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    • 5. 发明授权
    • Heat resisting steel
    • 耐热钢
    • US4585478A
    • 1986-04-29
    • US607288
    • 1984-05-04
    • Takatoshi YoshiokaSeishin KiriharaMasao SigaMitsuo KuriyamaTakehiko YoshidaTakanori Murohoshi
    • Takatoshi YoshiokaSeishin KiriharaMasao SigaMitsuo KuriyamaTakehiko YoshidaTakanori Murohoshi
    • C22C38/00C22C38/32C22C38/54F01D25/00F01D25/24C22C38/06C22C38/28C22C38/50
    • C22C38/32
    • 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.
    • 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。
    • 9. 发明授权
    • Boiler tube
    • 锅炉管
    • US4505232A
    • 1985-03-19
    • US593931
    • 1984-03-27
    • Kenichi UsamiSeishin KiriharaHiroyuki DoiChoichi AsanoMasayuki SukekawaYasuhide Sakaguchi
    • Kenichi UsamiSeishin KiriharaHiroyuki DoiChoichi AsanoMasayuki SukekawaYasuhide Sakaguchi
    • B32B15/01C22C38/00C22C38/54F22B37/04F22B37/06
    • B32B15/01F22B37/04Y10S122/13Y10S165/905Y10T428/12965
    • A boiler tube having a double-tube structure constituted by an inner tube and an outer tube integrated with each other. The inner tube is made of an alloy consisting essentially of, by weight, 0.02 to 0.15% of C, 0.5 to 3.5% of Si, not greater than 2% of Mn, 25 to 40% of Ni, 20.5 to 27% of Cr, 0.5 to 3% of Mo, not greater than 1% of Nb and the balance Fe and having a substantially fully austenite structure. The outer tube is made of an alloy consisting essentially of, by weight, 0.02 to 0.2% of C, not greater than 3.5% of Si, not greater than 2% of Mn, 33 to 45% of Ni, 30 to 40% of Cr and the balance Fe and having a substantially fully austenite structure. The inner tube made of the alloy having the composition specified above exhibits a high resistance to steam oxidation without any reduction in high-temperature strength even at elevated steam temperature, while the outer tube made of the alloy having the composition specified above exhibits a superior resistance to corrosion by coal combustion gas.
    • 一种具有由内管和彼此一体化的外管构成的双管结构的锅炉管。 内管由以下组成的合金制成,该合金主要由C:0.02〜0.15%,Si:0.5〜3.5%,Mn:2%以下,Ni:25〜40%,Cr:20.5〜27% ,0.5〜3%的Mo,不大于1%的Nb,余量为Fe,并具有基本上完全奥氏体的结构。 外管由以下组成的合金制成,该合金主要由以下组成:C:0.02〜0.2%,Si:3.5%以下,Mn:2%以下,Ni:33〜45%,Ni:30〜40% Cr和余量Fe并具有基本上完全奥氏体的结构。 由具有上述组成的合金制成的内管即使在升高的蒸汽温度下也具有高的耐蒸汽氧化性,而不会降低高温强度,而由具有上述组成的合金制成的外管显示出优异的电阻 由煤燃烧气体腐蚀。