CN105624553A - High-strength steel plate with improved low-temperature impact toughness and manufacturing method thereof - Google Patents

High-strength steel plate with improved low-temperature impact toughness and manufacturing method thereof Download PDF

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CN105624553A
CN105624553A CN201511019835.2A CN201511019835A CN105624553A CN 105624553 A CN105624553 A CN 105624553A CN 201511019835 A CN201511019835 A CN 201511019835A CN 105624553 A CN105624553 A CN 105624553A
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steel
rare earth
inclusion
steel plate
temperature
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CN105624553B (en
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赖朝彬
陈英俊
冯小明
孙乐飞
操瑞宏
汪志刚
邓志豪
习小军
吴绍杰
付军
赵和明
袁传泉
傅清霞
王国文
杨清
朱福生
吴春红
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Jiangxi University of Science and Technology
Xinyu Iron and Steel Co Ltd
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Jiangxi University of Science and Technology
Xinyu Iron and Steel Co Ltd
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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
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • 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
    • C21D8/0221—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
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
    • 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

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  • Chemical & Material Sciences (AREA)
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  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a high-strength steel plate with improved low-temperature impact toughness. The high-strength steel plate is manufactured from the chemical ingredients comprising, by mass percent, 0.07% to 0.19% of C, 0.15% to 0.45% of Si, 1.15% to 1.65% of Mn, not larger than 0.025% of P, not larger than 0.008% of S, not larger than 0.04% of Nb, not larger than 0.20% of V, not larger than 0.015% of Ti, 0.005% to 0.030% of Alt, not larger than 0.020% of N, 0.002% to 0.003% of O, 0.005% to 0.010% of Y, 0.015% to 0.025% of Ce and the balance Fe, rare earth and inevitable impurities. The rare earth is yttrium-based rare earth, and a composite inclusion component in steel comprises, by mass percent, 25.72% to 69.15% of Y and 3.09% to 17.52% of Ce. The matrix structure of the steel plate is a fine ferritic and pearlitic structure. The yttrium-based rare earth is used for achieving the functions of purifying, denaturating, microalloying and oxide metallurgy in the steel, and the low-temperature impact toughness of the high-strength steel plate is improved.

Description

A kind of high tensile steel plate and manufacture method thereof improving low-temperature impact toughness
Technical field
The present invention relates to a kind of high tensile steel plate and manufacturing technology thereof, in particular to a kind of high tensile steel plate and the manufacture method thereof of improving low-temperature impact toughness.
Background technology
Along with development and the technical progress of society, the performance of self steel plate used be it is also proposed requirements at the higher level by every profession and trade, in order to the deadweight of lightening material, it is desired to steel plate has higher intensity; In order to expand environment for use and the Application Areas of material, it is desired to steel plate has good low-temperature flexibility; In order to facilitate the manufacture of material to process, also requiring that steel plate has certain weldability, therefore, the demand of high strength steel plate is increasing. High tensile steel plate typically refers to the steel plate that yield strength is greater than 315MPa, applies very general in shipbuilding, ocean platform, building structure, bridge, pressurized vessel, gas pipeline field. Particularly boats and ships and ocean platform, ocean environment is severe, except bearing gravity loading, also to be considered the impact of wind loading, wave loading, ocean current load, ice load etc., user expects while proof strength, and particularly low-temperature impact toughness is more high more good for impelling strength. Existing steel-smelting technology progress, although can oxygen in steel, sulphur be controlled in lower scope, but still unavoidably there are some defects: such as component segregation of continuous casting slab, sulfide, oxide compound precipitate out at crystal boundary, form calcium aluminate, manganese sulfide, magnesium oxide, aluminate, if inner inclusion owner strip MnS after this kind of continuous casting billet milling, a small amount of string-like Al2O3And aluminate, these inclusiones are very big on the impact of impact property particularly transverse impact performance, and further removal of inclusions, the means improving low-temperature impact toughness are limited. For this reason, the high tensile steel plate that a kind of low temperature (less than-40 DEG C) impelling strength of research is excellent and manufacture method thereof are the directions that metallurgical worker makes great efforts.
Summary of the invention
For prior art Problems existing, it is an object of the invention to provide one utilizes Yttrium base rare earth silicon calcium alloy to carry out cleaning molten steel, strengthening inclusion modification, refinement matrix, thus improve a kind of high tensile steel plate and manufacture method thereof improving low-temperature impact toughness of low-temperature impact toughness.
A kind of high tensile steel plate improving low-temperature impact toughness, its chemical composition by mass percent is: C:0.07%��0.19%, Si:0.15%��0.45%, Mn:1.15%��1.65%, P��0.025%, S��0.008%, Nb��0.04%, V��0.20%, Ti��0.015%, Ni��0.40%, Cr��0.10%, Cu��0.10%, Mo��0.08%, Alt:0.005%��0.030%, N��0.020%, O:0.002%��0.003%, its surplus is iron Fe, rare earth and inevitable impurity, it is characterized in that, described rare earth is Yttrium base rare earth, solid solution Y:0.005%��0.010% in steel, solid solution Ce:0.015%��0.025%, remaining inclusion in steel and combine the complex inclusion form existence forming small and dispersed with Y, Ce and O, Mg, Al, S, comprising Y, Ce mass percent in described complex inclusion component is: Y:25.72%��69.15%, Ce:3.09%��17.52%, steel matrix is organized as tiny ferrite+pearlitic structure.
Described complex inclusion component also comprises CaS inclusion.
The general thought of the present invention impels steel inclusion to float sooner by adding Yttrium base rare earth silicon calcium alloy on conventional steel grade basis, and effectively control residual sulphur compound, oxide form further, eliminate MnS inclusion harm effect in steel, Yttrium base rare earth is made to play the effect of purification, sex change, microalloying and oxide compound metallurgy in steel, final stay in steel Y, Ce simple substance and small and dispersed based on Y, Ce be auxiliary complex inclusion, this kind of matrix improves steel plate low-temperature impact toughness greatly.
A manufacture method for the special high tensile steel plate in improving low-temperature impact toughness, its processing step:
1), converter smelting: adopting top and bottom complex blowing oxygen coverter to smelt, deoxidation alloying in tapping process, Control for Oxygen Content is at 32��68ppm;
2), LF stove refining: after molten steel enters refining station, argon bottom-blowing, add lime simultaneously, refining slag and submerged arc slag, then be energized intensification, heat up after 8 minutes, survey temperature, sampling, carry out trimming, simultaneously according to the situation of top slag, add calcium carbide and aluminium grain makes white slag, the white slag hold-time is greater than 15 minutes, and then carry out surveying temperature, sampling, fine setting alloying constituent, treat liquid steel temperature, after composition is up to standard, feeding calcium line, after 1��2 minute, again with the speed feeding Yttrium base rare earth silicon calcium alloy claded wire 300m��500m of 2��3m/s, line feeding carries out soft blow argon after terminating, soft argon blowing time 8��15 minutes, promote that inclusion fully floats and enter slag, obtain its mass percent of molten steel composition in following scope: C:0.07%��0.19%, Si:0.15%��0.45%, Mn:1.15%��1.65%, P��0.025%, S��0.008%, Nb��0.04%, V��0.20%, Ti��0.015%, Ni��0.40%, Cr��0.10%, Cu��0.10%, Mo��0.08%, Alt:0.005%��0.030%, N��0.020%, O:0.002%��0.003%, solid solution Y:0.005%��0.010% in steel, solid solution Ce:0.015%��0.025%, remaining inclusion in steel and combine the complex inclusion form existence forming small and dispersed with Y, Ce and O, Mg, Al, S, comprising Y, Ce mass percent in described complex inclusion component is: Y:25.72%��69.15%, Ce:3.09%��17.52%, its surplus is iron Fe and inevitable impurity,
3), Lian Zhu: refining terminates, and molten steel is delivered to continuous casting workshop and carries out even casting slab, tundish temperature 1515 DEG C��1540 DEG C, and slab casting speed control adopts weak cold at 0.72��0.90m/min, secondary cooling water, air-water spraying cooling;
4), heating cycle: in process furnace, continuously cast bloom being heated to 1215��1236 DEG C, heating total time controls by 1.15��1.25 minutes/mm, soaking time >=185min;
5), rolling technology: adopt two-stage control rolling, start rolling temperature >=1060 DEG C of recrystallization zone rolling, rolling every time draft in recrystallization zone controls 28%��38%, intermediate blank treats temperature on roller-way, the start rolling temperature of Unhydrated cement rolling 840��880 DEG C, finishing temperature 808��838 DEG C, the accumulative draft of Unhydrated cement controls 58%��68%;
6), roller repairing technique: adopting after hot-rolled steel plate to concentrate and stack slow cooling, its matrix is tiny ferrite+pearlitic structure, and the complex inclusion form that in steel plate, inclusion combines formation small and dispersed with Y, Ce and O, Mg, Al, S exists.
It is an advantage of the current invention that by steel adds Yttrium base rare earth silicon calcium alloy, utilize Y, Ce in rare earth preferential with the oxygen in steel, sulphur etc. impurity element react after the complex rare-earth oxidate containing valuable metal of generation, rare earth complex sulfide and rare earth composite oxygen sulfide, form rare earth complex inclusion density based on yttrium than lanthanum, advantage that cerium mischmetal complex inclusion density is little, accelerate steel inclusion to float, reduce impurity in steel. And utilize Y, Ce effectively to control residual sulphur compound, oxide form further, eliminate MnS inclusion harm effect in steel, Yttrium base rare earth is made to play the effect of purification, sex change, microalloying and oxide compound metallurgy in steel, final stay in steel Y, Ce simple substance and small and dispersed based on Y, Ce be auxiliary complex inclusion, this kind of complex inclusion form and tiny ferrite+pearlitic structure, improve steel plate low-temperature impact toughness greatly.
Accompanying drawing explanation
Fig. 1 is that the present invention contains yttrium element steel EH36 deck of boat metallographic structure.
Fig. 2 is that the present invention contains yttrium element steel slab thickness 1/4 place inclusion and amplifies 100 times of lower shape looks.
Fig. 3 is that in Fig. 2, inclusion amplifies 5000 times of lower shape looks.
Fig. 4 is that the present invention contains yttrium element steel EH36 deck of boat thickness 1/2 place's transverse impact fracture inclusion shape looks.
Fig. 5 is that the present invention contains yttrium element steel EH36 deck of boat thickness 1/2 place's impact of collision fracture inclusion shape looks.
Fig. 6 is that the present invention contains yttrium element steel EH36 deck of boat thickness 1/4 place longitudinally-80 DEG C of impact fracture shape looks.
Fig. 7 is that the present invention contains yttrium element steel EH36 deck of boat thickness 1/4 place to-80 DEG C of impact fracture shape looks.
Fig. 8 is not containing rare earth steel EH36 deck of boat thickness 1/4 place longitudinally-80 DEG C of impact fractures shape looks (comparative example).
Fig. 9 does not contain rare earth steel EH36 deck of boat thickness 1/4 place to-80 DEG C of impact fracture forms (comparative example).
Embodiment:
Below in conjunction with drawings and Examples, the invention will be further described, and in embodiment, high tensile steel plate is prepared by the chemical composition designed by the present invention, manufacture method.
Technical scheme 1: a kind of high tensile steel plate improving low-temperature impact toughness of the present invention, adopt TMCP rolling, produce CCSEH36 high strength steel plate for ship building, its chemical composition is by the control of following mass percent: C:0.07%��0.13%, Si:0.15%��0.30%, Mn:1.15%��1.45%, P��0.025%, S��0.006%, Nb��0.04%, V��0.005%, Ti:0.008%��0.015%, Ni��0.10%, Cr��0.10%, Cu��0.10%, Mo��0.08%, Alt:0.015%��0.030%, N��0.015%, O:0.002%��0.003%, solid solution Y:0.005%��0.008% in steel, solid solution Ce:0.015%��0.023%, remaining inclusion in steel and combine the complex inclusion form existence forming small and dispersed with Y, Ce and O, Mg, Al, S, comprising Y, Ce mass percent in described complex inclusion component is: Y:25.72%��67.92%, Ce:3.09%��15.27%, described complex inclusion component also comprises CaS inclusion, its surplus is iron Fe and inevitable impurity, steel matrix is organized as tiny ferrite+pearlitic structure.
The manufacture method of the CCSEH36 deck of boat described in technical scheme 1, its processing step:
1), converter smelting: adopting top and bottom complex blowing oxygen coverter to smelt, deoxidation alloying in tapping process, Control for Oxygen Content is at 35��65ppm;
2), LF stove refining: after molten steel enters refining station, argon bottom-blowing, add lime simultaneously, refining slag and submerged arc slag, then be energized intensification, heat up after 9 minutes, survey temperature, sampling, carry out trimming, simultaneously according to the situation of top slag, add calcium carbide and aluminium grain makes white slag, the white slag hold-time is greater than 15 minutes, and then carry out surveying temperature, sampling, fine setting alloying constituent, treat liquid steel temperature, after composition is up to standard, feeding calcium line, after 2 minutes, again with the speed feeding Yttrium base rare earth silicon calcium alloy claded wire 300m��500m of 2��3m/s, line feeding carries out soft blow argon after terminating, soft argon blowing time 8��15 minutes, promote that inclusion fully floats and enter slag, obtain its mass percent of molten steel composition in following scope: C:0.07%��0.13%, Si:0.15%��0.30%, Mn:1.15%��1.45%, P��0.025%, S��0.006%, Nb��0.04%, V��0.005%, Ti:0.008%��0.015%, Ni��0.10%, Cr��0.10%, Cu��0.10%, Mo��0.08%, Alt:0.015%��0.030%, N��0.015%, O:0.002%��0.003%, solid solution Y:0.005%��0.008% in steel, solid solution Ce:0.015%��0.023%, remaining inclusion in steel and combine the complex inclusion form existence forming small and dispersed with Y, Ce and O, Mg, Al, S, comprising Y, Ce mass percent in described complex inclusion component is: Y:25.72%��67.92%, Ce:3.09%��15.27%, described complex inclusion component also comprises CaS inclusion, its surplus is iron Fe and inevitable impurity,
3), Lian Zhu: refining terminates, and molten steel is delivered to continuous casting workshop and carries out even casting slab, tundish temperature 1518 DEG C��1538 DEG C, and slab casting speed control adopts weak cold at 0.73��0.86m/min, secondary cooling water, air-water spraying cooling;
4), heating cycle: in process furnace, continuously cast bloom being heated to 1218��1234 DEG C, heating total time controls by 1.18��1.23 minutes/mm, soaking time >=190min;
5), rolling technology: adopt two-stage control rolling, start rolling temperature >=1062 DEG C of recrystallization zone rolling, rolling every time draft in recrystallization zone controls 28%��38%, intermediate blank treats temperature on roller-way, the start rolling temperature of Unhydrated cement rolling 845��875 DEG C, finishing temperature 815��835 DEG C, the accumulative draft of Unhydrated cement controls 58%��68%;
6), roller repairing technique: cool with the speed of cooling of 6.0��12 DEG C/S after hot-rolled steel plate, adopt to concentrate and stack slow cooling, its matrix is tiny ferrite+pearlitic structure, and in steel plate, inclusion combines the complex inclusion form existence forming small and dispersed with Y, Ce and O, Mg, Al, S.
Technical scheme 2: a kind of high tensile steel plate improving low-temperature impact toughness of the present invention, adopt controlled rolling+normalizing thermal treatment, produce P460NL2 high-strength pressure vessel plate, its chemical composition is by the control of following mass percent: C:0.15%��0.19%, Si:0.25%��0.45%, Mn:1.30%��1.65%, P��0.015%, S��0.005%, Nb��0.02%, V:0.14%��0.18%, Ti��0.008%, Ni:0.16%��0.39%, Cr��0.10%, Cu��0.10%, Mo��0.08%, N:0.006%��0.018%, Alt:0.005%��0.015%, O:0.002%��0.003%, solid solution Y:0.007%��0.010% in steel, solid solution Ce:0.018%��0.025%, remaining inclusion in steel and combine the complex inclusion form existence forming small and dispersed with Y, Ce and O, Mg, Al, S, comprising Y, Ce mass percent in described complex inclusion component is: Y:30.19%��69.15%, Ce:4.10%��17.52%, its surplus is iron Fe and inevitable impurity, steel matrix is organized as tiny ferrite+pearlitic structure.
The manufacture method of P460NL2 high-strength pressure vessel plate described in technical scheme 2, its processing step:
1), converter smelting: adopting top and bottom complex blowing oxygen coverter to smelt, deoxidation alloying in tapping process, Control for Oxygen Content is at 32��66ppm;
2), LF stove refining: after molten steel enters refining station, argon bottom-blowing, add lime simultaneously, refining slag and submerged arc slag, then be energized intensification, heat up after 8 minutes, survey temperature, sampling, carry out trimming, simultaneously according to the situation of top slag, add calcium carbide and aluminium grain makes white slag, the white slag hold-time is greater than 15 minutes, and then carry out surveying temperature, sampling, fine setting alloying constituent, treat liquid steel temperature, after composition is up to standard, feeding calcium line, after 1 minute, again with the speed feeding Yttrium base rare earth silicon calcium alloy claded wire 300m��500m of 2��3m/s, line feeding carries out soft blow argon after terminating, soft argon blowing time 8��15 minutes, promote that inclusion fully floats and enter slag, obtain its mass percent of molten steel composition in following scope: C:0.15%��0.19%, Si:0.25%��0.45%, Mn:1.30%��1.65%, P��0.015%, S��0.005%, Nb��0.02%, V:0.14%��0.18%, Ti��0.008%, Ni:0.16%��0.39%, Cr��0.10%, Cu��0.10%, Mo��0.08%, N:0.006%��0.018%, Alt:0.005%��0.015%, O:0.002%��0.003%, solid solution Y:0.007%��0.010% in steel, solid solution Ce:0.018%��0.025%, remaining inclusion in steel and combine the complex inclusion form existence forming small and dispersed with Y, Ce and O, Mg, Al, S, comprising Y, Ce mass percent in described complex inclusion component is: Y:30.19%��69.15%, Ce:4.10%��17.52%, its surplus is iron Fe and inevitable impurity,
3), Lian Zhu: refining terminates, and molten steel is delivered to continuous casting workshop and carries out even casting slab, tundish temperature 1516 DEG C��1536 DEG C, and slab casting speed control adopts weak cold at 0.75��0.85m/min, secondary cooling water, air-water spraying cooling;
4), heating cycle: in process furnace, continuously cast bloom being heated to 1216��1232 DEG C, heating total time controls by 1.16��1.22 minutes/mm, soaking time >=200min;
5), rolling technology:; Adopt two-stage control rolling, start rolling temperature >=1065 DEG C of recrystallization zone rolling, rolling every time draft in recrystallization zone controls 28%��38%, intermediate blank treats temperature on roller-way, the start rolling temperature of Unhydrated cement rolling 850��870 DEG C, finishing temperature 810��832 DEG C, the accumulative draft of Unhydrated cement controls 58%��68%;
6), roller repairing technique: cool with the speed of cooling of 7.0��15 DEG C/S after hot-rolled steel plate, adopt to concentrate and stack slow cooling, its matrix is tiny ferrite+pearlitic structure, and in steel plate, inclusion is mingled with form exists with the oxide compound of Y, Ce and O, Mg, Al, S combination formation small and dispersed, sulfide, oxysulfide compound.
The Yttrium base rare earth silicon calcium alloying constituent that the present invention drops at LF stove refining procedure is in table 1.
Table 1 Yttrium base rare earth silicon calcium alloy composition, wt%
Composition Re (Y/Re > 80%) Si Ca Fe
Content 25.15 39.39 1.42 28.14
The effect of Yttrium base rare earth silicon calcium alloy in steel, effect are fully open at patent No. ZL200510019201.7, repeat no more here.
In process of producing product described in technical scheme 1,2, at LF stove refining procedure, feeding Yttrium base rare earth silicon calcium alloy claded wire, first, in Yttrium base rare earth Y, Ce preferential with the oxygen in steel, sulphur etc. impurity element react after the complex rare-earth oxidate containing valuable metal of generation, rare earth complex sulfide and rare earth composite oxygen sulfide, forming the rare earth complex inclusion based on heavy rare earth yttrium, information disclosed in patent No. ZL200510019201.7, YOS complex inclusion density is about 4.25g/cm3, it is about 6.0g/cm than Ce (La) OS complex inclusion density3Much little, YOS complex inclusion ascent rate in steel doubles than Ce (La) OS complex inclusion ascent rate in steel, accelerates the middle inclusion floating of steel, effectively reduces impurity in steel, has purified molten steel. Secondly, in rare earth, Y, Ce effectively control residual sulphur compound, oxide form further, sex change is that class is spherical, size is less, original inclusion modification in steel is made to be that the rare-earth sulfide based on yttrium, rare-earth oxide sulfate and rare-earth oxidation thing compound that fusing point is higher are mingled with (see Fig. 2, Fig. 3), from Fig. 2, Fig. 3 it may be seen that steel the harm effect of MnS inclusion eliminate. Finally, by the effect of oxide compound metallurgy, Y, Ce and oxygen combine the fine oxide that can form a large amount of Dispersed precipitate and are mingled with and are distributed in steel, pinning effect is formed at austenite grain boundary, thus refinement crystalline structure, forming tiny ferrite+pearlitic structure (see Fig. 1), this kind of matrix improves steel plate low-temperature impact toughness greatly.
Being produced CCSEH36 high strength steel plate for ship building example strand according to technical scheme 1 to become to be respectively in table 2, corresponding slab thickness 1/4 place Yttrium base rare earth complex inclusion composition is in table 3, and Yttrium base rare earth strand complex inclusion shape looks are shown in Fig. 2, Fig. 3. J48-1, J48-2 in the corresponding table 3 of label 1,2 in Fig. 2, J48-3, J48-4 in the corresponding table 3 of label 3,4 in Fig. 3. Corresponding steel plate thickness 1/2 place laterally, longitudinally samples impact fracture Yttrium base rare earth complex inclusion composition in table 4, Yttrium base rare earth steel plate is horizontal, impact of collision fracture complex inclusion shape looks are shown in Fig. 4, Fig. 5, horizontal sample H-1/2-1, H-1/2-2 in the corresponding table 4 of label 1,2 in Fig. 4, longitudinal sample Z-1/2-1, Z-1/2-2 in the corresponding table 4 of label 1,2 in Fig. 5.
Table 2 Yttrium base rare earth process steel CCSEH36 strand composition, wt%
Stove number C Mn Si P S Cr Alt V Nb Cu N Ti Y Ce Remarks
J48 0.13 1.20 0.21 0.021 0.003 0.07 0.023 0.003 0.017 0.05 0.0065 0.011 0.006 0.023 Head 1
J48 0.11 1.24 0.23 0.019 0.003 0.07 0.023 0.004 0.021 0.04 0.007 0.011 0.006 0.023 Afterbody 1
J48 0.10 1.27 0.24 0.019 0.002 0.07 0.023 0.004 0.024 0.04 0.0072 0.011 0.006 0.023 Head 2
As can be seen from Table 2, Yttrium base rare earth process steel strand composition contains the Ce of the Y and 0.023% of 0.006%, plays microalloying effect, refinement matrix. By to Yttrium base rare earth strand complex inclusion composition detection, associative list 3, Fig. 2, Fig. 3, it can be seen that steel medium sulphide content, oxide compound, oxysulfide are mingled with and are caught by Yttrium base rare earth, form the Yttrium base rare earth complex inclusion form based on yttrium of small and dispersed.
Table 3 Yttrium base rare earth process steel CCSEH36 slab thickness 1/4 place Yttrium base rare earth complex inclusion composition
Check point Element O Mg Al Y Ce Ca S Fe Inclusion
J48-1 Wt% -- -- -- -- -- 57.59 42.41 -- Sulfurated lime
J48-2 Wt% 18.43 -- -- 66.71 13.77 1.09 -- -- Oxide compound
J48-3 Wt% 23.36 0.97 5.43 45.21 13.73 10.06 -- 1.24 Oxide compound
J48-4 Wt% 20.68 4.47 8.72 27.62 3.50 24.86 8.98 1.17 Oxysulfide
Table 4 Yttrium base rare earth process steel CCSEH36 steel plate transverse and longitudinal impact fracture Yttrium base rare earth complex inclusion composition
Check point Element O Mg Al Y Ce S Ca Fe
H-1/2-1 Wt% 10.60 1.41 -- 25.72 14.39 12.28 1.31 34.29
H-1/2-2 Wt% 8.51 -- -- 30.34 13.32 17.69 2.10 28.04
Z-1/2-1 Wt% 9.66 -- -- 33.30 11.08 8.63 -- 37.33
Z-1/2-2 Wt% 12.25 -- -- 29.33 9.68 12.59 2.48 33.67
Associative list 4, Fig. 4, Fig. 5, it can be seen that steel inclusion is the Yttrium base rare earth complex inclusion based on yttrium of small and dispersed.
Other cases: stove J51 Yttrium base rare earth process steel slab thickness 1/2 place or 1/4 place's Yttrium base rare earth complex inclusion composition are in table 5, and corresponding Yttrium base rare earth process steel steel plate transverse and longitudinal impact fracture Yttrium base rare earth complex inclusion composition is in table 6.
Table 5 Yttrium base rare earth process steel slab thickness 1/2 place or 1/4 place's Yttrium base rare earth complex inclusion composition
Check point Element O Mg Al Y Ce Ca S Fe Inclusion
J51-1/2-1 Wt% -- -- -- -- -- 42.58 57.42 -- Sulfurated lime
J51-1/2-2 Wt% 20.38 -- -- 69.15 10.47 -- -- -- Oxide compound
J51-1/4-1 Wt% 19.71 -- -- 65.68 13.55 1.06 -- -- Oxide compound
J51-1/4-2 Wt% 17.83 -- -- 62.18 14.38 1.51 2.43 1.67 Oxysulfide
Table 6 Yttrium base rare earth process steel steel plate transverse and longitudinal impact fracture Yttrium base rare earth complex inclusion composition
Check point Element O Mg Al Y Ce S Ca Fe
J55-H-1/4-1 Wt% 11.25 0.58 -- 48.74 4.10 7.40 2.26 25.67
J55-H-1/4-2 Wt% 17.16 -- -- 39.99 10.24 13.52 2.85 16.24
J55-Z-1/2-1 Wt% 17.46 -- -- 32.41 15.33 10.98 1.14 22.68
J55-Z-1/2-2 Wt% 10.52 -- -- 52.18 12.72 8.08 0.91 15.59
In order to verify the technology of the present invention effect, CCSEH36 high-strength ship plates is carried out interpolation Yttrium base rare earth and has not added Yttrium base rare earth simultaneous test, sample at steel plate thickness 1/4 place, impact property detected result is shown in Fig. 6, Fig. 7, Fig. 8, Fig. 9 in table 7 ,-80 DEG C of transverse directions, the contrasts of impact of collision fracture apperance.
Table 7 is containing Yttrium base rare earth and the impact property detected result not containing Yttrium base rare earth CCSEH36 steel plate
As can be seen from Table 7, not containing Yttrium base rare earth steel plate impact property along with impact temperature reduces, impact property fall is bigger, it becomes more and more poorer, especially transverse impact performance. And it is milder to impact degradation containing Yttrium base rare earth steel plate, amplitude is little, and longitudinal impact property remains on more than 177J, and transverse impact property retention is at more than 103J, and transverse and longitudinal difference diminishes, illustrate and add the low temperature impact properties that Yttrium base rare earth substantially improves steel plate. Can also find out from Fig. 6, Fig. 7, Fig. 8, Fig. 9 display-80 DEG C of transverse directions, the contrast of impact of collision fracture apperance, under-80 DEG C of cold condition, Fig. 6, Fig. 7 display has much tiny tough nest to exist containing Yttrium base rare earth steel impact fracture shape looks, the Yttrium base rare earth complex inclusion of small and dispersed is in tough nest, it is to increase shock resistance. And Fig. 8, Fig. 9 display is not containing the fracture of Yttrium base rare earth steel impact fracture divisibility, illustrate that transverse impact absorbs energy and arrived the limit in 22.9J steel plate shock resistance.
Being produced P460NL2 high-strength pressure vessel plate example strand according to technical scheme 2 to become to be respectively in table 8, in the sampling of steel plate thickness 1/4 place, contrast impact property detected result is in table 9.
Table 8 Yttrium base rare earth process steel P460NL2 strand composition, wt%
Stove number C Mn Si P S Cr Ni Cu Mo V Ti Alt Nb N Y Ce
J137 0.17 1.61 0.38 0.007 0.002 0.04 0.32 0.06 0.005 0.160 0.003 0.006 0.001 0.011 0.009 0.020
J138 0.18 1.65 0.34 0.006 0.002 0.05 0.31 0.05 0.004 0.162 0.002 0.007 0.002 0.010 0.010 0.025
J139 0.16 1.56 0.43 0.005 0.001 0.03 0.34 0.06 0.005 0.168 0.006 0.006 0.001 0.009 0.008 0.018
J140 0.19 1.38 0.40 0.005 0.003 0.03 0.33 0.05 0.005 0.146 0.002 0.008 0.001 0.008 0.007 0.022
Table 9 is containing Yttrium base rare earth and the impact property detected result not containing Yttrium base rare earth P460NL2 steel plate
As can be seen from Table 9, not containing Yttrium base rare earth steel plate impact property is also that impact property significantly declines, it becomes more and more poorer, especially transverse impact performance along with impact temperature reduces. And it is relatively milder to impact degradation containing Yttrium base rare earth steel plate, amplitude is little, and longitudinal impact property remains on more than 135J, and transverse impact property retention is at more than 107J, and same explanation adds the low temperature impact properties that Yttrium base rare earth substantially improves steel plate.
Final declaration: protection domain of the present invention is not limited thereto, is equal to according to the technical scheme of the present invention and invention design thereof and replaces or change, all should be encompassed within protection scope of the present invention.

Claims (3)

1. one kind is improved the high tensile steel plate of low-temperature impact toughness, its chemical composition by mass percent is: C:0.07% ~ 0.19%, Si:0.15% ~ 0.45%, Mn:1.15% ~ 1.65%, P��0.025%, S��0.008%, Nb��0.04%, V��0.20%, Ti��0.015%, Ni��0.40%, Cr��0.10%, Cu��0.10%, Mo��0.08%, Alt:0.005% ~ 0.030%, N��0.020%, O:0.002% ~ 0.003%, its surplus is iron Fe, rare earth and inevitable impurity, it is characterized in that, described rare earth is Yttrium base rare earth, solid solution Y:0.005% ~ 0.010% in steel, solid solution Ce:0.015% ~ 0.025%, remaining inclusion in steel and combine the complex inclusion form existence forming small and dispersed with Y, Ce and O, Mg, Al, S, comprising Y, Ce mass percent in described complex inclusion component is: Y:25.72% ~ 69.15%, Ce:3.09% ~ 17.52%, steel matrix is organized as tiny ferrite+pearlitic structure.
2. a kind of high tensile steel plate improving low-temperature impact toughness according to claim 1, it is characterised in that, described complex inclusion component also comprises CaS inclusion.
3. a manufacture method for the special high tensile steel plate in improving low-temperature impact toughness, its processing step:
1) converter smelting: adopting top and bottom complex blowing oxygen coverter to smelt, deoxidation alloying in tapping process, Control for Oxygen Content is at 32 ~ 68ppm;
2) LF stove refining: after molten steel enters refining station, argon bottom-blowing, add lime simultaneously, refining slag and submerged arc slag, then be energized intensification, heat up after 8 minutes, survey temperature, sampling, carry out trimming, simultaneously according to the situation of top slag, add calcium carbide and aluminium grain makes white slag, the white slag hold-time is greater than 15 minutes, and then carry out surveying temperature, sampling, fine setting alloying constituent, treat liquid steel temperature, after composition is up to standard, feeding calcium line, after 1��2 minute, again with the speed feeding Yttrium base rare earth silicon calcium alloy claded wire 300m��500m of 2��3m/s, line feeding carries out soft blow argon after terminating, soft argon blowing time 8��15 minutes, promote that inclusion fully floats and enter slag, obtain its mass percent of molten steel composition in following scope: C:0.07% ~ 0.19%, Si:0.15% ~ 0.45%, Mn:1.15% ~ 1.65%, P��0.025%, S��0.008%, Nb��0.04%, V��0.20%, Ti��0.015%, Ni��0.40%, Cr��0.10%, Cu��0.10%, Mo��0.08%, Alt:0.005% ~ 0.030%, N��0.020%, O:0.002% ~ 0.003%, solid solution Y:0.005% ~ 0.010% in steel, solid solution Ce:0.015% ~ 0.025%, remaining inclusion in steel and combine the complex inclusion form existence forming small and dispersed with Y, Ce and O, Mg, Al, S, comprising Y, Ce mass percent in described complex inclusion component is: Y:25.72% ~ 69.15%, Ce:3.09% ~ 17.52%, its surplus is iron Fe and inevitable impurity,
3) even casting: refining terminates, delivers to molten steel continuous casting workshop and carries out even casting slab, tundish temperature 1515 DEG C��1540 DEG C, and slab casting speed control adopts weak cold at 0.72 ~ 0.90m/min, secondary cooling water, air-water spraying cooling;
4) heating cycle: in process furnace, continuously cast bloom is heated to 1215 ~ 1236 DEG C, heating total time controls by 1.15 ~ 1.25 minutes/mm, soaking time >=185min;
5) rolling technology: adopt two-stage control rolling, start rolling temperature >=1060 DEG C of recrystallization zone rolling, rolling every time draft in recrystallization zone controls 28% ~ 38%, intermediate blank treats temperature on roller-way, the start rolling temperature of Unhydrated cement rolling 840��880 DEG C, finishing temperature 808��838 DEG C, the accumulative draft of Unhydrated cement controls 58% ~ 68%;
6) roller repairing technique: adopting after hot-rolled steel plate to concentrate and stack slow cooling, its matrix is tiny ferrite+pearlitic structure, and the complex inclusion form that in steel plate, inclusion combines formation small and dispersed with Y, Ce and O, Mg, Al, S exists.
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