CN104451048B - A kind of crack resistence boron steel isothermal spheroidizing method - Google Patents
A kind of crack resistence boron steel isothermal spheroidizing method Download PDFInfo
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- CN104451048B CN104451048B CN201410568685.XA CN201410568685A CN104451048B CN 104451048 B CN104451048 B CN 104451048B CN 201410568685 A CN201410568685 A CN 201410568685A CN 104451048 B CN104451048 B CN 104451048B
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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
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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
- C21D1/74—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
- C21D6/00—Heat treatment of ferrous alloys
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to the method for annealing of a kind of steel, especially relate to a kind of crack resistence boron steel isothermal spheroidizing method.Its steel internal organizational structure crystal grain made mainly solved existing for prior art is thick, and hardness is higher, the most cracking, surface galling, and causes product rejection, consumes the technical problem of the substantial amounts of energy etc..The present invention is that high-quality boron steel is heated to 800 850 DEG C of insulations, 650 700 DEG C it are as cold as soon during beginning, it is warmed up to 750 800 DEG C the most rapidly, after carrying out long period insulation, speed with 30 50 C h, it is cooled to 350 400 DEG C of air coolings of coming out of the stove, after isothermal spheroidizing, makes the inside of product have globular pearlite tissue.
Description
Technical field
The present invention relates to the method for annealing of a kind of steel, especially relate to a kind of crack resistence boron steel isothermal spheroidizing method.
Background technology
At present in hardware & tools industry, mostly use the product surface decarburization that common annealing technique is produced, carburetting.Chinese patent discloses the method for annealing (publication number: CN103469090A) of a kind of superhigh-strength hot forming steel, the composition quality percentage composition of its superhigh-strength hot forming steel is: C:0.1-0.5%, Si:1.0-2.0%, Mn:1.0-3.0%, Al:0.01-0.05%, Cr:0.50-1.50%, B:0.001-0.005%, Ti:0.01-0.05%, Nb:0.01-0.05%, P: < 0.01%, S: < 0.01%, N: < 0.01%, surplus is ferrum and inevitable impurity；The superhigh-strength hot forming steel of this composition hot rolled and cold rolling after, make annealing treatment, obtain the substrate steel sheet before hot forming, concrete technology step is as follows: 1) hot rolling and cold-rolling process: hot rolling slab is heated to 1100～1250 DEG C, it is incubated 0.5～1 hour, finishing temperature 800～900 DEG C, coiling temperature 600～700 DEG C；Cold rolling reduction ratio is 70-80%；2) annealing process: cold-rolled steel sheet is slowly heated to two-phase section (α+γ), i.e. A1Temperatures above, for 760-840 DEG C, is incubated 0.1-3h, is then cooled to A with the rate of cooling of 0.1-5 DEG C/s1The most a certain temperature, for 650-720 DEG C, is incubated 0.1-3h, is finally cooled to room temperature with the rate of cooling of 0.1-5 DEG C/s.But making the steel internal organizational structure crystal grain made in this way thick, hardness is higher, the most cracking, surface galling, and causes product rejection, consumes the substantial amounts of energy.
Summary of the invention
The present invention is to provide a kind of crack resistence boron steel isothermal spheroidizing method, its steel internal organizational structure crystal grain made mainly solved existing for prior art is thick, hardness is higher, the most cracking, surface galling, and cause product rejection, consume the technical problem of the substantial amounts of energy etc..
The above-mentioned technical problem of the present invention is mainly addressed by following technical proposals:
A kind of crack resistence boron steel isothermal spheroidizing method of the present invention, it is characterised in that described method includes:
A. feed into stokehold, first with the methanol pipe of air dredging pyrolysis furnace turnover, then the bin even filling material is placed inner bag, cover bell, tighten the handle of lock bell；
B. convection vacuum spheroidizing annealing furnace is used, open main power then to open computer and each run switch and enter operation, it is filled with nitrogen, keep vacuum, it is heated up to when 800-850 DEG C be passed through liquid methanol and divides the carbon layer on surface being cracked into gas to protect material, it is incubated 8-10 hour, material is lowered the temperature, the speed of cooling is 5-8 DEG C/s, cool to 650-700 DEG C, it is incubated 4-6 hour, high temperature resistant needle plate is utilized to process some anticrackings hole at the outer surface of material, then hyperthermic treatment rapidly is carried out, the speed heated up is 5-8 DEG C/s, it is warmed up to 750-800 DEG C and is incubated 4-5 hour, it is cooled to 350-400 DEG C of air cooling of coming out of the stove again with the speed of 30-50 DEG C/h；
C. closing annealing furnace, by each ventilation water flowing valve closing, after vacuum isothermal spheroidizing, the inside of material has globular pearlite tissue, cementite therein to be that spherical particle Dispersed precipitate is less than 0.05 millimeter at ferrite matrix, product surface decarburized layer.
Present invention rapid cooling to 650-700 DEG C after being warmed to 800-850 DEG C carries out isothermal holding, it is warming up to 750-800 DEG C the most rapidly, some unnecessary steel are enable to melt the most rapidly in the anticracking hole being filled up at needle plate processing, so that the stress of ground boron steel outer surface is more consistent, prevent cracking, cool down air cooling of coming out of the stove the most again.The inside of boron steel so can be made to have globular pearlite tissue, cementite therein is that spherical particle Dispersed precipitate is on ferrite matrix, compare with lamellar pearlite, not only hardness is low, and the internal stress of metal has obtained effective release, and the stability of working plasticity product reaches 99% and when Quench heating, easily grow up in austenite crystal portion, during cooling, workpiece deformation is little with tearing tendency has stock utilization height, and production efficiency is good, is suitable for producing in enormous quantities.
As preferably, described step b material, when coming out of the stove air cooling, waits material to cool to 100-150 DEG C, utilizes the waste heat of annealing furnace, with the hot blast of 150-200 DEG C, material is carried out isothermal holding, after being incubated 2-3 hour, closes hot blast and processes, then carry out air cooling.General technique is that air cooling of coming out of the stove can be cooled to room temperature, boron steel.But there is individual defect here, owing to boron steel has certain thickness, during its air cooling, inside and outside temperature is inconsistent, and the temperature outside boron steel declines very fast, the internal more difficult decline of temperature, therefore also can produce stress difference during cooling, can cause and there is inside boron steel some drawing cracks wound.Therefore present invention employs the temperature being first maintained whole boron steel with hot blast so that it is the temperature inside and outside when about 100 DEG C keeps consistent, thus proof stress is consistent, then carries out remaining air cooling, thus can avoid cracking.
As preferably, described high temperature resistant needle plate includes needle plate body, and needle plate body is hinged with some hook-shaped bodies, and hook-shaped body connects pull bar, and pull bar connects driving means.After pressing under needle plate, hook-shaped body can process anticracking hole at the upper surface of boron steel, and driving means can be the device such as cylinder, hydraulic cylinder, and it can pull multiple hook-shaped body by pull bar, makes hook-shaped body deviate from from anticracking is cheated.
Therefore, present invention achieves the cold extrusion essence line after isothermal spheroidizing, have internal structure crystal grain and become complete nodularization shape, hardness reduces, and produces product and occurs without the features such as cracking, plucking phenomenon.
Accompanying drawing explanation
Accompanying drawing 1 is a kind of structural representation of needle plate of the present invention；
Accompanying drawing 2 is a kind of structural representation in anticracking of the present invention hole.
Parts, position and numbering in figure: needle plate body 1, hook-shaped body 2, pull bar 3, boron steel 4, anticracking hole 5.
Detailed description of the invention
Below by embodiment, and combine accompanying drawing, technical scheme is described in further detail.
Embodiment: a kind of crack resistence boron steel isothermal spheroidizing method of this example, the steps include:
A. feed into stokehold, first with the methanol pipe of air dredging pyrolysis furnace turnover, then the bin even filling material is placed inner bag, cover bell, tighten the handle of lock bell；
nullB. convection vacuum spheroidizing annealing furnace is used，Open main power then to open computer and each run switch and enter operation，It is filled with nitrogen，Keep vacuum，It is heated up to when 800 DEG C be passed through liquid methanol and divides the carbon layer on surface being cracked into gas to protect material，It is incubated 9 hours，Material is lowered the temperature，The speed of cooling is 5 DEG C/s，Cool to 700 DEG C，It is incubated 4 hours，Such as Fig. 2，High temperature resistant needle plate is utilized to process some anticrackings hole at the outer surface of material，Such as Fig. 1，High temperature resistant needle plate includes needle plate body 1，Some hook-shaped bodies 2 it are hinged with on needle plate body，Hook-shaped body connects pull bar 3，Pull bar connects cylinder，Then hyperthermic treatment rapidly is carried out，The speed heated up is 8 DEG C/s，It is warmed up to 750 DEG C and is incubated 4 hours，It is cooled to 350 DEG C of air coolings of coming out of the stove again with the speed of 30 DEG C/h，Come out of the stove air cooling time，100 DEG C are cooled to Deng material，Utilize the waste heat of annealing furnace，With the hot blasts of 150 DEG C, material is carried out isothermal holding，After being incubated 2 hours，Closedown hot blast processes；
C. closing annealing furnace, by each ventilation water flowing valve closing, after vacuum isothermal spheroidizing, the inside of material has globular pearlite tissue, cementite therein to be that spherical particle Dispersed precipitate is less than 0.05 millimeter at ferrite matrix, product surface decarburized layer.
The boron steel spherodized structure 5-6 level produced, hardness HRB70-75, it is uniformly distributed nodularization body+ferrite.
The foregoing is only the specific embodiment of the present invention, but the architectural feature of the present invention is not limited thereto, any those skilled in the art is in the field of the invention, and change or the modification made all are contained among the scope of the claims of the present invention.
Claims (2)
1. a crack resistence boron steel isothermal spheroidizing method, it is characterised in that described method includes:
A. feed into stokehold, first with the methanol pipe of air dredging pyrolysis furnace turnover, then the bin even filling material is placed inner bag, cover bell, tighten the handle of lock bell；
B. convection vacuum spheroidizing annealing furnace is used, open main power then to open computer and each run switch and enter operation, it is filled with nitrogen, keep vacuum, it is heated up to when 800-850 DEG C be passed through liquid methanol and divides the carbon layer on surface being cracked into gas to protect material, it is incubated 8-10 hour, material is lowered the temperature, the speed of cooling is 5-8 DEG C/s, cool to 650-700 DEG C, it is incubated 4-6 hour, high temperature resistant needle plate is utilized to process some anticrackings hole at the outer surface of material, then hyperthermic treatment rapidly is carried out, the speed heated up is 5-8 DEG C/s, it is warmed up to 750-800 DEG C and is incubated 4-5 hour, it is cooled to 350-400 DEG C with the speed of 30-50 DEG C/h again come out of the stove；Air cooling after coming out of the stove, waits material to cool to 100-150 DEG C, utilizes the waste heat of annealing furnace, with the hot blast of 150-200 DEG C, material is carried out isothermal holding, after being incubated 2-3 hour, closes hot blast and processes, be further continued for air cooling；
C. closing annealing furnace, by each ventilation water flowing valve closing, after vacuum isothermal spheroidizing, the inside of material has globular pearlite tissue, cementite therein to be that spherical particle Dispersed precipitate is less than 0.05 millimeter at ferrite matrix, product surface decarburized layer.
A kind of crack resistence boron steel isothermal spheroidizing method the most according to claim 1, it is characterized in that described high temperature resistant needle plate includes needle plate body (1), being hinged with some hook-shaped bodies (2) on needle plate body, hook-shaped body connects pull bar (3), and pull bar connects driving means.
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| CN201410568685.XA CN104451048B (en) | 2014-10-23 | 2014-10-23 | A kind of crack resistence boron steel isothermal spheroidizing method |
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| CN201410568685.XA CN104451048B (en) | 2014-10-23 | 2014-10-23 | A kind of crack resistence boron steel isothermal spheroidizing method |
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| CN104451048A CN104451048A (en) | 2015-03-25 |
| CN104451048B true CN104451048B (en) | 2016-11-30 |
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| CN105274308B (en) * | 2015-10-27 | 2017-08-25 | 江苏丰东热处理及表面改性工程技术研究有限公司 | Automobile engine cam vacuum isothermal annealing process |
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| JP3915128B2 (en) * | 1995-09-25 | 2007-05-16 | Ｊｆｅスチール株式会社 | Method of spheroidizing annealing of low alloy steel |
| US6620262B1 (en) * | 1997-12-26 | 2003-09-16 | Nsk Ltd. | Method of manufacturing inner and outer races of deep groove ball bearing in continuous annealing furnace |
| CN1234883C (en) * | 2003-11-01 | 2006-01-04 | 湖南科技大学 | Isothermal spheroidizing technique for H13 steel |
| CN101363073B (en) * | 2008-09-10 | 2010-06-16 | 江苏太平洋精密锻造有限公司 | Isothermal normalizing technology of carburized gears steel forging |
| CN101363077A (en) * | 2008-09-10 | 2009-02-11 | 江苏太平洋精密锻造有限公司 | Isothermal spheroidizing technology of cold precision forging gear blank |
| CN102676762A (en) * | 2012-06-06 | 2012-09-19 | 芜湖金宇紧固件有限公司 | Spheroidizing annealing furnace and annealing process for steel wire |
| CN102876859B (en) * | 2012-10-31 | 2013-12-25 | 东莞市科力钢铁线材有限公司 | Spheroidizing annealing process of screw wire rod |
| CN103014262A (en) * | 2012-11-27 | 2013-04-03 | 大连经济技术开发区圣洁真空技术开发有限公司 | Carbon tool steel spheroidizing annealing process |
| CN102994710B (en) * | 2012-12-28 | 2014-11-26 | 东莞市科力钢铁线材有限公司 | Spheroidizing annealing process of superplasticity fastener wire rod |
| CN103993140A (en) * | 2014-04-19 | 2014-08-20 | 东莞市科力钢铁线材有限公司 | Spheroidizing annealing technology of low-hardness fastener wires |
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