CN110508785A - Hot-rolled steel section roll and its preparation method - Google Patents

Hot-rolled steel section roll and its preparation method Download PDF

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Publication number
CN110508785A
CN110508785A CN201910890626.7A CN201910890626A CN110508785A CN 110508785 A CN110508785 A CN 110508785A CN 201910890626 A CN201910890626 A CN 201910890626A CN 110508785 A CN110508785 A CN 110508785A
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Prior art keywords
hot
rolled steel
steel section
roll
section roll
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CN201910890626.7A
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CN110508785B (en
Inventor
王邦裕
孙建魁
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Sino Metallurgical Equipment (shanghai) Co Ltd
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Sino Metallurgical Equipment (shanghai) Co Ltd
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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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/38—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for roll bodies
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/006—Graphite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

A kind of hot-rolled steel section roll, using trade mark SGA1 material as outer layer, trade mark QT500-5 material is core material, after heat treatment, be outer layer metallographic structure composition change, such as: at case depth 0mm, by 30%~35% carbide, 5%~7% graphite, and the matrix with lamellar structure pearlite, it is changed into 15%~18% carbide, 6%~8% graphite, and the matrix with acinous pearlite and acicular structure.Hot-rolled steel section roll provided by the invention is produced using centrifugal compound compound casting method, the alloy content for greatly improving skin of the roll simultaneously, also further improve the wearability and hot-cracking resistance of product.Through practical rolling, steel transportation amount improves 30% or more, and there is a phenomenon where collapse ring, roll breakage.30% or more roll consumption direct cost is reduced for iron and steel enterprise.

Description

Hot-rolled steel section roll and its preparation method
Technical field
The present invention relates to a kind of components more particularly to a kind of roll for rolling metal for metal manufacture, and its Preparation method.
Background technique
Rolling metal roll, be mounted in pairs on milling train, by bearing support and apply pressure counter-force, by transmission shaft driving and Control velocity of rotation, body of roll pass position directly contact rolled object and are allowed to generate a kind of rolling metal of predetermined plastic deformation Tool.
Hot-rolling roll will bear the common work of cool-hot fatigue, mechanical load, friction, internal stress etc. in rolling process With therefore, there is special requirement to the performance of roll material.
Fig. 1 is the schematic diagram of existing hot-rolled steel channel roll one embodiment under the conditions of rolling operating condition, as shown in Figure 1, rolling Under the action of power P processed, two-piece roller fastens so that the pass on roll shaft is closed, and stocking is plastically deformed under stress to technique The specification of setting.Under the action of twisting resistance W, roll rotation, stocking is continuously plastically deformed, and realizes the rolling of whole steel.Roll Stocking resistance of deformation shows as the rolling reaction force n2 of radial rolling reaction force n1, horizontal direction in pass.
Meanwhile high temperature stocking can also act on roller surface and generate thermal shock, generate in the certain depth of pass surface layer cold Heat fatigue stress.Therefore, in order to guarantee being normally carried out for Rolling Production, it is desirable that roll material meets wearability and (avoids pass Side wall premature abrasion reduces the work roll cooling period), excellent comprehensive mechanical performance (avoiding crumbling too early) and good cold-and-heat resistent The properties such as fatigue capability (avoiding occurring moire shape fire check too early).
At present, it is common to use the trade mark is the material that SGP2 Ni-Cr-Mo indefinite chill spheroidal graphite cast-iron is manufactured as roll, manufacture Method is the first stress relief annealing after static state casting, then is machined.
The metallographic structure feature of obtained roll barrel working lining is: on pearlite matrix, it is distributed with 20%~ 25% ledeburite type carbide and about 5% globular graphite.
The service performance that such metallographic structure can be such that roll has is such as: carbide ensure that the moderate wearability of pass, The body of roll reaches 200 tons~300 tons in the steel transportation amount of No. 12 channel steels (55HSD~60HSD)；Moderate carbide content, makes material With enough toughness, thus have and good anti-collapse ring ability, it is ensured that the continuity of rolling；Possessed content of graphite With stable pearlitic structrure, some cold-and-heat resistent fatigue capabilities of roll are imparted, it can be in 200 tons~300 tons of steel transportation amount, no There is continuous moire shape fire check.
In practice, such roll is had the drawback that: since monoblock cast can only be poured a kind of liquid metals of material, institute If the degree of supercooling of body of roll core and roll neck site fluid metal just will increase to further increase antifriction alloy content, carbon can be made Compound is precipitated, and then the tensile strength of roll neck is greatly reduced, and roll breakage probability is significantly increased.Therefore, it is produced using the above method The space that the wearability of roll has not further increased.This just makes Metallurgical Enterprise further increase operating rate, reduces roller consumption It is extremely difficult.
For this purpose, for a long time, roll manufacturing industry has done many beneficial trials for improving wearability, and most important method is to adopt With centrifugal compound compound casting method (GB/T 15546-1995), by improving outer layer alloys content to improve roll wearability, But after outer layer alloys content increase, the brittleness of material also increases simultaneously, so that the probability for collapsing ring when rolling increases, steel rolling is brought to make The insecurity of industry.Therefore this method is not used.
Up to the present, there are no finding not only add to increase substantially wearability, but can with guarantee do not collapse the heat of ring Roll shaped roll (especially big model channel steel roll) and a kind of reliable manufacturing method.
Summary of the invention
It is an object of the present invention to provide a kind of hot-rolled steel section rolls, have excellent wearability, especially outer layer Wearability.
It is another object of the present invention to provide a kind of hot-rolled steel section rolls, and the brittleness of outer layer is effectively reduced, and have good Well anti-collapses ring ability.
It is yet a further object of the present invention to provide a kind of hot-rolled steel section roll, the tension for further increasing roller neck is strong Degree, prevents the generation of roll breakage accident.
Yet another object of the invention is that a kind of method for producing hot-rolled steel section roll is provided, using centrifugal composite casting Method improves the wearability and hot-cracking resistance of product in the alloy content for greatly improving skin of the roll.
Yet another object of the invention is that providing a kind of method for producing hot-rolled steel section roll, reduces outer layer and contain with height The brittleness of the roll of alloy material is measured, and then solves the problems, such as to be easy to crumble.
A kind of hot-rolled steel section roll provided by the invention, with trade mark SGA1 material (GB/T1504-2008) for outer layer, the trade mark QT500-5 material (GB/T1348-2009) is core material.
A kind of hot-rolled steel section roll provided by the invention, also with trade mark QT500-5 material (GB/T1348-2009) for roll neck Portion.
A kind of hot-rolled steel section roll provided by the invention, after heat treatment, by area, outer layer metallographic structure composition is as follows:
Away from the carbide of case depth 0mm:15%~18% (form such as: netted, strip and bulk), 6%~8% graphite (form such as: spherical or bulk), and the matrix (remaining area) with acinous pearlite and acicular structure；
Away from the carbide of case depth 3mm:16%~20% (form such as: netted, strip and bulk), 6%~8% graphite (form such as: spherical or bulk), and the matrix (remaining area) with acinous pearlite and acicular structure；
Away from the carbide of case depth 8mm:20%~23% (form such as: netted, strip and bulk), 5%~7% graphite (form such as: spherical or bulk), and the matrix (remaining area) with acinous pearlite and acicular structure；
Away from the carbide of case depth 13mm:22%~25% (form such as: netted, strip and bulk), 5%~7% graphite (form such as: spherical or bulk), and the matrix (remaining area) with acinous pearlite and acicular structure.
Hot-rolled steel section roll provided by the invention after heat treatment together with carbide is intermixed with graphite, is wrapped in Matrix.
Hot-rolled steel section roll provided by the invention is deep hole type shaped roll, depth of groove >=50mm.Depth of groove should Understand are as follows: the outer rim annulus radius of pass opening and the difference of pass slot bottom bosom radius.
A method of producing hot-rolled steel section roll of the present invention, comprising:
Using centrifugal compound compound casting method, with trade mark SGA1 material (GB/T1504-2008) for outer layer, the trade mark QT500-5 material (GB/T1348-2009) is core material, and roughing forms pass；
600 DEG C ± 10 DEG C are warming up to 25 DEG C per hour~30 DEG C of speed again, keeps the temperature 2 hours~10 hours；
Then, it is warming up to normalizing temperature (such as: 930 DEG C~1020 DEG C) with 35 DEG C per hour~40 DEG C of speed, heat preservation 10 Hour~20 hours；
Then, it comes out of the stove, after (such as: air is cooling) to surface temperature≤350 DEG C to be cooled；
It melts down, 500 DEG C~550 DEG C tempering is warming up to 25 DEG C per hour~30 DEG C of speed, keep the temperature；
Finally, being come out of the stove with speed slow cooling per hour≤15 DEG C to after≤150 DEG C.
Thermally treated roll, then be made after being finished (such as: pass) and be suitable for the roll finished product that Metallurgical Enterprise uses.
Hot-rolled steel section roll produced by the present invention, the wearability and hot-cracking resistance of product significantly improve.The one of its surface layer In depthkeeping degree, significant change occurs for toughness of material, and plastic deformation ability is obvious, and the brittleness of roll is significantly reduced, and crumbles Problem is addressed.
Compared with prior art, through practical rolling, steel transportation amount improves 30% or more, and do not collapse ring, roll breakage shows As.30% or more roll consumption direct cost is reduced for iron and steel enterprise, by improving operating rate, reduction roll turning number etc., Reducing indirect cost again reduces by 20% or more.
Detailed description of the invention
Fig. 1 is the schematic diagram of existing hot-rolled steel channel roll one embodiment under the conditions of rolling operating condition.
Specific embodiment
Technical solution of the present invention described in detail below.The embodiment of the present invention be merely illustrative of the technical solution of the present invention and It is unrestricted, although being described the invention in detail referring to preferred embodiment, those skilled in the art should understand that, Can with modification or equivalent replacement of the invented technical scheme, without departing from the spirit and scope of the technical solution of the present invention, It should all cover within the scope of the claims of the present invention.
A kind of hot-rolled steel section roll provided in this embodiment, using centrifugal compound compound casting method, with trade mark SGA1 material Matter (GB/T1504-2008) is outer layer, and trade mark QT500-5 material (GB/T1348-2009) is core material, the thickness of outer layer and core material It is accordingly set according to the requirement of product.In addition, also with trade mark QT500-5 material (GB/T1348-2009) for roll neck portion, and slightly add Work forms pass.
The main chemical elements that the material of outer layer contains are as follows:
2.8wt%~3.8wt% carbon (C), 1.0wt~2.5wt% silicon (Si), 0.5wt%~3.0wt% manganese (Mn), 0.5wt%~2.0wt% chromium (Cr), >=0.04wt% magnesium (Mg) and 3.0wt%~10.0wt% nickel (Ni), 3.0wt%~ 10.0wt% molybdenum (Mo), 3.0wt%~10.0wt% vanadium (V), 3.0wt%~10.0wt% neodymium (Nb) and 3.0wt%~ 10.0wt% titanium (Ti).
By area, as-cast structure contains: 30%~35% carbide (form such as: netted, strip and bulk), 5%~ 7% graphite (form such as: spherical and bulk), and the matrix (remaining area) with lamellar structure pearlite.
Its hardness of cast form having is 60HSD~65HSD, and radial stiffness landing is≤0.5HSD/10mm.
The main chemical elements that core material and neck material contain are as follows:
3.0wt%~3.6wt% carbon (C), 2.0wt~2.4wt% silicon (Si), 0.4wt%~0.8wt% manganese (Mn), < 0.2wt% chromium (Cr), 0.5wt%~0.7wt% nickel (Ni), < 0.1wt% molybdenum (Mo) and >=0.04wt% magnesium (Mg).
Its hardness is 35HSD~45HSD, tensile strength >=500Mpa, elongation percentage >=2% and ballistic work >=2J.
Later period reconditioning processing is carried out due to there is oxidation in steel rolling forming process, and to semifinished product, the present embodiment exists When manufacturing roll, pass also stays 5mm~7mm machining allowance.
Using centrifugal compound compound casting method, with trade mark SGA1 material (GB/T1504-2008) for outer layer, the trade mark QT500-5 material (GB/T1348-2009) is core material, and roughing forms pass；
600 DEG C ± 10 DEG C are warming up to 25 DEG C per hour~30 DEG C of speed again, keeps the temperature 2 hours~10 hours；
Then, it is warming up to normalizing temperature (such as: 930 DEG C~1020 DEG C) with 35 DEG C per hour~40 DEG C of speed, heat preservation 10 Hour~20 hours；
Then, it comes out of the stove, after (such as: air is cooling) to surface temperature≤350 DEG C to be cooled；
It melts down, 500 DEG C~550 DEG C tempering is warming up to 25 DEG C per hour~30 DEG C of speed, heat preservation is (such as: in centimeters Roller diameter is measured, measures soaking time in hours, then soaking time is 2 times of roller diameter)；
Finally, being come out of the stove with speed slow cooling per hour≤15 DEG C to after≤150 DEG C.
The outer layer metallographic structure composition of thermally treated roll as shown in table 1, is heat-treated front and back roller surface firmness change Situation is as shown in table 2.
Table 1
Note: every numerical value is equal in table are as follows: area %.
Table 2
In the superficies certain depth (0mm~30mm) of roll, show that obvious become occurs for toughness of material in turning practice Change.When lathe tool is machined to body of roll edge, " flange " phenomenon can all occurs, show the plastic deformation of roll made from the present embodiment Ability is obvious.
It is made after being finished again (such as: pass) and is suitable for the roll finished product that Metallurgical Enterprise uses.Through practical C75 channel steel With C100 channel steel rolling, steel transportation amount improves 30% or more, and there is no collapsing ring, roll breakage.

Claims (13)

1. a kind of hot-rolled steel section roll, it is characterised in that using trade mark SGA1 material as outer layer, trade mark QT500-5 material is core material, After heat treatment, by area, the metallographic structure composition of the outer layer is as follows:
Away from the carbide of case depth 0mm:15%~18%, 6%~8% graphite, and there is acinous pearlite and needle-shaped group The matrix knitted；
Away from the carbide of case depth 3mm:16%~20%, 6%~8% graphite, and there is acinous pearlite and needle-shaped group The matrix knitted；
Away from the carbide of case depth 8mm:20%~23%, 5%~7% graphite, and there is acinous pearlite and needle-shaped group The matrix knitted；
Away from the carbide of case depth 13mm:22%~25%, 5%~7% graphite, and there is acinous pearlite and needle-shaped group The matrix knitted.
2. hot-rolled steel section roll according to claim 1, it is characterised in that also using trade mark QT500-5 material as roll neck Portion.
3. hot-rolled steel section roll according to claim 1, it is characterised in that the roller system deep hole type shaped roll, Depth of groove >=50mm.
4. hot-rolled steel section roll according to claim 1, it is characterised in that the primary chemical that the material of the outer layer contains Element is as follows:
2.8wt%~3.8wt% carbon (C), 1.0wt~2.5wt% silicon (Si), 0.5wt%~3.0wt% manganese (Mn), 0.5wt% ~2.0wt% chromium (Cr), >=0.04wt% magnesium (Mg) and 3.0wt%~10.0wt% nickel (Ni), 3.0wt%~ 10.0wt% molybdenum (Mo), 3.0wt%~10.0wt% vanadium (V), 3.0wt%~10.0wt% neodymium (Nb) and 3.0wt%~ 10.0wt% titanium (Ti).
5. hot-rolled steel section roll according to claim 1, it is characterised in that the hardness of cast form of the outer layer be 60HSD~ 65HSD, radial stiffness landing are≤0.5HSD/10mm.
6. hot-rolled steel section roll according to claim 1, it is characterised in that the as-cast structure of the outer layer contains: 30%~ 35% carbide, 5%~7% graphite, and the matrix with lamellar structure pearlite.
7. hot-rolled steel section roll according to claim 1, it is characterised in that the main chemical elements that the core material contains are such as Under:
3.0wt%~3.6wt% carbon (C), 2.0wt~2.4wt% silicon (Si), 0.4wt%~0.8wt% manganese (Mn), < 0.2wt% chromium (Cr), 0.5wt%~0.7wt% nickel (Ni), < 0.1wt% molybdenum (Mo) and >=0.04wt% magnesium (Mg).
8. hot-rolled steel section roll according to claim 1, it is characterised in that the hardness of the core material is 35HSD~45HSD, Tensile strength >=500Mpa, elongation percentage >=2% and ballistic work >=2J.
9. hot-rolled steel section roll according to claim 1, it is characterised in that the form of the carbide be netted, strip and It is blocky.
10. hot-rolled steel section roll according to claim 1, it is characterised in that the graphite form is spherical and bulk.
11. a kind of method for producing hot-rolled steel section roll described in one of claim 1~10, characterized by comprising:
Using centrifugal compound compound casting method, using trade mark SGA1 material as outer layer, trade mark QT500-5 material is core material, and thick Processing forms pass；
600 DEG C ± 10 DEG C are warming up to 25 DEG C per hour~30 DEG C of speed again, keeps the temperature 2 hours~10 hours；
Then, normalizing temperature is warming up to 35 DEG C per hour~40 DEG C of speed, keeps the temperature 10 hours~20 hours；
Then, it comes out of the stove, after being cooled to surface temperature≤350 DEG C；
It melts down, 500 DEG C~550 DEG C tempering is warming up to 25 DEG C per hour~30 DEG C of speed, keep the temperature；
Finally, being come out of the stove with speed slow cooling per hour≤15 DEG C to after≤150 DEG C.
12. according to the method for claim 11, it is characterised in that the normalizing temperature is 930 DEG C~1020 DEG C.
13. according to the method for claim 11, it is characterised in that the soaking time is 2 times of roller diameter；It is described Soaking time measure in hours, the roller diameter is measured in centimeters.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111778449A (en) * 2020-06-21 2020-10-16 常州市瑞宏轧辊有限公司 Improved ferrite square steel roughing roll and preparation method thereof
CN111778449B (en) * 2020-06-21 2024-03-19 常州市瑞宏轧辊有限公司 Improved ferrite square steel rough roll and preparation method thereof

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