CN101045238A - Online softening rolling method for medium carbon alloy cold forging steel - Google Patents
Online softening rolling method for medium carbon alloy cold forging steel Download PDFInfo
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- CN101045238A CN101045238A CN 200710022170 CN200710022170A CN101045238A CN 101045238 A CN101045238 A CN 101045238A CN 200710022170 CN200710022170 CN 200710022170 CN 200710022170 A CN200710022170 A CN 200710022170A CN 101045238 A CN101045238 A CN 101045238A
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Abstract
An in-line softening and rolling technology for the cold-foraged medium-carbon alloy steel features use of high-speed wire rolling mill and includes such steps as heating billet to 950-1180 deg.C, primary, medium and pre-fine rollings, cooling to 700-820 deg.C by water tank, fine rolling, water cooling to 680-780 deg.C, discharging wire, cooling at the cooling speed of 0.01-0.5 deg.C/S for 600-2400 S, and natural cooling. Its advantages are high speed and product quality and saving energy.
Description
Technical field
It is rolling to the invention belongs to metal wire rod, carbon alloy cold-forging steel continuous rolling method in relating in particular to.
Background technology
The following securing member of metal fastenings, the especially M24 that uses extensively adopts the The cold heading steel cold-heading molding now.Current carbon equivalent commonly used is 0.35%～0.55% middle carbon alloy The cold heading steel.This wire rod milling method be with steel billet be heated to 1000-1150 ℃ carry out breaking down, in roll and pre-finish rolling, carrying out finish rolling more than 950 ℃ again, carry out slow cooling after rolling.This rolling mill practice is to be rolled in the junction temperature district at austenite again, the wire rod metallographic structure of producing is ferrite+pearlite+bainite/martensite, the intensity of wire rod, hardness height, the contraction percentage of area is low, securing member is made in unsuitable directly cold-heading, therefore, when making securing member, must carry out spheroidizing earlier, make material softening, change system into the cold heading technique material through overpickling, drawing again, feed the multistage cold former cold-heading molding then, and thread rolling makes securing member, carries out modifier treatment subsequently again, just can be made into 10.9,12.9 grade high-strength fasteners.Its defective is intensity, the hardness height of wire rod, and the contraction percentage of area is low, the spheroidizing complex procedures, and the processing time is long, and consumes energy is many, causes metal loss, contaminated environment, production cost height; Increase Steel Wire Surface decarburization chance, influenced the stability of quality of item.
Summary of the invention
In order to overcome the deficiency that prior art exists, the purpose of this invention is to provide a kind of middle carbon alloy cold-forging steel on-lining soften milling method.Adopt rational temperature system, cooling system and draft, utilize hot mechanical continuous rolling, the online direct acquisition of carbon alloy The cold heading steel is softening in making, simplify annealing process for deep processing, shorten annealing time, the stable article quality, save the energy, reduce and pollute.
In carbon alloy cold-forging steel on-lining soften milling method, comprise and adopt general high-speed rod-rolling mill that the middle carbon alloy cold-forging steel steel billet of heating is rolled, and characteristics are that steel billet is heated to 950-1180 ℃ and advances to roll in 1 frame breaking down, 12 frames and the pre-finish rolling of 4/8 frame; 4 frame TMCP technique for continuous rolling are adopted in finish rolling; After being pre-finish rolling, rolled piece adopts the water tank cooling, temperature is reduced to 700-820 ℃ and carries out finish rolling, rolled piece accumulative total draft is 50-85%, rate of deformation 1/5-1/30s, the rolled piece water-cooled goes out Laying head to 680-780 ℃ after the finish rolling, tells the volume that looses behind the line with the cooling velocity slow cooling 600-2400 of 0.01-0.5 ℃/s after second, and wire rod naturally cools to room temperature.950-1180 ℃ of steel billet heating, inside steel billet is organized complete austenitizing, makes rolled piece at first carry out the junior middle school in the perfect recrystallization district and rolls and pre-finish rolling.Rolled piece is quickly cooled to 720-780 ℃ by water tank subsequently, carry out aximal deformation value finish rolling at the Ar3-Ar1 two-phase region, the ferrite of separating out earlier in the cooling procedure produces deformation, when deflection acquires a certain degree, cross cold austenite generation deformation, after this ferrite and austenite all produce deformation, when deformation quantity is accumulated to a certain degree, ferrite recovers, even crystallization again.Crystallization again can not take place in austenite under this temperature, crystal grain is elongated, and can only recover when changing to a certain degree.A large amount of dislocation and the deformation bands of the inner formation of the austenite grain boundary of this extreme distortion and crystal grain put aside huge strain energy, and the nucleation rate that change this moment is high.Roll the back by certain cooling velocity slow cooling, form the thin ferrite and the pearlitic structrure of nodularization or degeneration behind the cooling transformation, do not contain bainite or martensite, so the reinforcement of material, hardness obviously descend.Intensity Rm≤750MPa, hardness HV0.1≤250, contraction percentage of area Z 〉=50%, the online direct acquisition of carbon alloy cold-forging steel wire rod is softening in making.
The cold steel of middle carbon alloy that the inventive method adopts is formed (wt%): 0.03-0.38%C, 0.18-0.40%Si, 0.60-0.80%Mn, 0.9-1.2%Cr, 0.015-0.30%Mo, S≤0.015%, P≤0.025% by following alloying element, and surplus is Fe.
The inventive method is further improved, final rolling temperature is controlled at 720-800 ℃, scope accumulative total draft 50-85%, rate of deformation 1/5-1/20s, the rolled piece water-cooled goes out Laying head to 720-760 ℃ after the finish rolling, after second, wire rod naturally cools to room temperature to diffusing volume with the cooling velocity slow cooling 800-2400 of 0.01-0.3 ℃/s after weaving silk.
The inventive method is further optimized, the finish rolling temperature control is 730-770 ℃ of scope, accumulative total draft 50-60%, rate of deformation 1/10-1/20s, the rolled piece water-cooled goes out Laying head to 720-760 ℃ after the finish rolling, after second, wire rod naturally cools to room temperature to diffusing volume with the cooling velocity slow cooling 1200-2400 of 0.01-0.2 ℃/s after weaving silk.
Compared with prior art, advantage of the present invention is that middle carbon alloy cold-forging steel wire rod online direct acquisition in the operation of rolling of adopting milling method of the present invention to produce is softening, its intensity, hardness obviously reduce, the contraction percentage of area improves, and is suitable for the cold-working deep processing, simplifies spheroidising; Energy savings reduces and pollutes, and saves additional processing cost; Reduce the spheroidizing time, avoid annealing operation to cause the skin decarburization of steel wire, help the stable article quality.
The specific embodiment
The invention will be further described below by embodiment.
Embodiment 1
The qualified molten steel of steel mill's refining, continuous casting becomes 140 square billets, and chemical composition is C:0.35%, Si:0.18%, Mn:0.68%, P:0.015%, S:0.006%, Cr:1.0%, Mo:0.18%; Reheat 1150 ℃ at the wire rolling plants steel billet, earlier through just, in and the pre-finishing mill group rolling, again by the control water-cooled, rolled piece becomes Φ 8mm dimension wire in mm finishing mill unit with 765 ℃ of finish rolling, the distortion draft is 54.5%, rate of deformation 1/20s, and rolled piece water-cooled to 750 ℃ goes out Laying head after the finish rolling, after 1200 seconds, wire rod naturally cools to room temperature and bundling to diffusing volume with the cooling velocity slow cooling of 0.2 ℃/s after weaving silk.Middle carbon alloy cold-forging steel chemical analysis is listed in the table 1, and technological parameter is listed in the table 2, and material mechanical performance is listed in the table 3.
Embodiment 2
The qualified molten steel of steel mill's refining, continuous casting becomes 140 square billets, and chemical composition is C:0.34%, Si:0.20%, Mn:0.65%, P:0.011%, S:0.005%, Cr:0.9%, Mo:0.19%; Reheat 1100 ℃ at the wire rolling plants steel billet, earlier through just, in and the pre-finishing mill group rolling, again by the control water-cooled, rolled piece becomes Φ 10mm dimension wire in mm finishing mill unit with 750 ℃ of finish rolling, the distortion draft is 56.6%, rate of deformation 1/20s, and rolled piece water-cooled to 720 ℃ goes out Laying head after the finish rolling, after 1000 seconds, wire rod naturally cools to room temperature and bundling to diffusing volume with the cooling velocity slow cooling of 0.25 ℃/s after weaving silk.Middle carbon alloy cold-forging steel chemical analysis is listed in the table 1, and technological parameter is listed in the table 2, and material mechanical performance is listed in the table 3.
Embodiment 3
The qualified molten steel of steel mill's refining, continuous casting becomes 140 square billets, and chemical composition is C:0.36%, Si:0.19%, Mn:0.63%, P:0.019%, S:0.004%, Cr:1.01%, Mo:0.19%; Reheat 1180 ℃ at the wire rolling plants steel billet, earlier through just, in and the pre-finishing mill group rolling, again by the control water-cooled, rolled piece becomes Φ 12mm dimension wire in mm finishing mill unit with 800 ℃ of finish rolling, the distortion draft is 58.2%, rate of deformation 1/20s, and rolled piece water-cooled to 760 ℃ goes out Laying head after the finish rolling, after 900 seconds, wire rod naturally cools to room temperature and bundling to diffusing volume with the cooling velocity slow cooling of 0.3 ℃/s after weaving silk.Middle carbon alloy cold-forging steel chemical analysis is listed in the table 1, and technological parameter is listed in the table 2, and material mechanical performance is listed in the table 3.
Table 1
| C | Si | Mn | P | S | Cr | Mo | |
| Embodiment 1 | 0.35 | 0.18 | 0.68 | 0.015 | 0.006 | 1.00 | 0.18 |
| Embodiment 2 | 0.34 | 0.20 | 0.65 | 0.011 | 0.005 | 0.90 | 0.19 |
| Embodiment 3 | 0.36 | 0.19 | 0.63 | 0.019 | 0.004 | 1.01 | 0.19 |
Table 2
| Technology | The junior middle school roll temperature (℃) | Final rolling temperature (℃) | Distortion draft (%) | Rate of deformation (1/s) | Go out the Laying head temperature (℃) | Slow cooling speed (℃/s) | The slow cooling time (second) |
| Embodiment 1 | 1150 | 765 | 54.5 | 1/20 | 750 | 0.2 | 1200 |
| Embodiment 2 | 1100 | 750 | 56.6 | 1/20 | 720 | 0.25 | 1000 |
| Embodiment 3 | 1180 | 800 | 58.2 | 1/20 | 760 | 0.3 | 900 |
Table 3
| Specification | Rm(MPa) | A(％) | Z(％) | |
| Embodiment 1 | Φ8 | 700 | 28 | 60.5 |
| Embodiment 2 | Φ10 | 685 | 29 | 59 |
| Embodiment 3 | Φ12 | 730 | 27 | 50.5 |
Claims (6)
1, middle carbon alloy cold-forging steel on-lining soften milling method, comprise and adopt general high-speed rod-rolling mill that the middle carbon alloy cold-forging steel steel billet of heating is carried out continuous rolling, it is characterized in that steel billet be heated to 950～1100 ℃ carry out rolling in 1 frame breaking down, 12 frames, the pre-finish rolling of 4/8 frame; 4 frame TMCP rolling mill practices are adopted in finish rolling, after being pre-finish rolling, the cooling of employing water tank, the rolled piece temperature is reduced to 700-820 ℃ and carries out finish rolling, rolled piece accumulative total draft is 50%-85%, rate of deformation 1/5-1/30s, and the rolled piece water-cooled goes out Laying head to 680-780 ℃ after the finish rolling, tell the volume that looses behind the line with the cooling velocity slow cooling 600-2400 of 0.01-0.5 ℃/s after second, wire rod naturally cools to room temperature.
2, middle carbon alloy cold-forging steel on-lining soften milling method according to claim 1, the carbon alloy cold-forging steel is formed (wt%): 0.03-0.38%C, 0.18-0.40%Si, 0.60-0.80%Mn, 0.9-1.2%Cr, 0.015-0.30%Mo, S≤0.015%, P≤0.025% by following alloying element in it is characterized in that, surplus is Fe.
3, middle carbon alloy cold-forging steel on-lining soften milling method according to claim 1, it is characterized in that final rolling temperature is controlled at 720-800 ℃ of scope, accumulative total draft 50-85%, rate of deformation 1/5-1/20s, the rolled piece water-cooled goes out Laying head to 720-760 ℃ after the finish rolling, after second, wire rod naturally cools to room temperature to diffusing volume with the cooling velocity slow cooling 800-2400 of 0.01-0.3 ℃/s after weaving silk.
4, middle carbon alloy cold-forging steel on-lining soften milling method according to claim 1, it is characterized in that the finish rolling temperature control is 730-770 ℃ of scope, accumulative total draft 50-60%, rate of deformation 1/10-1/20s, the rolled piece water-cooled goes out Laying head to 720-760 ℃ after the finish rolling, after second, wire rod naturally cools to room temperature to diffusing volume with the cooling velocity slow cooling 1200-2400 of 0.01-0.2 ℃/s after weaving silk.
5, middle carbon alloy cold-forging steel on-lining soften milling method according to claim 1 is characterized in that the wire rod that this method is produced is organized as degenerate perlite+ferritic structure.
6, middle carbon alloy cold-forging steel on-lining soften milling method according to claim 4 is characterized in that wire rod tensile strength R
m≤ 750Mpa, hardness HV0.1≤250, contraction percentage of area Z 〉=50%.
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| CN102218448A (en) * | 2011-06-04 | 2011-10-19 | 首钢总公司 | Production method for optimizing drawing performance of steel wire rod for carbon steel welding wire |
| CN102517500A (en) * | 2011-12-16 | 2012-06-27 | 内蒙古包钢钢联股份有限公司 | Rolling process for producing 35CrMo alloy cold forging steel through adopting small billets |
| CN103572024A (en) * | 2013-11-06 | 2014-02-12 | 南京工程学院 | Non-phase-change rapid softening treatment technology of cold work steel wire rod for fastener |
| CN104593673A (en) * | 2014-12-24 | 2015-05-06 | 张家港联峰钢铁研究所有限公司 | Medium carbon non-annealed cold heading steel hot rolled wire rod and production method thereof |
| CN104759469A (en) * | 2015-03-31 | 2015-07-08 | 邢台钢铁有限责任公司 | Production method for non-annealed medium carbon cold heading steel hot-rolled wire rod |
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