CN102615106B - Boron-contained centrifugal composite high-speed steel roller and manufacturing method thereof - Google Patents
Boron-contained centrifugal composite high-speed steel roller and manufacturing method thereof Download PDFInfo
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- CN102615106B CN102615106B CN201210096764.6A CN201210096764A CN102615106B CN 102615106 B CN102615106 B CN 102615106B CN 201210096764 A CN201210096764 A CN 201210096764A CN 102615106 B CN102615106 B CN 102615106B
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Abstract
The invention discloses a boron-contained centrifugal composite high-speed steel roller, which comprises an outer layer of the high-speed steel roller, a middle layer of the high-speed steel roller and a core of the high-speed steel roller. The manufacturing method includes steps of smelting, interrupted front treatment, roller pouring, annealing, rough machining, double tempering, finish machining and testing. By the method, three-layer composite roller technology is adopted in the boron-contained centrifugal composite high-speed steel roller, composite ability of the outer layer of the high-speed steel roller and the core of the high-speed steel roller is increased, the roller is less prone to spalling, high in rigidity and accident resistant ability, fine in abrasion resistance, safe in use, low in energy consumption and short in cycle in heat treatment, oxidation and decarburization of the roller and roller breakage in use are avoided. The manufacturing method is simple and hot quenching process is omitted.
Description
Technical field
The present invention relates to composite roller for rolling steel technical field, particularly a kind of boracic centrifugal compound high-speed steel roll and preparation method.
Background technology
Along with developing rapidly of metallurgical industry, the current stocking annual production of China has approached 6.7 hundred million tons, accounts for 50% left and right of world's stocking total amount, and modern rolling technique generally adopts, is the advanced rolling techniques such as zerolling and continuous rolling without a head.Roll is a large amount of critical components that consume during steel rolling is produced, therefore the properties of breaker roll and having proposed service life with high requirement, composite high-speed steel roller is high with its hardness, wearability good and good result of use is generally adopted and praises highly by vast steel rolling circle.
High-speed steel roll is neoteric a kind of new roller in recent years, and its sphere of action is not only applicable to the cold Heat Working Rolls of strip-mill strip, but also is applicable to the working roll of various wire and bar mills, has prospect of the application widely.But, in existing production technology, what skin of the roll adopted is high-speed steel, and core of the roll employing is spheroidal graphite cast-iron, although this kind of compound high speed steel roll well applied at present in steel rolling is produced, because core of the roll spheroidal graphite cast-iron intensity is lower, make roll all have certain deficiency in production and use procedure, skin of the roll and core of the roll compound ability are not strong, during steel rolling, easily peel off.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide a kind of boracic centrifugal compound high-speed steel roll, increased the compound ability of high-speed steel roll skin and high-speed steel roll core, incrust during steel rolling, hardness intensity is high, wearability good and anti-accident ability is strong.
In order to address the above problem, technical scheme of the present invention is, a kind of boracic centrifugal compound high-speed steel roll is provided, comprise high-speed steel roll skin, high-speed steel roll intermediate layer and high-speed steel roll core, the outer field chemical component weight percentage of described high-speed steel roll is: C:0.8-0.9%, Si:1.0-1.2%, Mn:0.9-1.2%, P :≤0.03%, S :≤0.03%, Ni: 0.9-1.0%, Cr:5-6%, Mo:1.4-1.5%, B:1.9-2.2%, V:1.4-1.6%, W:2-3%, Nb: 0.4-0.5% and rare earth; The chemical component weight percentage in described high-speed steel roll intermediate layer is: C:1.7-1.8%, Si:1.4-1.6%, Mn:0.9-1.0%, P :≤0.03%, S :≤0.03%, Ni:0.8-1.2%, Cr:1.3-1.5% and Mo:0.3-0.5%; The chemical component weight percentage of described high-speed steel roll core is: C:3.1-3.3%, Si:1.8-2.0%, Mn:0.6-0.7%, P :≤0.1%, S :≤0.03%, Ni :≤0.3%, Cr:0.2-0.3%, Mo:0.2-0.3% and Mg:0.05-0.08%.
In a preferred embodiment of the present invention, described high-speed steel roll skin is boracic high-speed steel, and high-speed steel roll intermediate layer is graphitic steel, and high-speed steel roll core is spheroidal graphite cast-iron.
In a preferred embodiment of the present invention, the content of the described outer middle rare earth of high-speed steel roll is 0.4%.
In a preferred embodiment of the present invention, described high-speed steel roll intermediate layer also adds the inovulant of 0.1%CaSiMn and 0.5% yttrium-base heavy rare earth.
In a preferred embodiment of the present invention, described high-speed steel roll skin and the metallographic structure of high-speed steel roll intermediate layer are austenite+martensite.
For solving the problems of the technologies described above, another technical solution used in the present invention is: a kind of preparation method of boracic centrifugal compound high-speed steel roll is provided, has comprised the following steps:
A, melting: by steel scrap, the pig iron or carburant, flatiron, ferrotungsten, molybdenum-iron and nickel plate, Hybrid Heating fusing, molten steel adds ferromanganese and ferrosilicon pre-deoxidation after melting clearly, temperature is risen to 1500-1540 ℃, add successively vanadium iron, ferro-boron, ferro-niobium and heat up, when liquid steel temperature reaches 1550-1580 ℃, add aluminium deoxidation, then come out of the stove;
B, stokehold process: yttrium-base heavy rare earth, after 180-220 ℃ of oven dry, is placed in to ladle bottom, with pouring method in wrapping, molten steel is carried out to RE Modified processing, obtain boracic high-speed steel liquid, after skimming for pouring into a mould skin of the roll;
C, roll cast: adopt coated sand as cast coating, outer pouring molten steel temperature is 1560 ± 10 ℃, spreads glass dregs 2.5kg, when outer liquid steel temperature is poured into a mould intermediate layer molten steel during at 1230 ℃, then spreads glass dregs 1.5kg; When intermediate layer molten steel solidification temperature is shut down mould assembling cast core molten iron during at 1180 ℃;
D, annealing: add heat preserving agent to be incubated to unpack after 8-12h air cooling;
E, roughing: carry out Surface Machining processing, reserved allowance 2-3mm;
F, double tempering: the heating furnace being placed in lower than 200 ℃ is incubated 1-3h, then with the programming rate of 15-25 ℃/h, be heated to 510-560 ℃ and be incubated processing, the insulation air cooling of coming out of the stove after 5h, be as cold as 250 ℃, again roll is placed in again to temperature and is incubated 1-2h lower than the heating furnace of 300 ℃, then with the programming rate of 25-40 ℃/h, be heated to 480-510 ℃ and be incubated 6h, then stove be chilled to temperature lower than air cooling after 180 ℃ to room temperature;
G, fine finishining: the size of fine finishining roll;
H, check: carry out conventional check.
In a preferred embodiment of the present invention, in the treatment step of described stokehold, yttrium-base heavy rare earth is crushed to the fritter that granularity is 8-20mm.
In a preferred embodiment of the present invention, in described roll cast step, glass dregs is NB type or YK-107 type glass dregs.
In a preferred embodiment of the present invention, in described roll cast step, the monolateral thickness of coated sand is
2-3mm, coated sand weight is 4kg.
Boracic centrifugal compound high-speed steel roll of the present invention, three layers of composite roll technology have been adopted, comprise high-speed steel roll skin, high-speed steel roll intermediate layer and high-speed steel roll core, increased the compound ability of high-speed steel roll skin and high-speed steel roll core, incrust, hardness intensity is high, wearability good, anti-accident ability is strong.
Accompanying drawing explanation
Fig. 1 is the flow chart of preparation method's one preferred embodiment of boracic centrifugal compound high-speed steel roll of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention is made to more explicit defining.
A kind of boracic centrifugal compound high-speed steel roll provided by the invention, comprises high-speed steel roll skin, high-speed steel roll intermediate layer and high-speed steel roll core.The outer field chemical component weight percentage of high-speed steel roll in the present invention is: C:0.8-0.9%, Si:1.0-1.2%, Mn:0.9-1.2%, P :≤0.03%, S :≤0.03%, Ni:0.9-1.0%, Cr:5-6%, Mo:1.4-1.5%, B:1.9-2.2%, V:1.4-1.6%, W:2-3%, Nb:0.4-0.5% and rare earth; The chemical component weight percentage in described high-speed steel roll intermediate layer is: C:1.7-1.8%, Si:1.4-1.6%, Mn:0.9-1.0%, P :≤0.03%, S :≤0.03%, Ni:0.8-1.2%, Cr:1.3-1.5% and Mo:0.3-0.5%; The chemical component weight percentage of described high-speed steel roll core is: C:3.1-3.3%, Si:1.8-2.0%, Mn:0.6-0.7%, P :≤0.1%, S :≤0.03%, Ni :≤0.3%, Cr:0.2-0.3%, Mo:0.2-0.3% and Mg:0.05-0.08%.
In above-mentioned, the content of the outer middle rare earth of high-speed steel roll is 0.4%.High-speed steel roll intermediate layer also adds
The inovulant of 0.1%CaSiMn and 0.5% yttrium-base heavy rare earth.
High-speed steel roll skin in the present invention is boracic high-speed steel, and high-speed steel roll intermediate layer is graphitic steel, and high-speed steel roll core is spheroidal graphite cast-iron.High-speed steel roll hardness outer and high-speed steel roll intermediate layer is HRC56-62, high-speed steel roll core HSD38-45.High-speed steel roll skin and the metallographic structure of high-speed steel roll intermediate layer are austenite+martensite.
As shown in Fig. 1, it is the flow chart of preparation method's one preferred embodiment of boracic centrifugal compound high-speed steel roll of the present invention.The preparation method of this boracic centrifugal compound high-speed steel roll, comprises the following steps:
A, melting: by steel scrap, the pig iron or carburant, flatiron, ferrotungsten, molybdenum-iron and nickel plate, Hybrid Heating fusing, molten steel adds ferromanganese and ferrosilicon pre-deoxidation after melting clearly, temperature is risen to 1500-1540 ℃, add successively vanadium iron, ferro-boron, ferro-niobium and heat up, when liquid steel temperature reaches 1550-1580 ℃, add aluminium deoxidation, then come out of the stove;
B, stokehold process: yttrium-base heavy rare earth, after 180-220 ℃ of oven dry, is placed in to ladle bottom, with pouring method in wrapping, molten steel is carried out to RE Modified processing, obtain boracic high-speed steel liquid, after skimming for pouring into a mould skin of the roll;
C, roll cast: adopt coated sand as cast coating, outer pouring molten steel temperature is 1560 ± 10 ℃, spreads glass dregs 2.5kg, when outer liquid steel temperature is poured into a mould intermediate layer molten steel during at 1230 ℃, then spreads glass dregs 1.5kg; When intermediate layer molten steel solidification temperature is shut down mould assembling cast core molten iron during at 1180 ℃;
D, annealing: add heat preserving agent to be incubated to unpack after 8-12h air cooling;
E, roughing: carry out Surface Machining processing, reserved allowance 2-3mm;
F, double tempering: the heating furnace being placed in lower than 200 ℃ is incubated 1-3h, then with the programming rate of 15-25 ℃/h, be heated to 510-560 ℃ and be incubated processing, the insulation air cooling of coming out of the stove after 5h, be as cold as 250 ℃, again roll is placed in again to temperature and is incubated 1-2h lower than the heating furnace of 300 ℃, then with the programming rate of 25-40 ℃/h, be heated to 480-510 ℃ and be incubated 6h, then stove be chilled to temperature lower than air cooling after 180 ℃ to room temperature;
G, fine finishining: the size of fine finishining roll;
H, check: carry out conventional check.
In above-mentioned, in the treatment step of stokehold, yttrium-base heavy rare earth is crushed to the fritter that granularity is 8-20mm, adopts yttrium-base heavy rare earth to carry out stokehold processing, material structure is fine and closely woven, has realized cocrystalization compound online disperse shape and has distributed, and has reduced structural stress.
In above-mentioned, in roll cast step, glass dregs is NB type or YK-107 type glass dregs; The monolateral thickness of coated sand is 2-3mm, and coated sand weight is 4kg.The present invention adopts coated sand as mold wash, has hang to be coated with conveniently, and the demoulding is easy, and clean-up intensity is low, once hangs and is coated with, and does not need post bake to dry, the feature of efficient, low energy and mixed bag.
In the present invention, the Technology for Heating Processing of conventional boracic centrifugal compound high-speed steel roll is improved, by conventional quenching, added temper and change double tempering into and blow, cancelled the quench hot of roll, the one, can save the energy; The 2nd, the oxidation on surface and decarburization in the time of can eliminating high-temperature heating; The 3rd, in the time of can eliminating roll high-temperature heating, high-speed steel roll core intensity declines.In order to cancel the quench hot of boracic centrifugal compound high-speed steel roll, in cast iron roll in as-cast tissue, should there is not pearlite, as cast condition matrix is that austenite and martensite are main.
Boracic centrifugal compound high-speed steel roll of the present invention, three layers of composite roll technology have been adopted, comprise high-speed steel roll skin, high-speed steel roll intermediate layer and high-speed steel roll core, increased the compound ability of high-speed steel roll skin and high-speed steel roll core, incrust, hardness intensity is high, wearability good, anti-accident ability is strong.The preparation method of this boracic centrifugal compound high-speed steel roll, has saved quench hot technique, and roll heat treatment energy consumption is low, the cycle is short, and roll there will not be oxidation and decarburization, and high-speed steel roll core intensity and as cast condition can not decline; Production boracic centrifugal compound high-speed steel roll has the effect of good use, reaches the 2-3 of high Minvar roll service life doubly, and roll use safety, in use, without roll breakage phenomenon, occurs.
The above; it is only the specific embodiment of the present invention; but protection scope of the present invention is not limited to this; any those of ordinary skill in the art are in the disclosed technical scope of the present invention; the variation that can expect without creative work or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims were limited.
Claims (9)
1. a boracic centrifugal compound high-speed steel roll, comprise high-speed steel roll skin, high-speed steel roll intermediate layer and high-speed steel roll core, it is characterized in that, the outer field chemical component weight percentage of described high-speed steel roll is: C:0.8-0.9%, Si:1.0-1.2%, Mn:0.9-1.2%, P :≤0.03%, S :≤0.03%, Ni:0.9-1.0%, Cr:5-6%, Mo:1.4-1.5%, B:1.9-2.2%, V:1.4-1.6%, W:2-3%, Nb:0.4-0.5% and rare earth; The chemical component weight percentage in described high-speed steel roll intermediate layer is: C:1.7-1.8%, Si:1.4-1.6%, Mn:0.9-1.0%, P :≤0.03%, S :≤0.03%, Ni:0.8-1.2%, Cr:1.3-1.5% and Mo:0.3-0.5%; The chemical component weight percentage of described high-speed steel roll core is: C:3.1-3.3%, Si:1.8-2.0%, Mn:0.6-0.7%, P :≤0.1%, S :≤0.03%, Ni :≤0.3%, Cr:0.2-0.3%, Mo:0.2-0.3% and Mg:0.05-0.08%.
2. according to the boracic centrifugal compound high-speed steel roll described in claim 1, it is characterized in that, described high-speed steel roll skin is boracic high-speed steel, and high-speed steel roll intermediate layer is graphitic steel, and high-speed steel roll core is spheroidal graphite cast-iron.
3. boracic centrifugal compound high-speed steel roll according to claim 1, is characterized in that, the content of the described outer middle rare earth of high-speed steel roll is 0.4%.
4. boracic centrifugal compound high-speed steel roll according to claim 1, is characterized in that, described high-speed steel roll intermediate layer also adds the inovulant of 0.1%CaSiMn and 0.5% yttrium-base heavy rare earth.
5. according to the boracic centrifugal compound high-speed steel roll described in claim 1, it is characterized in that, described high-speed steel roll skin and the metallographic structure of high-speed steel roll intermediate layer are austenite+martensite.
6. the preparation method of boracic centrifugal compound high-speed steel roll according to claim 1, is characterized in that, comprises the following steps:
A, melting: by steel scrap, the pig iron or carburant, flatiron, ferrotungsten, molybdenum-iron and nickel plate, Hybrid Heating fusing, molten steel adds ferromanganese and ferrosilicon pre-deoxidation after melting clearly, temperature is risen to 1500-1540 ℃, add successively vanadium iron, ferro-boron, ferro-niobium and heat up, when liquid steel temperature reaches 1550-1580 ℃, add aluminium deoxidation, then come out of the stove;
B, stokehold process: yttrium-base heavy rare earth, after 180-220 ℃ of oven dry, is placed in to ladle bottom, with pouring method in wrapping, molten steel is carried out to RE Modified processing, obtain boracic high-speed steel liquid, after skimming for pouring into a mould skin of the roll;
The cast of c, roll: by boracic high-speed steel liquid castable in centrifuge casting mold, adopt coated sand as mold wash, outer pouring molten steel temperature is 1560 ± 10 ℃, spreads glass dregs 2.5kg, when outer liquid steel temperature is poured into a mould intermediate layer molten steel during at 1230 ℃, then spread glass dregs 1.5kg; When intermediate layer molten steel solidification temperature is shut down mould assembling cast core molten iron during at 1180 ℃;
D, annealing: add heat preserving agent to be incubated to unpack after 8-12h air cooling;
E, roughing: carry out Surface Machining processing, reserved allowance 2-3mm;
F, double tempering: the heating furnace being placed in lower than 200 ℃ is incubated 1-3h, then with the programming rate of 15-25 ℃/h, be heated to 510-560 ℃ and be incubated processing, the insulation air cooling of coming out of the stove after 5h, be as cold as 250 ℃, again roll is placed in again to temperature and is incubated 1-2h lower than the heating furnace of 300 ℃, then with the programming rate of 25-40 ℃/h, be heated to 480-510 ℃ and be incubated 6h, then stove be chilled to temperature lower than air cooling after 180 ℃ to room temperature;
G, fine finishining: the size of fine finishining roll;
H, check: carry out conventional check.
7. the preparation method of boracic centrifugal compound high-speed steel roll according to claim 6, is characterized in that, in the treatment step of described stokehold, yttrium-base heavy rare earth is crushed to the fritter that granularity is 8-20mm.
8. the preparation method of boracic centrifugal compound high-speed steel roll according to claim 6, is characterized in that, in described roll cast step, glass dregs is NB type or YK-107 type glass dregs.
9. the preparation method of boracic centrifugal compound high-speed steel roll according to claim 6, is characterized in that, in described roll cast step, the monolateral thickness of coated sand is 2-3mm, and coated sand weight is 4kg.
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| JP3268238B2 (en) * | 1997-07-24 | 2002-03-25 | 株式会社クボタ | Graphite crystallized high-speed cast iron material with excellent skin roughness resistance |
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