CN109423581A - A kind of two intermediate calender rolls and its manufacturing method of sendzimir mill - Google Patents
A kind of two intermediate calender rolls and its manufacturing method of sendzimir mill Download PDFInfo
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- CN109423581A CN109423581A CN201710792817.0A CN201710792817A CN109423581A CN 109423581 A CN109423581 A CN 109423581A CN 201710792817 A CN201710792817 A CN 201710792817A CN 109423581 A CN109423581 A CN 109423581A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
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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
-
- 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
- C21D9/38—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
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/44—Carburising
- C23C8/46—Carburising of ferrous surfaces
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
- C23C8/62—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes only one element being applied
- C23C8/64—Carburising
- C23C8/66—Carburising of ferrous surfaces
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Abstract
A kind of two intermediate calender rolls of sendzimir mill, the roller roll body are process by following steel grade, by weight percentage, the steel grade chemical component are as follows: C:0.30-0.50%, Si≤1.00%, Mn≤1.00%, Cr:4.50-5.50%, Ni:0.20-1.00%, Mo:0.60-1.00%, V:0.20-0.50%, W:0.50-1.25%, P≤0.025%, S≤0.025%, remaining is Fe and inevitable impurity.This method includes at least the step of carrying out Deep Carburization Process heat treatment to roller surface working lining after the roll body of mentioned component is forged into base, and it is stepped up carbon content in work layer on surface by the carbon content of center portion matrix to the carbon content on surface from inside to outside, roll surface carbon content range 0.5~1.2% after carburizing.To improve the wearability of two intermediate calender rolls and scratch toughness, extend the service life of such roll.
Description
Technical field
The present invention relates to a kind of sendzimir mill intermediate calender rolls and its manufacturing methods more particularly to silicon steel rolling to use often
20 roller sendzimir mills two intermediate calender rolls and its manufacturing method.
Background technique
Roll is the main parts size of milling train, and to silicon ribbon steel, the general single chassis Sendzimir using 20 rollers is reversible to be rolled
Machine is rolled.By taking certain sendzimir mill as an example, with reference to Fig. 1 and table 1, two intermediate calender rolls can be Φ with roller diameter range in roller system
239- Φ 230mm, roller radius abrasion will be scrapped more than after 4.5mm.Existing two intermediate calender rolls are generally hardened using inside and outside entire body
The production of 5H12 steel, this steel containing 0.5% or so C element, 5% or so Cr elements and 1% or so the elements such as W, Mo.5H12 steel
The coarse primary carbide (being easy crack initiation around it) being directly precipitated from liquid molten steel is generally free of in metallographic structure,
But the second particle carbide for thering is the heat treatment of more rich Dispersed precipitate to be precipitated in tempered martensite matrix, improve material
Expect wearability.Another advantage of this steel is that the process such as forging, heat treatment are not easy the defects of cracking.With silicon
The continuous high speed of steel rolling and to the increasingly strict of silicon ribbon steel surface quality requirement, two intermediate calender rolls of 5H12 steel are in use process
Some problems: (1) wearability relative deficiency are gradually exposed, two intermediate calender rolls use on the machine the time generally only 2 weeks or so, frequently
Roll change substantially increases the use cost of roll；(2) two servo-actuated intermediate roll crown holding capacities are inadequate, to a certain extent
Influence whether the control with steel plate type；(3) under some extreme operating conditions such as disconnected band, steel bonding, two intermediate calender rolls can also be frequently present of stripping
Fall, even fracture etc. major failures accident.
In terms of material, application No. is 201510048820.2 entitled " multi-roll mill middle roller and its manufacturing methods "
Chinese patent literature disclose a kind of multi-roll mill middle roller and its manufacturing method, chemical component and weight percent are such as
Under: carbon 0.80~0.90%, silicon 0.60~1.00%, manganese 0.40~0.60%, chromium 7.00~8.00%, molybdenum 1.80~
2.20%, vanadium 0.40~0.70%, phosphorus≤0.025%, sulphur≤0.010%, remaining be iron and inevitable impurity.The invention
Intermediate calender rolls material is upgraded to 8%Cr rank from 5%Cr rank, while C content is also correspondinglyd increase to 0.8~0.9%, it is desirable to
More wearability metal carbides are obtained, to improve roll body wearability.But due to Cr8 type high-carbon chromium class tool steel continuous casting billet structure
In there are a large amount of Aliquation carbides, increase the difficulty of subsequent forging, be easy to produce crackle around carbide when use and cause to roll
Roller failure, this undoubtedly can more protrude larger-size two intermediate calender rolls problem.
In configuration aspects, application No. is the China of 201520098078.1 entitled " two intermediate calender rolls of lantern ring type flexibility "
Utility model patent discloses a kind of flexible two intermediate calender rolls of lantern ring type, by least one be adjusted axially ring, at least two lantern rings and
One mandrel composition.Each lantern ring hot charging is on the mandrel；It is arranged one between two neighboring lantern ring and is adjusted axially ring；Phase
Spacing between adjacent two lantern rings is 0.01~1mm.The roller uses hot charging collar design, and assembly technology is simple and easy, production
It is reliable for operation.Because of its good flexibility, it can effectively improve the convexity in the operation of rolling and adjust and plate form control ability, spy
The two non-drive intermediate calender rolls of Sendzimir mill Yong Zuo be suitble to.But two intermediate calender rolls of this combined type mechanically are resistance to roll
What mill property then change without substantially.
In addition, application No. is 201520177152.9 entitled " a kind of abrasion-resistant rollers with original convexity " and
Application No. is the utility model patents of 201320121441.8 entitled " sheet metal evener pressure rollers " then in roll base
It is external that one layer of wearing layer is formed to improve the wearability of roll by laser melting coating or carburizing (nitrogen) heat treatment.These method institutes
It is generally shallower to obtain case depth, such as in 1mm or so even far smaller than 1mm, roll load big like that cannot be born, no
The sendzimir mill work roll cooling of period grinding is adapted to, and generally requiring must after each lower machine as cold rolling chrome-plated roller
Must carry out electrodeposited chromium cure process, increase the operation use cost of roll, this kind of wear-resistant coating be also difficult to avoid that there are tables
The problems such as layer falls off, such deficiency limits its direct application on sendzimir mill roll.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of Sendzimir with higher abrasion resistance and obdurability
Two intermediate calender rolls of milling train, to solve the deficiency that existing intermediate calender rolls wearability is low, short using the time.
Its technical problem to be solved can be implemented by the following technical programs.
A kind of two intermediate calender rolls of sendzimir mill, the roll body of two intermediate calender rolls are process by the steel grade of following component,
(wt.%) by weight percentage, the chemical component of the steel grade are as follows:
C:0.30-0.50%, Si≤1.00%, Mn≤1.00%, Cr:4.50-5.50%, Ni:0.20-1.00%, Mo:
0.60-1.00%, V:0.20-0.50%, W:0.50-1.25%, P≤0.025%, S≤0.025%, remaining is Fe and can not
The impurity avoided.
As the preferred embodiment of the present invention, reference table 2, by weight percentage (wt.%), the chemical component of the steel grade
Are as follows:
C:0.35-0.45%, Si:0.50~0.80%, Mn:0.50-1.00%, Cr:4.50-5.50%, Ni:0.35-
0.80%, Mo:0.60-0.80%, V:0.20-0.50%, W:0.50-1.00%, P≤0.025%, S≤0.025%, remaining
For Fe and inevitable impurity.
Compared with 5H12 steel, two intermediate calender rolls of sendzimir mill provided by the invention increase the content of part Ni element,
It plays and expands austenite region, prevents carburizing crackle and improve the harden ability of steel together with the elements such as Cr, Mn, make parts quenching
Center portion also obtains the lower martensitic structure of carbon content, thus the effects of improving the intensity and toughness of steel afterwards；W, Mo, V are strong
Carbide former then forms tiny, indissoluble carbide, ensure that the high intensity and high-wear resistance of roll material, is
Improve the toughness of two intermediate calender rolls, reduces the adverse effect to case-carbonizing, so suitably reduce the content of these elements,
And reduction W, Mo, V can also reduce roll manufacturing cost to a certain extent；Mn is weak carbide formation element, can promote steel
Carburizing, therefore properly increased the content of Mn.On the one hand the fine tuning of above-mentioned alloy content improves the carburizing on roll surface layer
On the other hand strengthening effect also ensures the good machinability and service performance of roll ontology.
Another technical problem to be solved by this invention is to provide a kind of two intermediate calender rolls of above-mentioned sendzimir mill
Manufacturing method includes at least after being forged into base by the roll body of said components and carries out Deep Carburization Process heat to roller surface working lining
The step of reason, and make the carbon content in work layer on surface from inside to outside by the carbon content C of center portion matrix0It is stepped up and arrives surface
Carbon content Cs.
As the further improvement of this method, carburizing temperature when carburizing is heat-treated is 950~1100 DEG C, and hardening heat is
950~1050 DEG C；Further include the steps that carrying out roll tempering, tempering temperature is 450~550 DEG C.
Also as the further improvement of this method, by weight percentage, matrix carbon content C0It is 0.35%~0.45%, table
Face carbon content Cs is 0.5%~1.2%.
Also as the further improvement of this method, after carburizing heat treatment, roller surface carburizing depth and roller surface work
The thickness of layer is roughly equal.
As the preferred embodiment of this method, when carburizing is heat-treated, two intermediate calender rolls that new roller diameter is Φ 239mm are come
It says, roll surface carburizing depth is best >=4.5mm.
As the further improvement of this method, after carburizing heat treatment, the control of roller surface working lining hardness 58~
62HRC, centre hardness are controlled in 50~58HRC.
Two intermediate calender rolls roll surface Deep Carburization Process heat treatment method of sendzimir mill provided by the invention, improves two intermediate calender rolls
Carbon content in work layer on surface increases the wearability of working lining, while the appropriate tempering for reducing by two intermediate calender rolls center portion matrixes is hard
Degree, improves the toughness of entire roll body, prevents two intermediate roller breakages.
On the whole, two intermediate calender rolls obtained by adopting the above technical scheme improve the wearability of two intermediate calender rolls and scratch tough
Property, the anti-accident ability of roll is improved while reducing roll wear, extends the work roll cooling time, and reducing roll makes
Use cost.Meanwhile it can also be promoted the use of in similar fields such as one intermediate calender rolls of Sendzimir.
Detailed description of the invention
Fig. 1 be 20 rollers sendzimir mill roll distribution schematic diagram (only depict 10 rolls of top half, under
10 symmetrical rolls of half part, which omit, to be not drawn into)；In figure: 1- strip；2- working roll；Mono- intermediate calender rolls of 3-；41- transmission two
Intermediate calender rolls；42- is servo-actuated two intermediate calender rolls；5 backing rolls；
Fig. 2 is two intermediate calender rolls working lining carbon content distribution schematic diagrams；
Fig. 3 is two intermediate calender rolls working lining hardness distribution schematic diagrams.
Specific embodiment
A specific embodiment of the invention is described in further detail below in conjunction with attached drawing.
As shown in Figure 1, strip 1 is when by the sendzimir mill of 20 rollers, working roll 2 is contacted with strip 1, accordingly
One intermediate calender rolls 3, two intermediate calender rolls 41 of transmission, servo-actuated two intermediate calender rolls 42 and backing roll 5 are in state position as shown in Figure 1, wherein
It is driven two intermediate calender rolls 41 to rotate under the driving effect of its driving device, then other each rollers is driven to follow rotation, realize to silicon ribbon
The rolling of steel is thinned.The related data of each roller is as shown in table 1 below.
Table 1:
This programme is mainly servo-actuated two intermediate calender rolls 42 or transmission two intermediate calender rolls, 41 roll surface in sendzimir mill and is seeped by deep layer
Carbon heat treatment, is gradually increased the carbon content in material from inside to outside in two intermediate calender rolls working lining depth bounds, increases working lining
Wearability；Meanwhile the roll center portion within working lining then keeps or reduces the tempering hardness of two intermediate calender rolls matrixes, increases center portion
Toughness is scratched, so as to improve the wearability and anti-accident performance of two intermediate calender rolls of sendzimir mill.
For this purpose, a kind of two intermediate calender rolls 41 or 42 of sendzimir mill are provided, chemical component weight percentage when smelting
Content (wt.%) is as follows:
C:0.30-0.50%, Si≤1.00%, Mn≤1.00%, Cr:4.50-5.50%, Ni:0.20-1.00%, Mo:
0.60-1.00%, V:0.20-0.50%, W:0.50-1.25%, P≤0.025%, S≤0.025%, remaining is Fe and can not
The impurity avoided.
In process, carburizing heat treatment is carried out after being forged into base.Roll 41 or the work of 42 surfaces after Carburization Treatment
Carbon content C in layer is from inside to outside by the carbon content C of center portion matrix0It is stepped up the carbon content Cs to surface, i.e., in working lining
Carbon content C in roll stell0≤C≤Cs.Preferably, matrix carbon content C0=0.35~0.45%, carbon contents Cs=0.5~
1.2%, it is realized with this and increases martensite carbon content and second particle carbide content in working lining, to increase by two intermediate calender rolls
The purpose of the wearability of working lining.
Two intermediate calender rolls 41 or 42 manufacturing process are as follows: electric furnace smelting → vacuum refining → ingot casting → forging stock → conditioning treatment →
Roughing → carburizing and quenching → subzero treatment → tempering → finishing → finished product.Wherein, according to the difference of chemical component, it is proposed that
950~1100 DEG C of carburizing temperature, 950~1050 DEG C of hardening heat, 450~550 DEG C of tempering temperature.
Final roll surface carburizing depth and roll working lining thickness are substantially suitable, and two intermediate calender rolls 41 of recommendation or 42 working linings are hard
Degree is in 58~62HRC, and centre hardness is in 50~58HRC.
It is below specific embodiment and related data.
Embodiment 1:
Reference table 2, the chemical component (wt.%) of steel grade listed by chemical component 4 are as follows: 0.40%C, 0.80%Si, 0.60%
Mn, 5.00%Cr, 0.45%Ni, 0.80%Mo, 0.35%V, 1.00%W, P < 0.025%, S < 0.010%, remaining for Fe and
Inevitable impurity has mainly carried out carbon content and other alloying element contents excellent compared with existing 5H12 steel
Change.The roll of base is forged by the steel grade of this chemical component and obtains two required intermediate calender rolls after the processing of aforementioned treatment process.
Wherein, about 1080 DEG C of the carburizing temperature in treatment process, about 1050 DEG C of hardening heat, about 540 DEG C of tempering temperature.
The carbon contents about 1.0% of final roll, working lining hardness about 62HRC, roll centre hardness about 56HRC.
Embodiment 2:
Reference table 2, the chemical component (wt.%) of steel grade listed by chemical component 5 are as follows: 0.35%C, 0.80%Si, 0.60%
Mn, 5.00%Cr, 0.50%Ni, 0.80%Mo, 0.35%V, 0.80%W, P < 0.025%, S < 0.010%, remaining for Fe and
Inevitable impurity mainly reduces carbon content, increases nickel content, reduces W content, to promote compared with Example 1
Have the advantages that centainly to reduce roll manufacturing cost due to reducing the use content of noble metal tungsten while carburizing effect.It presses
The steel grade of this chemical component is forged into the roll of base and obtains two required intermediate calender rolls after the processing of aforementioned treatment process.
In the process, about 1060 DEG C of carburizing temperature, about 1020 DEG C of hardening heat, about 520 DEG C of tempering temperature.
The carbon contents about 0.80% of final roll, working lining hardness about 60HRC, roll centre hardness about 53HRC.
Embodiment 3:
Reference table 2, the chemical component (wt.%) of steel grade listed by chemical component 6 are as follows: 0.35%C, 0.80%Si, 0.80%
Mn, 5.00%Cr, 0.50%Ni, 0.60%Mo, 0.35%V, 0.80%W, P < 0.025%, S < 0.010%, remaining for Fe and
Inevitable impurity mainly increases manganese content, reduces molybdenum content, further carburizing to be promoted to imitate compared with Example 2
Fruit.The roll of base is forged by the steel grade of this chemical component and obtains two required intermediate calender rolls after the processing of aforementioned treatment process.
In the process, about 1060 DEG C of carburizing temperature, about 980 DEG C of hardening heat, about 500 DEG C of tempering temperature.
The carbon contents about 0.65% of final roll, working lining hardness about 60HRC, roll centre hardness about 50HRC.
Table 2:
In addition, also being enumerated in table 2 some other for manufacturing the steel grade component of two intermediate calender rolls roll bodies of the invention.
In conjunction with Fig. 2, Fig. 3, existing two intermediate calender rolls are made of 5H12 steel, and carbon content is equal in roller surface and center portion
In 0.5% or so, the carbon content as shown in the chain-dotted line in Fig. 2 is distributed；Its hardness is in roller surface and center portion
62~58HRC or so, due to quenching with tempering heat treatment process, surface hardness is slightly higher, and centre hardness is slightly lower, in Fig. 3
Chain-dotted line shown in hardness distribution.For the present invention program, roll through over carburizing due to being heat-treated, and carbon contains in work layer on surface
Amount is from inside to outside by the carbon content C of center portion matrix0It is stepped up the carbon content Cs to surface, and Cs >=C0, to increase roll work
Carbon content realizes the purpose for increasing roll wearability and toughness in layer, carbon content distribution as black shown in solid in Fig. 2,
It is black shown in solid in hardness distribution such as Fig. 3.The selection of chemical composition of this programme can first select carbon content C0Afterwards reference table 2 again into
Row selects other alloying element contents, not only improves according to this and realizes Deep Carburization Process, improve work roll cooling performance again, combine and roll
Roller has the purpose of excellent machinability.
The present invention is heat-treated by material design, Deep Carburization Process, improves two intermediate calender rolls work layer on surface wearabilities, simultaneously
Improve center toughness and anti-cracking performance, preferably solve the problems, such as roll wearability and resist it is accident be difficult to take into account, can be gloomy
It is promoted the use of in terms of the small dimensions rolls such as various two intermediate calender rolls, an intermediate calender rolls, backing cloth bearing roller in your roller system of rolling mill of Jimmy, tool
There is the economic benefit of highly significant.
It should be noted that technical principle and feature that this patent above-described embodiment is intended to be merely illustrative of the present and be related to
Some master datas and parameter, it is any by other chemical components and combinations thereof of the technology of the present invention principle design, manufacturing process and
A combination thereof belongs to protection scope of the presently claimed invention.
Claims (8)
1. a kind of two intermediate calender rolls of sendzimir mill, which is characterized in that the roll body of two intermediate calender rolls by following component steel grade
It is process, by weight percentage, the chemical component of the steel grade are as follows:
C:0.30-0.50%, Si≤1.00%, Mn≤1.00%, Cr:4.50-5.50%, Ni:0.20-1.00%, Mo:
0.60-1.00%, V:0.20-0.50%, W:0.50-1.25%, P≤0.025%, S≤0.025%, remaining is Fe and can not
The impurity avoided.
2. two intermediate calender rolls of sendzimir mill according to claim 1, which is characterized in that by weight percentage, the steel grade
Chemical component are as follows: C:0.35-0.45%, Si:0.50~0.80%, Mn:0.50-1.00%, Cr:4.50-5.50%, Ni:
0.35-0.80%, Mo:0.60-0.80%, V:0.20-0.50%, W:0.50-1.00%, P≤0.025%, S≤0.025%,
Remaining is Fe and inevitable impurity.
3. a kind of manufacturing method of two intermediate calender rolls of sendzimir mill as claimed in claim 1 or 2, which is characterized in that by above
The roll body of component includes at least the step of carrying out Deep Carburization Process heat treatment to roller surface working lining after being forged into base, and makes surface
Carbon content in working lining is from inside to outside by the carbon content C of roll center portion matrix0It is stepped up roller surface carbon content Cs.
4. the manufacturing method of two intermediate calender rolls of sendzimir mill according to claim 3, which is characterized in that carburizing heat treatment
Afterwards, by weight percentage, roller surface carbon content Cs is 0.5%~1.2%.
5. the manufacturing method of two intermediate calender rolls of sendzimir mill according to claim 3, which is characterized in that carburizing heat treatment
Afterwards, the thickness of roller surface carburizing depth and working lining is roughly equal.
6. the manufacturing method of two intermediate calender rolls of sendzimir mill according to claim 3, which is characterized in that carburizing heat treatment
When carburizing temperature be 950~1100 DEG C, hardening heat be 950~1050 DEG C；It further include the step that tempering is carried out to roll
Suddenly, tempering temperature is 450~550 DEG C.
7. according to claim 4,5 or the manufacturing method of two intermediate calender rolls of 6 sendzimir mills, which is characterized in that carburizing
After heat treatment, for the case-carbonizing depth >=4.5mm for two intermediate calender rolls that new roller diameter is Φ 239mm.
8. the manufacturing method of two intermediate calender rolls of sendzimir mill according to claim 7, which is characterized in that carburizing heat treatment
Afterwards, the control of roller surface working lining hardness is controlled in 58~62HRC, centre hardness in 50~58HRC.
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Application publication date: 20190305 |