CN106544594B - Carbon vanadium steel and preparation method thereof during a kind of drill steel is used - Google Patents

Carbon vanadium steel and preparation method thereof during a kind of drill steel is used Download PDF

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Publication number
CN106544594B
CN106544594B CN201610964627.8A CN201610964627A CN106544594B CN 106544594 B CN106544594 B CN 106544594B CN 201610964627 A CN201610964627 A CN 201610964627A CN 106544594 B CN106544594 B CN 106544594B
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steel
temperature
drill
during
carbon vanadium
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CN106544594A (en
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袁淑君
戈文英
梁娜
郑桂芸
欧阳峥容
张海霞
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Shandong Iron and Steel Group Co Ltd SISG
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Shandong Iron and Steel Group Co Ltd SISG
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • 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
    • C21C7/068—Decarburising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C22C38/06—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten

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  • 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 present invention provides carbon vanadium steel and preparation method thereof during a kind of drill steel is used, and the steel alloy includes following components by weight percentage：C, 0.33 0.38%；Si, 0.17 0.37%；Mn, 0.50 0.70%；Cr, 1.00 1.20%；P ,≤0.025%；S ,≤0.020%；Mo, 0.20 0.30%；V, 0.10 0.15%；Al, 0.015 0.060%；O ,≤0.0015%.Surplus is Fe and inevitable impurity.Round steel is made using electric furnace smelting, LF refining, VD Fruit storages, overall Tundish Connection cast strand, hot sending rolling in the preparation method of the present invention.Carbon vanadium steel has preferable processing characteristics, good quenching degree, wearability and higher creep rupture strength in being used using drill steel produced by the present invention, and has certain corrosion resistance.

Description

Carbon vanadium steel and preparation method thereof during a kind of drill steel is used
Technical field
The invention belongs to structural alloy steel technical field, and in particular to carbon vanadium steel and its preparation during a kind of drill steel is used Method.
Background technology
The elongated system of bars that drilling tool is made up of parts such as bore bit, drill steel, bit shanks, is mining activities, the energy It is used for the main work of Drilling rock in the field projects under construction such as construction, traffic construction, hydroelectric project construction, Urbanization Construction Tool.Drill steel will afford axial tension stress, distorting stress and curved as a kind of component for transmitting rock drill ballistic work in work Three kinds of stress interactions of transverse stress, easily produce fatigue fracture；And in drilling process, high temperature can be produced, it can more aggravate Deteriorate the working environment of drill steel；According to the difference of the condition such as load and rock solidity, the service life of drill steel generally just has More than ten minutes to tens hours；Average tunnelling footage is 50-250 rice.
Therefore, excellent drill steel material is researched and developed, improves the quenching degree, wearability and creep rupture strength of material, from And improve drilling tool properties of product, the service life of drilling tool product is improved, to whole drilling tool the industry even hair of economic construction of China Exhibition is vital.
The content of the invention
The purpose of the present invention is to overcome above-mentioned prior art medium alloy steel quenching degree, wearability and creep rupture strength poor, The problem of drill steel service life is short etc., propose a kind of drill steel use in carbon vanadium steel and preparation method thereof；Program pin It is matrix by using medium carbon steel to drill steel service condition and performance requirement, adds a certain amount of Mn, Cr, Mo, V, Al element Composition design theory, production technology is rationally designed, ensure material high-cleanness, high and composition high uniformity, there is material preferable Processing characteristics (heat treatment performance), good quenching degree, wearability and higher creep rupture strength, and have certain anti- Corrosive nature, improve the service life of material.
In order to solve the above problems, the present invention provides following technical scheme：
Carbon vanadium steel during a kind of drill steel is used, the steel alloy include following components by weight percentage：C, 0.33-0.38%；Si, 0.17-0.37%；Mn, 0.50-0.70%；Cr, 1.00-1.20%；P ,≤0.025%；S ,≤ 0.020%；Mo, 0.20-0.30%；V, 0.10-0.15%；Al, 0.015-0.060%；O ,≤0.0015%；Surplus be Fe and Inevitable impurity.
In order to consider the requirement of material processing characteristics, quenching degree, wearability, creep rupture strength, will be described below In the present invention the reasons why chemical composition limited amount：
C is most basic intensified element in steel, can improve intensity, but C increases influence the weldability and toughness of steel.In order that steel Yield strength reach more than 950MPa, C need to be more than 0.32%.The present invention uses medium carbon steel as matrix, and C content control exists When 0.33-0.38%, C ＜ 0.33%, the hardenability of material is relatively low, makes the drill steel hardness after quenching insufficient, by rock in work Impact is easily deformed, and C ＞ 0.38% can then improve the hardenability of material, raises the drill steel hardness after heat treatment, although by rock Stone impact is unlikely to deform, but easily occurs stress cracking after quenching, and produces heat treatment waste product；It is preferably controlled in 0.34-0.36%.
Si is conventional deoxidier, while plays solution strengthening effect, can improve intensity；Separately it can also strengthen under field conditions (factors) Decay resistance；In order to improve intensity and increase the corrosion resistance of steel, Si amounts are needed more than 0.16%, but cross high Si content Can drastically reduce steel toughness.The control of Si contents be able to not can then be played de- in 0.17-0.37%, Si ＜ 0.17% in the present invention Oxygen, the effect for improving intensity, Si ＞ 0.37% can then reduce the toughness of steel；It is preferably controlled in 0.20-0.30%.
Mn is solution strengthening element, can improve intensity and toughness.The control of Mn contents is in 0.50-0.70%, guarantor in the present invention The processing characteristics and intensity of steel are demonstrate,proved, Mn ＜ 0.50% are then difficult to ensure that the strength of materials of drill steel, meanwhile, Si in molten steel can be High-melting-point silicate is generated in the environment of low Mn, fluidity molten steel is reduced, causes inclusion content in melting steel to be not easy to remove, reduces steel Degree of purity；Mn ＞ 0.70% can then cause cost to waste；It is preferably controlled in 0.60-0.70%.
Cr is strong hardenability element, can significantly improve the quenching degree and wearability of steel, in the present invention control of Cr contents exist 1.00-1.20%, Cr ＜ 1.00% can then be difficult to ensure that the quenching degree and wearability of steel, and Cr ＞ 1.20% can then cause cost Waste；It is preferably controlled in 1.10-1.20%；
P is unfavorable to welding, and has cold brittleness, belongs to harmful element in steel, and P content is controlled≤0.025%, is preferably controlled System is ≤0.015%.
S is harmful impurity element in steel, easily causes hot-short, causes cracking during hot rolling or forms internal split Line and can not use, the present invention in S content≤0.020%, be preferably controlled in≤0.010%.
Mo can improve the heat resistance and creep strength of steel, ensure that drill steel keeps enough intensity and anti-compacted at high operating temperatures Change ability, meanwhile, Mo is combined with Cr is greatly improved quenching degree, crystal grain thinning, raising toughness, and Mo contents, which control, in the present invention exists 0.2-0.30%, Mo ＜ 0.2% then can not be good suppression temper brittleness, be also not sufficient to ensure that elevated temperature strength and creep resistance Energy；Mo ＞ 0.30% can then dramatically increase material cost, cause cost to waste；It is preferably controlled in 0.22-0.26%.
V can improve the creep rupture strength of steel, at the same the vanadium carbides that are combined with C of V be it is most hard most wear-resisting in metal carbides, can To significantly improve the service life of drill steel, in the present invention V content control then strengthen effect not in 0.10-0.15%, V ＜ 0.10% Foot, V ＞ 0.15% can then generate larger vanadium carbide particulate inclusion, not only without invigoration effect, it is tough to significantly reduce material on the contrary Property；It is preferably controlled in 0.12-0.15%.
Al is deoxidation essential element, while the nomadic nitrogen in fixed steel, while can play crystal grain thinning and invigoration effect, Because Al has Grain refinement, crystal grain thinning can improve hardness of steel and toughness.The Al content of the present invention is selected in 0.015- 0.060%, Al ＜ 0.015% can not then eliminate the nitrogen to dissociate in steel, and Al ＞ 0.060% can then reduce fluidity molten steel, molten steel Easily cause set eye accident in casting process, be preferably controlled in 0.025-0.050%.
O is pernicious gas element, and too high oxygen level can directly make the increase of steel inner oxide field trash, influence the cleaning of steel Degree, so as to cause the intensity of steel, toughness to reduce, wearability, high temperature creep strength on steel influence serious.O content in the present invention ≤ 0.0015%, it is preferably controlled in≤0.0012%.
Preferably, in above-mentioned drill steel use in carbon vanadium steel, under the steel alloy is included by weight percentage State component：C, 0.34-0.36%；Si, 0.20-0.30%；Mn, 0.60-0.70%；Cr, 1.10-1.20%；P ,≤ 0.015%；S ,≤0.010%；Mo, 0.22-0.26%；V, 0.12-0.15%；Al, 0.025-0.050%；O ,≤ 0.0012%；Surplus is Fe and inevitable impurity.
The preparation method of carbon vanadium steel, the preparation method comprise the following steps during a kind of above-mentioned drill steel is used：
1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomanganese, Gao Meng, Gao Ge, The alloys such as molybdenum-iron carry out ladle alloying；
Foamed slag has been made in electric furnace smelting process, uniform decarburization, has reduced and inhales nitrogen, control electric furnace steel tapping terminal C >=0.10%, P≤0.010%, residual element content meet the requirements, the control of the tapping temperature of molten steel 1620-1660 DEG C (such as：1625℃、 1632℃、1645℃、1650℃、1657℃)；In tapping process with steel stream add steel-core-aluminium 1.5-2.5kg/t steel (such as： 1.7kg/t steel, 1.9kg/t steel, 2.2kg/t steel, 2.4kg/t steel), slag material (slag material be steel industry commonly use slag making Material, such as CaO, Al2O3、SiO2Deng) 10-15kg/t steel (such as：11kg/t steel, 12kg/t steel, 13kg/t steel, 14kg/t Steel)；
2) LF stoves refine：Molten steel in step 1) by electric furnace smelting is subjected to LF stove refinings；Whole process is made in refining process White slag, white slag retention time >=25 minute (such as：28 minutes, 30 minutes, 32 minutes, 35 minutes, 40 minutes), control refining slag Basicity be 3.0-3.3 (such as：3.12nd, 3.19,3.24,3.28), feeding Al line 1.0-3.0m/t steel (such as：1.2m/t steel, 1.5m/t steel, 2.0m/t steel, 2.6m/t steel, 2.8m/t steel), ensure molten steel Al >=0.030%, reach reduction dissolved oxygen content, Strengthen the effect of desulfurized effect；And the alloys such as ferrosilicon, Gao Meng, Gao Ge, molybdenum-iron, vanadium iron are added into stove, make Si, Mn, Cr, Mo, V Content in the claimed range of component ratio；Before the tapping of LF stoves refined molten steel, feeding calcium line 1.0-2.5m/t steel (such as： 1.2m/t steel, 1.5m/t steel, 2.0m/t steel, 2.2m/t steel, 2.4m/t steel), deformation processing of inclusion is carried out, reduces bulky grain folder Debris；
3) VD vacuum outgas：Ladle after LF stoves refining in step 2) is carried out taking off Slag treatment, then carried out at VD vacuum Reason, vacuum be less than 67Pa, the retention time be >=15 minutes (such as：16th, 18 minutes, 19 minutes, 20 minutes, 22 minutes)；It is broken Process hydrogen is measured after sky, hydrogen content no more than 2.0ppm (such as：0.8ppm、0.9ppm、1.2ppm、1.3ppm、 1.6ppm、1.8ppm)；Carry out soft blow argon again, soft argon blowing time be >=15 minutes (such as：15 minutes, 17 minutes, 18 minutes, 20 Minute, 25 minutes)；
4) continuous casting：Ladle liquid through VD Fruit storages in step 3) is stirred using monoblock type tundish, crystallizer electromagnetism The mode for mixing and stirring end electromagnetic agitation is poured into a mould；Using monoblock type tundish, reach more preferable molding casting effect；In continuous casting Using M-EMS and end electromagnetic agitation, to mitigate component segregation, steel uniformity is improved；
Cast is using " constant level, stationary temperature, permanent pulling rate " three permanent operation：
Using 15-25 DEG C (such as：16 DEG C, 18 DEG C, 21 DEG C, 23 DEG C) Prepared by Low Superheat Pouring technology, molten steel temperature in tundish For 1517-1527 DEG C (such as：1519℃、1521℃、1522℃、1526℃)；Ladle is controlled to tundish using metering nozzle Molten steel flow, the molten steel amount of stable tundish is constant so as to reach pouring basket liquid level, using stopper control molten steel flow, ensures Control liquid level fluctuation of crystallizer≤± 3mm；For 180 × 220mm2Continuous casting billet, it is 0.95-1.10m/min (examples to control pulling rate Such as：0.96m/min, 0.98m/min, 1.00m/min), for 260 × 300mm2Continuous casting billet, it is 0.50-0.60m/ to control pulling rate Min (such as：0.54m/min、0.56m/min、0.59m/min)；
Strand enters withdrawal straightening machine and aligned, straightening temperature be 900-980 DEG C (such as：910℃、925℃、940℃、965 ℃)；
5) hot rolling：To reduce energy consumption, the strand of the continuous casting forming in step 4) is rolled using hot delivering technology of CC billets technique System production；Wherein, control parameter during rolling is：Hot delivering technology of CC billets temperature >=500 DEG C (such as：505℃、510℃、525℃、 550 DEG C, 580 DEG C, 650 DEG C, 700 DEG C), 1180-1220 DEG C of control heating furnace soaking zone temperature (such as：1185℃、1190℃、 1200 DEG C, 1215 DEG C), for 180 × 220mm2The heat time of continuous casting billet be 2.0-2.5h (such as：2.1h、2.2h、2.3h、 2.5h), for 260 × 300mm2The heat time of continuous casting billet be 2.5-3.0h (such as：2.6h, 2.7h, 2.8h, 3.0h), open Roll 1100-1180 DEG C of temperature (such as：1120 DEG C, 1140 DEG C, 1165 DEG C, 1175 DEG C), 850-950 DEG C of finishing temperature (such as： 865℃、885℃、920℃、940℃)；
6) cool down：Steel after being rolled in step 5) are carried out with wind sheltering stacking slow cooling to room temperature, obtains carbon during the drill steel is used Vanadium steel.
Preferably, during above-mentioned drill steel is used in carbon vanadium steel preparation method, the matter of the molten iron added in step 1) Percentage (i.e. the quality of molten iron and the ratio between molten iron and steel scrap gross mass) >=60% is measured, to reduce power consumption；Preferably, the molten iron Mass percent be 68.8-72.5%.
Preferably, during above-mentioned drill steel is used in carbon vanadium steel preparation method, the C of electric furnace steel tapping terminal described in step 1) is 0.13-0.16%, P 0.008-0.010%, residual element content meet design requirement, and the tapping temperature of molten steel is 1630- 1650 DEG C (such as：1635℃、1639℃、1646℃、1649℃)；The steel-core-aluminium 2.0- added in tapping process with steel stream 2.5kg/t steel (such as：2.1kg/t steel, 2.2kg/t steel, 2.3kg/t steel, 2.4kg/t steel), slag material 11-14kg/t steel (examples Such as：12kg/t steel, 12.5kg/t steel, 13kg/t steel, 13.5kg/t steel).
Preferably, during above-mentioned drill steel is used in carbon vanadium steel preparation method, the steel scrap added in step 1) is high-quality useless Steel, do not allow to add high phosphorus, high-sulfur steel scrap.
Preferably, predetermined component lower limit is pressed during above-mentioned drill steel is used in carbon vanadium steel preparation method, in step 1) to institute State and the alloys such as silicomanganese, Gao Meng, Gao Ge, molybdenum-iron progress ladle alloying is added in electric furnace, make Si controls in 0.12-0.20%, Mn Control is in 0.50-0.60%, and Cr controls are in 0.90-1.10%, and Mo controls are in 0.18-0.22%, to mitigate refining procedure alloy Add pressure.
Preferably, during above-mentioned drill steel is used in carbon vanadium steel preparation method, the raw material such as alloy added in step 1) Toasted, baking time is 1-2 hours (such as 1.2h, 1.5h, 1.8h), temperature be 200-400 DEG C (such as 210 DEG C, 230 DEG C, 250 DEG C, 300 DEG C, 350 DEG C, 370 DEG C, 390 DEG C), to reduce the substitution of the gas contents such as nitrogen, hydrogen.
Preferably, during above-mentioned drill steel is used in carbon vanadium steel preparation method, white slag is protected in the step 2) refining process Hold the time for 28-35 minutes (such as：29 minutes, 30 minutes, 31 minutes, 33 minutes, 34 minutes), refining basicity of slag is 3.1- 3.3 (such as：3.12nd, 3.20,3.24,3.28), feeding Al line 2.0-2.8m/t steel (such as：2.2m/t steel, 2.4m/t steel, 2.7m/t steel), molten steel Al is 0.035-0.045%, preferably reaches reduction dissolved oxygen content, strengthens the purpose of desulfurized effect.
Preferably, during above-mentioned drill steel is used in carbon vanadium steel preparation method, in step 3), the guarantor of the VD applications of vacuum Hold the time for 18-25 minutes (such as：19 minutes, 20 minutes, 22 minutes, 24 minutes)；Process hydrogen after broken sky is to use to determine hydrogen Instrument is measured, hydrogen content be no more than 1.5ppm (such as：0.8ppm、0.9ppm、1.1ppm、1.2ppm、1.4ppm)；Soft blow argon Time be 20-30 minutes (such as：22 minutes, 24 minutes, 26 minutes, 29 minutes).
Preferably, during above-mentioned drill steel is used in carbon vanadium steel preparation method, using VD duplex bit manipulations, to properly increase LF external refinings, VD vacuum processing times, so as to have the function that preferably to remove gas, field trash.
Preferably, during above-mentioned drill steel is used in carbon vanadium steel preparation method, in step 4), the degree of superheat is 15-22 DEG C, institute Molten steel temperature in tundish is stated as 1517-1524 DEG C；Strand enters withdrawal straightening machine temperature for 920-970 DEG C.
Preferably, during above-mentioned drill steel is used in carbon vanadium steel preparation method, in step 5), the hot delivering technology of CC billets temperature For 520-550 DEG C (such as：525 DEG C, 530 DEG C, 540 DEG C, 545 DEG C), 1200-1220 DEG C of (example of the heating furnace soaking zone temperature Such as：1205 DEG C, 1210 DEG C, 1215 DEG C, 1218 DEG C), 1130-1170 DEG C of the start rolling temperature (such as：1135℃、1145℃、 1155 DEG C, 1166 DEG C), 920-940 DEG C of the finishing temperature (such as：925℃、930℃、935℃、938℃).
The processing step, technological parameter and the condition that limit is not added to can refer to the conventional skill of this area in above-mentioned preparation method Art.
Compared with immediate prior art, technical scheme provided by the invention has following excellent effect：
1st, technical scheme provided by the invention uses medium carbon steel as matrix by rational composition design, addition Mn, Cr, Mo, V, Al are multi-element alloyed, material is had preferable processing characteristics, quenching degree, wearability, creep rupture strength.The present invention The steel alloy tensile strength prepared is more than 1080MPa, yield strength is more than 940MPa, and elongation percentage is more than 11%, section shrinkage Rate is more than 50%, ballistic work and is more than 125J, and quenching degree is good, higher in 550 DEG C of high temperature strength ranks；The middle carbon of the present invention contains vanadium The drill steel that steel alloy is processed into, average tunnelling footage are 300-600 rice, the more significant service life for improving drill steel.
2nd, preparation method of the invention ensures that the cleanliness factor of material and composition are uniform by rational process design Property, make steel that there is excellent heat treatment performance and high temperature and creep resistance intensity, so as to improve the service life of material.The present invention carries The preparation method of confession is simple, and technique is excellent, with short production cycle, can wide popularization and application.
3rd, the present invention can realize continuous production industrially, easy to operation, practical, cost-effective, reduce work Intensity；Preparation technology of the present invention and required equipment are simple；The present invention is using conventional smelting and steel rolling equipment, and hot rolling technology is simple Feasible, current most of industrial production line can be produced in existing equipment.
4th, the steel alloy finished product prepared using material composition provided by the invention, crystallite dimension more refines, performance indications It is moderately good, the mixed crystal phenomenon of structural alloy steel is essentially eliminated, improves high-temperature behavior, qualification rate is high.
Embodiment
Technical scheme is clearly and completely described below in conjunction with embodiment, it is clear that described reality Apply the part of the embodiment that example is only the present invention, rather than whole embodiments.Based on the embodiment in the present invention, this area The every other embodiment that those of ordinary skill is obtained, belongs to the scope of protection of the invention.
Embodiments of the invention are smelted using UHP uhp electric arc furnaces, LF stoves refine, VD vacuum degassing treatment tech smeltings Refining, continuous casting strand, roll technique productions steel of becoming a useful person.Embodiments of the invention are with the production work of Φ 35mm specification steel Skill come illustrate the present invention how to implement.
Embodiment 1
The preparation method of carbon vanadium steel comprises the following steps during a kind of drill steel is used：
1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomanganese, Gao Meng, Gao Ge, The alloys such as molybdenum-iron carry out ladle alloying, molten iron proportion 68.8%；The steel scrap of addition is high-quality steel scrap, and the alloy of addition is equal Toasted, to reduce the substitution of the gas contents such as nitrogen, hydrogen；
Foamed slag has been made in electric furnace smelting process, uniform decarburization, is reduced and is inhaled nitrogen, control electric furnace steel tapping terminal C be 0.13%, P is 0.008%, and residual element content meets design requirement, and the tapping temperature of molten steel is controlled at 1630 DEG C；With steel in tapping process Stream addition steel-core-aluminium 2.0kg/t steel, slag material 13kg/t steel；
2) LF stoves refine：LF stove refinings are carried out by the molten steel of electric furnace smelting；Whole process makes white slag in refining process, and white slag is protected Hold the time 28 minutes, control refining basicity of slag 3.3, feed Al line 2.0m/t steel, and ferrosilicon, Gao Meng, Gao Ge, molybdenum are added into stove The alloys such as iron, vanadium iron, make Si, Mn, Cr, Mo, V content in the claimed range of component ratio, Al 0.040%；LF stoves essence Before making steel water tapping, calcium line 1.8m/t steel is fed, carries out deformation processing of inclusion, reduces large inclusionses；
3) VD vacuum outgas：Ladle after LF stoves are refined carries out taking off Slag treatment, then carries out VD applications of vacuum, vacuum It it is 20 minutes less than 67Pa, retention time；The measure of process hydrogen, hydrogen content 1.0ppm are carried out after broken sky using hydrogen determinator；Again Soft blow argon is carried out, soft argon blowing time is 25 minutes；Simultaneously to properly increase LF external refinings, VD vacuum processing times, using VD Duplexing bit manipulation, so as to have the function that preferably to remove gas, field trash；
4) continuous casting：Monoblock type tundish is used by the ladle liquid of VD Fruit storages, reaches more preferable molding casting Effect；M-EMS and end electromagnetic agitation are used in continuous casting, to mitigate component segregation, improves steel uniformity；In Between Baogang's coolant-temperature gage be 1524 DEG C；The degree of superheat is 22 DEG C, is 180 × 220mm2Base type, it is 0.95m/min to control pulling rate；Strand Enter withdrawal straightening machine temperature for 920 DEG C；
5) hot rolling：The strand of continuous casting forming carries out Rolling Production using hot delivering technology of CC billets technique；Wherein, control during rolling Parameter is：520 DEG C of hot delivering technology of CC billets temperature, 1220 DEG C, heat time 2.5h of control heating furnace soaking zone temperature, start rolling temperature 1170 DEG C, 940 DEG C of finishing temperature；
6) cool down：Steel after rolling are carried out with wind sheltering stacking slow cooling to room temperature, obtains middle carbon vanadium-containing alloy hot rolled circular steel.
Embodiment 2
The preparation method of carbon vanadium steel comprises the following steps during a kind of drill steel is used：
1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomanganese, Gao Meng, Gao Ge, The alloys such as molybdenum-iron carry out ladle alloying, and molten iron proportion is 71%；The steel scrap of addition is high-quality steel scrap, and the alloy of addition is equal Toasted, to reduce the substitution of the gas contents such as nitrogen, hydrogen；
Foamed slag has been made in electric furnace smelting process, uniform decarburization, is reduced and is inhaled nitrogen, control electric furnace steel tapping terminal C be 0.15%, P is 0.007%, and residual element content meets design requirement, and the tapping temperature of molten steel is controlled at 1650 DEG C；With steel in tapping process Stream addition steel-core-aluminium 2.2kg/t steel, slag material 11kg/t steel；
2) LF stoves refine：LF stove refinings are carried out by the molten steel of electric furnace smelting；Whole process makes white slag in refining process, and white slag is protected Hold the time 30 minutes, control refining basicity of slag 3.0, feed Al line 2.5m/t steel, and ferrosilicon, Gao Meng, Gao Ge, molybdenum are added into stove The alloys such as iron, vanadium iron, make Si, Mn, Cr, Mo, V content in the claimed range of component ratio, Al 0.048%；LF stoves essence Before making steel water tapping, calcium line 1.5m/t steel is fed, carries out deformation processing of inclusion, reduces large inclusionses；
3) VD vacuum outgas：Ladle after LF stoves are refined carries out taking off Slag treatment, then carries out VD applications of vacuum, vacuum It it is 22 minutes less than 67Pa, retention time；The measure of process hydrogen, hydrogen content 1.2ppm are carried out after broken sky using hydrogen determinator；Again Soft blow argon is carried out, soft argon blowing time is 20 minutes；Simultaneously to properly increase LF external refinings, VD vacuum processing times, using VD Duplexing bit manipulation, so as to have the function that preferably to remove gas, field trash；
4) continuous casting：Monoblock type tundish is used by the ladle liquid of VD Fruit storages, reaches more preferable molding casting Effect；M-EMS and end electromagnetic agitation are used in continuous casting, to mitigate component segregation, improves steel uniformity；In Between Baogang's coolant-temperature gage be 1520 DEG C, the degree of superheat be 18 DEG C, be 180 × 220mm2Base type, it is 0.97m/min to control pulling rate；Strand Enter withdrawal straightening machine temperature for 950 DEG C；
5) hot rolling：The strand of continuous casting forming carries out Rolling Production using hot delivering technology of CC billets technique；Wherein, control during rolling Parameter is：550 DEG C of hot delivering technology of CC billets temperature, 1215 DEG C, heat time 2.4h of control heating furnace soaking zone temperature, start rolling temperature 1150 DEG C, 935 DEG C of finishing temperature；
6) cool down：Steel after rolling are carried out with wind sheltering stacking slow cooling to room temperature, obtains middle carbon vanadium-containing alloy hot rolled circular steel.
Embodiment 3
The preparation method of carbon vanadium steel comprises the following steps during a kind of drill steel is used：
1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomanganese, Gao Meng, Gao Ge, The alloys such as molybdenum-iron carry out ladle alloying, molten iron proportion 70%；The steel scrap of addition is high-quality steel scrap, and the alloy of addition enters Row baking, to reduce the substitution of the gas contents such as nitrogen, hydrogen；
Foamed slag has been made in electric furnace smelting process, uniform decarburization, is reduced and is inhaled nitrogen, control electric furnace steel tapping terminal C be 0.16%, P is 0.007%, and residual element content meets design requirement, and the tapping temperature of molten steel is controlled at 1635 DEG C；With steel in tapping process Stream addition steel-core-aluminium 2.2kg/t steel, slag material 14kg/t steel；
2) LF stoves refine：LF stove refinings are carried out by the molten steel of electric furnace smelting；Whole process makes white slag in refining process, and white slag is protected Hold the time 35 minutes, control refining basicity of slag 3.2, feed Al line 2.2m/t steel, and ferrosilicon, Gao Meng, Gao Ge, molybdenum are added into stove The alloys such as iron, vanadium iron, make Si, Mn, Cr, Mo, V content in the claimed range of component ratio, Al 0.043%；LF stoves essence Before making steel water tapping, calcium line 2.3m/t steel is fed, carries out deformation processing of inclusion, reduces large inclusionses；
3) VD vacuum outgas：Ladle after LF stoves are refined carries out taking off Slag treatment, then carries out VD applications of vacuum, vacuum It it is 17 minutes less than 67Pa, retention time；The measure of process hydrogen, hydrogen content 1.1ppm are carried out after broken sky using hydrogen determinator；Again Soft blow argon is carried out, soft argon blowing time is 28 minutes；Simultaneously to properly increase LF external refinings, VD vacuum processing times, using VD Duplexing bit manipulation, so as to have the function that preferably to remove gas, field trash；
4) continuous casting：Monoblock type tundish is used by the ladle liquid of VD Fruit storages, reaches more preferable molding casting Effect；M-EMS and end electromagnetic agitation are used in continuous casting, to mitigate component segregation, improves steel uniformity；In Between Baogang's coolant-temperature gage be 1517 DEG C, the degree of superheat be 15 DEG C；For 180 × 220mm2Base type, it is 1.00m/min to control pulling rate；Strand Enter withdrawal straightening machine temperature for 920 DEG C；
5) hot rolling：The strand of continuous casting forming carries out Rolling Production using hot delivering technology of CC billets technique；Wherein, control during rolling Parameter is：535 DEG C of hot delivering technology of CC billets temperature, 1200 DEG C, heat time 2.2h of control heating furnace soaking zone temperature, start rolling temperature 1136 DEG C, 920 DEG C of finishing temperature；
6) cool down：Steel after rolling are carried out with wind sheltering stacking slow cooling to room temperature, obtains middle carbon vanadium-containing alloy hot rolled circular steel.
Embodiment 4
The preparation method of carbon vanadium steel comprises the following steps during a kind of drill steel is used：
1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomanganese, Gao Meng, Gao Ge, The alloys such as molybdenum-iron carry out ladle alloying, molten iron proportion 72.5%；The steel scrap of addition is high-quality steel scrap, and the alloy of addition is equal Toasted, to reduce the substitution of the gas contents such as nitrogen, hydrogen；
Foamed slag has been made in electric furnace smelting process, uniform decarburization, is reduced and is inhaled nitrogen, control electric furnace steel tapping terminal C be 0.14%, P is 0.006%, and residual element content meets design requirement, and the tapping temperature of molten steel is controlled at 1640 DEG C；With steel in tapping process Stream addition steel-core-aluminium 2.0kg/t steel, slag material 12kg/t steel；
2) LF stoves refine：LF stove refinings are carried out by the molten steel of electric furnace smelting；Whole process makes white slag in refining process, and white slag is protected Hold the time 32 minutes, control refining basicity of slag 3.1, feed Al line 1.2m/t steel, and ferrosilicon, Gao Meng, Gao Ge, molybdenum are added into stove The alloys such as iron, vanadium iron, make Si, Mn, Cr, Mo, V content in the claimed range of component ratio, Al 0.030%；LF stoves essence Before making steel water tapping, calcium line 2.0m/t steel is fed, carries out deformation processing of inclusion, reduces large inclusionses；
3) VD vacuum outgas：Ladle after LF stoves are refined carries out taking off Slag treatment, then carries out VD applications of vacuum, vacuum It it is 18 minutes less than 67Pa, retention time；The measure of process hydrogen, hydrogen content 1.6ppm are carried out after broken sky using hydrogen determinator；Again Soft blow argon is carried out, soft argon blowing time is 30 minutes；Simultaneously to properly increase LF external refinings, VD vacuum processing times, using VD Duplexing bit manipulation, so as to have the function that preferably to remove gas, field trash；
4) continuous casting：Monoblock type tundish is used by the ladle liquid of VD Fruit storages, reaches more preferable molding casting Effect；M-EMS and end electromagnetic agitation are used in continuous casting, to mitigate component segregation, improves steel uniformity；In Between Baogang's coolant-temperature gage be 1519 DEG C, the degree of superheat be 17 DEG C；For 180 × 220mm2Base type, it is 0.98m/min to control pulling rate；Strand Enter withdrawal straightening machine temperature for 970 DEG C；
5) hot rolling：The strand of continuous casting forming carries out Rolling Production using hot delivering technology of CC billets technique；Wherein, control during rolling Parameter is：540 DEG C of hot delivering technology of CC billets temperature, 1210 DEG C, heat time 2.3h of control heating furnace soaking zone temperature, start rolling temperature 1130 DEG C, 925 DEG C of finishing temperature；
6) cool down：Steel after rolling are carried out with wind sheltering stacking slow cooling to room temperature, obtains middle carbon vanadium-containing alloy hot rolled circular steel.
Embodiment 5
The preparation method of carbon vanadium steel comprises the following steps during a kind of drill steel is used：
1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomanganese, Gao Meng, Gao Ge, The alloys such as molybdenum-iron carry out ladle alloying, molten iron proportion 71.5%；The steel scrap of addition is high-quality steel scrap, and the alloy of addition is equal Toasted, to reduce the substitution of the gas contents such as nitrogen, hydrogen；
Foamed slag has been made in electric furnace smelting process, uniform decarburization, is reduced and is inhaled nitrogen, control electric furnace steel tapping terminal C be 0.17%, P is 0.010%, and residual element content meets design requirement, and the tapping temperature of molten steel is controlled at 1660 DEG C；With steel in tapping process Stream addition steel-core-aluminium 2.5kg/t steel, slag material 12kg/t steel；
2) LF stoves refine：LF stove refinings are carried out by the molten steel of electric furnace smelting；Whole process makes white slag in refining process, and white slag is protected Hold the time 38 minutes, control refining basicity of slag 3.0, feed Al line 1.5m/t steel, and ferrosilicon, Gao Meng, Gao Ge, molybdenum are added into stove The alloys such as iron, vanadium iron, make Si, Mn, Cr, Mo, V content in the claimed range of component ratio, Al 0.040%；LF stoves essence Before making steel water tapping, calcium line 1.2m/t steel is fed, carries out deformation processing of inclusion, reduces large inclusionses；
3) VD vacuum outgas：Ladle after LF stoves are refined carries out taking off Slag treatment, then carries out VD applications of vacuum, vacuum It it is 21 minutes less than 67Pa, retention time；The measure of process hydrogen, hydrogen content 1.0ppm are carried out after broken sky using hydrogen determinator；Again Soft blow argon is carried out, soft argon blowing time is 20 minutes；Simultaneously to properly increase LF external refinings, VD vacuum processing times, using VD Duplexing bit manipulation, so as to have the function that preferably to remove gas, field trash；
4) continuous casting：Monoblock type tundish is used by the ladle liquid of VD Fruit storages, reaches more preferable molding casting Effect；M-EMS and end electromagnetic agitation are used in continuous casting, to mitigate component segregation, improves steel uniformity；In Between Baogang's coolant-temperature gage be 1525 DEG C, the degree of superheat be 23 DEG C；For 180 × 220mm2Base type, it is 0.95m/min to control pulling rate；Strand Enter withdrawal straightening machine temperature for 900 DEG C；
5) hot rolling：The strand of continuous casting forming carries out Rolling Production using hot delivering technology of CC billets technique；Wherein, control during rolling Parameter is：520 DEG C of hot delivering technology of CC billets temperature, 1180 DEG C, heat time 2.5h of control heating furnace soaking zone temperature, start rolling temperature 1100 DEG C, 950 DEG C of finishing temperature；
6) cool down：Steel after rolling are carried out with wind sheltering stacking slow cooling to room temperature, obtains middle carbon vanadium-containing alloy hot rolled circular steel.
Embodiment 6
The preparation method of carbon vanadium steel comprises the following steps during a kind of drill steel is used：
1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomanganese, Gao Meng, Gao Ge, The alloys such as molybdenum-iron carry out ladle alloying, molten iron proportion 73%；The steel scrap of addition is high-quality steel scrap, and the alloy of addition enters Row baking, to reduce the substitution of the gas contents such as nitrogen, hydrogen；
Foamed slag has been made in electric furnace smelting process, uniform decarburization, is reduced and is inhaled nitrogen, control electric furnace steel tapping terminal C be 0.20%, P is 0.010%, and residual element content meets design requirement, and the tapping temperature of molten steel is controlled at 1660 DEG C；With steel in tapping process Stream addition steel-core-aluminium 1.8kg/t steel, slag material 10kg/t steel；
2) LF stoves refine：LF stove refinings are carried out by the molten steel of electric furnace smelting；Whole process makes white slag in refining process, and white slag is protected Hold the time 30 minutes, control refining basicity of slag 3.3, feed Al line 1.0m/t steel, and ferrosilicon, Gao Meng, Gao Ge, molybdenum are added into stove The alloys such as iron, vanadium iron, make Si, Mn, Cr, Mo, V content in the claimed range of component ratio, Al 0.022%；LF stoves essence Before making steel water tapping, calcium line 1.5m/t steel is fed, carries out deformation processing of inclusion, reduces large inclusionses；
3) VD vacuum outgas：LF stoves are refined
Ladle afterwards carries out taking off Slag treatment, then carries out VD applications of vacuum, and vacuum is less than 67Pa, the retention time is 17 points Clock；The measure of process hydrogen, hydrogen content 1.2ppm are carried out after broken sky using hydrogen determinator；Soft blow argon is carried out again, and soft argon blowing time is 20 minutes；It is more preferable so as to reach using VD duplex bit manipulations simultaneously to properly increase LF external refinings, VD vacuum processing times Removal gas, field trash effect.
4) continuous casting：Monoblock type tundish is used by the ladle liquid of VD Fruit storages, reaches more preferable molding casting Effect；M-EMS and end electromagnetic agitation are used in continuous casting, to mitigate component segregation, improves steel uniformity；In Between Baogang's coolant-temperature gage be 1520 DEG C, the degree of superheat be 18 DEG C；For 180 × 220mm2Base type, it is 0.96m/min to control pulling rate；Strand Enter withdrawal straightening machine temperature for 910 DEG C；
5) hot rolling：The strand of continuous casting forming carries out Rolling Production using hot delivering technology of CC billets technique；Wherein, control during rolling Parameter is：515 DEG C of hot delivering technology of CC billets temperature, 1180 DEG C, heat time 2.0h of control heating furnace soaking zone temperature, start rolling temperature 1180 DEG C, 900 DEG C of finishing temperature；
6) cool down：Steel after rolling are carried out with wind sheltering stacking slow cooling to room temperature, obtains middle carbon vanadium-containing alloy hot rolled circular steel.
Embodiment 7
The preparation method of carbon vanadium steel comprises the following steps during a kind of drill steel is used：
1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomanganese, Gao Meng, Gao Ge, The alloys such as molybdenum-iron carry out ladle alloying, molten iron proportion 63%；The steel scrap of addition is high-quality steel scrap, and the alloy of addition enters Row baking, to reduce the substitution of the gas contents such as nitrogen, hydrogen；
Foamed slag has been made in electric furnace smelting process, uniform decarburization, is reduced and is inhaled nitrogen, control electric furnace steel tapping terminal C be 0.14%, P is 0.006%, and residual element content meets design requirement, and the tapping temperature of molten steel is controlled at 1625 DEG C；With steel in tapping process Stream addition steel-core-aluminium 2.4kg/t steel, slag material 12kg/t steel；
2) LF stoves refine：LF stove refinings are carried out by the molten steel of electric furnace smelting；Whole process makes white slag in refining process, and white slag is protected Hold the time 28 minutes, control refining basicity of slag 3.2, feed Al line 2.8m/t steel, and ferrosilicon, Gao Meng, Gao Ge, molybdenum are added into stove The alloys such as iron, vanadium iron, make Si, Mn, Cr, Mo, V content in the claimed range of component ratio, Al 0.058%；LF stoves essence Before making steel water tapping, calcium line 1.0m/t steel is fed, carries out deformation processing of inclusion, reduces large inclusionses；
3) VD vacuum outgas：Ladle after LF stoves are refined carries out taking off Slag treatment, then carries out VD applications of vacuum, vacuum It it is 19 minutes less than the 67Pa retention times；The measure of process hydrogen, hydrogen content 1.2ppm are carried out after broken sky using hydrogen determinator；Enter again Row soft blow argon, soft argon blowing time are 16 minutes；It is double using VD simultaneously to properly increase LF external refinings, VD vacuum processing times Station manipulation, so as to have the function that preferably to remove gas, field trash；
4) continuous casting：Monoblock type tundish is used by the ladle liquid of VD Fruit storages, reaches more preferable molding casting Effect；M-EMS and end electromagnetic agitation are used in continuous casting, to mitigate component segregation, improves steel uniformity；In Between Baogang's coolant-temperature gage be 1519 DEG C, the degree of superheat be 17 DEG C；For 180 × 220mm2Base type, it is 0.98m/min to control pulling rate；Strand Enter withdrawal straightening machine temperature for 900 DEG C；
5) hot rolling：The strand of continuous casting forming carries out Rolling Production using hot delivering technology of CC billets technique；Wherein, control during rolling Parameter is：570 DEG C of hot delivering technology of CC billets temperature, 1190 DEG C, heat time 2.5h of control heating furnace soaking zone temperature, start rolling temperature 1150 DEG C, 870 DEG C of finishing temperature；
6) cool down：Steel after rolling are carried out with wind sheltering stacking slow cooling to room temperature, obtains middle carbon vanadium-containing alloy hot rolled circular steel.
Embodiment 8
The preparation method of carbon vanadium steel comprises the following steps during a kind of drill steel is used：
1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomanganese, Gao Meng, Gao Ge, The alloys such as molybdenum-iron carry out ladle alloying, molten iron proportion 68%；The steel scrap of addition is high-quality steel scrap, and the alloy of addition enters Row baking, to reduce the substitution of the gas contents such as nitrogen, hydrogen；
Foamed slag has been made in electric furnace smelting process, uniform decarburization, is reduced and is inhaled nitrogen, control electric furnace steel tapping terminal C be 0.20%, P is 0.006%, and residual element content meets design requirement, and the tapping temperature of molten steel is controlled at 1628 DEG C；With steel in tapping process Stream addition steel-core-aluminium 1.7kg/t steel, slag material 13kg/t steel；
2) LF stoves refine：LF stove refinings are carried out by the molten steel of electric furnace smelting；Whole process makes white slag in refining process, and white slag is protected Hold the time 32 minutes, control refining basicity of slag 3.0, feed Al line 2.5m/t steel, and ferrosilicon, Gao Meng, Gao Ge, molybdenum are added into stove The alloys such as iron, vanadium iron, make Si, Mn, Cr, Mo, V content in the claimed range of component ratio, Al 0.042%；LF stoves essence Before making steel water tapping, calcium line 2.0m/t steel is fed, carries out deformation processing of inclusion, reduces large inclusionses；
3) VD vacuum outgas：Ladle after LF stoves are refined carries out taking off Slag treatment, then carries out VD applications of vacuum, vacuum It it is 22 minutes less than the 67Pa retention times；The measure of process hydrogen, hydrogen content 1.1ppm are carried out after broken sky using hydrogen determinator；Enter again Row soft blow argon, soft argon blowing time are 19 minutes；It is double using VD simultaneously to properly increase LF external refinings, VD vacuum processing times Station manipulation, so as to have the function that preferably to remove gas, field trash；
4) continuous casting：Monoblock type tundish is used by the ladle liquid of VD Fruit storages, reaches more preferable molding casting Effect；M-EMS and end electromagnetic agitation are used in continuous casting, to mitigate component segregation, improves steel uniformity；Adopt With 20 DEG C of Prepared by Low Superheat Pouring technologies, molten steel temperature in tundish is 1522 DEG C；For 180 × 220mm2Base type, controls the pulling rate to be 0.99m/min；Strand enters withdrawal straightening machine temperature for 940 DEG C；
5) hot rolling：The strand of continuous casting forming carries out Rolling Production using hot delivering technology of CC billets technique；Wherein, control during rolling Parameter is：560 DEG C of hot delivering technology of CC billets temperature, 1200 DEG C, heat time 2.2h of control heating furnace soaking zone temperature, start rolling temperature 1140 DEG C, 880 DEG C of finishing temperature；
6) cool down：Steel after rolling are carried out with wind sheltering stacking slow cooling to room temperature, obtains middle carbon vanadium-containing alloy hot rolled circular steel.
Embodiment 9
The preparation method of carbon vanadium steel comprises the following steps during a kind of drill steel is used：
1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomanganese, Gao Meng, Gao Ge, The alloys such as molybdenum-iron carry out ladle alloying, molten iron proportion 70%；The steel scrap of addition is high-quality steel scrap, and the alloy of addition enters Row baking, to reduce the substitution of the gas contents such as nitrogen, hydrogen；
Foamed slag has been made in electric furnace smelting process, uniform decarburization, is reduced and is inhaled nitrogen, control electric furnace steel tapping terminal C be 0.19%, P is 0.007%, and residual element content meets design requirement, and the tapping temperature of molten steel is controlled at 1630 DEG C；With steel in tapping process Stream addition steel-core-aluminium 1.9kg/t steel, slag material 11kg/t steel；
2) LF stoves refine：LF stove refinings are carried out by the molten steel of electric furnace smelting；Whole process makes white slag in refining process, and white slag is protected Hold the time 26 minutes, control refining basicity of slag 3.1, feed Al line 1.5m/t steel, and ferrosilicon, Gao Meng, Gao Ge, molybdenum are added into stove The alloys such as iron, vanadium iron, make Si, Mn, Cr, Mo, V content in the claimed range of component ratio, Al 0.038%；LF stoves essence Before making steel water tapping, calcium line 2.2m/t steel is fed, carries out deformation processing of inclusion, reduces large inclusionses；
3) VD vacuum outgas：Ladle after LF stoves are refined carries out taking off Slag treatment, then carries out VD applications of vacuum, vacuum It it is 20 minutes less than 67Pa, retention time；The measure of process hydrogen, hydrogen content 1.3ppm are carried out after broken sky using hydrogen determinator；Again Soft blow argon is carried out, soft argon blowing time is 20 minutes；Simultaneously to properly increase LF external refinings, VD vacuum processing times, using VD Duplexing bit manipulation, so as to have the function that preferably to remove gas, field trash；
4) continuous casting：Monoblock type tundish is used by the ladle liquid of VD Fruit storages, reaches more preferable molding casting Effect；M-EMS and end electromagnetic agitation are used in continuous casting, to mitigate component segregation, improves steel uniformity；In Between Baogang's coolant-temperature gage be 1518 DEG C, the degree of superheat be 16 DEG C；For 180 × 220mm2Base type, it is 0.96m/min to control pulling rate；Strand Enter withdrawal straightening machine temperature for 960 DEG C；
5) hot rolling：The strand of continuous casting forming carries out Rolling Production using hot delivering technology of CC billets technique；Wherein, control during rolling Parameter is：600 DEG C of hot delivering technology of CC billets temperature, 1190 DEG C, heat time 2.2h of control heating furnace soaking zone temperature, start rolling temperature 1140 DEG C, 870 DEG C of finishing temperature；
6) cool down：Steel after rolling are carried out with wind sheltering stacking slow cooling to room temperature, obtains middle carbon vanadium-containing alloy hot rolled circular steel.
Embodiment 10
The preparation method of carbon vanadium steel comprises the following steps during a kind of drill steel is used：
1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomanganese, Gao Meng, Gao Ge, The alloys such as molybdenum-iron carry out ladle alloying, molten iron proportion 74%；The steel scrap of addition is high-quality steel scrap, and the alloy of addition enters Row baking, to reduce the substitution of the gas contents such as nitrogen, hydrogen；
Foamed slag has been made in electric furnace smelting process, uniform decarburization, is reduced and is inhaled nitrogen, control electric furnace steel tapping terminal C be 0.18%, P is 0.010%, and residual element content meets design requirement, and the tapping temperature of molten steel is controlled at 1625 DEG C；With steel in tapping process Stream addition steel-core-aluminium 1.7kg/t steel, slag material 12kg/t steel；
2) LF stoves refine：LF stove refinings are carried out by the molten steel of electric furnace smelting；Whole process makes white slag in refining process, and white slag is protected Hold the time 35 minutes, control refining basicity of slag 3.2, feed Al line 1.6m/t steel, and ferrosilicon, Gao Meng, Gao Ge, molybdenum are added into stove The alloys such as iron, vanadium iron, make Si, Mn, Cr, Mo, V content in the claimed range of component ratio, Al 0.030%；LF stoves essence Before making steel water tapping, calcium line 1.9m/t steel is fed, carries out deformation processing of inclusion, reduces large inclusionses；
3) VD vacuum outgas：Ladle after LF stoves are refined carries out taking off Slag treatment, then carries out VD applications of vacuum, vacuum It it is 16 minutes less than 67Pa, retention time；The measure of process hydrogen, hydrogen content 1.1ppm are carried out after broken sky using hydrogen determinator；Again Soft blow argon is carried out, soft argon blowing time is 19 minutes；Simultaneously to properly increase LF external refinings, VD vacuum processing times, using VD Duplexing bit manipulation, so as to have the function that preferably to remove gas, field trash；
4) continuous casting：Monoblock type tundish is used by the ladle liquid of VD Fruit storages, reaches more preferable molding casting Effect；M-EMS and end electromagnetic agitation are used in continuous casting, to mitigate component segregation, improves steel uniformity；In Between Baogang's coolant-temperature gage be 1522 DEG C, the degree of superheat be 20 DEG C；For 180 × 220mm2Base type, it is 0.97m/min to control pulling rate；Strand Enter withdrawal straightening machine temperature for 930 DEG C；
5) hot rolling：The strand of continuous casting forming carries out Rolling Production using hot delivering technology of CC billets technique；Wherein, control during rolling Parameter is：520 DEG C of hot delivering technology of CC billets temperature, 1195 DEG C, heat time 2.2h of control heating furnace soaking zone temperature, start rolling temperature 1140 DEG C, 920 DEG C of finishing temperature；
6) cool down：Steel after rolling are carried out with wind sheltering stacking slow cooling to room temperature, obtains middle carbon vanadium-containing alloy hot rolled circular steel.
The specific process parameter of the various embodiments described above is shown in Tables 1 and 2.Table 1 is during the drill steel prepared by embodiment 1-10 is used The component and its content of carbon vanadium steel；Table 2 be embodiment 1-10 drill steels use in carbon vanadium steel preparation process in Continuous casting and hot rolling technology condition, including molten steel in bakie in continuous casting temperature, casting speed, strand hot sending temperature, slab heating temperature, Time and rolling temperature.
The component and its content of carbon vanadium steel during drill steel prepared by the embodiment 1-10 of table 1 is used
Continuous casting and the process conditions of hot rolling in the embodiment 1-10 of table 2
The macrostructure of drill steel carbon vanadium steel in prepared by above-described embodiment 1-10 (is seen under low power state The macrostructure's pattern observed), non-metallic inclusion, grain size it is as shown in table 3；Sample quenched (900 ± 15 DEG C of oil)+tempering After (630 ± 50 DEG C of water) heat treatment, its mechanical property is tested, after (865 ± 5 DEG C) water quenching, tests quenching degree；In each embodiment Mechanical property, the quenching degree of carbon vanadium steel are as shown in table 4 during prepared drill steel is used.
The macrostructure of carbon vanadium steel, non-metallic inclusion, grain size during drill steel prepared by the embodiment 1-10 of table 3 is used Rank
Mechanical property, the quenching degree of carbon vanadium steel during drill steel prepared by the embodiment 1-10 of table 4 is used
Carbon vanadium steel during selection example 1 and the drill steel prepared by embodiment 5 are used in above-described embodiment, it is quenched (900 ± 15 DEG C of oil)+tempering (630 ± 50 DEG C of water) heat treatment after, 300 DEG C, 350 DEG C, 400 DEG C, 450 DEG C, 500 DEG C, 550 DEG C, 600 DEG C, examine high-temperature behavior at a temperature of 650 DEG C, be shown in Table 5.
The high-temperature behavior of carbon vanadium steel during drill steel prepared by the embodiment 1 of table 5 and embodiment 5 is used
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention God and principle within, any modification, equivalent substitution and improvements made etc., accompanying claims protection domain of the present invention it It is interior.

Claims (11)

  1. Carbon vanadium steel during 1. a kind of drill steel is used, it is characterised in that the steel alloy includes by weight percentage following Component：C, 0.33-0.38%；Si, 0.17-0.37%；Mn, 0.50-0.70%；Cr, 1.00-1.20%；P ,≤0.025%； S ,≤0.020%；Mo, 0.20-0.30%；V, 0.10-0.15%；Al, 0.015-0.060%；O ,≤0.0015%；Surplus is Fe and inevitable impurity；
    The preparation method of carbon vanadium steel comprises the following steps during the drill steel is used：
    1) electric furnace smelting：Feed stock for blast furnace is molten iron and steel scrap, and in predetermined component ratio add silicomangan, high manganese, High-chromium alloy, ferro-molybdenum carry out ladle alloying；Electric furnace steel tapping terminal C >=0.10%, P≤0.010% are controlled, molten steel goes out Steel temperature is at 1620-1660 DEG C；In tapping process steel-core-aluminium 1.5-2.5kg/t steel, slag material 10-15kg/t are added with steel stream Steel；
    2) LF stoves refine：Molten steel in step 1) by electric furnace smelting is subjected to LF stove refinings；Whole process makes white slag in refining process, White slag retention time >=25 minute, it is 3.0-3.3 to control refining basicity of slag, feeds Al line 1.0-3.0m/t steel, ensures molten steel Al >=0.030%；And Antaciron, high manganese, high-chromium alloy, ferro-molybdenum, vanadium iron are added into stove；LF stove purified steels Before water tapping, calcium line 1.0-2.5m/t steel is fed；
    3) VD vacuum outgas：Ladle after LF stoves refining in step 2) is carried out taking off Slag treatment, then carries out VD applications of vacuum, very Reciprocal of duty cycle is less than 67Pa, the retention time is >=15 minutes；Process hydrogen is measured after broken sky, hydrogen content is not more than 2.0ppm；Again Soft blow argon is carried out, soft argon blowing time is >=15 minutes；
    4) continuous casting：Ladle liquid through VD Fruit storages in step 3) using monoblock type tundish, M-EMS and The mode of end electromagnetic agitation is poured into a mould；The cast is operated using three perseverances of constant level, stationary temperature and permanent pulling rate；Strand enters Withdrawal straightening machine temperature is 900-980 DEG C；
    5) hot rolling：Rolling Production is carried out using hot delivering technology of CC billets technique to the strand of the continuous casting forming in step 4)；Wherein, roll When control parameter be：Hot delivering technology of CC billets temperature >=500 DEG C, 1180-1220 DEG C of control heating furnace soaking zone temperature, continuous casting billet Heat time is 2.0-3.0h, 1100-1180 DEG C of start rolling temperature, 850-950 DEG C of finishing temperature；
    6) cool down：Wind sheltering stacking slow cooling is carried out to room temperature to the steel after being rolled in step 5), obtains middle carbon vanadium-containing alloy hot rolling Round steel.
  2. Carbon vanadium steel during 2. drill steel as claimed in claim 1 is used, it is characterised in that the steel alloy includes by weight hundred Divide following components than counting：C, 0.34-0.36%；Si, 0.20-0.30%；Mn, 0.60-0.70%；Cr, 1.10-1.20%； P ,≤0.015%；S ,≤0.010%；Mo, 0.22-0.26%；V, 0.12-0.15%；Al, 0.025-0.050%；O ,≤ 0.0012%；Surplus is Fe and inevitable impurity.
  3. Carbon vanadium steel during 3. drill steel as claimed in claim 1 is used, it is characterised in that
    Mass percent >=60% of the molten iron added in step 1), to reduce power consumption.
  4. Carbon vanadium steel during 4. drill steel as claimed in claim 1 is used, it is characterised in that in step 1), the electric furnace steel tapping Terminal C is 0.13-0.16%, P 0.008-0.010%, and the tapping temperature of molten steel is 1630-1650 DEG C；In tapping process with Steel-core-aluminium 2.0-2.5kg/t steel, the slag material 11-14kg/t steel of steel stream addition.
  5. Carbon vanadium steel during 5. drill steel as claimed in claim 1 is used, it is characterised in that in step 1), into the electric furnace When adding silicomangan, high manganese, high-chromium alloy, ferro-molybdenum progress ladle alloying, make Si controls in 0.12- 0.20%, Mn control are in 0.50-0.60%, and in 0.90-1.10%, Mo is controlled in 0.18-0.22% for Cr controls, to mitigate refining Process alloy adds pressure；The alloy added in step 1) is toasted, to reduce the substitution of nitrogen, hydrogen content.
  6. Carbon vanadium steel during 6. drill steel as claimed in claim 1 is used, it is characterised in that in step 2), the refining process The middle white slag retention time is 28-35 minutes, and refining basicity of slag is 3.1-3.3, feeds Al line 2.0-2.8m/t steel, and molten steel Al is 0.035-0.045%.
  7. Carbon vanadium steel during 7. drill steel as claimed in claim 1 is used, it is characterised in that in step 3), at the VD vacuum The retention time of reason is 18-25 minutes；Hydrogen content after the broken sky is no more than 1.5ppm；Soft argon blowing time is 20-30 points Clock.
  8. Carbon vanadium steel during 8. drill steel as claimed in claim 1 is used, it is characterised in that in step 4), the constant level, perseverance Temperature and three perseverances of permanent pulling rate operate and are：Using 15-25 DEG C of Prepared by Low Superheat Pouring technology, molten steel temperature in tundish 1517- 1527℃；Stable pouring basket liquid level, control liquid level fluctuation of crystallizer is between -3mm~3mm；For 180 × 220mm2Continuous casting Base, it is 0.95-1.10m/min to control pulling rate, for 260 × 300mm2Continuous casting billet, it is 0.50-0.60m/min to control pulling rate.
  9. Carbon vanadium steel during 9. drill steel as claimed in claim 1 is used, it is characterised in that hot delivering technology of CC billets described in step 5) Temperature is 520-550 DEG C, 1200-1220 DEG C of the heating furnace soaking zone temperature, and 1130-1170 DEG C of the start rolling temperature is described 920-940 DEG C of finishing temperature；The continuous casting billet is 180 × 220mm2Heat time during base type is 2.0-2.5h, the continuous casting Base is 260 × 300mm2Heat time during base type is 2.5-3.0h.
  10. Carbon vanadium steel during 10. drill steel as claimed in claim 3 is used, it is characterised in that the mass percent of the molten iron For 68.8-72.5%.
  11. Carbon vanadium steel during 11. drill steel as claimed in claim 5 is used, it is characterised in that the time of the baking is that 1-2 is small When, temperature is 200-400 DEG C.
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