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    AUSTENITIC STEEL HAVING SUPERIOR MACHINABILITY AND CRYOGENIC TEMPERATURE TOUGHNESS IN WELD HEAT AFFECTED ZONES THEREOF AND METHOD FOR MANUFACTURING SAME
    1.
    发明公开
    AUSTENITIC STEEL HAVING SUPERIOR MACHINABILITY AND CRYOGENIC TEMPERATURE TOUGHNESS IN WELD HEAT AFFECTED ZONES THEREOF AND METHOD FOR MANUFACTURING SAME 审中-公开
    随着焊接热影响区域，以用于生产杰出切削加工性和低温韧性和工艺奥氏体钢

    公开(公告)号：EP2799571A1

    公开(公告)日：2014-11-05

    申请号：EP12862659.5

    申请日：2012-12-27

    申请人： Posco

    发明人： LEE, Soon-Gi ,  CHOI, Jong-Kyo ,  PARK, Young-Hwan ,  NOH, Hee-Goon ,  CHO, Hyun-Kwan ,  SUH, In-Shik ,  PARK, In-Gyu ,  LEE, Hong-Ju

    IPC分类号： C22C38/00 ,  C22C38/38 ,  B23K31/02 ,  C21D9/50

    CPC分类号： C21D9/505 ,  B23K31/02 ,  B23K35/3073 ,  B23K2201/00 ,  C21D6/005 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/04 ,  C22C38/20 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60

    摘要： Provided are austenitic steel having superior machinability and cryogenic temperature toughness in weld heat affected zones thereof and a method for manufacturing the same, the austenitic steel comprising, in weight %, 15 to 35% of manganese (Mn), carbon(C) that satisfies 23.6C+Mn ≥ 28 and 33.5C-Mn ≤ 23, 5% or lower (but not 0%) of copper (Cu), chrome (Cr) that satisfies 28.5C+4.4Cr ≤ 57 (but not 0%), the remainder being Fe and other inevitable impurities, the Charpy impact value of the weld heat affected zones at -196°C being 41J or higher. According to the present invention, austenitic steel having superior machinability and cryogenic temperature toughness in weld heat affected zones thereof is provided in which the cryogenic steel is obtained in an inexpensive manner, a stable austenite phase can be formed at a low temperature and the generation of carbide can be effectively inhibited.

    摘要翻译： 本发明提供具有优异的机械加工性和在其焊接热影响区的低温韧性和用于制造其的方法奥氏体钢，奥氏体钢，其包括，以重量％计，15至35％的锰（Mn），碳（C）那样SATIS外资企业 23.6C +锰‰¥28和33.5C-Mn系‰¤23，铜的5％或更低（但不为0％）（铜），铬（Cr）的确实SATIS外资企业28.5C + 4.4Cr‰¤57（但不为0 ％），其余为Fe和其它不可避免的杂质，在196℃时的焊接热影响区为41J或更高的却贝冲击值。 。根据本发明，具有在其被提供焊接热影响区，其中所述低温钢在廉价的方式获得优异的机械加工性和低温韧性的奥氏体钢，具有稳定奥氏体相可以在低温下形成，并且产生的 碳化物可以有效地抑制。

    HIGH-STRENGTH STEEL MATERIAL HAVING OUTSTANDING ULTRA-LOW-TEMPERATURE TOUGHNESS AND A PRODUCTION METHOD THEREFOR
    2.
    发明公开
    HIGH-STRENGTH STEEL MATERIAL HAVING OUTSTANDING ULTRA-LOW-TEMPERATURE TOUGHNESS AND A PRODUCTION METHOD THEREFOR 有权
    具有优良的耐用于生产超低温和方法高强度钢材料

    公开(公告)号：EP2641987A2

    公开(公告)日：2013-09-25

    申请号：EP11841040.6

    申请日：2011-11-21

    申请人： Posco

    发明人： UM, Kyung-Keun ,  CHOI, Jong-Kyo ,  JANG, Woo-Kil ,  NOH, Hee-Goon ,  CHO, Hyun-Kwan

    IPC分类号： C22C38/00 ,  C21D8/02 ,  C22C38/04 ,  C22C38/06

    CPC分类号： C21D8/005 ,  C21D6/005 ,  C21D8/0226 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/44 ,  C22C38/58

    摘要： The present invention provides steel containing manganese and nickel that is used as a structural material for a cryogenic storage container for liquefied natural gas (LNG) or the like, and a manufacturing method thereof; and more particularly, to steel having good cryogenic temperature toughness and also high strength by adding low-cost Mn instead of relatively expensive Ni at an optimized ratio, refining a microstructure through controlled rolling and cooling, and precipitating retained austenite through tempering, and a manufacturing method of the steel. To achieve the object, the technical feature of the present invention is a method of manufacturing high-strength steel with cryogenic temperature toughness. In the method, a steel slab is heated to a temperature within a range of 1,000 to 1,250°C, wherein the steel slab includes, by weight: 0.01-0.06% of carbon (C), 2.0-8.0% of manganese (Mn), 0.01-6.0% of nickel (Ni), 0.02-0.6% of molybdenum (Mo), 0.03-0.5% of silicon (Si), 0.003-0.05% of aluminum (Al), 0.0015-0.01% of nitrogen (N), 0.02% or less of phosphorous (P), 0.01% or less of sulfur (S), with a remainder of iron (Fe) and other unavoidable impurities. Then, the heated slab is finish-rolled at a temperature of 950°C or less at a rolling reduction rate of 40% or more. The rolled steel is cooled to a temperature of 400°C or less at a cooling rate of 2°C/s or more. Thereafter, the steel is tempered for 0.5-4 hours to a temperature within a range of 550 to 650°C after the cooling.

    摘要翻译： 本发明提供了含钢锰和镍没有被用作用于液化天然气（LNG）或类似物，以及它们的制造方法的低温存储容器的结构材料; 更具体而言，对钢具有良好的低温韧性，因此高强度通过在上优化的比率增加低成本MN代替相对昂贵的Ni，提炼通过控制轧制和冷却的显微组织，沉淀通过回火残留奥氏体，并且制造 钢的方法。 为了实现上述目的，本发明的技术特征是制造高强度钢的低温韧性的方法。 在该方法中，一钢坯被加热到〜1250℃的范围的1000内的温度，worin钢坯包括，按重量计：0时01分至12：碳06％（C），锰的2.0-8.0％（Mn）的 ，镍0.01-6.0％镍（Ni），氮钼（Mo）的0.02-0.6％，硅0.03-0.5％（Si）的，铝的0.003-0.05重量％（Al）等的0.0015-0.01％（N） ，0：02％或更少的磷（P），0：01％或更少的硫（S）的，具有铁（Fe）和其他不可避免的杂质的剩余部分。 然后，将加热后的钢坯是精轧在950℃或更低的温度下以40％以上的轧制率。 轧制钢以2℃/ s以上的冷却速度冷却至400℃或更低的温度。 那里之后，将钢冷却后回火0.5-4小时的温度的范围550内，以650℃。

    AUSTENITE STEEL MATERIAL HAVING SUPERIOR DUCTILITY
    3.
    发明公开
    AUSTENITE STEEL MATERIAL HAVING SUPERIOR DUCTILITY 有权
    奥氏体钢材具有优异的延展性

    公开(公告)号：EP2520684A2

    公开(公告)日：2012-11-07

    申请号：EP10841225.5

    申请日：2010-12-28

    申请人： Posco

    发明人： LEE, Soon-Gi ,  CHOI, Jong-Kyo ,  CHO, Hyun-Kwan ,  NOH, Hee-Goon

    IPC分类号： C22C38/04 ,  C22C38/18

    CPC分类号： C22C38/04 ,  C22C38/16 ,  C22C38/20 ,  C22C38/38

    摘要： Provided is an austenite steel having excellent ductility including 8 wt% to 15 wt% of manganese (Mn), 3 wt% or less (excluding 0 wt%) of copper (Cu), a content of carbon (C) satisfying relationships of 33.5C + Mn ≥ 25 and 33.5C - Mn ≤ 23, and iron (Fe) as well as unavoidable impurities as a remainder. According to an aspect of the present invention, austenite is stabilized and generation of carbides in a network form at austenite grain boundaries is inhibited by adding copper (Cu) favorable to inhibition of carbide formation with respect to manganese and appropriately controlling contents of carbon and manganese, and thus, high economic efficiency may also be achieved while ductility and wear resistance are improved.

    摘要翻译： 本发明提供一种具有优异的延展性的奥氏体钢，所述奥氏体钢包含锰（Mn）8wt％〜15wt％，铜（Cu）3wt％以下（不含0wt％），碳含量（C）满足33.5 C +Mn≥25和33.5℃-Mn≤23，铁（Fe）以及不可避免的杂质作为余量。 根据本发明的一个方面，通过添加有利于抑制对于锰的碳化物形成的铜（Cu）并且适当地控制碳和锰的含量来抑制奥氏体并且抑制在奥氏体晶界处的网状碳化物的生成 因此，在提高延展性和耐磨性的同时也可以实现高经济效率。