CN106884126B - A kind of high chromium steel roller and its manufacturing method - Google Patents
A kind of high chromium steel roller and its manufacturing method Download PDFInfo
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- CN106884126B CN106884126B CN201611255519.XA CN201611255519A CN106884126B CN 106884126 B CN106884126 B CN 106884126B CN 201611255519 A CN201611255519 A CN 201611255519A CN 106884126 B CN106884126 B CN 106884126B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
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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
- C22C37/06—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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
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Abstract
The invention discloses a kind of high chromium steel rollers, including roll neck and by outer layer, the body of roll that core is constituted, it is characterized by: the weight percentage of the alloying component of outer layer and each alloying component are as follows: C:1.0~1.8%, Si:0.4~1.0%, Mn:0.5~1.0%, P :≤0.03%, S :≤0.025%, Cr:8.0~15%, Ni:0.5~1.5%, Mo:0.5~2.0%, V:0.4~1.5%, belong to machining and the heat treatment technics present invention and passes through reasonably optimizing moulding process and subsequent heat treatment process, realize the good combination of outer layer and core, it ensure that skin of the roll uniformity, and it is set to have high-wearing feature by rationally designing body of roll outer composition, high contact fatigue property and high tissue stabilization Property, extend the service life of roll.
Description
Technical field
The present invention relates to a kind of roll and manufacturing method, especially a kind of high chromium steel roller and its manufacturing method belong to machine
Tool processing and technical field of heat treatment.
Background technique
With the development of science and technology the continuous breakthrough of especially steel rolling technology, including to higher rolling efficiency, higher roll
The unremitting pursuit of material amount and minimum rolling cost makes roll manufacturing technology that tremendous development also occur.
The body of roll of large-scale roller is made of the working lining and internal core of outer layer, and when domestic production roll generally first leads to
The outer layer that centrifugal casting mode casts out roll is crossed, then the core inside mould assembling casting.Core is generally made of cast iron materials
And outer layer (working lining) is made of wear-resisting high alloy material.High chrome material becomes big rule with its excellent comprehensive performance
The ideal material of lattice slender type roll, the centrifugal compound casting of roll are a kind of roll production methods based on centrifugal casting,
It is the manufacturing method of the composite roll the most economically viable for the preparation methods such as jet deposition, hot isostatic pressing.
High chromium steel roller is due to bearing biggish rolling loads, it is desirable that equal with high binder course intensity and outer layer thickness
Even property needs to moulding process to ensure bonding layer quality and subsequent heat treatment process is further is improved.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of high chromium steel roller and its manufacturing methods, pass through reasonably optimizing
Moulding process and subsequent heat treatment process, realize the good combination of outer layer and core, ensure that skin of the roll uniformity,
And so that it is had high-wearing feature, high contact fatigue property and high structure stability by rationally designing body of roll outer composition, prolong
The service life of roll is grown.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of high chromium steel roller, including roll neck and the body of roll being made of outer layer, core, it is characterised in that: the alloy of outer layer
The weight percentage of ingredient and each alloying component are as follows: C:1.0~1.8%, Si:0.4~1.0%, Mn:0.5~1.0%, P:
≤ 0.03%, S :≤0.025%, Cr:8.0~15%, Ni:0.5~1.5%, Mo:0.5~2.0%, V:0.4~1.5%；
Roll neck, core material be spheroidal graphite cast-iron, the weight percentage of core alloy ingredient and each alloying component are as follows: C:
2.5~3.6%, Si:1.8~2.8%, Mn:0.4~1.0%, P :≤0.15, S :≤0.01%, Cr :≤0.2%, Ni :≤
1.0%, Mo :≤0.2%, V :≤0.2%, RE:0.01~0.05%, Mg:0.02~0.08%.
Technical solution of the present invention further improvement lies in that: the weight percent of the alloying component of outer layer and each alloying component contains
Amount are as follows: C:1.2~1.6%, Si:0.6~0.8%, Mn:0.6~0.9%, P :≤0.03%, S :≤0.025%, Cr:9.0~
14.0%, Ni:0.6~1.3%, Mo:0.8~1.7%, V:0.6~1.3%；
The weight percentage of roll neck, core alloy ingredient and each alloying component are as follows: C:2.8~3.4%, Si:2.0~
2.7%, Mn:0.5~1.8%, P :≤0.15%, S :≤0.01%, Cr :≤0.1%, Ni :≤0.8%, Mo :≤0.2%,
V :≤0.2%, RE:0.01~0.05%, Mg:0.02~0.08%.
A kind of manufacturing method of high chromium steel roller, it is characterised in that: including following technical process:
(1) melting: body of roll outer layer is equipped with alloy as raw material using steel scrap, is smelted in induction furnace, and smelting temperature is
1400~1650 DEG C；
Roll neck, core material be spheroidal graphite cast-iron, using the pig iron as raw material, smelting temperature be 1300~1500 DEG C, and to roll neck,
Core molten iron carries out inoculation and spheroidising；
(2) centrifugal casting: being poured the outer layer molten steel of the body of roll using centrifugal casting mode, when body of roll outer layer molten steel melting finishes
After be transferred in the leaky ladle of bottom, starting centrifuge work, set 80~120G for centrifuge gravitation multiple, it is cold to metal
Skin of the roll molten steel is poured in type tooling, wherein pouring temperature is 1400~1500 DEG C, and poring rate is 4.0~7.0 tons/point
Clock reduces centrifuge speed, makes the weight of centrifuge after being poured when metal mold external temperature is cooled to 1080-1180 DEG C
Force parameter is between 80~90G, until centrifugal casting process is completed, centrifugation time used in entire centrifugal casting process is 0.5
~1.5h；
(3) mould assembling casting core and roll neck: after centrifuge stops operating, will place pour the cold mould of the body of roll outer layer being poured in
Sandbox for being poured core and roll neck merges, and will pass through teeming mode by the core molten iron of nodularization and inoculation
It being poured into the sandbox after merging, wherein pouring temperature is 1350 DEG C~1450 DEG C, and poring rate is 6.0~10 tons/minutes,
Centrifuge stops operating to the time interval 4-9min of core casting complete；
(4) shake out sand removal: carrying out air-cooled, opening sandbox taking-up casting after air-cooled 5~10 days after to roll casting, and
Using the molding sand of snagging machine cleaning cast(ing) surface attachment；
(5) conditioning treatment: carrying out spheroidizing for casting, and 650 DEG C~950 DEG C of annealing temperature, 5~15h of soaking time,
Furnace cooling after heat preservation；
(6) final heat treatment: roller surface is heat-treated using quenching add-back ignition method, 1000 DEG C of hardening heat
~1200 DEG C, 1~5h of Quenching Soaking Time；450 DEG C~600 DEG C of tempering temperature, 5~20h of tempering time.
Technical solution of the present invention further improvement lies in that: in step (1), use nodulizer to be dilute in spheroidizing process
Native magnesium alloy, additive amount are the 1.0~3.5% of molten iron total amount, and inoculation is divided into be carried out twice, are that packet bottom is bred for the first time,
It is put into silicon iron inoculator and long-acting inovulant at packet bottom before coming out of the stove, wherein the additive amount of silicon iron inoculator accounts for molten iron total amount
0.1~0.4%, the additive amount of long-acting inovulant accounts for the 0.1~0.4% of molten iron total amount；Second is current-following inoculation, i.e. casting core
Silicon iron inoculator and long-acting inovulant are poured with stream during portion and roll neck, wherein the additive amount of silicon iron inoculator accounts for molten iron total amount
0.1~0.3%, the additive amount of long-acting inovulant accounts for the 0.1~0.3% of molten iron total amount.
Technical solution of the present invention further improvement lies in that: in step (6) tempering in triplicate, three times tempering heat preservation
Time amounts to 15~60h.
Technical solution of the present invention further improvement lies in that: body of roll outer layer thickness uniformity≤12mm.
By adopting the above-described technical solution, the technological progress achieved by the present invention is:
The present invention rationally designs the chemical component of roll, by the additional amount of optimization design alloying elements cr, Ni, Mo, V,
Ensure to obtain the carbide of high rigidity, the high rigidity carbide Mo of small and dispersed distribution2C, VC can assign material good heat
Treatment process performance, matrix is in the wearability that after pretreatment and final heat treatment two procedures, can be improved the body of roll and firmly
Degree, and there is high structure stability, in addition, the reasonable addition of Cr, Ni, the harden ability that can improve steel can also be formed surely
Fixed martensitic structure improves the wearability of roll, and service life improves 2 times or more compared with common chromium steel material.
In casting skin of the roll process in the present invention, centrifugal speed uses phasic Chang, first start casting will be from
The gravitation multiple of scheming is set as 80~120G, makes skin of the roll densification with higher in casting process by high speed centrifugation
Degree；To metal mold external temperature cooling procedure after being poured, centrifuge speed is reduced, the weight parameter of centrifuge is made to be located at 80
Between~90G, the time is provided for the abundant solidification of metal.
Further, the present invention is started to reduce centrifugal rotational speed, avoid when cold mould is cooled between 1080-1180 DEG C
Occur, cold mould temperature is too low will to can not achieve outer layer and the good metallurgical bonding of core；Cold mould temperature is excessively high, causes outer layer thickness
Partially thin and core alloy amount is big, and mechanical performance decline is not able to satisfy user's requirement.
The present invention is by outer layer and the Proper Match of core pouring temperature, by outer layer thickness uniformity controlling in≤12mm.
The inoculation of core is divided into twice, including packet bottom is bred and current-following inoculation, and packet bottom, which is bred, can promote graphite
It is precipitated, reduction has the tendency of degree of supercooling caused by nodulizer, and current-following inoculation can increase the elongation percentage of casting, prevent nodulizer too early
Decline causes abnormal nodularizing.
The present invention makes high chromium steel roller have optimal mechanical by reasonably deploying heat treatment method and technological parameter
Energy and service performance.
Specific embodiment
The present invention is described in further details below with reference to embodiment:
Embodiment 1
A kind of high chromium steel roller, including roll neck and the body of roll being made of outer layer, core, it is characterised in that: the alloy of outer layer
The weight percentage of ingredient and each alloying component are as follows: C:1.1~1.6%, Si:0.5~0.9%, Mn:0.5~0.8%, P:
≤ 0.03%, S :≤0.025%, Cr:8.0~12%, Ni:0.7~1.4%, Mo:0.9~1.6%, V:0.5~1.3%；
Roll neck, core material are spheroidal graphite cast-iron, the weight percentage of alloying component and each alloying component are as follows: C:2.5
~3.6%, Si:1.8~2.8%, Mn:0.4~1.0%, P :≤0.15, S :≤0.01%, Cr :≤0.2%, Ni :≤
1.0%, Mo :≤0.2%, V :≤0.2%, RE:0.01~0.05%, Mg:0.02~0.08%.
The above-mentioned manufacturing method suitable for a kind of high chromium steel roller, it is characterised in that: including following technical process:
(1) melting: body of roll outer layer is equipped with alloy as raw material using steel scrap, is smelted in induction furnace, and smelting temperature is
1400~1650 DEG C；
Roll neck, core material be spheroidal graphite cast-iron, using the pig iron as raw material, smelting temperature be 1300~1500 DEG C, and to roll neck,
Core molten iron carries out inoculation and spheroidising；
Alloying element is carried out to the outer layer of the body of roll analyze, obtain the alloying component and each alloying component of body of roll outer layer
Weight percentage are as follows: C:1.3%, Si:0.7%, Mn:0.7%, P :≤0.03%, S :≤0.025%, Cr:10%, Ni:
0.8%, Mo:1.2%, V:0.8%；
Wherein, use nodulizer for magnesium-rare earth in spheroidizing process, additive amount is the 1.5% of molten iron total amount, pregnant
It educates processing and is divided into and carry out twice, be that packet bottom is bred for the first time, that is, be put into silicon iron inoculator and long-acting inovulant at packet bottom before coming out of the stove,
Wherein the additive amount of silicon iron inoculator accounts for the 0.3% of molten iron total amount, and the additive amount of long-acting inovulant accounts for the 0.2% of molten iron total amount；
Second is current-following inoculation, i.e., pours silicon iron inoculator and long-acting inovulant with stream during being poured core and roll neck,
The additive amount of middle silicon iron inoculator accounts for the 0.1% of molten iron total amount, and the additive amount of long-acting inovulant accounts for the 0.2% of molten iron total amount.Its
In long-acting inovulant can be silicon titanate innoculant, Si-Sr inoculant or other composite inoculants.
(2) centrifugal casting: being poured the outer layer molten steel of the body of roll using centrifugal casting mode, when body of roll outer layer molten steel melting finishes
After be transferred in the leaky ladle of bottom, starting centrifuge work, 85G is set by the gravitation multiple of centrifuge, to metal cold mould work
Skin of the roll molten steel is poured in dress, wherein pouring temperature is 1420 DEG C, and poring rate is 4.5 tons/minutes, to gold after being poured
When genotype external temperature is cooled to 1100 DEG C, centrifuge speed is reduced, the gravitation multiple of centrifuge is made to be adjusted to 80G, until from
Heart casting process is completed, and centrifugation time used in entire centrifugal casting process is 0.8h；
(3) mould assembling casting core and roll neck: after centrifuge stops operating, will place pour the cold mould of the body of roll outer layer being poured in
Sandbox for being poured core and roll neck merges, and will pass through top by roll neck, the core molten iron of nodularization and inoculation
Note mode is poured into the sandbox after merging, wherein pouring temperature is 1350 DEG C, and poring rate is 6.0 tons/minutes, centrifuge
It stops operating to the time interval 4-9min of core casting complete；
(4) shake out sand removal: carrying out air-cooled, opening sandbox taking-up casting after air-cooled 5~10 days after to roll casting, and
Using the molding sand of snagging machine cleaning cast(ing) surface attachment；
(5) conditioning treatment: casting is subjected to spheroidizing, 700 DEG C of annealing temperature, soaking time 8 hours, heat preservation terminated
Furnace cooling afterwards；
(6) final heat treatment: being heat-treated roller surface using quenching add-back ignition method, 1050 DEG C of hardening heat,
Quenching Soaking Time 5h；Tempering in triplicate, 500 DEG C of first time tempering temperature, tempering time 10h；Second of tempering temperature
550 DEG C of degree, tempering time 15h；500 DEG C of first time tempering temperature, tempering time 15h；Tempering insulation time is total three times
40h。
Embodiment 2
A kind of high chromium steel roller, including roll neck and the body of roll being made of outer layer, core, it is characterised in that: the alloy of outer layer
The weight percentage of ingredient and each alloying component are as follows: C:1.3~1.5%, Si:0.6~0.7%, Mn:0.7~1.0%, P:
≤ 0.03%, S :≤0.025%, Cr:10~12%, Ni:0.8~1.2%, Mo:1.0~1.8%, V:0.8~1.2%；
The above-mentioned manufacturing method suitable for a kind of high chromium steel roller, it is characterised in that: including following technical process:
(1) melting: body of roll outer layer is equipped with alloy as raw material using steel scrap, is smelted in induction furnace, and smelting temperature is
1400~1650 DEG C；
Roll neck, core material be spheroidal graphite cast-iron, using the pig iron as raw material, smelting temperature be 1300~1500 DEG C, and to roll neck,
Core molten iron carries out inoculation and spheroidising；
Alloying element is carried out to the outer layer of the body of roll analyze, obtain the alloying component and each alloying component of body of roll outer layer
Weight percentage are as follows: C:1.5%, Si:0.7%, Mn:0.9%, P :≤0.03%, S :≤0.025%, Cr:11%, Ni:
1.0%, Mo:1.4%, V:1.0%；
Wherein, use nodulizer for magnesium-rare earth in spheroidizing process, additive amount is the 2.0% of molten iron total amount, pregnant
It educates processing and is divided into and carry out twice, be that packet bottom is bred for the first time, that is, be put into silicon iron inoculator and long-acting inovulant at packet bottom before coming out of the stove,
Wherein the additive amount of silicon iron inoculator accounts for the 0.2% of molten iron total amount, and the additive amount of long-acting inovulant accounts for the 0.1% of molten iron total amount；
Second is that current-following inoculation, i.e. casting core and roll neck pour silicon iron inoculator and long-acting inovulant with stream in the process, wherein silicon
The additive amount of iron inovulant accounts for the 0.3% of molten iron total amount, and the additive amount of long-acting inovulant accounts for the 0.1% of molten iron total amount.
(2) centrifugal casting: using the outer layer molten steel for being poured the body of roll using centrifugal casting mode, when body of roll outer layer molten steel melting
After be transferred in the leaky ladle of bottom, starting centrifuge work, gravitation multiple 100G is set by centrifuge parameters, to metal
Skin of the roll molten steel is poured in cold mould tooling, wherein pouring temperature is 1450 DEG C, and poring rate is 6 tons/minutes, after being poured
When metal mold external temperature is cooled to 1120 DEG C, centrifuge speed is reduced, so that the gravitation multiple of centrifuge is adjusted to 85G, directly
It is completed to centrifugal casting process, centrifugation time used in entire centrifugal casting process is 1h；
(3) mould assembling casting core and roll neck: after centrifuge stops operating, will place pour the cold mould of the body of roll outer layer being poured in
Sandbox for being poured core and roll neck merges, and will pass through teeming mode by the core molten iron of nodularization and inoculation
It is poured into the sandbox after merging, wherein pouring temperature is 1450 DEG C, and poring rate is 5.5 tons/minutes, and centrifuge stops turning
It moves to the time interval 4-9min of core casting complete；
(4) shake out sand removal: carrying out air-cooled, opening sandbox taking-up casting after air-cooled 5~10 days after to roll casting, and
Using the molding sand of snagging machine cleaning cast(ing) surface attachment；
(5) conditioning treatment: casting is subjected to spheroidizing, 750 DEG C of annealing temperature, soaking time 8 hours, heat preservation terminated
Furnace cooling afterwards；
(6) final heat treatment: being heat-treated roller surface using quenching add-back ignition method, 1100 DEG C of hardening heat,
Quenching Soaking Time 4h；Tempering in triplicate, 450 DEG C of first time tempering temperature, tempering time 5h；Second of tempering temperature
550 DEG C, tempering time 10h；600 DEG C of first time tempering temperature, tempering time 10h；Tempering insulation time amounts to 25h three times.
Embodiment 3
A kind of high chromium steel roller, including roll neck and the body of roll being made of outer layer, core, it is characterised in that: the alloy of outer layer
The weight percentage of ingredient and each alloying component are as follows: C:1.4~1.8%, Si:0.8~1.0%, Mn:0.8~1.0%, P:
≤ 0.03%, S :≤0.025%, Cr:11~15%, Ni:0.5~1.2%, Mo:1.2~2.0%, V:0.8~1.5%；
The above-mentioned manufacturing method suitable for a kind of high chromium steel roller, it is characterised in that: including following technical process:
(1) melting: body of roll outer layer is equipped with alloy as raw material using steel scrap, is smelted in induction furnace, and smelting temperature is
1400~1650 DEG C；Core material is spheroidal graphite cast-iron, and using the pig iron as raw material, smelting temperature is 1300~1500 DEG C, and to core
Molten iron carries out inoculation and spheroidising；
Alloying element is carried out to the outer layer of the body of roll analyze, obtain the alloying component and each alloying component of body of roll outer layer
Weight percentage are as follows: C:1.7%, Si:0.9%, Mn:1.0%, P :≤0.03%, S :≤0.025%, Cr:14%, Ni:
1.1%, Mo:1.9%, V:1.4%；
Wherein, use nodulizer for magnesium-rare earth in spheroidizing process, additive amount is the 3.0% of molten iron total amount, pregnant
It educates processing and is divided into and carry out twice, be that packet bottom is bred for the first time, that is, be put into silicon iron inoculator and long-acting inovulant at packet bottom before coming out of the stove,
Wherein the additive amount of silicon iron inoculator accounts for the 0.2% of molten iron total amount, and the additive amount of long-acting inovulant accounts for the 0.1% of molten iron total amount；
Second is that current-following inoculation, i.e. casting core and roll neck pour silicon iron inoculator and long-acting inovulant with stream in the process, wherein silicon
The additive amount of iron inovulant accounts for the 0.3% of molten iron total amount, and the additive amount of long-acting inovulant accounts for the 0.3% of molten iron total amount.
(2) centrifugal casting: using the outer layer molten steel for being poured the body of roll using centrifugal casting mode, when body of roll outer layer molten steel melting
After be transferred in the leaky ladle of bottom, starting centrifuge work, gravitation multiple 110G is set by centrifuge parameters, to metal
Skin of the roll molten steel is poured in cold mould tooling, wherein pouring temperature is 1500 DEG C, and poring rate is 6.5 tons/minutes, is poured
Afterwards when metal mold external temperature is cooled to 1160 DEG C, centrifuge speed is reduced, the gravitation multiple of centrifuge is made to be adjusted to 90G,
Until centrifugal casting process is completed, centrifugation time used in entire centrifugal casting process is 1.5h.
(3) mould assembling casting core and roll neck: after centrifuge stops operating, will place pour the cold mould of the body of roll outer layer being poured in
Sandbox for being poured core and roll neck merges, and will pass through teeming mode by the core molten iron of nodularization and inoculation
It is poured into the sandbox after merging, wherein pouring temperature is 1400 DEG C, and poring rate is 8 tons/minutes, and centrifuge stops operating
To the time interval 4-9min of core casting complete；
(4) shake out sand removal: carrying out air-cooled, opening sandbox taking-up casting after air-cooled 5~10 days after to roll casting, and
Using the molding sand of spheroidal graphite machine cleaning cast(ing) surface attachment；
(5) conditioning treatment: casting is subjected to spheroidizing, 850 DEG C of annealing temperature, soaking time 12 hours, heat preservation was tied
Furnace cooling after beam；
(6) final heat treatment: being heat-treated roller surface using quenching add-back ignition method, 1100 DEG C of hardening heat,
Quenching Soaking Time 3h；Tempering in triplicate, 450 DEG C of first time tempering temperature, tempering time 6h；Second of tempering temperature
600 DEG C, tempering time 12h；500 DEG C of first time tempering temperature, tempering time 12h；Tempering insulation time amounts to 30h three times.
The high chromium steel roller for being used for heavy and medium plate mill prepared by 1~embodiment of embodiment 3 has carried out performance test, including
Body of roll intensity, roll neck tensile strength, body of roll outer layer thickness uniformity, ultrasonic examination, wherein ultrasonic examination executes standard GB/
T1503-2008, testing result see the table below.
1 high chromium steel roller performance test results of table
By data in upper table it is known that outer layer thickness uniformity is small, and the close specification product outer layer of other materials
Thickness difference is generally higher than 20mm, and in addition high-chromium roll tissue transition produced by the invention is uniform, and result of detection meets GB/T1503-
Requirement in 2008 standards.
Above-described embodiment is described in further details to the present invention, and those skilled in the art can be according to the present embodiment institute
The method and parameter of offer are expanded, and other parameters range involved in the present invention is reached, and can be realized of the invention
Purpose.
Claims (5)
1. a kind of high chromium steel roller, including roll neck and the body of roll being made of outer layer, core, it is characterised in that: the alloy of outer layer at
Point and each alloying component weight percentage are as follows: C:1.0~1.8%, Si:0.4~1.0%, Mn:0.5~1.0%, P :≤
0.03%, S :≤0.025%, Cr:8.0~15%, Ni:0.5~1.5%, Mo:0.5~2.0%, V:0.4~1.5%, surplus be iron and
Inevitable impurity；
Roll neck, core material are spheroidal graphite cast-iron, the weight percentage of alloying component and each alloying component are as follows: C:2.5~
3.6%, Si:1.8~2.8%, Mn:0.4~1.0%, P :≤0.15, S :≤0.01%, Cr :≤0.2%, Ni :≤1.0%, Mo :≤
0.2%, V :≤0.2%, RE:0.01~0.05%, Mg:0.02~0.08%, surplus are iron and inevitable impurity；
Manufacturing method is made of following technical process:
(1) melting: body of roll outer layer is equipped with alloy as raw material using steel scrap, is smelted in induction furnace, smelting temperature be 1400~
1650℃；
Roll neck, core material are spheroidal graphite cast-iron, and using the pig iron as raw material, smelting temperature is 1300~1500 DEG C, and to roll neck, core
Molten iron carries out inoculation and spheroidising；
(2) centrifugal casting: being poured the outer layer molten steel of the body of roll using centrifugal casting mode, turns after body of roll outer layer molten steel melting
It moves on in the leaky ladle of bottom, starting centrifuge work sets 80~120G for the gravitation multiple of centrifuge, to metal cold mould work
Skin of the roll molten steel is poured in dress, wherein pouring temperature is 1400~1500 DEG C, and poring rate is 4.0~7.0 tons/minutes, is poured
After note when metal mold external temperature is cooled to 1080-1180 DEG C, centrifuge speed is reduced, the gravitation multiple of centrifuge is made
Between 80~90G, until centrifugal casting process is completed, centrifugation time used in entire centrifugal casting process is 0.5~1.5h；
(3) mould assembling casting core and roll neck: after centrifuge stops operating, the cold mould for pouring the body of roll outer layer being poured in will be placed and be used for
The sandbox of casting core and roll neck merges, and will be poured by the core molten iron of nodularization and inoculation by teeming mode
In sandbox after to merging, wherein pouring temperature is 1350 DEG C~1450 DEG C, and poring rate is 6.0~10 tons/minutes, centrifugation
Machine stops operating to 4~9min of time interval of core casting complete；
(4) shake out sand removal: air-cooled, opening sandbox taking-up casting after air-cooled 5~10 days is carried out after to roll casting, and is used
Snagging machine clears up the molding sand of cast(ing) surface attachment；
(5) conditioning treatment: casting is subjected to spheroidizing, 650 DEG C~950 DEG C of annealing temperature, 5~15h of soaking time, is kept the temperature
After furnace cooling；
(6) final heat treatment: roller surface is heat-treated using quenching add-back ignition method, hardening heat 1000 DEG C~1200
DEG C, 1~5h of Quenching Soaking Time；450 DEG C~600 DEG C of tempering temperature, 5~20h of tempering time.
2. a kind of high chromium steel roller according to claim 1, it is characterised in that: the alloying component of outer layer and each alloying component
Weight percentage are as follows: C:1.2~1.6%, Si:0.6~0.8%, Mn:0.6~0.9%, P :≤0.03%, S :≤0.025%,
Cr:9.0~14.0%, Ni:0.6~1.3%, Mo:0.8~1.7%, V:0.6~1.3%, surplus are iron and inevitable impurity；
The weight percentage of roll neck, the alloying component of core and each alloying component are as follows: C:2.8~3.4%, Si:2.0~2.7%,
Mn:0.5~1.0%, P :≤0.15%, S :≤0.01%, Cr :≤0.1%, Ni :≤0.8%, Mo :≤0.2%, V :≤0.2%, RE:
0.01~0.05%, Mg:0.02~0.08%, surplus are iron and inevitable impurity.
3. a kind of high chromium steel roller according to claim 1, it is characterised in that: in step (1), adopted in spheroidizing process
It is magnesium-rare earth with nodulizer, additive amount is the 1.0~3.5% of molten iron total amount, and inoculation is divided into be carried out twice, for the first time
It is that packet bottom is bred, that is, is put into silicon iron inoculator and long-acting inovulant at packet bottom before coming out of the stove, wherein the additive amount of silicon iron inoculator accounts for
The 0.1~0.4% of molten iron total amount, the additive amount of long-acting inovulant account for the 0.1~0.4% of molten iron total amount；Second is current-following inoculation,
Silicon iron inoculator and long-acting inovulant are poured with stream during being poured core and roll neck, the wherein addition of silicon iron inoculator
Amount accounts for the 0.1~0.3% of molten iron total amount, and the additive amount of long-acting inovulant accounts for the 0.1~0.3% of molten iron total amount.
4. a kind of high chromium steel roller according to claim 1, it is characterised in that: in step (6) tempering in triplicate,
Tempering insulation time amounts to 15~60h three times.
5. a kind of high chromium steel roller according to claim 1, it is characterised in that: body of roll outer layer thickness uniformity≤12mm.
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| CN108220808A (en) * | 2017-11-28 | 2018-06-29 | 昆山邦泰汽车零部件制造有限公司 | A kind of steel for manufacturing punch machining equipment for automotive punch |
| CN108411193B (en) * | 2018-03-15 | 2019-10-15 | 邢台德龙机械轧辊有限公司 | The manufacturing method of high chromium steel roller |
| CN108907149A (en) * | 2018-07-06 | 2018-11-30 | 莱芜莱钢集团金鼎轧辊有限公司 | A kind of duplex composite roll pouring procedure |
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| CN111001792B (en) * | 2019-12-31 | 2022-03-15 | 湖北腾升科技股份有限公司 | High-nickel high-chromium steel roller and preparation method thereof |
| CN111088416B (en) * | 2020-02-20 | 2021-10-01 | 常州艾柯轧辊有限公司 | Manufacturing process of high-strength roller and heat treatment device adopted in manufacturing process |
| CN111922321A (en) * | 2020-10-14 | 2020-11-13 | 常州凯达重工科技有限公司 | High-chromium cast iron roller and manufacturing method of bottom pouring type high-chromium cast iron roller |
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