CN101781742B - Medium-thickness ship plate steel with ultrahigh intensity and low-temperature impact toughness and manufacturing method thereof - Google Patents
Medium-thickness ship plate steel with ultrahigh intensity and low-temperature impact toughness and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to medium-thickness ship plate steel with ultrahigh intensity and low-temperature impact toughness and a manufacturing method thereof. The ship plate steel comprises the following components in percentage by weight: 0.04 to 0.10 percent of C, 0.15 to 0.35 percent of Si, 1.20 to 1.70 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.04 to 0.08 percent of Nb, 0.10 to 0.20 percent of TiO, 0.20 to 0.50 percent of Cu, less than or equal to 0.30 percent of Cr, 0.20 to 0.50 percent of Ni, 0.02 to 0.05 percent of Al, 0.1 to 0.3 percent of Mo and the balance of Fe and impurities. A process comprises the following steps of: performing heating, heat insulation, two-stage rolling and cooling treatment on a precast continuous casting in sequence to manufacture finished product ship plate steel. The ship plate steel has simple component design, high comprehensive mechanical performance and high welding performance; and the preparation process is simple and easy to manipulate.
Description
Technical field
The present invention relates to a kind of special steel sheet material and preparation technology thereof, medium-thickness ship plate steel and method of manufacture thereof in particularly a kind of superstrength with good low-temperature flexibility and 550MPa rank ys.
Background technology
Deck of boat steel is one of main personality board kind of Wide and Thick Slab.China is shipbuilding big country, and is huge to the demand of deck of boat steel, shows according to relevant statistics, and China's shipbuilding completion last year amount is 3,000 ten thousand tons, and the real consumption shipbuilding is with 1,200 ten thousand tons of steel plates.And along with the fast development of China's shipbuilding, shipbuilding industry also day by day to maximize, the lightness direction develops.Therefore, the deck of boat of common intensity can not satisfy the needs of hull, and the application percentage of the E of HS, high-quality level, the F level deck of boat improves constantly.On the other hand, large ship increases weight-carrying capacity in order to alleviate deadweight; Improve the boats and ships overall performance, also make every effort to increase the high strength steel plate for ship building consumption, as; Adopting ys is the high strength steel plate for ship building replacement regular tenacity deck of boat of 400MPa, and hull mass can reduce more than 1/4th.Especially for some important special boats and ships, like warship etc., it is the steel plate of 590～780MPa that general requirement is used ys.This shows; High Strength Hull Steel will have broad application prospects in shipbuilding, yet all there are more deficiency in various deck of boat steel itself or its preparation technology of occurring at present; Still can not satisfy the needs of large-scale application on boats and ships, below illustrate:
Publication number is that the patent of invention of CN101353759A proposes a kind of low crack sensitivity steel plate having 550 Mpa grade of yield strength, and its intensity rank has reached the 550MPa level, but its impelling strength index is merely the observed value under-20 ℃;
Publication number is that the patent of invention of CN101255528A proposes the excellent niobium-containing steel plate of a kind of ultralow-temperature flexibility, though it has good low-temperature flexibility, its intensity rank is lower, and ys is 480MPa, and tensile strength is 580MPa;
But publication number is the patent of invention of CN101289728A a kind of low yield strength ratio large-line energy welded high-strength-and-toughness steel plate is proposed; Its ys has surpassed 500MPa, but the composition design is comparatively complicated, and the content of Mo is 0.10～0.40%; Low-temperature impact toughness is limited to-40 ℃ of The performance test results under the condition; Do not reach the performance index of F rank (60 ℃ of following impelling strength) deck of boat steel, and its manufacturing technique requirent is also comparatively strict, for the steel plate of thickness >=40mm; The slow cooling time at >=300 ℃ is not less than 24h, has increased manufacture difficulty;
Publication number is that the patent of invention of CN101255528A proposes a kind of ultralow-temperature flexibility excellent niobium-containing steel plate and rolling method thereof; Though this kind steel plate has good low-temperature flexibility; But in its operation of rolling, added intercooling technology; Be to adopt water spray refrigerative mode between roughing and the finish rolling, this has increased the difficulty of control in actual production.
Summary of the invention
The objective of the invention is to propose a kind of middle medium-thickness ship plate steel and preparation method thereof with superstrength and low-temperature impact toughness; The medium-thickness ship plate steel comprehensive mechanical property is good, with low cost in being somebody's turn to do, and its ME is simple; Be easy to control, thereby can overcome deficiency of the prior art.
For realizing the foregoing invention purpose, the present invention has adopted following technical scheme:
A kind of middle medium-thickness ship plate steel with superstrength and low-temperature impact toughness is characterized in that: component and weight percent thereof that this deck of boat ladle contains are:
C 0.04～0.10%, Si 0.15～0.35%, Mn 1.20～1.70%,, the Fe and the impurity of P≤0.020%, S≤0.010%, Nb 0.04～0.08%, Ti 0.0.10～0.20%, Cu 0.20～0.50%, Cr≤0.30%, Ni 0.20～0.50%, Al 0.02～0.05%, Mo 0.1～0.3% and surplus.
Particularly, weight percent sum≤0.12% of Nb, V and the Ti that comprises in the said deck of boat steel.
The thickness of said deck of boat steel is 18～40mm, and its metallographic structure along the transverse section is the combination of acicular ferrite and polygonal ferrite.
Ys >=the 550MPa of said deck of boat steel, and it is at ballistic work >=37J of-60 ℃.
A kind of method of manufacture that has the middle medium-thickness ship plate steel of superstrength and low-temperature impact toughness as stated; It is characterized in that; This method is: the continuously cast bloom that will have with said deck of boat steel same composition is heated to 1180～1250 ℃, and is incubated processing, and it is rolling rolling with the non-recrystallization district to carry out the recrystallization zone thereafter successively; Then, make finished product deck of boat steel with of the speed of cooling cooling of rolling steel plate with 10～20 ℃/s.
Further say time remaining 2～3h that said insulation is handled.
Said recrystallization zone is rolling to be rough rolling step, and its start rolling temperature is 1050～1100 ℃, and the non-recrystallization district is rolling to be the finish rolling stage, and its start rolling temperature is 800～950 ℃.
Said recrystallization zone is rolling rolling with the non-recrystallization district.During said recrystallization zone was rolling, overall compression ratio was not less than 50%; The non-recrystallization district is rolling, and overall compression ratio is not less than 60%.。
In this method, rolling steel plate is to get into the laminar flow cooling to carry out water-cooled, and it opens cold temperature is 750～830 ℃, and final cooling temperature is 380～500 ℃.
This method comprises following concrete steps:
According to said deck of boat steel constituent preparation raw materials for metallurgy, and, form continuously cast bloom with its smelting, cast;
Continuously cast bloom is heated to 1180～1250 ℃, insulation 2～3h;
Continuously cast bloom is carried out two stage rolling, and wherein the start rolling temperature of fs roughing is 1050～1100 ℃, and overall compression ratio is 50～60%, and the start rolling temperature of subordinate phase finish rolling is 800～950 ℃, and overall compression ratio is greater than 60%;
Rolling steel plate gets into the laminar flow cooling and carries out water-cooled, and opening cold temperature is 750～830 ℃, and final cooling temperature is 380～500 ℃, and speed of cooling is 10～20 ℃/s, finally makes finished product deck of boat steel.
The present invention is directed to the demand of present shipbuilding to superstrength deck of boat steel with good low-temperature flexibility; Through allotment steel component, and be employed in the rolling method with technology for controlled cooling (TMCP) of application controls on the Wide and Thick Slab production line, produced the middle medium-thickness ship plate steel with superstrength and low-temperature impact toughness of the present invention; This deck of boat steel thickness is at 18～40mm; Its mechanical property satisfies the requirement of Veritas (DNV) to corresponding steel grade, i.e. ys >=550MPa, tensile strength >=670MPa; Unit elongation >=16% ,-60 ℃ of ballistic work >=37J.
Below the effect with component that middle medium-thickness ship plate steel comprises of superstrength and low-temperature impact toughness of the present invention is specified:
C: carbon is stronger solution strengthening element; Can significantly improve armor plate strength, but reduce toughness and plasticity, obviously worsen the steel plate welding property; In the chemical composition design of deck of boat steel; In order to make steel plate have good welding property, good low-temperature impelling strength, must reduce the carbon content in the steel, make it be controlled at lower limit;
Mn: manganese reduces the steel brittle transition temperature to improving intensity, improves impelling strength and plays an important role.
S: sulphur often distributes along rolling direction with the form of strip sulfide, because it has destroyed the continuity of steel, significantly reduces ductility and toughness, the aggravation anisotropy, and its influence degree is aggravated with the raising of sulphur content.Therefore should suitably reduce sulphur content.
Al: aluminium content is the element that deck of boat steel explicitly calls for, general requirement Al >=0.020%.
Nb: niobium is through two kinds of approach crystal grain thinnings, and first Nb has obvious delayed action to austenitic recrystallize, improves the perfect recrystallization temperature, prevents that the recrystallize austenite crystal from growing up; It two is reductions along with rolling temperature, and the carbon of Nb, nitride can be separated out in austenite disperse before ferritic transformation, become ferritic forming core particle, and ferritic is formed under less condensate depression, be difficult for growing up, thereby refinement ferrite crystal grain.
Ti: titanium can produce the effect of intensive precipitation strength, and the intensity of steel is improved, and can also stop austenite recrystallization.It can produce the grain refining effect, improves the steel ys, but little to the flexible contribution.Ti also has good influence to the hardness at welded heat affecting zone place.As a kind of important microalloy element, titanium can form carbon, the nitride particles of tiny titanium, thereby in slab reheat process, can obtain comparatively tiny austenitic microstructure through the alligatoring that stops austenite crystal.In addition, the existence of the nitride particles of titanium can suppress the grain coarsening of welded heat affecting zone.Therefore, titanium can improve the low-temperature flexibility of matrix metal and welded heat affecting zone simultaneously.Because titanium can be with the fixing nomadic nitrogen atom of the nitride form of titanium, thus it can stop nomadic nitrogen form boron nitride and to the disadvantageous effect of the hardening capacity generation of steel.When aluminium content is low (being lower than about 0.005%), titanium can form a kind of oxide compound, but the microstructure of refinement welded heat affecting zone.The content of Ti generally is controlled at below 0.02%, and too much titanium content can cause the alligatoring of the nitride of titanium, and is unfavorable to low-temperature flexibility.
Ni: the interpolation of nickel generally can form the hardened microstructure constituent element of the less low-temperature flexibility that is unfavorable for steel plate.The addition that has confirmed to be higher than the nickel of 0.2wt% can effectively improve the toughness of welded heat affecting zone.The interpolation of nickel also can effectively prevent during continuous casting and hot rolling, to take place the surface cracking that copper brings out.
Cu: copper can increase the intensity of steel plate, can improve the solidity to corrosion of steel plate simultaneously.
Mo: molybdenum can improve the hardening capacity of steel, but it is unfavorable to welding property.
Cr: chromium helps improving intensity, hardening capacity, wear resistance, solidity to corrosion and high-temperature oxidation resistance, is unfavorable for weldableness.
Based on above analysis to each component in this deck of boat steel, the present invention has optimized the proportioning to the steel component, thereby makes the middle medium-thickness ship plate steel with superstrength and low-temperature impact toughness of the present invention.
Compared with prior art, the invention has the advantages that:
(1) the middle medium-thickness ship plate steel composition simplicity of design with superstrength and low-temperature impact toughness of the present invention, comprehensive mechanical property is excellent, and also has good welding property;
(2) to be equipped with technology simple for deck of boat steel of the present invention, is easy to control, and it is through the operation of rolling in non-recrystallization district; Make the sufficient flattening of austenite, in conjunction with the control corresponding process for cooling, making final phase-change product is acicular ferrite+polygonal ferrite; Thereby guaranteed the matched well of intensity and low-temperature flexibility, through the composition design of low-carbon-equivalent, guaranteed good welding property simultaneously; Through Nb, Ti microalloying, improve the mechanical property of steel plate simultaneously.
Description of drawings
Fig. 1 is the interior metallographic structure photo along the transverse section of middle medium-thickness ship plate steel that has superstrength and low-temperature impact toughness among the embodiment 1;
Fig. 2 is the interior metallographic structure photo along the transverse section of middle medium-thickness ship plate steel that has superstrength and low-temperature impact toughness among the embodiment 2;
Fig. 3 is the interior metallographic structure photo along the transverse section of middle medium-thickness ship plate steel that has superstrength and low-temperature impact toughness among the embodiment 3;
Fig. 4 is one of middle medium-thickness ship plate steel transition kinetics graphic representation that has among the embodiment 3 superstrength and low-temperature impact toughness: dependent variable influences Transformation Kinetics;
Fig. 5 be have among the embodiment 3 superstrength and low-temperature impact toughness middle medium-thickness ship plate steel transition kinetics graphic representation two: rate of cooling influences Transformation Kinetics;
Fig. 6 is one of middle medium-thickness ship plate steel continuous cooling transformation microstructure picture that has among the embodiment 3 superstrength and low-temperature impact toughness;
Fig. 7 be have among the embodiment 3 superstrength and low-temperature impact toughness middle medium-thickness ship plate steel continuous cooling transformation microstructure picture two.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment content of the present invention is described further.
The middle medium-thickness ship plate steel thickness with superstrength and low-temperature impact toughness that embodiment 1 present embodiment relates to is 32mm, and component that it comprises and weight percent thereof are: the Fe of C 0.05%, Si 0.24%, Mn 1.60%, P0.012%, S 0.0028/%, Nb 0.076%, Ti 0.016%, Cu 0.31%, Ni 0.25%, Cr 0.25%, Mo 0.2%, Al 0.042% and surplus and unavoidable impurities element.
The middle medium-thickness ship plate steel of present embodiment prepares through following technological process:
According to above-mentioned deck of boat steel chemical composition preparation raw materials for metallurgy, and, form the ingot casting of thickness 150mm with its smelting, cast;
Ingot casting is heated to 1250 ℃, insulation 2h;
Ingot casting is carried out two stage rolling, and wherein the start rolling temperature of fs roughing is 1050 ℃, and overall compression ratio is 50～60%; The start rolling temperature of subordinate phase finish rolling is 820 ℃; Total draft 64%.
Rolling steel plate gets into the laminar flow cooling and carries out water-cooled, and opening cold temperature is 760 ℃, and final cooling temperature is 400 ℃, and the about 13 ℃/s of speed of cooling finally makes above-mentioned deck of boat steel, and the mechanical property of this deck of boat steel is specifically as shown in table 1, and its structure is as shown in Figure 1.
Middle medium-thickness ship plate steel specification and component thereof with superstrength and low-temperature impact toughness that embodiment 2 present embodiments relate to are identical with embodiment 1, but the preparation technology of medium-thickness ship plate steel is in being somebody's turn to do:
According to above-mentioned deck of boat steel chemical composition preparation raw materials for metallurgy, and, form the continuously cast bloom of thickness 150mm with its smelting, cast;
Continuously cast bloom is heated to 1150 ℃, insulation 2h;
Continuously cast bloom is carried out two stage rolling, and wherein the start rolling temperature of fs roughing is 1080 ℃, treats that temperature thickness is 90mm; The start rolling temperature of subordinate phase finish rolling is 920 ℃; Total draft 64%.
Rolling steel plate gets into the laminar flow cooling and carries out water-cooled, and opening cold temperature is 780 ℃, and final cooling temperature is 400 ℃, and the about 13 ℃/s of speed of cooling finally makes above-mentioned deck of boat steel, and the mechanical property of this deck of boat steel is specifically as shown in table 2, and its structure is as shown in Figure 2.
The middle medium-thickness ship plate steel thickness with superstrength and low-temperature impact toughness that embodiment 3 present embodiments relate to is 18mm, and component that it comprises and weight percent thereof are: the Fe of C 0.05%, Si 0.22%, Mn 1.64%, P0.01%, S 0.0020/%, Nb 0.06%, Ti 0.013%, Cu 0.15%, Cr 0.25%, Ni 0.17%, Mo 0.1%, Al 0.04% and surplus and unavoidable impurities element.
The middle medium-thickness ship plate steel of present embodiment can prepare through following technological process:
According to above-mentioned deck of boat steel chemical composition preparation raw materials for metallurgy, and with its smelting, cast.Implement material and take from industrial continuously cast bloom, high 160mm, wide 150mm, long 250mm.
To implement blank heating to 1250 ℃, insulation 2h;
To implement blank and carry out two stage rolling, wherein the start rolling temperature of fs roughing is 1100 ℃, treats that temperature thickness is 51mm, and the start rolling temperature of subordinate phase finish rolling is 870 ℃; Finally roll into the steel plate of thickness 18mm.
Rolling steel plate gets into the laminar flow cooling and carries out water-cooled, and opening cold temperature is 780 ℃, and final cooling temperature is 500 ℃, and the about 20 ℃/s of speed of cooling finally makes above-mentioned deck of boat steel, and the mechanical property of this deck of boat steel is specifically as shown in table 3, and its structure is as shown in Figure 3.
Again; This case contriver also studies the preparation process of middle medium-thickness ship plate steel among this embodiment; And obtained respectively under different distortion condition (Fig. 4) and rate of cooling (Fig. 5); Form the transition kinetics curve of the steel of this deck of boat steel, and corresponding steel inner tissue structure is shown in Fig. 6～7.
Table 1 embodiment 1 has the comprehensive mechanical property of the middle medium-thickness ship plate steel of superstrength and low-temperature impact toughness
Table 2 embodiment 2 has the comprehensive mechanical property of the middle medium-thickness ship plate steel of superstrength and low-temperature impact toughness
Table 3 embodiment 3 has the comprehensive mechanical property of the middle medium-thickness ship plate steel of superstrength and low-temperature impact toughness
The foregoing description is merely explanation technical conceive of the present invention and characteristics, and its purpose is to let the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (4)
1. middle medium-thickness ship plate steel with superstrength and low-temperature impact toughness, it is characterized in that: component and weight percent thereof that this deck of boat ladle contains are:
C 0.04～0.10%, Si 0.15～0.35%, Mn 1.20～1.70%,, the Fe and the impurity of P≤0.020%, S≤0.010%, Nb 0.04～0.08%, Ti 0.0.10～0.20%, Cu 0.20～0.50%, Cr≤0.30%, Ni 0.20～0.50%, Al 0.02～0.05%, Mo 0.1～0.3% and surplus;
Further, weight percent sum≤0.12% of Nb, V and the Ti that comprises in the said deck of boat steel;
The thickness of said deck of boat steel is 18～40mm, and its metallographic structure along the transverse section is the combination of acicular ferrite and polygonal ferrite;
Ys >=the 550MPa of said deck of boat steel, and it is at ballistic work >=37J of-60 ℃.
2. method of manufacture that has the middle medium-thickness ship plate steel of superstrength and low-temperature impact toughness according to claim 1; It is characterized in that; This method is: the continuously cast bloom that will have with said deck of boat steel same composition is heated to 1180～1250 ℃, and insulation handles 2～3h, and it is rolling rolling with the non-recrystallization district to carry out the recrystallization zone thereafter successively; Then, make finished product deck of boat steel with of the speed of cooling cooling of rolling steel plate with 10～20 ℃/s;
Said recrystallization zone is rolling to be rough rolling step, and its start rolling temperature is 1050～1100 ℃, and overall compression ratio is not less than 50%, and the non-recrystallization district is rolling to be the finish rolling stage, and its start rolling temperature is 800～950 ℃, and overall compression ratio is not less than 60%.
3. a kind of method of manufacture that has the middle medium-thickness ship plate steel of superstrength and low-temperature impact toughness according to claim 1 according to claim 2; It is characterized in that; In this method; Rolling steel plate is to get into the laminar flow cooling to carry out water-cooled, and it opens cold temperature is 750～830 ℃, and final cooling temperature is 380～500 ℃.
4. a kind of method of manufacture that has the middle medium-thickness ship plate steel of superstrength and low-temperature impact toughness according to claim 1 according to claim 2 is characterized in that this method comprises following concrete steps:
According to said deck of boat steel constituent preparation raw materials for metallurgy, and, form continuously cast bloom with its smelting, casting;
Continuously cast bloom is heated to 1180～1250 ℃, insulation 2～3h;
Continuously cast bloom is carried out two stage rolling, and wherein the start rolling temperature of fs roughing is 1050～1100 ℃, and overall compression ratio is 50～60%, and the start rolling temperature of subordinate phase finish rolling is 800～950 ℃, and overall compression ratio is greater than 60%;
Rolling steel plate gets into the laminar flow cooling and carries out water-cooled, and opening cold temperature is 750～830 ℃, and final cooling temperature is 380～500 ℃, and speed of cooling is 10～20 ℃/s, finally makes finished product deck of boat steel.
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| CN101906591B (en) * | 2010-08-30 | 2012-08-22 | 南京钢铁股份有限公司 | Ultra high strength ship plate steel and production method thereof |
| CN101984119B (en) * | 2010-11-26 | 2012-07-11 | 江苏省沙钢钢铁研究院有限公司 | NV-F690 ultrahigh strength ship plate steel and manufacture method thereof |
| CN102127719B (en) * | 2011-03-10 | 2012-11-14 | 东北大学 | Thick steel plate for ocean platform structure with yield strength of 500MPa grade and manufacture method thereof |
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| CN102286693B (en) * | 2011-07-28 | 2014-01-08 | 莱芜钢铁集团有限公司 | Thick ship plate steel and preparation method thereof |
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| CN103147000B (en) * | 2013-03-20 | 2014-12-03 | 钢铁研究总院 | Polygonal ferrite-acicular ferrite two-phase steel plate/belt and production method thereof |
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| CN105821323A (en) * | 2016-06-13 | 2016-08-03 | 苏州双金实业有限公司 | Steel with good stability |
| CN108085592B (en) * | 2017-12-08 | 2019-12-31 | 南京钢铁股份有限公司 | Ship plate steel with yield strength of 390MPa grade and thickness of less than or equal to 100mm and preparation method |
| CN111304530B (en) * | 2020-02-26 | 2021-08-17 | 江苏省沙钢钢铁研究院有限公司 | Large-thickness high-toughness steel plate and production method thereof |
| CN111961961A (en) * | 2020-07-24 | 2020-11-20 | 东北大学 | High-strength ship plate steel for TMCP (thermal mechanical control processing) state low-compression ratio extremely cold environment and manufacturing method thereof |
| CN113249659B (en) * | 2021-04-15 | 2022-01-18 | 首钢集团有限公司 | High-strength anti-crack steel with excellent ductility and preparation method thereof |
| CN114855085B (en) * | 2022-05-19 | 2023-08-15 | 南京钢铁股份有限公司 | Marine low-temperature L-shaped steel and welding process thereof |
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Denomination of invention: Medium thick ship plate steel with ultra-high strength and low temperature impact toughness and its manufacturing method Effective date of registration: 20220721 Granted publication date: 20120711 Pledgee: China Construction Bank Zhangjiagang branch Pledgor: INSTITUTE OF RESEARCH OF IRON & STEEL, JIANGSU PROVINCE/SHA-STEEL, Co.,Ltd. Registration number: Y2022320010410 |
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