Oil for hot heat treatment of steel

Abstract

The subject of the application is an oil for hot heat treatment of steel, which contains 80.5% - 92.0% (m / m) of base oil containing I) 20.0% - 60.0% (m / m) of wax - modified lanolin having a kinematic viscosity at 40°C of 485.0 - 598.0 mm2 / s and a pour point of 2°C - 16°C and characterized by a distillation range such that less than 5% V / V distils to 458°C and at least 95% V / V distils to 645°C, II) 20.0% - 45.0% (m / m) of mineral oil having a kinematic viscosity at 40°C of 28.0 - 39.0 mm2 / s and a pour point of -8°C to -18°C and which is characterized by a distillation range such that less than 5% V / V distills to 315°C and at least 95% V / V distills to 470°C, III) 5.0 - 40.0 (m / m) of Brightstock base oil, having a kinematic viscosity at 40°C of 470.0 - 560.0 mm2 / s and a pour point of -5°C to -12°C, and which is characterized by a distillation range such that,that less than 5% V / V distils up to 440°C and at least 95% V / V distils up to 675°C and contains two packages of improvers in the amount of: a) 1.5% - 6.0% (m / m) of a package of improvers containing, calculated on the total weight of this package, 5% - 9.9% (m / m) bis(nonylphenyl)amine and 5% - 9.9% (m / m) sulphurised calcium salts and alkyl derivatives of phenols, mainly dodecylphenol and 0.5% - 0.99% (m / m) tetrapropenylphenol isomers dissolved in mineral base oil, the content of which in the package is from 30% to 60% (m / m), b) 1.5% - 8% (m / m) of a package of improvers containing, in calculated on the total weight of this package, a mixture of 70% (m / m) hydrocarbon resins with 30% (m / m) non-aromatic hydrocarbons obtained from the vacuum residue after distillation of crude oil or by separating the raffinate - oil in the process of deasphalting the vacuum residue, and additionally contains 2 refining additives with different functions, in amounts of c) 0.2% - 4,0% (m / m) of ashless dispersant, type mono- and / or bis-polybutenesuccinimides, with a base number of not more than 18 mg KOH / g and a viscosity at 100°C of not more than 330 mm2 / s, d) 0.2% - 3.0% (m / m) of viscosity modifier - polymer of esters of acrylic acid and methacrylic acid with aliphatic alcohols (C1-C18), dissolved in mineral base oil and with a viscosity of the entire mixture at 100°C in the range from 660 mm2 / s to 980 mm2 / s,