CN114367538A - Working roll of temper mill and manufacturing method thereof - Google Patents
Working roll of temper mill and manufacturing method thereof Download PDFInfo
- Publication number
- CN114367538A CN114367538A CN202111589562.0A CN202111589562A CN114367538A CN 114367538 A CN114367538 A CN 114367538A CN 202111589562 A CN202111589562 A CN 202111589562A CN 114367538 A CN114367538 A CN 114367538A
- Authority
- CN
- China
- Prior art keywords
- percent
- outer layer
- less
- roll
- roller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000003801 milling Methods 0.000 title description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 86
- 229910052742 iron Inorganic materials 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 239000000126 substance Substances 0.000 claims abstract description 11
- 229910001141 Ductile iron Inorganic materials 0.000 claims abstract description 9
- 239000011651 chromium Substances 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- 238000005496 tempering Methods 0.000 claims description 18
- 238000003723 Smelting Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 14
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 13
- 150000002910 rare earth metals Chemical class 0.000 claims description 13
- 239000011777 magnesium Substances 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 238000003754 machining Methods 0.000 claims description 6
- 239000003607 modifier Substances 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 6
- 230000000171 quenching effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 229910052684 Cerium Inorganic materials 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 4
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052749 magnesium Inorganic materials 0.000 claims description 4
- 230000036760 body temperature Effects 0.000 claims description 3
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 claims description 3
- 210000004907 gland Anatomy 0.000 claims description 3
- 239000002054 inoculum Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 239000011162 core material Substances 0.000 claims 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000005266 casting Methods 0.000 description 11
- 238000001816 cooling Methods 0.000 description 11
- 238000013461 design Methods 0.000 description 7
- 229910000604 Ferrochrome Inorganic materials 0.000 description 6
- 229910001309 Ferromolybdenum Inorganic materials 0.000 description 6
- 229910000863 Ferronickel Inorganic materials 0.000 description 6
- 229910000628 Ferrovanadium Inorganic materials 0.000 description 6
- 241001062472 Stokellia anisodon Species 0.000 description 6
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000000956 alloy Substances 0.000 description 4
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- 238000009750 centrifugal casting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
- B21B27/032—Rolls for sheets or strips
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
The invention relates to the technical field of rollers, in particular to a working roller of a temper mill and a manufacturing method thereof, wherein the working roller comprises an outer layer and an inner core, the outer layer is made of high-chromium iron, the inner core is made of ductile iron, a roller sleeve is made of the outer layer and a core part, and the outer layer comprises the following chemical components: 2.1-3.0%, Si: 0.5 to 1.5%, Mn: 0.2 to 1.2 percent of P, less than or equal to 0.10 percent of S, less than or equal to 0.1 percent of S, 10 to 30 percent of Cr, 0.5 to 3.0 percent of Ni, 0.5 to 3.0 percent of Mo, 0.1 to 2.0 percent of V, and the balance of Fe; the chemical components of the core are 2.3-4.0% of C, 1.0-4.0% of Si, 0.1-1.0% of Mn, less than or equal to 0.10% of P, less than or equal to 0.1% of S, less than or equal to 1.0% of Cr, less than or equal to 2.0% of Ni, 0.1-3.0% of Mo and the balance of iron; the invention integrally improves the performance and the quality of the working roll and meets the requirements of the conventional forged steel working roll.
Description
Technical Field
The invention relates to the technical field of rollers, in particular to a working roller of a temper mill and a manufacturing method thereof.
Background
At present, the working roll still uses the forged steel material as the owner in the levelling machine, and is short at the quick-witted time, produces line inefficiency, especially along with steel mill low reaches customer to steel sheet quality requirement higher and higher, level volume progressively increases, and the condition of orange peel appears in the rolling in-process of conventional forged steel material, and the restriction productivity promotes.
The material is promoted gradually to present levelling machine working roll, and high chromium iron contains a large amount of eutectic carbide, and the characteristics that tempering temperature is high have high wear-resisting, high surface quality's characteristic, and combination formula production levelling machine working roll has the advantage of renewable utilization, and simultaneously, combination formula production also provides good convenient condition to roller cover material upgrading.
Disclosure of Invention
The invention aims to design a working roll of a temper mill, which integrally improves the performance and the quality of the working roll and meets the requirements of a conventional forged steel working roll.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a working roll of a temper mill comprises an outer layer and an inner core, wherein the outer layer is made of high-chromium iron, and the inner core is made of nodular iron; the roller shell comprises an outer layer and a core part, wherein the outer layer comprises the following chemical components: 2.1-3.0%, Si: 0.5 to 1.5%, Mn: 0.2 to 1.2 percent of P, less than or equal to 0.10 percent of S, less than or equal to 0.1 percent of S, 10 to 30 percent of Cr, 0.5 to 3.0 percent of Ni, 0.5 to 3.0 percent of Mo, 0.1 to 2.0 percent of V, and the balance of Fe; the chemical components of the core are 2.3-4.0% of C, 1.0-4.0% of Si, 0.1-1.0% of Mn, less than or equal to 0.10% of P, less than or equal to 0.1% of S, less than or equal to 1.0% of Cr, less than or equal to 2.0% of Ni, 0.1-3.0% of Mo and the balance of iron.
The technical scheme of the invention is further improved as follows: the working roll and the roll sleeve are in interference fit, and the interference magnitude is 0.1-1 per thousand.
The technical scheme of the invention is further improved as follows: the thickness of the working layer of the roller sleeve is 20-50 mm.
A method of manufacturing a work roll for a leveler, comprising the steps of:
step A, smelting by a working roll, wherein the outer layer is made of high-chromium iron, and the inner core is made of nodular cast iron; smelting a roller sleeve, and adding chemical components in a set range into the molten iron in the outer layer and the core part;
step B, after the smelting components of the roller sleeve reach the standard, the molten iron on the outer layer and the core part is electrified and heated to the temperature of 1400-1600 ℃, and is discharged, the molten iron is poured when the temperature is reduced to 1250-1400 ℃, a ladle is adopted as the outer layer, a bottom-leakage ladle or ladle is adopted as the core part, the modifier is added into the outer layer along with the flow during pouring, the nodulizer inoculant is added into the molten iron on the core part at the bottom of the ladle, a steel plate gland with the thickness of 10-20mm is adopted above the nodulizer, the periphery of the steel plate is covered by waste steel scraps, and the adding amount of the nodulizer is 1-5%; the amount of molten iron poured into the core part is at least more than 1.6 times of that of molten iron in the outer layer;
step C, opening the box in a cold mode after the roll sleeve is poured for 30-60 hours, and then roughly machining the box after the box is opened in the cold mode, wherein the allowance in the diameter directions of the excircle and the inner hole of the roll body is roughly increased by 5-15mm, and the allowance in the axial direction is 5-200 mm;
d, after the rough adding is finished, quenching and heating the roller body in a high-temperature heat treatment mode and carrying out overall tempering treatment;
e, performing finish machining and detection after the quenching and tempering of the roller sleeve are finished until a finished product is obtained;
and F, performing interference assembly on the roller sleeve and the working roller.
The technical scheme of the invention is further improved as follows: in the step B, the alterant is a mixture of rare earth Mg and NbC, the proportion is 1:1, and the addition amount is less than 0.2%; the nodulizer is one or more of rare earth magnesium and cerium-rich rare earth.
The technical scheme of the invention is further improved as follows: in the step D, the furnace body temperature is 900-.
Compared with the prior art, the invention provides the working roll of the temper mill and the manufacturing method thereof, which have the following beneficial effects:
1. the invention provides a working roll of a temper mill and a manufacturing method thereof.A roll sleeve in the working roll is designed by two layers, the high wear resistance of a working layer is ensured by an outer layer high-chromium iron alloy material, a good tissue morphology is obtained by adding a rare earth Mg modifier and NbC, a core part is made of a ductile iron alloy material, the assembly stress in the later assembly process is ensured to be in a reasonable range, and the manufacturing difficulty is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a photograph of the metallographic structure of the work roll of the leveler of the present invention showing high chromium iron structure on the outer layer, the white phase being carbide and the matrix being gray, showing higher strength.
Detailed Description
As shown in figure 1, the working roll of the planisher comprises an outer layer and an inner core, wherein the outer layer is made of high-chromium iron, and the inner core is made of nodular iron; the roller shell comprises an outer layer and a core part, wherein the outer layer comprises the following chemical components: 2.1-3.0%, Si: 0.5 to 1.5%, Mn: 0.2 to 1.2 percent of P, less than or equal to 0.10 percent of S, less than or equal to 0.1 percent of S, 10 to 30 percent of Cr, 0.5 to 3.0 percent of Ni, 0.5 to 3.0 percent of Mo, 0.1 to 2.0 percent of V, and the balance of Fe; the chemical components of the core are 2.3-4.0% of C, 1.0-4.0% of Si, 0.1-1.0% of Mn, less than or equal to 0.10% of P, less than or equal to 0.1% of S, less than or equal to 1.0% of Cr, less than or equal to 2.0% of Ni, 0.1-3.0% of Mo and the balance of iron;
the working roll and the roll sleeve are in interference fit, and the interference magnitude is 0.1-1 per mill; the thickness of the working layer of the roller sleeve is 20-50 mm.
A method of manufacturing a work roll for a leveler, comprising the steps of:
step A, smelting by a working roll, wherein the outer layer is made of high-chromium iron, and the inner core is made of nodular cast iron; smelting a roller sleeve, and adding chemical components in a set range into the molten iron in the outer layer and the core part;
step B, after the smelting components of the roller sleeve reach the standard, the molten iron on the outer layer and the core part is electrified and heated to the temperature of 1400-1600 ℃, and is discharged, the molten iron is poured when the temperature is reduced to 1250-1400 ℃, a ladle is adopted as the outer layer, a bottom-leakage ladle or ladle is adopted as the core part, the modifier is added into the outer layer along with the flow during pouring, the nodulizer inoculant is added into the molten iron on the core part at the bottom of the ladle, a steel plate gland with the thickness of 10-20mm is adopted above the nodulizer, the periphery of the steel plate is covered by waste steel scraps, and the adding amount of the nodulizer is 1-5%; the amount of molten iron poured into the core part is at least more than 1.6 times of that of molten iron in the outer layer; the modifier is a mixture of rare earth Mg and NbC, the proportion is 1:1, and the addition amount is less than 0.2%; the nodulizer is rare earth magnesium or cerium-rich rare earth, and any one or more of the rare earth magnesium and the cerium-rich rare earth is selected;
step C, opening the box in a cold mode after the roll sleeve is poured for 30-60 hours, and then roughly machining the box after the box is opened in the cold mode, wherein the allowance in the diameter directions of the excircle and the inner hole of the roll body is roughly increased by 5-15mm, and the allowance in the axial direction is 5-200 mm;
d, after the rough adding is finished, quenching and heating the roller body in a high-temperature heat treatment mode and carrying out overall tempering treatment; the high-temperature heat treatment mode comprises the furnace body temperature of 900-.
E, performing finish machining and detection after the quenching and tempering of the roller sleeve are finished until a finished product is obtained;
and F, performing interference assembly on the roller sleeve and the working roller.
The roll sleeve in the working roll is designed in two layers, the high wear resistance of the working layer is ensured by the high-chromium iron alloy material of the outer layer, the good structure appearance is obtained by adding the rare earth Mg modifier and the NbC, the core part is made of the ductile iron alloy material, and the assembly stress in the later assembly process is ensured to be in a reasonable range; the working roll body of the temper mill is long, the manufacturing difficulty of the working roll body is far higher than that of the conventional roll collar, and the manufacturing difficulty is greatly reduced by the method.
The present invention will be described in further detail with reference to the following examples:
example 1
The roll sleeve of the working roll uses scrap steel, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum and electrode powder as raw materials, adopts an intermediate frequency furnace to smelt, and reaches the range of design components: the outer layer molten iron comprises 2.33% of C, 0.85% of Si, 0.9% of Mn0.05%, 0.06% of S, 20.56% of Cr20.98%, 0.98% of Ni0.85%, 1.01% of V, 0.5% of W and the balance of Fe; 3.05 percent of core molten iron C, 1.36 percent of Si, 0.95 percent of Mn0.06 percent of P, 0.07 percent of S, 0.03 percent of Cr0.12 percent of Ni0.12 percent of Mo0.3 percent of Fe, and the balance of Fe. The outer layer is smelted at 1510 ℃, the temperature is raised to 1530 ℃ after the components reach the standard, then the outer layer is discharged from the furnace and centrifugally cast, the smelting temperature of the molten steel in the core part is 1490 ℃, the casting temperature is 1510 ℃, the casting water amount in the outer layer is 2.1t, and the casting water amount in the core part is 4.5 t. And after the pouring is finished, opening the box in a cooling mode within 39h, roughly adding 25mm of axial allowance and 12mm of radial diameter allowance, heating at 980 ℃ for 230min, air cooling for 2.5h until the roller body is 431 ℃, charging and tempering for 35h, and tempering for 2 times. And after the roller sleeve is processed to a finished product, the roller sleeve is in interference fit with a working roller, the inner diameter of the roller sleeve is 625.03mm, and the inner diameter of a roller shaft is 625.56 mm.
Example 2
The roll sleeve of the working roll uses scrap steel, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum and electrode powder as raw materials, adopts an intermediate frequency furnace to smelt, and reaches the range of design components: the outer layer molten iron comprises 2.33% of C, 0.85% of Si, 0.9% of Mn0.05%, 0.06% of S, 20.56% of Cr20.98%, 0.98% of Ni0.85%, 1.01% of V, 0.5% of W and the balance of Fe; 3.05 percent of core molten iron C, 1.36 percent of Si, 0.95 percent of Mn0.06 percent of P, 0.07 percent of S, 0.03 percent of Cr0.12 percent of Ni0.12 percent of Mo0.3 percent of Fe, and the balance of Fe. The outer layer is smelted at 1510 ℃, the temperature is raised to 1530 ℃ after the components reach the standard, then the outer layer is discharged from the furnace and centrifugally cast, the smelting temperature of the molten steel in the core part is 1490 ℃, the casting temperature is 1510 ℃, the casting water amount in the outer layer is 2.1t, and the casting water amount in the core part is 4.5 t. And after the pouring is finished, opening the box in a cooling mode within 39h, roughly adding 25mm of axial allowance and 12mm of radial diameter allowance, heating at 980 ℃ for 230min, air cooling for 2.5h until the roller body is 431 ℃, charging and tempering for 35h, and tempering for 2 times. And after the roller sleeve is processed to a finished product, the roller sleeve is in interference fit with a working roller, the inner diameter of the roller sleeve is 625.00mm, and the inner diameter of a roller shaft is 625.55 mm.
Example 3
The roll sleeve of the working roll uses scrap steel, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum and electrode powder as raw materials, adopts an intermediate frequency furnace to smelt, and reaches the range of design components: outer molten iron C2.81%, Si 0.89%, Mn0.92%, P0.06%, S0.07%, Cr22.36%, Ni1.32%, Mo0.99%, V1.03%, W0.45%, and the balance of Fe; 3.12% of core molten iron C, 1.31% of Si, 0.91% of Mn0.05%, 0.06% of S, 0.01% of Cr0.11% of Ni0.2% of Mo0.2% of the balance Fe. Smelting the outer layer at 1520 deg.C, heating to 1535 deg.C after the components reach the standard, discharging, and centrifuging to cast, wherein the core molten steel smelting temperature is 1485 deg.C, the casting temperature is 1505 deg.C, the outer layer casting water amount is 1.9t, and the core casting water amount is 4.3 t. And after the pouring is finished, opening the box in a cooling mode for 35 hours, roughly adding the axial allowance of 23mm, keeping the axial allowance of 11mm in the radial diameter direction, heating for 220min at 1000 ℃, air-cooling for 2.3 hours until the roller body is 436 ℃, charging and tempering for 32 hours, and tempering for 2 times. And after the roller sleeve is processed to a finished product, the roller sleeve is in interference fit with a working roller, the inner diameter of the roller sleeve is 625.05mm, and the inner diameter of a roller shaft is 625.53 mm.
Example 4
The roll sleeve of the working roll uses scrap steel, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum and electrode powder as raw materials, adopts an intermediate frequency furnace to smelt, and reaches the range of design components: outer molten iron C2.75%, Si 0.81%, Mn0.81%, P0.03%, S0.04%, Cr19.87%, Ni1.12%, Mo0.95%, V1.01%, W0.41%, and the balance of Fe; 3.10% of core molten iron C, 1.25% of Si, 0.83% of Mn0.02% of P, 0.03% of S, 0.02% of Cr0.02%, 0.08% of Ni0.1% of Mo0.1% and the balance of Fe. The outer layer is smelted at 1511 ℃, the temperature is raised to 1521 ℃ after the components reach the standard, then the outer layer is discharged from the furnace for centrifugal casting, the smelting temperature of the molten steel in the core part is 1480 ℃, the casting temperature is 1501 ℃, the pouring water amount of the outer layer is 1.85t, and the pouring water amount of the core part is 4.1 t. And after the pouring is finished, opening the box in a cooling mode for 33h, roughly adding the axial allowance of 16mm, keeping the axial allowance of 9mm in the radial diameter direction, heating for 205min at 1011 ℃, air-cooling for 2.5h until the roller body is 431 ℃, charging and tempering for 31h, and tempering for 2 times. And after the roller sleeve is processed to a finished product, the roller sleeve is in interference fit with a working roller, the inner diameter of the roller sleeve is 625.02mm, and the inner diameter of a roller shaft is 625.49 mm.
Example 5
The roll sleeve of the working roll uses scrap steel, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum and electrode powder as raw materials, adopts an intermediate frequency furnace to smelt, and reaches the range of design components: outer molten iron C2.71%, Si 0.78%, Mn0.79%, P0.01%, S0.03%, Cr19.25%, Ni1.05%, Mo0.91%, V1.15%, W0.10%, and the balance of Fe; 3.35% of core molten iron C, 1.22% of Si, 0.81% of Mn0.03%, 0.05% of S, 0.08% of Cr0.08%, 0.06% of Ni0.09%, and the balance of Fe. The outer layer is smelted at 1501 ℃, the temperature is raised to 1516 ℃ after the components reach the standard, the outer layer is taken out of the furnace and centrifugally poured, the smelting temperature of the molten steel of the core part is 1483 ℃, the pouring temperature is 1512 ℃, the pouring water amount of the outer layer is 1.89t, and the pouring water amount of the core part is 4.25 t. And after the pouring is finished, opening the box in a cooling mode for 35 hours, roughly adding 19mm of axial allowance and 10mm of radial diameter allowance, heating for 207min at the temperature of 1019 ℃, air cooling for 2.8 hours until the roller body is subjected to charging at the temperature of 439 ℃, tempering for 36 hours, and tempering for 2 times. And after the roller sleeve is processed to a finished product, the roller sleeve is in interference fit with a working roller, the inner diameter of the roller sleeve is 625.12mm, and the inner diameter of a roller shaft is 625.65 mm.
Example 6
The roll sleeve of the working roll uses scrap steel, ferronickel, ferrovanadium, ferrochromium, ferromolybdenum and electrode powder as raw materials, adopts an intermediate frequency furnace to smelt, and reaches the range of design components: outer molten iron C2.79%, Si 0.75%, Mn0.78%, P0.02%, S0.06%, Cr19.26%, Ni1.08%, Mo0.89%, V1.01%, W0.15%, and the balance of Fe; 3.36% of core molten iron C, 1.29% of Si, 0.83% of Mn0.04% of P, 0.06% of S, 0.09% of Cr0.07% of Ni0.07%, 0.12% of Mo0, and the balance of Fe. The outer layer is smelted at the temperature of 1509 ℃, the temperature is raised to 1513 ℃ after the components reach the standard, then the molten steel is taken out of the furnace for centrifugal casting, the smelting temperature of the molten steel of the core part is 1483 ℃, the casting temperature is 1509 ℃, the pouring water amount of the outer layer is 1.79t, and the pouring water amount of the core part is 4.03. And after the pouring is finished, opening the box after 39h, roughly adding 21mm of axial allowance and 11mm of radial diameter allowance, heating for 201min at 1018 ℃, air cooling for 2.6h until the roll body is charged at 433 ℃, and tempering for 37h and 2 times. And after the roller sleeve is processed to a finished product, the roller sleeve is in interference fit with a working roller, the inner diameter of the roller sleeve is 625.09mm, and the inner diameter of a roller shaft is 625.69 mm.
Example 7
Example 7 is a control, conventional forged steel work roll.
The products of the embodiments 1 to 7 are taken to carry out the tensile mechanical property detection of the sample, and the detection result of the national standard GB/T228 of the performance detection is shown in the table 1.
Table 1 EXAMPLES Performance test results
By the manufacturing method of the working roll of the leveler, the wear resistance of the combined leveler working roll reaches more than 2 times of that of the conventional forged steel working roll.
According to the performance detection result, the method for manufacturing the working roll of the leveling machine can be well adapted to the working condition characteristics of the leveling machine frame in the actual use process, and particularly can obviously improve the service life of the roll.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the appended claims.
Claims (6)
1. The utility model provides a work roll of levelling machine, includes skin and inner core, and outer material is high chromium iron, and the inner core material is nodular cast iron, its characterized in that: the roller shell comprises an outer layer and a core part, wherein the outer layer comprises the following chemical components: 2.1-3.0%, Si: 0.5 to 1.5%, Mn: 0.2 to 1.2 percent of P, less than or equal to 0.10 percent of S, less than or equal to 0.1 percent of S, 10 to 30 percent of Cr, 0.5 to 3.0 percent of Ni, 0.5 to 3.0 percent of Mo, 0.1 to 2.0 percent of V, and the balance of Fe; the chemical components of the core are 2.3-4.0% of C, 1.0-4.0% of Si, 0.1-1.0% of Mn, less than or equal to 0.10% of P, less than or equal to 0.1% of S, less than or equal to 1.0% of Cr, less than or equal to 2.0% of Ni, 0.1-3.0% of Mo and the balance of iron.
2. The work roll of a leveling machine as set forth in claim 1, wherein: the working roll and the roll sleeve are in interference fit, and the interference magnitude is 0.1-1 per thousand.
3. The work roll of a leveling machine as set forth in claim 1, wherein: the thickness of the working layer of the roller sleeve is 20-50 mm.
4. A method of manufacturing a work roll for a leveler, comprising the steps of:
step A, smelting by a working roll, wherein the outer layer is made of high-chromium iron, and the inner core is made of nodular cast iron; smelting a roller sleeve, and adding chemical components in a set range into the molten iron in the outer layer and the core part;
step B, after the smelting components of the roller sleeve reach the standard, the molten iron on the outer layer and the core part is electrified and heated to the temperature of 1400-1600 ℃, and is discharged, the molten iron is poured when the temperature is reduced to 1250-1400 ℃, a ladle is adopted as the outer layer, a bottom-leakage ladle or ladle is adopted as the core part, the modifier is added into the outer layer along with the flow during pouring, the nodulizer inoculant is added into the molten iron on the core part at the bottom of the ladle, a steel plate gland with the thickness of 10-20mm is adopted above the nodulizer, the periphery of the steel plate is covered by waste steel scraps, and the adding amount of the nodulizer is 1-5%; the amount of molten iron poured into the core part is at least more than 1.6 times of that of molten iron in the outer layer;
step C, opening the box in a cold mode after the roll sleeve is poured for 30-60 hours, and then roughly machining the box after the box is opened in the cold mode, wherein the allowance in the diameter directions of the excircle and the inner hole of the roll body is roughly increased by 5-15mm, and the allowance in the axial direction is 5-200 mm;
d, after the rough adding is finished, quenching and heating the roller body in a high-temperature heat treatment mode and carrying out overall tempering treatment;
e, performing finish machining and detection after the quenching and tempering of the roller sleeve are finished until a finished product is obtained;
and F, performing interference assembly on the roller sleeve and the working roller.
5. The method of manufacturing a work roll of a leveling machine in accordance with claim 4, wherein: in the step B, the alterant is a mixture of rare earth Mg and NbC, the proportion is 1:1, and the addition amount is less than 0.2%; the nodulizer is one or more of rare earth magnesium and cerium-rich rare earth.
6. The method of manufacturing a work roll of a leveling machine in accordance with claim 4, wherein: in the step D, the furnace body temperature is 900-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111589562.0A CN114367538A (en) | 2021-12-23 | 2021-12-23 | Working roll of temper mill and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111589562.0A CN114367538A (en) | 2021-12-23 | 2021-12-23 | Working roll of temper mill and manufacturing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114367538A true CN114367538A (en) | 2022-04-19 |
Family
ID=81140415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111589562.0A Pending CN114367538A (en) | 2021-12-23 | 2021-12-23 | Working roll of temper mill and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114367538A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4433032A (en) * | 1979-10-26 | 1984-02-21 | Kubota Ltd. | High chrome work roll |
| JPH11285710A (en) * | 1998-04-06 | 1999-10-19 | Nippon Steel Corp | Composite work roll for cold rolling and its manufacture |
| CN1769508A (en) * | 2005-11-10 | 2006-05-10 | 西安交通大学 | Low cost, high-wearability hypereutectic high chromium cast iron and its production method |
| WO2015075771A1 (en) * | 2013-11-19 | 2015-05-28 | 新日鐵住金株式会社 | Steel sheet |
| CN106086644A (en) * | 2016-06-23 | 2016-11-09 | 合肥巍华智能停车设备有限公司 | The vapour vehicle component that a kind of noise reduction acoustically effective is good |
| CN106103766A (en) * | 2014-03-12 | 2016-11-09 | 斗山英维高株式会社 | Heat-resistant spheroidal graphite cast iron, its manufacture method and comprise its engine exhaust system |
| CN106222530A (en) * | 2016-08-30 | 2016-12-14 | 江苏共昌轧辊股份有限公司 | A kind of centrifugal casting rich chromium cast iron collars and preparation method |
| CN112322970A (en) * | 2020-10-14 | 2021-02-05 | 河北津西钢铁集团重工科技有限公司 | High-chromium steel composite roll collar and manufacturing method thereof |
| CN112743064A (en) * | 2020-12-29 | 2021-05-04 | 唐山先隆轧辊实业有限公司 | High-nitrogen high-speed steel centrifugal composite roller and preparation process thereof |
| WO2021194437A1 (en) * | 2020-03-26 | 2021-09-30 | Entil Endustri Yatirimlari Ve Ticaret Anonim Sirketi | Multi-layered roller with high corrosion resistance |
| CN113523201A (en) * | 2021-06-15 | 2021-10-22 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-wear-resistance nodular cast iron roller for hot continuous rolling and steckel mill |
| CN113547099A (en) * | 2021-06-11 | 2021-10-26 | 中钢集团邢台机械轧辊有限公司 | Preparation method of rough-rolled high-speed steel working roll for full-endless rolling of sheet billet |
-
2021
- 2021-12-23 CN CN202111589562.0A patent/CN114367538A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4433032A (en) * | 1979-10-26 | 1984-02-21 | Kubota Ltd. | High chrome work roll |
| JPH11285710A (en) * | 1998-04-06 | 1999-10-19 | Nippon Steel Corp | Composite work roll for cold rolling and its manufacture |
| CN1769508A (en) * | 2005-11-10 | 2006-05-10 | 西安交通大学 | Low cost, high-wearability hypereutectic high chromium cast iron and its production method |
| WO2015075771A1 (en) * | 2013-11-19 | 2015-05-28 | 新日鐵住金株式会社 | Steel sheet |
| CN106103766A (en) * | 2014-03-12 | 2016-11-09 | 斗山英维高株式会社 | Heat-resistant spheroidal graphite cast iron, its manufacture method and comprise its engine exhaust system |
| CN106086644A (en) * | 2016-06-23 | 2016-11-09 | 合肥巍华智能停车设备有限公司 | The vapour vehicle component that a kind of noise reduction acoustically effective is good |
| CN106222530A (en) * | 2016-08-30 | 2016-12-14 | 江苏共昌轧辊股份有限公司 | A kind of centrifugal casting rich chromium cast iron collars and preparation method |
| WO2021194437A1 (en) * | 2020-03-26 | 2021-09-30 | Entil Endustri Yatirimlari Ve Ticaret Anonim Sirketi | Multi-layered roller with high corrosion resistance |
| CN112322970A (en) * | 2020-10-14 | 2021-02-05 | 河北津西钢铁集团重工科技有限公司 | High-chromium steel composite roll collar and manufacturing method thereof |
| CN112743064A (en) * | 2020-12-29 | 2021-05-04 | 唐山先隆轧辊实业有限公司 | High-nitrogen high-speed steel centrifugal composite roller and preparation process thereof |
| CN113547099A (en) * | 2021-06-11 | 2021-10-26 | 中钢集团邢台机械轧辊有限公司 | Preparation method of rough-rolled high-speed steel working roll for full-endless rolling of sheet billet |
| CN113523201A (en) * | 2021-06-15 | 2021-10-22 | 中钢集团邢台机械轧辊有限公司 | Preparation method of high-wear-resistance nodular cast iron roller for hot continuous rolling and steckel mill |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113523201A (en) | Preparation method of high-wear-resistance nodular cast iron roller for hot continuous rolling and steckel mill | |
| CN105618715B (en) | A kind of wear-resistant high speed steel composite roll and preparation method thereof | |
| CN103088249B (en) | Abrasion-resistant alloy cast iron material with high hardness for chute lining plate, and preparation method thereof | |
| CN113547099A (en) | Preparation method of rough-rolled high-speed steel working roll for full-endless rolling of sheet billet | |
| CN101487103B (en) | Vanadium niobium composite alloying cold working die steel and preparation thereof | |
| CN114351032B (en) | Preparation method of high-material vertical roll | |
| CN104148399A (en) | Wear-resisting roll used for steel rolling intermediate mill frame and manufacturing method thereof | |
| CN103602920B (en) | A kind of method of manufacturing technology of bearing steel and anti-friction bearing | |
| CN102517522A (en) | Steel for hydraulic piece and manufacturing method for steel | |
| CN106086668A (en) | A kind of high-performance high speed stamping cold work die steel and preparation method thereof | |
| CN110257717A (en) | A kind of machine bearing lasso high-end bearing steel material and its manufacturing method | |
| CN104438337B (en) | A kind of abrasion-resistant roller for cold rolling of strip steel and preparation method thereof | |
| CN107475641A (en) | High-speed steel roll and preparation method thereof | |
| CN102371273B (en) | Improved high-chromium iron roller and production method thereof | |
| CN112322970A (en) | High-chromium steel composite roll collar and manufacturing method thereof | |
| CN109735777A (en) | A kind of anti-oxidant hot die steel and preparation method thereof | |
| CN108754068A (en) | High pre- finish rolling high speed steel roll collar of line and preparation method thereof | |
| CN112853195A (en) | Method for preparing hot continuous rolling and steckel mill ductile iron rough rolling working roll | |
| CN107034411A (en) | A kind of abrasion-resistant roller and preparation method thereof | |
| CN109680122A (en) | A kind of hub bearing steel and its manufacturing method | |
| CN114346197A (en) | Preparation method of anti-surface-roughness roller for medium plate rolling mill | |
| CN105463333B (en) | A kind of liner plate forging mold steel, liner plate forging mold and preparation method thereof | |
| CN107574359A (en) | A kind of low-alloy composite roll and its manufacture method | |
| CN109594018B (en) | Centrifugal casting high-speed steel pinch roll and manufacturing method thereof | |
| CN106191646A (en) | A kind of high-quality cylinder jacket and preparation method thereof and ferroalloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |