CN103993140A - Spheroidizing annealing technology of low-hardness fastener wires - Google Patents
Spheroidizing annealing technology of low-hardness fastener wires Download PDFInfo
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- CN103993140A CN103993140A CN201410157040.7A CN201410157040A CN103993140A CN 103993140 A CN103993140 A CN 103993140A CN 201410157040 A CN201410157040 A CN 201410157040A CN 103993140 A CN103993140 A CN 103993140A
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Abstract
The invention discloses a spheroidizing annealing technology of low-hardness fastener wires. The technology comprises the following steps: 1, putting fastener wires in a heat treatment furnace, introducing a protection gas to the heat treatment furnace, heating to make the temperature in the furnace rise to 710-730DEG C, and carrying out heat insulation for 2-4h; 2, first stage cooling: cooling to 660-680DEG C according to a cooing speed of 20DEG C/h, and carrying out heat insulation for 2-4h; 3, second stage cooling: cooling to 600-620DEG C according to a cooing speed of 10DEG C/h; and 4, third stage cooling: naturally cooling the fastener wires to normal temperature. The fastener wires treated by using the technology have the advantages of uniform microstructure, fine crystal grains, low hardness, high toughness, high ductility, meeting of high-difficulty multi-time plasticity molding requirements of faster products, and low cracking rate.
Description
technical field:
The present invention relates to the annealing process of metallic substance, be specifically related to a kind of carbide annealing process of soft fastening piece wire rod.
background technology:
Spheroidizing Annealing is one of Basic Ways of improving structure of steel and performance, the main purpose of Spheroidizing Annealing is the carbide spheroidization making in the microtexture of ferrous materials, reduces the hardness of material, improves the plasticity of material, the resistance to deformation that reduces material, makes material be easy to plastic working moulding.Fastening piece, for two or more parts (or member) being fastenedly connected to the general name that becomes class mechanical component that adopt when whole, will obtain ideal performance and tissue in fastening piece wire rod is produced, and key is to select suitable carbide annealing process.
Publication number is that the Chinese invention patent of CN1245524C has been introduced a kind of spheroidal annealing, workpiece is put into annealing furnace, control acid extraction, carry out annealing process, it is characterized in that taking following method and step: a, employing mechanical pump to extract fast annealing furnace air in annealing process, while forming the vacuum tightness of 10-50pa in stove, mechanical pump quits work, to passing into purity in stove, be 99.8% industrial nitrogen immediately, when furnace pressure reaches the positive pressure of 1500-2500pa, stop filling nitrogen; B, along with slowly release in stove, when Pressure Drop is during to the positive pressure of 150-300pa, repeating step a; The step of c, above " intermittent vacuum+filling nitrogen " repeats, until annealing process finishes.According to existing technique, fastening piece wire rod is carried out to Spheroidizing Annealing, its operation is too complicated, and difficult quality is controlled simultaneously, and its metallographic structure is inhomogeneous, hardness is higher, poor toughness, there is crackle in large quantities of fastening piece wire rods, especially for production riveting, screw tight firmware after cold-formed, more strict to its requirement, often do not reach user's demand, directly cause the fastening piece wire rod of producing to be scrapped, have a strong impact on quality and the lumber recovery of fastening piece wire rod.
summary of the invention:
The object of the invention is to overcome the deficiency that prior art exists, a kind of carbide annealing process of soft fastening piece wire rod is provided, adopt fastening piece wire rod metallographic structure after processing method of the present invention is processed evenly, close grain, hardness is low, toughness is high, ductility is high, meet the fastener products requirement to highly difficult repeatedly plastic working moulding, formed product cracking rate is low.
Object of the present invention is achieved through the following technical solutions:
A carbide annealing process for soft fastening piece wire rod, it in turn includes the following steps:
A, fastening piece wire rod is placed in to heat treatment furnace, in heat treated stove, is filled with shielding gas, then the temperature in stove is risen to 710-730 ℃, insulation 2-4h;
B, first stage are cooling: the temperature in stove is cooled to 660-680 ℃, insulation 2-4h with the speed of 20 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove to be cooled to 600-620 ℃ with the speed of 10 ℃/h;
D, phase III are cooling: fastening piece wire rod naturally cools to normal temperature.
Preferably, it in turn includes the following steps:
A, fastening piece wire rod is placed in to heat treatment furnace, in heat treated stove, is filled with shielding gas, then the temperature in stove is risen to 720 ℃, insulation 3h;
B, first stage are cooling: the temperature in stove is cooled to 670 ℃, insulation 3h with the speed of 20 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove to be cooled to 610 ℃ with the speed of 10 ℃/h;
D, phase III are cooling: fastening piece wire rod naturally cools to normal temperature.
Wherein, in described steps A, first in heat treated stove, be filled with purity and be 99.99% industrial nitrogen, when the temperature in stove is warming up to 500 ℃, close industrial nitrogen, in heat treated stove, be filled with dissociated methanol gas.
Wherein, after described step C finishes, close dissociated methanol gas, in heat treated stove, be filled with purity and be 99.99% industrial nitrogen.
Wherein, in described steps A, the temperature in stove is warming up to 710-730 ℃ with the speed of 90-120 ℃/h.
Wherein, cooling and described subordinate phase of described first stage is cooling is to be undertaken cooling by air-cooled mode.
Wherein, the material of described fastening piece wire rod is ultra low-carbon steel CH1T material for cold-heading.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
The carbide annealing process of a kind of soft fastening piece wire rod provided by the invention, first being warming up to 710-730 ℃ is incubated, because if holding temperature is too high, cementite will evenly be dissolved in austenite, thereby form single uniform austenite structure, theoretical according to nodularization, after uniform austenite is cooling, be transformed into nodular cementite tissue, be difficult to be transformed into spheroidite tissue, in like manner, when holding temperature is lower, cementite is not by fully molten disconnected, after transformation, be organized as block perlite, and skewness, also be difficult to obtain the spheroidizing pearlite of homogeneous microstructure.Then adopt the Slow cooling mode that the first stage is cooling, subordinate phase is cooling and the phase III is cooling, cementite nodularization rate is raise gradually, uniformity coefficient is also better, if speed of cooling is too fast, the spherodized structure obtaining is inhomogeneous; If speed of cooling is excessively slow, the sheet globular cementite in original structure is difficult to fragmentation, does not reach good nodularization effect.To sum up, it is better that the present invention adopts intensification, insulation, the first stage is cooling, subordinate phase is cooling and the phase III is cooling technique to reach Spheroidizing Annealing effect, fastening piece wire rod ductility is high, hardness is low, be applicable to follow-up plastic working moulding, the advantage that formed product cracking rate is low, this technical process is simultaneously simple, not high to equipment requirements, production efficiency is high, and cost is lower; After testing, treated fastening piece wire rod can reach following technical indicator: hardness (HV0.3): 90-100; Tensile strength: 280-310 MPa, grain fineness number: 10-12 level.
embodiment:
For the ease of those skilled in the art's understanding, below in conjunction with embodiment, the present invention is described in further detail, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
A carbide annealing process for soft fastening piece wire rod, it in turn includes the following steps:
A, the fastening piece wire rod that is CH1T by material are placed in heat treatment furnace, in heat treated stove, be filled with purity and be 99.99% industrial nitrogen, when the temperature in stove is warming up to 500 ℃ with the speed of 90 ℃/h, close technique nitrogen, in heat treated stove, be filled with dissociated methanol gas, continue to be warming up to 710 ℃, insulation 4h;
B, first stage are cooling: the temperature in stove is cooled to 680 ℃, insulation 2h by air-cooled mode with the speed of 20 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove with the speed of 10 ℃/h, to be cooled to 600 ℃ by air-cooled mode, close dissociated methanol gas, be filled with purity and be 99.99% industrial nitrogen in heat treated stove;
D, phase III are cooling: fastening piece wire rod naturally cools to normal temperature.
The fastening piece wire rod of processing through the present embodiment is carried out to Hardness Surveillance, and its Vickers' hardness is 90 after testing, and tensile strength is 280MPa, grain fineness number: 11 grades.。
By the fastening piece wire rod of processing through the present embodiment laterally under opticmicroscope (500 *) carry out metallurgical analysis, disperse granular (or spherical) carbide that distributing on discovery ferrite matrix, and disperse is even.
In a word, adopt fastening piece wire rod metallographic structure after processing method of the present invention is processed evenly, close grain, hardness is low, toughness is high, ductility is high, meets the fastener products requirement to highly difficult repeatedly plastic working moulding, formed product cracking rate is low.
Embodiment 2
A carbide annealing process for soft fastening piece wire rod, it in turn includes the following steps:
A, the fastening piece wire rod that is CH1T by material are placed in heat treatment furnace, in heat treated stove, be filled with the industrial nitrogen of purity 99.99%, while again the temperature in stove being warming up to 500 ℃ with the speed of 110 ℃/h, close technique nitrogen, in heat treated stove, be filled with dissociated methanol gas, continue to be warming up to 720 ℃, insulation 3h;
B, first stage are cooling: the temperature in stove is cooled to 670 ℃, insulation 3h by air-cooled mode with the speed of 20 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove with the speed of 10 ℃/h, to be cooled to 610 ℃ by air-cooled mode, close dissociated methanol gas, be filled with purity and be 99.99% industrial nitrogen in heat treated stove;
D, phase III are cooling: fastening piece wire rod naturally cools to normal temperature.
The fastening piece wire rod of processing through the present embodiment is carried out to Hardness Surveillance, and its Vickers' hardness is 94 after testing,, tensile strength is 291MPa, grain fineness number: 10 grades.。
By the fastening piece wire rod of processing through the present embodiment laterally under opticmicroscope (500 *) carry out metallurgical analysis, disperse granular (or spherical) carbide that distributing on discovery ferrite matrix, and disperse is even.
In a word, adopt fastening piece wire rod metallographic structure after processing method of the present invention is processed evenly, close grain, hardness is low, toughness is high, ductility is high, meets the fastener products requirement to highly difficult repeatedly plastic working moulding, formed product cracking rate is low.
Embodiment 3
A carbide annealing process for soft fastening piece wire rod, it in turn includes the following steps:
A, the fastening piece wire rod that is CH1T by material are placed in heat treatment furnace, in heat treated stove, be filled with the industrial nitrogen of purity 99.99%, when the temperature in stove is warming up to 500 ℃ with the speed of 120 ℃/h, close technique nitrogen, in heat treated stove, be filled with dissociated methanol gas, continue to be warming up to 730 ℃, insulation 2h;
B, first stage are cooling: the temperature in stove is cooled to 660 ℃, insulation 4h by air-cooled mode with the speed of 20 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove with the speed of 10 ℃/h, to be cooled to 620 ℃ by air-cooled mode, close dissociated methanol gas, be filled with purity and be 99.99% industrial nitrogen in heat treated stove;
D, phase III are cooling: fastening piece wire rod naturally cools to normal temperature.
The fastening piece wire rod of processing through the present embodiment is carried out to Hardness Surveillance, and its Vickers' hardness is 100 after testing, and tensile strength is 310MPa, grain fineness number: 12 grades.。
By the fastening piece wire rod of processing through the present embodiment laterally under opticmicroscope (500 *) carry out metallurgical analysis, disperse granular (or spherical) carbide that distributing on discovery ferrite matrix, and disperse is even.
In a word, adopt fastening piece wire rod fastener line material metallographic structure after processing method of the present invention is processed evenly, close grain, hardness is low, toughness is high, ductility is high, meet the fastener products requirement to highly difficult repeatedly plastic working moulding, formed product cracking rate is low.
Above-described embodiment is preferably embodiment of the present invention, but embodiments of the present invention are not restricted to the described embodiments, and the equivalent variations of therefore doing according to the present patent application the scope of the claims, within being included in protection scope of the present invention.
Claims (7)
1. a carbide annealing process for soft fastening piece wire rod, is characterized in that: it in turn includes the following steps:
A, fastening piece wire rod is placed in to heat treatment furnace, in heat treated stove, is filled with shielding gas, then the temperature in stove is risen to 710-730 ℃, insulation 2-4h;
B, first stage are cooling: the temperature in stove is cooled to 660-680 ℃, insulation 2-4h with the speed of 20 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove to be cooled to 600-620 ℃ with the speed of 10 ℃/h;
D, phase III are cooling: wire rod naturally cools to normal temperature.
2. the carbide annealing process of a kind of soft fastening piece wire rod according to claim 1, is characterized in that: it in turn includes the following steps::
A, fastening piece wire rod is placed in to heat treatment furnace, in heat treated stove, is filled with shielding gas, the temperature in stove is risen to 720 ℃, insulation 3h;
B, first stage are cooling: the temperature in stove is cooled to 670 ℃, insulation 3h with the speed of 20 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove to be cooled to 610 ℃ with the speed of 10 ℃/h;
D, phase III are cooling: fastening piece wire rod naturally cools to normal temperature.
3. the carbide annealing process of a kind of soft fastening piece wire rod according to claim 1 and 2, it is characterized in that: in described steps A, first in heat treated stove, be filled with purity and be 99.99% industrial nitrogen, when the temperature in stove is warming up to 500 ℃, close industrial nitrogen, in heat treated stove, be filled with dissociated methanol gas.
4. the carbide annealing process of a kind of soft fastening piece wire rod according to claim 1 and 2, is characterized in that: after described step C finishes, close dissociated methanol gas, be filled with purity and be 99.99% industrial nitrogen in heat treated stove.
5. the carbide annealing process of a kind of soft fastening piece wire rod according to claim 1, is characterized in that: in described steps A, the temperature in stove is warming up to 710-730 ℃ with the speed of 90-120 ℃/h.
6. the carbide annealing process of a kind of soft fastening piece wire rod according to claim 1, is characterized in that: cooling and described subordinate phase of described first stage is cooling is to be undertaken cooling by air-cooled mode.
7. the carbide annealing process of a kind of soft fastening piece wire rod according to claim 1, is characterized in that: the material of described fastening piece wire rod is ultra low-carbon steel CH1T material for cold-heading.
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| CN201410157040.7A CN103993140A (en) | 2014-04-19 | 2014-04-19 | Spheroidizing annealing technology of low-hardness fastener wires |
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| CN201410157040.7A CN103993140A (en) | 2014-04-19 | 2014-04-19 | Spheroidizing annealing technology of low-hardness fastener wires |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451048A (en) * | 2014-10-23 | 2015-03-25 | 杭州嘉诺德金属冷拉有限公司 | Anti-cracking boron steel isothermal spheroidizing annealing method |
| CN104551561A (en) * | 2014-12-11 | 2015-04-29 | 海盐三马标准件有限公司 | Nut processing technology |
| CN106755852A (en) * | 2016-11-30 | 2017-05-31 | 中国船舶重工集团公司第十二研究所 | A kind of steel alloy soft softening method |
| CN108796181A (en) * | 2018-06-28 | 2018-11-13 | 浙江俊荣五金工业有限公司 | One discharge plate member is heat-treated annealing process |
| CN109371226A (en) * | 2018-09-25 | 2019-02-22 | 杭州弹簧垫圈有限公司 | A kind of annealing regulation method of the spring washer of automation control |
| CN109609738A (en) * | 2018-12-27 | 2019-04-12 | 东莞科力线材技术有限公司 | Mobile phone big homalocephalus precision screw wire rod and preparation method thereof |
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| JP2000273542A (en) * | 1999-03-19 | 2000-10-03 | Kawasaki Steel Corp | Direct spheroidizing annealing method of steel wire |
| 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 |
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| JP2000273542A (en) * | 1999-03-19 | 2000-10-03 | Kawasaki Steel Corp | Direct spheroidizing annealing method of steel wire |
| 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 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451048A (en) * | 2014-10-23 | 2015-03-25 | 杭州嘉诺德金属冷拉有限公司 | Anti-cracking boron steel isothermal spheroidizing annealing method |
| CN104551561A (en) * | 2014-12-11 | 2015-04-29 | 海盐三马标准件有限公司 | Nut processing technology |
| CN106755852A (en) * | 2016-11-30 | 2017-05-31 | 中国船舶重工集团公司第十二研究所 | A kind of steel alloy soft softening method |
| CN108796181A (en) * | 2018-06-28 | 2018-11-13 | 浙江俊荣五金工业有限公司 | One discharge plate member is heat-treated annealing process |
| CN109371226A (en) * | 2018-09-25 | 2019-02-22 | 杭州弹簧垫圈有限公司 | A kind of annealing regulation method of the spring washer of automation control |
| CN109609738A (en) * | 2018-12-27 | 2019-04-12 | 东莞科力线材技术有限公司 | Mobile phone big homalocephalus precision screw wire rod and preparation method thereof |
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Application publication date: 20140820 |