CN109321712A - A kind of high-hardenability carburized gears 20CrNiB steel - Google Patents
A kind of high-hardenability carburized gears 20CrNiB steel Download PDFInfo
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- CN109321712A CN109321712A CN201811322890.2A CN201811322890A CN109321712A CN 109321712 A CN109321712 A CN 109321712A CN 201811322890 A CN201811322890 A CN 201811322890A CN 109321712 A CN109321712 A CN 109321712A
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires 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
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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
-
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- 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
- C21D2211/005—Ferrite
-
- 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
- C21D2211/009—Pearlite
Abstract
The present invention relates to a kind of high-hardenability carburized gears 20CrNiB steel, chemical component is designed as C:0.17~0.23%, Si by mass percentage :≤0.35%, Mn:0.50~0.95%, Cr:0.85~1.25%, S:0.015~0.030%, P :≤0.025%, Ni:0.15~0.25%, Nb:0.015~0.035%, B:0.0010~0.0030%, Cu :≤0.20%, Al:0.010~0.050%, Ca :≤0.0005%, surplus is Fe and inevitable impurity element.The bar that continuous casting and rolling based on ingredient design is produced, with higher end hardenability and grain size stability, the metallographic structure of hot-strip is uniform ferrite and pearlite, and end hardenability meets: J5=42~46HRC, J10=32~36HRC, grain size reach 7.0 grades.
Description
Technical field
The invention belongs to metallurgical technology fields, are related to steel alloy class.More particularly to a kind of continuous casting-continuous rolling production
20CrNiB pinion steel.
Background technique
Gear is important driving parts, transmits power, and tooth root will be answered by bending, contact repeatedly in transmission process
Power is also easy to produce the failure such as crooked fatigue fracture, abrasion, scratch scratch, tooth form peeling and deforming.Need to bear high torque speed changer
Gear selection 20Cr material is no longer satisfied the high-hardenability and intensity requirement of pinion steel.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of 20CrNiB steel for the above-mentioned prior art, original
Cr, Mn content are improved on 20Cr material foundation, the elements such as addition B, Ni, Nb significantly improve the intensity and harden ability of material, together
When improve the grain size stability of material, belong to a kind of completely new carburized gears steel grade.
The present invention solves the above problems used technical solution are as follows: a kind of high-hardenability carburized gears 20CrNiB steel,
It is characterized by: the chemical component of the product is designed as C:0.17~0.23%, Si :≤0.35%, Mn by mass percentage:
0.50~0.95%, Cr:0.85~1.25%, S:0.015~0.030%, P :≤0.025%, Ni:0.15~0.25%, Nb:
0.015~0.035%, B:0.0010~0.0030%, Cu :≤0.20%, Al:0.010~0.050%, Ca :≤
0.0005%, surplus is Fe and inevitable impurity element.
Further, Cr:1.1~1.25%, B:0.0015~0.0030%.
Further, S:0.020~0.030%.
Further, Ni:0.18~0.25%, Nb:0.02~0.035%.
Based on the bar that the design of the above ingredient is gone out using continuous casting and rolling production, it is different from the prior art, the protrusion having
Performance is that end hardenability meets: J5=42~46HRC, J10=32~36HRC, the metallographic structure of hot-strip are uniform
Ferrite and pearlite, grain size reach 7.0 grades.
The corresponding main function of gear steel chemical composition each element of the present invention and design considerations are:
C is element most basic in steel and most economical intensified element.In all elements, carbon improves hardness of steel
Ability is maximum, and carbon is to 18 times that the reinforcing of quenched and tempered steel is about 9 times of chromium and manganese, so to guarantee gear wheel carburization and quenching
Center portion has good obdurability after tempering, and suitable carbon content has been needed in steel, and carbon content range of the present invention is determined as 0.17-
0.23%, belong to case hardening steel.
Si can be used as deoxidant element and basic solution strengthening element, improve harden ability, while Si is in steel carburizing
It will cause infiltration layer internal oxidition and influence remained austenite content, therefore the range of Si content is determined as≤0.35%.
Mn plays solution strengthening effect to steel, and improves the harden ability of steel strongly, determines that composition range is using the characteristics of Mn
0.50~0.95%.
Cr can increase the harden ability of steel and play the role of post-curing, can play solution strengthening effect to steel, improve quenching for steel
Permeability.In addition Cr reduces the activity of C, can reduce the overheat tendency and skin decarburization speed of steel, but excessively high Cr can be substantially reduced
The range of Cr content is determined as 0.85~1.25% by the toughness of Q-tempering steel, taking into account the above, the present invention.
Ni reinforced ferrite and refines pearlite in steel, and total effect is to improve intensity, to the shadow of the plasticity of steel, toughness
Sound is not significant.In addition Ni also improves effect to the harden ability of steel.The range of Ni content of the present invention is determined as 0.15~
0.25%.
Nb can increase steel belt roof bolt stability, there is post-curing effect.Micro niobium can not influence the plasticity or tough of steel
Property in the case where improve steel intensity.Niobium exists in steel with carbide form, and refines crystal grain.The range of Nb content of the present invention
It is determined as 0.015~0.035%.
Main function of the B in steel is the harden ability for increasing steel, to save other noble metals, content generally exists
In 0.0010~0.0050% range, it can substitute 0.2% molybdenum.The range of B content of the present invention is determined as 0.0010~
0.0030%.
The cutting ability of steel can be improved in the addition of S, but steel can be made to generate red brittleness, reduces the plasticity and toughness of steel, therefore really
Determining S content range is 0.015-0.030%.
Al is added as deoxidant element in steel, and in addition in order to reduce the dissolved oxygen in molten steel, Al and N forms dispersed and tiny
Aluminum nitride particle can refine crystal grain, but Al content is big, and the brittle inclusions such as Al2O3, drop are easily formed during molten steel
Low Molten Steel Cleanliness.The range of Al content of the present invention is determined as≤0.010-0.050%.
Ca content will increase the quantity and size of the dotted oxide of large scale in steel, simultaneously because dotted oxide hardness
Height, plasticity is poor, and in steel deformation, its is indeformable, is easy to form gap at interface, the fatigue behaviour of steel is made to be deteriorated.The present invention
The range of Ca content is determined as≤0.0005%.
Pinion steel of the present invention by conventional gear steel on the basis of 20Cr by addition B, Nb, Ni element, while it is appropriate
High-Cr is mentioned, the harden ability of material and the stability of austenite grain are significantly improved, the grain size of product has reached 7.0
Grade, optimization design meet the high-hardenability requirement of speed changer pinion steel, competitiveness and promotion price with preferable market
Value.
For the present invention compared with existing 20Gr, SCr420, alloying element is simple, easily controllable, has stabilized and increased material
Harden ability.By refining the content of the particle element of crystal grain in control steel, prevents austenite grain in carburizing process from growing up, mention
The high Coarsening Temperature of this crystal grain of Ovshinsky ensure that the prolonged high-temperature carburizing of transmission gear treated crystal grain refinement.
The application is additionally provided with the manufacturer for matching the high-hardenability carburized gears 20CrNiB steel of the chemical component
Production procedure: method by the chemical element component composition configuration raw materials for metallurgy of the steel, sequentially adds pretreated molten iron and steel scrap
Refining at the beginning of → electric furnace → LF furnace refining → VD furnace vacuum outgas → continuous casting continuous casting billet (300 × 340mm or more) → slab slow cooling → casting
Detections-the storages such as base ball blast → heating → high-pressure water descaling → tandem rolling → bar slow cooling → ultrasonic examination+surface inspection.
Key step is as follows
(1) electric furnace just refines: at the beginning of being fitted into according to component ratio by raw material in furnace, being powered and to be aided with oxygen blast fluxing, work as melting
The content of terminal C in 0.02-0.10%, tapped using EBT sled mechanism shelves slag, tapped at 1650-1680 DEG C by liquid steel temperature
The strong deoxidation of Cheng Caiyong is simultaneously partially-alloyed；
(2) LF refining: being hung to LF refining furnace for just refining steel ladle driving, connects Bottom Argon Blowing Device, and power transmission add again
Slag making materials and diffusion deoxidizer is added in heat in the process, makes white slag, controls basicity of slag in 2.0-2.5 preferably to guarantee steel
In [S] control in 0.015-0.030%, refining time is greater than 30 minutes；Argon stirring intensity and each operation in refining process
Purpose is related, but stirring intensity is advisable with not exposed molten steel, when ingredient suitable, the bull ladle to VD that fully enters specification requirement, temperature
Furnace processing；
(3) VD deaerates: the steel ladle driving of refining being hung in VD tank, connects Ar tracheae, and cover vacuum cover, is taken out true
Sky keeps degassing time of the molten steel at condition of high vacuum degree (133Pa) to be no less than 15 minutes；
(4) continuous casting: the steel ladle after VD is deaerated is hung to continuous caster turret, pours whole holding casting after steel, control
15-30 DEG C of the Metal in Tundish degree of superheat is automatically controlled, crystallization using the casting of 0.55-0.80m/min perseverance pulling rate, mold liquid level
Device electromagnetic agitation, end electromagnetic agitation, slighter compress technological measure obtain qualified continuous casting billet；
(5) it rolls: continuous casting billet being reheated to 1180-1270 DEG C, 3-8 hours is kept the temperature, it is rolled later, is cast
Simultaneously slow cooling is collected in base 1020-1150 DEG C of start rolling temperature after high-pressure water descaling, finishing temperature >=850 DEG C in time after rolling.
Specifically, in step 2, slag condition adds part lime, fluorite slag making, slag in reduction process in LF furnace power transmission backsight furnace
Face is added C powder, FeSi powder, SiC powder or aluminium powder and is diffused deoxidation, and reinforces molten steel with the method for feeding Al line and force deoxidation.
The application uses controlled rolling, controls start rolling temperature and finishing temperature, obtain the stable ferrite of grain size and
Pearlitic structrure.
Compared with the prior art, the advantages of the present invention are as follows: by reasonably optimizing chemical component, meet pinion steel
The requirement of high-hardenability and high-strength tenacity, while grain size control is more stable than 20Cr, SCr420, belongs to a kind of completely new infiltration
Carbon gear steel grade.
Specific embodiment
Present invention is further described in detail with reference to embodiments.
Embodiment 1
The production technology of 20CrNiB gear steel bar is as follows:
By the chemical element component composition configuration raw materials for metallurgy of the steel, sequentially adds pretreated molten iron and preferably give up
Refining at the beginning of steel → electric furnace → LF furnace refining → VD furnace vacuum outgas → 300 × 340mm of continuous casting continuous casting billet → slab slow cooling → slab is thrown
The detection such as ball → continuous-type furnace heating → high-pressure water descaling → tandem rolling → bar slow cooling → ultrasonic examination+surface inspection-
Storage.
Specific production stage is as follows:
1) pretreated molten iron accounts for 30-50% in feed stock for blast furnace, remaining is steel scrap；
2) key point of electric furnace smelting and tapping process controls: carrying out terminal tapping carbon control, terminal tapping carbon to electric furnace
Not less than 0.05%, molten steel oxidation is prevented；Using eccentric furnace bottom and steel is stayed to tap, prevents lower oxidizing slag；
3) LF furnace refines: slag condition adds part lime, fluorite slag making in LF furnace power transmission backsight furnace, and the top of the slag adds in reduction process
Enter C powder, FeSi powder, SiC powder or aluminium powder and be diffused deoxidation, and reinforce molten steel with the method for feeding Al line and force deoxidation, controls furnace
Basicity of slag in 2.0-2.5 to control [S] in steel control in 0.015-0.030%, refining time 20 minutes.During LF refining
Argon stirring intensity is related to each operation purpose, but stirring intensity is advisable with not exposed molten steel.It is wanted when ingredient fully enters specification
Ask, temperature it is suitable, bull ladle to VD furnace processing.
4) VD vacuum outgas: the steel ladle driving that step (2) complete refining being hung in VD tank, Ar tracheae is connected, and
Vacuum cover is covered, is vacuumized, is greater than 15 minutes in condition of high vacuum degree (133Pa) the lower retention time；Steel in furnace is observed under condition of high vacuum degree
Water boiling situation appropriate adjustment Argon pressure and flow break sampling analysis after sky, and adjusting component enters standard based on the analysis results
Range.
5) continuous casting: the steel ladle after VD is deaerated is hung to continuous caster turret, and total process protective is cast after casting, and is adopted
With crystallizer, secondary cooling zone electromagnetic agitation and soft reduction technique.The target control of the continuous casting steel degree of superheat is at 15~30 DEG C, casting speed control
In 0.55-0.80m/min, improve internal soundness.
6) 550 DEG C of continuous casting billet or more high temperature are offline, enter burial pit heat preservation 48 hours or more, casting blank cleavage prevented, by slow cooling
Continuous casting billet Shot Blasting afterwards improves its surface quality, the generation of surface genetic defects when reducing slab milling round steel.
7) it rolls:
Firstly, continuous casting billet is heated to 1180-1270 DEG C in the heating furnace of less oxidizing atmosphere, 3-8 hours are kept the temperature, is come out of the stove
Slab removes iron scale through high-pressure water descaling processing high temperature afterwards；1020-1150 DEG C of start rolling temperature, 850-980 DEG C of finishing temperature.
It is collected in time after rolling and is incorporated to hole slow cooling.
In order to sufficiently prove the significant performance of the application product, using pinion steel 20Cr material as reference example 2, with pinion steel
SCr420H material is as reference example 3.
1) difference of chemical component is referring to table 1 (wt%)
Table 1
| Project | C | Si | Mn | P | S | Cr | Ni | Nb | Al | B |
| 1 20CrNiB of embodiment | 0.21 | 0.22 | 0.89 | 0.011 | 0.02 | 1.18 | 0.18 | 0.021 | 0.032 | 0.0017 |
| 2 20Cr of reference example | 0.2 | 0.25 | 0.75 | 0.013 | 0.012 | 1.02 | 0.02 | 0.0004 | 0.028 | 0.0002 |
| Reference example 3SCr420 | 0.21 | 0.26 | 0.82 | 0.015 | 0.011 | 1.04 | 0.01 | 0.0006 | 0.029 | 0.0003 |
2) difference of grain size is as follows
Embodiment 1 is 7.0 grades, and 2 20Cr of reference example is 6.0 grades, reference example 3SCr420H is 6.0 grades.
3) end hardenability: referring to table 2
Table 2
| Project | J5, HRC | J10, HRC |
| 1 20CrNiB of embodiment | 44.5 | 33 |
| 2 20Cr of reference example | 38 | 27 |
| Reference example 3SCr420 | 40 | 28 |
By comparison it is found that the embodiment 1 based on the present application thinking compares 20Cr, SCr420H material, have higher
End hardenability, grain size is thinner, have higher intensity.
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments
The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.
Claims (10)
1. a kind of high-hardenability carburized gears 20CrNiB steel, it is characterised in that: the chemical component of the product is by mass percentage
It is designed as C:0.17~0.23%, Si :≤0.35%, Mn:0.50~0.95%, Cr:0.85~1.25%, S:0.015~
0.030%, P :≤0.025%, Ni:0.15~0.25%, Nb:0.015~0.035%, B:0.0010~0.0030%, Cu:
≤ 0.20%, Al:0.010~0.050%, Ca :≤0.0005%, surplus is Fe and inevitable impurity element.
2. high-hardenability carburized gears 20CrNiB steel according to claim 1, it is characterised in that: the chemistry of the product
In ingredient, Cr:1.1~1.25%, B:0.0015~0.0030%.
3. high-hardenability carburized gears 20CrNiB steel according to claim 1, it is characterised in that: the chemistry of the product
In ingredient, S:0.020~0.030%.
4. high-hardenability carburized gears 20CrNiB steel according to claim 1, it is characterised in that: the chemistry of the product
In ingredient, Ni:0.18~0.25%, Nb:0.02~0.035%.
5. high-hardenability carburized gears 20CrNiB steel according to claim 1, it is characterised in that: use continuous casting and company
The bar produced is rolled, end hardenability meets: J5=42~46HRC, J10=32~36HRC, the metallographic group of hot-strip
It is woven to uniform ferrite and pearlite, grain size reaches 7.0 grades.
6. a kind of method of high-hardenability carburized gears 20CrNiB steel described in manufacturing claims 1, it is characterised in that: pressing should
The chemical element component composition configuration raw materials for metallurgy of steel, refining → LF furnace at the beginning of sequentially adding pretreated molten iron and steel scrap → electric furnace
Refining → VD furnace vacuum outgas → continuous casting continuous casting billet → slab slow cooling → slab ball blast → heating → high-pressure water descaling → tandem rolling →
Bar slow cooling.
7. the manufacturing method of high-hardenability carburized gears 20CrNiB steel according to claim 6, it is characterised in that: main
Want that steps are as follows
(1) electric furnace just refines: at the beginning of being fitted into according to component ratio by raw material in furnace, being powered and to be aided with oxygen blast fluxing, as melting terminal C
Content in 0.02-0.10%, liquid steel temperature is tapped, tapping process adopts at 1650-1680 DEG C using EBT sled mechanism shelves slag
With strong deoxidation and partially-alloyed；
(2) LF refining: first refining steel ladle driving is hung to LF refining furnace, connects Bottom Argon Blowing Device, power transmission is reheated, mistake
Slag making materials and diffusion deoxidizer are added in journey, makes white slag, controls basicity of slag in 2.0-2.5 preferably to guarantee in steel
[S] control is greater than 30 minutes in 0.015-0.030%, refining time；Argon stirring intensity and each operation purpose in refining process
Correlation, but stirring intensity is advisable with not exposed molten steel, when to fully enter specification requirement, temperature suitable for ingredient, at bull ladle to VD furnace
Reason；
(3) VD deaerates: the steel ladle driving of refining is hung in VD tank, Ar tracheae is connected, and cover vacuum cover, vacuumizes,
Degassing time of the molten steel under condition of high vacuum degree is kept to be no less than 15 minutes；
(4) continuous casting: the steel ladle after VD is deaerated is hung to continuous caster turret, pours whole holding casting after steel, and control is intermediate
It 15-30 DEG C of baotou steel water superheat, is automatically controlled using the casting of 0.55-0.80m/min perseverance pulling rate, mold liquid level, crystallizer electricity
Magnetic stirring, end electromagnetic agitation, slighter compress technological measure obtain qualified continuous casting billet；
(5) it rolls: continuous casting billet being reheated to 1180-1270 DEG C, 3-8 hours is kept the temperature, it is rolled later, slab warp
Simultaneously slow cooling is collected in 1020-1150 DEG C of start rolling temperature after high-pressure water descaling, finishing temperature >=850 DEG C in time after rolling.
8. the manufacturing method of high-hardenability carburized gears 20CrNiB steel according to claim 6 or 7, it is characterised in that:
In continuous casting working procedure, the specification of continuous casting billet is 300 × 340mm or more.
9. the manufacturing method of high-hardenability carburized gears 20CrNiB steel according to claim 7, it is characterised in that: step
In rapid 3, the vacuum degree of VD vacuum is 133Pa or less.
10. the manufacturing method of high-hardenability carburized gears 20CrNiB steel according to claim 7, it is characterised in that: step
In rapid 2, slag condition adds part lime, fluorite slag making in LF furnace power transmission backsight furnace, in reduction process the top of the slag be added C powder, FeSi powder,
SiC powder or aluminium powder are diffused deoxidation, and reinforce molten steel with the method for feeding Al line and force deoxidation.
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Application publication date: 20190212 |