CN103276312B - High-strength steel plate having extra thickness of 80-120mm and method for producing same from continuous casting billet - Google Patents
High-strength steel plate having extra thickness of 80-120mm and method for producing same from continuous casting billet Download PDFInfo
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Abstract
The invention belongs to the technical field of extra-thick quenched and tempered high-strength steel and a production method thereof, and particularly relates to a high-strength steel plate having an extra thickness of 80-120mm and a method for producing the same from a continuous casting billet. The steel plate comprises the following chemical components in percentage by weight: 0.15-0.19% of carbon (C), 0.20-0.40% of silicon (Si), 1.15-1.35% of manganese (Mn), no more than 0.015% of phosphorus (P), no more than 0.008% of sulfur (S), 0.15-0.30% of nickel (Ni), 0.40-0.60% of chromium (Cr), 0.20-0.35% of molybdenum (Mo), 0.015-0.030% of niobium (Nb), 0.015-0.030% of titanium (Ti), 0.020-0.045% of aluminum (Al), 0.0010-0.0030% of boron (B), no more than 0.56% of carbon equivalent (CEV) and the balance of iron and inevitable impurities. According to the scheme, the contents of noble alloy elements such as Cr, Ni, Mo and the like are reduced, thus reflecting low-cost economic design; and the steel plate having an extra thickness of 80-120mm is directly produced from a continuous casting billet, thus simplifying the technical process, fully taking advantages of the improvement effect on the core structure according to a high-temperature stage reduction schedule, mining the maximum potential of heat treatment, improving the hardenability by means of a technical means, and ensuring the uniform high-thickness cross section property.
Description
Technical field
The invention belongs to the technical field of special thick hardening high-strength steel and production method thereof, particularly relate to and utilize continuously cast bloom to produce 80-120mm economical 800MPa grade high-strength Plate Steel and manufacture method thereof in low compression ratio situation, the method being specially the special thickness high intensity steel plate of a kind of 80-120mm and utilizing continuously cast bloom to produce.
Background technology
Special heavy plate (thick more than 80mm) is usually used in midium-carbon steel, electric power steel, high-end die steel, steel heavy plate for pressure vessels, offshore platform steel, Steels for High Rise Buildings, is a kind of high value added product.The tensile strength of domestic and international life-time service mainly adopts the manufacture technics of high-alloying, traditional static ingot rolling, electroslag remelting steel ingot rolling, follow-up Q-tempering Tempering and Quenching at the high strength special heavy plate of 800MPa.Along with the increase of thickness, for increasing the hardening capacity of steel, must improve carbon content and Xiang Gangzhong adds the expensive alloying elements such as a large amount of Cr, Mo, Ni, Cu, Nb, V, especially Ni content will control more than 1.00%, Mo, Cr content generally will control more than 0.5%, and cost is high; And the long energy consumption of ingot steel casting operation is large, rolling lumber recovery is low, is generally no more than 75%; ESR ingot/directional freeze steel ingot Rolling Production efficiency is very low, and power consumption is large, and lumber recovery improves not obvious simultaneously.
The advantage of continuous casting steel billet is that internal soundness is good, energy consumption is low, and lumber recovery is high, but thickness of strand domestic is at present generally 250-300mm, due to by compression than restriction, the special thickness high intensity steel plate degree-of-difficulty factor of the super-thick steel plate producing more than 80mm especially 800MPa level increases.
Disclosed in State Intellectual Property Office, the application number of Wuyang Iron & Steel Co., Ltd.'s application is 200810141457.9, the patent of " a kind of large thickness quenched high strength steel and production method thereof " by name, the patent provides a kind of manufacture method of tensile strength 800MPa level quenched and tempered steel, its feature is that the slab ingot mould of employing 26.7 tons is produced, produce steel plate maximum ga(u)ge 114mm, and in steel, Ni, Cr, Mo precious alloy component content is high, causes the rising of carbon equivalent and cost.
Disclosed in State Intellectual Property Office, the application number of Wuyang Iron & Steel Co., Ltd.'s application is 201110135390.X, the patent of " a kind of heavy thickness offshore platform steel plate and production method thereof " by name, the patent provides the steel grade that a kind of 300mm is thick, adopt normalizing process to produce, be characterized in adopting esr mode to obtain large-scale ESR ingot to produce super-thick steel plate, the grade of steel tensile strength of producing is 500MPa, and intensity rank is low.
Disclosed in State Intellectual Property Office, the application number of Baoshan Iron & Steel Co., Ltd's application is 201210067794.4, the patent of " ocean platform special thick high strength superior low-temperature flexible steel plate and manufacture method thereof " by name, carbon during this patent adopts, Cu, Ni, Cr, Mo alloying and Nb, V, the composition design method of Ti microalloying, by LF+RH refining, die casting, cogging, stress-removal process, the operations such as surface treatment, the maximum ga(u)ge manufactured is 200mm steel plate, not only have employed static ingot raw material, and Ni in its composition, Cr content is high, high cost must be caused, difficult welding.
More than be the weak point existing for prior art, not yet occur the production method utilizing continuously cast bloom so far.
Summary of the invention
Object of the present invention is exactly for the deficiency existing for prior art, the technical scheme of the special thickness high intensity steel plate of a kind of 80-120mm and the method that utilizes continuously cast bloom to produce thereof is provided, the composition that the program adopts reduces the expensive alloying elements content such as Cr, Ni, Mo to embody the design of low cost economized, to adopt continuously cast bloom direct production 80-120mm super-thick steel plate to realize technical process simplification, give full play to improvement result, the excavation thermal treatment maximum capacity of hot stage reduction system to core structure, improve hardening capacity with process means, ensure that heavy thickness properties is even.The armor plate strength rank of producing reaches 800MPa, has the advantages that low-carbon-equivalent easily welds, with low cost, steady quality, technique are simple, be easy to industrialized mass.
This programme is achieved by the following technical measures:
The special thickness high intensity steel plate of a kind of 80-120mm, its chemical composition comprises following component by weight percentage: carbon (C) 0.15-0.19%, silicon (Si) 0.20-0.40%, manganese (Mn) 1.15-1.35%, phosphorus (P)≤0.015%, sulphur (S)≤0.008%, nickel (Ni) 0.15-0.30%, chromium (Cr) 0.40-0.60%, molybdenum (Mo) 0.20-0.35%, niobium (Nb) 0.015-0.030%, titanium (Ti) 0.015-0.030%, aluminium (Al) 0.020-0.045%, boron (B) 0.0010-0.0030%; Carbon equivalent (CEV)≤0.56%, surplus is iron and inevitable impurity.
As preferably, the special thickness high intensity steel plate of 80-120mm of the present invention, its chemical composition comprises following component by weight percentage: carbon (C) 0.17-0.19%, silicon (Si) 0.25-0.35%, manganese (Mn) 1.20-1.30%, phosphorus (P)≤0.015%, sulphur (S)≤0.008%, nickel (Ni) 0.15-0.20%, chromium (Cr) 0.40-0.50%, molybdenum (Mo) 0.25-0.30%, niobium (Nb) 0.020-0.025%, titanium (Ti) 0.020-0.025%, aluminium (Al) 0.030-0.040%, boron (B) 0.0020-0.0030%; Carbon equivalent (CEV)≤0.56%, surplus is iron and inevitable impurity.
As preferably, the special thickness high intensity steel plate of 80-120mm of the present invention, its chemical composition comprises following component by weight percentage: carbon (C) 0.18%, silicon (Si) 0.29%, manganese (Mn) 1.26%, phosphorus (P) 0.015%, sulphur (S) 0.002%, nickel (Ni) 0.16%, chromium (Cr) 0.42%, molybdenum (Mo) 0.27%, niobium (Nb) 0.023%, titanium (Ti) 0.023%, aluminium (Al) 0.035%, boron (B) 0.0028%; Carbon equivalent (CEV) 0.54%, surplus is iron and inevitable impurity.
The main alloy element that the present invention selects and the effect of quantity in steel thereof are:
Carbon (C): when carbon content is higher, because martensite point is lower, obtaining twin crystal martensite quantity after quenching increases, and causes the toughness of steel, plasticity to worsen, and hardening crack tendency also increases; On the other hand, the carbon content raising of steel can increase supersaturation carbon content in quenched martensite, and these supersaturation carbon will be separated out along some crystal face martensitic with carbide form in drawing process, causes the fragility of steel to increase, is difficult to the requirement meeting high tenacity.But carbon content is lower, be difficult to obtain high strength in steel, alternate manner must be taked to be made up.In addition, for improving intensity, consider that the strengthening effect of C to martensitic stucture is obviously better than alloying element, and the quenching and tempering, high of C content below 0.25% not only has high-strength toughness plasticity, also can directly weld under quality adjustment condition.Therefore, the best carbon content of the present invention's setting is 0.15 ~ 0.19%.
Silicon (Si): in the present invention, silicone content controls 0.20 ~ 0.40%, silicon mainly improves the intensity of steel with solution strengthening form, too high levels can cause the toughness of steel to decline.
Manganese (Mn): Mn is the effective element of deoxidation and desulfurization, can also improve hardening capacity and the intensity of steel, its to the enhancement of hardening capacity higher than Cr, Mo, Ni.The unfavorable one side of Mn is the superheated susceptivity increasing steel, and crystal grain is easily thick; During hardened steel high tempering, Mn and P has strong grain boundary cosegregation tendency, promotes temper brittleness, thus should control Mn content, is advisable with 1.15% ~ 1.35%.
Chromium (Cr): because Cr can be solid-solution in ferrite and austenite, can form multiple carbide again with the C in steel.When Cr is solid-solution in austenite, the hardening capacity of steel can be improved.When Cr and C forms complicated carbide, and in steel during disperse educt, dispersion-strengthened action can be played.Because Cr improves the effect of hardening capacity and solution strengthening, the intensity of steel under as-heat-treated condition and hardness can be improved, be thus widely used in modified structural low alloy steel.Also make plasticity decrease while but Cr plays strengthening effect in steel, and increase temper brittleness.Chromium and manganese element coordinate, and can obtain higher hardenability and full hardening deepness, improve the mechanical property of steel.Chromium is less than the segregation tendency of manganese, is conducive to the core segregation reducing steel, improves mechanical property uniformity with chromium for manganese.Therefore according to the requirement to strong plasticity, suitable Cr content can be determined.The best chromium content of the present invention's setting is 0.40 ~ 0.60%.
Molybdenum (Mo): due to Mo be solid-solution in ferrite and austenite time, the C curve of steel can be made to move to right, thus significantly improve the hardening capacity of steel, and Mo can significantly improve the recrystallization temperature of steel, improve temper resistance, compact grained sorbite can be obtained after modified, obdurability is improved.When forming the carbide of Mo, dispersion-strengthened action can be played.When Mo content is less, mainly based on solution strengthening, raising hardening capacity and temper resistance, increase with Mo content, obdurability is improved.The best molybdenum content of the present invention's setting is 0.20 ~ 0.35%.
Nickel (Ni): for ensureing hardening capacity and the toughness of Plate Steel, need to add Ni and increase stacking fault energy, the commutative Banach aglebra of screw dislocation under promotion low temperature, reduce stress concentration to improve the toughness of steel, but Ni content is unsuitable too high, otherwise increase the stability of supercooled austenite and reduce intensity, and adding cost, also embodying and do not occur for rolling technology in the effect improving toughness invention.Therefore its content controls 0.15% ~ 0.30%.
Niobium (Nb): adding of niobium is grain refining in order to promote Steel Rolling microstructure, under there is the condition of molybdenum, niobium can by suppressing austenite recrystallization refinement microstructure effectively in controlled rolling process, and make steel be strengthened by precipitation strength and raising hardening capacity.In steel boracic condition under, the common existence of niobium can improve hardening capacity.In welding process, the segregation of niobium, boron atom and separate out the alligatoring of austenite crystal when can hinder heating, and obtain more tiny heat affected zone tissue after ensureing welding.Its content controls 0.015 ~ 0.030%.
Titanium (Ti): titanium can form carbon, the nitride particles of tiny titanium, reheats in process by stoping the alligatoring of austenite crystal thus obtaining comparatively tiny austenitic microstructure at slab.In addition, the existence of the nitride particles of titanium can suppress the grain coarsening of welded heat affecting zone.Thus, titanium can improve the low-temperature flexibility of matrix metal and welded heat affecting zone simultaneously.It can stop nomadic nitrogen owing to defining the nitride of boron and the disadvantageous effect produced the hardening capacity of steel, and its add-on is comparatively suitable to be no more than 0.030%.
Aluminium (Al): aluminium is deoxidant element, can be used as AlN forming element, effectively crystal grain thinning, and when it is containing quantity not sufficient 0.01%, effect is less; During more than 0.07%, desoxydatoin reaches capacity; Highly more then mother metal and welding heat influence area toughness to be harmful to.Improve the hardening capacity of steel owing to adding economic B in steel, before adding B molten steel must fully deoxidation, determine nitrogen, therefore must have enough Al in composition, not oxidized to ensure titanium in steel, boron, obtain effective acid-soluble boron.Determine that its content controls 0.020 ~ 0.045%.
Boron (B): trace B can make the hardening capacity of steel significantly improve.Boron contents is too high, can promote brittle particle Fe
23(C, B)
6the formation of (a kind of boron-carbide of iron) or FeB.The substitute that boron can be used as expensive alloy element promotes along the microstructure uniformity on whole steel plate thickness direction.Boron also can increase the raising effect of molybdenum to steel hardenability, thus the steel of low-carbon-equivalent can be made to obtain high intensity adding of boron.Similarly, add boron in steel and provide the potential advantage high strength of steel combined with good weldability and anti-cold short ability.Boron also can improve grain-boundary strength and then improve the ability that opposing hydrogen causes transgranular fracture.But must ensure that rational Al, Ti, B content designs, add titanium by adjusting aluminium and make the abundant deoxidation of molten steel, determine nitrogen, ensure effective boron content.In the present invention, the OK range of boron is 0.0010-0.0030%.
The method that the special thickness high intensity steel plate of this programme 80-120mm utilizes continuously cast bloom to produce, step is as follows:
1) after adopting Desulphurization of Pig Iron, converter top bottom blowing, vacuum-treat, the chemical composition of steel is made to meet carbon (C) 0.15-0.19%, silicon (Si) 0.20-0.40%, manganese (Mn) 1.15-1.35%, phosphorus (P)≤0.015%, sulphur (S)≤0.008%, nickel (Ni) 0.15-0.30%, chromium (Cr) 0.40-0.60%, molybdenum (Mo) 0.20-0.35%, niobium (Nb) 0.015-0.030%, titanium (Ti) 0.015-0.030%, aluminium (Al) 0.020-0.045%, boron (B) 0.0010-0.0030%; Carbon equivalent (CEV)≤0.56%; Pouring molten steel after adopting whole process protection pouring technology to be processed by calcium (Ca) becomes slab;
2) to continuously cast bloom stacking slow cooling 48-72 hour, high temperature re-crystallization district controlled rolling process is adopted to roll into steel plate; Wherein hot stage controls total reduction≤15% of broadening rolling, and limiting the front slab thickness of size rolling with the ratio rolling rear steel plate thickness is more than 2, and the percentage pass reduction of last two passages controls >=15%, finishing temperature 920-950 DEG C;
3) steel plate rolls rear employing stacking waste heat retarded cooling process, and steel plate is with the temperature quick collection stacking of 600-750 DEG C, and stacking time controling is at 48-72 hour;
4) steel plate quenching Heating temperature 900-920 DEG C, soaking time 1.5-2min/mm, after coming out of the stove, shrend is to room temperature, tempering Heating temperature 560-600 DEG C, soaking time 2.5-3min/mm.
In described step 1), slab thickness is 250-300mm.
Described step 2) light plate thickness is 80-120mm, the total passage of size rolling controls in 5-7 passage.Steel plate after having aligned in described step 3) cools without cold bed.
In described step 4), quenching press roller speed adjusts according to 2-3m/min.
According to mentioned component and method manufacture, the yield strength Rp of the special thickness high intensity steel plate of 80-120mm of acquisition
0.2be greater than 700MPa, tensile strength Rm is greater than 800MPa, and unit elongation A is greater than 14 % ,-20 DEG C of shock absorption energy KV
2: 70-160J, carbon equivalent (CEV)≤0.56%, achieves the breakthrough utilizing continuously cast bloom low compression ratio to produce easily welding super-thick steel plate, and this technology can extend to the production that the limited enterprise of other intensity rank, continuously cast bloom carries out super-thick steel plate.
Special thickness high intensity steel plate of the present invention can be applied to various coal mine machinery, engineering machinery, harbour machinery, building machinery, gas blower, large span heavy duty bridge and other require the structure unit of good welds.
The method that the special thickness high intensity steel plate of this programme 80-120mm utilizes continuously cast bloom to produce, concrete steps are as follows:
1) after adopting Desulphurization of Pig Iron, converter top bottom blowing, vacuum-treat, the chemical composition of steel is made to meet carbon (C) 0.15-0.19%, silicon (Si) 0.20-0.40%, manganese (Mn) 1.15-1.35%, phosphorus (P)≤0.015%, sulphur (S)≤0.008%, nickel (Ni) 0.15-0.30%, chromium (Cr) 0.40-0.60%, molybdenum (Mo) 0.20-0.35%, niobium (Nb) 0.015-0.030%, titanium (Ti) 0.015-0.030%, aluminium (Al) 0.020-0.045%, boron (B) 0.0010-0.0030%; Carbon equivalent (CEV)≤0.56%; Pouring molten steel after adopting whole process protection pouring technology to be processed by calcium (Ca) becomes slab; Slab thickness is 250-300mm;
2) to continuously cast bloom stacking slow cooling 48-72 hour, allow the harmful element hydrogen in steel be spread, prevent hydrogen induced cracking; The fine-pored impact of part is finally solidified in minimizing central segregation of slab and central zone, slab thickness direction.Adopt high temperature re-crystallization district controlled rolling process to roll into steel plate, wherein hot stage controls total reduction≤15% of broadening rolling, and limiting the front slab thickness of size rolling with the ratio rolling rear steel plate thickness is more than 2, and the total passage of size rolling controls in 5-7 passage; The percentage pass reduction of last two passages controls >=15%, finishing temperature 920-950 DEG C; Steel plate thickness is 80-120mm;
3) steel plate roll after steel plate after having aligned cool without cold bed, but adopt the stacking waste heat retarded cooling process that rolls off the production line fast, steel plate is with the temperature quick collection stacking of 600-750 DEG C, and stacking time controling is at 48-72 hour; Allow the harmful element hydrogen in steel be spread, prevent hydrogen induced cracking, uniform formation and stress;
4) steel plate quenching Heating temperature 900-920 DEG C, soaking time 1.5-2min/mm, after coming out of the stove, shrend is to room temperature, and quenching press roller speed adjusts according to 2-3m/min, tempering Heating temperature 560-600 DEG C, soaking time 2.5-3min/mm.
The beneficial effect of this programme is: with low cost, technique is simple, and each processing parameter strong adaptability, has following beneficial effect:
1) utilize the special thickness high intensity steel plate of continuously cast bloom direct production 80-120mm, and intensity rank reaches 800MPa, obviously simplifies operation, the delivery cycle shortens to delivery in current average 30 days for average 65 days by die casting, realizes the manufacture of short route economized.
2) processing route controls uniqueness, give full play to the large pressure of hot stage to core structure pressing effect, particularly to broadening, the appropriate design of the rolling procedure of size rolling sequence, at hot stage by controlling the total reduction in broadening stage, limit the front slab thickness of size rolling and the ratio rolling rear steel plate thickness, increase the reduction in pass of last a few passage with seam heart defect, then modified mode is taked, give full play to build up, the effect of phase transformation strengthening, obtain suitable heterogeneous structure, , this technology has adaptability widely, may extend to the manufacture of other heavy thickness product.
3) economic Composition Design, Plate Welding are good: adopt multicomponent microalloying component system, to improve the hardening capacity of steel plate and temper resistance for main principle, give full play to the potentiality of the economical element such as C, B, significantly reduce Cr-Ni-Mo precious alloy addition, thus carbon equivalent and cost significantly reduce, and therefore composition design method is obviously different from the Composition Design of other patent.
4) strong, the thickness specification wide ranges of Technological adaptability.
In a word, the composition that the program adopts reduces the expensive alloying elements content such as Cr, Ni, Mo to embody the design of low cost economized, to adopt continuously cast bloom direct production 80-120mm super-thick steel plate to realize technical process simplification, give full play to improvement result, the excavation thermal treatment maximum capacity of hot stage reduction system to core structure, improve hardening capacity with process means, ensure that heavy thickness properties is even.The armor plate strength rank of producing reaches 800MPa, has the advantages that low-carbon-equivalent easily welds, with low cost, steady quality, technique are simple, be easy to industrialized mass.The armor plate strength obtained is high, moulds, good toughness, and the tensile strength of steel reaches more than 800MPa level, and-20 DEG C of low-temperature impact toughness reach more than 70J.As can be seen here, compared with prior art, have outstanding substantive distinguishing features and significant progress, its beneficial effect implemented also is apparent in the present invention.
Accompanying drawing explanation
Fig. 1 is the nearly hard surfacing organization chart of steel plate of the present invention.
Fig. 2 is steel plate 1/4th place quenching structure figure of the present invention.
Fig. 3 is steel plate heart portion quenching structure figure of the present invention.
Embodiment
Below by example, the present invention is described in further detail.
Embodiment 1:
The chemical composition of steel plate is:
C：0.15%，Si：0.21%，Mn：1.32%，P：0.014%，S：0.008%， Ni：0.16%，Cr：0.40%， Mo：0.22%，Nb：0.017%， Ti：0.016%， Al：0.025%， B：0.0015%； CEV：0.50%。All the other are Fe and inevitable impurity.
The production method of steel plate is as follows:
1) the qualified molten steel of as above composition is obtained after employing molten iron pre-desulfurization technology, converter top bottom blowing, LF+RH vacuum-treat.Adopt whole process protection pouring technology that the pouring molten steel after Ca process is become slab; Slab thickness is 250mm.
2) to roll off the production line stacking slow cooling 48 hours to continuously cast bloom according to easily cracking steel grade treatment process, reduce the segregation degree of strand heart portion element, even strand internal stress reduces steel billet and occurs heart portion tiny crack; Slab reheating temperature 1246 DEG C; Rethermalization time 4 hours; Broadening rolling 2 passage in austenite recrystallization district, every time deflection 7.7%, 6.7%; Before size rolling, slab thickness is 215mm, and rolling rear steel plate thickness is 80mm, and under size rolling sequence stagnation pressure, passage is 6 passages; Last two percentage pass reductions are controlled as 15.4%, 17.1%, finishing temperature 920 DEG C.
3) steel plate roll rear fast through thermal straightening machine straightening steel plate end to end after, utilize waste heat slow cooling without the cold bed cooling fast stacking that directly rolls off the production line, steel plate stacking temperature controls at 620 DEG C, 48 hours stacking time.
4) steel plate reheats temperature 900 DEG C, soaking time 160min, and after shrend of coming out of the stove, temperature is 54 DEG C, and quenching press roller velocity modulation is 3m/min.Tempering Heating temperature 600 DEG C, soaking time 240min.
The steel plate mechanical property produced:
Specification: 80mm; Yield strength (MPa): 789; Tensile strength (MPa): 860; Elongation after fracture (%): 17; 143,129,156J V-type impact of collision merit (-20 DEG C):.
Embodiment 2:
The chemical composition of steel plate is:
C：0.18%，Si：0.37%，Mn：1.16%，P：0.009%，S：0.004%， Ni：0.26%，Cr：0.55%， Mo：0.31%，Nb：0.027%， Ti：0.026%， Al：0.038%， B：0.0025%； CEV：0.56%。All the other are Fe and inevitable impurity.
The production method of steel plate is as follows:
1) the qualified molten steel of as above composition is obtained after employing molten iron pre-desulfurization technology, converter top bottom blowing, LF+RH vacuum-treat.Adopt whole process protection pouring technology that the pouring molten steel after Ca process is become slab; Slab thickness is 300mm.
2) to roll off the production line stacking slow cooling 72 hours to continuously cast bloom according to easily cracking steel grade treatment process, reduce the segregation degree of strand heart portion element, even strand internal stress reduces steel billet and occurs heart portion tiny crack; Slab reheating temperature 1250 DEG C; Rethermalization time 4.5 hours; Broadening rolling 2 passage in austenite recrystallization district, every time deflection 7.5%, 7.2%; Before size rolling, slab thickness is 257.5mm, and rolling rear steel plate thickness is 120mm, and under size rolling sequence stagnation pressure, passage is 5 passages; Last two percentage pass reductions are controlled as 15.7%, 15.4%, finishing temperature 950 DEG C.
3) steel plate roll rear fast through thermal straightening machine straightening steel plate end to end after, utilize waste heat slow cooling, steel plate stacking temperature 712 DEG C, 72 hours stacking time without the cold bed cooling fast stacking that directly rolls off the production line.
4) steel plate reheats temperature 920 DEG C, soaking time 200min, and after shrend of coming out of the stove, temperature is 75 DEG C, and quenching press roller velocity modulation is 2m/min.Tempering Heating temperature 560 DEG C, soaking time 300min.
The steel plate mechanical property produced:
Specification: 120mm; Yield strength (MPa): 737; Tensile strength (MPa): 825; Elongation after fracture (%): 19; 84,92,115J V-type impact of collision merit (-20 DEG C):.
Embodiment 3:
The chemical composition of steel plate is:
C：0.16%，Si：0.31%，Mn：1.22%，P：0.012%，S：0.005%， Ni：0.21%，Cr：0.49%， Mo：0.27%，Nb：0.020%， Ti：0.019%， Al：0.033%， B：0.0021%； CEV：0.53 %。All the other are Fe and inevitable impurity.
The production method of steel plate is as follows:
1) the qualified molten steel of as above composition is obtained after employing molten iron pre-desulfurization technology, converter top bottom blowing, LF+RH vacuum-treat.Adopt whole process protection pouring technology that the pouring molten steel after Ca process is become slab; Slab thickness is 270mm.
2) to roll off the production line stacking slow cooling 60 hours to continuously cast bloom according to easily cracking steel grade treatment process, reduce the segregation degree of strand heart portion element, even strand internal stress reduces steel billet and occurs heart portion tiny crack; Slab reheating temperature 1250 DEG C; Rethermalization time 4.5 hours; Broadening rolling 2 passage in austenite recrystallization district, every time deflection 7.1%, 7.2%; Before size rolling, slab thickness is 232.77mm, and rolling rear steel plate thickness is 100mm, and under size rolling sequence stagnation pressure, passage is 6 passages; Last two percentage pass reductions are controlled as 15.7%, 16.7%, finishing temperature 930 DEG C.
3) steel plate roll rear fast through thermal straightening machine straightening steel plate end to end after, utilize waste heat slow cooling, steel plate stacking temperature 680 DEG C, 60 hours stacking time without the cold bed cooling fast stacking that directly rolls off the production line.
4) steel plate reheats temperature 910 DEG C, soaking time 180min, and after shrend of coming out of the stove, temperature is 65 DEG C, and quenching press roller velocity modulation is 2.5m/min.Tempering Heating temperature 580 DEG C, soaking time 260min.
The steel plate mechanical property produced:
Specification: 100mm; Yield strength (MPa): 752; Tensile strength (MPa): 845; Elongation after fracture (%): 18.5; 126,96,132J V-type impact of collision merit (-20 DEG C):.
Claims (7)
1. the special thickness high intensity steel plate of 80-120mm, its chemical composition comprises following component by weight percentage: carbon (C) 0.15-0.19%, silicon (Si) 0.20-0.40%, manganese (Mn) 1.15-1.35%, phosphorus (P)≤0.015%, sulphur (S)≤0.008%, nickel (Ni) 0.15-0.30%, chromium (Cr) 0.40-0.60%, molybdenum (Mo) 0.20-0.35%, niobium (Nb) 0.015-0.030%, titanium (Ti) 0.015-0.030%, aluminium (Al) 0.020-0.045%, boron (B) 0.0010-0.0030%; Carbon equivalent (CEV)≤0.56%, surplus is iron and inevitable impurity; Preparation process is as follows:
1) after adopting Desulphurization of Pig Iron, converter top bottom blowing, vacuum-treat, make the chemical composition of steel meet said components ratio, the pouring molten steel after adopting whole process protection pouring technology to be processed by calcium (Ca) becomes slab;
2) to continuously cast bloom stacking slow cooling 48-72 hour, high temperature re-crystallization district controlled rolling process is adopted to roll into steel plate; Wherein hot stage controls total reduction≤15% of broadening rolling, and limiting the front slab thickness of size rolling with the ratio rolling rear steel plate thickness is more than 2, and the percentage pass reduction of last two passages controls >=15%, finishing temperature 920-950 DEG C;
3) steel plate rolls rear employing stacking waste heat retarded cooling process, and steel plate is with the temperature quick collection stacking of 600-750 DEG C, and stacking time controling is at 48-72 hour;
4) steel plate quenching Heating temperature 900-920 DEG C, soaking time 1.5-2min/mm, after coming out of the stove, shrend is to room temperature, tempering Heating temperature 560-600 DEG C, soaking time 2.5-3min/mm.
2. the special thickness high intensity steel plate of 80-120mm as claimed in claim 1, it is characterized in that, its chemical composition comprises following component by weight percentage: carbon (C) 0.17-0.19%, silicon (Si) 0.25-0.35%, manganese (Mn) 1.20-1.30%, phosphorus (P)≤0.015%, sulphur (S)≤0.008%, nickel (Ni) 0.15-0.20%, chromium (Cr) 0.40-0.50%, molybdenum (Mo) 0.25-0.30%, niobium (Nb) 0.020-0.025%, titanium (Ti) 0.020-0.025%, aluminium (Al) 0.030-0.040%, boron (B) 0.0020-0.0030%; Carbon equivalent (CEV)≤0.56%, surplus is iron and inevitable impurity.
3. the special thickness high intensity steel plate of 80-120mm as claimed in claim 1, it is characterized in that, its chemical composition comprises following component by weight percentage: carbon (C) 0.18%, silicon (Si) 0.29%, manganese (Mn) 1.26%, phosphorus (P) 0.015%, sulphur (S) 0.002%, nickel (Ni) 0.16%, chromium (Cr) 0.42%, molybdenum (Mo) 0.27%, niobium (Nb) 0.023%, titanium (Ti) 0.023%, aluminium (Al) 0.035%, boron (B) 0.0028%; Carbon equivalent (CEV) 0.54%, surplus is iron and inevitable impurity.
4. the special thickness high intensity steel plate of the 80-120mm according to the arbitrary claim of claim 1-3, it is characterized in that, in described step 1), slab thickness is 250-300mm.
5. the special thickness high intensity steel plate of 80-120mm according to the arbitrary claim of claim 1-3, is characterized in that, described step 2) light plate thickness is 80-120mm, the total passage of size rolling controls in 5-7 passage.
6. the special thickness high intensity steel plate of the 80-120mm according to the arbitrary claim of claim 1-3, is characterized in that, in described step 4), quenching press roller speed adjusts according to 2-3m/min.
7. the special thickness high intensity steel plate of the 80-120mm according to the arbitrary claim of claim 1-3, is characterized in that, the yield strength Rp of the steel plate obtained
0.2be greater than 700MPa, tensile strength Rm is greater than 800MPa, and unit elongation A is greater than 14 % ,-20 DEG C of shock absorption energy KV
2: 70-160J, carbon equivalent (CEV)≤0.56%.
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| CN103556077B (en) * | 2013-11-12 | 2015-06-10 | 湖南华菱湘潭钢铁有限公司 | Production method of quenched and tempered high-strength Q690D super-thick steel plate |
| CN103556075B (en) * | 2013-11-12 | 2015-06-10 | 湖南华菱湘潭钢铁有限公司 | Production method of quenched and tempered high-strength Q500D super-thick steel plate |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226255A (en) * | 2011-06-08 | 2011-10-26 | 江苏省沙钢钢铁研究院有限公司 | Steel plate with high strength and toughness and 690MPa of yield strength and preparation process thereof |
| CN103045964A (en) * | 2013-01-05 | 2013-04-17 | 莱芜钢铁集团有限公司 | Steel plate and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226255A (en) * | 2011-06-08 | 2011-10-26 | 江苏省沙钢钢铁研究院有限公司 | Steel plate with high strength and toughness and 690MPa of yield strength and preparation process thereof |
| CN103045964A (en) * | 2013-01-05 | 2013-04-17 | 莱芜钢铁集团有限公司 | Steel plate and manufacturing method thereof |
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