CN110527909A - A kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J - Google Patents

A kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J Download PDF

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CN110527909A
CN110527909A CN201910858103.4A CN201910858103A CN110527909A CN 110527909 A CN110527909 A CN 110527909A CN 201910858103 A CN201910858103 A CN 201910858103A CN 110527909 A CN110527909 A CN 110527909A
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steel
slag
temperature
titanium
low
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王德勇
齐锐
张群
卢秉军
齐峰
阚开
赵千水
张涛
李涛
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Bengang Steel Plates Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/068Decarburising
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    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • C22C33/06Making ferrous alloys by melting using master alloys
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    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/008Ferrous alloys, e.g. steel alloys containing tin
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/60Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention belongs to field of metallurgy, and in particular to a kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J.Technical scheme is as follows: include the following steps: 1) EBT electric furnace smelting: using steel scrap hot metal charging as furnace charge, for steel scrap using the high-quality steel scrap of element free from foreign meter, matching is 15~35%;Molten iron uses low-phosphorous, low-sulfur molten iron, proportion 65~85%;2) LF refining: carrying out energization slugging 10min, and fishing slag operation is carried out after scorification is good;Then Al line is fed;Diffusion deoxidizer is added;By composition adjustment to target after deoxidation is good;3) Al VD vacuum outgas: is adjusted to 0.025~0.035%;Enter 1570~1610 DEG C of VD temperature, vacuum degree reaches 100Pa hereinafter, retention time >=20min;4) continuous casting: square billet in continuous casting mechanism;5) heating rolling: slab is rolled as bar.The present invention both ensure that the indexs such as hypoxemia, low calcium, the low inclusion content of bearing steel, and it is horizontal in turn ensure that the Ti content of bearing steel has reached superfine high-quality bearing steel quality.

Description

A kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J
Technical field
The invention belongs to field of metallurgy, and in particular to a kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J.
Background technique
Bearing steel is a kind of important steel material, and the nitride in bearing steel mainly exists with TiN or TiCN, titanium nitride It is a kind of hard and crisp field trash, it is extremely harmful to the fatigue life of steel, the axis that present downstream user produces smelter It is increasingly tighter (such as field trash, carbide) to hold the requirement of steel internal metallurgical quality, especially to large inclusions TiN in steel Size, quantity and Spreading requirements are harsh, this is because 1. titanium nitride (TiN) field trash destroys the continuity of steel matrix, outside Add and is also easy to produce stress concentration in the case of deformation force;2. steel is in deformation or heat treatment, due to the heat of metallic matrix and TiN field trash The coefficient of expansion is different, forms initial crack in metal and TiN field trash interface, is the tired source of the further fatigue rupture of metal; 3. TiN field trash is hard, is in angular, chip off-falling when easily leading to bearing element influences fatigue life.As far as possible by the Ti content in steel It reduces, reduces a possibility that it forms nitridation titanium inclusion, requirement of the bearing steel for titanium is more lower better.GB/T18254- Bearing steel is divided into three grades by 2016, and respectively high-quality, high-duty cast, superfine are high-quality, and superfine high-quality bearing steel requires steel Middle Ti content≤15ppm.
The maximum technological difficulties for smelting ultralow titanium bearing steel are the control of Ti content, the titanium in steel it is most of from Ferroalloy, the alloy that production bearing steel uses includes ferrochrome, manganese iron, ferrosilicon etc., therefore in order to reduce Ti content, currently used Smelting process first choice is using the lower alloy of titaniferous.
It generallys use now and is relatively easy to realize using the smelting process steel of low titanium ferrochromium production low titanium bearing steel, but is real The production of existing ultralow titanium bearing steel (Ti≤15ppm), low titanium alloy, which is only used only, can not meet Ti content control requirement.
Summary of the invention
The present invention provides the preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J a kind of, both ensure that bearing steel hypoxemia, It is horizontal in turn ensure that the Ti content of bearing steel has reached superfine high-quality bearing steel quality for the indexs such as low calcium, low inclusion content.
Technical scheme is as follows:
A kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J, includes the following steps:
1) EBT electric furnace smelting: using steel scrap hot metal charging as furnace charge, steel scrap is using the high-quality useless of element free from foreign meter Steel, matching is 15~35%;Molten iron uses low-phosphorous, low-sulfur molten iron, proportion 65~85%;1555~1585 DEG C of oxidizing temperature, out 1635~1650 DEG C of steel temperature;Molten steel composition controls by mass percentage are as follows: and C:0.96~1.04%, Si:0.18~ 0.30%, Mn:0.30~0.42%, P: ≯ 0.020%, S: ≯ 0.012%, Cr:1.42~1.56%, Mo: ≯ 0.08%, Al: ≯ 0.05%, Cu:0.05~0.10%, Ni: ≯ 0.20%, O: ≯ 0.0006%, Ti: ≯ 0.0015%, Ca: ≯ 0.0010%, Pb: ≯ 0.002%, Sb: ≯ 0.005%, Sn: ≯ 0.03%, As: ≯ 0.04%, surplus is for iron and unavoidably Impurity;
2) LF refining: carrying out energization slugging 10min, and fishing slag operation is carried out after scorification is good;Then Al line is fed;Diffusion is added Deoxidier;By composition adjustment to target after deoxidation is good;
3) Al VD vacuum outgas: is adjusted to 0.025~0.035%;Enter 1570~1610 DEG C of VD temperature, vacuum degree reaches 100Pa is hereinafter, retention time >=20min;
4) continuous casting: square billet in continuous casting mechanism;
5) heating rolling: slab is rolled as bar.
The preparation method of the beating steel GCr15 of ultralow titanium containing the Cu-J, preferred embodiment is, in the step 1), smelting Refining overall process does not allow to make using calcium or calcium alloy deoxidier, and smelting overall process should prevent titanium from polluting, and does not allow directly in titaniferous It is produced after steel grade, secondary postpartum scheduled production need to be poured in Ti≤50ppm bearing steel, ladle is using above pouring time bearing steel ladle;With C amount >= 1.10%, slag, decarburization weight >=0.30% are flowed in dioxygen oxidation, fierceness boiling automatically;Tapping requires: C is≤0.010%, to protect It demonstrate,proves and contains a certain amount of oxygen in steel, it can be by the titanium oxidation removal in alloy in alloying;P≤0.010%, other remaining members Plain qualified, pre-deoxidant, carburant, ferroalloy and slag charge is added in when tapping 1/4~1/3.
The preparation method of the beating steel GCr15 of ultralow titanium containing the Cu-J, preferred embodiment are that the pre-deoxidant is low Carbon duriron;The ferroalloy includes low titanium Gao Ge, middle manganese, copper scrap;The slag charge includes active lime, alumina powder.
The preparation method of the beating steel GCr15 of ultralow titanium containing the Cu-J, preferred embodiment are in the step 2), to adopt The oxidizing slag during electric furnace steel tapping is skimmed with slag pan fishing slag, content of titanium dioxide in slag is reduced, reduces the reduction of titanium, then Al in steel is adjusted to 0.02%-0.04% by 100~120 meters of Al line of feeding, LF Whole Process Control Al≤0.050%, first 1~3kg/t of diffusion deoxidizer is added and is diffused deoxidation, second batch diffusion deoxidizer, diffusive deoxidation is added in closed furnace door 10min Total 2~the 4kg/t of additional amount of agent, temperature conforms to seek a sample after slag is white;Refining overall process does not allow to use deoxidier containing Ca; Continue diffusive deoxidation after complete analysis, keeps reducing atmosphere to bull ladle, the white slag retention time is no less than 25min;Deoxidation is well pressed afterwards The low titanium Gao Ge of baking, middle manganese, low-carbon ferrosilicon is added in control composition target, by composition adjustment to target;Whole-process control Ar Pressure 0.2~0.3MPa of power, is fluctuated with the top of the slag, subject to molten steel is not exposed, prevents molten steel is exposed from causing secondary oxidation.
The preparation method of the beating steel GCr15 of ultralow titanium containing the Cu-J, preferred embodiment is, in the step 3), feeds Quiet argon blowing time >=25min, 0.1~0.3MPa of argon pressure after line subject to molten steel is not exposed, are prevented secondary with top of the slag fine motion Oxidation;Bull ladle temperature is controlled at 1525~1545 DEG C.
The preparation method of the beating steel GCr15 of ultralow titanium containing the Cu-J, preferred embodiment is, in the step 4), even It is big to wrap 1525~1535 DEG C of the first furnace temperature, even pour 1505~1515 DEG C when casting, 1570~1575 DEG C of tundish temperature, pulling rate 0.75m/min, secondary cooling water specific water 0.25L/kg, M-EMS Current 450A, end electromagnetic agitation electric current 330A, frequency Rate 8Hz;The casting of strict implement total process protective, crystallizer protecting residue use dedicated high-carbon steel covering slag;Slab soaking time >= 30h。
The preparation method of the beating steel GCr15 of ultralow titanium containing the Cu-J, preferred embodiment are in the step 5), to add Thermal recovery is heated with heat accumulating type walking beam reheating furnace, and 1235 DEG C of heating temperature, soaking time 98min, total heating time 380~448 Minute;1180~1200 DEG C of tapping temperature;Rolling is using 800 blooming mills, 650 finishing mills;Wherein start rolling temperature 1100~ 1200 DEG C, 850~1000 DEG C of finishing temperature, slow cooling should be carried out in time by rolling rear steel;Steel, which enter, cheats temperature >=550 DEG C, out hole temperature ≤ 200 DEG C of degree, soaking time >=48h;Finishing temperature target control is at 750~850 DEG C.
It reasonably selects process route the invention has the benefit that the present invention passes through, rationally design technological parameter, so that steel Degree of purity is high, inclusion behavior is low;Ti content can control within 15ppm, oxygen content can control within 6ppm, round steel Surface quality is good, and quality is stablized, and the demand of domestic and international ultralow titanium bearing steel client is fully met.By using high-quality steel scrap It is raw material with molten iron, ensure that the degree of purity of molten steel before refining;By control EBT endpoint carbon content, reduce finishing slag oxygen content and Oxidizing slag is excluded using fishing slag technique, reduces the oxidisability before refining in slag;It is refined by LF white slag and micro-pressure operation, it is maximum The removal steel inclusion of limit;Further cleaning molten steel is operated by soft blow after VD circulation and VD;It is protected by continuous casting overall process Shield casting and M-EMS technical application prevent molten steel secondary oxidation and inclusion floating are promoted to exclude.The above is arranged It applies and ensure that molten steel has lower oxygen content and inclusion content.It is closed by using low titanium is added before the deoxidation in tapping process Titaniferous steel slag using the oxygen in molten steel by the titanium oxidation removal in alloy, and is removed using fishing slag technique, can prevent essence by gold The reduction of titanium dioxide during refining, refining slagging process prevent the reduction of titanium dioxide using weak deoxidier, and continuous casting process makes It is final to realize that molten steel has lower Ti content with low titanium covering slag.Refining process is forbidden using calcium containing alloy and deoxidier, from And guarantee lower calcium content in steel.
Specific embodiment
A kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J, includes the following steps:
1) EBT electric furnace smelting
Ingredient is that 38t molten iron matches 15t steel scrap;It is blown into oxygen into molten steel by supersonic speed oxygen rifle and takes off C, fierceness is boiled, certainly Dynamic stream slag, 1580 DEG C of oxidizing temperature, C is 0.05%, P 0.006% when tapping, and other residual elements are qualified, 1645 DEG C of temperature, Tap 1/4 when be added pre-deoxidant low-carbon ferrosilicon 50kg, carburant 300kg, ferroalloy (the high chromium 900kg of low titanium, middle manganese 120kg, Copper scrap 40kg), slag charge (active lime 300kg, alumina powder 50kg).
2) LF refining
Energization slag 10min is carried out after entering the station, fishing slag operation is carried out after scorification is good, and slag is fished out for electric furnace steel tapping mistake using slag pan Oxidizing slag in journey skims, and fishes out 3 disk slags altogether.Then 100 meters of Al line are fed, Al in steel is adjusted to 0.035%, LF overall process control Al≤0.050% processed, first is added diffusion deoxidizer 105kg/t and is diffused deoxidation, and second batch is added in closed furnace door 10min, Total additional amount 120kg/t, temperature conforms to seek a sample after slag is white;Continue diffusive deoxidation after complete analysis, keeps reducing atmosphere To bull ladle, white slag retention time 28min.Low titanium Gao Ge, the middle manganese, low-carbon of baking is well added in deoxidation by control composition target afterwards The alloys such as ferrosilicon, by composition adjustment to target.Whole-process control 0.2~0.3MPa of argon pressure, is fluctuated, molten steel is not exposed with the top of the slag Subject to, prevent molten steel is exposed from causing secondary oxidation.1590 DEG C of bull ladle temperature.
3) VD degassing process
Enter 1585 DEG C of VD temperature, Al content 0.035%.Vacuum degree reaches 100Pa hereinafter, retention time 25min.After line feeding Quiet argon blowing time 28min, argon pressure 0.25MPa subject to molten steel is not exposed, prevent secondary oxidation with top of the slag fine motion.Bull ladle temperature Degree is at 1520 DEG C.
4) continuous casting
Big 1515 DEG C of platform temperature of packet, 1574 DEG C of tundish temperature, 1572 DEG C, 1573 DEG C, pulling rate 0.75m/min, two is cold Water specific water 0.25L/kg, M-EMS Current 450A, end electromagnetic agitation electric current 330A, frequency 8Hz.Strict implement Total process protective casting, crystallizer protecting residue use dedicated high-carbon steel covering slag.Slab soaking time 35h.
5) heating rolling
Heating is heated using heat accumulating type walking beam reheating furnace, and 1235 DEG C of heating temperature, soaking time 98min, always when heating Between 420 minutes.1190 DEG C of tapping temperature.Rolling is using 800 blooming mills, 650 mm finishing mill units.Wherein start rolling temperature 1120 DEG C, 950 DEG C of finishing temperature, slow cooling should be carried out in time by rolling rear steel.Steel, which enter, cheats temperature >=550 DEG C, cheats temperature≤200 DEG C out, Soaking time >=48h.
Product chemical component is as shown in Table 1.
One chemical component of table (mass percent)/%
C Si Mn P S Cu Alt Cr Ni
0.97 0.22 0.31 0.017 0.002 0.07 0.018 1.46 0.02
Mo Sb Sn As Pb Bi O Ti Ca
0.01 0.0001 0.0014 0.0010 0.0014 0.0001 0.0005 0.0012 0.0005
Product field trash A, B class is 0.5 grade, and C, D, Ds class are 0 grade;Wherein Ti constituent content control exists 0.0012%, Control for Oxygen Content is 0.0005%, while degree of purity with higher.

Claims (7)

1. a kind of preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J, which comprises the steps of:
1) EBT electric furnace smelting: using steel scrap hot metal charging as furnace charge, steel scrap using element free from foreign meter high-quality steel scrap, Proportion is 15~35%;Molten iron uses low-phosphorous, low-sulfur molten iron, proportion 65~85%;1555~1585 DEG C of oxidizing temperature, tapping temperature 1635~1650 DEG C of degree;Molten steel composition controls by mass percentage are as follows: C:0.96~1.04%, Si:0.18~0.30%, Mn:0.30~0.42%, P: ≯ 0.020%, S: ≯ 0.012%, Cr:1.42~1.56%, Mo: ≯ 0.08%, Al: ≯ 0.05%, Cu:0.05~0.10%, Ni: ≯ 0.20%, O: ≯ 0.0006%, Ti: ≯ 0.0015%, Ca: ≯ 0.0010%, Pb: ≯ 0.002%, Sb: ≯ 0.005%, Sn: ≯ 0.03%, As: ≯ 0.04%, surplus is iron and inevitable impurity;
2) LF refining: carrying out energization slugging 10min, and fishing slag operation is carried out after scorification is good;Then Al line is fed;Diffusive deoxidation is added Agent;By composition adjustment to target after deoxidation is good;
3) Al VD vacuum outgas: is adjusted to 0.025~0.035%;Enter 1570~1610 DEG C of VD temperature, vacuum degree reaches 100Pa is hereinafter, retention time >=20min;
4) continuous casting: square billet in continuous casting mechanism;
5) heating rolling: slab is rolled as bar.
2. the preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J according to claim 1, which is characterized in that the step It is rapid 1) in, smelting overall process does not allow to make using calcium or calcium alloy deoxidier, and smelting overall process should prevent titanium from polluting, and does not allow straight It connects and is produced after Ti-containing steel, secondary postpartum scheduled production need to be poured in Ti≤50ppm bearing steel, ladle is using above pouring time bearing steel Packet;With C amount >=1.10%, dioxygen oxidation, slag, decarburization weight >=0.30% are flowed in fierceness boiling automatically;Tapping require: C be≤ 0.010%, P≤0.010%, other residual elements are qualified, and pre-deoxidant, carburant, ferroalloy is added in when tapping 1/4~1/3 And slag charge.
3. the preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J according to claim 2, which is characterized in that described pre- Deoxidier is low-carbon ferrosilicon;The ferroalloy includes low titanium Gao Ge, middle manganese, copper scrap;The slag charge includes active lime, aluminium oxide Powder.
4. the preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J according to claim 1, which is characterized in that the step It is rapid 2) in, the oxidizing slag during electric furnace steel tapping skimmed using slag pan fishing slag, content of titanium dioxide in slag is reduced, reduces titanium Then reduction feeds 100~120 meters of Al line, Al in steel is adjusted to 0.02%-0.04%, and LF Whole Process Control Al≤ 0.050%, first is added 1~3kg/t of diffusion deoxidizer and is diffused deoxidation, and it is de- that second batch diffusion is added in closed furnace door 10min Oxygen agent, the total 2~4kg/t of additional amount of diffusion deoxidizer, temperature conforms to seek a sample after slag is white;Refining overall process does not allow to make With deoxidier containing Ca;Continue diffusive deoxidation after complete analysis, keeps reducing atmosphere to bull ladle, the white slag retention time is no less than 25min; Low titanium Gao Ge, the middle manganese, low-carbon ferrosilicon of baking is well added in deoxidation by control composition target afterwards, by composition adjustment to target;Entirely Process control 0.2~0.3MPa of argon pressure, is fluctuated with the top of the slag, subject to molten steel is not exposed, prevents molten steel is exposed from causing secondary oxidation.
5. the preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J according to claim 1, which is characterized in that the step It is rapid 3) in, quiet argon blowing time >=25min, 0.1~0.3MPa of argon pressure after line feeding, with top of the slag fine motion, subject to molten steel is not exposed, Prevent secondary oxidation;Bull ladle temperature is controlled at 1525~1545 DEG C.
6. the preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J according to claim 1, which is characterized in that the step It is rapid 4) in, it is big to wrap 1525~1535 DEG C of the first furnace temperature, even pour 1505~1515 DEG C when continuous casting, tundish temperature 1570~ 1575 DEG C, pulling rate 0.75m/min, secondary cooling water specific water 0.25L/kg, M-EMS Current 450A, end electromagnetic agitation Electric current 330A, frequency 8Hz;The casting of strict implement total process protective, crystallizer protecting residue use dedicated high-carbon steel covering slag;Slab Soaking time >=30h.
7. the preparation method of the beating steel GCr15 of ultralow titanium containing Cu-J according to claim 1, which is characterized in that the step It is rapid 5) in, heating using heat accumulating type walking beam reheating furnace heat, 1235 DEG C of heating temperature, soaking time 98min, total heating time 380~448 minutes;1180~1200 DEG C of tapping temperature;Rolling is using 800 blooming mills, 650 finishing mills;Wherein open rolling temperature 1100~1200 DEG C of degree, 850~1000 DEG C of finishing temperature, slow cooling should be carried out in time by rolling rear steel;Steel enter to cheat temperature >=550 DEG C, temperature≤200 DEG C, soaking time >=48h are cheated out;Finishing temperature target control is at 750~850 DEG C.
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CN110964984A (en) * 2019-12-30 2020-04-07 本钢板材股份有限公司 Steel SAE4160M for middle and large automobile shaft sleeve and production process thereof
CN111004962A (en) * 2019-12-30 2020-04-14 本钢板材股份有限公司 Steel BG80MnCr for steel balls of ball mill and preparation method thereof

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