CN101274359B - Electromagnetic centrifugal casting quick-cutting steel composite roller operational layer material - Google Patents
Electromagnetic centrifugal casting quick-cutting steel composite roller operational layer material Download PDFInfo
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- CN101274359B CN101274359B CN2007100385733A CN200710038573A CN101274359B CN 101274359 B CN101274359 B CN 101274359B CN 2007100385733 A CN2007100385733 A CN 2007100385733A CN 200710038573 A CN200710038573 A CN 200710038573A CN 101274359 B CN101274359 B CN 101274359B
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Abstract
The invention discloses a material of the working layer of an electromagnetic centrifugal casting high speed steel composite roller, the composition mass percentage of which is as follows: 1.8 to 2.5 of C, 3 to 10.0 of W, 2 to 4 of Mo, 4.0 to 7.0 of Cr, 0.5 to 2 of V, 0.03 to 0.5 of RE, less than or equal to 1 of Si, less than or equal to 1 of Mn, and marginal Fe and unavoidable impurities; wherein, an electromagnetic field with the magnetic strength of 0.21T to 0.30T is applied during the centrifugal casting and solidifying process of the roll barrel working layer. The high carbon, high tungsten and high speed steel material of the invention can produce high carbon, high tungsten and high speed steel composite rollers by adopting an electromagnetic centrifugal casting technique and by replacing V with W, thereby not only eliminating the macroscopic segregation of a cast structure and effectively controlling the even distribution of MC carbide, but also obviously improving the serviceperformance of the high speed steel composite roller.
Description
Technical field
The present invention relates to the metallurgical roller field, particularly a kind of electromagnetic centrifugal casting quick-cutting steel composite roller operational layer material that is used for the hot rolling working roll.
Background technology
Because the applying working condition of hot rolling working roll is relatively harsher, ringing, especially the leading portion frame of bearing high temperature, shock loading and cooling water are very high to the serviceability requirement of working roll.
In recent years, because the good characteristic of the compound hot roll of centrifugal casting quick-cutting steel has obtained applying fast.The feature of this composite roll is the working lining with one deck high-speed steel material, has added alloying elements such as a large amount of Cr, Mo, V, W, Nb in the high-speed steel material, can form MC, M
2C and M
6Polytype alloy carbides such as C, hardness are very high, and evenly refinement, have the excellent abrasive energy.
Because the different-alloy element forms dissimilar alloy carbides,, high Cr series, high Mo and dissimilar centrifugal casting quick-cutting steel composite rollers such as V series, high Co series have been formed at present according to different service condition requirements.
Each steel rolling mill of Nippon Steel, Korea S Pu Xiang Guangyang factory, Kawasaki, Japan Chiba factory, hot fine rolling F1～F5 frame the working roll of Canada DOFASCO factory almost all adopts high-speed steel material composite roll, use is the result show: the abrasion resistance properties of high-speed steel hot roll compares high chromium cast iron, high Cr cast steel roll improves 3～5 times, the roll surface roughness keeps performance, high-temperature stability is excellent more, the roll change cycle prolongs at double, simultaneously can realize free regulation rolling, greatly reduce the roller consumption, improved band steel control accuracy and surface quality, high-speed steel hot rolling working roll is applied and is become inexorable trend.
At present, compound high speed steel roll mainly adopts centre spinning method production, and liquid metal is not subjected to other inside to obligate the effect of power except centrifugal force, various carbide former skewness.V and C are the main forming elements of MC, in order to produce high rigidity and wear-resisting principal phase---and it is high-speed steel that MC type carbide, operational layer material generally adopt the high vanadium of high-carbon.Because the density of W, Mo alloy is than molten metal height, under action of centrifugal force, W, Mo element form sheet M in outer enrichment in the centrifugal preparation process
2The C carbide, and the density of V alloy is lower than molten metal, V element forms spherical shape MC carbide in the internal layer enrichment, produce alloying element segregation and carbide gross segregation, have a strong impact on the roll wearability, can't produce the high tungsten of high-carbon is high-speed steel, also can't obtain the high W type MC carbide of red hardness excellence.In order to improve the whole serviceability of roll, have only higher Nb element, the V element (about 6%) of adding could form enough MC type carbide, guarantee the overall wear resistance of roll, this can't solve the segregation problem at all, and it is thick also easily to produce carbide simultaneously, causes spalling of rolls, also influence the red hardness of roll, high temperature hardness is low, and high temperature abrasion resistance is poor, has reduced the service life of roll.
In the electromagnetic centrifugal casting process, the centrifugal force that Luo Lunzili that electromagnetic field effect produces and rotation produce, liquid metal is in sufficient constraint and stirring, thereby make various MC type carbide formers be evenly distributed, MC type carbide forming core point increases and evenly distributes, the segregation of alloying element and the gross segregation of carbide have been suppressed, can form simultaneously the MC type carbide of rich W, only need an amount of W element and a spot of V element just can reach desirable high-temperature wearable effect, improved the more excellent W constituent content of red hardness, reduced V element content, can produce the high tungsten of high-carbon is high-speed steel, is rich in the high W type MC carbide of red hardness excellence; In addition, the Luo Lunzili that electromagnetic field produces can the refinement microstructure, can also the refinement carbide, and tiny carbide makes wearability further improve.
Chinese patent 03114582.5 has been invented a kind of centrifugal casting quick-cutting steel roll manufacture method, in centrifugal casting of body of roll molten steel and process of setting, adding magnetic induction intensity is the 0.03T-0.20T electromagnetic field, thereby obtain the high carbon high wolfram fast steel rolling composite roll, composition is even, segregation-free, dense structure, tiny, every performance obviously is better than common high-speed steel roll.
Chinese patent 93103678.X is that a kind of composite roll and its production method have been invented by Hitachi Metal Co., Ltd., the formation of working lining part cast iron is by weight: 1.0-3.0%C, 2.0% or lower Si, 2.0% or lower Mn, the Cr of 2.0-15.0%, 10.0% or lower Mo, the V of 2.0-8.0%, all the other are Fe and unavoidable impurities, do not contain W and Nb in institute's invention material, thereby the problem that certainly exists microstructure segregation and wear no resistance.
Chinese patent 97100083.2 discloses a kind of production method of centrifugal composite high-speed steel roller, and principal character is that the skin of the roll material is a high-speed steel, and the core of the roll material is an alloy nodular cast iron, and two kinds of different materials adopt centrifugal casting to be composited.Outer molten steel adds the rare earth processing of going bad before cast, the addition of rare earth is 0.03-0.5%, and it is low that the present invention has a production cost, and advantages such as institute's product roll long service life are applicable to the centrifugal compound manufacturing of high-speed steel roll.
Chinese patent 03140532.0 discloses a kind of high-speed steel composite ring, and the collars skin is a high-speed steel, and the collars core is an alloy nodular cast iron, it is characterized in that: the outer field chemical composition of collars (weight %) is: C 1.2-2.5%, Si 0.3-1.5%, Mn 0.4-1.0%, Cr 3.0-6.0%, Mo 1.0-4.0%, V 1.0-4.0%, W 0.5-3.0%, Nb 0.5-2.0%, Ti 0.01-0.5%, RE 0.01-0.5%, P＜0.05%, S＜0.05%, surplus is Fe; The chemical composition of collars core (weight %) is: C 3.0-3.8%, and Si 2.2-3.2%, Mn 0.3-0.8%, Ni 0.2-2.0%, Cr＜0.3%, Mo＜0.3%, Mg 0.03-0.1%, RE 〉=0.03%, P＜0.1%, S＜0.03, surplus is Fe.This invention has that cost is low, hardness is high, anti-wear performance is good, long service life, advantage that operating rate of rolling mill is high, but W, Nb are controlled at lower content, must influence its serviceability.
The objective of the invention is to propose a kind of electromagnetic centrifugal casting quick-cutting steel composite roller operational layer material, the high carbon high wolfram fast steel rolling material, adopt electromagnetic certrifugal casting technology can make the high carbon high wolfram fast steel rolling composite roll, not only eliminated the gross segregation of cast sturcture, control the MC carbide effectively and evenly distribute, and improved the serviceability of compound high speed steel roll significantly.
For achieving the above object, technical scheme of the present invention is, a kind of electromagnetic centrifugal casting quick-cutting steel composite roller operational layer material, and its composition quality percentage is:
C 1.8～2.5
W 5.5～10.0
Mo 2～4
Cr 4.0～7.0
V 0.5～1.5
RE 0.03～0.5
Si≤1
Mn≤1
Surplus is Fe and inevitable impurity;
In centrifugal casting of body of roll working lining and process of setting, apply the electromagnetic field that magnetic induction intensity is 0.21T-0.30T.
Wherein, C 1.8～2.5%, improve a C constituent content part and form carbide, increase carbide quantity in the working lining tissue, and a part is fused to matrix admittedly;
W 5.5～10.0%, improve the W constituent content, can be under the effect of electromagnetic field, a part replaces the effect of V, not only form MC, the M2C type carbide of disperse distribution but also be fused in the matrix, realize the precipitation strength and the precipitation strength of working lining tissue, make the high-speed steel working lining have desirable hardness, wearability, red hardness, heat endurance and non-oxidizability;
V 0.5～1.5%, the quenching degree of crystal grain thinning, raising material, and high tempering process secondary is separated out a certain amount of MC type carbide, improve material wear ability and obdurability, reduced alloying element V content, can eliminate the gross segregation of cast sturcture, controlled the MC carbide effectively and evenly distribute.
Mo 2～4%, promote the post-curing of material, form M
2C type carbide, the wearability of raising material.
Cr 4.0～7.0%, guarantee the quenching degree of material, form double carbide with element actings in conjunction such as W, Mo, V, improve the wearability of material.
RE 0.03～0.5%, and rare earth element mainly is to the molten steel processing of going bad, and purifies simultaneously and the tissue of refinement material.
The roller core material is an alloy nodular cast iron.In centrifugal casting of body of roll working lining and process of setting, apply the electromagnetic field that magnetic induction intensity is 0.21T-0.30T, molten steel is played the effect of electromagnetic agitation, reduce the radially poly-partially of the movement velocity of metal and alloying element, effectively control the alloying element segregation, realize the directional solidification and the growth of tissue, produce high rigidity and the wear-resisting MC type carbide of rich W, carbide can evenly distribute, segregation-free, dense structure, tiny, and every performance is better than common centrifugal casting quick-cutting steel roll.Electromagnetism intensity is too low, can not play the effect of control segregation, and electromagnetism intensity is too high, causes tissue looseness easily.
The present invention is that electromagnetic field combines with the rotation field of force of centrifugal casting, produce function composite by electromagnetic stirring, cause alloying elements distribution even, avoided the gross segregation of MC carbide in the centrifugal casting process, therefore, it is obviously different that electromagnetic centrifugal casting quick-cutting steel alloy composition and conventional centrifugal casting have, and can reduce the content of alloying element V greatly, and the compound high speed steel roll overall performance of preparation is significantly improved.
According to the configuration of different roll specifications and equipment, that centrifugal casting machine can adopt is vertical, inclined or horizontal centrifugal casting machine, the cast body of roll earlier during cast, solidify a period of time after, pour into a mould roller core again.
The roll manufacture method still adopts molten steel melting, centrifugal casting, towards the process route of core, heat treatment and machining, in molten steel centrifugal casting and process of setting, apply induction field in the mold outside, obtain the electromagnetic centrifugal cast roller stock of even tissue, excellent performance.
Beneficial effect of the present invention:
Do not changing under the Technology for Heating Processing condition, high-speed steel material of the present invention during non-electromagnetic field centrifugal casting, is separated out the black carbide of gathering in a large number, is easy to generate crackle in the use and carbide comes off; When electromagnetic field centrifugal casting, separate out white tiny carbide even, that disperse distributes in a large number, great changes have taken place in the structure of MC type carbide, composition, the W element directly substitutes V element and has formed the very high MC type carbide of red hardness, organize segregation-free, make the red hardness and the wearability of roll material increase substantially, have excellent serviceability.
Description of drawings
Fig. 1 is the carbide morphology and the distribution schematic diagram of Comparative Examples roll;
Fig. 2 is the carbide morphology and the distribution schematic diagram of the embodiment of the invention 3 rolls.
The specific embodiment
Embodiments of the invention are referring to table 1.
Table 1 unit: mass percent
In centrifugal casting of body of roll working lining and process of setting, apply the electromagnetic field that magnetic induction intensity is 0.21T-0.30T, with W for V, carbide can evenly distribute, segregation-free, dense structure, tiny, every performance is better than common centrifugal casting quick-cutting steel roll, and wherein: anti-wear performance and impact flexibility improve more than 30%, anti-accident performance is improved greatly.
As seen from Figure 1, Figure 2, Technology for Heating Processing is constant, under the non-electromagnetic field centrifugal casting condition, separates out the black carbide of gathering in a large number; 0.22T under the electromagnetic field centrifugal casting condition, the white tiny carbide that a large amount of diffusion-precipitations distribute, great changes have taken place in the structure of MC type carbide, composition, the W element directly substitutes V element and has formed the very high MC type carbide of red hardness, make the red hardness and the wearability of roll material increase substantially, guaranteed the technology and the serviceability of high carbon high wolfram fast steel rolling.
Electromagnetic centrifugal casting quick-cutting steel composite roller of the present invention, be applicable to the hot fine rolling working roll, also be applicable to hot rolling breaking down frame working roll, for other similar operating mode rolls good result of use is arranged also, also can be applicable to cold roll, also have promotional value and application prospect for the nonferrous metal rolling mill roll.
Claims (1)
1. electromagnetic centrifugal casting quick-cutting steel composite roller operational layer material, its composition quality percentage is:
C 1.8～2.5
W 5.5～10.0
Mo 2～4
Cr 4.0～7.0
V 0.5～1.5
RE 0.03～0.5
Si ≤1
Mn ≤1
Surplus is Fe and inevitable impurity;
Adopt centrifugal casting technique, body of roll working lining applies the electromagnetic field that magnetic induction intensity is 0.21T～0.30T in centrifugal casting and process of setting.
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| CN103357839A (en) * | 2012-03-26 | 2013-10-23 | 卓然(靖江)设备制造有限公司 | Rotary type electromagnetic centrifugal casting machine |
| CN103170392B (en) * | 2013-01-23 | 2015-09-30 | 北京奥邦焊业有限公司 | Vertical bimetallic grinding roller |
| CN105750529B (en) * | 2016-04-01 | 2017-10-31 | 枣庄瑞兴机械制造有限公司 | A kind of high tungsten high abrasion compound high speed steel roll and preparation method thereof |
| CN110304634A (en) * | 2019-07-05 | 2019-10-08 | 昆明理工大学 | A kind of method of energy-efficient purifying industrial silicon |
| CN112359293B (en) * | 2020-11-23 | 2022-06-17 | 武汉轻工大学 | Mo-V series high-speed steel roll collar for KOCKS bar mill and preparation method thereof |
| CN114921729B (en) * | 2022-06-02 | 2023-04-18 | 江苏应用元素科技有限公司 | High-speed steel cutter wire and preparation method thereof |
| CN117127098A (en) * | 2022-06-02 | 2023-11-28 | 宿迁学院 | Preparation method of powder metallurgy high-speed steel wire |
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|---|---|---|---|---|
| CN1559726A (en) * | 2004-02-19 | 2005-01-05 | 清华大学 | Method of electromagnet continuoces casting of high spped steel composite roller |
| CN1803325A (en) * | 2005-09-13 | 2006-07-19 | 安泰科技股份有限公司 | High speed steel composite roll and its preparing method |
| CN1847439A (en) * | 2006-04-30 | 2006-10-18 | 郑州航空工业管理学院 | Guide and guard roller for guiding steel billet in high speed wire rolling machine and its making process |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1559726A (en) * | 2004-02-19 | 2005-01-05 | 清华大学 | Method of electromagnet continuoces casting of high spped steel composite roller |
| CN1803325A (en) * | 2005-09-13 | 2006-07-19 | 安泰科技股份有限公司 | High speed steel composite roll and its preparing method |
| CN1847439A (en) * | 2006-04-30 | 2006-10-18 | 郑州航空工业管理学院 | Guide and guard roller for guiding steel billet in high speed wire rolling machine and its making process |
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