CN104313281A - Process for producing high-nodularity fastener wire rod - Google Patents
Process for producing high-nodularity fastener wire rod Download PDFInfo
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- CN104313281A CN104313281A CN201410516909.2A CN201410516909A CN104313281A CN 104313281 A CN104313281 A CN 104313281A CN 201410516909 A CN201410516909 A CN 201410516909A CN 104313281 A CN104313281 A CN 104313281A
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Abstract
The invention discloses a process for producing a high-nodularity fastener wire rod. The process comprises the following steps: (1) selecting materials, namely selecting a steel wire with the model of SWRCH22A; (2) drawing, namely drawing the steel wire by adopting a drawing machine, wherein the compression rate is more than or equal to 50 percent; (3) performing spheroidizing annealing, namely lifting the steel wire into an atmosphere protection furnace, adding a protective atmosphere into the atmosphere protection furnace, heating the steel wire to a temperature which is 20-30 DEG C higher than the austenite transformation temperature, preserving the heat for 4-6 hours, slowly cooling to a temperature which is 20-30 DEG C lower than the austenite transformation temperature at a rate of 10 DEG C per hour, preserving the heat for 3-4 hours, and performing furnace cooling until the product is discharged out of the furnace; and (4) performing precision drawing, namely drawing the steel wire again by adopting the drawing machine, wherein the compression rate is less than or equal to 10 percent. The treated steel wire has the grain size of more than or equal to 10 grades, the grains are uniform, the nodulizing grade is more than or equal to 5, the nodulizing rate is high, the pearlite is uniform in distribution, and the wire rod does not have abnormal tissues, has high plastic deformation capacity and is suitable for subsequent plastic forming, and the wire rod with excellent size and surface is obtained.
Description
Technical field
The present invention relates to annealing of metal materials technology field technology, refer in particular to a kind of production technique of high Oxygen potential fastener wire.
Background technology
The forging processing of the forging of automobile component mainly ferrous metal is wherein extensive with the use of low-carbon alloy steel and soft steel again.Conventional forging steel have 20CrMo, 10 steel, 20 steel, 20CrMnTi, 20Cr etc.There are the special steel for cold forging commercial exploitation in external iron and steel manufacturing concern, such as SWRCH8A, SWRCH18A, SWRCH22A of Japan, these steel all have good forging characteristic and heat treatment performance, and resistance to deformation is little, metallographic structure is even, surface quality is good.Particularly there is the dish circle steel alloy being specifically designed to high-speed horizontal multi-work-station cold header in external steel mill, buys this steel at home quite difficult, therefore also limit the application of high-speed horizontal multi-work-station cold header in automobile component are produced.Domestic rolling shapes also enriched in recent years gradually, but were not also specifically designed to the steel of cold forging.Meanwhile, annealed steel domestic market provided is all generally stress relief annealing state.For 20CrMo, hardness is at more than HB140.So be engaged in the producer of cold forging, after have purchased material, all have to cold-drawn cylindrical or car, cylindrical grinding voluntarily, carry out modified to material, then carry out Full Annealing or Spheroidizing Annealing.Even if like this, because each manufacturer annealing process is uneven, its technique is unreasonable, cause the uniformity coefficient of material composition bad, still have and suddenly softly neglect hard phenomenon, often poor dimensional stability in forging process, even cause the early failure of mould, thus improve the cost of forging.
Summary of the invention
In view of this, the present invention is directed to the disappearance of prior art existence, its main purpose is to provide a kind of production technique of high Oxygen potential fastener wire, and it can effectively solve, and existing annealing process is unreasonable to cause in forging process often poor dimensional stability and forge the high problem of cost.
For achieving the above object, the present invention adopts following technical scheme:
A production technique for high Oxygen potential fastener wire, includes following steps:
(1) selection: select model to be the steel wire of SWRCH22A;
(2) drawing: adopt cold drawing bench to carry out drawing to steel wire, rate of compression >=50%;
(3) Spheroidizing Annealing: steel wire is hung in atmosphere protection stove, protective atmosphere is added with in atmosphere protection stove, then steel wire is warmed up to more than austenite transformation temperature 20 ~ 30 DEG C, be incubated 4 ~ 6 hours, and then progressively cool to below austenite transformation temperature 20 ~ 30 DEG C with 10 DEG C/h, be incubated 3 ~ 4 hours, then cool to the furnace and come out of the stove, austenite transformation temperature is 720 DEG C;
(4) precision drawing: adopt cold drawing bench to carry out drawing again to steel wire, rate of compression≤10%.
As a kind of preferred version, described protective atmosphere is methyl alcohol, and methanol stream amount is 10ml/min.
The present invention compared with prior art has obvious advantage and beneficial effect, specifically, as shown from the above technical solution:
Its grain fineness number >=10 grade of steel wire after treatment, uniform crystal particles, nodulizing grade >=5 grade, Oxygen potential is high, and perlite is evenly distributed, tissue without exception, possesses plastic deformation ability strong, be applicable to follow-up plastic working to be shaped, guarantee to obtain size, surperficial superior product, guarantee that subsequent heat treatment meets its finished product and uses standard-required simultaneously.As can be seen from above index, its properties is obviously superior to existing market analogous products, can better apply, and improve use properties and the life-span of product, have good market outlook, the company of can be creates considerable economic benefit.
For more clearly setting forth constitutional features of the present invention and effect, below in conjunction with accompanying drawing and specific embodiment, the present invention is described in detail.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the preferred embodiment of the present invention.
Embodiment
Please refer to shown in Fig. 1, the present invention discloses a kind of production technique of high Oxygen potential fastener wire, includes following steps:
(1) selection: select model to be the steel wire of SWRCH22A, especially S, P content is strictly controlled when receiving inspection, to Segregation of Chemical Composition, the stability aspect of interior tissue situation, original size precision and various performance inconsistency more strictly controls, to meet the needs of annealed structure.
(2) drawing: adopt cold drawing bench to carry out drawing to steel wire, rate of compression >=50%, rate of compression is large, and its deflection produced is larger, the inside ferrite of steel wire and pearlitic structure are elongated to threadiness by machinery, in perlite, the position of cementite is to being parallel to wire-drawing shaft, and in broken shape, produces very high stress value, for follow-up Spheroidizing Annealing provides more motivating force, make its Oxygen potential high, perlite is evenly distributed, stability of enhancing product performance.
(3) Spheroidizing Annealing: steel wire is hung in atmosphere protection stove; protective atmosphere is added with in atmosphere protection stove; described protective atmosphere is methyl alcohol; methanol stream amount is 10ml/min, then steel wire is warmed up to more than austenite transformation temperature 20 ~ 30 DEG C, is incubated 4 ~ 6 hours; and then progressively cool to below austenite transformation temperature 20 ~ 30 DEG C with 10 DEG C/h; be incubated 3 ~ 4 hours, then cool to the furnace and come out of the stove, austenite transformation temperature is 720 DEG C.Whole process is carried out in methyl alcohol atmosphere, to guarantee it not by decarburization.Whole process key is to control temperature, if holding temperature is too high, cementite will evenly be dissolved in austenite, thus form single uniform austenite structure, theoretical according to nodularization, uniform austenite is difficult to be transformed into spheroidite tissue, in like manner, when holding temperature is lower, cementite by abundant molten disconnected, is not also difficult to obtain spherodized structure.
(4) precision drawing: adopt cold drawing bench to carry out drawing again to steel wire, rate of compression≤10%, in this step, the rate of compression of precision drawing is little, can ensure product with stable quality.
The present invention will be described to use specific embodiment below.
Embodiment 1
(1) selection: select model to be the steel wire of SWRCH22A.
(2) drawing: adopt cold drawing bench to carry out drawing to steel wire, rate control is 50% in the present embodiment.
(3) Spheroidizing Annealing: steel wire is hung in atmosphere protection stove; protective atmosphere is added with in atmosphere protection stove; described protective atmosphere is methyl alcohol; methanol stream amount is 10ml/min, then steel wire is warmed up to more than austenite transformation temperature 20 DEG C, is incubated 4 hours; and then progressively cool to below austenite transformation temperature 30 DEG C with 10 DEG C/h; be incubated 3 hours, then cool to the furnace and come out of the stove, austenite transformation temperature is 720 DEG C.
(4) precision drawing: adopt cold drawing bench to carry out drawing again to steel wire, in the present embodiment, rate control is 10%.
Steel wire through the present embodiment process is carried out Oxygen potential and grain fineness number inspection, Oxygen potential and the grain fineness number method of inspection are existing mature technology, do not describe in detail Oxygen potential and the grain fineness number method of inspection at this, the data that inspection obtains are: nodulizing grade is 5 grades; Grain fineness number is 10 grades.Further, (500 ×) carry out metallurgical analysis under an optical microscope, and what find steel wire organizes uniform crystal particles, and perlite is evenly distributed, tissue without exception.
Embodiment 2
(1) selection: select model to be the steel wire of SWRCH22A.
(2) drawing: adopt cold drawing bench to carry out drawing to steel wire, in the present embodiment, rate control is 51%.
(3) Spheroidizing Annealing: steel wire is hung in atmosphere protection stove; protective atmosphere is added with in atmosphere protection stove; described protective atmosphere is methyl alcohol; methanol stream amount is 10ml/min, then steel wire is warmed up to more than austenite transformation temperature 25 DEG C, is incubated 5 hours; and then progressively cool to below austenite transformation temperature 25 DEG C with 10 DEG C/h; be incubated 3.5 hours, then cool to the furnace and come out of the stove, austenite transformation temperature is 720 DEG C.
(4) precision drawing: adopt cold drawing bench to carry out drawing again to steel wire, in the present embodiment, rate control is 8%.
Steel wire through the present embodiment process is carried out Oxygen potential and grain fineness number inspection, Oxygen potential and the grain fineness number method of inspection are existing mature technology, do not describe in detail Oxygen potential and the grain fineness number method of inspection at this, the data that inspection obtains are: nodulizing grade is 6 grades; Grain fineness number is 11 grades.Further, (500 ×) carry out metallurgical analysis under an optical microscope, and what find steel wire organizes uniform crystal particles, and perlite is evenly distributed, tissue without exception.
Embodiment 3
(1) selection: select model to be the steel wire of SWRCH22A.
(2) drawing: adopt cold drawing bench to carry out drawing to steel wire, in the present embodiment, rate control is 55%.
(3) Spheroidizing Annealing: steel wire is hung in atmosphere protection stove; protective atmosphere is added with in atmosphere protection stove; described protective atmosphere is methyl alcohol; methanol stream amount is 10ml/min, then steel wire is warmed up to more than austenite transformation temperature 30 DEG C, is incubated 6 hours; and then progressively cool to below austenite transformation temperature 20 DEG C with 10 DEG C/h; be incubated 4 hours, then cool to the furnace and come out of the stove, austenite transformation temperature is 720 DEG C.
(4) precision drawing: adopt cold drawing bench to carry out drawing again to steel wire, in the present embodiment, rate control is 6%.
Steel wire through the present embodiment process is carried out Oxygen potential and grain fineness number inspection, Oxygen potential and the grain fineness number method of inspection are existing mature technology, do not describe in detail Oxygen potential and the grain fineness number method of inspection at this, the data that inspection obtains are: nodulizing grade is 6 grades; Grain fineness number is 12 grades.Further, (500 ×) carry out metallurgical analysis under an optical microscope, and what find steel wire organizes uniform crystal particles, and perlite is evenly distributed, tissue without exception.
From each embodiment above-mentioned, its grain fineness number >=10 grade of steel wire after treatment, uniform crystal particles, nodulizing grade >=5 grade, Oxygen potential is high, perlite is evenly distributed, tissue without exception, possesses plastic deformation ability strong, is applicable to follow-up plastic working and is shaped, guarantee to obtain size, surperficial superior product, guarantee that subsequent heat treatment meets its finished product and uses standard-required simultaneously.As can be seen from above index, its properties is obviously superior to existing market analogous products, can better apply, and improve use properties and the life-span of product, have good market outlook, the company of can be creates considerable economic benefit.
The above, it is only preferred embodiment of the present invention, not technical scope of the present invention is imposed any restrictions, thus every above embodiment is done according to technical spirit of the present invention any trickle amendment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (2)
1. a production technique for high Oxygen potential fastener wire, is characterized in that: include following steps:
(1) selection: select model to be the steel wire of SWRCH22A;
(2) drawing: adopt cold drawing bench to carry out drawing to steel wire, rate of compression >=50%;
(3) Spheroidizing Annealing: steel wire is hung in atmosphere protection stove, protective atmosphere is added with in atmosphere protection stove, then steel wire is warmed up to more than austenite transformation temperature 20 ~ 30 DEG C, be incubated 4 ~ 6 hours, and then progressively cool to below austenite transformation temperature 20 ~ 30 DEG C with 10 DEG C/h, be incubated 3 ~ 4 hours, then cool to the furnace and come out of the stove, austenite transformation temperature is 720 DEG C;
(4) precision drawing: adopt cold drawing bench to carry out drawing again to steel wire, rate of compression≤10%.
2. the production technique of a kind of high Oxygen potential fastener wire according to claim 1, it is characterized in that: described protective atmosphere is methyl alcohol, methanol stream amount is 10ml/min.
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| CN105478502A (en) * | 2015-12-29 | 2016-04-13 | 东莞市科力钢铁线材有限公司 | Production process of non-annealed wire material for pulling rivet pull rod |
| CN105525223A (en) * | 2015-12-29 | 2016-04-27 | 东莞市科力钢铁线材有限公司 | Production process for super-plastic steel and iron material for large-diameter hexagon bolt |
| CN105543665A (en) * | 2015-12-29 | 2016-05-04 | 东莞市科力钢铁线材有限公司 | Production technology of anti-extrusion cold-heading steel material for pointed-tail products |
| CN105568155A (en) * | 2015-12-29 | 2016-05-11 | 东莞市科力钢铁线材有限公司 | Production process of super-plasticity low-carbon steel material used for turning rivet |
| CN105568146A (en) * | 2015-12-29 | 2016-05-11 | 东莞市科力钢铁线材有限公司 | Production process of tiny chamfering special-shaped line for precise products |
| CN108160741A (en) * | 2017-12-28 | 2018-06-15 | 东莞科力线材技术有限公司 | Press part steel alloy wire rod preparation method, press part and its hardening and tempering process |
| CN108220796A (en) * | 2017-12-28 | 2018-06-29 | 东莞科力线材技术有限公司 | A kind of sports equipment connecting shaft wire rod and preparation method thereof |
| CN108213095A (en) * | 2017-12-28 | 2018-06-29 | 东莞科力线材技术有限公司 | A kind of fan net counter-bending steel wire of super-strength thin footpath and preparation method thereof |
| CN108246818A (en) * | 2017-12-28 | 2018-07-06 | 东莞科力线材技术有限公司 | A kind of car belt pull rod mild steel material and its preparation process |
| 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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| CN111020125A (en) * | 2019-12-24 | 2020-04-17 | 苏州天东紧固件有限公司 | Preparation method of high-strength low-temperature-resistant corrosion-resistant fastener |
| CN111375649A (en) * | 2018-12-29 | 2020-07-07 | 东莞科力线材技术有限公司 | Preparation method of automobile fastener wire |
| CN111378905A (en) * | 2018-12-29 | 2020-07-07 | 东莞科力线材技术有限公司 | Preparation method of fastener wire of baby carrier |
| CN113151654A (en) * | 2021-04-26 | 2021-07-23 | 东南大学 | Processing method of medium carbon alloy steel |
| CN113578997A (en) * | 2021-08-03 | 2021-11-02 | 南京超明精密合金材料有限公司 | Processing technology of super free-cutting precision alloy rod and wire |
| CN113667816A (en) * | 2021-08-18 | 2021-11-19 | 中天钢铁集团有限公司 | Annealing process of drywall nail steel semi-finished steel wire |
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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: 523000 Guangdong province Dongguan city Wangniudun Industrial Park Dongxing Dongguan Keli steel wire Co. Ltd. Patentee before: Dongguan Kelee Steel Wire Co., Ltd. |
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