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    • 7. 发明公开
    • LEAN DUPLEX STAINLESS STEEL AND METHOD FOR PRODUCING SAME
    • LEAN双相不锈钢及其生产方法
    • EP3239344A1
    • 2017-11-01
    • EP15873672.8
    • 2015-12-24
    • Posco
    • CHOI, Jeom Yong
    • C22C38/58C22C38/42B22D11/16B22D11/055B22D11/124
    • B22D11/22B22D11/055B22D11/124B22D11/16C21D6/004C21D2211/001C21D2211/005C22C38/001C22C38/02C22C38/04C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
    • The present invention relates to lean duplex stainless steel having a dual-phase structure of an austenite phase and a ferrite phase, and a method for producing the lean duplex stainless steel, the lean duplex stainless steel according to one embodiment of the present invention, as a ferrite-austenite stainless steel, having the preferred stacking fault energy (SFE) value of the austenite phase, expressed by the formula 2 below, of 19-37 and critical strain value range, within which the strain-induced martensite phases occurs, of 0.1-0.25. SFE = 25.7 + 1.59 × Ni / K Ni − K Ni × V γ + V γ + 0.795 × Cu / K Cu − K Cu × V γ + V γ − 0.85 × Cr / K Cr − K Cr × V γ + V γ + 0.001 × Cr / K Cr − K Cr + V γ + V γ 2 + 38.2 × N / K N − K N × V γ + V γ 0.5 − 2.8 × Si / K Si − K Si × V γ + V γ − 1.34 × Mn / K Mn − K Mn + V γ + V γ + 0.06 × Mn / K Mn − K Mn × V γ + V γ 2 where Ni, Cu, Cr, N, Si and Mn indicate the overall content (wt.%) of the respective constituent element, and K(x) is the distribution index of respective constituent element (x) and is expressed by the formula 3 below, and V(γ) is the component ratio of austenite (in the 0.45-0.75 range). K x = amount of element x in ferrite phase / amount of element x in austenite phase
    • 本发明涉及具有奥氏体相和铁素体相的双相组织的贫双相不锈钢,以及用于生产根据本发明一个实施方案的贫双相不锈钢的方法,即,贫双相不锈钢,作为 铁素体 - 奥氏体不锈钢,其具有19-37的由下式2表示的奥氏体相的优选堆垛层错能(SFE)值和发生应变诱发马氏体相的临界应变值范围, 0.1-0.25。 SFE = 25.7 + 1.59×镍/ KNI-KNI×Vγ+Vγ+ 0.795×铜/ KCU-KCU×Vγ+Vγ-0.85×CR / KCR-KCR×Vγ+Vγ+ 0.001×CR / KCR-KCR +Vγ+ Vγ2+ 38.2×N / KN-KN×Vγ+Vγ0.5-2.8×的Si / KSI-KSI×Vγ+Vγ-1.34×的Mn / KMN-KMN +Vγ+Vγ+ 0.06×的Mn / KMN-KMN×Vγ+ Vγ2其中Ni,Cu,Cr,N,Si和Mn表示各个构成元素的总含量(重量%),K(x)是各个构成元素(x)的分布指数并由式 V(γ)是奥氏体的组分比例(在0.45-0.75范围内)。 Kx =铁素体相中元素x的量/奥氏体相中元素x的量