CN109913635A - The integrated approach of steel plate quenching Strip Shape Control - Google Patents
The integrated approach of steel plate quenching Strip Shape Control Download PDFInfo
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Abstract
The invention discloses a kind of integrated approaches of steel plate quenching Strip Shape Control, comprising steps of (1) incoming profile controls；(2) steel plate carries out ball blast technique；(3) heating and quenching based on temperature uniformity；(4) strength cold leveling completes steel plate quenching Strip Shape Control.The present invention has carried out the research of expansion for the control of ultra-thin superelevation wide specification Quenching Sheet shape by force, in conjunction with live actual production conditions and plate shape generation mechanism.Comprehensively consider the influence factors such as ball blast technique, quenching technical, water model and other processes, carries out comprehensive research and field application.
Description
Technical field
The invention belongs to field of metallurgy more particularly to a kind of ultra-thin superelevation, wide specification steel plate quenches the integrated of Strip Shape Control by force
Method.
Background technique
It can stablize the production that batch carries out such product, there is certain supporting role, mesh to iron and steel enterprise's benefit
The ton steel wool benefit benefit of preceding estimated ultra-thin superelevation wide specification steel plate by force is at 1000 yuan or more.
For cut deal, ultra-thin width specification steel plate is commonly defined as thickness less than 8mm and greater than 4mm, is different from
Hot steel rolling production, steel plate of the width in 2.0-5.0m.Wide specification steel plate is a kind of very with market potential to ultra-thin superelevation by force
Product, product mainly have steel for engineering machinery, low-temperature storage tank steel, military project plate, super intensified abrasion-proof steel, structure of container steel etc.,
Wherein most all has to pass through quenched production, and as thickness reduces, width increases, ton steel wool benefit is skyrocketing.It can stablize
Batch carries out the production of such product, has certain supporting role to iron and steel enterprise's benefit.
Wide specification steel plate is presently mainly to have bottleneck in terms of Strip Shape Control to ultra-thin superelevation by force, needs the multiple work in front and back road
Skill is saved, and higher cost seriously restricts it and high-volume produces, especially in the ultra-thin wide gauge steel of the biggish 6mm or less of production difficulty
Plate.Its control difficulty is big, and first-time qualification rate is not high.Because wide specification steel plate production difficulty is big by force for ultra-thin superelevation, to equipment, water mould
The requirement of type and its later process is high, thus ultra-thin dimension board Quenching Sheet shape thinking seek to comprehensively consider it is related because
Element.Chinese Patent Application No.: 201110183566.9 " a kind of cooling wide cooling devices controllable to uniformity of strip ", only emphatically
Equipment itself introduces control steel plate width direction uniformity；A kind of and Chinese Patent Application No.: 201810147766.0 " ultra-thin rule
The process for quenching of lattice wear-resisting steel plate " then control uniformity only is considered from quenching technical process.So to sum up, it is cooling equal in control
Due to considering that emphasis is different in terms of even property, all there is emphasis in terms of controlling thinking.But in actual production process, scene is raw
Production condition be it is sufficiently complex, often not single impact factor works to Quenching Sheet shape, but the reflection of synthesis result.Institute
With must be able to from more comprehensively, in conjunction under scene production conditions, going to consider how control cooling uniformity and plate shape.
Summary of the invention
Goal of the invention: the present invention provides a kind of integrated approaches of steel plate quenching Strip Shape Control, overcome piece in the prior art
Face, monistic defect, can the influence factor of wide specification steel plate and plate shape generation mechanism be very by force by the ultra-thin superelevation of produced on-site
It combines well, comprehensively considers each factor and its reciprocation and later period correction process matched therewith, ensure ultra-thin superelevation wide specification by force
The till soleplate shape of steel plate.
Technical solution: the integrated approach of steel plate quenching Strip Shape Control of the invention, comprising the following steps:
(1) steel plate carries out ball blast technique, and wherein pellet material selects shot, shot blasting velocity 55-65m/s, pellet diameters
0.9-1.1mm, strike 45 ° of angle, steel plate transport speed 4-5.5m/min；It is preferred that 4.2-5.2m/min.
(2) steel plate after completion ball blast technique is subjected to non-oxidation quenching, wherein hardening heat is 890-910 DEG C, when total
Between 55-70min；The type of cooling takes the strategy of fast and stable and big yield, and water amount parameters are roll gap 4-9mm, be above lauched than for
1:1.2-1.6, hydraulic pressure 0.5-0.8MPa, 26-28 DEG C of water temperature, roller speed 0.45-0.55m/s, total Water 3000-4500m3/min。
(3) strength cold leveling, the correction of 2-4 passage integrated reciprocating formula, preferably 3 passages are carried out to quenched steel plate.It is i.e. complete
At steel plate quenching Strip Shape Control.Final plate shape measurement is met the requirements.
In step (1), to ultra-thin superelevation, wide dimension board ball blast technique parameter regulates and controls by force, and realization is symmetrically and evenly slowly beaten
It hits, wide specification steel plate is to the contained characteristic of stress by force for ultra-thin superelevation, so to the uniformity and its sensitivity of strike, while steel plate is thick
The iron scale removal of the degree plane of symmetry is also to have an impact to heating temperature uniformity.Ball blast principle: steel plate transport is at a slow speed, pellet beats
Hit quick, 45 ° of angle of strike, material is the small pellet of the high diameter of hardness, such as shot.
In step (2), using black box data, reasonable heating cycle is formulated, guarantees the strong wide plate temperature difference of ultra-thin superelevation ± 5
DEG C, the temperature averages of each even buried position of 20min steel plate guarantee the ultra thin plate temperature difference at ± 5 DEG C at 900 ± 4.5 DEG C before coming out of the stove.
Carry out the research of water model based on analogue technique, and then reasonable water model is set, the water of the work setting based on development
Model parameter.
The test of black box furnace temperature is can to characterize steel plate actual temperature and furnace temperature difference and steel plate three-dimensional temperature is equal
The most straightforward approach of even property is formulated ultra-thin wide plate heating process system in conjunction with black box measured data, can effectively be considered
Ultra thin plate bulk temperature field distribution situation when heated.
In addition, water factor of a model is arranged are as follows: roll gap setting range increases 0- on the basis of thickness for ultra thin plate
2mm, preferred parameter are that roll gap is 4.3-8.7mm, are above lauched than for 1:1.3-1.5, hydraulic pressure 0.6-0.8MPa.
The type of cooling is using fast and stable and the strategy of big yield: 1 group of narrow slit type nozzle turn-on flow rate 1800-2000m3/
Min, other highly dense rapid cooling nozzles of 6 groups of unlatching are cooling, total flow 1200-2500m3/ min guarantees quickly through the narrow of big flow
Slot nozzle cooling zone.Because the ultra-thin cooling sensibility of width dimension board is big, cooling velocity is exceedingly fast, can be quickly through phase transformation when cooling
Point causes transformation stress larger.So the phase transformation collaboration for needing quick big yield to keep all directions changes, to keep good
Plate shape.
Because ultra-thin wide specification steel plate is mainly quick big yield refrigerating mode, so narrow slit type nozzle is that its is most crucial cold
But module guarantees that narrow slit type nozzle precision is to guarantee its cooling uniformity and the most important basis of plate shape, and thinking is based on super
The control method of thin plate three-dimensional temperature uniformity, the narrow slit type nozzle Aperture precision meet precision in 1.92-2.02mm
The demand of ± 0.1mm.
In step (3), cooperation strength cold straightener is corrected, this be in fact it is very necessary, at present many production lines because
Earlier design does not consider strength cold leveling line after configuration is quenched, so failing to play effective correcting to deformed steel strip after quenching
Effect.The straightening process of strength cold straightener is carried out choosing whether to correct by practical plate shape condition.
It is ultra-thin superelevation wide specification steel plate by force, yield strength 960MPa, thickness 4.0- that above-mentioned steel plate, which is applicable in steel grade,
8.0mm, width 2.0-5.0mm.
Wherein, further include the steps that carrying out heating destressing correction using tempering furnace before the steel plate quenching.Guarantee quenching
Enter stokehold incoming profile: to it is to be quenched enter furnace plate shape it is poor utilize tempering furnace carry out low-temperature heat destressing correction, plate shape survey
Amount is in 15-18mm/m；Using tempering furnace in 300-350 DEG C of heating, time inside furnace 0.5-1h；It comes out of the stove core temperature correction to be lightly loaded, eliminates
Stress.Through measuring, Strip Shape Control is in 9.5-10mm/m.
Steel-plate shape unevenness described in preceding road is greater than 15mm/m or more, while being not more than 30mm/m or more.Unevenness is greater than
15mm/m or more can bring thickness direction temperature unevenness though can enter non-oxidation roller bottom glowing furnace when heated,
Influence the temperature uniformity of other both directions.Unevenness is greater than 15mm/m or more simultaneously, and steel plate impeller blasting effect cannot be guaranteed,
Iron scale strike is uneven, can equally influence temperature uniformity when heated, cannot get so as to cause subsequent cooling uniformity
Guarantee.It is worth noting that, incoming profile value in 30mm/m or more, will cause into tempering furnace difficulty, it is not achieved and disappears in advance
The effect of de-stress.
The utility model has the advantages that the 1, present invention has carried out grinding for expansion for the control of ultra-thin superelevation wide specification Quenching Sheet shape by force
Study carefully, in conjunction with live actual production conditions and plate shape generation mechanism.Comprehensively consider ball blast technique, quenching technical, water model and its
The influence factors such as his process carry out comprehensive research and field application；By mechanism study and controls and take scene into consideration
Full-range impact factor.Using innovative method, such as in the actual measurement of temperature uniformity even buried, water model multiple-factor orthogonal function
The method that value simulation calculates, and front and back procedure is combined and conducts a research and controls, it can be true, reliable and comprehensively to super
Wide specification steel plate quenching cooling uniformity is regulated and controled thin superelevation by force, can be directly the strong wide rule of ultra-thin superelevation in actual production process
The control of lattice steel-plate shape provides reference.
Detailed description of the invention
Fig. 1 illustrates utilize black box to test the practical oven temperature profile of steel plate in the present invention；
Fig. 2 illustrates different water cooling curves in the present invention；
Fig. 3 illustrates the cooling curve in the present invention under differential roller speed；
Fig. 4 illustrates the cooling curve in the present invention under different coolant water temperatures；
Fig. 5 is light plate width direction cooling water inflow distribution schematic diagram of the present invention；
Fig. 6 illustrates the narrow slit type nozzle Aperture precision of actual measurement in the present invention.
Specific embodiment
Embodiment 1
The integrated approach of steel plate quenching Strip Shape Control, comprising the following steps:
(1) steel grade is yield strength 960MPa high-strength steel；Thickness 6mm；Width 4.0m.
(2) guarantee to quench into stokehold incoming profile: plate shape measurement is in 18mm/m；Using tempering furnace in 350 DEG C, time inside furnace
1h；It comes out of the stove core temperature correction to be lightly loaded, eliminates stress.Through measuring, Strip Shape Control is in 10mm/m.
(2) adjust ball blast technique: pellet material selects shot, shot blasting velocity 60m/s, pellet diameters 1mm, strike angle
45 °, steel plate transport speed 4.2m/min.
(3) furnace Control for Kiln Temperature at heat: black box even buried thermometric is carried out to non-oxidation glowing furnace, hardening heat is 900 DEG C, always
Under the process conditions of time 65min, the temperature averages of each even buried position of 20min steel plate are protected at 900 ± 4.5 DEG C before coming out of the stove
The ultra thin plate temperature difference is demonstrate,proved at ± 5 DEG C.
(4) cooling technique controls:
A) water model cootrol: carry out the research of water model based on analogue technique, and then reasonable water model is set；Base
In the water model parameter of the work setting of development are as follows: roll gap is set as 6.8mm；On be lauched than being set as 1:1.4, hydraulic pressure setting
In 0.8MPa, 26 DEG C of water temperature, roller speed 0.5m/s, total Water 3500m3/min.
B) type of cooling: 1 group of narrow slit type nozzle opens maximum stream flow 2000m3/min, other open 6 groups of highly dense rapid cooling sprays
It is blunt but, total flow 1500m3/min, guarantee quickly through big flow narrow slit type nozzle cooling zone.
(5) equipment precision controls: being controlled based on ultra thin plate three-dimensional temperature uniformity, is replaced to narrow slit type nozzle
Its Aperture precision range meets the needs of precision ± 0.1mm in 1.92-2.02mm afterwards.
(6) correct after quenching: measuring plate shape cooperates strength cold leveling in 4mm/m after quenching, matches steel plate thickness 6.0mm,
Carry out the correction of 3 passage integrated reciprocating formulas.
(7) final plate shape measurement is met the requirements in 3.0mm/m.
Embodiment 2
The integrated approach of steel plate quenching Strip Shape Control, comprising the following steps:
(1) steel grade is the anti-wear steel NM360 that yield strength is 1150MPa；With a thickness of 8mm；Width 2.0m.
(2) guarantee to quench into stokehold incoming profile；Plate shape measurement is in 10mm/m；It is practical not carry out correcting into stokehold destressing
Measure.
(3) adjust ball blast technique: pellet material selects shot, shot blasting velocity 56m/s, pellet diameters 1.1mm, strike angle
45 °, steel plate transport speed 4.5m/min.
(4) furnace Control for Kiln Temperature at heat: black box even buried thermometric is carried out to non-oxidation glowing furnace, hardening heat is 895 DEG C, always
Under the process conditions of time 70min, the temperature averages of each even buried position of 20min steel plate are protected at 895 ± 4.0 DEG C before coming out of the stove
The ultra thin plate temperature difference is demonstrate,proved at ± 5 DEG C.
(5) cooling technique controls:
A) water model cootrol: carry out the research of water model based on analogue technique, and then reasonable water model is set；Base
In the water model parameter of the work setting of development are as follows: roll gap is set as 8.7mm；On be lauched than being set as 1:1.3, hydraulic pressure setting
In 0.8MPa, 28 DEG C of water temperature, roller speed 0.45m/s, total Water 4500m3/min.
B) type of cooling: 1 group of narrow slit type nozzle opens maximum stream flow 2000m3/min, other 8 groups highly dense rapid cooling nozzles are total
Flow 2500m3/min guarantees quickly through the narrow slit type nozzle cooling zone of big flow and first group of highly dense fast cold-zone.
(6) equipment precision controls: being controlled based on ultra thin plate three-dimensional temperature uniformity, is replaced to narrow slit type nozzle
Its Aperture precision range meets the needs of precision ± 0.1mm in 1.92-2.02mm afterwards.
(7) correct after quenching: measuring plate shape meets final Quenching Sheet shape demand in 1.5mm/m after quenching, does not carry out strength
Cold leveling.
Embodiment 3
The integrated approach of steel plate quenching Strip Shape Control, comprising the following steps:
(1) steel grade is the high-strength steel that yield strength is 960MPa；With a thickness of 4.0mm；Width 3.5m.
(2) guarantee to quench into stokehold incoming profile: plate shape measurement is in 11mm/m；It is practical not carry out correcting into stokehold destressing
Measure.
(3) adjust ball blast technique: pellet material selects shot, shot blasting velocity 65m/s, pellet diameters 0.9mm, strike angle
45 °, steel plate transport speed 5.2m/min.
(4) furnace Control for Kiln Temperature at heat: black box even buried thermometric is carried out to non-oxidation glowing furnace, hardening heat is 910 DEG C, always
Under the process conditions of time 55min, the temperature averages of each even buried position of 15min steel plate are protected at 910 ± 5.0 DEG C before coming out of the stove
The ultra thin plate temperature difference is demonstrate,proved at ± 5 DEG C.
(5) cooling technique controls:
A) water model cootrol: carry out the research of water model based on analogue technique, and then reasonable water model is set；Base
In the water model parameter of the work setting of development are as follows: roll gap is set as 4.3mm；On be lauched than being set as 1:1.5, hydraulic pressure setting
In 0.6MPa, 26 DEG C of water temperature, roller speed 0.55m/s, total Water 3000m3/min.
B) type of cooling: 1 group of narrow slit type nozzle opens maximum stream flow 1800m3/min, other open 4 groups of highly dense rapid cooling sprays
It is blunt but, total flow 1200m3/min, guarantee quickly through big flow narrow slit type nozzle cooling zone.
(6) equipment precision controls: being controlled based on ultra thin plate three-dimensional temperature uniformity, is replaced to narrow slit type nozzle
Its Aperture precision range meets the needs of precision ± 0.1mm in 1.92-2.02mm afterwards.
(7) correct after quenching: measuring plate shape cooperates strength cold leveling in 6.5mm/m after quenching, matches steel plate thickness
4.0mm carries out the correction of 3 passage integrated reciprocating formulas, result 5.5mm/m, and carries out secondary strength cold leveling.Final plate shape measurement
In 3.0mm/m, meet the requirements.
Embodiment 4
The integrated approach of steel plate quenching Strip Shape Control, comprising the following steps:
(1) steel grade is the abrasion-resistant stee NM400 that yield strength is 1260MPa；Steel plate thickness is 4.75mm；Width 3.5m.
(2) guarantee to quench into stokehold incoming profile: plate shape measurement is in 15mm/m；Using tempering furnace in 300 DEG C of temperature, in furnace
Time 0.5h；It comes out of the stove core temperature correction to be lightly loaded, eliminates stress.Through measuring, Strip Shape Control is in 9.5mm/m.
(3) adjust ball blast technique: pellet material selects shot, shot blasting velocity 58m/s, pellet diameters 1.1mm, strike angle
45 °, steel plate transport speed 5.0m/min.
(4) furnace Control for Kiln Temperature at heat: black box even buried thermometric is carried out to non-oxidation glowing furnace, hardening heat is 900 DEG C, always
Under the process conditions of time 60min, the temperature averages of each even buried position of 15min steel plate are protected at 900 ± 4.2 DEG C before coming out of the stove
The ultra thin plate temperature difference is demonstrate,proved at ± 5 DEG C.
(5) cooling technique controls:
A) water model cootrol: carry out the research of water model based on analogue technique, and then reasonable water model is set；Base
In the water model parameter of the work setting of development are as follows: roll gap is set as 5.1mm；On be lauched than being set as 1:1.35, hydraulic pressure is set
It sets in 0.8MPa, 26 DEG C of water temperature, roller speed 0.48m/s, total Water 3800m3/min.
B) type of cooling: 1 group of narrow slit type nozzle opens maximum stream flow 1800m3/min, other open 5 groups of highly dense rapid cooling sprays
It is blunt but, total flow 2000m3/min, guarantee quickly through the narrow slit type nozzle cooling zone of big flow and the 1st group of highly dense rapid cooling.
(6) equipment precision controls: being controlled based on ultra thin plate three-dimensional temperature uniformity, is replaced to narrow slit type nozzle
Its Aperture precision range meets the needs of precision ± 0.1mm in 1.92-2.02mm afterwards.
(7) correct after quenching: measuring plate shape cooperates strength cold leveling in 5.5mm/m after quenching, matches steel plate thickness
4.75mm carries out the correction of 3 passage integrated reciprocating formulas.Final plate shape measurement is met the requirements in 3.2mm/m.
The principle of optimality of technological parameter in above-described embodiment:
In step (4), the test of black box furnace temperature is can to characterize steel plate actual temperature and furnace temperature difference and steel plate three-dimensional
The most straightforward approach of direction temperature uniformity formulates ultra-thin wide plate heating process system in conjunction with black box measured data, can be with
Effectively consider ultra thin plate bulk temperature field distribution situation when heated.Fig. 1 is the Temperature Distribution that scene is obtained using black box
Curve.It can parse steel plate three-dimensional Uniformity of Temperature Field characteristic in this way.
Include multiple-factor in cooling jig in the considerations of step (5) cooling jig parameter setting, is most crucial in cooling
Parameter setting.It is a kind of method of novelty using the method for analog simulation, the portion that test can be unable to characterize or be detected
It is intrinsic to be characterized, it in this way by the affecting laws of the fastidious cooling factor, is finely adjusted, can reach preferable in conjunction with scene
Effect.The multiple-factor that Fig. 2-4 can be calculated for simulation influences and the thermo parameters method of each position of steel plate.Pass through such side
Method can effectively obtain the influence degree of each factor, provide most direct guidance for the formulation of water model.
It is found by calculating, the type of cooling is selected as fast and stable and big yield, because ultra-thin width dimension board cooling is quick
Perceptual big, cooling velocity is exceedingly fast, and transformation stress can be caused larger quickly through transformation temperature when cooling.So needing quick flood
Amount keeps the phase transformation of all directions to cooperate with transformation, to keep good plate shape.
In the control of step (6) equipment precision: because ultra-thin wide specification steel plate is mainly quick big yield refrigerating mode, so narrow
Slot nozzle is its most crucial refrigerating module, guarantees that narrow slit type nozzle precision is to guarantee that its cooling uniformity and plate shape are most important
Basis, thinking is the control method based on ultra thin plate three-dimensional temperature uniformity.Fig. 5 is steel plate width cooling uniformity
Water distribution, Fig. 6 be for a long time use actual measurement narrow slit type nozzle accuracy value.Equipment precision can occur after long-time service
Variation, can generate the even property of inhomogeneous cooling of steel plate three-dimensional, so periodic maintenance and replacement are needed, after guaranteeing replacement precision
Precision is in ± 0.1mm, i.e., 5% tolerance.
After the step (7) is quenched in correction: wide specification steel plate finally meets the requirement of plate shape such as the following table 1 institute to ultra-thin superelevation by force
Show.
Claims (7)
1. a kind of integrated approach of steel plate quenching Strip Shape Control, which comprises the following steps:
(1) steel plate carries out ball blast technique, and wherein pellet material selects shot, shot blasting velocity 55-65m/s, pellet diameters 0.9-
1.1mm, strike 45 ° of angle, steel plate transport speed 4-5.5m/min；
(2) steel plate after completion ball blast technique is subjected to non-oxidation quenching, wherein hardening heat is 890-910 DEG C, total time 55-
70min, the type of cooling take the strategy of fast and stable and big yield, and water amount parameters are roll gap 4-9mm, are above lauched than for 1:1.2-
1.6, hydraulic pressure 0.5-0.8MPa, 26-28 DEG C of water temperature, roller speed 0.45-0.55m/s, total Water 3000-4500m3/min；
(3) strength cold leveling is carried out to quenched steel plate, the correction of 2-4 passage integrated reciprocating formula completes steel plate quenching plate
Shape control.
2. integrated approach according to claim 1, it is characterised in that: the steel plate yield strength is 960MPa, thickness
4.0-8.0mm, width 2.0-5.0mm.
3. integrated approach according to claim 1, it is characterised in that: further include before the steel plate quenching using tempering furnace into
The step of row heating destressing correction.
4. integrated approach according to claim 1, it is characterised in that: steel-plate shape unevenness described in preceding road is greater than 15mm/
M, while being not more than 30mm/m.
5. integrated approach according to claim 1, it is characterised in that: in step (2), water amount parameters are that roll gap is 4.3-
8.7mm is above lauched than for 1:1.3-1.5, hydraulic pressure 0.6-0.8MPa.
6. integrated approach according to claim 1, it is characterised in that: in step (2), the type of cooling uses 1 group of slit
Nozzle turn-on flow rate 1800-2000m3/ min, other highly dense rapid cooling nozzles of 6 groups of unlatching are cooling, total flow 1200-2500m3/min。
7. integrated approach according to claim 6, it is characterised in that: the narrow slit type nozzle Aperture precision is in 1.92-
2.02mm。
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