CN101892374A - Method for performing heat treatment on high-hardness semisteel roll - Google Patents
Method for performing heat treatment on high-hardness semisteel roll Download PDFInfo
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- CN101892374A CN101892374A CN 201010237616 CN201010237616A CN101892374A CN 101892374 A CN101892374 A CN 101892374A CN 201010237616 CN201010237616 CN 201010237616 CN 201010237616 A CN201010237616 A CN 201010237616A CN 101892374 A CN101892374 A CN 101892374A
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Abstract
The invention discloses a method for performing heat treatment on a high-hardness semisteel roll which is suitable for the roll made of a 155CrNiMo or 180 CrNiMo material and with the roll diameter phi of 850 to 1,350mm. A heat treatment process comprises the following steps of: integrally heating the roll to the normalizing temperature of between 950 and 1,000 DEG C and preserving the heat for 15 to 30 hours; hanging the roll out of a heating furnace quickly, and putting the roll into quenching oil for cooling to ensure that the surface temperature of the roll reaches between 230 and 250 DEG C, wherein the temperature of 50-mm depth is between 270 and 300 DEG C; and the temperature of 100-mm depth is between 400 and 450 DEG C; hanging the roll on a spraying machine quickly for air cooling to ensure that the surface temperature of the roll reaches less than or equal to 480 DEG C, and after the temperature does not rise, reducing the wind pressure gradually, wherein the cooling rate of the whole air cooling process is controlled to be 2 to 5 DEG C/minute; and when the surface temperature of the roll can be kept to be below 480 and over 300 DEG C, and the temperature does not rise, performing air cooling on the roll. In the invention, the common heat treatment method for the semisteel roll is changed, and the concept that the semisteel material and the cast iron material cannot be subjected to oil quenching is broken by properly controlling the oil cooling time and the cooling temperatures at different stages; the roll is cooled at a certain cooling speed by controlling the blowing rate and blowing strength; and the hardness of the high-hardness large semisteel roll is over 55HSD because the two cooling methods, namely oil cooling and air cooling are matched effectively.
Description
Technical field
The present invention relates to a kind of heat treating method, be meant that specifically a kind of brand-new half steel material roll to the high fragility material of high-carbon carries out the high rigidity heat-treating methods.
Background technology
Semisteel roll generally is to be used for rolling section bar, rolling mill for hot rolled planks and strips roughing etc. on heavy merchant mill, and carbon content is generally very high in the material of semisteel roll, and near the carbon content of cast iron, the hardness of this type of roll requires also than higher.According to traditional thermal treatment process, can not adopt quench treatment to half steel and cast iron materials, promptly can not adopt the violent type of cooling such as water-cooled, oil cooling to heat-treat, can only adopt the mode of air cooling to carry out normalizing treatment.In order to reach the high rigidity requirement of big specification high-carbon semisteel roll, the past prior heat treatment process is to adopt the spraying thermal treatment process, and its normalizing temperature is generally 900～950 ℃, adopts spray cooling 15～20 minutes after normalizing is come out of the stove, and blowing is cooled to 480 ℃ then.Because heat-eliminating medium is the miscellany of wind and water,, can cause the cooling uniformity of roller surface and final cooling temperature to be difficult to control because water is very fast in the cooling rate of low thermophase.Under the lower situation of the even final cooling temperature of roller surface inhomogeneous cooling, all can crack.Guarantee the semisteel roll hardness requirement of high rigidity, blast, hydraulic pressure big during spray cooling are necessary, if water spray intensity is too low, hardness then can't satisfy technical requirements.When but if the water yield is big in the process of cooling; inevitably can make the roll surface cooling inhomogeneous again; through regular meeting the local surfaces temperature is dropped to below 100 ℃; if the surface temperature of semisteel roll is cooled to below 100 ℃ in heat treatment process; the heat treatment stress on surface can sharply strengthen, and can cause roller surface to form stress crack like this.Along with the increase of roll specification, the increase that heat treatment stress can be at double, the crackle tendency also sharply increases, and this is that semisteel roll institute is unallowed, and in a single day roll has crackle to scrap.When adopting present method to produce, be not that crackle to occur be exactly the hardness deficiency, uniformity of hardness is also very poor, and scrap rate is very high.
Crackle occurring in the heat treatment process and scrap and to make product hardness problem on the low side be the FAQs of thermal treatment work because of cooling off deficiency, is again mutual contradiction between the two, is difficult to take into account simultaneously.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of heat-treatment technology method of big specification high-carbon semisteel roll of high rigidity requirement, thus the problem of the scrap rate height that the big specification high-carbon semisteel roll that the solution high rigidity requires causes when thermal treatment, hardness deficiency, uniformity of hardness difference.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of heat treating method of high rigidity semisteel roll, roll material therefor are the wherein a kind of of 155CrNiMo or 180CrNiMo, and the roller body diameter is Φ 850～1350mm,, comprise heating, cooling work step, heat-treatment technology method comprises the following steps
A, roll integral body is heated to normalizing temperature 950-1000 ℃, and is incubated 15～30h;
B, rapidly roll is hung out process furnace, put into quenching oil and cool off, make the roller surface temperature reach 230～250 ℃, the temperature of 50mm working lining depths is 270～290 ℃, the temperature 400-450 of 100mm depths ℃;
C, roll hung rapidly carry out list blowing cooling on the spraying machine then, make the roller surface temperature reach≤480 ℃ and no longer heat up after progressively reduce blast again, the cooling rate of whole air-cooled process is controlled at about 2～5 ℃/min;
D, when the roller surface temperature can remain on below 480 ℃ more than 300 ℃ and no longer heat up the back, air cooling gets final product.
Further concrete operation method of the present invention is: the oil cooling time among the described step B is 20～30 minutes; The blast at initial stage keeps 0.25～0.35Mpa among the described step C, and whole blow-time is 50～80min.
Further improvement of the present invention is: roll is from coming out of the stove to going into oil time≤5min among the described step B; Roll is from fuel-displaced supreme spraying machine blow-time≤3min among the step C.
Owing to adopted technique scheme, the obtained technical progress of the present invention is:
The present invention has changed semisteel roll heat treating method commonly used, changes the spray cooling in the normalizing treatment process into oil cooling and air-cooled marquenching method.By the cooling temperature of appropriate control oil cooling time, different steps, broken the idea that half steel and cast iron materials can not carry out water-cooled or oil cooling processing; Again by controlling the intensity of air quantity and blowing, make roll slowly cooling under certain speed of cooling, reach and promptly do not make the working lining that is quenched return temperature, also do not make the roll cooling too fast, austenite is slowly changed, up to the final bainite that is transformed into than more completely to bainite structure.By effective cooperation of oil cooling and air-cooled two kinds of method of cooling, produce hardness and reach the above large-scale semisteel roll of high rigidity of 55HSD.
The carbon content of high-carbon half steel material is very high, and its heat treated conventional theory is can only air cooling and can not adopt more violent Cooling Mode such as oil cooling, traditional theory to think that high-carbon half steel material adopts the oil cooling will inevitably be with the workpiece hardening crack.And the solution of the air-cooled marquenching method success of oil cooling+spraying machine that the present invention adopts cracking during large-scale high-carbon semisteel roll thermal treatment and hardness deficiency, a uneven difficult problem, this method be to initiate both at home and abroad.By the appropriate design of control oil cooling time, oil outlet temperature, air-cooled intensity and speed, guaranteed the qualification rate of product, not only can not ftracture, and the uniformity coefficient of hardness and hardness has all reached technical requirements.Material with explained hereafter of the present invention is the roughing working roll of 155CrNiMo, body of roll finished diameter 1250mm, hardness of roll body reaches 55-57HSD, the material of producing is the roll of 180CrNiMo, many kinds of models of body of roll finished diameter ￠ 900-1200mm, and hardness of roll body reaches 58～60HSD.Produce up to a hundred of large-scale high-carbon semisteel rolls with this processing method at present, crackle and hardness substandard product did not occur.Method of the present invention can also be generalized to all half steels and cast iron class roll, can solve the quenching difficult problem of high-carbon fragility material roll.
Embodiment
Below in conjunction with embodiment the present invention is described in further details:
Embodiment 1
Roughing working roll, material therefor are 155CrNiMo, and the roller body diameter is Φ 1250mm, and heat-treatment technology method comprises:
Roll integral body is heated to 980 ± 5 ℃ of normalizing temperatures, is incubated 15 hours; Open process furnace, hang out roll rapidly, put into quenching oil and cool off, can not be above 5 minutes from opening fire door to going into the oily timed interval; The oil cooling time is 30 minutes, and this moment, the temperature of roller surface reached 230～250 ℃; After time of arrival, again roll is hung the cooling of drying on the spraying machine rapidly, from fuel-displaced to the blowing refrigerative time can not be above 3 minutes; Blowing refrigerative initial stage dividing potential drop is 0.28Mpa, when the roller surface temperature reach≤480 ℃ and no longer heat up after progressively reduce blast again, the time of whole blowing process is 80min, prevent that roll from returning temperature, when the roller surface temperature can remain on 450 ℃, stop blowing, air cooling.Produce 4 batches of 60 roughing working rolls altogether with this method, the hardness of roll body of every roll is all at 55～57HSD.
Embodiment 2
Produce the Egyptian roll of outlet, material is 180CrNiMo, roll diameter is respectively ￠ 900, ￠ 910, ￠ 950, ￠ 980, ￠ 1000, ￠ 1100, ￠ 1200mm does not wait, produce 30 altogether, heat-treatment technology method comprises: the whole Heating temperature of roll is respectively 950 ℃, 980 ℃, 960 ℃, 970 ℃, 1000 ℃, 990 ℃, 980 ℃, soaking time is respectively 10h, 11h, 14h, 12h, 13h, 11.5h, 12.5h, hang out rapidly and put into quenching oil and cool off, the oil cooling time was respectively 20 minutes, 28 minutes, 22 minutes, 24 minutes, 25 minutes, 26 minutes, 27 minutes, again roll is hung the cooling of drying on the spraying machine rapidly, the initial stage dividing potential drop is 0.32Mpa, 0.25Mpa, 0.26Mpa, 0.30Mpa, 0.31Mpa, 0.29Mpa, blow-time is 50min, 70min, 65min, 60min, 55min, 58min, 68min, final cooling temperature are controlled at about 420 ℃.After this thermal treatment, the hardness of roll body of every roll is all at 58～60HSD.
Heating temperature, cooling temperature, soaking time, cooling time and blast in certain method of the present invention can also be selected the foregoing description other numerical value in addition in the claimed range of the present invention.
Claims (3)
1. the heat treating method of a high rigidity semisteel roll, the roll material therefor is the wherein a kind of of 155CrNiMo or 180CrNiMo, the roller body diameter is Φ 850～1350mm, comprises heating, cooling work step, and it is characterized in that: heat-treatment technology method comprises the following steps
A, roll integral body is heated to normalizing temperature 950-1000 ℃, and is incubated 15～30h;
B, rapidly roll is hung out process furnace, put into quenching oil and cool off, make the roller surface temperature reach 230～250 ℃, the temperature of 50mm depths is 270～300 ℃, the temperature 400-450 of 100mm depths ℃;
C, roll is hung the cooling of drying on the spraying machine rapidly, make the roller surface temperature reach≤480 ℃ and temperature no longer raise, and progressively reduces blast, the cooling rate of whole air-cooled process is controlled at 2～5 ℃/min;
D, when the roller surface temperature can remain on below 480 ℃ more than 300 ℃ and no longer raise, air cooling gets final product.
2. the heat treating method of a kind of high rigidity semisteel roll according to claim 1 is characterized in that: the oil cooling time among the described step B is 20～30 minutes; The blast at initial stage keeps 0.25～0.35Mpa among the described step C, and whole blow-time is 50～80min.
3. according to the heat treating method of claim 1 or 2 described a kind of high rigidity semisteel rolls, it is characterized in that: roll is from coming out of the stove to going into oil time≤5min among the described step B; Roll is from fuel-displaced supreme spraying machine blow-time≤3min among the step C.
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| CN201010237616A CN101892374B (en) | 2010-07-27 | 2010-07-27 | Method for performing heat treatment on high-hardness semisteel roll |
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| CN201010237616A CN101892374B (en) | 2010-07-27 | 2010-07-27 | Method for performing heat treatment on high-hardness semisteel roll |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105349761A (en) * | 2015-11-10 | 2016-02-24 | 铜陵市明诚铸造有限责任公司 | Spray quenching process for alloy semi-steel roll |
| CN107447096A (en) * | 2017-09-22 | 2017-12-08 | 安徽霍山龙鑫金属科技有限公司 | A kind of heat treatment method of non-ferrous metal hot roll |
| CN113265514A (en) * | 2021-04-07 | 2021-08-17 | 石钢京诚装备技术有限公司 | Cooling method for normalizing heat treatment of rolled material with diameter of 150- |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1594604A (en) * | 2004-07-02 | 2005-03-16 | 安徽省宁国市耐磨材料总厂 | Novel process for double medium oil-air quenching of alloy wear resistant casting |
| CN1600875A (en) * | 2004-08-16 | 2005-03-30 | 安徽省宁国市耐磨材料总厂 | Technique for oil quenching casting sphere made from high chrome alloy |
| CN101643825A (en) * | 2009-09-04 | 2010-02-10 | 宁国市南洋铁球有限公司 | Medium chromium multielement alloy cast ball and cast segment oil quenching heat treatment technique |
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- 2010-07-27 CN CN201010237616A patent/CN101892374B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1594604A (en) * | 2004-07-02 | 2005-03-16 | 安徽省宁国市耐磨材料总厂 | Novel process for double medium oil-air quenching of alloy wear resistant casting |
| CN1600875A (en) * | 2004-08-16 | 2005-03-30 | 安徽省宁国市耐磨材料总厂 | Technique for oil quenching casting sphere made from high chrome alloy |
| CN101643825A (en) * | 2009-09-04 | 2010-02-10 | 宁国市南洋铁球有限公司 | Medium chromium multielement alloy cast ball and cast segment oil quenching heat treatment technique |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105349761A (en) * | 2015-11-10 | 2016-02-24 | 铜陵市明诚铸造有限责任公司 | Spray quenching process for alloy semi-steel roll |
| CN107447096A (en) * | 2017-09-22 | 2017-12-08 | 安徽霍山龙鑫金属科技有限公司 | A kind of heat treatment method of non-ferrous metal hot roll |
| CN107447096B (en) * | 2017-09-22 | 2019-01-22 | 安徽霍山龙鑫金属科技有限公司 | A kind of heat treatment method of non-ferrous metal hot roll |
| CN113265514A (en) * | 2021-04-07 | 2021-08-17 | 石钢京诚装备技术有限公司 | Cooling method for normalizing heat treatment of rolled material with diameter of 150- |
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| CN101892374B (en) | 2012-10-03 |
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