The present invention relates to the field of lubricant, and specifically provides a lubricant composition and its preparation method and use. The lubricant composition comprises a base oil and rubber particles having radiation crosslinked structure dispersed therein, wherein the base oil is continuous phase and the rubber particles are dispersed phase. The viscosity of the lubricant composition of the present invention can be effectively adjusted as temperature changes. As compared with the lubricant composition comprising chemically crosslinked rubber particles, it has a lower viscosity at low temperatures and a higher viscosity at high temperatures, and has a relatively high viscosity index, which can meet the application requirements at the temperature above 200? C. In addition, the lubricant composition of the present invention also has excellent antiwear and friction-reducing properties.

A galvanized steel sheet to be subjected to complicated and difficult press forming is provided. A method for producing such a galvanized steel sheet is also provided. On a surface of a galvanized steel sheet having a metallic zinc layer with a coating weight of 5 g/m.sup.2 or more, a film is formed that contains 10 mass % or more of a polyolefin wax having a melting point of 120 C. or above and 140 C. or below and an average particle size of 3.0 m or less, and at least one organic resin selected from acrylic resins, epoxy resins, urethane resins, phenolic resins, vinyl acetate resins, and polyester resins, in such a way that the coating weight W (g/m.sup.2) of the film per side and the arithmetic average roughness Ra (m) of the surface of the metallic zinc layer satisfy a relationship of W0.12Ra.sup.2+0.1.

A threaded tubular component configured for drilling or working hydrocarbon wells, the tubular component including, at one of its ends, a threaded zone formed on its external or internal peripheral surface depending on whether the threaded end is male or female in type. The end portion is at least partially coated with a dry film, including a thermoplastic or thermoset matrix including microcapsules filled with compounds in liquid form.