• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    ABSTRACT OF THE DISCLOSURE The present invention discloses a superstrength cold rolled weathering steelsheet, wherein the weight percentage of the chemical elements thereof are asfollows: C: 0.05~0.16%; Mn: 1.00~2.20%; Al: 0.02~0.06%; Cu: 0.20~0.40%; Cr:0.40~0.60%; Ti: 0.015~0.035%; P: less than 0.03%; and C+Mn/16 is more than0.19% and less than 0.23%; the remainders thereof being Fe and other unavoidableimpurities. The present invention also discloses a method of manufacturing saidsuperstrength cold rolled weathering steel sheet, comprising the following stages:smelting, heating and preservation, hot rolling, coiling, pickling, cold rolling,continuous annealing and skin passing. The advantages of the superstrength coldrolled weathering steel sheet and the method of manufacturing the same are: highstrength, i.e., the yield strength more than 700MPa and the tensile strength morethan 1000MPa; excellent performance of atmosphere corrosion resistance; thin soas to meet the demand of reducing the thickness and weight thereof; good shapeand surface quality.
    公开号:SE539940C2
    申请号:SE1551047
    申请日:2014-03-26
    公开日:2018-02-06
    发明作者:Zhong Yong；Wang Li；Feng Weijun；He Xiaoming；Huang Junjie；Ke Yanglin
    申请人:Baoshan Iron & Steel；
    IPC主号:
    专利说明:

    [1] [0001]manufacturing the same, and in particular, to a weathering alloy steel sheet and a The present invention relates to an alloy steel sheet, and a method of method of manufacturing the same.
    [2] [0002]materials, to adopt thin steel sheet of higher strength to make steel structures Currently, it is a major tendency of the development of steel and iron thinner and lighter. At the same time, those hot rolled or cold rolled weatheringsteel sheets which are widely applied in transportation industries, evolve in thedirection of higher strength and lower alloy content, so as to meet the demands ofthe terminal customers on weight reduction, energy conservation, lower cost.Since 1930s when United States Steel Corporation first developed low-alloyCorten steel containing Cu with erosion resistance and high tensile strength, aseries of Corten A steel with high content of P and Cu plus Cr, Ni, and a series ofCorten B steel with alloying Cr, Mn, Cu, had been formed. Subsequently, aseries of weathering steels treated by rare earth were developed in China. Withrespect to improving the strength of the weathering steel, the major measures aresolid solution strengthening, precipitation strengthening, transformationstrengthening, etc., wherein the latter two strengthening methods are mainly employed to improve the strength of weathering steel of super strength.
    [3] [0003] China patent of Publication No.CN1884608A, published on Dec. 27,2006 and titled “method of producing 700MPa level V-N micro-alloying high-strength atmosphere corrosion resistant steel based on continuous casting androlling process of thin slab”, discloses a method of producing high-strengthatmosphere corrosion resistant steel. Depending on the characteristics ofcontinuous casting and rolling process and metallurgical compositions of thin slab,the method adopts processes of electric furnace or converter smelting, refining,thin slab continuous casting, entering the roller hearth heating or soaking furnacedirectly after casting blanks solidify, hot rolling, laminar cooling and coiling, wherein, the ranges (vvt%) of chemical compositions of the molten steel are: C:less than or equal to 0.08%; Si:0.25~ 0.75%; Mn:0.8~2.0%; P: 0.070~0.150%; S:less than or equal to 0.040%; Cu: 0.25~0.60 %; Cr: 0.30~1.25wt%; Ni: less thanor equal to 0.65%; V: 0.05~0.20%; N: 0.015~0.030%.
    [4] [0004] US patent of Publication No.US6056833, published on May 2, 2000 andtitled “thermomechanically controlled processed high strength weathering steelwith low yield/tensile ratio” relates to a weathering steel sheet with a lowyield/tensile ratio that has a minimum yield strength of 70-75 ksi and ayield/tensile ratio less than or equal to about 0.85. The chemical compositions ofthe weathering steel sheet consists (vvt%) of C: 0.08~0.12%; Mn: 0.80~1.35%; Si:0.30~0.65%; Mo: 0.08~0.35%; V: 0.06~0.14%; Cu: 0.20~0.40%; Ni: 0.50%; Cr:0.30~0.70%; P: 0.010~0.020%; Nb: less than or equal to 0.04%; Ti: less than orequal to 0.02%; S: less than or equal to 0.01%; the remainders thereof being Feand other unavoidable impurities.
    [5] [0005] Korean patent of Publication No.KR431839, published on May 20, 2004,and titled “method of producing cold rolled weathering steel sheet", discloses amethod of producing the cold rolled atmosphere corrosion resistant steel sheet,wherein , the chemical compositions of the steel sheet consist of C: 0.06~0.08vvt%; Si: 0.17~0.24 vvt%; Mn: 0.9~1.10 vvt%; P: less than or equal to 0.020 vvt%; S:less than or equal to 0.010 vvt%; Cu: 0.20~0.30vvt%; Ni: 0.20~0.30 vvt%; H: lessthan or equal to 2.5 ppm, the remainders thereof being Fe and other unavoidableimpurities. The steel sheet has a tensile strength of more than or equal to 45kgf/mm2, a yield strength of more than or equal to 32kgf/mm2, and an elongationrate of more than or equal to 22%.
    [6] [0006]to produce the weathering steel sheet, and due to the limitation with respect to the The aforementioned first and second patents use hot rolling processes thickness of steel sheet in hot rolling units, the weathering steel sheet produced inhot rolling process has often a large thickness, and further, the limit thickness ofavailable the hot rolling steel sheet increases with the improvement of the strengththereof. Besides, the shape and surface quality of the hot rolling steel sheet is stillpoor than that of cold rolling steel sheet. Although the above third patent adopts cold rolling process to produce the weathering steel, the steel sheet presents alow strength(the yield strength is only 300MPa) , which cannot be widely used inthe production of high strength steel structures.
    [7] [0007]superstrength cold rolled weathering steel sheet, that has a large strength, a small One of the objectives of the present invention is to provide a thickness, excellent resistance to atmosphere corrosion resistant, good shape andsurface quality, so as to accommodate with the tendency of thinner and lightersteel structures; additionally, it does not contain the element Si, thereby improving the trhehuteetutrebtiltity: :efthe trheterietle, :her the element: tthereby: reduteihst: the t « f " production cost.
    [8] [0008]proposes a superstrength cold rolled weathering steel sheet, the weight To achieve the aforementioned objectives, the present invention percentage of the chemical elements of which are as follows: C: 0.05~0.16%; Mn: 1.00~2.20%; Al: 0.02~0.06%; Cu: 0.20~0.40%; Cr: 0.40~0.60%; Ti: 0.015~0.035%; P: less than or equal to 0.03%; the remainders thereof being Fe and other unavoidable impurities. The unavoidable impurities in this technical solution consist primarily of elements S and N; and further includes unavoidable residual trace element Si.[0009] Preferably, the weight percentage of the chemical elements of the superstrength cold rolled weathering steel sheet are further defined as follows: C: 0.07~0.15%;Mn: 1.30~2.00%;Al: 0.02~0.04%; Cu: 0.25~0.35%;P: less than or equal to 0.Q15%.
    [10] [0010]more beneficial in practice.
    [11] [0011]steel sheet further includes Ni of less than 0.20wt%, and a suitable amount of Ni Preferably, the above-mentioned superstrength cold rolled weathering is added to further improve the weathering performance of the steel sheet.
    [12] [0012] cold rolled weathering steel sheet is martensite, the volume fraction of which is Furthermore, the microstructure of the above-mentioned superstrength more than 95%.
    [13] [0013]rolled weathering steel sheet is 0.8~1.5mm.
    [14] [0014]rolled weathering steel sheet as mentioned in this invention is as follows: The design principle of the chemical elements of the superstrength cold
    [15] [0015]improve the hardenability and strength effectively. The present invention relates to C: C is the most fundamental strengthening element in steel, able to a weathering steel subjected to high hydrogen cooling, which has a maximumcooling speed of 150°C/s. The content of C has to be more than 0.05% in order toachieve martensite phase transformation. But if it is more than 0.16%, the weldingperformance of the steel may not meet the demand in use. ln light of this andtaking the strength and operational performance of the material into account, thecontent of C in the present invention is controlled in the range of 0.05~0.16vvt%.Preferably, the range thereof is 0.07~0.15wt%.
    [16] [0016]the strength of the steel sheet. To obtain the steel in the present invention that Mn: Mn is a solid solution strengthening element, benefitting for improve has a yield strength of more than or equal to 700MPa, and a tensile strength ofmore than or equal to 1000MPa, the content of Mn has to be more than 1.0%. Butexcessive Mn may result in the reduction of the welding performance and inadequacy of the elongation rate. To meet the demand that the elongation rate ismore than or equal to 5%, the content of Mn should be less than equal to 2.2%. lnsum, the content of Mn in the present invention is designed to be 1.00~2.20wt%,and further, 1.30~2.00wt%. Both C and Mn have the effect of improving thestrength of the material and reducing the welding performance thereof, hence, thecontent of them cannot be the maximum or minimum value in the presentinvention. ln order to meet the above requirements, the relationship between thecompositions C and Mn is designed to be: 0.19% invenfion.
    [17] [0017]invention is required to be of good cold bending property, but excessive content of Al: the addition of Al aims for deoxidization. The steel in the present O may result in the degradation of the formation performances of the material, likecold bending. ln order to satisfy the demand on the formation performances of thesteel, the content of Al should not be less than 0.02%. However, excessive Al mayresult in too many impurities such as AlN in the steel sheet, reducing theelongation rate of the material. ln light of this, taking both the deoxidizationimpurities into account, the content of carbon should be controlled in 0.02~0.06%,and preferably, 0.02~0.04%.
    [18] [0018]and P between the base strip and the rust layer, which bonds tightly with the base Cu: Cu involves in forming a barrier with the primary components Cu strip to protect the same well. Furthermore, Cu can also compensate theimpairment of impurity element S in the steel sheet. ln order to ensure theweathering performance required by the steel sheet in the present invention, thecontent of Cu should not be less than 0.2%. But the addition of excessive Cu maycause serious problem such as “Cu brittleness”. The maximum amount of Cushould be 0.4%, in such a way to coordinate with the addition of the element Ni.Accordingly, in the present invention, the content of Cu in the superstrength coldrolled weathering steel sheet should be set in 0.20~0.40wt%, and in the preferred solution, the content may be set in 0.25~0.35%.
    [19] [0019]steel sheet, so as to improve the ability of deactivation of the steel sheet, and Cr: Cr involves in forming an dense oxidized film on the surfaces of the especially when Cr and Cu are added into steel simultaneously, the effect is moreobvious; in the present technical solution, it is needed that the weight percentageof Cr should be controlled in 0.40~0.60%.
    [20] [0020]improve the formation performance of the steel sheet through precipitation Ti: Ti is the main element for the formation of carbonitride, which canstrengthening and fine crystal strengthening. Accordingly, the weight percentageof Ti in the present invention should be designed to be in 0.015~0.035%. [oo211 steels, P together with Cu in the present invention may form a barrier for resisting P: specifically speaking, although P is the impurity element in most erosion, thereby improving the performance of the atmosphere corrosionresistance of the steel sheet; at the same time, it has an effect of solid solutionstrengthening. However, excessive P may increase the brittleness of the steel anddegrade the welding performance thereof, whereby the weight percentage of Pshould be controlled to be less than or equal to 0.030% and preferably less than or equal to 0.015%. [oo221 caused by the addition of Cu. ln order to obtain good effect and reduce the cost, Ni: the addition of Ni aims for alleviating the problem of “Cu brittleness”the ratio of Cu and Ni should be less than or equal to 2/3. Based on this, the content of Ni in the present invention is designed to be less than or equal to 0.2%.
    [23] [0023]with the aforementioned superstrength cold rolled weathering steel sheet. This The present invention further provides a container panel manufactured container panel has a good shape and superior surface quality.
    [24] [0024]manufactured with the aforementioned superstrength cold rolled weathering steel The present invention further provides a vehicle structure panel sheet. This vehicle structure panel has a light weight and a high strength.
    [25] [0025]manufacturing the aforementioned superstrength cold rolled weathering steel Correspondingly, the present invention further provides a method of rolling, coiling, pickling, cold rolling, continuous annealing, skin passing; wherein, in the continuous annealing process, the annealing temperature is 830~880°C so sheet, comprising the following stages: smelting, heating and preservation,hot] " as to enable the complete austenization, then the steel is cooled rapidly in an highhydrogen atmosphere so as to attain martensite structure.
    [26] [0026]continuous annealing process and the annealing temperature higher than that in ln the manufacturing process, the present invention adopts the the prior art, so as to ensure the austenization before the steel sheet is cooledrapidly. The temperature can be controlled by adjusting the extent of austenization,in order to modulate the mechanical and forming properties of the finishedproducts. ln the process of rapid cooling, the high hydrogen atmosphere is utilizedfor rapid cooling, to obtain martensite micro-structure therein; comparing to thewater quenching process, the cooling effect in rapid cooling process in the highhydrogen atmosphere is more even, thereby not only reducing the production costof steel, but also obtaining more excellent shape and surface quality.
    [27] [0027]volume fraction of hydrogen in the high hydrogen atmosphere is 60%.
    [30] [0030]is heated and preserved at 1170~1200°C. The technical solution adopts low heating and preserving temperatures, in order to reduce the adverse effect by Cuon the thermoplastic performance of the steel, under the premise of ensuring thecomplete soluting of the C, N compound.
    [31] [0031]temperature is more than or equal to Ar3.
    [33] [0033]therein is 50~60%.
    [34] [0034]with the reasonable composition design and suitable technological processes, The superstrength cold ro|ed weathering steel sheet in the invention, presents superior effect in practice: it presents excellent performance ofatmosphere corrosion resistance; high strength, i.e., the yield strength more than700MPa and the tensile strength more than 1000MPa; good shape and surface quality.
    [35] [0035]detailed embodiments, to further specify the superstrength cold ro|ed weathering Hereinafter, a detailed description will be given in conjunction with thesteel sheet and the method thereof in the present invention, which, however, donot constitute the improper limitation on the present technical solution.
    [36] [0036] Embodiments 1~7.
    [37] [0037]as the following stages: The superstrength cold ro|ed weathering steel sheet is manufactured
    [38] [0038]elements therein as shown in Table 1; (1) smelting and controlling the weight percentage of the chemical
    [39] [0039] (2) heating and preserving the slab at temperature of 1170~1200°C;[0040] (3) hot rolling: the finish rolling temperature is more than or equal to Ar3;[0041] (4) coiling: the coiling temperature is 450~550°C;
    [42] [0042] (5) pickling;
    [43] [0043] (6) cold rolling: the cold rolling reduction rate is 50~60%;
    [44] [0044] (7)continuous annealing: the annealing temperature is 830~880°C so as to enable the complete austenization, then the steel is cooled rapidly (the cooling speed is more than 100°C/s) in high hydrogen atmosphere (the volume fraction of hydrogen therein is 60%.) so as to attain martensite structure;
    [45] [0045] (8) skin passing.
    [46] [0046]superstrength cold ro|ed weathering steel sheet in Embodiments 1~7.
    [47] [0047] Table 1 (wt%, the remainders being Fe and other unavoidableimpurities)No. C Mn Al Cu Cr Ni Ti P Embodiment1 0.08 1.8 0.04 0.35 0.45 - 0.030 0.01Embodiment2 0.10 1.7 0.04 0.3 0.5 - 0.035 0.01Embodiment3 0.14 1.4 0.03 0.25 0.5 - 0.02 0.01Embodiment4 0.15 1.2 0.04 0.3 0.55 - 0.015 0.01Embodiment 5 0.06 2.2 0.06 0.4 0.4 0.1 0.03 0.01Embodiment6 0.11 1.6 0.03 0.25 0.6 0.15 0.025 0.01Embodiment 0.16 1.0 0.02 0.20 0.45 0.2 0.03 0.01
    [48] [0048] Table 2 lists the technological parameters and mechanical properties in relation to the manufacturing of the superstrength cold ro|ed weathering steel sheet in Embodiments 1~7
    [49] [0049] Table 2Heating .and Comng Reducfüon Annealing Weld Tensile ElongationNo presemng temper ratem temperature strength strength rate b 2:' temperature ature cold rolling en ing(D) (D) (%) (D) (MPa) (MPa) (%) Embodiment 1A 1200 498 50 873 900 1043 8.4 passedEmbodiment 1B 1180 457 60 880 1009 1117 6.7 passedEmbodiment 1C 1180 546 60 854 841 1010 9.3 passedEmbodiment 1D 1170 509 55 880 931 1067 7.3 passedEmbodiment 2A 1190 550 55 859 763 1053 11 .1 passedEmbodiment 2B 1170 508 60 879 851 1061 9.6 passedEmbodiment 2C 1190 454 55 880 859 1162 9.1 passedEmbodiment 2D 1200 482 60 862 762 1020 10.2 passedEmbodiment 3A 1180 501 60 867 886 1162 8.6 passed Embodiment 3B 1190 465 60 880 970 1231 8.4 passedEmbodiment 3C 1180 534 55 871 749 1100 9.6 passedEmbodiment 3D 1190 497 55 875 776 1114 10.8 passedEmbodiment 4A 1170 495 55 880 903 1235 8.6 passedEmbodiment 4B 1170 533 60 867 729 1154 10.3 passedEmbodiment 4C 1180 514 55 872 854 1216 8.6 passedEmbodiment 4D 1180 475 60 880 960 1231 8.2 passedEmbodiment 5A 1190 523 60 878 940 1140 9.3 passedEmbodiment 5B 1180 489 60 857 852 1067 11 passedEmbodiment 5C 1190 550 60 865 861 1073 10.7 passedEmbodiment 5D 1190 509 55 871 900 1173 9.8 passedEmbodiment 6A 1200 497 60 848 825 1050 11.3 passedEmbodiment 6B 1180 514 55 873 930 1211 8.9 passedEmbodiment 6C 1170 506 55 864 900 1150 9.3 passedEmbodiment 6D 1200 550 60 877 951 1198 9.6 passedEmbodiment 7A 1200 526 55 880 856 1209 9.5 passedEmbodiment 7B 1180 495 60 864 790 1120 11.5 passedEmbodiment 7C 1200 487 55 858 807 1132 10.6 passedEmbodimenwo 1180 550 55 877 930 1220 9.4 passed[0050] The compositions of the steel in Embodiments 1~7 in Table 2 corresponds to that in Table 1, that is, Embodiments 1A, 1B, 1C, and 1D all usethe compositions in Embodiment 1 shown in Table 1.
    [51] [0051]in the present invention has a yield strength of more than 700Mpa, up to the Seen from Table 2, the superstrength cold rolled weathering steel sheet maximum of 1009 Mpa; a tensile strength of more than 1000Mpa, up to themaximum of 1235 Mpa; an elongation rate of more than 6%, up to the maximumof 11.5%; in the meantime, it has passed the 2a bending test. The steel sheet isadapted for manufacturing the parts like automobile structures and containerpanels with high strength and light weight, and the main forming processes of thefinished steel sheets are rolling and simple folding, thereby having a broad application prospects _ 11
    [52] [0052] lt should be noted that the listed above are just some detailedembodiments of the present invention. Obviously, the present invention is limitedto the above embodiments, and various modifications may be made with them. lfthe skilled in the art conducts directly or associates any variations, all of them should fall within the protection scope of the claims.
    权利要求:
    Claims (14)
    [1] 1.A superstrength cold rolled weathering steel sheet, wherein the weightpercentage of the chemical elements thereof are as follows: C: 0.05~0.16 wt%; Mn: 1.00~2.20 wt%; Al: 0.02~0.06 wt%; Cu: 0.20~0.40 wt%; Cr: 0.40~0.60 wt%; Ti: 0.015~0.035 wt%; P: less than or equal to 0.03 wt%; C+Mn/16 is more than 0.19 wt% and less than 0.23 wt%; and optionallyNi: less than or equal to 0.20 wt%; the remainders thereof being Fe and other unavoidable impurities.
    [2] 2.The superstrength cold rolled weathering steel sheet according to Claim 1,wherein the weight percentage of the chemical elements thereof are further definedas follows: C: 0.07~0.15 wt%; Mn: 1.30~2.00 wt%; Al: 0.02~0.04 wt%; Cu: 0.25~0.35 wt%; P: less than or equal to 0.§g15 wt%.
    [3] 3.The superstrength cold rolled weathering steel sheet according to Claim 1,wherein the microstructure thereof is martensite, the volume fraction of which ismore than 95%.
    [4] 4.The superstrength cold rolled weathering steel sheet according to Claim 1,wherein the thickness thereof is 0.8~1.5mm.
    [5] 5.A container panel manufactured with said superstrength cold rolledweathering steel sheet according to any one of Claims 1 to 4. 13
    [6] 6.An automobile structural plate manufactured with said superstrength coldrolled weathering steel sheet according to any one of Claims 1 to 4.
    [7] 7.A method of manufacturing said superstrength cold rolled weathering steelsheet according to any one of Claims 1 to 4, wherein it comprises the following stages: smelting, heating and preservation, hotrolling, coiling,pickling, coldrolling, w continuous annealing, skin passing; wherein, in the continuous annealing process,the annealing temperature is 830~880°C so as to enable the complete austenization,then the steel is cooled rapidly in an high hydrogen atmosphere so as to attainmartensite structure.
    [8] 8.The method of manufacturing said superstrength cold rolled weathering steelsheet according to Claim 7, wherein in the stage of continuous annealing, thevolume fraction of hydrogen in the high hydrogen atmosphere is 60%.
    [9] 9.The method of manufacturing said superstrength cold rolled weathering steelsheet according to Claim 7, wherein in the stage of continuous annealing, thecooling speed of the rapid cooling is more than 100°C/s.
    [10] 10. The method of manufacturing said superstrength cold rolledweathering steel sheet according to Claim 7, wherein in the stage of continuousannealing, the annealing temperature is 850~880°C.
    [11] 11. The method of manufacturing said superstrength cold rolledweathering steel sheet according to Claim 7, wherein in the stages of heating and Qrsssrvêtiøn. f. thsêlërb. i hsêtsd. 11011. Prsësrvsflilêt .117Qf1 211911121. - - - - - - - - - - - - - - - - - - - e
    [12] 12. The method of manufacturing said superstrength cold rolledweathering steel sheet according to Claim 7, wherein in the stage of hot rolling, thefinish rolling temperature is more than or equal to Ar3.
    [13] 13. The method of manufacturing said superstrength cold rolledweathering steel sheet according to Claim 7, wherein in the stage of coiling, thecoiling temperature is 450~550°C. 14
    [14] 14. The method of manufacturing said superstrength cold rolledweathering steel sheet according to Ciaim 7, wherein in the stage of cold rolling, thereduction rate therein is 50~60%.
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    CN201310190897.4A|CN103266274B|2013-05-22|2013-05-22|A kind of superhigh intensity cold rolling weather resisting steel plate and manufacture method thereof|
    PCT/CN2014/074091|WO2014187193A1|2013-05-22|2014-03-26|Ultra-high strength cold-rolled corten steel plate and method of fabricating same|
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