CN105750330B - A method of with asymmetric stainless steel composite billet hot rolling production stainless steel clad plate volume - Google Patents

A method of with asymmetric stainless steel composite billet hot rolling production stainless steel clad plate volume Download PDF

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Publication number
CN105750330B
CN105750330B CN201610197941.8A CN201610197941A CN105750330B CN 105750330 B CN105750330 B CN 105750330B CN 201610197941 A CN201610197941 A CN 201610197941A CN 105750330 B CN105750330 B CN 105750330B
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stainless steel
asymmetric
composite billet
rolling
temperature
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CN105750330A (en
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杜顺林
张晓锋
陈育生
张凤珍
赵知明
马红权
尹正培
史停停
邓增勇
王庭昆
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YUNNAN KUNGANG NEW COMPOSITE MATERIALS DEVELOPMENT Co Ltd
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YUNNAN KUNGANG NEW COMPOSITE MATERIALS DEVELOPMENT Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B3/00Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02Rolling special iron alloys, e.g. stainless steel
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/46Roll speed or drive motor control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58Roll-force control; Roll-gap control
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74Temperature control, e.g. by cooling or heating the rolls or the product
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2271/00Mill stand parameters
    • B21B2271/02Roll gap, screw-down position, draft position
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2275/00Mill drive parameters
    • B21B2275/02Speed
    • B21B2275/04Roll speed

Abstract

The present invention discloses a kind of method with asymmetric stainless steel composite billet hot rolling production stainless steel clad plate volume, and the surface stainless steel of asymmetric stainless steel composite billet is put into heating furnace upward;The preheating section temperature of rate-determining steps A heating furnaces and time in stove after preheating section, routinely carry out soaking zone heating;Again by asymmetric stainless steel composite billet after conventional dephosphorization, it is sent into roller diameter on working roll and is less than lower roller diameter, upper roller linear velocity more than the hot-rolling mill progress pair rolling of lower roll linear velocity, obtain composite plate;Composite plate after rolling is proceeded by into section cooling after 2~5m of strip head, then carries out conventional batch to get to asymmetric stainless steel Combined roll.The problems such as welding capacity of the present invention is small, and whole efficiency improves, and rolls and stablize, and loss rate of giving up is low, and there is no bulge, severe bends to stick up, discount, lumber recovery is high.The clad surface quality of the asymmetric stainless steel Combined roll of gained of the invention is high, to the low wear rate of equipment.

Description

A method of with asymmetric stainless steel composite billet hot rolling production stainless steel clad plate volume
Technical field
The present invention provides a kind of method with asymmetric stainless steel composite billet hot rolling production stainless steel clad plate volume, belongs to gold Belong to pressure processing technology field.
Background technology
Asymmetric stainless steel composite billet is that one block of stainless steel and one piece of straight carbon steel are superimposed together and welded to surrounding It connects processing and forms composite billet.Asymmetric stainless steel composite billet can make two kinds of raw material substrate metallurgy after heating, rolling processing It is combined together to obtain the new material with property.
Conventional stainless steel composite billet is the symmetrical assembly of boxlike, usually by four layers, six layers, the raw metals board groups such as eight layers At.By by four layers of raw metal board group at symmetrical stainless steel composite billet for, this four layers of raw metal plates are divided into two groups, one Zu Cheng bases raw material plate is made of cheap steel plates such as two blocks of carbon steel or low-alloy steel, one group claim cladding raw material plate by Two pieces of stainless steel plates are constituted, and four layers of raw metal plate are symmetrical along composite billet thickness direction median plane, i.e., base-cladding-is multiple Layer-base, without being welded and fixed between base's raw material plate and cladding raw material plate.
Symmetrical boxlike stainless steel composite billet is symmetrical along composite billet thickness direction median plane due to its raw material plate ingredient and performance Distribution and between base's raw material plate and cladding raw material plate without being welded and fixed, therefore this composite billet when heated will not be because of Base material is different from the linear expansion coefficient of plied timber and occurs being bent or bulge, in rolling will not because of carbon steel layer with not Elongation caused by the resistance of deformation difference for steel layer of becoming rusty is different and the phenomenon that composite billet is along its thickness direction severe bends occurs.
Since asymmetric stainless steel composite billet is superimposed together and right by two pieces of ingredients raw metal plate different with performance Surrounding carries out welding processing and forms, its ingredient of this composite billet and performance through-thickness median plane are in asymmetric distribution.Although Asymmetric stainless steel composite billet is compared with symmetrical boxlike stainless steel composite billet, with production process is simple, welding capacity is few, lumber recovery Height does not need many advantages, such as isolated material.But asymmetric stainless steel composite billet is when heated, if added using identical Thermal process heats stainless steel side and carbon steel side, then the thermal expansion amount of stainless steel and carbon steel will be because of the line of two kinds of materials The coefficient of expansion is different and difference occurs, and the relatively large stainless steel of thermal expansion amount is unable to free wxpansion by weld seam constraint can be in weld seam It is upper to generate larger shear stress.At this moment it will will appear two kinds of possible phenomenons, if shearing resistance of the weld seam under Current Temperatures is strong Degree is less than the shear stress suffered by weld seam, prevents composite billet from rolling then weld seam will crack;If weld seam is in Current Temperatures Under shearing strength be more than the shear stress suffered by weld seam, then the larger stainless steel of linear expansion coefficient will be because cannot be freely swollen It is swollen and " bulge " phenomenon occur and cause composite billet that cannot be rolled.
Further, asymmetric stainless steel composite billet rolling when, if without special control, stainless steel layer Elongation will because of stainless steel resistance of deformation more than carbon steel resistance of deformation and less than carbon steel elongation, this will make There are severe bends to surface stainless steel in composite billet, and the composite billet of severe bends can be difficult to bite roll also to be difficult to by rolling line, most Lead to rolling failure even damage rolling equipment eventually.The stainless of the condition of high temperature is obtained after the completion of asymmetric stainless steel composite billet hot rolling At this moment steel composite board needs feeding coiling machine after carrying out section cooling to high temperature composite plate to coil into Combined roll, the condition of high temperature Composite plate, since the larger stainless steel layer shrinkage of linear expansion coefficient is larger, can make composite plate head during being quickly cooled down Severe bends are generated to surface stainless steel, the head of bending, which cannot pass through laminar flow track, can not smoothly penetrate coiling machine, most It can cause to batch unsuccessfully because of piling of steel at last.
So it is necessary to do particular determination in the hot rolling production method of asymmetric stainless steel composite billet, to overcome above-mentioned ask Topic.
Invention content
The problems such as to solve asymmetric stainless steel composite billet weld cracking during heating, bulge, and rolling The problems such as bending in cooling procedure sticks up, discount, the present invention provides a kind of to be produced not with asymmetric stainless steel composite billet hot rolling The method that the steel composite board that becomes rusty is rolled up, effectively to solve the above problems.
The present invention is realized by following technical proposal:It is a kind of compound with asymmetric stainless steel composite billet hot rolling production stainless steel The method of coiled sheet, by following each step:
A, the big stainless steel one side of resistance of deformation in asymmetric stainless steel composite billet is put into heating furnace upward;This be by When being higher than temperature of lower in heating furnace internal upper part temperature, therefore stainless steel composite billet being packed into stove, stainless steel composite billet can be made The big stainless steel of middle resistance of deformation is when the temperature carbon steel small higher than resistance of deformation;
B, the preheating section temperature of rate-determining steps A heating furnaces is 550~700 DEG C, and makes asymmetric stainless steel composite billet pre- The time in stove of hot arc is 60~90min;This is because lower preheating section temperature, can make asymmetric stainless steel composite billet slow Heating, greatly reduces the thermal stress in weld seam and composite billet, avoids weld cracking and composite billet bulge;
C, the asymmetric stainless steel composite billet of step B routinely carries out bringing-up section, soaking zone after preheating section heats After heating, come out of the stove at being 1180 DEG C ~ 1240 DEG C in tapping temperature;
D, the asymmetric stainless steel composite billet after step C comes out of the stove is sent into hot-rolling mill and carries out pair rolling after conventional dephosphorization, The upper roller diameter of the hot-rolling mill working roll is less than lower 10~30mm of roller diameter, and the linear velocity of upper roller is more than lower roll linear velocity 1~7%, and control that start rolling temperature is 1100 DEG C ~ 1200 DEG C, finishing temperature is 850 ~ 930 DEG C, obtain stainless steel clad plate;
E, the stainless steel clad plate after step D rollings is proceeded by into conventional section cooling from after 2~5m of strip head, Later in the case where coiling temperature is 600 ~ 650 DEG C, carries out routine and batch, obtain asymmetric stainless steel Combined roll.2 before strip head~ 5m can be such that the rate of temperature fall on strip head greatly reduces without section cooling, will not thus go out because of thermal shrinking quantity difference The phenomenon that existing head severe bends.
The temperature phase of the soaking zone temperature of the step C and hot rolling heating temperature junior in asymmetric stainless steel composite billet Together.
When conventional hot rolling, either homogeneous material metal base or symmetrical stainless steel composite billet, the upper roller of working roll Diameter and lower roll all same.The upper roller diameter of the working roll of hot-rolling mill used in the present invention why be less than lower roller diameter 10~ 30mm, be because:For asymmetric stainless steel composite billet, because surface stainless steel is upper(Step A), it is desirable that the small purpose of upper roller It is to make the unit average pressure of surface stainless steel be more than carbon steel face.Stainless steel resistance of deformation is big, and carbon steel resistance of deformation is small, still Unit average pressure suffered by stainless steel is big compared with carbon steel, can thus solve the extension of stainless steel during the rolling process compared with carbon steel Small problem.Further, identical in other conditions, roller diameter is smaller, and deformed area area is smaller, and on roll-force is Under it is equal(Balance between two forces), so unit average pressure is bigger(It can be understood as pressure), metal deformation resistance is bigger, deformation Required average unit pressure is bigger.Apply larger unit average pressure in deformation to the big stainless steel of resistance of deformation, Apply smaller unit average pressure in deformation to the small carbon steel of resistance of deformation, can just make two kinds of metals in the operation of rolling in this way In elongation difference reduce, the problem of being just avoided that severe bends.
When conventional hot rolling, either homogeneous material metal base or symmetrical stainless steel composite billet, the upper roller line of working roll Speed extends because homogeneous material metal base material is uniform under identical roll linear velocity with lower roll linear velocity all same Identical, metal base can be straight after rolling;There is also two kinds of metals to prolong in fact in rolling for symmetrical stainless steel composite billet Different problems are stretched, but without being welded and fixed between this composite billet cladding and base, so two kinds of materials can freely prolong It stretches, the difference of elongation can't cause metal base to be bent.But for the asymmetric stainless steel composite billet of the present invention, it is necessary to The upper roller linear velocity for controlling working roll in hot-rolling mill is more than the 1~7% of lower roll linear velocity, this is because:Asymmetric stainless steel is compound The upper and lower layer material of base is different, and upper layer stainless steel resistance of deformation is big, and lower layer's carbon steel resistance of deformation is small, then will make upper roller line Speed is more than lower roll linear velocity, straight after just composite billet can in this way rolled, and solves the problems, such as severe bends.Further, become The carbon steel that the big stainless steel of shape drag rolls under higher roll linear velocity, resistance of deformation is small rolls under lower linear velocity System can just be such that two kinds of metal elongation differences reduce, solve the problems, such as severe bends.
Pair rolling is typically to begin to cool down from head, some can also reserve one section of head without cooling, but its Mechanism with the present invention claims head without section cooling be entirely different.The head of pair rolling can make after carrying out cooling The intensity of metal greatly increases, and will be difficult to batch after head enters coiling machine if thickness is larger, so some conventional gold Belong to plate rolling(When especially metal strength is higher or when rolling target thickness is larger)Also one section of head can be reserved without layer Stream cooling.The present invention be just carry out section cooling after the strip head of composite plate reserves 2~5m, this is because:For non- Symmetrical stainless steel composite billet, during the rolling process stainless steel realize that metallurgical binding is integrally formed at high temperature with carbon steel, laminar flow is cold When but, temperature drop is very big, and stainless steel is often different from the linear expansion coefficient of carbon steel, in this way, composite plate stainless steel layer shrinkage With regard to larger, strip steel head will be made to be bent to surface stainless steel, temperature drop is bigger, the degree of bending is also bigger.In addition, line expansion system The big material of number, shrinkage is also bigger under identical temperature drop;The line swell increment or shrinkage of material and temperature change at Therefore direct ratio will make change in temperature Δ t become larger, amount of bow also just becomes larger, and head will be tight if head carries out section cooling It is bent again, rolling line cannot be passed through or coiling machine cannot be entered.
The present invention has following advantages and effect:Compared with the production of the assembly of symmetrical stainless steel composite billet, the present invention The welding capacity of the asymmetric stainless steel composite billet provided greatly reduces, although rolling efficiency and symmetrical stainless steel composite billet phase Together, it after the completion of but being rolled due to symmetrical stainless steel composite billet, needs that special bundling production line is sent to carry out trimming, leads to bundling It is only 85% or so to produce lumber recovery.And after the completion of the asymmetric stainless steel composite billet rolling of the present invention, it is not necessarily to bundling, it only need to be After common finishing line carries out minimal amount of trimming, you can obtain lamination stainless steel clad plate finished product, whole efficiency carries significantly It is high.According to asymmetric stainless steel composite billet milling method provided by the invention, rolling is stablized, and loss rate of giving up is low, there is no bulge, The problems such as severe bends stick up, discount, the trimming amount after the rolling of asymmetric stainless steel composite billet is only that symmetrical stainless steel is compound The 1/4 of base trimming amount, lumber recovery greatly improves.Material is isolated without application in the surface of the asymmetric stainless steel Combined roll of gained of the invention Material, therefore avoid the phenomenon that plied timber is bonded up and down caused by due to isolated material is unevenly distributed and isolated material indentation cladding The problem that surface keeps surface quality bad, while when asymmetric stainless steel composite billet rolls, clad surface directly and roll contact, Clad surface quality is substantially increased, milling method of the invention will not carry out equipment belt additional abrasion.
Specific implementation mode
The present invention is described further with reference to example.
Embodiment 1
The asymmetric stainless steel composite billet that size is 5000mm*1600mm*110mm is rolled, the composite billet is by one piece SUS304 stainless steels and one piece of Q235 straight carbon steel form;Wherein, SUS304 stainless steels size be 5000mm*1600mm*10mm, Q235 straight carbon steel sizes are 5000mm*1600mm*100mm, and rolling target thickness is 12mm.
A, by material be the big SUS304 surface stainless steels of the asymmetric stainless steel composite billet resistances of deformation of Q235+SUS304 upward It is put into heating furnace;At room temperature, it is 235MPa that the yield strength of 304 stainless steels, which is 205MPa, Q235 straight carbon steel, but 1200 Under~900 DEG C of rolling temperature, the yield strength of straight carbon steel is reduced to 20~50MPa or so, and the yield strength of 304 stainless steels 40~70MPa or so is stilled remain in, the yield strength of Q235 is far longer than;304 stainless steel hot-rolling heating temperatures are 1200 ~1260 DEG C, straight carbon steel Q235 is 1150~1250 DEG C;
B, the preheating section temperature of rate-determining steps A heating furnaces is 560 ± 20 DEG C, and asymmetric stainless steel composite billet is made to preheat The time in stove of section is 60min;
C, the asymmetric stainless steel composite billet of step B routinely carries out bringing-up section, soaking zone after preheating section heats Heating is come out of the stove at being later 1240 DEG C in tapping temperature;The soaking zone temperature is 1250 DEG C;
D, it by the asymmetric stainless steel composite billet after step C heating after conventional dephosphorization, is sent into hot-rolling mill and carries out conventional roll It makes, a diameter of 776mm of upper roller, a diameter of 790mm of lower roll of the hot-rolling mill working roll, each rolling pass in the operation of rolling Reduction distribution, reduction ratio, upper working rolls and lower working rolls speed difference are as shown in table 1;And control that start rolling temperature is 1100 DEG C, finishing temperature is 900+/- 20 DEG C, obtain stainless steel clad plate;
E, the composite plate after step D rollings after the 3m of strip head is proceeded by into conventional section cooling, then rolled up It is to carry out routine at 600+/- 20 DEG C to batch to take temperature, obtains asymmetric stainless steel Combined roll.
Embodiment 2
Roll size be 150mm*1500mm*6000mm asymmetric stainless steel composite billet, the composite billet by one piece 316 not Become rusty steel and one piece of Q345 low-alloy steel composition, wherein SUS316 stainless steel sizes are the low conjunction of 6000mm*1500mm*20mm, Q345 Golden steel dimensions are 6000mm*1500mm*130mm, and rolling target thickness is 8mm.
A, by material be the big SUS316 surface stainless steels of the asymmetric stainless steel composite billet resistances of deformation of Q345+SUS316 upward It is put into heating furnace;At room temperature, it is 345MPa that the yield strength of SUS316 stainless steels, which is 205MPa, Q345 low-alloy steel, still Under 1200~900 DEG C of rolling temperature, the yield strength of straight carbon steel is reduced to 30~60MPa or so, and SUS316 stainless steels Yield strength still remain in 40~70MPa or so, be more than Q345 yield strength;Wherein 316 stainless steel hot-rollings heat Temperature is 1200~1260 DEG C, and straight carbon steel Q345 is 1150~1250 DEG C;
B, the preheating section temperature of rate-determining steps A heating furnaces is 620 ± 20 DEG C, and asymmetric stainless steel composite billet is made to preheat The time in stove of section is 80min;
C, the asymmetric stainless steel composite billet of step B routinely carries out bringing-up section, soaking zone after preheating section heats Heating is come out of the stove at being later 1150 DEG C in tapping temperature;The soaking zone heating temperature is 1200 ± 20 DEG C;
D, it by the asymmetric stainless steel composite billet after step C heating after conventional dephosphorization, is sent into hot-rolling mill and carries out conventional roll System, a diameter of 780mm of the hot-rolling mill working roll upper roller, a diameter of 800mm of lower roll, the pressure of each rolling pass in the operation of rolling Lower amount distribution, reduction ratio, upper working rolls and lower working rolls speed difference are as shown in table 2;And control that start rolling temperature is 1200 DEG C, finishing temperature is 900+/- 20 DEG C, obtain stainless steel clad plate;
E, the composite plate after step D rollings after the 4m of strip head is proceeded by into conventional section cooling, then rolled up It is to carry out routine at 620+/- 20 DEG C to batch to take temperature, obtains asymmetric stainless steel Combined roll.

Claims (1)

1. a kind of method with asymmetric stainless steel composite billet hot rolling production stainless steel clad plate volume, it is characterised in that by following Each step:
A, the surface stainless steel of asymmetric stainless steel composite billet is put into heating furnace upward;
B, the preheating section temperature of rate-determining steps A heating furnaces is 550~700 DEG C, and makes asymmetric stainless steel composite billet in preheating section Time in stove be 60~90min;
C, the asymmetric stainless steel composite billet of step B routinely carries out bringing-up section, soaking zone heating after preheating section heats Afterwards, it comes out of the stove at being 1180 DEG C ~ 1240 DEG C in tapping temperature;
D, the asymmetric stainless steel composite billet after step C comes out of the stove is sent into hot-rolling mill and carries out pair rolling after conventional de-scaling, described The upper roller diameter of hot-rolling mill working roll is less than lower 10~30mm of roller diameter, and the linear velocity of upper roller is bigger than lower roll linear velocity by 1~7%, And control that start rolling temperature is 1100 DEG C ~ 1200 DEG C, finishing temperature is 850 ~ 930 DEG C, obtain stainless steel clad plate;The step C Soaking zone temperature it is identical as the temperature of hot rolling heating temperature junior in asymmetric stainless steel composite billet;
E, the stainless steel clad plate after step D rollings is proceeded by into conventional section cooling from after 2~5m of strip head, later In the case where coiling temperature is 600 ~ 650 DEG C, carries out routine and batch, obtain asymmetric stainless steel Combined roll.
CN201610197941.8A 2016-03-31 2016-03-31 A method of with asymmetric stainless steel composite billet hot rolling production stainless steel clad plate volume Active CN105750330B (en)

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CN108637014B (en) * 2018-05-08 2019-11-22 攀钢集团西昌钢钒有限公司 A kind of very thin steel band process of hot rolling
CN111085547A (en) * 2019-12-25 2020-05-01 山东钢铁集团日照有限公司 Manufacturing method of asymmetric dissimilar material hot-rolled composite coil

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SU1212636A1 (en) * 1984-05-11 1986-02-23 Институт Металлургии Им.А.А.Байкова Asymmetric strip-rolling process
JPS623806A (en) * 1985-07-01 1987-01-09 Mitsubishi Heavy Ind Ltd Rolling method for clad steel
KR101274504B1 (en) * 2011-06-07 2013-06-13 강릉원주대학교산학협력단 Asymmetric processing apparatus, asymmetric processing method and materials processed using the apparatus or the method
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CN102553919B (en) * 2012-01-19 2014-04-23 河北钢铁股份有限公司承德分公司 Manufacturing method for producing single face stainless steel composite plate by adopting hot continuous rolling set
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CN105234177A (en) * 2015-09-30 2016-01-13 北京科技大学 Hot rolling method for restraining warping of asymmetrically-assembled titanium steel composite board

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