CN100537793C - Heating method of continuous casting bearing steel bloom - Google Patents
Heating method of continuous casting bearing steel bloom Download PDFInfo
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- CN100537793C CN100537793C CNB2007102027920A CN200710202792A CN100537793C CN 100537793 C CN100537793 C CN 100537793C CN B2007102027920 A CNB2007102027920 A CN B2007102027920A CN 200710202792 A CN200710202792 A CN 200710202792A CN 100537793 C CN100537793 C CN 100537793C
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- bearing steel
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- furnace temperature
- steel bloom
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000010438 heat treatment Methods 0.000 title claims abstract description 47
- 238000009749 continuous casting Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title abstract description 9
- 238000002791 soaking Methods 0.000 claims abstract description 25
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000004321 preservation Methods 0.000 abstract 5
- 238000009792 diffusion process Methods 0.000 description 16
- 238000005096 rolling process Methods 0.000 description 10
- 238000005204 segregation Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000009413 insulation Methods 0.000 description 4
- 230000005496 eutectics Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 238000003556 assay Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Abstract
The invention discloses a heating method of a continuous casting bearing steel bloom in the field of heat treatment in the metallurgical industry, which is used for heating the continuous casting bearing steel bloom, and effectively solves the problems of long heat preservation time and low production efficiency in the heating process, and the method comprises the following steps: when the continuous casting bearing steel bloom is heated in the preheating section, the furnace temperature of the preheating section is more than or equal to 800 ℃, and the heat preservation time is not less than 1 hour; when the continuous casting bearing steel bloom is heated in the heating section, the furnace temperature of the heating section is 1220-1280 ℃, and the heat preservation time is not less than 2 hours; when the continuous casting bearing steel bloom is heated in the soaking section, the furnace temperature of the soaking section is 1200-1250 ℃, and the heat preservation time is not less than 3 hours. On the premise of ensuring that the nonuniformity of the carbide is qualified and no overburning is generated, the invention further improves the heating temperature, shortens the heat preservation time and improves the production efficiency so as to meet the requirement of the mass production of the bearing steel continuous casting billet.
Description
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 preheating section (1) furnace temperature is 930 ℃, be 1 hour heat-up time; Heating zone (2) furnace temperature is 1273 ℃, and be 2.0 hours heat-up time; Soaking zone (3) furnace temperature is 1250 ℃, 3.35 hours heat-up times.
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 (1)
1, a kind of heating means of continuous-casting bearing steel bloom comprise preheating section (1) preheating, heating zone (2) heating and soaking zone (3) soaking, and it is characterized in that: preheating section (1) furnace temperature is 930 ℃, and be 1 hour heat-up time; Heating zone (2) furnace temperature is 1273 ℃, and be 2.0 hours heat-up time; Soaking zone (3) furnace temperature is 1250 ℃, 3.35 hours heat-up times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007102027920A CN100537793C (en) | 2007-11-30 | 2007-11-30 | Heating method of continuous casting bearing steel bloom |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007102027920A CN100537793C (en) | 2007-11-30 | 2007-11-30 | Heating method of continuous casting bearing steel bloom |
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| CN101177728A CN101177728A (en) | 2008-05-14 |
| CN100537793C true CN100537793C (en) | 2009-09-09 |
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| CNB2007102027920A Expired - Fee Related CN100537793C (en) | 2007-11-30 | 2007-11-30 | Heating method of continuous casting bearing steel bloom |
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Families Citing this family (12)
| 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 |
| JP5400089B2 (en) * | 2010-08-31 | 2014-01-29 | Ｊｆｅスチール株式会社 | Bearing steel excellent in rolling fatigue life characteristics, ingot material for bearing, and production method thereof |
| 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 |
| 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 |
| 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 |
| CN104313298B (en) * | 2014-09-30 | 2016-11-30 | 山东钢铁股份有限公司 | A kind of cold charge heating means of Continuous Casting Bloom of Bearing Steel |
| 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 |
| 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 |
| CN109112280B (en) * | 2018-08-07 | 2020-07-14 | 南京钢铁股份有限公司 | Method for controlling decarburization depth of bearing steel wire |
| CN113528966A (en) * | 2021-07-19 | 2021-10-22 | 新疆八一钢铁股份有限公司 | Production method of steel plate with thickness of 50-80mm for building structure |
Citations (2)
| 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 |
| CN1438334A (en) * | 2003-03-07 | 2003-08-27 | 攀枝花钢铁有限责任公司钢铁研究院 | Heating method for preventing high-carbon steel billet or steel ingot from decarbonizing |
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- 2007-11-30 CN CNB2007102027920A patent/CN100537793C/en not_active Expired - Fee Related
Patent Citations (2)
| 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 |
| CN1438334A (en) * | 2003-03-07 | 2003-08-27 | 攀枝花钢铁有限责任公司钢铁研究院 | Heating method for preventing high-carbon steel billet or steel ingot from decarbonizing |
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| CN101177728A (en) | 2008-05-14 |
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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 |