CN101586182B - Method for reducing net level of bearing steel wire rod carbide - Google Patents
Method for reducing net level of bearing steel wire rod carbide Download PDFInfo
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- CN101586182B CN101586182B CN200910062664XA CN200910062664A CN101586182B CN 101586182 B CN101586182 B CN 101586182B CN 200910062664X A CN200910062664X A CN 200910062664XA CN 200910062664 A CN200910062664 A CN 200910062664A CN 101586182 B CN101586182 B CN 101586182B
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Abstract
The invention discloses a method for reducing net level of bearing steel wire rod carbide, including the following steps: firstly, bearing steel continuous casting billet is heated and warmed up, and rough rolling, medium rolling and pre-finishing treatments are carried out at the temperature of 1030 to 1130 DEG C, so that the accumulated elongation percentage n1 of rolled pieces is 65 to 120 times; secondly, pre-hydrocooling treatment of rolled pieces is carried out, the cooling speed is controlled in the range of 10 to 40 DEG C per second, and the cooling time is controlled in the range of 0.8 to 2.2 seconds; then 4 to 10 sub-finishing treatments of rolled pieces are carried out, the start-rolling temperature is controlled in the range of 900 to 950 DEG C, and the final-rolling temperature is controlled in the range of 920 to 990 DEG C; then the rolled pieces are in hydrocooling treatment, the cooling speed is controlled in the range of 50 to 350 DEG C per second, the spinning temperature is controlled in the range of 760 to 820 DEG C, and dispersed rolls are manufactured; finally, the dispersed rolls are in air-cooled treatment, the air-cooled speed is controlled in the range of2 to 10 DEG C per second, the roll collection temperature when the dispersed rolls come out of air-cooled roller way is controlled in the range of 330 to 450 DEG C, and the dispersed rolls are disposed in environmental air and cooled till room temperature. The products produced by using the method have 95% of carbide whose net level is less than or equal to 1.0 in which the average level is 0.95,thereby being capable of increasing abrasion resistance and service life of steel.
Description
Technical field
The invention belongs to the process for processing field of steel and wire rod, refer to a kind of method that reduces net level of bearing steel wire rod carbide particularly.
Background technology
The high-carbon-chromium bearing steel wire rod mainly is the material that is used to make bearing roller, the tissue of high-carbon-chromium bearing steel is the superfluous carbide that distributing on martensitic matrix, this is because the carbon content height in the high-carbon-chromium bearing steel, and also contain a certain amount of chromium, a large amount of eutectic carbidess is arranged in the strand, these carbide are when steel billet heats, most of melt back is in austenite, but there is minor amount of carbide not molten, and molten part is separated out when rolling or when rolling postcooling once more, forms carbide liquation, carbide strip, carbide network tissue.Bearing in use can reduce its wear resistance because of peeling off of epidermis carbide, can strengthen crack sensitivity because of inner carbide particle, can reduce fatigue lifetime because of the generation expansion of fatigue cracking.Carbide network is to separate out along the austenite crystal border to be the superfluous proeutectoid carbide that network distributes in steel.In the actual production, the bearing steel billet though can reduce the carbide network rank, is difficult to eliminate fully carbide network in the steel by heating, rolling and cooling.So National Standard high-carbon-chromium bearing steel " to stipulate among the GB/T18254-2002: bearing steel wire rod carbide is netted≤and 2.5 grades.
Before the present invention, the method that obtains control high-carbon-chromium bearing steel wire rod carbide has the Chinese invention patent of Jinniu Co., Ltd., Dalian, its application number is: 01113948.X, the applying date is May 9 calendar year 2001, and denomination of invention is " directly drawing high-carbon-chromium bearing steel wire rod and a manufacture method "; And the patent of Korea S Pohang Iron and Steel Corporation: Korea.No.KR100340542B, the applying date is May 31 in 2002 " METHOD FOR PRODUCING BEARING STEEL ROD WIRE FORBALL HAVING EXCELLENT FATIGUE LIFE ", preceding a kind of manufacture method is mainly reflected in: change the GCr15 composition proportion, by controlled rolling, the controlled chilling novel process, make the hot rolling bearing steel wire rod roll the back and obtain crystal grain thinning, equally distributed fine pearlite and sorbite tissue, wire rod rolls back tensile strength sigma b=1250～1500MPa, relative reduction in area (ψ) 20～35%, 1.0 grades～2.0 grades of carbide networks, the work-ing life that can improve the manufacturing rolling body.The production method that a kind of processing method in back provides and a kind ofly adopts little billet rolling, has excellent fatigue characteristic, dwindles the chromium carbide size, high rigidity is used for the rolling body bearing steel wire rod comprises the processing parameter of heating, rolling, cooling, anneal.
Though above-mentioned two kinds of methods can be controlled bearing steel carbide rank to a certain extent, their weak point be its product carbide network rank still can only maintain 〉=1.0 grades, make the wear resistance of bearing steel and work-ing life can not obtain fine optimization.Control carbide network rank how during to the high-carbon-chromium bearing steel rod rolling of routine is guaranteed in the wire rod of industrialized mass carbide network≤1.0 grade, is that the iron and steel scientific research personnel is making great efforts the difficult problem explored up to now always.
Summary of the invention
Purpose of the present invention is exactly that a kind of method that reduces net level of bearing steel wire rod carbide will be provided, to increase the wear resistance and the work-ing life of steel.
For achieving the above object, the present invention adopts the novel process of " three sections controls of finish rolling are cold ", promptly by in the finish rolling process, adopting pre-water-cooled, water-cooled and measure such as air-cooled, make rolled piece in the differing temps section with different speed coolings, control carbide network rank in the wire rod.
Its concrete technology in turn includes the following steps:
1) at first, the bearing steel continuous casting steel billet is carried out heat temperature raising, 1030～1130 ℃ of high temperature recrystallization zones carry out roughing, in roll and pre-finish rolling is handled, make the accumulative total unit elongation n of rolled piece
1=65～120 times;
2) secondly, rolled piece is carried out pre-water-cooled handle, speed of cooling is controlled at 10～40 ℃/s, is controlled at 0.8～2.2s cooling time;
3) then, rolled piece is carried out the finish rolling of 4～10 passages and handle, the start rolling temperature of finish rolling is controlled at 900～950 ℃, and the finishing temperature of finish rolling is controlled at 920～990 ℃;
4) again rolled piece is carried out water-cooled and handle, begin to cool down temperature and be controlled at 920～990 ℃, speed of cooling is controlled at 50～350 ℃/s, and the temperature that cooling is weaved silk after finishing is controlled at 760～820 ℃, makes the volume that looses again;
5) involve in the sector-style deepfreeze to loosing at last, air-cooled speed control is at 2～10 ℃/s, and the collection volume temperature that rolls out air-cooled roller-way of loosing is controlled at 330～450 ℃, places ambient air to be cooled to normal temperature, can make the low bearing carbon steel gren rod of carbide network rank.
As improvement project of the present invention, in step 2) in, speed of cooling is controlled at 15～25 ℃/s, is controlled at 1.0～2.0s cooling time.
As a further improvement on the present invention, in the step 4) rolled piece is carried out the speed of cooling of water-cooled when handling at 60～290 ℃/s
Further, in the step 4) rolled piece is carried out water-cooled when handling, the wire rod temperature that cooling finishes to control the temperature of weaving silk: diameter of phi＜9.5mm respectively by wire rod diameter difference in the back is controlled at 780～820 ℃; The wire rod temperature of diameter of phi 〉=9.5mm is controlled at 760～810 ℃.
As improvement project more of the present invention, the air-cooled speed control when involving in the sector-style deepfreeze to loosing in step 5) better can be controlled at 4～6 ℃ at 3～8 ℃/s.
In the operation steps of the present invention, to the bearing steel rolled piece before finish rolling after pre-water-cooled, the finish rolling water-cooled and the air-cooled control of volume of loosing be key of the present invention, the present invention is as follows to the mechanism of action of preparation technology parameter control: first, pre-water-cooled before the finish rolling has been regulated the inner and surperficial temperature of rolled piece, controls the temperature that rolled piece advances finishing train simultaneously.The second, the water-cooled after the finish rolling is cooled off fast to austenite, but the refine austenite grain fineness number has simultaneously also stoped original carbide and the cementite gathering of having separated out is grown up, refinement the carbide particle size.The 3rd, water-cooled after the finish rolling can be accelerated the transformation rate of austenite to perlite, cementite structural transformation, and the cementite even dispersion that major part is separated out is distributed in the pearlite matrix, significantly reduces cementite and separates out at austenite grain boundary, promptly reduces carbide network quantity.The 4th, involve in the sector-style deepfreeze to loosing, suppressed the coarsening rate of perlite, cementite crystal grain after the phase transformation, reduced the carbide network rank.Utilize method of the present invention, can control the rolled piece speed of cooling of differing temps section in process of production, thereby carbide refinement and even dispersion are distributed in the matrix, have reduced the carbide rank, can strengthen the wear resistance of bearing and prolong its work-ing life.Can control carbide network rank in the steel in the process of utilizing the inventive method to produce, by the National Standard high-carbon-chromium bearing steel " GB/T 18254-2002 judges, 90% bearing steel wire rod carbide is netted≤and 1.0 grades.The present invention simultaneously is easy to operate, be easy to control, can adapt on a large scale, requirement of mass production.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail:
Embodiment 1: the method for the size hot-rolled wire rod of production diameter of phi 14mm
1) heating 150mm * 150mm continuous casting high-carbon-chromium bearing steel base, 1130 ℃ 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 speed of cooling of pre-water-cooled is controlled at 25 ℃/s, and be 2.0s cooling time;
3) carry out 4 passage finish rolling and handle, the finish rolling start rolling temperature is 950 ℃, and it is 990 ℃ (finishing temperatures) that finish rolling finishes its temperature of back;
4) after finish rolling finishes rolled piece is worn water and quicken cooling, beginning to cool down temperature is 990 ℃, and speed of cooling is controlled at 60 ℃/s, and the temperature that water-cooled is weaved silk after finishing is controlled at 810 ℃, 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 72% of specified rate, speed of cooling is 6 ℃/s, and air-cooled roller table speed is 0.85m/s, and the air-cooled time is 91.6s, the collection volume temperature of loosing when rolling out air-cooled rod road is 330 ℃, and air cooling is to normal temperature.
Embodiment 2: the method for the size hot-rolled wire rod of production diameter of phi 5.5mm
1) heating 150mm * 150mm continuous-casting bearing steel square billet, to 1030 ℃ 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 speed of cooling of pre-water-cooled is controlled at 15 ℃/s, and be 2.2s cooling time;
3) carry out 10 passage finish rolling, the finish rolling start rolling temperature is 900 ℃, and the temperature after finish rolling finishes is 920 ℃ (finishing temperatures);
4) after finish rolling finishes rolled piece is worn water and quicken cooling, beginning to cool down temperature is 920 ℃, and speed of cooling is controlled at 290 ℃/s, and the temperature that water-cooled is weaved silk after finishing is controlled at 780 ℃, 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 specified rate, speed of cooling is 4 ℃/s, and air-cooled roller table speed is 0.74m/s, and the air-cooled time is 114.3s, the collection volume temperature of loosing when rolling out air-cooled rod road is 350 ℃, and air cooling is to normal temperature.
Embodiment 3: the method for the size hot-rolled wire rod of production diameter of phi 8mm
1) heating 150mm * 150mm continuous-casting bearing steel square billet, to 1092 ℃ 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 speed of cooling of pre-water-cooled is controlled at 40 ℃/s, and be 0.8s cooling time;
3) carry out 8 passage finish rolling, the finish rolling start rolling temperature is 940 ℃, and the temperature after finish rolling finishes is 950 ℃ (finishing temperatures);
4) after finish rolling finishes rolled piece is worn water and quicken cooling, beginning to cool down temperature is 950 ℃, and speed of cooling is controlled at 300 ℃/s, and the temperature that water-cooled is weaved silk after finishing is controlled at 780 ℃, 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 60% of specified rate, speed of cooling is 8 ℃/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 350 ℃, and air cooling is to normal temperature.
Embodiment 4: the method for the size hot-rolled wire rod of production diameter of phi 10mm
1) heating 150mm * 150mm continuous-casting bearing steel square billet, to 1095 ℃ 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=85.3 times;
2) wear water cooling (pre-water-cooled) after pre-finish rolling finishes, to regulate steel billet heart portion and surface temperature, the speed of cooling that pre-water-cooled is handled is controlled at 25 ℃/s, and be 1.0s cooling time;
3) carry out 6 passage finish rolling, the finish rolling start rolling temperature is 933 ℃, and the temperature after finish rolling finishes is 941 ℃ (finishing temperatures);
4) after finish rolling finishes rolled piece is worn water and quicken cooling, beginning to cool down temperature is 941 ℃, and speed of cooling is controlled at 230 ℃/s, and the temperature that water-cooled is weaved silk after finishing is controlled at 810 ℃, 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 specified rate, speed of cooling is 4.6 ℃/s, and air-cooled roller table speed is 0.80m/s, and the air-cooled time is 103s, the collection volume temperature of loosing when rolling out air-cooled rod road is 336 ℃, and air cooling is to normal temperature.
When the product that the inventive method is made carries out quality examination, the product of above-mentioned four embodiment is respectively got 5 groups of samples carry out performances such as carbide network rank, drawing effect respectively and test, the quality test results of acquisition sees Table 1:
The quality product test result of table 1: embodiment 1～4
From table 1 result as seen, adopting the specification of " three sections controls of finish rolling are cold " of the present invention processing method process for processing is the high carbon chromium bearing steel hot rolling wire rod of Φ 5.5～14mm, one group of sample is only arranged is 1.5 grades to the carbide network rank of product in 20 groups of samples, the carbide network of all the other products≤1.0 grade, requiring carbide network≤2.5 grade standards to have significantly than existing GB (GB/T 18254-2002) reduces, confirmed to adopt the carbide network rank of the bearing steel wire rod that the present invention produces to be controlled at≤1.0 grades, thereby can strengthen the wear resistance of bearing and prolong its in work-ing life.
Claims (6)
1. method that reduces net level of bearing steel wire rod carbide, it is characterized in that: this method in turn includes the following steps:
1) at first the bearing steel continuous casting steel billet is carried out heat temperature raising, under 1030～1130 ℃ temperature, carry out roughing, in roll and pre-finish rolling is handled, make the accumulative total unit elongation n of rolled piece
1=65～120 times;
2) secondly rolled piece is carried out pre-water-cooled and handle, speed of cooling is controlled at 10～40 ℃/s, is controlled at 0.8～2.2s cooling time;
3) then rolled piece is carried out 4～10 passage finish rolling and handle, start rolling temperature is controlled at 900～950 ℃, and finishing temperature is controlled at 920～990 ℃;
4) again rolled piece is carried out water-cooled and handle, speed of cooling is controlled at 50～350 ℃/s; To the wire rod of diameter Ф＜9.5mm, its laying temperature is controlled at 780～820 ℃; To the wire rod of diameter Ф 〉=9.5mm, its laying temperature is controlled at 760～810 ℃; Make the volume that looses after weaving silk;
5) involve in the sector-style deepfreeze to loosing at last, air-cooled speed control is at 2～10 ℃/s, and the collection volume temperature that rolls out air-cooled roller-way of loosing is controlled at 330～450 ℃, places ambient air to be cooled to normal temperature.
2. the method for reduction net level of bearing steel wire rod carbide according to claim 1 is characterized in that: said step 2), speed of cooling is controlled at 15～25 ℃/s, is controlled at 1.0～2.0s cooling time.
3. the method for reduction net level of bearing steel wire rod carbide according to claim 1 and 2 is characterized in that: in the said step 4), speed of cooling is controlled at 60～290 ℃/s.
4. the method for reduction net level of bearing steel wire rod carbide according to claim 1 and 2 is characterized in that: in the said step 5), air-cooled speed control is at 3～8 ℃/s.
5. the method for reduction net level of bearing steel wire rod carbide according to claim 3 is characterized in that: in the said step 5), air-cooled speed control is at 3～8 ℃/s.
6. the method for reduction net level of bearing steel wire rod carbide according to claim 5 is characterized in that: in the said step 5), air-cooled speed control is at 4～6 ℃/s.
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| CN200910062664XA CN101586182B (en) | 2009-06-16 | 2009-06-16 | Method for reducing net level of bearing steel wire rod carbide |
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| CN106623415A (en) * | 2016-11-28 | 2017-05-10 | 邢台钢铁有限责任公司 | Rolling method of 0Cr17 stainless steel disc strip |
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