CN106756618B - 100mm thickness Q420GJC/D controlled rolling state high-strength structure steel plates - Google Patents
100mm thickness Q420GJC/D controlled rolling state high-strength structure steel plates Download PDFInfo
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0242—Flattening; Dressing; Flexing
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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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- 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
- C21D2211/009—Pearlite
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
The present invention relates to a kind of high-strength structure steel plates and preparation method thereof of 100mm thickness Q420GJC/D controlled rolling states delivery, chemical composition is, C0.14~0.17%, Si0.30~0.50%, Mn1.40~1.60%, P≤0.015%, S≤0.005%, Cr0.05~0.15%, Mo≤0.30%, Ni0.10~0.30%, Cu≤0.30%, Al0.02~0.04%, V0.10~0.14%, Nb0.04~0.07%, Ti0.01~0.02%, the surpluses of N≤0.006% are Fe, the Q420GJC/D trades mark of carbon equivalent 0.44~0.50%；Yield strength is 440~460MPa, and tensile strength is 570~610MPa, elongation >=21%；Yield tensile ratio≤0.83,20 DEG C V-type ballistic work >=80J.The same plate performance that the present invention produces thickness 100mmQ420GJC/D products is uniform, stable, and comprehensive performance is good.
Description
Technical field
The invention belongs to building structure special steel technical fields, and in particular to the Q420GJC/D high-strength steel sheets of 100mm thickness and
Preparation method.
Background technology
The steel plate of skyscraper requires superior shock resistance, environmentally protective, construction efficiency is high, space availability ratio is high etc.
Many-sided special feature, has become the developing direction of building structure in the world.But steel building has spy to steel used
Different technology requirement：Not only there are the performances such as easy welding, antidetonation, low-temperature impact resistance；Also the yield strength upper limit, tension are strong
The index requests such as degree high (compared with general carbon or low-alloy structural steel plate), carbon equivalent, yield tensile ratio.In recent years built large quantities of in China
Steel building greatly adapts to by the application of steel plate for tall building and supports building structure to high stratification and large span
The development of development.And the construction of large-span frame building, bridge etc. is more and more, the primary structure member of these structures often needs to use
The special thickness steel plate of 420MPa.
" a kind of 420MPa grades of normalizing state spy's think gauge structural steel plate and its manufacture of publication number CN103540848A invention
Method " produces 100~120mm special heavy plates using the thick continuous casting billet of 400mm spies, using acceleration after being heat-treated with strand rolling+normalizing
It is cooling.Production cycle is long, production cost is high, and the condition of delivery is normalizing.
" a kind of low yield strength ratio Q420GJ steel plate for building and its production method " of publication number CN105603310A invention.It is
80mm steel plates are produced with 300mm continuous casting billets, accelerate cooling i.e. controlled rolling and controlled cooling after rolling+roll using strand；It is the same as block product steel plate
The uniformity of performance is unstable, and difference is big, and production yield rate is low；And production thickness specification is limited as 80mm steel plates, the condition of delivery
For controlled rolling and controlled cooling (TMCP).
Invention content
The present invention uses the special thick continuous casting billet production 100mm thickness of 450mm, the condition of delivery for the Q420GJC/D of WCR (controlled rolling)
Steel plate, comprehensive performance are fully able to meet the customer requirement of GB/T 19879-2015 and steel plate for tall building.Use
The same plate performance of " continuous casting material+controlled rolling " technology, product is uniform, stable；It is with short production cycle, production cost is low.
Technical solution is used by the present invention solves the above problems：A kind of 100mm thickness Q420GJC/D controlled rolling state high intensity
The chemical composition of structural steel plate, the steel plate is C by mass percentage：0.14~0.17%, Si：0.30~0.50%,
Mn：1.40~1.60%, P：≤ 0.015%, S：≤ 0.005%, Cr：0.05~0.15%, Mo：≤ 0.30%, Ni：0.10~
0.30%, Cu：≤ 0.30%, Al：0.02~0.04%, V：0.10~0.14%, Nb：0.04~0.07%, Ti：0.01~
0.02%, N：≤ 0.006%, surplus is Fe and inevitable impurity element, carbon equivalent C+Mn/6+ (Cr+Mo+V)/5+ (Ni+
Cu the Q420GJC/D trades mark of)/15=0.44~0.50%；The condition of delivery is WCR controlled rolling states；Yield strength be 440~
460MPa, tensile strength are 570~610MPa, elongation >=21%；Yield tensile ratio≤0.83, -20 DEG C of V-type ballistic work >=80J.Steel
Plate comprehensive performance is entirely capable of meeting GB/T 19879-2015.
Steel plate metallographic structure is ferrite (F)+25-30% pearlite (B)；Grain size is 8.5-9.0 grades.
The main function for the smelting ingredient each element that the present invention designs:
C:C element is to form the solute element of interstitial solid solution in Fe, and solid solution strengthening effect exists more than other elements
The solute element of displaced type solid solution is formed in Fe.Solubility of the C in iron is very low, and with the decline of temperature and significantly under
Drop；But since C atoms have good diffusivity, the ag(e)ing process of formation that can make yield strength, resist in the solid solution of saturation
Tensile strength improve (this is because C in the tissue of steel in the form of cementite or pearlite in the presence of to generate prodigious phase transformation strong
Change)；But greatly reduce toughness.The present invention is ultra thick gauge, while needing to ensure armor plate strength, is had again centainly
Welding performance and low-temperature impact toughness；Therefore it is 0.14~0.17% by the C content control in steel.
Mn:Mn elements form the solute element of displaced type solid solution in Fe.Mn is mainly by the way that " Mn of solid solution has relatively strong
Solid solution strengthening effect, expand iron austenite region, Mn contents increase the toughness of steel is had a significant impact " etc. number of mechanisms,
Effectively improve the intensity of steel.The raising of intensity implies that pearlite relative quantity increases, solution strengthening and a degree of refinement
Caused by crystal grain.Therefore, mentality of designing of the invention is centered around on crystal grain thinning always, is 1.40~1.60% by Mn controls.
S：In humble steel alloy, the content of S, which improves, will be such that the plasticity of steel, toughness declines；It is therefore preferable that S contents to the greatest extent may be used
Can be low, it is too low to cause production cost surging.For this purpose, preferably S is 0.002-0.005%.
Nb:Crystal grain can be prevented to grow up when low-alloy steel heats；During the rolling process by strain inducing, the Nb's of precipitation
Carbon/nitrides precipitate prevents ausforming from recrystallizing, reaches crystal grain thinning on crystal boundary and dislocation；There is precipitation enhancement；
The microscopic structure of steel can be improved, improve performance.
V：V is other than having Nb characteristic of elements, when the compound additions of Nb-V, intensity than individually plus Nb it is high.It can make simultaneously
Austenite grain further refines, and keeps ferrite crystal grain after cooling more tiny, is conducive to the improvement of toughness.
Ti:It is to strengthen solid N element.In compound humble steel alloy, N preferentially will form TiN with Ti.TiN prevents heating
When AUSTENITE GRAIN COARSENING effect ratio Nb (CN) it is big；The TiN and VN being precipitated using high temperature prevent austenite recrystallization crystal grain thick
Change.
Si:Si does not form carbide in steel.But its solid solubility in iron is larger, the notable reinforced ferrite of energy, Gu
Molten reinforcing effect is higher than Mn.But when Si >=0.70%, then intensity increases, and toughness declines.Therefore control its content 0.30-0.50% models
In enclosing.
Ni:Ni is non-carbide former.It reduces the C content of eutectoid point, increases the volume fraction of pearlite, favorably
In raising intensity；Reduce Ar3Transformation, makes ferrite crystal grain attenuate, and improves toughness.
Cr:It is medium carbide former.The Cr in ferrite is dissolved in, solution strengthening is generated, improves the intensity of steel.
The preparation method of the application 100mm thickness Q420GJC/D controlled rolling state high-strength structure steel plates, technological process are to use
Molten iron and high-quality steel scrap by desulfurization is as raw material, and converter bottom, top blast are smelted, whole Argon, the deoxidation of LF stoves, desulfurization, removal
Refining and the RH stove degassing process of folder matter, adjusting component and temperature；Through wide thickness plate continuous casting machine constant temperature, constant speed and rational two cold work
Skill, solidification end produce 450mm blanks using dynamic soft-reduction, electromagnetic agitation；By the assembly rule of plate size, by blank
Scale；Offline heap slow cooling of blank 48 hours or more；The blank of finishing qualification is sent into Rolling production by the production schedule；Heater
Skill：The preheating section temperature of heating furnace：One section of 600-900 DEG C, heating temperature：Two sections of 1000-1180 DEG C, heating temperature：1200-
1250 DEG C, soaking zone temperature：1160-1230℃；Total time >=580 minute are heated, to ensure that the homogeneous heating of blank, blank exist
In stove each section should at the uniform velocity stepping, after blank is come out of the stove and in the operation of rolling, surface oxidation iron is removed through thick descaling mill and pickle line processor
Skin；Thick de-scaling and smart de-scaling hydraulic pressure >=20MPa；Rolling divides the two-stage：Roughing controlled rolling and finishing rolling control rolling, the control of roughing
System rolling：980-1100 DEG C of start rolling temperature waits for temperature thickness 180-200mm through 7-11 passes, before roughing in 5 passages at least
There are the drafts >=38mm or reduction ratio 10-18% of 2 passages；The controlled rolling of finish rolling：810 ± 20 DEG C of start rolling temperature after temperature,
Finishing temperature is 780-810 DEG C, through 5-7 passes, three accumulative reduction ratio >=35% after finish rolling；Direct sending heat after the completion of rolling
The machine of rectifying aligning, rolled piece heat rectify temperature >=550 DEG C；Cold bed natural cooling is sent later, and being cooled to 300-400 DEG C, then to turn offline heap slow
It is cold, heap slow cooling >=300 DEG C, time >=36 hour；It examines, shear, enter through flaw detection, apparent mass inspection, physicochemical property
Library.
The application is entirely capable of producing the Q420GJC/D steel plates that the thickness 100mm conditions of delivery are WCR (controlled rolling)；It is surrendered
440~460MPa of intensity, 570~610MPa of tensile strength, elongation >=21%；Yield tensile ratio≤0.83, -20 DEG C of V-type ballistic works
The high-strength building steel sheet product of >=80J.Its comprehensive performance is entirely capable of meeting GB/T 19879-2015 and Steels for High Rise Buildings
The customer requirement of plate.
Continuous casting material+controlled rolling is used for the production present invention of the special steel, watering (ACC) is not had to after rolling and is quickly cooled down
And the technology for using cold bed to naturally cool to 350 DEG C or so, the same plate performance of product are uniform, stable；It is with short production cycle, raw
It produces at low cost.
The present invention can meet skyscraper, high-rise building, large span stadiums, airport, conference and exhibition center and steel knot
The steel plate for building of the large-scale construction engineerings demand such as structure workshop；And production cost is reduced, shorten the manufacturing cycle.
Description of the drawings
Fig. 1 is the metallographic structure at 1/2 thickness of light plate of the embodiment of the present invention.
Specific implementation mode
Below in conjunction with attached drawing embodiment, present invention is further described in detail.
Using Jing Guo desulfurization molten iron and high-quality steel scrap blow smelting, whole Argon, LF stoves as raw material, converter bottom and furnace roof
Deoxidation, desulfurization, removal folder matter, adjusting component and temperature refining and RH stove degassing process；Finally obtain the weight percent of molten steel
Than to be basic element with Fe and include following elemental composition：C：0.14~0.17%, Si：0.30~0.50%, Mn：1.40~
1.60%, P：≤ 0.015%, S：≤ 0.005%, Cr：0.05~0.15%, Mo：≤ 0.30%, Ni：0.10~0.30%,
Cu：≤ 0.30%, Al：0.02~0.04%, V：0.10~0.14%, Nb：0.04~0.07%, Ti：0.01~0.02%, N：
≤ 0.006%, surplus is Fe and inevitable impurity element, the Q420GJC/D of carbon equivalent≤0.50%.
Molten steel is stirred through wide thickness plate continuous casting machine constant temperature, constant speed and rational two cold technique, solidification end dynamic soft-reduction, electromagnetism
It mixes and produces 450mm continuous casting materials.By the assembly rule of change release plate size, by blank scale；The offline heap slow cooling of blank
>=48 hours.The blank of finishing qualification is sent into Rolling production by the production schedule.Heating process：The preheating section temperature of heating furnace：
One section of 600-900 DEG C, heating temperature：Two sections of 1000-1180 DEG C, heating temperature：1200-1250 DEG C, soaking zone temperature：1160-
1230℃；Heat total time >=580 minute.To ensure that the homogeneous heating of blank, blank each section should at the uniform velocity steppings in stove.Blank
After coming out of the stove and in the operation of rolling, removing iron scale is removed through thick descaling mill and pickle line processor；Thick de-scaling hydraulic pressure >=20MPa (including essence
De-scaling).Rolling divides the two-stage：Roughing controlled rolling and finishing rolling control rolling.The controlled rolling of roughing：Start rolling temperature 980-1100
DEG C, through 7-11 passages, wait for temperature thickness 180-200mm.At least ensure 2 passages before roughing in 5 passages in the case where mill capacity allows, presses
Lower amount >=38mm or reduction ratio are in 10-18%.The controlled rolling of finish rolling：810 ± 20 DEG C of start rolling temperature, finishing temperature are after temperature
780-810 DEG C, open rolling and finishing temperature are close；Through 5-7 passes, three accumulative reduction ratio >=35% after finish rolling.It has rolled
It is aligned at rear direct sending heat rectification machine, rolled piece heat rectifys temperature >=550 DEG C；Cold bed natural cooling is sent later；Under being cooled to 350 DEG C or so then
Line heap slow cooling, heap slow cooling temperature >=300 DEG C, heap temperature retention time >=36 hour.Flaw detection, apparent mass inspection, physics and chemistry again
It can examine, shearing (cutting), be put in storage.
Embodiment
The steel plate chemical composition of the present embodiment design is C：0.16%, Si：0.42%, Mn：1.56%, P：0.012%, S：
0.003%, Cr：0.11%, Ni：0.18%, Al：0.029%, V：0.13%, Nb：0.056%, Ti：0.016%, surplus is
Fe and inevitable impurity element, the Q420GJC/D thickness 450mm continuous casting materials that carbon equivalent is 0.48%, production rolling 100mm
Thickness steel plate example.With 450 × 2300 × 3200mm of continuous casting billet, mill product plate 100 × 2500 × L (length) mm.Blank is cold
It is packed into heating furnace, the preheating section temperature of heating furnace：One section of 850-900 DEG C, heating temperature：Two sections of 1000-1100 DEG C, heating temperature
Degree：1210-1230 DEG C, soaking zone temperature：1200-1210℃；Heat 590 minutes total times.It is rolled after de-scaling, roughing is rolled
9 passages are made, wait for temperature thickness 200mm, rolls and at least ensures 2 passages in preceding 5 passage in the case where mill capacity allows, drafts >=38mm,
805 DEG C of finishing mill start rolling temperature after temperature, finish rolling is through 6 passes, 790 DEG C of finishing temperature, and rear three accumulative reduction ratios >=
35%；Rolled piece does not have to (watering be Acc) and accelerates cooling after the completion of rolling, and the natural cooling on cold bed, be cooled to 350 DEG C it is offline
Heap slow cooling；Sampling, physical and chemical inspection and quality inspection after 42 hours.Physicochemical property inspection result is shown in Table 1, metallographic structure (tissue
For：Ferrite (F)+25-30% pearlite (B)；Grain size is 8.5-9.0 grades, as shown in Figure 1.
Service check of the steel plate at 1/4,1/2 thickness the results are shown in Table 1
Table 1
" 450mm thickness continuous casting material+controlled rolling " technology of the present invention.Using 450mm thickness continuous casting billets, production is thick
The condition of delivery for spending 100mm is WCR (controlled rolling) Q420GJC/D steel plates for building, than using " steel ingot+normalizing heat treatment " or adopting
With the Q420GJC/D steel plates for building of " with acceleration cooling after continuous casting material+normalizing heat treatment " production, with short production cycle, production
It is at low cost；Process is few, operation facility；The yield strength 440-460MPa of product, 570~610MPa of tensile strength, elongation >=
21%；Yield tensile ratio≤0.83, -20 DEG C of V-type ballistic work >=80J；The same plate performance of product is uniform, stablizes, and comprehensive performance is entirely capable of
Meet the customer requirement of GB/T 19879-2015 and steel plate for tall building.
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiment
The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.
Claims (3)
1. a kind of 100mm thickness Q420GJC/D controlled rollings state high-strength structure steel plate, it is characterised in that：The chemical composition of the steel plate
It is C by mass percentage：0.14~0.17%, Si：0.30~0.50%, Mn：1.40~1.60%, P：≤ 0.015%,
S：≤ 0.005%, Cr：0.05~0.15%, Mo：≤ 0.30%, Ni：0.10~0.30%, Cu：≤ 0.30%, Al：0.02~
0.04%, V：0.10~0.14%, Nb：0.04~0.07%, Ti：0.01~0.02%, N：≤ 0.006%, surplus be Fe and
Inevitable impurity element, carbon equivalent C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15=0.44~0.50%
The Q420GJC/D trades mark；The condition of delivery is WCR controlled rolling states；Yield strength be 440~460MPa, tensile strength be 570~
610MPa, elongation >=21%；Yield tensile ratio≤0.83, -20 DEG C of V-type ballistic work >=80J；
The manufacturing process flow of steel plate, using Jing Guo desulfurization molten iron and high-quality steel scrap as raw material, converter bottom, top blast are smelted,
Whole Argon, the deoxidation of LF stoves, desulfurization, removal folder matter, adjusting component and temperature refining and RH stove degassing process；Connect through Wide and Thick Slab
Casting machine constant temperature, constant speed and rational two cold technique, solidification end produce 450mm blanks using dynamic soft-reduction, electromagnetic agitation；
By the assembly rule of plate size, by blank scale；Offline heap slow cooling of blank 48 hours or more；By the blank of finishing qualification by life
Production plan sends Rolling production；Heating process：The preheating section temperature of heating furnace：One section of 600-900 DEG C, heating temperature：1000-
Two sections of 1180 DEG C, heating temperature：1200-1250 DEG C, soaking zone temperature：1160-1230℃；Total time >=580 minute are heated, are
Ensure the homogeneous heating of blank, blank in stove each section should at the uniform velocity stepping, after blank is come out of the stove and in the operation of rolling, through thick descaling mill
Scale on surface is removed with pickle line processor；Thick de-scaling and smart de-scaling hydraulic pressure >=20MPa；Rolling divides the two-stage：Roughing control is rolled
System and finishing rolling control rolling, the controlled rolling of roughing：980-1100 DEG C of start rolling temperature waits for temperature thickness through 7-11 passes
180-200mm, before roughing in 5 passages at least 2 passages drafts >=38mm or reduction ratio 10-18%；The control of finish rolling is rolled
System：810 ± 20 DEG C of start rolling temperature after temperature, finishing temperature are 780-810 DEG C, through 5-7 passes, three accumulative pressure after finish rolling
Lower rate >=35%；Direct sending heat rectification machine is aligned after the completion of rolling, and rolled piece heat rectifys temperature >=550 DEG C；Cold bed natural cooling is sent later, it is cold
But then turn offline heap slow cooling, heap slow cooling >=300 DEG C, time >=36 hour to 300-400 DEG C；Through flaw detection, apparent mass
It examines, physicochemical property is examined, shearing, is put in storage.
2. 100mm thickness Q420GJC/D controlled rollings state high-strength structure steel plate according to claim 1, it is characterised in that：Steel
Plate comprehensive performance is entirely capable of meeting GB/T 19879-2015.
3. 100mm thickness Q420GJC/D controlled rollings state high-strength structure steel plate according to claim 1, it is characterised in that：Steel
Sheet metal phase constitution is ferrite (F)+25-30% pearlite (B)；Grain size is 8.5-9.0 grades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611057158.8A CN106756618B (en) | 2016-11-26 | 2016-11-26 | 100mm thickness Q420GJC/D controlled rolling state high-strength structure steel plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611057158.8A CN106756618B (en) | 2016-11-26 | 2016-11-26 | 100mm thickness Q420GJC/D controlled rolling state high-strength structure steel plates |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106756618A CN106756618A (en) | 2017-05-31 |
| CN106756618B true CN106756618B (en) | 2018-09-21 |
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| CN107385329B (en) * | 2017-06-30 | 2019-04-26 | 江阴兴澄特种钢铁有限公司 | A kind of big thickness Q500GJE high-strength building structural steel plate and its manufacturing method |
| CN107937811A (en) * | 2017-08-16 | 2018-04-20 | 新疆八钢铁股份有限公司 | Low temperature resistant 410MPa grades of steel plate for tall building of normalizing state |
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| CN112831724A (en) * | 2021-01-04 | 2021-05-25 | 南京钢铁股份有限公司 | S420 high-strength low-temperature structural steel and normalizing rolling preparation method thereof |
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