CN104451048A - Anti-cracking boron steel isothermal spheroidizing annealing method - Google Patents
Anti-cracking boron steel isothermal spheroidizing annealing method Download PDFInfo
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- CN104451048A CN104451048A CN201410568685.XA CN201410568685A CN104451048A CN 104451048 A CN104451048 A CN 104451048A CN 201410568685 A CN201410568685 A CN 201410568685A CN 104451048 A CN104451048 A CN 104451048A
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- boron steel
- isothermal spheroidizing
- cooling
- needle plate
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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
Abstract
The invention relates to a steel annealing method, and in particular relates to an anti-cracking boron steel isothermal spheroidizing annealing method, for mainly solving the technical problems that in the prior art a product can be scrapped, a great deal of energy is consumed and the like as a prepared steel material is coarse in internal tissue structural crystal grain, slightly high in hardness and easy to crack in the production process, and the surface can be roughened. The method comprises the following steps: heating high-quality boron steel to be 800-850 DEG C, keeping the temperature, rapidly cooling to be 650-700 DEG C, rapidly heating to be 750-800 DEG C, cooling to be 350-400 DEG C in a speed of 30-50 DEG C/h after the temperature is kept for a relatively long time, discharging outside a furnace, cooling in air, and performing isothermal spheroidizing annealing, thereby forming globular pearlite tissue inside a product.
Description
Technical field
The present invention relates to a kind of method for annealing of steel, especially relate to a kind of crack resistence boron steel isothermal spheroidizing method.
Background technology
In current hardware & tools industry, mostly adopt the product surface decarburization that common annealing explained hereafter goes out, carburetting.Chinese patent discloses a kind of method for annealing (publication number: CN103469090A) 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%, and surplus is iron and inevitable impurity; The superhigh-strength hot forming steel of this composition through hot rolling and cold rolling after, carry out anneal, obtain the substrate steel sheet before thermoforming, concrete technology step is as follows: 1) hot rolling and cold-rolling process: hot rolling slab is heated to 1100 ~ 1250 DEG C, be incubated 0.5 ~ 1 hour, finishing temperature 800 ~ 900 DEG C, coiling temperature 600 ~ 700 DEG C; Cold rolling draft is 70-80%; 2) annealing process: cold-rolled steel sheet is slowly heated to two-phase region (α+γ), i.e. A
1above temperature is 760-840 DEG C, and insulation 0.1-3h, is then chilled to A with the speed of cooling of 0.1-5 DEG C/s
1a certain temperature is below 650-720 DEG C, and insulation 0.1-3h, is finally chilled to room temperature with the speed of cooling of 0.1-5 DEG C/s.But make the steel internal organizational structure crystal grain made in this way thick, hardness is higher, easily occurs cracking in process of production, surface galling, and causes product rejection, consume a large amount 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, easily there is cracking in process of production, surface galling, and cause product rejection, consume the technical problem of a large amount of energy etc.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
A kind of crack resistence boron steel isothermal spheroidizing method of the present invention, is characterized in that described method comprises:
A. feed into stokehold, first with the methyl alcohol pipe of air dredging pyrolyzer 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 adopted, open general supply then to open computer and each run switch and enter operation, be filled with nitrogen, keep vacuum, heat to passing into liquid methanol during 800-850 DEG C and divide and be cracked into gas to protect the carbon layer on surface of material, insulation 8-10 hour, material is lowered the temperature, the speed of cooling is 5-8 DEG C/s, cool to 650-700 DEG C, insulation 4-6 hour, high temperature resistant needle plate is utilized to process some anticrackings hole at the outside surface of material, then hyperthermic treatment is rapidly carried out, the speed heated up is 5-8 DEG C/s, be warmed up to 750-800 DEG C of insulation 4-5 hour, 350-400 DEG C of air cooling of coming out of the stove is cooled to again with the speed of 30-50 DEG C/h,
C. close annealing furnace, by each ventilation water flowing valve closes, after vacuum isothermal Spheroidizing Annealing, there is globular pearlite tissue the inside of material, cementite be wherein spherical particle Dispersed precipitate at ferrite matrix, product surface Decarburized layer is less than 0.05 millimeter.
The present invention's rapid cooling after being warmed to 800-850 DEG C carries out isothermal holding to 650-700 DEG C, be warming up to 750-800 DEG C rapidly again, some unnecessary steel are melted rapidly again and is filled up in the anticracking hole of needle plate processing place, thus make the stress of ground boron steel outside surface more consistent, prevent cracking, finally cool air cooling of coming out of the stove again.There is globular pearlite tissue such inside of boron steel that can make, cementite is wherein that spherical particle Dispersed precipitate is on ferrite matrix, compare with lamellar pearlite, not only hardness is low, and the internal stress of metal obtains effective release, and the stability of working plasticity product reaches 99% and when Quench heating, easily grow up in austenite crystal portion, during cooling, little to have material use efficiency high for workpiece deformation and tearing tendency, and production efficiency is good, is applicable to 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, carries out isothermal holding with the hot blast of 150-200 DEG C to material, is incubated after 2-3 hour, closes hot blast process, then carries out air cooling.General technique comes out of the stove air cooling to room temperature, and boron steel can be cooled.But there is individual defect here, because boron steel has certain thickness, during its air cooling, inside and outside temperature is inconsistent, and the temperature of boron steel outside declines very fast, the inner more difficult decline of temperature, therefore also can produce stress-difference during cooling, boron steel inside can be caused to have some drawing cracks wound.Therefore present invention employs the temperature being first maintained whole boron steel with hot blast, its inside and outside temperature about 100 DEG C time is consistent, thus proof stress is consistent, then carry out remaining air cooling, will avoid like this cracking.
As preferably, described high temperature resistant needle plate includes needle plate body, and needle plate body is hinged with some hook-shaped bodies, hook-shaped body is connected with pull bar, pull bar connecting drive device.After needle plate presses down, hook-shaped body can process anticracking hole at the upper surface of boron steel, and drive unit can be the device such as cylinder, hydro-cylinder, and it can pull multiple hook-shaped body by pull bar, and hook-shaped body is deviate from from anticracking hole.
Therefore, present invention achieves the essence of the cold extrusion after isothermal spheroidizing line, have internal structure crystal grain and become complete nodularization shape, hardness reduces, and produces product and does not occur cracking, the features such as 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 representations in anticracking of the present invention hole.
Component, position and numbering in figure: needle plate body 1, hook-shaped body 2, pull bar 3, boron steel 4, anticracking hole 5.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention 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 methyl alcohol pipe of air dredging pyrolyzer 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 adopted, open general supply then to open computer and each run switch and enter operation, be filled with nitrogen, keep vacuum, heat to passing into liquid methanol when 800 DEG C and divide and be cracked into gas to protect the carbon layer on surface of material, be incubated 9 hours, material is lowered the temperature, the speed of cooling is 5 DEG C/s, cool to 700 DEG C, be incubated 4 hours, as Fig. 2, high temperature resistant needle plate is utilized to process some anticrackings hole at the outside surface of material, as Fig. 1, high temperature resistant needle plate includes needle plate body 1, needle plate body is hinged with some hook-shaped bodies 2, hook-shaped body is connected with pull bar 3, pull bar connects cylinder, then hyperthermic treatment is rapidly carried out, the speed heated up is 8 DEG C/s, be warmed up to 750 DEG C of insulations 4 hours, 350 DEG C of air coolings of coming out of the stove are cooled to 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, isothermal holding is carried out to material, be incubated after 2 hours, close hot blast process,
C. close annealing furnace, by each ventilation water flowing valve closes, after vacuum isothermal Spheroidizing Annealing, there is globular pearlite tissue the inside of material, cementite be wherein spherical particle Dispersed precipitate at ferrite matrix, product surface Decarburized layer is less than 0.05 millimeter.
The boron steel spherodized structure 5-6 level produced, hardness HRB70-75, is uniformly distributed nodularization body+ferrite.
The foregoing is only specific embodiments of the invention, but constitutional features of the present invention is not limited thereto, any those skilled in the art is in the field of the invention, and the change done or modification are all encompassed among the scope of the claims of the present invention.
Claims (3)
1. a crack resistence boron steel isothermal spheroidizing method, is characterized in that described method comprises:
A. feed into stokehold, first with the methyl alcohol pipe of air dredging pyrolyzer 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 adopted, open general supply then to open computer and each run switch and enter operation, be filled with nitrogen, keep vacuum, heat to passing into liquid methanol during 800-850 DEG C and divide and be cracked into gas to protect the carbon layer on surface of material, insulation 8-10 hour, material is lowered the temperature, the speed of cooling is 5-8 DEG C/s, cool to 650-700 DEG C, insulation 4-6 hour, high temperature resistant needle plate is utilized to process some anticrackings hole at the outside surface of material, then hyperthermic treatment is rapidly carried out, the speed heated up is 5-8 DEG C/s, be warmed up to 750-800 DEG C of insulation 4-5 hour, 350-400 DEG C of air cooling of coming out of the stove is cooled to again with the speed of 30-50 DEG C/h,
C. close annealing furnace, by each ventilation water flowing valve closes, after vacuum isothermal Spheroidizing Annealing, there is globular pearlite tissue the inside of material, cementite be wherein spherical particle Dispersed precipitate at ferrite matrix, product surface Decarburized layer is less than 0.05 millimeter.
2. a kind of crack resistence boron steel isothermal spheroidizing method according to claim 1, it is characterized in that described step b material is when coming out of the stove air cooling, 100-150 DEG C is cooled to Deng material, utilize the waste heat of annealing furnace, with the hot blast of 150-200 DEG C, isothermal holding is carried out to material, be incubated after 2-3 hour, close hot blast process, then carry out air cooling.
3. a kind of crack resistence boron steel isothermal spheroidizing method according to claim 1, it is characterized in that described high temperature resistant needle plate includes needle plate body (1), needle plate body is hinged with some hook-shaped bodies (2), hook-shaped body is connected with pull bar (3), pull bar connecting drive device.
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| Application Number | Priority Date | Filing Date | Title |
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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 true CN104451048A (en) | 2015-03-25 |
| CN104451048B CN104451048B (en) | 2016-11-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105274308A (en) * | 2015-10-27 | 2016-01-27 | 江苏丰东热技术股份有限公司 | Vacuum isothermal spheroidizing process for automobile engine cam |
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| JPH0987736A (en) * | 1995-09-25 | 1997-03-31 | Kawasaki Steel Corp | Method for spheroidizing annealing low alloy steel |
| WO1999034023A1 (en) * | 1997-12-26 | 1999-07-08 | Nsk Ltd. | Continuous annealing furnace, rolling bearing, annealing method, and method of manufacturing inner and outer races of deeply groove ball bearing |
| CN1540001A (en) * | 2003-11-01 | 2004-10-27 | 湖南科技大学 | Isothermal spheroidizing technique for H13 steel |
| CN101363073A (en) * | 2008-09-10 | 2009-02-11 | 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 |
| CN102876859A (en) * | 2012-10-31 | 2013-01-16 | 东莞市科力钢铁线材有限公司 | Spheroidizing annealing process of screw wire rod |
| CN102994710A (en) * | 2012-12-28 | 2013-03-27 | 东莞市科力钢铁线材有限公司 | Spheroidizing annealing process of superplasticity fastener 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 |
| 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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2014
- 2014-10-23 CN CN201410568685.XA patent/CN104451048B/en not_active Expired - Fee Related
Patent Citations (10)
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|---|---|---|---|---|
| JPH0987736A (en) * | 1995-09-25 | 1997-03-31 | Kawasaki Steel Corp | Method for spheroidizing annealing low alloy steel |
| WO1999034023A1 (en) * | 1997-12-26 | 1999-07-08 | Nsk Ltd. | Continuous annealing furnace, rolling bearing, annealing method, and method of manufacturing inner and outer races of deeply groove ball bearing |
| CN1540001A (en) * | 2003-11-01 | 2004-10-27 | 湖南科技大学 | Isothermal spheroidizing technique for H13 steel |
| CN101363073A (en) * | 2008-09-10 | 2009-02-11 | 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 |
| CN102876859A (en) * | 2012-10-31 | 2013-01-16 | 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 |
| CN102994710A (en) * | 2012-12-28 | 2013-03-27 | 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105274308A (en) * | 2015-10-27 | 2016-01-27 | 江苏丰东热技术股份有限公司 | Vacuum isothermal spheroidizing process for automobile engine cam |
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| CN104451048B (en) | 2016-11-30 |
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Granted publication date: 20161130 Termination date: 20171023 |