CN104232858A - Spheroidizing annealing technology of high-tenacity fastener wire rod - Google Patents
Spheroidizing annealing technology of high-tenacity fastener wire rod Download PDFInfo
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- CN104232858A CN104232858A CN201410429755.3A CN201410429755A CN104232858A CN 104232858 A CN104232858 A CN 104232858A CN 201410429755 A CN201410429755 A CN 201410429755A CN 104232858 A CN104232858 A CN 104232858A
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Abstract
The invention discloses a spheroidizing annealing technology of a high-tenacity fastener wire rod. The spheroidizing annealing technology comprises the following steps: placing a fastener wire rod into a thermal treatment furnace, introducing a protective gas into the thermal treatment furnace, raising the temperature in the furnace to 720-740DEG C, and performing heat preservation for 1-3h; carrying out first-stage cooling: cooling the temperature in the furnace to 680-700DEG C at the speed of 10DEG C/h, and performing heat preservation for 2-4h; carrying out second-stage cooling: further reducing the temperature in the furnace to 630-650DEG C at the speed of 20DEG C/h; and carrying out third-stage cooling: naturally cooling the fastener wire rod to normal temperature. The fastener wire rod treated by adopting the technological method is uniform in metallographic structure, high in tenacity, high in ductility, low in hardness and suitable for subsequent high-difficulty repeated plastic machining forming, and the forming cracking rate of the product is low.
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 high tenacity fastener wire.
Background technology:
Spheroidizing Annealing is one of Basic Ways improving structure of steel and performance, the main purpose of Spheroidizing Annealing is the carbide spheroidization made in the microtexture of ferrous materials, reduces the hardness of material, improves the plasticity of material, reduce the resistance to deformation of material, make material be easy to plastic working shaping.Fastening piece for two or more parts (or component) are fastenedly connected become one overall time the general name of class mechanical component that adopts, will obtain ideal performance and tissue in fastener wire is produced, key selects suitable carbide annealing process.
At present, in the industrial production spheroidized carbide tissue is obtained to fastener material many employings intercritical annealing treatment process, this technique is that the advantageous effect of the non-self method forming core utilizing undissolved carbide or austenite middle and high concentration carbon segregation district in inhomogenous austenite is to accelerate nodularization, but in fact when temperature carbide i.e. all dissolvings within 0.5h more than A1 temperature, if perlite very this dissolving of detailed rules and regulations can be more rapid, therefore, if be heated to more than A1 temperature according to existing technique, slow cooling is to below A1 subsequently, then this nodular troostite is organized, often substitute by the thick pearlitic structure that formed in slow cooling or insulating process, its result is unfavorable for the nodularization of carbide on the contrary, be difficult to obtain ideal pearlitic spheroidization tissue, when production fastener wire, metallographic structure is uneven, hardness is higher, poor toughness, crackle is there is in large quantities of fastener wire after cold-formed, crack site excision need utilize by the lighter, severe one directly causes the fastener wire of producing to be scrapped, have a strong impact on quality and the lumber recovery of fastener wire.
Summary of the invention:
The object of the invention is the deficiency overcoming prior art existence, the mode of the insulation of operational phase formula and Slow cooling carries out Spheroidizing Annealing to fastener wire, adopt that the fastener wire metallographic structure after processing method process of the present invention is even, toughness is high, ductility is high, hardness is low, be applicable to follow-up highly difficult repeatedly plastic working shaping, formed product cracking rate is low.
Object of the present invention is achieved through the following technical solutions:
A carbide annealing process for high tenacity fastener wire, it in turn includes the following steps:
A, fastener wire is placed in heat treatment furnace, is filled with shielding gas in heat treated stove, then the temperature in stove is risen to 720-740 DEG C, insulation 1-3h;
B, first stage cooling: the temperature in stove is cooled to 680-700 DEG C with the speed of 10 DEG C/h, insulation 2-4h;
C, subordinate phase cool: continue the temperature in stove to be cooled to 630-650 DEG C with the speed of 20 DEG C/h;
D, phase III cooling: fastener wire naturally cools to normal temperature.
Preferably, it in turn includes the following steps:
A, fastener wire is placed in heat treatment furnace, is filled with shielding gas in heat treated stove, then the temperature in stove is risen to 730 DEG C, insulation 2h;
B, first stage cooling: the temperature in stove is cooled to 690 DEG C with the speed of 10 DEG C/h, insulation 3h;
C, subordinate phase cool: continue the temperature in stove to be cooled to 640 DEG C with the speed of 20 DEG C/h;
D, phase III cooling: fastener wire naturally cools to normal temperature.
Wherein, in described steps A, be first filled with the industrial nitrogen that purity is 99.99% in heat treated stove, when the temperature to 500 in stove DEG C, close industrial nitrogen, in heat treated stove, be filled with dissociated methanol gas.
Wherein, after described step C terminates, close dissociated methanol gas, in heat treated stove, be filled with the industrial nitrogen that purity is 99.99%.
Wherein, in described steps A, the temperature in stove is warming up to 720-740 DEG C with the speed of 90-120 DEG C/h.
Wherein, described first stage cooling and the cooling of described subordinate phase are cooled by air-cooled mode.
Wherein, the material of described fastener wire is cold-heading carbon steel SWRCH18A.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
The carbide annealing process of a kind of high tenacity fastener wire provided by the invention, first be warming up to 720-740 DEG C to be incubated, because if holding temperature is too high, cementite will evenly be dissolved in austenite, thus form single uniform austenite structure, theoretical according to nodularization, nodular cementite tissue is transformed into after uniform austenite cooling, be difficult to be transformed into spheroidite tissue, in like manner, when holding temperature is lower, cementite is not by abundant molten disconnected, block perlite is organized as after transformation, and skewness, also the spheroidizing pearlite obtaining homogeneous microstructure is difficult to.Then adopt the Slow cooling mode that first stage cooling, subordinate phase cooling and phase III cool, cementite Oxygen potential is raised gradually, and uniformity coefficient is also better, if speed of cooling is too fast, the spherodized structure obtained is uneven; 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 technique that the present invention adopts intensification, insulation, first stage cooling, subordinate phase cooling and phase III to cool reaches Spheroidizing Annealing effect, fastener wire ductility is high, hardness is low, be applicable to follow-up plastic working shaping, 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 fastener wire can reach following technical indicator: hardness (HV0.3): 110-130; Tensile strength: 380-420 MPa; Nodulizing grade: 5-6 level.
embodiment:
For the ease of the understanding of those skilled in the art, 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 high tenacity fastener wire, it in turn includes the following steps:
A, be that the fastener wire of SWRCH18A is placed in heat treatment furnace by material, the industrial nitrogen that purity is 99.99% is filled with in heat treated stove, when temperature in stove is warming up to 500 DEG C with the speed of 90 DEG C/h, close technique nitrogen, dissociated methanol gas is filled with in heat treated stove, continue to be warming up to 720 DEG C, insulation 3h;
B, first stage cooling: the temperature in stove is cooled to 700 DEG C by air-cooled mode with the speed of 10 DEG C/h, insulation 2h;
C, subordinate phase cool: continue the temperature in stove to be cooled to 630 DEG C by air-cooled mode with the speed of 20 DEG C/h, close dissociated methanol gas, are filled with the industrial nitrogen that purity is 99.99% in heat treated stove;
D, phase III cooling: fastener wire naturally cools to normal temperature.
Fastener wire through the present embodiment process is carried out Hardness Surveillance, and its Vickers' hardness is 110 after testing, and tensile strength is 380MPa, Oxygen potential 6 grades.
Fastener wire horizontal (500 ×) under an optical microscope through the present embodiment process is carried out metallurgical analysis, find that on ferrite matrix, Dispersed precipitate granular (or spherical) carbide, and disperse is even.
In a word, adopt that the fastener wire metallographic structure after processing method process of the present invention is even, toughness is high, ductility is high, hardness is low, be applicable to follow-up highly difficult repeatedly plastic working shaping, formed product cracking rate is low.
Embodiment 2
A carbide annealing process for high tenacity fastener wire, it in turn includes the following steps:
A, be that the fastener wire of SWRCH18A is placed in heat treatment furnace by material, the industrial nitrogen of purity 99.99% is filled with in heat treated stove, when again the temperature in stove being warming up to 500 DEG C with the speed of 110 DEG C/h, close technique nitrogen, dissociated methanol gas is filled with in heat treated stove, continue to be warming up to 730 DEG C, insulation 2h;
B, first stage cooling: the temperature in stove is cooled to 690 DEG C by air-cooled mode with the speed of 10 DEG C/h, insulation 3h;
C, subordinate phase cool: continue the temperature in stove to be cooled to 640 DEG C by air-cooled mode with the speed of 20 DEG C/h, close dissociated methanol gas, are filled with the industrial nitrogen that purity is 99.99% in heat treated stove;
D, phase III cooling: fastener wire naturally cools to normal temperature.
Fastener wire through the present embodiment process is carried out Hardness Surveillance, and its Vickers' hardness is 118 after testing, tensile strength is 395MPa, Oxygen potential 5 grades.
Fastener wire horizontal (500 ×) under an optical microscope through the present embodiment process is carried out metallurgical analysis, find that on ferrite matrix, Dispersed precipitate granular (or spherical) carbide, and disperse is even.
In a word, adopt that the fastener wire metallographic structure after processing method process of the present invention is even, toughness is high, ductility is high, hardness is low, be applicable to follow-up highly difficult repeatedly plastic working shaping, formed product cracking rate is low.
Embodiment 3
A carbide annealing process for high tenacity fastener wire, it in turn includes the following steps:
A, be that the fastener wire of SWRCH18A is placed in heat treatment furnace by material, the industrial nitrogen of purity 99.99% is filled with in heat treated stove, when temperature in stove is warming up to 500 DEG C with the speed of 120 DEG C/h, close technique nitrogen, dissociated methanol gas is filled with in heat treated stove, continue to be warming up to 740 DEG C, insulation 1h;
B, first stage cooling: the temperature in stove is cooled to 680 DEG C by air-cooled mode with the speed of 10 DEG C/h, insulation 4h;
C, subordinate phase cool: continue the temperature in stove to be cooled to 650 DEG C by air-cooled mode with the speed of 20 DEG C/h, close dissociated methanol gas, are filled with the industrial nitrogen that purity is 99.99% in heat treated stove;
D, phase III cooling: fastener wire naturally cools to normal temperature.
Fastener wire through the present embodiment process is carried out Hardness Surveillance, and its Vickers' hardness is 130 after testing, and tensile strength is 420MPa, Oxygen potential 6 grades.
Fastener wire horizontal (500 ×) under an optical microscope through the present embodiment process is carried out metallurgical analysis, find that on ferrite matrix, Dispersed precipitate granular (or spherical) carbide, and disperse is even.
In a word, adopt that the fastener wire fastener wire metallographic structure after processing method process of the present invention is even, toughness is high, ductility is high, hardness is low, be applicable to follow-up highly difficult repeatedly plastic working shaping, formed product cracking rate is low.
Above-described embodiment is the present invention's preferably embodiment, but embodiments of the present invention are not restricted to the described embodiments, and therefore according to the equivalent variations that the present patent application the scope of the claims is done, is included within protection scope of the present invention.
Claims (7)
1. a carbide annealing process for high tenacity fastener wire, is characterized in that: it in turn includes the following steps:
A, fastener wire is placed in heat treatment furnace, is filled with shielding gas in heat treated stove, then the temperature in stove is risen to 720-740 DEG C, insulation 1-3h;
B, first stage cooling: the temperature in stove is cooled to 680-700 DEG C with the speed of 10 DEG C/h, insulation 2-4h;
C, subordinate phase cool: continue the temperature in stove to be cooled to 630-650 DEG C with the speed of 20 DEG C/h;
D, phase III cooling: wire rod naturally cools to normal temperature.
2. the carbide annealing process of a kind of high tenacity fastener wire according to claim 1, is characterized in that:
A, fastener wire is placed in heat treatment furnace, is filled with shielding gas in heat treated stove, the temperature in stove is risen to 730 DEG C, insulation 2h;
B, first stage cooling: the temperature in stove is cooled to 690 DEG C with the speed of 10 DEG C/h, insulation 3h;
C, subordinate phase cool: continue the temperature in stove to be cooled to 640 DEG C with the speed of 20 DEG C/h;
D, phase III cooling: fastener wire naturally cools to normal temperature.
3. the carbide annealing process of a kind of high tenacity fastener wire according to claim 1 and 2, it is characterized in that: in described steps A, first the industrial nitrogen that purity is 99.99% is filled with in heat treated stove, when the temperature to 500 in stove DEG C, close industrial nitrogen, in heat treated stove, be filled with dissociated methanol gas.
4. the carbide annealing process of a kind of high tenacity fastener wire according to claim 3, is characterized in that: after described step C terminates, and closes dissociated methanol gas, is filled with the industrial nitrogen that purity is 99.99% in heat treated stove.
5. the carbide annealing process of a kind of high tenacity fastener wire according to claim 1, is characterized in that: in described steps A, the temperature in stove is warming up to 720-740 DEG C with the speed of 90-120 DEG C/h.
6. the carbide annealing process of a kind of high tenacity fastener wire according to claim 1, is characterized in that: described first stage cooling and the cooling of described subordinate phase are cooled by air-cooled mode.
7. the carbide annealing process of a kind of high tenacity fastener wire according to claim 1, is characterized in that: the material of described fastener wire is cold-heading carbon steel SWRCH18A.
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| CN201410429755.3A CN104232858A (en) | 2014-04-23 | 2014-08-28 | Spheroidizing annealing technology of high-tenacity fastener wire rod |
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| CN201410162555.6 | 2014-04-23 | ||
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| CN201410429755.3A CN104232858A (en) | 2014-04-23 | 2014-08-28 | Spheroidizing annealing technology of high-tenacity fastener wire rod |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184425A (en) * | 2019-06-24 | 2019-08-30 | 浙江日星标准件有限公司 | A kind of high-intensity fasteners isothermal spheroidizing cold-heading molding method |
| CN111876564A (en) * | 2020-07-14 | 2020-11-03 | 昆山正通铭金属有限公司 | Spheroidizing annealing process of hexagonal alloy tool steel S2 |
| CN112280942A (en) * | 2020-09-01 | 2021-01-29 | 山西太钢不锈钢股份有限公司 | Martensitic stainless steel 2Cr13 wire annealing process |
| CN114231703A (en) * | 2021-11-09 | 2022-03-25 | 马鞍山钢铁股份有限公司 | High-strength simplified annealing cold forging steel production method |
-
2014
- 2014-08-28 CN CN201410429755.3A patent/CN104232858A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184425A (en) * | 2019-06-24 | 2019-08-30 | 浙江日星标准件有限公司 | A kind of high-intensity fasteners isothermal spheroidizing cold-heading molding method |
| CN110184425B (en) * | 2019-06-24 | 2021-01-15 | 浙江日星标准件有限公司 | High-strength fastener isothermal spheroidizing annealing cold heading forming method |
| CN111876564A (en) * | 2020-07-14 | 2020-11-03 | 昆山正通铭金属有限公司 | Spheroidizing annealing process of hexagonal alloy tool steel S2 |
| CN111876564B (en) * | 2020-07-14 | 2022-03-04 | 昆山正通铭金属有限公司 | Spheroidizing annealing process of hexagonal alloy tool steel S2 |
| CN112280942A (en) * | 2020-09-01 | 2021-01-29 | 山西太钢不锈钢股份有限公司 | Martensitic stainless steel 2Cr13 wire annealing process |
| CN114231703A (en) * | 2021-11-09 | 2022-03-25 | 马鞍山钢铁股份有限公司 | High-strength simplified annealing cold forging steel production method |
| CN114231703B (en) * | 2021-11-09 | 2023-07-25 | 马鞍山钢铁股份有限公司 | Production method of high-strength simplified annealed cold heading steel |
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Application publication date: 20141224 |