CN104988435A - 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 and manufacture field, be specifically related to the special thick tank plate of low carbon and high ductility that a kind of thickness is 100 ~ 110mm and manufacture method thereof.
Background technology
Along with the fast development of the industries such as China's oil chemical industry, Coal Chemical Industry, the Design and manufacture of pressurized vessel is just towards heavy thickness, high-parameters future development, this has higher requirement to the security of pressurized vessel, proposes harsher requirement for the performance and specification manufacturing steel heavy plate for pressure vessels.Wherein 1Cr0.5Mo is as middle high temperature pressure vessel steel, to be equivalent in GB713-2014 trade mark SA387Gr12CL2 in trade mark 15CrMoR and ASME SA387-2013, by means of its good mechanical behavior under high temperature, high temperature oxidation resistance, corrosion resistance, processing performance and weldability, be widely used in manufacturing the large-scale hydrogen-contacting equipment that the working conditionss such as oil, chemical industry, coal conversion, nuclear power are harsh, corrosive medium is complicated.But this steel grade 100mm is poor with the low-temperature flexibility of upper steel plate, usually the low temperature impact properties higher than-10 DEG C can only be ensured, have a strong impact on the use of this steel on extremely frigid zones hydrogen-contacting equipment, therefore how to be designed and preparation method by reasonable component, produce 1Cr0.5Mo ten points of necessity of satisfied less than-10 DEG C low temperature impact properties requirements.
Summary of the invention
Technical problem to be solved by this invention provides a kind of thickness to be the low-carbon (LC) tank plate of 100 ~ 110mm for above-mentioned prior art, for the manufacture of hydrogenator, vapourizing furnace, shift converter etc., there is extremely low carbon content,-38 DEG C of higher low-temperature impact toughness, Z-direction performance, especially have good anti-temper embrittlement ability and meet the not obvious requirement weakened of low-temperature impact toughness of Simulated post-weld heat treatment.
Another technical problem to be solved by this invention provides a kind of manufacture method manufacturing above-mentioned thick tank plate for above-mentioned prior art present situation.
The present invention solves the problems of the technologies described above adopted technical scheme, a kind of low carbon and high ductility super-thick steel plate, the chemical composition of this steel plate is the chemical composition of this steel plate is by mass percentage C:0.08 ~ 0.12% by mass percentage, 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%, surplus is Fe and inevitable impurity element.The thickness of this steel plate reaches 100 ~ 110mm.
Further, low carbon and high ductility super-thick steel plate of the present invention, the horizontal Charpy-V impact power >=120J in its-38 DEG C, heart portion, Z-direction performance >=50%.
The chemical composition of low carbon and high ductility super-thick steel plate of the present invention is determined like this:
In steel plate composition, C can increase hardening capacity and significantly improve intensity and the hardness of steel plate, but has disadvantageous effect to plasticity and toughness, and in order to ensure-38 DEG C of low temperature impact properties, C content controls at 0.08-0.12%; Si uses mainly as reductive agent during steel-making and reductor, has certain solution strengthening effect, but as the low-temperature flexibility of steel caused to reduce more than 0.80%, so Si controls about 0.30%; Mn improves the intensity of steel by solution strengthening, also favourable to toughness; Ni can improve toughness and the plasticity of steel, and also gain in strength, Ni of the present invention controls below 0.20% simultaneously; The hardening capacity that Cr can significantly improve, improves intensity and the hardness of steel, but reduces toughness and the plasticity of steel simultaneously, improve temper resistance; Mo is present in sosoloid and carbide, can improve hardening capacity and intensity, improves temper resistance; Sb, Sn, As are harmful elements, easily at grain boundary segregation, reduce the anti-temper embrittlement performance of steel, should reduce as far as possible; Nb forms Nb (N, C) precipitated phase and improves recrystallization temperature, and fining austenite grains, effectively can improve intensity and the toughness of steel; P, S are harmful elements, and P increases the fragility of steel, reduce the welding property of steel, reduce plasticity and cold-forming property, and S reduces ductility and the toughness of steel, causes crackle, therefore reduce P, S content as far as possible in hot procedure; H increases the hydrogen embrittlement tendency of steel, should reduce its content as far as possible.
The technical scheme that the present invention solves another technical problem is to provide a kind of manufacture method of above-mentioned low carbon and high ductility super-thick steel plate, and converter smelting continuous casting, heating rolling, heat treatment step are specific as follows:
(1) smelt continuous casting: raw materials for metallurgy successively through KR hot metal pretreatment, converter smelting: converter tapping P≤0.008%, converter tapping temperature is 1610 ~ 1650 DEG C, takes off Slag treatment; LF refining: the white slag hold-time is not less than 25min, total refining time is not less than 45min, skims during molten steel S≤0.003%; RH vacuum deaeration refining: vacuum tightness≤0.5mbar, the vacuum hold-time is broken empty when more than 25min; Continuous casting: produce and meet the continuously cast bloom that chemical composition requires, thickness is 370mm or more, to continuously cast bloom covering slow cooling more than 72 hours, covering is the H content in order to reduce steel billet further, slow cooling terminates to clear up continuously cast bloom surface band temperature afterwards, guarantee that continuously cast bloom surface flawless etc. affects the defect existence of plate surface quality, cleaning temperature remains on more than 100 DEG C.
(2) heating rolling: continuously cast bloom heating zone temperature is 1200 ~ 1260 DEG C, start rolling temperature is 1020 ~ 1100 DEG C, the single pass draught 40mm ~ 65mm of front 3 to 5 passages, and the overall compression ratio of rolling is >=3, finishing temperature 800 ~ 900 DEG C; After rolling completes, steel plate rolls off the production line when surface temperature 400 ~ 500 DEG C, the slow cooling of covering heap, slow cooling more than 72 hours, and slow cooling is to room temperature, and the object that steel plate rolls rear slow cooling fully reduces H content residual in steel plate, reduces the harm of H.
(3) heat treatment step: Quench and temper thermal treatment is carried out to steel plate, quenching temperature is 910 ~ 940 DEG C, and Quenching Soaking Time is 1.8 ~ 2.5min/mm, is quickly cooled to less than 200 DEG C after coming out of the stove with water; Tempering Heating temperature is 710 ~ 750 DEG C, and tempering insulation time is 2.5 ~ 4.0min/mm, cools in atmosphere after coming out of the stove, and obtains steel plate finished product.
Compared with prior art, the present invention has following features:
The present invention is the super-thick steel plate in order to obtain low carbon and high ductility, makes it to be suitable for making pressurized vessel as hydrogenator, shift converter etc.Steel plate carbon content (0.08-0.12%) is lower than the carbon content of existing steel plate (0.12-0.18%), drastically increase low-temperature flexibility and welding property, very high ballistic work can not only be still kept at-38 DEG C, also meet the requirement of steel plate room temperature and high temperature tensile strength simultaneously, through inspection, steel plate does not obviously decline in low-temperature flexibility and intensity after maximum analog postwelding and minimum Simulated post-weld heat treatment, meets the requirement of facing hydrogen steel completely.
To achieve these goals, the present invention adopts the chemical composition of optimization, reduce harmful element content as far as possible, control P≤0.005%, S≤0.003%, As≤0.012%, Sb≤0.003%, Sn≤0.010%, guarantees that above element macrosegregation does not occur and causes grain-boundary strength to decline and reduce low-temperature flexibility and intensity in continuous casting, rolling or heat treatment process.
In the smelting stage, by LF refining and RH vacuum outgas, make hydrogen richness drop to below 1ppm, guarantee that steel plate has higher resistance against hydrogen cracking ability, reduce hydrogen embrittlement to the impact of steel plate low-temperature flexibility as far as possible.The continuously cast bloom internal soundness that converter smelting is produced is curbed as the defect such as center segregation, center porosity, contributes to steel plate and obtains excellent heart portion performance.
The thermal treatment of steel plate of the present invention adopts the technique of quenching+tempering, obtain evenly without the even bainite structure be mingled with after quenching, then make steel can obtain uniform bainite tempered structure and tiny carbide in full thickness direction by rational temper, thus guarantee the heart portion low-temperature impact toughness of steel plate, room temperature tensile and Z-direction excellent property.
The low carbon and high ductility steel plate thickness of manufacture of the present invention can reach 100 ~ 110mm, heart portion excellent performance, especially-38 DEG C of more than cold impact value 120J, Z-direction excellent property, exceed the peak demand of standard to steel plate Z-direction performance 35%, show that the compactness of these steel is very high, meet the rigors to heavy thickness steel heart portion performance; Steel plate, after Simulated post-weld heat treatment, is organized and is still kept even, and the stretching of heart portion and heart portion impact property, without obvious fluctuation, still meet steel performance requirement.In addition, corresponding preparation method has cost advantage low, with short production cycle, easy to utilize.
Embodiment
Below in conjunction with embodiment, 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%, surplus is Fe and inevitable impurity element.
The manufacturing process of this steel plate is, by above-mentioned steel plate finished product chemical composition configuration raw materials for metallurgy, (1) smelt continuous casting: raw materials for metallurgy successively through KR hot metal pretreatment, converter smelting: converter tapping P≤0.008%, converter tapping temperature is 1610 ~ 1650 DEG C, takes off Slag treatment; LF refining: the white slag hold-time is not less than 25min, total refining time is not less than 45min, skims during molten steel S≤0.003%; RH vacuum deaeration refining: vacuum tightness≤0.5mbar, the vacuum hold-time is broken empty when more than 25min; Continuous casting: produce and meet that chemical composition requires, thickness is the continuously cast bloom of 370mm, to continuously cast bloom covering slow cooling more than 72 hours, covering is the H content in order to reduce steel billet further, slow cooling terminates to clear up continuously cast bloom surface band temperature afterwards, guarantee that continuously cast bloom surface flawless etc. affects the defect existence of plate surface quality, cleaning temperature remains on more than 100 DEG C.(2) heating rolling: continuously cast bloom heating zone temperature is 1200 ~ 1260 DEG C, start rolling temperature is 1020 ~ 1100 DEG C, the single pass draught 40mm ~ 65mm of front 3 to 5 passages, and the overall compression ratio of rolling is >=3, finishing temperature 800 ~ 900 DEG C; After rolling completes, steel plate rolls off the production line when surface temperature 400 ~ 500 DEG C, the slow cooling of covering heap, slow cooling more than 72 hours, and slow cooling is to room temperature, and the object that steel plate rolls rear slow cooling fully reduces H content residual in steel plate, reduces the harm of H.(3) heat treatment step: Quench and temper thermal treatment is carried out to steel plate, quenching temperature is 930 DEG C, and Quenching Soaking Time is 2.0min/mm, is quickly cooled to less than 200 DEG C after coming out of the stove with water; Tempering Heating temperature is 730 DEG C, and tempering insulation time is 3.5min/mm, cools in atmosphere after coming out of the stove, and obtains steel plate finished product.
The low carbon and high ductility tank plate that the 108mm obtained via above-mentioned manufacturing process is thick has very high low-temperature impact work and numerical fluctuations is less, and the whole plate mechanical property of steel plate is even, and excellent combination property, its mechanical property refers to table 1 and table 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%, surplus is Fe and inevitable impurity element.
The production method of steel plate is substantially identical with the production method of embodiment 1, but the state of inspection sample blanks there are differences, and concrete difference is as follows:
In order to simulate stress-removal heat treatment process after Plate Welding, sample blanks from after steel plate is taken off, first in bogey according to 675 DEG C of insulations 4 hours, i.e. minimum Simulated post-weld heat treatment, and then carry out mechanical properties test.
Experiment proves: steel plate of the present invention has very high low-temperature impact work and numerical fluctuations is less, yield strength >=400MPa, tensile strength >=450MPa.The whole plate mechanical property of steel plate is even, compared with before Simulated post-weld heat treatment, without obviously reducing, refers 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%, surplus is Fe and inevitable impurity element.
Steel plate is that production method is substantially identical with the production method of embodiment 1, but the state of inspection sample blanks there are differences, and concrete difference is as follows:
In order to simulate stress-removal heat treatment process after Plate Welding, sample blanks from after steel plate is taken off, first in bogey according to 675 DEG C of insulations 12 hours, i.e. maximum analog postweld heat treatment, and then carry out mechanical properties test.
Experiment proves: steel plate of the present invention has very high low-temperature impact work and numerical fluctuations is less, yield strength >=290MPa, tensile strength >=550MPa.The whole plate mechanical property of steel plate is even, compared with before Simulated post-weld heat treatment, without obviously reducing, refers to table 1, table 2.
The mechanical property of the steel plate that each embodiment of table 1 is produced
The high-temperature behavior of the steel plate that each embodiment of table 2 is produced
Claims (3)
1. a low carbon and high ductility super-thick steel plate, is characterized in that: the chemical composition of this steel plate is C:0.08 ~ 0.12% by mass percentage, 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%, surplus is Fe and inevitable impurity element.
2. low carbon and high ductility super-thick steel plate according to claim 1, is characterized in that: the thickness of steel plate is 100 ~ 110mm.
3. manufacture a method for low carbon and high ductility super-thick steel plate as claimed in claim 1, it is characterized in that: processing step is as follows:
(1) smelt continuous casting: raw materials for metallurgy successively through KR hot metal pretreatment, converter smelting: converter tapping P≤0.008%, converter tapping temperature is 1610 ~ 1650 DEG C, takes off Slag treatment; LF refining: the white slag hold-time is not less than 25min, total refining time is not less than 45min, skims during molten steel S≤0.003%; RH vacuum deaeration refining: vacuum tightness≤0.5mbar, the vacuum hold-time is broken empty after more than 25min; Continuous casting: produce and meet the continuously cast bloom that chemical composition requires, thickness is 370mm or more, to continuously cast bloom covering slow cooling more than 72 hours, slow cooling terminated rear to the cleaning of continuously cast bloom surface band temperature, and cleaning temperature remains on more than 100 DEG C;
(2) heating rolling: continuously cast bloom is heated to 1200 ~ 1260 DEG C, start rolling temperature controls at 1020 ~ 1100 DEG C, the single pass draught 40mm ~ 65mm of front 3 to 5 passages, and the overall compression ratio of rolling is >=3, finishing temperature 800 ~ 900 DEG C; After rolling completes, steel plate rolls off the production line when surface temperature 400 ~ 500 DEG C, the slow cooling of covering heap, slow cooling more than 72 hours, and slow cooling is to room temperature;
(3) heat treatment step: Quench and temper thermal treatment is carried out to steel plate, quenching temperature is 910 ~ 940 DEG C, and Quenching Soaking Time is 1.8 ~ 2.5min/mm, is quickly cooled to less than 200 DEG C after coming out of the stove with water; Tempering Heating temperature is 710 ~ 750 DEG C, and tempering insulation time is 2.5 ~ 4.0min/mm, cools in atmosphere after coming out of the stove, and obtains steel plate finished product.
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Cited By (11)
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| CN105803336A (en) * | 2016-05-30 | 2016-07-27 | 苏州双金实业有限公司 | Steel with low maintenance cost |
| CN105803343A (en) * | 2016-05-30 | 2016-07-27 | 苏州双金实业有限公司 | Steel with excellent toughness |
| CN105839018A (en) * | 2016-05-30 | 2016-08-10 | 苏州双金实业有限公司 | Steel with low maintenance cost |
| CN108359902A (en) * | 2018-04-08 | 2018-08-03 | 无锡市法兰锻造有限公司 | A kind of high performance alloys steel flange and forging and its manufacturing method |
| CN108396227A (en) * | 2018-05-09 | 2018-08-14 | 舞阳钢铁有限责任公司 | Continuous casting billet is become a useful person A387Gr11Cl2 steel plates and its production method |
| CN109797342A (en) * | 2018-12-29 | 2019-05-24 | 江阴兴澄特种钢铁有限公司 | It is a kind of for the high intensity of structure steel fabrication, high tenacity, atmospheric corrosion resistance steel plate and its manufacturing method |
| CN109897928A (en) * | 2019-03-25 | 2019-06-18 | 江阴兴澄特种钢铁有限公司 | A kind of manufacturing method of the big thickness steel plate of the continuous casting billet production guarantee anti-lamellar tearing performance of core |
| CN112143982A (en) * | 2020-08-25 | 2020-12-29 | 江阴兴澄特种钢铁有限公司 | Simulated heat treatment process for thermal forming of CrMo steel plate for pressure container end socket |
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| CN114231834A (en) * | 2021-10-15 | 2022-03-25 | 首钢集团有限公司 | High-strength and good low-temperature toughness ultra-thick structural steel and production method thereof |
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| CN108359902A (en) * | 2018-04-08 | 2018-08-03 | 无锡市法兰锻造有限公司 | A kind of high performance alloys steel flange and forging and its manufacturing method |
| CN108396227A (en) * | 2018-05-09 | 2018-08-14 | 舞阳钢铁有限责任公司 | Continuous casting billet is become a useful person A387Gr11Cl2 steel plates and its production method |
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| CN112143982A (en) * | 2020-08-25 | 2020-12-29 | 江阴兴澄特种钢铁有限公司 | Simulated heat treatment process for thermal forming of CrMo steel plate for pressure container end socket |
| CN112143968A (en) * | 2020-08-30 | 2020-12-29 | 五矿营口中板有限责任公司 | Ultra-thick X70M-grade double-resistance pipeline steel plate and manufacturing method thereof |
| CN113667897A (en) * | 2021-08-31 | 2021-11-19 | 重庆钢铁股份有限公司 | Low-temperature toughness steel and P, As matching process thereof |
| CN114231834A (en) * | 2021-10-15 | 2022-03-25 | 首钢集团有限公司 | High-strength and good low-temperature toughness ultra-thick structural steel and production method thereof |
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