CN109641250A - Hot rolling roller cladding material and hot rolling composite roll - Google Patents
Hot rolling roller cladding material and hot rolling composite roll Download PDFInfo
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- CN109641250A CN109641250A CN201780050783.6A CN201780050783A CN109641250A CN 109641250 A CN109641250 A CN 109641250A CN 201780050783 A CN201780050783 A CN 201780050783A CN 109641250 A CN109641250 A CN 109641250A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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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
- 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
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
- B21B27/032—Rolls for sheets or strips
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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
- C21D5/00—Heat treatments of cast-iron
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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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
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- Chemical & Material Sciences (AREA)
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Abstract
The purpose of the present invention is to provide ensure wear resistance and make the pit shape defect of roller surface is reduced, resistance to superficial roughness is excellent hot rolling roller cladding material and hot rolling composite roll.Hot rolling roller cladding material is characterized in that, with following compositions: containing C:2.0~3.0% in terms of quality %, Si:0.2~1.0%, Mn:0.2~1.0%, Cr:4.0~7.0%, Mo:3.0~6.5%, V:5.0~7.5%, Nb:0.5~3.0%, Ni:0.05~3.0%, Co:0.2~5.0%, W:0.5~5.0%, and C, Cr, Mo, V, Nb, Ni, the content of W meets following formula (1), surplus is formed by Fe and inevitable impurity, the above are tempered martensite and/or bainite structures for the 85% of matrix, the minor axis of tempered martensite or bainite is 0.5~3.0 μm.0.05≤(%C-%V × 0.177-%Nb × 0.129-%Cr × 0.099-%Mo × 0.063-%W × 0.033)+(%Ni)≤4.0 (1).Wherein, %C, %V, %Nb, %Cr, %Mo, %W, %Ni are the content (quality %) of each element.
Description
Technical field
The present invention relates to hot rolling composite rolls, more particularly to are suitable as the hot rolling roller of the hot finisher purposes of steel plate
Cladding material and hot rolling composite roll.
Background technique
In recent years, with the progress of the hot rolling technique of steel plate, the use environment of roller is more harsh, in addition, high-strength steel sheet,
The output of the big steel plate of the rolling loads such as thin wall product is also increasing.Therefore, it is generated in operation roller by rolling surface in rolling
Fatigue caused by rough surface, clast scaling defects (chipping defects) the case where become it is more, be strongly required compare with
Resistance to superficial roughness and resistance to clast spalling toward more high level.Currently, using high-speed steel system roller, the high speed in hot rolling more
Steel system roller largely forms hard carbide by adding the V of a few % amounts, so that wear resistance be made to improve.
As the cladding material of such high-speed steel system roller, for example, proposing following rolling roller outer layers in patent document 1
Material, it includes C:1.5~3.5%, Ni:5.5% or less, Cr:5.5~12.0%, Mo:2.0~8.0%, V:3.0~
10.0%, Nb:0.5~7.0%, also, particular kind of relationship is met with the content of Nb, V and C and the ratio between Nb and V are in particular range
Interior mode contains Nb and V.It can inhibit the inclined of the hard carbide in cladding material using centre spinning as a result,
Analysis, becomes wear resistance and resistance to anti-thread breakage excellent rolling roller cladding material.In addition, proposing following roll in patent document 2
System use roller cladding material, it includes C:1.5~3.5%, Cr:5.5~12.0%, Mo:2.0~8.0%, V:3.0~10.0%,
Nb:0.5~7.0%, also, the side that particular kind of relationship and the ratio between Nb and V are within a certain range is met with the content of Nb, V and C
Formula contains Nb and V.It is wear-resisting even if can also inhibit the segregation of the hard carbide in cladding material as a result, using centre spinning
Damage property and resistance to anti-thread breakage raising have larger contribution to the productivity raising of hot rolling.
On the other hand, it is improved from the quality of hot rolled product from the viewpoint of being improved with productivity, hot rolling roller uses ring
Border becomes more severe cruel, and the continuous rolling amount of steel plate is also increasing.In addition, requirement to the surface quality of hot rolled product is also more
Strictly.Therefore, compared with inhibiting abrasion, the fatigue damage of roller surface as rough surface is inhibited to become bigger project.Needle
To such project, following centrifugal casting composite rolls are proposed in patent document 3, it includes C:2.2~2.6%, Cr:5.0
~8.0%, Mo:4.4~6.0%, V:5.3~7.0%, Nb:0.6~1.3%, and be in Mo+V, C-0.24V-0.13Nb
Mode in particular range adjusts C, Mo, V, Nb content, so that the excellent in fatigue on the roller surface layer under hot rolling environment.Separately
Outside, following rolling roller cladding materials are proposed in patent document 4, contain C:1.3~2.2%, Si:0.3~1.2%, Mn:
0.1~1.5%, Cr:2.0~9.0%, Mo:9.0% or less, V:4.0~15.0% and W:20.0% or less, Ni:5.0% with
Under, in Co:10.0% or less any one or it is two or more, and surplus is essentially Fe and inevitable impurity, point
The size of the carbide in its tissue is dissipated in particular range.In patent document 4, by reducing coarse carbide easy to form
Eutectic carbide amount, so as to reduce pit shape defect.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 04-365836 bulletin
Patent document 2: Japanese Unexamined Patent Publication 05-1350 bulletin
Patent document 3: Japanese Unexamined Patent Publication 2009-221573 bulletin
Patent document 4: No. 3962838 bulletins of Japanese Patent No.
Summary of the invention
Subject to be solved by the invention
However, rolling technique in recent years is at an amazing speed towards the high-quality of rolled plate and advanced progress.Together
When, also strictly pursues rolling cost effective, therefore the use environment of roller is further harsh.Therefore, just previous to be only conceived to
For the design of the roller material of carbide, there is the case where can not reducing the generation of pit shape defect.
The present invention be in view of the foregoing and make, and it is an object of the present invention to provide ensuring wear resistance and making the recessed of roller surface
Cheat hot rolling roller cladding material and hot rolling composite roll that shape defect is reduced, that resistance to superficial roughness is excellent.
Means for solving the problems
Present inventor has carried out detailed tune to the generating unit for the pit shape defect for being formed in hot rolling roller surface
It looks into.As a result it specifies, pit shape defect is because of eutectic carbide (mainly M2C system, M6C system, M7C3System and M23C6It is carbide)
The crackle of generation is propagated in matrix and clast peels off (chip away) at caused by pit shape.Therefore, in order to reduce
Pit shape defect, other than being conceived to category of carbides, size in the past, it is believed that reduce propagation of the crackle in matrix
Speed is effectively, to have thus completed the present invention.That is, for the heat-resisting rolling contact fatigue and matrix that influence roller cladding material
The various factors of size is studied, and previous unknown opinion is as a result obtained, that is, by the ingredient model for adjusting each element
The content of each element is enclosed and adjusts in such a way that each element meets particular kind of relationship, so that fatigue durability when hot rolling significantly mentions
It is high.In addition, having also obtained following opinion, that is, by controlling matrix size, fatigue durability when hot rolling is further significantly mentioned
It is high.
Firstly, being illustrated to the experimental result as basis of the invention.Using Efco-Northrup furnace by following compositions
Molten metal melting, and using centre spinning casting be equivalent to roller cladding material cyclic annular roll material (outer diameter: 250mm φ, it is wide
Degree: 65mm, wall thickness: 55mm), the composition are as follows: it is set as Si:0.1~1.5%, Mn:0.1~1.5% in terms of quality %, and
And make C 1.6~3.5% range, Cr 3.5~9.0% range, Mo 2.1~7.0% range, V 4.1~
Range 0.3~8.0% of range, Co 0.02~3.6% of range, Ni 0.3~4.6% of 8.5% range, Nb, W
Change in the range of 0.2~8.0%, surplus is Fe and inevitable impurity.It should be noted that cast temperature is 1450
DEG C~1530 DEG C, for centrifugal force, so that the peripheral part of cyclic annular roll material is set in the way of becoming 180G in terms of gravitation multiple
It is fixed.After casting, implements quenching treatment, tempering, make hardness HS 78~86.It should be noted that quenching treatment is heating
To 1070 DEG C of heating temperatures, then carry out air-cooled processing.In addition, for tempering, in order to make retained austenite
Amount is implemented 2 times or 3 times in 530~570 DEG C of temperature according to ingredient less than 10% (in terms of volume %).
Hot rolling fatigue test piece (outer diameter 60mm φ, wall thickness 10mm) is acquired from obtained cyclic annular roll material, according to Japanese special
It opens 2010-101752 and implements hot rolling fatigue test, the hot rolling fatigue test is shown to reproducibility and evaluates reality well
The fatigue durability of hot rolling operation roller in production.It should be noted that in fatigue test piece, by using 0.2mm φ's
Electro-discharge machining (wire cutting) method of wire rod (wire) has imported notch (depth as shown in Figure 1 at 2 positions of outer peripheral surface
T:1.2mm, circumferential lengths L:0.8mm).In addition, implementing the chamfering of 1.2C to the end of the plane of rotation of fatigue test piece.
As shown in Figure 1, hot rolling fatigue test is by having test film (hot rolling fatigue test piece) jaggy and heated
The double-arc spline of mating member rolls sliding rotating manner (rolling-sliding mode) and carries out.That is, as shown in Figure 1, using on one side
Test film (hot rolling fatigue test piece) 1 is carried out water cooling by cooling water 2, is rotated it with 700rpm on one side, will be utilized high-frequency induction
The pairing piece (material: S45C, outer diameter: 190mm φ, width: 15mm) 4 that heating coil 3 is heated to 800 DEG C is pressed with the load of 980N
It is pressed on the test film 1 of rotation, while rotates it with 9% sliding ratio.Rotate hot rolling fatigue test piece 1, until importing
Two notches 5 in the hot rolling fatigue test piece 1 are damaged, find out the rotation number of revolutions until each notch is damaged respectively,
Using its average value as hot rolling fatigue life.In addition, the situation that hot rolling fatigue life is more than 350,000 times is evaluated as hot rolling fatigue
Service life is significantly excellent.
In addition, carrying out structure observation to obtained cyclic annular roll material.For structure observation, in cyclic annular roll material away from outer
Any position of the inside of surface 10mm, the structure observation test film of 10 × 10 × 5mm of acquisition (the wall thickness direction that 5mm is ring),
And the face of 10 × 10mm is mirror-finished, with nital (5 volume % nitric acid+ethyl alcohol) corrode 10 seconds or so, so
Structure observation is carried out using optical microscopy afterwards.
In addition, in order to measure the minor axis (minor axis length) of tempered martensite or bainite, in obtained cyclic annular roll material
Any position of inside away from outer surface 10mm acquires measurement test piece (5mm × 10mm × 5mm), to the face of 5mm × 10mm into
Row mirror finish, implements EBSD measurement.Under conditions of acceleration voltage is 15kV, step size is 0.1 μm, to 10000 μm2With
On region be measured using electron backscatter diffraction (EBSD).In the portion for being 15 ° or more with the gun parallax of adjacent measuring point
Position draws boundary line, as shown in Fig. 2, being 5 μ to major diameter in aspect of measure using the region surrounded by boundary line as a crystal
The minor axis of 20 crystal of m or more is measured, and calculates its average value.
About it is obtaining as a result, by hot rolling fatigue life with (%C-%V × 0.177-%Nb × 0.129-%Cr ×
0.099-%Mo × 0.063-%W × 0.033)+the relationship of (%Ni) is shown in Fig. 3, by hot rolling fatigue life and tempered martensite
Or the relationship of the minor axis of bainite is shown in Fig. 4.
From the figure 3, it may be seen that (%C-%V × 0.177-%Nb × 0.129-%Cr × 0.099-%Mo × 0.063-%W ×
0.033) when+(%Ni) is 0.05 or more and 4.0 or less, hot rolling fatigue life is significantly improved.Wherein, V, Cr, Mo, Nb, W are to hold
The element of carbide is easily formed, (%C-%V × 0.177-%Nb × 0.129-%Cr × 0.099-%Mo × 0.063-%W ×
0.033) carbon amounts being solid-solution in matrix is indicated.Therefore, (%C-%V × 0.177-%Nb × 0.129-%Cr × 0.099-%
Mo × 0.063-%W × 0.033)+(%Ni) be the sum of the carbon amounts being solid-solution in matrix and Ni amount, it is suitable by the way that the value to be adjusted to
In the range of, the spread speed of the crackle in matrix is slack-off, and hot rolling fatigue life excellent roller cladding material can be obtained.Separately
Outside, by meeting mentioned component range and controlling the crystalline size of the tempered martensite of matrix or bainite in Fig. 4 institute
In the range of showing, hot rolling fatigue life can be significantly improved.
The present invention is completed based on above-mentioned opinion, and purport is as described below.
[1] hot rolling roller cladding material, which is characterized in that have following compositions: in terms of quality % containing C:2.0~
3.0%, Si:0.2~1.0%, Mn:0.2~1.0%, Cr:4.0~7.0%, Mo:3.0~6.5%, V:5.0~7.5%,
Nb:0.5~3.0%, Ni:0.05~3.0%, Co:0.2~5.0%, W:0.5~5.0%, and C, Cr, Mo, V, Nb, Ni, W
Content meet following formula (1), surplus is formed by Fe and inevitable impurity,
The hot rolling in roller cladding material, the 85% of matrix the above are tempered martensite and/or bainite structure,
The minor axis of tempered martensite or bainite is 0.5~3.0 μm.
0.05≤(%C-%V × 0.177-%Nb × 0.129-%Cr × 0.099-%Mo × 0.063-%W × 0.033)
+ (%Ni)≤4.0 (1)
Wherein, %C, %V, %Nb, %Cr, %Mo, %W, %Ni are the content (quality %) of each element.
[2] hot rolling composite roll is formed by outer layer and internal layer welding integrated, which is characterized in that the outer layer is by [1]
The hot rolling is formed with roller cladding material.
The effect of invention
In accordance with the invention it is possible to which the significantly reduced hot rolling roller cladding material of the spread speed for manufacturing crackle and hot rolling are with again
Close roller.As a result, it is possible to inhibit rough surface, clast peeling etc. by hot rolling bring surface damage, so that also having can be real
Now effect as the extension, the raising in roller service life of continuous rolling distance.
Detailed description of the invention
Pharynx 1] Fig. 1 be the composition for schematically showing testing machine used in hot rolling fatigue testing, hot rolling contact fatigue examination
It tests and is lacked with what the outer peripheral surface of test film (fatigue test piece), Ji Xiangre rolling fatigue testing test film (fatigue test piece) imported
Shape, the explanatory diagram of size of mouth.
Pharynx 2] Fig. 2 is to show to be measured the hot rolling that embodiments of the present invention are related to roller cladding material using EBSD
Result figure.
[Fig. 3] Fig. 3 be show hot rolling fatigue life in hot rolling fatigue test with (%C-%V × 0.177-%Nb ×
0.129-%Cr × 0.099-%Mo × 0.063-%W × 0.033)+the relationship of (%Ni) figure.
[Fig. 4] Fig. 4 is the minor axis for showing hot rolling fatigue life and tempered martensite or bainite in hot rolling fatigue test
Relationship figure.
Specific embodiment
Hot rolling roller cladding material of the invention can be cast using known centre spinning or continuous casting cladding process etc.
Method manufacture, although also can compare directly as cyclic annular roller, sleeve roll (sleeve roll) and be suitable as being suitable for heat essence
Roll the cladding material of the hot rolling composite roll of purposes.In addition, hot rolling composite roll of the invention by outer layer and with the outer layer welding
Integrated internal layer is constituted.It should be noted that middle layer can also be configured between outer layer and internal layer.That is, also can replace
With the internal layer of outer layer welding integrated, and formed with the middle layer of outer layer welding integrated and with the middle layer welding integrated
Internal layer.In the present invention, internal layer, middle layer composition be not particularly limited, it is preferred that internal layer be nodular cast iron (ball
Black cast iron), forged steel, middle layer be the mass of C:1.5~3.0 % high-carbon material.
Firstly, being illustrated for the reasons why outer layer (cladding material) composition for limiting hot rolling composite roll of the invention.
It should be noted that hereinafter, unless otherwise specified, then quality % is referred to as %.
C:2.0~3.0%
C, which has the effect that, to be dissolved and increases matrix hardness, and is formed in conjunction with carbide former
Hard carbide improves the wear resistance of roller cladding material.Eutectic carbide amount changes according to C content.Eutectic carbon
Compound influence of rolled uses characteristic.Therefore, when C content is less than 2.0%, eutectic carbide amount is insufficient, and frictional force when rolling increases
Add, rolling becomes unstable, and since the C amount being dissolved in matrix is low, so that heat-resisting rolling contact fatigue reduces.Separately
When on the one hand, containing 3.0% C is had more than, carbide coarsening, eutectic carbide amount are excessively increased, and become roller cladding material
Firmly, brittle, the generation of fatigue cracking grows aggravation, so that fatigue durability be made to reduce.Therefore, C is limited to 2.0~3.0%
In range.It should be noted that preferably 2.1~2.8%.
Si:0.2~1.0%
Si be play a role and improve as deoxidier molten metal castability element.It is such in order to obtain
Effect, it is necessary to contain 0.2% or more Si.On the other hand, though containing have more than 1.0% Si, effect can also be saturated and can not
Expect the effect to match with content, becomes unfavorable in economic aspect, in addition, there is also the situations for making matrix embrittlement.Therefore,
Si is limited in 0.2~1.0%.It should be noted that preferably 0.3~0.7%.
Mn:0.2~1.0%
Mn is that have the function of that S is fixed as MnS and keeps S innoxious and have to be solid-solution in matrix group by a part
Knit and make the element of the effect of hardenability raising.In order to obtain such effect, it is necessary to contain 0.2% or more Mn.Another party
Face, even if effect can also be saturated and can not expect the effect to match with content, in addition, there is also make containing the Mn for having more than 1.0%
The situation of material embrittlement.Therefore, Mn is limited in 0.2~1.0%.It should be noted that preferably 0.3~0.8%.
Cr:4.0~7.0%
Cr is the element having the effect that: it primarily forms eutectic carbide in conjunction with C, improves wear resistance,
Also, reduce rolling when and steel plate frictional force, mitigate the surface damage of roller, make rolling stabilize.In order to obtain such effect
Fruit, it is necessary to contain 4.0% or more Cr.When on the other hand, containing 7.0% Cr is had more than, coarse eutectic carbide increases, because
This reduces fatigue durability.Therefore, Cr is limited in the range of 4.0~7.0%.It should be noted that preferably 4.3~
6.5%.
Mo:3.0~6.5%
Mo is the carbide that hard is formed in conjunction with C, the element for making wear resistance raising.It is combined in addition, Mo is solid-solution in
V, it to strengthen carbide in the MC type carbide of the hard of Nb, C, and is also solid-solution in eutectic carbide, makes these carbonizations
The fracture resistance (fracture resistance) of object increases.Via such effect, Mo makes the wear-resistant of roller cladding material
Property, fatigue durability improve.In order to obtain such effect, it is necessary to contain 3.0% or more Mo.On the other hand, containing having more than
When 6.5% Mo, the brittle carbide based on Mo is generated, heat-resisting rolling contact fatigue is reduced, reduces fatigue durability.
Therefore, Mo is limited in the range of 3.0~6.5%.It should be noted that preferably 3.5~6.0%.
V:5.0~7.5%
V is in the present invention in order to make roller have both the important element of wear resistance and fatigue durability.V is following elements: its
The carbide (MC type carbide) of extremely hard is formed, so that wear resistance is improved, and for dividing eutectic carbide,
Make effectively to play a role for its dispersed crystalline, improve heat-resisting rolling contact fatigue, keeps the fatigue durability of roller cladding material aobvious
Land raising.By the V containing 5.0% or more, such effect becomes significant.When on the other hand, containing 7.5% V is had more than,
Make MC type carbide coarsening, therefore the various characteristics of rolling roller become unstable.Therefore, V is limited to 5.0~7.5%
In range.It should be noted that preferably 5.2~7.0%.
Nb:0.5~3.0%
Nb is solid-solution in MC type carbide to strengthen MC type carbide, and via increasing the fracture resistance of MC type carbide
Effect, make wear resistance, especially fatigue durability improve.By being solid-solution in Nb in carbide together with Mo, thus wear-resisting
The raising of damage property and fatigue durability becomes significant.In addition, Nb is with segmentation, the inhibition eutectic carbonization for promoting eutectic carbide
The effect of the fracture of object is to improve the element of the fatigue durability of roller cladding material.In addition, Nb have both to MC type carbide from
The effect that segregation when the heart is cast is inhibited.By the Nb containing 0.5% or more, such effect becomes significant.Another party
Face when content is more than 3.0%, can promote the growth of the MC type carbide in molten metal, and heat-resisting rolling contact fatigue is made to be deteriorated.Cause
This, Nb is limited in the range of 0.5~3.0%.It should be noted that preferably 0.8~1.5%.
Ni:0.05~3.0%
Ni is the hardenability for being solid-solution in matrix, the phase transition temperature of the austenite in heat treatment being made to reduce, improve matrix
Element.In order to obtain such effect, it is necessary to contain 0.05% or more Ni.When on the other hand, containing 3.0% Ni is had more than,
The phase transition temperature of austenite becomes too low, and hardenability improves, therefore after heat treatment, and austenite is easy residual.If Ovshinsky
Body residual then cracks etc. in hot rolling, reduces heat-resisting rolling contact fatigue.Therefore, Ni is limited to 0.05~3.0% model
In enclosing.It should be noted that from even if heat treatment in cooling velocity slowly the crystalline size of matrix can be made to become micro-
From the aspect of thin such handling easiness, preferably 0.2~3.0%.
Co:0.2~5.0%
Co is the element having the effect that: being solid-solution in matrix, to especially strengthen matrix at high temperature, makes endurance
Property improve.In order to obtain such effect, it is necessary to contain 0.2% or more Co.On the other hand, even if containing having more than 5.0%
Co, effect can be also saturated, and can not expect the effect to match with content, unfavorable in economic aspect.Therefore, Co be limited to 0.2~
In the range of 5.0%.It should be noted that preferably 0.5~3.0%.
W:0.5~5.0%
W is the member for having the function of being solid-solution in matrix to especially strengthen matrix at high temperature, improve fatigue durability
Element, and form M2C or M6The carbide of C system, improves wear resistance.In order to obtain such effect, it is necessary to contain 0.5%
Above W.When on the other hand, containing 5.0% W is had more than, not only effect is saturated, but also forms coarse M2C or M6The carbon of C system
Compound reduces heat-resisting rolling contact fatigue.Therefore, W is limited in the range of 0.5~5.0%.It should be noted that preferably
1.0~3.5%.
In the present invention, C, Cr, Mo, V, Nb, Ni, W are contained with above range, also, in a manner of meeting following formula (1) into
Row adjusts and contains each element.
0.05≤(%C-%V × 0.177-%Nb × 0.129-%Cr × 0.099-%Mo × 0.063-%W × 0.033)
+ (%Ni)≤4.0 (1)
Wherein, %C, %V, %Nb, %Cr, %Mo, %W, %Ni are the content (quality %) of each element.
In a manner of meeting above-mentioned formula (1) to (%C-%V × 0.177-%Nb × 0.129-%Cr × 0.099-%Mo ×
0.063-%W × 0.033)+(%Ni) be adjusted, thus damaged rotation number dramatically increases, and it is significant that fatigability is touched in heat-resisting rollings
It improves.(%C-%V × 0.177-%Nb × 0.129-%Cr × 0.099-%Mo × 0.063-%W × 0.033)+(%Ni) be
An important factor for as the driving force for improving heat-resisting rolling contact fatigue, when being in other than the range of above-mentioned formula (1), heat-resisting rolling is tired
Labor is deteriorated.V, Cr, Mo, Nb, W are the element of carbide easy to form, (%C-%V × 0.177-%Nb × 0.129-%Cr
× 0.099-%Mo × 0.063-%W × 0.033) indicate the carbon amounts for being solid-solution in matrix.Therefore, (%C-%V × 0.177-%Nb
× 0.129-%Cr × 0.099-%Mo × 0.063-%W × 0.033)+(%Ni) be solid-solution in matrix carbon amounts and Ni amount it
With by the way that the value to be adjusted in appropriate range, the spread speed of the crackle in matrix is slack-off, and hot rolling fatigue life can be obtained
Excellent roller cladding material.Therefore, the present invention in, in a manner of meeting above-mentioned formula (1) to (%C-%V × 0.177-%Nb ×
0.129-%Cr × 0.099-%Mo × 0.063-%W × 0.033)+(%Ni) be adjusted.
Surplus other than mentioned component is Fe and inevitable impurity.
In addition, present invention it is preferred that, the 85% of matrix the above are tempered martensite and/or bainite structure,
And the minor axis of tempered martensite or bainite is 0.5~3.0 μm.Retained austenite, when dividing rate more of pearlitic structrure, heat-resisting rolling
Dynamic fatigability reduces, therefore includes 85% or more tempered martensite and/or bainite structure preferably in matrix, from resistance to
It more preferably include 90% or more from the viewpoint of hot rolling contact fatigue.It should be noted that remaining Austria can be enumerated as surplus
Family name's body and/or pearlite.It should be noted that in order to make the 85% of matrix the above are tempered martensite and/or bainite,
It is controlled using the number of repetition for being heated to carrying out cooling process after 500~570 DEG C and holding.
In addition, the minor axis of tempered martensite or bainite less than 0.5 μm as in component system, phase transition temperature becomes
It is too low, even if tempering is repeated, it is also difficult to reduce remained austenite content, there may be caused by retained austenite in hot rolling
Crackle, heat-resisting rolling contact fatigue reduces.In addition, when the minor axis of tempered martensite or bainite is more than 3.0 μm, matrix
The propagation rate of crack becomes faster, and heat-resisting rolling contact fatigue reduces.It is therefore preferable that by the tempered martensite of matrix or bainite
Minor axis is limited in the range of 0.5~3.0 μm.From the viewpoint of heat-resisting rolling contact fatigue, preferably in 0.5~2.0 μm of model
In enclosing.In addition, the minor axis in order to obtain, the mode control composition in the range of being in 200~400 DEG C with the phase transition temperature of matrix
And cooling velocity.
Then, the preferable production process of hot rolling of the invention composite roll is illustrated.
In the present invention, for the manufacturing method of roller cladding material, preferably by known centre spinning or continuously pour
The castings such as casting cladding process are manufactured.It should be noted that the present invention is not limited to these methods certainly.
Using centre spinning casting roll cladding material, firstly, by the molten of above-mentioned roller cladding material composition
Melt metal to pour to cast from and be coated on interior surface with 1~5mm thickness with zircon etc. as main material in a manner of becoming regulation wall thickness
Refractory material, rotation mold in, carry out centrifugal casting.Wherein, for the revolving speed of mold, preferably make to be applied to the outer of roller
The gravitation multiple on surface is in the range of 120~220G.Moreover, in the case where forming middle layer, preferably in roller cladding material
Process of setting in or completely solidification after, rotate mold on one side, on one side cast middle layer composition molten metal, be centrifuged
Casting.Preferably, after outer layer or middle layer solidify completely, stop the rotation of mold and erect mold, later to internal layer
Material stand casting to which composite roll be made.The inner surface side of roller cladding material melts again as a result, become outer layer with it is interior
The composite roll of layer welding integrated or outer layer and middle layer, middle layer and internal layer welding integrated.
It should be noted that stand casting internal layer it is preferable to use the excellent spheroidal graphite cast-iron of castability and engineering properties,
Vermicular cast iron (CV cast iron) etc..Due to the outer layer and internal layer integral welding of centrifugal casting roller, it is mixed into 1 in internal layer~
The ingredient of 8% or so cladding material.If the carbide formers such as Cr, V for including in cladding material are mixed into internal layer, can make
Internal layer fragility.Therefore, the incorporation rate of outer composition inner layer is preferably suppressed to less than 6%.
In addition, in the case where forming middle layer, as intermediate layer material, it is preferable to use graphitic steel, high-carbon steel, hypoeutectic
Cast iron etc..Integral welding, outer composition are mixed into middle layer with 10~95% range to middle layer in the same way with outer layer.From
From the viewpoint of the mixed volume for inhibiting outer composition inner layer, reducing outer composition in advance as far as possible to the mixed volume of middle layer is
Important.
Hot rolling of the invention is preferably implemented to be heat-treated after casting with composite roll.Heat treatment preferably carries out following processes
2 times or more, that is, be heated to 950~1100 DEG C and carry out the process of air-cooled or air-cooled (air blast cooling), He Jinyi
Step is heated to 500~570 DEG C and carries out cooling process after being kept.At this point, by according to constituent adjustment cooling velocity
So that phase transition temperature is in the range of 200~400 DEG C, so as to obtain preferred minor axis size above-mentioned.In addition, due to base
The amount meeting basis of tempered martensite and/or bainite in body tissue is heated to 500~570 DEG C and is cooled down after being kept
Process number of repetition and change, therefore so that matrix 85% the above are the sides of tempered martensite and/or bainite
Formula sets number of repetition.
It should be noted that the preferred hardness of hot rolling composite roll of the invention is 79~88HS (Shore hardness), it is more excellent
The hardness of choosing is 80~86HS.When hardness is lower than 80HS, wear resistance is deteriorated, on the contrary, when hardness is more than 86HS, it is difficult to by grinding
Mill will remove in hot rolling in the crackle that hot rolling roller surface is formed.It is preferred that after casting heat treatment temperature, heat treatment time into
Row is adjusted, and enables to steadily ensure such hardness.
Embodiment
It is melted using Efco-Northrup furnace and obtains the molten metal of the composition of roller cladding material shown in table 1, and utilized
Loop test material (cyclic annular roller is made in centre spinning；Outer diameter: 250mm φ, width: 65mm, wall thickness: 55mm).It needs to illustrate
, cast temperature is 1450~1530 DEG C, for centrifugal force, so that the peripheral part of cyclic annular roll material is in terms of gravitation multiple
It is set for 180G.After casting, quenching treatment is the hardening heat for being again heated to 1070 DEG C, then carries out air-cooled and quench
Fire, tempering be in order to make remained austenite content less than 10% (in terms of volume %), in 530~570 DEG C of temperature according at
Divide and implement 2 times or 3 times, also, hardness is adjusted to 78~86HS.Hardness test is acquired from obtained loop test material
Piece, hot rolling fatigue testing piece and EBSD measurement test film, implement hardness test, hot rolling fatigue testing and structure observation examination
It tests.
[table 1]
Vickers (test force: 50kgf is used according to the regulation of JIS Z 2244 for obtained hardness test piece
(490N)) vickers hardness hv 50 is measured, and according to JIS conversion table, it is converted into Shore hardness HS.It should be noted that measurement
Point is set to each 10 points, calculates average value after removal peak, minimum, the hardness as the test material.
Hot rolling fatigue testing method is as described below.Hot rolling fatigue testing piece is acquired from obtained loop test material
(outer diameter is 60mm φ, and wall thickness 10mm has chamfering).For hot rolling fatigue testing piece, by using the line of 0.20mm φ
Electro-discharge machining (wire cutting) method of material imports lacking as shown in Figure 1 at two positions (at a distance of 180 ° of positions) of outer peripheral surface
Mouth (depth t:1.2mm, circumferential lengths L:0.8mm).As shown in Figure 1, hot rolling fatigue testing passes through test film and mating member
Double-arc spline slides rotating manner and carries out.It is rotated with 700rpm while carrying out water cooling to test film 1 with cooling water 2, it will
800 DEG C of pairing piece (material: S45C, outer diameter: 190mm φ, width: 15mm, C1 is heated to using high-frequency induction heating coil 3
Chamfering) 4 the test film 1 of rotation is pressed on the load of 980N, while rotate it with 9% sliding ratio.Moreover, making hot rolling
Dynamic fatigue test piece 1 rotates, until two notches 5 imported in the hot rolling fatigue testing piece 1 are damaged, is found out respectively until each
Rotation number of revolutions until notch is damaged, using its average value as hot rolling fatigue life.In addition, being more than by hot rolling fatigue life
It is significantly excellent that 350000 situations are evaluated as hot rolling fatigue life.
For structure observation, in any position of the inside away from outer surface 10mm of cyclic annular roll material, acquisition 10 × 10
The structure observation test film of × 5mm (the wall thickness direction that 5mm is ring), and the face of 10 × 10mm is mirror-finished, use nitric acid
Ethanol solution (5 volume % nitric acid+ethyl alcohol) corrodes 10 seconds or so, then carries out structure observation using optical microscopy.
For the minor axis (minor axis length) of tempered martensite or bainite, from obtained cyclic annular roll material away from outer surface
Any position of the inside of 10mm acquires EBSD measurement test piece (5mm × 10mm × 5mm), carries out mirror to the face of 5mm × 10mm
Face polishing, is measured using EBSD and is found out.Under conditions of acceleration voltage is 15kV, step size is 0.1 μm, to 10000 μm2
Above region carries out EBSD measurement.Using obtained data, as shown in Fig. 2, with the gun parallax of adjacent measuring point be 15 ° with
On position draw boundary line, using the region surrounded by boundary line as a crystal, in aspect of measure, to major diameter be 10 μm with
On the minor axis of 20 crystal be measured, calculate its average value.
The obtained results are shown in tables 2.
[table 2]
| Number | Minor axis (μm) | Hardness (HS) | Hot rolling fatigue life (thousand times) | Remarks |
| 1 | 2.8 | 80 | 387 | Example of the present invention |
| 2 | 2.4 | 82 | 467 | Example of the present invention |
| 3 | 2.0 | 80 | 501 | Example of the present invention |
| 4 | 2.5 | 78 | 481 | Example of the present invention |
| 5 | 2.3 | 85 | 463 | Example of the present invention |
| 6 | 2.9 | 86 | 398 | Example of the present invention |
| 7 | 2.4 | 80 | 432 | Example of the present invention |
| 8 | 1.7 | 81 | 556 | Example of the present invention |
| 9 | 1.0 | 83 | 587 | Example of the present invention |
| 10 | 0.5 | 79 | 643 | Example of the present invention |
| 11 | 2.1 | 78 | 497 | Example of the present invention |
| 12 | 1.4 | 80 | 569 | Example of the present invention |
| 13 | 2.0 | 80 | 521 | Example of the present invention |
| 14 | 0.7 | 83 | 596 | Example of the present invention |
| 15 | 2.3 | 85 | 496 | Example of the present invention |
| 16 | 2.8 | 86 | 223 | Comparative example |
| 17 | 1.2 | 84 | 301 | Comparative example |
| 18 | 2.2 | 82 | 298 | Comparative example |
| 19 | 2.7 | 80 | 190 | Comparative example |
| 20 | 2.6 | 81 | 187 | Comparative example |
| 21 | 2.9 | 81 | 176 | Comparative example |
| 22 | 0.5 | 83 | 332 | Comparative example |
| 23 | 2.8 | 84 | 153 | Comparative example |
| 24 | 1.9 | 86 | 206 | Comparative example |
| 25 | 0.6 | 80 | 321 | Comparative example |
| 26 | 0.5 | 79 | 336 | Comparative example |
| 27 | 3.6 | 78 | 123 | Comparative example |
| 28 | 3.8 | 78 | 146 | Comparative example |
| 29 | 0.5 | 80 | 314 | Comparative example |
In example of the present invention, hot rolling fatigue life is dramatically increased, and exhibits more than 350,000 excellent hot rolling fatigue lives.
In addition, as structure observation as a result, confirmed in all examples of the present invention matrix 85% the above are tempered martensites
And/or bainite structure.
According to the invention it is thus possible to the significantly reduced hot rolling composite roll of the spread speed for producing crackle.It is tied
Fruit is able to suppress rough surface, clast peeling etc. by hot rolling bring surface damage, therefore also can get can be realized and continuously roll
Effect as the extension of distance processed, the raising in roller service life.
Description of symbols
1 test film (hot rolling fatigue test piece)
2 cooling waters
3 high-frequency induction heating coils
4 pairing pieces
5 notches
Claims (2)
1. hot rolling roller cladding material, which is characterized in that there are following compositions: being contained in terms of quality %
C:2.0~3.0%,
Si:0.2~1.0%,
Mn:0.2~1.0%,
Cr:4.0~7.0%,
Mo:3.0~6.5%,
V:5.0~7.5%,
Nb:0.5~3.0%,
Ni:0.05~3.0%,
Co:0.2~5.O%,
W:0.5~5.O%,
And C, the content of Cr, Mo, V, Nb, Ni, W meet following formula (1), and surplus is formed by Fe and inevitable impurity,
The hot rolling in roller cladding material, matrix 85% the above are tempered martensite and/or bainite structure, tempering
The minor axis of martensite or bainite be O.5~3.O μm,
0.05≤(%C-%V × 0.177-%Nb × 0.129-%Cr × 0.099-%Mo × 0.063-%W × 0.033)+(%
Ni)≤4.0 (1)
Wherein, %C, %V, %Nb, %Cr, %Mo, %W, %Ni are the content (quality %) of each element.
2. hot rolling composite roll is formed by outer layer and internal layer welding integrated, the hot rolling composite roll is characterized in that, institute
It states outer layer and is formed by hot rolling described in claim 1 with roller cladding material.
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| JP2016174329 | 2016-09-07 | ||
| JP2016-174329 | 2016-09-07 | ||
| PCT/JP2017/023663 WO2018047444A1 (en) | 2016-09-07 | 2017-06-28 | Roll outer layer material for hot rolling and composite roll for hot rolling |
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| EP (1) | EP3479915B1 (en) |
| JP (1) | JP6292362B1 (en) |
| KR (1) | KR102234330B1 (en) |
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| JP7400771B2 (en) | 2021-05-20 | 2023-12-19 | Ｊｆｅスチール株式会社 | Hot rolling roll outer layer material and hot rolling composite roll |
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- 2017-06-28 KR KR1020197004864A patent/KR102234330B1/en active IP Right Grant
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| TW201812028A (en) | 2018-04-01 |
| TWI655295B (en) | 2019-04-01 |
| EP3479915B1 (en) | 2021-07-21 |
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| BR112019003360A2 (en) | 2019-06-04 |
| KR20190029716A (en) | 2019-03-20 |
| EP3479915A1 (en) | 2019-05-08 |
| JPWO2018047444A1 (en) | 2018-09-06 |
| KR102234330B1 (en) | 2021-03-30 |
| EP3479915A4 (en) | 2019-08-07 |
| JP6292362B1 (en) | 2018-03-14 |
| CN109641250B (en) | 2020-11-03 |
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