Steel sheet for porcelain enamel excellent in forming property, aging property and enameling characteristics and method for producing the same

Abstract

Disclosed is the provision of a non-aging, highly anti-seed and anti-black-speck steel plate for enameling without relying upon decarbonization-denitrification annealing involving increased production cost, and without the addition of expensive elements, such as niobium and titanium involving increased alloying cost. This steel plate is produced by adopting a steel composition comprising, by weight, carbon: not more than 0.0018%, silicon: not more than 0.020%, manganese: 0.10 to 0.30%, phosphorus: 0.010 to 0.030%, sulfur: not more than 0.030%, aluminum: not more than 0.005%, nitrogen: 0.0008 to 0.0050%, boron: not more than 0.0050% and not less than 0.6 time the nitrogen content, and oxygen: 0.010 to 0.05%, and regulating the chemical composition of the steel and regulating mainly hot rolling conditions to regulate the form of nitrides.

Description

technical field [0001] The present invention relates to a steel sheet for enameling that can be obtained at low cost and has excellent workability, timeliness, and enameling properties, and a method for producing the same. Background technique [0002] In the past, steel sheets for enamelling were produced by decarburization and denitrogenation annealing, thereby reducing the carbon and nitrogen contents to several 10 ppm or less. However, such decarburization and denitrogenation annealing has disadvantages of low productivity and high production cost. [0003] In order to avoid decarburization and denitrogenation annealing, for example, in Japanese Patent Application Publication No. 122938 / 1994 and Japanese Patent 2951241, it is disclosed that ultra-low carbon steel is used to form a steel plate for enamelling, wherein the carbon content is reduced to several 10ppm by degassing during steelmaking . In these technologies, in order to eliminate the adverse effects of a very...

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Problems solved by technology

[0006] However, according to the method described in the publication, the reduction of solid solution carbon is not sufficient according to the change of manufacturing conditions, and the increase of nitrogen caused by the redissolution of nitrides during annealing causes aging deterioration and thus adversely affects press workability

At the same time, since the gas is generated due to the decomposition of nitrides, etc. during enamel firing, there is a problem that seeds are easily generated and black spot defects occur.

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