CN107779762A - A kind of enamel steel plate and its manufacture method with excellent high temperature deformation performance - Google Patents
A kind of enamel steel plate and its manufacture method with excellent high temperature deformation performance Download PDFInfo
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- CN107779762A CN107779762A CN201610772364.0A CN201610772364A CN107779762A CN 107779762 A CN107779762 A CN 107779762A CN 201610772364 A CN201610772364 A CN 201610772364A CN 107779762 A CN107779762 A CN 107779762A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/003—Cementite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention discloses a kind of enamel steel plate with excellent high temperature deformation performance, its chemical element mass percent is：C：0.03~0.06%, Si：0.01~0.50%, Mn：0.5~1.2%, 0 ＜ S≤0.035%, Al：0.005~0.05%, N：0.0055~0.010%, Ti：0.19~0.25%, Mo：0.10~0.20%, Nb≤0.03%, surplus are Fe and other inevitable impurity；The enamel microstructure of steel plate has ferrite and a TiN particles as precipitated phase, and the surfaces of the TiN particles is in plane, formed with irreversible small hole between the TiN particles and surface ferrite crystal grain in curved surface.Correspondingly, the invention also discloses a kind of manufacture method of described enamel steel plate.
Description
Technical field
The present invention relates to a kind of steel plate and its manufacture method, more particularly to a kind of enamel steel plate and its manufacture method.
Background technology
Enamel technique is exactly that the nature of glass enamel containing high silicon dioxide component is coated in after machine-shaping
Steel matrix surface, then after high temperature sintering enamel be firmly bonded to steel matrix surface formed composite one kind add
Work process, this composite have the Common advantages such as the stability of glass and the intensity of steel, have good wearability, to each
Kind acid, alkali, organic solvent have preferable corrosion resistance.Enamel technique is mainly used in glass-lined equipment and enamel accessory
Such as glassed steel reaction vessels, enamel storage tank, enamel glass stirrer are fabricated, is widely used in petrochemical industry, system doctor's pharmacy etc.
Industry.Glass-lined equipment, first by steel plate machine-shaping, welding and surface treatment, is applied afterwards during processing and manufacturing
Ward off and sinter.Typically to be burnt till during enamel firing by the application of slip repeatedly and high temperature of 7~9 times, to reach enough enamel layer thickness, disappear
Except enamel coating surface defect, ensure enamel quality, the temperature burnt till is up to 870~930 DEG C.
Enamel is most still with the ordinary construction such as Q235 and Q245R, Q345R steel plate and pressure vessel with steel at present
Based on steel plate, the design and use target of these steel plates is not intended to the purposes such as glass-lined equipment, and the composition characteristic of its steel is to contain
Carbon amounts is higher (C ＞ 0.12%), and alloying element content is very low, and its microstructure is based on ferrite+pearlite.For
In the manufacture of glass-lined equipment, on the one hand lacking storage hydrogen trap, easily to produce squama quick-fried, simultaneously because phosphorus content height produces in enamel firing
The excessive excessive bubble structure that easily causes of raw bubble is bad, damages enamel coating quality；On the other hand, due to multiple high temp to be passed through
Burn till, after heating repeatedly, cooling procedure is subjected to, the dissolving and transformation (phase transformation) of pearlite continually occurs, easily produces
The deformation of steel plate body, the quality for severely impacting product even result in product rejection.
The hot rolled steel plate of enamel steel is main big using addition in order to improve the fish scaling resistance of steel plate in the prior art
The titanium of amount, and improve Ti/C ratio, for example, Ti mass percent be 0.09~0.20%, Ti/C ratios be 1.5~
3.0, or even Ti/C ratios are up to 5~15 etc..Purpose using this kind of method is that a large amount of tiny TiC particles are formed in steel,
Turn into storage hydrogen trap by TiC particles, to prevent the generation squama during the application of slip quick-fried.However, because TiC particles are being heated to
It more than 800 DEG C and can largely dissolve during long-time heat preservation, be separated out in subsequent slow cooling and agglomeration, so as to steel plate
Hydrogen storage capacity brings uncertainty.Further, since pearlitic structrure in steel be present, with the dissolving and transformation (phase transformation) of pearlite
Frequently generation, steel plate also easily produces high temperature deformation.
Because of this it may be desirable to obtain a kind of enamel steel plate, it has high temperature deformation resistance performance, can meet in high temperature shape
Under state repeatedly enamel firing without produce deformation.
The content of the invention
An object of the present invention is to provide a kind of enamel steel plate with excellent high temperature deformation performance, and it has
There is excellent application of slip performance, while also there is excellent high temperature deformation resistance performance.
Based on foregoing invention purpose, the invention provides a kind of enamel steel with excellent high temperature deformation performance
Plate, its chemical element mass percent are：
C：0.03~0.06%, Si：0.01~0.50%, Mn：0.5~1.2%, 0 ＜ S≤0.035%, Al：0.005~
0.05%, N：0.0055~0.010%, Ti：0.19~0.25%, Mo：0.10~0.20%, Nb≤0.03%, surplus Fe
With other inevitable impurity；
The enamel microstructure of steel plate has ferrite and the TiN particles as precipitated phase, the TiN particles
Surface be in plane, formed with irreversible small hole between the TiN particles and surface ferrite crystal grain in curved surface.
Of the present invention with the enamel steel plate of excellent high temperature deformation performance, other are inevitably miscellaneous
Matter is primarily referred to as phosphorus, thus, impurity element P mass percent is limited to≤0.035%.
Inventor is had found in thermal deformation processing, during enamel firing by largely testing and testing
High-temperature firing repeatedly, due to being influenceed by factors such as phase transformation, recrystallizations, be hardly formed around tiny precipitated phase it is substantial amounts of,
Permanent storage hydrogen trap.The raw substantial amounts of irreversible storage hydrogen trap in view of thermal deformation process is relatively had difficult labour, therefore hot-working steel plate
The quick-fried phenomenon of squama is more prone in the application of slip.Come it is pointed out that hot-working steel plate only relies on the substantial amounts of alloying element of addition
Substantial amounts of second phase particles are separated out also to be difficult to fundamentally improve its fish scaling resistance.
In consideration of it, inventor is had found based on this, while enamel steel is fully taken into account to scaling resistance, adherence
Property, the matching requirement of the combination property such as anti-needle pore defect and intensity, plasticity, toughness and weldability, in alloying element and processing
After substantial amounts of research and experimental contrast analysis have been carried out in terms of the matching of technological parameter, by being closed to each chemical composition of steel
Reason is designed to utilize the synergy of each chemical element, and creativeness proposes the mass percent for controlling each chemical element, especially
It is Ti and N mass percent, to obtain the relatively fine TiN particles of precipitated phase, and is formed using the particle irreversible
Store hydrogen trap.The surface of the TiN particles is in plane, is formed between the TiN particles and surface ferrite crystal grain in curved surface
There is irreversible small hole.Because described TiN particles are all even to be separated out at high operating temperatures in molten steel, and in heat
It is substantially insoluble in process, and most TiN particles will not be also dissolved in firing range, therefore, this
Slightly small hole is beneficial irreversible storage hydrogen trap.
It should be noted that in the technical program, the precipitated phase for forming storage hydrogen trap is not limited in TiN, handles TiN
In addition, other precipitated phases form storage hydrogen trap, such as complex chemical compound (Ti, Nb) (C, N).In another example in ball
The TiS and TiC of shape particle, but the storage hydrogen trap effect of these precipitates is good without TiN.Particularly TiC, due to its precipitation
It is relatively low with solution temperature, influenceed by hot-working and high temperature enamel firing technique big, the storage hydrogen trap served is restricted.
And enamel of the prior art with steel by control Ti/C ratio (as control Ti/C in the range of 1~4) from
And TiC particles are separated out, and storage hydrogen trap is formed around its particle, this causes prior art following defect to be present：Form storage hydrogen
Trap is more difficult, and because TiC precipitations or solution temperature are relatively low so that the storage hydrogen trap that it is formed is easily by hot-working or height
The influence that temperature is burnt till is notable, causes fluctuation and the variation of hydrogen storage performance.And technical solutions according to the invention pass through TiN particles institute
The small hole formed overcomes drawbacks described above as irreversible storage hydrogen trap, is used so as to improve enamel of the present invention
The fish scaling resistance of steel plate, and then ensure that the application of slip performance of steel plate.
Of the present invention with the enamel steel plate of excellent high temperature deformation performance, steel plate is by repeatedly in height
Temperature is lower to be sintered, and the decline of its yield strength is less, and reflecting steel plate has preferable resistance capacity to deformation.
Enamel of the present invention is with the design principle of each chemical element of steel plate：
Carbon：Carbon is to ensure that the key element of armor plate strength, the mass percent increase of carbon, and intensity rises, plasticity and toughness
Decline.Carbon and titanium generation TiC particles, can not only strengthen matrix, reduce the pearlitic structrure in steel, and to improving the storage of steel
Hydrogen Energy power is also helpful.The mass percent of carbon is less than 0.03%, and the amount of precipitated phase is less, causes the intensity of steel too low, but
When the mass percent of carbon is higher than 0.06%, it is unfavorable for improving the high temperature deformation of steel.Therefore, used in enamel of the present invention
The mass percent of the carbon of steel plate is limited to 0.03~0.06%.But as described above, due to the enamel technique of steel
During temperature is high, time length, and to pass through and repeatedly be repeated so that the phase transformation of steel and recrystallize and the weight of TiC particles
Molten and precipitation is within the temperature range of being close, so that TiC particles are extremely unstable in steel, therefore the present invention also passes through it
The composition design of his element obtains stable, effective small hole as storage hydrogen trap.
Silicon：Silicon plays solution strengthening effect in steel, while silicon can also improve the high temperature deformation resistance ability of steel, for improving
Heatproof shock property between steel and the enamel coating of the application of slip is also favourable.In general, steel plate is passing through blasting treatment, is warding off the normal of ground-coat enamel
Under technique, excellent adhesion property can be ensured completely.But the mass percent of silicon can be to the plasticity of steel and tough higher than 0.50%
The performances such as property are unfavorable, are also unfavorable for welding.Therefore, the mass percent control of the silicon of enamel steel plate of the present invention exists
0.01~0.50%.
Manganese：Manganese is to strengthen matrix element, therefore the purpose for adding manganese essentially consists in the intensity for improving steel, but the quality hundred of manganese
When dividing than being higher than 1.2%, the plasticity of steel can be seriously reduced.In addition, manganese is in steel and reaction of Salmon-Saxl generates manganese sulfide, the sulphur of general steel
It is in hairline shape to change manganese, extremely harmful to the horizontal plastic property and toughness of steel plate, however, in enamel steel plate of the present invention
In, due to there is an addition of appropriate titanium, manganese is mainly separated out with spherical (Mn, Ti) S, it is entirely avoided the precipitation of simple manganese sulfide and
It is adversely affected.In consideration of it, enamel of the present invention is limited to 0.5-1.2% with the mass percent of the manganese of steel plate.
Sulphur：Sulphur is the element of the plasticity and toughness of damaging steel plate, however, in technical solutions according to the invention, alloy
Element ti can form compound with C, S and N.The technical program is come by forming comparatively fine TiN particles and TiS particles
Form irreversible storage hydrogen trap.Therefore, enamel of the present invention is defined to 0 ＜ S with the mass percent of sulphur in steel plate
≤ 0.035%.
Aluminium：Aluminium is strong deoxidant element, because oxygen and titanium react easily in molten steel and forms field trash, consumes effective titanium,
Therefore, it is necessary to add aluminium, deoxidation is carried out, so as to reduce the oxygen content in steel.The aluminium of enamel steel plate of the present invention
Mass percent control controls Als≤0.05% 0.005~0.05%.
Nitrogen：In technical solutions according to the invention, alloying element Ti can form compound with C, S and N.This technology side
Case is by forming comparatively fine TiN particles and TiS particles, to form irreversible storage hydrogen trap.Therefore, it is of the present invention
Enamel is defined to the mass percent of nitrogen in steel plate：0.0055~0.010%.
Titanium and niobium：Titanium and niobium are all strong carbon, nitride forming element.Compared with titanium, niobium and nitrogen separate out to be formed in high temperature
NbN, and more stable precipitated phase, but its particle size is thinner than TiN, can avoid thick TiN adverse effect.With this
Meanwhile niobium can also form tiny NbC particles with carbon, the intensity of steel can be improved.Therefore, add titanium and on the one hand niobium ensures
There are enough second phase particles to separate out, on the other hand can also avoid the formation of more thick TiN particles.In addition, unnecessary titanium
It can be reacted with carbon, generate relatively fine TiC particles.In consideration of it, the Ti of enamel steel plate of the present invention matter
The mass percent that percentage control is measured in 0.19~0.25%, Nb is controlled below 0.03%.
Molybdenum：Molybdenum is advantageous to improve the adherence between steel and glass enamel coating, can also improve the high temperature resistant deformability of steel.
But mass percent is too high to increase cost.Therefore, the mass percent of molybdenum limits in enamel steel plate of the present invention
For 0.10~0.20%.
Further, in enamel steel plate of the present invention, it also contains B：0.0005~0.005%.
In enamel steel plate of the present invention, addition boron element can further improve the fish scaling resistance of steel,
Further, it is also possible to improve the intensity of steel.However, addition boron element also improves Ac3 temperature, it is therefore, of the present invention to ward off
Glass is defined to 0.0005~0.005% with the mass percent of boron in steel plate.
Further, in enamel steel plate of the present invention, it meets Ti+ (48/93) × Nb >=4 × C+3.43
× N+1.5 × S, wherein Ti, Nb, C, S and N represent the mass percent of corresponding element respectively；The microstructure, which also has, to be made
For the TiS particles of precipitated phase, the TiS particles are spherical in shape, and the TiS particles are used to form irreversible small hole.
In order to further improve the combination property of steel, its fish scaling resistance, plasticity and toughness, this case invention are especially improved
People has carried out further restriction to the synergy each chemical element in this case technical scheme, its meet Ti+ (48/93) ×
Nb >=4 × C+3.43 × N+1.5 × S, wherein Ti, Nb, C, S and N represent the mass percent of corresponding element respectively.It designs former
Manage and be：Alloying element Ti can form compound with C, S and N in steel.Typically, since the Precipitation Temperature of TiN particles is high,
The thick plasticity and toughness that can damage steel of grain.Thus, avoid or reduce the precipitation of TiN particles by reducing the mass percent of nitrogen.
However, in the inventive solutions, in order to improve the performance of steel, inventor is further by controlling above-mentioned element collaboration to close
System, so as to limit the precipitation quantity and temperature to form TiN and TiS, allows it to separate out comparatively fine TiN particles and TiS grains
Son (catercorner length or diameter are not more than 4 μm).The hard phase TiN that can separate out these high temperature is brought using this kind of mode
And TiS, TiS particle is mainly in spherical, it is there is also gap between matrix, while as TiN, TiS particles are in hot-working
During it is substantially insoluble, therefore it can also form small hole between the matrix of steel, that is, store hydrogen trap.Burnt even in corresponding
Most TiN and TiS particle granules will not be also dissolved in into temperature range.Meanwhile to slab before hot-working
By improving heating-up temperature and extending soaking time when being heated so that the part dissolving of TiN particle granules, particularly
TiN preferentially at its grain corner or peripheral part dissolving, TiN particle granules is attenuated, to improve steel plasticity and toughness have
Profit, while the part TiN particle granules dissolved can separate out more tiny particle, also extremely have to increasing storage hydrogen trap afterwards
Profit, so as to improve the fish scaling resistance of steel.In addition, N, S mass percent can form substantial amounts of field trash when too high.
In addition, the formula also helps strong carbon, the nitride forming element such as the titanium for causing sufficient amount and niobium, it is almost completely solid
The carbon and nitrogen in steel are determined, have not had more carbon particularly and form pearlitic structrure, so by suppressing pearlitic structrure
Generation, avoids causing the high temperature of steel plate due to pearlite Solid State Transformation repeatedly during hot procedure and high temperature enamel firing
Deformation.
Further, in enamel steel plate of the present invention, it meets 0.02%≤Cu+Cr+Ni≤0.20%.
In order to further improve enamel steel plate of the present invention, technical solution of the present invention further defines alloy
The addition of element, it meets 0.02%≤Cu+Cr+Ni≤0.20%, because：Copper, chromium, nickel：It is the residual elements in steel,
Because these elements deposit in surface of steel plate, the adherence of the enamel of steel can be influenceed by the influence to surface film oxide.
The residual quantity of these elements (brings) fluctuation bigger in the steel scrap used when such as smelting, to ripple caused by enamel plate property
It is dynamic also bigger, it is unfavorable to the stability of raising enamel performance.Therefore, enamel steel plate of the present invention by copper, chromium with
And nickel is defined to：0.02%≤Cu+Cr+Ni≤0.20%.
Further, in enamel steel plate of the present invention, the TiN particles are in square or cuboid.
Further, in enamel steel plate of the present invention, its microstructure is ferrite or ferrite+carburizing
Body.
Due to not containing pearlite in technical solutions according to the invention, thus avoid due to pearlite dissolving and turn
Become (phase transformation) and cause the deformation for producing steel plate body, make enamel steel plate of the present invention that there is excellent high temperature deformation
Performance.
Further, in enamel steel plate of the present invention, its yield strength >=295MPa, tensile strength >=
400MPa, elongation percentage >=26%.
Another object of the present invention is to provide a kind of manufacture method of above-mentioned enamel steel plate, it includes step successively
Suddenly：
(1) smelt and cast；
(2) hot rolling：Heating-up temperature before strand rolling is 1150~1250 DEG C, soaking time=t × (0.5~1.5), its
Middle t is slab thickness, and unit mm, the unit of soaking time is min；Control 1100~1200 DEG C of roughing rolling temperature, deformation
Amount >=50%；Water-spraying control after roughing, it is 920~1000 DEG C to control finish rolling start rolling temperature, and finishing temperature is 870~920 DEG C,
Deflection >=60%；
(3) cool down.
In the manufacture method of the enamel steel plate of the present invention with excellent high temperature deformation performance, in order to protect
Card enamel is unlikely to deform with steel plate in high temperature, and therefore, manufacture method control technological process of the present invention is particularly hot
Each technological parameter during rolling, make steel plate that there is ferrite and the TiN particles as precipitated phase, the surface of the TiN particles
In plane, formed with irreversible small hole between the TiN particles and surface ferrite crystal grain in curved surface.
In step (2), strand rolling before heating-up temperature for 1150~1250 DEG C and soaking time=t × (0.5~
1.5), wherein t is slab thickness, and unit mm, the unit of soaking time is min, be because：It is on the one hand to obtain uniformly
The austenite structure of change, on the other hand the compound of titanium is partly dissolved.Wherein, the calculation of soaking time is：For example,
Slab thickness is 230mm, then soaking time is 115~345min.
In addition, 1100~1200 DEG C of the control roughing rolling temperature in step (2), deflection >=50%, is for hot rolling
Process is carried out in austenite recrystallization section, so as to pass through repeat-rolling fining austenite grains.
At the same time, in step (2), water-spraying control after roughing, it is 920~1000 DEG C to control finish rolling start rolling temperature,
Finishing temperature is 870~920 DEG C, deflection >=60%, it is ensured that phase transformation can be sufficiently completed after rolling.It is meanwhile logical
Cross and use deflection >=60% so that form substantial amounts of small hole in TiN particle peripheries.
In step (3), cooling can take water cooling or slow cooling.Further, in manufacture method of the present invention,
In the step (3), average cooldown rate≤10 DEG C/s is controlled.
In manufacture method of the present invention, control average cooldown rate≤10 DEG C/s, be because：In cooling procedure
In, the titanium and carbon of solid solution can be separated out in the form of compound, be evenly distributed in small and dispersed state in matrix, so as to reduce
The transformation of pearlite and aggregation are in blocks, and by controlling cooldown rate, the ferritic structure in steel is refined.It is in addition, cold
But speed is higher than 10 DEG C/s, and the compound for being unfavorable for titanium is fully separated out, and residual stress can be formed in steel, causes to cause group
The problems such as knitting inequality.Therefore, the average cooldown rate≤10 DEG C/s of step (3) control in manufacture method of the present invention.
Further, in manufacture method of the present invention, in addition to step (4) normalizing：Normalizing temperature be 930~
980℃。
Due in finishing temperature, the ferritic structure in steel is difficult to ensure that as uniform equiax crystal, in order to obtain more preferable property
Can enamel steel plate, step (4) normalizing can be added, so that the Carbide Precipitation in steel is more abundant, and can be with
Ferritic structure is homogenized, the residual stress of inside is completely eliminated.
Enamel steel plate of the present invention with excellent high temperature deformation performance with good fish scaling resistance,
It is unlikely to deform at high temperature.In addition, enamel of the present invention has higher intensity, good plasticity and welding with steel plate
Property, the glass-lined equipment and accessory high particularly suitable for making the confrontation quick-fried performance requirement of squama.
The manufacture method of enamel steel plate of the present invention with excellent high temperature deformation performance is equally with upper
State advantage and beneficial effect.In addition, described manufacturing approach craft flow is simple, and saves manufacturing cost.
Brief description of the drawings
Fig. 1 is the micro-organization chart of the enamel steel plate with excellent high temperature deformation performance of the embodiment of the present invention 1.
Fig. 2 show the enamel of the embodiment of the present invention 1 with steel plate by 900 DEG C × 10min+ air cooling → 950 DEG C ×
Metallographic structure after 10min+ air cooling → 870 DEG C × 10min+ air coolings (during 870 DEG C × 10min continuous 5 times processing) coprocessing 7 times
Photo.
Embodiment
There is excellent high temperature deformation performance to of the present invention below in conjunction with brief description of the drawings and specific embodiment
Enamel made further explanation with steel plate and its manufacture method, but the explanation and illustration not to the present invention
Technical scheme forms improper restriction.
Embodiment 1-7
Steel plate in above-described embodiment and comparative example is made using following step：
(1) smelt and cast；
(2) hot rolling：Heating-up temperature before strand rolling is 1150~1250 DEG C, soaking time=t × (0.5~1.5), its
Middle t is slab thickness, and unit mm, the unit of soaking time is min；Control 1100~1200 DEG C of roughing rolling temperature, deformation
Amount >=50%；Water-spraying control after roughing, it is 920~1000 DEG C to control finish rolling start rolling temperature, and finishing temperature is 870~920 DEG C,
Deflection >=60%；
(3) cool down：Average cooldown rate≤10 DEG C/the s of control.The type of cooling can use water-spraying control or slow cooling.
It should be noted that in embodiment 2 and 7, in order to further improve the performance of steel, in addition to step (4) normalizing：
Normalizing temperature is 930~980 DEG C.
Table 1 lists the percent mass proportioning of each chemical element of the enamel steel plate of each embodiment.
Table 1. (wt%, surplus are Fe and the other impurities element in addition to impurity element P)
Table 2 lists the specific process parameter of the manufacture method of each embodiment.
Table 2
To the enamel with excellent high temperature deformation performance obtained by the above method with carrying out every mechanical property survey
Examination and Hot Deformation Performance test, the correlation performance parameters that experiment measures are listed in Table 3 below.The method of testing used for：
The application of slip is tested, and the glaze of we selected typical is carried out, and two-sided full parcel wet-process enamelling, using a ground-coat enamel and a cover-coat enamel, burns till work
Skill is according to the regulation of glaze, and ground-coat enamel firing temperature is at 930~950 DEG C, and cover-coat enamel firing temperature is at 870~900 DEG C.
Table 3 lists the mechanical property of each embodiment and the yield strength after multiple enamel firing.
Table 3
*：Simulation enamel firing technique to 16mm steel plates：900 DEG C × 10min+ air cooling → 950 DEG C × 10min+ air coolings →
870 DEG C × 10min+ air coolings (continuous 5 processing during 870 DEG C × 10min)；To 20~24mm steel plates, keeping temperature is constant, phase
The time inside furnace answered extends to 15min；To 30mm steel plates, corresponding time inside furnace extends to 20min.
From table 3 it can be seen that each embodiment steel plate of this case yield strength >=345MPa, tensile strength >=
449MPa, elongation >=30%, illustrate that each embodiment enamel steel plate of this case possesses higher intensity and good stretching
Ductility.
In addition, as can also be seen from Table 3, adherence level of the enamel steel plate without the quick-fried phenomenon of squama, and ground-coat enamel described in this case
Do not reach I levels, thus there is good application of slip performance, in addition it can also be seen that warding off glass described in the technical program from table 3
Glass steel plate repeatedly after the enamel firing under above-mentioned high temperature, the numerical value of its yield strength than original steel plate yield strength simultaneously
Do not occur significantly gliding, this illustrates that the enamel steel plate has excellent high temperature deformation resistance ability.
Fig. 1 is the micro-organization chart of the enamel steel plate with excellent high temperature deformation performance of the embodiment of the present invention 1.
From figure 1 it appears that the enamel of embodiment 1 is ferrite with the microstructure of steel plate, and in ferrite base
TiN particles are distributed with body.
Fig. 2 shows that the enamel of this case embodiment 1 passes through 900 DEG C × 10min+ air cooling → 950 DEG C × 10min with steel plate
Metallographic structure photo after+air cooling → 870 DEG C × 10min+ air coolings (during 870 DEG C × 10min continuous 5 times processing) coprocessing 7 times.
From figure 2 it can be seen that its microstructure is uniform, equiaxial ferritic structure, and ferrite crystal grain is big
Change before small and enamel firing is little, and this also illustrates steel plate has what high temperature resistance crystal grain was grown up after being burnt till by multiple high temp
Ability is favourable to improving or improving elevated temperature strength and deformability.
It should be noted that listed above is only specific embodiment of the invention, it is clear that real the invention is not restricted to more than
Example is applied, the similar change for having many therewith.If those skilled in the art directly exported from present disclosure or
All deformations associated, all should belong to protection scope of the present invention.
Claims (10)
- A kind of 1. enamel steel plate with excellent high temperature deformation performance, it is characterised in that its chemical element quality percentage Than for：C：0.03~0.06%, Si：0.01~0.50%, Mn：0.5~1.2%, 0 ＜ S≤0.035%, Al：0.005~ 0.05%, N：0.0055~0.010%, Ti：0.19~0.25%, Mo：0.10~0.20%, Nb≤0.03%, surplus Fe With other inevitable impurity；The enamel microstructure of steel plate has ferrite and the TiN particles as precipitated phase, the table of the TiN particles Face is in plane, formed with irreversible small hole between the TiN particles and surface ferrite crystal grain in curved surface.
- 2. enamel steel plate as claimed in claim 1, it is characterised in that it also contains B：0.0005~0.005%.
- 3. enamel steel plate as claimed in claim 1 or 2, it is characterised in that it meets Ti+ (48/93) × Nb >=4 × C+ 3.43 × N+1.5 × S, wherein Ti, Nb, C, S and N represent the mass percent of corresponding element respectively；The microstructure also has There are the TiS particles as precipitated phase, the TiS particles are spherical in shape, and the TiS particles are used to form irreversible small hole.
- 4. enamel steel plate as claimed in claim 1, it is characterised in that 0.02%≤Cu+Cr+Ni of its satisfaction≤ 0.20%.
- 5. enamel steel plate as claimed in claim 1, it is characterised in that the TiN particles are in square or cuboid.
- 6. enamel steel plate as claimed in claim 1, it is characterised in that its microstructure is ferrite or ferrite+ooze Carbon body.
- 7. enamel steel plate as claimed in claim 1, it is characterised in that its yield strength >=295MPa, tensile strength >= 400MPa, elongation percentage >=26%.
- 8. the manufacture method of the enamel steel plate as described in any one in claim 1-7, it includes step successively：(1) smelt and cast；(2) hot rolling：Heating-up temperature before strand rolling is 1150~1250 DEG C, soaking time=t × (0.5~1.5), wherein t For slab thickness, unit mm, the unit of soaking time is min；1100~1200 DEG C of control roughing rolling temperature, deflection >= 50%；Water-spraying control after roughing, it is 920~1000 DEG C to control finish rolling start rolling temperature, and finishing temperature is 870~920 DEG C, deformation Amount >=60%；(3) cool down.
- 9. manufacture method as claimed in claim 8, it is characterised in that in the step (3), the average cooldown rate of control≤ 10℃/s。
- 10. manufacture method as claimed in claim 8, it is characterised in that also including step (4) normalizing：Normalizing temperature be 930~ 980℃。
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