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    • 2. 发明申请
    • Duplex stainless steel alloy for use in seawater applications
    • 用于海水应用的双相不锈钢合金
    • US20070089810A1
    • 2007-04-26
    • US10547572
    • 2004-02-19
    • Ann SundstromPasi Kangas
    • Ann SundstromPasi Kangas
    • C22C38/44
    • C22C38/44C22C38/001C22C38/04C22C38/52
    • The present invention relates to a stainless steel alloy, more precisely a duplex stainless steel alloy having ferritic-austenitic matrix and having high corrosion resistance in combination with good structural stability and hot-workability, in particular a duplex stainless steel having a ferritic content of 40-65% and a well-balanced composition, which gives the material corrosion properties making it more suitable for use in chloride-containing environments than what has been found possible previously. The material according to the present invention has, in view of the high alloy content thereof, extraordinarily good workability, in particular hot-workability, and should thereby be very suitable to be used for, for instance, the manufacture of bars: pipes, such as welded and weld less pipes, weld material, construction parts, such as, for instance, flanges and couplings. These objects are met according to the present invention with duplex stainless alloy, which contain (in % by weight): C more than 0 and up to max 0.03 Si up to max 0.5 Mo 0-3.0 20 Cr 24.0-30.0 Ni 4.9-10.0 Mo 3.0-5.0 N 0.28-0.5 B 0-0.0030 25 S up to max 0.010 Co 0-3.5 W 0-3.0% Cu 0-2.0 Ru 0-0.3 3 0 Al 0-0.03 Ca 0-0.010%, balance Fe together with inevitable contaminations.
    • 本发明涉及一种不锈钢合金,更具体地说是一种具有铁素体 - 奥氏体系的双相不锈钢合金,具有良好的耐腐蚀性和良好的结构稳定性和热加工性,特别是铁素体含量为40的双相不锈钢 -65%和均衡的组合物,这提供了材料腐蚀性能,使其更适合在含氯化物环境中使用,而不是以前发现的。 鉴于其高合金含量,鉴于其高合金含量,具有非常好的可加工性,特别是热加工性,因此非常适合用于例如制造棒:管,如 作为焊接和焊接较少的管道,焊接材料,建筑部件,例如法兰和联接器。 根据本发明,符合本发明的这些目的具有双重不锈钢合金,其含有(以重量%计):C大于0和高达最大0.03Si直到最大0.5 Mo 0-3.0 20 Cr 24.0-30.0 Ni 4.9-10.0 Mo 3.0-5.0 N 0.28-0.5 B 0-0.0030 25 S最大0.010 Co 0-3.5 W 0-3.0%Cu 0-2.0 Ru 0-0.3 3 0 Al 0-0.03 Ca 0-0.010%,余量为Fe 有不可避免的污染。
    • 7. 发明授权
    • Stainless steel for use in seawater applications
    • 用于海水应用的不锈钢
    • US06451133B1
    • 2002-09-17
    • US09807931
    • 2001-06-29
    • Johan FrodighPasi Kangas
    • Johan FrodighPasi Kangas
    • C22C3822
    • C22C38/58C22C38/44
    • A duplex ferritic-austenitic stainless steel alloy provided for seawater applications includes, in weight %: C maximum 0.05; Si maximum 0.8; Mn 0.03-4; Cr 28-35; Ni 3-10%, Mo 1.0-4.0; N 0.2-0.6; Cu maximum 1.0; W maximum 2.0; S maximum 0.010; Ce maximum 0.2; and the balance Fe together with normally occurring impurities and additives, wherein the ferritic content is 30-70 volume %, the alloy composition has a PRE-value higher than 42, and the PRE-value is at least 40 in both the ferritic and austenitic phases. A method is also provided which includes: providing a duplex ferritic-austenitic stainless steel alloy with the above-noted composition, forming a component with the alloy, and contacting the component with seawater. In preferred embodiments, the component comprises at least one of tubes, bars, heavy castings, forging, plates, wire or strip.
    • 提供用于海水应用的双相铁素体 - 奥氏体不锈钢合金包括重量%:C最大0.05; Si最大0.8; Mn 0.03-4; Cr 28-35; Ni 3-10%,Mo 1.0-4.0; N 0.2-0.6; 铜最大1.0; W最大2.0; S最大0.010; Ce最大0.2; 余量为Fe,通常存在的杂质和添加剂,其中铁素体含量为30-70体积%,合金组成的PRE值高于42,PRE值在铁素体和奥氏体中都至少为40 阶段 还提供了一种方法,其包括:提供具有上述组成的双相铁素体 - 奥氏体不锈钢合金,与合金形成组分,并使组分与海水接触。 在优选实施例中,该部件包括管,棒,重铸件,锻造,板,线或带中的至少一个。