CN101177728A - Method for heating continuous-casting bearing steel bloom - Google Patents

Method for heating continuous-casting bearing steel bloom Download PDF

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Publication number
CN101177728A
CN101177728A CNA2007102027920A CN200710202792A CN101177728A CN 101177728 A CN101177728 A CN 101177728A CN A2007102027920 A CNA2007102027920 A CN A2007102027920A CN 200710202792 A CN200710202792 A CN 200710202792A CN 101177728 A CN101177728 A CN 101177728A
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China
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heating
bearing steel
furnace temperature
preheating
continuous
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CNA2007102027920A
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CN100537793C (en
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柯晓涛
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Pangang Group Steel Vanadium and Titanium Co Ltd
Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
Panzhihua New Steel and Vanadium Co Ltd
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Priority to CNB2007102027920A priority Critical patent/CN100537793C/en
Publication of CN101177728A publication Critical patent/CN101177728A/en
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Publication of CN100537793C publication Critical patent/CN100537793C/en
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Abstract

The invention discloses a heating method of a continuous casting bloom of bearing steel in the thermal treatment field of the metallurgy industry, which is used for heating the continuous casting bloom of the bearing steel. The method effectively solves the problems of long heat preservation time and low production efficiency during the heating process. The method comprises: when the continuous casting bloom of the bearing steel is heated during the preheating section, the furnace temperature in the preheating section is more than or equal to 800 DEG C, and the heat preservation time is not less than 1 hour; when the continuous casting bloom of the bearing steel is heated during the heating section, the furnace temperature in the heating section is between 1220 DEG C-1280 DEG C, and the heat preservation time is not less than 2 hours; when the continuous casting bloom of the bearing steel is heated during the soaking section, the furnace temperature in the soaking section is between 1200 DEG C-1250 DEG C, and the heat preservation time is not less than 3 hours. On the premise that the invention guarantees qualified carbide inhomogeneity and no overburning, the heating temperature is further improved, the heat preservation time is shortened and the production efficiency is improved so as to satisfy the need of producing the continuous casting bloom of the bearing steel in batch.

Description

A kind of heating means of continuous-casting bearing steel bloom
Technical field
The present invention relates to a kind of thermal treatment field, particularly relate to a kind of heating means of bearing steel continuously cast bloom.
Background technology
Usually, continuously cast bloom or steel ingot at first are heated to suitable rolling temperature at process furnace (soaking pit, continuous furnace etc.), are rolled into the shape and the specification of requirement then.Because the bearing steel stocking has regulation to the carbide ununiformity, carbide is one of important alloy phase in the bearing steel, its type, form, quantity, size, distribution have significant effects to the use properties of steel, this creates form, quantity, size and the distribution that certain condition changes carbide when hot-work and the thermal treatment with regard to requiring, and alleviates the disadvantageous effect to steel performance.Form mechanism and feature as can be known by the carbide ununiformity, the non-uniform phenomenon that has carbide in the bearing steel strand to some extent, this just need take proper process measures further to eliminate in the heating of strand, the operation of rolling or reduce carbide segregation, the carbide ununiformity is controlled in the scope of standard code.And the heating process in the strand operation of rolling has material impact to the improvement and the elimination of bearing steel carbide ununiformity.If the unreasonable carbide of bearing steel stocking that will cause of heating process exceeds standard, can not satisfy standard-required, make product degradation or scrap, thereby influence is produced.
In heat-processed, can not get sufficient diffusion if having the strand of serious dendritic segregation, eutectic carbides is dissolving not, the eutectic carbides that is retained in the steel will be fractured into irregular horn shape fritter in the operation of rolling subsequently, distribute along rolling bearing of trend, become the carbide liquation, perhaps the diffusion annealing in the heat-processed only makes the eutectic carbides dissolving, and carbon, fully diffusion is uneven for carbide forming elements such as chromium, be elongated to band through rolling back high concentration region, the cooling back becomes carbide lamellartiy by separating out a large amount of proeutectoid carbide particles in the high density band.In order to reduce the degree of dendritic segregation in the steel, except reasonable crystallization control condition, the diffusion annealing in heat-processed, promptly insulation for a long time at high temperature makes the segregation element diffusion evenly, has important effect to reducing or eliminating the carbide ununiformity.And the diffusion effect of segregation element is relevant with the size of this elemental diffusion coefficient, diffusion time, diffusion unit body.Segregation element at high temperature diffusion process is quickened sharp along with the rising of temperature.So consider that from the angle that improves velocity of diffusion the Heating temperature of high-carbon-chromium bearing steel strand should improve as far as possible.The experience in the heating of bearing steel steel ingot in past shows, it is 1225~1240 ℃ that the fusing of the uniform GCr15 steel of composition begins temperature, for the serious steel ingot of axle center district dendritic segregation, after 1 hour, just begin to occur fusing (burning) phenomenon near the grain-boundary crack hole 1200~1210 ℃ of insulations.The heating cycle of domestic each main factory of bearing steel all is defined in 1220~1240 ℃ to the Heating temperature of GCr15 bearing steel ingot at present.In addition, the effect of diffusion also will depend on the time of diffusion.Strand at high temperature soaking time is longer, diffusion effect better, the dendritic segregation degree can be lower in the steel, the carbide inequality of its stocking is inevitable very little.But long prolongation soaking time will certainly reduce efficiency of equipment, consume more fuel, is uneconomic aborning.Generally when the bearing steel steel ingot was produced, in order to guarantee the effect of carbide ununiformity, about 10 hours, its soaking time was long, production efficiency is low usually for high-temperature holding time.
Summary of the invention
Technical problem to be solved by this invention provides a kind of heating means that can effectively solve the continuous-casting bearing steel bloom that soaking time is long, production efficiency is low.
The technical solution adopted for the present invention to solve the technical problems is: a kind of heating means of continuous-casting bearing steel bloom, comprise preheating section preheating, heating zone heating and soaking zone soaking, and it is characterized in that:
A, continuous-casting bearing steel bloom are when the preheating section preheating, and the preheating section furnace temperature was not less than 1 hour more than or equal to 800 ℃ heat-up time;
When B, continuous-casting bearing steel bloom heated in heating zone, the heating zone furnace temperature was not less than 2 hours between 1220~1280 ℃ heat-up time;
C, continuous-casting bearing steel bloom are when the soaking zone soaking, and the soaking zone furnace temperature was not less than 3 hours between 1200~1260 ℃ heat-up time.
The invention has the beneficial effects as follows, the present invention is characteristics of utilizing the diffusion principle of segregation element and bearing steel continuous casting blooms and continuous furnace, guaranteeing that the carbide ununiformity is qualified and do not producing under the prerequisite overbumt, by further raising Heating temperature, shorten soaking time, enhance productivity, to satisfy the needs that the bearing steel continuously cast bloom is produced in batches.
Description of drawings
Fig. 1 bearing steel continuous casting blooms heating process curve synoptic diagram.
Part among the figure, component names and pairing mark: I thereof represent that heat-up time, II represent furnace temperature, preheating section 1, heating zone 2 and soaking zone 3.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
A kind of heating means of continuous-casting bearing steel bloom, this method is promptly to the continuous casting blooms after rolling off the production line, advancing continuous furnace heats, wherein, continuous-casting bearing steel bloom is when preheating section 1 heating, preheating section 1 furnace temperature II is more than or equal to 800 ℃, preheating section is the temperature in heating zone transmission past, and this section does not have heating function, no burner, controlled by the heating zone temperature, heat-up time, I was not less than 1 hour, generally was not less than 1 hour the meaning, only was incubated 1 hour usually, because on-the-spot consideration production efficiency satisfies minimum requirements and gets final product; Continuous-casting bearing steel bloom is when heating zone 2 heating, the furnace temperature II of heating zone 2 is between 1220~1280 ℃, the furnace temperature II top temperature of heating zone 2 is 1280 ℃, and being higher than this temperature can burn out blank, and furnace temperature can change usually within the specific limits, maximum mobility scale is between 50~60 ℃, heat-up time, I was not less than 2 hours, generally was not less than 2 hours the meaning, normally only was incubated 2 hours, because on-the-spot consideration production efficiency satisfies minimum requirements and gets final product; Continuous-casting bearing steel bloom is when soaking zone 3 heating; soaking zone 3 furnace temperature II are between 1200~1260 ℃; furnace temperature can change usually within the specific limits; maximum mobility scale is between 50~60 ℃; heat-up time, I was not less than 3 hours, generally was not less than 3 hours the meaning, normally only was incubated 3 hours; because on-the-spot consideration production efficiency satisfies minimum requirements and gets final product.It is rolling to come out of the stove after continuous-casting bearing steel bloom reaches soaking time.This method is to utilize the characteristics of diffusion principle and the bearing steel continuous casting blooms and the continuous furnace of segregation element, guaranteeing that the carbide ununiformity is qualified and do not producing under the prerequisite overbumt, by further raising Heating temperature, shorten soaking time, enhance productivity, to satisfy the needs that the bearing steel continuously cast bloom is produced in batches.
Embodiment one: adopt process curve shown in Figure 1 to heat.Specification by the bloom caster cast is the bearing steel continuously cast bloom of 280 * 380mm, the pusher that rolls off the production line is stamped and is cooled to about 150 ℃, through roller-way be delivered to the shove charge of steel-pushing type continuous furnace inlet end enter preheating section 1 begin the heating, this moment, the preheating section furnace temperature was 900 ℃, after advancing 1.5 hours, preheating section enters heating zone, this moment, the heating zone furnace temperature was 1275 ℃, after advancing 2.45 hours, heating zone enters soaking zone, this moment, the soaking zone furnace temperature was 1254 ℃, and coming out of the stove after 3.35 hours in the soaking zone insulation is rolled.150 rolling square steel are carried out the carbide check, the results are shown in Table 1.Show that the control of bearing steel carbide ununiformity is good, satisfy standard-required fully.
Table 1 150 side's carbide assays
Embodiment two: adopt process curve shown in Figure 1 to heat.Specification by the bloom caster cast is the bearing steel continuously cast bloom of 280 * 380mm, roll off the production line after roller-way is delivered to the shove charge of stepped start-stop system continuous furnace inlet end, this moment, continuous casting blank temperature was 515 ℃, the preheating section furnace temperature is 930 ℃, enter heating zone after preheating section was advanced 1 hour, this moment, the heating zone furnace temperature was 1273 ℃, entered soaking zone after heating zone was advanced 2.0 hours, this moment, the soaking zone furnace temperature was 1260 ℃, and coming out of the stove after 3.0 hours in the soaking zone insulation is rolled.150 rolling square steel are carried out the carbide check, the results are shown in Table 2.Show that the control of bearing steel carbide ununiformity is good, satisfy standard-required fully.
Table 2 150 side's carbide assays

Claims (3)

1. the heating means of a continuous-casting bearing steel bloom comprise preheating section (1) preheating, heating zone (2) heating and soaking zone (3) soaking, it is characterized in that:
A, continuous-casting bearing steel bloom are when preheating section (1) preheating, and preheating section (1) furnace temperature (II) is more than or equal to 800 ℃, and heat-up time, (I) was not less than 1 hour;
When B, continuous-casting bearing steel bloom heated in heating zone (2), heating zone (2) furnace temperature (II) was between 1220~1280 ℃, and heat-up time, (I) was not less than 2 hours;
C, continuous-casting bearing steel bloom are when soaking zone (3) soaking, and soaking zone (3) furnace temperature (II) is between 1200~1260 ℃, and heat-up time, (I) was not less than 3 hours.
2. the heating means of a kind of continuous-casting bearing steel bloom as claimed in claim 1, it is characterized in that: preheating section (1) furnace temperature (II) is 900 ℃, be 1.5 hours heat-up time (I); Heating zone (2) furnace temperature (II) is 1275 ℃, and be 2.45 hours heat-up time (I); Soaking zone (3) furnace temperature (II) is 1254 ℃, 3.35 hours heat-up times (I).
3. the heating means of a kind of continuous-casting bearing steel bloom as claimed in claim 1, it is characterized in that: preheating section (1) furnace temperature (II) is 930 ℃, be 1 hour heat-up time (I); Heating zone (2) furnace temperature (II) is 1273 ℃, and be 2.0 hours heat-up time (I); Soaking zone (3) furnace temperature (II) is 1250 ℃, 3.35 hours heat-up times (I).
CNB2007102027920A 2007-11-30 2007-11-30 A kind of heating means of continuous-casting bearing steel bloom Expired - Fee Related CN100537793C (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101403025B (en) * 2008-11-19 2010-04-07 攀枝花新钢钒股份有限公司 Heating method for silicon-containing vanadium steel-containing casting blank
CN102517425A (en) * 2011-12-06 2012-06-27 中冶南方(武汉)威仕工业炉有限公司 Heating process for inhibiting rolling fracture and perforation of 42CrMo hot rolled plate
CN103168112A (en) * 2010-08-31 2013-06-19 杰富意钢铁株式会社 Bearing steel and ingot material for bearing having excellent rolling contact fatigue life characteristics and method for manufacturing the same
CN103290204A (en) * 2013-06-29 2013-09-11 济钢集团有限公司 Process for heating carbon steel and low-alloy steel heavy piece-weight composite blank
CN103316929A (en) * 2012-03-21 2013-09-25 宝山钢铁股份有限公司 Rolling and cooling technology method for reducing GCR15 bearing steel zonary carbide level
CN103667672A (en) * 2013-12-05 2014-03-26 天津钢铁集团有限公司 Technology for inhibiting bending of heated small square-billet bearing steel
CN104313298A (en) * 2014-09-30 2015-01-28 山东钢铁股份有限公司 Cold-charge heating method of bearing steel continuous casting billet
CN105568178A (en) * 2015-12-03 2016-05-11 抚顺特殊钢股份有限公司 New manufacturing process of hot-rolled bar for carburized and quenched gear shaft of automobile transmission
CN106167847A (en) * 2016-07-29 2016-11-30 本钢板材股份有限公司 A kind of method reducing bearing steel carbide segregation
CN108176718A (en) * 2017-12-05 2018-06-19 山东钢铁股份有限公司 A kind of milling method of hypereutectoid steel continuous casting billet
CN109112280A (en) * 2018-08-07 2019-01-01 南京钢铁股份有限公司 A kind of control method of bearing steel wire rod decarburized depth

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1186665A1 (en) * 1983-12-27 1985-10-23 Златоустовский Ордена Трудового Красного Знамени Металлургический Завод Method of heating blooms
CN1236078C (en) * 2003-03-07 2006-01-11 攀枝花钢铁有限责任公司钢铁研究院 Heating method of preventing for high-carbon steel blank or steel ingot from decarbonizing

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101403025B (en) * 2008-11-19 2010-04-07 攀枝花新钢钒股份有限公司 Heating method for silicon-containing vanadium steel-containing casting blank
US9139887B2 (en) 2010-08-31 2015-09-22 Jfe Steel Corporation Bearing steel and ingot material for bearing having excellent rolling contact fatigue life characteristics and method for manufacturing the same
CN103168112B (en) * 2010-08-31 2016-03-23 杰富意钢铁株式会社 The bearing steel of rolling contact fatigue life excellent, bearing ingot casting part and their manufacture method
CN103168112A (en) * 2010-08-31 2013-06-19 杰富意钢铁株式会社 Bearing steel and ingot material for bearing having excellent rolling contact fatigue life characteristics and method for manufacturing the same
CN102517425A (en) * 2011-12-06 2012-06-27 中冶南方(武汉)威仕工业炉有限公司 Heating process for inhibiting rolling fracture and perforation of 42CrMo hot rolled plate
CN103316929A (en) * 2012-03-21 2013-09-25 宝山钢铁股份有限公司 Rolling and cooling technology method for reducing GCR15 bearing steel zonary carbide level
CN103316929B (en) * 2012-03-21 2015-03-04 宝山钢铁股份有限公司 Rolling and cooling technology method for reducing GCR15 bearing steel zonary carbide level
CN103290204A (en) * 2013-06-29 2013-09-11 济钢集团有限公司 Process for heating carbon steel and low-alloy steel heavy piece-weight composite blank
CN103667672A (en) * 2013-12-05 2014-03-26 天津钢铁集团有限公司 Technology for inhibiting bending of heated small square-billet bearing steel
CN103667672B (en) * 2013-12-05 2015-09-09 天津钢铁集团有限公司 A kind of processing method suppressing small billet bearing steel to add hot bending steel
CN104313298A (en) * 2014-09-30 2015-01-28 山东钢铁股份有限公司 Cold-charge heating method of bearing steel continuous casting billet
CN105568178A (en) * 2015-12-03 2016-05-11 抚顺特殊钢股份有限公司 New manufacturing process of hot-rolled bar for carburized and quenched gear shaft of automobile transmission
CN106167847A (en) * 2016-07-29 2016-11-30 本钢板材股份有限公司 A kind of method reducing bearing steel carbide segregation
CN108176718A (en) * 2017-12-05 2018-06-19 山东钢铁股份有限公司 A kind of milling method of hypereutectoid steel continuous casting billet
CN108176718B (en) * 2017-12-05 2020-03-03 山东钢铁股份有限公司 Rolling method of hypereutectoid steel continuous casting billet
CN109112280A (en) * 2018-08-07 2019-01-01 南京钢铁股份有限公司 A kind of control method of bearing steel wire rod decarburized depth

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Address after: 617000 No. 90 Taoyuan Road, Sichuan, Panzhihua

Co-patentee after: Pangang Group Steel Vanadium & Titanium Co., Ltd.

Patentee after: Panzhihua Iron & Steel Research Institute of PanGang Group

Address before: 617000 No. 90 Taoyuan Road, Sichuan, Panzhihua

Co-patentee before: Panzhihua New Steel & Vanadium Co., Ltd.

Patentee before: Panzhihua Iron & Steel Research Institute of PanGang Group

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Granted publication date: 20090909

Termination date: 20161130