Method of producing Fe-Ni series alloys having improved effect for restraining streaks during etching
AssigneeNippon Yakin Kogyo Co., Ltd.
InventorsMasaomi Tsuda, Toshihiko Taniuchi
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Abstract
A continuously cast slab of Fe-Ni series alloy comprising 30-50 wt % of Ni or further 0.001-0.03 wt % of B and the balance of Fe is controlled to an eqiaxial crystal ratio of 20% or 30% in accordance with the existence or nonexistence of B content in the continuous casting and, if necessary, subjected to an electromagnetic stirring treatment or the like for controlling the eqiaxial crystal ratio and then heated at a temperature of not lower than 950.degree. C., 1000.degree. C. and 1100.degree. C. to economically produce Fe-Ni series alloys having improved effect for restraining streaks during etching.
Claims5
A method of producing Fe-Ni series alloys for use in a shadow mask for a cathode tube, having an improved effect of restraining streaks during etching, which comprises continuously casting a molten metal of Fe-Ni series alloy consisting essentially of 30-50 wt % of Ni, 0.001-0.03 wt % of B and the balance being substantially Fe to form a continuously cast slab having not more than a 20% equiaxial crystal structure, and then heating the resulting continuously cast slab at a temperature of not lower than 1000.degree. C. for not less than 1 hour.
A method of producing Fe-Ni series alloys for use in a shadow mask for a cathode tube, having an improved effect of restraining streaks during etching, which comprises continuously casting a molten metal of Fe-Ni series alloy consisting essentially of 30-50 wt % of Ni, 0.001-0.03 wt % of B and the balance being substantially Fe to form a continuously cast slab having more than a 20% equiaxial crystal structure, and then heating the resulting continuously cast slab at a temperature of not lower than 1000.degree. C. for not less than 1 hour.
Dependencies are inferred from the claim text.