CN104353798B - 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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- CN104353798B CN104353798B CN201410546174.8A CN201410546174A CN104353798B CN 104353798 B CN104353798 B CN 104353798B CN 201410546174 A CN201410546174 A CN 201410546174A CN 104353798 B CN104353798 B CN 104353798B
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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
-
- 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
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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
- C22C37/04—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
-
- 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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- Mechanical Engineering (AREA)
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- Metallurgy (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
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 are and in particular to be used for the high-speed steel working roll of hot continuous rolling precision rolling rear
Manufacture method.
Background technology
Icdp roll last century the '30s come out, and are mainly used in hot strip rolling working roll, due to containing more conjunction
Gold element, does not typically adopt one piece casting mode to produce.Limited by equipment, the icdp roll of early stage adopts reverberatory smelting, complete
Rinse complex method to produce, until succeeding in developing and coming into operation of horizontal centrifuge, apply power frequency induction furnace melting to set simultaneously
Standby, centrifugal compound icdp roll quality has the raising of matter.Modified model icdp based on research and development on the basis of plain edition icdp roll
Roll, forms element by adding alloy carbide, increases in tissue the wear-resisting particle of high microhardness so that roll wearability carries
High, roll shape holding capacity strengthens, and comprehensive using effect improves more than 10%.
With the development of steel and iron industry, to plate surface quality, dimensional accuracy, plate face flatness requirement more and more higher.Steel
Ferrum enterprise is to improve board quality grade further, persistently reduce production cost, to precision rolling rear Wear Resistance, rough surface
Degree holding capacity simultaneously has both the aspects such as the good anti-accident ability higher demand of proposition, and modified model icdp roll is subject to material and technique
The restriction of method is difficult to meet further requirement.
Content of the invention
The technical problem to be solved in the invention is to provide a kind of high-carbon for hot continuous rolling precision rolling rear working roller at a high speed
Steel roll, makes the anti-wear performance of roll and heat crack resistance improve.
For solving above-mentioned technical problem, 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, including using centre spinning method manufacture
The body of roll being made up of body of roll working lining and core of the roll becoming and roll neck, the chemical composition of described body of roll working lining and each composition
Weight percentage is: 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%, remaining is fe and inevitable impurity；
The metallographic structure of body of roll working lining be bainite matrix on be dispersed with nodular graphite or group worm shape graphite, bainite, martensite,
Retained austenite, carbide；The content of wherein nodular graphite or group's worm shape graphite accounts for 0.5-2.0%, and the content of carbide is respectively
For 18-35%.
The present invention further improvement is that including following technical process:
A) smelt: according to the chemical composition of body of roll working lining and the weight percentage of each composition, by the pig iron, steel scrap, conjunction
Gold is put in induction furnace and is smelted, and 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, is smelted with the pig iron for raw material during smelting in electric furnace, smelts temperature
Spend for 1450 DEG C～1530 DEG C, in molten iron, before coming out of the stove, add inovulant and nodulizer, inovulant is ferrosilicon, and addition is 0.2%
～1.0%, nodulizer is magnesium-rare earth, and addition is 0.5%～1.5%；
B) centrifugal casting: pour into a mould body of roll working lining first, the pouring temperature of molten steel is 1300 DEG C～1400 DEG C, during cast from
Scheming rotating speed is 600～700 revs/min, after the completion of body of roll working lining pouring molten steel, 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: the sandbox pouring the sandbox being poured in body of roll working lining be used for pouring into a mould roll neck is carried out
Merge, by the sandbox to after merge for the molten iron casting handled well, pouring temperature is 1300 DEG C～1380 DEG C；
D) shake out sand removal: after foundry goods slow cooling 120 hours～170 hours in sandbox, open sandbox and take out foundry goods, cleaning
The molding sand of cast(ing) surface attachment；
E) heat treatment: heat treatment is using using two sections or three-stage tempering process, 450 DEG C～550 DEG C of temperature, tempering
Time amounts to 150 hours～260 hours.
Due to adopting technique scheme, have the beneficial effects that produced by the present invention:
The present invention by alloying component reasonable in design and production technology, makes c, si, mn, cr, ni, mo, v in roll etc.
Alloying element can play more preferable synergism, effectively improve the mechanical performance of working roll, and have good anti-thing
Therefore property and wearability, the work efficiency of milling train can be substantially improved.
The present invention is produced by the way of composite centrifugal casting, while ensureing working lining hard high-wearing feature, protects
Demonstrate,prove the toughness of core of the roll, improve 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 pass through centrifugation
The method of casting had both met roll working lining high rigidity, the demand of high-wearing feature be compound to working lining with core together with, and
Ensure that there is at core and roll neck preferable toughness.In the present invention during cast of roll working lining, the rotating speed of centrifuge controls
600～700 revs/min, roll working lining can be made to have higher consistency in casting process, when the steel of body of roll working lining
After water casting complete, by the adjustment of rotational speed of centrifuge to 450～550 revs/min, reduce centrifuge speed, molten steel can be made
Cold contraction process is smoothed out, and effectively reduces gravity segregation.
Temperature retention time in sandbox for the medium casting of the present invention be 120 hours～170 hours it is ensured that foundry goods uniformly cold
But, it is to avoid cracking.
In the present invention, the special thermal treatment technique of roll further improves roll graphite, tissue and carbide morphology, work
Make graphite in layer, distribution of carbides more uniformity it is ensured that roll the phase still has stable rolling to show after a procedure.
Roll in the present invention can directly substitute traditional icdp roll and use on the machine, and do not need to carry out any tune to milling train
Whole, actual effect of rolling shows, high carbon high speed steel roll millimeter amount of rolling can reach more than 2 times of traditional icdp, machine under roll
Surface quality is good afterwards, thoroughly solves the phenomenon such as surface coarsening, aberration, ripple after the common lower machine of icdp roll.
Roll in the present invention is extending the roll change cycle, is reducing in machine abrasion, reduce stock removal, improve the side such as sheet material grade
There are outstanding contributions in face.
Brief description
Fig. 1 and Fig. 2 is the metallographic structure figure of the body of roll working lining of the present invention.
Specific embodiment
For the manufacture method of the high-speed steel working roll of hot continuous rolling precision rolling rear, this working roll includes the body of roll and roll neck, roller
The working lining of body is fabricated by using centre spinning method, and after the working lining casting complete of the body of roll, core and roll neck are poured into a mould in mould assembling.
During casting this working roll, the weight percentage of the chemical composition of body of roll working lining and each composition is 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%, remaining is fe and inevitable impurity.Cast,
After heat treatment, the metallographic structure of body of roll working lining is to be dispersed with nodular graphite or group's worm shape graphite, bayesian on bainite matrix
Body, martensite, retained austenite, carbide；The content of wherein nodular graphite or group's worm shape graphite accounts for 0.5-2.0%, carbide
Content be respectively 18-35%.
(when not having specified otherwise, the addition of all substances is as follows for casting during concrete manufacture and heat treatment process
Percentage by weight).
Embodiment 1
A) smelt: suitable alloy is equipped with as raw material with the pig iron, steel scrap, according to the chemical composition of the body of roll working lining setting
And the weight percentage intermediate value of each composition is equipped with raw material, 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 sensing
Smelted in stove, smelting temperature is 1470 DEG C, before coming out of the stove, added silicon iron inoculator, addition is the 1.0% of molten steel weight；
The material of core of the roll and roll neck is spheroidal graphite cast-iron, is smelted with the pig iron for raw material during smelting in electric furnace, smelts temperature
Spend for 1520 DEG C, in molten iron, before coming out of the stove, add inovulant and nodulizer, inovulant is ferrosilicon, and addition is molten steel weight
0.6%, nodulizer is magnesium-rare earth, and addition is 0.5%；
B) centrifugal casting: pour into a mould body of roll working lining first, the pouring temperature of molten steel is 1400 DEG C, centrifuge speed during cast
For 700 revs/min, after the completion of body of roll working lining pouring molten steel, centrifuge speed is adjusted to 520 revs/min, until cast
Exospheric temperature be cooled to 980 DEG C；
C) mould assembling cast core and roll neck: the sandbox pouring the sandbox being poured in body of roll working lining be used for pouring into a mould roll neck is carried out
Merge, by the sandbox to after merge for the molten iron casting handled well, pouring temperature is 1380 DEG C；
D) shake out sand removal: after foundry goods slow cooling 152 hours in sandbox, open sandbox and take out foundry goods, clear up cast(ing) surface
The molding sand of attachment；
E) heat treatment:, using using two-part tempering process, (temperature can be 450 for 480 DEG C of temperature for heat treatment
DEG C～500 DEG C between fluctuate), tempering time amount to 180 hours.
Roll, after above-mentioned dispensing, casting, heat treatment, learns the chemical composition in roll working lining through chemical composition analysis
Meet above-mentioned sets requirement.Learn through metallographic structure analysis (metallographic structure photo is as depicted in figs. 1 and 2): working lining steel
Matrix, based on bainite, bainite matrix is dispersed with nodular graphite or group's worm shape graphite, bainite, martensite, remnants
Austenite, carbide.The content of wherein nodular graphite or group's worm shape graphite accounts for 0.97%, and the content of carbide is respectively
33.31%.
Carbide is with m3Based on c type eutectic carbide (ledeburite type), intermediate distribution a certain amount of mc, m2c、m6C type carbon
Compound, more tiny compared with the high nickel chromium triangle of modified model, almost invisible under 200 times of photos.Due to mc, m2c、m6C type carbide is micro-
Extreme hardness, as wear-resisting particle, can effectively reduce roll in machine wear extent, significantly reduce roller consumption.
Embodiment 2
A) smelt: suitable alloy is equipped with as raw material with the pig iron, steel scrap, according to the chemical composition of the body of roll working lining setting
And the weight percentage intermediate value of each composition is equipped with raw material, 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 sense
Answer in stove and smelted, smelting temperature is 1450 DEG C, before coming out of the stove, add silicon iron inoculator, addition is the 0.8% of molten steel weight；
The material of core of the roll and roll neck is spheroidal graphite cast-iron, is smelted with the pig iron for raw material during smelting in electric furnace, smelts temperature
Spend for 1500 DEG C, in molten iron, before coming out of the stove, add inovulant and nodulizer, inovulant is ferrosilicon, and addition is molten steel weight
0.5%, nodulizer is magnesium-rare earth, and addition is 1.0%；
B) centrifugal casting: pour into a mould body of roll working lining first, the pouring temperature of molten steel is 1350 DEG C, centrifuge speed during cast
For 650 revs/min, after the completion of body of roll working lining pouring molten steel, centrifuge speed is adjusted to 500 revs/min, until cast
Exospheric temperature be cooled to 1000 DEG C；
C) mould assembling cast core and roll neck: the sandbox pouring the sandbox being poured in body of roll working lining be used for pouring into a mould roll neck is carried out
Merge, by the sandbox to after merge for the molten iron casting handled well, pouring temperature is 1350 DEG C；
D) shake out sand removal: after foundry goods slow cooling 140 hours in sandbox, open sandbox and take out foundry goods, clear up cast(ing) surface
The molding sand of attachment；
E) heat treatment: using using three-stage tempering process, 500 DEG C of temperature, it is little that tempering time amounts to 200 to heat treatment
When.
Roll, after above-mentioned dispensing, casting, heat treatment, learns the chemical composition in roll working lining through chemical composition analysis
Meet above-mentioned sets requirement.Learn through metallographic structure analysis (metallographic structure photo is as depicted in figs. 1 and 2): working lining steel
Matrix, based on bainite, bainite matrix is dispersed with nodular graphite or group's worm shape graphite, bainite, martensite, remnants
Austenite, carbide.The content of wherein nodular graphite or group's worm shape graphite accounts for 1.06%, and the content of carbide is respectively
33.41%.
Carbide is with m3Based on c type eutectic carbide (ledeburite type), intermediate distribution a certain amount of mc, m2c、m6C type carbon
Compound, more tiny compared with the high nickel chromium triangle of modified model, almost invisible under 200 times of photos.Due to mc, m2c、m6C type carbide is micro-
Extreme hardness, as wear-resisting particle, can effectively reduce roll in machine wear extent, significantly reduce roller consumption.
Embodiment 3
A) smelt: suitable alloy is equipped with as raw material with the pig iron, steel scrap, according to the chemical composition of the body of roll working lining setting
And the weight percentage intermediate value of each composition is equipped with raw material, 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 sensing
Smelted in stove, smelting temperature is 1550 DEG C, before coming out of the stove, added silicon iron inoculator, addition is the 0.6% of molten steel weight；
The material of core of the roll and roll neck is spheroidal graphite cast-iron, is smelted with the pig iron for raw material during smelting in electric furnace, smelts temperature
Spend for 1450 DEG C, in molten iron, before coming out of the stove, add inovulant and nodulizer, inovulant is ferrosilicon, and addition is molten steel weight
1.0%, nodulizer is magnesium-rare earth, and addition is 1.5%；
B) centrifugal casting: pour into a mould body of roll working lining first, the pouring temperature of molten steel is 1300 DEG C, centrifuge speed during cast
For 600 revs/min, after the completion of body of roll working lining pouring molten steel, centrifuge speed is adjusted to 420 revs/min, until cast
Exospheric temperature be cooled to 900 DEG C；
C) mould assembling cast core and roll neck: the sandbox pouring the sandbox being poured in body of roll working lining be used for pouring into a mould roll neck is carried out
Merge, by the sandbox to after merge for the molten iron casting handled well, pouring temperature is 1300 DEG C；
D) shake out sand removal: after foundry goods slow cooling 120 hours in sandbox, open sandbox and take out foundry goods, clear up cast(ing) surface
The molding sand of attachment；
E) heat treatment:, using using three-stage tempering process, (temperature can be 500 for 520 DEG C of temperature for heat treatment
DEG C～550 DEG C between fluctuate), tempering time amount to 230 hours.
Roll, after above-mentioned dispensing, casting, heat treatment, learns the chemical composition in roll working lining through chemical composition analysis
Meet above-mentioned sets requirement.Learn through metallographic structure analysis (metallographic structure photo is as depicted in figs. 1 and 2): working lining steel
Matrix, based on bainite, bainite matrix is dispersed with nodular graphite or group's worm shape graphite, bainite, martensite, remnants
Austenite, carbide.The content of wherein nodular graphite or group's worm shape graphite accounts for 1.97%, and the content of carbide is respectively
24.53%.
Carbide is with m3Based on c type eutectic carbide (ledeburite type), intermediate distribution a certain amount of mc, m2c、m6C type carbon
Compound, more tiny compared with the high nickel chromium triangle of modified model, almost invisible under 200 times of photos.Due to mc, m2c、m6C type carbide is micro-
Extreme hardness, as wear-resisting particle, can effectively reduce roll in machine wear extent, significantly reduce roller consumption.
The present invention only lists above three embodiment, and those skilled in the art can be according to description of the invention, will
The parameters such as the content of chemical composition and each additive, temperature, time are expanded into any value scope described in the invention, equal energy
Reach the purpose of the present invention.
Claims (2)
1. it is used for the manufacture method of the high-speed steel working roll of hot continuous rolling precision rolling rear, be fabricated by including using centre spinning method
The body of roll being made up of body of roll working lining and core of the roll and roll neck it is characterised in that: the chemical composition of described body of roll working lining
And the weight percentage of each composition is: 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 6.00～10.00%, s≤0.05%, p≤0.10%, remaining is fe and not
Impurity can be avoided；The metallographic structure of body of roll working lining is to be dispersed with nodular graphite on bainite matrix or roll into a ball worm shape graphite wherein
One kind, is also dispersed with bainite, martensite, retained austenite, carbide on bainite matrix simultaneously；Wherein nodular graphite or
The content of group's worm shape graphite accounts for 0.5-2.0%, and the content of carbide is 18-35%；During centrifugal casting body of roll working lining, the pouring of molten steel
Note temperature is 1300 DEG C～1400 DEG C, and during cast, centrifuge speed is 600～700 revs/min, when body of roll working lining pouring molten steel
After the completion of, centrifuge speed is adjusted to 450～550 revs/min, until the exospheric temperature of cast is cooled to 900 DEG C～1100
℃.
2. the manufacture method of the high-speed steel working roll for hot continuous rolling precision rolling rear according to claim 1, its feature exists
In the following technical process of inclusion:
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
Enter in induction furnace and smelted, smelting temperature is 1450 DEG C～1550 DEG C, before coming out of the stove, add silicon iron inoculator, addition is molten steel
The 0.6～1.0% of weight；
The material of core of the roll and roll neck is spheroidal graphite cast-iron, is smelted with the pig iron for raw material during smelting in electric furnace, and smelting temperature is
1450 DEG C～1530 DEG C, in molten iron, before coming out of the stove, add inovulant and nodulizer, inovulant is ferrosilicon, and addition is molten steel weight
0.2%～1.0%, nodulizer be magnesium-rare earth, addition be molten steel weight 0.5%～1.5%；
B) centrifugal casting: pour into a mould body of roll working lining first, the pouring temperature of molten steel is 1300 DEG C～1400 DEG C, centrifuge during cast
Rotating speed is 600～700 revs/min, after the completion of body of roll working lining pouring molten steel, centrifuge speed is adjusted to 450～550
Rev/min, until the exospheric temperature of cast is cooled to 900 DEG C～1100 DEG C；
C) mould assembling cast core and roll neck: the sandbox pouring the sandbox being poured in body of roll working lining be used for pouring into a mould roll neck is closed
And, by the sandbox to after merge for the molten iron casting handled well, pouring temperature is 1300 DEG C～1380 DEG C；
D) shake out sand removal: after foundry goods slow cooling 120 hours～170 hours in sandbox, open sandbox and take out foundry goods, clear up foundry goods
The molding sand of surface attachment；
E) heat treatment: heat treatment is using using two sections or three-stage tempering process, 450 DEG C～550 DEG C of temperature, tempering time
Amount to 150 hours～260 hours.
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| JP4070695B2 (en) * | 2003-09-25 | 2008-04-02 | 株式会社東芝 | Heat-resistant alloy parts material |
| CN100467151C (en) * | 2007-04-03 | 2009-03-11 | 西安交通大学 | Low-aliquation high-speed steel roll and the preparing method |
| CN101956124B (en) * | 2010-09-26 | 2013-12-18 | 中钢集团邢台机械轧辊有限公司 | Wear-resistant high holding precision rolling rear working roller and production method thereof |
| CN102615108B (en) * | 2012-04-09 | 2014-01-29 | 北京工业大学 | Centrifugal casting high-speed steel composite roll and manufacture method thereof |
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