CN102876859B - Spheroidizing annealing process of screw wire rod - Google Patents

Spheroidizing annealing process of screw wire rod Download PDF

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Publication number
CN102876859B
CN102876859B CN 201210426658 CN201210426658A CN102876859B CN 102876859 B CN102876859 B CN 102876859B CN 201210426658 CN201210426658 CN 201210426658 CN 201210426658 A CN201210426658 A CN 201210426658A CN 102876859 B CN102876859 B CN 102876859B
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China
Prior art keywords
wire rod
cooling
screw wire
stove
temperature
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CN 201210426658
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Chinese (zh)
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CN102876859A (en
Inventor
王斯华
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东莞市科力钢铁线材有限公司
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Abstract

The invention relates to an annealing process of a metal material, in particular to a spheroidizing annealing process of a screw wire rod. The spheroidizing annealing process comprises the following steps: placing the screw wire rod into a heat treatment furnace, filing insert gas into the heat treatment furnace, heating the temperature in the furnace to 710-730 DEG C, and thermally insulating for 5-8 hours; cooling at the first stage, that is to say, cooling the temperature in the furnace to 540-560 DEG C at the speed of 20 DEG C per hour; cooling at the first stage, that is to say, cooling the temperature in the furnace to 390-410 DEG C at the speed of 80 DEG C per hour; and cooling in the third stage, that is to say, discharging the screw wire rod and naturally cooling to normal temperature. The screw wire rod treated by the process method provided in the invention has the advantages of high ductility and low hardness, and is suitable for sequential plastic processing molding, and a product has low molding cracking rate.

Description

A kind of carbide annealing process of screw wire rod

Technical field

The present invention relates to the annealing process of metallic substance, be specifically related to a kind of carbide annealing process of screw 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 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 and be shaped.Will obtain ideal performance and tissue in the screw wire production, key is to select suitable carbide annealing process.

The Chinese invention patent that publication number is CN1245524C has been introduced a kind of spheroidal annealing, workpiece is put into to annealing furnace, control acid extraction, carry out annealing process, it is characterized in that in annealing process taking following method and step: a, adopt mechanical pump to extract fast the annealing furnace air, while in stove, forming the vacuum tightness of 10-50pa, 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 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.

At present, aborning, during the screw wire rod of smelting low carbon steel alloy, after according to existing technique, the screw wire rod being carried out to Slow cooling or annealing, hardness is higher, and crackle appears in large quantities of screw wire rods, and the lighter need utilize the crack site excision, severe one directly causes the screw wire rod of producing to be scrapped, and has a strong impact on quality and the lumber recovery of screw wire rod.

Summary of the invention

The objective of the invention is to overcome the deficiency that prior art exists, a kind of carbide annealing process of screw wire rod is provided, adopt that screw wire rod ductility after processing method of the present invention is processed is high, hardness is low, is applicable to follow-up plastic working and is shaped, the product shaping cracking rate is low.

Purpose of the present invention is achieved through the following technical solutions:

A kind of carbide annealing process of screw wire rod, it in turn includes the following steps:

A, the screw wire rod is placed in to heat treatment furnace, the screw wire rod is placed in to heat treatment furnace, be filled with rare gas element in the heat treated stove, then the temperature in stove is risen to 710-730 ℃, insulation 5-8h;

B, first stage are cooling: the temperature in stove is cooled to 540-560 ℃ with the speed of 20 ℃/hs;

C, subordinate phase are cooling: continue the temperature in stove is cooled to 390-410 ℃ with the speed of 80 ℃/hs

D, phase III are cooling: the screw wire rod is come out of the stove and is naturally cooled to normal temperature.

Preferably, it in turn includes the following steps:

A, the screw wire rod is placed in to heat treatment furnace, is filled with rare gas element in the heat treated stove, then the temperature in stove is risen to 720 ℃, insulation 6h;

B, first stage are cooling: the temperature in stove is cooled to 550 ℃ with the speed of 20 ℃/hs;

C, subordinate phase are cooling: continue the temperature in stove is cooled to 400 ℃ with the speed of 80 ℃/hs

D, phase III are cooling: the screw wire rod is come out of the stove and is naturally cooled to normal temperature.

Wherein, the industrial nitrogen that the rare gas element that described steps A is filled with is purity 99.9%.

Wherein, in described steps A, the temperature in stove is warming up to 710-730 ℃ with the speed of 100-145 ℃/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 screw wire rod is low-carbon alloy steel 10B21.

The present invention compared with prior art, has following advantage and beneficial effect:

The carbide annealing process of a kind of screw wire rod provided by the invention, at first being warming up to 710-730 ℃ is incubated, because if holding temperature is too high, cementite will evenly be dissolved in austenite, thereby forms single uniform austenite structure, according to the nodularization theory, austenite is difficult to be transformed into the spheroidite tissue uniformly, in like manner, and when holding temperature is low, cementite, by fully molten disconnected, is not difficult to obtain spherodized structure yet.Then adopt the Slow cooling mode that the first stage is cooling, subordinate phase is cooling and the phase III is cooling, make cementite nodularization rate raise gradually, uniformity coefficient is also better, if speed of cooling is too fast, the spherodized structure obtained 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 the Spheroidizing Annealing effect, screw wire rod ductility is high, hardness is low, being applicable to follow-up plastic working is shaped, the advantage that the product shaping cracking rate is low, this technical process simultaneously is simple, not high to equipment requirements, production efficiency is high, and cost is lower.

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 kind of carbide annealing process of screw wire rod, it in turn includes the following steps:

A, the screw wire rod that is low-carbon alloy steel 10B21 by material are placed in heat treatment furnace, the screw wire rod is placed in to heat treatment furnace, be filled with the industrial nitrogen that purity is 99.9% in the heat treated stove, the temperature in stove is warming up to 710 ℃ with the speed of 100 ℃/hs, insulation 5h;

B, first stage are cooling: the temperature in stove is cooled to 540 ℃ by air-cooled mode with the speed of 20 ℃/hs;

C, subordinate phase are cooling: continue the temperature in stove is cooled to 390 ℃ by air-cooled mode with the speed of 80 ℃/hs

D, phase III are cooling: the screw wire rod is come out of the stove and is naturally cooled to normal temperature.

The screw wire rod that to process through the present embodiment carries out the Rockwell hardness check, and its hardness is 117 after testing.

The screw wire rod that to process through the present embodiment laterally carries out metallurgical analysis under opticmicroscope, find on ferrite matrix disperse granular (or spherical) carbide that distributing, and disperse is even.

In a word, adopt that screw wire rod ductility after processing method of the present invention is processed is high, hardness is low, is applicable to follow-up plastic working and is shaped, the product shaping cracking rate is low.

Embodiment 2

A kind of carbide annealing process of screw wire rod, it in turn includes the following steps:

A, the screw wire rod that is low-carbon alloy steel 10B21 by material are placed in heat treatment furnace, the screw wire rod is placed in to heat treatment furnace, be filled with the industrial nitrogen of purity 99.9% in the heat treated stove, then the temperature in stove is warming up to 720 ℃ with the speed of 130 ℃/hs, insulation 6h;

B, first stage are cooling: the temperature in stove is cooled to 550 ℃ by air-cooled mode with the speed of 20 ℃/hs;

C, subordinate phase are cooling: continue the temperature in stove is cooled to 400 ℃ by air-cooled mode with the speed of 80 ℃/hs

D, phase III are cooling: the screw wire rod is come out of the stove and is naturally cooled to normal temperature.

The screw wire rod that to process through the present embodiment carries out the Rockwell hardness check, and its hardness is 116 after testing.

The screw wire rod that to process through the present embodiment laterally under opticmicroscope (500 *) carry out metallurgical analysis, find on ferrite matrix disperse granular (or spherical) carbide that distributing, and disperse is even.

In a word, adopt that screw wire rod ductility after processing method of the present invention is processed is high, hardness is low, is applicable to follow-up plastic working and is shaped, the product shaping cracking rate is low.

Embodiment 3

A kind of carbide annealing process of screw wire rod, it in turn includes the following steps:

A, the screw wire rod that is low-carbon alloy steel 10B21 by material are placed in heat treatment furnace, the screw wire rod is placed in to heat treatment furnace, be filled with the industrial nitrogen of purity 99.9% in the heat treated stove, the temperature in stove is warming up to 730 ℃ with the speed of 145 ℃/hs, insulation 8h;

B, first stage are cooling: the temperature in stove is cooled to 560 ℃ by air-cooled mode with the speed of 20 ℃/hs;

C, subordinate phase are cooling: continue the temperature in stove is cooled to 410 ℃ by air-cooled mode with the speed of 80 ℃/hs

D, phase III are cooling: the screw wire rod is come out of the stove and is naturally cooled to normal temperature.

The screw wire rod that to process through the present embodiment carries out the Rockwell hardness check, and its hardness is 118 after testing.

The screw wire rod that to process through the present embodiment laterally under opticmicroscope (500 *) carry out metallurgical analysis, find on ferrite matrix disperse granular (or spherical) carbide that distributing, and disperse is even.

In a word, adopt that screw wire rod ductility after processing method of the present invention is processed is high, hardness is low, is applicable to follow-up plastic working and is shaped, the product shaping 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 (5)

1. the carbide annealing process of a screw wire rod, it is characterized in that: it in turn includes the following steps:
A, the screw wire rod is placed in to heat treatment furnace, is filled with rare gas element in the heat treated stove, then the temperature in stove is risen to 710-730 ℃, insulation 5-8h;
B, first stage are cooling: the temperature in stove is cooled to 540-560 ℃ with the speed of 20 ℃/hs;
C, subordinate phase are cooling: continue the temperature in stove is cooled to 390-410 ℃ with the speed of 80 ℃/hs;
D, phase III are cooling: the screw wire rod is come out of the stove and is naturally cooled to normal temperature,
Wherein, the material of described screw wire rod is low-carbon alloy steel 10B21.
2. the carbide annealing process of a kind of screw wire rod according to claim 1, it is characterized in that: it in turn includes the following steps:
A, the screw wire rod is placed in to heat treatment furnace, is filled with rare gas element in the heat treated stove, then the temperature in stove is risen to 720 ℃, insulation 6h;
B, first stage are cooling: the temperature in stove is cooled to 550 ℃ with the speed of 20 ℃/hs;
C, subordinate phase are cooling: continue the temperature in stove is cooled to 400 ℃ with the speed of 80 ℃/hs;
D, phase III are cooling: the screw wire rod is come out of the stove and is naturally cooled to normal temperature.
3. the carbide annealing process of a kind of screw wire rod according to claim 1, is characterized in that: the industrial nitrogen that the rare gas element that described steps A is filled with is purity 99.9%.
4. the carbide annealing process of a kind of screw 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 100-145 ℃/h.
5. the carbide annealing process of a kind of screw wire rod according to claim 1, it is characterized in that: cooling and described subordinate phase of described first stage is cooling is to be undertaken cooling by air-cooled mode.
CN 201210426658 2012-10-31 2012-10-31 Spheroidizing annealing process of screw wire rod CN102876859B (en)

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN103993141A (en) * 2014-04-23 2014-08-20 东莞市科力钢铁线材有限公司 Spheroidizing annealing process for high-toughness medium carbon steel wires
CN104404208A (en) * 2014-09-26 2015-03-11 无锡市羊尖盛裕机械配件厂 Fastener annealing process
CN104307914A (en) * 2014-09-26 2015-01-28 无锡市羊尖盛裕机械配件厂 Screw wire manufacturing technology
CN104451048B (en) * 2014-10-23 2016-11-30 杭州嘉诺德金属冷拉有限公司 A kind of crack resistence boron steel isothermal spheroidizing method
CN107090539A (en) * 2017-06-23 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 A kind of bearing steel vacuum isothermal annealing process
CN108176954A (en) * 2017-12-15 2018-06-19 浙江天力机车部件有限公司 The forming technology of fastener
CN108384929A (en) * 2018-04-25 2018-08-10 黄骅聚金五金制品有限公司 A kind of annealing process of high-intensity fasteners bolt material
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

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Publication number Priority date Publication date Assignee Title
US4375378A (en) * 1979-12-07 1983-03-01 Nippon Steel Corporation Process for producing spheroidized wire rod
CN102433502A (en) * 2011-12-23 2012-05-02 中冶南方(武汉)威仕工业炉有限公司 Spheroidized annealing technology for GCr15 bearing steel

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JP4646866B2 (en) * 2006-01-24 2011-03-09 株式会社神戸製鋼所 Bearing steel wire excellent in drawing and method for producing the same

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Publication number Priority date Publication date Assignee Title
US4375378A (en) * 1979-12-07 1983-03-01 Nippon Steel Corporation Process for producing spheroidized wire rod
CN102433502A (en) * 2011-12-23 2012-05-02 中冶南方(武汉)威仕工业炉有限公司 Spheroidized annealing technology for GCr15 bearing steel

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Address after: 523000 Guangdong province Dongguan city Wangniudun Industrial Park in Dongxing

Patentee after: Dongguan Keli Wire Technology Co. Ltd.

Address before: 523196 Guangdong province Dongguan city Wangniudun Industrial Park Dongxing Dongguan Keli steel wire Co. Ltd.

Patentee before: Dongguan Kelee Steel Wire Co., Ltd.