Abstract: A method for slag modification method during the end period of casting in a steel ladle having a cover is disclosed. When the slag in a steel ladle is reducing slag, before casting, air is blown into the steel ladle by means of a bottom blowing brick, then casting is started, and during the end period of casting, bottom blowing of gas is stopped, and a carrier gas is used to spray a modifier into the steel ladle until casting is completed. When the slag is oxidizing slag, during the end period of casting, the carrier gas is used to spray the modifier into the steel ladle until casting is completed. The direction in which the modifier is sprayed is towards a steel outlet of the steel ladle, the modifier being lime, light calcined dolomite, magnesium balls, or recarburizer, and the particle size of the modifier being 3-10 mm.

Abstract: The present invention provides an in-situ method for synthesizing a Ni—W—WC composite coating, which includes the following steps: immersing a carbon steel substrate to be coated in an electroplating solution and electroplating, to obtain a Ni—W—C alloy coating on the surface of the carbon steel substrate; and then subjecting the alloy coating to high temperature heat treatment to obtain the Ni—W—WC composite coating. The electroplating solution comprises the following components: a nickel salt, a tungstate, citric acid, a citrate, a recarburizer, and a wetting agent. The present invention shows merits of simple operation, high current efficiency, simple electroplating process, and is clean and causes no pollution, thus meeting the requirements of environment protection.

Abstract: The present invention provides an in-situ method for synthesizing a Ni—W—WC composite coating, which includes the following steps: immersing a carbon steel substrate to be coated in an electroplating solution and electroplating, to obtain a Ni—W—C alloy coating on the surface of the carbon steel substrate; and then subjecting the alloy coating to high temperature heat treatment to obtain the Ni—W—WC composite coating. The electroplating solution comprises the following components: a nickel salt, a tungstate, citric acid, a citrate, a recarburizer, and a wetting agent. The present invention shows merits of simple operation, high current efficiency, simple electroplating process, and is clean and causes no pollution, thus meeting the requirements of environment protection.