Chromium-based two-phase alloy and product using said two-phase alloy

A Cr-based two-phase alloy comprising two phases of a ferrite phase and an austenite phase that are mixed with each other, wherein

• a chemical composition of the Cr-based two-phase alloy consists of a main component, an auxiliary component, impurities, a first optional auxiliary component, and a second optional auxiliary component,
• the main component consists of 33% by mass or more to 61% by mass or less of Cr, 18% by mass or more to 40% by mass or less of Ni, and 10% by mass or more to 33% by mass or less of Fe, and a total content of the Ni and the Fe is 37% by mass or more to 65% by mass or less,
• the auxiliary component consists of 0.1% by mass or more to 2% by mass or less of Mn, 0.1% by mass or more to 1% by mass or less of Si, 0.005% by mass or more to 0.05% by mass or less of Al, and 0.02% by mass or more to 0.3% by mass or less of Sn, and
• the impurities contain more than 0% by mass to 0.04% by mass or less of P, more than 0% by mass to 0.01% by mass or less of S, more than 0% by mass to 0.03% by mass or less of C, more than 0% by mass to 0.04% by mass or less of N, and more than 0% by mass to 0.05% by mass or less of O.