CN101327490A - Method for producing good-quality high-carbon steel green rod for drawing - Google Patents
Method for producing good-quality high-carbon steel green rod for drawing Download PDFInfo
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Abstract
The invention discloses a production method to draw high-quality high-carbon steel green rod, which includes the following steps: firstly, the high-carbon continuous cast steel is heated, and then goes through the treatment processes of rough rolling, medium rolling and prefinishing rolling so that the cumulative rolling elongation n1 equals 65 to 120 times; secondly, the rolled pieces are prewatercooled; and then the rolled pieces go through the prefinishing rolling process for 4 to 10 times, wherein, the elongation n2 equals to 1. 1 to 1. 3 times each time and the finishing temperature is 920 to 1090 degrees centigrade; and then the rolled pieces are prewatercooled for a second time, wherein, the rolled pieces reach a drawing out temperature of 830 to 900 degrees centigrade and are made into scattered rolls; in the end, the scattered rolls are air-cooled, wherein, the temperature of the scattered rolls at the outlet of the air cooling roll table is 330 to 450 degrees centigrade; the rolls are cooled in the air environment to room temperature to produce high quality high-carbon steel green rods for drawing, which have large numbers of sorbites, small interlamellar spacing and stable mechanical properties and are not apt to brittle fracture in the production process.
Description
Technical field
The present invention relates to the production and processing of steel and wire rod, refer to a kind of production method of good-quality high-carbon steel green rod for drawing particularly.
Background technology
Carbon structure steel wire rod particularly carbon content reaches 0.6～0.8% high-quality carbon steel wire rod with high for making the important source material of screw, bolt, nut, steel wire, steel wire rope, drill bit, ball, welding rod and spring steel wire etc.The high-quality carbon steel wire rod with high of different demands and different purposes, its mechanical performance standard are also different.And the chemical composition of steel, institutional framework and grain size etc. particularly for being drawn into the high-quality carbon steel wire rod with high of different size steel wire, not only require its intensity height, but also require its extensibility and good toughness the mechanical performance decisive role of steel.
The conventional good-quality high-carbon steel green rod of producing is generally only required check wire surface quality, chemical composition, mechanical property, macrostructure and decarburized layer.Part also requires to check field trash, sorbite rate in the steel tissue to the strict wire fabrication producer of quality, but the sorbite sheet interlayer spacing is not done any requirement.
In iron-carbon alloy, the austenite of hypo eutectoid composition or eutectoid composition is cooled to A1 when following, to be decomposed into the mixture of ferrite and cementite, be divided into three kinds of pearlite, sorbite or troostites again according to the difference of its grain size, they are synusia shape structure usually.The sorbite tissue is thinner than pearlitic structrure, and its carbide decentralization is very big, and is spherical, thereby sorbite has good comprehensive mechanical performance.
Vertical range in the sorbite tissue between adjacent two cementites or the ferrite center is called sorbitic sheet interlayer spacing, and the size of sheet interlayer spacing depends mainly on sorbitic formation temperature.Along with the increase of cooling velocity, austenite changes sorbitic temperature into and reduces gradually, that is the degree of supercooling when changing constantly increases, and the sorbite sheet interlayer spacing that changes gained also constantly reduces, and sorbitic sheet interlayer spacing is about 100～250nm under general state.
The gren rod drawing belongs to cold deformation, and deflection is big in the drawing process, and as pull to the silk thread of Φ 0.3mm from Φ 6mm wire rod, deflection is 400 times, and the resistance of deformation that material bore is very big.Brittle failure appears in conventional high-quality high-carbon steel easily when drawing, main cause is the even field trash etc. that exists of carbon segregation, tissue odds.For example be used for the excellent carbon 70 steel gren rods of drawing, its interior tissue can not have crisp hard as martensite, large particle carbide etc., but ferrite quantity for a long time, and its intensity will reduce.Thereby, drawing with the combination property of material particularly institutional framework, cleanliness factor etc. have relatively high expectations, to reduce enhanced stretch resistance, local deformation and the brittle failure of gren rod in the wire drawing die head.Have only the gren rod that sorbite quantity is many, sheet interlayer spacing is little, could be in drawing process resistance little and be difficult for brittle failure.With excellent carbon 70 steel gren rods, the sorbite rate in its tissue should be greater than 70% for drawing, but sorbitic performance is decided by its sheet interlayer spacing fully.
Before the present invention, it is CN1840729A " high carbon steel wires excellent in spinnability and method for producing same " that the production method of acquisition high-carbon steel gren rod has the Chinese invention patent application publication number, and publication number is CN 1778486A " after-roll reinforced cooling process for 82 B wire rod steel strand ", preceding a kind of manufacture method is mainly reflected in: the one, and the high-carbon steel wire wire rod comprises 0.65～1.20% carbon, 0.05～1.2% silicon, 0.2～1.0% manganese and 0.35% or the chromium of following (comprising 0%), also comprising respectively estimates one's own ability is restricted to 002% or following p and s; The 2nd, wherein 80% or above metal structure constitute by pearlitic texture; The 3rd, show between the average tensile strength Rm of high-carbon steel wire wire rod and the average lamellar spacing λ
Relation.A kind of process in back is mainly reflected in: the roller table speed when taking to strengthen phase transformation, phase transformation place add accessory fan reinforced transformation cooling, regulate the air quantity transverse distribution by minor flaps makes even etc. the measure of horizontal cooling stablize the wire rod structure property, and to obtain the average sheet interlayer spacing of sorbite and be 0.18 μ m, average pearlite pelletizing diameter and be 8.4 μ m, wire rod tensile strength be 1160～1220Mpa, with a kind of steel strand wires 82B wire rod that encloses poor performance≤40Mpa, the even sorbite tissue of poker.
The weak point of above-mentioned two kinds of production methods is: the one, and pearlite interlaminar spacing is greater than the sorbite sheet interlayer spacing, and pearlitic combination property is poor than sorbite; The 2nd, this method has only proposed the relation between average lamella gap lambda and the hot strength Rm, but the process of unexposed control sorbite sheet lamellar spacing also is difficult to the accurate size of controlling sorbitic quantity and sheet lamellar spacing in actual production.How controlling sorbitic formation temperature and degree of supercooling when rolling, and then control sorbitic sheet interlayer spacing, is the difficult problem that the iron and steel scientific research personnel is making great efforts exploration up to now always.
Summary of the invention
Purpose of the present invention be exactly to provide that a kind of sorbite quantity is many, the sorbite sheet interlayer spacing is little, mechanical property is stable, be not easy the production method of the good-quality high-carbon steel green rod for drawing of local deformation or brittle failure in process of production.
For achieving the above object, the production method of the good-quality high-carbon steel green rod for drawing that the present invention is designed, adopt the cold new technology of controlled rolling and three stages control, promptly roll sorbitic formation temperature of wire rod and degree of supercooling by heating in rolling time control, regulate sorbite quantity and sheet interlayer spacing, its concrete technology in turn includes the following steps:
1) at first the high-carbon steel continuous casting steel billet is carried out heat temperature raising, and 970～1100 ℃ high temperature recrystallization zone carry out roughing, in roll and pre-finish rolling is handled, make the accumulative total percentage elongation n of rolled piece
1=65～120 times;
2) secondly rolled piece is carried out pre-water-cooled and handle, cooling velocity is controlled at 10～40 ℃/s, is controlled at 0.8～2.2s cool time;
3) finish rolling of then rolled piece being carried out 4～10 passages is handled, and the start rolling temperature of finish rolling is 900～990 ℃, every time percentage elongation n
2=1.1～1.3 times, the finishing temperature of finish rolling is controlled at 920～1090 ℃;
4) again rolled piece is carried out water-cooled and handle, begin to cool down temperature and be controlled at 920～1050 ℃, cooling velocity is controlled at 50～350 ℃/s, and the temperature that cooling is weaved silk after finishing is controlled at 830～900 ℃, makes the volume that looses;
5) involve in the sector-style cold treatment to loosing at last, air-cooled speed is controlled at 2～10 ℃/s, and the collection volume temperature that rolls out air-cooled roller-way of loosing is controlled at 330～450 ℃, places surrounding air to be cooled to normal temperature, can make good-quality high-carbon steel green rod for drawing.
As improvement project of the present invention, in step 1), 990～1080 ℃ high temperature recrystallization zones steel billet is carried out roughing, in roll and pre-finish rolling is handled, make the accumulative total percentage elongation n of rolled piece
1=70～110 times.In step 2) in, the cooling velocity of rolled piece being carried out pre-water-cooled processing is controlled at 15～25 ℃/s, is controlled at 1.0～2.0s cool time.In step 3), the start rolling temperature that rolled piece is carried out the finish rolling processing is 925～990 ℃, every time percentage elongation n
2=1.15～1.28 times, the finishing temperature of finish rolling is controlled at 930～1030 ℃.In step 4), the cooling velocity of rolled piece being carried out the water-cooled processing is controlled at 60～290 ℃/s, and the temperature that cooling is weaved silk after finishing is controlled at 830～890 ℃.In step 5), the air-cooled speed that involves in the sector-style cold treatment is controlled at 3～8 ℃/s to loosing, can control the air output of cooling blower according to Various Seasonal, generally summer, air output was controlled at 60～85% of the specified air output of cooling blower, winter, air output was controlled at 30～50% of the specified air output of cooling blower, with the air-cooled speed all-the-time stable of guaranteeing rolled piece within the scope of design.
As the further improvement project of the present invention, in above-mentioned steps 5) in, the preferable air-cooled speed involve in the sector-style cold treatment to loosing is controlled at 3～5 ℃/s, preferably stablely is controlled at 3～4 ℃/s.Test confirms: the good-quality high-carbon steel green rod for drawing that is obtained under above-mentioned optimizing technology parameters condition has that sorbite quantity is many, sheet interlayer spacing is little, resistance is little and be difficult for the good comprehensive mechanical performance of brittle failure in drawing process.
The high-carbon steel continuous casting steel billet is carried out pre-water-cooled, water-cooled and air-cooled control before and after finish rolling be key of the present invention.Find that after deliberation sorbite quantity and sheet interlayer spacing are mainly determined by the rolled piece cooling velocity.The cooling of rolling front and back mainly can be played the effect of following four aspects: the first, and the pre-water-cooled before the finish rolling mainly is the temperature of regulating rolled piece heart portion and surface, controls the temperature that rolled piece advances mm finishing mill unit simultaneously.Second, water-cooled after the finish rolling is that austenite is controlled cooling, can impel to generate ferrite core in austenite grain boundary and Zona transformans even the deformed austenite, impel the amount of ferrite nucleus to generate simultaneously, grow up to a greater degree, can obtain ferrite crystal grain layer of uniform size.Ferrite is separated out the back matrix becomes rich carbon austenitic, so cementite lamella is also even, tiny.The 3rd, accelerate austenitic transformation rate, make most of austenite change sorbite into, guarantee the ratio of sorbite tissue in the steel.The 4th, suppressed the coarsening rate of ferrite, cementite crystal grain after the phase transformation, refinement the grain size of finished product wire rod.This shows that production method of the present invention has following advantage:
One, the present invention accurately controls the temperature of the forward and backward rolled piece of finish rolling in process of production and rolls the cooling velocity of back different phase, has improved the institutional framework ratio of steel billet, makes its sorbite rate be not less than 75%; Refinement the crystallite dimension of steel billet, its sorbite sheet interlayer spacing is controlled between 100～180nm; Thereby make gren rod have good comprehensive mechanical performance, its yield strength Rel on average can reach 620MPa, tensile strength Rm average out to 940MPa, percentage elongation A average out to 14%, contraction percentage of area Z average out to 40%, all indexs all require to exceed 20～55% than the technical standard of existing excellent carbon 70 steel, and particularly its percentage elongation A exceeds 55% than standard-required, is suitable for the cold drawing deep processing fully.
They are two years old, the present invention adopts controlled rolling and the cold new technology of three stages control to produce the high-carbon steel gren rod, cooling velocity by control high-carbon steel gren rod rolling laying temperature, after rolling is controlled sorbitic quantity and sheet interlayer spacing, not only the drawing property of gained steel and wire rod is good, and before drawing, do not need steel and wire rod is carried out normalized treatment, can significantly reduce production costs.
They are three years old, the present invention is easy to operate, be easy to control, with short production cycle, gained high-carbon steel gren rod sorbite quantity is many, the sorbite sheet interlayer spacing is little, mechanical property stable, be not easy brittle failure in process of production, more can adapt to extensive, requirement of mass production.
The specific embodiment
Be described in further detail below in conjunction with the production method of specific embodiment high-carbon steel gren rod of the present invention:
Excellent carbon 70 steel (the carbon weight content is 0.7% carbon constructional quality steel) gren rod with production Φ 5.5～14mm is an example, continuous casting square billet to 150mm * 150mm carries out controlled rolling and controlled cooling, 990～1080 ℃ austenite recrystallization district carry out roughing, in roll and pre-finish rolling, make its accumulative total percentage elongation n
1Reach 65～120 times, can make austenite crystal refine to 5～10 μ m.Every time will produce perfect recrystallization after rolling in this stage, by multi-pass deformation-austenite recrystallization repeatedly, thereby obtain evenly, the austenite crystal of refinement.If the temperature of breaking down open rolling is too high, i.e. the temperature height of steel billet heating will cause that austenite crystal is thick, the billet surface scaling loss increases.If temperature was low excessively when pre-finish rolling finished, then rolling drag increases, and the damage of milling train and roll is also big.
Carrying out pre-water-cooled processing after the pre-finish rolling mainly is the temperature of regulating rolled piece, makes rolled piece internal and external temperature homogenising, controls the temperature that rolled piece enters the finish rolling stage simultaneously, and the cooling velocity in this stage is controlled at 10～40 ℃/s.
The finish rolling start rolling temperature is 920 ℃～990 ℃, carries out 4～10 passage finish rolling, and its effect is that the austenite crystal of refinement is elongated, and intracrystalline forms deformation band, the core when these high-energy deformation bands will be as ferrite and the phase transformation of cementite forming core.Because mill speed is fast, every time decrement is big in addition, and these deformation bands are thin, provides the foundation for obtaining tiny sorbite sheet interlayer spacing tissue later on, and the temperature of rolled piece is risen.The finishing temperature of finish rolling is controlled at 920～1050 ℃, mainly is to be determined by the required intensity of gren rod, extensibility, toughness.Increase finish rolling deformation degree, reduce finishing temperature further refine austenite crystal grain, reduction ductile-brittle transition temperature, and improve dislocation density, the deformation energy storage is increased, cause the rising of sorbite nucleation rate.But temperature is low excessively, then will reduce the milling train life-span, increase the gren rod blemish.
Finish rolling finishes the back rolled piece is worn water acceleration cooling, cooling beginning temperature is set at 920～990 ℃, this moment rolled piece inner be the tiny austenite structure of fragmentation entirely, cool off the major control austenite crystal fast and no longer grow up, guarantee phase transformation after the sorbite crystallite dimension tiny.Excellent carbon 70 steel are between the high temperature recrystallization zone 910～960 ℃ of scopes, and the deformational stress that this moment, austenite crystal bore when rolling transfers interior reservoir to and becomes energy, and broken crystal grain crystallization and the driving force of growing up again is strong.The cooling velocity of 60～290 ℃/s can make the rolled piece internal energy discharge in a large number, reduces the austenite crystal crystallization and the driving force of growing up again, thereby obtains the tiny austenite of crystallite dimension.
The temperature that cooling is weaved silk after finishing is controlled at 830～890 ℃, makes the volume that looses.It is cold to involve in sector-style to loosing then, tiny austenite of this stage begins to carry out phase transformation, separates out sorbite, and the air-cooled speed of this moment influences the sorbite sheet interlayer spacing, it is optimum that air-cooled speed is controlled at the sorbite sheet interlayer spacing that 3～5 ℃/s obtains, in the scope of 100～180nm.If air-cooled speed is excessive, will obtain the hard phase constitution of partial martensite, influence the drawing property of rolled piece; If air-cooled speed is too little, the sorbite sheet interlayer spacing is thick, and also contains more ferritic structure, influences the mechanical property of rolled piece.Because this moment, the size of rolled piece was little, not only the air output of cooling blower can influence its cooling velocity, environment temperature also can exert an influence, so need control the air output of cooling blower according to changes of seasons, be about 60～85% of specified air output summer, be about 30～50% of specified air output winter, with the air-cooled velocity-stabilization of guaranteeing rolled piece scope at 3～5 ℃/s.Concrete production instance is described below:
Embodiment 1: the production method of the size hot-rolled wire rod of Φ 14mm
1) heating 150mm * 150mm continuous casting excellent carbon 70 steel billets, heating back are 1050 ℃ high temperature recrystallization zone open rolling, carry out roughing, in roll and pre-finish rolling, by 17 rolling mills rolling after, the diameter of rolled piece is that Φ 20.8mm, area are 339.8mm
2, accumulative total elongation n
1=66.2 times;
2) wear water cooling (pre-water-cooled) after pre-finish rolling finishes, to regulate the temperature on steel billet heart portion and surface, the cooling velocity of pre-water-cooled is controlled at 35.7 ℃/s, and be 1.3s cool time;
3) carry out 4 passage finish rolling, the finish rolling start rolling temperature is 925 ℃, and it is 930 ℃ (finishing temperatures) that finish rolling finishes its temperature of back, size (mm) and percentage elongation n after every time is rolling
2See Table 1;
4) after finish rolling finishes rolled piece is worn water and quicken cooling, beginning to cool down temperature is 930 ℃, and cooling velocity is controlled at 60 ℃/s, and the temperature that water-cooled is weaved silk after finishing is controlled at 870 ℃, and making looses rolls up;
5) volume that looses is carried out air-cooled processing again, by regulating the opening degree of cooling blower, making air output is 82% of rated capacity, cooling velocity is 4.8 ℃/s, and air-cooled roller table speed is 0.85m/s, and the air-cooled time is 99.6s, the collection volume temperature of loosing when rolling out air-cooled rod road is 390 ℃, and air cooling is to normal temperature.
Table 1:
(be the numbering of steel billet finishing pass in the first hurdle of table 1, b is that lateral dimension, the h of steel billet are the longitudinal size of steel billet in the inferior hurdle, n in the last hurdle
2Be every time percentage elongation of steel billet, below each the table in mark identical with table 1)
Embodiment 2: the production method of the size hot-rolled wire rod of Φ 5.5mm
1) heating 150mm continuous casting excellent carbon 70 billets, to 1072 ℃ of open rollings, carry out roughing, in roll, after the pre-finish rolling, the diameter of rolled piece is that Φ 16mm, area are 201.1mm
2, accumulative total elongation n
1=111.9 times;
2) wear water cooling (pre-water-cooled) after pre-finish rolling finishes, to regulate the temperature on steel billet heart portion and surface, the cooling velocity of pre-water-cooled is controlled at 30.1 ℃/s, and be 1.8s cool time;
3) carry out 10 passage finish rolling, the finish rolling start rolling temperature is 930 ℃, and the temperature after finish rolling finishes is 1010 ℃ (finishing temperatures), size (mm) and percentage elongation n after every time is rolling
2See Table 2;
4) after finish rolling finishes rolled piece is worn water and quicken cooling, beginning to cool down temperature is 1010 ℃, and cooling velocity is controlled at 330 ℃/s, and the temperature that water-cooled is weaved silk after finishing is controlled at 850 ℃, and making looses rolls up;
5) volume that looses is carried out air-cooled processing again, by regulating the opening degree of cooling blower, making air output is 42% of rated capacity, cooling velocity is 4.2 ℃/s, and air-cooled roller table speed is 0.75m/s, and the air-cooled time is 112.8s, the collection volume temperature of loosing when rolling out air-cooled rod road is 380 ℃, and air cooling is to normal temperature.
Table 2:
Embodiment 3: the production method of the size hot-rolled wire rod of Φ 8mm
1) heating 150mm continuous casting excellent carbon 70 billets, to 998 ℃ of open rollings, carry out roughing, in roll, after the pre-finish rolling, the diameter of rolled piece is that Φ 18.5mm, area are 268.6mm
2, accumulative total elongation n
1=83.7 times;
2) wear water cooling (pre-water-cooled) after pre-finish rolling finishes, to regulate the temperature on steel billet heart portion and surface, the cooling velocity of pre-water-cooled is controlled at 12.0 ℃/s, and be 1.7s cool time;
3) carry out 8 passage finish rolling, the finish rolling start rolling temperature is 950 ℃, and the temperature after finish rolling finishes is 982 ℃ (finishing temperatures), size (mm) and percentage elongation n after every time is rolling
2See Table 3;
4) after finish rolling finishes rolled piece is worn water and quicken cooling, beginning to cool down temperature is 982 ℃, and cooling velocity is controlled at 205 ℃/s, and the temperature that water-cooled is weaved silk after finishing is controlled at 832 ℃, and making looses rolls up;
5) volume that looses is carried out air-cooled processing again, by regulating the opening degree of cooling blower, making air output is 30% of rated capacity, cooling velocity is 3.7 ℃/s, and air-cooled roller table speed is 0.82m/s, and the air-cooled time is 103s, the collection volume temperature of loosing when rolling out air-cooled rod road is 450 ℃, and air cooling is to normal temperature.
Table 3:
Embodiment 4: the production method of the size hot-rolled wire rod of Φ 10mm
1) heating 150mm continuous casting excellent carbon 70 billets, to 1075 ℃ of open rollings, carry out roughing, in roll, after the pre-finish rolling, the diameter of rolled piece is that Φ 18.5mm, area are 268.6mm
2, accumulative total elongation n
1=83.7 times;
2) wear water cooling (pre-water-cooled) after pre-finish rolling finishes, to regulate steel billet heart portion and surface temperature, the cooling velocity that pre-water-cooled is handled is controlled at 45.8 ℃/s, and be 1.2s cool time;
3) carry out 6 passage finish rolling, the finish rolling start rolling temperature is 983 ℃, and the temperature after finish rolling finishes is 1031 ℃ (finishing temperatures), size (mm) and percentage elongation n after every time is rolling
2See Table 3;
4) after finish rolling finishes rolled piece is worn water and quicken cooling, beginning to cool down temperature is 1031 ℃, and cooling velocity is controlled at 230 ℃/s, and the temperature that water-cooled is weaved silk after finishing is controlled at 887 ℃, and making looses rolls up;
5) volume that looses is carried out air-cooled processing again, by regulating the opening degree of cooling blower, making air output is 50% of rated capacity, cooling velocity is 5.2 ℃/s, and air-cooled roller table speed is 0.80m/s, and the air-cooled time is 106s, the collection volume temperature of loosing when rolling out air-cooled rod road is 336 ℃, and air cooling is to normal temperature.
Table 4:
The Mechanics Performance Testing of the product of the present invention that obtains according to the experimental data of the foregoing description 1～4 the results are shown in Table 5:
Table 5:
From the result of table 5 as seen, the present invention is that controlled rolling and three sections processes that control is cold are adopted in the production and processing of the carbon constructional quality steel 70 steel gren rods of Φ 5.5～14mm to specification, the gren rod of producing has had significantly raising on mechanical property, all indexs all exceed 20～55% than existing technical standard, particularly its percentage elongation A exceeds 55% than current standard, confirms that the steel and wire rod that adopts the present invention to produce has good mechanical property.
Claims (8)
1. the production method of a good-quality high-carbon steel green rod for drawing in turn includes the following steps:
1) at first the high-carbon steel continuous casting steel billet is carried out heat temperature raising, and 970～1100 ℃ high temperature recrystallization zone carry out roughing, in roll and pre-finish rolling is handled, make the accumulative total percentage elongation n of rolled piece
1=65～120 times;
2) secondly rolled piece is carried out pre-water-cooled and handle, cooling velocity is controlled at 10～40 ℃/s, is controlled at 0.8～2.2s cool time;
3) finish rolling of then rolled piece being carried out 4～10 passages is handled, and the start rolling temperature of finish rolling is 900～990 ℃, every time percentage elongation n
2=1.1～1.3 times, the finishing temperature of finish rolling is controlled at 920～1090 ℃;
4) again rolled piece is carried out water-cooled and handle, begin to cool down temperature and be controlled at 920～1050 ℃, cooling velocity is controlled at 50～350 ℃/s, and the temperature that cooling is weaved silk after finishing is controlled at 830～900 ℃, makes the volume that looses;
5) involve in the sector-style cold treatment to loosing at last, air-cooled speed is controlled at 2～10 ℃/s, and the collection volume temperature that rolls out air-cooled roller-way of loosing is controlled at 330～450 ℃, places surrounding air to be cooled to normal temperature, can make good-quality high-carbon steel green rod for drawing.
2. the production method of good-quality high-carbon steel green rod for drawing according to claim 1, it is characterized in that: in the said step 1), 990～1080 ℃ high temperature recrystallization zones steel billet is carried out roughing, in roll and pre-finish rolling is handled, make the accumulative total percentage elongation n of rolled piece
1=70～110 times.
3. the production method of good-quality high-carbon steel green rod for drawing according to claim 1 is characterized in that: said step 2), rolled piece is carried out the cooling velocity that pre-water-cooled handles be controlled at 15～25 ℃/s, be controlled at 1.0～2.0s cool time.
4. the production method of good-quality high-carbon steel green rod for drawing according to claim 1 is characterized in that: in the said step 3), it is 925～990 ℃ that rolled piece is carried out the start rolling temperature that finish rolling handles, every time percentage elongation n
2=1.15～1.28 times, the finishing temperature of finish rolling is controlled at 930～1030 ℃.
5. the production method of good-quality high-carbon steel green rod for drawing according to claim 1, it is characterized in that: in the said step 4), the cooling velocity of rolled piece being carried out the water-cooled processing is controlled at 60～290 ℃/s, and the temperature that cooling is weaved silk after finishing is controlled at 830～890 ℃.
6. the production method of good-quality high-carbon steel green rod for drawing according to claim 1 is characterized in that: in the said step 5), the diffusing air-cooled speed that involves in the sector-style cold treatment is controlled at 3～8 ℃/s.
7. according to the production method of each described good-quality high-carbon steel green rod for drawing in the claim 1 to 6, it is characterized in that: in the said step 5), the air-cooled speed that involves in the sector-style cold treatment is controlled at 3～5 ℃/s to loosing.
8. the production method of good-quality high-carbon steel green rod for drawing according to claim 7 is characterized in that: in the said step 5), the diffusing air-cooled speed that involves in the sector-style cold treatment is controlled at 3～4 ℃/s.
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