CN102352431A - Large-scale high-chrome cast iron roller permissible differential temperature heat treatment - Google Patents
Large-scale high-chrome cast iron roller permissible differential temperature heat treatment Download PDFInfo
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- CN102352431A CN102352431A CN201110313488XA CN201110313488A CN102352431A CN 102352431 A CN102352431 A CN 102352431A CN 201110313488X A CN201110313488X A CN 201110313488XA CN 201110313488 A CN201110313488 A CN 201110313488A CN 102352431 A CN102352431 A CN 102352431A
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Abstract
The invention discloses large-scale high-chrome cast iron roller permissible differential temperature heat treatment, which comprises the technical processes of roller charging ranging, first-stage preheating, second-stage preheating and quenching heating. During the charging, double-layer sleeper iron is used for elevating a roller to a position of the lower rolling surface of the roller with the distance being more than 800 to 950mm from a trolley of a furnace body so that the lower low-temperature region in a furnace is avoided, and simultaneously, the upper flame of the furnace body is also prevented from being directly sprayed onto the roller to cause local overheating and overburning phenomena of the roller. During the quenching heating control operation, the big fire flame is only used for heating, the soft fire flame is not used, the heat is prevented from being concentrated in the upper region in the furnace to cause the nonuniform heating of the roller, and in addition, the big fire heating can realize a stirring effect on the uniformity of the temperature in the furnace. The process solves the problems that the large-scale high-chrome cast iron roller for a middle-width thick plate rolling mill can not be produced by the existing differential temperature furnace because of the specification size characteristic; and the problem that the defects of ununiform temperature, difficult control of hardness uniformity and the like are caused by the adoption of a high-temperature gas furnace is solved.
Description
Technical field
The present invention relates to a kind of thermal treatment process of roll, specifically a kind of accurate differential temperature thermal treatment process of large-scale high-chromium iron-cast roller.
Background technology
Roll is the main and parts that often consume that steel rolling is produced, and the quality of roll quality is directly connected to the height of rolling quality and rolling rate.The internal performance of roll and quality except the characteristic of the cost of material own, mainly are in hot-work, to form.Hot-work is that thermal treatment is to change the tissue of steel through variation of temperature, thereby improves its use properties.
In the production,, propose breaker roll and carry out differential temperature thermal treatment for body surface hardness, depth of hardening zone and the residual stress state that makes large-scale roller further guaranteed and improve.Differential temperature thermal treatment mainly is the part through the rapid heating heat treated part; And make the temperature of this local heating to the tissue generation structural transformation that is enough to make this place; And other regional temperature do not change, organize yet no change basically, finally reach the purpose of effective control workpiece different zones performance.The heat treated type of heating of differential temperature comprises electrically heated, combustion gas heating, flexible electric arc (fan-shaped arc curtain) heating etc., and all is in the differential temperature heat treatment furnace of special use, to carry out.But the differential temperature heat treatment furnace generally is to make to the roll of common size; Be 1 meter even surpass the high-chromium iron-cast roller that wide and heavy plate mill is used in 1 meter the ultra-large type that the differential temperature heat treatment furnace of special does not also meet the principle of low-carbon economy for some special diameter.In order to allow large diameter high-chromium iron-cast roller also can carry out the hot-work of similar differential temperature Principles of Heating Processing, the applicant hopes to adopt the coal gas of high temperature stove of existing device that large diameter high-chromium iron-cast roller is carried out accurate differential temperature thermal treatment.So-called accurate differential temperature is handled and is non-proper differential temperature thermal treatment, just uses the local heating of the heat treated notion control of differential temperature heat treated part.Yet the structure design of coal gas of high temperature stove self and inapplicable is directly carried out accurate differential temperature thermal treatment, prevent the low excessively burner of fire door place temperature except that the bottom at fire door place is provided with one in the coal gas of high temperature stove burner, all the other 10 burners all design on the tops of body of heater.The heating efficiency of each burner is 350,000 kcal/h, and the adjustable size of the heating efficiency of burner is big fire flame when reaching flux peak.Because burner mostly is arranged on the top of body of heater, body of heater inside does not have the furnace atmosphere circulation device, and the upper and lower part temperature difference can reach about 70 ℃, and it is inhomogeneous when thermal treatment, to cause product integral body to be heated easily, causes the hardness of roll body lack of homogeneity.
Summary of the invention
The technical issues that need to address of the present invention provide a kind ofly can carry out accurate differential temperature process of thermal treatment to high-chromium iron-cast roller with the coal gas of high temperature stove.
For solving the problems of the technologies described above, the technical scheme that the present invention adopted is:
The accurate differential temperature thermal treatment of large-scale high-chromium iron-cast roller uses the coal gas of high temperature stove that large-scale high-chromium iron-cast roller is carried out accurate differential temperature thermal treatment, may further comprise the steps,
A. use double-deck pillow iron roll stand frame to be located on the chassis of coal gas of high temperature stove, the lower roll surface of roll is apart from the surperficial 800～900mm of chassis; Mid-way at the upper and lower roll surface of roller body has respectively press-fited the armoured thermocouple that thermometric is used; Chassis is pushed in the coal gas of high temperature stove, close fire door;
B. fs preheating: the holding temperature of fs preheating is 590～650 ℃, and all burner breaker rolls of opening the coal gas of high temperature stove heat, and the flame of control burner ejection is little fire, and making heat-up rate is 5～30 ℃/h; When the temperature of the armoured thermocouple of the upper and lower roll surface of the body of roll all reaches 590～650 ℃, insulation 1h;
C. subordinate phase preheating: the holding temperature of subordinate phase preheating is 690～780 ℃, and the flame of control burner ejection is little fire, and making heat-up rate is 5～30 ℃/h; When the temperature of the armoured thermocouple of the upper and lower roll surface of the body of roll all reaches 690～780 ℃, insulation 1h;
D. quench and heat
D1. after the subordinate phase preheating finishes, make all burners of coal gas of high temperature stove all reach flux peak and heat with the big fire breaker roll;
D2. when the temperature of roll surface on the body of roll reached Ac1+30～60 ℃, 1 burner of incendiary was to close all burners the little fire because of preventing to leak in the coal gas always except that keeping, and made in the coal gas of high temperature stove and the heat on roll top conducts to the bottom of roll; When the temperature of roll surface on the body of roll is reduced to Ac1, opens all burners once more and heat with the big fire breaker roll; So repeatedly, the temperature of roll surface can reach in ℃ scope of Ac1+30～60 simultaneously on the temperature of body of roll lower roll surface and the body of roll;
D3. continue to open all burners and heat, make heat-up rate reach 300-500 ℃/h with the big fire breaker roll; When quenching temperature that the temperature of roll surface on the body of roll is set, 1 burner that in control prevents coal gas, leaks is the little flame, closes other all burners, make in the coal gas of high temperature stove and the heat on roll top to the conduction of the bottom of roll; When the temperature of roll surface on the body of roll is reduced to when being lower than quenching temperature, open all burners once more and heat with the big fire breaker roll; So repeatedly, the temperature of roll surface can reach in the quenching temperature scope of setting simultaneously on the temperature of body of roll lower roll surface and the body of roll;
That D4. is interrupted heats with the big fire breaker roll; The temperature of roll surface on temperature and the body of roll of body of roll lower roll surface is remained in the quenching temperature scope of setting; And the difference of the temperature of roll surface is closed all burners and is stopped the breaker roll heating less than 5 ℃ on the temperature of body of roll lower roll surface and the body of roll;
E. cooling
Roll is hung out from the coal gas of high temperature stove, cool off according to conventional process for cooling.
Further improvement of the present invention is: the upper and lower roll surface at said roller body two ends also respectively press-fit an armoured thermocouple, temperature value, the heat-up rate of the armoured thermocouple of the upper and lower roll surface of the said body of roll got the mean value of respective value of three armoured thermocouples of body of roll the same side.
Because the technical progress of having adopted technique scheme, the present invention to obtain is:
The present invention uses the coal gas of high temperature stove that large-scale high-chromium iron-cast roller is carried out accurate differential temperature process of thermal treatment; Meet the heat treated basic technology section of differential temperature; After breaker roll has carried out twice preheating samming, the temperature increase of roll surface on the roll to certain temperature, is promptly provided certain superheating temperature.This temperature can not too high (promptly can not surpass Ac3), and the too high time that will cause each one of the body of roll to get into austenitizing is inconsistent, causes circumferential body of roll neck inconsistent to the hardness drop.Can not be too low, superheating temperature is too low, will lose the differential temperature thermal effectiveness, causes activity time to prolong simultaneously.This temperature is pressed Ac1+30～60 ℃ control, specifically adjusts according to the specifications and models and the processing requirement of roll.When roll surface on the body of roll during near this superheating temperature, directly open the big fire heating, utilize the stirring action of big fire, rapid heating makes roll surface reach technological temperature fast and is Ac3; Ceasing fire afterwards is incubated, and makes whole skin of the roll reach technological temperature through thermal conduction; The last insulation cooling of carrying out certain hour again makes the roll layer depth of necessarily working obtain enough austenitizing times on the one hand, avoids roll roll surface temperature overtemperature to cause organizing thick on the other hand.
The present invention requires when shove charge; Use double-deck pillow iron with the lower roll surface of roll stand frame height to roll apart from the position more than the chassis 800～950mm of body of heater; This height that sets up carries out with reference to the diameter of roll; To guarantee that the roll top is best apart from the upper of furnace body distance greater than 500mm; For example work as roll diameter and surpass 1000mm, so use double-deck pillow iron that it is high to 900mm～950mm.The purpose of doing like this is to avoid bottom cold zone in the stove, also prevents that upper of furnace body flame is directly injected on the roll and causes roll local superheating, burn-off phenomenon simultaneously.When the present invention operates in quenching heat pulse isothermal CONTROL PROCESS section; Only using the big fire flame heating, and do not use little flame, is in order to prevent that heat from concentrating on stove internal upper part zone; Cause the roll inequality of being heated, and the big fire heating can be to temperature in the stove evenly plays stirring action.Use is the form of each three armoured thermocouple up and down, and the more accurate thermal control that adds that detects and grasp body of roll integral body is convenient to understand whole heating state.
The present invention has fully excavated the potential of existing installation, has solved the high-chromium iron-cast roller that middle wide and heavy plate mill uses and can not use existing differential temperature stove production because of the specification characteristics; Problem because of defectives such as use coal gas of high temperature stove exist Heating temperature inhomogeneous, and uniformity of hardness is wayward.Through statistics; 16 of accurate differential temperature high-chromium iron-cast rollers are produced in June～symbiosis in October, and uniformity of hardness≤4HS reaches 15 and accounts for 93.8%, have only about 50% than uniformity of hardness≤4HS before not implementing; Improved 40%, the qualified hardness rate has also reached nearly 90% simultaneously.
Embodiment
Below in conjunction with embodiment the present invention is explained further details:
The outer field main chemical compositions of high-chromium iron-cast roller
| C | Si | Mn | P | S | Gr | Ni | Mo | V |
| 2.3～2.9 | 0.4～0.9 | 0.5～1.3 | 0～0.04 | 0～0.03 | 12～19 | 0～1.6 | 0.9～1.5 | 0.2～0.7 |
In MG8-019 coal gas of high temperature stove, arranged 0TLU94017-T0301, two high-chromium iron-cast rollers of 0TLU94017-T0302 to carry out accurate differential temperature thermal treatment on July 7, may further comprise the steps:
A. the shove charge of roll is put
Because of the roll diameter of these two rolls surpasses 1000mm, thus use double-deck pillow iron with the position of its high lower roll surface to roll apart from the chassis 900mm of body of heater, above the roll apart from upper of furnace body apart from 600mm.The armoured thermocouple of respectively pressing a thermometric to use in the two ends and the mid-way of the upper and lower roll surface of roller body.Chassis is pushed in the coal gas of high temperature stove, close fire door.After state the armoured thermocouple of the upper and lower roll surface of mentioning of the body of roll temperature value, heat-up rate get the mean value of respective value of three armoured thermocouples of body of roll the same side.
B. fs preheating: the holding temperature of fs preheating is 590～650 ℃.
All burner breaker rolls of opening the coal gas of high temperature stove heat, and the flame of control burner ejection is little fire; Detect armoured thermocouple, making heat-up rate is 5～30 ℃/h, and when the temperature of the armoured thermocouple of the upper and lower roll surface of the body of roll all reached 590～650 ℃, 1 burner that in control prevents coal gas, leaks was the little fiery flame, closes other all burners; Insulation 1h.
C. subordinate phase preheating: the holding temperature of subordinate phase preheating is 690～780 ℃.
All burner breaker rolls of opening the coal gas of high temperature stove once more heat, and the flame of control burner ejection is little fire; Making heat-up rate is 5～30 ℃/h; When the temperature of the armoured thermocouple of the upper and lower roll surface of the body of roll all reached 690～780 ℃, 1 burner that in control prevents coal gas, leaks was the little fiery flame, closes other all burners; Insulation 1h.
D. quench and heat
D1. after the subordinate phase preheating finishes, make all burners of coal gas of high temperature stove all reach flux peak and heat with the big fire breaker roll.
D2. detect armoured thermocouple; When the temperature of roll surface on the body of roll reaches 850～880 ℃; 1 burner of incendiary is to close all burners the little fire because of preventing to leak in the coal gas always except that keeping, and makes the heat that reaches roll top in the coal gas of high temperature stove to the conduction of the bottom of roll; When the temperature of roll surface on the body of roll is reduced to Ac1, opens all burners once more and heat with the big fire breaker roll; So repeatedly, the temperature of roll surface can reach in 850～880 ℃ of scopes simultaneously on the temperature of body of roll lower roll surface and the body of roll.
D3. continue to open all burners and heat, make heat-up rate reach 300～500 ℃/h with the big fire breaker roll; During 920～990 ℃ of quenching temperatures of setting when the temperature of roll surface on the body of roll, 1 burner that in control prevents coal gas, leaks is the little flame, closes other all burners, make in the coal gas of high temperature stove and the heat on roll top to the conduction of the bottom of roll; When the temperature of roll surface on the body of roll is reduced to when being lower than quenching temperature, open all burners once more and heat with the big fire breaker roll; So repeatedly, the temperature of roll surface can reach in the quenching temperature scope of setting simultaneously on the temperature of body of roll lower roll surface and the body of roll.
That D4. is interrupted heats with the big fire breaker roll; The temperature of roll surface on temperature and the body of roll of body of roll lower roll surface is remained in 920～990 ℃ of the quenching temperature scopes of setting; And the difference of the temperature of roll surface is closed all burners and is stopped the breaker roll heating less than 5 ℃ on the temperature of body of roll lower roll surface and the body of roll.
E. cooling
Roll is hung out from the coal gas of high temperature stove, cool off according to conventional process for cooling.
Finished product Hardness results after the accurate differential temperature thermal treatment: the hardness of 0TLU94017-T0301 is 73～76HSD, and the hardness of 0TLU94017-T0302 is 74.5～78HSD, and detected result meets technical requirements (73～78HSD) and uniformity of hardness≤4HS.
Claims (2)
1. the accurate differential temperature thermal treatment of large-scale high-chromium iron-cast roller is characterized in that: uses the coal gas of high temperature stove that large-scale high-chromium iron-cast roller is carried out accurate differential temperature thermal treatment, may further comprise the steps,
A. use double-deck pillow iron roll stand frame to be located on the chassis of coal gas of high temperature stove, the lower roll surface of roll is apart from the surperficial 800～900mm of chassis; Mid-way at the upper and lower roll surface of roller body has respectively press-fited the armoured thermocouple that thermometric is used; Chassis is pushed in the coal gas of high temperature stove, close fire door;
B. fs preheating: the holding temperature of fs preheating is 590～650 ℃, and all burner breaker rolls of opening the coal gas of high temperature stove heat, and the flame of control burner ejection is little fire, and making heat-up rate is 5～30 ℃/h; When the temperature of the armoured thermocouple of the upper and lower roll surface of the body of roll all reaches 590～650 ℃, insulation 1h;
C. subordinate phase preheating: the holding temperature of subordinate phase preheating is 690～780 ℃, and the flame of control burner ejection is little fire, and making heat-up rate is 5～30 ℃/h; When the temperature of the armoured thermocouple of the upper and lower roll surface of the body of roll all reaches 690～780 ℃, insulation 1h;
D. quench and heat
D1. after the subordinate phase preheating finishes, make all burners of coal gas of high temperature stove all reach flux peak and heat with the big fire breaker roll;
D2. when the temperature of roll surface on the body of roll reached Ac1+30～60 ℃, 1 burner of incendiary was to close all burners the little fire because of preventing to leak in the coal gas always except that keeping, and made in the coal gas of high temperature stove and the heat on roll top conducts to the bottom of roll; When the temperature of roll surface on the body of roll is reduced to Ac1, opens all burners once more and heat with the big fire breaker roll; So repeatedly, the temperature of roll surface can reach in ℃ scope of Ac1+30～60 simultaneously on the temperature of body of roll lower roll surface and the body of roll;
D3. continue to open all burners and heat, make heat-up rate reach 300-500 ℃/h with the big fire breaker roll; When quenching temperature that the temperature of roll surface on the body of roll is set, 1 burner that in control prevents coal gas, leaks is the little flame, closes other all burners, make in the coal gas of high temperature stove and the heat on roll top to the conduction of the bottom of roll; When the temperature of roll surface on the body of roll is reduced to when being lower than quenching temperature, open all burners once more and heat with the big fire breaker roll; So repeatedly, the temperature of roll surface can reach in the quenching temperature scope of setting simultaneously on the temperature of body of roll lower roll surface and the body of roll;
That D4. is interrupted heats with the big fire breaker roll; The temperature of roll surface on temperature and the body of roll of body of roll lower roll surface is remained in the quenching temperature scope of setting; And the difference of the temperature of roll surface is closed all burners and is stopped the breaker roll heating less than 5 ℃ on the temperature of body of roll lower roll surface and the body of roll;
E. cooling
Roll is hung out from the coal gas of high temperature stove, cool off according to conventional process for cooling.
2. the accurate differential temperature thermal treatment of large-scale high-chromium iron-cast roller according to claim 1; It is characterized in that: the upper and lower roll surface at said roller body two ends also respectively press-fit an armoured thermocouple, temperature value, the heat-up rate of the armoured thermocouple of the upper and lower roll surface of the said body of roll got the mean value of respective value of three armoured thermocouples of body of roll the same side.
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| CN103436679A (en) * | 2013-07-30 | 2013-12-11 | 中钢集团邢台机械轧辊有限公司 | Differential temperature heat treatment method of minor-diameter high chromium cast-iron roll |
| CN103611599A (en) * | 2013-10-23 | 2014-03-05 | 浙江双金机械集团股份有限公司 | All-weather conical sand maker and self-adjustment method |
| CN103667665A (en) * | 2013-12-06 | 2014-03-26 | 天津重型装备工程研究有限公司 | Differential temperature thermal processing method for high-chromium cast steel centrifugation composite working roll |
| CN104087742A (en) * | 2014-06-24 | 2014-10-08 | 河北钢铁股份有限公司唐山分公司 | Differential temperature heat treatment method for centrifugal compound high-chromium steel roller |
| CN104513887A (en) * | 2014-12-26 | 2015-04-15 | 中钢集团邢台机械轧辊有限公司 | Method for annealing finished rollers through bogie-hearth resistance furnace |
| CN105296735A (en) * | 2015-10-27 | 2016-02-03 | 中钢集团邢台机械轧辊有限公司 | Differential-temperature heat treating method for roller |
| CN107988479A (en) * | 2017-12-29 | 2018-05-04 | 中钢集团邢台机械轧辊有限公司 | A kind of quasi- differential temperature heat treatment method of large scale roll |
| CN109593944A (en) * | 2018-12-07 | 2019-04-09 | 鞍钢铸钢有限公司 | A kind of heat treatment process of casting roll |
| CN111101077A (en) * | 2018-10-26 | 2020-05-05 | 宝山钢铁股份有限公司 | Low-cost high-wear-resistance stretch reducing roller and heat treatment process thereof |
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| CN103436679B (en) * | 2013-07-30 | 2014-10-08 | 中钢集团邢台机械轧辊有限公司 | Differential temperature heat treatment method of minor-diameter high chromium cast-iron roll |
| CN103436679A (en) * | 2013-07-30 | 2013-12-11 | 中钢集团邢台机械轧辊有限公司 | Differential temperature heat treatment method of minor-diameter high chromium cast-iron roll |
| CN103611599A (en) * | 2013-10-23 | 2014-03-05 | 浙江双金机械集团股份有限公司 | All-weather conical sand maker and self-adjustment method |
| CN103611599B (en) * | 2013-10-23 | 2015-04-01 | 浙江双金机械集团股份有限公司 | All-weather conical sand maker and self-adjustment method |
| CN103667665A (en) * | 2013-12-06 | 2014-03-26 | 天津重型装备工程研究有限公司 | Differential temperature thermal processing method for high-chromium cast steel centrifugation composite working roll |
| CN103667665B (en) * | 2013-12-06 | 2015-10-28 | 天津重型装备工程研究有限公司 | Cast steel with high chromium centrifugal compound working roll differential temperature heat treating method |
| CN104087742A (en) * | 2014-06-24 | 2014-10-08 | 河北钢铁股份有限公司唐山分公司 | Differential temperature heat treatment method for centrifugal compound high-chromium steel roller |
| CN104513887B (en) * | 2014-12-26 | 2016-09-07 | 中钢集团邢台机械轧辊有限公司 | A kind of trolley resistance furnace method for annealing to polishing roll |
| CN104513887A (en) * | 2014-12-26 | 2015-04-15 | 中钢集团邢台机械轧辊有限公司 | Method for annealing finished rollers through bogie-hearth resistance furnace |
| CN105296735A (en) * | 2015-10-27 | 2016-02-03 | 中钢集团邢台机械轧辊有限公司 | Differential-temperature heat treating method for roller |
| CN105296735B (en) * | 2015-10-27 | 2018-01-05 | 中钢集团邢台机械轧辊有限公司 | A kind of roll differential temperature heat treatment method |
| CN107988479A (en) * | 2017-12-29 | 2018-05-04 | 中钢集团邢台机械轧辊有限公司 | A kind of quasi- differential temperature heat treatment method of large scale roll |
| CN107988479B (en) * | 2017-12-29 | 2020-07-17 | 中钢集团邢台机械轧辊有限公司 | Quasi-differential temperature heat treatment method for large-size roller |
| CN111101077A (en) * | 2018-10-26 | 2020-05-05 | 宝山钢铁股份有限公司 | Low-cost high-wear-resistance stretch reducing roller and heat treatment process thereof |
| CN111101077B (en) * | 2018-10-26 | 2021-08-17 | 宝山钢铁股份有限公司 | Low-cost high-wear-resistance stretch reducing roller and heat treatment process thereof |
| CN109593944A (en) * | 2018-12-07 | 2019-04-09 | 鞍钢铸钢有限公司 | A kind of heat treatment process of casting roll |
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