CN113523242A - Manufacturing method of high-boron high-speed steel centrifugal composite roller - Google Patents
Manufacturing method of high-boron high-speed steel centrifugal composite roller Download PDFInfo
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- CN113523242A CN113523242A CN202110705629.6A CN202110705629A CN113523242A CN 113523242 A CN113523242 A CN 113523242A CN 202110705629 A CN202110705629 A CN 202110705629A CN 113523242 A CN113523242 A CN 113523242A
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- 229910000997 High-speed steel Inorganic materials 0.000 title claims abstract description 69
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 89
- 238000010438 heat treatment Methods 0.000 claims abstract description 48
- 238000003723 Smelting Methods 0.000 claims abstract description 41
- 229910052742 iron Inorganic materials 0.000 claims abstract description 37
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 14
- 238000005266 casting Methods 0.000 claims description 39
- 238000001816 cooling Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 23
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 238000000465 moulding Methods 0.000 claims description 14
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 12
- 150000002910 rare earth metals Chemical class 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 10
- 239000011651 chromium Substances 0.000 claims description 9
- 238000005121 nitriding Methods 0.000 claims description 8
- 229910000600 Ba alloy Inorganic materials 0.000 claims description 7
- 238000009750 centrifugal casting Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 7
- -1 silicon-aluminum-barium Chemical compound 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 5
- APGROBRHKCQTIA-UHFFFAOYSA-N [Mg].[Si].[Fe] Chemical compound [Mg].[Si].[Fe] APGROBRHKCQTIA-UHFFFAOYSA-N 0.000 claims description 5
- 238000011081 inoculation Methods 0.000 claims description 5
- 239000002054 inoculum Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 150000004767 nitrides Chemical class 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 2
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical group [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims 1
- 238000005096 rolling process Methods 0.000 abstract description 14
- 238000005520 cutting process Methods 0.000 abstract description 9
- 239000011159 matrix material Substances 0.000 abstract description 5
- 238000007493 shaping process Methods 0.000 abstract 1
- 230000005484 gravity Effects 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- 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
- B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
- B22D19/085—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal of anti-frictional metal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
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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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
-
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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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
Abstract
A centrifugal composite roller for high-boron high-speed steel is made up through such technological steps as shaping, smelting, pouring, opening box, heat treatment, adding ferroboron to smelting furnace before molten iron is taken out of furnace, adding a certain amount of alloy nitridizing agent while taking out of furnace, pouring primary core after external layer is poured in for a certain time, and pouring molten iron in core after box is closed. The manufacturing process reduces labor intensity and saves production cost; the strength of the high-speed steel roller matrix is improved; the use problem of the traditional high-speed steel roller in the bar cutting machine frame is solved, and the rolling environment of the bar cutting machine frame is adapted.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a manufacturing method of a high-boron high-speed steel centrifugal composite roller.
Background
The high-speed steel roll contains a large amount of alloy elements such as V, W, Cr, Mo, Nb and the like, has high normal-temperature hardness HS 82-90, has the characteristic of good high-temperature red hardness, and can still ensure the hardness of more than HS78 at the temperature of more than 500 ℃, so the high-speed steel roll has excellent high-temperature wear resistance and is widely applied to steel rolling production at present. The high-speed steel roll is used for replacing a semi-steel roll, a high-chromium cast iron roll, a high-nickel-chromium-molybdenum infinite chilled roll and a needle-shaped bainite ductile iron roll, and good effects are achieved in production practice for improving rolling quantity and prolonging roll changing period.
Due to the particularity of the high-speed steel roll material, the requirement on the rolling environment is relatively high, when the slitting rolling is adopted in a bar mill finish rolling section rack, the rolling environment of the slitting rack is particularly severe, the high-speed steel roll cannot obtain a good using effect, and the traditional bainite ductile iron material is still used mostly at present. The matrix strength of the high-speed steel roller is improved, crystal grains are refined, the rolling environment of a bar mill cutting rack is overcome, and the high-speed steel roller is suitable for rolling of the cutting rack.
The high-speed steel roll is a composite roll, and the casting method of the high-speed steel roll is a common overflow method for replacing unsolidified hard molten metal at the core part in the roll solidification process by soft and tough molten metal, but the process has high labor intensity and high cost, is influenced by an overflow production mode, has higher chromium content and higher stress at the roll neck, and is easy to have fracture accidents during the use process; meanwhile, the thickness of the outer working layer is flushed by overflowing molten iron, and the use of a user cannot be met individually.
Disclosure of Invention
The invention aims to provide a production method of a high-boron high-speed steel centrifugal composite roller suitable for a bar cutting machine frame, which is used for improving the matrix strength of the high-speed steel roller, refining crystal grains, overcoming the rolling environment of a bar rolling mill cutting frame and adapting to the rolling of the cutting machine frame.
In order to achieve the purpose, the invention adopts the technical scheme that:
a technology for manufacturing the centrifugal composite roller of high-boron high-speed steel includes such steps as moulding, smelting, pouring, opening box, heat treatment, adding ferroboron to the smelting furnace before the molten iron on the external layer of high-speed steel is discharged, adding a certain amount of alloy nitride, pouring primary core after external layer is poured for a certain time, and pouring molten iron on core after box is closed.
The technical scheme of the invention is further improved as follows: the composite roll comprises the following chemical components in percentage by weight: c: 1.2-2.2, Cr: 7.0 to 13.5, Ni: 0.2 to 1.2, Mo: 0.5-1.5, V: 1.0-2.5, W: 1.0 to 2.5, Nb: 1.0-3.0, Re: 0.05-0.1, P is less than or equal to 0.04, S is less than or equal to 0.04, Mn is less than or equal to 0.5, Si: 0.6-1.5, B: 0.05-0.5, and the balance of Fe; smelting primary core semi-steel, wherein the chemical components in percentage by weight are as follows: c: 1.0-1.5, Cr + Mo + V + W: 0.01-0.15, Re: 0.1, P is less than or equal to 0.03, S is less than or equal to 0.03, Mn: 0.3 to 0.8, Si: 1.1-1.8, and the balance of Fe; smelting nodular cast iron at the core part of the secondary core, wherein the nodular cast iron comprises the following chemical components in percentage by weight: c: 2.9-3.6, Cr: 0.1 to 0.5, Ni: 0.2-0.8, Re: 0.1, P is less than or equal to 0.03, S is less than or equal to 0.02, Mn: 0.3 to 1.0, Si: 1.3-2.0, and the balance Fe.
A manufacturing method of a high-boron high-speed steel centrifugal composite roller is characterized by comprising the following manufacturing steps:
s1, molding, wherein the casting box comprises an end cover, a roller body molding box and a journal molding box, the journal molding box comprises a bottom box and a dead head molding box, and the roller body part adopts metal mold spray coating; the shaft neck is molded by water glass, a curing agent and silica sand, and the surface of the shaft neck is brushed with alcohol-based paint; the end cover is molded by silica sand and clay, and the bottom of the bottom box is closed;
s2, smelting in an intermediate frequency furnace, and respectively carrying out high-speed steel outer layer smelting, primary core semisteel smelting and secondary core nodular cast iron smelting;
s3, respectively treating the outer layer of the high-speed steel, the primary core and the molten iron of the secondary core, adding ferroboron into the high-speed steel before the outer layer of the high-speed steel is discharged out of the furnace, adding 0.1-0.5% of silicon-aluminum-barium alloy into the furnace before the primary core is discharged out of the furnace, and carrying out spheroidizing inoculation on the nodular cast iron of the secondary core;
s4, when the outer layer of the high-speed steel is discharged, adding 0.2-0.6% of rare earth and 0.3-1.5% of nitriding alloy agent into the ladle for treatment;
s5, centrifugal casting, under centrifugal force, casting the high-speed steel working layer, casting the primary core after a period of time,
stopping when the casting layer is cooled to 1100-1150 ℃, and performing box closing operation;
s6, casting the secondary core part after mould assembling, and casting the spheroidized molten iron of the secondary core part;
and S7, cooling to normal temperature, opening the box, roughly heating and then carrying out heat treatment.
The technical scheme of the invention is further improved as follows: the alloy nitriding agent is chromium nitride.
The technical scheme of the invention is further improved as follows: in step S5, the core is poured once after 5 minutes of outer layer pouring.
The technical scheme of the invention is further improved as follows: in the step S3, the adding amount of ferroboron is 1% -2%, the nodulizer used in the nodulizing treatment is rare earth magnesium silicon iron alloy, the adding amount is 1.0-1.6%, the inoculant is 75 ferrosilicon, and the adding amount is 0.4-1.0%.
The technical scheme of the invention is further improved as follows: procedure of heat treatment in step S7: heating to 1000-1120 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 2-4 h, cooling to 400-450 ℃ at a speed of 130-140 ℃/h, raising the temperature to 500-550 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 10-32 h, lowering the temperature to room temperature at a cooling speed of 20-30 ℃/h, raising the temperature to 500-550 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 10-32 h, taking out of the furnace, and air cooling to room temperature.
The technical scheme of the invention is further improved as follows: step S3, adding silicon-aluminum-barium alloy into the primary core before tapping for treatment, wherein the reaction temperature is 1580-; and step S4, adding 0.2-0.6% of rare earth and alloy nitride agent into the outer high-speed steel layer package for treatment, wherein the reaction temperature is 1550-1650 ℃.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the addition of ferroboron and alloy nitride agent purifies molten steel, refines crystal grains and improves the strength of the high-speed steel roll matrix; the cast high-speed steel roller can be well suitable for a bar mill slitting rack.
The manufacturing process reduces labor intensity and saves production cost; the strength of the high-speed steel roller matrix is improved; the use problem of the traditional high-speed steel roller in the bar cutting machine frame is solved, and the rolling environment of the bar cutting machine frame is adapted. After the technical scheme is adopted, the outer layer molten iron corrosion amount is 10-15mm, and the outer layer molten iron corrosion amount is 20-30mm in an overflow mode, so that the use requirements of users can be completely met.
Detailed Description
The present invention is further illustrated by the following examples.
Example 1
A technology for manufacturing the centrifugal composite roller of high-boron high-speed steel bar includes such steps as moulding, smelting, pouring, opening box and heat treatment.
1. Molding, wherein the roller body part adopts metal mold spray coating; the shaft neck is molded by water glass, a curing agent and silica sand, and the surface of the shaft neck is brushed with alcohol-based paint; the end cap is molded with silica sand or clay.
2. Smelting in a medium-power frequency furnace, and smelting molten steel on the outer layer of the roller at the smelting temperature of 1500-1650 ℃, wherein the smelting temperature is 1.2C, 13.5Cr, 0.2Ni, 1.5Mo, 1.0V, 1.0W, 1.0Nb, 0.1Re, P is less than or equal to 0.04, S is less than or equal to 0.04, Mn is less than or equal to 0.5, 0.6Si, 0.5B, and the balance of Fe.
Smelting the primary core semi-steel at 1580-1650 ℃, wherein the smelting temperature is 1.0C, 0.15Cr + Mo + V + W, 0.1Re, less than or equal to 0.03P, less than or equal to 0.03S, 0.3-0.8 Mn0.1 Si, and the balance Fe.
And smelting the nodular cast iron at the secondary core part at 1500-1650 ℃, wherein the smelting temperature is 2.9 ℃ C, 0.5Cr, 0.2Ni, 0.1Re, less than or equal to 0.03 percent of P, less than or equal to 0.02 percent of S, 1.0Mn, 2.0Si and the balance Fe.
3. Respectively treating molten iron of the outer layer, the primary core and the secondary core of the high-speed steel, adding ferroboron into a furnace before the outer layer of the high-speed steel is discharged, wherein the adding amount of the ferroboron is 1%, and when the outer layer of the high-speed steel is discharged, 0.2% of rare earth and 1.5% of nitriding alloy agent are added into the outer layer of the high-speed steel for treatment, and the reaction temperature is 1550-1650 ℃; 0.1 percent of silicon-aluminum-barium alloy is added into the primary core before the primary core is taken out of the furnace, and the reaction temperature is 1580 and 1650 ℃; spheroidizing inoculation is carried out on the secondary core nodular cast iron, the nodulizer is rare earth magnesium silicon iron alloy, the adding amount is 1.6%, the inoculant is 75 silicon iron, the adding amount is 1.0%, and the reaction temperature is 1500-1600 ℃;
4. and (3) centrifugal casting, namely casting the outer layer of the high-speed steel roll at the casting temperature of 1420-1480 ℃ under the centrifugal force, wherein the centrifugal gravity multiple is 50G, and casting the primary core after 5 minutes.
5. Pouring the secondary core part, namely, combining the casting and the roll neck mold in the last step, requiring the centrifuge to stop rotating until the molten iron of the cast core part is controlled within 7 minutes after the combination of the mold, and statically pouring the molten iron of the spheroidized secondary core nodular cast iron in the step 2 at the pouring temperature of 1400-1550 ℃;
6. cooling to 200-320 ℃ at normal temperature, opening a box, carrying out rough heating and post-heat treatment, heating to 1000-1120 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 2-4 h, cooling to 400-450 ℃ at a speed of 130-140 ℃/h after discharging, heating to 500-550 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 10-32 h, cooling to room temperature at a cooling speed of 20-30 ℃/h, heating to 500-550 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 10-32 h, discharging, and air cooling to room temperature.
Example 2
This example differs from example 1 in that:
smelting in a medium-power frequency furnace, wherein the smelting temperature of molten steel at the outer layer of the roller is 1500-1650 ℃, the smelting temperature is 2.2C, 7.0Cr, 0.2Ni, 0.5Mo, 2.5V, 1.0W, 3.0Nb, 0.05Re, P is less than or equal to 0.04, S is less than or equal to 0.04, Mn is less than or equal to 0.5, 1.5Si, 0.05B, and the balance is Fe.
The smelting temperature of the semi-steel of the primary core part is 1580-1650 ℃, the weight percentage of chemical components is 1.5C, 0.01Cr + Mo + V + W, 0.1Re, P is less than or equal to 0.03, S is less than or equal to 0.03, Mn0.8, 1.8Si, and the balance is Fe.
Smelting nodular cast iron at 1500-1650 deg.C, wherein the smelting temperature is 3.6C, 0.1Cr, 0.8Ni, 0.1Re, P is less than or equal to 0.03, S is less than or equal to 0.02, Mn0.3, 1.3Si, and the balance Fe
Respectively treating molten iron of the outer layer, the primary core and the secondary core of the high-speed steel, adding ferroboron into a furnace before the outer layer of the high-speed steel is discharged, wherein the adding amount of the ferroboron is 2%, and when the outer layer of the high-speed steel is discharged, 0.6% of rare earth and 0.3% of nitriding alloy agent are added into the outer layer of the high-speed steel for treatment, and the reaction temperature is 1550-1650 ℃; 0.5 percent of silicon-aluminum-barium alloy is added into the primary core before the primary core is taken out of the furnace, and the reaction temperature is 1580 and 1650 ℃; spheroidizing inoculation is carried out on the secondary core nodular cast iron, the nodulizer is rare earth magnesium silicon iron alloy, the adding amount is 1.0%, the inoculant is 75 silicon iron, the adding amount is 0.4%, and the reaction temperature is 1500-1600 ℃;
and (3) centrifugal casting, namely casting the outer layer of the high-speed steel roll at the casting temperature of 1420-1480 ℃, and casting the primary core after 5 minutes at the centrifugal gravity multiple of 70G.
Pouring the secondary core, namely combining the casting and the roll neck mold in the step, requiring the centrifuge to stop rotating until the molten iron of the cast core is controlled within 7 minutes after the casting is finished, and pouring the spheroidized secondary core nodular cast iron molten iron in the step under the static state after the casting is finished, wherein the pouring temperature is 1400-1550 ℃;
cooling to 200-320 ℃ at normal temperature, opening a box, carrying out rough heating and post-heat treatment, heating to 1000-1120 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 2-4 h, cooling to 400-450 ℃ at a speed of 130-140 ℃/h after discharging, heating to 500-550 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 10-32 h, cooling to room temperature at a cooling speed of 20-30 ℃/h, heating to 500-550 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 10-32 h, discharging, and air cooling to room temperature.
Example 3
This example differs from example 1 in that:
smelting in a medium-power frequency furnace, wherein the smelting temperature of molten steel at the outer layer of the roller is 1500-1650 ℃, the smelting temperature is 1.8C, 10.5Cr, 0.9Ni, 1.0Mo, 2.1V, 1.8W, 2.3Nb, 0.08Re, P is less than or equal to 0.04, S is less than or equal to 0.04, Mn is less than or equal to 0.5, 1.2Si, 0.3B, and the balance is Fe.
The smelting temperature of the semi-steel of the primary core part is 1580-1650 ℃, the weight percentage of chemical components is 1.2C, 0.09Cr + Mo + V + W, 0.1Re, P is less than or equal to 0.03, S is less than or equal to 0.03, Mn0.5, 1.5Si, and the balance is Fe.
Smelting nodular cast iron at 1500-1650 deg.C, wherein the smelting temperature is 3.2C, 0.2Cr, 0.5Ni, 0.1Re, P is less than or equal to 0.03, S is less than or equal to 0.02, Mn0.8, 1.7Si, and the rest is Fe
Respectively treating the outer layer of the high-speed steel, the primary core and the secondary core molten iron, and adding 0.4% of rare earth and 0.7% of nitriding alloy agent into the outer layer of the high-speed steel for treatment, wherein the reaction temperature is 1550-1650 ℃; 0.3 percent of silicon-aluminum-barium alloy is added into the primary core before the primary core is taken out of the furnace, and the reaction temperature is 1580 and 1650 ℃; spheroidizing inoculation is carried out on the secondary core nodular cast iron, the nodulizer is rare earth magnesium silicon iron alloy, the adding amount is 1.3%, the inoculant is 75 silicon iron, the adding amount is 0.7%, and the reaction temperature is 1500-1600 ℃;
and (3) centrifugal casting, namely casting the outer layer of the high-speed steel roll at the casting temperature of 1420-1480 ℃, and casting the primary core after 5 minutes, wherein the centrifugal gravity multiple is 60G.
Pouring the secondary core, namely combining the casting and the roll neck mold in the step, requiring the centrifuge to stop rotating until the molten iron of the cast core is controlled within 7 minutes after the casting is finished, and pouring the spheroidized secondary core nodular cast iron molten iron in the step under the static state after the casting is finished, wherein the pouring temperature is 1400-1550 ℃;
cooling to 200-320 ℃ at normal temperature, opening a box, carrying out rough heating and post-heat treatment, heating to 1000-1120 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 2-4 h, cooling to 400-450 ℃ at a speed of 130-140 ℃/h after discharging, heating to 500-550 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 10-32 h, cooling to room temperature at a cooling speed of 20-30 ℃/h, heating to 500-550 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 10-32 h, discharging, and air cooling to room temperature.
Example 4
The embodiment adopts an overflow process:
the modeling is the same as that of the embodiment 1, and the difference is that the bottom box of the embodiment is connected with an overflow pipe;
the molten steel of the outer layer steel, the primary core and the secondary core of the roll used for the medium-power frequency furnace smelting has the same chemical composition as that in the example 1, and the molten steel of the outer layer steel, the primary core and the secondary core of the high-speed steel is treated by the same method.
Centrifugal casting, namely casting the molten iron into the outer layer of the high-speed steel roll at the casting temperature of 1420-1480 ℃, wherein the centrifugal gravity multiple is 50G, when the temperature of a cavity of the outer layer of the high-speed steel roll reaches 1220-1280 ℃, stopping the rotation of a centrifugal machine, combining a mould box for placing the cast outer layer of the high-speed steel roll and a mould box for casting a roll neck, casting the processed primary core molten iron into the combined mould box under the static state of the combined mould box, and stopping pouring until the primary core molten iron flows out from an overflow groove, wherein the casting temperature is 1400-1550 ℃; and pouring the treated secondary core molten iron immediately after the primary core pouring is finished, wherein the pouring temperature is 1280-1400 ℃, and the pouring amount is 3 times of the mass of the primary core molten iron, so that the transition layer molten iron poured in the last step is completely washed and replaced. Ensuring that the primary core molten iron poured in the last step is completely flushed and replaced.
Cooling to 200-320 ℃ at normal temperature, opening the box, roughly heating and then carrying out heat treatment in the same heat treatment mode as the example 1.
Example 5
The embodiment adopts an overflow process:
the modeling is the same as that of the embodiment 2, and the difference is that the bottom box of the embodiment is connected with an overflow pipe;
the molten steel of the outer layer steel, the primary core and the secondary core of the roller used for the smelting in the medium-power frequency furnace has the same chemical composition as that in the example 2, and the molten iron of the outer layer steel, the primary core and the secondary core of the high-speed steel is treated by the same method.
Centrifugal casting, namely casting the molten iron into the outer layer of the high-speed steel roll at the casting temperature of 1420-1480 ℃, wherein the centrifugal gravity multiple is 50G, when the temperature of a cavity of the outer layer of the high-speed steel roll reaches 1220-1280 ℃, stopping the rotation of a centrifugal machine, combining a mould box for placing the cast outer layer of the high-speed steel roll and a mould box for casting a roll neck, casting the processed primary core molten iron into the combined mould box under the static state of the combined mould box, and stopping pouring until the primary core molten iron flows out from an overflow groove, wherein the casting temperature is 1400-1550 ℃; and pouring the treated secondary core molten iron immediately after the primary core pouring is finished, wherein the pouring temperature is 1280-1400 ℃, and the pouring amount is 3 times of the mass of the primary core molten iron, so that the transition layer molten iron poured in the last step is completely washed and replaced. Ensuring that the primary core molten iron poured in the last step is completely flushed and replaced.
Cooling to 200-320 ℃ at normal temperature, opening the box, roughly heating and then carrying out heat treatment, wherein the heat treatment mode is the same as that of the example 2.
The composite roller prepared in each embodiment is subjected to mechanical property detection, and the ultrasonic flaw detection execution standard GB/T1503-2008 is adopted. The results and the application properties are shown in Table 1
TABLE 1
Claims (8)
1. A manufacturing method of a high-boron high-speed steel centrifugal composite roller comprises the steps of molding, smelting, pouring, unpacking and heat treatment, and is characterized in that: before the molten iron on the outer layer of the high-speed steel is discharged from the furnace, adding ferroboron into the smelting furnace, adding a certain amount of alloy nitriding agent during discharging, pouring a primary core after the outer layer is poured for a period of time, and pouring the molten iron on the core after the outer layer is closed.
2. The method for manufacturing the high-boron high-speed steel centrifugal composite roll according to claim 1, wherein the method comprises the following steps: the composite roll comprises the following chemical components in percentage by weight: c: 1.2-2.2, Cr: 7.0 to 13.5, Ni: 0.2 to 1.2, Mo: 0.5-1.5, V: 1.0-2.5, W: 1.0 to 2.5, Nb: 1.0-3.0, Re: 0.05-0.1, P is less than or equal to 0.04, S is less than or equal to 0.04, Mn is less than or equal to 0.5, Si: 0.6-1.5, B: 0.05-0.5, and the balance of Fe; smelting primary core semi-steel, wherein the chemical components in percentage by weight are as follows: c: 1.0-1.5, Cr + Mo + V + W: 0.01-0.15, Re: 0.1, P is less than or equal to 0.03, S is less than or equal to 0.03, Mn: 0.3 to 0.8, Si: 1.1-1.8, and the balance of Fe; smelting nodular cast iron at the core part of the secondary core, wherein the nodular cast iron comprises the following chemical components in percentage by weight: c: 2.9-3.6, Cr: 0.1 to 0.5, Ni: 0.2-0.8, Re: 0.1, P is less than or equal to 0.03, S is less than or equal to 0.02, Mn: 0.3 to 1.0, Si: 1.3-2.0, and the balance Fe.
3. The manufacturing method of the high boron high speed steel centrifugal composite roll according to any one of claims 1 to 2, characterized by comprising the following manufacturing steps:
s1, molding, wherein the casting box comprises an end cover, a roller body molding box and a journal molding box, the journal molding box comprises a bottom box and a dead head molding box, and the roller body part adopts metal mold spray coating; the shaft neck is molded by water glass, a curing agent and silica sand, and the surface of the shaft neck is brushed with alcohol-based paint; the end cover is molded by silica sand and clay, and the bottom of the bottom box is closed;
s2, smelting in an intermediate frequency furnace, and respectively carrying out high-speed steel outer layer smelting, primary core semisteel smelting and secondary core nodular cast iron smelting;
s3, respectively treating the outer layer of the high-speed steel, the primary core and the molten iron of the secondary core, adding ferroboron into the high-speed steel before the outer layer of the high-speed steel is discharged out of the furnace, adding 0.1-0.5% of silicon-aluminum-barium alloy into the furnace before the primary core is discharged out of the furnace, and carrying out spheroidizing inoculation on the nodular cast iron of the secondary core;
s4, when the outer layer of the high-speed steel is discharged, adding 0.2-0.6% of rare earth and 0.3-1.5% of nitriding alloy agent into the ladle for treatment;
s5, centrifugal casting, namely, casting the high-speed steel working layer under centrifugal force, casting the primary core after a period of time, and stopping when the casting layer is cooled to 1100-1150 ℃, and performing box closing operation;
s6, casting the secondary core part after mould assembling, and casting the spheroidized molten iron of the secondary core part;
and S7, cooling to normal temperature, opening the box, roughly heating and then carrying out heat treatment.
4. The method for manufacturing the high-boron high-speed steel centrifugal composite roll according to claim 3, wherein the method comprises the following steps: the alloy nitriding agent is chromium nitride.
5. The method for manufacturing the high-boron high-speed steel centrifugal composite roll according to claim 3, wherein the method comprises the following steps: in step S5, the core is poured once after 5 minutes of outer layer pouring.
6. The method for manufacturing the high-boron high-speed steel centrifugal composite roll according to claim 3, wherein the method comprises the following steps: in the step S3, the adding amount of ferroboron is 1% -2%, the nodulizer used in the nodulizing treatment is rare earth magnesium silicon iron alloy, the adding amount is 1.0-1.6%, the inoculant is 75 ferrosilicon, and the adding amount is 0.4-1.0%.
7. The method for manufacturing the high-boron high-speed steel centrifugal composite roll according to claim 3, wherein the method comprises the following steps: procedure of heat treatment in step S7: heating to 1000-1120 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 2-4 h, cooling to 400-450 ℃ at a speed of 130-140 ℃/h, raising the temperature to 500-550 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 10-32 h, lowering the temperature to room temperature at a cooling speed of 20-30 ℃/h, raising the temperature to 500-550 ℃ at a heating speed of 20-30 ℃/h, preserving heat for 10-32 h, taking out of the furnace, and air cooling to room temperature.
8. The method for manufacturing the high-boron high-speed steel centrifugal composite roll according to claim 3, wherein the method comprises the following steps: step S3, adding silicon-aluminum-barium alloy into the primary core before tapping for treatment, wherein the reaction temperature is 1580-; and step S4, adding 0.2-0.6% of rare earth and alloy nitride agent into the outer high-speed steel layer package for treatment, wherein the reaction temperature is 1550-1650 ℃.
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