CN105603303B - A kind of high strength ultra-thick steel plates - Google Patents
A kind of high strength ultra-thick steel plates Download PDFInfo
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- CN105603303B CN105603303B CN201510996876.0A CN201510996876A CN105603303B CN 105603303 B CN105603303 B CN 105603303B CN 201510996876 A CN201510996876 A CN 201510996876A CN 105603303 B CN105603303 B CN 105603303B
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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
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/06—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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
-
- 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
Abstract
A kind of high strength ultra-thick steel plates, remember that it includes with mass percent：C：0.10 0.16%, Si：0.35% 0.45%, Mn：1.35% 1.55%, Ni：0.15 0.50%, Cr：0.001% 0.25%, P：≤ 0.008%, S：≤ 0.005%, Al：0.015% 0.04%, V：0.06% 0.08%, N：0.0090% 0.015%, and 0.5*0.529*Al+0.2*0.275*V≤N≤0.8* (0.529*Al+0.275*V), balance of Fe；The thickness of the steel plate is 200 400mm, and through normalized treatment, normalizing process is air cooling or water-cooled after 890~930 DEG C of heating sammings.1/4 position in steel plate section and center portion are tiny ferritic structure and a small amount of pearlitic structrure, and its grain size is more than 8 grades of ASTM.
Description
Technical field
It is particularly a kind of thick more particularly, to a kind of high strength ultra-thick steel plates the present invention relates to a kind of metallurgical technology field
Ultra-thick steel plates material of the degree more than 200mm.
Background technology
With the requirement developed rapidly with equipment enlarging of industrial technology, super thick of the countries in the world to various intensity ranks
The demand of steel plate is dramatically increased, the thickness also constantly lifting therewith of steel plate.For example, ocean engineering drilling jack-up unit stake
Leg rack-plate, its intensity rank reaches 690MPa, and thickness is from 127mm to 224mm.Oil refining device --- hydrogenation is anti-
Device resistant to hydrogen CrMo steel is answered, its thickness limit demand also lifts more than 200mm by past 120mm.The steel of part water-power steel
Plate thickness is even more and reaches more than 270mm.Ultra-thick steel plates do not require nothing more than certain obdurability matching, it is even more important that in order to protect
The safety and steady operation of card equipment and engineering, should have good section performance uniformity and good center portion performance, especially
Low-temperature flexibility.The active demand of the steel plate with good section performance uniformity and low-temperature flexibility of high intensity superthick, gives
Those skilled in the art brings increasing challenge.
The content of the invention
In view of the above problems, it is an object of the invention to provide a kind of ultra-thick steel plates material of 36kg intensity ranks, the material
With good sectional uniform and low-temperature flexibility, especially good center portion impact flexibility.
The high strength ultra-thick steel plates of present invention definition refer to steel plate of the intensity more than 36kg ranks, thickness more than 200mm.
The invention provides a kind of high strength ultra-thick steel plates, remember that it includes with mass percent：C：0.10-0.16%,
Si：0.35%-0.45%, Mn：1.35%-1.55%, Ni：0.15-0.50%, Cr：0.001%-0.25%, P：≤
0.008%, S：≤ 0.005%, Al：0.015%-0.04%, V：0.06%-0.08%, N：0.0090%-0.015%, and
0.5*0.529*Al+0.2*0.275*V≤N≤0.8* (0.529*Al+0.275*V), balance of Fe.
The thickness of the steel plate is 200-400mm, and through normalized treatment, normalizing process is air cooling after 890~930 DEG C of heating sammings
Or water-cooled.1/4 position in steel plate section and center portion are tiny ferritic structure and a small amount of pearlitic structrure, and its grain size is more than
8 grades of ASTM.
Further, the production technology of above-mentioned steel plate, comprises the following steps：
(1) smelt, the raw material that will be prepared using electric furnace or converter is smelted；
(2) refine, using ladle refining furnace, for molten steel desulfurizing, temperature adjustment and alloying, and for Dehydrogenation of Molten Steel and denitrogenation or
Person's vacuum outgas；
(3) pour into a mould, protect ingot casting to pour into a mould using argon gas；
(4) cogging, forging or rolling-cogging；
(5) roll, the steel plate after cogging is rolled into 200-400mm thickness in milling train；
(6) it is heat-treated, by the steel plate through rolling through normalized treatment, normalizing process is air cooling after 890-930 DEG C of heating samming
Or water-cooled；
Wherein, the minimum thickness of minimum ingot casting body is not less than 800mm, and total deformation ratio is not less than 3:1.
Further, the production technology of above-mentioned steel plate, comprises the following steps：
(1) smelt, the raw material that will be prepared using electric furnace or converter is smelted；
(2) refine, using ladle refining furnace, for molten steel desulfurizing, temperature adjustment and alloying, and for Dehydrogenation of Molten Steel and denitrogenation or
Person's vacuum outgas；
(3) strand, slab or billet continuous casting；
(4) electroslag remelting, using gas shield electroslag remelting；
(4) cogging, rolling-cogging；
(5) roll, the steel plate after cogging is rolled into 200-400mm thickness in milling train；
(6) it is heat-treated, by the steel plate through rolling through normalized treatment, normalizing process is air cooling after 890-930 DEG C of heating samming
Or water-cooled；
Wherein, the minimum thickness of minimum ingot casting body is not less than 500mm, and total deformation ratio is not less than 2:1.
Technical scheme is illustrated as follows：
Ultra-thick steel plates for thickness more than 200mm, production difficult point is the acquisition reinforcing effect for how ensureing whole cross section
Fruit and performance uniformity, should especially obtain the good low-temperature flexibility of center portion.For the steel plate of 36kg intensity ranks, its micro- group
It is woven to ferrite and pearlite tissue.The cooling rate of ultra-thick steel plates hot rolling and air cooling is very low, and the average cooling rate of such as 250mm steel plates is not
More than 0.05 DEG C/s, even if using cooling is accelerated after rolling, due to the hysteresis effect of heat transfer, the center portion cooling rate of steel plate is also no more than
0.1℃/s.The microscopic structure that this present situation causes rolled steel plate is very thick.Therefore generally make to surpass using normalizing heat treatment
The structure refinement and homogenization of steel plate.It is the raising for promoting cooling rate in temperature-fall period during normalizing, is also adopted by accelerating cooling sometimes
Mode, such as water-cooled.
The surface of ultra-thick steel plates, 1/4 and the cooling rate of center portion position differ greatly, and should be obtained by composition design wider cold
The mechanical property of the stabilization under fast scope, and refinement microstructure.V-N micro-alloying technologies can largely realize this technology
It is required that.Certain V element is added in steel, and increases the N content in steel.Because the increase of N content improves V (CN) particle
Chemical stability, in normalizing heating and insulating process, the back dissolving amount of V is reduced and keeps not molten V particles increase.This part grain
The undue of austenite crystal is grown up during sub- one side can prevent normalizing insulating process, keeps Austenite Grain Refinement effect；Separately
On the one hand, V (CN) is the effective particle for inducing Intragranular Acicular Ferrite forming core, can improve the heterogeneous nucleation rate of ferritic phase, improves iron
Ferritic phase transformation fraction, fining ferrite grains size.And enter the V element of matrix in steel plate normalizing heating process again back dissolving,
Separated out in ferrite again in normalizing cooling procedure, play the effect of precipitation strength.The grain refining effect of not molten V particles and
The precipitating reinforcing effect of solid solution V, the two is complementary to one another so that the different cross section position of ultra-thick steel plates obtains preferable obdurability
Match somebody with somebody.According to Orawan hardening rules, precipitation strength is to the contribution margin of intensity by formula Δ σp=8.995 × 103f1/2·d-1·ln
(2.417d) is determined.In formula, f is the volume fraction of the second phase, and d is Second Phase Particle size.The volume fraction of Second Phase Precipitation
More, Second Phase Particle size is smaller, and the contribution to intensity is bigger.Ultra-thick steel plates cooling rate surface higher and 1/4 position, just
V particles during fire separate out small and dispersed, can obtain precipitating reinforcing effect higher, while cooling rate is higher, ferritic structure
More refine.And in the center portion of ultra-thick steel plates, because cooling rate is relatively low, the precipitation size of V (CN) is larger, the contribution to intensity is omited
It is low.But because cooling rate is slower, the amount of precipitation (volume fraction) of V increases.Meanwhile, the reduction of cooling rate is conducive to the not molten V of austenite
(CN) particle promotes the effect of Intragranular Acicular Ferrite phase transformation, compensate for causing grain coarsening due to cooling rate reduction to a certain extent
It is not enough.Thus, using appropriate V microalloyings, and improve the N content in steel and improve the Section Effect of ultra-thick steel plates.It is overall
On, the crystal grain of ultra-thick steel plates is thicker, and fining austenite grains are separated out by AlN particles, and by phase transformation fining ferrite grains.
To sum up, the composition design of the ultra-thick steel plates of 36kg intensity ranks is on the basis of certain C-Si-Mn alloy systems, plus
Enter the V element of 0.06-0.08%, N content is improved to 0.0090-0.015% by traditional 0.003-0.005% levels, and add
Enter the Al elements of 0.015-0.040%, the phases of AlN second are combined to form with the N in steel, be pinned on austenite grain boundary, refinement is difficult to understand
Family name's body crystallite dimension.In view of the yield strength rank of 36kg, (when more than 150mm thickness, actual requirement is not less than
290MPa), in the scope of 0.10-0.16%, the target of Si contents is 0.40% (scope of 0.35-0.45%) for C content control,
Mn content ranges are 1.35-1.55%.Additionally, it is contemplated that the toughening effect of steel plate, adds the Ni of 0.15-0.50% contents in steel
Element, is refinement pearlitic structrure, can also add the Cr elements of 0.01-0.25%.According to the actual (real) thickness of steel plate, C, Mn, Ni,
The constituent contents such as Cr can carry out bound adjustment.
In view of Al, V to the competition binding relation of N element, the precipitation under typical composition is calculated using thermodynamic software
Phase result, as shown in Figure 1.Result shows, in order to reach the combination effect of bottom line, realizes preferable crystal grain refinement and precipitation
Reinforcing, respectively in terms of Al, V total amount, N content cannot be below 50%AlN+20%VN needed for total amount, i.e., should meet N >=0.5*
The relational expression of 0.529*Al+0.2*0.275*V.But, when N content is too high in steel, also it is easily caused free N or strain-aging performance
The results such as deterioration, should also meet the relational expression of N≤0.8* (0.529*Al+0.275*V).
In addition to ensureing the composition design aspect of good obdurability matching and Section Effect, ultra-thick steel plates should also use ultrapure
Net to smelt mode, S, P content should be as low as possible, need to use LF external refinings, and carry out vacuum outgas, molding casting.Meanwhile, should
Ensure blank by certain deformation ratio, the deformation ratio of conventional blank is not less than 3:1, the deformation ratio of electroslag remelting base is not less than 2:
1.The present invention relates to the ultra-thick steel plates product of more than 200mm, and traditional continuous casting steel billet is general all within 400mm, extremely individually
It is capable of achieving the continuous casting billet of 450mm thickness, but continuous casting segregation and loose more serious.Therefore, continuous casting billet be not suitable for carrying out 200mm with
The ultra-thick steel plates production of upper thickness.Preferably produced using large steel ingot molding or electroslag remelting mode.When molding production using large steel ingot,
Should be processed through LF refining+vacuum (VD or RH) after smelting, whole process Ar gas shieldeds are needed during cast, to prevent air-breathing from influenceing the smelting of steel ingot
Golden amount.To ensure the final product quality of ultra-thick steel plates, compression ratio should at least be not less than 3:1.Shown according to mass data research, it is right
In 200mm with the production of upper steel plate, microcephaly's thickness (most thin ingot body thickness) of steel ingot is not lower than 800mm, otherwise, the heart easily occurs
Portion's consistency is inadequate, loose cannot effectively press the situation for causing performance not good.When being produced using electroslag remelting process, should ensure that
The electrode steel raw material of electroslag remelting has good Composition Control, and Electrode for remelting steel should use LF refining+VD or RH vacuum outgas,
And molding casting.In electroslag remelting, whole should be carried out using Ar protections, to prevent the fluctuation of gas content to final products
Influence can be produced.Because well-known electroslag remelting solidification and crystallization mode and metallurgical quality are better than common founding iron mold, be up to
Minimum compression ratio to preferably final product quality is low than ingot casting, and typically no less than 2:1.And when producing minimum 200mm steel plates,
It should also ensure that electroslag remelting plate blank thickness is not less than 500mm, the result for the reduction of center portion mechanical property otherwise also easily occur.
The whole cross section of high strength ultra-thick steel plates of the invention is obtained in that good reinforcing effect and uniform performance, especially
It is to be obtained in that good center portion low-temperature flexibility, solves the ultra-thick steel plates intensity for perplexing those skilled in the art for a long time
Low, uneven microstructure, along the problem that thickness x cross sectional performance difference is excessive, center portion low-temperature flexibility is not good.
Brief description of the drawings
Fig. 1 is the precipitated phase variation with temperature situation of high strength ultra-thick steel plates of the present invention；
Fig. 2 is 1/4 position metallographic structure of the embodiment 1 of high strength ultra-thick steel plates of the present invention；
Fig. 3 is the center portion position metallographic structure of the embodiment 1 of high strength ultra-thick steel plates of the present invention；
Fig. 4 is the tough crisp conversion temperature of the embodiment 1 of high strength ultra-thick steel plates of the present invention；
Fig. 5 is the series of temperatures impact fracture sample of the embodiment 1 of high strength ultra-thick steel plates of the present invention；
Fig. 6 is the section hardness curve of the embodiment 1 of high strength ultra-thick steel plates of the present invention.
Specific embodiment
Technical scheme is described in detail below in conjunction with specific embodiment.
Embodiment 1：
A kind of high strength ultra-thick steel plates of the invention, thickness 251mm, with mass percent note, including：C：0.13%, Si：
0.38%, Mn：1.37%, Ni：0.34%, Cr：0.032%, P：0.0024%, S：0.0011%, V：0.064%, Al：
0.025%, N：0.013%, Ti：0.0032%, balance of Fe；The production technology of the steel plate is that electric furnace smelting → LF+VD is refined
→ Ar gas shieldeds mold flat ingot cast → rolling-cogging → rolling → heat treatment.Wherein, the thickness of ingot body is 850~900mm.
Technology for Heating Processing is：895 DEG C of insulation 18hr, air cooling of coming out of the stove.
From the tensile property result of table 1 of embodiment 1 can be seen that steel plate surface, 1/4 and center portion yield strength only phase
Within difference 12MPa, uniformity is very good.And the Z-direction performance (contraction percentage of area) of thickness direction reaches 63%, far above existing mark
Most stringent of Z35 requirements in standard (contraction percentage of area is not less than 35%).The low temperature impact properties of table 2 show, the surface of steel plate, 1/
4 and -40 DEG C of center portion position low-temperature impact toughness in more than 250J, and without obvious vertically and horizontally difference, center portion performance does not have yet
Occur substantially reduction.Fig. 2 and Fig. 3 are the microscopic structure of the position of this ultra-thick steel plates 1/4 and center portion position, it can be seen that be tiny
Ferrite+pearlitic structrure, measured through using division lines method, the ferrite grain size of 1/4 position is 17.5 μm, center portion position
Ferrite grain size be 19.1 μm, be superior to the level of 8 grades of ASTM grain sizes.The series of temperatures impact curve of Fig. 4 and Fig. 5
Then shown with fracture apperance, not only surface, 1/4 and -40 DEG C of ballistic works of center portion position reach more than 250J, -60 DEG C of ballistic works
Also in more than 150J, or even -80 DEG C of ballistic works also reach more than 100J.The section hardness curve of Fig. 6 then shows, on surface to the heart
In the range of portion, nonhomogeneous hardness is within 10HB, it is shown that good sectional uniform.
Embodiment 2：
A kind of high strength ultra-thick steel plates material, thickness 249mm, with mass percent note, including：C：0.132%, Si：
0.41%, Mn：1.41%, Ni：0.28%, Cr：0.042%, P：0.0032%, S：0.0012%, V：0.072%, Al：
0.019%, N：0.0118%, Ti：0.0037%, balance of Fe；The production technology of the steel plate is that electric furnace smelting → LF+VD is smart
The anistree ingot cast → hammer cogging → rolling → heat treatment of refining → Ar gas shieldeds molding.Wherein, anistree ingot a diameter of 1550~
1800mm, forging ratio is more than 4.Normalizing heat treatment technique is：915 DEG C of insulation 18hr, air cooling of coming out of the stove.
From the tensile property result of table 3 of embodiment 2 can be seen that the 1/4 of steel plate and the yield strength of center portion differ only by
Within 10MPa, uniformity is very good.It is most stringent of far above in current standard and the Z-direction performance of thickness direction reaches 61%
Z35 requirements.The low temperature impact properties of table 4 show that 1/4 and -40 DEG C of center portion position low-temperature impact toughness of steel plate are above 100J
More than, and without obvious vertically and horizontally difference, there is not substantially reduction yet in center portion performance.
The room temperature tensile properties of the embodiment 1 of table 1
- 40 DEG C of impact properties of the embodiment 1 of table 2
The room temperature tensile properties of the embodiment 2 of table 3
- 40 DEG C of impact properties of the embodiment 2 of table 4
Embodiment 3：
A kind of high strength ultra-thick steel plates material, thickness 202mm, with mass percent note, including：C：0.11%, Si：
0.36%, Mn：1.48%, Ni：0.22%, Cr：0.052%, P：0.0052%, S：0.0022%, V：0.062%, Al：
0.024%, N：0.0107%, Ti：0.0031%, balance of Fe；The production technology of the steel plate is that converter smelting → LF+VD is smart
Refining → 250mm thickness continuous casting steel billets cast → electroslag remelting → rolling-cogging → rolling → heat treatment.Wherein, electroslag remelting is obtained thick
Slab is 800mm, and two fire are become a useful person, and is rolled into 202mm steel plates, and carry out normalized treatment.Technology for Heating Processing is：900 DEG C of insulations
15hr, to come out of the stove accelerate into water is cooled to less than 200 DEG C.
Embodiment 3 has refined the crystallite dimension of ferritic structure, 1/4 position and 1/2 position using cooling is accelerated after normalizing
Respectively 12.5 μm and 16.7 μm (corresponding A STM9.5 grades and 8.5 grades).Due to accelerate cool down, yield strength reach 380MPa with
On.Using electroslag remelting process metallurgical quality preferably, especially the Z-direction performance (reduction of area) of center portion reaches more than 70%.-40℃
Ballistic work reaches more than 300J, it is shown that (good section is equal for good low-temperature flexibility level and less section performance difference
Even property), as shown in table 5.
Embodiment 4：
A kind of high strength ultra-thick steel plates material, thickness 300mm, with mass percent note, including：C：0.15%, Si：
0.43%, Mn：1.49%, Ni：0.46%, Cr：0.082%, P：0.0045%, S：0.0021%, V：0.078%, Al：
0.023%, N：0.0127%, Ti：0.0057%, balance of Fe；The production technology of the steel plate is that electric furnace smelting → LF+VD is smart
The anistree ingot cast → hammer cogging → rolling → heat treatment of refining → Ar gas shieldeds molding.Wherein, anistree ingot a diameter of 1550~
1800mm, forging ratio is more than 4.Technology for Heating Processing is：900 DEG C of insulation 24hr, air cooling of coming out of the stove.
Embodiment 5：
A kind of high strength ultra-thick steel plates material, thickness 380mm, with mass percent note, including：C：0.148%, Si：
0.42%, Mn：1.46%, Ni：0.37%, Cr：0.012%, P：0.0028%, S：0.0011%, V：0.076%, Al：
0.031%, N：0.0147%, Ti：0.0035%, balance of Fe；The production technology of the steel plate is that electric furnace smelting → LF+VD is smart
The anistree ingot cast → hammer cogging → rolling → heat treatment of refining → Ar gas shieldeds molding.Wherein, anistree ingot a diameter of 1550~
1800mm, forging ratio is more than 4.Technology for Heating Processing is：930 DEG C of insulation 24hr, air cooling of coming out of the stove.
The result of embodiment 4 and embodiment 5 also shows, using composition of the invention and technological design, can obtain
The yield strength of more than 300MPa and good low-temperature impact toughness (- 40 DEG C reach more than 200J), ferrite grain size is more than 8
Level.
The mechanical property of the embodiment 3,4,5 of table 5
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.
Claims (2)
1. a kind of high strength ultra-thick steel plates, by percentage to the quality, it includes：C：0.10-0.16%, Si：0.35%-
0.45%, Mn：1.35%-1.55%, Ni：0.15-0.50%, Cr：0.001%-0.25%, P：≤ 0.008%, S：≤
0.005%, Al：0.015%-0.04%, V：0.06%-0.08%, N：0.0090%-0.015%, balance of Fe；Its feature
It is,
0.5×0.529×Al+0.2×0.275×V≤N≤0.8×(0.529×Al+0.275×V)；
The thickness of the steel plate is 200-400mm, through normalized treatment, normalizing process be after 890-930 DEG C of heating samming air cooling or
Water-cooled, 1/4 position in the steel plate thickness section and center portion are tiny ferritic structure and a small amount of pearlitic structrure, its crystal grain
Degree is more than 8 grades of ASTM.
2. a kind of production technology of the high strength ultra-thick steel plates described in claim 1, comprises the following steps：
(1) smelt, the raw material that will be prepared using electric furnace or converter is smelted；
(2) refine, for molten steel desulfurizing, temperature adjustment and alloying, and be Dehydrogenation of Molten Steel and denitrogenation using ladle refining furnace；
(3) pour into a mould, protect ingot casting to pour into a mould using argon gas；
(4) cogging, forging or rolling-cogging；
(5) roll, the steel plate after cogging is rolled into 200-400mm thickness in milling train；
(6) it is heat-treated, by the steel plate through rolling through normalized treatment, normalizing process is air cooling or water after 890-930 DEG C of heating samming
It is cold；
Wherein, the minimum thickness of minimum ingot casting body is not less than 800mm, and total deformation ratio is not less than 3:1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510996876.0A CN105603303B (en) | 2015-12-25 | 2015-12-25 | A kind of high strength ultra-thick steel plates |
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| CN201510996876.0A CN105603303B (en) | 2015-12-25 | 2015-12-25 | A kind of high strength ultra-thick steel plates |
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| Publication Number | Publication Date |
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| CN105603303A CN105603303A (en) | 2016-05-25 |
| CN105603303B true CN105603303B (en) | 2017-06-23 |
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| CN107557677B (en) * | 2016-06-30 | 2019-02-26 | 鞍钢股份有限公司 | A kind of polar ocean platform E36 super-thick steel plate and its manufacturing method |
| CN111172448B (en) * | 2018-11-12 | 2021-09-24 | 中国科学院金属研究所 | Preparation method of thick, large and high-homogeneity plastic die steel |
| CN112553527B (en) * | 2020-11-27 | 2021-11-23 | 中天钢铁集团有限公司 | Method for controlling nitrogen content of 20CrMnTi series gear steel with high scrap steel ratio produced by electric furnace process |
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| CN103397251A (en) * | 2013-08-05 | 2013-11-20 | 武汉钢铁(集团)公司 | 150-190 mm thick bridge steel produced by continuous casting slab and technology thereof |
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| JPS60155620A (en) * | 1984-01-26 | 1985-08-15 | Kawasaki Steel Corp | Manufacture of steel plate for reactor container having superior falling characteristic |
| CN101871083A (en) * | 2010-06-14 | 2010-10-27 | 南阳汉冶特钢有限公司 | Ultra-thick low-alloy high-strength Q345-series steel plate and production method thereof |
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| CN103397251A (en) * | 2013-08-05 | 2013-11-20 | 武汉钢铁(集团)公司 | 150-190 mm thick bridge steel produced by continuous casting slab and technology thereof |
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