CN108906884A - A kind of zerolling production method of high-performance 20CrMnTi pinion steel - Google Patents
A kind of zerolling production method of high-performance 20CrMnTi pinion steel Download PDFInfo
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- CN108906884A CN108906884A CN201810653919.9A CN201810653919A CN108906884A CN 108906884 A CN108906884 A CN 108906884A CN 201810653919 A CN201810653919 A CN 201810653919A CN 108906884 A CN108906884 A CN 108906884A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0224—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for wire, rods, rounds, bars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/02—Austenitic rolling
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Abstract
The invention belongs to metallurgy industry special steels to produce and process field, and the zerolling production method for being related to a kind of high-performance 20CrMnTi pinion steel is successively comprised the following steps using 20CrMnTi continuous casting billet as raw material：Heating, de-scaling, roughing, tandem rolling, Water cooling, the finish rolling of bar reducing-sizing mill, cold bed are cooling, finally obtain finished product bar.The zerolling production method of above-mentioned high-performance 20CrMnTi pinion steel optimizes heating furnace heating process system, reduces heating energy consumption, saves production cost, protects environment；High performance 20CrMnTi pinion steel is obtained, the control of its grain size, hardness control and mechanical property control are superior to pair rolling technique, its metallographic structure is that ferrite adds pearlite, hardness body is commonly 170-220HBW, its grain size is tiny and uniform, for round steel grain size after rolling at least up to 9.0 grades, comprehensive mechanical property is superior to pair rolling technique.
Description
Technical field
The invention belongs to metallurgy industry special steels to produce and process field, be related to a kind of rolling mill practice more particularly to a kind of high
The zerolling production method of performance 20CrMnTi pinion steel.
Background technique
In recent years, with the rapid development of our country's economy, China's automobile industry and machine industry have obtained fast
Exhibition is hailed, in this background, the dosage and kind of pinion steel are also growing, also gradually mention to the quality requirement of pinion steel
It is high.20CrMnTi pinion steel has the mechanical properties such as harden ability is good, low-temperature impact toughness is excellent, anti-fatigue performance is good,
20CrMnTi pinion steel is always the Variety comprehensive of China's gear steel, is widely used in gear, axis class, piston type zero in China
Accessory.
Publication No. CN106755869A, the patent of entitled " a kind of method of low energy consumption production Q550D steel plate " are introduced
It is directly placed into heating furnace after a kind of cutting by the continuous casting billet cast and is again heated, the continuous casting billet after heating is carried out
Controlled rolling, the invention heat red send of continuous casting billet into heating furnace, red to send temperature up to 705 DEG C or more.This method uses hot charging
Hot sending technology reduces heating energy consumption, but without inherently reducing heating furnace heating temperature, and the present invention is directed it is general
Logical carbon steel, produces and is not suitable with for the technique of pinion steel.
Document《The practice of Wuhan Iron and Steel Plant 1580mm production line cooling rolling mill practice》(Xu Xiyi, Li Chuan, Tan Wen Wuhan Iron and Steel Plant 1580mm
Production line cooling rolling mill practice practices [J] steel rolling, 2014,31 (1)：It 24-29) describes in existing temperature system
Heating temperature is excessively high and causes that energy consumption is higher, the higher pressure of production cost, has carried out cooling mill rolling practice, part merchantable timber and
1170 DEG C are down to from 1250 DEG C for the hot rolling heating temperature of steel strip for cold rolling.Though being optimized from temperature system herein
Technique, but steel grade does not refer to the technique production of pinion steel mainly for ordinary carbon steel.
Document《42CrMo alloy bar material cooling Research of Rolling Process》(Wei Liqun, Liu Mouyuan, Chen Hanhui wait .42CrMo to close
Golden bar cooling Research of Rolling Process [J] steel, 2009,44 (9)：53-57) combine field measurement parameter and theoretical calculation mould
Type, the heating temperature for proving 42CrMo steel drop to 1030 DEG C from 1150 DEG C, influence on the force-power parameter of milling train and main motor, thus
Reduce heating energy consumption.The paper specifically describes the rolling mill practice method for closing knot steel, but without specifically each section of temperature of explanation heating
Degree control and heating time, and steel grade is that common close ties steel, and the technique production of pinion steel is not referred to.
The prior art heats the 20CrMnTi rolling production method of energy consumption for reducing, and has the disadvantage that：It is most
Iron and steel enterprise never has much variations for the heating process of 20CrMnTi pinion steel, using high-temperature heating (furnace temperature 1220-
1280 DEG C), high temperature rolling mode (1150-1250 DEG C of rolling temperature), the process not only waste heating energy source consumption, increase
Production cost, but also it is unfavorable for the protection of environment, with the increasing of China environmental protection dynamics, Resources for construction economies, ring
Border friendly is the inexorable trend of steel industry future development.
By literature search and patent consulting, the zerolling production technology of pinion steel is not referred at present.This skill
The main reason in art field using being heated at high temperature with high temperature rolling without using zerolling production technology production pinion steel
It is：(1) high-temperature heating is conducive to metal plastic deformation, reduces milling train resistance of deformation, improves milling train production stability；(2) high
Temperature heating is conducive to austenite structure homogenization, improves the grain size of pinion steel.It is main using low-temperature heat zerolling technology
Difficult point is：(1) height is required to the non-deformability of main rolling line milling equipment, conventional mill is more difficult competent；(2) zerolling skill
Art is a special kind of skill that metallurgy industry started in recent years, its advantage is the comprehensive mechanical property of raising material, but domestic at present
Steel producer is also in the stage of fumbling.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of high-performance for reducing heating energy consumption
20CrMnTi zerolling production method.The excellent 20CrMnTi gear of comprehensive mechanical property can be produced using the process
Steel, while also greatly reducing heating furnace energy consumption, not only saved production cost but also protecting natural environment.
To achieve the above object, the present invention uses following technical scheme：
A kind of zerolling production method of high-performance 20CrMnTi pinion steel, using 20CrMnTi continuous casting billet as raw material, institute
Production method is stated successively to comprise the following steps：It is heating, de-scaling, roughing, tandem rolling, Water cooling, the finish rolling of bar reducing-sizing mill, cold
Bed is cooling, finally obtains finished product bar.
Using reduction heating energy consumption, the technical principle that zerolling produces 20CrMnTi steel grade is the present invention：According to
There is the TiN (N is in high-temperature smelting process and Ti element forms TiN nitride) of 20CrMnTi gear steel grade refinement crystal grain to make
With, during heating, because the high temperature fusing point of TiN is up to 1300 DEG C or more, thus by heating furnace high-temperature heating be not achieved TiN's
Sufficiently solid solution, thus using cooling heating process, TiN, which equally has, inhibits the long main trend of autstenitic grain size, in the operation of rolling
Middle TiN disperse educt has the function of preventing austenite recrystallization, at the same time, by controlled rolling and controlled cooling technique,
During the rolling process, by plastic deformation, not only make grain size in crystal boundary forming core, and can on Zona transformans forming core, make crystal grain
Degree more refines, and material mechanical performance not only can be improved, and the grain size number of material can be improved, makes material comprehensive performance
It is excellent.Therefore by this mechanism, research reduces heating energy consumption, and zerolling produces 20CrMnTi steel grade, and the present invention not only can be with
Heating energy consumption is reduced, and the 20CrMnTi pinion steel of good mechanical performance can be produced.
In the rolling production method, as a preferred implementation manner, in the heating process, to the continuous casting billet into
Row heating, the temperature of soaking zone be 1100~1150 DEG C (such as 1105 DEG C, 1110 DEG C, 1115 DEG C, 1120 DEG C, 1125 DEG C, 1130
DEG C, 1135 DEG C, 1140 DEG C, 1145 DEG C), the soaking time of the soaking zone be 30~80min (such as 32min, 35min,
40min、45min、50min、55min、60min、70min、75min、78min)。
To be further reduced energy consumption and improving heating quality, it is highly preferred that being divided into four sections in the heating process and adding
Heat is followed successively by preheating section, one section of heating, heating two sections and soaking zone；Wherein,
Temperature≤800 DEG C (such as 600 DEG C, 700 DEG C, 750 DEG C, 780 DEG C, 795 DEG C) of the preheating section；Such as preheating section
Temperature is excessively high, then may be too fast because of steel billet heat conduction rate, and then leads to final stocking face crack；
1000~1050 DEG C of temperature (such as 1005 DEG C, 1010 DEG C, 1020 DEG C, 1030 DEG C, 1040 of one section of the heating
℃,1145℃)；
1050~1100 DEG C of temperature (such as 1055 DEG C, 1060 DEG C, 1070 DEG C, 1080 DEG C, 1090 of two sections of the heating
℃,1095℃)；The main function of one section of the heating and two sections of the heating is：Energy consumption is reduced, billet oxidization is reduced
Scaling loss；
The soaking zone 1100~1150 DEG C of temperature (such as 1105 DEG C, 1110 DEG C, 1115 DEG C, 1120 DEG C, 1125 DEG C,
1130℃,1135℃,1140℃,1145℃)；The main function of the soaking zone is：Energy consumption is reduced, steel billet oxygen is reduced
Change scaling loss, while reducing steel billet decarburization；
It is further preferred that total heating time in the heating process be 3~5h (such as 3.2h, 3.5h, 4h, 4.5h,
4.8h), the soaking time of the soaking zone be 30~80min (such as 32min, 35min, 40min, 45min, 50min,
55min,60min,70min,75min,78min)；It so more can more sufficiently realize following four targets：(1) energy is reduced to disappear
Consumption；(2) billet oxidization burning loss is reduced；(3) steel billet decarburization is reduced；(4) it reduces and brings final stocking surface because heating time is too long
Crackle；It is highly preferred that the heating process carries out in four sections of walking beam furnaces.
In the rolling production method, as a preferred implementation manner, in the de-scaling process, using high-pressure water descaling
With removing iron scale, 25~30MPa of pressure of the high pressure water (such as 25.5MPa, 26MPa, 26.5MPa, 27MPa, 28MPa,
28.5MPa,29MPa,29.5MPa)；Preferably 28~30MPa.
In the rolling production method, as a preferred implementation manner, in the roughing operation, inlet temperature 980
~1050 DEG C (such as 985 DEG C, 990 DEG C, 1000 DEG C, 1010 DEG C, 1020 DEG C, 1030 DEG C, 1040 DEG C, 1045 DEG C), roughing passage
For 5~7 passages；Preferably, totally 6 frame, roughing passage are 6 passages to roughing mill used in the roughing operation.In roughing operation
Be conducive to improve pinion steel comprehensive mechanical property using zerolling technology, if temperature is excessively high, then pinion steel grain size was grown
Greatly, it is unfavorable for improving material comprehensive mechanical property.
In the rolling production method, as a preferred implementation manner, the tandem rolling process include in roll process and pre-
Finishing rolling step, obtains fitting into the supplied materials of bar reducing-sizing mill after tandem rolling, it is described in roll the inlet temperature of process be 900~
950 DEG C (such as 905 DEG C, 910 DEG C, 920 DEG C, 930 DEG C, 940 DEG C, 945 DEG C), middle mill train time is 5~7 passages；The pre- finish rolling
In process, pre- essence passage is 3~5 passages, and pre- exit temperature at finishing is 870-950 DEG C of (such as 875 DEG C, 880 DEG C, 890 DEG C, 900
℃,910℃,920℃,930℃,940℃,945℃)；Preferably, it is rolled in described and milling train in 6 framves is set altogether in process, it is described pre-
4 frame pre-finishing mills are set altogether in finishing rolling step, and the middle mill train time is 6 passages, and the pre- finishing pass is 4 passages.
In the rolling production method, as a preferred implementation manner, in the Water cooling process, after tandem rolling
Supplied materials is cooled by water to 700~750 DEG C of (such as 702 DEG C, 705 DEG C, 710 DEG C, 720 DEG C, 730 DEG C, 740 DEG C, 745 DEG C, 748
℃)；Within this range by the control of Water cooling temperature, capable of giving stocking, there are enough red temperature distances, if temperature is not controlled
For system in this temperature range, it is too high or too low to may cause subsequent rolling temperature, to gear steel grade grain size, comprehensive mechanical property,
Hardness can bring a degree of adverse effect；Preferably, the water cooling speed of the Water cooling be 35~100 DEG C/s (such as
38℃/s、42℃/s、45℃/s、50℃/s、55℃/s、60℃/s、70℃/s、80℃/s、90℃/s、95℃/s、98℃/
S), hydraulic pressure be 0.2~0.6MPa (such as 0.25MPa, 0.3MPa, 0.35MPa, 0.4MPa, 0.45MPa, 0.5MPa,
0.55MPa).The purpose of the Water cooling process be reduce rolling temperature, realize zerolling, improve bar tissue and
Comprehensive mechanical property.
In the rolling production method, as a preferred implementation manner, in the bar reducing-sizing mill finishing rolling step,
Inlet temperature is 800~830 DEG C (such as 802 DEG C, 805 DEG C, 810 DEG C, 815 DEG C, 820 DEG C, 825 DEG C, 828 DEG C)；Preferably, institute
Stating bar reducing-sizing mill finish rolling is KOCKS rolling.Zerolling can be better implemented using the finish rolling of bar reducing-sizing mill, from
And improve gear steel grade grain size, comprehensive mechanical property, reduce hardness, its excellent properties is provided for the production of pinion steel.
In the rolling production method, the specific method of the cold bed process is as a preferred implementation manner,：It is preferred
The bar obtained after bar reducing-sizing mill finish rolling is slowly cooled to 600 DEG C in cold bed insulation cover, the then heat preservation out
It is air-cooled that cover carries out cold bed；Pinion steel hardness number can preferably be controlled using slow cooling in cover, reduce postorder heat-treatment of annealing expense, contracting
Short process flow, energy conservation and environmental protection；Preferably, the cooling velocity of the Slow cooling is≤15 DEG C/min (such as 14 DEG C/min, 13
DEG C/min, 12 DEG C/min, 10 DEG C/min, 8 DEG C/min, 5 DEG C/min, 3 DEG C/min, 2 DEG C/min, 1 DEG C/min), why will cover
The cooling velocity of interior slow cooling be limited in 15 DEG C/min hereinafter, main purpose be control its pinion steel hardness number, if cooling it is too fast,
It may cause hardness number or metallographic structure be unsatisfactory for user's requirement.
In the rolling production method, the finished product bar specification is 50~100mm as a preferred implementation manner,.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) the zerolling production method of high-performance 20CrMnTi pinion steel provided by the invention, optimizes heating furnace and adds
Thermal process system reduces heating energy consumption, saves production cost, protects environment；
(2) present invention has obtained high performance 20CrMnTi pinion steel, crystal grain by online zerolling technical matters
Degree control, hardness control and mechanical property control are superior to pair rolling technique, and specifically, metallographic structure is that ferrite adds pearl
Body of light, hardness body are commonly 170-220HBW, and grain size is tiny and uniform, and the round steel grain size after rolling is at least up to 9.0
Grade, comprehensive mechanical property are superior to pair rolling technique.
Detailed description of the invention
Fig. 1 is the 20CrMnTi steel grade metallographic structure photo that the embodiment of the present invention 1 rolls；
Fig. 2 is the 20CrMnTi steel grade grain size photo that the embodiment of the present invention 1 rolls；
Fig. 3 is the 20CrMnTi steel grade metallographic structure photo that the embodiment of the present invention 2 rolls；
Fig. 4 is the 20CrMnTi steel grade grain size photo that the embodiment of the present invention 2 rolls.
Specific embodiment
Technical solution of the present invention is described in further detail by example below in conjunction with attached drawing.
The mass percent content of 20CrMnTi material prepared by the present invention, chemical component is：C：0.17~0.23；
Si：0.17~0.37；Mn：0.80~1.10；Cr：1.00~1.30；Ti：0.04~0.10；P≤0.025；S≤0.020；Al：
0.02~0.05；N:0.0040~0.0060；Remaining is Fe, and mass fraction amounts to 100%.Chromium, manganese in the material are
The main added elements of 20CrMnTi steel play the role of improving its body intensity and increase harden ability；And the addition of titanium makes crystal grain in steel
Refinement, can prevent crystal grain when carburizing from growing up, and improve the intensity and toughness of steel；N is formed in high-temperature smelting process with Ti element
TiN nitride.
The zerolling production method of high-performance 20CrMnTi pinion steel provided by the invention is with 20CrMnTi continuous casting billet
Raw material, raw material continuous casting billet of the invention pass through conventional smelting, refining, continuous casting working procedure acquisition, are no longer described in detail herein.
The zerolling production method of high-performance 20CrMnTi pinion steel provided by the invention successively comprises the following steps：Add
Heat, de-scaling, roughing, tandem rolling, Water cooling, the finish rolling of bar reducing-sizing mill, cold bed are cooling, finally obtain finished product bar.This is rolled
Specific step is as follows for the preferred embodiment of method processed：
(1) heating steel billet：Heating process carries out in four sections of walking beam furnaces, temperature≤800 DEG C of preheating section；It is described
1000~1050 DEG C of temperature of one section of heating；1050~1100 DEG C of temperature of two sections of the heating；The temperature of the soaking zone
1100~1150 DEG C；It is further preferred that total heating time (i.e. from furnace is entered to the time come out of the stove) in the heating process is 3
~5h, the soaking time of the soaking zone are 30~80min；
(2) descaling of steel stock：Use high-pressure water descaling with removing iron scale, the pressure of the high pressure water on the steel billet after heating
25~30MPa；Preferably 28~30MPa.
(3) roughing steel billet：Steel billet after de-scaling is sent into the progress roughing of 6 frame of high rigidity roughing mill and obtains roughed bloom；It is preferred that
Inlet temperature is 980~1050 DEG C, and roughing passage is 6 passages.
(4) Continuous mill train tandem rolling：The roughed bloom that step (3) is obtained is sent into Continuous mill train, in roll inlet temperature be 900~
950 DEG C, middle mill train time is 6 passages, and pre- finishing pass is 4 passages.
(5) Water cooling：Stocking after pre- finish rolling is subjected to Water cooling；Preferably, above-mentioned Water cooling is cold by temperature
But to 700~750 DEG C；Preferably, the water cooling speed of the Water cooling is 35~100 DEG C/s, and hydraulic pressure is 0.2~0.6MPa.
Stocking is allowed to return the red temperature to obtain KOCKS rolling after Water cooling.
(6) KOCKS is rolled：The stocking that step (5) is obtained carries out KOCKS rolling, obtains bar；Preferably, KOCKS rolls
The inlet temperature of system is 800~830 DEG C.
(7) cold bed is cooling：Bar slowly cools to 600 DEG C in cold bed insulation cover, and then the insulation cover progress is cold out
Bed is air-cooled；Preferably, the cooling velocity of the Slow cooling is≤15 DEG C/min.
Embodiment 1
The zerolling production method of high-performance 20CrMnTi pinion steel provided in this embodiment, required finished product 20CrMnTi
The specification of steel grade is 50mm, is included the following steps：
(1) heating steel billet：Mode will be sent to be put into four sections of step-by-step movements using cold after the cutting of 300 × 400 × 9000mm continuous casting billet
It is heated again in heating furnace, wherein the mass percent of each content ingredient is in continuous casting billet：C：0.191；Si：0.184；
Mn：1.005；Cr：1.024；Ti：0.057；P：0.015；S：0.012；Al：0.023；N：0.0055；Remaining is Fe, quality point
Number amounts to 100%；
660 DEG C of the temperature of preheating section, 1025 DEG C of temperature of one section of heating, 1080 DEG C of temperature of two sections of heating, soaking zone
1128 DEG C of temperature；Total heating time in the heating process is 3.5h, and the soaking time of soaking zone is 55min；
(2) descaling of steel stock：Use high-pressure water descaling with removing iron scale, the pressure of high pressure water on the steel billet after heating
30MPa；
(3) roughing steel billet：Steel billet after de-scaling is sent into high rigidity roughing mill (6 frame) progress roughing and obtains roughing strip plate；
Roughing inlet temperature is 1020 DEG C, and roughing passage is 6 passages.
(4) Continuous mill train tandem rolling：The roughed bloom that step (3) is obtained is sent into Continuous mill train, in roll inlet temperature be 930
DEG C, middle mill train time is 6 passages, and pre- exit temperature at finishing is 900 DEG C, and pre- finishing pass is 4 passages.
(5) Water cooling：Stocking after pre- finish rolling is subjected to Water cooling；Temperature is cooled to 735 DEG C；Water cooling speed is 60
DEG C/s, hydraulic pressure 0.4MPa.
(6) KOCKS is rolled：The stocking that specification 70mm is obtained after pre- finish rolling is subjected to KOCKS rolling, obtaining specification is 50mm
Bar；The inlet temperature of KOCKS rolling is 820 DEG C.
(7) cold bed is cooling：The specification that step (6) is obtained is for 50mm bar with cooling velocity 10 in cold bed insulation cover
DEG C/min slowly cools to 600 DEG C, then to carry out cold bed air-cooled for the insulation cover out, finally obtains finished product bar.
Under the rolling process, 20CrMnTi rolled tissue is ferrite+pearlite (referring to Fig. 1 and Fig. 2), stick
Material product mechanical property is as shown in table 1.
1 embodiment 1 of table prepares the mechanical performance of product
Embodiment 2
The zerolling production method of high-performance 20CrMnTi pinion steel provided in this embodiment, required finished product 20CrMnTi
The specification of steel grade is 80mm, is included the following steps：
(1) heating steel billet：Will 300 × 400 × 9000mm continuous casting billet cutting after using it is red send mode be put into heating furnace into
Row heats again, wherein the mass percent of each content ingredient is in continuous casting billet：C：0.195；Si：0.219；Mn：1.041；
Cr：1.103；Ti：0.049；P：0.012；S：0.008；Al：0.034；N：0.0050；Remaining is Fe, and mass fraction amounts to
100%；
620 DEG C of the temperature of preheating section；1030 DEG C of temperature of one section of heating；1065 DEG C of temperature of two sections of heating；Soaking zone
1135 DEG C of temperature；Total heating time in heating process is 4.0h, and the soaking time of soaking zone is 62min；
(2) descaling of steel stock：Use high-pressure water descaling with removing iron scale, the pressure of high pressure water on the steel billet after heating
29.5MPa；
(3) roughing steel billet：Steel billet after de-scaling is sent into high rigidity roughing mill (6 frame) progress roughing and obtains roughed bloom；Slightly
Rolling inlet temperature is 1015 DEG C, and roughing passage is 6 passages.
(4) Continuous mill train tandem rolling：The roughed bloom that step (3) is obtained is sent into Continuous mill train, in roll inlet temperature be 925
DEG C, middle mill train time is 6 passages, and pre- exit temperature at finishing is 880 DEG C, and pre- finishing pass is 4 passages.
(5) Water cooling：Stocking after pre- finish rolling is subjected to Water cooling；Temperature is cooled to 720 DEG C；Water cooling speed is 55
DEG C/s, hydraulic pressure 0.35MPa.
(6) KOCKS is rolled：The stocking that specification 95mm is obtained after pre- finish rolling is subjected to KOCKS rolling, obtaining specification is 80mm
Bar；The inlet temperature of KOCKS rolling is 812 DEG C.
(7) cold bed is cooling：The specification that step (6) is obtained be 80mm bar in cold bed insulation cover with 7 DEG C of cooling velocity/
Min slowly cools to 600 DEG C, and then the insulation cover progress cold bed is air-cooled out, finally obtains finished product bar.
Under the rolling process, 20CrMnTi rolled tissue is ferrite+pearlite (referring to Fig. 3 and Fig. 4), stick
Material product mechanical property is as shown in table 2.
2 embodiment 2 of table prepares the mechanical performance of product
Embodiment 3
The zerolling production method of high-performance 20CrMnTi pinion steel provided in this embodiment, required finished product 20CrMnTi
The specification of steel grade is 100mm, is included the following steps：
(1) heating steel billet：Will 300 × 400 × 9000mm continuous casting billet cutting after using it is cold send mode be put into heating furnace into
Row heats again, wherein the mass percent of each content ingredient is in continuous casting billet：C：0.201；Si：0.196；Mn：1.025；
Cr：1.054；Ti：0.068；P：0.020；S：0.006；Al：0.033；N：0.0048；Remaining is Fe, and mass fraction amounts to
100%；
680 DEG C of the temperature of preheating section；1040 DEG C of temperature of one section of heating；1085 DEG C of temperature of two sections of heating；Soaking zone
1125 DEG C of temperature；Total heating time in heating process is 4.2h, and the soaking time of soaking zone is 60min；
(2) descaling of steel stock：Use high-pressure water descaling with removing iron scale, the pressure of high pressure water on the steel billet after heating
29.5MPa；
(3) roughing steel billet：Steel billet after de-scaling is sent into the progress roughing of 6 frame of high rigidity roughing mill and obtains roughed bloom；Roughing
Inlet temperature is 1020 DEG C, and roughing passage is 6 passages.
(4) Continuous mill train tandem rolling：The roughed bloom that step (3) is obtained is sent into Continuous mill train, in roll inlet temperature be 925
DEG C, middle mill train time is 6 passages, and pre- exit temperature at finishing is 870 DEG C, and pre- finishing pass is 4 passages.
(5) Water cooling：Stocking after pre- finish rolling is subjected to Water cooling；Temperature is cooled to 725 DEG C；Water cooling speed is 45
DEG C/s, hydraulic pressure 0.40MPa.
(6) KOCKS is rolled：The stocking that specification 125mm is obtained after pre- finish rolling is subjected to KOCKS rolling, obtaining specification is
100mm bar；The inlet temperature of KOCKS rolling is 807 DEG C.
(7) cold bed is cooling：The specification that step (6) is obtained is for 100mm bar with cooling velocity 6 in cold bed insulation cover
DEG C/min slowly cools to 600 DEG C, then to carry out cold bed air-cooled for the insulation cover out, finally obtains finished product bar.
Under the rolling process, 20CrMnTi rolled tissue is ferrite+pearlite, bar product mechanical property
As shown in table 3.
3 embodiment 3 of table prepares the mechanical performance of product
Embodiment 4
The zerolling production method of high-performance 20CrMnTi pinion steel provided in this embodiment, required finished product 20CrMnTi
The specification of steel grade is 70mm, is included the following steps：
(1) heating steel billet：Will 300 × 400 × 9000mm continuous casting billet cutting after using it is cold send mode be put into heating furnace into
Row heats again, wherein the mass percent of each content ingredient is in continuous casting billet：C：0.201；Si：0.196；Mn：1.025；
Cr：1.054；Ti：0.068；P：0.020；S：0.006；Al：0.033；N：0.0057；Remaining is Fe, and mass fraction amounts to
100%；
780 DEG C of the temperature of preheating section；1050 DEG C of temperature of one section of heating；1100 DEG C of temperature of two sections of heating；Soaking zone
1145 DEG C of temperature；Total heating time in heating process is 4.8h, and the soaking time of soaking zone is 80min；
(2) descaling of steel stock：Use high-pressure water descaling with removing iron scale, the pressure of high pressure water on the steel billet after heating
27MPa；
(3) roughing steel billet：Steel billet after de-scaling is sent into the progress roughing of 6 frame of high rigidity roughing mill and obtains roughed bloom；Roughing
Inlet temperature is 1045 DEG C, and roughing passage is 6 passages.
(4) Continuous mill train tandem rolling：The roughed bloom that step (3) is obtained is sent into Continuous mill train, in roll inlet temperature be 945
DEG C, middle mill train time is 6 passages, and pre- exit temperature at finishing is 885 DEG C, and pre- finishing pass is 4 passages.
(5) Water cooling：Stocking after pre- finish rolling is subjected to Water cooling；Temperature is cooled to 745 DEG C；Water cooling speed is 75
DEG C/s, hydraulic pressure 0.55MPa.
(6) KOCKS is rolled：The stocking that specification 95mm is obtained after pre- finish rolling is subjected to KOCKS rolling, obtaining specification is 70mm
Bar；The inlet temperature of KOCKS rolling is 828 DEG C.
(7) cold bed is cooling：The specification that step (6) is obtained is for 70mm bar with cooling velocity 15 in cold bed insulation cover
DEG C/min slowly cools to 600 DEG C, then to carry out cold bed air-cooled for the insulation cover out, finally obtains finished product bar.
Under the rolling process, 20CrMnTi rolled tissue is ferrite+pearlite, bar product mechanical property
As shown in table 4.
4 embodiment 4 of table prepares the mechanical performance of product
Embodiment 5
The zerolling production method of high-performance 20CrMnTi pinion steel provided in this embodiment, required finished product 20CrMnTi
The specification of steel grade is 60mm, is included the following steps：
(1) heating steel billet：Will 300 × 400 × 9000mm continuous casting billet cutting after using it is red send mode be put into heating furnace into
Row heats again, wherein the mass percent of each content ingredient is in continuous casting billet：C：0.191；Si：0.184；Mn：1.005；
Cr：1.024；Ti：0.057；P：0.015；S：0.012；Al：0.023；N：0.0052；Remaining is Fe, and mass fraction amounts to
100%；
600 DEG C of the temperature of preheating section, 1000 DEG C of temperature of one section of heating；1050 DEG C of temperature of two sections of heating, soaking zone
1110 DEG C of temperature；Total heating time in the heating process is 3h, and the soaking time of soaking zone is 40min；
(2) descaling of steel stock：Use high-pressure water descaling with removing iron scale, the pressure of high pressure water on the steel billet after heating
26MPa；
(3) roughing steel billet：Steel billet after de-scaling is sent into high rigidity roughing mill (6 frame) progress roughing and obtains roughing strip plate；
Roughing inlet temperature is 985 DEG C, and roughing passage is 6 passages.
(4) Continuous mill train tandem rolling：The roughed bloom that step (3) is obtained is sent into Continuous mill train, in roll inlet temperature be 905
DEG C, middle mill train time is 6 passages, and pre- exit temperature at finishing is 945 DEG C, and pre- finishing pass is 6 passages.
(5) Water cooling：Stocking after pre- finish rolling is subjected to Water cooling；Temperature is cooled to 700 DEG C；Water cooling speed is 80
DEG C/s, hydraulic pressure 0.5MPa.
(6) KOCKS is rolled：The stocking that specification 75mm is obtained after pre- finish rolling is subjected to KOCKS rolling, obtaining specification is 60mm
Bar；The inlet temperature of KOCKS rolling is 825 DEG C.
(7) cold bed is cooling：The specification that step (6) is obtained is for 60mm bar with cooling velocity 12 in cold bed insulation cover
DEG C/min slowly cools to 600 DEG C, then to carry out cold bed air-cooled for the insulation cover out, finally obtains finished product bar.
Under the rolling process, 20CrMnTi rolled tissue is ferrite+pearlite, bar product mechanical property
As shown in table 5.
5 embodiment 5 of table prepares the mechanical performance of product
Embodiment 6
The present embodiment compared with Example 1 other than heating steel billet system is different, other process conditions all with embodiment 1
It is identical.Step (1) heating steel billet system is referring to table 6 in the present embodiment；Finished product bar 20CrMnTi rolled tissue be ferrite+
Pearlite, bar product mechanical property are as shown in table 7.
Heating steel billet system in 6 embodiment 6 of table
7 embodiment 6 of table prepares the performance of product
Embodiment 7
The present embodiment compared with Example 1 other than Water cooling system is different, other process conditions all with embodiment 1
It is identical.Step (5) Water cooling system is as follows in the present embodiment：Stocking after pre- finish rolling is subjected to Water cooling；Temperature is cooling
To 765 DEG C；Water cooling speed is 30 DEG C/s, hydraulic pressure 0.20MPa；
The present embodiment finished product bar 20CrMnTi rolled tissue is ferrite+pearlite, bar product mechanical property
As shown in table 8.
8 embodiment 7 of table prepares the mechanical property of product
Embodiment 8
The present embodiment compared with Example 1 other than KOCKS rolling pattern is different, other process conditions all with embodiment
1 is identical.Step (6) KOCKS rolling pattern is as shown in table 9 in the present embodiment.
The KOCKS rolling pattern of 9 embodiment 8 of table
| The inlet temperature of KOCKS rolling | |
| Embodiment 8-1 | 790℃ |
| Embodiment 8-2 | 840℃ |
The finished product bar 20CrMnTi rolled tissue that the present embodiment obtains is ferrite+pearlite, bar product power
It is as shown in table 10 to learn performance.
10 embodiment 8 of table prepares the mechanical property of product
Although preferred embodiments of the present invention have been described, but engineering personnel in the art can be to these embodiments
Make other change and modification.So appended claims should be interpreted that including preferred embodiment and fall into model of the present invention
All change and modification enclosed.
The zerolling production method of high-performance 20CrMnTi pinion steel provided by the invention, method is unique, using this
Production method can produce the excellent 20CrMnTi pinion steel of comprehensive mechanical property, while also greatly reducing the heating furnace energy and disappearing
Consumption, had not only saved production cost but also had protected natural environment.
Claims (10)
1. a kind of zerolling production method of high-performance 20CrMnTi pinion steel, which is characterized in that with 20CrMnTi continuous casting billet
For raw material, the production method is successively comprised the following steps：Heating, de-scaling, roughing, tandem rolling, Water cooling, bar reducing sizing mill
Group finish rolling, cold bed are cooling, finally obtain finished product bar.
2. according to claim 1 in rolling production method, which is characterized in that in the heating process, to the continuous casting billet
It is heated, the temperature of soaking zone is 1100~1150 DEG C, and the soaking time of the soaking zone is 30~80min.
3. according to claim 1 in rolling production method, which is characterized in that in the heating process, it is divided into four sections of heating,
It is followed successively by preheating section, one section of heating, heating two sections and soaking zone；Wherein,
Temperature≤800 DEG C of the preheating section；
1000~1050 DEG C of temperature of one section of the heating；
1050~1100 DEG C of temperature of two sections of the heating；
1100~1150 DEG C of the temperature of the soaking zone；
Preferably, total heating time in the heating process is 3~5h, and the soaking time of the soaking zone is 30~80min；
It is highly preferred that the heating process carries out in four sections of walking beam furnaces.
4. according to claim 1 in rolling production method, which is characterized in that in the de-scaling process, removed using high pressure water
Squama is with removing iron scale, 25~30MPa of pressure of the high pressure water；Preferably 28~30MPa.
5. according to claim 1 in rolling production method, which is characterized in that in the roughing operation, inlet temperature 980
~1050 DEG C, roughing passage is 5~7 passages；Preferably, totally 6 frame, roughing passage are roughing mill used in the roughing operation
6 passages.
6. according to claim 1 in rolling production method, which is characterized in that the tandem rolling process include in roll process and pre-
Finishing rolling step, obtains fitting into the supplied materials of bar reducing-sizing mill after tandem rolling, it is described in roll the inlet temperature of process be 900~
950 DEG C, middle mill train time is 5~7 passages；In the pre- finishing rolling step, pre- essence passage is 3~5 passages, and pre- exit temperature at finishing is
870-950℃；Preferably, it is rolled in described and milling train in 6 framves is set altogether in process, the pre- essence of 4 framves is set altogether in the pre- finishing rolling step
Milling train, the middle mill train time are 6 passages, and the pre- finishing pass is 4 passages.
7. according to claim 1 in rolling production method, which is characterized in that in the Water cooling process, after tandem rolling
Supplied materials be cooled by water to 700~750 DEG C；Preferably, the water cooling speed of the Water cooling is 35~100 DEG C/s, and hydraulic pressure is
0.2~0.6MPa.
8. according to claim 1 in rolling production method, which is characterized in that the bar reducing-sizing mill finishing rolling step
In, inlet temperature is 800~830 DEG C；Preferably, the bar reducing-sizing mill finish rolling is KOCKS rolling.
9. according to claim 1 in rolling production method, which is characterized in that the specific method of the cold bed cooling process
For：The bar obtained after bar reducing-sizing mill finish rolling is slowly cooled to 600 DEG C by first choice in cold bed insulation cover, then institute out
It is air-cooled to state insulation cover progress cold bed；Preferably, the cooling velocity of the Slow cooling is≤15 DEG C/min.
10. according to claim 1 in rolling production method, which is characterized in that the finished product bar specification be 50~
100mm。
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