CN115125437A - Steel for ultrahigh-strength smooth-surface prestressed steel strand and preparation method thereof - Google Patents
Steel for ultrahigh-strength smooth-surface prestressed steel strand and preparation method thereof Download PDFInfo
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- CN115125437A CN115125437A CN202210663243.8A CN202210663243A CN115125437A CN 115125437 A CN115125437 A CN 115125437A CN 202210663243 A CN202210663243 A CN 202210663243A CN 115125437 A CN115125437 A CN 115125437A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 266
- 239000010959 steel Substances 0.000 title claims abstract description 266
- 238000002360 preparation method Methods 0.000 title claims abstract description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 89
- YXTPWUNVHCYOSP-UHFFFAOYSA-N bis($l^{2}-silanylidene)molybdenum Chemical compound [Si]=[Mo]=[Si] YXTPWUNVHCYOSP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 229910021343 molybdenum disilicide Inorganic materials 0.000 claims abstract description 47
- 229910052742 iron Inorganic materials 0.000 claims abstract description 38
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 28
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000007664 blowing Methods 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052786 argon Inorganic materials 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 13
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 10
- 238000007670 refining Methods 0.000 claims abstract description 10
- 238000005275 alloying Methods 0.000 claims abstract description 9
- 238000005098 hot rolling Methods 0.000 claims abstract description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 59
- 239000011777 magnesium Substances 0.000 claims description 59
- 229910052749 magnesium Inorganic materials 0.000 claims description 59
- 239000002245 particle Substances 0.000 claims description 34
- 239000000843 powder Substances 0.000 claims description 31
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 25
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 25
- 239000004571 lime Substances 0.000 claims description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 23
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000011812 mixed powder Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 4
- 238000009694 cold isostatic pressing Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims 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 15
- 230000000052 comparative effect Effects 0.000 description 14
- 229910052782 aluminium Inorganic materials 0.000 description 10
- 229910052710 silicon Inorganic materials 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 8
- 238000005728 strengthening Methods 0.000 description 8
- 229910052717 sulfur Inorganic materials 0.000 description 8
- 239000011593 sulfur Substances 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 238000004321 preservation Methods 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 5
- 229910052720 vanadium Inorganic materials 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 229910001567 cementite Inorganic materials 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 239000011733 molybdenum Substances 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 229910017311 Mo—Mo Inorganic materials 0.000 description 1
- 229910017305 Mo—Si Inorganic materials 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 239000002699 waste material Substances 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The application relates to the technical field of steel smelting, and particularly discloses steel for an ultrahigh-strength smooth-surface prestressed steel strand and a preparation method thereof. The steel for the steel strand comprises graphite powder, chromium powder, vanadium powder, titanium powder, molybdenum disilicide, manganese powder and the balance of iron powder; the preparation method comprises the following steps: preparing molten iron, smelting molten steel, deoxidizing and alloying, blowing argon for refining, casting the molten steel, heating and hot rolling steel billets, and controlling cooling. The steel for the steel strand can be used for producing the steel strand, and has the advantages of improving the sorbitizing rate and strength of the steel for the steel strand.
Description
Technical Field
The application relates to the technical field of steel smelting, in particular to steel for an ultrahigh-strength smooth-surface prestressed steel strand and a preparation method thereof.
Background
The prestressed steel strand is a stranded steel cable made of high-strength steel wires, and is subjected to stress relief treatment, so that the prestressed steel strand is suitable for prestressed concrete and similar purposes. The prestressed steel strand has the main characteristics of high strength, good relaxation, straightening when unfolded and high yield strength.
The common prestressed steel strand is mainly made of steel for cold-drawn steel strands, and in the related technology, the steel for the steel strands has insufficient strength, is easy to break in the drawing process, and is difficult to meet the use requirements for producing the steel strands.
Disclosure of Invention
In order to improve the sorbitizing rate and the strength of the steel for the steel strand, the application provides the steel for the ultra-high-strength smooth-surface prestressed steel strand and the preparation method thereof.
In a first aspect, the present application provides a steel for steel strand, which adopts the following technical scheme:
the steel for the steel strand comprises the following raw materials in percentage by weight:
graphite powder: 0.60-1.20%, chromium powder: 0.20-0.30%, vanadium powder: 0.30-0.70%, titanium powder: 0.10-0.30%, molybdenum disilicide: 0.80-1.80%, manganese powder: 0.60-1.00 percent, and the balance being iron powder.
By adopting the technical scheme, the graphite powder provides carbon element for the molten steel, austenite is formed in the production process of the steel, the strength, hardness and hardenability of the steel are increased along with the increase of the content of the carbon element, so that the section performance of the steel for the steel strand tends to be consistent, and the steel can be cooled in a mild mode; the chromium powder and the vanadium powder provide chromium elements and vanadium elements for a microalloy strengthening technology, the chromium microalloy strengthening can prolong the incubation period of pearlite transformation in a proper amount, improve the hardenability of austenite, and delay the pearlite transformation to a low-temperature stage under the condition of continuous cooling, so that a fine pearlite structure is obtained on a stelmor production line, and the tensile strength of steel for steel strands is improved.
Vanadium is a strong carbide forming element and can be combined with carbon and nitrogen in steel, and the formed compound has the thermodynamic properties of high-temperature dissolution and low-temperature precipitation, and can inhibit the growth of austenite grains in the heating and rolling processes, increase the grain boundaries, prevent plastic deformation and improve the strength and toughness of the steel, wherein the atomic arrangement on the grain boundaries is irregular; in the cooling process, the compound is separated out by dispersed particles to generate a precipitation strengthening effect, and simultaneously, the vanadium element inhibits the formation of grain boundary network cementite in hypereutectoid steel, increases the nucleation rate of the grain boundary cementite, improves the sorbite rate, prevents the long-range diffusion of carbon, ensures that continuous cementite is not easy to form, reduces the brittleness of steel for steel strands and improves the quenching uniformity.
The titanium powder provides titanium element for the steel, improves the toughness and yield strength of the steel, the titanium element has strong affinity with carbon, oxygen and nitrogen, and plays a role in deoxidation and denitrification, and the compound of titanium and carbon is slowly dissolved in the steel at high temperature, so that the internal structure of the steel is compact, the growth and coarsening of crystal grains are prevented, and the strength and the toughness of the steel for the steel strand are further improved; the manganese powder is desulfurized and deoxidized in the preparation process of the steel, the hot processing performance of the steel for the steel strand is improved, the hardness, the strength and the wear resistance of the steel for the steel strand are improved, and the quality of a steel strand product is improved.
The molybdenum disilicide has the effects of low-temperature toughness and high-temperature reinforcement, the strength and the toughness of the steel for the steel strand are improved, meanwhile, the molybdenum disilicide reacts with oxygen elements to remove oxygen in the steel and form molybdenum oxide and silicon dioxide, the molybdenum oxide reacts with hydrogen elements at high temperature to form a molybdenum simple substance, crystal grains are refined, the hardenability of the steel for the steel strand is improved, and the strength and the toughness of the steel are improved; the generated silicon dioxide is lighter than the molten steel, floats on the surface of the molten steel and enters slag, oxygen in the molten steel is removed, and the strength of the steel for the steel strand is improved.
Preferably, the steel for the steel strand comprises the following raw materials in percentage by weight: graphite powder: 0.70-1.10%, chromium powder: 0.23-0.27%, vanadium powder: 0.40-0.60%, titanium powder: 0.15-0.25%, molybdenum disilicide: 1.00-1.60%, manganese powder: 0.70-0.90 percent, and the balance of iron powder.
By adopting the technical scheme, the proportion of each component is optimized, the sorbitizing rate of the steel for the steel strand is further improved, the grain size is refined, the tensile strength of the steel for the steel strand is higher, the hardenability and the toughness of the steel for the steel strand are improved, and the quality of the prepared steel strand is improved.
Preferably, the molybdenum disilicide is modified molybdenum disilicide, and the modified molybdenum disilicide is prepared by alloying molybdenum disilicide with aluminum powder.
By adopting the technical scheme, weak Mo-Mo metal bonds and strong Mo-Si covalent bonds exist in the molybdenum disilicide, the strong covalent bonds enable the molybdenum disilicide to generate brittleness, and after the molybdenum disilicide is alloyed by aluminum powder, the aluminum element replaces the silicon element, so that the covalent bonds of the molybdenum disilicide are reduced, and the brittleness of the molybdenum disilicide is reduced; aluminum and molybdenum disilicide form a substitutional solid solution to cause lattice distortion, and the interaction between solute atoms and dislocation plays a role in solid solution strengthening; the modified molybdenum disilicide contains fine Mo (Al, Si) 2 The second phase particles increase the interface and play a role in strengthening particles; cracks and solid solution of aluminum and Mo (Al, Si) 2 The second phase particles interact to cause crack bridging and deflection, and the fracture toughness is enhanced; the addition of aluminum absorbs oxygen in molten steel, and the formed aluminum oxide plays a role in pinning dislocation motion, reduces brittle silicon dioxide phase at crystal boundary, and improves the bending strength and fracture toughness of molybdenum disilicideThe strength and the toughness of the steel for the steel strand are improved in one step.
Preferably, the modified molybdenum disilicide consists of aluminum powder and molybdenum disilicide according to the weight ratio (0.5-1.5): (1.5-2.5), the modified molybdenum disilicide is prepared by the following steps:
a1, mixing and grinding aluminum powder and molybdenum disilicide to obtain mixed powder;
a2, carrying out heat treatment on the mixed powder prepared from A1 under the protection of hydrogen to prepare the treated mixed powder;
a3, grinding the treated mixed powder prepared from the A2 under the protection of argon, and carrying out cold isostatic pressing treatment to prepare treated powder;
a4, sintering the treated powder prepared by the A3 to prepare the modified molybdenum disilicide.
By adopting the technical scheme, the modified molybdenum disilicide of the aluminum powder alloying molybdenum disilicide is prepared by the steps of mixing and grinding, heat treatment, cold isostatic pressing treatment, sintering and the like of the aluminum powder and the molybdenum disilicide, the brittleness of the molybdenum disilicide is improved, meanwhile, the fracture toughness of the molybdenum disilicide is enhanced, the brittle silicon dioxide phase at a crystal boundary is reduced, the bending strength and the fracture toughness of the molybdenum disilicide are improved, and the strength and the toughness of the steel for the steel strand are further improved.
Preferably, in the step a2, the heat treatment step is: heating the mixed powder prepared in the step A1 to 900-1100 ℃ and preserving the heat for 20-40 min.
By adopting the technical scheme, the heat preservation time is 20-40min, so that the silicon element is fully replaced by the aluminum element, the number of covalent bonds in the molybdenum disilicide is reduced, the brittleness of the molybdenum disilicide is reduced, the influence of the brittleness of the molybdenum disilicide on the steel for the steel strand is reduced, and the strength and the toughness of the steel for the steel strand are improved by the molybdenum disilicide; when the heat preservation time is less than 20min, the silicon element is not fully replaced by aluminum, the brittleness of molybdenum disilicide is not thoroughly improved, and the prepared steel for the steel strand is easy to break, so that the quality of the prepared steel strand is influenced; when the heat preservation time is longer than 40min, the aluminum element fully replaces the silicon element, and the performance of the modified molybdenum disilicide is not improved along with the increase of the heat preservation time, so that the waste of resources is easily caused.
In a second aspect, the present application provides a method for preparing steel for a steel strand, which adopts the following technical scheme:
a preparation method of steel for a steel strand comprises the following steps:
s1, preparing molten iron: melting iron powder and preparing molten iron;
s2, smelting molten steel: adding titanium powder, molybdenum disilicide, graphite powder and manganese powder into the pretreated molten iron prepared in the step S1 for smelting, and blowing oxygen into the molten iron to prepare molten steel;
s3, deoxidizing and alloying: tapping the molten steel prepared in the S2, and adding chromium powder and vanadium powder to prepare deoxidized and alloyed molten steel;
s4, argon blowing refining: refining the deoxidized and alloyed molten steel prepared in the step S3 and blowing argon gas into the molten steel to prepare refined molten steel;
s5, casting molten steel: continuously casting the refined molten steel prepared in the step S4 to prepare a billet;
s6, heating and hot rolling of steel billets: heating the billet prepared in the step S5 at 1100-1200 ℃ to prepare a heated billet, and rolling the heated billet to prepare a rolled billet;
s7, cooling control: and (4) cooling the rolled billet obtained in the step (S6) to obtain the steel for the steel strand.
By adopting the technical scheme, the steel for the steel strand is prepared by preparing molten iron, smelting molten steel, deoxidizing and alloying, blowing argon and refining, casting the molten steel, heating and hot rolling a billet, controlling cooling and the like from graphite powder, chromium powder, vanadium powder, titanium powder, molybdenum disilicide, manganese powder, iron powder and a pretreating agent, and the prepared steel for the steel strand has the advantages of high sorbitizing rate, refined crystal grains, reduced sorbite sheet interlayer spacing and high tensile strength and toughness, so that the quality of the prepared steel strand product is improved; when argon is blown into molten steel, bubbles flow through the molten steel, aluminum oxide generated by reaction of oxygen, nitrogen, hydrogen, aluminum powder and oxygen and inclusions formed in the molten steel are attached to the surfaces of the bubbles and float upwards along with the bubbles, so that the bubbles are separated from the molten steel, harmful substances in the molten steel are reduced, and the strength and the toughness of the steel for the steel strand are improved.
Preferably, the molten iron in the step S1 is pretreated molten iron obtained by blowing 34 to 38% of a pretreatment agent by a blowing method, the pretreatment agent is prepared by adding lime powder to magnesium particles, and the weight ratio of the magnesium particles to the lime powder is (1 to 3): (0.5-1.5).
By adopting the technical scheme, when the iron powder is pretreated by the pretreating agent, the magnesium particles and the lime powder are used as the pretreating agent in a composite way, in the step of pretreating the molten iron, the magnesium particles are vaporized when being added into the molten iron, at the moment, the lime powder removes sulfur elements and phosphorus elements in the molten iron, and simultaneously, the lime powder plays a role of a dispersing agent, so that splashing caused by instant vaporization of a large amount of magnesium is avoided as much as possible; the lime powder can form a large number of bubble forming centers, so that the floating speed of magnesium bubbles is reduced, the speed of dissolving magnesium in molten iron is increased, and the utilization rate of magnesium is improved; magnesium bubbles formed after magnesium grains are vaporized firstly react with oxygen element in molten iron, and after the reaction is finished, magnesium simple substance and magnesium element simultaneously react with sulfur element to remove the sulfur element in the molten iron, thereby reducing the influence of harmful elements in the molten iron on the strength and toughness of the steel for the steel strand.
Preferably, the magnesium particles are passivated magnesium particles, and the passivated magnesium particles are prepared by the following steps:
and (3) immersing the magnesium grains into 8-10g/L hydrofluoric acid, taking out after immersing for 20-40s, cleaning and drying to obtain the passivated magnesium grains.
By adopting the technical scheme, a compact oxide film is formed on the surface of the passivated magnesium grains, so that the reaction of magnesium and impurities in the air before desulfurization is reduced, and the utilization rate of the magnesium grains is improved.
In summary, the present application has the following beneficial effects:
1. the graphite powder forms austenite in the production process of the steel, and the strength, hardness and hardenability of the steel are all increased; the chromium element improves hardenability, obtains fine pearlite structure and improves the tensile strength of the steel for the steel strand; the compound formed by vanadium element, carbon and nitrogen element can inhibit the growth of austenite crystal grains and improve the strength and toughness of steel; the precipitation strengthening effect is generated in the cooling process, the vanadium element increases the nucleation rate of grain boundary cementite, improves the sorbite rate, reduces the brittleness of steel for the steel strand and improves the quenching uniformity; the titanium powder is deoxidized and denitrified, so that the strength and the toughness of the steel for the steel strand are improved; the manganese powder improves the hardness, strength and wear resistance of the steel for the steel strand; the molybdenum disilicide has low-temperature toughness and high-temperature reinforcement, reacts with oxygen to refine grains, improves the hardenability of the steel for the steel strand and improves the strength and toughness of the steel.
2. The brittleness of the molybdenum disilicide is generated, and after the aluminum powder is alloyed with the molybdenum disilicide, the aluminum element replaces the silicon element, so that the brittleness of the molybdenum disilicide is reduced; causing lattice distortion and playing a role in solid solution strengthening; fine Mo (Al, Si) 2 The second phase particles of (a) play a role in particle strengthening; cracks and solid solution of aluminum and Mo (Al, Si) 2 The second phase particles interact to enhance fracture toughness; the aluminum absorbs oxygen in the molten steel, and the aluminum oxide plays a role in pinning dislocation movement, so that the bending strength and fracture toughness of the molybdenum disilicide are improved, and the strength and toughness of the steel for the steel strand are further improved.
3. Magnesium particles are vaporized when being added into molten iron, and the lime powder removes sulfur elements and phosphorus elements in the molten iron, and simultaneously plays a role of a dispersing agent to avoid magnesium splashing as much as possible; the lime powder reduces the floating speed of magnesium bubbles and accelerates the speed of dissolving magnesium in molten iron; after magnesium bubbles formed after magnesium grains are vaporized react with oxygen in molten iron, elemental magnesium and the elemental magnesium simultaneously remove sulfur in the molten iron, and the influence of harmful elements in the molten iron on the strength and toughness of the steel for the steel strand is reduced.
Detailed Description
The present application will be described in further detail with reference to examples.
Starting materials
The starting materials used in the examples of the present application are all commercially available. Wherein, the content of silicon in the molybdenum disilicide is 66 percent, and the content of molybdenum is 33 percent. The iron powder contains 70% of iron, less than or equal to 0.02% of sulfur, less than or equal to 0.03% of phosphorus, 99% of magnesium in magnesium particles and 60% of calcium oxide in lime powder.
Preparation example
Preparation example 1
The preparation method of the modified molybdenum disilicide comprises the following steps:
a1, mixing and grinding 0.5kg of aluminum powder and 1.5kg of molybdenum disilicide to prepare mixed powder;
a2, heating the mixed powder prepared from A1 to 1000 ℃ under the protection of hydrogen and preserving heat for 40min to prepare the treated mixed powder;
a3, grinding the treated mixed powder prepared from A2 under the protection of argon, and carrying out cold isostatic pressing treatment to prepare treated powder;
a4, sintering the treated powder prepared by the A3 to prepare the modified molybdenum disilicide.
Preparation examples 2 to 3
Different from preparation example 1, the raw material ratios and the holding times in preparation examples 2 to 3 are different, and the details are shown in Table 1.
TABLE 1 raw material compounding ratio and holding time of production examples 1 to 3
| Aluminum powder/kg | Molybdenum disilicide per kg | Holding time/min | |
| Preparation example 1 | 0.5 | 1.5 | 40 |
| Preparation example 2 | 1.0 | 2.0 | 30 |
| Preparation example 3 | 1.5 | 2.5 | 20 |
Preparation example 4
The preparation method of the passivated magnesium particles comprises the following steps:
and (3) immersing the magnesium grains into 9g/L hydrofluoric acid, taking out the magnesium grains after immersion for 20s, cleaning and airing to obtain the passivated magnesium grains.
Preparation example 5
Unlike preparation example 4, the immersion time was 30 s.
Preparation example 6
Unlike preparation example 4, the immersion time was 40 s.
Preparation example 7
The preparation method of the pretreating agent comprises the following steps:
1kg of magnesium particles and 1.5kg of lime powder are mixed to prepare the pretreating agent.
Preparation example 8
2kg of magnesium particles and 1kg of lime powder are mixed to prepare the pretreating agent.
Preparation example 9
3kg of magnesium particles and 0.5kg of lime powder are mixed to prepare the pretreating agent.
Preparation examples 10 to 12
In contrast to preparation 8, the magnesium particles were replaced by the same amount of passivated magnesium particles from preparations 4 to 6.
Examples
Example 1
The preparation method of the steel for the steel strand comprises the following steps:
s1, molten iron preparation: 95.70kg of iron powder is melted and molten iron is prepared;
s2, smelting molten steel: adding 0.10kg of titanium powder, 1.80kg of molybdenum disilicide, 1.20kg of graphite powder and 0.60kg of manganese powder into the molten iron prepared in the step S1 for smelting, and blowing oxygen into the molten iron to prepare molten steel;
s3, deoxidizing and alloying: tapping the molten steel prepared in the S2, and adding 0.30kg of chromium powder and 0.30kg of vanadium powder to prepare deoxidized and alloyed molten steel;
s4, argon blowing refining: refining the deoxidized and alloyed molten steel prepared in the step S3 and blowing argon gas into the molten steel to prepare refined molten steel;
s5, casting molten steel: continuously casting the refined molten steel prepared in the step S4 to prepare a billet;
s6, heating and hot rolling the steel billet: heating the billet obtained in the step S5 at 1150 ℃ to obtain a heated billet, and rolling the heated billet to obtain a rolled billet;
s7, cooling control: and (4) cooling the rolled billet obtained in the step (S6) to obtain the steel for the steel strand.
Example 2
The preparation method of the steel for the steel strand comprises the following steps:
s1, molten iron preparation: 95.70kg of iron powder is melted and molten iron is prepared;
s2, molten iron pretreatment: 38.00kg of the pretreating agent from production example 7 was blown into the molten iron produced in S1 by a blowing method to produce pretreated molten iron;
s3, smelting molten steel: adding 0.10kg of titanium powder, 1.80kg of molybdenum disilicide, 1.20kg of graphite powder and 0.60kg of manganese powder into the pretreated molten iron prepared in the step S2, smelting, and blowing oxygen into the molten iron to prepare molten steel;
s4, deoxidizing and alloying: tapping the molten steel prepared in the S3, and adding 0.30kg of chromium powder and 0.30kg of vanadium powder to prepare deoxidized and alloyed molten steel;
s5, argon blowing refining: refining the deoxidized and alloyed molten steel prepared in the step S4, and blowing argon gas into the molten steel to prepare refined molten steel;
s6, casting molten steel: continuously casting the refined molten steel prepared in the step S5 to prepare a billet;
s7, heating and hot rolling of steel billets: heating the billet obtained in the step S6 at 1150 ℃ to obtain a heated billet, and rolling the heated billet to obtain a rolled billet;
s8, cooling control: and (4) cooling the rolled billet obtained in the step (S7) to obtain the steel for the steel strand.
Examples 3 to 6
Different from the embodiment 2, the raw material proportion of the embodiments 3-6 is different, and the details are shown in the table 2.
TABLE 2 raw material ratios of examples 1-6
Examples 7 to 9
In contrast to example 4, examples 7-9 replaced the molybdenum disilicide with the same amount of the modified molybdenum disilicide from preparations 1-3.
Examples 10 to 14
In contrast to example 8, the pretreatment agents in examples 10-14 were from preparations 8-12, respectively.
Example 15
Unlike example 2, the pretreating agent in example 15 was magnesium particles.
Example 16
Unlike example 2, the pretreatment agent in example 16 was lime powder.
Comparative example
Comparative example 1
Unlike example 1, no molybdenum disilicide was added in comparative example 1.
Comparative example 2
Unlike example 1, comparative example 2 replaces the chromium powder with an equal amount of vanadium powder.
Comparative example 3
Unlike example 1, the vanadium powder was replaced with an equal amount of chromium powder in comparative example 3.
Performance test
The following performance tests were performed on the steels for steel strands obtained in examples 1 to 16 and comparative examples 1 to 3. The performance test includes the tensile strength and the sorbitizing rate of the steel for the steel strand, and the test data are shown in table 3.
1. Tensile strength
The tensile strength of the steel for the steel strand is detected according to the detection standards GB 50017-2017 Steel Structure design Standard (appendix [ separate ]). Detecting the environment: at 25 ℃.
2. Sorbitizing rate
The toughness of the steel for the steel strand is detected according to the detection standard of GB/T13298-2015 Metal microstructure inspection method. Detecting the environment: at 25 ℃.
TABLE 3 Performance test data sheet
The present application is described in detail below with reference to the test data provided in table 3.
Combining examples 1 to 16 and comparative examples 1 to 3, it was found that the steels for steel strands obtained in examples 1 to 14 of the present application were superior to the comparative examples in various properties, indicating that the steels for steel strands obtained in the present application exhibited superior tensile strength and sorbite ratio.
In the combination of examples 1 to 6, it was found that the steel for a strand obtained in example 1 of the present application was lower in both tensile strength and sorbing rate than those of examples 2 to 6 of the present application because the pretreatment agent was not added, which indicates that the pretreatment agent is advantageous in improving the tensile strength and the sorbing rate of the steel for a strand.
In examples 2 to 6, the addition ratios of the steel raw materials for the steel strand were compared. As a result, the steel for a steel strand obtained in example 4 was found to be superior in tensile strength and sorbite ratio, which indicates that the steel for a steel strand in example 4 was superior in the addition ratio of the raw material.
In examples 7 to 9, the influence of the modified molybdenum disilicide was examined by referring to example 4, and as a result, it was found that the steels for steel strands obtained in examples 7 to 9 exhibited better tensile strength and sorbitation rate, which indicates that the modified molybdenum disilicide exhibited better improvement in tensile strength and sorbitation rate of the steels for steel strands.
In examples 7 to 9 of the present application, the influence of the ratio of the modified molybdenum disilicide and the heat preservation time is examined, and as a result, it is found that the steel for steel strands prepared in example 8 is superior in tensile strength and sorbite rate, which indicates that the raw material ratio and the heat preservation time of the modified molybdenum disilicide used in example 8 are advantageous for improving the tensile strength and the sorbite rate of the steel for steel strands.
In comparison with example 8, the present inventors examined the influence of the ratio of magnesium particles to lime powder in examples 10 to 11, and as a result, found that the steel for a strand prepared in example 10 is superior in tensile strength and sorbite ratio, which indicates that the ratio of magnesium particles to lime powder used in example 10 is advantageous in increasing the tensile strength and the sorbite ratio of the steel for a strand.
In example 12 to example 14, the present inventors examined the effect of the pretreatment agent comprising passivated magnesium particles and lime powder, as compared with example 10, and found that the steel for steel strand use obtained in example 12 to example 14 of the present invention is superior in tensile strength and sorbite ratio, which indicates that the pretreatment agent comprising passivated magnesium particles and lime powder is advantageous in increasing the tensile strength and sorbite ratio of the steel for steel strand use.
In examples 12 to 14, the present application examined the influence of the ratio of the passivated magnesium particles to the lime powder, and as a result, it was found that the steel for a steel strand prepared in example 13 performed better in terms of tensile strength and sorbite rate, which indicates that the ratio of the passivated magnesium particles to the lime powder selected in example 13 is advantageous for improving the tensile strength and the sorbite rate of the steel for a steel strand.
By taking the example 2 as a contrast, the examples 15 to 16 examine the influence of the magnesium grains and the lime powder, and as a result, the pretreatment agent in the example 15 is the magnesium grains, and the steel for the steel strand prepared by the pretreatment agent is lower than that in the example 2 in the aspects of tensile strength and sorbitizing rate; in example 16, the pretreatment agent is lime powder, and the tensile strength and the sorbing rate of the steel for the steel strand are lower than those of example 2, which is probably because magnesium particles and the lime powder cooperate with each other, the lime powder removes sulfur and phosphorus elements in molten steel in the process of vaporizing the magnesium particles, magnesium is dispersed, the sulfur elements in the molten steel are removed again after the magnesium particles are vaporized, the influence of harmful elements in the molten steel on the performance of the molten steel is reduced, and thus the tensile strength and the sorbing rate of the steel for the steel strand are improved.
By combining example 1 and comparative example 1, it can be found that the steel for a steel strand prepared in comparative example 1 without adding molybdenum disilicide is lower than that of example 1 in both tensile strength and sorbitizing rate, which indicates that adding molybdenum disilicide to the raw materials is beneficial to improving the tensile strength and the sorbitizing rate of the steel for a steel strand.
By taking the example 1 as a contrast, the chromium powder is replaced by the same amount of vanadium powder in the comparative example 2, and the prepared steel for the steel strand is lower than that in the example 1 in the aspects of tensile strength and sorbite percentage; in the comparative example 3, the vanadium powder was replaced with the same amount of chromium powder, and the tensile strength and the sorbite ratio of the steel for steel strand were lower than those of the steel for steel strand in example 1, which is probably because the vanadium powder and the chromium powder are synergistic with each other, thereby improving the hardenability of the steel for steel strand, suppressing the growth of austenite grains, and improving the strength and toughness of the steel for steel strand.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The steel for the steel strand is characterized by comprising the following raw materials in percentage by weight:
graphite powder: 0.60-1.20%, chromium powder: 0.20-0.30%, vanadium powder: 0.30-0.70%, titanium powder: 0.10-0.30%, molybdenum disilicide: 0.80-1.80%, manganese powder: 0.60-1.00 percent, and the balance being iron powder.
2. The steel for the steel strand as claimed in claim 1, comprising the following raw materials in percentage by weight:
graphite powder: 0.70-1.10%, chromium powder: 0.23-0.27%, vanadium powder: 0.40-0.60%, titanium powder: 0.15-0.25%, molybdenum disilicide: 1.00-1.60%, manganese powder: 0.70-0.90 percent, and the balance of iron powder.
3. The steel for steel strand according to claim 1, characterized in that: the molybdenum disilicide is modified molybdenum disilicide, and the modified molybdenum disilicide is prepared by alloying molybdenum disilicide with aluminum powder.
4. The steel for steel strand according to claim 3, characterized in that: the modified molybdenum disilicide consists of aluminum powder and molybdenum disilicide according to the weight ratio (0.5-1.5): (1.5-2.5), and the modified molybdenum disilicide is prepared by the following steps:
a1, mixing and grinding molybdenum disilicide and aluminum powder to obtain mixed powder;
a2, carrying out heat treatment on the mixed powder prepared from A1 under the protection of hydrogen to prepare the treated mixed powder;
a3, grinding the treated mixed powder prepared from A2 under the protection of argon, and carrying out cold isostatic pressing treatment to prepare treated powder;
a4, sintering the treated powder prepared by the A3 to prepare the modified molybdenum disilicide.
5. The steel for steel strand according to claim 4, wherein: in the step A2, the heat treatment step is as follows: heating the mixed powder prepared in the step A1 to 900-1100 ℃ and preserving the heat for 20-40 min.
6. The method for manufacturing steel for steel strand as claimed in any one of claims 1 to 5, comprising the steps of:
s1, molten iron preparation: melting iron powder and preparing molten iron;
s2, smelting molten steel: adding titanium powder, molybdenum disilicide, graphite powder and manganese powder into the molten iron prepared in the step S1 for smelting, and blowing oxygen into the molten iron to prepare molten steel;
s3, deoxidizing and alloying: tapping the molten steel prepared in the S2, and adding chromium powder and vanadium powder to prepare deoxidized and alloyed molten steel;
s4, argon blowing refining: refining the deoxidized and alloyed molten steel prepared in the step S3, and blowing argon gas into the molten steel to prepare refined molten steel;
s5, casting molten steel: continuously casting the refined molten steel prepared in the step S4 to prepare a billet;
s6, heating and hot rolling of steel billets: heating the billet prepared in the step S5 at 1100-1200 ℃ to prepare a heated billet, and rolling the heated billet to prepare a rolled billet;
s7, cooling control: and (4) cooling the rolled billet obtained in the step (S6) to obtain the steel for the steel strand.
7. The method for producing a steel for a steel strand as set forth in claim 6, wherein: the molten iron in the step S1 is pretreated molten iron prepared by blowing 34-38% of a pretreatment agent by a blowing method, the pretreatment agent is prepared by adding lime powder into magnesium particles, and the weight ratio of the magnesium particles to the lime powder is (1-3): (0.5-1.5).
8. The method for producing a steel for a steel strand as set forth in claim 7, wherein: the magnesium grains are passivated magnesium grains, and the passivated magnesium grains are prepared by the following steps:
and (3) immersing the magnesium grains into 8-10g/L hydrofluoric acid, taking out after immersing for 20-40s, cleaning and drying to obtain the passivated magnesium grains.
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