CN106191396A - Cold formability 65Mn hot rolled steel plate Fast Spheroidizing Annealing method - Google Patents
Cold formability 65Mn hot rolled steel plate Fast Spheroidizing Annealing method Download PDFInfo
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- CN106191396A CN106191396A CN201610674681.9A CN201610674681A CN106191396A CN 106191396 A CN106191396 A CN 106191396A CN 201610674681 A CN201610674681 A CN 201610674681A CN 106191396 A CN106191396 A CN 106191396A
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- steel plate
- insulation
- hot rolled
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- rolled steel
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of cold formability 65Mn hot rolled steel plate Fast Spheroidizing Annealing method, the step such as including double annealing.The present invention has the beneficial effect that the annealing cycle is short, nodularization efficiency is high.
Description
Technical field
The present invention relates to hot rolled steel plate annealing field, specifically a kind of cold formability 65Mn hot rolled steel plate Fast Spheroidizing Annealing
Method.
Background technology
65Mn steel has good hardenability, wearability, higher intensity etc., is widely used in traffic transport industry each
Plant flat spring and high-wearing feature constitutional detail.Hot rolling 65Mn steel plate has thick lamella pearlite, and intensity is higher, and plasticity is poor,
Carry out cold forming and add follow-up and be typically difficult to straight forming man-hour, need to carry out spheroidizing process, to obtain enough plasticity,
Meet the forming requirements such as clod wash, punching press, and be that follow-up Quenching Treatment adjusts tissue.
The disperse of spherodized structure, tiny quality directly affect nodularization effect, and commercial production there is a need for being able to quickly, have
Effect, succinct Process planning flow.The Oxygen potential of steel tissue and the granule size of carbide particle and uniformity are to material
Cold formability has and directly affects.The patent now announced such as CN104294156A uses bell furnace in Ac1 temperature above and below
Carry out long-time heat preservation, to obtain high Oxygen potential, improve cold forming capability.Long term annealing limits carrying of production efficiency
Height, is easily caused surface of steel plate decarburization serious, and coil of strip internal-external temperature difference is big, temperature retention time differs, and steel inevitably cause indulging
Uneven to hardness, easily occur that cold-forming property fluctuates.
The steel grades such as isothermal annealed processes can be substantially reduced the spheroidizing cycle, existing mainly GCr15 steel, the shear steel announced
Spheroidizing technology.Such as CN102382949A patent, disclose the isothermal ball of a kind of shield cutter steel 5Cr5MoSiV1
Annealing method, the annealing cycle, 8～16h, is that subsequent heat treatment technique is prepared by spheroidizing.But object of study is not
With, and the purpose of annealing is different with concrete control process.
Affect the principal element of nodularization effect except annealing process, the also factor such as hot-strip original structure.In
High-carbon steel is easy to produce banded segregation in front operation, and these segregations can form the high-carbon region of strip, and carbide is difficult to one
Complete nodularization during secondary spheroidizing, directly affects cold forming processing.
Summary of the invention
The invention aims to solve the deficiency that above-mentioned background technology exists, propose that a kind of annealing cycle is short, nodularization
The cold formability 65Mn hot rolled steel plate Fast Spheroidizing Annealing method that efficiency is high.
In order to realize object above, a kind of cold formability 65Mn hot rolled steel plate Fast Spheroidizing Annealing side that the present invention provides
Method, it is characterised in that comprise the steps:
1) being filled with protective gas in continuous annealing furnace, atmosphere is 80～100%N2With 0～20%H2, by 65Mn steel plate liter
Temperature to more than Ac3 20～50 DEG C, i.e. 785～815 DEG C, controls the heating-up time 10～20min, then insulation 10～15min；
2) the 65Mn steel plate after insulation is cooled to below Ar1 10～20 DEG C, i.e. 669～679 DEG C, is incubated 10～20min；
3) 65Mn steel plate is warming up to below Ac3 10～30 DEG C again, i.e. 735～755 DEG C, controls programming rate 0.3～1
DEG C/s, it is incubated 10～30min；
4) the 65Mn steel plate after insulation again is cooled to below Ar1 5～10 DEG C, i.e. 684～679 DEG C, is incubated 2～4h；
5) cooling to the 65Mn steel after insulation again with the furnace 600 ± 5 DEG C, air cooling of coming out of the stove, to room temperature, completes spheroidizing.
As the preferred version of the present invention, described step 2) be: the 65Mn steel plate after being incubated is with the speed of 0.5～6 DEG C/s
Degree is cooled to below Ar1 10～20 DEG C, i.e. 669～679 DEG C, is incubated 10～20min.
Further, described step 4) be: the 65Mn steel plate after insulation again is cooled to by the speed of 20～50 DEG C/h
Below Ar1 5～10 DEG C, be incubated 2～4h by i.e. 684～679 DEG C.
When the present invention adjusts steel original structure state, the holding temperature of spheroidizing, insulation by double annealing
Between and rate of temperature fall, improve spheroidizing efficiency, improve spheroidizing effect, reduce the problem that plate property is uneven.
Accompanying drawing explanation
Fig. 1 is the process curve schematic diagram of the present invention；
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
For ensureing that this method is effectively implemented, the thickness of selected hot rolling 65Mn steel plate is 1.5～4.0mm.Continuous annealing
Stove is filled with industrial nitrogen and hydrogen purity is 99.99%, to keep steel plate not occur under inert atmosphere or weakly reducing atmosphere
Oxidation and decarbonization.
Embodiment: select 65Mn hot rolled steel plate thick for 2mm, its composition is by weight percentage containing C 0.58～0.70%, Si
0.17～0.37%, Mn 0.80～0.12%, Cr 0.20～0.60%, P≤0.002%, S≤0.035%, surplus is Fe.
1) being filled with protective gas in continuous annealing furnace, atmosphere is 80～100%N2With 0～20%H2, by 65Mn steel plate liter
Temperature to more than Ac3 20～50 DEG C, i.e. 785～815 DEG C, controls the heating-up time 10～20min, then insulation 10～15min；
2) the 65Mn steel plate after insulation is cooled to below Ar1 10～20 DEG C, i.e. 669～679 DEG C, is incubated 10～20min；
3) 65Mn steel plate is warming up to below Ac3 10～30 DEG C again, i.e. 735～755 DEG C, controls programming rate 0.3～1
DEG C/s, it is incubated 10～30min；
4) the 65Mn steel plate after insulation again is cooled to below Ar1 5～10 DEG C, i.e. 684～679 DEG C, is incubated 2～4h；
5) cooling to the 65Mn steel after insulation again with the furnace 600 ± 5 DEG C, air cooling of coming out of the stove, to room temperature, completes spheroidizing.
Described step 1) in first time insulating process, its principle be by more than Ac3 control holding temperature and insulation time
Between, make the quick austenitizing of 65Mn steel plate, original structure is adjusted in austenite cooling procedure the tissue of homogenization, and molten
Solve segregated zone medium high carbon region carbide, alleviate the banded segregation in steel plate.Control heating-up time, holding temperature and time are avoided
Crystal grain is grown up.
Described step 2) in first time cooling procedure, its principle is by controlling the cooling rate in austenite cooling procedure, shape
Become tiny carbide core or territory, carbon-rich zone.Avoid the product of pearlite, especially coarse pearlity and granular ferrite simultaneously
Raw, reduce the temperature retention time of follow-up nodularization.Because thick flaky carbide needs insulation ability for a long time molten disconnected, and the easy shape of nodularization
Become large particle carbide, skewness；Forming big granular ferrite, inside does not has rich carbon " microcell ", and carbon is difficult to distance
It is diffused into inside ferrite, after causing spheroidizing, still suffers from without cementite or few cementite region.
Described step 3), 4), 5) etc. during, its principle is by being incubated at two-phase section, makes pearlite carbide
Dissolving ruptures, and forms carbide core, controls cooling rate and isothermal temperature, controls carbide particle size and distributing homogeneity.
By the carbide graininess spherical in shape after the spheroidizing that above procedure obtains, uniformly, Dispersed precipitate is at matrix
In, without the appearance of bulk ferrite area, the region that also carbides-free is assembled, whole cross section and longitudinal hardness number 165～
181HBW, spherodized structure metallographic is graded at 2～3 grades.
Compared with prior art, present invention have an advantage that
1, carbide particle is tiny, be evenly distributed, essentially eliminate corynebacterium, short flaky carbide, it is to avoid carbide
Gathering occur.
2, prevent steel plate oxidation and decarbonization, the distribution of annealing tailing edge section hardness is the most more uniform, it is to avoid steel plate the exterior and the interior and vertical
Differ to direction different parts tissue, performance.
3, annealing time is shorter, and the annealing cycle is shortened to 6～8h by 12～20h, and production efficiency is high, saves the energy, reduces
Cost.
4, process implementing is simple, it is simple to industrial mass production.
The above, be only presently preferred embodiments of the present invention, and not the structure to the present invention is done any pro forma
Limit.Every any simple modification, equivalent variations and modification above example made according to the technical spirit of the present invention, all
Still fall within the range of technical scheme.
Claims (3)
1. a cold formability 65Mn hot rolled steel plate Fast Spheroidizing Annealing method, it is characterised in that comprise the steps:
1) being filled with protective gas in continuous annealing furnace, atmosphere is 80～100%N2With 0～20%H2, 65Mn steel plate is warming up to
More than Ac3 20～50 DEG C, control the heating-up time 10～20min, then insulation 10～15min by i.e. 785～815 DEG C；
2) the 65Mn steel plate after insulation is cooled to below Ar1 10～20 DEG C, i.e. 669～679 DEG C, is incubated 10～20min；
3) 65Mn steel plate is warming up to below Ac3 10～30 DEG C again, i.e. 735～755 DEG C, control programming rate 0.3～1 DEG C/
S, is incubated 10～30min；
4) the 65Mn steel plate after insulation again is cooled to below Ar1 5～10 DEG C, i.e. 684～679 DEG C, is incubated 2～4h；
5) cooling to the 65Mn steel after insulation again with the furnace 600 ± 5 DEG C, air cooling of coming out of the stove, to room temperature, completes spheroidizing.
Cold formability 65Mn hot rolled steel plate Fast Spheroidizing Annealing method the most according to claim 1, it is characterised in that: described
Step 2) be: the 65Mn steel plate after insulation is cooled to below Ar1 10～20 DEG C, i.e. 669～679 with the speed of 0.5～6 DEG C/s
DEG C, it is incubated 10～20min.
Cold formability 65Mn hot rolled steel plate Fast Spheroidizing Annealing method the most according to claim 1, it is characterised in that: described
Step 4) be: again 65Mn steel plate after insulation will be cooled to below Ar1 5～10 DEG C by the speed of 20～50 DEG C/h, i.e. 684～
679 DEG C, it is incubated 2～4h.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610674681.9A CN106191396A (en) | 2016-08-16 | 2016-08-16 | Cold formability 65Mn hot rolled steel plate Fast Spheroidizing Annealing method |
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| CN201610674681.9A CN106191396A (en) | 2016-08-16 | 2016-08-16 | Cold formability 65Mn hot rolled steel plate Fast Spheroidizing Annealing method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019001262A1 (en) * | 2017-06-28 | 2019-01-03 | 武汉理工大学 | Process for forming, by means of warm ring rolling, high-carbon chromium bearing steel capable of structure spheroidization |
| CN110004274A (en) * | 2019-05-15 | 2019-07-12 | 埃斯科特钢有限公司 | A kind of ML40Cr hot rolling wire annealing process |
| CN113832311A (en) * | 2021-09-30 | 2021-12-24 | 北京科技大学 | Method for producing rapid spheroidizing special steel |
| CN114686655A (en) * | 2022-04-06 | 2022-07-01 | 河北工业大学 | Rapid spheroidizing annealing method for GCr15 steel |
| CN115323128A (en) * | 2022-07-01 | 2022-11-11 | 江阴兴澄合金材料有限公司 | Spheroidizing annealing process based on bell-type furnace GCr15 wire rod |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019001262A1 (en) * | 2017-06-28 | 2019-01-03 | 武汉理工大学 | Process for forming, by means of warm ring rolling, high-carbon chromium bearing steel capable of structure spheroidization |
| CN110004274A (en) * | 2019-05-15 | 2019-07-12 | 埃斯科特钢有限公司 | A kind of ML40Cr hot rolling wire annealing process |
| CN110004274B (en) * | 2019-05-15 | 2020-12-29 | 埃斯科特钢有限公司 | ML40Cr hot-rolled wire spheroidizing annealing process |
| CN113832311A (en) * | 2021-09-30 | 2021-12-24 | 北京科技大学 | Method for producing rapid spheroidizing special steel |
| CN114686655A (en) * | 2022-04-06 | 2022-07-01 | 河北工业大学 | Rapid spheroidizing annealing method for GCr15 steel |
| CN114686655B (en) * | 2022-04-06 | 2023-12-08 | 河北工业大学 | Rapid spheroidizing annealing method for GCr15 steel |
| CN115323128A (en) * | 2022-07-01 | 2022-11-11 | 江阴兴澄合金材料有限公司 | Spheroidizing annealing process based on bell-type furnace GCr15 wire rod |
| CN115323128B (en) * | 2022-07-01 | 2023-10-20 | 江阴兴澄合金材料有限公司 | Spheroidizing annealing process based on bell-type furnace GCr15 wire rod |
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Effective date of registration: 20170629 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Applicant after: Wuhan iron and Steel Company Limited Address before: 430083 Qingshan District, Hubei, Wuhan Applicant before: WUHAN IRON AND STEEL CORPORATION |
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Application publication date: 20161207 |