicon titanium-containing austenitic stainless steel pipe blank | |
| CN115074604B (en) | Spring steel wire rod and production method thereof | |
| RU2765963C1 (en) | Acid- and corrosion-resistant steel for pipeline with large wall thickness and method of production thereof | |
| CN110055459B (en) | Medium-alloy ultrahigh-strength-toughness rare earth steel and preparation method thereof | |
| US20090038439A1 (en) | Process for producing steel for high-carbon steel wire material with excellent drawability and fatique characteristics | |
| CN110117748B (en) | Cutting steel wire, steel material for cutting steel wire, and method for producing same | |
| CN104212934A (en) | Control method for titanium nitride inclusion of gear steel bar material | |
| CN111593161A (en) | Smelting method of ultralow-nitrogen low-alloy steel | |
| JP2007319872A (en) | Method for producing high-s free cutting steel wire rod | |
| CN111471821A (en) | Production method of pure steel capable of avoiding unqualified flaw detection | |
| CN113502434B (en) | Aviation 30CrMnSiNi2A high-strength steel and production method thereof | |
| CN114645188A (en) | Method for efficiently producing hot-rolled steel strip for 2-4 mm extreme thin-specification high-quality stirring tank with tensile strength of 650MPa | |
| CN116891977B (en) | Wire rod for extra-high-strength diamond wire bus and production method thereof | |
| KR100886046B1 (en) | Method for producing extremely low carbon steel sheet and extremely low carbon cast piece having excellent surface characteristics, workability and formability | |
| JP5332568B2 (en) | Denitrification method for molten steel | |
| CN103225009A (en) | Method for producing high-cleanness steel | |
| CN114807505A (en) | Method for adding rare earth element into wheel steel | |
| JP4586648B2 (en) | Steel plate excellent in workability and method for producing the same | |
| JP3537685B2 (en) | Slab for thin steel sheet with less inclusion defect and method for producing the same | |
| JP4034700B2 (en) | Manufacturing method of high S free cutting steel with excellent machinability and high S free cutting steel | |
| CN112501405A (en) | Method for solving difficult cutting processing of carbon structural steel and carbon structural steel prepared by method | |
| CN115478219B (en) | Low-magnetic deformed steel bar for building and preparation method thereof | |
| KR101676144B1 (en) | Medium carbon free cutting steel having hot workability and method for manufacturing the same | |
| KR20200075651A (en) | Refining method of high-purity molten steel | |
| JP3542913B2 (en) | Slab for thin steel sheet with less inclusion defect and method for producing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |