TWO-PHASE STAINLESS STEEL WIRE FOR PRESTRESSED CONCRETE TENDON, TWO-PHASE STAINLESS STEEL WIRE, AND PRESTRESSED CONCRETE TENDON

• Main Authors: IMAI AKIFUMI, YOSHIMURA KOICHI, YOKOMATSU HIDESATO, TENTO MASAYUKI, TADOKORO YUTAKA, SUGANO NORITO
• Format: Patent
• Language: English; Japanese
• Published: 25.07.2019
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide a two-phase stainless steel wire having high strength, high in elongation, excellent in stress corrosion crack resistance, and capable of being used as a prestressed concrete tendon.SOLUTION: There is adopted a two-phase stainless steel wire containing C, Si, Mn, Ni, Cr, Mo, N, Cu and the balance iron with impurities, and having a Mdvalue represented by the (2) formula in a range of 0°C to 90°C, tensile strength of 1550 MPa or more, and elongation of 1.6% or more. Md(°C)=551-462(C+N)-9.2Si-8.1Mn-13.7Cr-29(Ni+Cu)-18.5Mo-68Nb (2), wherein element symbols are contents of each element (mass%) and element which is not included is substituted by 0 mass%.SELECTED DRAWING: None 【課題】高強度で伸び率が高く、かつ、耐応力腐食割れ性に優れ、プレストレストコンクリートの緊張材として使用可能な二相ステンレス鋼線を提供する。【解決手段】Ｃ、Ｓｉ、Ｍｎ、Ｎｉ、Ｃｒ、Ｍｏ、Ｎ、Ｃｕを含有し、残部が鉄及び不純物からなり、（２）式で表されるＭｄ３０値が０℃以上９０℃以下の範囲であり、引張強さが１５５０ＭＰａ以上であり、伸び率が１．６％以上である二相ステンレス鋼線を採用する。Ｍｄ３０（℃）＝５５１−４６２（Ｃ＋Ｎ）−９．２Ｓｉ−８．１Ｍｎ−１３．７Ｃｒ−２９（Ｎｉ＋Ｃｕ）−１８．５Ｍｏ−６８Ｎｂ ... （２）ただし、（２）式における元素記号は各元素の含有量（質量％）であり、含有しない元素は０質量％を代入する。【選択図】なし