CN104384193A - High speed steel finishing roll of wire bar mill and manufacturing method of high speed steel finishing roll - Google Patents
High speed steel finishing roll of wire bar mill and manufacturing method of high speed steel finishing roll Download PDFInfo
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Abstract
The invention discloses a high speed steel finishing roll of a wire bar mill and a manufacturing method of the high speed steel finishing roll, belonging to the technical field of machining and casting. The finishing roll consists of a roll neck and a roll body comprising a working layer, a primary core and a core part; the working layer comprises the following chemical components: 1.50-2.50 percent of C, 0.40-1.00 percent of Si, 0.40-0.80 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S, 4.0-8.0 percent of Cr, 0.50-1.00 percent of Ni, 5.00-8.00 percent of Mo and 5.00-8.00 percent of V. In the casting process, the casting temperature and the rotating speed of a centrifuge can be controlled by adopting manners of high-temperature discharge from a furnace, low-temperature casting, high-speed mold filling and slow-down solidification. According to the high speed steel finishing roll and the manufacturing method of the high speed steel finishing roll, the adaptability of high speed steel materials on bar rolling can be effectively solved by reasonable design of alloy components and the processing technology, and the wear resistance and the millimeter rolling quantity of the roll are improved; in addition, the high speed steel finishing roll has favorable thermal crack resistance, and the working efficiency of a heavy and medium plate mill can be greatly improved.
Description
Technical field
The present invention relates to a kind of roll and manufacture method, belong to machining and casting technology field.
Background technology
In recent years, China's building, road and bridge industry development are rapid, and wire and rod consumption significantly promotes, and simultaneously along with every engineering is for the lifting of wire and rod quality, propose sooner each wire and rod rolling level, more excellent requirement.In order to adapt to the demand in market, bar wire rod rolling mill is just progressively to high speed, modernization development, but the unmatched problem of production efficiency of traditional finishing stand roll wearability and milling train also constantly highlights, steel rolling mill wishes to improve the wearability of roll and anti-accident ability, reduce roller consumption to greatest extent, extend the roll online cycle.
The body of roll of large-scale roller is made up of outer field working lining and inner core, generally first casts out outer field working lining by centrifugal casting mode during domestic production roll, then at the core that mould assembling cast is inner.Core is generally made up of cast iron materials and outer (working lining) is made up of wear-resisting high alloy material.High-speed steel material, with its excellent combination property, becomes the ideal material of bar wire rod rolling mill finishing stand roll, is the developing direction of bar wire rod rolling mill finishing stand roll material.Current high-speed steel roll is widely applied abroad, is not only applied to cold hot rolled plate, hoop mill, and is applied to bar & high speed wire rolling mill, roughing mill, pipe-mill etc.At home by the restriction of the aspect such as rolling condition and steel rolling mill's capacity to reprocess, high-speed steel roll is still in the starting stage of development and application, isochrone bar compound high speed steel roll general requirements is less, during employing conventional centrifugal composite casting, yield rate is lower, outer (working lining) thickness and global quality control difficulty very big, overseas high speed steel roll generally adopts jet deposition, the modes such as high temperature insostatic pressing (HIP) are produced, improve quality and the yield rate of high-speed steel roll to a great extent, but its manufacture of the high-speed steel roll produced by this and use cost are very high, therefore develop a kind of cost-effective wire and rod high-speed steel roll thing must go.
The centrifugal compound casting of roll is a kind of roll production method based on centrifugal casting, is the most economically viable composite roll manufacture method for the preparation method such as jet deposition, high temperature insostatic pressing (HIP).High-speed steel roll is owing to bearing larger rolling loads, require that there is high binder course intensity, for guaranteeing bonding layer quality, three layers of combined producing tech can be adopted, namely outer field working lining (high alloy material), middle close binder (play transition and support combination, also referred to as a core), core is comprised.By controlling the parameter in intermediate layer, improve bonding layer quality, but bar wire rod rolling mill high speed steel rider specification is little, iron water amount is few, designs independent Interlayer Alloy iron water amount less, and wayward being difficult to of technological parameter guarantees bonding layer quality.
The development of current domestic Bar Wire Product high-speed steel roll still belongs to advanced development, and casting technological parameter still belongs to the stage of fumbling, because itself fluctuation is comparatively large, causes the qualified casting of compound high speed steel roll low, directly affects its research and development process.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of planishing roll and manufacture method thereof of wire and bar mill high-speed steel material, with the technical problems such as in use wearability is inadequate, surface quality is poor, easy hot tearing that solve traditional roll, produce for wire and rod high-speed steel material roll and a kind of economically viable manufacture method is provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of high-speed steel planishing roll of wire and bar mill, the body of roll comprising roll neck and be made up of working lining, core, a core, the alloying component of working lining and the weight percentage of each alloying component are C:1.50 ~ 2.50%, Si:0.40 ~ 1.00%, Mn:0.40 ~ 0.80%, P≤0.03%; S≤0.03%, Cr:4.0 ~ 8.0%, Ni:0.50 ~ 1.00%, Mo:5.00 ~ 8.00%, V:5.00 ~ 8.00%, all the other are Fe and inevitable impurity; The thickness of working lining is 30 ~ 60mm, thickness evenness≤10mm.
A manufacture method for the high-speed steel planishing roll of wire and bar mill, comprises following technical process:
A) smelt: body of roll working lining is equipped with alloy for raw material with steel scrap, smelts in induction furnace, and smelting temperature is 1500 DEG C ~ 1600 DEG C;
A core and core material are spheroidal graphite cast-iron, take the pig iron as raw material, and smelting temperature is 1460 DEG C ~ 1500 DEG C; Do not process after coming out of the stove as the molten iron of a core, adopt in bag after coming out of the stove as the molten iron of core and breed and spheroidising, inovulant is ferrosilicon, and addition is 0.4% ~ 0.8% of molten iron total amount, nodulizer is magnesium-rare earth, and addition is 0.5% ~ 1.3% of molten iron total amount;
B) centrifugal casting: first pour into a mould body of roll working lining, the pouring temperature of working lining molten steel is 1400 DEG C ~ 1500 DEG C, during cast, centrifuge speed is 600 ~ 800 revs/min, after body of roll working lining pouring molten steel completes, centrifuge speed is adjusted to 450 ~ 550 revs/min, until the exospheric temperature of cast is cooled to more than liquid-solid phase line 10 ~ 50 DEG C, then improving centrifuge speed is 600 ~ 800 revs/min, and starts to pour into a mould the untreated molten iron as a core;
C) mould assembling cast core and roll neck: the sandbox placing the body of roll working lining poured into a mould is merged with the sandbox being used for pouring into a mould roll neck; Be poured in the sandbox after merging by the core molten iron through rotten and inoculation, pouring temperature is 1360 DEG C ~ 1420 DEG C;
D) shake out sand removal: after 100 ~ 150 hours, open sandbox and take out foundry goods until foundry goods slow cooling in sandbox, the molding sand of cleaning cast(ing) surface attachment;
E) conditioning treatment: foundry goods is carried out stress relief annealing, annealing temperature 400 DEG C ~ 600 DEG C, temperature retention time 120 ~ 200 hours, cools with stove after insulation terminates; Then machining need size and precision;
F) finished heat treatment: adopt differential quenching method breaker roll surface to heat-treat, hardening heat 1000 DEG C ~ 1200 DEG C, Quenching Soaking Time 2 hours ~ 10 hours, adopts spraying or quenching mode to cool; Temperature 450 DEG C ~ 550 DEG C, tempering time amounts to 120 ~ 170 hours.
The further improvement of the manufacture method of the planishing roll of wire and bar mill of the present invention is: the tapping temperature of molten steel and difference >=60 DEG C of pouring temperature during smelting working lining.
One time core iron hydromining power pack carries out quantitative pouring.
A core iron water and core molten iron smelt water outlet with stove, and while a core cast, core molten iron carries out bag endometamorphism and inoculation, carries out core cast when one time core has solidified.
During cast core, core molten iron adopts porous gate spool to inject die cavity, controls core molten iron flow state.
Owing to adopting technique scheme, the beneficial effect that the present invention produces is:
The roll adopting method of the present invention and material to manufacture, the technical problems such as in use wearability is inadequate, surface quality is poor, easy hot tearing that solve traditional roll.The present invention, by the appropriate design of alloying component, has successfully prepared the high-speed steel roll being applicable to wire and rod rolling line finishing stand, and this roll material possesses the high alloy characteristic of high-speed steel material, and alloy is evenly distributed, and effectively ensure that roll working lining performance indications; Adopt novel manufacture method, improve wire and bar mill small dimension high-speed steel roll working lining THICKNESS CONTROL ability, make outer layer thickness difference be no more than 10mm, working lining is combined with core well, can meet the rolling needs of wire and rod simultaneously.
Alloy total content >=15% of the high-speed steel material working lining in the present invention, fabulous ensure that working lining alloy basis, and the alloying elements such as C, Mn, Cr, Mo, V can be uniformly distributed, ensure that the alloy amount of dissolving in matrix carbon U content and matrix, high-speed steel material overall performance is guaranteed.Mode that high speed steel matter melting of the present invention and pouring technology adopt " high temperature is come out of the stove, cast cold ", come out of the stove and pour into a mould the temperature difference and control at >=60 DEG C, ensure that smelt stage alloying element can be uniformly distributed, molten steel is through sufficient standing and adopt cast cold, impurity is fully floated and the degree of superheat reducing molten steel improves coagulation efficacy.Ectomesoderm centrifugal casting process centrifuge speed of the present invention controls to adopt " fill type at a high speed, reduction of speed solidifies " mode to ensure that outer high-speed steel fills type and even solidification fast.In the present invention, a core and core molten iron are with stove water outlet, do not carry out rotten and spheroidising directly to pour into a mould, both reached and reduced core to skin anti-erosion amount, served the effect in intermediate layer simultaneously yet, and intermediate layer and core with stove smelt have simple to operate, the advantage that energy consumption is low.Adopt the mode of process in core ladle in the present invention, make a core cast and the synchronism of core molten iron time, improve production efficiency.
The present invention adopts porous gate spool when pouring into a mould core molten iron, and porous gate spool possesses filtration, slag stopping function, can stop the field trash in molten iron, effectively prevents the generation of roll binder course slag inclusion accident; Meanwhile, molten iron is being gone out by porous head time-division plume, flows out phase specific surface tension increase with overall one, make molten iron flow to middle polymerization, serve good rectified action, molten iron stream is in stable condition in roll die cavity, wash away evenly outer field, skin of the roll thickness evenness is less than 10mm.
Detailed description of the invention
The high-speed steel planishing roll of wire and bar mill and manufacture method thereof, the body of roll that planishing roll comprises roll neck and is made up of working lining, core, a core, the alloying component of working lining and the weight percentage of each alloying component are C:1.50 ~ 2.50%, Si:0.40 ~ 1.00%, Mn:0.40 ~ 0.80%, P≤0.03%; S≤0.03%, Cr:4.0 ~ 8.0%, Ni:0.50 ~ 1.00%, Mo:5.00 ~ 8.00%, V:5.00 ~ 8.00%, all the other are Fe and inevitable impurity; The thickness of working lining is 30 ~ 60mm, thickness evenness≤10mm.
The manufacture method of the high-speed steel planishing roll of above-mentioned wire and bar mill comprises following technical process:
A) smelt:
Body of roll working lining is equipped with suitable alloy for raw material with high-quality steel scrap, smelts in induction furnace, and smelting temperature is 1500 DEG C ~ 1600 DEG C, the chemical composition of each alloy is adjusted in above-mentioned scope;
A core and core material are spheroidal graphite cast-iron, take the pig iron as raw material, and smelting temperature is 1460 DEG C ~ 1500 DEG C; Do not process after coming out of the stove as the molten iron of a core, adopt in bag after coming out of the stove as the molten iron of core and breed and spheroidising, inovulant is ferrosilicon, and addition is 0.4% ~ 0.8% of molten iron total amount, nodulizer is magnesium-rare earth, and addition is 0.5% ~ 1.3% of molten iron total amount;
B) centrifugal casting:
First body of roll working lining is poured into a mould, mode that the melting of working lining molten steel and pouring technology adopt " high temperature is come out of the stove, cast cold ", the pouring temperature of working lining molten steel is 1400 DEG C ~ 1500 DEG C, and the tapping temperature of working lining molten steel should higher than pouring temperature more than at least 60 DEG C.The mode of " fill type at a high speed, reduction of speed solidifies " in working lining centrifugal casting process, is adopted to control centrifuge speed, to ensure that outer high-speed steel fills type and even solidification fast.During cast, centrifuge speed is 600 ~ 800 revs/min, after body of roll working lining pouring molten steel completes, centrifuge speed is adjusted to 450 ~ 550 revs/min, until the exospheric temperature of cast is cooled to more than liquid-solid phase line 10 ~ 50 DEG C, then improving centrifuge speed is 600 ~ 800 revs/min, and starts to pour into a mould the untreated molten iron as a core; One time core iron hydromining power pack carries out quantitative pouring, and during a core cast, centrifuge speed can adjust according to a core cast situation.
Core molten iron and a core iron water smelt water outlet simultaneously with stove, and while a core cast, core molten iron synchronously carries out bag endometamorphism and inoculation, carries out core cast when one time core has solidified.
C) mould assembling cast core and roll neck:
The sandbox placing the body of roll working lining poured into a mould is merged with the sandbox being used for pouring into a mould roll neck; Be poured in the sandbox after merging by the core molten iron through rotten and inoculation, pouring temperature is 1360 DEG C ~ 1420 DEG C, to ensure with the fusion mass of binder course and to be beneficial to inclusion floating; During cast core, core molten iron adopts porous gate spool to inject die cavity, and controls core molten iron flow state.During cast core, core molten iron adopts porous gate spool to inject die cavity, and porous gate spool possesses filtration, slag stopping function, can stop the field trash in molten iron, effectively prevents the generation of roll binder course slag inclusion accident; Meanwhile, molten iron is being gone out by porous head time-division plume, flows out phase specific surface tension increase with overall one, and make molten iron flow to middle polymerization, serve good rectified action, molten iron stream is in stable condition in roll die cavity, washes away evenly outer field.
D) shake out sand removal: after 100 ~ 150 hours, open sandbox and take out foundry goods until foundry goods slow cooling in sandbox, the molding sand of cleaning cast(ing) surface attachment;
E) conditioning treatment: foundry goods is carried out stress relief annealing, annealing temperature 400 DEG C ~ 600 DEG C, temperature retention time 120 ~ 200 hours, cools with stove after insulation terminates; Then machining need size and precision;
F) finished heat treatment: adopt differential quenching method breaker roll surface to heat-treat, hardening heat 1000 DEG C ~ 1200 DEG C, Quenching Soaking Time 2 hours ~ 10 hours, adopts spraying or quenching mode to cool; Temperature 450 DEG C ~ 550 DEG C, tempering time amounts to 120 ~ 170 hours.
Only be described in further details the present invention with an embodiment below, the method that those skilled in the art can provide according to the present embodiment and parameter are expanded, and reach other parameter area involved in the present invention, all can realize object of the present invention.
Certain steel rolling mill's finishing stand roll main technical requirements domestic is: specification: Φ 430 × 650 × 1535 mm, and scrapping diameter is Φ 360mm; Working lining thickness >=35mm, working lining hardness: 75 ~ 80HSD.
The weight percentage of high-speed steel skin (working lining) alloying component and each alloying component is designed to C:1.50 ~ 1.70%, Si:0.70 ~ 0.90%, Mn:0.78 ~ 0.88%, P≤0.03%; S≤0.03%, Cr:4.50 ~ 4.70%, Ni:0.50 ~ 0.70%, Mo:5.90 ~ 6.10%, V:6.10 ~ 6.30%, all the other are Fe and inevitable impurity.
In fusion process, body of roll working lining is equipped with suitable alloy for raw material with high-quality steel scrap, smelts in induction furnace, and smelting temperature is 1550 DEG C; Core of the roll is spheroidal graphite cast-iron, take the pig iron as raw material, and smelting temperature is 1480 DEG C.
According to roll technology requirement, consider the compound with intermediate layer, working lining cast thickness is designed to 55mm, and intermediate layer thickness is 30mm.During cast, setting working lining cast centrifugal rotational speed is 600 revs/min, and working lining is poured rear centrifuge speed and is reduced to 500 revs/min.Working lining pouring temperature is defined as 1450 ± 5 DEG C.Core pouring temperature is defined as: 1500 ± 5 DEG C, early stage Quick pouring until on molten iron to certain altitude, suitably reduce poring rate and be beneficial to molten iron feeding.
In casting process, by temperature instrumentation monitoring working lining inner wall temperature, according to the temperature of the working lining detected, arrange coming out of the stove of core molten iron.When being about to reach setting temperature by temperature measurer monitoring layer molten steel, improve centrifuge speed to 700 revs/min, pour into a core iron water, pouring temperature is 1510 ± 5 DEG C, and casting process carries out quantitative pouring by power pack.
After pouring into a mould a core, the remaining molten iron of simultaneously coming out of the stove carries out bag endometamorphism and spheroidising, and inovulant is ferrosilicon, and addition is 0.4% ~ 0.8%, and nodulizer is magnesium-rare earth, and addition is 1% ~ 1.3%.
Monitoring a core temperature by temperature measurer, carrying out mould assembling, the good porous gate spool of frame by having poured into a mould body of roll sandbox with the sandbox being used for pouring into a mould roll neck when temperature reaches freezing point, cast core molten iron.
Stokehold sampling detects chemical composition, and the chemical composition of working lining is after testing: C 1.51%, Si 0.73%, Mn 0.80%, P 0.01%, S 0.005%, Cr 4.55%, Ni 0.61%, Mo 6.01%, V 6.20%, all the other are Fe and inevitable impurity.
Foundry goods is carried out stress relief annealing, annealing temperature 550 DEG C, temperature retention time 180 hours after roll polishing sand removal, cool with stove after insulation terminates; Then machining need size and precision.Roll finally adopts differential quenching method breaker roll surface to heat-treat, hardening heat 1100 DEG C, Quenching Soaking Time 3 hours, adopts quenching mode to cool; Adopt multistage tempering, temperature is respectively 525 DEG C, 525 DEG C and 550 DEG C, and tempering time amounts to 130 hours.It is 77 ~ 79HSD that roll detects hardness of roll body after heat treatment and processed finished products, and flaw detection working lining thickness is 42 ~ 48mm, ultrasonic examination binder course wave height 10 ~ 20%.The linear wearing capacity of roll of the present invention under same experimental conditions reduces by 75% than high-ni-cr roll, and reduce by 60% than pin ball centrifugal roller, steel transportation amount is 2 ~ 3 times of high-ni-cr roll and pin ball centrifugal roller.
Claims (6)
1. the high-speed steel planishing roll of a wire and bar mill, the body of roll comprising roll neck and be made up of working lining, core, a core, it is characterized in that: the alloying component of working lining and the weight percentage of each alloying component are C:1.50 ~ 2.50%, Si:0.40 ~ 1.00%, Mn:0.40 ~ 0.80%, P≤0.03%; S≤0.03%, Cr:4.0 ~ 8.0%, Ni:0.50 ~ 1.00%, Mo:5.00 ~ 8.00%, V:5.00 ~ 8.00%, all the other are Fe and inevitable impurity; The thickness of working lining is 30 ~ 60mm, thickness evenness≤10mm.
2. a manufacture method for the high-speed steel planishing roll of wire and bar mill according to claim 1, is characterized in that comprising following technical process:
A) smelt: body of roll working lining is equipped with alloy for raw material with steel scrap, smelts in induction furnace, and smelting temperature is 1500 DEG C ~ 1600 DEG C;
A core and core material are spheroidal graphite cast-iron, take the pig iron as raw material, and smelting temperature is 1460 DEG C ~ 1500 DEG C; Do not process after coming out of the stove as the molten iron of a core, adopt in bag after coming out of the stove as the molten iron of core and breed and spheroidising, inovulant is ferrosilicon, and addition is 0.4% ~ 0.8% of molten iron total amount, nodulizer is magnesium-rare earth, and addition is 0.5% ~ 1.3% of molten iron total amount;
B) centrifugal casting: first pour into a mould body of roll working lining, the pouring temperature of working lining molten steel is 1400 DEG C ~ 1500 DEG C, during cast, centrifuge speed is 600 ~ 800 revs/min, after body of roll working lining pouring molten steel completes, centrifuge speed is adjusted to 450 ~ 550 revs/min, until the exospheric temperature of cast is cooled to more than liquid-solid phase line 10 ~ 50 DEG C, then improving centrifuge speed is 600 ~ 800 revs/min, and starts to pour into a mould the untreated molten iron as a core;
C) mould assembling cast core and roll neck: the sandbox placing the body of roll working lining poured into a mould is merged with the sandbox being used for pouring into a mould roll neck; Be poured in the sandbox after merging by the core molten iron through rotten and inoculation, pouring temperature is 1360 DEG C ~ 1420 DEG C;
D) shake out sand removal: after 100 ~ 150 hours, open sandbox and take out foundry goods until foundry goods slow cooling in sandbox, the molding sand of cleaning cast(ing) surface attachment;
E) conditioning treatment: foundry goods is carried out stress relief annealing, annealing temperature 400 DEG C ~ 600 DEG C, temperature retention time 120 ~ 200 hours, cools with stove after insulation terminates; Then machining need size and precision;
F) finished heat treatment: adopt differential quenching method breaker roll surface to heat-treat, hardening heat 1000 DEG C ~ 1200 DEG C, Quenching Soaking Time 2 hours ~ 10 hours, adopts spraying or quenching mode to cool; Temperature 450 DEG C ~ 550 DEG C, tempering time amounts to 120 ~ 170 hours.
3. the manufacture method of the high-speed steel planishing roll of wire and bar mill according to claim 2, is characterized in that: the tapping temperature of molten steel and difference >=60 DEG C of pouring temperature during smelting working lining.
4. the manufacture method of the high-speed steel planishing roll of wire and bar mill according to claim 2, is characterized in that: one time core iron hydromining power pack carries out quantitative pouring.
5. the manufacture method of the high-speed steel planishing roll of wire and bar mill according to claim 4, it is characterized in that: a core iron water and core molten iron smelt water outlet with stove, while a core cast, core molten iron carries out bag endometamorphism and inoculation, carries out core cast when one time core has solidified.
6. the manufacture method of the high-speed steel planishing roll of wire and bar mill according to claim 2, is characterized in that: during cast core, core molten iron adopts porous gate spool to inject die cavity, controls core molten iron flow state.
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| CN109594018B (en) * | 2018-12-26 | 2021-09-10 | 中钢集团邢台机械轧辊有限公司 | Centrifugal casting high-speed steel pinch roll and manufacturing method thereof |
| CN111136245A (en) * | 2019-12-26 | 2020-05-12 | 中钢集团邢台机械轧辊有限公司 | Roll collar for bar mill reducing and sizing mill set and preparation method thereof |
| CN112176253A (en) * | 2020-09-21 | 2021-01-05 | 成都三强轧辊股份有限公司 | H-shaped steel roll collar and manufacturing method thereof |
| CN112264465A (en) * | 2020-09-29 | 2021-01-26 | 武汉钢铁有限公司 | Centrifugal composite roller |
| CN112264465B (en) * | 2020-09-29 | 2022-06-17 | 武汉钢铁有限公司 | Centrifugal composite roller |
| CN112359293A (en) * | 2020-11-23 | 2021-02-12 | 武汉轻工大学 | Mo-V series high-speed steel roll collar for KOCKS bar mill and preparation method thereof |
| CN113547099A (en) * | 2021-06-11 | 2021-10-26 | 中钢集团邢台机械轧辊有限公司 | Preparation method of rough-rolled high-speed steel working roll for full-endless rolling of sheet billet |
| CN113621877A (en) * | 2021-06-29 | 2021-11-09 | 江苏沙钢集团有限公司 | Centrifugal composite high-speed steel roller of bar and wire mill and preparation method thereof |
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