CN104313298B - A kind of cold charge heating means of Continuous Casting Bloom of Bearing Steel - Google Patents
A kind of cold charge heating means of Continuous Casting Bloom of Bearing Steel Download PDFInfo
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- CN104313298B CN104313298B CN201410522083.0A CN201410522083A CN104313298B CN 104313298 B CN104313298 B CN 104313298B CN 201410522083 A CN201410522083 A CN 201410522083A CN 104313298 B CN104313298 B CN 104313298B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
Abstract
The invention discloses the cold charge heating means of a kind of Continuous Casting Bloom of Bearing Steel, the method includes preheating I section, preheating II section, heating I section, heating I I sections and soaking zone.The present invention do not produce burning, do not produce face crack, ensure carbide homogeneity up to standard on the premise of, meet Continuous Casting Bloom of Bearing Steel cold charge heating, Rolling Production.
Description
Technical field
The present invention relates to a kind of Field of Heat-treatment, particularly relate to the cold charge heating means of a kind of Continuous Casting Bloom of Bearing Steel.
Background technology
Continuous casting billet needs to be heated to suitable rolling temperature in heating furnace before the rolling, and then rolling is become a useful person.Bearing steel
Due to the requirement such as high fatigue life, high impact loads, to chemical composition uniformity, carbide homogeneity, surface quality etc. in steel
All there is strict demand.It is organized as P+Fe under bearing steel room temperature3C, Continuous Casting Bloom of Bearing Steel heating process is actually P turning to A
Become, carbide spreads and dissolves and the process of austenite homogenization.Continuous casting billet heating technique is to improving or eliminating bearing steel carbon
Compound inhomogeneities has vital effect, if the carbide causing bearing steel stocking unreasonable is exceeded standard by heating technique,
The defects such as face crack, it is impossible to meet standard-required,
Φ 650mm big-diameter bearing steel continuous casting billet is used to be rolled into Φ 160mm～the steel of Φ 280mm, due to Φ 650mm
Cross dimensions is big, and strand certainly exists the feature that distribution of carbides is uneven, this be accomplished by continuous casting billet heating, roll and roll
Rear cooling procedure uses rational technique eliminate or reduce carbide segregation, can not occur that strand burning or surface are split simultaneously
Stricture of vagina defect.Therefore, how to use and reasonably heat technique, make distribution of carbides uniformly, prevent burning, avoid the occurrence of surface
Crackle, becomes the problem that this area engineers and technicians need to solve.
Chinese patent CN101177728 " heating means of a kind of continuous-casting bearing steel bloom " points out that continuous-casting bearing steel is generous
Base in preheating section furnace temperature >=800 DEG C, the time be not less than 1 hour, bringing-up section furnace temperature 1220～1280 DEG C, that the time is not less than 2 is little
Time, soaking zone furnace temperature is at 1200～1260 DEG C, and the time is not less than 3 hours.But research is adding of 280mm × 380mm bloom
Thermal process curve, does not provides preheating section programming rate, and the preheating section and the bringing-up section temperature that are given are too high, are not suitable for Φ 650mm big
The heating requirements of diameter continuous-casting bearing steel.
Φ 650mm super-large diameter continuous casting billet milling is used to become a useful person, owing to Φ 650mm Continuous Casting Bloom of Bearing Steel cross dimensions is big,
Acted on by thermal stress when heating and structural stress, the most sensitive to firing rate, still in the 3rd brittle zone before 900 DEG C, 900
Before DEG C, quick heating then can cause surface crack defect.In theory, the heating-up temperature of steel is solidus, actually due to inclined in steel
Analysis and the existence of non-metallic inclusion, heating is less than solidus temperature it is possible to there is fusing rear oxidation, intercrystalline at crystal boundary
Losing plasticity, form the defects such as burning, therefore, the heating-up temperature of bearing steel then must take into alloying element and forms carbide
Impact, comprehensively will determine according to diagram of forgeability behaviour, deformation resistance curve and metallographic structure with reference to phasor.When heating-up temperature and insulation
Between the longest, austenite composition is more uniform, but crystal grain also can be the thickest, so needing suitable heating-up temperature and the heat time heating time could
Ensure that the carbon of strand center enrichment effectively spreads.Therefore, if with reference to the temperature in above-mentioned document, Φ 650mm can be caused
Continuous Casting Bloom of Bearing Steel is too fast in preheating section firing rate, deposits at high temperature long-time heating in bringing-up section, will certainly cause decarburization
Seriously, the defect such as coarse grains, face crack.
Summary of the invention
It is an object of the invention to, it is provided that the cold charge heating means of a kind of Continuous Casting Bloom of Bearing Steel, the method effectively solves to surpass
Big-diameter bearing steel strand produces the technical problem of face crack because of heating, improves or eliminates the uneven of bearing steel carbide
Property.
For reaching above-mentioned purpose, the technical solution adopted in the present invention is:
A kind of cold charge heating means of Continuous Casting Bloom of Bearing Steel, described method include preheating I section, preheating II section, heating I section,
Heating II section and soaking zone, concrete steps include:
1) preheating I section: Continuous Casting Bloom of Bearing Steel, in I section of heating of preheating, preheats I section of furnace temperature≤600 DEG C, heat time heating time >=4h,
Firing rate≤150 DEG C/h；It is warmed up to preheat II section with the firing rate of≤150 DEG C/h after preheating I section of heating；
2) preheating II section: Continuous Casting Bloom of Bearing Steel, in II section of heating of preheating, preheats II section of furnace temperature≤900 DEG C, heat time heating time >=
2h, 100 DEG C/h of firing rate～200 DEG C/h；It is warmed up to heat I section with the firing rate of≤200 DEG C/h after preheating II section of heating；
3) heating I section: Continuous Casting Bloom of Bearing Steel, in I section of heating of heating, heats I section of furnace temperature≤1050 DEG C, heat time heating time >=1h,
100 DEG C/h of firing rate～200 DEG C/h；It is warmed up to heat II section with the firing rate of≤200 DEG C/h after heating I section of heating；
4) heating II section: Continuous Casting Bloom of Bearing Steel, in II section of heating of heating, heats II section of furnace temperature≤1220 DEG C, heat time heating time >=
4h, 100 DEG C/h of firing rate～200 DEG C/h, wherein High temperature diffusion time >=3h；Soaking zone is entered after heating II section of heating；
5) soaking zone: Continuous Casting Bloom of Bearing Steel when soaking zone heats, soaking zone furnace temperature≤1200 DEG C, the High temperature diffusion time >=
2h。
Preferably, step 1) in, Continuous Casting Bloom of Bearing Steel, when preheating I section of heating, preheats I section of furnace temperature 600 DEG C, heat time heating time
4h, 150 DEG C/h of firing rate.
Preferably, step 1) in, the 150 DEG C/h of firing rate when preheating I section is warmed up to preheat II section.
Preferably, step 2) in, when preheating II section of heating, preheating II section of furnace temperature 900 DEG C, heat time heating time, 2h, heated speed
150 DEG C/h of degree.
Preferably, step 2) in, the 150 DEG C/h of firing rate when preheating II section is warmed up to heat I section.
Preferably, step 3) in, when heating I section of heating, heat I section of furnace temperature 1050 DEG C, heat time heating time 1h；Firing rate
150℃/h。
Preferably, step 3) in, the 150 DEG C/h of firing rate when heating I section is warmed up to heat II section.
Preferably, step 4) in, when heating II section of heating, heat II section of furnace temperature 1200 DEG C, heat time heating time, 4h, heated speed
Degree 150 DEG C/h, wherein High temperature diffusion time 3h.
Preferably, step 5) in, when soaking zone heats, soaking zone furnace temperature 1180 DEG C, High temperature diffusion time 2h.
The present invention is applicable to the diameter big-diameter bearing steel continuous casting billet at more than 650mm, is particularly suited for Φ 650mm the most straight
Footpath Continuous Casting Bloom of Bearing Steel, the cold charge heating means of the present invention use 2 sections of preheatings, 2 sections of heating, laser heating modes of 1 section of soaking,
Rational goes out the programming rate between heating-up temperature, heat time heating time and each section of every section, the section shrinkage of steel when utilizing high temperature
Rate variation with temperature feature, the diffusion principle of segregation element and Φ 650mm big-diameter bearing steel continuous casting billet and continuous way add
The feature of hot stove, is ensureing that carbide inhomogeneities is qualified, steel billet does not produce burning, steel billet occurs without the premise of face crack
Under, by controlling heating-up temperature, firing rate and heat time heating time, to meet the needs of Continuous Casting Bloom of Bearing Steel Rolling Production.
Accompanying drawing explanation
Fig. 1 is the cold charge heating curves schematic diagram of Continuous Casting Bloom of Bearing Steel of the present invention；
Fig. 2 is the liquation figure of the embodiment of the present invention 1 gained round steel；
Fig. 3 is the banded structure figure of the embodiment of the present invention 1 gained round steel.
Detailed description of the invention
With the drawings and specific embodiments, the present invention is further detailed explanation below.
Embodiment 1
The process curve shown in Fig. 1 is used to heat.Φ 650mm Continuous Casting Bloom of Bearing Steel GCr15SiMn enters burial pit and delays
Be as cold as less than 200 DEG C go out hole after, under cold conditions load heating furnace preheat I section begin to warm up, now preheating I section of temperature be 600 DEG C,
Preheat I section of strand to heat 4 hours with the programming rate of 150 DEG C/h；
Strand enters preheating II section with the programming rate of 150 DEG C/h, and the heating-up time is 2h；
Now II section of temperature of preheating is 900 DEG C, heats 2 hours with the programming rate of 150 DEG C/h at II section of strand of preheating；
Strand enters heating I section with the programming rate of 150 DEG C/h, and the heating-up time is 1h；
Now I section of temperature of heating is 1050 DEG C, heats 1 hour with the programming rate of 150 DEG C/h at I section of strand of heating；
Strand enters heating II section with the programming rate of 150 DEG C/h, and the heating-up time is 1h；
Now II section of temperature of heating is 1200 DEG C, and the firing rate at heating 150 DEG C/h of II section of strand heats 4 hours, its
In, High temperature diffusion (insulation) time 3h；
Last strand enters soaking zone, and now soaking zone temperature is 1180 DEG C, heats 2 hours at soaking zone.
The heat time heating time of Φ 650mm Continuous Casting Bloom of Bearing Steel cold conditions shove charge adds up to 17 hours.
Φ 650mm Continuous Casting Bloom of Bearing Steel cold conditions shove charge rolls after heating 17 hours becomes a useful person, and enters the Φ 280mm round steel of rolling
Row low power and mirco structure inspection, macroscopic examination the results are shown in Table 1, and micro test the results are shown in Table 2.By Tables 1 and 2 it can be seen that
Surface bearings steel carbide inhomogeneities controls good, fully meets standard-required.
Table 1 Φ 280mm round steel macroscopic examination result
Table 2 Φ 280mm round steel micro test result
Conventional method is used to detect, liquation and the banded structure of the Φ 280mm round steel of rolling such as Fig. 2 and Fig. 3 institute
Showing, as seen from Figure 2, steel are tested by GB/T18254-2002, and carbide liquid-extraction is substantially 0.5 grade of level, completely
Meet the requirement being not more than 2.5 grades.As seen from Figure 3, carbide strip disclosure satisfy that the requirement of no more than 3.5 grades, rank
Basic 1.0 grades of levels.
Embodiment 2
The process curve shown in Fig. 1 is used to heat.Φ 650mm Continuous Casting Bloom of Bearing Steel GCr15SiMn enters burial pit and delays
Be as cold as less than 200 DEG C go out hole after, under cold conditions load heating furnace preheat I section begin to warm up, now preheating I section of temperature be 550 DEG C,
Preheat I section of strand to heat 5.5 hours with the programming rate of 100 DEG C/h；
Strand enters preheating II section with the programming rate of 100 DEG C/h, and the heating-up time is 4.5h；
Now II section of temperature of preheating is 900 DEG C, heats 3 hours with the programming rate of 100 DEG C/h at II section of strand of preheating；
Strand enters heating I section with the programming rate of 150 DEG C/h, and the heating-up time is 1h；
Now I section of temperature of heating is 1050 DEG C, heats 1.5 hours with the programming rate of 100 DEG C/h at I section of strand of heating；
Strand enters heating II section with the programming rate of 150 DEG C/h, and the heating-up time is 1h；
Now II section of temperature of heating is 1200 DEG C, and the firing rate at heating 150 DEG C/h of II section of strand heats 4.5 hours,
Wherein, High temperature diffusion (insulation) time 3.5h；
Last strand enters soaking zone, and now soaking zone temperature is 1180 DEG C, heats 2.5 hours at soaking zone.
The heat time heating time of Φ 650mm Continuous Casting Bloom of Bearing Steel cold conditions shove charge adds up to 23.5 hours.
Φ 650mm Continuous Casting Bloom of Bearing Steel cold conditions shove charge rolls after heating 23.5 hours becomes a useful person, the Φ 280mm round steel to rolling
Carrying out low power and mirco structure inspection, macroscopic examination the results are shown in Table 3, and micro test the results are shown in Table 4.Can be seen by table 3 and table 4
Going out, surface bearings steel carbide inhomogeneities controls good, fully meets standard-required.
Table 3 Φ 280mm round steel macroscopic examination result
Table 4 Φ 280mm round steel micro test result
Embodiment 3
The process curve shown in Fig. 1 is used to heat.Φ 650mm Continuous Casting Bloom of Bearing Steel GCr15SiMn enters burial pit and delays
Be as cold as less than 200 DEG C go out hole after, under cold conditions load heating furnace preheat I section begin to warm up, now preheating I section of temperature be 600 DEG C,
Preheat I section of strand to heat 4 hours with the programming rate of 150 DEG C/h；
Strand enters preheating II section with the programming rate of 150 DEG C/h, and the heating-up time is 2h；
Now II section of temperature of preheating is 900 DEG C, heats 2 hours with the programming rate of 200 DEG C/h at II section of strand of preheating；
Strand enters heating I section with the programming rate of 200 DEG C/h, and the heating-up time is 0.75h；
Now I section of temperature of heating is 1050 DEG C, heats 1 hour with the programming rate of 200 DEG C/h at I section of strand of heating；
Strand enters heating II section with the programming rate of 200 DEG C/h, and the heating-up time is 0.85h；
Now II section of temperature of heating is 1220 DEG C, and the firing rate at heating 200 DEG C/h of II section of strand heats 4 hours, its
In, High temperature diffusion (insulation) time 3h；
Last strand enters soaking zone, and now soaking zone temperature is 1200 DEG C, heats 2 hours at soaking zone.
The heat time heating time of Φ 650mm Continuous Casting Bloom of Bearing Steel cold conditions shove charge adds up to 16.6 hours.
Φ 650mm Continuous Casting Bloom of Bearing Steel cold conditions shove charge rolls after heating 16.6 hours becomes a useful person, the Φ 280mm round steel to rolling
Carrying out low power and mirco structure inspection, macroscopic examination the results are shown in Table 5, and micro test the results are shown in Table 6.Can be seen by table 5 and table 6
Going out, surface bearings steel carbide inhomogeneities controls good, fully meets standard-required.
Table 5 Φ 280mm round steel macroscopic examination result
Table 6 Φ 280mm round steel micro test result
It should be noted last that, above example is only in order to illustrate technical scheme and unrestricted.Although ginseng
According to embodiment, the present invention is described in detail, it will be apparent to an ordinarily skilled person in the art that the technical side to the present invention
Case is modified or equivalent, and without departure from the spirit and scope of technical solution of the present invention, it all should be contained in the present invention
Right in the middle of.
Claims (9)
1. cold charge heating means for Continuous Casting Bloom of Bearing Steel, described method includes preheating I section, preheating II section, heating I section, adds
Hot II section and soaking zone, concrete steps include:
1) preheating I section: Continuous Casting Bloom of Bearing Steel, in I section of heating of preheating, preheats I section of furnace temperature≤600 DEG C, heat time heating time >=4h, heating
Speed≤150 DEG C/h；It is warmed up to preheat II section with the firing rate of≤150 DEG C/h after preheating I section of heating；
2) preheating II section: Continuous Casting Bloom of Bearing Steel, in preheating II section heating, preheats II section furnace temperature 900 DEG C, heat time heating time >=2h, heating
100 DEG C/h of speed～200 DEG C/h；It is warmed up to heat I section with the firing rate of≤200 DEG C/h after preheating II section heating；
3) heating I section: Continuous Casting Bloom of Bearing Steel, in I section of heating of heating, heats I section of furnace temperature≤1050 DEG C, heat time heating time >=1h, heating
100 DEG C/h of speed～200 DEG C/h；It is warmed up to heat II section with the firing rate of≤200 DEG C/h after heating I section of heating；
4) heating II section: Continuous Casting Bloom of Bearing Steel heats in heating II section, heating II section furnace temperature≤1220 DEG C, heat time heating time >=4h,
100 DEG C/h of firing rate～200 DEG C/h, wherein High temperature diffusion time >=3h；Soaking zone is entered after heating II section heating；
5) soaking zone: Continuous Casting Bloom of Bearing Steel when soaking zone heats, soaking zone furnace temperature≤1200 DEG C, High temperature diffusion time >=2h.
2. the method for claim 1, it is characterised in that: step 1) in, Continuous Casting Bloom of Bearing Steel preheat I section heating time,
Preheat I section of furnace temperature 600 DEG C, heat time heating time 4h, 150 DEG C/h of firing rate.
3. the method for claim 1, it is characterised in that: step 1) in, adding when preheating I section is warmed up to preheat II section
150 DEG C/h of thermal velocity.
4. the method for claim 1, it is characterised in that: step 2) in, when preheating the heating of II section, preheat II section furnace temperature
900 DEG C, heat time heating time 2h, 150 DEG C/h of firing rate.
5. the method for claim 1, it is characterised in that: step 2) in, adding when preheating II section is warmed up to heat I period
150 DEG C/h of thermal velocity.
6. the method for claim 1, it is characterised in that: step 3) in, when heating I section of heating, heat I section of furnace temperature
1050 DEG C, heat time heating time 1h；150 DEG C/h of firing rate.
7. the method for claim 1, it is characterised in that: step 3) in, adding when heating I section is warmed up to heat II section
150 DEG C/h of thermal velocity.
8. the method for claim 1, it is characterised in that: step 4) in, when heating the heating of II section, heat II section furnace temperature
1200 DEG C, heat time heating time 4h, 150 DEG C/h of firing rate, wherein High temperature diffusion time 3h.
9. the method for claim 1, it is characterised in that: step 5) in, when soaking zone heats, soaking zone furnace temperature 1180
DEG C, High temperature diffusion time 2h.
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| CN105886719A (en) * | 2016-05-25 | 2016-08-24 | 内蒙古包钢钢联股份有限公司 | Method for controlling 16 Mn seamless steel tube blank heating |
| 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 |
| CN106086372B (en) * | 2016-08-02 | 2018-05-25 | 内蒙古包钢钢联股份有限公司 | The heating means of seamless steel pipe |
| CN108396133A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A kind of heating means of nickelic steel ingot |
| CN114507775B (en) * | 2021-11-19 | 2023-09-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Heating method for improving primary carbide of ultra-high carbon martensitic stainless steel continuous casting billet |
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| JPH11244901A (en) * | 1998-03-02 | 1999-09-14 | Sanyo Special Steel Co Ltd | Blooming rolling method for improving quality of steel such as ball bearing steel |
| CN101144116A (en) * | 2007-11-13 | 2008-03-19 | 攀钢集团攀枝花钢铁研究院 | Casting blank heating method for controlling surface to generate ferric oxide structure |
| CN100537793C (en) * | 2007-11-30 | 2009-09-09 | 攀钢集团攀枝花钢铁研究院 | A kind of heating means of continuous-casting bearing steel bloom |
| CN100560749C (en) * | 2007-12-19 | 2009-11-18 | 莱芜钢铁集团有限公司 | A kind of heating means that prevent high carbon belt steel bloom decarburization |
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