CN106119511B - 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical - Google Patents
9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical Download PDFInfo
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- CN106119511B CN106119511B CN201610798951.7A CN201610798951A CN106119511B CN 106119511 B CN106119511 B CN 106119511B CN 201610798951 A CN201610798951 A CN 201610798951A CN 106119511 B CN106119511 B CN 106119511B
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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
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
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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
- 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
- C22C38/12—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
- C22C38/18—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
- C21D2221/00—Treating localised areas of an article
- C21D2221/10—Differential treatment of inner with respect to outer regions, e.g. core and periphery, respectively
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Abstract
The invention discloses a kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical, belong to smoothing roll manufacture field.The smoothing roll heat treatment method of the present invention, is sealed using quenching frock to the centre bore and end face of the body of roll, and sets flatulence circle between top board and clamp nut, so as to form effective sealing；When carrying out Quenching Treatment, first the body of roll is preheated, then the high-temperature gas in centre bore discharged, then the body of roll is heated；Hoisting type water quenching repeatedly is first used during quenching, then immerses cooling in fluid, multiple temper is finally carried out.The present invention makes to produce negative pressure in body of roll centre bore, and hardening media cannot be introduced into end face and centre bore, and body of roll firmness outside is high after quenching, and internal toughness is good, effectively avoids the generation of crackle.
Description
Technical field
The present invention relates to smoothing roll processing technique field, more specifically to a kind of based on exhaust quenching technical
9Cr2Mo smoothing roll heat treatment methods.
Background technology
Straightener is the plant equipment that aligning processing is carried out to section bar, bar, and its smoothing roll is critical component.For large-scale
For smoothing roll, it is relatively large in diameter, and outer surface requires there is higher hardness, and center portion needs to keep preferable toughness, therefore how
The heat treatment of smoothing roll is carried out, key technology during as production and processing.
For current smoothing roll, no matter roll neck size, in order to improve its combination property, it is necessary to carry out integral quenching
Fire.For the concrete application of different material and smoothing roll, selection water quenching that can be appropriate or oil quenching.For oil quenching, it is unsuitable for table
Surface hardness requires higher smoothing roll；For water quenching, because its cooling is excessively fierce, cracking is easy to for some materials.But
No matter which kind of integral quenching mode is used at present, the problem of all there is end face or overall cracking, particularly in grinding stage, table
Face can have annular crack, and the crackle is also difficult to eliminate by grinding, can only carry out surface reconditioning.And it is more serious for ftractureing
Workpiece, directly scrap, cause product qualification rate extremely low.
Entered Exploring Analysis discovery, if to there is preferable performance, smoothing roll endoporus and end face can not carry out direct quenching,
Particularly in the junction of endoporus and end face, once touching hardening media, concentrated stress will be formed in junction, during the later stage
During effect processing, it is easy to ftracture.Therefore, the key of problem is how to carry out quenching protection to the endoporus and end face of smoothing roll.
Found by retrieval, it is middle in the prior art to there is related solution, such as number of patent application：ZL
200610106957.X, authorized announcement date：On July 8th, 2009, the patent formula discloses a kind of biliquid of 9Gr2Mo smoothing rolls
Quenching process, it prevents hardening media from entering endoporus by filling loess in the gap location of smoothing roll endoporus and frock
It is interior, and end face and endoporus are covered with pressing plate, quickly cooled down first with water quenching, austenite decomposition is prevented, then again in oil bath
Quenched, reduce quenching distortion, prevent cracking.
It is this to fill other materials in smoothing roll endoporus to prevent the method that medium enters from more being commonly used at present, for
Prevent from deforming and ftracture with certain effect.But inside stuffing can influence temperature, it is necessary to before tempering in tempering
Filler is removed, tedious process.But if without filler, be difficult to be prevented effectively from shadow of the hardening media to quenching effect again
Ring, cause manufacturing procedure to be contradicted with processing effect.
The content of the invention
1. the invention technical problem to be solved
It is an object of the invention to overcome the shortcomings of in the prior art smoothing roll after quenching easily occur crackle there is provided
A kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical, the present invention is exhausted processing, made after preheat
Negative pressure is produced in body of roll centre bore, hardening media cannot be introduced into end face and centre bore, body of roll firmness outside is high after quenching, it is internal
Good toughness, effectively avoids the generation of crackle.
2. technical scheme
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
A kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical of the present embodiment, contained by smoothing roll blank
Component and its percentage by weight are：C：0.8~0.9%, Si：0.20~0.30%, Mn：0.22~0.38%, Cr：1.8~
2.2%th, Mo：0.35~0.42%, P≤0.02, S≤0.02, remaining is iron and inevitable impurity；The material by forging and
It is heat-treated after machining, row quenching protection is put into using quencher in heat treatment process, its handling process is：
1) body of roll after machining is inserted in the suspension rod of quenching frock, top board and flatulence is set in body of roll upper end
Circle, and the filled high-temperature cotton between adjacent two part, seal the two ends of the body of roll by clamp nut；Install and hang in suspension rod upper end
The body of roll, is hung in heating furnace by hook；
2) 580~650 DEG C are warming up to stove, are incubated 1~3 hour；
3) body of roll is hung out, unscrews clamp nut and be exhausted, then tighten clamp nut, by the body of roll hang in heating furnace after
Continuous heating；Its exhaust process is：
A, the body of roll is hung out after, unscrew clamp nut；
B, slowly rotate top board, the discharge of centre bore inner high voltage gas；
C, clamp nut is screwed again, then the body of roll is hung in heating furnace and continues to heat；
4) 860~900 DEG C are heated to, 3~5 hours are incubated, the body of roll is then hung out and carries out Quenching Treatment；
5) step 4) quenching after the completion of carry out 2~3 tempers.
Further, the downrod lower end of the quenching frock, which is connected with baffle plate, suspension rod, is set with lower platen, in use,
The both sides of lower platen are filled with high temperature cotton；Suspension rod middle and upper part is provided with external screw thread, and top board and flatulence circle are sleeved on suspension rod
On, clamp nut is threadedly coupled with suspension rod, in the equal filled high-temperature cotton in the both sides up and down and flatulence circle inner chamber of top board and flatulence circle.
Further, the side wall of the clamp nut offers bayonet socket, and the bayonet socket is distributed along clamp nut radial symmetric.
Further, pull bar or draw ring are provided with the top board, for lifting top board exhaust.
Further, the suspension rod upper end is provided with internal thread, for connecting shackle.
Further, step 3) in exhaust process completed in 10 minutes.
Further, step 4) in Quenching Treatment process be：The body of roll from heating furnace hang out after be put into cooling water, 2~5
Sling after minute, cooling in atmosphere is placed into cooling water for 2~6 minutes, so repeatedly 3~5 times；Then the body of roll is hung in oil
Cooled down in liquid.
Further, step 4) in when being quenched, the body of roll from heating furnace hang out after be put into cooling water, after 2~5 minutes
Sling, cooling in atmosphere is placed into cooling water for 2~6 minutes, so repeatedly 3~5 times；Then the body of roll is immersed in cooling water
Cooled down.
Further, step 5) in drawing process be：It is tempered at 180~200 DEG C, is incubated 9~12 hours；Then
Carry out 180~190 DEG C of temperature, the lonneal for being incubated 6~8 hours twice.
3. beneficial effect
The technical scheme provided using the present invention, compared with prior art, is had the advantages that：
(1) 9Cr2Mo smoothing roll heat treatment methods of the invention, coordinate suspension rod to be sealed using top board and flatulence circle,
Pressing plate can prevent hardening media from entering in end surface of roll and centre bore, so as to avoid the hardenability inside the body of roll；Carrying out
During heating, first preheated, heated again after exhaust, can further improve sealing；Because gas in body of roll centre bore
Air pressure increase, is sealed, then when being quenched, centre bore is internally formed negative pressure after exhaust after heated, make top board with
Lower platen is tightly attached to end surface of roll, and hardening media cannot be introduced into, so as to be protected to end surface of roll and centre bore formation；
(2) 9Cr2Mo smoothing roll heat treatment methods of the invention, by flatulence circle filled high-temperature cotton have it is more preferable
Sealing effectiveness because conventional seals are directly to be tightened on pressing plate with bolt mostly, and screw thread is quenched in itself and without sealing
Fiery medium is easy to enter centre bore by the gap between screw thread, and flatulence circle and high temperature cotton are added in the present invention, high temperature
Cotton can fill up thread gaps, so that hardening media can not penetrate into, it is ensured that there is preferable quenching effect；
(3) 9Cr2Mo smoothing roll heat treatment methods of the invention, are first put into the body of roll in cooling water again when being quenched
Lift, by repeatedly operating repeatedly, improve body surface hardness, then carrying out oil cooling, reducing the quenching distortion of the body of roll,
It effectively prevent body of roll cracking, it is ensured that there is preferable toughness body of roll center；
(4) 9Cr2Mo smoothing roll heat treatment methods of the invention, carry out multiple low-temperature tempering after quenching, be incubated at least six
Hour, the case hardness of smoothing roll is adjusted to setting with lonneal, lonneal is more abundant, the toughness inside smoothing roll
Better, thermal crack resistant ability is higher.The increase of molybdenum content causes to contain more retained austenite, big portion after tempering after quenching in steel
Divide retained austenite to be changed into new martensite again, be thus favorably improved roll hardness, strengthening wearability simultaneously reduces wear surface
Roughness, repeatedly tempering can eliminate the cutting stress formed in finishing passes, fully ensure that its toughness.
Brief description of the drawings
Fig. 1 is quenching technical flow chart of the invention；
Fig. 2 is the structural representation of quenching frock in the present invention；
Fig. 3 sets the structural representation of cylindrical bar for top board in the present invention.
Label declaration in schematic diagram：1st, baffle plate；2nd, lower platen；3rd, the body of roll；4th, top board；5th, flatulence circle；6th, high temperature cotton；
7th, clamp nut；8th, bayonet socket；9th, suspension rod.
Embodiment
To further appreciate that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
In a kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical of the present embodiment, 9Cr2Mo smoothing rolls
Contained component and its percentage by weight are：C：0.85%th, Si：0.23%th, Mn：0.28%th, Cr：2.1%th, Mo：0.40%th, P≤
0.02nd, S≤0.02, remaining is iron and inevitable impurity.The material is heat-treated after forging and be machining,
In heat treatment process row quenching protection is put into using quencher.
With reference to Fig. 2, the quenching frock used in the present embodiment, including suspension rod 9, lower platen 2, top board 4 and flatulence circle 5,
The lower end of suspension rod 9 is connected with baffle plate 1, suspension rod 9 and is set with lower platen 2, in use, the both sides of lower platen are filled with high temperature cotton 6,
For sealing.The middle and upper part of suspension rod 9 is provided with external screw thread, and top board 4 and flatulence circle 5 are sleeved on suspension rod 9, the body of roll 3 are set with
On suspension rod 9, and positioned between lower platen 2 and top board 4, clamp nut 7 is threadedly coupled with suspension rod 9, by clamp nut 7
Flatulence circle 5 and top board 4 are pressed on the upper surface of the body of roll 3, so as to form sealing, the end face and centre bore of the body of roll 3 are capped, and are protected
Demonstrate,proving the end face and centre bore of smoothing roll will not be cooled quenching.In order to improve sealing property, in the upper of top board 4 and flatulence circle 5
The lower equal filled high-temperature cotton 6 in both sides and the inner chamber of flatulence circle 5, i.e., between the upper surface of the body of roll 3 and top board 4, top board 4 and flatulence circle
Filled high-temperature cotton 6, and in the inside filled high-temperature cotton 6 of flatulence circle 5 between 5, between flatulence circle 5 and clamp nut 7.
Common press-loading apparatus is the fixation clip directly on body of roll upper surface mostly, then hardening media is easy to by screw thread
Penetrate into centre bore, after filled high-temperature cotton 6, it is ensured that sealing effectiveness.The upper end of suspension rod 9 is provided with internal thread, for connecting shackle.
It is structure as a whole if suspension hook is set with suspension rod, then the body of roll 3 can only be set with from the lower end of suspension rod 9, is unfavorable for subsequent exhaust behaviour
Make.
By the quenching frock, it is to the quenching processing technology of smoothing roll：
1) body of roll 3 is inserted in suspension rod 9, top board 4 and flatulence circle 5 is set in the upper end of the body of roll 3, and filled out between adjacent two part
High temperature cotton 6 is filled, the two ends of the body of roll 3 are sealed by clamp nut 7；Suspension hook is installed in the upper end of suspension rod 9, the body of roll 3 is put into heating
Stove；
It is inserted in after the body of roll 3, first in the populated high temperature cotton in the both sides of lower platen 2, then again in the upper end of suspension rod 9 on the body of roll 3
End winds high temperature cotton, is screwed off top board 4 around high temperature cotton winding direction, is spread between top board 4 and the upper surface of the body of roll 3
If high temperature cotton；Then flatulence circle 5 is screwed off around high temperature cotton winding direction, high temperature cotton is laid between flatulence circle 5 and top board 4；
Clamp nut 7 is finally screwed in, does not have high temperature cotton between clamp nut 7 and the external screw thread of suspension rod 9, but in clamp nut 7 and flatulence
Laying high temperature cotton 6 between circle 5.
2) 580~650 DEG C are warming up to stove, are incubated 1~3 hour；
First 580~650 DEG C are heated to the body of roll 3 to preheat, due to the material of the body of roll 3 and of different sizes, therefore temperature
Setting is different, and general roll neck is smaller, and heating is faster, and preheating temperature is lower, and soaking time is also shorter, and the main purpose of insulation is
Ensure that centre bore temperature is also sufficiently high, air has pressure because of expansion in centre bore.
3) body of roll 3 is hung out, unscrews clamp nut 7 and be exhausted, then tighten clamp nut 7, the body of roll 3 is hung in into heating
Stove continues to heat；
The operation of its exhaust process is as follows：
A, the body of roll 3 is hung out after, unscrew clamp nut 7；
B, slow rotation top board 4, rotational angle are less than 90 °, the discharge of centre bore inner high voltage gas；
C, clamp nut 7 is screwed again, then the body of roll 3 is hung in heating furnace and continues to heat.
Whole exhaust process control was completed in 10 minutes, it is to avoid the excessive drop temperature of the body of roll 3 starts hardening.After the body of roll 3 melts down
Continue to be heated to hardening heat, actual temp can be set according to actual needs.Because in heating and quenching, the body of roll is with pressing
The expansion of plate and suspension rod, shrinkage factor are different, are easily caused medium entrance, and flatulence circle 5 elasticity of itself can be carried out to deformation
Compensation, so as to ensure whole process central hole in sealing state.
4) 860~900 DEG C are heated to, insulation is hung out for 3~5 hours carries out Quenching Treatment after the body of roll 3；
The hardness that specifically quenching mode can be according to actual needs is adjusted, and is not limited specifically.In order to reach compared with
Good hardness and toughness, can carry out Quenching Treatment using water, the double modes of quenching of oil.Specifically, put after the body of roll 3 being hung out from heating furnace
Enter in cooling water, surface temperature reduction is sling after 2~5 minutes；Internal temperature is outwards transmitted, and is cooled down 2~6 minutes in atmosphere
Place into cooling water, so repeatedly 3~5 times；The outside of the body of roll 3 obtains higher hardness, then the body of roll 3 is hung in fluid
Row cooling completely.
After Quenching Treatment, the firmness outside of the body of roll 3 reaches that middle part hardness is about HRC33~38 up to HRC58~65,
Hardness is about HRC23~35 at center bore inner wall, it can be seen that hardness ecto-entad is gradually reduced.Wherein water quenching purpose, which is mainly, carries
High surface hardness, body of roll inner hardness is also improved after oil quenching.Because centre bore is sealed, close to slow at kernel of section
It is cold, preferable toughness can be kept.
5) 2~3 tempers are carried out after quenching.
Drawing process is：It is tempered at 180~200 DEG C, is incubated 9~12 hours；Then carry out twice temperature 180~
190 DEG C, the lonneal for being incubated 6~8 hours.
By temper, it is equalized internal stress, after temper, the firmness outside of the body of roll 3 is reached up to HRC56
~62, middle part tissue hardness be about at HRC30~35, center bore inner wall hardness be about HBC210~240.Although firmness change is not
Greatly, but preferably stress concentration phenomenon is eliminated, it is to avoid the generation of crackle.In drawing process, mainly making should inside the body of roll
Power is eliminated, and can be misaligned heart hole and be sealed.
Chromium (Gr) can increase the quenching degree of steel and have post-curing effect, can improve the hardness and wearability of steel without making steel
Become fragile；In multiple drawing process, Cr and Mo content sum are 2.2~2.5%, and the collective effect of chromium and molybdenum makes quenching for steel
Fiery hardness is with less value changes.The change is related with temperature to the number of times being tempered, if simply in the temperature range,
Number of times is not enough, and the either time is too short, and it is insufficient to be all easily caused tempering, is on the one hand that stress is not eliminated fully, on the other hand
Cause hardness unqualified, the too high or too low service life for being all unfavorable for improving smoothing roll.
Manganese (Mn) is important alloying element in steel, can form the alloyed cementite containing manganese, when can reduce perlitic transformation
The forming core and long speed of alloyed cementite are waited, quenching degree is improved；Meanwhile, manganese is austenite former again, turn of reduction pearlite
Temperature, so the content of increase manganese can hinder the transformation of pearlite, is conducive to the reduction of pearlite synusia spacing.
Embodiment 2
It is 1~5mm that the semidiameter between top board 4, lower platen 2 and suspension rod 9 is controlled in the present embodiment, contributes to high temperature cotton
Sealing filling, if gap is excessive, high temperature cotton is difficult to fill consolidation, and sealing effectiveness is undesirable.Radius is chosen in the present embodiment
Difference is 2mm.The diameter of lower platen 2 and top board 4 is not less than 0.8 times of the end face diameter of the body of roll 3, so as to the end face of the body of roll
Form protection.
Embodiment 3
The side wall of clamp nut 7 offers bayonet socket 8 in the present embodiment, and the bayonet socket 8 is distributed along the radial symmetric of clamp nut 7.
After being heated to the body of roll 3, workman can not be close, therefore bayonet socket 8 can be blocked by clamp, so as to rotatably compress nut 7.Therefore,
In the step a and step c of exhaust process, clamp or other device card card inlets 8 can be used, so as to rotate release clamp nut
7.Other structures can also be set to aid in the rotation of clamp nut 7, such as protrusion fixture block, neck, be not specifically limited.
Embodiment 4
Pull bar is set on top board 4 in the present embodiment, as shown in figure 3, the pull bar is cylindrical bar, radial symmetric is arranged on
The upper surface of top board 4, is vented for lifting top board 4.Cylindrical bar can be entangled in step b with steel pipe, is then rotated.
In addition, step 4) in when being quenched, the body of roll 3 from heating furnace hang out after be put into cooling water, hung after 2~5 minutes
Rise, cooling in atmosphere is placed into cooling water for 2~6 minutes, so repeatedly 3~5 times；Then the body of roll 3 is immersed in cooling water
Cooled down.
When putting into row Quenching Treatment using unskilled labor, although inside is filled with solid filler, but it is difficult to prevent quenching to be situated between
Matter is penetrated under pressing plate or out of screw thread, so can touch hardening media more than at centre bore and end contact, and is not had
There is preferable temperature drop safeguard measure, cause centre bore and end face junction Cooling Quenching, form stress concentration, in tempering also very
Difficulty is eliminated stress, then just causes the body of roll to be easy to crack in this place, or even straight knot cracking.
And the present invention puts into row Quenching Treatment using quencher, on the one hand, coordinate high temperature cotton to be sealed using flatulence circle,
The body of roll is thermally deformed and compensated, sealing effectiveness is improved；On the other hand, carry out producing in pump-down process, centre bore in technique
Raw negative pressure, by external pressure come auxiliary seal, can prevent medium from entering, further improve sealing effectiveness, it is ensured that in the body of roll
Toughness at the heart, can effectively prevent stress concentration, it is to avoid smoothing roll ftractures.
Schematical above that the present invention and embodiments thereof are described, the description does not have restricted, institute in accompanying drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited thereto.So, if the common skill of this area
Art personnel are enlightened by it, without departing from the spirit of the invention, are designed and the technical scheme without creative
Similar frame mode and embodiment, all should belong to protection scope of the present invention.
Claims (9)
1. a kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical, it is characterised in that：Contained by smoothing roll blank
Component and its percentage by weight are：C：0.8~0.9%, Si：0.20~0.30%, Mn：0.22~0.38%, Cr：1.8~
2.2%th, Mo：0.35~0.42%, P≤0.02%, S≤0.02%, remaining is iron and inevitable impurity；The material is by forging
Make with it is machining after be heat-treated, in heat treatment process using quencher put into row quenching protect, its handling process
For：
1) body of roll (3) after machining is inserted on the suspension rod (9) of quenching frock, suspension rod (9) and is set with lower platen (2),
Top board (4) and flatulence circle (5) are set in the body of roll (3) upper end, top board (4) and flatulence circle (5) are sleeved on suspension rod (9),
The body of roll (3) is located between lower platen (2) and top board (4), and the filled high-temperature cotton (6) between adjacent two part, in suspension rod (9) on
Portion is provided with external screw thread, and clamp nut (7) is threadedly coupled with suspension rod (9), by clamp nut (7) that the two ends of the body of roll (3) are close
Envelope；Suspension hook is installed in suspension rod (9) upper end, the body of roll (3) is hung in heating furnace；
2) 580~650 DEG C are warming up to stove, are incubated 1~3 hour；
3) body of roll (3) is hung out, unscrews clamp nut (7) and be exhausted, then tighten clamp nut (7), the body of roll (3) is hung in
Heating furnace continues to heat；Its exhaust process is：
A, the body of roll (3) is hung out after, unscrew clamp nut (7)；
B, slowly rotation top board (4), the discharge of centre bore inner high voltage gas；
C, clamp nut (7) is screwed again, then the body of roll (3) is hung in heating furnace and continues to heat；
4) 860~900 DEG C are heated to, 3~5 hours are incubated, the body of roll (3) is then hung out and carries out Quenching Treatment；
5) step 4) quenching after the completion of carry out 2~3 tempers.
2. a kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical according to claim 1, its feature
It is：Suspension rod (9) lower end of the quenching frock, which is connected with baffle plate (1), suspension rod (9), is set with lower platen (2), in use,
The both sides of lower platen are filled with high temperature cotton (6)；Suspension rod (9) middle and upper part is provided with external screw thread, top board (4) and flatulence circle (5)
It is sleeved on suspension rod (9), clamp nut (7) is threadedly coupled with suspension rod (9), up and down the two of top board (4) and flatulence circle (5)
The equal filled high-temperature cotton (6) in side and flatulence circle (5) inner chamber.
3. a kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical according to claim 2, its feature
It is：The side wall of the clamp nut (7) offers bayonet socket (8), and the bayonet socket (8) is distributed along clamp nut (7) radial symmetric.
4. a kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical according to claim 2, its feature
It is：Pull bar or draw ring are provided with the top board (4), for lifting top board (4) exhaust.
5. a kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical according to claim 2, its feature
It is：Suspension rod (9) upper end is provided with internal thread, for connecting shackle.
6. a kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical according to claim 1, its feature
It is：Step 3) in exhaust process completed in 10 minutes.
7. a kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical according to claim 1, its feature
It is：Step 4) in Quenching Treatment process be：The body of roll (3) from heating furnace hang out after be put into cooling water, hung after 2~5 minutes
Rise, cooling in atmosphere is placed into cooling water for 2~6 minutes, so repeatedly 3~5 times；Then the body of roll (3) is hung in fluid
Cooled down.
8. a kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical according to claim 1, its feature
It is：Step 4) in when being quenched, the body of roll (3) from heating furnace hang out after be put into cooling water, sling after 2~5 minutes, in sky
Cooling is placed into cooling water for 2~6 minutes in gas, so repeatedly 3~5 times；Then it is cold being carried out in the body of roll (3) immersion cooling water
But.
9. a kind of 9Cr2Mo smoothing roll heat treatment methods based on exhaust quenching technical according to claim 1, its feature
It is：Step 5) in drawing process be：It is tempered at 180~200 DEG C, is incubated 9~12 hours；Then temperature twice is carried out
180~190 DEG C, the lonneal for being incubated 6~8 hours.
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| CN111304516B (en) * | 2020-03-05 | 2021-05-28 | 中天钢铁集团有限公司 | Non-quenched and tempered steel for high-strength high-low-temperature impact toughness lifting hook and production process |
| CN114574671A (en) * | 2022-03-14 | 2022-06-03 | 河南精诚汽车零部件有限公司 | Quantitative speed-control heat treatment process for roller skin of ball press |
| CN117265230B (en) * | 2023-09-01 | 2024-04-02 | 南京年达智能装备科技有限公司 | Intelligent quenching production line suitable for aluminum alloy melting furnace |
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