LEAN DUPLEX STAINLESS STEEL EXCELLENT IN CORROSION RESISTANCE AND TOUGHNESS OF WELD HEAT AFFECTED ZONE
    2.
    发明申请
    LEAN DUPLEX STAINLESS STEEL EXCELLENT IN CORROSION RESISTANCE AND TOUGHNESS OF WELD HEAT AFFECTED ZONE 有权
    不锈钢不锈钢耐腐蚀性和焊接热影响区韧性好

    公开(公告)号:US20110097234A1

    公开(公告)日:2011-04-28

    申请号:US12736255

    申请日:2009-03-26

    摘要: The present invention provides a lean duplex stainless steel able to suppress the drop in corrosion resistance and toughness of a weld heat affected zone and is characterized by containing, by mass %, C: 0.06% or less, Si: 0.1 to 1.5%, Mn: 2.0 to 4.0%, P: 0.05% or less, S: 0.005% or less, Cr: 19.0 to 23.0%, Ni: 1.0 to 4.0%, Mo: 1.0% or less, Cu: 0.1 to 3.0%, V: 0.05 to 0.5%, Al: 0.003 to 0.050%, 0: 0.007% or less, N: 0.10 to 0.25%, and Ti: 0.05% or less, having a balance of Fe and unavoidable impurities, having an Md30 value expressed by formula (1) of 80 or less, having an Ni-bal expressed by formula (2) of −8 to −4, having a relationship between the Ni-bal and the N content satisfying formula (3), having an austenite phase area percentage of 40 to 70%, and having a 2×Ni+Cu of 3.5 or more: Md30=551−462×(C+N)−9.2×Si−8.1×Mn−29×(Ni+Cu)−13.7×Cr−18.5×Mo−68×Nb   (1) Ni-bal=(Ni+0.5Mn+0.5Cu+30C+30N)−1.1(Cr+1.5Si+Mo+W)+8.2   (2) N(%)≦0.37+0.03×(Ni-bal)   (3)

    摘要翻译: 本发明提供能够抑制焊接热影响区的耐腐蚀性和韧性降低的双相不锈钢,其特征在于,以质量%计含有C:0.06%以下,Si:0.1〜1.5%,Mn :2.0〜4.0%,P:0.05%以下,S:0.005%以下,Cr:19.0〜23.0%,Ni:1.0〜4.0%,Mo:1.0%以下,Cu:0.1〜3.0% 0.05〜0.5%,Al:0.003〜0.050%,0:0.007%以下,N:0.10〜0.25%,Ti:0.05%以下,余量为Fe和不可避免的杂质,Md30值为式 (1)为80以下,具有由式(2)表示的Ni-bal为-8〜-4,具有Ni-bal与满足式(3)的N含量之间的关系,具有奥氏体相面积百分比 40〜70%,2×Ni + Cu为3.5以上:Md30 = 551-462×(C + N)-9.2×Si-8.1×Mn-29×(Ni + Cu)-13.7×Cr -18.5×Mo-68×Nb(1)Ni-bal =(Ni + 0.5Mn + 0.5Cu + 30C + 30N)-1.1(Cr + 1.5Si + Mo + W)+8.2(2)N(%)& ; 0.37 + 0.03×(Ni-bal) (3)