CN101967541A - Heating method for controlling decarburization in heavy rail billet furnace - Google Patents
Heating method for controlling decarburization in heavy rail billet furnace Download PDFInfo
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Abstract
The invention provides a heating method for controlling decarburization in a heavy rail billet furnace in a heat accumulation heating mode. The heating process comprises a pre-heating section, a heating section and a soaking section. A furnace pressure measurement point is positioned at the pre-heating section; the full furnace is controlled at positive pressure; when the billet temperature is controlled to be less than 1,000 DEG C, the atmosphere in the furnace is oxidizing atmosphere, and the air consumption coefficient is between 1.05 and 1.25; and when the billet temperature is controlled to be more than or equal to 1,000 DEG C, the atmosphere in the furnace is weak reducing atmosphere, the air consumption coefficient is between 0.9 and 1.0. Aiming at the operation and decarburization characteristics of the heat accumulation heating furnace different from the traditional heating furnace, the segment control method is adopted on the control aspects of atmosphere in the furnace and temperature, and a limit low-oxygen concentration burning process is realized. The method has the advantages of low heated billet surface decarburization, low oxidized burning loss, high furnace energy utilization, low pollutant discharge, low production cost and the like, is simple, convenient and feasible, and can achieve good effect of saving materials and energy at the same time of improving the heating quality of products.
Description
Technical field
The invention belongs to the technical field of material heat treatment, specifically be meant a kind of heating means of controlling decarburization in the Properties of Heavy Rail Steel By biscuit furnace.
Background technology
Because the carbon content of Properties of Heavy Rail Steel By is higher, so be easy to take place oxidation and decarburization in the heat-processed before rolling.And the decarburization meeting on rail top layer causes the hardness on rail surface to reduce, and simultaneously wear-resisting, anti-stripping performance descends, and fatigue strength also can reduce.So how effectively to control the decarburized layer deepness of heavy rail product and be technological difficulties in the Rail Production always.
Steel billet surface decarburization layer in heating process in the stove forms influence factor and mainly contains aspect three of atmosphere, heat-up time and the Heating temperatures etc. in the process furnace.Heat-up time is long more, and temperature is high more, and the Decarburized layer of rail is dark more.And be the degree of depth that reducing atmosphere helps reducing the rail Decarburized layer in the soaking pit.
Application number is to disclose a kind of heating means that prevent high-carbon steel billet or steel ingot decarburization in the patent of ZL03117411.6.This method is in high carbon steel heating period or in warming up period, heating period, the whole heat-processed of soak, adopts strong oxidizing property atmosphere heating steel billet or steel ingot.
Application number is to disclose a kind of heating means that prevent high carbon belt steel bloom decarburization in the patent of ZL200710115641.1.This method is to adopt pressure-fired, weak oxide atmosphere heating zone steel billet in heat-processed.
In addition, also having class methods is to prevent the steel billet decarburization at high carbon steel surface applying protecting coat.For example, according to " high carbon steel anti-decarburization supercoat research " in " steel rolling " fourth phase in 1996 literary composition, can make decarburization qualification rate raising 20% at the surperficial stopping off of bearing steel.
More than three kinds of methods that prevent decarburization relative merits and range of application are respectively arranged.Be weak oxide atmosphere in the soaking pit and prevent that the method method of decarburization is simple to operate, but because the combustion air deficiency, fuel can not perfect combustion, has energy dissipation, and enter CO content height in the atmospheric waste gas, contaminate environment.The heating means of strong oxidizing atmosphere have caused the increase of steel billet or steel ingot oxidization burning loss again in the employing stove, have reduced the product lumber recovery.At the surperficial applying protecting coat of steel billet, effective, but increased production cost and working strength of workers, do not fit into the scale operation of Iron And Steel Industry yet.
In addition, these the three kinds methods that prevent decarburization are primarily aimed at the exploitation of traditional heating stove heating mode, are not fairly obvious and use effect for recently emerging Energy-efficient Regenerative Type During process furnace.Recuperative heater has different temperature field in furnace, concentration field and pressure field characteristic with respect to the traditional heating stove and accessory, and directly has influence on the surface decarburization forming process of steel billet when the stove internal heating.At the different operation characteristics of recuperative heater, need the novel method of decarburization in the exploitation control corresponding Properties of Heavy Rail Steel By biscuit furnace.
Summary of the invention
The objective of the invention is according to above-mentioned deficiency, provide a kind of heat accumulating type heating mode that is suitable for scale operation effectively to control the heating means of decarburization in the Properties of Heavy Rail Steel By biscuit furnace down, it is more shallow that this heating means not only can be controlled heavy rail product surface decarburized layer deepness, and can enhance product performance and lumber recovery.
The present invention is achieved through the following technical solutions: a kind of heat accumulating type heating mode is the heating means of the interior decarburization of control Properties of Heavy Rail Steel By biscuit furnace down, and described heat-processed comprises preheating section, heating zone and soaking zone, it is characterized in that: the furnace pressure measuring point is positioned at preheating section; Control full stove and keep malleation; Be oxidizing atmosphere in the stove during control steel billet temperature＜1000 ℃, the air consumption coefficient is between 1.05-1.25; Be weak reducing atmosphere in the stove during control steel billet temperature 〉=1000 ℃, the air consumption coefficient is between 0.9-1.0.
Control full stove air consumption coefficient between 1.0-1.05.
Temperature is between 900-1300 ℃ in the control stove.
Described heating zone is divided into upper segment and lower section, and wherein the Heating temperature of lower section is than the high 10-50 of upper segment ℃.
Rate of heating in the described heating zone is 7-10 ℃/min.
Described heating zone control heats up with top speed.
Use the equipment of the heating means of decarburization in the above-mentioned control Properties of Heavy Rail Steel By biscuit furnace to be the heat accumulating type walking beam heating furnace.
The commutation cycle of described recuperative heater is changed to the most in time with point of fixity furnace temperature value hour to be determined.
The present invention is directed to operation that is different from the traditional heating stove and decarburization characteristics that recuperative heater has, aspect furnace atmosphere and temperature controlling, taked the method for segmentation control, realized a kind of limit low oxygen concentration combustion processes.The present invention passes through to adjust the position of furnace pressure measuring point from the soaking zone to the preheating section, control the comprehensive atmosphere of full stove in a kind of near the neutral Limiting Level, guaranteed that heating billet surface decarburized layer deepness is controlled in the most shallow scope, guaranteed simultaneously the perfect combustion of fuel again, improved energy utilization rate and reduced pollutant emission.The present invention is at the strategy of taking rapid heating aspect the temperature control, shorten heat-up time, rationally determine the recuperative heater commutation cycle simultaneously, to guarantee the Control for Kiln Temperature precision, not only can reduce the formation of billet surface decarburization effectively, simultaneously also the oxidization burning loss of steel billet can be controlled at minimum degree, improve the lumber recovery of product.The present invention with compare in methods such as billet surface applying protecting coats, reduced production cost and labour intensity.The present invention and reducing atmosphere prevent that the method for decarburization from comparing, and having improved can energy utilization rate, reduces pollutant emission.The present invention compares with the heating means of strong oxidizing atmosphere, has reduced the oxidization burning loss of steel billet, improves the product lumber recovery.The present invention has that heating billet surface decarburization is few, oxidization burning loss is low, stove energy utilization height, pollutant emission is low, production cost is low, plurality of advantages such as simple and easy to do, can reach the good result of saving metal material and energy when improving control of industrial furnace home.
Embodiment
Below further specify the present invention by specific embodiment:
Embodiment 1
When producing 50Kg/m level U71Mn high speed heavy rail (carbon content 0.68-0.74%), the rolling line method flow is: and the continuously cast bloom raw material weighs → and heat accumulating type walking beam reheating furnace internal heating → high-pressure water descaling → BD1 cogging → BD2 abnormity is rolling → UEU type tandem universal rolling → hot print → hot saw crop → walking beam cooler cooling.Bloom (the cross dimensions 380 * 280mm) of coming from continuous caster at heat accumulating type walking beam heating furnace internal heating.At first heat the steel billet horizontal positioned and pack in the stove, wide (380mm place, limit face) level, leptoprosopy (280mm place, limit face) is vertical, arranges with minimum spacing between the steel billet in the stove.Because the distribution and the non-uniform Distribution of steel billet surface decarburization layer in heating process in the stove, will be but show horizontal plane a little more than the trend of vertical surface, produce face with leptoprosopy (side) as rail head when rolling, also because leptoprosopy has bigger deflection than wide mask, the practical decarburized depth of rolling back product can be optimized to a best level under the double factor effect simultaneously.With the heating of blast furnace gas double heat storage type mode naked light, heat-processed comprises preheating section, a heating zone, two heating zones and soaking zone to steel billet in process furnace subsequently, and wherein preheating section is not established the burner heat supply point.
Full stove keeps malleation in the heat-processed of steel billet, and the furnace pressure measuring point is arranged in preheating section furnace roof middle part, and the furnace pressure controlling valu remains between the 10-30Pa.Furnace atmosphere is regulated to control the total air consumption coefficient of full stove, controlling valu remains between the 1.0-1.05, wherein low-temperature zone (steel billet temperature＜1000 ℃ time) is under oxidizing atmosphere, the air consumption coefficient is controlled at about 1.05, under weak reducing atmosphere, the air consumption coefficient is controlled at about 0.9 high temperature section (steel billet temperature 〉=1000 ℃ time).Comprehensive atmosphere actual measurement oxygen level is between 0-2% in the stove, and this atmosphere state has guaranteed that promptly heating billet surface decarburized layer deepness is controlled in the most shallow scope, has guaranteed the perfect combustion of fuel simultaneously again, has improved energy utilization rate and has reduced pollutant emission.The recuperative heater commutation cycle determines that for hour state when the commutation cycle was 48s in the present embodiment, the furnace temperature fluctuation value had guaranteed the Control for Kiln Temperature precision by having dropped to 20 ℃ of minimum value more than 100 ℃ with any point furnace temperature cyclic swing value in the stove in the heat-processed.Furnace temperature of heating furnace span of control one heating zone is 1000-1100 ℃, two heating zones are 1200-1250 ℃, soaking zone is 1220-1270 ℃, and the control of lower section temperature exceeds 10-50 ℃ of upper segment temperature, eliminate of the influence of furnace bottom water beam to the steel billet underlaying surface temperature, improve the billet heating temperature homogeneity, shorten heat-up time.The heating zone rate of heating reaches 7 ℃/min, steel billet time inside furnace 200min, owing to take the strategy of rapid heating, further shortened heat-up time, not only can reduce the formation of billet surface decarburization effectively, simultaneously also the oxidization burning loss of steel billet can be controlled at minimum degree, improve the lumber recovery of product.
Embodiment 2
Full stove keeps malleation in the heat-processed of steel billet, and the furnace pressure measuring point is arranged in preheating section furnace roof middle part, and the furnace pressure controlling valu remains between the 10-30Pa.Furnace atmosphere is regulated to control the total air consumption coefficient of full stove, controlling valu remains between the 1.0-1.05, wherein low-temperature zone (steel billet temperature＜1000 ℃ time) is under oxidizing atmosphere, the air consumption coefficient is controlled at about 1.25, under weak reducing atmosphere, the air consumption coefficient is controlled at about 1.0 high temperature section (steel billet temperature 〉=1000 ℃ time).Comprehensive atmosphere actual measurement oxygen level is between 0-2% in the stove, and this atmosphere state has guaranteed that promptly heating billet surface decarburized layer deepness is controlled in the most shallow scope, has guaranteed the perfect combustion of fuel simultaneously again, has improved energy utilization rate and has reduced pollutant emission.The recuperative heater commutation cycle determines that for hour state when the commutation cycle was 48s in the present embodiment, the furnace temperature fluctuation value had guaranteed the Control for Kiln Temperature precision by having dropped to 20 ℃ of minimum value more than 100 ℃ with any point furnace temperature cyclic swing value in the stove in the heat-processed.Furnace temperature of heating furnace span of control one heating zone is 900-1000 ℃, two heating zones are 1000-1150 ℃, soaking zone is 1200-1270 ℃, and the control of lower section temperature exceeds 10-50 ℃ of upper segment temperature, eliminate of the influence of furnace bottom water beam to the steel billet underlaying surface temperature, improve the billet heating temperature homogeneity, shorten heat-up time.The heating zone rate of heating reaches 10 ℃/min, steel billet time inside furnace 160min, owing to take the strategy of rapid heating, further shortened heat-up time, not only can reduce the formation of billet surface decarburization effectively, simultaneously also the oxidization burning loss of steel billet can be controlled at minimum degree, improve the lumber recovery of product.
Embodiment 3
Full stove keeps malleation in the heat-processed of steel billet, and the furnace pressure measuring point is arranged in preheating section furnace roof middle part, and the furnace pressure controlling valu remains between the 10-30Pa.Furnace atmosphere is regulated to control the total air consumption coefficient of full stove, controlling valu remains between the 1.0-1.05, wherein low-temperature zone (steel billet temperature＜1000 ℃ time) is under oxidizing atmosphere, the air consumption coefficient is controlled at about 1.1, under weak reducing atmosphere, the air consumption coefficient is controlled at about 0.95 high temperature section (steel billet temperature 〉=1000 ℃ time).Comprehensive atmosphere actual measurement oxygen level is between 0-2% in the stove, and this atmosphere state has guaranteed that promptly heating billet surface decarburized layer deepness is controlled in the most shallow scope, has guaranteed the perfect combustion of fuel simultaneously again, has improved energy utilization rate and has reduced pollutant emission.The recuperative heater commutation cycle determines that for hour state when the commutation cycle was 48s in the present embodiment, the furnace temperature fluctuation value had guaranteed the Control for Kiln Temperature precision by having dropped to 20 ℃ of minimum value more than 100 ℃ with any point furnace temperature cyclic swing value in the stove in the heat-processed.Furnace temperature of heating furnace span of control one heating zone is 1000-1100 ℃, two heating zones are 1240-1300 ℃, soaking zone is 1220-1270 ℃, and the control of lower section temperature exceeds 10-50 ℃ of upper segment temperature, eliminate of the influence of furnace bottom water beam to the steel billet underlaying surface temperature, improve the billet heating temperature homogeneity, shorten heat-up time.The heating zone rate of heating reaches 9 ℃/min, steel billet time inside furnace 180min, owing to take the strategy of rapid heating, further shortened heat-up time, not only can reduce the formation of billet surface decarburization effectively, simultaneously also the oxidization burning loss of steel billet can be controlled at minimum degree, improve the lumber recovery of product.
After the billet rolling that adopts heating means of the present invention to produce became the heavy rail product of 50Kg/m level, on average about 0.26mm, minimum of a value reached below the 0.18mm, greatly reduces than prior art, has good effect through check table emaciated face carbon-coating thickness.
Claims (8)
1. heating means of controlling decarburization in the Properties of Heavy Rail Steel By biscuit furnace, it is to carry out under the heat accumulating type heating mode, described heat-processed comprises preheating section, heating zone and soaking zone, it is characterized in that: the furnace pressure measuring point is positioned at preheating section; Control full stove and keep malleation; Be oxidizing atmosphere in the stove during control steel billet temperature＜1000 ℃, the air consumption coefficient is between 1.05-1.25; Be weak reducing atmosphere in the stove during control steel billet temperature 〉=1000 ℃, the air consumption coefficient is between 0.9-1.0.
2. the heating means of decarburization is characterized in that: control full stove air consumption coefficient between 1.0-1.05 in the control Properties of Heavy Rail Steel By biscuit furnace according to claim 1.
3. the heating means of decarburization in the control Properties of Heavy Rail Steel By biscuit furnace according to claim 1 is characterized in that: temperature is between 900-1300 ℃ in the control stove.
4. the heating means of decarburization in the control Properties of Heavy Rail Steel By biscuit furnace according to claim 1, it is characterized in that: described heating zone is divided into upper segment and lower section, and wherein the Heating temperature of lower section is than the high 10-50 of upper segment ℃.
5. the heating means of decarburization in the control Properties of Heavy Rail Steel By biscuit furnace according to claim 1, it is characterized in that: the rate of heating in the described heating zone is 7-10 ℃/min.
6. the heating means of decarburization in the control Properties of Heavy Rail Steel By biscuit furnace according to claim 1 is characterized in that: described heating zone control heats up with top speed.
7. use the equipment of the heating means of decarburization in the described control Properties of Heavy Rail Steel By of claim 1 biscuit furnace, it is characterized in that: described equipment is the heat accumulating type walking beam heating furnace.
8. the equipment of the heating means of decarburization in the control Properties of Heavy Rail Steel By biscuit furnace according to claim 7 is characterized in that: the commutation cycle of described process furnace is changed to the most in time with point of fixity furnace temperature value hour to be determined.
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Cited By (12)
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| CN102268518A (en) * | 2011-07-25 | 2011-12-07 | 武汉钢铁(集团)公司 | Test method for heating and decarburization of continuous casting blank of high carbon steel |
| CN103060539A (en) * | 2012-12-31 | 2013-04-24 | 江苏兴达钢帘线股份有限公司 | Method for controlling decarburization of fine heat-treated steel wire |
| CN103667647A (en) * | 2013-12-05 | 2014-03-26 | 武汉钢铁(集团)公司 | Optimization control method for MnS inclusions in heavy rail steel |
| CN104726632A (en) * | 2015-03-19 | 2015-06-24 | 河北钢铁股份有限公司邯郸分公司 | Method capable of enhancing dephosphorization rate of heavy rail steel converter smelting |
| CN105483602A (en) * | 2015-12-16 | 2016-04-13 | 武汉科技大学 | Heating method for thinning heavy rail decarburized layer |
| CN109023044A (en) * | 2018-08-01 | 2018-12-18 | 邯郸钢铁集团有限责任公司 | The method for controlling Properties of Heavy Rail Steel decarburized layer deepness |
| CN109266830A (en) * | 2018-09-29 | 2019-01-25 | 邯郸钢铁集团有限责任公司 | A kind of heating production method controlling high-carbon rail decarburized layer deepness |
| CN111809027A (en) * | 2020-07-20 | 2020-10-23 | 武汉钢铁有限公司 | Heating method of copper-containing high-carbon corrosion-resistant steel rail |
| CN112575155A (en) * | 2020-12-03 | 2021-03-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Process for controlling decarburization layer of steel billet |
| CN113215365A (en) * | 2021-04-25 | 2021-08-06 | 南京钢铁股份有限公司 | Decarburization and consumption reduction method for wire heating furnace |
| CN114789194A (en) * | 2022-04-06 | 2022-07-26 | 邯郸钢铁集团有限责任公司 | Heating rolling method for bearing steel wire rod formed by two-fire |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102240671A (en) * | 2011-07-25 | 2011-11-16 | 武汉钢铁(集团)公司 | Rolling method capable of controlling decarburization of steel rail head |
| CN102268518A (en) * | 2011-07-25 | 2011-12-07 | 武汉钢铁(集团)公司 | Test method for heating and decarburization of continuous casting blank of high carbon steel |
| CN103060539A (en) * | 2012-12-31 | 2013-04-24 | 江苏兴达钢帘线股份有限公司 | Method for controlling decarburization of fine heat-treated steel wire |
| CN103667647A (en) * | 2013-12-05 | 2014-03-26 | 武汉钢铁(集团)公司 | Optimization control method for MnS inclusions in heavy rail steel |
| CN103667647B (en) * | 2013-12-05 | 2016-01-20 | 武汉钢铁(集团)公司 | The optimizing and controlling method of MnS inclusion in Properties of Heavy Rail Steel By |
| CN104726632A (en) * | 2015-03-19 | 2015-06-24 | 河北钢铁股份有限公司邯郸分公司 | Method capable of enhancing dephosphorization rate of heavy rail steel converter smelting |
| CN105483602A (en) * | 2015-12-16 | 2016-04-13 | 武汉科技大学 | Heating method for thinning heavy rail decarburized layer |
| CN105483602B (en) * | 2015-12-16 | 2018-03-09 | 武汉科技大学 | A kind of heating means for reducing heavy rail decarburized layer |
| CN109023044A (en) * | 2018-08-01 | 2018-12-18 | 邯郸钢铁集团有限责任公司 | The method for controlling Properties of Heavy Rail Steel decarburized layer deepness |
| CN109266830A (en) * | 2018-09-29 | 2019-01-25 | 邯郸钢铁集团有限责任公司 | A kind of heating production method controlling high-carbon rail decarburized layer deepness |
| CN111809027A (en) * | 2020-07-20 | 2020-10-23 | 武汉钢铁有限公司 | Heating method of copper-containing high-carbon corrosion-resistant steel rail |
| CN112575155A (en) * | 2020-12-03 | 2021-03-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Process for controlling decarburization layer of steel billet |
| CN113215365A (en) * | 2021-04-25 | 2021-08-06 | 南京钢铁股份有限公司 | Decarburization and consumption reduction method for wire heating furnace |
| CN113215365B (en) * | 2021-04-25 | 2022-10-14 | 南京钢铁股份有限公司 | Decarburization and consumption reduction method for wire heating furnace |
| CN114789194A (en) * | 2022-04-06 | 2022-07-26 | 邯郸钢铁集团有限责任公司 | Heating rolling method for bearing steel wire rod formed by two-fire |
| CN114789194B (en) * | 2022-04-06 | 2023-06-13 | 邯郸钢铁集团有限责任公司 | Two-fire-formed bearing steel wire rod heating and rolling method |
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