CN101623751A - Method for preparing boracic low-alloy high-speed steel rolls - Google Patents

Method for preparing boracic low-alloy high-speed steel rolls Download PDF

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CN101623751A
CN101623751A CN200910091187A CN200910091187A CN101623751A CN 101623751 A CN101623751 A CN 101623751A CN 200910091187 A CN200910091187 A CN 200910091187A CN 200910091187 A CN200910091187 A CN 200910091187A CN 101623751 A CN101623751 A CN 101623751A
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roll
temperature
speed steel
alloy high
barrel diameter
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CN101623751B (en
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符寒光
雷永平
戴建方
邢建东
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Beijing University of Technology
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Beijing University of Technology
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Abstract

The invention relates to a method for preparing boracic low-alloy high-speed steel rolls, which is characterized by comprising the following steps: firstly carrying out metal mold casting of the roll, wherein a roll body is made of boracic low-alloy high-speed steel, and a roll core is made of ductile cast iron; putting the roll into a heating furnace at the temperature of lower than 200 DEG C after rough machining, preserving heat for 1-3 hours, then heating to the temperature of 520-580 DEG C at the temperature rising speed of 15-25 DEG C per hour, and air cooling after heat preservation; and then, putting the roll into the heating furnace at the temperature of lower than 300 DEG C again, preserving heat for 1-2 hours, then heating to the temperature of 480-510 DEG C at the temperature rising speed of 28-40 DEG C per hour, cooling the furnace to the temperature of lower than 180 DEG C after heat preservation, and air cooling to the room temperature. The method not only has low energy consumption and a short heating processing period, but also has good use effect when being used for the heating processing of the boracic low-alloy high-speed steel roll.

Description

A kind of preparation method of boracic low-alloy high-speed steel rolls
Technical field
The invention belongs to roll manufacturing technology field, be specifically related to a kind of preparation method of roll, particularly a kind of preparation method of boracic low-alloy high-speed steel rolls.
Background technology
Roll is the main consumable part during steel rolling is produced, and improves the roll Study on Wear Resistance, receives concern both domestic and external always.Adopting high-speed steel to replace materials such as rich chromium cast iron, Minvar, chrome molybdenum cast iron and nickel chromium triangle molybdenum cast iron and make roll, is the main path that improves the roll wearability.The chemical composition that Japanese patent gazette JP6330235 discloses a kind of centrifugal casting quick-cutting steel roll material is as follows: C:1.4-2.6%, Si:0.2-1.5%, Mn<1.5%, Cr:3-8%, (2Mo+W): 6-14%, V:4-8%, Ti:0.3-2.5%, surplus Fe.U.S. Pat 6095957 discloses a kind of high speed steel roll material, and its chemical composition (weight %) is: C:2.4~2.9, Cr:12.0~18.0, Mo:3.0~9.0, V:3.0~7.0, Nb:0.5~4.0, Si<1.0, Mn<1.0, W<1.0.Chinese invention patent CN1807671 also discloses a kind of continuous composite high speed steel roll formula, and the technical recipe of the outer body of roll (weight %) is: 1.5-3.5C, 2.0-7.0Cr, 2.0-7.0Mo, 4.0-10.0V, 4.0-10.0W, 0-10.0Co, Ni<2.0, all the other are Fe.Above-mentioned roll material has excellent abrasive, but contains more alloying element, so the production cost height.
Discover, in high-speed steel roll, add the right amount of boron element, can partly replace expensive alloy element such as tungsten in the high-speed steel roll, molybdenum, vanadium, reduce the high-speed steel roll production cost.The objective of the invention is the Technology for Heating Processing of boracic low-alloy high-speed steel rolls is improved, adding tempering by the quenching of routine changes double tempering into and handles, the present invention cancels the quench hot of roll, the one, can energy savings, the 2nd, the oxidation and the decarburization on surface in the time of can eliminating the heating of roll high temperature, the 3rd, the decline of roller core intensity in the time of can eliminating the heating of roll high temperature.In order to cancel the quench hot of boracic low-alloy high-speed steel rolls, in the cast iron roll in as-cast tissue pearlite should not appear, and the as cast condition matrix should be based on austenite and martensite.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of preparation method of boracic low-alloy high-speed steel rolls, its concrete steps comprise:
Roll at first adopts metal type cast, and the roll barrel material is a boracic low-alloy high-speed steel, and roller core is a spheroidal graphite cast-iron, and metal mold is a casting pig, and mo(U)ld face needs the spary blacking, and paint thickness is controlled at 1.2~1.8mm; During stenciling coating, mold temperature is controlled at 140~200 ℃, and during the cast boracic low-alloy high-speed steel rolls, mold temperature is controlled at 90~130 ℃, and the roll pouring temperature is controlled at above 50~70 ℃ of boracic low-alloy high-speed steel fusing point; Unpacking air cooling removed dead head then after the roll cast finished 4~10 hours;
Roll places temperature to be lower than 200 ℃ heating furnace after roughing, is incubated after 1~3 hour, is heated to 520~580 ℃ with 15~25 ℃/hour programming rate then, carries out the heat treatment insulation first time, then air cooling; Again place temperature to be lower than 300 ℃ heating furnace on roll again, be incubated after 1~2 hour, be heated to 480~510 ℃ with 28~40 ℃/hour programming rate then, carry out the heat treatment insulation second time, after stove is chilled to temperature and is lower than 180 ℃ then, air cooling is refined to given size and precision at last to room temperature.
Wherein the wall thickness of metal mold is pressed following formula and is determined
δ=a·D (1)
In the formula: δ-casting mold wall thickness, mm; D-roll barrel diameter, mm; A-casting mold coefficient, a=0.25~0.45, the roll barrel diameter is during greater than 600mm, and a=0.45, roll barrel diameter be during less than 400mm, when a=0.25,400mm≤roll barrel diameter≤600mm, 0.25<a<0.45.
The temperature retention time of heat treatment is for the first time pressed following formula and is determined:
t 1=200+k 1·D (2)
In the formula: t 1-heat treatment for the first time temperature retention time, min; D-roll barrel diameter, mm; k 1-heat insulating coefficient, min/mm, wherein k 1=0.3~0.5, when roll barrel diameter during greater than 600mm, k 1=0.5; The roll barrel diameter is during less than 400mm, k 1=0.3; During 400mm≤roll barrel diameter≤600mm, 0.3<k 1<0.5.
The temperature retention time of heat treatment is for the second time pressed following formula and is determined:
t 2=250+k 2·D (3)
In the formula: t 2-heat treatment for the second time temperature retention time, min; D-roll barrel diameter, mm; k 2-heat insulating coefficient, min/mm, wherein k 2=0.4~0.6, when roll barrel diameter during greater than 600mm, k 2=0.6; The roll barrel diameter is during less than 400mm, k 2=0.4; During 400mm≤roll barrel diameter≤600mm, 0.4<k 2<0.6.
The main component of boracic low-alloy high-speed steel rolls of the present invention (mass fraction, %) as follows: 0.3-1.0C, 1.0-2.5B, 5.0-7.0Cr, V<1.5, Mo<1.5, Nb<1.0, Co<1.0, W<1.0, Si<1.5, Mn<1.5, surplus Fe and inevitable trace impurity, wherein, 3.0<V+Mo+Nb+Co+W<5.0.
In order to obtain no pearlitic boracic low-alloy high-speed steel rolls in the as-cast structure, the cooling of solidifying of accelerating roll is extremely necessary, and realizing solidifying fast cold major measure is control casting mold thickness, pouring temperature, mold temperature, coating and paint thickness etc.The present invention is in conjunction with the process of setting of boracic low-alloy high-speed steel, propose casting mold and adopt the good casting pig of thermal conductivity, in order to improve the heat storage capacity of casting mold, need carry out strictness control to its casting mold thickness, casting mold thickness is thin excessively, and accumulation of heat is few, and the roll cooling is slow, be prone to pearlite in the solidified structure, casting mold thickness is blocked up, although heat storage capacity is strong, helps accelerating the cooling of roll, but casting mold is excessive, operation inconvenience when particularly adopting centrifugal casting to produce, also need consume too much power, determine casting mold thickness by formula (1), can guarantee not occur in the boracic low-alloy high-speed steel rolls solidified structure pearlite.
Mo(U)ld face needs the spary blacking, mainly is in order to protect casting mold, to prevent roll and casting mold adhesion, prolonging mould life, blacking cheapness, and good heat conductivity.Paint thickness is controlled at 1.2~1.8mm, during stenciling coating, mold temperature is controlled at 140~200 ℃, during the cast boracic low-alloy high-speed steel rolls, mold temperature is controlled at 90~130 ℃, the roll pouring temperature is controlled at above 50~70 ℃ of boracic low-alloy high-speed steel fusing point, and it is extremely important that acquisition as cast condition is not had pearlitic low-alloy high-speed steel roll.
Because the as cast condition matrix of roll is based on martensite, austenite, also contains a small amount of bainite in addition, the hardness of cast form height surpasses 60HRC, after roll removes dead head, and can direct tempering without quench hot.During direct tempering, roll is gone into the stove furnace temperature should be lower than 200 ℃, and furnace temperature is too high, and roll stress is big, and is easy to crack.The cast boron-containing low alloy high-speed steel roll is heated to 520~580 ℃, temperature retention time (t with 15~25 ℃/hour programming rate 1) determine that by formula (2) air cooling can guarantee that austenite residual in the roll decomposes then, helps further improving roll hardness, improves the roll wearability.
The retained austenite decomposition can cause volumetric expansion, the roll internal stress is increased, therefore, need to place temperature to be lower than 300 ℃ heating furnace again on roll, be incubated after 1~2 hour, be heated to 480~510 ℃, temperature retention time (t with 28~40 ℃/hour programming rate then 2) determine that by formula (3) after stove was chilled to temperature and is lower than 180 ℃ then, air cooling can reduce the roll internal stress to room temperature, guarantees that roll can not ftracture and peel off in using.
The present invention compared with prior art has the following advantages:
1) the present invention has saved quench hot technology, and roll heat treatment energy consumption is low, the cycle is short, and roll surface oxidation and decarburization can not occur, and roller core intensity and as cast condition are quite, can not descend;
2) roll of technology acquisition of the present invention has good result of use, reach 4~5 times of high Minvar roll service life, and roll is safe in utilization, and no roll breakage phenomenon occurs in the use.
The specific embodiment
Below in conjunction with embodiment the present invention is further described:
Embodiment 1:
The present invention is used for producing
Figure G200910091187XD00051
Roll.Skin of the roll is a boracic low-alloy high-speed steel, and main component (mass fraction, %) as follows: 0.38C, 2.46B, 5.11Cr, 0.27V, 1.28Mo, 0.51Nb, 0.27Co, 0.81W, 1.17Si, 0.80Mn, surplus Fe and inevitable trace impurity.The roll roller core is a spheroidal graphite cast-iron.Roll at first adopts metal type cast, and metal mold is a casting pig, casting mold wall thickness 90mm.
Mo(U)ld face spary blacking, paint thickness is controlled at 1.2mm.During stenciling coating, mold temperature is controlled at 200 ℃, and during the cast boracic low-alloy high-speed steel rolls, mold temperature is controlled at 120 ℃, and the roll pouring temperature is controlled at above 70 ℃ of boracic low-alloy high-speed steel fusing point.Unpacking air cooling removed dead head then after the roll cast finished 4 hours.Roll places temperature to be lower than 200 ℃ heating furnace after roughing, is incubated after 1 hour, is heated to 540 ℃ with 25 ℃/hour programming rate then, insulation 308min, air cooling then.Again place temperature to be lower than 300 ℃ heating furnace on roll again, be incubated after 1 hour, be heated to 500 ℃ with 40 ℃/hour programming rate then, insulation 394min, after stove was chilled to temperature and is lower than 180 ℃ then, air cooling was refined to the roll external diameter at last to room temperature
Figure G200910091187XD00061
The roller surface smoothness is refined to 0.50 μ m.
Embodiment 2:
The present invention is used for producing
Figure G200910091187XD00062
Roll.Skin of the roll is a boracic low-alloy high-speed steel, and main component (mass fraction, %) as follows: 0.95C, 1.04B, 6.90Cr, 0.85V, 1.44Mo, 0.31Nb, 0.52Co, 0.63W, 0.88Si, 1.30Mn, surplus Fe and inevitable trace impurity.The roll roller core is a spheroidal graphite cast-iron.Roll at first adopts metal type cast, and metal mold is a casting pig, casting mold wall thickness 292.5mm.
Mo(U)ld face needs the spary blacking, and paint thickness is controlled at 1.8mm.During stenciling coating, mold temperature is controlled at 140 ℃, and during the cast boracic low-alloy high-speed steel rolls, mold temperature is controlled at 90 ℃, and the roll pouring temperature is controlled at above 50 ℃ of boracic low-alloy high-speed steel fusing point.Unpacking air cooling removed dead head then after the roll cast finished 10 hours.Roll places temperature to be lower than 200 ℃ heating furnace after roughing, is incubated after 3 hours, is heated to 520 ℃ with 15 ℃/hour programming rate then, insulation 525min, air cooling then.Again place temperature to be lower than 300 ℃ heating furnace on roll again, be incubated after 2 hours, be heated to 480 ℃ with 28 ℃/hour programming rate then, insulation 640min, after stove was chilled to temperature and is lower than 180 ℃ then, air cooling was refined to the roll external diameter at last to room temperature
Figure G200910091187XD00063
The roller surface smoothness is refined to 0.47 μ m.
Embodiment 3:
The present invention is used for producing Roll.Skin of the roll is a boracic low-alloy high-speed steel, and main component (mass fraction, %) as follows: 0.66C, 1.81B, 5.68Cr, 1.35V, 1.10Mo, 0.68Nb, 0.34Co, 0.60W, 1.24Si, 1.06Mn, surplus Fe and inevitable trace impurity.The roll roller core is a spheroidal graphite cast-iron.Roll at first adopts metal type cast, and metal mold is a casting pig, casting mold wall thickness 180mm.
Mo(U)ld face spary blacking, paint thickness is controlled at 1.5mm.During stenciling coating, mold temperature is controlled at 170 ℃, and during the cast boracic low-alloy high-speed steel rolls, mold temperature is controlled at 130 ℃, and the roll pouring temperature is controlled at above 60 ℃ of boracic low-alloy high-speed steel fusing point.Unpacking air cooling removed dead head then after the roll cast finished 6 hours.Roll places temperature to be lower than 200 ℃ heating furnace after roughing, is incubated after 2 hours, is heated to 580 ℃ with 20 ℃/hour programming rate then, insulation 410min, air cooling then.Again place temperature to be lower than 300 ℃ heating furnace on roll again, be incubated after 1 hour, be heated to 510 ℃ with 35 ℃/hour programming rate then, insulation 500min, after stove was chilled to temperature and is lower than 180 ℃ then, air cooling was refined to the roll external diameter at last to room temperature
Figure G200910091187XD00072
The roller surface smoothness is refined to 0.48 μ m.
Above-mentioned boracic low-alloy high-speed steel rolls hardness reaches 61~63HRC, the roll surface uniformity of hardness is good, be used for hot-strip and bar mill, safe in utilization, no roll breakage and peeling phenomenon occur, reach 4~5 times of high Minvar roll service life, and production cost only improves 20~25% than high Minvar roll.

Claims (4)

1, a kind of preparation method of boracic low-alloy high-speed steel rolls is characterized in that may further comprise the steps:
Roll at first adopts metal type cast, and the roll barrel material is a boracic low-alloy high-speed steel, and roller core is a spheroidal graphite cast-iron, and metal mold is a casting pig, and mo(U)ld face needs the spary blacking, and paint thickness is controlled at 1.2~1.8mm; During stenciling coating, mold temperature is controlled at 140~200 ℃, and during the cast boracic low-alloy high-speed steel rolls, mold temperature is controlled at 90~130 ℃, and the roll pouring temperature is controlled at above 50~70 ℃ of boracic low-alloy high-speed steel fusing point; Unpacking air cooling removed then to water and emits after the roll cast finished 4~10 hours;
Roll places temperature to be lower than 200 ℃ heating furnace after roughing, is incubated after 1~3 hour, is heated to 520~580 ℃ with 15~25 ℃/hour programming rate then, carries out the heat treatment insulation first time, then air cooling; Again place temperature to be lower than 300 ℃ heating furnace on roll again, be incubated after 1~2 hour, be heated to 480~510 ℃ with 28~40 ℃/hour programming rate then, carry out the heat treatment insulation second time, after stove is chilled to temperature and is lower than 180 ℃ then, air cooling is refined to given size and precision at last to room temperature.
2, the preparation method of a kind of boracic low-alloy high-speed steel rolls according to claim 1 is characterized in that the wall thickness of described metal mold is determined by following formula
δ=a·D (1)
In the formula: δ-casting mold wall thickness, mm; D-roll barrel diameter, mm; A-casting mold coefficient, a=0.25~0.45, the roll barrel diameter is during greater than 600mm, and a=0.45, roll barrel diameter be during less than 400mm, when a=0.25,400mm≤roll barrel diameter≤600mm, 0.25<a<0.45.
3, the preparation method of a kind of boracic low-alloy high-speed steel rolls according to claim 1 and 2 is characterized in that described heat treatment first time temperature retention time is definite by following formula:
t 1=200+k 1·D (2)
In the formula: t 1-heat treatment for the first time temperature retention time, min; D-roll barrel diameter, mm; k 1-heat insulating coefficient, min/mm, wherein k 1=0.3~0.5, when roll barrel diameter during greater than 600mm, k 1=0.5; The roll barrel diameter is during less than 400mm, k 1=0.3; During 400mm≤roll barrel diameter≤600mm, 0.3<k 1<0.5.
4, the preparation method of a kind of boracic low-alloy high-speed steel rolls according to claim 1 and 2 is characterized in that described heat treatment second time temperature retention time is definite by following formula:
t 2=250+k 2·D (3)
In the formula: t 2-heat treatment for the second time temperature retention time, min; D-roll barrel diameter, mm; k 2-heat insulating coefficient, min/mm, wherein k 2=0.4~0.6, when roll barrel diameter during greater than 600mm, k 2=0.6; The roll barrel diameter is during less than 400mm, k 2=0.4; During 400mm≤roll barrel diameter≤600mm, 0.4<k 2<0.6.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101985685A (en) * 2010-11-23 2011-03-16 大连冶金工具厂有限公司 Roller tempering heat treatment process
CN102397874A (en) * 2010-09-16 2012-04-04 鞍钢股份有限公司 Method for prolonging service life of high-speed steel roller
CN105458227A (en) * 2015-12-04 2016-04-06 北京工业大学 Centrifugal casting high-boron high-speed steel composite roller and preparing method thereof
CN106929770A (en) * 2017-04-18 2017-07-07 北京工业大学 A kind of roll of boron high-speed steel containing aluminium
CN110218864A (en) * 2019-06-12 2019-09-10 山东钢铁股份有限公司 The method for preventing ball press roller sizing

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102397874A (en) * 2010-09-16 2012-04-04 鞍钢股份有限公司 Method for prolonging service life of high-speed steel roller
CN101985685A (en) * 2010-11-23 2011-03-16 大连冶金工具厂有限公司 Roller tempering heat treatment process
CN105458227A (en) * 2015-12-04 2016-04-06 北京工业大学 Centrifugal casting high-boron high-speed steel composite roller and preparing method thereof
CN105458227B (en) * 2015-12-04 2017-12-29 北京工业大学 Centrifugal casting high-boron high-speed steel composite roller and preparation method thereof
CN106929770A (en) * 2017-04-18 2017-07-07 北京工业大学 A kind of roll of boron high-speed steel containing aluminium
CN106929770B (en) * 2017-04-18 2018-06-01 北京工业大学 A kind of roll of boron high-speed steel containing aluminium
CN110218864A (en) * 2019-06-12 2019-09-10 山东钢铁股份有限公司 The method for preventing ball press roller sizing

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