Fe-Cr-Ni ALLOY SHEET FOR ELECTRON GUN ELECTRODE, AND Fe-Cr- Ni ALLOY FOR ELECTRON GUN ELECTRODE

摘要

PROBLEM TO BE SOLVED: To obtain an alloy which is suitable for an alloy sheet for an electron gun electrode without causing any drawing cracks even in recent more severe drawing process.;SOLUTION: This Fe-Cr-Ni alloy has a composition containing, by weight, 15 to 20% Cr, 9 to 15% Ni, ≤0.12% C, 0.005 to 1.0% Si, 0.005 to 2.5% Mn, ≤0.03% P, 0.0003 to 0.0100% S, ≤2.0% Mo, 0.001 to 0.2% Al, ≤0.005% O, ≤0.1% N, ≤0.1% Ti, ≤0.1% Nb, ≤0.1% V, ≤0.1% Zr, ≤0.05% Ca and ≤0.02% Mg, and the balance Fe with inevitable impurities. When the Fe-Cr-Ni alloy is rolled into a sheet having a thickness of 0.1 to 0.7 mm, in the surface layer, the number of inclusion groups ranged in a width of 10 to 20 μm and in a length of ≥20 μm is ≤20 pieces/mm2, and also, the number of inclusion groups ranged in a width of ≥20 μm and in a length of ≥20 μm is ≤5 pieces/mm2.;COPYRIGHT: (C)2002,JPO