CN101905311B - Process for manufacturing cast-rolling roller of rolling mill and cast-rolling roller of rolling mill - Google Patents
Process for manufacturing cast-rolling roller of rolling mill and cast-rolling roller of rolling mill Download PDFInfo
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- CN101905311B CN101905311B CN200910143510.3A CN200910143510A CN101905311B CN 101905311 B CN101905311 B CN 101905311B CN 200910143510 A CN200910143510 A CN 200910143510A CN 101905311 B CN101905311 B CN 101905311B
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Abstract
The invention relates to a cast-rolling roller of a rolling mill with high binding resistance and high crack-diffusing resistance, and a process for manufacturing the same. The process comprises the following steps of: (1), putting a waste molten metal (a), an alloying element (b) and a plurality of chips (c) into a melting furnace; (2), melting the loaded materials at the temperature of between 1,200 and 1,500 DEG C; (3), performing chemical pre-analysis on a sample (d) of the loaded materials; (4) regulating the chemical components (by adding an iron alloy or a pure metal (e)); (5), adding sulfur (f) into the loaded materials; (6) performing another chemical pre-analysis on a new sample (g) of the loaded materials; (7) regulating the chemical components (h); (8), adding at least one rear earth metal (k) into a casting ladle (j); (9), transporting the molten metal from the melting furnace to the casting ladle (j); (10), transporting materials in the casting ladle to casting equipment; and (11) forming a half-finished product of the roller.
Description
Technical field
The present invention relates to a kind of production technology of high ageing-resistant rolling mill Casting Roller and pass through the roller of this explained hereafter.More particularly, the present invention relates to sulphur, as a kind of nexus element, import to high chromium white iron and multi-component white iron, to form the sulfide phase particle in microstructure in the mode of controlling, thereby can utilize the rolling mill casting roll of the high serviceability of this class manufacture of materials.
Background technology
As is known to the person skilled in the art, rolling mill roller is the instrument for rolling mill practice, by means of it, smooth and long product of metal material is shaped, and is mainly steel.As any forming tool, be that rolling mill roller directly contacts those formed products, thereby cause the ever-increasing aging of its surface between the operating period and after a certain operating period, need subsequently to recover this surperficial primary condition.The mode that this recovery is removed aging superficial layer by machining realizes, and needs like this rolling mill to shut down and is also replaced with the new roller of having repaired to extract aging roller out.
Therefore, the serviceability of the quality of this rolling mill practice and productivity and rolling mill roller is closely related, because:
(a) quality of milling material is mainly by its accuracy of shape and repeatable decision, and it directly reflects geometry and the state on roller surface;
(b) the uninterrupted service number of times that the productivity of rolling mill partly can be stood by this rolling mill roller is determined; make the quality of rolled products remain on minimum standard shelves (shut down with the minimum number of times of roll change); these become possibility by the ageing-resistant roller of height, mean the productivity that has directly improved production line.
In the terminal stage of the technique of hot-rolled strip, use a set of roll assembly (" roller frame ") that is in line and arranges, it is also mm finishing mill unit.The quantity of roll stand can change according to the implication of the function of design and rolling mill itself.
Owing to there is the difference of aging coefficient between the first roller frame and position, end roller frame, therefore also adopt the roller of different materials.
The aging of rolling mill roller is a kind of process, it is characterized by several obvious loss pattern of effect simultaneously: wearing and tearing, oxidation, adheres to and heat fatigue.But, we know this loss pattern in each roller frame of rolling mill machine row one or both be significant: in the first roller frame, wherein at the temperature of 1,000 ℃ of left and right, be shaped, heat fatigue oxidative phenomena acts on more consumingly; In the roller frame of position, end, it is shaped at the temperature of 700 ℃ of left and right, and friction and adhesion are remarkable.
Another shortcoming with the mm finishing mill unit of conventional roll is, with rolling mill roller surperficial aging gradually time, the unforeseen damage being caused by the operating accident of mm finishing mill unit, the for example adhesion (" glue " or " weldering ") of rolling band on roller, and the breaking of unsettled diffusion into the surface or roller top layer last time, cause rolling mill operation to be stopped transport to roller is removed.Two operating characteristic of position, the end roller frame of mm finishing mill unit make the roller on it be more vulnerable to this damage:
(a) low rolling temperature (determine that oxide structure is at the lip-deep low energetics of roller, it is due to the compromised performance of roller of anti-adhesion);
(b) the lower thickness of rolling band.
Being designed to the rolling mill roller of mm finishing mill unit, in most cases, is compound casting, and " sandwich layer " that one " the outer protection layer " that it is made up of antifriction alloy and spheroidal graphite cast-iron or grey cast-iron form forms.Be generally used for technique centrifugal casting in metal mold of the product of this Dual-metal roller: protective layer material is poured in mould, and due to the effect of centrifugal force, it is evenly distributed to mould inner surface, forms the skin (or protective layer) with thickness between 40mm and 120mm; After protective layer is fixed, core material is poured in same mould and continues rotation, filled.In the time contacting with the inner surface of the protective layer solidifying, a small amount of volume of this protective layer of core material double teeming (along the about 10mm of its whole inner surface), thus between protective layer and core body, producing metallurgical connection, it is called contact-making surface.
For this first place roll stand, wherein oxidation and heat fatigue coefficient are remarkable, have the roller that is also the work layer (protective layer) that high-speed steel forms by high chromium white iron and multi-component white iron; Therefore, this roller has at least about the serviceability of roller that doubles chilled cast iron, and the roller that this chilled cast iron forms is generally used for position, end roller frame, and wearing and tearing and sticking coefficient are dominant there, and rolling band adhesion is also frequent.
Therefore, another shortcoming of the mm finishing mill unit (position, end roller frame) of traditional roller is the first roller frame and being out of step that position, end roller frame need to be changed, thereby sacrifice the prolongation of possible activity duration, if and obvious described inconsistent can successfully elimination, the roller of last roller frame is changed number will be increased the productivity of minimizing and rolling mill.
When in the past 20 years of the alloy of the roller protective layer of the first roller frame for mm finishing mill unit when fast development, the Fe-Cr-Si-Ni-C alloy in the roller protective layer of position, end roller frame, is also chilled cast iron, has used and has exceeded 40 years.The microstructure of this material has tempered martensite punch die (tempered martensite die), and it has inferior level carbide M
3c and eutectic carbide M
3the interdendritic net (volume ratio about 25%) of C, bulk or globular graphite are also interdendritic (volume ratios about 3%) in addition.This microstructure is the result of the balance of properties of the alloying element of its chemical composition: silicon and nickel are graphite production components, chromium be firm carbide production component and, in addition, nickel also determines hardenability, need to prevent the cooling middle formation pearlite (perlite) after casting.
Being suitable for the long life of the chilled cast iron of the roller of finishing roll frame, is because until the existing date, its microstructure represented, the optimal coordination scheme between the mar proof being caused by punch die and resistance to adhesiveness and the unstable diffusion of the micro-crack that caused by graphite.Be appreciated that, graphite serves as lubricant (reduce and adhere to) and reduces stress at micro-crack end and concentrate in roller or rolling band contact-making surface, has therefore reduced its diffusion rate.
Some significant development are implemented in the production line/technique of the roller of position, the end roller frame of the hot-rolling mill of hot-rolled strip.Based on the material of same concept, the most representative, namely chilled cast iron, we can adopt those materials, and it comprises that adding alloying element is used to form hard inferior phase particle, and this particle only comprises the thin carbide of dispersion.Consolidation technique also changes, to reach meticulousr structure.
Keeping other performance characterization parameter ground simultaneously, the demand of the user that manufacturer makes great efforts to meet this roller to its higher mar proof, this effort is that its hardness is greater than carbide M based on using hard alloy element to form eutectic and/or two level carbides
3c, for example, M
7c
3with MC class carbide.
But, it is found that it is to promoting minimizing and the inhibition of graphite-structure, and therefore, reduce the unstable diffusion of this resistance to adhesiveness and micro-crack, be reactive; , the compromise proposal of generation does not represent that rolling mill machine row have improved productivity ratio.
Patent PCT/US1996/09181 has disclosed a kind of production method for chilled cast iron, and this chilled cast iron is by weight the niobium between additional 0.3% and 6% and have the serviceability that replaces chilled cast iron.The existence of niobium impels the formation of the free particles of primary carbide NbC, its hardness increases, and do not affect graphite-structure, therefore the unstable diffusion (structure of carbide NbC forms and occurs in than forming the higher temperature of graphite-structure, and therefore not competition between them) that has increased mar proof and kept resistance to adhesiveness and micro-crack.
But the interpolation of niobium is in fact 0.6% left and right, therefore, high level is meaned in the time that roller is poured into a mould, and need to improve pouring temperature, therefore makes this technique unrealistic.At this addition, the increase of mar proof is restricted, because the volume ratio of eutectic carbide NbC is limited in lower than 1% in this microstructure, in this external punch die, lacks separating out of carbide NbC.
Except this object, only have minority rolling mill to use multicomponent white cast-iron in the roller frame of position, end, this roller frame passes through centre spinning or CPC(" direct casting covering " technique, or generally, " by continuous casting coating ") obtain.But the problem that this milling train faces is that the composition of this class alloy does not comprise graphite, has therefore damaged resistance to adhesiveness.
Summary of the invention
In order to overcome the shortcoming in the state of the art, in the present invention, the object of this technique and this product discloses.
Therefore, the object of this invention is to provide a kind of technique of rolling mill Casting Roller product, to prevent the adhesion of rolling band, and the wear-resistant unstable expansion with preventing crackle.
In order to achieve the above object, provide a kind of and use the method for the alloy of multi-component white cast-iron or high-chromium white cast iron in the roller of roller frame (finishing roll frame), thereby the problem that lacks graphite (lubricated element) can be eliminated.
The embodiment of the present invention provides a kind of technique of producing rolling mill casting roll, comprises step:
-useless liquid metal (a), alloying element (b) and many chips (c) are to the importing (1) of melting furnace;
The fusing (2) of-described loaded stock;
The interpolation (5) of sulphur (f) in-described loaded stock;
-add (8) at least one rare earth metal (k) to ladle (j);
-liquid metal is (i) passed on to (9) to ladle (j) from melting furnace;
-pass on the expecting to Casting Equipment (10) of ladle, thus semi-finished product rollers (11) formed.
Wherein, described liquid metal (a) comprises carbon, chromium, molybdenum, tungsten, vanadium, manganese and silicon.
The components by weight percent of described manganese from 0.1% to 2.0%, the components by weight percent of described sulphur from 0.1% to 1.0%, described sulphur and manganese are proportional, ratio is 2:1(Mn:S).
The content of this rare earth metal be in this ladle weight of liquid metal than 0.2% 50%, preferably cerium of this rare earth metal.
The rolling mill casting roll that the embodiment of the present invention also provides a kind of technique provided by the invention to manufacture, is used in the finishing roll frame of rolling mill practice.
Accompanying drawing explanation
The technological principle schematic diagram of the production rolling mill casting roll that Fig. 1 provides for the embodiment of the present invention.
The specific embodiment
The invention provides a kind of technique of rolling mill Casting Roller product, to prevent the adhesion of rolling band, and the wear-resistant unstable expansion with preventing crackle.
In order to achieve the above object, provide a kind of and use the method for the alloy of multi-component white cast-iron or high-chromium white cast iron in the roller of roller frame (finishing roll frame), thereby the problem that lacks graphite (lubricated element) can be eliminated.
The conventional steps of producing rolling mill roller technique by high-chromium white cast iron or multicomponent white cast-iron is:
A) import useless liquid metal, alloy compositions and many fragments are to melting furnace;
B) melt described loaded stock;
C) mixture producing is injected to ladle;
D) material in ladle is delivered to Casting Equipment, therefore forms semi-finished product roller.
This present invention includes, a kind of method of innovation, and as shown in Figure 1, step is:
-importing (1) useless liquid metal (a), alloying element (b) and many fragments (c) are to melting furnace;
-fusing (2) this loaded stock;
-chemical preanalysis (3) loaded stock sample (d), to adjust (4) this chemical composition (by adding (e) ferroalloy or simple metal);
-add (5) sulphur (f) to this loaded stock;
The fresh sample (g) of-chemical preanalysis (6) loaded stock, to adjust (7) chemical composition (h);
-add (8) at least one rare earth metal (k) to ladle (j);
-liquid metal is (i) passed on to (9) to ladle (j) from melting furnace;
-material in ladle is delivered to Casting Equipment (10), therefore form semi-finished product roller (11).
The interpolation of sulphur in technique, be combined with at least one rare earth metal, make the sulfide phase particle of formation control in microstructure become possibility, obtained a kind of better mar proof therefore unexpectedly, with better anti-adhesive, and prevent better the performance of unsettled Crack Extension.This be due to, vanadium, chromium, molybdenum and tungsten component are present in the chemical composition of multicomponent white cast-iron, and being present in a large number in high-chromium white cast iron in them, cause forming eutectic and time level carbide (wherein " HV " represents stiffness units, i.e. " Vicker-hardness ") with the increase hardness between 2000HV and 2800HV hardness.Therefore, the higher mar proof of this roller promotes by punch die and eutectic carbide, this sulfide is as graphite substitute, on this roller, rolling band contact-making surface, serve as lubricant, therefore reduced the possibility that rolling band adheres to, and by this way effect reduced fracture tip stress concentrate, therefore weakened its diffusion rate.
In this composition, sulphur component and manganese component proportional (ratio Mn:S=2:1).
The chemical composition of original liquid metal may include, but are not limited to this, 1.0% to 3.0% carbon, and up to 18% chromium, 8.0% molybdenum, 8.0% tungsten, 10% vanadium, 2.0% manganese, and 2.0% silicon.The final component of the alloy of this roller also can comprise up to 1.0% nickel and 0.08% phosphorus, and in addition, the interpolation content of sulphur is by weight can from 0.1% to 1.0% in process of production.
The component of this rare earth metal, be in ladle weight of liquid metal 0.2% 50%.Preferably, this rare earth metal is cerium.
This technological temperature value depends on the value of this initial loading material containing, can between about 1.200 ℃ and 1.500 ℃, change.
Therefore, this invention provides in technique to the advantage of adding sulphur in rolling mill casting roll product, makes rolling mill roller during use have high surperficial ageing resistace.
Therefore, the interpolation of sulphur makes small amount and uses roller to become possibility, and the demand that returns to identical primary condition reduces, therefore, and the operation that has extended rolling mill still less shutting down in the operation of rolling, and provide better Surface Machining for final products.
Form shows the chemical composition of material in preferred embodiment, and this material is for the manufacture of the protective layer of rolling mill casting roll in the present invention with higher ageing resistance, as follows:
Wherein
Alloy A=multi-component white cast-iron, has another name called high-speed steel;
Alloy B=high-chromium white cast iron; With
Q.s.p.=q.s.
*=manganese component (Mn) is proportional with the sulfur content in the formation of this sulfide phase.
Although the preferred ingredient of this scheme has been described and diagram, in it may be noted that and not departing from the scope of the present invention, other scheme also can realize.We have the example changing in the time that mischmetal(l) is increased, described interpolation is preferably carried out in the bottom of ladle (j), to reach better result, but also can directly be undertaken by metal jet, by when casting, or improve the component of Casting Equipment.
Another distortion of the present invention is that, except spun casting, disclosed identical material (product) can be used to by CPC(direct casting covering) manufacture roller, this is in existing application before.
The embodiment of the present invention also provides a kind of rolling mill casting roll of manufacturing by above-mentioned technique, and this rolling mill casting roll is used in the finishing roll frame of rolling mill practice.
Relate to the current more practical optimal case that is considered as although the present invention has described, it will be understood that the invention is not restricted to the embodiments described, but be included in multiple variations in claim spirit and scope and equivalent adjustment.Therefore, the protection domain of claim should be according to a kind of wide explanation, to comprise above-mentioned similar change and adjustment.
Claims (5)
1. a rolling mill casting roll, is characterized in that, comprises the protective layer that comprises high-chromium white cast iron; the carbon that described high-chromium white cast iron comprises 2.0%-3.0%, the chromium of 10%-18%, the sulphur of 0.1%-0.8%; be less than 3% molybdenum, be less than 1.0% tungsten, be less than 1.0% vanadium; be less than 2.0% manganese; be less than 1.0% silicon, be less than 1.0% nickel, be less than 0.08% phosphorus; 0.1% cerium and the iron of q.s, and wherein said manganese and described sulphur are with 2:1(Mn:S) ratio proportional.
2. a rolling mill casting roll, is characterized in that, comprises the protective layer that comprises multi-component white cast-iron; the carbon that described multi-component white cast-iron comprises 1.5%-2.5%, the chromium of 3.0%-10%, the molybdenum of 2.0%-8.0%; the tungsten of 2.0%-8.0%, the vanadium of 2.0%-10%, the sulphur of 0.1%-0.8%; be less than 2.0% manganese; be less than 1.0% silicon, be less than 1.0% nickel, be less than 0.08% phosphorus; 0.1% cerium and the iron of q.s, and wherein said manganese and described sulphur are with 2:1(Mn:S) ratio proportional.
3. a technique of producing rolling mill casting roll according to claim 1 and 2, is characterized in that, comprises step:
-useless liquid metal (a), alloying element (b) and many chips (c) are to the importing (1) of melting furnace and formation loaded stock;
The fusing (2) of-described loaded stock;
The interpolation (5) of sulphur (f) in-described loaded stock;
-add (8) at least one rare earth metal (k) to ladle (j);
-liquid metal is (i) passed on to (9) to ladle (j) from melting furnace;
-pass on the expecting to Casting Equipment (10) of ladle, thus the protective layer of semi-finished product rollers (11) formed.
4. technique as claimed in claim 3, is characterized in that, this rare earth metal is cerium.
5. a rolling mill casting roll according to claim 1 and 2 purposes in the finishing roll frame of rolling mill practice.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910143510.3A CN101905311B (en) | 2009-06-03 | 2009-06-03 | Process for manufacturing cast-rolling roller of rolling mill and cast-rolling roller of rolling mill |
| HK11105006.8A HK1150997A1 (en) | 2009-06-03 | 2011-05-20 | A process for the production of rolling mill cast rolls and a rolling mill cast roll |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910143510.3A CN101905311B (en) | 2009-06-03 | 2009-06-03 | Process for manufacturing cast-rolling roller of rolling mill and cast-rolling roller of rolling mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101905311A CN101905311A (en) | 2010-12-08 |
| CN101905311B true CN101905311B (en) | 2014-07-02 |
Family
ID=43260978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910143510.3A Active CN101905311B (en) | 2009-06-03 | 2009-06-03 | Process for manufacturing cast-rolling roller of rolling mill and cast-rolling roller of rolling mill |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101905311B (en) |
| HK (1) | HK1150997A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3155498A (en) * | 1961-12-27 | 1964-11-03 | Bethlehem Steel Corp | Ductile iron and method of making same |
| CN1082950A (en) * | 1992-03-06 | 1994-03-02 | 日立金属株式会社 | Composite roll and its production method |
-
2009
- 2009-06-03 CN CN200910143510.3A patent/CN101905311B/en active Active
-
2011
- 2011-05-20 HK HK11105006.8A patent/HK1150997A1/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3155498A (en) * | 1961-12-27 | 1964-11-03 | Bethlehem Steel Corp | Ductile iron and method of making same |
| CN1082950A (en) * | 1992-03-06 | 1994-03-02 | 日立金属株式会社 | Composite roll and its production method |
Also Published As
| Publication number | Publication date |
|---|---|
| HK1150997A1 (en) | 2012-01-20 |
| CN101905311A (en) | 2010-12-08 |
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