CN101418417A - Wide heavy standard high strength ship plate steel and technique for producing the same - Google Patents
Wide heavy standard high strength ship plate steel and technique for producing the same Download PDFInfo
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Abstract
The invention relates to high-strength steel and a process for producing the same. The components of high-strength ship plate steel by width-thickness specification are as follows: 0.04 to 0.16 percent of C, 1.20 to 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 0.10 to 0.30 percent of Si, less than or equal to 0.40 percent of Ni, 0.020 to 0.060 percent of Alt, 0.02 to 0.05 percent of Nb, less than or equal to 0.02 percent of Ti, less than or equal to 0.012 percent of N, and the balance being Fe. The temperature in a smelting and heating furnace is between 1180 and 1220 DEG C, and the heating time is between 3.0 and 4.0 hours; the starting temperature for rough rolling is between 1080 and 1120 DEG C, and the rough rolling is performed for 4 to 6 times; the starting temperature for finish rolling is between 800 and 900 DEG C, and the finish rolling is performed for 4 to 9 times, and the finishing temperature is between 800 and 830 DEG C; and the starting water spray cooling temperature for cold control is between 780 and 820 DEG C, and the finishing water spray cooling temperature is between 600 and 720 DEG C. The invention has the advantages of simple process, high production efficiency, stable product performance, and mall quality fluctuation.
Description
Technical field
The present invention relates to a kind of high-strength steel and production technique thereof, generous specifically intensity deck of boat steel with a high standard and production technique thereof.
Background technology
The price of ship steel shared proportion in shipbuilding production cost expense is about 15-20%, accounts for more than 70% in boats and ships raw material supply price.The steel of shipbuilding industry demand mainly comprise sheet material, section bar and tubing, wherein again based on sheet material.Along with increasing substantially of shipbuilding output, and the requirement of boats and ships maximization, lightweight, specialization and high technology content, the development trend of making ship steel future is: the demand of Hi-Stren steel will increase considerably; Boats and ships will maximize with Wide and Thick Slab; Specification and dimensional precision will be higher; Quality will further improve, and kind will increase.
Now, can adopt several diverse ways for the production of generous intensity deck of boat steel with a high standard.But most of steel production enterprise adopt microalloying to cooperate the production technique of controlled rolling and controlled cooling to carry out the production of deck of boat steel, to satisfy the requirement of shipbuilding industry.Because the various performance requriements harshnesses of generous intensity deck of boat steel with a high standard will be brought many difficulties to its design of chemical composition, the test that need carry out repeatedly could be determined, has greatly restricted the paces of deck of boat manufacturing enterprise product up-gradation.The production of generous intensity deck of boat steel with a high standard is thick because of its size, and specification is big, so it is even easily to produce tissue odds, especially the tissue on the thickness direction is difficult to control, causes that surface of steel plate and heart portion performance differ, steel plate low-temperature flexibility value is not good; And easily produce distortion, especially template control is difficult on the width, so can cause the plate size deviation bigger.Various because of the controlled rolling and controlled cooling Production Flow Chart again, complex manufacturing, strict to the control of steel plate, especially need to control accurately in rolling deformation and the water spray process of cooling, so can cause the product accepted product percentage low, problem such as quality product fluctuation is big, and production efficiency is not high.At present, the chemical ingredients for deck of boat steel is optimized design and develops a kind of technology controlled rolling and controlled cooling production technique simple, that be easy to control one of method that is the generous intensity deck of boat steel production difficult problem with a high standard of solution.
Summary of the invention
Technical problem to be solved by this invention is: at the shortcoming that above prior art exists, it is simple to propose a kind of technology, the production efficiency height, and product performance are stable, intensity deck of boat steel generous with a high standard and production technique thereof that quality fluctuation is little.
This has the technical scheme that solves above technical problem to be:
Generous intensity deck of boat steel with a high standard comprises following moiety: C0.04%～0.16% by weight percentage, and Mn 1.20%～1.60%, P≤0.025%, and S≤0.025%, Si 0.10～0.30%, Ni≤0.40%, Al
t0.020～0.060%, Nb 0.02%～0.05%, Ti≤0.02%, and N≤0.012%, its amount is Fe.
The production technique of generous intensity deck of boat steel with a high standard comprises smelting, roughing, finish rolling and controlled chilling operation,
In the smelting procedure, process furnace internal heating temperature is 1180 ℃～1220 ℃, and be 3.0～4.0h heat-up time;
In the roughing operation, start rolling temperature is 1080 ℃～1120 ℃, and it is rolling to carry out 4～6 passages, and total reduction is 50%～60%;
In the finish rolling operation, start rolling temperature is 800 ℃～900 ℃, and it is rolling to carry out 4～9 passages, and total reduction is 40%～60%, and finishing temperature is 800～830 ℃;
In the controlled chilling operation, the cooling temperature that begins to spray water is 780 ℃～820 ℃, and stopping the water spray cooling temperature is 600 ℃～720 ℃.
In other generous intensity deck of boat steel with a high standard of ad eundem, reduce carbon content, improve Mn to greatest extent, Ni content, interpolation Nb, Ti microalloy element and C, N and the ratio of rationally controlling microalloy element.Reducing carbon content is in order to improve the welding property of deck of boat steel.Improve Mn to greatest extent, Ni content had both guaranteed enough strong hardness, can reduce the tough crisp temperature of material simultaneously again.Add Nb, Ti microalloy element and C, N is to separate out high temperature Ti (C for disperse with the ratio of rationally controlling microalloy element, tiny carbide such as N), thereby original austenite grain size and the welding property of improving product in the heating of control slab and the insulating process; And add the Nb element is in order to improve austenite recrystallization temperature, cooperate the Rolling Production process of deck of boat steel, the last operation of rolling of finish rolling is carried out in the non-recrystallization zone of austenite, thereby produce the work hardening effect, thereby refinement matrix, and the carbonitride strengthening phase of disperse distribution nano-scale.
High-strength ship plates of the present invention is organized as ferrite+perlite, and surface structure is an acicular ferrite, and heart portion is changeable shape ferrite.When producing this kind high tensile steel plate, process furnace internal heating temperature will remain on 1180 ℃～1220 ℃, and heat-up time, 3～4h was in order to prevent that austenite from growing up unusually.What carry out rolling and finish rolling stage of 4 ~ 6 passages at rough rolling step is that 4～9 passages are rolling even in order to produce size, has the tissue of work hardening, and separates out (Ti, Nb) (C, tiny carbide such as N).And be in order to quicken austenite, thereby produce tiny ferrite crystal grain to ferritic transformation in cold stage of control water spray temperature controlling.
The invention has the advantages that and solved generous intensity deck of boat structure of steel with a high standard, that especially organizes on the thickness direction is inhomogeneous, unmanageable difficult point, and obtain matrix evenly tiny (9～10 grades) and disperse distribution nano level precipitation strength phase, product strength height (ReH 〉=390MPa, Rm 〉=510MPa, A 〉=20%) ,-60 ℃ of low-temperature impact toughness value (vertical Akv 〉=41J; Horizontal Akv 〉=27J), and the sheet metal thickness directional performance is stable, surpasses surveying society's Valuation Standard.This steel production technique is simple, the production efficiency height, and product performance are stable, and quality fluctuation is little.
Description of drawings
Fig. 1 is the surperficial metallographic structure figure of the intensity deck of boat steel generous with a high standard of embodiment one.
Fig. 2 is the metallographic structure figure of heart portion of the intensity deck of boat steel generous with a high standard of embodiment one.
Fig. 3 is the carbide shape appearance figure of the intensity deck of boat steel generous with a high standard of embodiment one.
Fig. 4 is the carbide TEM diffraction spot point diagram of the intensity deck of boat steel generous with a high standard of embodiment one.
Embodiment
Embodiment one
The moiety of the intensity deck of boat steel generous with a high standard of present embodiment is (weight percent): C 0.06%, and Mn 1.53%, and P 0.009%, and S 0.002%, Si 0.20%, and N 0.0060%, and Ni 0.25%, and Alt 0.036%, Nb 0.040%, and Ti 0.013%, and all the other are Fe content.
The production technique of the intensity deck of boat steel generous with a high standard of present embodiment is: slab is put into process furnace heat, Heating temperature is 1200 ℃, and be 3.5h heat-up time.Come out of the stove then, enter rough rolling step, start rolling temperature is 1100 ℃, and it is rolling to have carried out 6 passages, and when 6 passages were rolling, every time draught was respectively 12.5%, 13%, 15%, 16%, 16%, 12%, and total reduction is 60%.And then enter the finish rolling stage, start rolling temperature is 840 ℃, and it is rolling to have carried out 4 passages altogether, and every time draught is respectively 16%, 14%, 12%, 9%, and total reduction is 42%.Control in the cold stage, the cooling temperature that begins to spray water is 810 ℃, and stopping the water spray cooling temperature is 625 ℃.Obtain the ferrite+perlite that is organized as of generous intensity deck of boat steel with a high standard.
Fig. 1 is the surperficial metallographic structure figure of the intensity deck of boat steel generous with a high standard of present embodiment, and the surface of steel plate metallographic structure is the mixed structure that ferrite and bainite are formed as seen from the figure.
Fig. 2 is the metallographic structure figure of heart portion of the intensity deck of boat steel generous with a high standard of present embodiment, and the metallographic structure of steel plate heart portion is the mixing ferrite and the perlite of strip as seen from the figure.
Fig. 3 is the carbide shape appearance figure of the intensity deck of boat steel generous with a high standard of present embodiment, at intragranular the mutual mat of a large amount of dislocations is arranged as seen from the figure, and fault on the throne has carbide to separate out, and the carbide pinning is in the dislocation place.
Fig. 4 is the carbide TEM diffraction spot point diagram of the intensity deck of boat steel generous with a high standard of present embodiment, and carbide is mainly tiny Ti (C, N) etc. in this steel as seen from the figure.
Embodiment two
The moiety of the intensity deck of boat steel generous with a high standard of present embodiment is (weight percent): C 0.04%, and Mn 1.20%, and P 0.010%, and S 0.009%, Si 0.10%, and N 0.0090%, and Ni 0.20%, and Alt 0.030%, Nb 0.002%, and Ti 0.010%, and all the other are Fe content.
The production technique of the intensity deck of boat steel generous with a high standard of present embodiment is: slab is put into process furnace heat, Heating temperature is 1180 ℃, and be 3.0h heat-up time.Come out of the stove then, enter rough rolling step, start rolling temperature is 1080 ℃, and it is rolling to have carried out 4 passages, and when 4 passages were rolling, every time draught was respectively 12%, 13%, 14%, 11%, and total reduction is 50%.And then enter the finish rolling stage, start rolling temperature is 800 ℃, and it is rolling to have carried out 4 passages altogether, and every time draught is respectively 16%, 14%, 12%, 9%, and total reduction is 40%.Control in the cold stage, the cooling temperature that begins to spray water is 780 ℃, and stopping the water spray cooling temperature is 600 ℃.Obtain the ferrite+perlite that is organized as of generous intensity deck of boat steel with a high standard.
Embodiment three
The moiety of the intensity deck of boat steel generous with a high standard of present embodiment is (weight percent): C 0.16%, and Mn 1.60%, and P 0.025%, and S 0.025%, Si 0.30%, and N 0.012%, and Ni 0.40%, and Alt 0.060%, Nb 0.050%, and Ti 0.02%, and all the other are Fe content.
The production technique of the intensity deck of boat steel generous with a high standard of present embodiment is: slab is put into process furnace heat, Heating temperature is 1220 ℃, and be 4h heat-up time.Come out of the stove then, enter rough rolling step, start rolling temperature is 1120 ℃, and it is rolling to have carried out 6 passages, and when 6 passages were rolling, every time draught was respectively 12.5%, 13%, 15%, 16%, 16%, 12%, and total reduction is 60%.And then enter the finish rolling stage, start rolling temperature is 900 ℃, and it is rolling to have carried out 9 passages altogether, and every time draught is respectively 16%, 14%, 12%, 9%, 16%, 14%, 12%, 9%, 12%, and total reduction is 60%.Control in the cold stage, the cooling temperature that begins to spray water is 820 ℃, and stopping the water spray cooling temperature is 720 ℃.Obtain the ferrite+perlite that is organized as of generous intensity deck of boat steel with a high standard.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of protection of present invention.
Claims (2)
1. generous intensity deck of boat steel with a high standard, it is characterized in that: comprise following moiety: C 0.04%～0.16% by weight percentage, Mn 1.20%～1.60%, P≤0.025%, S≤0.025%, Si 0.10～0.30%, Ni≤0.40%, Al
t0.020～0.060%, Nb0.02%～0.05%, Ti≤0.02%, N≤0.012%, its amount is Fe.
2. the production technique of generous intensity deck of boat steel with a high standard as claimed in claim 1 comprises smelting, roughing, finish rolling and controlled chilling operation, it is characterized in that:
In the described smelting procedure, process furnace internal heating temperature is 1180 ℃～1220 ℃, and be 3.0～4.0h heat-up time;
In the described roughing operation, start rolling temperature is 1080 ℃～1120 ℃, and it is rolling to carry out 4～6 passages, and total reduction is 50%～60%;
In the described finish rolling operation, start rolling temperature is 800 ℃～900 ℃, and it is rolling to carry out 4～9 passages, and total reduction is 40%～60%, and finishing temperature is 800～830 ℃;
In the described controlled chilling operation, the cooling temperature that begins to spray water is 780 ℃～820 ℃, and stopping the water spray cooling temperature is 600 ℃～720 ℃.
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| CN101812639A (en) * | 2010-04-20 | 2010-08-25 | 马鞍山钢铁股份有限公司 | Steel used for welding hull with high strength and high input energy and production method thereof |
| CN101549364B (en) * | 2009-05-15 | 2010-10-27 | 首钢总公司 | Method of using hot tandem rolling broad strip mill to produce steel plate for ship hull structure use |
| CN101948984A (en) * | 2010-09-07 | 2011-01-19 | 舞阳钢铁有限责任公司 | Steel plate for heavy-duty generator and manufacturing method thereof |
| CN101985129A (en) * | 2010-09-08 | 2011-03-16 | 湖南华菱湘潭钢铁有限公司 | Rolling method for negative common difference steel plate |
| CN102127707A (en) * | 2011-03-14 | 2011-07-20 | 莱芜钢铁集团有限公司 | Ultra-thick steel plate with high strength and high low-temperature toughness and production method thereof |
| CN101701326B (en) * | 2009-10-28 | 2011-07-20 | 南京钢铁股份有限公司 | High strength and high toughness ship plate steel with thick specification and production method thereof |
| CN102199724A (en) * | 2011-04-25 | 2011-09-28 | 江苏省沙钢钢铁研究院有限公司 | Alloy reduced ship plate steel with yield strength of 355MPa and preparation process thereof |
| CN102277529A (en) * | 2011-07-28 | 2011-12-14 | 莱芜钢铁集团有限公司 | High-strength high-tenacity ship plate steel and TMCP (Thermal Mechanical Control Process) production technology method thereof |
| CN102286701A (en) * | 2011-05-12 | 2011-12-21 | 南京钢铁股份有限公司 | Thick plate for ultra-high-intensity boat body structure and production method thereof |
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| CN102676933A (en) * | 2012-05-23 | 2012-09-19 | 南京钢铁股份有限公司 | Low-alloy super-strength high-toughness steel plate and production method thereof |
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2008
- 2008-12-04 CN CNA2008102357291A patent/CN101418417A/en active Pending
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| CN101549364B (en) * | 2009-05-15 | 2010-10-27 | 首钢总公司 | Method of using hot tandem rolling broad strip mill to produce steel plate for ship hull structure use |
| CN101701326B (en) * | 2009-10-28 | 2011-07-20 | 南京钢铁股份有限公司 | High strength and high toughness ship plate steel with thick specification and production method thereof |
| CN101812639A (en) * | 2010-04-20 | 2010-08-25 | 马鞍山钢铁股份有限公司 | Steel used for welding hull with high strength and high input energy and production method thereof |
| CN101948984A (en) * | 2010-09-07 | 2011-01-19 | 舞阳钢铁有限责任公司 | Steel plate for heavy-duty generator and manufacturing method thereof |
| CN101985129A (en) * | 2010-09-08 | 2011-03-16 | 湖南华菱湘潭钢铁有限公司 | Rolling method for negative common difference steel plate |
| CN102127707A (en) * | 2011-03-14 | 2011-07-20 | 莱芜钢铁集团有限公司 | Ultra-thick steel plate with high strength and high low-temperature toughness and production method thereof |
| CN102199724A (en) * | 2011-04-25 | 2011-09-28 | 江苏省沙钢钢铁研究院有限公司 | Alloy reduced ship plate steel with yield strength of 355MPa and preparation process thereof |
| CN102286701A (en) * | 2011-05-12 | 2011-12-21 | 南京钢铁股份有限公司 | Thick plate for ultra-high-intensity boat body structure and production method thereof |
| CN102277529A (en) * | 2011-07-28 | 2011-12-14 | 莱芜钢铁集团有限公司 | High-strength high-tenacity ship plate steel and TMCP (Thermal Mechanical Control Process) production technology method thereof |
| CN102534371B (en) * | 2012-01-04 | 2013-07-17 | 莱芜钢铁集团有限公司 | Mg-containing steel plate for TMCP (Thermal Mechanical Control Processing) type E460 ultrahigh-strength ship structure and production method thereof |
| CN102534371A (en) * | 2012-01-04 | 2012-07-04 | 莱芜钢铁集团有限公司 | Mg-containing steel plate for TMCP (Thermal Mechanical Control Processing) type E460 ultrahigh-strength ship structure and production method thereof |
| CN102676933A (en) * | 2012-05-23 | 2012-09-19 | 南京钢铁股份有限公司 | Low-alloy super-strength high-toughness steel plate and production method thereof |
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| CN113174537A (en) * | 2021-04-13 | 2021-07-27 | 鞍钢股份有限公司 | Large-thickness FH40 shipbuilding steel plate and manufacturing method thereof |
| CN113174536A (en) * | 2021-04-13 | 2021-07-27 | 鞍钢股份有限公司 | Economical low-temperature toughness E-grade high-strength steel plate for ship and manufacturing method thereof |
| CN113174537B (en) * | 2021-04-13 | 2022-07-22 | 鞍钢股份有限公司 | Large-thickness FH40 shipbuilding steel plate and manufacturing method thereof |
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Open date: 20090429 |