CN107385324B - A kind of big thickness Q500GJCD high-strength building structural steel plate and its manufacturing method - Google Patents
A kind of big thickness Q500GJCD high-strength building structural steel plate and its manufacturing method Download PDFInfo
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- CN107385324B CN107385324B CN201710426172.9A CN201710426172A CN107385324B CN 107385324 B CN107385324 B CN 107385324B CN 201710426172 A CN201710426172 A CN 201710426172A CN 107385324 B CN107385324 B CN 107385324B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
-
- 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
-
- 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
- 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
-
- 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
- C21D2211/001—Austenite
-
- 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
Abstract
The present invention relates to a kind of big thickness Q500GJCD high-strength building structural steel plates, the chemical component of the steel plate is by mass percentage, C:0.12-0.17%, Si:0.20 ~ 0.50%, Mn:1.10-1.60%, P :≤0.015%, S :≤0.005%, Cr:0.10-0.30%, Mo :≤0.30%, Ni:0.10-0.30%, Cu :≤0.30%, Al:0.02-0.04%, Nb:0.020-0.060%, Ti:0.01-0.02%, V+Nb+Ti≤0.20%, N :≤0.006% and inevitable impurity element, carbon equivalent is≤0.46%.Process flow: molten iron pretreatment, converter smelting, the refining of LF furnace, the refining of RH furnace, casting blank of continuous casting machine, blank heating, milling train controlled rolling, Acc cooling and finishing.The performance of the application building structure steel product is uniform, and comprehensive performance is good；It is with short production cycle, production cost is low.
Description
Technical field
The present invention relates to special steel metallurgical technology field, especially a kind of big thickness Q500GJC/D high-strength building structure
Steel plate and its manufacturing method.
Background technique
The large sizes such as skyscraper, super high-rise building, large span stadiums, airport, conference and exhibition center and steel-structure factory building
The structural steel GJ of architectural engineering has strict requirements, is to be different from existing for the special steel grade of other purposes steel grades, building
Industry is also especially specific and clearly demarcated to the classification of building structural steel, and the different trades mark has different purposes.
" steel plate for building structure " (the GB/T 19879-2015) that in November, 2016 implements, than GB/T 19879-2005 editions
The multiple high-intensitive trade mark such as Q500GJ, Q550GJ etc. are newly increased.This illustrates the steel plate for tall building application of China in recent years
It is more and more, in following not far skyscraper, super high-rise building, large span stadiums, airport, conference and exhibition center and steel knot
In terms of the large-scale construction engineerings such as structure workshop, only high-intensitive such as 420MPa, 460MPa grades of steel plate for building has been unable to meet and builds
Build industry development requirement.The appearance of the standard will be helpful to the building structure for promoting Corporation R & D to be higher than Q460GJ or more the trade mark and use
Steel plate.
In the prior art, the Q500 steel plate of correlation intensity can only just have in mechanical equipment steel at present, but mechanical equipment
The requirement of building trade is far not achieved again with steel,Such as yield tensile ratio, ballistic work, shock resistanceAll it cannot be guaranteed.
A kind of invention " quenched high intensity Q500D super-thick steel plate production method " of notification number CN103556075B is to use
300mm continuous casting billet produces 100-120mm special heavy plate, with slab rolling+Tempering and Quenching.It is large-scale that steel plate is applied to mine, harbour
The production of equipment, high production cost, the production cycle is long, and the condition of delivery is QT, limits the use of client.Notification number
A kind of invention " production method of quenched high intensity Q500E super-thick steel plate " of CN103556074B is using slab rolling+tune
The production technology of matter heat treatment, produces Q500E super-thick steel plate, belongs to mine, harbour large scale equipment steel, and high production cost is raw
It is long to produce the period, and the condition of delivery is QT, limits the use of client.
For the standard of GB/T 19879-2015 for building structural steel requirement, exploitation high intensity, low yield strength ratio, low temperature are tough
Property excellent Q500GJ series in new product, simplify production technology, shorten the production cycle, reducing production cost is this field skill
The Research Emphasis of art personnel.
Summary of the invention
The present invention uses 150mm-370mm continuous casting billet production 12-40mm thickness, the condition of delivery for TMCP(controlled rolling and controlled cooling)
Structural steel Q500GJC, Q500GJD for building, the thickness of steel plate meet GB/T 19879-2015 separate provision: minimum, maximum
Thickness specification, comprehensive performance is on the basis for the requirement for fully meeting GB/T 19879-2015 and steel plate for tall building
On, yield strength, the fluctuation range of tensile strength of product are small, and yield tensile ratio reaches≤0.83, more preferably 0.75~0.8,
The performance of its product is uniform, stablizes；It is with short production cycle, production cost is low.
The present invention solves the above problems used technical solution are as follows: a kind of big thickness Q500GJCD high-strength building structure
Chemical component with steel plate, the steel plate is C:0.12-0.17% by mass percentage, Si:0.20 ~ 0.50%, Mn:1.10-
1.60%, P :≤0.015%, S :≤0.005%, Cr:0.10-0.30%, Mo :≤0.30%, Ni:0.10-0.30%, Cu :≤
0.30%, Al:0.02-0.04%, Nb:0.020-0.060%, Ti:0.01-0.02%, V+ Nb+Ti≤0.20%, N :≤0.006%
And inevitable impurity element, carbon equivalent 0.36-0.46%.
Above-mentioned steel plate with a thickness of 12-40mm(12 mm, 40 mm be GB/T 19879-2015 respectively provide minimum,
Maximum gauge specification), the condition of delivery is Q500GJC, Q500GJD steel plate for building structure of TMCP, yield strength 530-
570MPa, 660~710MPa of tensile strength, elongation >=18%；Yield tensile ratio≤0.83(and standard is≤0.85), -20 DEG C of V-types
Ballistic work >=70J(standard is >=47J).Its comprehensive performance is able to satisfy the customer requirement of steel plate for tall building completely.
The main function for the smelting ingredient each element that the present invention designs:
C:C element forms the solute element of interstitial solid solution in Fe, and solid solution strengthening effect is greater than other elements in Fe
The middle solute element for forming displaced type solid solution.C in the tissue of steel in the form of cementite or pearlite in the presence of can generate very
Big phase transformation strengthening, improves intensity；But reduce toughness；Therefore it is 0.12-0.17% that the present invention, which controls C content,.
Mn:Mn element forms the solute element of displaced type solid solution in Fe；Mn mainly pass through " Mn of solid solution have compared with
Strong solid solution strengthening effect, the austenite region for expanding iron, the increase of Mn content have a significant impact the toughness of steel " etc. a variety of machines
System.Therefore, mentality of designing of the invention is centered around always on refinement crystal grain, and Mn content is controlled as 1.10-1.60%.
S: in micro- low-alloy steel, the content of S, which improves, declines the plasticity of steel, toughness；It is therefore preferable that S content 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:Nb can prevent crystal grain from growing up when low-alloy steel heats；During the rolling process by strain inducing, Nb is precipitated
Carbide precipitation on crystal boundary and dislocation, prevent ausforming recrystallize, reach refinement crystal grain；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 addition of Nb-V, intensity than individually plus Nb it is high.Austria can also be made
Family name's body crystal 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 significant reinforced ferrite of energy, Gu
Molten strengthening effect is higher than Mn.But when Si higher, intensity increases, but toughness declines.Therefore it controls within the scope of its proper content.
Cr: it is medium carbide former.The Cr in ferrite is dissolved in, solution strengthening is generated, there is stronger quench
Permeability improves the intensity of steel.But the welding performance that can excessively reduce the toughness of material while also reduce material is added.Therefore,
Content control is 0.10-0.30%
Ni:Ni is non-carbide forming element.It reduces the C content of eutectoid point, increases the volume fraction of pearlite, has
Conducive to raising intensity；The brittle transition temperature for advantageously reducing material simultaneously, improves the impact property of material.But Ni is unfavorable for giving birth to
Produce cost;Therefore, Ni content control of the present invention is 0.10-0.30%.
Carbon in the tissue of steel in the form of cementite or pearlite in the presence of can generate very big phase transformation strengthening, improve strong
Degree, it is especially more significant to tensile strength contribution, be conducive to the yield tensile ratio of product of the present invention；But it is unfavorable to the toughness of product.Cause
This, when Design of Chemical Composition, should consider that product carbon equivalent is restricted, the comprehensive performance requirement cared for again and products thereof；So
Carbon element content should not be added excessively high.The higher part in the part or yield tensile ratio that intensity lacks, can pass through and suitable micro- conjunction is added
Gold element such as niobium, vanadium, aluminium, nickel etc., and the suitable rolling mill practice of selection；Chemical component and control technique are combined and can be played
Precipitation strength, solution strengthening, refinement crystal grain, the inherent tissue for improving steel, reduce the brittle transition temperature of material；Power can be improved again
Learn performance.Reach the target for being conducive to that yield tensile ratio is low, impact flexibility is good.
The manufacturing method of big thickness Q500GJC, Q500GJD the high-strength building structural steel plate of the application, process flow: iron
Water pretreatment, converter smelting, the refining of LF furnace, the refining of RH furnace, casting blank of continuous casting machine, blank heating, milling train controlled rolling, Acc are cooling
And finishing.
(1) 150mm~370mm blank, continuous casting process major parameter: the degree of superheat 10 are produced using wide thickness plate continuous casting machine
~45 DEG C, 0.5~1.3m/min of casting machine pulling rate；Using dynamic secondary cooling technique, water proportion is 0.5~1.0L/kg；Solidification end is adopted
With dynamic soft-reduction, electromagnetic agitation；Charge length is regular by the assembly of change release plate size, by blank scale；Under blank
The slow cooling of line heap 24 hours or more；The blank of finishing qualification is sent into mill by production plan.
(2) blank heating: the preheating section temperature of heating furnace: 600-900 DEG C, heating one section of temperature: 1000-1180 DEG C, plus
Hot two sections of temperature: 1200-1240 DEG C, soaking section temperature: 1160-1220 DEG C；Heating total time >=10 × H minutes, H are that blank is thick
Degree, unit: cm；For the homogeneous heating for ensuring blank, blank each section should at the uniform velocity stepping in furnace.
(3) after blank is come out of the stove, removing iron scale is removed using thick descaling mill and pickle line processor；Thick de-scaling includes the water of smart de-scaling
Pressure >=20MPa.
(4) rolling divides the two-stage: roughing and finish rolling,
The controlled rolling of roughing: roughing includes the controlled rolling of austenite recrystallization area and austenite Unhydrated cement controlled rolling again, slightly
Roll start rolling temperature >=980 DEG C, in the controlled rolling of austenite recrystallization area, austenite recrystallization area makes with the increasing of pass deformation
Crystal grain refinement after austenite recrystallization；To avoid especially big crystal grain from occurring, then it should ensure that reduction in pass reaches one in high-temperature region
Quantitative, at least 2 passages are in the case where mill capacity allows, using heavy reduction, drafts >=38mm or reduction ratio >=15%；It is difficult to understand
In family name's body Unhydrated cement controlled rolling: using drafts is beaten, steel plate is rolled to temperature thickness, to temperature thickness by total reduction >=40%
>=50mm, plastic deformation elongate austenite grain, and the carbon nitrogen of the microalloy elements such as Zona transformans and Nb, V, Ti is formed in crystal grain
Ferrite preferential nucleation sites when the strain rust hair precipitating of compound, deformed austenite crystal boundary are austenites to ferritic transformation；From
And the ferrite of crystal grain refinement is obtained, intensity improves, and brittle transition temperature declines (i.e. toughness raising).
The controlled rolling of finish rolling: entering austenite after band temperature and ferrite two-phase region rolls, and 820-900 DEG C of start rolling temperature,
The pressure of certain passage is carried out in this two-phase region, deformation makes austenite grain continue to elongate in this temperature range, in its crystalline substance
Intragranular portion, which is formed, deforms new glide band；And new ferrite nucleus is formed at these positions, and ferrite is first precipitated.Through deforming
Afterwards, make to form a large amount of dislocations inside ferrite crystal grain, and form substructure (ferrite subgrain) in high temperature by these dislocations.Asia knot
Structure improves intensity, and brittle transition temperature reduces.For the comprehensive performance for ensuring finished steel plate, its crystal grain should be refined；For this purpose, last
Three accumulative reduction ratio >=28%, finishing temperature >=780 DEG C, preferably 780-830 DEG C.
(5) to ensure that the deformed austenite crystal grain after controlled rolling and the ferrite crystal grain after phase transformation are grown up, reach raising
Intensity, the purpose for not damaging toughness send water in Acc cooling equipment cooling, 5~18 DEG C/s of cooling rate after the completion of rolling；It is cold eventually
580-730 DEG C of temperature, the grain size of metallographic structure at this time is up to 8.0 grades (containing) or more；Then direct sending heat rectification machine leveling, rolled piece heat are rectified
Temperature >=500 DEG C；Cold bed natural cooling is sent later；It is cooled to 300-400 DEG C of then offline heap slow cooling, heap slow cooling >=300 DEG C, time
>=24 hours.
(6) flaw detection, apparent mass are examined, physicochemical property is examined, are sheared or cut, storage.
Usual blank heating temperature is higher than 1200 DEG C, reaches rolling of coming out of the stove when technique requires in the soaking time of furnace.In height
Warm area is rolled down to finished product thickness incessantly, therefore finishing temperature is higher, mostly in 950 DEG C or more (especially finished product thickness specifications
In the steel plate of 20mm or more).Air-cooled, ferrite and pearlite organizational coarseness is used after rolling, performance is relatively low, toughness is poor.
For the steel plate comprehensive performance for obtaining high-intensitive, high tenacity, the application is using controlled rolling and controls cold (TMCP) technique.Controlled rolling
Technique is divided into again: the controlled rolling of austenite recrystallization area, the controlled rolling of austenite Unhydrated cement, ferrite and pearlite (A+F) two-phase region
Double raisings of intensity and toughness are realized in controlled rolling.In particular, uniformly tiny ferrite crystalline substance is likely to be obtained in Unhydrated cement rolling
Grain, it is also possible to obtain the mixed crystal ferrite crystal grain of thickness unevenness.To avoid such unfavorable factor, in the timing of total deformation one,
Under mill capacity permissive condition, percentage pass reduction is bigger, and Zona transformans is more easy to produce, and is easier in global tissue
It is even.Therefore, it is the iron element alms bowl crystal grain for guaranteeing acquisition fine uniform, needs to use in Unhydrated cement and beat drafts, total reduction
>=40% is more satisfactory.
The GB/T 19879-2015 " steel plate for building structure " that in November, 2016 implements is newer than GB/T 19879-2005 editions
The multiple high-intensitive trade mark such as Q500GJ, Q550GJ etc. are increased, there are no Q500GJC, Q500GJD occur to build on Vehicles Collected from Market
It builds and uses steel sheet product.
The present invention is able to satisfy skyscraper, super high-rise building, large span stadiums, airport, conference and exhibition center and steel knot
The high-strength building steel plate of MPa grades of the large-scale construction engineerings such as structure workshop demand 460 or more；And production cost is low, the manufacturing cycle
It is short.
The present invention uses 150mm- 370mm thickness continuous casting material, and the production thickness 12-40 mm condition of delivery is TMCP's
The performance of Q500GJC, Q500GJD steel plate, product is uniform, and comprehensive performance is good；It is with short production cycle, production cost is low.
Detailed description of the invention
Fig. 1 is the steel plate metallographic structure figure of the embodiment of the present invention 1.
Specific embodiment
Present invention is further described in detail with reference to embodiments.
Using Jing Guo desulfurization molten iron and high-quality steel scrap as raw material, converter bottom (top) blows smelting, whole Argon, and LF furnace is de-
Oxygen, desulfurization, refining and the RH furnace degassing process for removing folder matter, adjusting component and temperature；Finally obtain the weight percent of molten steel
To be basic element with Fe and including following elemental composition: C:0.12-0.17%, Si:0.20 ~ 0.50%, Mn:1.10-1.60%,
P :≤0.015%, S :≤0.005%, Cr:0.10-0.30%, Mo :≤0.30%, Ni:0.10-0.30%, Cu :≤0.30%, Al:
0.02 ~ 0.04%, Nb:0.020-0.060%, Ti:0.01-0.02%, V+ Nb+Ti≤0.20%, N: it≤0.006% and can not keep away
The impurity element exempted from；Q500GJC, Q500GJD of carbon equivalent≤0.46%.
It is raw through wide thickness plate continuous casting machine constant temperature, constant speed and reasonable two cold technique, solidification end dynamic soft-reduction, electromagnetic agitation
The continuous casting material of output 150mm-370mm.By the assembly rule of change release plate size, by blank scale；The offline heap of blank
Slow cooling 24 hours or more.The blank of finishing qualification is sent into Rolling production by production plan.Heating process: the preheating section of heating furnace
Temperature: one section of 600-900 DEG C, heating temperature: two sections of 1000-1180 DEG C, heating temperature: 1200-1240 DEG C, soaking section temperature:
1160-1220℃；Heat total time >=10 × H minutes (H is sotck thinkness, unit: cm).For the homogeneous heating for ensuring blank,
Blank each section should at the uniform velocity stepping in furnace.Blank uses thick descaling mill and pickle line processor except removing iron scale after coming out of the stove；Thick de-scaling,
Smart de-scaling hydraulic pressure >=20MPa.
High-intensitive, high tenacity steel plate comprehensive performance is obtained, using controlled rolling and cold (TMCP) technique should be controlled
Rolling divides the two-stage: roughing controlled rolling and finishing rolling control rolling.
The controlled rolling of roughing: start rolling temperature >=980 DEG C, including the controlled rolling of austenite recrystallization area and austenite non-recrystallization
Area's controlled rolling, at least 2 passages are in the case where mill capacity allows in austenite recrystallization area controlled rolling passage, using heavy reduction, pressure
Amount >=38mm or reduction ratio >=15%；The total reduction of austenite Unhydrated cement controlled rolling is controlled >=40%, is rolled to gentle and kind
Degree is not less than 50mm to temperature thickness.The controlled rolling of finish rolling: i.e. ferrite and pearlite (A+F) two-phase region controlled rolling, to Wen Houkai
820-900 DEG C of temperature is rolled, finishing temperature is 780-830 DEG C；Three accumulative reduction ratio >=28% after finish rolling.
Send boiled water in Acc cooling equipment cooling after the completion of rolling, 5~18 DEG C/s of cooling rate；Final cooling temperature 580-730
℃；Then direct sending heat rectification machine leveling, rolled piece heat rectify temperature >=500 DEG C；Cold bed natural cooling is sent later；It is cooled to 300-400 DEG C
Then offline heap slow cooling, heap slow cooling >=300 DEG C, time >=24 hour.Flaw detection, apparent mass are examined again, physicochemical property is examined
It tests, shear or cuts, be put in storage.
Example 1: the present invention designs Q500GJC, Q500GJD thickness 370mm continuous casting material that smelting chemical ingredient provides, production
Roll 40mm thickness steel plate example.With 370 × 2300 × 3200mm of continuous casting billet, mill product 40 × 2500 × L(of plate length) mm.
Blank cold charge enters heating furnace, the preheating section temperature of heating furnace: one section of 750-900 DEG C, heating temperature: 1000-1150 DEG C, heating two
Duan Wendu: 1210-1230 DEG C, soaking section temperature: 1200-1220 DEG C；Heat 375 minutes total times.It is rolled through roughing, to gentle and kind
Spend 88mm；820 DEG C of finishing mill start rolling temperature, roll through finishing mill after temperature, and 815 DEG C of finishing temperature；Rolled piece is straight after the completion of rolling
Being sent into watering in Acc equipment is to accelerate cooling, 12-13 DEG C of cooling rate/s, 590 DEG C of final cooling temperature；Again through heat rectification machine leveling；It
After send cold bed natural cooling, be cooled to offline heap slow cooling at 330 DEG C；Through the sampling of 27 hours heap slow cooling rear hanging plates, physical and chemical inspection and
Quality inspection.Physicochemical property inspection result is shown in Table 1, metallographic structure (ferrite+pearlite, 8.0 grades of grain size or more) such as Fig. 1.
Example 2: the present invention designs Q500GJC, Q500GJD thickness 150mm continuous casting material that smelting chemical ingredient provides, production
Roll 12mm thickness steel plate example.With 150 × 2500 × 3300mm of continuous casting billet, mill product 12 × 2800 × L(of plate length) mm.
Blank cold charge enters heating furnace, and heating process is the same as example 1.It is rolled through roughing, to temperature thickness 50mm, the finishing mill start rolling temperature after temperature
900 DEG C, then rolled through finish rolling, finishing temperature >=796 DEG C；After the completion of rolling rolled piece direct sending enter Acc equipment in watering accelerate it is cold
But, 6-7 DEG C of cooling rate/s, 690-710 DEG C of final cooling temperature；Again through heat rectification machine leveling；Cold bed natural cooling is sent later, is cooled to
Offline heap slow cooling at 320 DEG C；Sampling, physical and chemical inspection and quality inspection after heap slow cooling in 24 hours.Physicochemical property inspection result is shown in
Table 1.
Service check result table
Table 1
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments
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 big thickness Q500GJCD high-strength building structural steel plate, it is characterised in that: the chemical component of the steel plate presses matter
Measuring percentages is C:0.12-0.17%, Si:0.20~0.50%, Mn:1.10-1.60%, P :≤0.015%, S :≤
0.005%, Cr:0.10-0.30%, Mo :≤0.30%, Ni:0.10-0.30%, Cu :≤0.30%, Al:0.02-0.04%,
Nb:0.020-0.060%, Ti:0.01-0.02%, V+Nb+Ti≤0.20%, N :≤0.006% and inevitable impurity member
Element, carbon equivalent 0.36-0.46%；
The technological process of production of the steel plate: molten iron pretreatment, converter smelting, the refining of LF furnace, the refining of RH furnace, casting blank of continuous casting machine, base
Expect heating, milling train controlled rolling, Acc cooling and finishing,
(1) produce 150mm~370mm blank using wide thickness plate continuous casting machine, continuous casting process major parameter: the degree of superheat is 10~45
DEG C, 0.5~1.3m/min of casting machine pulling rate；Using dynamic secondary cooling technique, water proportion is 0.5~1.0L/kg；End is solidified using dynamic
State slighter compress, electromagnetic agitation；Charge length is regular by the assembly of change release plate size, by blank scale；The offline heap of blank
Slow cooling 24 hours or more；The blank of finishing qualification is sent into mill by production plan；
(2) blank heating: the preheating section temperature of heating furnace: one section of 600-900 DEG C, heating temperature: 1000-1180 DEG C, heating two
Duan Wendu: 1200-1240 DEG C, soaking section temperature: 1160-1220 DEG C；Heating total time >=10 × H minutes, H is sotck thinkness,
Unit: cm；For the homogeneous heating for ensuring blank, blank each section should at the uniform velocity stepping in furnace；
(3) after blank is come out of the stove, removing iron scale is removed using thick descaling mill and pickle line processor；Thick de-scaling include smart de-scaling hydraulic pressure >=
20MPa；
(4) rolling divides the two-stage: roughing and finish rolling,
The controlled rolling of roughing: roughing includes the controlled rolling of austenite recrystallization area and austenite Unhydrated cement controlled rolling again, and roughing is opened
Temperature >=980 DEG C are rolled, at least 2 passages are in the case where mill capacity allows in the controlled rolling of austenite recrystallization area, using heavy reduction,
Drafts >=38mm or reduction ratio >=15%, austenite Unhydrated cement controlled rolling: using and beat drafts, total reduction >=40%,
Plastic deformation elongates austenite grain, and the carbonitride of the microalloy elements such as Zona transformans and Nb, V, Ti is formed in crystal grain
Strain rust hair precipitating, steel plate is rolled to temperature thickness, to temperature thickness >=50mm；
The controlled rolling of finish rolling: entering austenite after band temperature and ferrite two-phase region rolls, and 820-900 DEG C of start rolling temperature, finally
Three accumulative reduction ratio >=28%, finishing temperature >=780 DEG C；
(5) it is that the deformed austenite crystal grain after ensuring controlled rolling and the ferrite crystal grain after phase transformation are grown up, reaches raising intensity,
Do not damage toughness rolling send water in Acc cooling equipment cooling after the completion, 5~18 DEG C/s of cooling rate；Final cooling temperature 580-730
DEG C, the grain size of metallographic structure at this time is up to 8.0 grades (containing) or more；Then direct sending heat rectification machine leveling, rolled piece heat rectify temperature >=500
℃；Cold bed natural cooling is sent later；It is cooled to 300-400 DEG C of then offline heap slow cooling, heap slow cooling >=300 DEG C, time >=24 hour；
(6) flaw detection, apparent mass are examined, physicochemical property is examined, are sheared or cut, storage.
2. big thickness Q500GJCD high-strength building structural steel plate according to claim 1, it is characterised in that: steel plate is thick
Spend 12-40mm, condition of delivery TMCP, yield strength 530-570MPa, 660~710MPa of tensile strength, elongation >=18%；
Yield tensile ratio≤0.83, -20 DEG C of V-type ballistic work >=70J.
3. big thickness Q500GJCD high-strength building structural steel plate according to claim 1, it is characterised in that: the essence
The finishing temperature rolled is 780-830 DEG C.
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