CN107119239A - Bearing steel and preparation method thereof - Google Patents

Bearing steel and preparation method thereof Download PDF

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Publication number
CN107119239A
CN107119239A CN201710232803.3A CN201710232803A CN107119239A CN 107119239 A CN107119239 A CN 107119239A CN 201710232803 A CN201710232803 A CN 201710232803A CN 107119239 A CN107119239 A CN 107119239A
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equal
less
steel
bearing steel
rolling
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王宇远
张成连
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Longnan Reachall New Material Development Co Ltd
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Longnan Reachall New Material Development Co Ltd
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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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

Abstract

The invention discloses a kind of bearing steel, its each component percentage is：C：0.75~0.85%；Si：0.15~0.35%；Mn：0.25~0.40%；Cr：1.40~1.60%；Ni：0.05~0.09%；Mo：0.02~0.08%；Al：0.005~0.020%；Cu：0.02~0.08%；Ce：0.005~0.03%；P：Less than or equal to 0.010%；S：Less than or equal to 0.008%；Ti：Less than or equal to 0.0020%；O：Less than or equal to 0.0008%；As：Less than or equal to 0.012%；Sn：Less than or equal to 0.002%；Sb：Less than or equal to 0.0050%；Pb：Less than or equal to 0.0020%；Ca：Little Yu Deng Yu≤0.0010%；Surplus is Fe.The bearing steel of the present invention is than traditional GCr15 steel ratio, and chemical composition has significantly different, reduces carbon content, adds micro alloying element：Ni, Mo, Cu, cerium, five kinds of elements of aluminium so that its technology quality index is significantly improved than traditional GCr15 steel, and service life is doubled.The invention also discloses a kind of preparation method of bearing steel.

Description

Bearing steel and preparation method thereof
Technical field
The present invention relates to new material technology field, more particularly to a kind of bearing steel and preparation method thereof.
Background technology
The tradition Grand Equipments such as China's precision machine tool, metallurgical equipment, weight equipment, high-end automobile and wind-power electricity generation, high speed Emerging strategic industry such as railway and Aero-Space etc. is the mainstay industry of China's industrial system, and its middle (center) bearing is very crucial Part, the height of its service life and reliability determines the quality of host performance to a certain extent.With China's science Technology is developed rapidly, in many high-end fields, such as Aeronautics and Astronautics, traffic, the energy (wind-powered electricity generation, solar energy, nuclear power), ocean work Journey proposes many new requirements to bearing used, and it is also constantly expanded using scope, therefore, new to used bearing material Performance and quality on it is also proposed more requirements, such as Aero-engine Bearing needs to work under the high temperature conditions, thus need High-temperature bearing is wanted to manufacture；Atomic energy industry is needed using anticorrosive, resistance to irradiation and the particular/special requirement such as nonmagnetic, it is therefore desirable to adopted Manufactured with stainless bearing or nonmagnetic corrosion-resistant stainless bearing steel material；Various war products are also inseparable with bearing, such as aircraft, army The sophisticated weapons such as warship, guided missile, radar, tank artillery be unable to do without bearing, and these bearings are required for using a variety of axles Corbel material is manufactured, it may be said that the application of field of bearings is more and more extensive, also more and more important, the special bearing having had at present The species and performance of steel far can not meet its demand, therefore, it is necessary to which great dynamicses research and develop new high life bearing steel to meet The demand of bearing industry development and scientific and technological progress and the demand for crossing national defense industry, to ensureing China's science and technology and national defense industry Development play extremely important effect.
Minimum 500,000 kilometers with bearing service life of Foreign Automobile gear-box, domestic about 100,000 kilometers of the similar bearing life-span, And reliability stability is poor.State's outer bearing high speed performance index D n values can reach 3.3 × 106, and China's like product highest is not More than 2.5 × 106；The current state's inner bearing of bearing used for high-speed railway all relies on import, Europe, day each 50%, constrains China high The further development of iron technology.Therefore, the crucial bearing of China's production and the bearing of Japan, the production of America and Europe Guo Deng advanced countries exist There is larger gap in terms of service life, reliability, Dn values and bearing capacity, have become restriction China equipment manufacture The bottleneck of development.
Either China's national standard, or the advanced country such as Japan, America and Europe standard, using containing C1.0%, Cr1.5% as The high-carbon-chromium bearing steel of representative, is born so far, chemical element has almost no change from it, but with the swift and violent hair of science and technology Exhibition, very harsh requirement is proposed to bearing, while improving velocity of rotation, improving operating temperature, is also required higher Reliability and life-span；The continuous increase of bearing size, it is desirable to higher quenching degree；The appearance of office automated machine, it is desirable to right The suppression of small size bearing noise.Due to the requirement more and more higher to bearing, bearing material must possess high cleanliness, high reliability And high fatigue life.
The content of the invention
It is an object of the present invention to provide the bearing steel of high life a kind of and its heat treatment method, at least one is which solved above-mentioned Technical problem.
The present invention solves technical problem and adopted the following technical scheme that：A kind of bearing steel, its each component percentage For：
C：0.75~0.85%；
Si：0.15~0.35%；
Mn：0.25~0.40%；
Cr：1.40~1.60%；
Ni：0.05~0.09%；
Mo：0.02~0.08%；
Al：0.005~0.020%；
Cu：0.02~0.08%；
Ce：0.005~0.03%；
P：Less than or equal to 0.010%；
S：Less than or equal to 0.008%；
Ti：Less than or equal to 0.0020%；
O：Less than or equal to 0.0008%；
As：Less than or equal to 0.012%；
Sn：Less than or equal to 0.002%；
Sb：Less than or equal to 0.0050%；
Pb：Less than or equal to 0.0020%；
Ca：Little Yu Deng Yu≤0.0010%；
Surplus is Fe.
Optionally, the percentage by weight of the C is 0.76-0.80%.
Optionally, the percentage by weight of the Cr is 1.50-1.55%.
Optionally, the percentage by weight of the Mn is 0.35-0.40%.
The present invention solves technical problem and adopted the following technical scheme that：A kind of preparation method of bearing steel, it includes following step Suddenly：
S10, by comprising above-mentioned element and content bearing steel tap, steel ingot or continuous casting are obtained by ingot casting or continuous casting Base；
S15, heating；3-7 tons of steel ingots or Ф 310-500mm continuous casting billets are put into heating furnace and are heated to 1220-1250 DEG C, Soaking time is more than 6 hours, rolling of coming out of the stove；
S20, rolling；3-7 tons of steel ingots or Ф 310mm continuous casting billets are hung out into heating furnace, 1200-1220 DEG C of start rolling temperature is whole 850-900 DEG C of temperature is rolled, 160mm is rolled into2Strip plate enters to cheat slow cooling；
S25, slow cooling；160mm after rolling2Strip plate enters to cheat slow cooling 60 hours；Go out when strip plate temperature is less than or equal to 200 DEG C Hole；
S30, finishing；160mm after rolling2Strip plate surface strips off the skin cleaning through emery wheel, removes decarburized layer；
S35, reheating；By 160mm2Strip plate be put into heating stove heat, be heated to 1160~1200 DEG C, soaking zone is protected Temperature, 1160-1180 DEG C of holding temperature, soaking time is more than 110 minutes；The time sum of the heating and reheating is more than 330 minutes；
S40, secondary rolling；With the 160mm after heating2Strip plate, is rolled into Ф 5.5mm, Ф 7mm, Ф 14mm disk round wires materials；
S45, slow cooling；It is rolled into after Ф 5.5mm, Ф 7mm, Ф 14mm disk round wires materials, disk circle wire temperature is less than or equal to 700 DEG C when, detain stay-warm case slow cooling；
S50, aligning；
S55, polishing；
S60, flaw detection；
S65, cleaning, inspection；
S70, submit, to rolling after disk round wires material, after being tested by bundle sampling, submit.
The present invention has the advantages that：The bearing steel of the present invention is than traditional GCr15 steel ratio, and chemical composition has substantially not Together, carbon content is reduced, micro alloying element is added：Ni, Mo, Cu, cerium, five kinds of elements of aluminium so that its technology quality index It is significantly improved than traditional GCr15 steel, service life is doubled.
Embodiment
Technical scheme is further elaborated with reference to embodiment.
Embodiment 1
Present embodiments providing a kind of high life, (life-span that XWLNXP001 high life bearing is used for rolling mill guiding bearing can To reach 10-12 hours, with former GCr15 rolling mill guidings bearing life 4-6 time ratios, it is doubled) bearing steel, its each component Percentage is：
C：0.75~0.85%；
Si：0.15~0.35%；
Mn：0.25~0.40%；
Cr：1.40~1.60%；
Ni：0.05~0.09%；
Mo：0.02~0.08%；
Al：0.005~0.020%；
Cu：0.02~0.08%；
Ce (cerium)：0.005~0.03%；
P：Less than or equal to 0.010%；
S：Less than or equal to 0.008%；
Ti：Less than or equal to 0.0020%；
O：Less than or equal to 0.0008%；
As：Less than or equal to 0.012%；
Sn：Less than or equal to 0.002%；
Sb：Less than or equal to 0.0050%；
Pb：Less than or equal to 0.0020%；
Ca：Little Yu Deng Yu≤0.0010%；
Surplus is Fe.
Corrosion-resistant, wear-resisting, antifatigue element is determined：
The element that the bearing steel of the present embodiment is corrosion-resistant, wear-resisting, antifatigue is determined as shown in table 1.
High life bearing steel material composition design key is to ensure to obtain high elastic limit, tensile strength and contact tired Labor intensity, high hardenability and necessary quenching degree, to ensure high-wearing feature, certain impact flexibility；Good dimensionally stable Property or structure stability；Chemical attack can be resisted；Fatigue of materials peeling, stuck, lasso fracture, abrasion, corrosion can effectively be reduced Etc. phenomenon.
The control interval of carbon component：Carbon is to influence the important element of steel performance, is to ensure that bearing steel can possess enough Quenching degree, one of the important element of hardness number and wearability.Carbon invigoration effect is very high, in steel phosphorus content increase, yield point and Tensile strength is raised, but significantly reduces toughness, in order to improve the safety and reliability that bearing steel is used, in the same of reduction carbon When, intensity is improved by alloying, i.e., by 0.95~1.05% (weight) in existing GCr15, it is designed to 0.75~ 0.85% (weight), it is highly preferred that can control the content of the carbon in 0.76~0.80% (weight), by lower limit control System, reduces strand carbon segregation, improves the uniformity of carbide.
Mn, Cr, Ni, Mo, Al, Ce elements specification：Chromium is carbide former, and main function is to improve steel Quenching degree and decay resistance, and intensity, hardness, wearability, elastic limit and yield limit can be improved.Steel can be significantly changed The distribution of carbide and its size of particle are planted, makes the tendency of cementite carbide size (FeCr) 3C annealing aggregations containing chromium Property diminish, be that bearing steel carbide becomes the tiny, temperature range that is evenly distributed and expands spheroidizing.Chromium can also subtract The overheat tendency and skin decarburization speed of small steel.Cr is by 1.40~1.60% designs, it is highly preferred that can be by the content of the chromium Control is 1.50~1.55%, by increasing capacitance it is possible to increase the quenching degree and wearability of steel, improves dimensional stability or structure stability, can change The resistance to corrosion and antioxidation of kind steel；And can prevent too high chromium content from easily forming bulk carbide.
Manganese significantly improves the quenching degree of steel, and part manganese, which is dissolved in ferrite, improves ferritic hardness and intensity, and energy Enough fix steel grade S form and form the small MnS sulfides of the performance hazards to steel, can reduce or suppress FeS life Into.Mn can improve the intensity of steel, weaken and eliminate the harmful effect of sulphur, improve and melt invigoration effect admittedly, and can improve quenching for steel Mn content is designed as 0.25~0.40% (weight by permeability, yield strength and tensile strength, the bearing steel of embodiment as needed Amount), can be 0.35~0.40% by Mn content control, to ensure bearing steel in the present embodiment by middle upper limit control composition Retained austenite quantity, superheated susceptivity, crack tendence and the dimensional stability of stabilized steel.But these yuan of Cr and Mn in steel Element can make material while increasing temper brittleness sensitiveness, i.e. brittle transition temperature and rising for 250~450 DEG C, Ductile rupture Impact value and Fracture Toughness decline, in order to reduce the adverse effect of manganese, and this is accomplished by increasing Mo elements, and its content range is 0.02~0.05% (weight), improves quenching degree, anti-temper resistance, refines annealed structure, reduces quenching distortion, improves fatigue Intensity, improves mechanical property.
Ni contents are designed as 0.05~0.09% (weight), and Ni is to improve the maximally effective alloying element of steel toughness, and it is tough The mechanism of change is material matrix is easy to cross-slip at low temperature in itself, no matter to which kind of tissue, adding Ni can improve tough Property.The control interval 0.15-0.19% of Ni+Mo+Cu elements design simultaneously, can obtain comprehensive corrosion resisting property more more preferable than Cu+Ni, So Cu is designed by 0.02-0.08%, the corrosion-resistant stability enhancing of steel.
Al content is designed as 0.005-0.020%, can avoid steel because grain size Coarsening Temperature is low, open grain structure quality Problem, makes to be formed the infusible compound-AlN of enough small and dispersed distributions in steel, and tiny, disperse carbon, nitride V (C, N Austenite Grain Growth) is prevented together, and grain size number can bring up to >=8.5 grades, than GCr15 under GB/T18254-2002 Grain size improves 0.5 rank.
Cerium is designed according to 0.005-0.030%, makes the field trash remained in steel by cerium nodularization, refinement is brilliant Grain, improves the service life of bearing steel.
The bearing steel of the present embodiment can make its comprehensive mechanical performance be increased than former GCr15 steel, be carbonized especially in steel Thing (netted etc.) rank is significantly reduced, so that the need for meeting bearing steel in terms of high life, the high reliability.
The bearing steel of the present embodiment adds Ni, Mo, Cu, Ce elements on the basis of traditional bearing steel GCr15 materials, Reduce carbon content, at the same strictly control Al content scope, and by converter or electric furnace+LF+VD or RH+ molding or continuous casting → plus Heat → rolling → slow cooling → finishing → reheating → secondary rolling → slow cooling → finishing cleaning → flaw detection → cleaning, inspection → on Prepared by the method for friendship, so that bearing steel can reach following performance requirement：
(1) high elastic limit, tensile strength and contact fatigue strength；
(2) high hardenability and necessary quenching degree, to ensure high-wearing feature, its hardness is (HRC) 62~64；
(3) higher impact flexibility；
(4) good dimensional stability or structure stability；
(5) chemical attack can be resisted, it is anti-oxidant；
(6) phenomenons such as fatigue of materials peeling, stuck, lasso fracture, abrasion, corrosion can effectively be reduced.
And the performance indications such as macrostructure, non-metallic inclusion, the distribution of carbides of material is entirely reached design and is referred to Mark.
GB/T18254-2002 is pressed in the bearing steel of the present embodiment, macrostructure center porosity, General Loosen and segregation respectively 1st, the 2nd and 3rd level do not scheme grading, all should be not more than 1.0 grades, be not allow for general freckle type segregation and edge is mottled partially Analysis.
In terms of non-metallic inclusion：(1) conventional non-metallic field trash presses the rank figure of GB/T18254-2002 appendix As the 4th Evaluated, DS is evaluated by ISO 4967, evaluation result should meet table 1 and provide.
The qualified rank of the non-metallic inclusion of table 1
(2) non-metallic inclusion TiN criterion：
1. form：Square or squarish, corner or sharp-featured individual particle field trash.
2. the TiN field trashes for 2 length of side ＜, 19 μm or 1 length of side >=19 μm occur are not allowed in a visual field.
In terms of carbide inhomogeneities：(1) carbide strip, is entered by the rank figure of GB/T 18254-2002 appendix As the 8th Row evaluation, its qualified rank is not more than 2.0.(2) carbide liquid-extraction, is carried out by the rank figure of GB/T 18254-2002 appendix As the 9th Evaluation, its qualified rank is not more than 1.0.
The research and development of the bearing steel of the present embodiment and the direction that production is domestic and international bearing steel development, can accelerate to shorten me State's bearing steel kind in kind, quality and external gap, the country is realized after industrialization, and import can be substituted to a certain extent, It is mainly used in the fields such as each famous brand name car motor machine bearing, military project and precision optical machinery bearing, there are fabulous market prospects.
Embodiment 2
A kind of production method of high life bearing steel is present embodiments provided, it includes：
S10, converter or electric furnace+LF+VD or RH tappings, ingot casting or continuous casting：
S15, heating；3-7 tons of steel ingots or Ф 310-500mm continuous casting billets are put into heating furnace and heated, soak temperature 1220-1250 DEG C, the High temperature diffusion time is more than 6 hours, rolling of coming out of the stove.
S20, rolling；3-7 tons of steel ingots or Ф 310mm continuous casting billets are hung out into heating furnace, 1200-1220 DEG C of start rolling temperature is whole 850-900 DEG C of temperature is rolled, 160mm is rolled into2Enter to cheat slow cooling.
S25, slow cooling；160mm after rolling2Strip plate enters to cheat slow cooling 60 hours, further expands hydrogen and removes residual stress ,≤ 200 DEG C go out hole.
S30, finishing；160mm after rolling2Strip plate surface strips off the skin cleaning through emery wheel, removes decarburized layer.
S35, reheating；By 160mm2Strip plate is put into heating stove heat, and 1160~1200 DEG C of heating-up temperature, soaking zone is protected Warm 1160-1180 DEG C of holding temperature, soaking time is more than 110 minutes；Total heat time is more than 330 minutes.
S40, secondary rolling；With the 160mm after heating2Strip plate, is rolled into Ф 5.5mm, Ф 7mm, Ф 14mm disk round wires materials.
S45, slow cooling；It is rolled into after Ф 5.5mm, Ф 7mm, Ф 14mm disk round wires materials, during disk circle wire temperature≤700 DEG C, Detain stay-warm case slow cooling.
S50, aligning；
S55, polishing；
S60, flaw detection；
S65, cleaning, inspection；
S70, submit to rolling after disk round wires material, by bundle sampling test after, submit.
Wherein, before cogging 1220-1250 DEG C of steel ingot or continuous casting billet high temperature homogenization holding temperature, the High temperature diffusion time is big In 6 hours, slow cooling 60 hours after rolling；1160~1200 DEG C of heating-up temperature before secondary wire rod rolling, soaking zone insulation insulation 1160-1180 DEG C of temperature, soaking time is more than 110 minutes；Total heat time is more than 330 minutes.
The high life bearing steel (XWLNXP002) of the present invention, what is obtained by nodularization isothermal annealing is globular pearlite group Knit, cementite therein is in spherical particle, Dispersed precipitate is lower than not only hardness with lamellar pearlite on ferrite matrix, just In machining, and in Quench heating, austenite crystal is difficult to grow up, and workpiece is not easy to deform and ftractureed during cooling.
GCr15 materials as defined in the leading indicator apparently higher than GB/T 18245-2002 of the high life bearing steel of the present invention Standard, leading indicator contrast is as shown in table 2.
The present embodiment bearing steel of table 2 is contrasted with GCr15 materials leading indicator as defined in GB/T 18245-2002
Embodiment 3
The bearing steel of the present embodiment, in test selected scheme and technique effect are as shown in table 3：
Technical scheme selected in the experiment of table 3
According to mentioned component, the C curve for measuring bearing steel is as shown in table 4：
The C curve of the bearing steel of table 4
Transformation temperature T liquid Ac1(Ar1) Ac3(Ar3) Ms
Temperature 1458 762℃(698℃) 902℃(712℃) 171
Its performance is tested, quantity of sampling quantity, sampling point and the method for inspection are detailed such as table 5 below.
The quantity of sampling quantity of table 5, sampling point and the method for inspection
With reference to 1458 DEG C of the liquidus temperature of the bearing steel of the present embodiment, it is allowed to heating-up temperature be up to 1258 DEG C.Cause Lower than fusing point 50~100 DEG C for the burnt temperature of steel, overtemperature is lower than fusing point 150~200 DEG C, so the heating and thermal insulation of steel is most High-temperature should typically be less than 200 DEG C of fusing point (or less than state diagram solidus temperature).
Therefore, the steel ingot or continuous casting billet of bearing steel must be controlled in 1220-1250 DEG C of temperature model through high temperature homogenization temperature Within enclosing, soaking time 6-8 hours carries out cheating cold after rolling, prevents billet surface crackle.Roll rear removing surface.
GCr15 materials contrast chemical composition has substantial under the conditions of the bearing steel and GB/T18254-2002 of the present embodiment Difference, adds the elements such as Ni, Mo, Cu, cerium, while having carried out specifications design to Al content, steel combination property, which has, significantly to be carried Height, testing result is as follows：
(1) macrostructure is to such as table 6；
The macrostructure situation of table 6；
(2) level of inclusions is to such as table 7；
The non-metallic inclusion of table 7 contrasts situation
(3) distribution of carbides is to such as table 8；
The distribution of carbides situation of table 8 is contrasted
For ease of description, the quality of embodiment is not only represented for the sequencing of above example.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic； And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and Scope.

Claims (5)

1. a kind of bearing steel, it is characterised in that its each component percentage is：
C：0.75~0.85%；
Si：0.15~0.35%；
Mn：0.25~0.40%；
Cr：1.40~1.60%；
Ni：0.05~0.09%；
Mo：0.02~0.08%；
Al：0.005~0.020%；
Cu：0.02~0.08%；
Ce：0.005~0.03%；
P：Less than or equal to 0.010%；
S：Less than or equal to 0.008%；
Ti：Less than or equal to 0.0020%；
O：Less than or equal to 0.0008%；
As：Less than or equal to 0.012%；
Sn：Less than or equal to 0.002%；
Sb：Less than or equal to 0.0050%；
Pb：Less than or equal to 0.0020%；
Ca：Little Yu Deng Yu≤0.0010%；
Surplus is Fe.
2. bearing steel according to claim 1, is characterised by,
The percentage by weight of the C is 0.76-0.80%.
3. bearing steel according to claim 2, is characterised by,
The percentage by weight of the Cr is 1.50-1.55%.
4. bearing steel according to claim 3, is characterised by,
The percentage by weight of the Mn is 0.35-0.40%.
5. a kind of preparation method of bearing steel, it is characterised in that comprise the following steps：
S10, by comprising element as claimed in claim 1 and content bearing steel tap, steel ingot is obtained by ingot casting or continuous casting Or continuous casting billet；
S15, heating；3-7 tons of steel ingots or Ф 310-500mm continuous casting billets are put into heating furnace and are heated to 1220-1250 DEG C, insulation Time is more than 6 hours, rolling of coming out of the stove；
S20, rolling；3-7 tons of steel ingots or Ф 310mm continuous casting billets are hung out into heating furnace, 1200-1220 DEG C of start rolling temperature, finish to gauge temperature 850-900 DEG C of degree, is rolled into 160mm2Strip plate enters to cheat slow cooling；
S25, slow cooling；160mm after rolling2Strip plate enters to cheat slow cooling 60 hours；Go out hole when strip plate temperature is less than or equal to 200 DEG C；
S30, finishing；160mm after rolling2Strip plate surface strips off the skin cleaning through emery wheel, removes decarburized layer；
S35, reheating；By 160mm2Strip plate be put into heating stove heat, be heated to 1160~1200 DEG C, soaking zone insulation is protected 1160-1180 DEG C of temperature, soaking time is more than 110 minutes；The time sum of the heating and reheating is more than 330 points Clock；
S40, secondary rolling；With the 160mm after heating2Strip plate, is rolled into Ф 5.5mm, Ф 7mm, Ф 14mm disk round wires materials；
S45, slow cooling；It is rolled into after Ф 5.5mm, Ф 7mm, Ф 14mm disk round wires materials, disk circle wire temperature is less than or equal to 700 DEG C When, detain stay-warm case slow cooling；
S50, aligning；
S55, polishing；
S60, flaw detection；
S65, cleaning, inspection；
S70, submit, to rolling after disk round wires material, after being tested by bundle sampling, submit.
CN201710232803.3A 2017-04-11 2017-04-11 Bearing steel and preparation method thereof Pending CN107119239A (en)

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CN107904497A (en) * 2017-12-13 2018-04-13 西王金属科技有限公司 A kind of high life bearing steel and its manufacture method
CN108176718A (en) * 2017-12-05 2018-06-19 山东钢铁股份有限公司 A kind of milling method of hypereutectoid steel continuous casting billet
WO2018188008A1 (en) * 2017-04-13 2018-10-18 龙南日升昌新材料研发有限公司 Bearing steel and preparation method therefor
CN115558867A (en) * 2022-11-08 2023-01-03 北京科技大学烟台工业技术研究院 Chlorine ion corrosion resistant rare earth microalloyed high-carbon chromium bearing steel

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CN103261450A (en) * 2010-12-13 2013-08-21 新日铁住金株式会社 High-carbon chromium bearing steel, and process for production thereof
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WO2018188008A1 (en) * 2017-04-13 2018-10-18 龙南日升昌新材料研发有限公司 Bearing steel and preparation method therefor
CN108176718A (en) * 2017-12-05 2018-06-19 山东钢铁股份有限公司 A kind of milling method of hypereutectoid steel continuous casting billet
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CN115558867A (en) * 2022-11-08 2023-01-03 北京科技大学烟台工业技术研究院 Chlorine ion corrosion resistant rare earth microalloyed high-carbon chromium bearing steel
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