CN105618485A - Composite particle reinforced roller of hot-rolling seamless steel pipe sizing mill or reducing mill and preparation method thereof - Google Patents
Composite particle reinforced roller of hot-rolling seamless steel pipe sizing mill or reducing mill and preparation method thereof Download PDFInfo
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- CN105618485A CN105618485A CN201610066569.7A CN201610066569A CN105618485A CN 105618485 A CN105618485 A CN 105618485A CN 201610066569 A CN201610066569 A CN 201610066569A CN 105618485 A CN105618485 A CN 105618485A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- Crystallography & Structural Chemistry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention discloses a composite particle reinforced roller of a hot-rolling seamless steel pipe sizing mill or reducing mill and a preparation method thereof. Composite particles are composed of hardening particles, active wetting agents and matrix reinforcing agents. The composite particle reinforced roller of the sizing mill or reducing mill is cast after nodular cast iron matrix molten metal is reinforced; and the high-strength and high-toughness composite particle reinforced roller is obtained by conducting isothermal quenching and machining on the roller. The composite particle reinforced roller is resistant to abrasion and impact; the service life of the roller is prolonged by over two times; the production cost is lowered; the production efficiency of a steel pipe production enterprise is improved, and economic benefits of the steel pipe production enterprise are increased.
Description
Technical field
The present invention relates to roll manufacturing technology field, particularly relate to a kind of heat rolling seamless steel pipe sizing mill or reducing mill compound particle strengthening roll and preparation method thereof.
Background technology
China is the first in the world steel pipe's production big country, and yield accounts for the 1/2 of Gross World Product. The sizing of steel pipe and tube reducing be last during hot rolled seamless steel tube produces together with hollow forging thermal deformation operation. Its Main Function is to eliminate the hollow forging external diameter caused in the preceding working procedure operation of rolling to differ, to improve outer-diameter accuracy and the circularity being rolled into QC. The multi-frame continuous rolling process that seamless steel pipe is fixed, tube reducing process is steel pipe not cored bar.
Sizing is that steel pipe rolls into have certain requirements dimensional accuracy and out of roundness under less total reducing rate and little single chassis reducing rate, and improves the surface quality of steel pipe further. The work housing number of sizing mill is generally 5��14 framves, and total reducing rate is 3%��35%, and the form of sizing mill is divided into two rollers, three rollers, four-roller type sizing mill by roller number. Tube reducing, except the effect having sizing, also requires that reducing rate is relatively big, to realize big materials in the tube production small-caliber steel pipe. Reducing mill is usually two rollers or three-roller type axial rolling tandem mill, is generally more than 3��14 frames. Calmly, the finishing steel pipe sizes after tube reducing no longer changes. Seamless steel pipe is fixed, the specification kind of tube reducing roll is a lot, little of tens kilograms every, greatly to every up to 2.5 tons.
Seamless steel pipe is fixed, tube reducing roll is operated in the high temperature of 800��980 DEG C and cools down under water chilling action, is subject to the tangential combined stress stretched with radial compression, and bears alternating thermal stress effect simultaneously. Produce between roll working surface and steel pipe to roll and sliding friction, particularly wear and tear under stretch reducing very serious. Therefore it is required that fixed, tube reducing roll has high intensity, high tenacity and good wearability, thermal fatigue resistance. The degree of wear fixed, tube reducing roll being controlled very strict by actual production, being necessary for repairing once exceed requirement, to meet the needs of hot rolled seamless steel tube rolling with negative tolerance. General 1-2 order of classes or grades at school just needs more transducer set roll. Owing in use needing through repeatedly repairing loaded vehicle, it is desirable to roller surface to have thicker working lining, need to machine away 50% under normal circumstances even more. Therefore, also require that fixed, tube reducing roll has good cold-forming property.
The material that fixed, reducing mill roll commonly uses in actual applications at present is alloy nodular cast iron and chilled cast iron two kinds. Its Problems existing and deficiency are, owing to containing the carbide-forming elements such as Cr, Mo, as cast condition spheroidization of graphite weak effect in alloy nodular cast iron. Add isothermal hardening difficulty big, therefore, generally individually employing normalizing heat treatment, and make overall performance decline, tensile strength only has 450MPa, and impact flexibility only has 3J/cm2. In use, after repairing particularly in processing, it is easily generated cracking, not only needs to shut down roller, and easily cause waste product. Simultaneously as be 3% containing Ni, be 1% containing Mo, production cost and use cost are all higher. And owing to the low formation carbide amount of alloy content is few in chilled cast iron, wear no resistance, be generally the 50% of alloy nodular cast iron service life, after processing is repaired, hardness easily reduces and produces " steel bonding " phenomenon and cause waste product. Although the production cost of chilled cast iron and use cost are all relatively low, but cost performance is also very poor. Thus, the substantial amounts of energy, labour force and metal material are not only wasted in frequent replacing fixed, reducing mill roll, but also need to prepare that substantial amounts of installation is fixed, auxiliary framework used by tube reducing roll.
Summary of the invention
The present invention provides a kind of heat rolling seamless steel pipe sizing mill or reducing mill compound particle strengthening roll and preparation method thereof, to solve existing heat rolling seamless steel pipe sizing mill or the problems of reducing mill roll existence. Technical scheme is as follows.
One aspect of the present invention provides a kind of heat rolling seamless steel pipe sizing mill compound particle strengthening roll, it is characterized in that sizing mill compound particle strengthening roll adopts compound particle strengthened ductile cast iron matrix, described compound particle is by enhanced particles, active wetting agents and matrix strengthening agent composition; Described enhanced particles: active wetting agents: matrix strengthening agent=1:1:0.001��0.002; Described enhanced particles is at least one of tungsten carbide, titanium carbide and boron carbide, is the 5��10% of ductile cast iron casting gross weight; Described active wetting agents is Ni powder, at least one of Nb powder and industrial reduction iron powder; Described matrix strengthening agent is bismuth meal and antimony powder or one therein.
Another aspect of the present invention provides a kind of hot rolled seamless steel tube reducing mill compound particle strengthening roll, it is characterized in that described reducing mill compound particle strengthening roll adopts compound particle strengthened ductile cast iron matrix, described compound particle is by enhanced particles, active wetting agents and matrix strengthening agent composition; Described enhanced particles: active wetting agents: matrix strengthening agent=1:1:0.001��0.002; Described enhanced particles is at least one of tungsten carbide, titanium carbide and boron carbide, is the 5��10% of ductile cast iron casting female's gross weight; Described active wetting agents is Ni powder, at least one of Nb powder and industrial reduction iron powder; Described matrix strengthening agent is bismuth meal and antimony powder or one therein.
It is another aspect of the present invention to provide a kind of heat rolling seamless steel pipe sizing mill or the preparation method of reducing mill compound particle strengthening roll, the feature of the method is, described sizing mill or reducing mill compound particle strengthening roll adopt compound particle strengthened ductile cast iron matrix, described compound particle is by enhanced particles, active wetting agents and matrix strengthening agent composition; Its preparation method is as follows:
A) material design: adopt the described compound particle strengthened ductile cast iron matrix composition to be: C:3.4��3:8%, Si:1.8��2.2%, Mn :��0.35%, P :��0.03%, S :��0.025%;
Described enhanced particles is the 5��10% of ductile cast iron casting gross weight; Described enhanced particles is at least one of tungsten carbide, titanium carbide and boron carbide; Described active wetting agents is Ni powder, at least one of Nb powder and industrial reduction iron powder; Described matrix strengthening agent is bismuth meal and antimony powder or one therein; By described enhanced particles, active wetting agents, matrix strengthening agent is mixed and made into the complex intensifying particle block of 5��10mm by the ratio uniform of 1:1:0.001��0.002, and is preheated to 350��400 DEG C; Wherein, adopting described enhanced particles tungsten carbide when simultaneously, when titanium carbide and boron carbide, its ratio is 1:1:1.
B) smelt, casting designs: carry out the smelting of spheroidal graphite cast-iron matrix metal bath; After smelting completes, ladle first puts into the complex intensifying particle block being preheated to 350��400 DEG C, then pour into parent metal melt and strengthen, then pour into casting mold and carry out the casting of roll and breeding and nodularization of spheroidal graphite cast-iron;
C) heat treatment design: the compound particle strengthening roll cast is carried out isothermal hardening, obtains lower bainite tissue;
D) roll is carried out machining, obtain required crudy.
The spheroidal graphite cast-iron matrix composition of heat rolling seamless steel pipe sizing mill of the present invention or reducing mill compound particle strengthening roll is: C:3.4��3:8%, Si:1.8��2.2%, Mn :��0.35%, P :��0.03%, S :��0.025%. The present invention also according to circumstances can add Cu:0.2��0.4% in spheroidal graphite cast-iron matrix composition, and Ni:0��0.5%, Mg:0.04��0.06%, Nb:0.01��0.1% is to carry out the adjustment of roller substrate performance. Tensile strength sigma b >=800MPa, the impact flexibility �� k >=90J/cm of compound particle of the present invention strengthening roll2��
The heat rolling seamless steel pipe sizing mill of the present invention or reducing mill compound particle strengthening roll add the intensified elements such as enhanced particles, active wetting agents, matrix strengthening agent, the complex intensifying particle block formed not with spheroidal graphite cast-iron matrix generation chemical reaction, it is thus achieved that good nodularization effect. Especially the nodularization effect of thick strip and super thick strip roll significantly improves, thus ensure that sizing mill and the castability of reducing mill roll, the comprehensive mechanical property making sizing mill and reducing mill roll significantly improves, wear and shock-resistant performance is greatly improved, improve the service life of roll, significantly reduce manufacture and production cost.
Accompanying drawing explanation
Fig. 1 is that hot rolled seamless steel tube dual roll type is fixed, the schematic diagram of tube reducing roll, the position signal of pass curve when wherein the dotted line of sequence number 1 is to scrap after repairing loaded vehicle.
Fig. 2 is that hot rolled seamless steel tube three-roller type is fixed, the schematic diagram of tube reducing roll. The position signal of pass curve when wherein the dotted line of sequence number 2 is to scrap after repairing loaded vehicle.
Detailed description of the invention
Referring to the design philosophy of the present invention, the present invention is also described in detail as follows by exemplary embodiment in conjunction with accompanying drawing.
The present invention adopts creationary design philosophy, exemplary embodiment and concrete product accompanying drawing, by complete technical scheme, it is provided that a kind of heat rolling seamless steel pipe sizing mill or reducing mill compound particle strengthen roll and the method preparing this product thereof. This product and method adopt the complex intensifying particle being made up of enhanced particles, active wetting agents, matrix strengthening agent, join and spheroidal graphite cast-iron matrix carries out product casting, isothermal hardening is carried out again through to this cast article, obtain the compound particle strengthening austempering ductile iron roll improved through strengthening and performance, for sizing mill or the reducing mill of hot rolled seamless steel tube.
The spheroidal graphite cast-iron matrix composition that heat rolling seamless steel pipe sizing mill of the present invention or reducing mill compound particle strengthening roll and preparation method thereof adopt is: C:3.4��3:8%, Si:1.8��2.2%, Mn :��0.35%, P :��0.03%, S :��0.025%; Also according to circumstances can add Cu:0.2��0.4%, Ni:0��0.5%, Mg:0.04��0.06% and Nb:0.01��0.1% in spheroidal graphite cast-iron matrix composition, to carry out the adjustment of roller substrate performance.
Wherein, the carbon in matrix composition should select rationally, and carbon such as height is then easily generated graphite floatation or chunky graphite, and the low tendency of then shrinking of carbon strengthens. The present invention have selected rational 3.4��3.8%. Prove that this content is suitable by using. Element silicon in roll component such as height is then easily formed abnormal graphite, makes black brittleness improve. Therefore, this composition is advisable with 1.8��2.2 through experimental selection element silicon. Because manganese element has significant segregation tendency, the uneven of Graphite Distribution can be caused. Therefore, this composition strictly controls manganese element below 0.4%. And phosphorus, element sulphur are crossed and are easily produced at most to be mingled with and make decaying spheroidisation, should be more low more good. This composition have employed P :��0.03%, S :��0.025%. Composition also adds the element such as nickel and copper in right amount, to improve the quenching degree of spheroidal graphite cast-iron, strengthens the mechanical property of its matrix.
In preparation process, the present invention adopts complex intensifying particle: active wetting agents: the ratio of matrix strengthening agent=1:1:0.001��0.002 is pressed into the complex intensifying particle block of 5��10mm, and be preheated to 350��400 DEG C stand-by. The selected enhanced particles added is tungsten carbide, titanium carbide and boron carbide or at least one therein; Wherein, titanium carbide has the feature of high rigidity, corrosion-resistant, Heat stability is good; Tungsten carbide has the characteristic of ultra-hard abrasive material; And boron carbide is one of known hard material. Enhanced particles is the 5��10% of ductile cast iron casting gross weight. Active wetting agents is Ni powder, Nb powder and industrial reduction iron powder or at least one therein; Matrix strengthening agent is bismuth meal and antimony powder or one therein. Wherein, ratio should equalization when two or more for active wetting agents. When adopting enhanced particles tungsten carbide, titanium carbide and boron carbide simultaneously, its ratio preferentially adopts 1:1:1, it is possible to according to real needs adjustment.
Owing to matrix composition being substantially free of tension-active element, Mn manganese element content is strict controlled in again less than 0.4%, again plus the effect of matrix strengthening agent in compound particle block, the tungsten carbide added, titanium carbide or boron carbide etc. not with matrix generation chemical reaction, therefore can obtain good nodularization effect, especially the nodularization effect of thick strip and super thick strip significantly improves, thus ensure that castability fixed, reducing mill roll base, lay the foundation for obtaining high-performance roll.
The present invention is by affiliated tungsten carbide, the enhanced particles such as titanium carbide and boron carbide, active wetting agents Ni powder, Nb powder and industrial reduction iron powder, the materials such as matrix strengthening agent bismuth meal and antimony powder, the ratio adopting 1:1:0.001��0.002 stirs in ball mill, is pressed into the complex intensifying particle block of 5��10mm. When carrying out the smelting of spheroidal graphite cast-iron matrix metal bath, ladle to be poured into is placed in advance in being preheated to the complex intensifying particle block of 350��400 DEG C, after parent metal melt has been smelted, in ladle, pour into parent metal melt again strengthen, then carrying out the casting of spheroidal graphite roll, breeding needed for spheroidal graphite cast-iron carries out routinely with nodularization.
The compound particle strengthening roll cast, after the same temperature hardening heat treatment having carried out routine, obtains lower bainite tissue. The tensile strength making compound particle strengthening roll reaches �� b >=800MPa, and impact flexibility reaches �� k >=90J/cm2, the combination property of roll product is greatly improved. 450MPa, impact flexibility is only had to only have 3J/cm with tensile strength2Existing spheroidal graphite roll define obvious contrast, obtain after machining required quality compound particle strengthening roll.
The present invention adopts compound particle strengthening and same temperature hardening heat treatment technique, makes the spheroidal graphite cast-iron matrix of sizing mill or reducing mill roll obtain good intensity and toughness, and roll has the dynamic mechanical more more excellent than forged steel, cast steel and micro alloyed steel. Simultaneously because its density is little, about lighter by 10% than the casting of same volume, forged steel pieces, generally the least expensive material is become because its cost is low. The application on sizing mill for seamless steel pipes and reducing mill roll of the current austempering ductile iron is little. Its main cause is the service condition requirement that the wearability of current sizing mill and reducing mill roll and thermal fatigue resistance are not met by the frequent alternating hot and cold thermal stress of roll. But the present invention is by adding complex intensifying particle element and by rationally effective preparation technology, makes austempering ductile iron application on sizing mill for seamless steel pipes and reducing mill roll accomplished. The sizing mill of the present invention and the mechanical property of reducing mill roll are good, and wear and shock-resistant can keep high service life and good cold-forming property.
Embodiment 1
With reference to accompanying drawing 1, the present embodiment is for manufacturing �� 460 hot rolled seamless steel tube unit dual roll type sizing mill or reducing mill compound particle strengthening roll. Weight 898kg.
The ratio of the complex intensifying particle element of the present embodiment roll adopts: TiC22.5kg, WC22.5kg, Ni powder 5kg, Nb powder 5kg, iron powder 35kg, bismuth meal 0.03kg, antimony powder 0.015kg. Above-mentioned element stirs 2 hours in ball mill, and the complex intensifying particle block being pressed into 5��10mm after mix homogeneously is stand-by.
The composition of spheroidal graphite cast-iron matrix adopts: C:3.4%, Si:1.8%, Mn:0.30%, P:0.017%, S:0.014%, Cu:0.40%, Mg:0.06%.
Conventional nodular cast iron smelting parent metal melt, after smelting completes, ladle is first put into the complex intensifying particle block being preheating to 350��400 DEG C, again parent metal melt is poured in ladle, parent metal melt is made to be strengthened, then the metal bath of strengthening being poured into roll casting mold to cast, the spheroidal graphite cast-iron simultaneously carrying out routine breeds and nodularization.
The roll base cast is through roughing, through conventional isothermal hardening, then carries out polish and obtains finished product. The inspection hardness of roll product has reached the 69HSD required, tensile strength reaches 800MPa, and impact flexibility reaches 92J/cm2. This roll is through repeatedly repairing loaded vehicle, and radial direction machines away 25mm and remains at hardness 69HSD, and spheroidal graphite cast-iron is disposable rolls 6000 steel pipes, and service life improves more than 2 times than former chilled cast iron roll, it does not have ftracture, the phenomenon such as steel bonding. The position signal of pass curve when scrapping after repairing loaded vehicle referring to dotted line in Fig. 11.
Embodiment 2
With reference to accompanying drawing 2, the present embodiment is for manufacturing �� 250 hot rolled seamless steel tube unit three-roller type sizing mill or reducing mill roll compound particle strengthening roll, weight 242kg.
The ratio of the complex intensifying particle element of this roll adopts: TiC8kg, WC8kg, B4C8kg, Ni powder 2kg, Nb powder 2kg, industrial reduction iron powder 20kg, bismuth meal 0.03kg, antimony powder 0.018kg. Above-mentioned element stirs in ball mill 2 hours and makes its mix homogeneously, is pressed into the complex intensifying particle block of 5��10mm, and be preheated to 350��400 DEG C stand-by; Spheroidal graphite cast-iron matrix chemical composition adopts: C:3.6%, Si:2.1%, Mn:0.32%, P:0.017%, S:0.014%, Cu:0.25%, Mg:0.05%.
Carry out the smelting of the spheroidal graphite cast-iron matrix metal bath of routine afterwards. After smelting completes, casting ladle puts into the complex intensifying particle block being preheated to 350��400 DEG C, then pour into parent metal melt and carry out the strengthening of melt, then pour into casting pattern and carry out the casting of roll, carry out breeding and nodularization of spheroidal graphite cast-iron routinely.
The roll product base cast is carrying out the isothermal hardening of routine after roughing, carries out polish afterwards and obtains finished product. Through inspection, the hardness of roll product has reached the 70HSD required, tensile strength reaches 810MPa, and impact flexibility reaches 90J/cm2. This roll is through repeatedly repairing until radial direction remains at 68��70HSD after machining away 70mm. The position signal of pass curve when scrapping after repairing loaded vehicle referring to dotted line in Fig. 21.
The roll wear and shock-resistant of the present embodiment, maintains good cold-forming property in repeatedly repairing, improves the service life of roll. Disposable rolling 9000 steel pipes, service life is more than 2 times of the domestic alloy nodular cast iron sizing mill roll containing Ni3, Mo1, and do not ftracture, the problem such as steel bonding.
The above embodiment of the present invention is already with large-scale steel pipe manufacturing enterprise at home, and prove through using, its mechanical performance all improves a lot than existing roll, raising due to roll campaign, make in production process because the frequency of reparation loaded vehicle and roll change is greatly lowered, thus also greatly reducing production cost, improve production efficiency and the economic benefit of steel pipe's production enterprise.
The invention is not restricted to above-described embodiment, in the scope without departing from design philosophy of the present invention, it is possible to carry out various changes and modifications, these changes belong to protection scope of the present invention.
Claims (10)
1. a heat rolling seamless steel pipe sizing mill compound particle strengthening roll, it is characterised in that described sizing mill compound particle strengthening roll adopts compound particle strengthened ductile cast iron matrix, described compound particle is by enhanced particles, active wetting agents and matrix strengthening agent composition; Described enhanced particles: active wetting agents: matrix strengthening agent=1:1:0.001��0.002; Described enhanced particles is at least one of tungsten carbide, titanium carbide and boron carbide, and enhanced particles is the 5��10% of ductile cast iron casting gross weight; Described active wetting agents is Ni powder, at least one of Nb powder and industrial reduction iron powder; Described matrix strengthening agent is bismuth meal and antimony powder or one therein.
2. sizing mill compound particle strengthens roll according to claim 1, it is characterised in that the composition of described compound particle strengthened ductile cast iron matrix is: C:3.4��3:8%, Si:1.8��2.2%, Mn :��0.35%, P :��0.03%, S :��0.025%.
3. a hot rolled seamless steel tube reducing mill compound particle strengthening roll, it is characterised in that described reducing mill compound particle strengthening roll adopts compound particle strengthened ductile cast iron matrix, described compound particle is by enhanced particles, active wetting agents and matrix strengthening agent composition; Described enhanced particles: active wetting agents: matrix strengthening agent=1:1:0.001��0.002; Described enhanced particles is at least one of tungsten carbide, titanium carbide and boron carbide, and enhanced particles is the 5��10% of ductile cast iron casting gross weight; Described active wetting agents is at least one of Ni powder, Nb powder and industrial reduction iron powder; Described matrix strengthening agent is bismuth meal and antimony powder or one therein.
4. reducing mill compound particle strengthens roll according to claim 3, it is characterised in that the composition of described compound particle strengthened ductile cast iron matrix is: C:3.4��3:8%, Si:1.8��2.2%, Mn :��0.35%, P :��0.03%, S :��0.025%.
5. sizing mill or reducing mill compound particle strengthening roll according to claim 2 or 4, it is characterized in that, the composition of described compound particle strengthened ductile cast iron matrix is added with Cu:0.2��0.4%, Ni:0��0.5%, Mg:0.04��0.06%, Nb:0.01��0.1%.
6. sizing mill or reducing mill compound particle strengthening roll according to claim 1 or 3, it is characterised in that tensile strength sigma b >=800MPa, the impact flexibility �� k >=90J/cm of compound particle strengthening roll2��
7. the preparation method of a heat rolling seamless steel pipe sizing mill or reducing mill compound particle strengthening roll, it is characterized in that, described compound particle strengthening roll adopts compound particle strengthened ductile cast iron matrix, and described compound particle is by enhanced particles, active wetting agents and matrix strengthening agent composition; Its preparation method is as follows:
A) material design: the composition adopting described compound particle strengthened ductile cast iron matrix is: C:3.4��3:8%, Si:1.8��2.2%, Mn :��0.35%, P :��0.03%, S :��0.025%;
Described enhanced particles is the 5��10% of ductile cast iron casting gross weight, and described enhanced particles is at least one of tungsten carbide, titanium carbide and boron carbide; Described active wetting agents is Ni powder, at least one of Nb powder and industrial reduction iron powder; Described matrix strengthening agent is bismuth meal and antimony powder or one therein; By described enhanced particles, active wetting agents, the ratio uniform mixing of 1:1:0.001��0.002 is pressed in matrix strengthening agent, makes the complex intensifying particle block of 5��10mm, and be preheated to 350��400 DEG C stand-by;
B) smelt, casting designs: carry out the smelting of spheroidal graphite cast-iron matrix metal bath; After smelting completes, casting ladle first puts into the complex intensifying particle block being preheating to 350��400 DEG C, then pour into parent metal melt and strengthen, then pour into casting mold and carry out the casting of roll and breeding and nodularization of spheroidal graphite cast-iron;
C) heat treatment design: the compound particle strengthening roll cast is carried out isothermal hardening, obtains lower bainite tissue;
D) roll is carried out machining, obtain required crudy.
8. the preparation method that compound particle strengthens roll according to claim 7, it is characterised in that adopt described enhanced particles tungsten carbide when simultaneously, when titanium carbide and boron carbide, its ratio is 1:1:1.
9. the preparation method that compound particle strengthens roll according to claim 7, it is characterised in that the composition of described compound particle strengthened ductile cast iron matrix is added with Cu:0.2��0.4%, Ni:0��0.5%, Mg:0.04��0.06%, Nb:0.01��0.1%.
10. the preparation method that compound particle strengthens roll according to claim 7, it is characterised in that tensile strength sigma b >=800MPa, the impact flexibility �� k >=90J/cm of compound particle strengthening roll2��
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| CN106834884A (en) * | 2016-12-29 | 2017-06-13 | 中钢集团邢台机械轧辊有限公司 | The method for adding WC to strengthen particle in half steel material |
| CN108456825A (en) * | 2018-04-08 | 2018-08-28 | 山东四方钢管设备制造有限公司 | A kind of hot rolled seamless steel tube punch composite guide plate and its manufacturing method |
| CN111809116A (en) * | 2020-07-08 | 2020-10-23 | 山东四方工模具材料研究院有限公司 | Multi-element composite reinforced alloy semi-steel sizing/reducing mill roller and preparation method thereof |
| CN111922732A (en) * | 2020-06-29 | 2020-11-13 | 河北偶园钛模具有限公司 | Manufacturing method of composite guide plate for seamless tube puncher |
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| CN102268588A (en) * | 2011-06-22 | 2011-12-07 | 山东省四方技术开发有限公司 | Steel pipe reducing mill or sizing mill nodular cast iron roller and preparation method thereof |
| CN102330013A (en) * | 2011-09-22 | 2012-01-25 | 山东省四方技术开发有限公司 | Nodular cast iron roller of hot rolled seamless steel tube tandem mill and preparation method thereof |
| CN105121043A (en) * | 2013-03-01 | 2015-12-02 | 杰富意钢铁株式会社 | Roll outer layer material, and composite roll for hot rolling |
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| CN102268588A (en) * | 2011-06-22 | 2011-12-07 | 山东省四方技术开发有限公司 | Steel pipe reducing mill or sizing mill nodular cast iron roller and preparation method thereof |
| CN102330013A (en) * | 2011-09-22 | 2012-01-25 | 山东省四方技术开发有限公司 | Nodular cast iron roller of hot rolled seamless steel tube tandem mill and preparation method thereof |
| CN105121043A (en) * | 2013-03-01 | 2015-12-02 | 杰富意钢铁株式会社 | Roll outer layer material, and composite roll for hot rolling |
| US20150376748A1 (en) * | 2013-03-01 | 2015-12-31 | Jfe Steel Corporation | Roll outer layer material, and composite roll for hot rolling |
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| CN106834884A (en) * | 2016-12-29 | 2017-06-13 | 中钢集团邢台机械轧辊有限公司 | The method for adding WC to strengthen particle in half steel material |
| CN108456825A (en) * | 2018-04-08 | 2018-08-28 | 山东四方钢管设备制造有限公司 | A kind of hot rolled seamless steel tube punch composite guide plate and its manufacturing method |
| CN108456825B (en) * | 2018-04-08 | 2019-12-27 | 山东四方钢管设备制造有限公司 | Composite guide plate for hot-rolled seamless steel tube punching machine and manufacturing method thereof |
| CN111922732A (en) * | 2020-06-29 | 2020-11-13 | 河北偶园钛模具有限公司 | Manufacturing method of composite guide plate for seamless tube puncher |
| CN111809116A (en) * | 2020-07-08 | 2020-10-23 | 山东四方工模具材料研究院有限公司 | Multi-element composite reinforced alloy semi-steel sizing/reducing mill roller and preparation method thereof |
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| Publication number | Publication date |
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| CN105618485B (en) | 2017-05-17 |
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