CN104878166A - Spheroidized annealing process for shortening annealing cycle of hot rolled wire rods - Google Patents
Spheroidized annealing process for shortening annealing cycle of hot rolled wire rods Download PDFInfo
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Abstract
The invention relates to a spheroidized annealing process for shortening the annealing cycle of hot rolled wire rods, belongs to the technical field of metal wire annealing process. The technical scheme of the spheroidized annealing process lies in that firstly, lamellar pearlites are heated to 770-790 DEG C, heat preservation is carried out for a certain time to enable the lamellar pearlite to be fused quickly, so that the undissolved carbide particles can promote the transformation of austenite into the spheroidized microscopic structure; the temperature is lowered to 710-730 DEG C, heat preservation is performed for 4-6 hours to enable the fused cementite to gather spherically, and along with the time extension of heat preservation, the rate of spheroidization of the cementite is gradually improved, and the uniformity is gradually improved. A slow three-stage cooling manner is adopted, so that the uniformity of the spheroidized structure is improved. According to the spheroidized annealing process for shortening the annealing cycle of hot rolled wire rods, the following advantages are achieved: the annealing effect is good, the technological process is simple, the annealing cycle is short, the production efficiency is high, and the cost is low. With the adoption of the spheroidized annealing process provided by the invention, the processed wire rods of fasteners are uniform in metallographic structure, high in toughness, high in malleability, low in harness, are suitable for subsequent moulding and processing forming, and the products are low in cold-forming cracking rate.
Description
Technical field
The present invention relates to a kind of gren rod annealing process, particularly a kind of carbide annealing process that can shorten the SCM435 gren rod annealing cycle, belong to metal wire annealing process technical field.
Background technology
Spheroidizing Annealing is one of Basic Ways improving structure of steel and performance, carbide spheroidization in the microtexture of ferrous materials can be made by Spheroidizing Annealing process, reduce the hardness of material, improve the moulding of material, reduce the resistance to deformation of material, make material be easy to moulding and shape.Spheroidizing Annealing process often needs the time reaching more than 20h, is power consumption, maximum operation consuming time in fastening piece production process.Therefore, by optimizing annealing process, annealing cycle shortening, has great importance.
China Patent No. CN102994710A discloses a kind of carbide annealing process of superplasticity fastener wire rod, the material of described fastener wire is structural alloy steel SCM435, this annealing process takes following method and step: A, fastener wire is placed in heat treatment furnace, the industrial nitrogen that purity is 99.99% is filled with in heat treated stove, when the temperature to 650 in stove DEG C, close industrial nitrogen, dissociated methanol gas is filled with in heat treated stove, again the temperature in stove is risen to 750 DEG C with the speed of 95-130 DEG C/h, insulation 6h; B, first stage cooling: adopt air cooling way to be cooled to 670 DEG C with the speed of 30 DEG C/h the temperature in stove, insulation 5h, after insulation terminates, closes dissociated methanol gas, is filled with the industrial nitrogen that purity is 99.99% in heat treated stove; C, subordinate phase cool: continue the temperature in stove to adopt air cooling way to be cooled to 400 DEG C with the speed of 50 DEG C/h; D, phase III cooling: fastener wire naturally cools to normal temperature.The main drawback of this carbide annealing process is that annealing time is long, big energy-consuming.
At present, when production fastener wire, carry out Slow cooling or annealing according to existing technique to fastener wire, the annealing cycle is partially long, affects production efficiency; In addition, longer annealing soaking time, causes energy consumption comparatively large, causes the rising of tooling cost.Along with the fast development of producing, effectively must enhance productivity, will carry forward vigorously energy-saving and emission-reduction simultaneously, meet environmental protection requirement, it is very necessary for therefore improving annealing process aborning.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of carbide annealing process shortening the gren rod annealing cycle, this can under guarantee quality product prerequisite, further annealing cycle shortening, cuts down finished cost, and meets the needs of production.
The technical scheme solved the problems of the technologies described above is:
Shorten the carbide annealing process of gren rod annealing cycle, it comprises the 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 770-790 DEG C, insulation 1-3 hour;
B, first stage cooling: the temperature in stove is cooled to 710-730 DEG C with the speed of 30 DEG C/h, insulation 4-6 hour;
C, subordinate phase cool: continue the temperature in stove to be cooled to 490-510 DEG C with the speed of 50 DEG C/h;
D, phase III cooling: coiling comes out of the stove naturally cools to normal temperature.
The carbide annealing process of above-mentioned shortening gren rod annealing cycle, the preferred version of described processing step is as follows:
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 780 DEG C, be incubated 1.5 hours;
B, first stage cooling: the temperature in stove is cooled to 720 DEG C with the speed of 30 DEG C/h, is incubated 5 hours;
C, subordinate phase cool: continue the temperature in stove to be cooled to 500 DEG C with the speed of 50 DEG C/h;
D, phase III cooling: coiling comes out of the stove naturally cools to normal temperature.
The carbide annealing process of above-mentioned shortening gren rod annealing cycle; in described steps A; first the industrial nitrogen that purity is 99.99 is filled with in heat treated stove; when in-furnace temperature is warming up to 630 DEG C; the protective atmosphere passed into will change continuing nitrogen+RX gas into; when in-furnace temperature is warming up to 680 DEG C, close industrial nitrogen, in a heat treated stove, be filled with RX gas.
The carbide annealing process of above-mentioned shortening gren rod annealing cycle, is warming up to 760-780 DEG C by the temperature in stove with 100-140 DEG C/h in described steps A.
The carbide annealing process of above-mentioned shortening gren rod annealing cycle, in described step C, when thermal treatment in-furnace temperature is cooled to 665 DEG C, closes RX gas, is filled with industrial nitrogen, with the RX gas in emptying stove in heat treated stove.
The carbide annealing process of above-mentioned shortening gren rod annealing cycle, described first stage cooling and the cooling of described subordinate phase are cooled by air-cooled mode.
The invention has the beneficial effects as follows:
Method of the present invention adopts isothermal spheroidizing technique principle, first sheet perlite is warming up to 770-790 DEG C, insulation appropriate time makes sheet globular cementite quick fuse, and ensureing the ununiformity that keeps in austenite to a certain degree, undissolved carbide particle is promoted, and austenite is to the transformation of nodularization microstructure.Then adopt and be cooled to 710-730 DEG C to be incubated 4-6 hour, the cementite of fusing is assembled in spherical, and with holding time, cementite Oxygen potential raises gradually, and uniformity coefficient raises gradually.The Slow cooling mode adopting first stage cooling, subordinate phase cooling and phase III to cool can ensure the homogeneity of spherodized structure.
The present invention adopt suitable temperature rise rate, soaking time, first stage cooling, subordinate phase cooling and phase III cooling technique reach that annealing effect is good, technical process is simple, the annealing cycle is short, production efficiency is high, lower-cost advantage.
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 mouldingly to shape, product cold shaping cracking rate is low.
Embodiment
Below in conjunction with example, the present invention is described in further detail.
Embodiment 1
Shorten the carbide annealing process of SCM435 gren rod annealing cycle, it comprises the steps:
A, be that the fastener wire of SCM435 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 630 DEG C with the speed of 100 DEG C/h, the protective atmosphere passed into will change continuing nitrogen+RX gas into, when in-furnace temperature is warming up to 680 DEG C, close industrial nitrogen, in a heat treated stove, be filled with RX gas, again the temperature in stove is risen to 770 DEG C, be incubated 3 hours;
B, first stage cooling: the temperature in stove is cooled to 710 DEG C by air-cooled mode with the speed of 30 DEG C/h, is incubated 6 hours;
C, subordinate phase cool: continue the temperature in stove to be cooled to 665 DEG C by air-cooled mode with the speed of 50 DEG C/h, close RX gas, industrial nitrogen is filled with in heat treated stove, with the RX gas in emptying stove, continue through air-cooled mode, with the speed of 50 DEG C/h, in-furnace temperature is cooled to 490 DEG C;
D, phase III cooling: fastener wire naturally cools to normal temperature.
Horizontal for the fastener wire crossed through this instance processes (1000X) is under an optical microscope carried out metallurgical analysis, find that on ferrite matrix, Dispersed precipitate granular (or spherical) carbide, and disperse is even.
Embodiment 2
Shorten the carbide annealing process of SCM435 gren rod annealing cycle, it comprises the steps:
A, be that the fastener wire of SCM435 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 630 DEG C with the speed of 120 DEG C/h, the protective atmosphere passed into will change continuing nitrogen+RX gas into, when in-furnace temperature is warming up to 680 DEG C, close industrial nitrogen, in a heat treated stove, be filled with RX gas, again the temperature in stove is risen to 780 DEG C, be incubated 1.5 hours;
B, first stage cooling: the temperature in stove is cooled to 720 DEG C by air-cooled mode with the speed of 30 DEG C/h, is incubated 5 hours;
C, subordinate phase cool: continue the temperature in stove to be cooled to 665 DEG C by air-cooled mode with the speed of 50 DEG C/h, close RX gas, industrial nitrogen is filled with in heat treated stove, with the RX gas in emptying stove, continue through air-cooled mode, with the speed of 50 DEG C/h, in-furnace temperature is cooled to 500 DEG C;
D, phase III cooling: fastener wire naturally cools to normal temperature.
Horizontal for the fastener wire crossed through this instance processes (1000X) is under an optical microscope carried out metallurgical analysis, find that on ferrite matrix, Dispersed precipitate granular (or spherical) carbide, and disperse is even.
Embodiment 3
Shorten the carbide annealing process of SCM435 gren rod annealing cycle, it in turn includes the following steps:
A, be that the fastener wire of SCM435 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 630 DEG C with the speed of 140 DEG C/h, the protective atmosphere passed into will change continuing nitrogen+RX gas into, when in-furnace temperature is warming up to 680 DEG C, close industrial nitrogen, in a heat treated stove, be filled with RX gas, again the temperature in stove is risen to 790 DEG C, be incubated 1 hour;
B, first stage cooling: the temperature in stove is cooled to 730 DEG C by air-cooled mode with the speed of 30 DEG C/h, is incubated 4 hours;
C, subordinate phase cool: continue the temperature in stove to be cooled to 665 DEG C by air-cooled mode with the speed of 50 DEG C/h, close RX gas, industrial nitrogen is filled with in heat treated stove, with the RX gas in emptying stove, continue through air-cooled mode, with the speed of 50 DEG C/h, in-furnace temperature is cooled to 510 DEG C;
D, phase III cooling: fastener wire naturally cools to normal temperature.
Horizontal for the fastener wire crossed through this instance processes (1000X) is under an optical microscope carried out metallurgical analysis, find that on ferrite matrix, Dispersed precipitate granular (or spherical) carbide, and disperse is even.
Embodiment 1-3, adopts the method for GB/T230, leer pan sliver transvers section carries out hardness test, and inspection numerical value is as table 1.
The annealing cycle of table 1 embodiment 1-3 and hardness result
The result display of embodiment 1-3, the annealing cycle is short, production efficiency is high, the advantage of energy saving and cost lowering to adopt processing method process fastener wire of the present invention to have, fastener wire ductility simultaneously after process is high, hardness is low, be applicable to follow-up cold machine-shaping, product cold shaping cracking rate is low.
The present invention is directed to current wire rod transformation of the way industry annealing cycle longer, the higher problem of energy consumption, by optimizing parameter and annealing, realizing the object of saving energy and reduce the cost, enhancing productivity, a kind ofly simplify annealing method for high-strength cold forging steel provides.
The present invention, without the need to increasing equipment and investment, does not increase production cost, makes full use of existing installation and technique, adopt reasonable parameter and annealing, achieve the production method shortening the Spheroidizing Annealing cycle, producing under fast-developing situation, for the enterprise product market competitiveness provides guarantee.
Claims (6)
1. shorten the carbide annealing process of gren rod annealing cycle, it is characterized in that: it comprises the 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 770-790 DEG C, insulation 1-3 hour;
B, first stage cooling: the temperature in stove is cooled to 710-730 DEG C with the speed of 30 DEG C/h, insulation 4-6 hour;
C, subordinate phase cool: continue the temperature in stove to be cooled to 490-510 DEG C with the speed of 50 DEG C/h;
D, phase III cooling: coiling comes out of the stove naturally cools to normal temperature.
2. the carbide annealing process of shortening gren rod annealing cycle according to claim 1, is characterized in that: the preferred version of described processing step is as follows:
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 780 DEG C, be incubated 1.5 hours;
B, first stage cooling: the temperature in stove is cooled to 720 DEG C with the speed of 30 DEG C/h, is incubated 5 hours;
C, subordinate phase cool: continue the temperature in stove to be cooled to 500 DEG C with the speed of 50 DEG C/h;
D, phase III cooling: coiling comes out of the stove naturally cools to normal temperature.
3. the carbide annealing process of shortening gren rod annealing cycle according to claim 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 in-furnace temperature is warming up to 630 DEG C; the protective atmosphere passed into will change continuing nitrogen+RX gas into; when in-furnace temperature is warming up to 680 DEG C, close industrial nitrogen, in a heat treated stove, be filled with RX gas.
4. the carbide annealing process of shortening gren rod annealing cycle according to claim 3, is characterized in that: in described steps A, the temperature in stove is warming up to 760-780 DEG C with 100-140 DEG C/h.
5. the carbide annealing process of shortening gren rod annealing cycle according to claim 4, it is characterized in that: in described step C, when thermal treatment in-furnace temperature is cooled to 665 DEG C, close RX gas, industrial nitrogen is filled with, with the RX gas in emptying stove in heat treated stove.
6. the carbide annealing process of shortening gren rod annealing cycle according to claim 5, is characterized in that: described first stage cooling and the cooling of described subordinate phase are cooled by air-cooled mode.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| 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 |
-
2015
- 2015-05-26 CN CN201510272405.5A patent/CN104878166A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
| CN113667816B (en) * | 2021-08-18 | 2023-03-14 | 中天钢铁集团有限公司 | Annealing process of drywall nail steel semi-finished steel wire |
| 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: 20150902 |