CN105821305A - Heat processing technology for niobium and titanium containing steel for motor train unit axle - Google Patents
Heat processing technology for niobium and titanium containing steel for motor train unit axle Download PDFInfo
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- CN105821305A CN105821305A CN201610416962.4A CN201610416962A CN105821305A CN 105821305 A CN105821305 A CN 105821305A CN 201610416962 A CN201610416962 A CN 201610416962A CN 105821305 A CN105821305 A CN 105821305A
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
Abstract
The invention relates to a heat processing technology for niobium and titanium containing steel for a motor train unit axle. The heat processing technology includes the following steps of 1, primary quenching, wherein the niobium and titanium containing steel for the high-speed motor train unit axle is heated to 870-900 DEG C, the heating and heat-preserving time in the temperature section is calculated by the ratio of 1.5-2.0 min/mm, and then the steel is water-cooled to room temperature; 2, secondary quenching, wherein the niobium and titanium containing steel for the high-speed motor train unit axle is heated to 850-880 DEG C, the heating and heat-preserving time in the temperature section is calculated by the ratio of 1.5-2.0 min/mm, and then the steel is cooled; 3, tempering, wherein the niobium and titanium containing steel for the high-speed motor train unit axle is heated to 620-680 DEG C, the heating and heat-preserving time in the temperature section is calculated by the ratio of 2-2.5 min/mm, and then the steel is air-cooled to the room temperature. The processed steel is good in strength and toughness match and excellent in fatigue resistance.
Description
Technical field
The present invention relates to field of alloy steel, be specifically related to be applicable to tensile strength 800～950MPa, yield strength >=650MPa ,-40 DEG C of KV2>=150J, requires the EMU axles steel Technology for Heating Processing with the anti-fatigue performance of excellence simultaneously.
Background technology
Axletree is to relate to one of safe most important motion and load bearing component in various vehicle.Owing to axletree subjects dynamic loading, stress is more complicated, and such as bending load, torsional load, bending combined load, and by certain impact, particularly EMU axletree, its stress is increasingly complex.Therefore, EMU axletree under arms during may because of tired, bend, reverse or tensile stress etc. and rupture, wherein fatigue fracture is the universal fracture mode of high speed axletree.For guaranteeing the safe operation of vehicle, EMU axletree must have enough reliabilities and fatigue safety coefficient.Motor train unit shaft material is one of key factor determining axletree service life and reliability, therefore, attaches great importance to the research and development to EMU axles steel and the research of fatigue behaviour both at home and abroad.
Along with the fast development of China Express Railway, the needs of axle of motor train unit are sharply increased, but still depend on import at present, therefore, be applicable to the high-strength and high ductility of China railways development characteristic and the plastics on new materials axle steel of long-fatigue life in the urgent need to exploitation.In recent years, carry out resisting fatigue both at home and abroad and destroy the research and development of axle steel.As the resisting fatigue in Chinese patent application 201110417295.9 destroys axle steel, still the high C content thinking of carbon axle steel in tradition is used, C content (0.42～0.45%) is higher, this makes the toughness of steel poor, the axle of motor train unit requirement to toughness cannot be met, and the limited extent that anti-fatigue performance improves is high.A kind of novel hollow axletree steel alloy in Chinese patent application 201210384581.4, although carbon content is relatively low, has preferable combination of strength and toughness, but fatigue strength is the most relatively low.The axle of motor train unit introduced from Europe mainly uses the steel alloy EA4T of modifier treatment, although the chemical composition of giving and mechanical property requirements, but do not provide crucial heat treatment process parameter, the more important thing is that the alloying element content affecting quenching degree in steel is on the low side, cause the tissue within the axle of motor train unit of big specification (there is the ferrite not allowing to exist) and performance (nearly heart portion intensity, toughness and fatigue behaviour are on the low side) to be often difficult to the requirement of the standard that reaches.These are restricted the most in actual applications, and the amplitude that the most crucially axle steel anti-fatigue performance improves is the most limited, affects its popularization and application.
Summary of the invention
For above problems of the prior art, it is an object of the invention to provide a kind of tensile strength 800～950MPa, yield strength >=650MPa ,-40 DEG C of KV2>=150J, requires the EMU axles steel Technology for Heating Processing with the anti-fatigue performance of excellence simultaneously.Concrete technical scheme is as follows:
A kind of titanium axle of motor train unit steel heat treatment process Han niobium, comprises the steps:
(1) for the first time quenching: niobium titanium EMU axles steel will be contained and be heated to temperature 870～900 DEG C, and in this temperature section heating and thermal insulation time by 1.5～2.0min/mm calculating, carry out water-cooled subsequently to room temperature；
(2) second time quenching: will contain niobium titanium EMU axles steel and be heated to temperature 850～880 DEG C, in this temperature section heating and thermal insulation time by 1.5～2.0min/mm calculating, cools down subsequently；
(3) tempering: will contain niobium titanium EMU axles steel and be heated to temperature 620～680 DEG C, in this temperature section heating and thermal insulation time by 2～2.5min/mm calculating, air cooling is to room temperature subsequently.
Further, in step (1)-(3), firing rate is 50～100 DEG C/h.
Further, in step (2), in quenching tank, by nozzle, axletree is carried out underwater water-spraying rapid water and be cooled to room temperature.
Further, in step (2), rate of cooling controls at 1.5～2.5 DEG C/s.
Further, step (1) is heated to temperature 890 DEG C, heating and thermal insulation time 270min, water-cooled with 80 DEG C/h.
Further, step (2) is heated to temperature 870 DEG C, heating and thermal insulation time 270min, quick water-cooled with 80 DEG C/h.
Further, step (3) is heated to temperature 650 DEG C, heating and thermal insulation time 420min, air cooling with 80 DEG C/h.
Further, it is applied to containing niobium titanium EMU axles steel production technology, specifically includes following steps: electric arc furnace or converter smelting → LF stove refine → RH or VD vacuum outgas → continuous casting → strand heating furnace heating → axle blank rolling → axle blank forging → blank axletree rough turn → axletree neat end face processing → " quenching for the first time+for the second time quenching+high tempering " heat treatment → axletree outer circle finish turning processing → axletree internal bore boring processing → cylindricalo grinding → flaw detection.
Further, step (1)-(3) high speed axle of motor train unit maximum gauge be Φ 200mm, length reach 2200mm.
Use that the chemical composition of the present invention, technological process and Technology for Heating Processing technological parameter produce containing niobium titanium EMU axles steel, the vertical mixing coefficient measuring steel can reach: Rm: 800MPa～950MPa, ReLOr Rp0.2>=650MPa, A >=18%, Z >=40% ,-40 DEG C of impacts of collision absorb merit KV2≥150J；Fracture toughness KQValue >=120MPa m1/2；The endurance limit under rotating bending R of SpecimensfL>=400MPa, the endurance limit under rotating bending R of notched specimenfE>=330MPa, notch sensitivity RfL/RfE≤1.15；The magnitude of interference is the Fretting Fatigue Limit >=225MPa of 0.04mm sample；It is >=285MPa that salt air corrosion 14 circulates the corrosion fatigue limit of cycle sample；The autstenitic grain size of steel is more than or equal to 8.0 grades；After EMU axletree " quenched (quenching+high tempering) " heat treatment, steel is organized as tempered sorbite+a small amount of lower bainite, wherein, axletree near surface tempered sorbite content is 100%, and at axletree 1/2 radius, tempered sorbite content is about 85～95%.
Detailed description of the invention
Describing the present invention below, it is a kind of preferred embodiment in numerous embodiments of the present invention.
In a preferred embodiment, a kind of titanium axle of motor train unit steel heat treatment process Han niobium, comprise the steps: (1) for the first time quenching: niobium titanium EMU axles steel will be contained and be heated to temperature 870～900 DEG C, in this temperature section heating and thermal insulation time by 1.5～2.0min/mm calculating, carry out water-cooled subsequently to room temperature；(2) second time quenching: will contain niobium titanium EMU axles steel and be heated to temperature 850～880 DEG C, in this temperature section heating and thermal insulation time by 1.5～2.0min/mm calculating, cools down subsequently；(3) tempering: will contain niobium titanium EMU axles steel and be heated to temperature 620～680 DEG C, in this temperature section heating and thermal insulation time by 2～2.5min/mm calculating, air cooling is to room temperature subsequently.
In a further advantageous embodiment, following scheme can be used: (1) suitably reduces the C element content in tradition carbon axle, improves toughness and the plasticity of steel；(2) in steel, add Ni, Cu element and improve quenching degree and the corrosion resistance of steel, and add Zr, Nb, Ti element of trace with crystal grain thinning, thus improve the toughness particularly low-temperature flexibility of steel, and improve intensity and the toughness cooperation of steel, improve the anti-fatigue performance of steel；(3) adding appropriate Ca element, the field trash in steel carries out degenerative treatments, impurity element T [O], the content of P, S etc. in the strictest control steel, to improve the anti-fatigue performance of steel further.The present invention's it is critical that adjust optimizing components and control organically to combine with metallurgical quality, while obtaining high intensity, it is thus achieved that excellent resisting fatigue destructive characteristics and relatively low cost.
The specific chemical composition (weight %) of steel of the present invention is as follows: C:0.24～0.30, Si:0.20～0.40, Mn:0.70～1.00, Cr:0.90～1.20, Ni:0.70～1.30, Mo:0.20～0.30, Cu:0.10～0.60, Zr:0.01～0.04, Nb:0.020～0.050, Ti:0.015～0.030, Ca:0.001～0.005, P≤0.010, S≤0.008, T [O]≤0.0015, Als:0.015～0.045, remaining for Fe with other inevitable impurity.
The effect of above-mentioned each element and proportioning are according to as follows:
C:C element is that axle steel obtains necessary to high intensity, hardness.C content in tradition axle steel is higher, if the carbon content in current lorry axle steel LZ50 is 0.50%.Although high C content is favourable to the intensity of steel, hardness etc., but the plasticity and toughness to steel is totally unfavorable, and make yield tensile ratio reduce, Decarburization Sensitivity increases, and deteriorates anti-fatigue performance and the processing characteristics of steel.The most suitably reduce the C content in steel, controlled below 0.30%.But, in order to obtain required high intensity and necessary fatigue behaviour after quenching and high tempering, C content must be more than 0.24%, thus C content preferably controls to be 0.24～0.30%.
Si:Si is deoxidant element main in steel, there is the strongest solution strengthening effect, but the plasticity and toughness that make steel are declined by Si too high levels, the activity increase of C, promote steel decarburization in rolling and heat treatment process and graphitization tendency, and make smelting difficulty and be easily formed field trash, deteriorating the anti-fatigue performance of steel.Therefore controlling Si content is 0.20～0.40%.
Mn:Mn is the effective element of deoxidation and desulfurization, it is also possible to improve quenching degree and the intensity of steel, when content is less than 0.70%, it is difficult to function as described above.But during hardened steel tempering, Mn and P has strong grain boundary cosegregation to be inclined to, and promotes temper brittleness, deteriorate the toughness of steel, thus control Mn content below 1.00%.
Cr:Cr can be effectively improved quenching degree and the resistance to tempering of steel, the high intensity needed for obtaining；Cr also can reduce the activity of C simultaneously, it is possible to decrease heats, roll and steel surface decarburizing tendency in heat treatment process, has to utilize and obtains high anti-fatigue performance.But too high levels can deteriorate the toughness of steel, thus controlling Cr content is 0.90～1.20%.
Ni:Ni can improve the quenching degree of steel, corrosion resistance and guarantee steel toughness at low temperatures.In view of economy, controlling Ni content is 0.80～1.30%.
Mo:Mo effect in steel predominantly improves quenching degree, improves resistance to tempering and prevent temper brittleness.Additionally, the reasonable coordination of Mo element and Cr element can make quenching degree and resistance to tempering be improved significantly.Mo content the most above-mentioned too low limited use, Mo too high levels, the most above-mentioned effect is saturated, and improves the cost of steel.Therefore, controlling Mo content is 0.20～0.30%.
Cu:Cu is similar to Ni in terms of solution strengthening, raising quenching degree.Meanwhile, adding copper and also can improve the corrosion fatigue resistant performance of steel in steel, because tiny Cu precipitation has blocked the formation of the initial stage vein texture of fatigue, and copper precipitate has good plasticity, can hinder the extension of fatigue crack；The steel corrosion resistance effect it addition, Cu also improves；Thus improve the corrosion fatigue strength of steel.But Cu too high levels, steel easily causes hot-short in heating rolling or forging process.Considering, range-controllable system is 0.10～0.60%.
Zr: adding a small amount of zirconium has degassing, purification and Grain refinement, is conducive to improving low temperature impact properties and intensity, the fatigue behaviour index of steel.Considering, range-controllable system is 0.010～0.040%.
Nb:Nb mainly shows as crystal grain refinement, precipitation strength and phase transformation strengthening to the Strengthening and Toughening effect of axle steel.Nb exists with displacement solute atoms in steel, Nb atomic ratio iron atom size is big, easily segregation on dislocation line, dislocation climb is produced strong effect of dragging, makes Recrystallization nucleation be suppressed, recrystallization is had strong interception, improve the recrystallization temperature of austenite, thus reaching the purpose of fining austenite grains, crystal grain refinement can not only improve the obdurability of steel, and improves the cryogenic property of steel.But it is expensive.Considering, the range-controllable system of Nb is 0.020%～0.050%.
Ti: add tiny alloying element Ti in steel and can play solid solution, segregation and precipitation, when them, Interaction Energy produces refined crystalline strengthening, precipitate dispersion-strengtherning and inclusion conditioning etc. with carbon, nitrogen, sulfur etc., the intensity and the toughness that make steel are strengthened, and can improve steel belt roof bolt stability.Considering, the range-controllable system of Ti is 0.015%～0.030%.
Ca:Ca has deoxidization desulfuration and the effect to non-metallic inclusion degenerative treatments, thus improves toughness and the anti-fatigue performance of steel.Ca content does not has above-mentioned effect less than 0.001%, but content is more than 0.005%, then add extremely difficult, and field trash amount increases.Thus controlling Ca content is 0.001～0.005%.
P:P can form microsegregation when solidification of molten steel, and when austenitizing temperature heats, segregation, at crystal boundary, makes the fragility of steel significantly increase subsequently, so controlling the content of P below 0.012%.
S: inevitable impurity in steel, forms MnS and is mingled with and can deteriorate toughness and the anti-fatigue performance of steel at Grain Boundary Segregation, thus control its content below 0.008%.
T [O]: oxygen forms various oxide in steel and is mingled with.Under the effect of stress, easily produce stress at these oxide places of being mingled with and concentrate, cause the germinating of micro-crack, thus deteriorate mechanical property particularly toughness and the anti-fatigue performance of steel.Therefore, must take measures to reduce its content as far as possible in metallurgical production.In view of economy, control its content below 0.0015%.
Present invention titanium EMU axles steel technological process of production Han niobium is: electric arc furnace or converter smelting → LF stove refine → RH or VD vacuum outgas → continuous casting → strand heating furnace heating → axle blank rolling → axle blank forging → blank axletree rough turn → axletree neat end face processing → " for the first time quenching+for the second time quenching+high tempering " heat treatment → axletree outer circle finish turning processing → axletree internal bore boring processing → cylindricalo grinding → flaw detection.
The Technology for Heating Processing step of present invention key is as follows:
(1) for the first time quenching: by maximum gauge be 200mm, length reach the heating containing niobium titanium EMU axles steel (firing rate is 50～100 DEG C/h) of 2200mm to temperature 870～900 DEG C, in this temperature section heating and thermal insulation time by 1.5～2.0min/mm calculating, carry out water-cooled subsequently to room temperature.After quenching for the first time, not only refine crystal grain, and improved the inhomogeneities of tissue, carried out tissue for finished heat treatment subsequently and prepare.
(2) second time quenching: by maximum gauge be 200mm, length reach the heating containing niobium titanium EMU axles steel (firing rate is 50～100 DEG C/h) of 2200mm to temperature 850～880 DEG C, in this temperature section heating and thermal insulation time by 1.5～2.0min/mm calculating, subsequently in quenching tank, by nozzle, axletree is carried out the quick water-cooled of underwater water-spraying (rate of cooling controls at 1.5～2.5 DEG C/s) to room temperature.
(3) tempering: by maximum gauge be 200mm, length reach the heating containing niobium titanium EMU axles steel (firing rate is 50～100 DEG C/h) of 2200mm to temperature 620～680 DEG C, in this temperature section heating and thermal insulation time by 2～2.5min/mm calculating, air cooling is to room temperature subsequently.Through tempering, the metallographic structure of uniform fine and closely woven tempered sorbite+a small amount of lower bainite can be obtained, thus good toughness plasticity and suitable intensity index can be obtained.
In a further advantageous embodiment, following scheme can be used: the titanium EMU axles steel technological process of production containing niobium is: electric arc furnace or converter smelting → LF stove refine → RH or VD vacuum outgas → continuous casting → strand heating furnace heating → axle blank rolling → axle blank forging → blank axletree rough turn → axletree neat end face processing → " for the first time quenching+for the second time quenching+high tempering " heat treatment → axletree outer circle finish turning processing → axletree internal bore boring processing → cylindricalo grinding → flaw detection.
The present invention is as follows with the embodiment of performance containing the melting chemical composition of niobium titanium EMU axles steel, main heat treatment process parameter:
Technology for Heating Processing step and parameter be:
(1) quenching for the first time: be heated to temperature 890 DEG C, heating and thermal insulation time 270min, water-cooled with 80 DEG C/h.
(2) second time quenching: be heated to temperature 870 DEG C, heating and thermal insulation time 270min, quick water-cooled (rate of cooling controls at 1.5～2.5 DEG C/s) with 80 DEG C/h.
(3) tempering: be heated to temperature 650 DEG C, heating and thermal insulation time 420min, air cooling with 80 DEG C/h.
Maximum gauge is Φ 200mm, length reaches the melting chemical composition mass percent (wt%) of 2200mm EMU axletree and is shown in Table 1, and EMU axletree performance indications after above heat treatment are shown in Table 2.
The melting chemical composition mass percent (wt%) of table 1 EMU axletree steel
Performance indications after table 2 EMU axletree heat treatment
Performance indications after continued 2 EMU axletree heat treatment
The present invention compared with prior art has the advantage that intensity is high, anti-fatigue performance is excellent.Can obtain the high intensity of more than 800MPa, its plasticity and toughness are substantially better than business steel, its fatigue limit business to be significantly higher than steel, present good strength and toughness and coordinate and the anti-fatigue performance of excellence.Wherein: Rm: 800MPa～950MPa, ReLOr Rp0.2>=650MPa, A >=18%, Z >=40% ,-40 DEG C of impacts of collision absorb merit KV2≥150J；Fracture toughness KQValue >=120MPa m1/2；The endurance limit under rotating bending R of SpecimensfL>=400MPa, the endurance limit under rotating bending R of notched specimenfE>=330MPa, notch sensitivity RfL/RfE≤1.15；The magnitude of interference is the Fretting Fatigue Limit >=225MPa of 0.04mm sample；It is >=285MPa that salt air corrosion 14 circulates the corrosion fatigue limit of cycle sample；The autstenitic grain size of steel is more than or equal to 8.0 grades；After EMU axletree " quenched (quenching+high tempering) " heat treatment, steel is organized as tempered sorbite+a small amount of lower bainite, wherein, axletree near surface tempered sorbite content is 100%, and at axletree 1/2 radius, tempered sorbite content is about 85～95%.
Above the present invention is exemplarily described; obviously the present invention implements and is not subject to the restrictions described above; as long as the various improvement that the method design that have employed the present invention is carried out with technical scheme, or the most improved that directly apply to other occasion, all within protection scope of the present invention.
Claims (9)
1. a titanium axle of motor train unit steel heat treatment process Han niobium, it is characterised in that comprise the steps:
(1) for the first time quenching: niobium titanium EMU axles steel will be contained and be heated to temperature 870～900 DEG C, and in this temperature section heating and thermal insulation time by 1.5～2.0min/mm calculating, carry out water-cooled subsequently to room temperature；
(2) second time quenching: will contain niobium titanium EMU axles steel and be heated to temperature 850～880 DEG C, in this temperature section heating and thermal insulation time by 1.5～2.0min/mm calculating, cools down subsequently；
(3) tempering: will contain niobium titanium EMU axles steel and be heated to temperature 620～680 DEG C, in this temperature section heating and thermal insulation time by 2～2.5min/mm calculating, air cooling is to room temperature subsequently.
2. the titanium axle of motor train unit steel heat treatment process Han niobium as claimed in claim 1, it is characterised in that step (1)-(3)
Middle firing rate is 50～100 DEG C/h.
3. the titanium axle of motor train unit steel heat treatment process Han niobium as claimed in claim 1 or 2, it is characterised in that step (2)
In, in quenching tank, by nozzle, axletree is carried out underwater water-spraying rapid water and be cooled to room temperature.
4. as described in claim 1-3 containing niobium titanium axle of motor train unit steel heat treatment process, it is characterised in that in step (2),
Rate of cooling controls at 1.5～2.5 DEG C/s.
5. as described in claim 1-4 containing niobium titanium axle of motor train unit steel heat treatment process, it is characterised in that in step (1)
It is heated to temperature 890 DEG C, heating and thermal insulation time 270min, water-cooled with 80 DEG C/h.
6. as described in claim 1-5 containing niobium titanium axle of motor train unit steel heat treatment process, it is characterised in that in step (2)
It is heated to temperature 870 DEG C, heating and thermal insulation time 270min, quick water-cooled with 80 DEG C/h.
7. as described in claim 1-6 containing niobium titanium axle of motor train unit steel heat treatment process, it is characterised in that in step (3)
It is heated to temperature 650 DEG C, heating and thermal insulation time 420min, air cooling with 80 DEG C/h.
8. as described in claim 1-7 containing niobium titanium axle of motor train unit steel heat treatment process, it is characterised in that it is applied to contain
Niobium titanium EMU axles steel production technology, specifically includes following steps: electric arc furnace or converter smelting → LF stove are smart
Refining → RH or VD vacuum outgas → continuous casting → strand heating furnace heating → axle blank rolling → axle blank forging → blank vehicle
Axle is rough turn → axletree neat end face processing → " quenching for the first time+for the second time quenching+high tempering " heat treatment → axletree cylindrical
Finish turning processing → axletree internal bore boring processing → cylindricalo grinding → flaw detection.
9. as described in claim 1-8 containing niobium titanium axle of motor train unit steel heat treatment process, it is characterised in that step (1)-
(3) high speed axle of motor train unit maximum gauge be Φ 200mm, length reach 2200mm.
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| CN104233109A (en) * | 2014-10-11 | 2014-12-24 | 马钢(集团)控股有限公司 | Heat-treating process of high-speed train axle containing niobium and titanium |
| CN105441788A (en) * | 2015-12-18 | 2016-03-30 | 马鞍山钢铁股份有限公司 | Vanadium-containing 12.9-grade steel for fastener applied to rail transit mobile equipment and thermal treatment process of vanadium-containing 12.9-grade steel |
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| CN104233109A (en) * | 2014-10-11 | 2014-12-24 | 马钢(集团)控股有限公司 | Heat-treating process of high-speed train axle containing niobium and titanium |
| CN105441788A (en) * | 2015-12-18 | 2016-03-30 | 马鞍山钢铁股份有限公司 | Vanadium-containing 12.9-grade steel for fastener applied to rail transit mobile equipment and thermal treatment process of vanadium-containing 12.9-grade steel |
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