Martensitic heat-resistant steel
    1.
    发明授权
    Martensitic heat-resistant steel 失效
    马氏体耐热钢

    公开(公告)号:US4414024A

    公开(公告)日:1983-11-08

    申请号:US411802

    申请日:1982-08-26

    IPC分类号: C22C38/00 C22C38/22

    CPC分类号: C22C38/22

    摘要: This invention discloses martensitic heat-resistant steel consisting essentially of 0.1 to 0.2 wt. % of C, up to 0.4 wt. % of Si, up to 1 wt. % of Mn, 9 to 12 wt. % of Cr, 0.1 to 0.3 wt. % of V, 0.02 to 0.25 wt. % of Nb, 0.03 to 0.1 wt. % of N, up to 1 wt. % of Ni, molybdenum and tungsten in amounts falling within the range encompassed by lines connecting a point A (0.7 wt. % of Mo and 1.1 wt. % of W), a point B (1.2 wt. % of Mo and 1.1 wt. % of W), a point C (1.6 wt. % of Mo and 0.33 wt. % of W) and a point D (0.7 wt. % of Mo and 0.33 and wt. % of W) as shown in FIG. 1 and the balance of iron.The martensitic heat-resistant steel in accordance with the present invention is suitable for use in steam turbine blades and rotor shafts.

    摘要翻译: 本发明公开了马氏体耐热钢,其基本上由0.1〜0.2重量% C%,高达0.4wt。 %的Si,高达1wt。 %的Mn,9〜12wt。 Cr%,0.1〜0.3wt。 V%,0.02〜0.25wt。 %的Nb,0.03〜0.1wt。 N%,至多1重量% 位于连接点A(0.7重量%的Mo和1.1重量%的W)的线所包围的范围内的Ni,钼和钨的%,点B(1.2重量%的Mo和1.1重量% W的百分比),点C(1.6重量%的Mo和0.33重量%的W)和点D(0.7重量%的Mo,0.33和W的重量百分比)如图1所示。 1和铁的余量。 根据本发明的马氏体耐热钢适用于汽轮机叶片和转子轴。

    Heat resisting steel
    2.
    发明授权
    Heat resisting steel 失效
    耐热钢

    公开(公告)号:US4585478A

    公开(公告)日:1986-04-29

    申请号:US607288

    申请日:1984-05-04

    CPC分类号: C22C38/32

    摘要: A heat resisting steel suitable for use as the materials of steam turbine casings of steam turbines for thermal power generation. The steel has a composition consisting essentially of 0.05 to 0.2 wt % of C, 0.5 to 2.0 wt % of Cr, 0.5 to 2.0 wt % of Mo, 0.05 to 0.5 wt % of V, 0.002 to 0.1 wt % of Al, 0.0002 to 0.0030 wt % of B and the balance substantially Fe and inevitable impurities, wherein the sum of X and Al as obtained from the following formulae is not greater than 2920:X=10P+5Sb+4Sn+AsAl=xAl(x being a coefficient obtained from FIG. 4)where, P,Sb,Sn and As represent the contents of P,Sb,Sn and As contained as said inevitable impurities in terms of ppm, while Al represents the Al content in terms of ppm. This heat resisting steel exhibits a large resistance to cracking in stress relief annealing after welding, as well as a high creep rupture strength at high temperature, and shows only a low crack developing speed.

    摘要翻译: 适用于火力发电用蒸汽轮机的汽轮机壳体材料的耐热钢。 该钢具有以下组成的组成:C:0.05〜0.2重量%,Cr:0.5〜2.0重量%,Mo:0.5〜2.0重量%,V:0.05〜0.5重量%,Al:0.002〜0.1重量% 0.0030重量%的B,余量基本上为Fe和不可避免的杂质,其中由下列公式得到的<上升& X和& upbar&A的总和不大于2920:X = 10P + 5Sb + 4Sn + As Al = xAl 从图4得到的系数)其中,P,Sb,Sn和As表示作为所述不可避免的杂质含有的P,Sb,Sn和As的含量,以ppm表示,而Al表示以ppm表示的Al含量。 该耐热钢在焊接后的抗应力消除退火中表现出较大的耐龟裂性,并且在高温下具有高的蠕变断裂强度,并且仅显示出低的裂纹显影速度。