EP1486580B9 - Tole d'acier resistante a la corrosion atmospherique, presentant une resistance elevee et une excellente formabilite par pliage, et procede de production de ladite tole d'acier - Google Patents

Tole d'acier resistante a la corrosion atmospherique, presentant une resistance elevee et une excellente formabilite par pliage, et procede de production de ladite tole d'acier Download PDF

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Publication number
EP1486580B9
EP1486580B9 EP20030742886 EP03742886A EP1486580B9 EP 1486580 B9 EP1486580 B9 EP 1486580B9 EP 20030742886 EP20030742886 EP 20030742886 EP 03742886 A EP03742886 A EP 03742886A EP 1486580 B9 EP1486580 B9 EP 1486580B9
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Prior art keywords
steel material
strength
high strength
weather
amount
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German (de)
English (en)
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EP1486580B2 (fr
EP1486580A1 (fr
EP1486580B1 (fr
EP1486580A4 (fr
Inventor
Takaaki NIPPON STEEL CORPORATION NAKAMURA
Minoru NIPPON STEEL CORPORATION KODERA
Yasuhiro NIPPON STEEL CORPORATION MIYATANI
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

  • the present invention relates to a steel material, used for railcars and containers for land or marine transportation, required to have strength, workability after blasting or the like and weather resistance, and a method for producing the steel material.
  • a material having the properties of low weight, long life and weather resistance has heretofore been desired for containers and thus a material produced using aluminum has mainly been used for such applications.
  • a material has the disadvantages of a high cost and low strength and therefore a steel material having both high strength and weather resistance has been sought.
  • As a conventional weather-resistant steel material there is a highly-weather-resistant rolled steel material of the 50 kgf/mm 2 (490 MPa) class in tensile strength as stipulated in JIS G3125. With regard to a steel material having a higher strength than that, Japanese Unexamined Patent Publication No. H3-2321 discloses a method for producing a weather-resistant steel sheet having a tensile strength of 60 kgf/mm 2 or higher and good cold-workability.
  • JP-A-63-72853 discloses that a life-span increase can be realized by adding Nb, Ti, V and B to a high-P steel.
  • the object of the present invention is, by solving the aforementioned problems, to provide: a steel material withstanding bending work after blasting or the like and having weather resistance while securing an ultra-high strength of 700 MPa or higher in yield strength; and a method for producing the steel material.
  • JP-A-2000-63981 discloses a weather resistant steel showing blackish color tone from initial stage of rusting and excellent in external appearance and stability of color tone, and further discloses a steel comprising, by weight, C: 0.01-0.15%, Si: 0.01-1.0%, Mn: 0.8-3.0%, Cu: 0.05-1.0%, Ni: 0.25-5.0%, Al: more than 0.1% to 0.2% with the balance consisting of Fe and inevitable impurities satisfying Mn + Ni ⁇ 1.8, and further optionally comprising one or more of Cr: 25-5.0%, Mo: 0.25-1.0%, P: 0.03-1.0%, Nb: 0.01-0.05%, V: 0.01-0.1%, Ti: 0.005-0.05%, Zr: 0.01-0.1%.
  • the means for attaining the above object according to the present invention is;
  • the present inventors investigated and studied methods for producing steel sheets comprising various kinds of steels in order to solve the aforementioned problems and thus established the present invention.
  • the present invention is hereunder explained in detail.
  • the material is brittle because of the addition of P and therefore the workability thereof is poor.
  • the strength of a steel material increases, the elongation thereof lowers. Therefore, the workability of a P-added material further lowers and moreover, as the object material is subjected to bending work after shot blasting or the like, the material is very susceptible to bend cracking.
  • weld cracking is likely to occur when such a steel material is fabricated into a container by welding.
  • weather resistance can be secured by the use of Ni instead of P
  • bendability can be secured by lowering C to improve workability, reducing the addition of P to the utmost, and reducing S to the utmost to suppress the formation of MnS that adversely affects bendability
  • the adjustment of strength can be attained by utilizing a precipitation effect caused by combining one or more of Ti, Nb, V and B.
  • Fig. 1 shows the effect of an Ni amount on a corrosion loss in comparison with the effect of a P amount. It has been found that, as an Ni amount increases, a corrosion loss decreases and an effect similar to the case of P addition is obtained.
  • Ni in contrast with P, does not segregate during the casting of a slab, slab cracking does not matter, and also a yield is good. Furthermore, Ni causes no problem in workability and weldability and therefore bending work after shot blasting or the like and weld cracking do not matter. Accordingly, Ni is an element very suitable for the production of a weather-resistant high strength steel sheet excellent in bendability. With regard to weather resistance, Ni exhibits the effect by the joint use with Cu and Cr.
  • C is exploited as an element for enhancing strength. It is utilized not only as a solid solution strengthening element but also, by combining with Ti and Nb and forming carbide, as a precipitation strengthening element.
  • C when C is used excessively, workability deteriorates. Since workability lowers as the strength of a steel material increases, a low C amount is desirable.
  • the reason why the lower limit of a C amount is set at 0.05% is that, when it is lower than that amount, a yield strength of 700 MPa or higher is hardly secured.
  • the reason why a C amount is limited to 0.15% or lower is to prevent cracking caused by bending work.
  • Si is an element that is likely to form fayalite (2reO-SiO 2 ) on the surface of a steel sheet, make fine Fe 2 O 3 remain on the most surface, and generate red scale. When red scale is created on the surface of a steel sheet, mottling appears and the product is not accepted by users. In order to avoid the problem, the upper limit of an Si amount is set at 0.5%.
  • Mn is an element necessary for enhancing the strength of a steel material.
  • an Mn amount is less than 0.5%, a high strength steel material is hardly produced.
  • Mn is added in excess of 2.0%, workability is hardly secured.
  • an Mn amount is limited in the range from 0.5 to 2.0%.
  • P is an element effective in the enhancement of strength and beneficial to the improvement of weather resistance and has heretofore been exploited for a weather-resistant steel material.
  • P causes slab embrittlement during the production of the steel material and also deteriorates weldability.
  • P also deteriorates bendability, and therefore a P amount should be as low as possible. Accordingly, the upper limit of a P amount is set at 0.02%.
  • S forms sulfide MnS combining with Mn.
  • This sulfide is easy to deform, is elongated by rolling and is present in a steel material.
  • MnS deteriorates the bendability and workability of a steel material.
  • S should be reduced to the utmost because it raises cracking susceptibility. Therefore, the upper limit of an S amount is set at 0.005% as the commercially attainable limit.
  • Ni is an element that enhances strength and weather resistance and is also effective in the prevention of embrittlement.
  • Ni is effective in weather resistance under an environment largely influenced by salinity.
  • P that is effective in weather resistance badly affects workability and thus cannot be utilized.
  • Ni can be utilized as an element substituting for P and neither causes slab cracking nor deteriorates the workability of a steel material in contrast with P.
  • Ni must be added by 0.2% or more in order to effectively utilize the feature of weather resistance.
  • Ni is an expensive metal and moreover the effect does not improve any more even when an Ni amount exceeds 2.0%. Therefore, the upper limit of an Ni amount is set at 2.0%.
  • Containers are used for both land and marine transportation and are affected by the salinity of seawater in the case of the marine transportation and by salinity from snowmelt salt scattered in a cold region in the case of land transportation. Therefore, Ni is an element important for weather resistance. In an environment other than a saline environment, the elements Cu and Cr, which are described below, are effective and therefore the combined addition of those elements is also effective.
  • Cu is important in improving weather resistance and is an element effective in forming stable rust.
  • a Cu amount of 0.2% or more is necessary for securing the effect against a corrosive environment.
  • a Cu amount exceeds 0.5%, surface defects are likely to appear.
  • a Cu amount is limited in the range from 0.2 to 0.5%.
  • Cr is also important in improving weather resistance and is an element effective in forming stable rust.
  • a Cr amount of 0.2% or more is necessary for securing the effect against a corrosive environment. However, the effect does not improve any more even if a Cr amount exceeds 1.0%. For those reasons, a Cr amount is limited in the range from 0.2 to 1.0%.
  • a steel material having a yield strength of 700 MPa or higher is produced, the exploitation of precipitation strengthening is effective.
  • the following four elements that allow a precipitation effect to appear compensate the insufficiency of strength and the compensation can be attained by using one or more of those elements.
  • Ti forms a carbide and a nitride by combining with C and N and thus enhances the strength of a steel material. The effect appears when Ti is added by 0.03% or more and does not improve any more even if Ti is added by 0.2% or more.
  • Nb also forms a carbide and a nitride by combining with C and N and thus enhances the strength of a steel material. The effect appears when Nb is added by 0.01% or more and does not improve any more even if Nb is added by 0.07% or more.
  • V also forms a carbide and a nitride by combining with C and N and thus enhances the strength of a steel material. The effect appears when V is added by 0.01% or more and does not improve any more even if V is added by 0.07% or more.
  • B is an element that forms a carbide and a nitride and is effective in enhancing hardenability and strength. The effect appears when B is added by 0.0005% or more and the effect does not improve any more even if B is added by 0.0050% or more.
  • the purpose of limiting a reheating temperature to 1,200°C or higher is to dissolve carbide and nitride at the stage of a slab in order to make use of the precipitation effect of Ti, Nb, V and B, and by so doing to form fine precipitates during the production of a steel sheet so that the precipitation effect may be fully utilized.
  • a rolling finish temperature is limited in the range from 850°C to 950°C.
  • a coiling temperature affects the size of precipitates and the degree of precipitation effect varies in accordance with a coiling temperature.
  • a coiling temperature is limited in the range from 500°C to 650°C as an appropriate temperature range wherein the enhancement of strength is expected.
  • Weldability was judged by the existence of weld cracks after arc welding was applied.
  • salt water spray treatment was applied and, thereafter, corrosion accelerating tests, wherein wet and dry were alternately repeated, were applied, the weight of each sample was measured before the test was applied and after rust was removed after the test, and resultantly each corrosion loss was obtained.
  • a commercially available 490 MPa class Corten steel was employed and the data thereof were used as the standard, and then each sample was evaluated as X when the corrosion loss of the sample was larger than the standard and as ⁇ when the corrosion loss thereof was equal to or smaller than the standard.
  • Test Nos. 18 to 20 were the cases where, in the hot rolling process, descaling treatment was utilized in order to remove surface scale from each of the rough bars by high-pressure descaling after rough rolling and further continuous-continuous hot rolling was utilized, wherein rough bars were heated with a bar heater and jointed.
  • the material properties stipulated in the present invention were satisfied and the effects of the utilization of the above process means were obtained.
  • the bar heater was used, and resultantly the temperature of a rough bar before finish rolling was high and uniform, thus precipitation was controlled evenly, the quality deviation of the material decreased, and the deviation of elongation was reduced to 3.8% whereas the elongation deviation of a steel of this class was usually about 6%.
  • Test No. 19 was the case where a high-pressure descaling apparatus and continuous-continuous hot rolling were applied. By the adoption of the high-pressure descaling, the surface appearance of the steel material improved remarkably. In addition, by the adoption of continuous-continuous hot rolling, the shapes at the ends of a coil improved and the material yield improved up to 97% whereas the material yield was usually about 95%. Further, Test No. 20 was the case where a bar heater and continuous-continuous hot rolling were utilized. The deviation of elongation decreased to 3.2% and the material yield improved up to 98%. Table 1: Material components (mass %) Steel No.
  • a steel material according to the present invention has bendability and weather resistance simultaneously while also having a high strength.
  • the weight reduction of a steel material for a container or the like that requires weather resistance can be realized and a longer service life is also realized because of the weather resistance. Therefore, the present invention makes it possible to provide environment-friendliness by the weight reduction and economic effect by the longer service life.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)

Claims (2)

  1. Tôle d'acier hautement résistante à résistance aux intempéries, à excellente aptitude au pliage, contenant, en masse,
    C : 0,05 à 0,15 %,
    Si : 0,5 % ou moins,
    Min : 0,5 à 2,0 %,
    P : 0,02 % ou moins,
    S : 0,005 % ou moins,
    Ni : 0,2 à 2,0 %,
    Cu:0,2 à 0,5%,
    Cr: 0,2 à 1,0 %,
    Ti : 0,03 à 0,2 %, et
    optionnellement un ou plusieurs parmi
    Nb : 0,01 à 0,07 %,
    V : 0,01 à 0,07 %, et
    B : 0,0005 à 0,0050 %,
    le reste étant Fe et des impuretés inévitables, et ayant une limite d'élasticité de 700 MPa ou plus.
  2. Procédé de production d'une tôle d'acier hautement résistante à résistance aux intempéries, à excellente aptitude au pliage, ayant une limite d'élasticité de 700 MPa ou plus,
    le procédé comprenant les étapes consistant à :
    chauffer un matériau en acier contenant, en masse,
    C : 0,05 à 0,15 %,
    Si : 0,5 % ou moins,
    Mn : 0,5 à 2,0 %,
    P : 0,02 ou moins,
    S : 0,005 % ou moins,
    Ni : 0,2 à 2,0 %,
    Cu: 0,2 à 0,5%,
    Cr: 0,2 à 1,0 %,
    Ti : 0,03 à 0,2 %, et
    optionnellement un ou plusieurs parmi
    Nb : 0,01 à 0,07 %,
    V : 0,01 à 0,07 %, et
    B : 0,0005 à 0,0050 %,
    le reste étant Fe et des impuretés inévitables, à une température de 1 200 °C ou plus ;
    par la suite soumettre le matériau en acier à un laminage de finition dans la plage de températures allant de 850 °C à 950 °C ; et
    enrouler le matériau en acier laminé dans la plage de températures allant de 500 °C à 650 °C.
EP03742886.9A 2002-02-27 2003-01-24 Tole d'acier resistante a la corrosion atmospherique, presentant une resistance elevee et une excellente formabilite par pliage, et procede de production de ladite tole d'acier Expired - Lifetime EP1486580B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002050869A JP3940301B2 (ja) 2002-02-27 2002-02-27 耐曲げ性に優れるブラスト用耐候性高強度鋼板およびその製造方法
JP2002050869 2002-02-27
PCT/JP2003/000676 WO2003072841A1 (fr) 2002-02-27 2003-01-24 Tole d'acier resistante a la corrosion atmospherique, presentant une resistance elevee et une excellente formabilite par pliage, et procede de production de ladite tole d'acier

Publications (5)

Publication Number Publication Date
EP1486580A1 EP1486580A1 (fr) 2004-12-15
EP1486580A4 EP1486580A4 (fr) 2006-08-30
EP1486580B1 EP1486580B1 (fr) 2012-03-07
EP1486580B9 true EP1486580B9 (fr) 2015-04-22
EP1486580B2 EP1486580B2 (fr) 2016-09-07

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EP03742886.9A Expired - Lifetime EP1486580B2 (fr) 2002-02-27 2003-01-24 Tole d'acier resistante a la corrosion atmospherique, presentant une resistance elevee et une excellente formabilite par pliage, et procede de production de ladite tole d'acier

Country Status (6)

Country Link
EP (1) EP1486580B2 (fr)
JP (1) JP3940301B2 (fr)
CN (1) CN1297681C (fr)
ES (1) ES2381356T5 (fr)
TW (1) TWI284154B (fr)
WO (1) WO2003072841A1 (fr)

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KR100815709B1 (ko) 2006-12-12 2008-03-20 주식회사 포스코 내후성 및 가공성이 우수한 고강도 냉연강판과 그 제조방법
KR100815799B1 (ko) * 2006-12-12 2008-03-20 주식회사 포스코 내후성이 우수한 고항복비형 냉연강판
JP5380892B2 (ja) * 2007-05-29 2014-01-08 Ｊｆｅスチール株式会社 加工性に優れた耐磨耗鋼板およびその製造方法
CN100535134C (zh) * 2007-06-27 2009-09-02 攀钢集团攀枝花钢铁研究院 含铜钢加热方法及其生产的含铜钢
KR100925639B1 (ko) * 2007-12-24 2009-11-06 주식회사 포스코 내후성이 우수한 고강도 냉연강판 및 그 제조방법
CN101343713B (zh) * 2008-08-19 2010-12-22 攀钢集团研究院有限公司 高强度耐大气腐蚀热轧带钢及其生产方法
CN101921965A (zh) * 2010-08-06 2010-12-22 莱芜钢铁股份有限公司 一种低成本屈服强度700MPa级非调质处理高强耐候钢及其制造方法
CN102080191B (zh) * 2010-12-03 2012-07-11 北京科技大学 一种铌-硼复合热轧高强度集装箱钢板及其制备方法
CN102796967B (zh) * 2012-08-31 2014-04-16 济钢集团有限公司 一种800MPa经济型耐腐蚀高强度钢板
CN104313486A (zh) * 2014-11-14 2015-01-28 武汉钢铁(集团)公司 耐大气腐蚀用钢及其生产工艺
CN104593698B (zh) * 2015-01-22 2017-05-17 首钢总公司 一种高强冷轧耐候钢板的制造方法及高强冷轧耐候钢板
CN104988418A (zh) * 2015-05-26 2015-10-21 四川鸿舰重型机械制造有限责任公司 钒钛合金半自磨机耐磨衬板
CN105178813B (zh) * 2015-08-26 2017-05-31 浙江艺迅装饰设计工程有限公司 一种夹心混凝土防火门
CN105200300A (zh) * 2015-09-07 2015-12-30 宣化钢铁集团有限责任公司 一种低合金耐候角钢的生产方法
CN106435366B (zh) * 2016-11-16 2018-06-12 攀钢集团攀枝花钢铁研究院有限公司 含铌钒厚规格耐候钢及其轧制方法
CN106893950A (zh) * 2017-01-13 2017-06-27 唐山钢铁集团有限责任公司 低屈强比冷轧耐候钢及其生产方法
CN108342662B (zh) * 2018-02-23 2020-03-10 柳州钢铁股份有限公司 一种屈服强度550MPa级高强度耐候钢
CN109046582A (zh) * 2018-07-27 2018-12-21 安徽卓煌机械设备有限公司 一种低成本复合耐磨层水泥原料磨辊
CN112375966B (zh) * 2020-10-19 2022-08-09 邯郸钢铁集团有限责任公司 一种强韧性良好的集装箱板及其生产方法
CN113234988B (zh) * 2021-04-15 2022-06-10 华南理工大学 一种在线淬火生产屈服强度700MPa级耐候钢的方法及其产物
CN115821152A (zh) * 2021-09-16 2023-03-21 宝山钢铁股份有限公司 一种屈服强度350MPa级高耐蚀耐候钢及其制造方法

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JP2000319750A (ja) * 1999-05-10 2000-11-21 Kawasaki Steel Corp 溶接熱影響部靱性に優れた大入熱溶接用高張力鋼材
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JP4144123B2 (ja) * 1999-07-07 2008-09-03 Ｊｆｅスチール株式会社 母材および溶接熱影響部靱性に優れた非調質高張力鋼材
JP4206642B2 (ja) * 2000-02-23 2009-01-14 Ｊｆｅスチール株式会社 歪時効硬化特性に優れた高張力熱延鋼板およびその製造方法
KR100371960B1 (ko) * 2000-09-29 2003-02-14 주식회사 포스코 60킬로그램급 인장강도를 갖는 고내후성 및 고가공성열연강판 및 그 제조방법

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ES2381356T5 (es) 2017-04-05
EP1486580B2 (fr) 2016-09-07
EP1486580A1 (fr) 2004-12-15
WO2003072841A1 (fr) 2003-09-04
CN1297681C (zh) 2007-01-31
JP2003253382A (ja) 2003-09-10
ES2381356T3 (es) 2012-05-25
EP1486580B1 (fr) 2012-03-07
EP1486580A4 (fr) 2006-08-30
JP3940301B2 (ja) 2007-07-04
TW200303367A (en) 2003-09-01
CN1639371A (zh) 2005-07-13
TWI284154B (en) 2007-07-21

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