Oil for hardening steel at very high temperatures

Abstract

The subject of the application is an oil for very hot hardening of steel, which contains 88.5% - 94.6% (m / m) of wax - modified lanolin with a kinematic viscosity at 40°C of 485.0 - 598.0 mm2 / s and a pour point of 2°C - 16°C and which is characterized by a distillation range such that less than 5% V / V distils up to 458°C and at least 95% V / V distils up to 645°C and contains one package of refining additives in the amount of: a) 2.0% - 6.8% (m / m) of a package of refining additives containing from 10% to less than 20% (m / m) of calcium salts of long-chain alkyl derivatives of salicylic acid and from 10% to less than 20% (m / m) of a mixture of saturated sodium salts linear (C10-C47)-alkyl-aryl derivatives of petroleum-derived benzenesulfonic acids and from 1% to less than 3% (m / m) of esters of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid with alcohols having branched (C7-C9)-alkyl groups, dissolved in mineral base oil,the content of which in the package is a supplement to 100% (m / m), and additionally contains 2 refining additives with different functions, in the amounts of: b) 0.3% - 3.5% (m / m) of ashless dispersant, mono- and / or bis-polybutenesuccinimides type, 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, c) 0.8% - 4.5% (m / m) of viscosity modifier - polymer of acrylic acid and methacrylic acid esters with aliphatic alcohols (C1—C18), dissolved in mineral base oil and with a viscosity of the entire mixture at 100°C of between 660 mm2 / s and 980 mm2 / s,