CN104946982B - Wide thick plate hot-straightening machine working roll and manufacturing method thereof - Google Patents

Wide thick plate hot-straightening machine working roll and manufacturing method thereof Download PDF

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Publication number
CN104946982B
CN104946982B CN201410113904.5A CN201410113904A CN104946982B CN 104946982 B CN104946982 B CN 104946982B CN 201410113904 A CN201410113904 A CN 201410113904A CN 104946982 B CN104946982 B CN 104946982B
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China
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temperature
forging
straightening machine
heat treatment
tempering
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CN201410113904.5A
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CN104946982A (en
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吴琼
范群
孙大乐
张志忠
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宝山钢铁股份有限公司
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Abstract

The invention discloses a wide thick plate hot-straightening machine working roll which comprises the following chemical components in percentage by mass: 0.45-0.55% of C, 0.8-1.5% of Si, 0.8-1.5% of Mn, 3.0-4.0% of Cr, 3.0-4.0% of Mo, 0.8-1.2% of V, 0.3-1.0% of Al, and the balance of Fe and inevitable impurities. The wide thick plate hot-straightening machine working roll can satisfy the technical requirements for the wide thick plate hot-straightening roll, and has higher matrix strength and red hardness than the existing H13 material. The invention also discloses a preparation method of the wide thick plate hot-straightening machine working roll.

Description

A kind of Wide and Thick Slab working roll of hot straightening machine and manufacture method
Technical field
The present invention relates to aligning roll material and manufacture field, it is used for width 1300~4900mm, thickness particularly to a kind of The Wide and Thick Slab thermal straightening of 10~100mm, the working roll mitigating surface of steel plate impression and its manufacture method.
Background technology
At home and abroad in the rolling line equipment arrangement of Wide and Thick Slab factory, the arrangement of milling train-acceleration cooling-thermal straightening machine is Through becoming basic configuration, after thermal straightening machine is arranged in acceleration cooling, through mill milling and quick cooling, steel plate is inevitably Produce various flatness defects and residualinternal stress, set by the rational roll gap of heat rectification machine, so that strip is occurred at high operating temperatures Larger elastic-plastic deformation, realizes multiple alternating bending to reach straightening steel plate, the purpose improved plate shape, reduce internal stress.Cause This, thermal straightening machine has become the key equipment ensureing plate product quality.
As the vitals of thermal straightening machine, the material technology development of smoothing roll is relatively slow.To Patents and document It is analyzed, result is as shown in table 1.Aligning roll material can be divided into Strip smoothing roll and bar, tubing, shaped steel by purposes at present Deng smoothing roll, and Strip smoothing roll is divided into thermal straightening and cold leveling two class by aligning by operation temperature.For bar, pipe Its material of the smoothing rolls such as material, shaped steel mostly is high-chromium alloy, and its manufacturing process, based on casting, also has using many metal composite or edge Set technique etc..Strip smoothing roll, then based on work, mould steel, is solid forging technique.Among these, for the aligning of cold leveling Its material of roller mostly is high-carbon, low-alloyed tool steel or cold work die steel, and its material of smoothing roll being used for thermal straightening mostly is heat Make mould steel.
Wide and Thick Slab working roll of hot straightening machine mainly adopts H13 at present(4Cr5MoSiV1)Hot-work die steel material manufactures, roller In 50~58HRC, using the working roller of straightening machine of H13 material, surface of steel plate impression is that long-standing problem Wide and Thick Slab heat is rectified to surface hardness A straight difficult problem, directly influences the surface quality of steel plate.Thermal straightening machine impression is broadly divided into two classes, and one is longitudinal impression, Two is horizontal impression, and the main occurrence cause of longitudinal impression is the uneven contact between working roll and backing roll, produces local Stress is excessive, causes backing roll roll surface spalling, and the chip under peeling off is bonded on work roll surface, forms the impression of rice-shaped, and Distribution area on steel plate is larger.Laterally impression causes to the shock of roll surface when stinging steel end to end mainly due to steel plate, The area very little that general impression is distributed on steel plate, is similar to the pattern scratching.Get over the requirement to plate surface quality for the user Come higher, thermal straightening machine roll surface impression has become as the biggest obstacle producing high surface requirements steel plate.
The one of the main reasons causing such impression is exactly matrix strength under hot for the H13 material and red hardness still suffers from Not enough.According to the operating characteristic of Wide and Thick Slab thermal straightening machine, working roll need to be chronically at and work under 600~900 DEG C of temperature conditionss(Roller Face temperature would generally reach 500 DEG C), in addition it is also necessary to excellent therefore in addition to requiring higher anti-wear performance and comprehensive mechanical property Different thermal shock resistance, red hardness and thermohardening, meet mechanical stress during high-temperature straightening and thermal stress requires.
Smoothing roll alloying component in table 1 document and patent
The document 1-11 mentioning in table 1 is respectively:
[1] Yao Nianhong, the cold strong roller failure analysis [J] of Zhang Qing, Shen Xin group's .5m Wide and Thick Slab. modern metallurgical, 2009, (6):53- 54.
[2] Xiong Jie, Liu Zhongyuan, Zhang Heng. large-scale forged steel cold leveling roller breakage failure analysis and production domesticization [J]. heavy-duty machinery, 2009,(4):50-53.
[3] Sun Feifei, Zhang Qing, Xie Jing, Wang Jingmei, Ren Zheng. the import cold straightener working roll roll breakage analysis of causes [J]. existing In generation, is metallurgical, and 2011, (5):14-18.
[4] Zhao Dong, Wu Qingjun. application in hot straightening roll material for the german standard din hot die steel X40CrMoV5-1 [J]. Chinese weight equipment, 2012, (2):27-29.
[5] Zheng Pengfei, Zhou Feng. Wide and Thick Slab heat is rectified work roll material and is selected and Heat Treatment Process Analysis [J]. and modern metallurgical, 2011,(4):62-64.
[6] Yuan's thickness. high chromium compound straightening roller [J]. steel pipe, 1993, (6):33-35.
[7] Yuan's thickness. the development of high Cr alloy roller and smoothing roll and promote [J]. welded tube, 2009, (3):31-34.
[8] phase in summer becomes .Cr12MoV steel straightening roller high-temperature salt bath rapid heating and quenching [J]. metal heat treatmet, 1995, (5): 34-36.
[9] Yu Wenping, Liu Yong, the heat treatment [J] of a peak .Cr12MoV steel Heavy Straightening Roller. heat treatment, 2003, (2): 35-37.
[10] Liu Sufang. the heat treatment [J] of super slenderness ratio working roller of sheet rectifier. Jiangsu building materials, 2002, (1):32- 34.
[11] Liu Jianjun, Cao Aibin. the heat treatment [J] of stretch-bend leveller roller. metal heat treatmet, 1999, (6):36.
Content of the invention
One of the technical problem to be solved is Wide and Thick Slab working roll of hot straightening machine, disclosure satisfy that Wide and Thick Slab heat is rectified The technical requirements of straight roller, simultaneously more existing H13 material there is more preferable matrix strength and red hardness.
In order to solve the above problems, the technical scheme is that:
A kind of Wide and Thick Slab working roll of hot straightening machine, its chemical composition includes according to mass percent:
Wide and Thick Slab working roll of hot straightening machine of the present invention is mainly used in width 1300~4900mm, and thickness 10~ The aligning of the Wide and Thick Slab of 100mm.
Preferably, a diameter of 345~360mm of described Wide and Thick Slab working roll of hot straightening machine, barrel length is 5200mm.
It is also provided with cooling water hole on described Wide and Thick Slab working roll of hot straightening machine.
Present invention also offers the preparation method of described Wide and Thick Slab working roll of hot straightening machine, it comprises the steps:(1)Warp Cross heat treatment after forging and forging, raw material roughing is become roller stock;(2)Tempering and Quenching;(3)Finished heat treatment;(4)At tempering Reason;(5)Polish.
Preferably,
In step(1)In described forging process, due to higher alloy content, Wide and Thick Slab thermal straightening machine work as above There will be a certain amount of eutectic carbide as roller it is therefore desirable to appropriate carries out six sides forging.Forging technology is as follows:Initial forging temperature For 1050~1120 DEG C, heating-up temperature is 1120~1170 DEG C, and final forging temperature is 850~900 DEG C.
Step(1)After described forging, heat treatment can adopt isothermal spheroidizing technique, and smoothing roll forging blank is heated To 860 DEG C ± 10 DEG C, it is incubated 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.Hardness after annealing≤ 220HBS.
In step(1)Described in forging post-processing step after, ultrasonic examination can also be carried out.
Step(2)Described Tempering and Quenching can include high temperature solid solution, quenching and high tempering, described high temperature solid solution Temperature is 1150~1180 DEG C, and the time is 3-10h;Described quench for being cooled to room temperature;Described high tempering temperature be 680~ 720 DEG C, the time is 24-48h.Can be by eutectic carbide dissolving and uniform to greatest extent using this quenching-and-tempering process Changing, even if also having not molten eutectic carbide, also becoming tiny, dispersion and rounding, quenching high tempering immediately, energy after solid solution Access the carbide of a large amount of disperse educts, its form is tiny, rounding, provide preferable prepared group for follow-up finished heat treatment Knit.
Step(3)The one procedure of described finished heat treatment wherein most critical, determines described Wide and Thick Slab thermal straightening machine work Make the serviceability of roller, for this elongated specification working roller of straightening machine.Common arrangement heat treating process is adopted in prior art, Heated in circulating hot wind stove or salt bath, until austenitizing insulation integrally puts into oil groove after terminating being quenched, Serious problem on deformation can be produced.Therefore, the present invention reduces size distortion while reaching depth of hardening zone requirement as far as possible, It is impewdance matching for effective quenching mode, for meeting the heating of slab working roller of straightening machine of barrel length 5200mm and quenching Fire.
Preferably, step(3)Described finished heat treatment is carried out using horizontal mid-frequency induction hardening lathe, specifically includes pre- Heat, sensing heating and water-spraying control, 500~600 DEG C of described preheating temperature, preheating time 10-20h;Induction heating temperature is 1050~1150 DEG C, the walking speed 0.5~1.5mm/s of described horizontal mid-frequency induction hardening lathe induction coil, uses roll institute The length that need to heat can obtain the sensing heating time divided by the speed of travel of induction coil.
Further, the frequency of described horizontal mid-frequency induction hardening lathe is preferably 800~2500Hz, the line of induction of selection Loop diameter big 20~30mm than working roller of straightening machine diameter.For reaching stronger cooling effect, described water-spraying control adopts double-round Water-spraying control.
Step(4)Described temper, refers to the drawing process heating up, being incubated and lower the temperature, is preferably warming up to 500~550 DEG C, insulation, it is cooled to room temperature;
It is further preferred that adopting three temper, tempering each time is all warming up to 500~550 DEG C, temperature retention time It is respectively 10~20 hours, be cooled to room temperature respectively.Holding temperature each time and temperature retention time can be identical or different.
Using three temper, can fully eliminate the austenite structure of residual after cooling, improve the tempering of smoothing roll Dimensional stability during stiffness and use.
Step(5)Described polish includes corase grind, ground finish to finished size.
For the working roller of straightening machine material of the present invention is relative to H13 material, its properly increased in chemical composition C, Mn, The content of Mo, and newly with the addition of minor-alloying element Al.For H13 series hot die steel, for reaching certain anti-wear performance, microcosmic Need quenching temperature during the carbide, therefore heat treatment that retention volume fraction is 5% about relatively low in tissue, so meeting Lead to the dissolving of C and alloying element in matrix not enough, thus affecting matrix strength.Improve the shortcut that C content is solve problem, but It is that the content that C is greatly improved can bring series of problems:Toughness meeting decrease to some degree, martensite point temperature also can Decline therewith, smoothing roll quenching distortion, tearing tendency increase, and can reduce thermal conductivity in addition, not be suitable for being elected to be hot straightening roll Material.
Therefore, improving alloying element content is the optimal path solving above-mentioned contradiction.Select suitable C content, improve Mn, The raising of the alloying element contents such as Mo, can further enhance solution strengthening effect, improve the matrix strength of working roller of straightening machine, Improve Mo constituent content simultaneously and can dramatically increase the drag to temper softening for the steel, improve the temper resistance of working roller of straightening machine And red hardness, the hardness higher with respect to H13 material can be kept under higher temperature and operating temperature.Additionally, adding Plus a small amount of Al element, can crystal grain thinning further, the toughness of material of raising smoothing roll.
Using horizontal mid-frequency induction hardening and three tempering, the working roller of straightening machine of manufacture obtains following technological progress:
(1)Microstructure is hidden acicular martensite and carbide, and 5% about, retained austenite contains carbide volume fraction Amount is less than 3%.
(2)Working roller of straightening machine room temperature hardness >=60HRC, depth of hardening zone >=12mm.
(3)Room temperature compressive yield strength >=the 2500MPa of working roller of straightening machine working lining.
(4)When working roller of straightening machine uses, straightening temperature≤520 DEG C, hardness can be maintained at >=60HRC.
(5)The working roller of straightening machine total length deformation amount controlling that finished heat treatment obtains within 2mm, to operation before quenching After surplus control and tempering, the straightening processing of operation reduces difficulty.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail.The unit type mentioned in embodiment It is respectively with producer:
Equipment Model Producer
Horizontal mid-frequency induction hardening lathe HKHP10000 Shanghai Hengjing Electromechanical Equipment Co., Ltd.
Circulating hot wind stove Car type furnace Jiangsu Huadong Furnace Industry Co., Ltd.
Special spray cooling lathe Spray cooling lathe Dalian Wantong Industrial Equipment Co., Ltd.
Embodiment 1
Embodiment 1 is a kind of for width 1300~4900mm, the Wide and Thick Slab thermal straightening machine work of thickness 10~100mm Roller, its chemical composition includes according to mass percent:
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
Preparation method comprises the steps:(1)Heat treatment after forging and forging, raw material roughing is become roller stock;(2) Tempering and Quenching;(3)Finished heat treatment;(4)Temper;(5)Polish.
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
In preparation process,
Step(1)Described forging technology is as follows:Heating-up temperature is 1150 DEG C, and initial forging temperature is 1100 DEG C, and final forging temperature is 870℃.After described forging, heat treatment adopts isothermal spheroidizing technique, and smoothing roll forging blank is heated to 860 DEG C ± 10 DEG C, Insulation 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.
Step(2)Described Tempering and Quenching includes high temperature solid solution, quenching and high tempering, the temperature of described high temperature solid solution For 1160 DEG C, the time is 5h;Described quenching is using oil cooling to room temperature;Described high tempering temperature is 690 DEG C, and the time is 32h.
Step(3)Described finished heat treatment adopts horizontal mid-frequency induction hardening lathe, horizontal mid-frequency induction hardening lathe frequency Rate 2200Hz, the sensing loop diameter 380mm of selection, using double-round water-spraying control.Final Heat Treatment Process parameter is:Preheating temperature 600 DEG C, preheating time 10h, induction heating temperature be 1120 DEG C, walking speed 0.9mm/s of induction coil.
Step(4)Described temper, using three temper, three tempering be warming up to respectively 500 DEG C, 500 DEG C, 500 DEG C, temperature retention time is 20 hours, is cooled to room temperature respectively.
Working roller of straightening machine using above-mentioned technique manufacture reaches following performance:
Step(5)Described polish includes corase grind, ground finish to finished size.
(1)Working roller of straightening machine hardness:61.6HRC, depth of hardening zone:13mm.
(2)The compressive yield strength of working roller of straightening machine working lining:2822MPa.
Embodiment 2
Embodiment 2 is a kind of for width 1300~4900mm, the Wide and Thick Slab thermal straightening machine work of thickness 10~100mm Roller, its chemical composition includes according to mass percent:
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
Preparation method comprises the steps:(1)Heat treatment after forging and forging, raw material roughing is become roller stock;(2) Tempering and Quenching;(3)Finished heat treatment;(4)Temper;(5)Polish.
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
In preparation process,
Step(1)Described forging technology is as follows:Heating-up temperature is 1150 DEG C, and initial forging temperature is 1100 DEG C, and final forging temperature is 870℃.After described forging, heat treatment adopts isothermal spheroidizing technique, and smoothing roll forging blank is heated to 860 DEG C ± 10 DEG C, Insulation 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.
Step(2)Described Tempering and Quenching includes high temperature solid solution, quenching and high tempering, the temperature of described high temperature solid solution For 1150 DEG C, the time is 5h;Described quenching is using oil cooling to room temperature;Described high tempering temperature is 680 DEG C, and the time is 36h.
Step(3)Described finished heat treatment adopts horizontal mid-frequency induction hardening lathe, horizontal mid-frequency induction hardening lathe frequency Rate 2200Hz, the sensing loop diameter 380mm of selection, using double-round water-spraying control.Final Heat Treatment Process parameter is:Preheating temperature 560 DEG C, preheating time 10h, induction heating temperature be 1090 DEG C, walking speed 0.7mm/s of induction coil.
Step(4)Described temper, using three temper, three tempering be warming up to respectively 540 DEG C, 530 DEG C, 500 DEG C, temperature retention time is 10 hours, is cooled to room temperature respectively.
Step(5)Described polish includes corase grind, ground finish to finished size.
Working roller of straightening machine using above-mentioned technique manufacture reaches following performance:
(1)Working roller of straightening machine hardness:60.3HRC, depth of hardening zone:12mm.
(2)The compressive yield strength of working roller of straightening machine working lining:2670MPa.
Embodiment 3
Embodiment 3 is a kind of for width 1300~4900mm, the Wide and Thick Slab thermal straightening machine work of thickness 10~100mm Roller, its chemical composition includes according to mass percent:
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
Preparation method comprises the steps:(1)Heat treatment after forging and forging, raw material roughing is become roller stock;(2) Tempering and Quenching;(3)Finished heat treatment;(4)Temper;(5)Polish.
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
In preparation process,
Step(1)Described forging technology is as follows:Heating-up temperature is 1150 DEG C, and initial forging temperature is 1100 DEG C, and final forging temperature is 870℃.After described forging, heat treatment adopts isothermal spheroidizing technique, and smoothing roll forging blank is heated to 860 DEG C ± 10 DEG C, Insulation 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.
Step(2)Described Tempering and Quenching includes high temperature solid solution, quenching and high tempering, the temperature of described high temperature solid solution For 1180 DEG C, the time is 5h;Described quenching is using oil cooling to room temperature;Described high tempering temperature is 700 DEG C, and the time is 28h.
Step(3)Described finished heat treatment adopts horizontal mid-frequency induction hardening lathe, horizontal mid-frequency induction hardening lathe frequency Rate 2200Hz, the sensing loop diameter 380mm of selection, using double-round water-spraying control.Final Heat Treatment Process parameter is:Preheating temperature 580 DEG C, preheating time 10h, induction heating temperature be 1130 DEG C, walking speed 0.9mm/s of induction coil.
Step(4)Described temper, using three temper, three tempering be warming up to respectively 520 DEG C, 520 DEG C, 510 DEG C, temperature retention time is 12 hours, is cooled to room temperature respectively.
Step(5)Described polish includes corase grind, ground finish to finished size.
Working roller of straightening machine using above-mentioned technique manufacture reaches following performance:
(1)Working roller of straightening machine hardness:60.6HRC, depth of hardening zone:14mm.
(2)The compressive yield strength of working roller of straightening machine working lining:2690MPa.
Embodiment 4
Embodiment 4 is a kind of for width 1300~4900mm, the Wide and Thick Slab thermal straightening machine work of thickness 10~100mm Roller, its chemical composition includes according to mass percent:
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
Preparation method comprises the steps:(1)Heat treatment after forging and forging, raw material roughing is become roller stock;(2) Tempering and Quenching;(3)Finished heat treatment;(4)Temper;(5)Polish.
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
In preparation process,
Step(1)Described forging technology is as follows:Heating-up temperature is 1150 DEG C, and initial forging temperature is 1100 DEG C, and final forging temperature is 870℃.After described forging, heat treatment adopts isothermal spheroidizing technique, and smoothing roll forging blank is heated to 860 DEG C ± 10 DEG C, Insulation 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.
Step(2)Described Tempering and Quenching includes high temperature solid solution, quenching and high tempering, the temperature of described high temperature solid solution For 1160 DEG C, the time is 5h;Described quenching is using oil cooling to room temperature;Described high tempering temperature is 690 DEG C, and the time is 32h.
Step(3)Described finished heat treatment adopts circulating air stove heat, cools down on special spray cooling lathe.Finally Heat treatment process parameter is:500 DEG C of preheating temperature, is incubated 10h, then express delivery is heated to 1120 DEG C in burner hearth, is incubated 1h.
Step(4)Described temper adopts three tempering, and three tempering are warming up to 500 DEG C, 500 DEG C, 500 DEG C respectively, Temperature retention time is 20 hours, is cooled to room temperature respectively.
Step(5)Described polish includes corase grind, ground finish to finished size.
Working roller of straightening machine using above-mentioned technique manufacture reaches following performance:
(1)Working roller of straightening machine hardness:59.6HRC, depth of hardening zone:8mm.
(2)The compressive yield strength of working roller of straightening machine working lining:2622MPa.
(3)Working roller of straightening machine total length deflection is 5mm.
Embodiment 5
Embodiment 5 is a kind of for width 1300~4900mm, the Wide and Thick Slab thermal straightening machine work of thickness 10~100mm Roller, its chemical composition includes according to mass percent:
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
Preparation method comprises the steps:(1)Heat treatment after forging and forging, raw material roughing is become roller stock;(2) Tempering and Quenching;(3)Finished heat treatment;(4)Temper;(5)Polish.
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
In preparation process,
Step(1)Described forging technology is as follows:Heating-up temperature is 1150 DEG C, and initial forging temperature is 1100 DEG C, and final forging temperature is 870℃.After described forging, heat treatment adopts isothermal spheroidizing technique, and smoothing roll forging blank is heated to 860 DEG C ± 10 DEG C, Insulation 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.
Step(2)Described Tempering and Quenching includes high temperature solid solution, quenching and high tempering, the temperature of described high temperature solid solution For 1160 DEG C, the time is 5h;Described quenching is using oil cooling to room temperature;Described high tempering temperature is 690 DEG C, and the time is 32h.
Step(3)Described finished heat treatment adopts horizontal mid-frequency induction hardening lathe, horizontal mid-frequency induction hardening lathe frequency Rate 2200Hz, the sensing loop diameter 380mm of selection, using double-round water-spraying control.Final Heat Treatment Process parameter is:Preheating temperature 600 DEG C, preheating time 10h, induction heating temperature be 1120 DEG C, walking speed 0.9mm/s of induction coil.
Step(4)Described temper adopts double tempering, and double tempering heats up 500 DEG C, 500 DEG C respectively, temperature retention time It is 20 hours, be cooled to room temperature respectively.
Step(5)Described polish includes corase grind, ground finish to finished size.
Working roller of straightening machine using above-mentioned technique manufacture reaches following performance:
(1)Working roller of straightening machine hardness:60.6HRC, depth of hardening zone:13mm.
(2)The compressive yield strength of working roller of straightening machine working lining:2722MPa.
(3)Actual measurement body surface residual austenite content is 6%, and retained austenite is unstable, easily sends out in use Raw transformation is it is possible to cause the change in size of roll.
Comparative example 1
Comparative example 1 is a kind of for width 1300~4900mm, the Wide and Thick Slab thermal straightening machine work of thickness 10~100mm Roller, its chemical composition includes according to mass percent:
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
Preparation method comprises the steps:(1)Heat treatment after forging and forging, raw material roughing is become roller stock;(2) Tempering and Quenching;(3)Finished heat treatment;(4)Temper;(5)Polish.
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
In preparation process,
Step(1)Described forging technology is as follows:Heating-up temperature is 1150 DEG C, and initial forging temperature is 1100 DEG C, and final forging temperature is 870℃.After described forging, heat treatment adopts isothermal spheroidizing technique, and smoothing roll forging blank is heated to 860 DEG C ± 10 DEG C, Insulation 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.
Step(2)Described Tempering and Quenching using quenching and is tempered, and described hardening heat is 950 DEG C, and the time is 5h;Institute State quenching using oil cooling to room temperature;Described temperature is 620 DEG C, and the time is 48h.
Step(3)Described finished heat treatment adopts horizontal mid-frequency induction hardening lathe, horizontal mid-frequency induction hardening lathe frequency Rate 2200Hz, the sensing loop diameter 380mm of selection, using double-round water-spraying control.Final Heat Treatment Process parameter is:Preheating temperature 450 DEG C, induction heating temperature is 1030 DEG C, walking speed 0.6mm/s of induction coil.
Step(4)Described temper adopts double tempering, and double tempering is warming up to 480 DEG C, 480 DEG C, during insulation respectively Between be 12 hours, be cooled to room temperature respectively.
Step(5)Described polish includes corase grind, ground finish to finished size.
Working roller of straightening machine using above-mentioned technique manufacture reaches following performance:
(1)Working roller of straightening machine hardness:56.2HRC, depth of hardening zone:10mm.
(2)The compressive yield strength of working roller of straightening machine working lining:2150MPa.
Comparative example 2
Comparative example 2 is a kind of for width 1300~4900mm, the Wide and Thick Slab thermal straightening machine work of thickness 10~100mm Roller, its chemical composition includes according to mass percent:
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
Preparation method comprises the steps:(1)Heat treatment after forging and forging, raw material roughing is become roller stock;(2) Tempering and Quenching;(3)Finished heat treatment;(4)Temper;(5)Polish.
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
In preparation process,
Step(1)Described forging technology is as follows:Heating-up temperature is 1150 DEG C, and initial forging temperature is 1100 DEG C, and final forging temperature is 870℃.After described forging, heat treatment adopts isothermal spheroidizing technique, and smoothing roll forging blank is heated to 860 DEG C ± 10 DEG C, Insulation 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.
Step(2)Described Tempering and Quenching using quenching and is tempered, and described hardening heat is 950 DEG C, and the time is 5h;Institute State quenching using oil cooling to room temperature;Described temperature is 620 DEG C, and the time is 48h.
Step(3)Described finished heat treatment adopts horizontal mid-frequency induction hardening lathe, horizontal mid-frequency induction hardening lathe frequency Rate 2200Hz, the sensing loop diameter 380mm of selection, using double-round water-spraying control.Final Heat Treatment Process parameter is:Preheating temperature 450 DEG C, induction heating temperature is 1030 DEG C, walking speed 0.6mm/s of induction coil.
Step(4)Described temper adopts double tempering, and double tempering is warming up to 480 DEG C, 480 DEG C, during insulation respectively Between be 12 hours, be cooled to room temperature respectively.
Step(5)Described polish includes corase grind, ground finish to finished size.
Working roller of straightening machine using above-mentioned technique manufacture reaches following performance:
(1)Working roller of straightening machine hardness:57.2HRC, depth of hardening zone:11mm.
(2)The compressive yield strength of working roller of straightening machine working lining:2210MPa.
Comparative example 3
Comparative example 3 is a kind of for width 1300~4900mm, the Wide and Thick Slab thermal straightening machine work of thickness 10~100mm Roller, its chemical composition includes according to mass percent:
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
Preparation method comprises the steps:(1)Heat treatment after forging and forging, raw material roughing is become roller stock;(2) Tempering and Quenching;(3)Finished heat treatment;(4)Temper;(5)Polish.
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
In preparation process,
Step(1)Described forging technology is as follows:Heating-up temperature is 1150 DEG C, and initial forging temperature is 1100 DEG C, and final forging temperature is 870℃.After described forging, heat treatment adopts isothermal spheroidizing technique, and smoothing roll forging blank is heated to 860 DEG C ± 10 DEG C, Insulation 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.
Step(2)Described Tempering and Quenching using quenching and is tempered, and described hardening heat is 950 DEG C, and the time is 5h;Institute State quenching using oil cooling to room temperature;Described temperature is 620 DEG C, and the time is 48h.
Step(3)Described finished heat treatment adopts horizontal mid-frequency induction hardening lathe, horizontal mid-frequency induction hardening lathe frequency Rate 2200Hz, the sensing loop diameter 380mm of selection, using double-round water-spraying control.Final Heat Treatment Process parameter is:Preheating temperature 450 DEG C, induction heating temperature is 1030 DEG C, walking speed 0.6mm/s of induction coil.
Step(4)Described temper adopts double tempering, and double tempering is warming up to 480 DEG C, 480 DEG C, during insulation respectively Between be 12 hours, be cooled to room temperature respectively.
Step(5)Described polish includes corase grind, ground finish to finished size.
Working roller of straightening machine using above-mentioned technique manufacture reaches following performance:
(1)Working roller of straightening machine hardness:57.9HRC, depth of hardening zone:12mm.
(2)The compressive yield strength of working roller of straightening machine working lining:2410MPa.
Comparative example 4
Comparative example 4 is a kind of for width 1300~4900mm, the Wide and Thick Slab thermal straightening machine work of thickness 10~100mm Roller, its chemical composition includes according to mass percent:
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
Preparation method comprises the steps:(1)Heat treatment after forging and forging, raw material roughing is become roller stock;(2) Tempering and Quenching;(3)Finished heat treatment;(4)Temper;(5)Polish.
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
In preparation process,
Step(1)Described forging technology is as follows:Heating-up temperature is 1150 DEG C, and initial forging temperature is 1100 DEG C, and final forging temperature is 870℃.After described forging, heat treatment adopts isothermal spheroidizing technique, and smoothing roll forging blank is heated to 860 DEG C ± 10 DEG C, Insulation 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.
Step(2)Described Tempering and Quenching includes high temperature solid solution, quenching and high tempering, the temperature of described high temperature solid solution For 1160 DEG C, the time is 5h;Described quenching is using oil cooling to room temperature;Described high tempering temperature is 690 DEG C, and the time is 32h.
Step(3)Described finished heat treatment adopts horizontal mid-frequency induction hardening lathe, horizontal mid-frequency induction hardening lathe frequency Rate 2200Hz, the sensing loop diameter 380mm of selection, using double-round water-spraying control.Final Heat Treatment Process parameter is:Preheating temperature 600 DEG C, preheating time 10h, induction heating temperature be 1120 DEG C, walking speed 0.9mm/s of induction coil.
Step(4)Described temper, using three temper, three tempering be warming up to respectively 500 DEG C, 500 DEG C, 500 DEG C, temperature retention time is 20 hours, is cooled to room temperature respectively.
Step(5)Described polish includes corase grind, ground finish to finished size.
Working roller of straightening machine using above-mentioned technique manufacture reaches following performance:
(1)Working roller of straightening machine hardness:59.0HRC, depth of hardening zone:12mm.
(2)The compressive yield strength of working roller of straightening machine working lining:2540MPa.
Comparative example 5
Comparative example 5 is a kind of for width 1300~4900mm, the Wide and Thick Slab thermal straightening machine work of thickness 10~100mm Roller, its chemical composition includes according to mass percent:
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
Preparation method comprises the steps:(1)Heat treatment after forging and forging, raw material roughing is become roller stock;(2) Tempering and Quenching;(3)Finished heat treatment;(4)Temper;(5)Polish.
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
In preparation process,
Step(1)Described forging technology is as follows:Heating-up temperature is 1150 DEG C, and initial forging temperature is 1100 DEG C, and final forging temperature is 870℃.After described forging, heat treatment adopts isothermal spheroidizing technique, and smoothing roll forging blank is heated to 860 DEG C ± 10 DEG C, Insulation 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.
Step(2)Described Tempering and Quenching includes high temperature solid solution, quenching and high tempering, the temperature of described high temperature solid solution For 1160 DEG C, the time is 5h;Described quenching is using oil cooling to room temperature;Described high tempering temperature is 690 DEG C, and the time is 32h.
Step(3)Described finished heat treatment adopts horizontal mid-frequency induction hardening lathe, horizontal mid-frequency induction hardening lathe frequency Rate 2200Hz, the sensing loop diameter 380mm of selection, using double-round water-spraying control.Final Heat Treatment Process parameter is:Preheating temperature 600 DEG C, preheating time 10h, induction heating temperature be 1120 DEG C, walking speed 0.9mm/s of induction coil.
Step(4)Described temper, using three temper, three tempering be warming up to respectively 500 DEG C, 500 DEG C, 500 DEG C, temperature retention time is 20 hours, is cooled to room temperature respectively.
Step(5)Described polish includes corase grind, ground finish to finished size.
Working roller of straightening machine using above-mentioned technique manufacture reaches following performance:
(1)Working roller of straightening machine hardness:59.3HRC, depth of hardening zone:12mm.
(2)The compressive yield strength of working roller of straightening machine working lining:2590MPa.
Comparative example 6
Comparative example 6 is a kind of for width 1300~4900mm, the Wide and Thick Slab thermal straightening machine work of thickness 10~100mm Roller, its chemical composition includes according to mass percent:
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
Preparation method comprises the steps:(1)Heat treatment after forging and forging, raw material roughing is become roller stock;(2) Tempering and Quenching;(3)Finished heat treatment;(4)Temper;(5)Polish.
A diameter of 360mm of the working roller of straightening machine made, barrel length is 5200mm, and there is cooling water hole centre.
In preparation process,
Step(1)Described forging technology is as follows:Heating-up temperature is 1150 DEG C, and initial forging temperature is 1100 DEG C, and final forging temperature is 870℃.After described forging, heat treatment adopts isothermal spheroidizing technique, and smoothing roll forging blank is heated to 860 DEG C ± 10 DEG C, Insulation 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove.
Step(2)Described Tempering and Quenching includes high temperature solid solution, quenching and high tempering, the temperature of described high temperature solid solution For 1160 DEG C, the time is 5h;Described quenching is using oil cooling to room temperature;Described high tempering temperature is 690 DEG C, and the time is 32h.
Step(3)Described finished heat treatment adopts horizontal mid-frequency induction hardening lathe, horizontal mid-frequency induction hardening lathe frequency Rate 2200Hz, the sensing loop diameter 380mm of selection, using double-round water-spraying control.Final Heat Treatment Process parameter is:Preheating temperature 600 DEG C, preheating time 10h, induction heating temperature be 1120 DEG C, walking speed 0.9mm/s of induction coil.
Step(4)Described temper, using three temper, three tempering be warming up to respectively 500 DEG C, 500 DEG C, 500 DEG C, temperature retention time is 20 hours, is cooled to room temperature respectively.
Step(5)Described polish includes corase grind, ground finish to finished size.
Working roller of straightening machine using above-mentioned technique manufacture reaches following performance:
(1)Working roller of straightening machine hardness:58.4HRC, depth of hardening zone:12mm.
(2)The compressive yield strength of working roller of straightening machine working lining:2420MPa.
Embodiment of above is only the illustrative embodiments of invention it is impossible to be used for limiting the present invention, the protection of the present invention Scope is defined by the claims.Those skilled in the art can do to the present invention in the essence and protection domain of the present invention Go out various modifications or equivalent, these modifications or equivalent also should be regarded as being within the scope of the present invention.

Claims (4)

1. a kind of Wide and Thick Slab working roll of hot straightening machine is it is characterised in that its chemical composition includes according to mass percent:
Its preparation method comprises the steps:(1) heat treatment after forging and forging, raw material roughing is become roller stock;(2) adjust Matter heat treatment;(3) finished heat treatment;(4) temper;(5) polish;
Step is forged to six sides forging described in (1), and forging technology is as follows:Initial forging temperature is 1050~1120 DEG C, and heating-up temperature is 1120~1170 DEG C, final forging temperature is 850~900 DEG C;
Step (1) described forging after heat treatment adopt isothermal spheroidizing technique, by smoothing roll forging blank be heated to 860 DEG C ± 10 DEG C, it is incubated 10h, is cooled to 710~720 DEG C of isothermal 20h again, stove is as cold as 550 DEG C and comes out of the stove;
The described finished heat treatment of step (3) is carried out using horizontal mid-frequency induction hardening lathe, specifically include preheating, sensing heating and Water-spraying control;500~600 DEG C of described preheating temperature, preheating time is 10-20h, and described induction heating temperature is 1050~1150 DEG C, the walking speed 0.5~1.5mm/s of the induction coil of horizontal mid-frequency induction hardening lathe;
The frequency of described horizontal mid-frequency induction hardening lathe is 800~2500Hz, the sense of described horizontal mid-frequency induction hardening lathe Answer coil diameter than working roller of straightening machine diameter big 20~30mm;
The described temper of step (4), using three temper, tempering each time is all warming up to 500~550 DEG C, insulation Time is respectively 10~20 hours, is cooled to room temperature respectively.
2. Wide and Thick Slab working roll of hot straightening machine as claimed in claim 1 it is characterised in that:Described Wide and Thick Slab thermal straightening machine work A diameter of 345~360mm of roller, barrel length is 5200mm.
3. Wide and Thick Slab working roll of hot straightening machine as claimed in claim 1 it is characterised in that:Locate after forging described in step (1) After reason step, also carry out ultrasonic examination.
4. Wide and Thick Slab working roll of hot straightening machine as claimed in claim 1 it is characterised in that:At quenched heat described in step (2) Reason includes high temperature solid solution, quenching and high tempering, and the temperature of described high temperature solid solution is 1150~1180 DEG C, and the time is 3-10h;Institute State quenching for being cooled to room temperature;Described high tempering temperature is 680~720 DEG C, and the time is 24-48h.
CN201410113904.5A 2014-03-25 2014-03-25 Wide thick plate hot-straightening machine working roll and manufacturing method thereof CN104946982B (en)

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CN105648349B (en) * 2016-04-11 2017-07-07 重庆钢铁(集团)有限责任公司 A kind of preparation method of cut deal hot straightening roll
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CN106282496B (en) * 2016-08-31 2017-10-17 马鞍山市恒泰重工机械有限公司 A kind of Heavy Straightening Roller processing method
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CN107983853B (en) * 2017-12-27 2019-11-01 哈尔滨锅炉厂有限责任公司 A kind of production method of the leveling apparatus and its smoothing wheel of station boiler band steel band
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