CN105950973A - Thick-specification X80 pipeline steel plate excellent in ultralow-temperature drop hammer performance and manufacturing method thereof - Google Patents
Thick-specification X80 pipeline steel plate excellent in ultralow-temperature drop hammer performance and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Abstract
The invention discloses a thick-specification X80 pipeline steel plate excellent in ultralow-temperature drop hammer performance. The thick-specification X80 pipeline steel plate comprises, by mass, 0.02%-0.06% of C, 1.45%-1.6% of Mn, 0.1-0.35% of Si, 0-0.0006% of S, 0-0.010% of P, 0.055%-0.08% of Nb, 0.008%-0.03% of Ti, 0-0.008% of V, 0-0.06% of Alt, 0-0.0040% of N, 0-0.004% of O, 0-0.30% of Mo, 0-0.0015% of Pb, 0-0.003% of Zn, 0-0.0015% of Sb, 0-0.0015% of Sn, 0-0.30% of Cu, 0.20%-1.5% of Ni, 0-0.35% of Cr, 0-0.01% of Ca, the balance Fe and inevitable impurity elements, and the sum of the Mo, the Cu, the Ni and the Cr is less than or equal to 1.5%. The thickness of the steel plate is 30 mm or above. The manufacturing process of the thick-specification X80 pipeline steel plate comprises the following steps of proportional material preparing, converter or electric furnace smelting, external refining, continuous casting, plate blank reheating, conducting of specific TMCP technology, stack cooling after cooling and strengthening. According to the thick-specification X80 pipeline steel plate excellent in the ultralow-temperature drop hammer performance and the manufacturing process, the low-temperature toughness of the X80 pipeline steel plate is further improved, especially, the ultralow-temperature drop hammer performance of the steel plate is remarkably improved, and the yield is high.
Description
Technical field
The present invention relates to X80 pipeline steel and manufacture method thereof, be specifically related to a kind of ultralow temperature block hammer performance excellence
Thickness is in the X80 pipeline steel of more than 30mm and manufacture method thereof, and the application is also applied for the pipe line steel of below X80 steel-grade.
Background technology
At present in the energy of world demand, fossil energy also accounts for the principal status of public economy in energy resource structure, in recent years World Economics
Increasing the growth rapidly greatly having driven fossil energy demand rapidly, this has been also greatly facilitate sending out of long distance delivery pipeline
Exhibition, for improving transfer efficiency, reduces investment, the development trend of distance petroleum gas delivering pipe line steel be to high intensity or
Superelevation grade of steel develops.The pipe line steel Hi-grade steel that countries in the world use at present is X80 steel-grade.For improving discharge pressure, X80 steel-grade
Developing to think gauge direction, current section of tubing has started to use thickness more than 30mm wall thickness X80 pipe line steel, and from now on can
A large amount of employings.
The domestic license of X80 pipe line steel or apply for a patent more, but relate to think gauge even ultra thick gauge X80 patent
And low temperature block hammer performance requires the most less, ultralow temperature block hammer performance requires the most substantially to have no report.
Plate Production mode is used to be applicable to produce 20-35 mm as Patent No. CN101845596B is mentioned this patent
Above X80 pipe line steel, this patent has following features: 1) upper S≤0.05% of composition design, S is harmful element, and actually thickness is low
All controlling 0.005% and less in 20mmX80 pipe line steel S content, it is the most special that too high S can seriously damage Pipeline Steel Toughness
Steel plate block hammer performance requirement；Ni≤0.20%, the toughness especially thickness improving pipe line steel is exceeded by the raising of usual Ni content
The X80 pipe line steel of 30mm is favourable；2) this patent critical process window in rolling mill practice is the widest, and this is to below 23mm grade of steel
Can affect less, but to pipe line steel above with 30mm thickness specification, then performance is difficult to ensure that, especially block hammer performance, applicant
It was verified that use this technique and composition to be difficult to meet thickness specification in more than 30mm block hammer performance requirement；
As the number of applying for a patent uses Plate Production mode to be applicable to produce thickness for mentioning this application patent in CN103225047A
Being not less than 26.5mm specification X80 pipe line steel, this application patent has following features: 1) require that Mo is not less than 0.15% in this patent,
In the case of ultra thick gauge, Mo increase can bring the sensitivity of the tissues such as a shellfish, and this is unfavorable to block hammer performance, increases the most accordingly simultaneously
Cost of alloy；Nb content is 0.025-0.055%, and too low Nb content is at heavy slab roll control Austenite Grain Growth and thin
Change effect produced by ferrite crystal grain aspect less；2) in rolling mill practice subsequently with Patent No. CN101845596B in carry
That arrives is similar, and process window is the widest, it is difficult to ensure that block hammer performance, this is also embodied in I puts into practice.
This patent is the bag carried out on the basis of the number of applying for a patent is for technical scheme disclosed in CN201510153571.3
Include composition, technologic innovation.Think gauge X80 pipe line steel particularly thickness specification more than 30mm thickness X80 pipe line steel due to needs
Low-temperature flexibility requirement, particularly temperature are not higher than-25 DEG C of DWTT and drop hammer section of shear requirement, are universally acknowledged technical barriers.
Summary of the invention
The technical problem to be solved is to provide one to produce thickness more than 30mm thickness for above-mentioned prior art
X80 Pipeline Steel Plate and manufacture method thereof, for obtaining ultra thick gauge ultralow temperature DWTT block hammer performance, in addition to composition designs, with greater need for
Using special producing technique in production technology, and this technique is the most terse, lumber recovery is higher, and obtains the ultralow of excellence
Temperature block hammer performance.
It practice, thickness specification is a universally acknowledged difficult problem at the block hammer performance of more than 30mm X80 pipe line steel, both domestic and external
Research shows, block hammer performance, in addition to the factors such as the tissue in steel and ambient temperature, also has close pass with the thickness of steel plate
System, and increase with thickness, the most sensitive to thickness！This is referred to as thickness effect！For solving the thickness effect under ultra thick gauge, need
It is designed from tissue, i.e. controls to be controlled on organization type and crystal grain thinning, simultaneously it is contemplated that other influences falls
Hammer influence factor's such as stress, residual elements and level of inclusions control etc..
The present invention, based on above-mentioned design philosophy, in conjunction with current equipment, proposes specific for obtaining specific tissue
Composition designs, and according to this composition characteristic, formulates specific TMCP technique (containing intermediate blank cooling technique) the cold technique of+heap.
The present invention solves the technical scheme that above-mentioned technical problem used, the thick rule that a kind of ultralow temperature block hammer performance is excellent
Lattice X80 pipeline steel, the chemical composition of this steel plate is C:0.02～0.06%, Mn:1.45～1.6% by mass percentage,
Si:0.1～0.35%, S :≤0.0006%, P :≤0.010%, Nb:0.055～0.08%, Ti:0.008～0.012%, V :≤
0.008%, Alt :≤0.06%, N :≤0.0040%, O :≤0.004%, Mo :≤0.30%, Pb≤0.0015%, Zn≤0.003%,
Sb≤0.0015%, Sn≤0.0015%, Cu :≤0.30%, Ni:0.20～1.5%, Cr :≤0.35%, Mo+Cu+Ni+Cr≤
1.5%, Ca :≤0.01%, surplus is Fe and inevitable impurity element；The thickness of described steel plate be 30mm and more than.
Further, the thickness of described steel plate is 30～35mm；Yield strength >=the 555Mpa of described steel plate；Tensile strength
>=670Mpa, yield tensile ratio≤0.82, pole sample elongation percentage >=25% ,-25 DEG C of ballistic work >=450J ,-40 DEG C of ballistic work >=400J ,-
60 DEG C of ballistic work >=350J ,-80 DEG C of ballistic work >=330J；-25 DEG C of section of shear >=85% that drop hammer ,-30 DEG C of sections of shear of dropping hammer >=
80% ,-48 DEG C of section of shear of dropping hammer >=60%(total wall thickness sample block hammer performances, if thinning sample block hammer performance is higher).
It is to use to fit that the present invention has the excellent think gauge X80 pipeline steel composition design principle of ultralow temperature block hammer performance
C, Mn of amount, by adding the micro alloying elements such as trace Nb, V, Ti, is simultaneously introduced the elements such as a small amount of Mo, Cu, Ni, in conjunction with special
Determine TMCP technique, in order to final guarantee ultra thick gauge X80 has low-temperature high-toughness, especially excellent DWTT block hammer performance, its
Main basic element effect is as follows:
C:C is intensified element most economical, most basic in steel, can significantly improve the strong of steel by solution strengthening and precipitation strength
Degree, but the toughness of steel and ductility and welding performance are brought adverse effect, therefore the development trend of pipe line steel is constantly to reduce C
Content, it is contemplated that intensity and the matching relationship of toughness, controls C content 0.02～0.06%.
: improved the intensity of steel by solution strengthening, be pipe line steel to make up cause loss of strength because C content reduces
Main element, Mn simultaneously or expands the element of γ phase region, it is possible to decrease γ → α phase transition temperature of steel, contributes to obtaining tiny
Phase-change product, can improve the toughness of steel, reduce tough brittle transition temperature, Mn is also the quenching degree element improving steel.Consider
Checkout procedure finding, block hammer performance is had a negative impact by Mn segregation, takes into account requirement of strength, Mn content in the present invention simultaneously
Design 1.45～1.6% scope.
: it is one of topmost micro alloying element in modern micro alloyed steel particularly pipe line steel, to crystal grain refinement
Effect is clearly.Nb(C, N by the solid solution towing of Nb and course of hot rolling) strain induced precipitate can hinder deformation Ovshinsky
The recovery and recrystallization of body, is changed into tiny phase-change product when TMCP makes deformed austeaite that Unhydrated cement rolls in phase transformation,
So that steel has high intensity and high tenacity, the present invention mainly determines Nb content range by the relation of C Yu Nb content,
V: there is higher precipitation strength and more weak Grain Refinement Effect, compound in tri-kinds of micro alloying elements of Nb, V, Ti
During use, V acts primarily as precipitation strength effect.
: being strong solid N element, the stoichiometric proportion of Ti/N is 3.42, utilizes the Ti of about 0.02% just can fix in steel
The N of below 60ppm, can form TiN precipitated phase during sheet billet continuous casting, and this tiny precipitated phase can effectively stop slab
The growing up of austenite crystal in heating process, is favorably improved Nb solid solubility in austenite, can improve sweating heat simultaneously
The impact flexibility of the zone of influence, is indispensable element in pipe line steel, but too high Ti can form big TiN particle, impact falls
Hammer performance, therefore Ti is controlled between 0.008-0.012% by the application patent.
: first separate out the formation of ferritic phase when can postpone γ → α phase transformation, promote the essential element that acicular ferrite is formed,
Play an important role to controlling phase transformation, be the most also the quenching degree element improving steel.At certain rate of cooling and final cooling temperature
Under by add certain Mo can obtain obvious acicular ferrite or bainite structure.
, P: be inevitable impurity element in pipe line steel, it is desirable to the lowest more good, processed by super-low sulfur and Ca and change sulfur
Compound form can make pipe line steel have the highest impact flexibility.
, Ni: can be improved the intensity of steel by solution strengthening, Ni adds the toughness that on the one hand can improve steel, improves simultaneously
The red brittleness that Cu easily causes in steel.
: the addition of Cr can improve the quenching degree of steel, and relatively economical.
Pb, Zn, Sb, Sn, these residual elements are easy to assemble at crystal boundary, weaken the adhesion between crystal boundary, thus affect
Block hammer performance, it is therefore desirable to control Pb≤0.0015%, Zn≤0.003%, Sb≤0.0015%, Sn≤0.0015%.
The method of the think gauge X80 pipeline steel that above-mentioned ultralow temperature block hammer performance is excellent,
Preparation flow: proportioning get the raw materials ready → carry out converter or electric furnace smelting → external refining → continuous casting → slab reheat → specific
After TMCP technique+cooling heap cold → aligning.
Concrete technology step is as follows: first by raw materials for metallurgy successively through KR molten iron pretreatment, converter smelting, LF refine, RH
Vacuum refining and continuous casting, produce meet chemical composition require, thickness be the continuous casting billet not less than 350mm；Continuous casting billet is added again
Heat to 1180～1230 DEG C, carry out specific T MCP technique+water-cooled+heap cold+aligning；
Specific T MCP technique includes two-phase control rolling and intermediate blank cooling: the first stage is recrystallization zone rolling, finishing temperature control
System is at 1050～1100 DEG C, and the single pass reduction ratio controlling continuous two to three passages during recrystallization zone rolling is not less than 22%；
Intermediate blank cooling is the non-recrystallization zone that intermediate blank appropriateness is cooled to second stage by intermediate blank appropriateness cooling system
Start rolling temperature, intermediate blank cools down in intermediate blank appropriateness cooling system in the way of swinging back and forth, and cooling rate speed is 6～12
DEG C/s, after this type of cooling is to ensure that recrystallization zone rolling deformation, austenite crystal is no longer grown up, and controls intermediate blank table well simultaneously
Face and the heart portion temperature difference；
Intermediate blank appropriateness cooling system, as it is shown in figure 1, this system be arranged on 4300mm wide and heavy plate mill production line roughing mill and
Between finishing mill.This system is body structure, the longest 18m, and at casing top, dense distribution spray spout, after roughing
Intermediate blank carries out appropriateness cooling, according to different workpiece thickness, it is thus achieved that intermediate blank rate of cooling be 4～18 DEG C/s, intermediate blank
Thickness is according to product and produces needs, generally about 40～180mm thickness, less than 40mm thickness intermediate blank due to relatively thin, unless needed
Want, be typically not required to carry out intermediate blank cooling.For think gauge intermediate blank, it is contemplated that design limit, maximum rate of cooling 4 DEG C/
S, for Thin Specs, maximum rate of cooling can reach 18 DEG C/s.Why can not use higher cooling rate, have two factors to need to examine
Worry to: one is owing to, under higher cooling rate, intermediate blank through-thickness can produce bigger temperature difference, this temperature difference rolling time
Owing to temperature difference causes Deformation in thickness uneven, steel plate can be produced during finish rolling rolling and upwarp or lower button, affect productivity ratio；Two
It is that this through-thickness temperature difference will cause through-thickness region austenite deformation different, thus it is final to affect acquisition
Tissue.
Blank is after roughing completes, according to producing needs, it may be judged whether open the cooling of intermediate blank appropriateness.Needs are used
Intermediate blank cooling system carries out the situation of appropriateness cooling, and intermediate blank is after entering intermediate blank appropriateness cooling system, corresponding in system
Roller-way enter weave mode, make intermediate blank swing back and forth in system, simultaneously nozzle spray to intermediate blank spray water, control in the middle of
Base is cooled to the start rolling temperature of second stage rolling with specific rate of cooling.
After the start rolling temperature that intermediate blank is cooled to second stage rolling, intermediate blank will be in intermediate blank appropriateness cooling system
Send, enter later procedure.
Second stage is the rolling of non-recrystallization zone, and start rolling temperature is not higher than 880 DEG C, and finishing temperature control is at phase transformation stagnation temperature
Degree Ar3 ± 15 DEG C.
With water-cooling pattern cooling metal sheets after rolling, begin to cool down temperature and control as not higher than 760 DEG C, terminate chilling temperature and control
Being 350～500 DEG C, rate of cooling is 10～30 DEG C/s；Steel plate heap is as cold as 300 ± 15 DEG C after terminating by water-cooled, aligning, the most directly
Connect and be cooled to room temperature and i.e. obtain steel plate finished product.
The present invention has a characteristic that
1) use suitable composition, produce the special think gauge X80 of more than 30mm, and with follow-up specific T MCP technique+heap cold technique phase
Coupling, produces the special think gauge X80 steel plate of more than 30mm, it is thus achieved that excellent low-temperature flexibility, particularly significantly improve-25 DEG C and with
The block hammer performance of lower temperature steel plate.
2) TMCP technique (carrying out intermediate blank cooling containing using mild cooling the cooling system)+steel of this invention improvement
Sheetpile is cold+heap cold after aligning, although add operation, but contribute to reducing cost of alloy, improve lumber recovery high.In TMCP technique
Process passes through the cooling quick to intermediate blank of mild cooling cooling system, it is ensured that Ovshinsky after first stage recrystallization zone deformation
Body crystal grain is no longer grown up, and controls intermediate blank surface and the heart portion temperature difference well simultaneously, improves ultra thick gauge Pipeline Steel Plate production efficiency.
3) special component and specific T MCP technique+cold rear aligning of retarded cooling process+heap is used thoroughly to solve ultra thick gauge X80
Ultralow-temperature flexibility and ultralow temperature block hammer performance require technical barrier.
Accompanying drawing explanation
Fig. 1 is the operation schematic diagram of the intermediate blank appropriateness cooling system of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
The manufacturing process of the think gauge X80 pipeline steel that ultralow temperature block hammer performance is excellent is: proportioning is got the raw materials ready → carried out and turns
After stove or electric furnace smelting → external refining → continuous casting → slab reheating → specific T MCP technique+cooling heap cold → aligning.
Concrete technology step is as follows: raw materials for metallurgy is true through KR molten iron pretreatment, converter smelting, LF refine, RH successively
Empty refine and continuous casting, produce and meet chemical composition requirement, the continuous casting billet of thickness 350mm；Continuous casting billet is again heated to 1180～
1230 DEG C, carry out specific T MCP technique+water-cooled+heap cold+aligning.
Specific T MCP technique includes two-phase control rolling and intermediate blank cooling: the first stage is recrystallization zone rolling, finish to gauge temperature
Degree controls at 1050～1100 DEG C, and the single pass reduction ratio controlling continuous two to three passages during recrystallization zone rolling is not less than 22%；
Intermediate blank cooling is by intermediate blank appropriateness cooling system, as it is shown in figure 1, intermediate blank is quickly cooled to second stage
Non-recrystallization zone start rolling temperature, intermediate blank cools down in intermediate blank appropriateness cooling system casing in the way of swinging back and forth,
Cooling rate is 6-12 DEG C/s, it is ensured that after recrystallization zone rolling deformation, austenite crystal is no longer grown up, intermediate blank surface and the heart portion temperature difference
Less；
Second stage is the rolling of non-recrystallization zone, and start rolling temperature is not higher than 880 DEG C, and finishing temperature control is in phase transformation critical temperature
Near Ar3.
With water-cooling pattern cooling metal sheets after rolling, begin to cool down temperature and control as not higher than 760 DEG C, terminate chilling temperature and control
Being 350～500 DEG C, rate of cooling is 10～30 DEG C/s；Steel plate heap is as cold as 300 ± 15 DEG C after terminating by water-cooled, aligning, the most directly
Connect and be cooled to room temperature and i.e. obtain steel plate finished product.
The specific chemical composition of steel plate involved by each embodiment is shown in Table 1, and concrete TMCP technological parameter is shown in Table 2, main mechanical
Performance is shown in Table 3.
Table 1
Table 2
Table 3
Compared with the prior art of Patent No. CN201510153571.3, the application further increases X80 pipe line steel
By the low-temperature flexibility of steel plate, the most notable ultralow temperature block hammer performance that improve steel, lumber recovery is high.
Claims (5)
1. the think gauge X80 pipeline steel that a ultralow temperature block hammer performance is excellent, it is characterised in that: the chemical composition of this steel plate
It is C:0.02～0.06%, Mn:1.45～1.6% by mass percentage, Si:0.1～0.35%, S :≤0.0006%, P :≤
0.010%, Nb:0.055～0.08%, Ti:0.008～0.03%, V :≤0.008%, Alt :≤0.06%, N :≤0.0040%, O:
≤ 0.004%, Mo :≤0.30%, Pb≤0.0015%, Zn≤0.003%, Sb≤0.0015%, Sn≤0.0015%, Cu :≤
0.30%, Ni:0.20～1.5%, Cr :≤0.35%, Mo+Cu+Ni+Cr≤1.5%, Ca :≤0.01%, surplus is Fe and can not
The impurity element avoided；The thickness of described steel plate be 30mm and more than.
The think gauge X80 pipeline steel that ultralow temperature block hammer performance the most according to claim 1 is excellent, it is characterised in that:
The thickness of described steel plate is 30～35mm；Yield strength >=the 555Mpa of described steel plate；Tensile strength >=670Mpa, yield tensile ratio≤
0.82, pole sample elongation percentage >=25% ,-25 DEG C of ballistic work >=450J ,-40 DEG C of ballistic work >=400J ,-60 DEG C of ballistic works >=
350J ,-80 DEG C of ballistic work >=330J；-25 DEG C of section of shear >=85% that drop hammer ,-30 DEG C of section of shear >=80% that drop hammer ,-48 DEG C fall
The hammer section of shear >=60%.
3. the side manufacturing the excellent think gauge X80 pipeline steel of ultralow temperature block hammer performance as claimed in claim 1 or 2
Method, it is characterised in that: processing step is as follows: first by raw materials for metallurgy successively through KR molten iron pretreatment, converter smelting, LF refine,
RH vacuum refining and continuous casting, produce meet chemical composition require, thickness be the continuous casting billet not less than 350mm；By continuous casting billet again
Be heated to 1180～1230 DEG C, carry out specific T MCP technique+water-cooled+heap cold+aligning；
Specific T MCP technique includes two-phase control rolling and intermediate blank cooling: the first stage is recrystallization zone rolling, finishing temperature control
System is at 1050～1100 DEG C, and the single pass reduction ratio controlling continuous two to three passages during recrystallization zone rolling is not less than 22%；
Intermediate blank cooling is the non-recrystallization zone that intermediate blank appropriateness is cooled to second stage by intermediate blank appropriateness cooling system
Start rolling temperature, intermediate blank cools down in intermediate blank appropriateness cooling system in the way of swinging back and forth, and cooling rate speed is 6～12
℃/s；Second stage is the rolling of non-recrystallization zone, and start rolling temperature is not higher than 880 DEG C, and finishing temperature control is in phase transformation critical temperature
Ar3±15℃；
With water-cooling pattern cooling metal sheets after rolling, beginning to cool down temperature and control as not higher than 760 DEG C, terminating chilling temperature control is
400～500 DEG C, rate of cooling is 10～30 DEG C/s；Steel plate heap is as cold as 300 ± 15 DEG C after terminating by water-cooled, aligning, the most directly
It is cooled to room temperature and i.e. obtains steel plate finished product.
The manufacture method of the think gauge X80 pipeline steel that ultralow temperature block hammer performance the most according to claim 3 is excellent, its
Be characterised by: described intermediate blank appropriateness cooling system be arranged on the roughing mill of 4300mm wide and heavy plate mill production line and finishing mill it
Between, this system is body structure, the longest 18m, at casing top, dense distribution spray spout, enters the intermediate blank after roughing
Row appropriateness cooling, according to different workpiece thickness, it is thus achieved that intermediate blank rate of cooling be 4～18 DEG C/s, workpiece thickness according to
Product and production need generally about 40～180mm thickness, less than 40mm thickness intermediate blank due to relatively thin, unless needed for, the most not
Need to carry out opening the cooling of intermediate blank appropriateness；For think gauge intermediate blank, it is contemplated that design limit, maximum rate of cooling at 4 DEG C/s,
For Thin Specs, maximum rate of cooling can reach 18 DEG C/s.
The manufacture method of the think gauge X80 pipeline steel that ultralow temperature block hammer performance the most according to claim 4 is excellent, its
It is characterised by: the work flow of described intermediate blank appropriateness cooling system: blank obtains intermediate blank after roughing completes, according to production
Need, it may be judged whether open the cooling of intermediate blank appropriateness, during for needing to use intermediate blank cooling system to carry out appropriateness cooling,
Intermediate blank is after entering intermediate blank appropriateness cooling system, and in system, corresponding roller-way enters weave mode, makes intermediate blank in system
Inside swinging back and forth, intermediate blank is sprayed water by nozzle spray simultaneously, controls intermediate blank and is cooled to second stage with specific rate of cooling
The start rolling temperature of rolling, after the start rolling temperature that intermediate blank is cooled to second stage rolling, intermediate blank will be cold from intermediate blank appropriateness
But send in system, enter later procedure.
Priority Applications (1)
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| CN107099743A (en) * | 2017-04-01 | 2017-08-29 | 江阴兴澄特种钢铁有限公司 | Ultra thick gauge high tenacity X100 superelevation grade pipeline steel plates and preparation method thereof |
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| CN110983203A (en) * | 2019-12-13 | 2020-04-10 | 首钢集团有限公司 | 420 MPa-level low-temperature anti-seismic weather-resistant bridge steel and preparation process thereof |
| CN112126758A (en) * | 2020-09-25 | 2020-12-25 | 东北大学 | Toughening regulation and control method for super-thick steel plate |
| WO2022062574A1 (en) * | 2020-09-25 | 2022-03-31 | 东北大学 | Toughening regulation method for super-thick steel plate |
| CN113502435A (en) * | 2021-06-30 | 2021-10-15 | 本钢板材股份有限公司 | Oil casing pipe steel for improving low-temperature impact toughness and preparation method thereof |
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