CN103173681A - Cold rolled steel working roll using SKD-11 steel and production process thereof - Google Patents
Cold rolled steel working roll using SKD-11 steel and production process thereof Download PDFInfo
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Abstract
The invention discloses a cold rolled steel working roll using an SKD-11 steel. The steel contains C, Si, Mn, Cr, Mo, Ni, V, Cu, P, S, Fe and irremovable impurities. The steel is produced into the cold rolled steel working roll through the following process, and the process comprises the following steps: conducting electroslag remelting on the SKD-11 steel, forging the steel into the working roll, spheroidizing and annealing the working roll to perform the first quenching treatment, conducting high tempering on the treated working roll to perform the second quenching treatment, lifting the working roll into an intermediate frequency multi-turn electric heating device, adjusting the current frequency and the heating time of the multi-turn electric heating device to control the heating depth to 30mm, and finally performing the medium tempering of the working roll treated by the second quenching treatment for three times. The working roll has the features of low cost, easy processing, higher wear resistance, bending resistance, hardenability, tempering resistance, and accident resistance.
Description
Technical field
The present invention relates to a kind of roll, be specifically related to a kind of cold-rolled steel working roll and production technique thereof with the SKD-11 steel.
Background technology
The cold-rolling process of steel starts from Germany in the middle of the 19th century, can only produce at that time soft steel 20 ~ 25mm arrowband, and the U.S. successfully rolls out wide steel strip for the first time as far back as nineteen twenty.Nineteen twenty-four, the Armco Steel Corp.'s Butler (Bulter) in the U.S. built up first set three frame four roller tandem cold-mills in the world, and the U.S. builds five frame tandem cold-mills since the fifties in last century.For rolling thinner zinc-plated former, the beginning of the sixties in last century, pause plate pipe company of U.S. Yang Si built up first set six Stands Cold Tandem Mills in the world.The process associating fully continuous line (FIPL) of nippon Guang field factory, the ， Guang field factory output after the FIPL line is gone into operation that went into operation in 1986 is increased sharply, and the rate of utilization of work hour is up to 95%, and recovery rate increases to 96.9%, and energy consumption descends 40%.The FIPL of this factory realizes completely continuous manufacturing with pickling-cold rolling-continuous annealing and finishing first in the whole world.
The production of China's cold-rolled wide strip steel starts from nineteen sixty, model 1700mm single stand reversible cold-rolling mill, the 1200mm single stand reversible cold-rolling mill of having gone into operation successively later on, MKW MKW mill, 1150mm Sendzimir Sendzimir mill.China first set 1700mm five frame cold-rolling mills of having gone into operation the seventies in last century built up 2030mm five frame cold tandem mills in 1988.The cold continuous rolling development has had the new technologies such as full continuous cold rolling, fast roll changing, hydraulic pressing, roll bending system and automatic control so far.High precision cold belt and plate shape control techniques and computer Whole Process Control technology are used widely, and roll speed is up to 35-41.6m/s, and maximum volume-weight reaches 60t.
Modern industry is more and more high to the specification of quality of cold rolled sheet steel, and is more and more extensive to the kind requirement, also more and more large to the output requirement, thereby the production increase of cold rolled sheet is very fast.The output of cold rolled sheet has accounted for 30% left and right of steel ultimate production in industrially developed country.Reach more than 100,000,000 tons from China in 1996 steel annual production, always surely according to World Steel output first.Reached 24529.3 ten thousand tons to November China output of steel in 2004 according to statistics, estimate that annual output of steel reaches more than 2.7 hundred million tons, its total amount has reached the nearly 30% of the total steel output in the whole world, but at rolling shapes with also have certain gap with developed countries qualitatively.7,600,000 tons of cold rolled sheets of China's import in front 11 months, 559.8 ten thousand tons of Coated Steel Sheets, 151.8 ten thousand tons of electrical sheets.And the outlet of the same period is less, illustrates that domestic cold rolled strip still is in the state that supply falls short of demand, and domestic breach is larger.
Cold roll (hereinafter to be referred as cold roll) is the main consumable part of cold-rolling mill, and the quality of its quality plays very important effect to quality, cost, the output of cold rolled sheet.Therefore, cold rolling mill and roll factory all spare no effort to improve the use properties of roll.These performances comprise intensity, hardness, toughness, wear resistance and anti-accident performance etc.Along with modern cold-rolling mill maximizes, the development of high speed, cold roll is to change to high quality steel with steel from traditional chromium steel, and the performance of cold roll has increased significantly, and steel grade and manufacture method also present the trend of diversification.
SKD11 is the Japanese tool steel trade mark, and there are production in Hitachi and Datong District steel mill, and Hitachi produces SKD11 commodity SLD (up-to-date improvement version is called SLD-MAGIC) by name, and Datong District steel mill commodity are called DC11.Both all set up factories in the continent, and in the industry cycle well-known, price is also the highest.This steel is a kind of air cooling sclerosis cold-work die steel in international widespread use.Through electrosmelting and through electroslag remelting, high cleanliness, toughness is better, homogeneous microstructure, have good hot strength, toughness and high temperature resistance fatigue property, the cataclysm of energy withstand temp, SKD11 is that the logical cold-work die steel of wear-resisting toughness, carbon Chrome metal powder tool steel and vacuum are taken off refining steel, steel is pure, has that hardening capacity is good, well the quenching property of the deflection of quenching.This steel moves back softening the processing through nodularization, and additivity is good, and carbide particle is carefully even, and palpus is carried on a shoulder pole the cracking strengthening element molybdenum of quenching, holding very of vanadium adds.Hardness, wear-resisting eutectic carbides are even, and toughness is not easy to crack, the rear hardness of quenching〉62HRC.At 525 ℃ of nitriding treatment, the time is 20h/30h/60h, ammonification layer depth 0.25mm/0.30mm/0.35mm, part table hardness 1250HV; Be 2h 570 ℃ of nitriding treatment times; Nitride layer depth 10 ~ 20 μ m, part table hardness 950HV.If but these steel are used for cold roll when using, its performance can't satisfy the needs of use.
Because the south east asia belt steel rolling is scarcely out of swaddling-clothes, the environment for use very severe, the torrid zone becomes band at Direct Rolling under the condition of pickling, makes the construction work welded tube.Product requirement is not high, mainly devotes exclusive attention to output.Commonly use at present material with cold roll commonly used and be difficult to satisfy production requirement, big area often occurs and come off and quick-fried roller, roll breakage, and price is higher.Requirement for south east asia belt steel rolling client, by the cold-work die steel material is adopted the improvement of SKD-11 chemical composition and the change of heat treatment mode, seek a kind of service requirements technical scheme that can satisfy the cold-rolled steel working roll fully, having become those skilled in the art has technical problem to be solved.
Summary of the invention
The object of the invention is to overcome the defective that exists in prior art, provide a kind of cost lower, be convenient to processing, have cold-rolled steel working roll and the production technique thereof with the SKD-11 steel of higher wear resistance, flex resistance, hardening capacity, temper resistance and anti-accident.
For achieving the above object, technical scheme of the present invention is a kind of cold-rolled steel working roll with the SKD-11 steel of design, it is characterized in that, the chemical composition that contains in described SKD-11 steel be respectively by weight percentage 1.40% ~ 1.60% C ,≤0.60% Si ,≤0.80% Mn, 12.00% ~ 14.00% Cr, 0.80% ~ 1.30% Mo ,≤0.80% Ni, 0.20% ~ 0.50% V ,≤0.25% Cu ,≤0.020% P and≤0.030% S, all the other are Fe and the impurity that can not remove.
Wherein preferred technical scheme is that in described chemical composition, the mass ratio of Si and Mn is 1:1 ~ 1:1.15
Preferred technical scheme also has, also contain in described SKD-11 steel≤oxygen of 15ppm and≤hydrogen of 1.5ppm.
For achieving the above object, another technical scheme of the present invention is the production technique of the cold-rolled steel working roll of a kind of above-mentioned SKD-11 of using steel of design, it is characterized in that, described production technique comprises:
S1: the SKD-11 steel of mentioned component proportioning are carried out esr, then be forged into working roll spare;
S2: working roll spare is carried out Spheroidizing Annealing process;
S3: quench treatment for the first time, the working roll spare after Spheroidizing Annealing is processed is put into electric furnace and is heated to 1040 degree, then adopts oil quenchinng cooling;
S4: the working roll spare of quench treatment carries out the high tempering processing for the first time;
S5: quench treatment for the second time, in working roll spare device for hoisting intermediate frequency multi-turn electric heater unit, by adjusting power frequency and the heat-up time of multi-turn electric heater unit, reach and control heat penetration to 30 ~ 50mm, and make body of roll temperature reach 1050 spend and be incubated after, then working roll spare is put into oil sump cooling fast;
S6: the working roll spare of quench treatment carries out 3 average temperings processing more for the second time.
Wherein preferred technical scheme is, spheroidal annealing process in described S2 comprises that working roll spare being heated to 450 ± 10 degree in electric furnace is incubated 1 hour, and then working roll spare is heated to 650 ± 10 degree insulation 2 hours, again working roll spare is heated to 840 ± 10 insulation 4 ~ 6 hours, and then with per hour 30 the degree speed of cooling with furnace temperature be cooled to 770 ± 10 the insulation 6 ~ 8 hours, and then with per hour 30 the degree speed of cooling with furnace temperature be cooled to 540 the degree below come out of the stove.
Preferred technical scheme also has, and it is working roll spare to be heated to 500 ~ 600 degree in electric furnace that the high tempering in described S4 is processed, then use 20 ~ 36 hours cooling.
Preferred technical scheme also has, and it is working roll spare to be heated to 350 ~ 500 degree in electric furnace that 3 average temperings in described S6 are processed at every turn, then use 10 ~ 15 hours cooling.
Preferred technical scheme also has, and in the heat-processed of the working roll spare in described S5 in intermediate frequency multi-turn electric heater unit, adopts the surface temperature of the double-colored temperature-measuring gun one-point measurement of infrared rays working roll spare.
Preferred technical scheme also has, and the control heat penetration in described S5 is 30mm.
Advantage of the present invention and beneficial effect are: the cold-rolled steel working roll that adopts these SKD-11 steel and complete processing thereof to make, after the improvement to the adjustment of its chemical composition and thermal treatment process, its performance can satisfy the use needs of cold-rolled steel working roll fully, and its cost has had obvious reduction than manufacturing cost and the use cost of existing cold-rolled steel working roll, this roll has that just surface hardness is high, wear resisting property is good, have higher stability, obdurability, cracking resistance line sprouting ability, and also have very high resistance to crack extension ability.This cold-rolled steel working roll finally quenches by induction diathermic formula differential quenching device.According to the height of frequency and the control of heat-up time, roll surface is carried out surface heating.Spray water by Quench more cooling.The product surface hardness that obtains is high, distortion is little, and surface structure crystal grain is tiny, and notch sensitivity is little, and the wear resistance of its working roll is improved greatly.The depth of hardening zone of this cold-rolled steel working roll can and effectively be controlled according to frequency and reach 30mm heat-up time.The quench-hardened case gradient of this cold-rolled steel working roll is mild, is similar to the integral quenching gradient.This cold-rolled steel working roll rate of heating in quenching technology is fast, and thermosteresis is few, and is pollution-free, energy-conservation.Due to this cold-rolled steel working roll deflection, can effectively reduce raw-material cost and metalworking cost.Adopt the complete processing of this cold-rolled steel working roll to have shortened the process-cycle.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
Embodiment 1
The present invention is a kind of cold-rolled steel working roll with the SKD-11 steel, the chemical composition that contains in described SKD-11 steel be respectively by weight percentage 1.40% C, 0.60% Si, 0.80% Mn, 12.00% Cr, 0.80% Mo, 0.80% Ni, 0.20% V, 0.25% Cu ,≤0.020% P and≤0.030% S, all the other are Fe and the impurity that can not remove.
Preferred embodiment also has, also contain in the SKD-11 steel≤oxygen of 15ppm and≤hydrogen of 1.5ppm.
The present invention also designs a kind of production technique of cold-rolled steel working roll of the SKD-11 of using steel, and this production technique comprises:
The first step: the SKD-11 steel of mentioned component proportioning are carried out esr, then be forged into working roll spare;
Second step: working roll spare is carried out Spheroidizing Annealing process;
The 3rd step: quench treatment for the first time, the working roll spare after Spheroidizing Annealing is processed is put into electric furnace and is heated to 1040 degree, then adopts oil quenchinng cooling;
The 4th step: the working roll spare of quench treatment carries out the high tempering processing for the first time;
The 5th step: quench treatment for the second time, in working roll spare device for hoisting intermediate frequency multi-turn electric heater unit, by adjusting power frequency and the heat-up time of multi-turn electric heater unit, reach and control heat penetration to 30 ~ 50mm, and make body of roll temperature reach 1050 spend and be incubated after, then working roll spare is put into oil sump cooling fast;
The 6th step: the working roll spare of quench treatment carries out 3 average temperings processing more for the second time.
Wherein preferred embodiment is, spheroidal annealing process in described S2 comprises that working roll spare being heated to 450 ± 10 degree in electric furnace is incubated 1 hour, and then working roll spare is heated to 650 ± 10 degree insulation 2 hours, again working roll spare is heated to 840 ± 10 insulation 4 hours, and then with per hour 30 the degree speed of cooling with furnace temperature be cooled to 770 ± 10 the insulation 6 hours, and then with per hour 30 the degree speed of cooling with furnace temperature be cooled to 540 the degree below come out of the stove.
Preferred embodiment also has, and it is working roll spare to be heated to 500 degree in electric furnace that the high tempering in described S4 is processed, then use 20 hours cooling.
Preferred embodiment also has, and it is working roll spare to be heated to 350 degree in electric furnace that 3 average temperings in the 6th step are processed at every turn, then use 10 hours cooling.
Preferred embodiment also has, and in the heat-processed of working roll spare in intermediate frequency multi-turn electric heater unit in the 5th step, adopts the surface temperature of the double-colored temperature-measuring gun one-point measurement of infrared rays working roll spare.
Preferred embodiment also has, and the control heat penetration in the 5th step is 30mm.
Embodiment 2
A kind of cold-rolled steel working roll with the SKD-11 steel, the chemical composition that contains in the SKD-11 steel be respectively by weight percentage 1.60% C, 0.80% Si ,≤1.0% Mn, 14.00% Cr, 1.30% Mo ,≤1.20% Ni, 0.50% V, 0.30% Cu ,≤0.020% P and≤0.030% S, all the other are Fe and the impurity that can not remove.
Preferred embodiment also has, also contain in the SKD-11 steel≤oxygen of 15ppm and≤hydrogen of 1.5ppm.
The present invention also designs a kind of production technique of cold-rolled steel working roll of the SKD-11 of using steel, and this production technique comprises:
The first step: the SKD-11 steel of mentioned component proportioning are carried out esr, then be forged into working roll spare;
Second step: working roll spare is carried out Spheroidizing Annealing process;
The 3rd step: quench treatment for the first time, the working roll spare after Spheroidizing Annealing is processed is put into electric furnace and is heated to 1040 degree, then adopts oil quenchinng cooling;
The 4th step: the working roll spare of quench treatment carries out the high tempering processing for the first time;
The 5th step: quench treatment for the second time, in working roll spare device for hoisting intermediate frequency multi-turn electric heater unit, by adjusting power frequency and the heat-up time of multi-turn electric heater unit, reach and control heat penetration to 30 ~ 50mm, and make body of roll temperature reach 1050 spend and be incubated after, then working roll spare is put into oil sump cooling fast;
The 6th step: the working roll spare of quench treatment carries out 3 average temperings processing more for the second time.
Wherein preferred technical scheme is, spheroidal annealing process in described S2 comprises that working roll spare being heated to 450 ± 10 degree in electric furnace is incubated 1 hour, and then working roll spare is heated to 650 ± 10 degree insulation 2 hours, again working roll spare is heated to 840 ± 10 insulation 4 ~ 6 hours, and then with per hour 30 the degree speed of cooling with furnace temperature be cooled to 770 ± 10 the insulation 6 ~ 8 hours, and then with per hour 30 the degree speed of cooling with furnace temperature be cooled to 540 the degree below come out of the stove.
Preferred embodiment also has, and it is working roll spare to be heated to 600 degree in electric furnace that the high tempering in the 4th step is processed, then use 36 hours cooling.
Preferred embodiment also has, and it is working roll spare to be heated to 500 degree in electric furnace that 3 average temperings in the 6th step are processed at every turn, then use 15 hours cooling.
Preferred embodiment also has, and in the heat-processed of working roll spare in intermediate frequency multi-turn electric heater unit in the 5th step, adopts the surface temperature of the double-colored temperature-measuring gun one-point measurement of infrared rays working roll spare.
Preferred embodiment also has, and the control heat penetration in the 5th step is 30mm.
Embodiment 3
A kind of cold-rolled steel working roll with the SKD-11 steel, the chemical composition that contains in the SKD-11 steel be respectively by weight percentage 1.50% C, 0.70% Si, 0.90% Mn, 13.00% Cr, 1.10% Mo ,≤0.90% Ni, 0.30% V, 0.30% Cu ,≤0.020% P and≤0.030% S, all the other are Fe and the impurity that can not remove.
Preferred embodiment also has, also contain in the SKD-11 steel≤oxygen of 15ppm and≤hydrogen of 1.5ppm.
The present invention also designs a kind of production technique of cold-rolled steel working roll of the above-mentioned SKD-11 of using steel, and this production technique comprises:
The first step: the SKD-11 steel of mentioned component proportioning are carried out esr, then be forged into working roll spare;
Second step: working roll spare is carried out Spheroidizing Annealing process;
The 3rd step: quench treatment for the first time, the working roll spare after Spheroidizing Annealing is processed is put into electric furnace and is heated to 1040 degree, then adopts oil quenchinng cooling;
The 4th step: the working roll spare of quench treatment carries out the high tempering processing for the first time;
The 5th step: quench treatment for the second time, in working roll spare device for hoisting intermediate frequency multi-turn electric heater unit, by adjusting power frequency and the heat-up time of multi-turn electric heater unit, reach and control heat penetration to 40mm, and make body of roll temperature reach 1050 spend and be incubated after, then working roll spare is put into oil sump cooling fast;
The 6th step: the working roll spare of quench treatment carries out 3 average temperings processing more for the second time.
Wherein preferred technical scheme is, spheroidal annealing process in described S2 comprises that working roll spare being heated to 450 ± 10 degree in electric furnace is incubated 1 hour, and then working roll spare is heated to 650 ± 10 degree insulation 2 hours, again working roll spare is heated to 840 ± 10 insulation 5 hours, and then with per hour 30 the degree speed of cooling with furnace temperature be cooled to 770 ± 10 the insulation 7 hours, and then with per hour 30 the degree speed of cooling with furnace temperature be cooled to 540 the degree below come out of the stove.
Preferred embodiment also has, and it is working roll spare to be heated to 550 degree in electric furnace that the high tempering in the 4th step is processed, then use 28 hours cooling.
Preferred embodiment also has, and it is working roll spare to be heated to 400 degree in electric furnace that 3 average temperings in the 6th step are processed at every turn, then use 13 hours cooling.
Preferred embodiment also has, and in the heat-processed of working roll spare in intermediate frequency multi-turn electric heater unit in the 5th step, adopts the surface temperature of the double-colored temperature-measuring gun one-point measurement of infrared rays working roll spare.
Preferred embodiment also has, and the control heat penetration in the 5th step is 30mm.
The above is only the preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. cold-rolled steel working roll with the SKD-11 steel, it is characterized in that, the chemical composition that contains in described SKD-11 steel be respectively by weight percentage 1.40% ~ 1.60% C ,≤0.60% Si ,≤0.80% Mn, 12.00% ~ 14.00% Cr, 0.80% ~ 1.30% Mo ,≤0.80% Ni, 0.20% ~ 0.50% V ,≤0.25% Cu ,≤0.020% P and≤0.030% S, all the other are Fe and the impurity that can not remove.
2. the cold-rolled steel working roll with the SKD-11 steel as claimed in claim 1, is characterized in that, in described chemical composition, the mass ratio of Si and Mn is 1:1 ~ 1:1.15.
3. the cold-rolled steel working roll with SKD-11 steel as claimed in claim 1, is characterized in that, also contain in described SKD-11 steel≤oxygen of 15ppm and≤hydrogen of 1.5ppm.
4. the described production technique of using the cold-rolled steel working roll of SKD-11 steel of power 1, is characterized in that, described production technique comprises:
S1: the SKD-11 steel that will weigh 1 described composition proportion carry out esr, then are forged into working roll spare;
S2: working roll spare is carried out Spheroidizing Annealing process;
S3: quench treatment for the first time, the working roll spare after Spheroidizing Annealing is processed is put into electric furnace and is heated to 1040 degree, then adopts oil quenchinng cooling;
S4: the working roll spare of quench treatment carries out the high tempering processing for the first time;
S5: quench treatment for the second time, in working roll spare device for hoisting intermediate frequency multi-turn electric heater unit, by adjusting power frequency and the heat-up time of multi-turn electric heater unit, reach and control heat penetration to 30 ~ 50mm, and make body of roll temperature reach 1050 spend and be incubated after, then working roll spare is put into oil sump cooling fast;
S6: the working roll spare of quench treatment carries out 3 average temperings processing more for the second time.
5. use as claimed in claim 4 the production technique of the cold-rolled steel working roll of SKD-11 steel, it is characterized in that, spheroidal annealing process in described S2 comprises that working roll spare being heated to 450 ± 10 degree in electric furnace is incubated 1 hour, and then working roll spare is heated to 650 ± 10 degree insulation 2 hours, again working roll spare is heated to 840 ± 10 insulation 4 ~ 6 hours, and then with per hour 30 the degree speed of cooling with furnace temperature be cooled to 770 ± 10 the insulation 6 ~ 8 hours, and then with per hour 30 the degree speed of cooling with furnace temperature be cooled to 540 the degree below come out of the stove.
6. the production technique of the cold-rolled steel working roll with SKD-11 steel as claimed in claim 4, is characterized in that, it is working roll spare to be heated to 500 ~ 600 degree in electric furnace that the high tempering in described S4 is processed, then use 20 ~ 36 hours cooling.
7. the production technique of the cold-rolled steel working roll with SKD-11 steel as claimed in claim 4, is characterized in that, it is working roll spare to be heated to 350 ~ 500 degree in electric furnace that 3 average temperings in described S6 are processed at every turn, then use 10 ~ 15 hours cooling.
8. the production technique of the cold-rolled steel working roll with SKD-11 steel as claimed in claim 4, it is characterized in that, in the heat-processed of working roll spare in described S5 in intermediate frequency multi-turn electric heater unit, adopt the surface temperature of the double-colored temperature-measuring gun one-point measurement of infrared rays working roll spare.
9. the production technique of using the cold-rolled steel working roll of SKD-11 steel as claimed in claim 4, is characterized in that, the control heat penetration in described S5 is 30mm.
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| CN104388656A (en) * | 2014-12-09 | 2015-03-04 | 西南铝业（集团）有限责任公司 | SKDI import steel production die heat treatment process |
| CN105648359A (en) * | 2016-04-14 | 2016-06-08 | 山东鸿民轧辊模具有限公司 | Wear-resistant cold-working die steel, and application and preparation method thereof |
| CN106086668A (en) * | 2016-06-09 | 2016-11-09 | 广东世创金属科技股份有限公司 | A kind of high-performance high speed stamping cold work die steel and preparation method thereof |
| CN108193028A (en) * | 2016-08-29 | 2018-06-22 | 武汉佰起科技有限公司 | A kind of processing technology for cycle frame strip |
| CN115232950A (en) * | 2022-07-20 | 2022-10-25 | 湖北广力轧辊有限公司 | Integral heat treatment process for cold roll |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103757545A (en) * | 2014-01-29 | 2014-04-30 | 合肥东方节能科技股份有限公司 | High-temperature wearing-resistance alloy material for rolling mill guide and guard unit and rolling mill guide and guard unit thermal treatment method |
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| CN108193028A (en) * | 2016-08-29 | 2018-06-22 | 武汉佰起科技有限公司 | A kind of processing technology for cycle frame strip |
| CN108239693A (en) * | 2016-08-29 | 2018-07-03 | 武汉佰起科技有限公司 | A kind of processing technology of stability strip |
| CN115232950A (en) * | 2022-07-20 | 2022-10-25 | 湖北广力轧辊有限公司 | Integral heat treatment process for cold roll |
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