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    • 5. 发明授权
    • Austenitic heat-resistant steel which forms Al.sub.2 O.sub.3 film in
high-temperature oxidizing atmosphere
    • 奥氏体耐热钢,在高温氧化气氛中形成Al2O3膜
    • US4204862A
    • 1980-05-27
    • US893688
    • 1978-04-05
    • Satoshi KadoTaketomo YamazakiTetsu SakamotoMikio YamanakaKotaro Yoshida
    • Satoshi KadoTaketomo YamazakiTetsu SakamotoMikio YamanakaKotaro Yoshida
    • C22C38/48C22C38/50C22C38/06
    • C22C38/50C22C38/48
    • An austenitic heat-resistant steel which forms an oxide film mainly composed of Al.sub.2 O.sub.3 in a high-temperature oxidizing atmosphere, consisting essentially of not more than 0.2% of C, not more than 1.0% of Si, not more than 2.0% of Mn, 12 to 37% of Ni, 9 to 25% of Cr, more than 4.5 but not more than 6% of Al, and at least one member selected from the group consisting of Ti, Nb and Zr in a total amount of not more than 0.8%, with the balance being Fe; the .delta.-ferrite value of this steel, calculated from the formula set forth below, is from 0 to 7.9; this steel is removed of an internal oxide layer which has been formed just below the steel surface during hot working. ##EQU1## where Wi and Mi represent, respectively, the percent by weight and the atomic weight of Ti, Nb and Zr, and when the term ##EQU2## is negative this term is regarded as zero. This steel composition may contain one or more rare earth elements such as Y, Ce and La in a total amount of not more than 0.08%.
    • 奥氏体耐热钢,其在高温氧化气氛中形成主要由Al2O3组成的氧化膜,其基本上由不超过0.2%的C,不超过1.0%的Si,不超过2.0%的Mn, Ni中的12〜37%,Cr:9〜25%,Al:4.5以上且6%以下,以及选自Ti,Nb,Zr中的至少1种以下。 0.8%,余量为Fe; 由下列公式计算的该钢的δ-铁素体值为0至7.9; 在热加工期间,该钢被除去已形成在钢表面正下方的内部氧化物层。 δ-铁素体值= 3.0 {(%Cr)+ 1.5(%Si)+ 2.5(%Al)}其中Wi和Mi分别表示Ti,Nb的重量百分比和原子量, Zr,当术语“IMAGE”为负时,该项被视为零。 这种钢组合物可以含有一种或多种稀土元素如Y,Ce和La,总量不大于0.08%。