CN101695714B - Cast steel back-up roller and preparation method thereof - Google Patents
Cast steel back-up roller and preparation method thereof Download PDFInfo
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- CN101695714B CN101695714B CN2009102361535A CN200910236153A CN101695714B CN 101695714 B CN101695714 B CN 101695714B CN 2009102361535 A CN2009102361535 A CN 2009102361535A CN 200910236153 A CN200910236153 A CN 200910236153A CN 101695714 B CN101695714 B CN 101695714B
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Abstract
The invention discloses a cast steel back-up roller and a preparation method thereof, and belongs to the technical field of steel rolling rollers. High alloy steel taken as a working layer material of a roller and graphitic steel taken as a core material of the roller are completely metallurgically bonded to each other. The high alloy steel material comprises the following chemical components in percent by weight: 0.4 to 0.6 percent of C, 0.4 to 0.6 percent of Si, 0.5 to 0.7 percent of Mn, 4.5 to 5.5 percent of Cr, 1.0 to 1.2 percent of Ni, 0.6 to 0.8 percent of Mo, 0.03 to 0.08 percent of Re, less than or equal to 0.35 percent of P, less than or equal to 0.030 percent of S and the balance of Fe; and the graphitic steel material comprises the following chemical components in percentage byweight: 1.4 to 1.6 percent of C, 1.7 to 1.9 percent of Si, 0.4 to 0.6 percent of Mn, 0.5 to 0.7 percent of Ni, less than 0.2 percent of Cr, less than 0.2 percent of Mo, less than 0.035 percent of P, less than 0.030 percent of S, and the balance of Fe. The cast steel back-up roller and the preparation method thereof have the advantages that: the online service life of the roller and the operating rate of a rolling mill are greatly improved; simultaneously, the serious consequence of scrap caused by abnormal nodularizing and poor bonding of the roller due to high-temperature tapping and high-temperature casting of the molten iron of nodular cast iron is avoided; and the manufacturing cost of the roller is reduced.
Description
Technical field
The invention belongs to steel rolling roll technology field, a kind of cast steel back-up roller and preparation method thereof particularly is provided, mainly be applicable to the manufacturing of the cast steel back-up roller of using in the belt steel rolling.
Background technology
Along with developing rapidly of steel and iron industry, China comprises that at present the production capacity of ribbon steel hot rolled strip mill has arrived 2.8 hundred million tons, and roll is a large amount of vitals that consume during steel rolling is produced, and that is to say that no roller is good-for-nothing.Therefore, the quality of roll quality not only affects the surface quality of stocking, but also affects the operating rate of milling train, is directly restricting economic benefit of enterprises.In existing production technology, the back up roll that these milling trains use adopts cast-in-block alloy half steel roll usually, and alloy part cast steel roll, forged steel roll and compound ferrosteel roll.The common problem that back up roll in use exists is the roll surface crackle, peel off and fall destructive damage the such as shoulder, according to statistics, cause every year the consumption of this improper property damage to account for more than 40% of whole back up roll consumption, cause very big influence to economic benefit of enterprises.The main cause that these problems occur is that existing back up roll material is because alloy content is low, matrix is thick, low, the poor toughness of anti-contact fatigue strength, in use be subjected under the effect of alternation repeatedly of powerful draught pressure of milling train and working roll recurvation power, make fatigue stress that roll surface is subjected to and shear stress exceed the strength degree of material and cause crackle, peel off and fall destructive damage the such as shoulder.Although patent application: " a kind of high-alloy centrifugal compound cast steel supporting roll and the manufacture method thereof " set forth in 2,009 1 0001054.9 is feasible selecting for use of roll working layer, but, the weak point of this invention technology is that core of the roll tensile strength is low on the one hand, in use occurs roll breakage easily; Be that this invention technology member rate in implementation process is low on the other hand, thereby strengthened the manufacturing cost of roll, reduced the competitiveness of product in market.
Summary of the invention
The object of the invention is to provide a kind of cast steel back-up roller and preparation method thereof, makes that composition is reasonable in design, manufacturing process is ripe, and roll strength height, good toughness, anti-accident ability are strong, a kind of novel cast steel back-up roller of long service life.
Back up roll working layer of the present invention adopts high-alloy steel, and the core of the roll material adopts graphitic steel; Roll working lining high-alloy steel and core of the roll graphitic steel are complete metallurgical binding.
The chemical component weight percentage of described high-alloy steel is: C 0.4-0.6%, Si 0.4-0.6%, Mn 0.5-0.7%, Cr 4.5-5.5%, Ni 1.0-1.2%, Mo 0.6-0.8%, Re 0.03-0.08%, P≤0.035%, S≤0.030%, surplus is Fe.
The chemical component weight percentage of described graphitic steel is: C 1.4-1.6%, and Si 1.7-1.9%, Mn 0.4-0.6%, Ni 0.5-0.7%, Cr＜0.2%, Mo＜0.2%, P＜0.035%, S＜0.030%, surplus is Fe.
The technical solution adopted in the present invention is:
1, cast steel back-up roller manufacture method of the present invention is to adopt the existing horizontal type centrifugal-casting process of generally using that two kinds of different metal materials are fused into one, at first press the roll working lining, the concrete composition of core requires to smelt respectively, when reaching, the high-alloy steel water chemistry composition that is used as the roll working lining and temperature set tapping when requiring, and adopt the rare earth processing of going bad, molten steel after rotten the processing is poured in the centrifuge casting mold of rotation at a high speed, the cast temperature of molten steel is 1500-1550 ℃, the temperature of casting mold is 100-200 ℃ during casting, paint thickness is 2-5mm in the casting mold, and the linear velocity of centrifuge speed is the 10-15 meter per second.Roll working lining high alloy molten steel is a crystallization and freezing under centrifugal action, and density height, wearability are good.When just having solidified, the molten steel of roll working lining shuts down rapidly; the working lining that solidified is sling with after last drag box cooperates from centrifuge together with casting mold; pour into the graphitic steel molten steel that is used as core of the roll again; the cast temperature of core graphitic steel molten steel is 1470-1520 ℃, thereby makes two kinds of high molten metals of solid-state temperature reach complete metallurgical melting by horizontal type centrifugal-casting.
2, if the back up roll core material is to adopt high-strength alloy spheroidal graphite cast-iron, because C content is that the solidus temperature of 0.4-0.6% back up roll working lining high alloy molten steel is that the solidus temperature of 3.0-3.6% back up roll core high-strength alloy molten ductile cast iron is high about 300 ℃ than C content, metallurgical binding in order to ensure these two kinds of materials, when cast back up roll core high-strength alloy molten ductile cast iron, must sufficiently improve the tapping temperature and the pouring temperature of core molten iron, patent application: requirement in 2,009 1 0001054.9, the tapping temperature of core molten iron is 1615 ± 5 ℃, and the pouring temperature of core molten iron is 1495 ± 5 ℃.For spheroidal graphite cast-iron, high tapping temperature and pouring temperature like this, one side will have a strong impact on the nodularization effect of molten ductile cast iron, cause core of the roll intensity to reduce, usually because core of the roll tensile strength can not reach 500N/mm
2And scrap; This two kinds of metals that solidus temperature differs greatly on the other hand; because shutdown, handling, these a series of long-time manually-operated processes of mould assembling; be difficult to reach metallurgical binding completely; two kinds of materials often occur in conjunction with bad and scrap, further reduced the member rate of roll in manufacture process, improved the manufacturing cost of roll.The weak point of patent application that Here it is 2,009 1 0001054.9.
3, at first carry out roughing for the blank back up roll behind the cooling forming, quench and tempering heat treatment after finishing.Hardening heat is to rise to 630-660 ℃ of insulation after 3-6 hour with 10-20 ℃/hour programming rate, programming rate is promoted to be 20-30 ℃/hour again, roll is heated to 900-950 ℃ of insulation comes out of the stove after 8-16 hour.Quenching is to adopt the fast cooling type of cooling, and cooling rate is 10-20 ℃/minute, carries out temper after being cooled to 200-400 ℃ again, and temperature is 500-550 ℃, and tempering insulation time is to cool off with stove after 5-10 hour.
The chemical composition design considerations of cast steel back-up roller working layer of the present invention is as follows:
C is a component important in the steel, and it improves the intensity of steel with solid solution and the mode that forms carbide, and when the C too high levels, the primary austenite amount is few, and the carbide amount increases, and roll toughness reduces; Cross when low when C content, primary austenite broadens between the vitellarium, and crystal grain is thick, and the roll wearability reduces.Therefore it is more suitable C content to be controlled at 0.4-0.6%.
The common solid solution of Si is among matrix, higher Si helps postponing the generation of Low-Temperature Temper Brittleness, and play the solution strengthening effect, when the Si too high levels, austenite region is dwindled, and eutectic and eutectoid reaction temperature improve, and are easy to form ferrite, reduced the serviceability of roll, it is more suitable usually Si content to be controlled at 0.4-0.6%.
Mn is the same with Ni all to be the matrix of refinement steel, the intensity that improves steel and the effective element of toughness, Ni helps improving the mechanical property of steel, increase the quenching degree of steel, Mn hinders the element that graphitization promotes that carbide forms, when too high levels, the increase of remained austenite content in can causing again organizing, retained austenite is disadvantageous in the heat treatment of roll and use.Therefore Mn content is controlled at 0.6-0.7% in the composition design, and it is more suitable that Ni content is controlled at 1.0-1.2%.
Cr is strong carbide former, is to improve one of effective elements of roll wearability, will form the Cr of some in the increase roll tissue along with Cr content
7C
3The type carbide, Cr
7C
3The microhardness of type carbide can reach 1600-1800HV, and wearability is good, and Cr
7C
3Type carbide heat endurance is higher than Fe
3C type carbide.Cr can improve the quenching degree of steel again, improves the anti-contact fatigue property of back up roll, and it can also improve the non-oxidizability of steel simultaneously, and it is more suitable therefore Cr content to be controlled at 4.5-5.5%.
Mo can stop carbide to be separated out along crystal boundary, helps crystal grain thinning, improves the toughness of steel, can also improve temper resistance simultaneously, suppresses temper brittleness.But Mo can reduce the thermal conductivity of steel again, and when the Mo too high levels, the poor thermal conductivity of steel causes the roll thermal stress to increase, and thermal fatigue resistance descends, and it is more suitable therefore Mo content to be controlled at 0.6-0.8%.
The Re element is common element as reduction or elimination impurity in steel, in composite roller operational layer steel alloy composition of the present invention, Re purifies crystal boundary in addition and eliminates the effect of crackle, but must limit the addition of Re element, so in the roll working lining steel alloy composition, the addition of control Re is Re 0.03-0.08%.
Simultaneously, in order to obtain the combination property of good obdurability, must strictly control impurity content, its P content is no more than 0.035%, and S content is no more than 0.030%.
The chemical composition design considerations of cast steel back-up roller core material of the present invention is as follows:
What cast steel back-up roller core material of the present invention adopted is graphitic steel, it is exactly the tensile strength height that main performance index requires, roll breakage not in use, C and Si are typical graphite elements, in graphitizing, interdepend, coexist mutually, require to have sufficiently high content, therefore, C is controlled at 1.4-1.6%, and Si is controlled at 1.7-1.9%; Cr and Mo are carbide formers, so Cr will be strict controlled in below 0.2%, and Mo also will be strict controlled in below 0.2%; Ni is the matrix of refinement steel, the intensity that improves steel and the effective element of toughness, so kept the adding of 0.5-0.7%Ni in the core of the roll graphitic steel; P, S are as harmful impurity element, and be low more good more, and P content is no more than 0.035% usually, and S content is no more than 0.030%.
The innovative point of the technology of the present invention is to adopt the horizontal type centrifugal-casting technology that C content is fused together less than 0.6% roll working lining alloy steel material and core of the roll graphitic steel material, broken through the two kinds high solid-state temperature molten metals of in the past not accomplishing and reached metallurgical completely compound by the horizontal type centrifugal-casting technology, this has never seen report (technology in Europe is to adopt the vertical centrifugal combination process, and the technology of China Xing machine is to adopt the static casting combination process) in roll manufacturing technology in the past.
Cast steel back-up roller of the present invention also possesses following advantage compared with prior art:
1, the cast steel back-up roller that adopts the technology of the present invention to make, because the roll working layer adopts high-alloy steel, roll working lining wearability and good toughness, strong, the long service life of anti-accident ability;
2, because the core of the roll material adopts graphitic steel, the tensile strength of core of the roll is by high-strength alloy spheroidal graphite cast-iron 400-550N/mm
2Bring up to graphitic steel 600-750N/mm
2, core of the roll intensity height, break resistance are good, improve online service time of roll and operating rate of rolling mill greatly;
3, because the core of the roll material adopts graphitic steel, avoided molten ductile cast iron owing to high temperature taps a blast furnace, high temperature cast usually causes the roll abnormal nodularizing and in conjunction with bad serious consequence of scrapping, thereby reduced the roll manufacturing cost, increased the profit margin and the market competitiveness of product.
Description of drawings
Fig. 1 is the cast steel back-up roller structural representation.
The specific embodiment
By a kind of novel cast steel back-up roller of the present invention, the working layer of roll adopts high-alloy steel, and the core material of roll adopts graphitic steel.We have successively produced the cast steel back-up roller of 4 batches of embodiment of the invention altogether, and 4 batches amount to 8 rolls all be qualified products and mail to user's use.The chemical composition of these 4 batches of cast steel back-up roller working linings and core molten steel is all listed in the table 1.We are before this by existing patent application technology before this: 2 rolls have been produced in 2,009 1 0001054.9 requirement, these 2 rolls are all scrapped owing to core tensile strength is low, contrast is also listed the working lining molten steel of these 2 composite rolls and the chemical composition of core molten iron in the table 1 in for convenience.The chemical composition of also having listed present employing cast-in-block alloy half steel back up roll simultaneously in the table 1 in as a comparison case.
The mechanical property of embodiment of the invention roll and prior art roll and operating position comparing result are listed table 2 in.By the production of above-mentioned back up roll with use the result as can be seen, adopt cast steel back-up roller mechanical property that the technology of the present invention produces apparently higher than prior art products, roll can improve 2.5-4 doubly service life.
In embodiment of the invention contrast table 1 and table 2, I, II, III, IV are embodiment of the invention material, and A, B, C are the Comparative Examples material.
The contrast of each composition weight % of the back up roll of table 1 embodiment of the invention and prior art
The mechanical property of table 2 embodiment of the invention and prior art and use result's contrast
Claims (3)
1. a cast steel back-up roller is characterized in that, the back up roll working layer adopts high-alloy steel, and the core of the roll material adopts graphitic steel; Roll working lining high-alloy steel and core of the roll graphitic steel are complete metallurgical binding;
The chemical component weight percentage of described high-alloy steel is: C 0.4-0.6%, Si 0.4-0.6%, Mn0.5-0.7%, Cr 4.5-5.5%, Ni 1.0-1.2%, Mo 0.6-0.8%, Re 0.03-0.08%, P≤0.035%, S≤0.030%, surplus is Fe;
The chemical component weight percentage of described graphitic steel is: C 1.4-1.6%, and Si 1.7-1.9%, Mn 0.4-0.6%, Ni 0.5-0.7%, Cr＜0.2%, Mo＜0.2%, P＜0.035%, S＜0.030%, surplus is Fe.
2. method for preparing the described cast steel back-up roller of claim 1, it is characterized in that, adopt horizontal type centrifugal-casting technology that two kinds of different metal materials are fused into one, at first press the roll working lining, the concrete composition of core requires to smelt respectively, when reaching, the high-alloy steel water chemistry composition that is used as the back up roll working lining and temperature set tapping when requiring, and adopt the rare earth processing of going bad, molten steel after rotten the processing is poured in the centrifuge casting mold of rotation at a high speed, the cast temperature of molten steel is 1500-1550 ℃, the temperature of casting mold is 100-200 ℃ during casting, paint thickness is 2-5mm in the casting mold, and the linear velocity of centrifuge speed is the 10-15 meter per second; Before the molten steel ot-yet-hardened of back up roll working lining, the working lining inner surface is carried out protective treatment; when just having solidified, the molten steel of working lining shuts down; the working lining that solidified is sling with after last drag box cooperates from centrifuge together with casting mold; pour into the graphitic steel molten steel that is used as the back up roll core again; the cast temperature of back up roll core graphitic steel molten steel is 1470-1520 ℃, thereby makes two kinds of high molten metals of solid-state temperature reach complete metallurgical melting by horizontal type centrifugal-casting.
3. method according to claim 2 is at first carried out roughing for the blank back up roll behind the cooling forming, quenches and tempering heat treatment after finishing; Hardening heat is to rise to 630-660 ℃ of insulation after 3-6 hour with 10-20 ℃/hour programming rate, programming rate is promoted to be 20-30 ℃/hour again, back up roll is heated to 900-950 ℃ of insulation comes out of the stove after 8-16 hour; Quenching is to adopt the fast cooling type of cooling, and cooling rate is 10-20 ℃/minute, carries out temper after being cooled to 200-400 ℃ again, and temperature is 500-550 ℃, and tempering insulation time is to cool off with stove after 5-10 hour.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102361535A CN101695714B (en) | 2009-10-28 | 2009-10-28 | Cast steel back-up roller and preparation method thereof |
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| CN2009102361535A CN101695714B (en) | 2009-10-28 | 2009-10-28 | Cast steel back-up roller and preparation method thereof |
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| CN101695714A CN101695714A (en) | 2010-04-21 |
| CN101695714B true CN101695714B (en) | 2011-06-22 |
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Patent Citations (4)
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| CN1179368A (en) * | 1997-02-24 | 1998-04-22 | 冶金工业部钢铁研究总院 | Centrifugal casting method for producing composite high-speed steel rollers |
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