Austenitic cast iron, process to develop it, austenitic cast moldings and parts of the discharge system gas

Austenitic cast iron whose main phase in the range of ordinary temperature is austenite, characterized in that the basic elements comprising C: from 1 to 5 mass%; Si: 3 to 5% by mass; Ni: 7 to 15 mass%; Mn: 0.1 to 8 mass%; Cu: 2.5 mass% or less; and Cr: 0.5 to 4 mass%; and optionally trace selected from the group consisting of Mg, rare earths, Al, Ca, Ba, Bi, Sb, Sn, Ti, Zr, Mo, V, W, Nb, and N, in a proportion of 1% modifier elements in mass or less; the balance being iron (Fe) and unavoidable impurities.