CN106756618A - 100mm thickness Q420GJCD controlled rolling state high-strength structure steel plates - Google Patents
100mm thickness Q420GJCD controlled rolling state high-strength structure steel plates Download PDFInfo
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- CN106756618A CN106756618A CN201611057158.8A CN201611057158A CN106756618A CN 106756618 A CN106756618 A CN 106756618A CN 201611057158 A CN201611057158 A CN 201611057158A CN 106756618 A CN106756618 A CN 106756618A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 51
- 239000010959 steel Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000009749 continuous casting Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 238000010583 slow cooling Methods 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 238000007689 inspection Methods 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 7
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 229910001562 pearlite Inorganic materials 0.000 claims description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 238000007872 degassing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000013019 agitation Methods 0.000 claims description 2
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 238000010008 shearing Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 description 9
- 239000000047 product Substances 0.000 description 7
- 239000006104 solid solution Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 235000021110 pickles Nutrition 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical group C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
-
- 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
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- 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 plate and preparation method thereof of 100mm thickness Q420GJCD controlled rollings state 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 balance of Fe of N≤0.006%, 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 of V-type ballistic work >=80J.The same plate performance of the present invention production mmQ420GJC/D products of thickness 100 is uniform, stable, and combination property is good.
Description
Technical field
The invention belongs to building structure special steel technical field, and in particular to 100mm thick Q420GJCD high-strength steel sheets and
Its preparation method.
Background technology
The steel plate requirement of skyscraper has superior shock resistance, environmental protection, efficiency of construction is high, space availability ratio is high etc.
Many-sided special the characteristics of, as the developing direction of building structure in the world.But steel building has spy to steel used
Different technical requirements：Not only there is the performances such as easy welding, antidetonation, low-temperature impact resistance；Also the yield strength upper limit, tension are strong
Degree is high（Compared with general carbon or low-alloy structural steel plate）, carbon equivalent, the index request such as yield tensile ratio.China has built large quantities of in recent years
Steel building, by the application of steel plate for tall building, greatly adapts to and supports building structure to stratification high 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 is often needed 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 inventions
Method " produces 100~120mm special heavy plates using 400mm spy's thickness continuous casting billets, using acceleration after being heat-treated with strand rolling+normalizing
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 plates for building and its production method " of publication number CN105603310A inventions.It is
80mm steel plates are produced with 300mm continuous casting billets, cooling i.e. controlled rolling and controlled cooling is accelerated after rolling+roll using strand；It is with 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
It is controlled rolling and controlled cooling（TMCP）.
The content of the invention
It is WCR that the present invention uses the special thickness continuous casting billet production 100mm thickness of 450mm, the condition of delivery（Controlled rolling）Q420GJC/D
Steel plate, its combination property is fully able to meet the customer requirement of GB/T 19879-2015 and steel plate for tall building.Use
" continuous casting material+controlled rolling " technology, the same plate performance of product is uniform, stable；With short production cycle, low production cost.
The present invention the used technical scheme that solves the above problems is：A kind of 100mm thickness Q420GJCD controlled rolling state high intensity
Structural steel plate, the chemical composition of the steel plate is by mass percentage, 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%, balance of Fe and inevitable impurity element, carbon equivalent（C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15）= 0.
44~0.50% Q420GJC/D trades mark；The condition of delivery is WCR controlled rolling states；Yield strength is 440~460MPa, and tensile strength is
570~610MPa, elongation >=21%；Yield tensile ratio≤0.83, -20 DEG C of V-type ballistic work >=80J.Steel plate combination property is entirely capable of full
Sufficient 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 of the smelting composition each element of present invention design:
C:C element is the solute element to form interstitial solid solution in Fe, and its solid solution strengthening effect is more than other elements in Fe
Form the solute element of displaced type solid solution.Solubility of the C in iron is very low, and is greatly reduced with the decline of temperature；
But because the ag(e)ing process that C atoms have good diffusivity, formation can make yield strength, tension strong in the solid solution of saturation
Degree is improved（Because C in the tissue of steel with cementite or pearlite form in the presence of can produce very big phase transformation strengthening）;
But greatly reduce toughness.The present invention be ultra thick gauge, it is necessary to while ensureing armor plate strength, again with certain welding
Performance and low-temperature impact toughness；Therefore the C content in steel is controlled to 0.14~0.17%.
Mn:Mn elements form the solute element of displaced type solid solution in Fe.Mn mainly by " Mn of solid solution have compared with
Strong solid solution strengthening effect, the austenite region for expanding iron, Mn contents increase the toughness of steel is had a significant impact " etc. various machines
System, effectively improves the intensity of steel.The raising of intensity imply that pearlite relative quantity increases, solution strengthening and a certain degree of thin
Change caused by crystal grain.Therefore, mentality of designing of the invention is centered around on crystal grain thinning all the time, and Mn is controlled into 1.40~1.60%.
S：In humble steel alloy, the content of S is improved will decline the plasticity of steel, toughness；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.Therefore, preferably S is 0.002-0.005%.
Nb:Crystal grain can be prevented to grow up when low-alloy steel is heated；By strain inducing in the operation of rolling, the Nb's of precipitation
Carbon/nitrides precipitate prevents ausforming recrystallization on crystal boundary and dislocation, reaches crystal grain thinning；There is precipitation enhancement；
The microscopic structure of steel can be improved, performance is improved.
V：In addition to possessing Nb characteristic of elements, Nb-V is combined when adding V, and its strength ratio individually adds the height of Nb.Can make simultaneously
Austenite crystal is further refined, and makes the ferrite crystal grain after cooling more tiny, is conducive to the improvement of toughness.
Ti:It is the solid N element of reinforcing.In humble steel alloy is combined, N preferentially will form TiN with Ti.TiN prevents heating
When AUSTENITE GRAIN COARSENING effect compare Nb（CN）Greatly；The TiN and VN separated out 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, energy significantly reinforced ferrite, it is consolidated
Molten reinforcing effect is higher than Mn.But during Si >=0.70%, then intensity increases, and toughness declines.Therefore control its content 0.30-0.50% scopes
It is interior.
Ni:Ni is non-carbide former.It reduces the C content of eutectoid point, increases the volume fraction of pearlite, has
Beneficial to 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 produced, the intensity of steel is improved.
The preparation method of the application 100mm thickness Q420GJCD controlled rolling state high-strength structure steel plates, technological process is use
By the molten iron and high-quality steel scrap of desulfurization as raw material, converter bottom（Top）Blow smelting, 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；The offline heap slow cooling of blank more than 48 hours；The qualified blank of finishing is sent into Rolling production by the production schedule；Heater
Skill：The preheating section temperature of heating furnace：600-900 DEG C, one section of temperature of heating：1000-1180 DEG C, two sections of temperature of heating：1200-
1250 DEG C, soaking zone temperature：1160-1230℃；Heating total time >=580 minute, to ensure the homogeneous heating of blank, blank exists
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；The rolling point two-stage：Roughing controlled rolling and finishing rolling control are rolled, the control of roughing
System rolling：980-1100 DEG C of start rolling temperature, through 7-11 passes, treats temperature thickness 180-200mm, 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：After 810 ± 20 DEG C of start rolling temperature after temperature,
Finishing temperature is 780-810 DEG C, through 5-7 passes, accumulative reduction ratio >=35% in three roads after finish rolling；Direct sending heat after the completion of rolling
The machine of rectifying aligning, strong temperature >=550 DEG C of rolled piece heat；Send cold bed natural cooling afterwards, be cooled to 300-400 DEG C then turn offline heap delay
It is cold, heap slow cooling >=300 DEG C, its time >=36 hour；Checked through flaw detection, apparent mass inspection, physicochemical property, sheared, entered
Storehouse.
The application is entirely capable of producing the thickness 100mm conditions of delivery for WCR（Controlled rolling）Q420GJC/D steel plates；Its surrender
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 combination property is entirely capable of meeting GB/T 19879-2015 and steel plate for tall building
Customer requirement.
The production present invention for the special steel uses continuous casting material+controlled rolling, without watering after rolling（ACC）Quick cooling
And 350 DEG C or so of technology is naturally cooled to using cold bed, the same plate performance of product is uniform, stabilization；It is with short production cycle, raw
Produce 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 engineering demand such as structure factory building；And production cost is reduced, shorten the manufacturing cycle.
Brief description of the drawings
Fig. 1 is the metallographic structure at the thickness of embodiment of the present invention light plate 1/2.
Specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
Smelting, whole Argon, LF stoves are blown as raw material, converter bottom and furnace roof using the molten iron by desulfurization and high-quality steel scrap
Refining and the RH stove degassing process of deoxidation, desulfurization, removal folder matter, adjusting component and temperature；Finally give the weight percent of molten steel
Than for the element based on Fe and comprising 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%,
Balance of 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
Mix and produce 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 qualified blank of finishing is sent into Rolling production by the production schedule.Heating technique：The preheating section temperature of heating furnace：
600-900 DEG C, one section of temperature of heating：1000-1180 DEG C, two sections of temperature of heating：1200-1250 DEG C, soaking zone temperature：1160-
1230℃；Heating total time >=580 minute.To ensure the homogeneous heating of blank, blank each section should at the uniform velocity stepping 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).The rolling point two-stage：Roughing controlled rolling and finishing rolling control are rolled.The controlled rolling of roughing：Start rolling temperature 980-1100
DEG C, through 7-11 passages, treat temperature thickness 180-200mm.At least ensure 2 passages before roughing in 5 passages in the case where mill capacity is allowed, press
Lower amount >=38mm or reduction ratio are in 10-18%.The controlled rolling of finish rolling：After 810 ± 20 DEG C of start rolling temperature after temperature, finishing temperature is
780-810 DEG C, open rolling and finishing temperature are close；Through 5-7 passes, accumulative reduction ratio >=35% in three roads after finish rolling.Roll
Into rear direct sending heat rectification machine aligning, strong temperature >=550 DEG C of rolled piece heat；Cold bed natural cooling is sent afterwards；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.Again flaw detection, apparent mass inspection, physics and chemistry
Can inspection, shearing（Cutting）, 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%, balance of Fe and not
Evitable impurity element, carbon equivalent is 0.48% Q420GJC/D thickness 450mm continuous casting materials, production rolling 100mm thickness steel
Plate example.With 450 × 2300 × 3200mm of continuous casting billet, 100 × 2500 × L of mill product plate（Length）mm.Blank cold charge enters to add
Hot stove, the preheating section temperature of heating furnace：850-900 DEG C, one section of temperature of heating：1000-1100 DEG C, two sections of temperature of heating：1210-
1230 DEG C, soaking zone temperature：1200-1210℃；590 minutes total times of heating.Rolled after de-scaling, roughing rolls 9 passages,
Temperature thickness 200mm is treated, is rolled and at least ensure 2 passages in the case where mill capacity is allowed in preceding 5 passage, drafts >=38mm treats Wen Houjing
805 DEG C of milling train start rolling temperature, finish rolling through 6 passes, 790 DEG C of finishing temperature, afterwards accumulative reduction ratio >=35% in three roads；Roll
Into rear rolled piece without（Water i.e. Acc）Accelerate cooling, and on cold bed natural cooling, be cooled to 350 DEG C of offline heap slow cooling；Through 42
Sampling, physical and chemical inspection and quality inspection after hour.Physicochemical property assay is shown in Table 1, metallographic structure（It is organized as：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
| Position | Specification, mm | Yield strength (ReL),MPa | Tensile strength, MPa | Elongation, % | Yield tensile ratio | - 20 DEG C, Akv/J | Z-direction, % |
| At 1/4 | 100 | 448 | 590 | 21 | 0.76 | 88 | 41 |
| At 1/2 | 100 | 440 | 581 | 20.5 | 0.76 | 76 | 40 |
| Standard | ＞ 50-100 | 410-540 | 530-680 | ≥20 | ≤0.83 | ≥47 | (GB/T 19879-2015) |
" continuous casting material+controlled rolling of 450mm thickness " technology of the invention.Using 450 mm thickness continuous casting billets, thickness is produced
The condition of delivery of 100 mm is WCR（Controlled rolling）Q420GJC/D steel plates for building, than using " steel ingot+normalizing is heat-treated " or use
The Q420GJC/D steel plates for building of " after the heat treatment of continuous casting material+normalizing with accelerate to cool down " production, it is with short production cycle, be produced into
This is low；Operation 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, stabilization, and combination property is entirely capable of full
The customer requirement of sufficient GB/T 19879-2015 and steel plate for tall building.
In addition to the implementation, present invention additionally comprises having other embodiment, all use equivalents or equivalence replacement
The technical scheme that mode is formed, all should fall within the scope of the hereto appended claims.
Claims (4)
1. a kind of 100mm thickness Q420GJCD controlled rolling state high-strength structure steel plates, it is characterised in that：The chemical composition of the steel plate is pressed
Mass percent is calculated as, 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%, balance of Fe and inevitable impurity
Element, carbon equivalent（C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15）=0. 44~0.50% Q420GJC/D trades mark；Delivery
State is WCR controlled rolling states；Yield strength is 440~460MPa, and tensile strength is 570~610MPa, elongation >=21%；Qu Qiang
Than≤0.83, -20 DEG C of V-type ballistic work >=80J.
2. 100mm thickness Q420GJCD controlled rolling state high-strength structure steel plates according to claim 1, it is characterised in that：Steel
Plate combination property is entirely capable of meeting GB/T 19879-2015.
3. 100mm thickness Q420GJCD controlled rolling state high-strength structure steel plates 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.
4. a kind of method for preparing 100mm thickness Q420GJCD controlled rolling state high-strength structure steel plates described in claim 1, its feature
It is：Technological process, using the molten iron by desulfurization and high-quality steel scrap as raw material, converter bottom（Top）Blow smelting, whole Argon,
Refining and the RH stove degassing process of the deoxidation of LF stoves, desulfurization, removal folder matter, adjusting component and temperature；Through wide thickness plate continuous casting machine constant temperature,
Constant speed and rational two cold technique, solidification end produce 450mm blanks using dynamic soft-reduction, electromagnetic agitation；By Steel Ruler
Very little assembly rule, by blank scale；The offline heap slow cooling of blank more than 48 hours；The qualified blank of finishing is sent out by the production schedule
Send Rolling production；Heating technique：The preheating section temperature of heating furnace：600-900 DEG C, one section of temperature of heating：1000-1180 DEG C, plus
Hot two sections of temperature：1200-1250 DEG C, soaking zone temperature：1160-1230℃；Heating total time >=580 minute, to ensure blank
Homogeneous heating, 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 and smart de-scaling
Machine removes scale on surface；Thick de-scaling and smart de-scaling hydraulic pressure >=20MPa；The rolling point two-stage：Roughing controlled rolling and finish rolling
Controlled rolling, the controlled rolling of roughing：980-1100 DEG C of start rolling temperature, through 7-11 passes, treats temperature thickness 180-200mm,
Before roughing in 5 passages at least 2 passages drafts >=38mm or reduction ratio 10-18%；The controlled rolling of finish rolling：Treat Wen Houkai
810 ± 20 DEG C of temperature is rolled, finishing temperature is 780-810 DEG C, through 5-7 passes, accumulative reduction ratio >=35% in three roads after finish rolling；
Direct sending heat rectification machine aligning after the completion of rolling, strong temperature >=550 DEG C of rolled piece heat；Cold bed natural cooling is sent afterwards, is cooled to 300-400
DEG C then turn offline heap slow cooling, heap slow cooling >=300 DEG C, its time >=36 hour；Through flaw detection, apparent mass inspection, physics and chemistry
Can inspection, shearing, storage.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107385329A (en) * | 2017-06-30 | 2017-11-24 | 江阴兴澄特种钢铁有限公司 | A kind of big thickness Q500GJE high-strength buildings structural steel plate and its manufacture method |
| CN107385324A (en) * | 2017-06-08 | 2017-11-24 | 江阴兴澄特种钢铁有限公司 | A kind of big thickness Q500GJCD high-strength buildings structural steel plate and its manufacture method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05171265A (en) * | 1991-12-20 | 1993-07-09 | Sumitomo Metal Ind Ltd | Production of steel material with high atmosphere corrosion resistance for steel frame structure excellent in high temperature strength characteristic |
| CN1088998A (en) * | 1992-12-31 | 1994-07-06 | 北京科技大学 | High toughness of high strength steel oil pipe |
| CN101323929A (en) * | 2007-06-14 | 2008-12-17 | 舞阳钢铁有限责任公司 | High strength steel plate for big thickness tall building structure and production method thereof |
| CN101440461A (en) * | 2007-11-21 | 2009-05-27 | 宝山钢铁股份有限公司 | Casinghead gas corrosion resistant pumping rod steel and manufacturing method thereof |
| CN101497969A (en) * | 2009-03-13 | 2009-08-05 | 武汉钢铁(集团)公司 | High-performance weather-resisting anti-seismic steel for building and production method thereof |
-
2016
- 2016-11-26 CN CN201611057158.8A patent/CN106756618B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05171265A (en) * | 1991-12-20 | 1993-07-09 | Sumitomo Metal Ind Ltd | Production of steel material with high atmosphere corrosion resistance for steel frame structure excellent in high temperature strength characteristic |
| CN1088998A (en) * | 1992-12-31 | 1994-07-06 | 北京科技大学 | High toughness of high strength steel oil pipe |
| CN101323929A (en) * | 2007-06-14 | 2008-12-17 | 舞阳钢铁有限责任公司 | High strength steel plate for big thickness tall building structure and production method thereof |
| CN101440461A (en) * | 2007-11-21 | 2009-05-27 | 宝山钢铁股份有限公司 | Casinghead gas corrosion resistant pumping rod steel and manufacturing method thereof |
| CN101497969A (en) * | 2009-03-13 | 2009-08-05 | 武汉钢铁(集团)公司 | High-performance weather-resisting anti-seismic steel for building and production method thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385324A (en) * | 2017-06-08 | 2017-11-24 | 江阴兴澄特种钢铁有限公司 | A kind of big thickness Q500GJCD high-strength buildings structural steel plate and its manufacture method |
| CN107385329A (en) * | 2017-06-30 | 2017-11-24 | 江阴兴澄特种钢铁有限公司 | A kind of big thickness Q500GJE high-strength buildings structural steel plate and its manufacture 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 |
| CN109158432A (en) * | 2018-09-05 | 2019-01-08 | 东北大学 | A kind of milling method promoting rear bloom consistency under convex roll-in |
| CN109457097A (en) * | 2018-12-11 | 2019-03-12 | 唐山中厚板材有限公司 | A kind of production method of think gauge high-strength steel plate |
| CN109852890A (en) * | 2019-04-09 | 2019-06-07 | 鞍钢股份有限公司 | Method for improving low-temperature toughness of oil pipeline L450M steel plate |
| CN110408860A (en) * | 2019-07-15 | 2019-11-05 | 江阴兴澄特种钢铁有限公司 | A kind of spy's thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate and its manufacturing method |
| CN112831724A (en) * | 2021-01-04 | 2021-05-25 | 南京钢铁股份有限公司 | A kind of S420 high-strength low-temperature structural steel and normalizing rolling preparation method thereof |
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