CN104525889A - High-speed steel roller manufacturing method - Google Patents
High-speed steel roller manufacturing method Download PDFInfo
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- CN104525889A CN104525889A CN201410853156.4A CN201410853156A CN104525889A CN 104525889 A CN104525889 A CN 104525889A CN 201410853156 A CN201410853156 A CN 201410853156A CN 104525889 A CN104525889 A CN 104525889A
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Abstract
The invention discloses a high-speed steel roller manufacturing method which is suitable for small steel rolling machines and bar mills. The manufacturing method comprises the three process steps of raw material smelting, casting moulding, machining and heat treatment. On the basis that high-speed molten iron is centrifugally poured, firstly, transition layer molten iron is poured, and then the complete replacement of the transition layer molten iron is achieved by pouring core part molten iron. According to the high-speed steel roller manufacturing method, the combination strength of outer layer high-speed steel and the core part molten iron is obviously increased and increased to 500 Mpa or higher from around 350 Mpa in the past, and thus the anti-stripping performance of the combination layer of a roller body of a high-speed steel roller is greatly improved. Meanwhile, the amount of carbide forming elements generated by corrosion to the outer layer by the core part molten iron can be effectively reduced, so that the texture of a roller neck is improved, the tensile strength of the roller neck is increased, and the phenomenon of roller breakage in the using process is effectively eradicated.
Description
Technical field
The present invention relates to the manufacture method of roll, specifically, is a kind of manufacture method of high-speed steel roll being applicable to light-section mill, wire and bar mill.
Background technology
Roll is the strength member on steel rolling mill's rolling mill, is the important consumable part determining rolling mill efficiency and mill bar quality.The pressure produced when roll utilizes a pair or one group of roll rolls is to roll rolloff part, and make rolled piece produce plastic deformation and obtain desirable design shape, therefore, the quality of roll quality is directly connected to the surface quality of rolled products and the production operational availability of rolling mill.Dynamic And Static Loads when it mainly bears rolling, the impact of wearing and tearing and variations in temperature.
High-speed steel starts from 20th century the eighties for making roll.The application of high-speed steel roll is the important component part of modern Rolling production development, is the another major transformation in development of iron & steel industry history after microalloying, Controlled Rolling And Controlled Cooling.High-speed steel roll, is also called high carbon high-speed steel composite roll, and the working layer of roll adopts high carbon high-speed steel, core material many employings spheroidal graphite cast-iron of roll.Containing alloying elements such as a large amount of V, W, Cr, Mo, Nb in high-speed steel roll, there is higher normal temperature hardness (HS82 ~ 90), there is good high temperature red hardness feature simultaneously, still more than HS78 can be ensured more than 500 DEG C, therefore there is excellent high temperature abrasion resistance, be widely used in Rolling production at present.Replace ferrosteel roll, high-chromium iron-cast roller, high-nickel-chromium molybdenum infinitely chilled roll and Needle-like ductile iron roll with high-speed steel roll, for raising amount of rolling, prolongation roll change cycle, there is good effect.
The performance impact of the bond quality breaker roll between the outer high-speed steel of high-speed steel roll and core molten iron is huge.During composite casting, be arranged in the high-speed steel working lining of skin of the roll containing carbide formers such as a large amount of V, W, Cr, and core of the roll is spheroidal graphite cast-iron, the composition of these two kinds of materials differs greatly, a large amount of carbide certainly will can be there is in binder course position, make binder course intensity very low, cause roll to be in use easy to peel off from binder course; On the other hand, due to the corrosion of the external layer high-speed steel of core molten iron, cause a large amount of carbide formers to enter core of the roll, the carbide of core of the roll is increased, finally cause roll pins having intensity to reduce, in using, easily roll breakage phenomenon occurs.
Summary of the invention
The object of this invention is to provide a kind of manufacture method of high-speed steel roll being applicable to light-section mill, wire and bar mill, effectively improve the binder course intensity of high-speed steel roll and the tensile strength of roll neck, can prevent roll from use occurring barrel Spalling and body of roll fracture.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of manufacture method of high-speed steel roll, comprise and adopt layer high-speed steel outside the casting method for centrifugal casting roll body of roll, then employing mould assembling pouring procedure cast core of the roll molten iron, adopting during mould assembling pouring procedure cast core of the roll molten iron is the body of roll model of good for cast outer high-speed steel and roll neck model, under casing are carried out mould assembling form mo(u)ld-box, connects overflow pipe bottom mo(u)ld-box; First in mo(u)ld-box, pour into a mould transition zone molten iron from the top cast gate of mo(u)ld-box, until transition zone molten iron fills up mo(u)ld-box, stops cast after overflow pipe flows out; Then in mo(u)ld-box, cast core molten iron is continued from the top cast gate of mo(u)ld-box, until transition zone molten iron is all ejected rear stopping cast by core molten iron.
The manufacture method of a kind of high-speed steel roll of the present invention specifically comprises following processing step:
A, melting raw material
Outer high-speed steel raw material, transition zone molten iron raw material and core molten iron raw material are carried out melting respectively;
B, moulding by casting
Pour into a mould outer high speed molten steel, transition zone molten iron and core molten iron successively, casting process is:
(1) adopt centrifugal casting method, melted outer high speed molten steel is injected the body of roll model rotated;
(2) after high-speed steel water condensation, the body of roll model of good for cast outer high-speed steel and roll neck model, under casing are carried out mould assembling and forms mo(u)ld-box, bottom under casing, connect overflow pipe; Then by mo(u)ld-box cast gate cast transition zone molten iron; Until transition zone molten iron fills up mo(u)ld-box, flows out from overflow pipe;
(3) cast core molten iron is continued by mo(u)ld-box cast gate, along with the injection of core molten iron, in mo(u)ld-box, original transition zone molten iron flows out gradually from overflow pipe, until transition zone molten iron stops cast after being all replaced into core molten iron, then 200 DEG C ~ 320 DEG C are cooled to, the unpacking demoulding, obtains high-speed steel roller stock;
C, machining and heat treatment
Roller stock is carried out machining, by the working face car of high-speed steel roll to given size; After ultrasonic examination is up to the standards, roller stock is heat-treated, be then cooled to room temperature, obtain high-speed steel roll.
The further improvement of technique scheme of the present invention is: the heat treatment detailed process of described step C is primary quenching+three tempering: quenching is warming up to 1000 ~ 1120 DEG C with the programming rate of 20 ~ 30 DEG C/h, insulation 3 ~ 4h, is cooled to 400 ~ 450 DEG C with the cooling rate of 130 ~ 140 DEG C/h after coming out of the stove; The front of three tempering is for twice be warming up to 500 ~ 550 DEG C with the programming rate of 20 ~ 30 DEG C/h, and insulation 10 ~ 32h, is cooled to room temperature with the cooling rate of 20 ~ 30 DEG C/h after coming out of the stove; Finally be warming up to 500 ~ 550 DEG C with the programming rate of 20 ~ 30 DEG C/h, insulation 10 ~ 32h, after coming out of the stove, air cooling is to room temperature.
The further improvement of technique scheme of the present invention is: chemical constituent and the weight percentage thereof of described outer high-speed steel are: C 1.2% ~ 2.2%, Cr 3.0% ~ 4.5%, Ni 0.2% ~ 1.2%, Mo 3.5% ~ 5.0%, V 2.0% ~ 3.5%, W 1.0% ~ 2.5%, Nb 1.0% ~ 3.0%, Re 0.05% ~ 0.1%, P≤0.04%, S≤0.04%, Mn≤0.5%, Si 1.3% ~ 2.0%, and all the other are Fe; The smelting temperature of outer high speed molten steel is 1500 DEG C ~ 1650 DEG C; After melting, external floor height speed molten steel carries out Metamorphism treatment; Pouring temperature 1420 ~ 1480 DEG C, when body of roll model cavity temperature is down to 1220 ~ 1280 DEG C, stops centrifugal rotation;
Chemical constituent and the weight percentage thereof of described transition zone molten iron are: C 2.0% ~ 2.9%, Cr0.1% ~ 0.5%, Ni 0.2% ~ 0.8%, P≤0.01%, S≤0.04%, Mn 0.3 ~ 0.8%, Si 1.3% ~ 2.0%, and all the other are Fe; The smelting temperature of transition zone molten iron is 1500 DEG C ~ 1650 DEG C; After melting, spheroidization and inoculation process is carried out to transition zone molten iron; Pouring temperature 1400 ~ 1550 DEG C;
Chemical constituent and the weight percentage thereof of described core molten iron are: C 2.9% ~ 3.6%, Cr 0.1% ~ 0.5%, Ni 0.2% ~ 0.8%, P≤0.1%, S≤0.04%, Mn 0.3 ~ 0.8%, Si 1.3% ~ 2.0%, and all the other are Fe; The smelting temperature of core molten iron is 1500 DEG C ~ 1650 DEG C; After melting, spheroidization and inoculation process is carried out to core molten iron; Pouring temperature 1280 ~ 1400 DEG C.
The further optimization of technique scheme of the present invention is: the smelting temperature of outer high speed molten steel is 1600 DEG C ~ 1650 DEG C; The smelting temperature of transition zone molten iron and core molten iron is 1500 DEG C ~ 1550 DEG C.
The further improvement of technique scheme of the present invention is: it is carry out Metamorphism treatment by adding rare earth external floor height speed molten steel that described external floor height speed molten steel carries out Metamorphism treatment, rare earth addition is 0.2wt% ~ 6wt%, and Metamorphism treatment temperature is 1550 ~ 1650 DEG C; Described spheroidization and inoculation process carries out spheroidization and inoculation process by interpolation nodulizer and inovulant to transition zone molten iron and core molten iron, and spheroidization and inoculation treatment temperature is 1500 ~ 1600 DEG C; Described nodulizer is rare earth magnesium ferrosilicon alloy, and addition is 1.0wt% ~ 1.6wt%, described inovulant to be silicone content be 75% Antaciron, addition is 0.4wt% ~ 1.0wt%.
The further improvement of technique scheme of the present invention is: in described step B, and the centrifugal gravity multiple of centrifugal casting is 60 ~ 100G.
The further improvement of technique scheme of the present invention is: the fluence of watering of core molten iron is three times that transition zone molten iron waters fluence.
Owing to have employed technique scheme, the technological progress acquired by the present invention is:
The invention provides a kind of manufacture method of high-speed steel roll, significantly improve the bond strength of outer high-speed steel and core molten iron, bond strength was promoted to more than 500Mpa by former about 350Mpa, and high-speed steel roll body of roll binder course resistance to flaking is improved greatly; Simultaneously, the inventive method effectively can remove the outer field carbide former amount of core molten iron corrosion, thus improve roll neck tissue, improve the tensile strength of roll neck, the actual detection of roll neck tensile strength is at more than 550Mpa, three layers of more traditional composite roll 350Mpa are significantly increased, and have effectively stopped the roll breakage phenomenon in using.
The present invention, on the basis of centrifugal casting high speed molten steel, is first poured into transition zone molten iron, transition zone molten iron corrosion portion outer layer high-speed steel, and carbide formers a large amount of in the process enters into transition zone molten iron; And then the displacement completely of transition zone molten iron is realized by cast core molten iron, thus taken away the carbide former that can reduce roll pins having intensity and combination of inner and outside layer intensity, make final obtained high-speed steel roll, in its binder course and core molten iron, carbide former greatly reduces, and makes the carbide that only there is 3% amount that is less than in roll binder course and core tissue; Matrix is based on ferritic structure simultaneously, and the tensile strength of roll binder course intensity and roll neck improves all greatly.And the high-speed steel roll that produces of method of outer high-speed steel, intermediate layer spheroidal graphite cast-iron, three layers, core spheroidal graphite cast-iron is poured into a mould in existing employing successively, in its binder course and core, the content of carbide is about 7%, and only there is a small amount of ferritic structure in matrix, intensity is obviously lower.
The present invention carries out Metamorphism treatment to melted outer high speed molten steel, effectively can improve steel quality, refinement matrix and carbide, improves the anti-wear performance on high-speed steel roll surface; Spheroidization and inoculation process is carried out to melted transition zone molten iron and core molten iron, can roll strength be improved, make roll neck obtain good mechanical property, thus avoid roll breakage.
The present invention carries out the heat treatment mode of primary quenching+three tempering to high-speed steel roller stock, a large amount of unstable phase martensite is had paralympic in As-Cast Structure in High Speed Steels, can obtain stable matrix by above-mentioned heat treatment, and three temper can make retained austenite fully to be changed; By heat treatment, significantly can reduce the generation probability of roll fire check, significantly promote anti-accident ability, extend the life cycle of high-speed steel roll.
Accompanying drawing explanation
The schematic diagram of mo(u)ld-box that Fig. 1 is high-speed steel roll manufacture method of the present invention and uses;
Wherein, 1, rising head case, 2, emit eck mould type, 3, outer high-speed steel, 4, body of roll model, 5, end eck mould type, 6, under casing model, 7, overflow pipe, 8, overflow pipe sand mold, 9, fill the ladle of transition zone molten iron, 10 the ladle of core molten iron, is filled.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further details:
As shown in Figure 1, rising head case 1 is upright placement to reaction unit of the present invention, is provided with and emits eck mould type 2 in rising head case 1; Rising head case 1 bottom is body of roll model 4, and body of roll model 4 is metal mold model, and its surface spraying has release coating.Body of roll model 4 bottom is end eck mould type 5, and end eck mould type 5 is connected with the under casing model 6 rest on the ground.Offer expanding channels overflow pipe 7 under casing model 6, molten iron excessive in cast can be discharged through overflow pipe 7.Overflow pipe 7 is upright placement, and its inside is provided with overflow pipe sand mold 8.Described eck mould type 2, end eck mould type 5, under casing model 7 and the overflow pipe sand mold 8 of emitting all adopts quartz sand loam moulding.
The manufacture method of a kind of high-speed steel roll of the present invention, comprise adopting the outer high-speed steel of the casting method for centrifugal casting roll body of roll, then employing mould assembling pouring procedure cast core of the roll molten iron, adopting during mould assembling pouring procedure cast core of the roll molten iron is the body of roll model of good for cast outer high-speed steel and roll neck model, under casing are carried out mould assembling form mo(u)ld-box, connects overflow pipe bottom mo(u)ld-box; First in mo(u)ld-box, pour into a mould transition zone molten iron from the top cast gate of mo(u)ld-box, until transition zone molten iron fills up mo(u)ld-box, stops cast after overflow pipe flows out; Then in mo(u)ld-box, cast core molten iron is continued from the top cast gate of mo(u)ld-box, until transition zone molten iron is all ejected rear stopping cast by core molten iron.Specifically comprise following processing step:
A, melting raw material
Outer high-speed steel raw material, transition zone molten iron raw material and core molten iron raw material are carried out melting respectively in middle main frequency furnace; Transition zone molten iron and core molten iron are the spheroidal graphite cast-iron of heterogeneity;
(1) chemical constituent of described outer high-speed steel and weight percentage thereof are: C 1.2% ~ 2.2%, Cr 3.0% ~ 4.5%, Ni 0.2% ~ 1.2%, Mo 3.5% ~ 5.0%, V 2.0% ~ 3.5%, W 1.0% ~ 2.5%, Nb 1.0% ~ 3.0%, Re 0.05% ~ 0.1%, P≤0.04%, S≤0.04%, Mn≤0.5%, Si1.3% ~ 2.0%, and all the other are Fe; The smelting temperature of outer high speed molten steel is 1500 DEG C ~ 1650, preferably 1600 ~ 1650 DEG C;
Carry out Metamorphism treatment by adding rare earth external floor height speed molten steel after melting, rare earth addition is 0.2wt% ~ 6wt%, and Metamorphism treatment temperature is 1550 ~ 1650 DEG C.
(2) chemical constituent of described transition zone molten iron and weight percentage thereof are: C 2.0% ~ 2.9%, Cr 0.1% ~ 0.5%, Ni 0.2% ~ 0.8%, P≤0.01%, S≤0.04%, Mn 0.3 ~ 0.8%, Si 1.3% ~ 2.0%, and all the other are Fe; The smelting temperature of transition zone molten iron is 1500 DEG C ~ 1650 DEG C, preferably 1500 ~ 1550 DEG C;
Carry out spheroidization and inoculation process by interpolation nodulizer and inovulant to transition zone molten iron after melting, spheroidization and inoculation treatment temperature is 1500 ~ 1600 DEG C; Described nodulizer is rare earth magnesium ferrosilicon alloy, and addition is 1.0wt% ~ 1.6wt%, described inovulant to be silicone content be 75% Antaciron (being called for short 75% ferrosilicon), addition is 0.4wt% ~ 1.0wt%.
(3) chemical constituent of described core molten iron and weight percentage thereof are: C 2.9% ~ 3.6%, Cr0.1% ~ 0.5%, Ni 0.2% ~ 0.8%, P≤0.1%, S≤0.04%, Mn 0.3 ~ 0.8%, Si 1.3% ~ 2.0%, and all the other are Fe; The smelting temperature of core molten iron is 1500 DEG C ~ 1650 DEG C, preferably 1500 ~ 1550 DEG C;
Carry out spheroidization and inoculation process by interpolation nodulizer and inovulant to core molten iron after melting, spheroidization and inoculation treatment temperature is 1500 ~ 1600 DEG C; Described nodulizer is rare earth magnesium ferrosilicon alloy, and addition is 1.0wt% ~ 1.6wt%, and described inovulant is 75% ferrosilicon, and addition is 0.4wt% ~ 1.0wt%.
B, moulding by casting
Pour into a mould outer high speed molten steel, transition zone molten iron and core molten iron successively, casting process is:
(1) adopt centrifugal casting method, melted outer high speed molten steel is injected the body of roll model rotated, pouring temperature 1420 ~ 1480 DEG C, and the centrifugal gravity multiple of centrifugal casting is 60 ~ 100G; When body of roll model cavity temperature is down to 1220 ~ 1280 DEG C, stop centrifugal rotation;
(2) after high-speed steel water condensation, the body of roll model of good for cast outer high-speed steel and roll neck model, under casing are carried out mould assembling and forms mo(u)ld-box, bottom under casing, connect overflow pipe; Then in mo(u)ld-box, transition zone molten iron is poured into a mould by the cast gate of mo(u)ld-box, pouring temperature 1400 ~ 1550 DEG C; Until molten iron fills up mo(u)ld-box, stops cast after overflow pipe flows out;
(3) continue in mo(u)ld-box, to pour into a mould core molten iron, pouring temperature 1280 ~ 1400 DEG C by the cast gate of cast transition zone molten iron; Along with the injection of core molten iron, in mo(u)ld-box, original transition zone molten iron flows out gradually from overflow pipe, until transition zone molten iron stops cast after being all replaced into core molten iron; It is three times that transition zone molten iron waters fluence that the optimum of described core molten iron waters fluence.Be cooled to 200 DEG C ~ 320 DEG C after cast terminates, the demoulding of unpacking, obtains high-speed steel roller stock;
C, machining and heat treatment
Roller stock is carried out machining, by the working face car of high-speed steel roll to given size; After ultrasonic examination is up to the standards, roller stock is heat-treated, heat treatment detailed process is primary quenching+three tempering: quenching is warming up to 1000 ~ 1120 DEG C with the programming rate of 20 ~ 30 DEG C/h, insulation 3 ~ 4h, is cooled to 400 ~ 450 DEG C with the cooling rate of 130 ~ 140 DEG C/h after coming out of the stove.The front of three tempering is for twice be warming up to 500 ~ 550 DEG C with the programming rate of 20 ~ 30 DEG C/h, and insulation 10 ~ 32h, is cooled to room temperature with the cooling rate of 20 ~ 30 DEG C/h after coming out of the stove; Finally be warming up to 500 ~ 550 DEG C with the programming rate of 20 ~ 30 DEG C/h, insulation 10 ~ 32h, after coming out of the stove, air cooling is to room temperature, obtains high-speed steel roll.
Embodiment 1
A manufacture method for high-speed steel roll, comprises following processing step:
A, melting raw material
Outer high-speed steel raw material, transition zone spheroidal graphite cast-iron raw material and core spheroidal graphite cast-iron raw material are carried out melting respectively in middle main frequency furnace;
(1) chemical constituent of described outer high-speed steel and weight percentage thereof are: C2.0%, Cr4.0%, Ni0.8%, Mo4.2%, V3.0%, W1.9%, Nb2.0%, Re0.08%, P≤0.04%, S≤0.04%, Mn≤0.5%, Si1.5%, and all the other are Fe; The smelting temperature of outer high speed molten steel is 1600 DEG C ~ 1650 DEG C;
After melting, carry out Metamorphism treatment by adding rare earth external floor height speed molten steel, rare earth addition is 3wt%, and Metamorphism treatment temperature is 1600 ~ 1650 DEG C.
(2) chemical constituent of described transition zone spheroidal graphite cast-iron and weight percentage thereof are: C 2.5%, Cr0.3%, Ni 0.5%, P≤0.01%, S≤0.04%, Mn 0.5%, Si 1.8%, and all the other are Fe; The smelting temperature of transition zone spheroidal graphite cast-iron is 1500 DEG C ~ 1550 DEG C;
After melting, carry out spheroidization and inoculation process by interpolation rare earth magnesium ferrosilicon alloy and 75% ferrosilicon to transition zone molten iron, spheroidization and inoculation treatment temperature is 1500 ~ 1550 DEG C; The addition of nodulizer rare earth magnesium ferrosilicon alloy is 1.4wt%, and the addition of described 75% ferrosilicon is 0.6wt%.
(3) chemical constituent of described core spheroidal graphite cast-iron and weight percentage thereof are: C 3.2%, Cr 0.3%, Ni 0.4%, P≤0.1%, S≤0.04%, Mn 0.5%, Si 1.5%, and all the other are Fe; The smelting temperature of core spheroidal graphite cast-iron is 1500 DEG C ~ 1650 DEG C;
After melting, carry out spheroidization and inoculation process by interpolation rare earth magnesium ferrosilicon alloy and 75% ferrosilicon to core molten iron, spheroidization and inoculation treatment temperature is 1500 ~ 1550 DEG C; The addition of described nodulizer rare earth magnesium ferrosilicon alloy is 1.2wt%, and the addition of described 75% ferrosilicon is 0.5wt%.
B, moulding by casting
Pour into a mould outer high speed molten steel, transition zone molten iron and core molten iron successively, cast detailed process is:
(1) fluence is watered according to the working lining THICKNESS CALCULATION of user's work roll cooling layer high-speed steel of going out, adopt centrifugal casting method, be poured in the body of roll model of rotation by melted outer high speed molten steel, pouring temperature 1420 ~ 1480 DEG C, the centrifugal gravity multiple of centrifugal casting is 80G; When body of roll model cavity temperature is down to 1250 DEG C, stop centrifugal casting;
(2) after high-speed steel water condensation, the body of roll model of good for cast outer high-speed steel and roll neck model, under casing model are carried out mould assembling, and under casing model bottom connects overflow pipe; Then by the cast gate cast transition zone molten iron of mo(u)ld-box, pouring temperature 1450 ~ 1520 DEG C; Until molten iron fills up mo(u)ld-box, stops cast after overflow pipe flows out;
(3) cast gate to cast transition zone molten iron continues cast core molten iron, and the fluence of watering of core molten iron is three times that transition zone molten iron waters fluence, pouring temperature 1350 ~ 1400 DEG C; Along with the injection of core molten iron, the transition zone molten iron originally filled in mo(u)ld-box flows out, until transition zone molten iron is all replaced into core molten iron from overflow pipe gradually; After cast terminates, mo(u)ld-box normal temperature is cooled to 200 DEG C ~ 320 DEG C, the demoulding of unpacking, obtains high-speed steel roller stock.
C, machining and heat treatment
By machining by the working face car of high-speed steel roller stock to given size; After ultrasonic examination is up to the standards, heat-treat roller stock, heat treatment detailed process is primary quenching+three tempering: quenching is warming up to 1100 DEG C with the programming rate of 25 DEG C/h, and insulation 4h, is cooled to 450 DEG C with the cooling rate of 130 DEG C/h after coming out of the stove;
The front of three tempering is for twice be warming up to 520 DEG C with the programming rate of 25 DEG C/h, and insulation 20h, is cooled to room temperature with the cooling rate of 25 DEG C/h after coming out of the stove; Finally be warming up to 550 DEG C with the programming rate of 25 DEG C/h, insulation 15h, after coming out of the stove, air cooling is to room temperature, obtains high-speed steel roll.
Embodiment 2
Preparation process is substantially the same manner as Example 1, and its difference is: in described step B, and the pouring temperature of transition zone molten iron is 1480 ~ 1500 DEG C.
Embodiment 3
Preparation process is substantially the same manner as Example 1, and its difference is: in the heat treatment step of described step C, and quenching is warming up to 1050 DEG C with the programming rate of 30 DEG C/h, and insulation 3.5h, is cooled to 420 DEG C with the cooling rate of 140 DEG C/h after coming out of the stove; Then double tempering is warming up to 550 DEG C with the programming rate of 30 DEG C/h, and insulation 30h, is cooled to room temperature with the cooling rate of 20 DEG C/h after coming out of the stove; A last tempering is warming up to 520 DEG C with the programming rate of 30 DEG C/h, and insulation 12h, after coming out of the stove, air cooling is to room temperature, obtains high-speed steel roll.
Embodiment 4
Preparation process is substantially the same manner as Example 1, and its difference is: during described step B centrifugal casting skin high-speed steel, when body of roll model cavity temperature is down to 1230 DEG C, stop centrifugal casting.
Embodiment 5
Preparation process is substantially the same manner as Example 1, and its difference is: in described step B, and the pouring temperature of core molten iron is 1330 ~ 1380 DEG C.
Embodiment 6
The present embodiment is comparative example, adopts three layers of composite casting legal system for high-speed steel roll.
In the present embodiment, the chemical constituent content of raw materials used outer high-speed steel, transition zone spheroidal graphite cast-iron, core spheroidal graphite cast-iron and method of smelting are all with embodiment 1.During cast, first the outer high speed molten steel of centrifugal casting, after being poured when die cavity temperature reaches 1350 DEG C, centrifuge inserts transition zone molten iron in die cavity, slow cooling after centrifugal casting, the centrifuge stall when die cavity temperature reaches 1040 DEG C.Then body of roll model and under casing model, rising head case etc. are carried out mould assembling, from the cast gate cast core molten iron of rising head box top, pouring temperature is 1420 DEG C; Fill up after mo(u)ld-box until core molten iron and stop cast.Mo(u)ld-box normal temperature is cooled to 200 DEG C ~ 320 DEG C, the demoulding of unpacking, obtains high-speed steel roller stock.Then according to the method for embodiment 1, machining and heat treatment are carried out to high-speed steel roller stock, obtain high-speed steel roll.
Example 1 ~ embodiment 6 product carries out the detection of sample tensile mechanical properties, and Performance Detection performs national standard GB/T1503-2008.Testing result is in table 1.
Table 1 embodiment product tensile mechanical properties testing result
Can be found out by data in table 1, adopt high-speed steel roll prepared by the inventive method, the radial tensile strength of its binder course axial tensile-strength, binder course and roll neck tensile strength are all significantly higher than three layers of composite high-speed steel roller of embodiment 6, the resistance to flaking of high-speed steel roll body of roll binder course improves greatly, and effectively can stop the roll breakage phenomenon that roll in use occurs, the life-span of roll extends greatly.
Claims (8)
1. the manufacture method of a high-speed steel roll, comprise and adopt the outer high-speed steel of the casting method for centrifugal casting roll body of roll, then employing mould assembling pouring procedure cast core of the roll molten iron, it is characterized in that: adopting during mould assembling pouring procedure cast core of the roll molten iron is the body of roll model of good for cast outer high-speed steel and roll neck model, under casing are carried out mould assembling form mo(u)ld-box, connects overflow pipe bottom mo(u)ld-box; First in mo(u)ld-box, pour into a mould transition zone molten iron from the top cast gate of mo(u)ld-box, until transition zone molten iron fills up mo(u)ld-box, stops cast after overflow pipe flows out; Then in mo(u)ld-box, cast core molten iron is continued from the top cast gate of mo(u)ld-box, until transition zone molten iron is all ejected rear stopping cast by core molten iron.
2. the manufacture method of a kind of high-speed steel roll according to claim 1, is characterized in that: specifically comprise following processing step:
A, melting raw material
Outer high-speed steel raw material, transition zone molten iron raw material and core molten iron raw material are carried out melting respectively;
B, moulding by casting
Pour into a mould outer high speed molten steel, transition zone molten iron and core molten iron successively, casting process is:
(1) adopt centrifugal casting method, melted outer high speed molten steel is injected the body of roll model rotated;
(2) after high-speed steel water condensation, the body of roll model of good for cast outer high-speed steel and roll neck model, under casing are carried out mould assembling and forms mo(u)ld-box, bottom under casing, connect overflow pipe; Then by mo(u)ld-box cast gate cast transition zone molten iron; Until transition zone molten iron fills up mo(u)ld-box, flows out from overflow pipe;
(3) cast core molten iron is continued by mo(u)ld-box cast gate, along with the injection of core molten iron, in mo(u)ld-box, original transition zone molten iron flows out gradually from overflow pipe, until transition zone molten iron stops cast after being all replaced into core molten iron, then 200 DEG C ~ 320 DEG C are cooled to, the unpacking demoulding, obtains high-speed steel roller stock;
C, machining and heat treatment
Roller stock is carried out machining, by the working face car of high-speed steel roll to given size; After ultrasonic examination is up to the standards, roller stock is heat-treated, be then cooled to room temperature, obtain high-speed steel roll.
3. the manufacture method of a kind of high-speed steel roll according to claim 2, it is characterized in that: the heat treatment detailed process of described step C is primary quenching+three tempering: quenching is warming up to 1000 ~ 1120 DEG C with the programming rate of 20 ~ 30 DEG C/h, insulation 3 ~ 4h, is cooled to 400 ~ 450 DEG C with the cooling rate of 130 ~ 140 DEG C/h after coming out of the stove;
The front of three tempering is for twice be warming up to 500 ~ 550 DEG C with the programming rate of 20 ~ 30 DEG C/h, and insulation 10 ~ 32h, is cooled to room temperature with the cooling rate of 20 ~ 30 DEG C/h after coming out of the stove; Finally be warming up to 500 ~ 550 DEG C with the programming rate of 20 ~ 30 DEG C/h, insulation 10 ~ 32h, after coming out of the stove, air cooling is to room temperature.
4. the manufacture method of a kind of high-speed steel roll according to claim 2, it is characterized in that: chemical constituent and the weight percentage thereof of described outer high-speed steel are: C 1.2% ~ 2.2%, Cr 3.0% ~ 4.5%, Ni 0.2% ~ 1.2%, Mo 3.5% ~ 5.0%, V 2.0% ~ 3.5%, W 1.0% ~ 2.5%, Nb 1.0% ~ 3.0%, Re 0.05% ~ 0.1%, P≤0.04%, S≤0.04%, Mn≤0.5%, Si 1.3% ~ 2.0%, and all the other are Fe; The smelting temperature of outer high speed molten steel is 1500 DEG C ~ 1650 DEG C; After melting, external floor height speed molten steel carries out Metamorphism treatment; Pouring temperature 1420 ~ 1480 DEG C, when body of roll model cavity temperature is down to 1220 ~ 1280 DEG C, stops centrifugal rotation;
Chemical constituent and the weight percentage thereof of described transition zone molten iron are: C 2.0% ~ 2.9%, Cr0.1% ~ 0.5%, Ni 0.2% ~ 0.8%, P≤0.01%, S≤0.04%, Mn 0.3 ~ 0.8%, Si 1.3% ~ 2.0%, and all the other are Fe; The smelting temperature of transition zone molten iron is 1500 DEG C ~ 1650 DEG C; After melting, spheroidization and inoculation process is carried out to transition zone molten iron; Pouring temperature 1400 ~ 1550 DEG C;
Chemical constituent and the weight percentage thereof of described core molten iron are: C 2.9% ~ 3.6%, Cr 0.1% ~ 0.5%, Ni 0.2% ~ 0.8%, P≤0.1%, S≤0.04%, Mn 0.3 ~ 0.8%, Si 1.3% ~ 2.0%, and all the other are Fe; The smelting temperature of core molten iron is 1500 DEG C ~ 1650 DEG C; After melting, spheroidization and inoculation process is carried out to core molten iron; Pouring temperature 1280 ~ 1400 DEG C.
5. the manufacture method of a kind of high-speed steel roll according to claim 4, is characterized in that: the smelting temperature of outer high speed molten steel is 1600 DEG C ~ 1650 DEG C; The smelting temperature of transition zone molten iron and core molten iron is 1500 DEG C ~ 1550 DEG C.
6. the manufacture method of a kind of high-speed steel roll according to claim 4, it is characterized in that: it is carry out Metamorphism treatment by adding rare earth external floor height speed molten steel that described external floor height speed molten steel carries out Metamorphism treatment, rare earth addition is 0.2wt% ~ 6wt%, and Metamorphism treatment temperature is 1550 ~ 1650 DEG C; Described spheroidization and inoculation process carries out spheroidization and inoculation process by interpolation nodulizer and inovulant to transition zone molten iron and core molten iron, and spheroidization and inoculation treatment temperature is 1500 ~ 1600 DEG C; Described nodulizer is rare earth magnesium ferrosilicon alloy, and addition is 1.0wt% ~ 1.6wt%, described inovulant to be silicone content be 75% Antaciron, addition is 0.4wt% ~ 1.0wt%.
7. the manufacture method of a kind of high-speed steel roll according to claim 2, is characterized in that: in described step B, and the centrifugal gravity multiple of centrifugal casting is 60 ~ 100G.
8. the manufacture method of a kind of high-speed steel roll according to any one of claims 1 or 2, is characterized in that: the fluence of watering of core molten iron is three times that transition zone molten iron waters fluence.
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| CN112139471B (en) * | 2020-09-24 | 2022-04-08 | 邢台鸿科高速钢轧辊有限公司 | Casting box of roller for bar wire and medium-width strip steel rolling mill and using method |
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