CN103624084B - Resource-saving type high-boron high-speed steel composite roll and manufacturing method thereof - Google Patents

Resource-saving type high-boron high-speed steel composite roll and manufacturing method thereof Download PDF

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CN103624084B
CN103624084B CN201310585985.4A CN201310585985A CN103624084B CN 103624084 B CN103624084 B CN 103624084B CN 201310585985 A CN201310585985 A CN 201310585985A CN 103624084 B CN103624084 B CN 103624084B
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steel
boron
roll
roller
surplus
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CN201310585985.4A
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CN103624084A (en
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徐继亮
符寒光
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枣庄瑞兴机械制造有限公司
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Abstract

The invention discloses a resource-saving type high-boron high-speed steel composite roll and a manufacturing method of the resource-saving type high-boron high-speed steel composite roll, and belongs to the technical field of rolls. The composite roll is composed of outer-layer high-boron high-speed steel, middle transition-layer graphitic steel and roll core hot rolling medium-carbon round steel, the outer-layer high-boron high-speed steel and the middle transition-layer graphitic steel are formed in a centrifugal combination mode, and the transition-layer graphitic steel and the roll core hot rolling medium-carbon round steel are formed in a hot charging combination mode. The composite roll is high in roll face rigidity and good in rigidity uniformity, and it is guaranteed that the composite roll is excellent in abrasive resistance. A roll core is formed by machining the hot rolling medium-carbon round steel and is good in obdurability, the roll breakage accident cannot happen in the roll using process, and good economic benefits and social benefits are achieved through popularization and application.

Description

A kind of resource-conserving high-boron high-speed steel composite roller and preparation method thereof
Technical field
The present invention relates to a kind of high-speed steel roll and preparation method thereof, particularly a kind of resource-conserving high-boron high-speed steel composite roller and preparation method thereof, belongs to roll technology field.
Background technology
Roll is consumable part important in Rolling production, the Performance and quality of roll directly determines the production cost of stocking, stocking surface quality and operating rate of rolling mill, improve roller performance, reduce the research of roll manufacturing cost, constantly cause the attention of domestic and international roll producer and researcher.In order to improve roller performance, Chinese invention patent CN103031496A discloses a kind of cast steel roll, comprises alloy outer and core, the chemical component weight percentage of described alloy outer is: C1.50 ?2.20%, Si≤0.060%, Mn0.40 ?1.20%, P≤0.030%, S≤0.025%, Cr3.00 ?8.00%, Ni0.00 ?1.50%, Mo2.00 ?8.00%, V2.00 ?9.00%, W0.00 ?3.00%, Nb0.00 ?0.85%, Al0.00 ?1.20%, surplus is Fe; The chemical component weight percentage of described core is: C2.8 ?3.4%, Si1.8 ?2.6%, Mn0.3 ?0.6%, P≤0.08%, S≤0.03%, Mg0.04 ?0.06%.This invention adopts alloy outer and the core of mentioned component, its wearability and good, the anti-accident ability of obdurability are strong, long service life, avoid rolling accident, alloy outer and core energy fully metallurgical binding, reduce the element proportional quantity that in use adverse effect is larger simultaneously, reduce production cost, improve service condition simultaneously.Chinese invention patent CN103014532A also discloses a kind of High-abrasion-resistcomposite composite roller and preparation method thereof, roll working layer adopts the tungsten carbide reinforced alloys half steel that wearability is good, have high hard phase, core of the roll adopts graphitic steel, and roll working lining tungsten carbide reinforced alloys semi-steel material and core of the roll graphitic steel material are complete metallurgical binding.The chemical component weight percentage of described roll working lining tungsten carbide reinforced alloys semi-steel material is: C1.2 ?2.1%, Si0.3 ?1.0%, Mn0.5 ?1.2%, Cr0.5 ?3.5%, Ni1.0 ?4.5%, Mo0.3 ?1.0%, P≤0.035%, S≤0.030%, WC0.1 ?5.0%, surplus is Fe; The chemical component weight percentage of described core of the roll graphitic steel material is: C1.4 ?1.8%, Si1.4 ?2.0%, Mn0.3 ?0.8%, Ni0.3 ?0.8%, Cr0.01 ?0.3%, Mo0.01 ?0.3%, P < 0.035%, S < 0.030%, surplus is Fe.Advantage is, good, the anti-accident ability of roll wearability is strong, improve roll online service life and operating rate of rolling mill.Chinese invention patent CN103009015A also discloses the manufacture method of bimetal composite wear resistant metallurgical roller, comprise roller core procedure of processing, preheating step, built-up welding composite bed step, finishing step and heat treatment step, wherein: roller core procedure of processing is first pass through forging and stamping and modifier treatment with the steel that tensile strength, yield strength and shock resistance are excellent, make roller core blank, then by extremely reserved for the roughing of roller core blank built-up welding composite bed size; Preheating step is by the suitable weldering temperature of Preheating Core to 380 DEG C ± 5 DEG C.Built-up welding composite bed step is filled up by reserved built-up welding composite bed medication core welding wire built-up welding by the roller core surface submerged welding process after preheating; Finishing step is that the bimetal composite wear resistant metallurgical roller blank of heap postwelding is machined to design size; Heat treatment step is carried out quenching and modifier treatment by the bimetal composite wear resistant metallurgical roller after fine finishining, the antisticking wearing and tearing its top layer being reached possessed, the requirement of anti-abrasive wear, red hardness, thermal fatigue resistance and resistance to flaking.Chinese invention patent CN103074539A also discloses a kind of centrifugal compound nickelic niobium wear resistant cast iron roll and casting method thereof, comprise working lining and sandwich layer, it is characterized in that, its working lining chemical composition composition is by weight percentage: C2.9 ~ 3.6%, Si0.6 ~ 1.5%, Mn0.4 ~ 1.2%, P < 0.10%, S < 0.05%, Ni3.01 ~ 4.8%, Cr1.0 ~ 2.0%, Mo0.2 ~ 2.0%, Nb0.1 ~ 2.0%, V1.0 ~ 4.0%, W0.05 ~ 2.0%, all the other are Fe.Compared with prior art, this beneficial effect of the invention is: block abrasion-proof particle is point, block Dispersed precipitate be embedded in roll metallic matrix; Graphite exists with punctate appearance.Abrasion-proof particle Dispersed precipitate, inlays in the base firmly difficult drop-off, greatly facilitates the overall wear resistance energy of roller substrate tissue; The overall roll surface wearing of roll is even.Chinese invention patent CN103014516A also discloses a kind of boracic low-alloy high-speed steel rolls and manufacture method thereof.Described roll comprises the body of roll and roller core two parts composition, and the chemical composition of the body of roll calculates according to percentage by weight and is: C:0.7 ~ 0.8, Cr:1.3 ~ 2.4, B:2.50 ~ 3.0, W:1.0 ~ 1.5, V:1.0 ~ 1.5, Si :≤1.0, Mn :≤0.4, Ti:0.09 ~ 0.12, Mg:0.16 ~ 0.19, RE:0.10 ~ 0.12, P :≤0.03, S≤0.03, surplus is Fe and inevitable trace impurity, and roller core is spheroidal graphite cast-iron.The manufacture method of the described roll of this invention for adopting centrifugal casting after molten refining ?deoxidation alloying ?rare earth magnesium compound modification treatment, is more after heat treatment processed into finished product; The major advantage of this invention be abrasion resistant particles based on boride particle, reduce alloying element addition, thus reduce production cost, and hardness is high, wearability and thermal fatigue resistance good, the uniform in material later stage resists by force accident.Chinese invention patent CN102994692A also discloses a kind of high boron high-speed steel roll material and smelting process thereof, it is characterized in that obtaining through the following step: 1) get the raw materials ready by the mass ratio of following component: the Q235 steel scrap of 73.0 ~ 76.0%, the ferrotungsten of 1.5 ~ 1.8%, the molybdenum-iron of 3.0 ~ 3.3%, the vanadium iron of 1.0 ~ 1.2%, the high carbon ferro-chrome of 6.0 ~ 6.5%, the metallic copper of 0.5 ~ 0.8%, the metallic aluminium of 0.12 ~ 0.16%, the calcium-silicon of 1.2 ~ 1.4%, the RE-Mg-ferrosilicon alloy of 0.20 ~ 0.28%, the ferro-niobium of 0.3 ~ 0.5%, the ferro-boron of 8.2 ~ 8.6%, the ferrosilicon of 0.55 ~ 0.80%, the VN alloy of 0.35 ~ 0.50%, the zirconium ferrosilicon of 1.20 ~ 1.36% and the ferrotianium of 0.15 ~ 0.20%, 2) first by the Q235 steel scrap of mass fraction 73.0 ~ 76.0%, 1.5 ~ 1.8% ferrotungsten, 3.0 ~ 3.3% molybdenum-iron, the high carbon ferro-chrome of 6.0 ~ 6.5%, the metallic copper of 0.5 ~ 0.8% and 0.3 ~ 0.5% ferro-niobium, put into electric furnace, be warming up to 1580 ~ 1600 DEG C, after mixed material heating is melted, add successively the calcium-silicon of 1.2 ~ 1.4%, the vanadium iron of 1.0 ~ 1.2%, the metallic aluminium of 0.12 ~ 0.16% and 3.5 ~ 4.0% ferro-boron, liquid steel temperature is risen to 1610 ~ 1630 DEG C, 3) in casting ladle, adding granularity in advance is 5 ~ 10mm, and through 550 ~ 600 DEG C of preheatings 2 ~ 4 hours, mass fraction be 0.20 ~ 0.28% RE-Mg-ferrosilicon alloy, the ferrotianium of 0.15 ~ 0.20%, the zirconium ferrosilicon of 0.66 ~ 0.80% and 1.5 ~ 1.8% ferro-boron, afterwards by step 2) temperature be the molten steel of 1610 ~ 1630 DEG C, pour in casting ladle, carry out compound modification treatment and Alloying Treatment, (4) molten steel leaves standstill 4 ~ 10 minutes in casting ladle, when liquid steel temperature is down to 1450 ~ 1475 DEG C, by pouring molten steel in casting mold, and in pouring molten steel process, with stream add mass fraction be 0.55 ~ 0.80% ferrosilicon, the VN alloy of 0.35 ~ 0.50%, the zirconium ferrosilicon of 0.45 ~ 0.60% and 2.4 ~ 3.0% ferro-boron, after cooling, obtain high boron high-speed steel roll.Chinese invention patent CN102925820A also discloses a kind of containing aluminium high boron high-speed steel roll material and smelting process, the mass fraction % of chemical composition is: 0.35 ?0.55C, 3.2 ?3.4B, 5.5 ?6.0Cr, <0.85Si, <0.35Mn, 0.5 ?0.7V, 0.7 ?0.9Ni, 1.0 ?3.0W, 1.0 ?2.0Mo, 3.8≤(W+2Mo)≤5.2, 3.7 ?3.9Al, 0.03 ?0.06Ce, 0.03 ?0.06La, 0.06< (La+Ce)≤0.10, 0.12 ?0.15N, 0.05 ?0.08Ca, 0.04 ?0.10Mg, <0.03S, <0.04P, all the other are Fe.Utilize electro-smelting, adopt casting method shaping, fine finishining after Quench and temper.This invention roll material room temperature and high temperature hardness high, high temperature abrasion resistance is good.Chinese invention patent CN102847713A also discloses a kind of Wearable hot roll, comprise hot roll body, described inner body wall is provided with water cooling layer, and described body outer wall is coated with WC cemented carbide layer, is coated with nano ceramic coat outside described WC cemented carbide layer.This Wearable hot roll is owing to being coated with WC cemented carbide layer at body surface, nano ceramic coat is coated with outside WC cemented carbide layer, there is heat insulation and preservation effect, do not come off, do not burn, water-fast, moistureproof, and lubricant effect is better, substantially increases mechanical performance and the chemical property of this hot roll, water cooling layer can play good cooling effect, longer service life simultaneously.Chinese invention patent CN102828123A also discloses the method for the outer Metamorphism treatment of a kind of centrifugal compound casting high-speed steel roll, it is characterized in that, when the melting of layer high-speed steel completes and comes out of the stove outside, in ladle, add composite modifier Metamorphism treatment is carried out to high-speed steel molten iron, the addition of composite modifier is 1.0 ~ 2.0% of Metal Weight, and reaction temperature is 1500 ~ 1600 DEG C.The chemical component weight percentage of described composite modifier is: vanadium iron FeV5050 ~ 55%, rare earth ferrosilicon alloy FeSiRe2120 ~ 25%, Si-Ba alloy FeBa5Si6020 ~ 25%, Al5 ~ 10%.Compared with prior art, the advantage of this invention is: refinement is cast crystal grain and improved chromium, carbide morphology, the tiny spherical MC type carbide of even dispersion distribution, improves the outer field wear-resisting and heat resistance of high-speed steel roll, makes roll millimeter stocking increase by 25% ~ 30% on year-on-year basis.Chinese invention patent CN102626774A also discloses a kind of manufacture method of bimetallic compound chilled cast iron roll, comprise outer chilled cast iron high-abrasive material and internal layer and support gray iron material melting, centrifugal casting-mould preparation, centrifugal casting, cooling, demoulding pickup operation, the matrix structure of outer chilled cast iron high-abrasive material is: carbide content 40 ~ 50%, content of pearlite in alloy 40 ~ 50%, Lay formula body burden 0 ~ 20%; Cooling velocity during centrifugal casting is: drop to 1180 DEG C of interval cooling velocities from 1350 DEG C and control be greater than 80 DEG C/min, dropping to 720 DEG C of interval cooling velocities from 1180 DEG C is 20 ~ 25 DEG C/min, and the cooling velocity dropping to normal temperature interval from 720 DEG C controls be less than 30 DEG C/h.The advantage of this invention is: utilize the produced outer material of roll crystal grain of the method comparatively thin and evenly, and roll body hardness radially, axial stiffness change is less; Tensile strength is strong, and wearability is good, long service life.Chinese invention patent CN102615106A also discloses a kind of 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%.Chinese invention patent CN102615107A also discloses a kind of high-sulfur alloy centrifugal composite nodular cast iron roll, is made up of, it is characterized in that outer and core, described skin comprises the following ingredients formed by mass percentage: C:2.8 ~ 3.6, Si:0.8 ~ 1.9, Mn:0.6 ~ 1.3, Cr:1.5 ~ 2.8, Mo:0.4 ~ 0.8, W:0.3 ~ 0.9, Ae:0.4 ~ 0.8, V:0.1 ~ 0.5, S:1.9 ~ 3.0, P :≤0.08, Re: >=0.05, all the other are Fe; Described core comprises the following ingredients formed by mass percentage: C:3.0 ~ 3.5, Si:1.9 ~ 2.5, Mn:0.4 ~ 1.2, Cr :≤0.4, Mo :≤0.2, W :≤0.1, Ae :≤0.1, V:0.1, S:0.04, P :≤0.1, Re: >=0.05, all the other are Fe.Chinese invention patent CN102330037A also discloses a kind of alloy roller with wearability and high-fire resistance, and contained by it, various components based on weight percentage is: C:2.5% ~ 3.5%; Si:< 2.0%; Mn:1.6% ~ 2.0%; P :≤0.06%; S :≤0.05%; Cu :≤0.2%; As :≤0.10%; Cr:1.5% ~ 2.0%; Ni:10.0% ~ 20.0%; Mo:10.5% ~ 15.0%; Surplus is Fe.This alloy roller with wearability and high-fire resistance, by increasing considerably the content of Ni, Mo element, improves the heat-resistant antifriction performance of alloy roller, and extends the service life that this has the alloy roller of wearability and high-fire resistance.Chinese invention patent CN102366830A also discloses a kind of casting method of boron-containing roller, and the skin of described boron-containing roller adopts centre spinning method to be shaped, and roller core adopts spheroidal graphite cast-iron, and with teeming method castable; Described outer field chemical composition and percentage by weight are C:3.2 ~ 3.5%, Si:0.2 ~ 0.4%, B:1.2 ~ 1.6%, Cr:6.3 ~ 7.0%, Mn:1.6 ~ 1.8%, V:1.5 ~ 1.8%, Mo:2.2 ~ 2.8%, W:1.2 ~ 1.6%, Nb:0.1 ~ 0.3%, Ce:0.25 ~ 0.35%, Ti:0.3 ~ 0.5%, S < 0.03%, P < 0.04%, all the other are Fe; Said method comprising the steps of: 1. by ordinary scrap steel, ferrochrome, the pig iron, ferrotungsten, molybdenum-iron, the fusing of ferro-niobium Hybrid Heating, add ferrosilicon and ferromanganese after molten steel is melting down, before coming out of the stove, add vanadium iron; 2. stokehold adjusting component qualified after, temperature is risen to 1560 ~ 1580 DEG C, adds the aluminium deoxidation accounting for above-mentioned steel quality 0.15 ~ 0.20%, then add ferrotianium and ferro-boron successively, come out of the stove when liquid steel temperature reaches 1580 ~ 1600 DEG C; 3. cerium-based rare earth being crushed to the fritter of granularity 5 ~ 7mm, after drying through 160 ~ 200 DEG C, being placed in bottom casting ladle, with pouring method in bag, compound modification treatment being carried out to molten steel; 4. skin of the roll is poured into a mould with centrifugal casting machine, outer pouring molten steel temperature is 1470 ~ 1480 DEG C, when skin of the roll solidifies completely, and when skin of the roll internal surface temperature reaches 1165 ~ 1175 DEG C, cast roller core spheroidal graphite cast-iron, roller core spheroidal graphite cast-iron pouring temperature is 1340 ~ 1370 DEG C; 5. roll cast was devaned after 12 ~ 24 hours, was then placed in burial pit, cut dead head after being cooled to room temperature, roughing after cleaning undesirable root, overlap, burr; 6. heat-treated by the roll after roughing, described heat treatment comprises quench hot and temper, quenching temperature 1000 DEG C ~ 1050 DEG C, temperature retention time 2 ~ 4 hours.During quench cooled, first misting cooling 10 ~ 20 minutes, subsequently air cooling to roll surface temperature lower than 200 DEG C time, enter heating furnace and carry out first time temper, tempering heating-up temperature 520 DEG C ~ 560 DEG C, be incubated air cooling after 5 ~ 8 hours, when roll surface temperature is lower than 200 DEG C, enters heating furnace and carry out second time temper, tempering heating-up temperature 500 DEG C ~ 540 DEG C, be incubated stove after 8 ~ 12 hours cold, come out of the stove after furnace temperature is lower than 200 DEG C, and be refined to given size.Chinese invention patent CN102319897A also discloses a kind of manufacture method of spray formed high-vanadium high-speed steel composite roller.High-vanadium high-speed steel chemical composition (mass fraction, %) is: 1.7 ?1.8C, 1.2 ?1.6Si, 5.0 ?6.0Cr, 1.2 ?1.4Mo, 0.5 ?0.6Mn, 8.0 ?10.0V, surplus is Fe; Described roll roller core is nodular cast iron.This invention also discloses the preparation method of above-mentioned radiation roll: roller core induction coil is preheating to uniform temperature, simultaneously by the melting in vaccum sensitive stove of outer high-speed steel, adopt the method for reaction-injection moulding, combined shaping by high-speed steel metal liquid stream nitrogen atomization and on the roller core being deposited on rotation.This composite roll outer tissue is even, eliminate thick eutectic carbide and microstructure segregation, good metallurgical binding is formed between roller core and jetted layers, roll surface hardness is high, wearability is good, and fatigue behaviour improves, longer service life, along with the maturation of equipment, reaction-injection moulding composite roll has higher better economic benefit.
But above-mentioned abrasion-resistant roller technology of preparing or there is complex process or there is roller performance low service life short or there is the high deficiency of the many manufacturing costs of roll precious alloy addition, limits it and applies.
Summary of the invention
The present invention is directed to existing roll produce in Problems existing, with the alloy iron filings of processing roll and steel scrap for main alloy element, and supplement a small amount of ferroalloy, invent a kind of resource-conserving high-boron high-speed steel composite roller.
Object of the present invention can be realized by following measures:
Resource-conserving high-boron high-speed steel composite roller of the present invention is made up of carbon round steel three part in outer high-boron high-speed steel and intermediate layer graphitic steel and roller core hot rolling, its ectomesoderm high-boron high-speed steel and intermediate layer graphitic steel are formed by centrifugal compound, and carbon round steel is composited by hot charging in transition zone graphitic steel and roller core hot rolling, its concrete preparation technology, comprises the steps:
1. first in electric furnace, steel scrap is adopted, high-chromium iron-cast roller waste material, high Ni-Cr infinite cold hardness cast iron roll waste material and high-speed steel roll waste material and ferro-boron, ferrochrome, ferrotungsten and the outer high-boron high-speed steel of molybdenum-iron melting, chemical composition and the mass fraction thereof of outer high-boron high-speed steel molten steel are: 1.5 ~ 2.5%C, 0.3 ~ 1.0%B, 12 ~ 25%Cr, 0.5 ~ 3.0%Mo, 0.3 ~ 2.0%W, 0.5 ~ 1.8%Ni, 0.2 ~ 1.2%V, <1.2%Co, <1.0%Nb, <1.2%Si, <1.2%Mn, <0.08%P, <0.05%S, surplus is Fe and inevitable impurity, after outer high-boron high-speed steel molten steel composition adjustment is qualified, its temperature is risen to 1580 ~ 1600 DEG C, and add metallic aluminium deoxidation and the microalloying of calsibar alloy and 0.12 ~ 0.25% accounting for steel quality mark 0.5 ~ 0.8% in stove, be incubated after 2 ~ 3 minutes, molten steel to be come out of the stove to ladle, molten steel is come out of the stove in process, by the ferrotianium of particle size 5 ~ 10mm, rare earth ferrosilicon and vanadium iron enter ladle with steel flow, wherein ferrotianium, rare earth ferrosilicon and vanadium iron addition account for respectively and enter 0.20 ~ 0.35% of steel quality mark in ladle, 0.35 ~ 0.50% and 0.15 ~ 0.30%,
2. step 1. outer high-boron high-speed steel molten steel after skimming and leaving standstill, when temperature is down to 1440 ~ 1470 DEG C, poured in the casting mold on the horizontal centrifuge of rotation (speed is preferably 650 ~ 1250rpm), centrifuge rotates after 5 ~ 8 minutes, intermediate layer graphitic steel molten steel is poured into casting mold, chemical composition and the mass fraction thereof of intermediate layer graphitic steel molten steel are: 1.4 ~ 1.8%C, 1.4 ~ 2.0%Si, 0.3 ~ 0.9%Mn, 0.3 ~ 0.6%Cu, 0.03 ~ 0.06%N, 0.08 ~ 0.12%V, 0.03 ~ 0.06%RE, 0.02 ~ 0.05%Mg, 0.35 ~ 0.50%Mo, P<0.040%, S<0.035%, surplus is Fe and inevitable impurity, the pouring temperature of intermediate layer graphitic steel molten steel is 1460 ~ 1490 DEG C, cast thickness is 15 ~ 25mm, when shutting down after the graphitic steel molten steel solidification of intermediate layer, taking out roller shell foundry goods, entering holding furnace or burial pit and slowly cooling to temperature lower than air cooling after 300 DEG C to room temperature,
3. step 2. gained roller shell foundry goods after roughing, be heated to 500 ~ 550 DEG C, be incubated after 10 ~ 15 hours, stove is chilled to when temperature is 300 ~ 350 DEG C and comes out of the stove, with the roller core hot charging compound processed by carbon round steel in hot rolling, be combined into high-boron high-speed steel composite roller, the magnitude of interference of hot charging compound is 0.12 ~ 0.20mm, finally composite roll is refined to given size and precision.
Chemical composition and the mass fraction thereof of high-chromium iron-cast roller waste material as above are: 2.30 ~ 3.30%C, 0.30 ~ 1.00%Si, 0.50 ~ 1.20%Mn, P≤0.10%, S≤0.05%, 0.70 ~ 1.70%Ni, 18.01 ~ 22.00%Cr, 1.51 ~ 3.00%Mo, 0.00 ~ 0.60%V, surplus is Fe and inevitable impurity.
Chemical composition and the mass fraction thereof of high Minvar indefinite chill roll waste material as above are: 2.90 ~ 3.60%C, 0.60 ~ 1.50%Si, 0.40 ~ 1.20%Mn, P≤0.10%, S≤0.05%, 3.01 ~ 4.80%Ni, 1.00 ~ 2.00%Cr, 0.20 ~ 1.00%Mo, surplus is Fe and inevitable impurity.
Chemical composition and the mass fraction thereof of high-speed steel roll waste material as above are: 1.50 ~ 2.20%C, 0.30 ~ 1.00%Si, 0.40 ~ 1.20%Mn, 3.00 ~ 8.00%Cr, 0.00 ~ 1.50%Ni, 2.00 ~ 8.00%Mo, 2.00 ~ 9.00%V, 0.00 ~ 8.00%W, 0.00 ~ 8.00%Co, 0.00 ~ 5.00%Nb, P≤0.05%, S≤0.05%, surplus is Fe and inevitable impurity.
The chemical composition of calsibar alloy as above and mass fraction are: 40 ~ 45%Si, 10 ~ 12%Ca, 10 ~ 12%Ba ,≤0.8%C ,≤0.04%P ,≤0.06%S, and surplus is Fe and inevitable impurity.
The chemical composition of rare earth ferrosilicon as above and mass fraction are: 27.0 ~ 30.0%RE, 38.0 ~ 42.0%Si, <3.0%Mn, <5.0%Ca, <3.0%Ti, and surplus is Fe and inevitable impurity.
The chemical composition of vanadium iron as above and mass fraction are: 58 ~ 65%V ,≤2.0%Si ,≤2.5%Al ,≤0.06%C ,≤0.05%P ,≤0.05%S ,≤0.1%Cu, and surplus is Fe and inevitable impurity.
The chemical composition of ferrotianium as above and mass fraction are: 38 ~ 42%Ti ,≤9.0%Al ,≤3.0%Si ,≤0.03%S ,≤0.03%P ,≤0.10%C ,≤0.40%Cu ,≤2.5%Mn, and surplus is Fe and inevitable impurity.
Resource-conserving high-boron high-speed steel composite roller of the present invention is made up of carbon round steel three part in outer high-boron high-speed steel and intermediate layer graphitic steel and roller core hot rolling, and its ectomesoderm high-boron high-speed steel mainly plays wear-resisting effect.And intermediate layer adopts graphitic steel to be utilize its high strength and excellent processing characteristics, outer high-boron high-speed steel and intermediate layer graphitic steel are formed by centrifugal compound, and both can realize firm metallurgical binding.Roller core adopts carbon round steel in hot rolling, with low cost, and can reuse.In transition zone graphitic steel and roller core hot rolling, carbon round steel is composited by hot charging, simple process, can realize rapid batch and produce.
The present invention is in order to ensure the performance of roll, and control manufacturing cost, outer material of roll of the present invention is with steel scrap, high-chromium iron-cast roller waste material, high Ni-Cr infinite cold hardness cast iron roll waste material and high-speed steel roll waste material are main, and add appropriate ferro-boron, ferrochrome, ferrotungsten and molybdenum-iron, chemical composition and the mass fraction thereof of outer high-boron high-speed steel molten steel are: 1.5 ~ 2.5%C, 0.3 ~ 1.0%B, 12 ~ 25%Cr, 0.5 ~ 3.0%Mo, 0.3 ~ 2.0%W, 0.5 ~ 1.8%Ni, 0.2 ~ 1.2%V, <1.2%Co, <1.0%Nb, <1.2%Si, <1.2%Mn, <0.08%P, <0.05%S, surplus is Fe and inevitable impurity, can guarantee there is the wear-resistant phase of the carbon boride of high rigidity in skin of the roll tissue like this, matrix is based on the martensite of high rigidity.In order to improve outer high-boron high-speed steel steel quality, improve cladding material performance, after the present invention's floor height boron high-speed steel molten steel composition adjustment is outside qualified, its temperature is risen to 1580 ~ 1600 DEG C, and add metallic aluminium deoxidation and the microalloying of calsibar alloy and 0.12 ~ 0.25% accounting for steel quality mark 0.5 ~ 0.8% in stove, be incubated after 2 ~ 3 minutes, molten steel to be come out of the stove to ladle, molten steel is come out of the stove in process, by the ferrotianium of particle size 5 ~ 10mm, rare earth ferrosilicon and vanadium iron enter ladle with steel flow, wherein ferrotianium, rare earth ferrosilicon and vanadium iron addition account for respectively and enter 0.20 ~ 0.35% of steel quality mark in ladle, 0.35 ~ 0.50% and 0.15 ~ 0.30%, be conducive to refinement and purification solidified structure like this, improve the obdurability of cladding material, there is cracking in preventing cladding material from using and peel off.
Chemical composition and the mass fraction thereof of intermediate layer of the present invention graphitic steel molten steel are: 1.4 ~ 1.8%C, 1.4 ~ 2.0%Si, 0.3 ~ 0.9%Mn, 0.3 ~ 0.6%Cu, 0.03 ~ 0.06%N, 0.08 ~ 0.12%V, 0.03 ~ 0.06%RE, 0.02 ~ 0.05%Mg, 0.35 ~ 0.50%Mo, P<0.040%, S<0.035%, surplus is Fe and inevitable impurity, can guarantee that intermediate layer has high strength and high tenacity like this, is conducive to the security improving work roll cooling.
The skin of composite roll of the present invention and intermediate layer are after roughing, be heated to 500 ~ 550 DEG C, be incubated after 10 ~ 15 hours, mainly in order to eliminate stress, stabilizing tissue and force the austenite transforms in as cast condition matrix to be the martensite of high rigidity, is conducive to improving roll wearability further.The skin of composite roll and intermediate layer stove are chilled to when temperature is 300 ~ 350 DEG C and come out of the stove, can guarantee to realize hot charging compound with the roller core processed by carbon round steel in hot rolling, be combined into high-boron high-speed steel composite roller, the magnitude of interference of hot charging compound is 0.12 ~ 0.20mm, can guarantee to there will not be the accident of press-offing in work roll cooling process.
The present invention compared with prior art, has following advantage:
1) composite roll of the present invention is made up of carbon round steel three part in outer high-boron high-speed steel and intermediate layer graphitic steel and roller core hot rolling, makes work roll cooling safety;
2) outer material of roll of the present invention is based on steel scrap, high-chromium iron-cast roller waste material, high Ni-Cr infinite cold hardness cast iron roll waste material and high-speed steel roll waste material, and adds appropriate ferro-boron, ferrochrome, ferrotungsten and molybdenum-iron, is conducive to significantly reducing roll production cost;
3) roller core of roll of the present invention is processed by carbon round steel in hot rolling, can reuse;
4) roll barrel hardness of the present invention is greater than 83HSD, has excellent wearability.
Accompanying drawing explanation
Fig. 1 high-boron high-speed steel composite roller schematic diagram;
1 ?carbon round steel in roller core hot rolling, 2 ?outer high-boron high-speed steel, 3 ?intermediate layer graphitic steel.
Detailed description of the invention
Be further described the present invention below in conjunction with embodiment, Fig. 1 is shown in by high-boron high-speed steel composite roller schematic diagram, but the present invention is not limited to following examples.
Embodiment 1:
Resource-conserving high-boron high-speed steel composite roller (barrel length 600mm of the present invention, barrel diameter 320mm) be made up of carbon round steel three part in outer high-boron high-speed steel and intermediate layer graphitic steel and roller core hot rolling, its ectomesoderm high-boron high-speed steel and intermediate layer graphitic steel adopt 1000 kilograms and 500 kilograms of medium-frequency induction furnace meltings respectively, be composited by horizontal centrifuge, and in transition zone graphitic steel and roller core hot rolling, carbon round steel is composited by hot charging.Its concrete preparation technology is:
1. first in electric furnace, steel scrap is adopted, (chemical composition and the mass fraction thereof of high-chromium iron-cast roller waste material are high-chromium iron-cast roller waste material: 2.30 ~ 3.30%C, 0.30 ~ 1.00%Si, 0.50 ~ 1.20%Mn, P≤0.10%, S≤0.05%, 0.70 ~ 1.70%Ni, 18.01 ~ 22.00%Cr, 1.51 ~ 3.00%Mo, 0.00 ~ 0.60%V, surplus is Fe and inevitable impurity), (chemical composition and the mass fraction thereof of high Minvar indefinite chill roll waste material are high Ni-Cr infinite cold hardness cast iron roll waste material: 2.90 ~ 3.60%C, 0.60 ~ 1.50%Si, 0.40 ~ 1.20%Mn, P≤0.10%, S≤0.05%, 3.01 ~ 4.80%Ni, 1.00 ~ 2.00%Cr, 0.20 ~ 1.00%Mo, surplus is Fe and inevitable impurity) and high-speed steel roll waste material (chemical composition and the mass fraction thereof of high-speed steel roll waste material are: 1.50 ~ 2.20%C, 0.30 ~ 1.00%Si, 0.40 ~ 1.20%Mn, 3.00 ~ 8.00%Cr, 0.00 ~ 1.50%Ni, 2.00 ~ 8.00%Mo, 2.00 ~ 9.00%V, 0.00 ~ 8.00%W, 0.00 ~ 8.00%Co, 0.00 ~ 5.00%Nb, P≤0.05%, S≤0.05%, surplus is Fe and inevitable impurity) and ferro-boron, ferrochrome, ferrotungsten and the outer high-boron high-speed steel of molybdenum-iron melting, chemical composition and the mass fraction thereof of outer high-boron high-speed steel molten steel are: 1.53%C, 0.99%B, 14.77%Cr, 1.16%Mo, 0.38%W, 0.75%Ni, 0.29%V, 0.78%Co, 0.03%Nb, 0.64%Si, 0.70%Mn, 0.057%P, 0.041%S, surplus is Fe and inevitable impurity.After outer high-boron high-speed steel molten steel composition adjustment is qualified, its temperature is risen to 1582 DEG C, and (chemical composition of calsibar alloy and mass fraction are: 42.08%Si to add the calsibar alloy accounting for steel quality mark 0.5% in stove, 11.69%Ca, 11.30%Ba, 0.28%C, 0.037%P, 0.046%S, surplus is Fe and inevitable impurity) and 0.25% metallic aluminium deoxidation and microalloying, be incubated after 3 minutes, molten steel to be come out of the stove to ladle, molten steel is come out of the stove in process, by the ferrotianium of particle size 5 ~ 10mm, (chemical composition of ferrotianium and mass fraction are: 39.66%Ti, 5.08%Al, 1.93%Si, 0.021%S, 0.028%P, 0.07%C, 0.28%Cu, 1.27%Mn, surplus is Fe and inevitable impurity), (chemical composition of rare earth ferrosilicon and mass fraction are rare earth ferrosilicon: 28.95%RE, 39.90%Si, 1.81%Mn, 2.67%Ca, 1.04%Ti, surplus is Fe and inevitable impurity) and vanadium iron (chemical composition of vanadium iron and mass fraction are: 62.80%V, 1.26%Si, 1.99%Al, 0.05%C, 0.037%P, 0.029%S, 0.03%Cu, surplus is Fe and inevitable impurity) enter ladle with steel flow, wherein ferrotianium, rare earth ferrosilicon and vanadium iron addition account for respectively and enter 0.20% of steel quality mark in ladle, 0.35% and 0.30%.
2. outer high-boron high-speed steel molten steel is after skimming and leaving standstill, and when temperature is down to 1445 DEG C, is poured in the casting mold on horizontal centrifuge that rotary speed is 1050rpm, after centrifuge rotates 5 minutes, intermediate layer graphitic steel molten steel is poured into casting mold, chemical composition and the mass fraction thereof of intermediate layer graphitic steel molten steel are: 1.42%C, 1.97%Si, 0.30%Mn, 0.59%Cu, 0.03%N, 0.08%V, 0.06%RE, 0.04%Mg, 0.39%Mo, 0.037%P, 0.030%S, surplus is Fe and inevitable impurity.The pouring temperature of intermediate layer graphitic steel molten steel is 1488 DEG C, and cast thickness is 15mm.When shutting down after the graphitic steel molten steel solidification of intermediate layer, taking out roller shell foundry goods, entering holding furnace and slowly cooling to temperature lower than air cooling after 300 DEG C to room temperature.
3. roller shell foundry goods is after roughing, be heated to 520 DEG C, be incubated after 12 hours, stove is chilled to when temperature is 320 DEG C and comes out of the stove, roller core hot charging compound with being processed by carbon round steel in hot rolling, is combined into high-boron high-speed steel composite roller, and the magnitude of interference of hot charging compound is 0.12mm, finally composite roll is refined to given size and precision, the performance of high-boron high-speed steel composite roller is in table 1.
Embodiment 2:
Resource-conserving high-boron high-speed steel composite roller (barrel length 600mm of the present invention, barrel diameter 350mm) be made up of carbon round steel three part in outer high-boron high-speed steel and intermediate layer graphitic steel and roller core hot rolling, its ectomesoderm high-boron high-speed steel and intermediate layer graphitic steel adopt 1000 kilograms and 500 kilograms of medium-frequency induction furnace meltings respectively, be composited by horizontal centrifuge, and in transition zone graphitic steel and roller core hot rolling, carbon round steel is composited by hot charging.Its concrete preparation technology is:
1. first in electric furnace, steel scrap is adopted, (chemical composition and the mass fraction thereof of high-chromium iron-cast roller waste material are high-chromium iron-cast roller waste material: 2.30 ~ 3.30%C, 0.30 ~ 1.00%Si, 0.50 ~ 1.20%Mn, P≤0.10%, S≤0.05%, 0.70 ~ 1.70%Ni, 18.01 ~ 22.00%Cr, 1.51 ~ 3.00%Mo, 0.00 ~ 0.60%V, surplus is Fe and inevitable impurity), (chemical composition and the mass fraction thereof of high Minvar indefinite chill roll waste material are high Ni-Cr infinite cold hardness cast iron roll waste material: 2.90 ~ 3.60%C, 0.60 ~ 1.50%Si, 0.40 ~ 1.20%Mn, P≤0.10%, S≤0.05%, 3.01 ~ 4.80%Ni, 1.00 ~ 2.00%Cr, 0.20 ~ 1.00%Mo, surplus is Fe and inevitable impurity) and high-speed steel roll waste material (chemical composition and the mass fraction thereof of high-speed steel roll waste material are: 1.50 ~ 2.20%C, 0.30 ~ 1.00%Si, 0.40 ~ 1.20%Mn, 3.00 ~ 8.00%Cr, 0.00 ~ 1.50%Ni, 2.00 ~ 8.00%Mo, 2.00 ~ 9.00%V, 0.00 ~ 8.00%W, 0.00 ~ 8.00%Co, 0.00 ~ 5.00%Nb, P≤0.05%, S≤0.05%, surplus is Fe and inevitable impurity) and ferro-boron, ferrochrome, ferrotungsten and the outer high-boron high-speed steel of molybdenum-iron melting, chemical composition and the mass fraction thereof of outer high-boron high-speed steel molten steel are: 2.48%C, 0.33%B, 22.13%Cr, 0.51%Mo, 0.37%W, 1.76%Ni, 1.19%V, 0.03%Co, 0.27%Nb, 0.92%Si, 1.03%Mn, 0.063%P, 0.039%S, surplus is Fe and inevitable impurity.After outer high-boron high-speed steel molten steel composition adjustment is qualified, its temperature is risen to 1597 DEG C, and (chemical composition of calsibar alloy and mass fraction are: 42.08%Si to add the calsibar alloy accounting for steel quality mark 0.8% in stove, 11.69%Ca, 11.30%Ba, 0.28%C, 0.037%P, 0.046%S, surplus is Fe and inevitable impurity) and 0.12% metallic aluminium deoxidation and microalloying, be incubated after 2 minutes, molten steel to be come out of the stove to ladle, molten steel is come out of the stove in process, by the ferrotianium of particle size 5 ~ 10mm, (chemical composition of ferrotianium and mass fraction are: 39.66%Ti, 5.08%Al, 1.93%Si, 0.021%S, 0.028%P, 0.07%C, 0.28%Cu, 1.27%Mn, surplus is Fe and inevitable impurity), (chemical composition of rare earth ferrosilicon and mass fraction are rare earth ferrosilicon: 28.95%RE, 39.90%Si, 1.81%Mn, 2.67%Ca, 1.04%Ti, surplus is Fe and inevitable impurity) and vanadium iron (chemical composition of vanadium iron and mass fraction are: 62.80%V, 1.26%Si, 1.99%Al, 0.05%C, 0.037%P, 0.029%S, 0.03%Cu, surplus is Fe and inevitable impurity) enter ladle with steel flow, wherein ferrotianium, rare earth ferrosilicon and vanadium iron addition account for respectively and enter 0.35% of steel quality mark in ladle, 0.50% and 0.15%.
2. outer high-boron high-speed steel molten steel is after skimming and leaving standstill, and when temperature is down to 1467 DEG C, is poured in the casting mold on horizontal centrifuge that rotary speed is 900rpm, after centrifuge rotates 8 minutes, intermediate layer graphitic steel molten steel is poured into casting mold, chemical composition and the mass fraction thereof of intermediate layer graphitic steel molten steel are: 1.77%C, 1.40%Si, 0.76%Mn, 0.31%Cu, 0.06%N, 0.12%V, 0.03%RE, 0.02%Mg, 0.36%Mo, 0.035%P, 0.027%S, surplus is Fe and inevitable impurity.The pouring temperature of intermediate layer graphitic steel molten steel is 1462 DEG C, and cast thickness is 20mm.When shutting down after the graphitic steel molten steel solidification of intermediate layer, taking out roller shell foundry goods, entering burial pit and slowly cooling to temperature lower than air cooling after 300 DEG C to room temperature.
3. roller shell foundry goods is after roughing, be heated to 500 DEG C, be incubated after 15 hours, stove is chilled to when temperature is 350 DEG C and comes out of the stove, roller core hot charging compound with being processed by carbon round steel in hot rolling, is combined into high-boron high-speed steel composite roller, and the magnitude of interference of hot charging compound is 0.16mm, finally composite roll is refined to given size and precision, the performance of high-boron high-speed steel composite roller is in table 1.
Embodiment 3:
Resource-conserving high-boron high-speed steel composite roller (barrel length 650mm of the present invention, barrel diameter 380mm) be made up of carbon round steel three part in outer high-boron high-speed steel and intermediate layer graphitic steel and roller core hot rolling, its ectomesoderm high-boron high-speed steel and intermediate layer graphitic steel adopt 1000 kilograms and 500 kilograms of medium-frequency induction furnace meltings respectively, be composited by horizontal centrifuge, and in transition zone graphitic steel and roller core hot rolling, carbon round steel is composited by hot charging.Its concrete preparation technology is:
1. first in electric furnace, steel scrap is adopted, (chemical composition and the mass fraction thereof of high-chromium iron-cast roller waste material are high-chromium iron-cast roller waste material: 2.30 ~ 3.30%C, 0.30 ~ 1.00%Si, 0.50 ~ 1.20%Mn, P≤0.10%, S≤0.05%, 0.70 ~ 1.70%Ni, 18.01 ~ 22.00%Cr, 1.51 ~ 3.00%Mo, 0.00 ~ 0.60%V, surplus is Fe and inevitable impurity), (chemical composition and the mass fraction thereof of high Minvar indefinite chill roll waste material are high Ni-Cr infinite cold hardness cast iron roll waste material: 2.90 ~ 3.60%C, 0.60 ~ 1.50%Si, 0.40 ~ 1.20%Mn, P≤0.10%, S≤0.05%, 3.01 ~ 4.80%Ni, 1.00 ~ 2.00%Cr, 0.20 ~ 1.00%Mo, surplus is Fe and inevitable impurity) and high-speed steel roll waste material (chemical composition and the mass fraction thereof of high-speed steel roll waste material are: 1.50 ~ 2.20%C, 0.30 ~ 1.00%Si, 0.40 ~ 1.20%Mn, 3.00 ~ 8.00%Cr, 0.00 ~ 1.50%Ni, 2.00 ~ 8.00%Mo, 2.00 ~ 9.00%V, 0.00 ~ 8.00%W, 0.00 ~ 8.00%Co, 0.00 ~ 5.00%Nb, P≤0.05%, S≤0.05%, surplus is Fe and inevitable impurity) and ferro-boron, ferrochrome, ferrotungsten and the outer high-boron high-speed steel of molybdenum-iron melting, chemical composition and the mass fraction thereof of outer high-boron high-speed steel molten steel are: 1.90%C, 0.85%B, 12.35%Cr, 2.89%Mo, 1.04%W, 0.59%Ni, 0.21%V, 0.08%Co, 0.01%Nb, 0.71%Si, 0.50%Mn, 0.047%P, 0.032%S, surplus is Fe and inevitable impurity.After outer high-boron high-speed steel molten steel composition adjustment is qualified, its temperature is risen to 1593 DEG C, and (chemical composition of calsibar alloy and mass fraction are: 42.08%Si to add the calsibar alloy accounting for steel quality mark 0.6% in stove, 11.69%Ca, 11.30%Ba, 0.28%C, 0.037%P, 0.046%S, surplus is Fe and inevitable impurity) and 0.18% metallic aluminium deoxidation and microalloying, be incubated after 3 minutes, molten steel to be come out of the stove to ladle, molten steel is come out of the stove in process, by the ferrotianium of particle size 5 ~ 10mm, (chemical composition of ferrotianium and mass fraction are: 39.66%Ti, 5.08%Al, 1.93%Si, 0.021%S, 0.028%P, 0.07%C, 0.28%Cu, 1.27%Mn, surplus is Fe and inevitable impurity), (chemical composition of rare earth ferrosilicon and mass fraction are rare earth ferrosilicon: 28.95%RE, 39.90%Si, 1.81%Mn, 2.67%Ca, 1.04%Ti, surplus is Fe and inevitable impurity) and vanadium iron (chemical composition of vanadium iron and mass fraction are: 62.80%V, 1.26%Si, 1.99%Al, 0.05%C, 0.037%P, 0.029%S, 0.03%Cu, surplus is Fe and inevitable impurity) enter ladle with steel flow, wherein ferrotianium, rare earth ferrosilicon and vanadium iron addition account for respectively and enter 0.25% of steel quality mark in ladle, 0.40% and 0.25%.
2. outer high-boron high-speed steel molten steel is after skimming and leaving standstill, and when temperature is down to 1457 DEG C, is poured in the casting mold on horizontal centrifuge that rotary speed is 700rpm, after centrifuge rotates 6 minutes, intermediate layer graphitic steel molten steel is poured into casting mold, chemical composition and the mass fraction thereof of intermediate layer graphitic steel molten steel are: 1.67%C, 1.70%Si, 0.62%Mn, 0.45%Cu, 0.04%N, 0.09%V, 0.05%RE, 0.04%Mg, 0.41%Mo, 0.030%P, 0.031%S, surplus is Fe and inevitable impurity.The pouring temperature of intermediate layer graphitic steel molten steel is 1476 DEG C, and cast thickness is 25mm.When shutting down after the graphitic steel molten steel solidification of intermediate layer, taking out roller shell foundry goods, entering burial pit and slowly cooling to temperature lower than air cooling after 300 DEG C to room temperature.
3. roller shell foundry goods is after roughing, be heated to 550 DEG C, be incubated after 12 hours, stove is chilled to when temperature is 300 DEG C and comes out of the stove, roller core hot charging compound with being processed by carbon round steel in hot rolling, is combined into high-boron high-speed steel composite roller, and the magnitude of interference of hot charging compound is 0.20mm, finally composite roll is refined to given size and precision, the performance of high-boron high-speed steel composite roller is in table 1.
The performance of table 1 high-boron high-speed steel composite roller
High-boron high-speed steel composite roller roll surface hardness of the present invention is high, and difference of hardness is little, and roll surface uniformity of hardness is good, ensure that composite roll has excellent wearability.Roller core is processed by carbon round steel in hot rolling, there is good obdurability, can guarantee to produce without roll breakage accident in work roll cooling, roll of the present invention uses on bar, wire rod and strip-mill strip, and service life increases substantially than high-chromium iron-cast roller and high Ni-Cr infinite cold hardness cast iron roll.Roll of the present invention, with based on steel scrap, high-chromium iron-cast roller waste material, high Ni-Cr infinite cold hardness cast iron roll waste material and high-speed steel roll waste material, has the advantage that significantly economizes on resources, and applies and has significant economic and social benefit.

Claims (10)

1. the preparation method of a high-boron high-speed steel composite roller, it is characterized in that, this composite roll is made up of carbon round steel three part in outer high-boron high-speed steel and intermediate layer graphitic steel and roller core hot rolling, its ectomesoderm high-boron high-speed steel and intermediate layer graphitic steel are formed by centrifugal compound, and carbon round steel is composited by hot charging in intermediate layer graphitic steel and roller core hot rolling, its concrete preparation technology comprises the following steps:
1. first in electric furnace, steel scrap is adopted, high-chromium iron-cast roller waste material, high Ni-Cr infinite cold hardness cast iron roll waste material and high-speed steel roll waste material and ferro-boron, ferrochrome, ferrotungsten and the outer high-boron high-speed steel of molybdenum-iron melting, chemical composition and the mass fraction thereof of outer high-boron high-speed steel molten steel are: 1.5 ~ 2.5%C, 0.3 ~ 1.0%B, 12 ~ 25%Cr, 0.5 ~ 3.0%Mo, 0.3 ~ 2.0%W, 0.5 ~ 1.8%Ni, 0.2 ~ 1.2%V, <1.2%Co, <1.0%Nb, <1.2%Si, <1.2%Mn, <0.08%P, <0.05%S, surplus is Fe and inevitable impurity, after outer high-boron high-speed steel molten steel composition adjustment is qualified, its temperature is risen to 1580 ~ 1600 DEG C, and add metallic aluminium deoxidation and the microalloying of calsibar alloy and 0.12 ~ 0.25% accounting for steel quality mark 0.5 ~ 0.8% in stove, be incubated after 2 ~ 3 minutes, molten steel to be come out of the stove to ladle, molten steel is come out of the stove in process, by the ferrotianium of particle size 5 ~ 10mm, rare earth ferrosilicon and vanadium iron enter ladle with steel flow, wherein ferrotianium, rare earth ferrosilicon and vanadium iron addition account for respectively and enter 0.20 ~ 0.35% of steel quality mark in ladle, 0.35 ~ 0.50% and 0.15 ~ 0.30%,
2. step 1. outer high-boron high-speed steel molten steel after skimming and leaving standstill, when temperature is down to 1440 ~ 1470 DEG C, poured in the casting mold on the horizontal centrifuge of rotation, centrifuge rotates after 5 ~ 8 minutes, intermediate layer graphitic steel molten steel is poured into casting mold, chemical composition and the mass fraction thereof of intermediate layer graphitic steel molten steel are: 1.4 ~ 1.8%C, 1.4 ~ 2.0%Si, 0.3 ~ 0.9%Mn, 0.3 ~ 0.6%Cu, 0.03 ~ 0.06%N, 0.08 ~ 0.12%V, 0.03 ~ 0.06%RE, 0.02 ~ 0.05%Mg, 0.35 ~ 0.50%Mo, P<0.040%, S<0.035%, surplus is Fe and inevitable impurity, the pouring temperature of intermediate layer graphitic steel molten steel is 1460 ~ 1490 DEG C, cast thickness is 15 ~ 25mm, when shutting down after the graphitic steel molten steel solidification of intermediate layer, taking out roller shell foundry goods, entering holding furnace or burial pit and slowly cooling to temperature lower than air cooling after 300 DEG C to room temperature,
3. step 2. gained roller shell foundry goods after roughing, be heated to 500 ~ 550 DEG C, be incubated after 10 ~ 15 hours, stove is chilled to when temperature is 300 ~ 350 DEG C and comes out of the stove, with the roller core hot charging compound processed by carbon round steel in hot rolling, be combined into high-boron high-speed steel composite roller, the magnitude of interference of hot charging compound is 0.12 ~ 0.20mm, finally composite roll is refined to given size and precision.
2. according to the method for claim 1, it is characterized in that, chemical composition and the mass fraction thereof of high-chromium iron-cast roller waste material are: 2.30 ~ 3.30%C, 0.30 ~ 1.00%Si, 0.50 ~ 1.20%Mn, P≤0.10%, S≤0.05%, 0.70 ~ 1.70%Ni, 18.01 ~ 22.00%Cr, 1.51 ~ 3.00%Mo, 0.00 ~ 0.60%V, surplus is Fe and inevitable impurity.
3. according to the method for claim 1, it is characterized in that, chemical composition and the mass fraction thereof of high Ni-Cr infinite cold hardness cast iron roll waste material are: 2.90 ~ 3.60%C, 0.60 ~ 1.50%Si, 0.40 ~ 1.20%Mn, P≤0.10%, S≤0.05%, 3.01 ~ 4.80%Ni, 1.00 ~ 2.00%Cr, 0.20 ~ 1.00%Mo, surplus is Fe and inevitable impurity.
4. according to the method for claim 1, it is characterized in that, chemical composition and the mass fraction thereof of high-speed steel roll waste material are: 1.50 ~ 2.20%C, 0.30 ~ 1.00%Si, 0.40 ~ 1.20%Mn, 3.00 ~ 8.00%Cr, 0.00 ~ 1.50%Ni, 2.00 ~ 8.00%Mo, 2.00 ~ 9.00%V, 0.00 ~ 8.00%W, 0.00 ~ 8.00%Co, 0.00 ~ 5.00%Nb, P≤0.05%, S≤0.05%, surplus is Fe and inevitable impurity.
5. according to the method for claim 1, it is characterized in that, the chemical composition of calsibar alloy and mass fraction are: 40 ~ 45%Si, 10 ~ 12%Ca, 10 ~ 12%Ba ,≤0.8%C ,≤0.04%P ,≤0.06%S, and surplus is Fe and inevitable impurity.
6. according to the method for claim 1, it is characterized in that, the chemical composition of rare earth ferrosilicon and mass fraction are: 27.0 ~ 30.0%RE, 38.0 ~ 42.0%Si, <3.0%Mn, <5.0%Ca, <3.0%Ti, surplus is Fe and inevitable impurity.
7. according to the method for claim 1, it is characterized in that, the chemical composition of vanadium iron and mass fraction are: 58 ~ 65%V ,≤2.0%Si ,≤2.5%Al ,≤0.06%C ,≤0.05%P ,≤0.05%S ,≤0.1%Cu, and surplus is Fe and inevitable impurity.
8. according to the method for claim 1, it is characterized in that, the chemical composition of ferrotianium and mass fraction are: 38 ~ 42%Ti ,≤9.0%Al, ≤ 3.0%Si ,≤0.03%S ,≤0.03%P ,≤0.10%C, ≤ 0.40%Cu ,≤2.5%Mn, surplus is Fe and inevitable impurity.
9. according to the method for claim 1, it is characterized in that, the rotary speed of step 2. centrifuge is 650 ~ 1250rpm.
10. according to claim 1 ?9 the high-boron high-speed steel composite roller for preparing of either method.
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