CN104372258A - CrNiMo high-strength pinion steel and preparation method thereof - Google Patents
CrNiMo high-strength pinion steel and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a CrNiMo high-strength pinion steel and a preparation method thereof. The pinion steel comprises the following chemical components in percentage by mass: 0.19%-0.25% of C, 0.17%-0.37% of Si, 0.70%-1.00% of Mn, at most 0.030% of P, at most 0.030% of S, 0.85%-1.25% of Cr, 0.40%-0.70% of Ni, 0.30%-0.40% of Mo, 0.015%-0.050% of Al, at most 2.5*10<-4>% of H, 30*10<-4>%-80*10<-4>% of N, at most 15*10<-4>% of T.O, and the balance of Fe and inevitable impurities. The invention also provides a preparation method of the pinion steel. The nickel molybdenum alloy is added to improve the heat treatability of the material, thereby ensuring the mechanical properties of the material. The hardenability of the material is enhanced, and the material satisfies the performance requirements for large module pinions.
Description
Technical field
The present invention relates to a kind of CrNiMo high-strength gear steel and preparation method thereof, belong to steel alloy type gear smelting steel technical field.
Background technology
Pinion Steel is large usage quantity in automotive material, requires one of higher critical material, the technico-economical comparisones such as it not only affects vehicle ages, energy consumption, and also most important for meeting safety, environmental protection and comfort requirement.
From the eighties, China in a planned way introduces all kinds of advanced vehicle of industrially developed country, and all kinds of external advanced Medium or severe type cargo vehicle is also constantly introduced.Meanwhile, each large auto producer of China is cooperated with foreign well-known automobile major company, and Introduced From Abroad advanced automobile production technology, comprising the production technology of automobile gear.At present, China's Pinion Steel substantially meet use and imported technology process production domesticization requirement, but for the back axle gear steel of heavy goods vehicles transmitting gear and medium and heavy car, due to overload use and the road conditions poor of domestic heavy-duty car, make gear often bear larger overload impact load, often cause gear early failure.For high-power gearbox gear, requirement can bear large stress, thus guarantees that gear just becomes the problem of most critical the fatigue lifetime under large stress.In conjunction with service condition and the failure mode of high-power gearbox gear, mainly should consider three kinds of following fatigue strength: i.e. bending fatigue strength, impact fatigue intensity and anti-corrosion fatigue strength, thus gear material is strengthened.The control of the control, particularly alloying element of chemical composition, purity, grain fineness number, tissue characteristics, hardening capacity and mechanical property etc. then must be considered for improving three kinds of fatigue strength.
In structure iron field, hardening capacity be carry out high-quality and economically selection and Composition Design time the problem first considered.From hardness, it is measuring of steel quenching post-hardening layer depth.The mechanical property of steel, especially yield strength and impelling strength and hardening capacity closely related, and be difficult to complete through hardening during heavy in section structure unit thermal treatment.Therefore, the hardening capacity problem of structure iron always causes the great attention of people.
Chinese patent document CN101096742A provides a kind of automobile high-strength Pinion Steel, its Ingredient percent is: C:0.20-0.40, Si:0.20-0.50, Mn:0.50-1.00, Cr:0.80-1.30, Nb:0.015-0.080, V:0.030-0.090, Mo:0.15-0.55, Al:0.015-0.050, remaining is Fe and inevitable impurity.It, mainly through adding Nb, the V element of trace, improves the comprehensive mechanical property of the grain fineness number of Pinion Steel, hardening capacity and bandwidth, increase Pinion Steel, improves work-ing life, reduces production cost.CN101319294A discloses a kind of fine grain carburizing gear steel and preparation method thereof, and its composition (% by weight) is: C 0.15-0.25%, Si≤0.35%, Mn 0.60-0.90%, Cr 0.80-1.20%, P≤0.015%, S≤0.010%, Nb0.02-0.08%, B 0.005-0.0035%, Mo 0.15-0.35%, Al 0.02-0.06%, Ti0.01-0.04%, remaining is Fe and inevitable impurity.It reaches crystal grain thinning mainly through adding Nb, B, Ti and improves the effect of Pinion Steel thermoplasticity, adopt the cold rolling rolling process lower than 900 DEG C that the Second Phase Particle of Dispersed precipitate in steel carburizing crystal grain compared with existing carbonized Gear Steel 20CrMoH is improved, the corresponding raising of bending fatigue strength, contact fatigue life.Chinese patent document CN1861830A relates to a kind of steel for heavy loading gear, which provide the heavy-load gear steel of a kind of high-tensile, HI high impact merit, little, the easy processing of carburizing and quenching distortion, mainly through adding Nb, Cr, Ni, Mo, V crystal grain thinning and ensureing enough hardening capacity, add RE and ensure low [O] content, guarantee the oxidizable element such as fatigue strength, reduction Si, Mn during heavy duty, to improve carburizing and basic toughness further.But, the Pinion Steel of above-mentioned CN101096742A, CN101319294A is Cr-Mo system Pinion Steel, the former realizes the raising of Pinion Steel quality, performance by Nb, V microalloying, the latter mainly crosses and adds Nb, B, Ti element and adopt specific rolling technology to improve the performance of Pinion Steel, although both improve the performance of Pinion Steel, be unfavorable for the reduction of cost.And the heavy-load gear steel of CN1861830A exploitation belongs to Cr-Ni-Mo system Pinion Steel, realizing by adding Nb, V and RE the effect improving its performance, improve raw-material cost simultaneously.
Summary of the invention
Control undesirable for current Cr-Mn-Ti system Pinion Steel (representing steel grade 20CrMnTiH and sub-grade of steel thereof) in the hardening capacity of producing and expose in use procedure, H fluctuation is large, hardening capacity is on the low side, the problem such as heavy-load automobile and large profile shaft tooth class part performance requriements can not be met, the invention provides a kind of CrNiMo high-strength gear steel and preparation method thereof.Pinion Steel of the present invention has hardening capacity height and stablizes, it is narrow to be with, and can meet high strength, the processing of large module gear and service requirements.
Technical scheme of the present invention is as follows:
A kind of CrNiMo high-strength gear steel, chemical composition mass percent is as follows:
C:0.19% ~ 0.25%, Si 0.17% ~ 0.37%, Mn:0.70% ~ 1.00%, P≤0.030%, S≤0.030%, Cr:0.85% ~ 1.25%, Ni:0.40% ~ 0.70%, Mo:0.30% ~ 0.40%, Al:0.015% ~ 0.050%, H≤2.5 × 10
-4%, N:30 × 10
-4% ~ 80 × 10
-4%, T.O≤15 × 10
-4%, surplus is Fe and inevitable impurity.
According to the present invention, preferably, described CrNiMo high-strength gear steel, chemical composition mass percent is as follows:
C:0.20% ~ 0.24%, Si 0.20% ~ 0.30%, Mn:0.90% ~ 1.00%, P≤0.015%, S≤0.015%, Cr:1.05% ~ 1.20%, Ni:0.42% ~ 0.46%, Mo:0.30% ~ 0.35%, Al:0.015% ~ 0.050%, H≤2.5 × 10
-4%, N:30 × 10
-4% ~ 80 × 10
-4%, T.O≤15 × 10
-4%, surplus is Fe and inevitable impurity.
According to the present invention, preferably, described CrNiMo high-strength gear steel, chemical composition mass percent is as follows:
C:0.22%, Si 0.20%, Mn:0.91%, P≤0.015%, S≤0.015%, Cr:1.08%, Ni:0.42%, Mo:0.32%, Al:0.0208%, H≤2.5 × 10
-4%, N:63.8 × 10
-4%, T.O≤15 × 10
-4%, surplus is Fe and inevitable impurity.
According to the present invention, determine that three large key elements of service life of gear are: the accuracy of mesh of counter-bending fatigue, anti-contact fatigue, gear.The formation of gear material alloying element and through hardening ability is the prerequisite determining three large key elements.Pinion Steel is generally converted steel, and carbon content is 0.20 ~ 0.24%.Lower carbon content can ensure that there is good toughness in part heart portion.Silicon (Si): add silicon as reductive agent and reductor in steelmaking process, so killed steel contains the silicon of 0.20 ~ 0.30%.The effect of chromium, manganese, nickel, molybdenum is the hardening capacity increasing steel.But chromium and molybdenum are carbide forming element, surface layer carbon content will be impelled to increase, easily in diffusion layer organization, occur a large amount of carbide, penetrated layer property is worsened.Therefore the control 1.05% ~ 1.20% of Cr content is better.Various excellent in mechanical performance after nickel makes steel carburizing, but manufacturability is poor, can not direct quenching after forging stock carburizing, through heating quenching again, and technique is more complicated, and price is more expensive.Ni controls 0.42% ~ 0.46% better; Carburizing heat treatment process determines gear quality, use properties and the important procedure in work-ing life, what its determined the surface of gear, centre hardness and the distortion after metallographic structure, thermal treatment and gear during working gear contacts situation, the design of steel chemical composition should make carburizing rear surface excessive gently to heart portion carbon distribution, and after quenching, cementation zone does not occur increasing fragility, the bulk carbide making part early damage or carbide network.Silicon can reduce case depth and carbon contents, and increase formation oxide compound is tendency in cementation zone; Manganese can increase the quantity of residual austenite in cementation zone, therefore manganese controls 0.90% ~ 1.00% better; Chromium can increase carbon content and residual austenite quantity in surface layer; Molybdenum can increase surface layer carbon content and reduce to be formed the tendency of oxide compound, and molybdenum controls 0.30% ~ 0.35% better; Phosphorus (P): in the ordinary course of things, phosphorus is harmful element in steel, increases the cold shortness of steel, bad, and reduce plasticity, cold-bending property is degenerated, and P controls at P≤0.015%; Sulphur (S): sulphur is also harmful element under normal conditions, makes steel produce red brittleness, S≤0.015%; Aluminium is reductor conventional in steel.A small amount of aluminium is added in steel, can crystal grain thinning, improve impelling strength, aluminium also has oxidation-resistance and corrosion resistance, and aluminium and chromium, silicon share, and can significantly improve the high temperature non-scale performance of steel and the ability of high-temperature corrosion resistance.The shortcoming of aluminium is the hot workability, the machinability that affect steel, and therefore, aluminium controls 0.015% ~ 0.050% better.
The preparation method of the present invention's above-mentioned CrNiMo high-strength gear steel, step is as follows:
(1) electrosmelting
The low nickel pig iron and waste steel ingredient, the low nickel pig iron accounts for 18 ~ 25% of batching quality, molten iron add that quality is dosage 40 ~ 55%; Lime 40 ~ 45kg/t steel is added in blending process, rhombspar 9 ~ 12kg/t steel, at fusing early stage spray carbon dust making foamed slag, end point carbon lower than 0.10% time, add steel-core-aluminium 1.5 ~ 2.5kg/t steel by the upper limit with tapping stream, allocate alloy adjustment into according to composition lower limit during ladle alloying, synthetic slag consumption 18 ± 2kg/t steel, P≤0.015% when controlling to tap, tapping temperature 1630 ~ 1680 DEG C;
(2) refining furnace is smelted
Control basicity of slag 3.0 ± 0.5, slag ingredient CaO 50% ~ 55%, SiO
25% ~ 10%, Al
2o
310% ~ 15%, (FeO+MnO≤1.0%), refining process keeps white slag; After fully stirring under white slag, get a sample total analysis, before getting a sample, feeding aluminum steel 0.5 ~ 1.5m/t steel, according to a sample analytical results, by component contents such as internally controlling requirement adjustment C, Si, Mn, Cr, Mo, Ni; Before the tapping of LF refining furnace, in feeding aluminum steel adjustment control steel, Holo-Al content target is 0.030 ~ 0.060%, and according to 2.0 ~ 4.0m/t steel feeding silicon-calcium wire or 1.0 ~ 2.5m/t steel feeding calcium line, the white slag hold-time is greater than 20min;
(3) VD stove vacuum refinement
Vacuum tightness be less than 67Pa hold-time >=12 minutes, soft argon blowing time >=15 minute after the process of VD stove, control upper steel temperature after the process of VD stove soft blow argon: 1590 ~ 1610 DEG C, continuous casting first stove, the second stove plays 1570 ~ 1590 DEG C;
(4) continuous casting
Pouring basket liquid level 700 ± 50mm, liquid level fluctuation of crystallizer≤± 2mm, tundish superheating temperature presses 15 ~ 30 DEG C of target controls, tundish first furnace temperature 1540 ~ 1550 DEG C, 1525 ~ 1540 DEG C later, the second stove; Casting speed control 180mm × 220mm base type controls according to 0.90 ~ 1.35m/min; 260mm × 300mm base type according to 0.55 ~ 0.70m/min control, strand enters withdrawal straightening machine temperature >=920 DEG C, enter to cheat slow cooling time >=24 hours, go out to cheat temperature≤250 DEG C;
(5) rolling
Preheating section temperature 500 ~ 850 DEG C, heating zone temperature 1200 ~ 1270 DEG C, soaking zone temperature 1200 ~ 1250 DEG C; Cold base heat-up time >=2.5h, hot base heat-up time >=2.0h, start rolling temperature >=1100 DEG C, finishing temperature >=850 DEG C.
According to the present invention, preferably, in step (1), in the low nickel pig iron, nickel content is 1.6 ~ 2.0wt%.Economical for ensureing that low nickel pig iron electric furnace is smelted, feed proportioning optimization structure, improve low nickel pig iron add-on, adopt solid ingredient pattern; The low nickel pig iron is allocated into by steel grade nickel element specification lower limit, and nickel recovery rate calculates with 100%.
According to the present invention, preferably, in step (3), vacuum tightness is less than 12 ~ 15 minutes 67Pa hold-times, soft argon blowing time 15 ~ 20 minutes after the process of VD stove.
According to the present invention, preferably, in step (4), casting speed control 180mm × 220mm base type controls according to 1.10 ± 0.02m/min, 260mm × 300mm base type controls according to 0.62 ± 0.02m/min, and strand enters withdrawal straightening machine temperature 920 ~ 1020 DEG C, enters to cheat 25 ~ 30 hours slow cooling time.
According to the present invention, preferably, cold base 3 ~ 5h heat-up time in step (5), hot base 2.0 ~ 4h heat-up time, start rolling temperature 1120 ~ 1150 DEG C, finishing temperature 900 ~ 960 DEG C.
Beneficial effect of the present invention is as follows:
1, nickel of the present invention, molybdenum alloy add the heat treatment performance improving material, ensure that every mechanical property of material, add the through hardening performance of material simultaneously, meet the performance requriements of large module gear.
2, Pinion Steel macrostructure of the present invention is good, and inclusion behavior is low, and gas content is low, and crystal grain is tiny, dense structure, and banded structure rank is low, and H and stability significantly improve.Improve performance of technical process and the thermal treatment of material.
3, basicity is the important factor ensureing slag dephosphorization and desulfurization ability.But be not that basicity is more high better, but have a best alkalinity ranges.Because Primary period furnace temperature is low, as basicity of slag is too high, the bits dephosphorisation reaction that is clamminess can not effectively carry out; Can make the higher slag of basicity to later stage furnace temperature is high, but too highly can increase lime consumption and thermosteresis, and slag dephosphorization sulphur ability improves and few, finishing slag basicity can not be too small, otherwise affect removing and aggravating the erosion of slag to furnace lining of phosphorus sulphur.The present invention controls in 3.0 ~ 3.2 scopes through great many of experiments determination slag finishing slag basicity, slag ingredient CaO 50% ~ 55%, SiO
25% ~ 10%, Al
2o
310% ~ 15%, (FeO+MnO≤1.0%), meets the requirement of steel purity, meets the requirement of this steel high-hardenability, reduces costs simultaneously.
4, the present invention reasonably prepares burden structure, ensure that nickel content, reduces the cost of raw material simultaneously, add the benefit of steel.
Accompanying drawing explanation
Fig. 1 be the obtained Pinion Steel hot-rolled state metallographic structure photo of the embodiment of the present invention 1 100 ×.
Fig. 2 be the obtained Pinion Steel hot-rolled state metallographic structure photo of the embodiment of the present invention 1 500 ×.
Embodiment
Below by specific embodiment, the present invention will be further described, but be not limited thereto.
Embodiment 1
Following embodiment is for setting forth the present invention, but protection scope of the present invention is not limited to following examples.
The technological process of production is: batching → electric arc furnace smelting → LF refining furnace refining → VD vacuum refining furnace refining → bloom continuous casting → semi-tandem rolling mill milling.
Economical for ensureing that low nickel pig iron electric furnace is smelted, feed proportioning optimization structure, improve low nickel pig iron add-on, adopt solid ingredient pattern; The low nickel pig iron is allocated into by steel grade nickel element specification lower limit, and nickel recovery rate calculates with 100%.Charging cloth set low nickel pig iron cloth around aniseed and near material frame bottom but to avoid fire door prevent fusing time splash.
Test production 4 heat, numbering 1#, 2#, 3# and 4# respectively.
(1) electric arc furnace smelting
Burden structure is steel scrap+low nickel pig iron (nickel mass content is 1.6 ~ 2.0%)+molten iron, and molten iron proportion is greater than 40%; 4 wall lance oxygen decarburizations are main, and 1 furnace door oxygen lance oxygen decarburization is auxiliary; Combine with oxygen blast, winding-up carbon dust making foamed slag; With addition of 40 ~ 45 ㎏/t lime slag making dephosphorizations; Slag charge add-on 18 ± 2 ㎏/t in ladle.By heat, major control processing parameter lists in table 1.
Table 1 electric arc furnace smelting main technologic parameters
(2) LF refining furnace is smelted
Steel ladle bottom argon blowing gas agitating, adopts SiC diffusive deoxidation.Major control processing parameter and finishing slag main component list in table 2 and table 3 respectively.
Major control processing parameter smelted by table 2LF refining furnace
Finishing slag main component (mass percent, %) smelted by table 3LF refining furnace
(3) VD stove vacuum refinement
Before ladle enters VD stove, remove the slag of about 50%; After ladle to furnaceman VD position, major control processing parameter lists in table 4.
Table 4VD stove vacuum refinement major control processing parameter
(4) continuous casting
Continuous caster three machine three flows, casting blank specification 260 ㎜ × 300 ㎜.Continuous casting adopts large bag long nozzle argon to seal protection, and tundish adds low-carbon (LC) insulating covering agent and carbonization rice husk insulation, tundish molten steel liquid level 700 ㎜ ~ 750 ㎜, crystallizer submersed nozzle molding casting mode.Hydraulic non-sine oscillation; Mould liquid level controls automatically; Adopt M-EMS, parameter 300A/3.0HZ; The weak cold mode of two cold employing Dynamic controlling gas one fog coolings; Strand 3 aligning.Produce boracic pinion steel continuous casting Controlling Technology parameter and list in table 5.
Table 5 continuous casting Controlling Technology parameter
(5) rolling
Blank hot send rolling, and heat send casting blank surface temperature 700 DEG C ~ 730 DEG C, loads process furnace casting blank surface temperature 530 DEG C ~ 580 DEG C.Heating temperature 1200 DEG C ~ 1250 DEG C, allow temperature poor≤30 DEG C, heat-up time 2.0h ~ 2.8h, start rolling temperature 1100 DEG C ~ 1180 DEG C, finish to gauge Wen Du≤850 DEG C, the round steel of rolling specs Φ 110mm.Roll control processing parameter lists in table 6.
Table 6 roll control processing parameter
| Heat is numbered | Heating temperature, DEG C | Heat-up time, h | Start rolling temperature, DEG C | Finishing temperature, DEG C |
| 1# | 1200 | 2.4 | 1140 | 940 |
| 2# | 1200 | 2.5 | 1141 | 940 |
| 3# | 1210 | 2.4 | 1142 | 942 |
| 4# | 1210 | 2.4 | 1141 | 941 |
Result data
(1) composition
Table 7 embodiment of the present invention composition (mass percent, %)
(2) stocking service check result
The present embodiment low power, micro test and jominy test list in table 8, table 9 and table 10 respectively.
The macroscopic examination of table 8 embodiment of the present invention
The micro test of table 9 embodiment of the present invention
The jominy test of table 10 embodiment of the present invention
As can be seen from table 8 ~ table 10 and Fig. 1 ~ Fig. 2: CrNiMo high-strength gear steel macrostructure of the present invention is good, and inclusion behavior is low, and gas content is low, and crystal grain is tiny, dense structure, and banded structure rank is low, H significantly improves and the advantage such as to stablize.
Claims (10)
1. a CrNiMo high-strength gear steel, is characterized in that, chemical composition mass percent is as follows:
C:0.19% ~ 0.25%, Si 0.17% ~ 0.37%, Mn:0.70% ~ 1.00%, P≤0.030%, S≤0.030%, Cr:0.85% ~ 1.25%, Ni:0.40% ~ 0.70%, Mo:0.30% ~ 0.40%, Al:0.015% ~ 0.050%, H≤2.5 × 10
-4%, N:30 × 10
-4% ~ 80 × 10
-4%, T.O≤15 × 10
-4%, surplus is Fe and inevitable impurity.
2. CrNiMo high-strength gear steel according to claim 1, it is characterized in that, chemical composition mass percent is as follows:
C:0.20% ~ 0.24%, Si 0.20% ~ 0.30%, Mn:0.90% ~ 1.00%, P≤0.015%, S≤0.015%, Cr:1.05% ~ 1.20%, Ni:0.42% ~ 0.46%, Mo:0.30% ~ 0.35%, Al:0.015% ~ 0.050%, H≤2.5 × 10
-4%, N:30 × 10
-4% ~ 80 × 10
-4%, T.O≤15 × 10
-4%, surplus is Fe and inevitable impurity.
3. CrNiMo high-strength gear steel according to claim 1, it is characterized in that, chemical composition mass percent is as follows:
C:0.22%, Si 0.20%, Mn:0.91%, P≤0.015%, S≤0.015%, Cr:1.08%, Ni:0.42%, Mo:0.32%, Al:0.0208%, H≤2.5 × 10
-4%, N:63.8 × 10
-4%, T.O≤15 × 10
-4%, surplus is Fe and inevitable impurity.
4. a preparation method for the CrNiMo high-strength gear steel described in any one of claim 1-3, step is as follows:
(1) electrosmelting
The low nickel pig iron and waste steel ingredient, the low nickel pig iron accounts for 18 ~ 25% of batching quality, molten iron add that quality is dosage 40 ~ 55%; Lime 40 ~ 45kg/t steel is added in blending process, rhombspar 9 ~ 12kg/t steel, at fusing early stage spray carbon dust making foamed slag, end point carbon lower than 0.10% time, add steel-core-aluminium 1.5 ~ 2.5kg/t steel by the upper limit with tapping stream, allocate alloy adjustment into according to composition lower limit during ladle alloying, synthetic slag consumption 18 ± 2kg/t steel, P≤0.015% when controlling to tap, tapping temperature 1630 ~ 1680 DEG C;
(2) refining furnace is smelted
Control basicity of slag 3.0 ± 0.5, slag ingredient CaO 50% ~ 55%, SiO
25% ~ 10%, Al
2o
310% ~ 15%, (FeO+MnO≤1.0%), refining process keeps white slag; After fully stirring under white slag, get a sample total analysis, before getting a sample, feeding aluminum steel 0.5 ~ 1.5m/t steel, according to a sample analytical results, by component contents such as internally controlling requirement adjustment C, Si, Mn, Cr, Mo, Ni; Before the tapping of LF refining furnace, in feeding aluminum steel adjustment control steel, Holo-Al content target is 0.030 ~ 0.060%, and according to 2.0 ~ 4.0m/t steel feeding silicon-calcium wire or 1.0 ~ 2.5m/t steel feeding calcium line, the white slag hold-time is greater than 20min;
(3) VD stove vacuum refinement
Vacuum tightness be less than 67Pa hold-time >=12 minutes, soft argon blowing time >=15 minute after the process of VD stove, control upper steel temperature after the process of VD stove soft blow argon: 1590 ~ 1610 DEG C, continuous casting first stove, the second stove plays 1570 ~ 1590 DEG C;
(4) continuous casting
Pouring basket liquid level 700 ± 50mm, liquid level fluctuation of crystallizer≤± 2mm, tundish superheating temperature presses 15 ~ 30 DEG C of target controls, tundish first furnace temperature 1540 ~ 1550 DEG C, 1525 ~ 1540 DEG C later, the second stove; Casting speed control 180mm × 220mm base type controls according to 0.90 ~ 1.35m/min; 260mm × 300mm base type according to 0.55 ~ 0.70m/min control, strand enters withdrawal straightening machine temperature >=920 DEG C, enter to cheat slow cooling time >=24 hours, go out to cheat temperature≤250 DEG C;
(5) rolling
Preheating section temperature 500 ~ 850 DEG C, heating zone temperature 1200 ~ 1270 DEG C, soaking zone temperature 1200 ~ 1250 DEG C; Cold base heat-up time >=2.5h, hot base heat-up time >=2.0h, start rolling temperature >=1100 DEG C, finishing temperature >=850 DEG C.
5. the preparation method of CrNiMo high-strength gear steel according to claim 4, is characterized in that, in step (1), in the low nickel pig iron, nickel mass content is 1.6 ~ 2.0%.
6. the preparation method of CrNiMo high-strength gear steel according to claim 4, is characterized in that, in step (3), vacuum tightness is less than 12 ~ 15 minutes 67Pa hold-times.
7. the preparation method of CrNiMo high-strength gear steel according to claim 4, is characterized in that, soft argon blowing time 15 ~ 20 minutes after the middle VD stove process of step (3).
8. the preparation method of CrNiMo high-strength gear steel according to claim 4, it is characterized in that, in step (4), casting speed control 180mm × 220mm base type controls according to 1.10 ± 0.02m/min, and 260mm × 300mm base type controls according to 0.62 ± 0.02m/min.
9. the preparation method of CrNiMo high-strength gear steel according to claim 4, is characterized in that, in step (4), strand enters withdrawal straightening machine temperature 920 ~ 1020 DEG C, enters to cheat 25 ~ 30 hours slow cooling time.
10. the preparation method of CrNiMo high-strength gear steel according to claim 4, is characterized in that, cold base 3 ~ 5h heat-up time in step (5), hot base 2.0 ~ 4h heat-up time, start rolling temperature 1120 ~ 1150 DEG C, finishing temperature 900 ~ 960 DEG C.
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