CN103602798A - Method for heat treatment on high-hardness semi-steel roller - Google Patents
Method for heat treatment on high-hardness semi-steel roller Download PDFInfo
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- CN103602798A CN103602798A CN201310624180.6A CN201310624180A CN103602798A CN 103602798 A CN103602798 A CN 103602798A CN 201310624180 A CN201310624180 A CN 201310624180A CN 103602798 A CN103602798 A CN 103602798A
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Abstract
The invention relates to a method for heat treatment on a high-hardness semi-steel roller. The method comprises the following steps of 1, heating a whole roller to a normalizing temperature of 950-1000 DEG C and carrying out heat preservation for 15-30h, 2, fast hoisting the roller out of the heating furnace and putting the roller into quenching oil for cooling lasting for 20-30min, 3, fast hoisting the roller, transferring the roller on a spraying machine and carrying out air-blast cooling, and 4, carrying out air cooling when the surface temperature of the roller is in a range of 300-480 DEG C and is not increased. The method utilizes an oil cooling-air blast cooling grading quenching method to replace a spray cooling process in normalizing treatment, and through appropriate control on oil cooling time and cooling temperatures in different stages, the theory that semi-steel and cast iron materials cannot be subjected to water cooling or oil cooling is broken through. Through control on air quantity and blowing intensity, the roller is slowly cooled at a certain cooling rate so that austenite is slowly transformed into bainite until complete transformation.
Description
Technical field
The present invention relates to a kind of heat treating method of high rigidity semisteel roll.
Background technology
Semisteel roll be generally on heavy merchant mill for rolling section bar, rolling mill for hot rolled planks and strips roughing etc., in the material of semisteel roll, carbon content is generally very high, approaches the carbon content of cast iron, the hardness requirement of this type of roll is also higher.According to traditional thermal treatment process, to half steel and cast iron materials, can not adopt quench treatment, 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 large specification high-carbon semisteel roll, past prior heat treatment process is to adopt spraying thermal treatment process, and its normalizing temperature is generally 900-950 ℃, and normalizing adopts spray cooling 15-20 minute, then quenching to 480 ℃ after coming out of the stove.Because heat-eliminating medium is the miscellany of wind and water, because water is very fast in the cooling rate of low thermophase, can cause the cooling uniformity of roller surface and final cooling temperature to be difficult to control.In the situation that the even final cooling temperature of roller surface inhomogeneous cooling is lower, all can crack, guarantee the semisteel roll hardness requirement of high rigidity, blast, hydraulic pressure large during spray cooling are necessary, if water spray intensity is too low, hardness cannot meet technical requirements.When but if in process of cooling, the water yield is larger; inevitably can make again roll surface cooling inhomogeneous; often can make local surfaces temperature drop 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 like this roller surface to form stress crack.Along with the increase of roll specification, the increase that heat treatment stress can be at double, crackle tendency also sharply increases, and this is that semisteel roll institute is unallowed, once roll has crackle to scrap.While adopting current method to produce, be not to occur that crackle is exactly hardness deficiency, uniformity of hardness is also very poor, and scrap rate is very high.In heat treatment process, occurring crackle and scrap and be the FAQs of thermal treatment work because cooling deficiency makes product hardness problem on the low side, is again conflicting between the two, is difficult to take into account simultaneously.
Summary of the invention
For problems of the prior art, the object of the present invention is to provide a kind of technical scheme of heat treating method of high rigidity semisteel roll.
The heat treating method of described a kind of high rigidity semisteel roll, it is characterized in that: each components based on weight percentage of this roll is: C:1.6-2.1%, Si:0.6-1.2%, Mn:0.4-0.8%, S≤0.03%, Cr:1.5-2.0%, Mo:0.2-0.5%, Ni:3.6-3.9%, Cu:0.2-1.0%, all the other are Fe and inevitable impurity, roller body diameter is 850-1350mm, the heat treating method of this roll comprises the following steps: 1) roll integral body is heated to normalizing temperature 950-1000 ℃, and is incubated 15-30h; 2) rapidly roll is hung out to process furnace, put into the cooling 20-30 minute of quenching oil, make roller surface temperature reach 230-250 ℃, the temperature of 50mm depths is 270-300 ℃, the temperature 400-450 ℃ of 100mm depths; Roll is less than or equal to 5min from coming out of the stove to entering the oil time; 3) roll is hung rapidly and on spraying machine, carry out quenching, blast keeps 0.25-0.35MPa, roller surface temperature is less than equal 480 ℃ and temperature no longer to raise, and progressively lowers blast, the cooling rate of whole air-cooled process is controlled at 2-5 ℃/min, and whole blow-time is 50-80min; Roll is less than or equal to 3min from fuel-displaced supreme spraying machine blow-time; 4) when roller surface temperature can remain on below 480 ℃ more than 300 ℃ and while no longer raising, air cooling.
The heat treating method of described a kind of high rigidity semisteel roll, it is characterized in that described each components based on weight percentage of roll is: C:1.7-2.0%, Si:0.8-1.0%, Mn:0.5-0.7%, S≤0.028%, Cr:1.6-1.9%, Mo:0.25-0.45%, Ni:3.65-3.85%, Cu:0.4-0.8%, all the other are Fe and inevitable impurity.
The heat treating method of described a kind of high rigidity semisteel roll, is characterized in that in described step 1), soaking time is 20-25h.
The heat treating method of described a kind of high rigidity semisteel roll, is characterized in that in described step 3), blow-time is 60-70min.
The present invention has changed the conventional heat treating method of semisteel roll, changes the spray cooling in 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 Slow cooling under certain speed of cooling, reach and do not make the working lining being quenched return temperature, also do not make roll cooling too fast, austenite is slowly changed, until be finally transformed into bainite 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 large-scale semisteel roll of high rigidity more than 55HSD.
Embodiment
The heat treating method of high rigidity semisteel roll of the present invention, each components based on weight percentage of roll is: C:1.6-2.1%, Si:0.6-1.2%, Mn:0.4-0.8%, S≤0.03%, Cr:1.5-2.0%, Mo:0.2-0.5%, Ni:3.6-3.9%, Cu:0.2-1.0%, all the other are Fe and inevitable impurity, roller body diameter is 850-1350mm, the heat treating method of this roll comprises the following steps: 1) roll integral body is heated to normalizing temperature 950-1000 ℃, and is incubated 15-30h; 2) rapidly roll is hung out to process furnace, put into the cooling 20-30 minute of quenching oil, make roller surface temperature reach 230-250 ℃, the temperature of 50mm depths is 270-300 ℃, the temperature 400-450 ℃ of 100mm depths; Roll is less than or equal to 5min from coming out of the stove to entering the oil time; 3) roll is hung rapidly and on spraying machine, carry out quenching, blast keeps 0.25-0.35MPa, roller surface temperature is less than equal 480 ℃ and temperature no longer to raise, and progressively lowers blast, the cooling rate of whole air-cooled process is controlled at 2-5 ℃/min, and whole blow-time is 50-80min; Roll is less than or equal to 3min from fuel-displaced supreme spraying machine blow-time; 4) when roller surface temperature can remain on below 480 ℃ more than 300 ℃ and while no longer raising, air cooling.
As preferably, each components based on weight percentage of roll is: C:1.7-2.0%, Si:0.8-1.0%, Mn:0.5-0.7%, S≤0.028%, Cr:1.6-1.9%, Mo:0.25-0.45%, Ni:3.65-3.85%, Cu:0.4-0.8%, all the other are Fe and inevitable impurity.
Above-mentioned steps 1) in, soaking time is 20-25h, and in step 3), blow-time is 60-70min.
The present invention has changed the conventional heat treating method of semisteel roll, changes the spray cooling in 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 Slow cooling under certain speed of cooling, reach and do not make the working lining being quenched return temperature, also do not make roll cooling too fast, austenite is slowly changed, until be finally transformed into bainite 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 large-scale semisteel roll of high rigidity more than 55HSD.
Claims (4)
1. the heat treating method of a high rigidity semisteel roll, it is characterized in that: each components based on weight percentage of this roll is: C:1.6-2.1%, Si:0.6-1.2%, Mn:0.4-0.8%, S≤0.03%, Cr:1.5-2.0%, Mo:0.2-0.5%, Ni:3.6-3.9%, Cu:0.2-1.0%, all the other are Fe and inevitable impurity, roller body diameter is 850-1350mm, the heat treating method of this roll comprises the following steps: 1) roll integral body is heated to normalizing temperature 950-1000 ℃, and is incubated 15-30h; 2) rapidly roll is hung out to process furnace, put into the cooling 20-30 minute of quenching oil, make roller surface temperature reach 230-250 ℃, the temperature of 50mm depths is 270-300 ℃, the temperature 400-450 ℃ of 100mm depths; Roll is less than or equal to 5min from coming out of the stove to entering the oil time; 3) roll is hung rapidly and on spraying machine, carry out quenching, blast keeps 0.25-0.35MPa, roller surface temperature is less than equal 480 ℃ and temperature no longer to raise, and progressively lowers blast, the cooling rate of whole air-cooled process is controlled at 2-5 ℃/min, and whole blow-time is 50-80min; Roll is less than or equal to 3min from fuel-displaced supreme spraying machine blow-time; 4) when roller surface temperature can remain on below 480 ℃ more than 300 ℃ and while no longer raising, air cooling.
2. the heat treating method of a kind of high rigidity semisteel roll according to claim 1, it is characterized in that described each components based on weight percentage of roll is: C:1.7-2.0%, Si:0.8-1.0%, Mn:0.5-0.7%, S≤0.028%, Cr:1.6-1.9%, Mo:0.25-0.45%, Ni:3.65-3.85%, Cu:0.4-0.8%, all the other are Fe and inevitable impurity.
3. the heat treating method of a kind of high rigidity semisteel roll according to claim 1, is characterized in that in described step 1), soaking time is 20-25h.
4. the heat treating method of a kind of high rigidity semisteel roll according to claim 1, is characterized in that in described step 3), blow-time is 60-70min.
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| CN201310624180.6A CN103602798A (en) | 2013-12-02 | 2013-12-02 | Method for heat treatment on high-hardness semi-steel roller |
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| CN201310624180.6A CN103602798A (en) | 2013-12-02 | 2013-12-02 | Method for heat treatment on high-hardness semi-steel roller |
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Cited By (8)
| 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 |
| CN105821329A (en) * | 2016-04-28 | 2016-08-03 | 宁国市开源电力耐磨材料有限公司 | High-strength and low-chromium forge material and preparing method thereof |
| CN107354284A (en) * | 2017-06-29 | 2017-11-17 | 太仓市钧胜轧辊有限公司 | A kind of Technology for Heating Processing for 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 |
| CN107488772A (en) * | 2017-08-21 | 2017-12-19 | 宜兴市永昌轧辊有限公司 | A kind of cold roll hardening and tempering method |
| CN107794349A (en) * | 2017-12-25 | 2018-03-13 | 徐州安诚矿山设备有限公司 | A kind of high temperature process for quenching of iron |
| CN111057835A (en) * | 2019-12-30 | 2020-04-24 | 中钢集团邢台机械轧辊有限公司 | Method for controlling structure performance of working layer of centrifugal roller |
| 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- |
-
2013
- 2013-12-02 CN CN201310624180.6A patent/CN103602798A/en active Pending
Cited By (10)
| 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 |
| CN105821329A (en) * | 2016-04-28 | 2016-08-03 | 宁国市开源电力耐磨材料有限公司 | High-strength and low-chromium forge material and preparing method thereof |
| CN107354284A (en) * | 2017-06-29 | 2017-11-17 | 太仓市钧胜轧辊有限公司 | A kind of Technology for Heating Processing for roll |
| CN107488772A (en) * | 2017-08-21 | 2017-12-19 | 宜兴市永昌轧辊有限公司 | A kind of cold roll hardening and tempering method |
| 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 |
| CN107794349A (en) * | 2017-12-25 | 2018-03-13 | 徐州安诚矿山设备有限公司 | A kind of high temperature process for quenching of iron |
| CN111057835A (en) * | 2019-12-30 | 2020-04-24 | 中钢集团邢台机械轧辊有限公司 | Method for controlling structure performance of working layer of centrifugal roller |
| CN111057835B (en) * | 2019-12-30 | 2021-11-19 | 中钢集团邢台机械轧辊有限公司 | Method for controlling structure performance of working layer of centrifugal roller |
| 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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Application publication date: 20140226 |