CN104988435B - Low-carbon high-tenacity super-thick steel plate and manufacturing method thereof - Google Patents
Low-carbon high-tenacity super-thick steel plate and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a large-thickness high-tenacity vessel steel plate, comprising the following chemical components by mass percent: 0.08 to 0.12 percent of C, 0.15 to 0.40 percent of Si, 0.40 to 0.70 percent of Mn, smaller than or equal to 0.005 percent of P, smaller than or equal to 0.003 percent of S, smaller than or equal to 0.40 percent of Ni, smaller than or equal to 0.20 percent of Cu, 0.80 to 1.20 percent of Cr, 0.45 to 0.60 percent of Mo, smaller than or equal to 0.003 percent of Sb, smaller than or equal to 0.010 percent of Sn, smaller than or equal to 0.012 percent of As, smaller than or equal to 0.0002 of H and the balance of Fe and investable impurity elements. The prepared low-carbon high-tenacity steel plate has the advantages that the thickness can reach 100 to 110 mm, the core part performance is excellent, particularly a low-temperature impact value at minus 38 DEG C is over 120J, and the Z-direction performance is good and is higher than the highest requirement, namely Z-direction performance being 35 percent, of a standard steel plate.
Description
Technical field
The invention belongs to steel plate manufacture field, and in particular to a kind of thickness is the special thick appearance of low carbon and high ductility of 100～110mm
Device steel plate and its manufacture method.
Background technology
With the fast development of the industries such as China's oil chemical industry, Coal Chemical Industry, the design and manufacture of pressure vessel are just towards big
Thickness, high parameter direction are developed, and this safety to pressure vessel is put forward higher requirement, for manufacture pressure vessel is used
The performance and specification of steel plate proposes harsher requirement.Wherein 1Cr0.5Mo as high temperature steels for pressure vessel use, quite
The trade mark SA387Gr12CL2 in trade mark 15CrMoR and ASME SA387-2013 in GB713-2014, by its good high temperature
Mechanical property, high temperature oxidation resistance, corrosion resistance, processing performance and solderability, be widely used in manufacture oil, chemical industry,
The use conditions such as coal conversion, nuclear power are harsh, the large-scale hydrogen-contacting equipment that corrosive medium is complicated.But steel grade 100mm is with upper steel plate
Low-temperature flexibility it is poor, be typically only capable to ensure, higher than -10 DEG C of low temperature impact properties, to have had a strong impact on the steel and faced in extremely frigid zones
Use on hydrogen storage equipment, therefore how by rational composition design and preparation method, produce less than -10 DEG C low temperature punchings of satisfaction
Ten points of 1Cr0.5Mo for hitting performance requirement is necessary.
The content of the invention
The technical problem to be solved is that to provide a kind of thickness for above-mentioned prior art be 100～110mm
Low-carbon (LC) tank plate, for manufacturing hydrogenation reactor, gasification furnace, change furnace etc., with extremely low carbon content, higher -38 DEG C
Low-temperature impact toughness, Z-direction performance, especially with preferable anti-temper embrittlement ability and meet the low temperature of Simulated post-weld heat treatment
The requirement that impact flexibility does not substantially weaken.
Another technical problem to be solved by this invention is to provide a kind of manufacture above-mentioned thickness for above-mentioned state of the art
The manufacture method of tank plate.
The present invention solves the technical scheme that adopted of above-mentioned technical problem for a kind of, low carbon and high ductility super-thick steel plate, the steel
It is C by mass percentage that the chemical composition of plate is the chemical composition of the steel plate by mass percentage：0.08～0.12%, Si：
0.15～0.40%, Mn：0.40～0.70%, P：≤ 0.005%, S：≤ 0.003%, Ni：≤ 0.40%, Cu：≤ 0.20%, Cr：
0.80～1.20%, Mo：0.45～0.60%, Sb：≤ 0.003%, Sn：≤ 0.010%, As：≤ 0.012%, H：≤ 0.0002%,
Balance of Fe and inevitable impurity element.The thickness of the steel plate reaches 100～110mm.
Further, low carbon and high ductility super-thick steel plate of the invention, -38 DEG C of its center portion horizontal Charpy-V impact power >=120J, Z
To performance >=50%.
What the chemical composition of low carbon and high ductility super-thick steel plate of the present invention was related such that:
In steel plate composition, C can increase quenching degree and significantly improve the intensity and hardness of steel plate, but to plasticity and toughness
Adversely affect, in order to ensure -38 DEG C of low temperature impact properties, C content is controlled in 0.08-0.12%；Si mainly as steel-making when
Reducing agent and deoxidizer are used, and have certain solution strengthening effect, but the low-temperature flexibility of steel such as can be caused more than 0.80% to reduce,
So Si is controlled 0.30% or so；Mn improves the intensity of steel by solution strengthening, also favourable to toughness；Ni can improve steel
Toughness and plasticity, while also increasing intensity, the Ni of the present invention is controlled below 0.20%；The quenching degree that Cr can be greatly improved, improves
The intensity and hardness of steel, but while the toughness and plasticity of reduction steel, improve temper resistance；Mo is present in solid solution and carbide
In, quenching degree and intensity can be improved, temper resistance is improved；Sb, Sn, As are harmful elements, easily in cyrystal boundary segregation, reduce steel
Anti- temper embrittlement performance, should reduce as far as possible；Nb formation Nb (N, C) precipitated phase raising recrystallization temperatures, fining austenite grains,
The intensity and toughness of steel can be effectively improved；P, S are harmful elements, and the fragility of P increase steel, the welding performance of reduction steel reduce modeling
Property and cold-forming property, S reduces the ductility and toughness of steel, causes crackle in hot procedure, therefore reduces P, S as far as possible and contain
Amount；H increases the hydrogen embrittlement tendency of steel, should reduce its content as far as possible.
The present invention solves the technical scheme of another technical problem and is to provide a kind of system of above-mentioned low carbon and high ductility super-thick steel plate
Method is made, converter smelting continuous casting, heating rolling, heat treatment step are specific as follows：
（1）Smelt continuous casting：Raw materials for metallurgy Jing KR molten iron pretreatment successively, converter smelting：Converter tapping P≤0.008%, turns
Stove tapping temperature is 1610～1650 DEG C, takes off Slag treatment；LF refines：The white slag retention time is not less than 25min, total refining time
Not less than 45min, skim during molten steel S≤0.003%；RH vacuum deaeration refinings：Vacuum≤0.5mbar, vacuum retention time exist
Sky is broken during more than 25min；Continuous casting：The continuous casting billet for meeting that chemical composition is required, thickness is 370mm or more is produced, to continuous casting
Base covering slow cooling more than 72 hours, covering be for the H content for further reducing steel billet, slow cooling terminate after to continuous casting billet surface band
Temperature cleaning, it is ensured that continuous casting billet surface flawless etc. affect plate surface quality defect exist, cleaning temperature be maintained at 100 DEG C with
On.
（2）Heating rolling：Continuous casting billet bringing-up section temperature be 1200～1260 DEG C, start rolling temperature be 1020～1100 DEG C, front 3
To the single pass rolling reduction 40mm～65mm of 5 passages, the overall compression ratio of rolling is >=3,800～900 DEG C of finishing temperature；Roll
Cheng Hou, steel plate offline, covering heap slow cooling in 400～500 DEG C of surface temperature, slow cooling more than 72 hours, slow cooling to room temperature, steel plate
The purpose for rolling rear slow cooling is the H content for fully reducing remaining in steel plate, reduces the harm of H.
（3）Heat treatment step：Steel plate is quenched and tempering heat treatment, quenching temperature is 910～940 DEG C, is quenched
Fiery temperature retention time is 1.8～2.5min/mm, is quickly cooled to less than 200 DEG C with water after coming out of the stove；Tempering heating-up temperature be 710～
750 DEG C, tempering insulation time is 2.5～4.0min/mm, is cooled down after coming out of the stove in atmosphere, obtains steel plate finished product.
Compared with prior art, the present invention has following features：
The present invention is, for the super-thick steel plate for obtaining low carbon and high ductility, to be allowed to be suitable to make pressure vessel such as hydrogenation reaction
Device, change furnace etc..Steel plate carbon content（0.08-0.12%）Less than existing steel plate（0.12-0.18%）Carbon content, be greatly enhanced
Low-temperature flexibility and welding performance, can not only still keep very high ballistic work at -38 DEG C, at the same also meet steel plate room temperature and
The requirement of high temperature tensile strength, Jing inspections, steel plate is in the low temperature after maximum analog postwelding and minimum Simulated post-weld heat treatment
Toughness and intensity are not decreased obviously, and have fully met the requirement for facing hydrogen steel.
To achieve these goals, chemical composition of the present invention using optimization, reduces harmful element content as far as possible, controls P
≤ 0.005%, S≤0.003%, As≤0.012%, Sb≤0.003%, Sn≤0.010%, it is ensured that above element continuous casting, rolling or
There is no macrosegregation in heat treatment process and cause grain-boundary strength to decline and reduce low-temperature flexibility and intensity.
In the stage of smelting, by LF refining and RH vacuum outgass, hydrogen content is made to drop to below 1ppm, it is ensured that steel plate has
Higher resistance against hydrogen cracking ability, reduces impact of the hydrogen embrittlement to steel plate low-temperature flexibility as far as possible.In the continuous casting billet of converter smelting production
Quality such as defect such as center segregation, center porosity in portion's is curbed, and contributes to steel plate and obtains excellent center portion performance.
Technique of the heat treatment of steel plate of the present invention using quenching+tempering, obtains uniform without the uniform bayesian being mingled with after quenching
Body organize, then by rational temper allow steel through thickness direction obtain uniform bainite tempered structure and
Tiny carbide, so that it is guaranteed that the center portion low-temperature impact toughness of steel plate, room temperature tensile and Z-direction function admirable.
The low carbon and high ductility steel plate thickness of present invention manufacture is up to 100～110mm, especially center portion excellent performance, -38 DEG C
More than cold impact value 120J, Z-direction function admirable have exceeded peak demand of the standard to steel plate Z-direction performance 35%, have shown the steel
The compactness of material is very high, meets the rigors to big thickness steel center portion performance；Steel plate is through Simulated post-weld heat treatment
Afterwards, tissue still keeps uniform, and center portion stretching and center portion impact property still meet steel performance requirement without substantially fluctuation.Additionally, phase
The preparation method answered has the advantages that low cost, with short production cycle, easy to utilize.
Specific embodiment
With reference to embodiments the present invention is described in further detail.
Embodiment 1
The thickness of the low carbon and high ductility super-thick steel plate of the present embodiment is 108mm, and its chemical composition is by mass percentage：
C：0.08%, Si：0.20%, Mn：0.45%, P：0.004%, S：0.002%, Ni：0.38%, Cr：1.10%, Cu：0.03%, Mo：
0.55%, Sb：0.001%, Sn：0.001%, As：0.001%, H：0.00008%, O：0.0014%, N：0.0032%, balance of Fe
And inevitable impurity element.
The manufacturing process of the steel plate is, by the chemical constituent configuration raw materials for metallurgy of above-mentioned steel plate finished product,（1）Smelt continuous casting：
Raw materials for metallurgy Jing KR molten iron pretreatment successively, converter smelting：Converter tapping P≤0.008%, converter tapping temperature be 1610～
1650 DEG C, take off Slag treatment；LF refines：The white slag retention time be not less than 25min, total refining time be not less than 45min, molten steel S≤
Skim when 0.003%；RH vacuum deaeration refinings：Vacuum≤0.5mbar, vacuum retention time break sky in more than 25min；Even
Casting：The continuous casting billet for meeting that chemical composition is required, thickness is 370mm is produced, to continuous casting billet covering slow cooling more than 72 hours, covering
It is that, for the H content for further reducing steel billet, slow cooling is cleared up to continuous casting billet surface band temperature after terminating, it is ensured that continuous casting billet surface is without splitting
Stricture of vagina etc. affects the defect of plate surface quality to exist, and cleaning temperature is maintained at more than 100 DEG C.（2）Heating rolling：Continuous casting billet is heated
Duan Wendu is 1200～1260 DEG C, and start rolling temperature is 1020～1100 DEG C, single pass rolling reduction 40mm of front 3 to 5 passage～
65mm, the overall compression ratio of rolling is >=3,800～900 DEG C of finishing temperature；After the completion of rolling, steel plate is in surface temperature 400～500
DEG C when offline, covering heap slow cooling, slow cooling more than 72 hours, slow cooling to room temperature, it is fully to reduce steel that steel plate rolls the purpose of rear slow cooling
The H content remained in plate, reduces the harm of H.（3）Heat treatment step：Steel plate is quenched and tempering heat treatment, Quench heating
Temperature is 930 DEG C, and Quenching Soaking Time is 2.0min/mm, is quickly cooled to less than 200 DEG C with water after coming out of the stove；Tempering heating temperature
Spend for 730 DEG C, tempering insulation time is 3.5min/mm, is cooled down after coming out of the stove in atmosphere, obtain steel plate finished product.
There is very high low-temperature impact via 108mm obtained in above-mentioned manufacturing process thick low carbon and high ductility tank plate
Work(and numerical fluctuations are less, steel plate imposite mechanical property are uniform, and excellent combination property, its mechanical performance refer to Tables 1 and 2.
Embodiment 2
The thickness of the low carbon and high ductility tank plate of the present embodiment is 108mm, and its chemical composition is by mass percentage：
C：0.10%, Si：0.30%, Mn：0.50%, P：0.002%, S：0.001%, Ni：0.25%, Cr：0.9%, Cu：0.03%, Mo：
0.60%, Sb：0.001%, Sn：0.001%, As：0.001%, H：0.00008%, O：0.0014%, N：0.003%, balance of Fe and
Inevitable impurity element.
The production method of steel plate is essentially identical with the production method of embodiment 1, but the state of inspection sample blanks has differences,
Concrete difference is as follows：
In order to simulate stress-removal heat treatment process after steel plate welding, after sample blanks is taken off from steel plate, first in bogey
In be incubated 4 hours according to 675 DEG C, i.e., then minimum Simulated post-weld heat treatment carries out mechanical properties test again.
Experiment is proved：The steel plate of the present invention has very high low-temperature impact work and numerical fluctuations are less, and yield strength >=
400MPa, tensile strength >=450MPa.Steel plate imposite mechanical property is uniform, compared with before Simulated post-weld heat treatment, without substantially
Reduce, refer to table 1, table 2.
Embodiment 3
The thickness of the low carbon and high ductility tank plate of the present embodiment is 108mm, and its chemical composition is by mass percentage：
C：0.11%, Si：0.20%, Mn：0.6%, P：0.004%, S：0.002%, Ni：0.32%, Cr：1.15 %, Cu：0.03%, Mo：
0.45%, Sb：0.001%, Sn：0.001%, As：0.001%, H：0.0001%, O：0.0012%, N：0.0032%, balance of Fe and
Inevitable impurity element.
Steel plate is that production method is essentially identical with the production method of embodiment 1, but the state of inspection sample blanks has differences,
Concrete difference is as follows：
In order to simulate stress-removal heat treatment process after steel plate welding, after sample blanks is taken off from steel plate, first in bogey
According to 675 DEG C be incubated 12 hours, i.e. then maximum analog post weld heat treatment carries out mechanical properties test again.
Experiment is proved：The steel plate of the present invention has very high low-temperature impact work and numerical fluctuations are less, and yield strength >=
290MPa, tensile strength >=550MPa.Steel plate imposite mechanical property is uniform, compared with before Simulated post-weld heat treatment, without substantially
Reduce, refer to table 1, table 2.
The mechanical performance of the steel plate produced by 1 each embodiment of table
The high-temperature behavior of the steel plate produced by 2 each embodiment of table
Claims (2)
1. a kind of manufacture method of low carbon and high ductility super-thick steel plate, it is characterised in that：The chemical composition of steel plate is by mass percentage
It is calculated as C：0.08～0.12%, Si：0.15～0.40%, Mn：0.40～0.70%, P：≤ 0.005%, S：≤ 0.003%, Ni：≤
0.40%, Cu：≤ 0.20%, Cr：0.80～1.20%, Mo：0.45～0.60%, Sb：≤ 0.003%, Sn：≤ 0.010%, As：≤
0.012%, H：≤ 0.0002%, balance of Fe and inevitable impurity element；
Processing step is as follows：
（1）Smelt continuous casting：Raw materials for metallurgy Jing KR molten iron pretreatment successively, converter smelting：Converter tapping P≤0.008%, converter go out
Furnace temperature is 1610～1650 DEG C, takes off Slag treatment；LF refines：The white slag retention time is not less than 25min, and total refining time is not little
Skim when 45min, molten steel S≤0.003%；RH vacuum deaeration refinings：Vacuum≤0.5mbar, vacuum retention time exist
Broken sky after more than 25min；Continuous casting：The continuous casting billet for meeting that chemical composition is required, thickness is 370mm or more is produced, to continuous casting
Base covering slow cooling more than 72 hours, slow cooling are cleared up to continuous casting billet surface band temperature after terminating, and cleaning temperature is maintained at more than 100 DEG C；
（2）Heating rolling：Continuous casting billet is heated to 1200～1260 DEG C, and start rolling temperature is controlled at 1020～1100 DEG C, front 3 to 5 road
Secondary single pass rolling reduction 40mm～65mm, the overall compression ratio of rolling is >=3,800～900 DEG C of finishing temperature；After the completion of rolling,
Steel plate offline, covering heap slow cooling in 400～500 DEG C of surface temperature, slow cooling more than 72 hours, slow cooling is to room temperature；
（3）Heat treatment step：Steel plate is quenched and tempering heat treatment, quenching temperature is 910～940 DEG C, and quenching is protected
The warm time is 1.8～2.5min/mm, is quickly cooled to less than 200 DEG C with water after coming out of the stove；Tempering heating-up temperature is 710～750
DEG C, tempering insulation time is 2.5～4.0min/mm, is cooled down after coming out of the stove in atmosphere, obtains steel plate finished product.
2. the manufacture method of low carbon and high ductility super-thick steel plate according to claim 1, it is characterised in that：The thickness of steel plate is
100～110mm.
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| CN101713051B (en) * | 2009-12-28 | 2011-11-16 | 舞阳钢铁有限责任公司 | Hydrogen steel plate with thickness of 100mm and preparation method thereof |
| CN101831586A (en) * | 2010-04-30 | 2010-09-15 | 南京钢铁股份有限公司 | Low-carbon equivalent weight high-strength thick steel plate with excellent low-temperature toughness and manufacture method |
| CN102345066B (en) * | 2011-10-21 | 2013-06-19 | 莱芜钢铁集团有限公司 | Steel used for pressure container and preparation method thereof |
| CN102409236B (en) * | 2011-11-14 | 2012-12-19 | 湖南华菱湘潭钢铁有限公司 | Method for producing super-thick steel plate |
| CN102605297B (en) * | 2012-03-15 | 2014-04-30 | 宝山钢铁股份有限公司 | High low-temperature impact toughness thick steel plates for hydrogen-contacting equipment and production method thereof |
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| CN103710628A (en) * | 2013-12-30 | 2014-04-09 | 南阳汉冶特钢有限公司 | Large-thickness hydrogenating 14Cr1MoR steel plate and production method thereof |
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