CN108929997A - A kind of automotive hub bearing steel and its manufacturing method - Google Patents

A kind of automotive hub bearing steel and its manufacturing method Download PDF

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Publication number
CN108929997A
CN108929997A CN201710383386.2A CN201710383386A CN108929997A CN 108929997 A CN108929997 A CN 108929997A CN 201710383386 A CN201710383386 A CN 201710383386A CN 108929997 A CN108929997 A CN 108929997A
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hub bearing
bearing steel
steel
automobile hub
manufacturing
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CN108929997B (en
Inventor
刘湘江
万根节
黄宗泽
马强
韩纪鹏
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Priority to CN201710383386.2A priority Critical patent/CN108929997B/en
Priority to KR1020197035801A priority patent/KR102314171B1/en
Priority to JP2019565185A priority patent/JP6862578B2/en
Priority to DE112018002705.8T priority patent/DE112018002705T5/en
Priority to PCT/CN2018/087792 priority patent/WO2018214863A1/en
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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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium

Abstract

A kind of automobile hub bearing steel and its manufacturing method, chemical component weight percentage are：Carbon：0.58~0.61%；Silicon≤0.15%；Manganese：0.87~0.95%；Copper：0.10~0.25%；Molybdenum：0.12~0.18%；Chromium：0.10~0.20%；Sulphur≤0.015%；Phosphorus≤0.015%；Aluminium：0.008~0.015%；Oxygen≤0.0006%；Nitrogen：0.006~0.015%；Hydrogen≤0.0001%；Titanium≤0.0015%；Remaining is iron and inevitable impurity, and, meet simultaneously, C%+Mn%/3=0.87~0.95, Al/N=0.85~1.15.Bearing steel of the present invention has the characteristics that corrosion-resistant, crystal grain is tiny, clarity is high, obdurability function admirable；The tensile strength of bearing steel, 800~900MPa can guarantee that the hardness of high-frequency quenching roller surface reaches 730~780HV, and the depth of hardening zone of roller surface reaches 2.0~3.5mm.

Description

A kind of automotive hub bearing steel and its manufacturing method
Technical field
The present invention relates to bearing steel, a kind of automotive hub bearing steel and its manufacturing method are referred in particular to.
Background technique
The effect of automobile hub bearing is support car body and guidance wheel rotation, it had not only born axial load but also had born radial direction Load.As the use scope and usage amount of automobile hub bearing are growing, the third generation has nowadays been had evolved to, the A generation is made of double row angular contact bearing；The second generation has a flange for fixing bearing in outer rollaway nest, can be simple Bearing is set on wheel shaft and is secured with nuts；Third generation hub-bearing unit is to use bearing unit and anti-brake holding system ABS is matched.Hub unit has been designed to that inner flange and outward flange, inner flange are fixed by bolts in drive shaft, and outward flange will Entire bearing is installed together.The appearance of third generation hub bearing is so that the installation and maintenance of hub bearing are more convenient, to wheel The performance requirement of hub bearing steel is also higher and higher.
The generally middle carbon bearing steel of bearing steel for manufacturing automobile hub bearing, such as uses S55C, chemical component is： C:0.52~0.58%, Si:0.15~0.35%, Mn:0.60~0.90%, Cr≤0.20%, P≤0.030%, S≤ 0.035%, Ni≤0.20%, Cu≤0.30%, Ni+Cr≤0.35%.
With the development of forging technology, automotive hub blank is by conventional heating stove heating (heat medium：Natural gas or coal Gas)+free_forging production technology develop to multistation high-speed upsetter forging press carry out bearing ferrule blanks hot forging production technology.
For new high speed upsetting using Medium Frequency Induction Heating Furnace heating and tower forging process, tower forging process is to grind single-piece to expand Then jumping-up carries out tower forging, then by being separated into outer ring and inner ring, expansion is ground in outer ring, inner ring punching is walked haltingly.Using new high speed upsetting There is forging process high high production efficiency, dimensional accuracy, material lumber recovery height, metal streamline to be distributed, crystal grain refinement, improve gold The interior tissue of category, however the bearing steel material of automotive hub is required more stringent.Further, by certain joint automobile product The parsing that board market returns to wheel hub defective products is classified display, and common hub bearing failure mode has 5 kinds, including fatigue failure, Abrasion, burn into galvanic corrosion, plastic deformation, crackle.Therefore, hub bearing steel must have tiny crystal grain, uniform hardness, corrosion resistant Corrosion energy, high degree of purity (including non-metallic inclusion, residual elements and gas), in addition, should also have good upsetting The high-frequency quenching of performance and die life, especially later process will not only obtain the hardness of 730~780HV of roller surface, simultaneously It it is also desirable to have certain through hardening layer depth.
Chinese Patent Application No. 200710045281.2 and Chinese Patent Application No. 201610001624.4 are for automobile The bearing steel patent of invention of wheel hub.Chinese Patent Application No. 200710045281.2 is the middle carbon optimized on the basis of S55C Carbon bearing steel reduces the range of carbon content to obtain lesser roller surface difference of hardness, is refining grain size and reduction Al2O3 type field trash is defined Al content, while controlling harmful element Ti.Number of patent application 201610001624.4 be a kind of microalloy car carbon hub bearing steel, and main addition Al member is usually thin other than limiting purposes Change crystal grain.
It tends not to reach corresponding fine grain effect to refine crystal grain however, Al is added merely；Existing automotive wheels hub axle Steel is held due to the relatively low hardness that not can effectively improve hub bearing roller surface of carbon content, for corresponding hub bearing steel bar, The excessive hardness deviation > 50HV for causing hub bearing roller surface of the carbon deviation at center and edge；Existing hub bearing steel is pure Degree control is bad, and especially oxygen content, Ti content height cause single spherical oxide and titanium nitride type field trash is more than 27 μm, The early stage of hub bearing roller surface is caused to peel off and fail.
Summary of the invention
The purpose of the present invention is to provide a kind of automobile hub bearing steel and its manufacturing method, which has corrosion resistant Erosion, the features such as crystal grain is tiny, clarity is high, obdurability function admirable；The automobile hub bearing steel tensile strength 800~ 900MPa can guarantee that the hardness of high-frequency quenching roller surface reaches 730~780HV, the depth of hardening zone of roller surface reaches 2.0~ 3.5mm。
In order to achieve the above objectives, the technical scheme is that：
Hardness requirement after automobile hub bearing roller surface high-frequency quenching is 730~780HV, the depth of hardening zone of roller surface Reach 2.0~3.5mm (not including milled portion), hardness deviation≤50HV.The above technical indicator is stably reached, needs to control The uniformity of depth of hardening zone and tissue.Ingredient design main alloy element C and Mn need Proper Match (to consider depth of hardening zone And wear-resisting property), while increasing harden ability elements Mo, control AlN controls the purpose suppression of Al and N element in crystal boundary disperse educt Al is also prevented when combinations grain length Datong District2O3Occur with TiN type field trash.Add the alloy design of Mn and Cu element also For the corrosion resistance of hub bearing, prevent local spot corrosion from causing the peeling of working face.In terms of crystallite dimension refinement Design further includes selection addition Nb element, and the subgrain refinement of cooperation wheel hub forging process can finally obtain the tiny group of crystal grain It knits.
Specifically, a kind of automobile hub bearing steel of the invention, chemical component weight percentage are：Carbon：0.58~ 0.61%；Silicon≤0.15%；Manganese：0.87~0.95%；Copper：0.10~0.25%；Molybdenum：0.12~0.18%；Chromium：0.10~ 0.20%；Sulphur≤0.015%；Phosphorus≤0.015%；Aluminium：0.008~0.015%；Oxygen≤0.0006%；Nitrogen：0.006~ 0.015%；Hydrogen≤0.0001%；Titanium≤0.0015%；Remaining is iron and inevitable impurity, and, meet simultaneously, C%+ Mn%/3=0.87~0.95, Al/N=0.85~1.15.
It further, further include niobium：0.020~0.040%.
Also, the impurity includes：Pb≤0.002%, As≤0.04%, Sn≤0.005%, Sb≤0.004% or Ca≤ 0.0010%.
In the ingredient design of steel of the present invention：
Carbon：Carbon deteriorates toughness, however, carbon is the important element for guaranteeing bearing hardness of steel and wear-resisting property, In order to guarantee that the hardness of high-frequency quenching roller surface reaches 730~780HV, the hardened depth of roller surface in automobile hub bearing steel Degree reaches 2.0~3.5mm, it is necessary to control 0.58~0.61% carbon content.
Silicon：Silicon can be dissolved in the hardness and strength that steel is improved in ferrite and austenite, but the higher silicon energy in this steel grade Ferrite crystal grain is promoted to be roughened.Silicon control is ≤0.15% in steel of the present invention.
Manganese：Manganese partially can replace chromium to keep intensity, and manganese is the essential element that can significantly improve harden ability.But manganese There is the shortcomings that promoting austenitizing crystal grain to grow up in steel, the content of manganese should be controlled.In steel of the present invention, add in invention steel Manganese addition content is 0.87~0.95% and cooperates with carbon, guarantee the hardness of high-frequency quenching roller surface reach 730~ The depth of hardening zone of 780HV, roller surface reach the essential element of 2.0~3.5mm.
Mn and Fe forms solid solution, while improving the intensity of ferrite and austenite；Mn makes even tissue weak carbide shape At element, replace a part of Fe atom into cementite.In addition, Mn is also improved wearability effect.Therefore, by calculating phase The research of tissue and experiment, the control of Mn content 0.87~0.95% and can played with the cooperation of other elements and play phase in invention The effect answered.
Chromium：Chromium can significantly improve intensity, hardness and wearability, but reduce plasticity and toughness simultaneously.Chromium can improve steel again Inoxidizability and corrosion resistance add chromium 0.10~0.20% in invention steel.
Aluminium：Aluminium be deoxidier and refinement crystal grain element, but experiments have shown that, excessive Al often will form Al2O3Class is nonmetallic The non-metallic inclusion of field trash, these hardly possible deformations often becomes fatigue fracture source, influences the shock resistance of bearing.This steel Control finished product 0.010~0.015% in kind is significant technical characteristic.
Niobium：The niobium of typical refinement crystal grain element, choosing plus 0.020-0.040% can improve the crystallite dimension of steel, obtain Good toughness.But excessive niobium often will cause corresponding carbide aggregation, cause the reduction of toughness.
Nitrogen：Nitrogen is the important alloying element of steel of the present invention, and aluminium and nitrogen form AlN, niobium and nitrogen and forms the refinement such as NbCN The crystallite dimension of 7~9 grades of acquisition is precipitated in crystal boundary for crystal grain element, and Control of Nitrogen Content is 0.0060~0.015%.
Copper：Copper is generally as control of deleterious element, because being to be easy to produce hot-short, spy in hot-working the shortcomings that copper Be not copper content be more than 0.5% plasticity significantly reduce.Due to smelting the difference of mode, electric arc furnace smelting (raw material is based on steel scrap) Often copper content is not necessarily to Special controlling 0.10~0.20%, and converter smelting (raw material is based on blast-melted) copper content is general Additional addition copper alloy is needed less than 0.05%.0.10~0.25% is added in steel of the present invention, can improve intensity and toughness, especially It is to improve atmospheric corrosion performance.Experiment by the more rounds in laboratory shows that 0.10~0.25% copper can effectively improve vapour The corrosion resistance of wheel hub bearing especially reduces the spot corrosion of atmosphere, and the surface for reducing bearing is peeled off.
Molybdenum：Molybdenum element can make the crystal grain refinement of steel, improve harden ability, furthermore can also improve mechanical performance.It can also inhibit Steel alloy brittleness due to caused by fire.Reach 2.0~3.5mm to control the depth of hardening zone of roller surface, is controlled in the present invention 0.12~0.18% molybdenum can play the role of corresponding.
Phosphorus, sulphur, titanium：Impurity element in steel can significantly reduce the plasticity and toughness of steel.Especially phosphorus, titanium harm are maximum, Sulphur≤0.015%, phosphorus≤0.010%, titanium≤0.0015%.Lead, antimony, bismuth, oxygen are the impurity elements in steel simultaneously, in technology item Part should reduce its content in the case of allowing as far as possible.
The manufacturing method of automobile hub bearing steel of the present invention, characterized in that include the following steps：
1) it smelts, cast
By mentioned component using electric arc furnaces or converter smelting, ladle refining, continuous casting at slab；
2) it rolls
Slab heating, 600~900 DEG C of furnace temp, slab enters furnace and keeps the temperature 20~40 minutes；By 120 minutes~200 Minute is warming up to 1180~1220 DEG C, keeps the temperature 80~180 minutes；
Blooming mill rolling, by slab rolling-cogging at billet；
Billet is rolling to bar by pair rolling：
1160~1200 DEG C of billet heating temperature, heating time 80 minutes~120 minutes；It is conventional
Rolling controls 760~900 DEG C of finishing temperature.
Preferably, in the ladle refining：Low alkalinity synthetic slag 1.5~3kg/t molten steel is added in external refining furnace ladle, Slag making, using Al progress precipitation desoxydations, Si-C powder carries out top of the slag deoxidation, at interval of a batch of addition in 15 minutes, adds 2~3 batches, often Criticize additional amount 0.2-0.8kg/t molten steel；External refining furnace control top basicity of slag 2~4.
Preferably, the external refining uses low alkalinity synthetic slag, and synthetic slag composition by weight percent is：CaO 51~ 53%, MgO 15~19%, Al2O35~11%, SiO222~24%, P2O5≤ 0.10%, S≤0.05%, H2O≤ 0.6%, CaO/SiO22.08~2.44；5~20mm of synthetic slag granularity.
Preferably, into before vacuum outgas, 1580~1610 DEG C of liquid steel temperature；Chromium nitride silk is fed before vacuum outgas, adjusts nitrogen 60~150ppm of content, feeding precision mend aluminium to 0.015~0.025%.
Preferably, after vacuum refining, ladle is 40 minutes calm or more, soft blow Ar, molten steel is using continuous casting, control The degree of superheat≤35 DEG C improve the segregation of steel using solidification end slighter compress and electromagnetic agitating technology.
Biggish load is born in hub bearing work, to field trash quite sensitive indeformable in hub bearing steel, is smelted In the process other than the residual elements such as control O, Ti, S, P, H must be decreased to certain content once, it is necessary to control single Indeformable globular inclusion, especially full-size are no more than 27 μm.The refinery practice and essence of design personalized of the present invention Slag system is refined, the inclusion size and quantity of difficult deformation are controlled.
Beneficial effects of the present invention：
1, the present invention in steel by being added the alloying elements such as silicon, manganese, molybdenum, copper, nitrogen and carrying out corresponding ingredient design.Vapour Wheel hub bearing steel uses single inclusion size of the effective control oxide of low alkalinity refining with synthetic flux and titanium nitride type；It adopts Segregation is effectively improved with process means such as slighter compress and electromagnetic agitations.
2, automobile hub bearing steel is suitble to newest high speed upsetting, can guarantee that the hardness of high-frequency quenching roller surface reaches 730~780HV, the depth of hardening zone of roller surface reach 2.0~3.5mm, tensile strength, 800~900MPa.
3,7~9 grades of automobile hub bearing crystalline grain of steel degree.
4, automobile hub bearing steel degree of purity is high：Single size of maximum inclusion≤27 μm, oxygen content≤6ppm, Ti content ≤ 0.0015%.
Specific embodiment
Below with reference to embodiment, the present invention will be further described.
Steel embodiment ingredient of the present invention is by table 1, table 2, and the performance parameter of embodiment steel is referring to table 3.
Preparation method of the present invention uses two-step process：The first step：Electric arc furnaces (or converter) just refining → ladle furnace vacuum fine Refining → casting slab；Second step：Rolling mill hot-working rolling is become a useful person.
The first step carries out refining at the beginning of molten steel in 150 tons of electric arc furnaces；The ladle refining of corresponding tonnage；Continuous casting；Production Chemical component meets defined 320mm × 425mm square billet out.
1. just furnace：First furnace is electric arc furnaces.First furnace tapping molten steel reaches：[P]≤0.015%, [C] >=0.10%, T >=1630 DEG C start to tap, and suitable synthetic slag is added in the tapping later period.Aluflex is added when tapping in ladle, and (amount containing Al is 22%), Mn is added to the upper limit in product composition by 100% rate of recovery.
2. ladle refining furnace：The 2kg/t slag making of low alkalinity synthetic slag is added in ladle for external refining furnace (LF) heating station, Using Al progress precipitation desoxydations, Si-C powder carries out top of the slag deoxidation, according to silicone content situation adjustment additional amount in slag condition and steel and Batch is added, generally at interval of a batch of addition in 15 minutes, dosage 0.2-0.8kg/t makes refining process remain that deoxidation is good It is good.
Low basicity slag, control refining furnace roof basicity of slag 3-4 are adjusted at LF initial stage.
Chromium nitride silk (adjustment nitrogen content 60-150ppm) is fed before vacuum outgas, feeding precision mends aluminium to 0.015~0.025%； 1580~1610 DEG C of molten steel temperature before into vacuum outgas, vacuum outgas control rough vacuum (≤0.3kPa) and retention time 15min；1530~1560 DEG C of temperature after vacuum.
3. being poured：After vacuum refining, ladle is 40 minutes calm or more, (Ar pressure flow is pico- with liquid level by soft blow Ar Trembling is advisable).Molten steel controls the degree of superheat≤35 DEG C using continuous casting, is improved using end slighter compress and electromagnetic agitating technology The segregation of steel.
Second step：Blank hot is sent into 860 DEG C of heating furnace charging temperature and keeps the temperature 35 minutes；1260 were warming up to by 160 minutes ~1280 DEG C；Heat preservation 160 minutes；Blooming mill routinely rolling mill practice, blooming mill by qualified steel ingot rolling-cogging at 200mm × 200mm billet；Steel billet is transferred to 1140 DEG C of rolling mill heating furnace heating temperature, and heating time 130 minutes；Finishing temperature 835 ℃。
Implement automobile hub bearing steel shaft produced by the invention and hold steel bar to be processed into automobile hub bearing, through certain foreign capitals vapour Che company is assembled to certain well-known vehicle, meets requirement by testing properties, the service life is better than carbon in the tradition such as S55C Bearing steel.

Claims (10)

1. a kind of automobile hub bearing steel, chemical component weight percentage are：
Carbon：0.58~0.61%；
Silicon：≤ 0.15%；
Manganese：0.87~0.95%；
Copper：0.10~0.25%；
Molybdenum：0.12~0.18%；
Chromium：0.10~0.20%；
Sulphur：≤ 0.015%；
Phosphorus：≤ 0.015%；
Aluminium：0.008~0.015%；
Oxygen：≤ 0.0006%；
Nitrogen：0.006~0.015%；
Hydrogen：≤ 0.0001%；
Titanium：≤ 0.0015%；
Remaining is iron and inevitable impurity, and, meet simultaneously, C%+Mn%/3=0.87~0.95, Al/N=0.85~ 1.15。
2. automobile hub bearing steel as described in claim 1, characterized in that further include niobium：0.020~0.040%.
3. automobile hub bearing steel as claimed in claim 1 or 2, characterized in that the impurity includes：Pb≤0.002%, As ≤ 0.04%, Sn≤0.005%, Sb≤0.004% or Ca≤0.0010%.
4. the automobile hub bearing steel as described in claims 1 or 2 or 3, characterized in that the automobile hub bearing steel tension is strong Degree, 800~900MPa can guarantee that the hardness of high-frequency quenching roller surface reaches 730~780HV, and the depth of hardening zone of roller surface reaches To 2.0~3.5mm.
5. the manufacturing method of automobile hub bearing steel as claimed in claim 1 or 2, characterized in that include the following steps：
1) it smelts, cast
Ingredient as described in claim 1 or 2 is using electric arc furnaces or converter smelting, ladle refining, continuous casting at slab；
2) it rolls
Slab heating, 600~900 DEG C of furnace temp, slab enters furnace and keeps the temperature 20~40 minutes；It heated up by 120~200 minutes To 1180~1220 DEG C, 80~180 minutes are kept the temperature；
Blooming mill rolling, by slab rolling-cogging at billet；
Billet is rolling to bar by pair rolling：
1160~1200 DEG C of billet heating temperature, heating time 80~120 minutes；Pair rolling, control finishing temperature 760~ 900℃。
6. the manufacturing method of automobile hub bearing steel as claimed in claim 5, characterized in that in the ladle refining：Outside furnace Be added low alkalinity synthetic slag 1.5~3kg/t molten steel in refining furnace ladle, slag making, using Al progress precipitation desoxydations, Si-C powder into Row top of the slag deoxidation adds 2~3 batches, every batch of additional amount 0.2-0.8kg/t molten steel at interval of a batch of addition in 15 minutes；External refining furnace Control top basicity of slag 2~4.
7. the manufacturing method of automobile hub bearing steel as claimed in claim 5, characterized in that the external refining uses low alkali Synthetic slag is spent, synthetic slag composition by weight percent is：CaO 51~53%, MgO 15~19%, Al2O35~11%, SiO2 22~24%, P2O5≤ 0.10%, S≤0.05%, H2O≤0.6%, CaO/SiO22.08~2.44；Synthetic slag granularity 5~ 20mm。
8. the manufacturing method of automobile hub bearing steel as claimed in claim 5, characterized in that into before vacuum outgas, molten steel temperature 1580~1610 DEG C of degree；Hello chromium nitride silk before vacuum outgas, adjustment 60~150ppm of nitrogen content, feeding precision benefit aluminium to 0.015~ 0.025%.
9. the manufacturing method of automobile hub bearing steel as claimed in claim 5, characterized in that after vacuum refining, ladle Calm 40 minutes or more, soft blow Ar, molten steel controlled the degree of superheat≤35 DEG C using continuous casting, using solidification end slighter compress and The segregation of electromagnetic agitating technology improvement steel.
10. the manufacturing method of automobile hub bearing steel as claimed in claim 5, characterized in that the automobile hub bearing steel Tensile strength, 800~900MPa can guarantee that the hardness of high-frequency quenching roller surface reaches 730~780HV, the quench-hardened case of roller surface Depth reaches 2.0~3.5mm.
CN201710383386.2A 2017-05-26 2017-05-26 Bearing steel for automobile hub and manufacturing method thereof Active CN108929997B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201710383386.2A CN108929997B (en) 2017-05-26 2017-05-26 Bearing steel for automobile hub and manufacturing method thereof
KR1020197035801A KR102314171B1 (en) 2017-05-26 2018-05-22 Bearing steel for automobile wheel hub and manufacturing method thereof
JP2019565185A JP6862578B2 (en) 2017-05-26 2018-05-22 Bearing steel for automobile hubs and its manufacturing method
DE112018002705.8T DE112018002705T5 (en) 2017-05-26 2018-05-22 Bearing steel for a vehicle wheel hub and method for producing such a bearing steel
PCT/CN2018/087792 WO2018214863A1 (en) 2017-05-26 2018-05-22 Bearing steel for use in automobile wheels and manufacturing process therefor

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Application Number Priority Date Filing Date Title
CN201710383386.2A CN108929997B (en) 2017-05-26 2017-05-26 Bearing steel for automobile hub and manufacturing method thereof

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CN108929997A true CN108929997A (en) 2018-12-04
CN108929997B CN108929997B (en) 2021-08-17

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CN108929997B (en) 2021-08-17

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