CN104353798A - Manufacturing method for high-speed steel working roll at hot continuous rolling finish rolling rear section - Google Patents
Manufacturing method for high-speed steel working roll at hot continuous rolling finish rolling rear section Download PDFInfo
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- CN104353798A CN104353798A CN201410546174.8A CN201410546174A CN104353798A CN 104353798 A CN104353798 A CN 104353798A CN 201410546174 A CN201410546174 A CN 201410546174A CN 104353798 A CN104353798 A CN 104353798A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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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
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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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
Abstract
The invention discloses a manufacturing method for a high-speed steel working roll at a hot continuous rolling finish rolling rear section. The working layer of a roll body comprises the following chemical components in percentages by weight: 2.00-3.50% of C, 0.40-2.00% of Si, 0.50-1.20% of Mn, 1.50-4.50% of Cr, 2.00-5.00% of Ni, 2.00-10.00% of Mo, V, W and Nb, 0-0.05% of S, 0-0.10% of P, and the balance of Fe and unavoidable impurities. The manufacturing method comprises the steps of smelting, inoculation and spheroidizing and pouring, and heat treatment. Through the alloy compositions with reasonable design and the production technology, a special graphite and metallographic structure is obtained. According to the high-carbon high-speed steel roll at the hot continuous rolling finish rolling rear section, the quality of rear surface of a machine under the roll can be effectively controlled, and meanwhile the abrasive resistance and heat cracking resistance of the roll are improved.
Description
Technical field
The present invention relates to a kind of roll and manufacture method, be specifically related to the manufacture method of the high-speed steel working roll for hot continuous rolling precision rolling rear.
Background technology
ICDP roll the '30s in last century comes out, and is mainly used in hot strip rolling working roll, due to containing more alloying element, does not generally adopt monoblock cast mode to produce.By equipment restriction, early stage ICDP roll adopts reverberatory smelting, full complex method of rinsing is produced, until the succeeding in developing and coming into operation of horizontal centrifuge, apply power frequency induction furnace smelting equipment, centrifugal compound ICDP roll quality has had the raising of matter simultaneously.Based on the modified ICDP roll that plain edition ICDP roll basis is researched and developed, by adding alloy carbide forming element, increase the wear-resisting particle of high microhardness in tissue, make the raising of roll wearability, the enhancing of roll shape hold facility, comprehensive result of use improves more than 10%.
Along with the development of steel and iron industry, require more and more higher to plate surface quality, dimensional accuracy, plate surface evenness.Iron and steel enterprise improves board quality grade, lasting reduction production cost further, to precision rolling rear Wear Resistance, surface roughness hold facility have both the aspect such as good anti-accident ability and propose higher demand, modified ICDP roll is difficult to meet the demands further by the restriction of material and process.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of high carbon high speed steel roll for hot continuous rolling precision rolling rear working roller, and the anti-wear performance of roll and heat crack resistance are improved.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
For the manufacture method of the high-speed steel working roll of hot continuous rolling precision rolling rear, comprise the body of roll be made up of body of roll working lining and core of the roll and roll neck that adopt centre spinning method manufacture, the chemical composition of described body of roll working lining and the weight percentage of each composition are: C 2.00 ~ 3.50%, Si 0.40 ~ 2.00%, Mn 0.50 ~ 1.20%, Cr 1.50 ~ 4.50%, Ni 2.00 ~ 5.00%, Mo+V+W+Nb 2.00 ~ 10.00%, S≤0.05%, P≤0.10%, all the other are Fe and inevitable impurity; The metallographic structure of body of roll working lining is bainite matrix is dispersed with nodular graphite or rolls into a ball worm shape graphite, bainite, martensite, retained austenite, carbide; Wherein the content of nodular graphite or group's worm shape graphite accounts for 0.5-2.0%, and the content of carbide is respectively 18-35%.
The present invention improves further and is to comprise following technical process:
A) smelt: according to the chemical composition of body of roll working lining and the weight percentage of each composition, the pig iron, steel scrap, alloy are put into induction furnace and smelted, smelting temperature is 1450 DEG C ~ 1550 DEG C, adds silicon iron inoculator before coming out of the stove, and addition is 0.6 ~ 1.0%;
The material of core of the roll and roll neck is spheroidal graphite cast-iron, be that raw material is smelted with the pig iron in electric furnace during smelting, smelting temperature is 1450 DEG C ~ 1530 DEG C, in molten iron, inovulant and nodulizer is added before coming out of the stove, inovulant is ferrosilicon, addition is 0.2% ~ 1.0%, and nodulizer is magnesium-rare earth, and addition is 0.5% ~ 1.5%;
B) centrifugal casting: first pour into a mould body of roll working lining, the pouring temperature of molten steel is 1300 DEG C ~ 1400 DEG C, during cast, centrifuge speed is 600 ~ 700 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 900 DEG C ~ 1100 DEG C;
C) mould assembling cast core and roll neck: merged with the sandbox being used for pouring into a mould roll neck by the sandbox having poured into a mould body of roll working lining, be poured into by the molten iron handled well in the sandbox after merging, pouring temperature is 1300 DEG C ~ 1380 DEG C;
D) shake out sand removal: after 120 hours ~ 170 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) heat treatment: heat treatment adopts employing two sections or syllogic tempering process, and temperature 450 DEG C ~ 550 DEG C, tempering time amounts to 150 hours ~ 260 hours.
Owing to adopting technique scheme, the beneficial effect that the present invention produces is:
The present invention is by alloying component reasonable in design and production technology, the alloying elements such as C, Si, Mn, Cr, Ni, Mo, V in roll are enable to play better synergy, effectively improve the mechanical performance of working roll, and there is good anti-accident and wearability, significantly can promote the operating efficiency of milling train.
The mode that the present invention adopts composite centrifugal to cast is produced, and while guarantee working lining hard high-wearing feature, ensure that the toughness of core of the roll, improves surface quality and the service life of roll.
In the present invention, the working lining of roll and core adopt different materials and different smelting processes, then together with by the method for centrifugal casting working lining being compound to core, both met the demand of roll working lining high rigidity, high-wearing feature, in turn ensure that core and roll neck place had good toughness.In the present invention during the cast of roll working lining, the rotating speed of centrifuge controls at 600 ~ 700 revs/min, can make roll working lining in casting process, have higher density, after the pouring molten steel of body of roll working lining completes, by the adjustment of rotational speed of centrifuge to 450 ~ 550 revs/min, reduce centrifuge speed, the contraction process that molten steel can be made cold carries out smoothly, effectively reduces gravity segregation.
The slow cooling time of medium casting of the present invention in sandbox is 120 hours ~ 170 hours, ensure that the Homogeneous cooling of foundry goods, avoids cracking.
In the present invention, the special thermal treatment technique of roll further improves roll graphite, tissue and carbide morphology, graphite, distribution of carbides uniformity more in working lining, ensure that the phase still has stable rolling performance to roll after a procedure.
Roll in the present invention can directly substitute traditional IC DP roll and use on the machine, and do not need to carry out any adjustment to milling train, actual effect of rolling shows, high carbon high speed steel roll millimeter amount of rolling can reach more than 2 times of traditional IC DP, under roll, machine rear surface quality is good, thoroughly solves the phenomenon such as lower machine rear surface alligatoring, aberration, ripple that ICDP roll is common.
Roll in the present invention in the prolongation roll change cycle, reduce in machine wearing and tearing, reduce stock removal, improve sheet material grade etc. in have outstanding contributions.
Accompanying drawing explanation
Fig. 1 and Fig. 2 is the metallographic structure figure of body of roll working lining of the present invention.
Detailed description of the invention
For the manufacture method of the high-speed steel working roll of hot continuous rolling precision rolling rear, this working roll comprises the body of roll and roll neck, and the working lining of the body of roll adopts centre spinning method manufacture to form, after the working lining casting complete of the body of roll, and mould assembling cast core and roll neck.In the process of this working roll of casting, the chemical composition of body of roll working lining and the weight percentage of each composition are according to following component preparation raw material: C 2.00 ~ 3.50%, Si 0.40 ~ 2.00%, Mn 0.50 ~ 1.20%, Cr 1.50 ~ 4.50%, Ni 2.00 ~ 5.00%, Mo+V+W+Nb 2.00 ~ 10.00%, S≤0.05%, P≤0.10%, all the other are Fe and inevitable impurity.After casting, heat treatment, the metallographic structure of body of roll working lining is bainite matrix is dispersed with nodular graphite or rolls into a ball worm shape graphite, bainite, martensite, retained austenite, carbide; Wherein the content of nodular graphite or group's worm shape graphite accounts for 0.5-2.0%, and the content of carbide is respectively 18-35%.
Casting during concrete manufacture and heat treatment process following (when not having specified otherwise, the addition of all substances is all weight percentage).
Embodiment 1
A) smelt: be equipped with suitable alloy for raw material with the pig iron, steel scrap, raw material is equipped with according to the chemical composition of the body of roll working lining of setting and the weight percentage median of each composition, i.e. C 2.75%, Si 1.7%, Mn 0.85%, Cr 3.0%, Ni 3.50%, Mo+V+W+Nb 6.0%, S≤0.05%, P≤0.10% prepares raw material.During smelting, the pig iron, steel scrap, alloy are put into induction furnace and smelted, smelting temperature is 1470 DEG C, adds silicon iron inoculator before coming out of the stove, and addition is 1.0% of molten steel weight;
The material of core of the roll and roll neck is spheroidal graphite cast-iron, be that raw material is smelted with the pig iron in electric furnace during smelting, smelting temperature is 1520 DEG C, in molten iron, inovulant and nodulizer is added before coming out of the stove, inovulant is ferrosilicon, addition is 0.6% of molten steel weight, and nodulizer is magnesium-rare earth, and addition is 0.5%;
B) centrifugal casting: first pour into a mould body of roll working lining, the pouring temperature of molten steel is 1400 DEG C, and during cast, centrifuge speed is 700 revs/min, after body of roll working lining pouring molten steel completes, centrifuge speed is adjusted to 520 revs/min, until the exospheric temperature of cast is cooled to 980 DEG C;
C) mould assembling cast core and roll neck: merged with the sandbox being used for pouring into a mould roll neck by the sandbox having poured into a mould body of roll working lining, be poured into by the molten iron handled well in the sandbox after merging, pouring temperature is 1380 DEG C;
D) shake out sand removal: after 152 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) heat treatment: heat treatment adopts two-part tempering process, and temperature 480 DEG C (temperature can fluctuate between 450 DEG C ~ 500 DEG C), tempering time amounts to 180 hours.
Roll is after above-mentioned batching, casting, heat treatment, and the chemical composition learnt in roll working lining through chemical composition analysis meets above-mentioned setting requirement.Learn through metallographic structure analysis (metallographic structure photo as depicted in figs. 1 and 2): the matrix of working lining steel, based on bainite, bainite matrix is dispersed with nodular graphite or rolls into a ball worm shape graphite, bainite, martensite, retained austenite, carbide.Wherein the content of nodular graphite or group's worm shape graphite accounts for 0.97%, and the content of carbide is respectively 33.31%.
Carbide is with M
3c type eutectic carbide (ledeburite type) is main, intermediate distribution a certain amount of MC, M
2c, M
6c type carbide, more tiny compared with modified height nickel chromium triangle, visible hardly under 200 times of photos.Due to MC, M
2c, M
6c type carbide microhardness is high, as wear-resisting particle, effectively can reduce roll in machine wear extent, significantly reduces roller consumption.
Embodiment 2
A) smelt: be equipped with suitable alloy for raw material with the pig iron, steel scrap, raw material is equipped with according to the chemical composition of the body of roll working lining of setting and the weight percentage median of each composition, i.e. C 2.15%, Si 0.5%, Mn 1.2%, Cr 4.5%, Ni 2.00%, Mo+V+W+Nb 2.00%, S≤0.05%, P≤0.10% prepares raw material.During smelting, the pig iron, steel scrap, alloy are put into induction furnace and smelted, smelting temperature is 1450 DEG C, adds silicon iron inoculator before coming out of the stove, and addition is 0.8% of molten steel weight;
The material of core of the roll and roll neck is spheroidal graphite cast-iron, be that raw material is smelted with the pig iron in electric furnace during smelting, smelting temperature is 1500 DEG C, in molten iron, inovulant and nodulizer is added before coming out of the stove, inovulant is ferrosilicon, addition is 0.5% of molten steel weight, and nodulizer is magnesium-rare earth, and addition is 1.0%;
B) centrifugal casting: first pour into a mould body of roll working lining, the pouring temperature of molten steel is 1350 DEG C, and during cast, centrifuge speed is 650 revs/min, after body of roll working lining pouring molten steel completes, centrifuge speed is adjusted to 500 revs/min, until the exospheric temperature of cast is cooled to 1000 DEG C;
C) mould assembling cast core and roll neck: merged with the sandbox being used for pouring into a mould roll neck by the sandbox having poured into a mould body of roll working lining, be poured into by the molten iron handled well in the sandbox after merging, pouring temperature is 1350 DEG C;
D) shake out sand removal: after 140 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) heat treatment: heat treatment adopts syllogic tempering process, and temperature 500 DEG C, tempering time amounts to 200 hours.
Roll is after above-mentioned batching, casting, heat treatment, and the chemical composition learnt in roll working lining through chemical composition analysis meets above-mentioned setting requirement.Learn through metallographic structure analysis (metallographic structure photo as depicted in figs. 1 and 2): the matrix of working lining steel, based on bainite, bainite matrix is dispersed with nodular graphite or rolls into a ball worm shape graphite, bainite, martensite, retained austenite, carbide.Wherein the content of nodular graphite or group's worm shape graphite accounts for 1.06%, and the content of carbide is respectively 33.41%.
Carbide is with M
3c type eutectic carbide (ledeburite type) is main, intermediate distribution a certain amount of MC, M
2c, M
6c type carbide, more tiny compared with modified height nickel chromium triangle, visible hardly under 200 times of photos.Due to MC, M
2c, M
6c type carbide microhardness is high, as wear-resisting particle, effectively can reduce roll in machine wear extent, significantly reduces roller consumption.
Embodiment 3
A) smelt: be equipped with suitable alloy for raw material with the pig iron, steel scrap, raw material is equipped with according to the chemical composition of the body of roll working lining of setting and the weight percentage median of each composition, i.e. C3.50%, Si 2.00%, Mn 0.50%, Cr 1.50%, Ni 5.0%, Mo+V+W+Nb 10.0%, S≤0.05%, P≤0.10% prepares raw material.During smelting, the pig iron, steel scrap, alloy are put into induction furnace and smelted, smelting temperature is 1550 DEG C, adds silicon iron inoculator before coming out of the stove, and addition is 0.6% of molten steel weight;
The material of core of the roll and roll neck is spheroidal graphite cast-iron, be that raw material is smelted with the pig iron in electric furnace during smelting, smelting temperature is 1450 DEG C, in molten iron, inovulant and nodulizer is added before coming out of the stove, inovulant is ferrosilicon, addition is 1.0% of molten steel weight, and nodulizer is magnesium-rare earth, and addition is 1.5%;
B) centrifugal casting: first pour into a mould body of roll working lining, the pouring temperature of molten steel is 1300 DEG C, and during cast, centrifuge speed is 600 revs/min, after body of roll working lining pouring molten steel completes, centrifuge speed is adjusted to 420 revs/min, until the exospheric temperature of cast is cooled to 900 DEG C;
C) mould assembling cast core and roll neck: merged with the sandbox being used for pouring into a mould roll neck by the sandbox having poured into a mould body of roll working lining, be poured into by the molten iron handled well in the sandbox after merging, pouring temperature is 1300 DEG C;
D) shake out sand removal: after 120 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) heat treatment: heat treatment adopts syllogic tempering process, and temperature 520 DEG C (temperature can fluctuate between 500 DEG C ~ 550 DEG C), tempering time amounts to 230 hours.
Roll is after above-mentioned batching, casting, heat treatment, and the chemical composition learnt in roll working lining through chemical composition analysis meets above-mentioned setting requirement.Learn through metallographic structure analysis (metallographic structure photo as depicted in figs. 1 and 2): the matrix of working lining steel, based on bainite, bainite matrix is dispersed with nodular graphite or rolls into a ball worm shape graphite, bainite, martensite, retained austenite, carbide.Wherein the content of nodular graphite or group's worm shape graphite accounts for 1.97%, and the content of carbide is respectively 24.53%.
Carbide is with M
3c type eutectic carbide (ledeburite type) is main, intermediate distribution a certain amount of MC, M
2c, M
6c type carbide, more tiny compared with modified height nickel chromium triangle, visible hardly under 200 times of photos.Due to MC, M
2c, M
6c type carbide microhardness is high, as wear-resisting particle, effectively can reduce roll in machine wear extent, significantly reduces roller consumption.
The present invention only lists above-mentioned three embodiments, those skilled in the art can according to description of the invention, the parameter such as content, temperature, time of chemical composition and each additive is expanded into arbitrary number range described in the invention, all can reaches object of the present invention.
Claims (2)
1. for the manufacture method of the high-speed steel working roll of hot continuous rolling precision rolling rear, comprise the body of roll be made up of body of roll working lining and core of the roll and roll neck that adopt centre spinning method manufacture, it is characterized in that: the chemical composition of described body of roll working lining and the weight percentage of each composition are: C 2.00 ~ 3.50%, Si 0.40 ~ 2.00%, Mn 0.50 ~ 1.20%, Cr 1.50 ~ 4.50%, Ni 2.00 ~ 5.00%, Mo+V+W+Nb 2.00 ~ 10.00%, S≤0.05%, P≤0.10%, all the other are Fe and inevitable impurity; The metallographic structure of body of roll working lining is bainite matrix is dispersed with nodular graphite or rolls into a ball worm shape graphite, bainite, martensite, retained austenite, carbide; Wherein the content of nodular graphite or group's worm shape graphite accounts for 0.5-2.0%, and the content of carbide is respectively 18-35%.
2. the manufacture method of the high-speed steel working roll for hot continuous rolling precision rolling rear according to claim 1, is characterized in that comprising following technical process:
A) smelt: according to the chemical composition of body of roll working lining and the weight percentage of each composition, the pig iron, steel scrap, alloy are put into induction furnace and smelted, smelting temperature is 1450 DEG C ~ 1550 DEG C, adds silicon iron inoculator before coming out of the stove, and addition is 0.6 ~ 1.0%;
The material of core of the roll and roll neck is spheroidal graphite cast-iron, be that raw material is smelted with the pig iron in electric furnace during smelting, smelting temperature is 1450 DEG C ~ 1530 DEG C, in molten iron, inovulant and nodulizer is added before coming out of the stove, inovulant is ferrosilicon, addition is 0.2% ~ 1.0% nodulizer is magnesium-rare earth, and addition is 0.5% ~ 1.5%;
B) centrifugal casting: first pour into a mould body of roll working lining, the pouring temperature of molten steel is 1300 DEG C ~ 1400 DEG C, during cast, centrifuge speed is 600 ~ 700 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 900 DEG C ~ 1100 DEG C;
C) mould assembling cast core and roll neck: merged with the sandbox being used for pouring into a mould roll neck by the sandbox having poured into a mould body of roll working lining, be poured into by the molten iron handled well in the sandbox after merging, pouring temperature is 1300 DEG C ~ 1380 DEG C;
D) shake out sand removal: after 120 hours ~ 170 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) heat treatment: heat treatment adopts employing two sections or syllogic tempering process, and temperature 450 DEG C ~ 550 DEG C, tempering time amounts to 150 hours ~ 260 hours.
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| CN105274425A (en) * | 2015-10-28 | 2016-01-27 | 中钢集团邢台机械轧辊有限公司 | High-alloy roller for front stage of hot continuous finish rolling and preparation method thereof |
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