Low Mn-low Cr ferritic heat resistant steel excellent in strength at
elevated temperatures
    76.
    发明授权
    Low Mn-low Cr ferritic heat resistant steel excellent in strength at elevated temperatures 失效
    低Mn低Cr铁素体耐热钢,高温强度优良

    公开(公告)号:US5746843A

    公开(公告)日:1998-05-05

    申请号:US799041

    申请日:1997-02-10

    摘要: A low Mn-low Cr ferritic heat resistant steel consisting essentially of, in weight %: 0.02-0.20% C, up to 0.7% Si, less than 0.1% Mn, up to 0.8% Ni, 0.8-3.5% Cr, 0.01-3.0% W, 0.1-0.5% V, 0.01-0.20% Nb, 0.001-0.05% Al, 0.0005-0.05% Mg, 0.0005-0.01% B, less than 0.05% N, up to 0.03% P, up to 0.015% S, 0.001-0.05% Ti and the balance Fe and incidental impurities, wherein the B content is defined so as to satisfy the following formula (14/11)B>N-N(V/51)/{(C/12)+(N/14)}-N(Nb/93)/{(C/12)+(N/14)}-N(Ti/48)/{C/12)+(N/14)}. The steel can further contain optionally 0.01-1.5% Mo, and/or one or more elements selected from the group consisting of 0.01-0.2% La, 0.01-0.2% Ce, 0.01-0.2% Y, 0.01-0.2% Ca, 0.01-0.2% Ta and 0.01-0.2% Zr. The steel can be used in place of the austenitic steels or high Cr ferritic steels, since it has remarkably improved toughness, workability and weldability, and excellent creep properties at elevated temperatures.

    摘要翻译: 低Mn低Cr铁素体耐热钢,主要由重量%:0.02-0.20%C,高达0.7%的Si,小于0.1%的Mn,至多0.8%的Ni,0.8-3.5%的Cr,0.01- 3.0%W,0.1-0.5%V,0.01-0.20%Nb,0.001-0.05%Al,0.0005-0.05%Mg,0.0005-0.01%B,小于0.05%N,最高0.03%P,最高0.015% S,0.001-0.05%Ti,余量为Fe和杂质,其中B含量定义为满足下式(14/11)B> NN(V / 51)/ {(C / 12)+( N / 14)} -N(Nb / 93)/ {(C / 12)+(N / 14)} -N(Ti / 48)/ {C / 12)+(N / 14)}。 钢可以进一步含有0.01-1.5%的Mo,和/或一种或多种选自0.01-0.2%La,0.01-0.2%Ce,0.01-0.2%Y,0.01-0.2%Ca,0.01 -0.2%的Ta和0.01-0.2%的Zr。 钢可用于代替奥氏体钢或高Cr铁素体钢,因为它具有显着提高的韧性,可加工性和焊接性,并且在高温下具有优异的蠕变性能。

    Precipitation-hardening-type Ni-base alloy exhibiting improved corrosion
resistance
    77.
    发明授权
    Precipitation-hardening-type Ni-base alloy exhibiting improved corrosion resistance 失效
    具有改善耐腐蚀性的沉淀硬化型Ni基合金

    公开(公告)号:US5217684A

    公开(公告)日:1993-06-08

    申请号:US619980

    申请日:1990-11-30

    IPC分类号: C22C19/05

    CPC分类号: C22C19/056 C22C19/055

    摘要: A precipitation-hardening-type Ni-base alloy exhibiting improved resistance to stress corrosion cracking in a sour gas atmosphere containing elemental sulfur at high temperatures is disclosed. The alloy consists essentially of, by weight %;______________________________________ Cr: 12-25%, Mo: over 9.0 and up to 15%, Nb: 4.0-6.0%, Fe: 5.0-25%, Ni: 45-60%, C: 0.050% or less, Si: 0.50% or less, Mn: 1.0% or less, P: 0.025% or less, S: 0.0050% or less, N: 0.050% or less, Ti: 0.46-1.0%, Al: 0-2.0%. ______________________________________

    摘要翻译: 公开了一种在高温下含有元素硫的酸性气体环境中耐应力腐蚀开裂性能优异的析出硬化型Ni基合金。 合金基本上由重量%组成; -Cr:12-25%,Mo:9.0以上15%以下,-Nb:4.0-6.0%,Fe:5.0〜25%,-N:45-60%,C:0.050%以下,-Si :0.50%以下,Mn:1.0%以下,-P:0.025%以下,S:0.0050%以下,-N:0.050%以下,-Ti:0.46〜1.0%,Al:0〜2.0% 。 -