Composition of high performance bearing oil for steel plants

1. A zinc free bearing oil composition consisting of:

(a) 0.45-0.55 weight % of di-n-octyl-phosphite, tris-nonylphenyl phosphate or i-decyl-diphenyl phosphate as an ashless antiwear or an extreme pressure agent;

(b) 0.4 to 1.0 weight % of dialkyl dithiophosphate as an antiwear, extreme pressure or FZG booster;

(c) 0.15 weight % of 3-5-bis(1-1-dimethylethyl)-4-hydroxy alkyl ester or a C 7 -C 9 alkyl ester as a phenolic oxidation inhibitor;

(d) 0.3 weight % of butylated diphenylamine as an aminic oxidation inhibitor;

(e) 0.3 weight % of calcium sulphonates as a rust or a corrosion inhibitor I having a sulphonate, wherein the calcium sulphonate has a total base number is a range of 180 to 450;

(f) 0.05 to 0.50 weight % of triazole derivative as a metal passivator;

(g) 0.02 weight % of poly methacrylates as a pour point depressant;

(h) 0.02 weight % of polyacrylate as a defoament as; and

(i) 90 to 99.9 weight % of a base,

wherein the weight % being based on the total weight of the composition and

wherein the composition is zinc free and demulsifier free.

2. The composition as claimed in claim 1 , wherein the base oil is selected from the base oil of API Group I, API Group II, API Group III, API Group IV and API Group V and mixture thereof.

3. A process for preparing zinc free bearing oil composition, wherein the process comprises mixing the additives in the amount as mentioned in claim 1 in the base oil at a temperature in the range of 60° C. to 65° C.