IRON-NICKEL ALLOY FOR SHADOW MASK, FREE FROM SCAB

PROBLEM TO BE SOLVED: To prevent the occurrence of scab at the time of hot rolling of a continuously cast slab by incorporating specific amounts of Cr and also S in the amount not higher than a specific value and capable of regulating Mn/S to a specific value of below into an Fe-Ni alloy. SOLUTION: This Fe-Ni alloy for shadow mask has a composition containing, by weight, 30-45% Ni, 0.21-1.0% Cr, and =100. Cr is effective in the prevention of the occurrence of intergranular oxidation which is the main cause of scab. As to Cr content, when it exceeds 0.2%, the intergranular oxidation of slab is remarkably improved, but simultaneously, the coefficient of thermal expansion is increased, thus color slippage is brought about when Cr content exceeds 1.0%. When Mn/S is less then 100, hot ductility is markedly decreased at 1200-900 deg.C in the hot rolling temp. region. When S content exceeds 0.004%, the inhibition of deterioration in hot ductility becomes difficult even if Mn/S>=100 is satisfied. Further, it is desirable to regulate Mn content to