Two-component anti-seizure agent for hot metal working process, and method of manufacturing seamless pipe using thereof
View Patent ↗The present invention provide a two-component anti-seizure agent for hot metal working process comprising the first aqueous solution and the second aqueous solution, wherein the first aqueous solution contains 10˜30 mass % of sodium silicate equivalent to anhydride to 100 mass % of total mass of the first aqueous solution, and the second aqueous solution contains at least one kind selected from a group consisting of: an organic acid and water-soluble amine salts thereof, an inorganic acid and water-soluble amine salts thereof, a water-soluble amine, a water-soluble alcohol, and a water-soluble metal chloride. When the two-component anti-seizure agent is applied onto disk-roll type guide shoes, it can be provided and maintained on the circumferential surface of the disk-roll type guide shoes without washed away by rolls' cooling water. Thereby, the anti-seizure agent does not adhere to rolls and the rolls and a pipe material do not cause slippage each other. Thus, it is capable to carry out piercing-rolling of the pipe material.
1. A method of manufacturing seamless pipe using piercing-rolling mill having disk-roll type guide shoes, the method comprising the steps of:
a first process for applying, in a process of piercing-rolling, a first aqueous solution to a circumferential surface of said disk-roll type guide shoes, and
a second process for applying a second aqueous solution to said circumferential surface of said disk-roll type guide shoes to form a water-proof coating on said circumferential surface in the process of piercing-rolling by gelling of the first aqueous solution,
wherein said first aqueous solution contains 10˜30 mass % of sodium silicate equivalent to anhydride to total mass of said first aqueous solution as 100 mass %, and
said second aqueous solution contains at least one kind of component(s) selected from a group consisting of acetic acid, oxalic acid, adipic acid, tartaric acid, hydrochloric acid, phosphoric acid, boric acid, monoethanol amine, N-methyl diethanol amine, methyl alcohol, iron chloride, magnesium chloride, and basic aluminum chloride, and further wherein
said first aqueous solution is substantially free from said acetic acid, oxalic acid, adipic acid, tartaric acid, hydrochloric acid, phosphoric acid, boric acid, monoethanol amine, N-methyl diethanol amine, methyl alcohol, iron chloride, magnesium chloride, and basic aluminum chloride included in said second aqueous solution,
said second aqueous solution is substantially free from said sodium silicate included in said first aqueous solution and substantially free from organic acids of which total acid number is 500 mgKOH/g or less, and
a total concentration of said component(s) in said second aqueous solution is 10-72 mass % based on a total mass of said second solution.
2. The method of manufacturing seamless pipe according to claim 1 , wherein said first aqueous solution contains 10˜30 mass % of sodium silicate equivalent to anhydride, 10˜60 mass % of iron oxide, 0˜5 mass % of modified starch, and 0˜1 mass % of shear-rate dependent viscosity reducer, to total mass of said first aqueous solution as 100 mass %.
3. The method of manufacturing seamless pipe according to claim 2 , wherein said shear-rate dependent viscosity reducer is a xanthan gum.