CN103993141A - Spheroidizing annealing process for high-toughness medium carbon steel wires - Google Patents
Spheroidizing annealing process for high-toughness medium carbon steel wires Download PDFInfo
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- CN103993141A CN103993141A CN201410162553.7A CN201410162553A CN103993141A CN 103993141 A CN103993141 A CN 103993141A CN 201410162553 A CN201410162553 A CN 201410162553A CN 103993141 A CN103993141 A CN 103993141A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000000137 annealing Methods 0.000 title claims abstract description 24
- 229910000954 Medium-carbon steel Inorganic materials 0.000 title abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 239000007789 gas Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 3
- 239000010959 steel Substances 0.000 claims abstract description 3
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- 238000006062 fragmentation reaction Methods 0.000 description 1
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- 239000010451 perlite Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229910001561 spheroidite Inorganic materials 0.000 description 1
- 238000005563 spheronization Methods 0.000 description 1
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Abstract
The invention discloses a spheroidizing annealing process for high-toughness medium carbon steel wires. The spheroidizing annealing process comprises the steps as follows: putting the steel wires into a heat treatment furnace, charging protective gases into the heat treatment furnace, raising the temperature in the furnace to 710-730 DEG C, and keeping the temperature for 3-5 hours; performing first-stage cooling: cooling the temperature in the furnace to 680-700 DEG C at a speed of 10 DEG C/hour, and keeping the temperature for 2-4 hours; performing second-stage cooling: continuously cooling the temperature in the furnace to 630-650 DEG C at the speed of 10 DEG C/hour; and performing third-stage cooling: naturally cooling the medium carbon steel wires to a normal temperature. The medium carbon steel wires, which are processed by the process provided by the invention, are uniform in metallographic structure, high in toughness, high in malleability, and low in hardness; and the medium carbon steel wires are suitable for subsequent difficult multi-step stamping and forming, and are low in flattening, bending, and 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 high tenacity bullet wire.
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, reduce the hardness of material, improve the plasticity of material, reduce the resistance to deformation of material, make material be easy to plastic working and be molded over bullet wire and will obtain ideal performance and tissue in producing, key is to select suitable carbide annealing process.
At present, medium carbon steel has been widely used in the production of cold-heading part and extrusion, particularly along with scientific technological advance, performance requriements to product is more and more higher, this medium carbon steel wire rod before will changes persuing shape need to have very strong resistance to deformability, namely need to have high tenacity, the patent No. is that 201210166325.8 Chinese invention patent discloses a kind of medium carbon steel spheronization process, medium carbon steel wire rod is drawn into work in-process after surface derusting coating, after put it in strong convection electricity formula heated protective atmosphere furnace, be heated to 700-720 ℃, insulation 6-8 hour, carry out Spheroidizing Annealing, its nodularization rate reaches more than 90%.This technique soaking time is longer, energy consumption is larger, simultaneously to its heat up, rate of temperature fall do not controlled, the final less stable to product performance, improperly easily causes the metallographic structure of medium carbon steel wire rod inhomogeneous if control, hardness is higher, poor toughness, large quantities of superplasticity bullet wires when cold-formed because poor toughness is difficult to moulding, easy loss mould, cause the superplasticity bullet wire of producing to be scrapped simultaneously, have a strong impact on quality and the lumber recovery of superplasticity bullet wire.
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 high tenacity bullet wire is provided, adopt that bullet wire metallographic structure after processing method of the present invention is processed is even, toughness is high, ductility is high, hardness is low, be applicable to follow-up highly difficult Multi-step forming machine-shaping, that product rushes is flat, cracking during bending rate is low.
Object of the present invention is achieved through the following technical solutions:
A carbide annealing process for high tenacity bullet wire, it in turn includes the following steps:
A, bullet wire 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 3-5h;
B, first stage are cooling: the temperature in stove is cooled to 680-700 ℃, insulation 2-4h with the speed of 10 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove to be cooled to 630-650 ℃ with the speed of 10 ℃/h;
D, phase III are cooling: bullet wire naturally cools to normal temperature.
Preferably, it in turn includes the following steps:
A, bullet wire 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 4h;
B, first stage are cooling: the temperature in stove is cooled to 690 ℃, insulation 3h with the speed of 10 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove to be cooled to 640 ℃ with the speed of 10 ℃/h;
D, phase III are cooling: bullet wire 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 bullet wire is 45#.
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 bullet wire 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, bullet wire 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 bullet wire can reach following technical indicator: hardness (HV0.3): 130-150; Tensile strength: 520-580MPa, nodulizing grade: 5-6 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 high tenacity bullet wire, it in turn includes the following steps:
A, by material, be that 45# bullet wire is 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 5h;
B, first stage are cooling: the temperature in stove is cooled to 700 ℃, insulation 2h by air-cooled mode with the speed of 10 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove with the speed of 10 ℃/h, to be cooled to 630 ℃ 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: bullet wire naturally cools to normal temperature.
The bullet wire of processing through the present embodiment is carried out to Hardness Surveillance, and its Vickers' hardness is 130 after testing, and tensile strength is 520MPa, nodulizing grade: 6 grades.
By the bullet wire 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 that bullet wire metallographic structure after processing method of the present invention is processed is even, toughness is high, ductility is high, hardness is low, is applicable to follow-up highly difficult Multi-step forming machine-shaping, that product rushes is flat, cracking during bending rate is low.
Embodiment 2
A carbide annealing process for high tenacity bullet wire, it in turn includes the following steps:
A, by material, be that 45# bullet wire is 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 4h;
B, first stage are cooling: the temperature in stove is cooled to 690 ℃, insulation 3h by air-cooled mode with the speed of 10 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove with the speed of 10 ℃/h, to be cooled to 640 ℃ 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: bullet wire naturally cools to normal temperature.
The bullet wire of processing through the present embodiment is carried out to Hardness Surveillance, and its Vickers' hardness is 142 after testing, and tensile strength is 556MPa, nodulizing grade: 5 grades.
By the bullet wire 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 that bullet wire metallographic structure after processing method of the present invention is processed is even, toughness is high, ductility is high, hardness is low, is applicable to follow-up highly difficult Multi-step forming machine-shaping, that product rushes is flat, cracking during bending rate is low.
Embodiment 3
A carbide annealing process for high tenacity bullet wire, it in turn includes the following steps:
A, by material, be that 45# bullet wire is 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 3h;
B, first stage are cooling: the temperature in stove is cooled to 680 ℃, insulation 4h by air-cooled mode with the speed of 10 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove with the speed of 10 ℃/h, to be cooled to 650 ℃ 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: bullet wire naturally cools to normal temperature.
The bullet wire of processing through the present embodiment is carried out to Hardness Surveillance, and its Vickers' hardness is 150 after testing, and tensile strength is 580MPa, nodulizing grade: 6 grades.
By the bullet wire 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 that bullet wire metallographic structure after processing method of the present invention is processed is even, toughness is high, ductility is high, hardness is low, is applicable to follow-up highly difficult Multi-step forming machine-shaping, that product rushes is flat, cracking during bending 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 high tenacity bullet wire, is characterized in that: it in turn includes the following steps:
A, bullet wire 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 3-5h;
B, first stage are cooling: the temperature in stove is cooled to 680-700 ℃, insulation 2-4h with the speed of 10 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove to be cooled to 630-650 ℃ 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 high tenacity bullet wire according to claim 1, is characterized in that:
A, steel wire 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 4h;
B, first stage are cooling: the temperature in stove is cooled to 690 ℃, insulation 3h with the speed of 10 ℃/h;
C, subordinate phase are cooling: continue the temperature in stove to be cooled to 640 ℃ with the speed of 10 ℃/h;
D, phase III are cooling: bullet wire naturally cools to normal temperature.
3. the carbide annealing process of a kind of high tenacity bullet wire 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 high tenacity bullet wire according to claim 3, 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 high tenacity bullet wire 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 high tenacity bullet wire 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 high tenacity bullet wire according to claim 1, is characterized in that: the material of described bullet wire is 45#.
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| WO2018107473A1 (en) * | 2016-12-16 | 2018-06-21 | 蔡赛 | Annealing and heat treatment method for steel wire |
| 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 |
| CN109735692A (en) * | 2019-03-06 | 2019-05-10 | 浙江亚磊型钢冷拔有限公司 | A kind of steel staged annealing process |
| CN113151654A (en) * | 2021-04-26 | 2021-07-23 | 东南大学 | Processing method of medium carbon alloy steel |
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| JPH10204539A (en) * | 1997-01-14 | 1998-08-04 | Sumitomo Metal Ind Ltd | Production of cold rolled high-carbon steel strip |
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Application publication date: 20140820 |